Commit message: Fix PSK handling.

The PSK identity hint should be stored in the SSL_SESSION structure
and not in the parent context (which will overwrite values used
by other SSL structures with the same SSL_CTX).

Use BUF_strndup when copying identity as it may not be null terminated.

Reviewed-by: Tim Hudson <tjh@openssl.org>
CVE: CVE-2015-3196
CWE: CWE-362
Vulnerability description: ssl/s3_clnt.c in OpenSSL 1.0.0 before 1.0.0t, 1.0.1 before 1.0.1p, and 1.0.2 before 1.0.2d, when used for a multi-threaded client, writes the PSK identity hint to an incorrect data structure, which allows remote servers to cause a denial of service (race condition and double free) via a crafted ServerKeyExchange message.

Project: openssl

static int ca_dn_cmp(const X509_NAME *const *a, const X509_NAME *const *b)
{
    return (X509_NAME_cmp(*a, *b));
}

Project: openssl

static DH *get_server_static_dh_key(SESS_CERT *scert)
{
    DH *dh_srvr = NULL;
    EVP_PKEY *spkey = NULL;
    int idx = scert->peer_cert_type;

    if (idx >= 0)
        spkey = X509_get_pubkey(scert->peer_pkeys[idx].x509);
    if (spkey) {
        dh_srvr = EVP_PKEY_get1_DH(spkey);
        EVP_PKEY_free(spkey);
    }
    if (dh_srvr == NULL)
        SSLerr(SSL_F_GET_SERVER_STATIC_DH_KEY, ERR_R_INTERNAL_ERROR);
    return dh_srvr;
}

Project: openssl

int ssl3_check_cert_and_algorithm(SSL *s)
{
    int i, idx;
    long alg_k, alg_a;
    EVP_PKEY *pkey = NULL;
    int pkey_bits;
    SESS_CERT *sc;
#ifndef OPENSSL_NO_RSA
    RSA *rsa;
#endif
#ifndef OPENSSL_NO_DH
    DH *dh;
#endif
    int al = SSL_AD_HANDSHAKE_FAILURE;

    alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
    alg_a = s->s3->tmp.new_cipher->algorithm_auth;

    /* we don't have a certificate */
    if ((alg_a & (SSL_aNULL | SSL_aKRB5)) || (alg_k & SSL_kPSK))
        return (1);

    sc = s->session->sess_cert;
    if (sc == NULL) {
        SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, ERR_R_INTERNAL_ERROR);
        goto err;
    }
#ifndef OPENSSL_NO_RSA
    rsa = s->session->sess_cert->peer_rsa_tmp;
#endif
#ifndef OPENSSL_NO_DH
    dh = s->session->sess_cert->peer_dh_tmp;
#endif

    /* This is the passed certificate */

    idx = sc->peer_cert_type;
#ifndef OPENSSL_NO_ECDH
    if (idx == SSL_PKEY_ECC) {
        if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509, s) == 0) {
            /* check failed */
            SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_BAD_ECC_CERT);
            goto f_err;
        } else {
            return 1;
        }
    } else if (alg_a & SSL_aECDSA) {
        SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
               SSL_R_MISSING_ECDSA_SIGNING_CERT);
        goto f_err;
    } else if (alg_k & (SSL_kECDHr | SSL_kECDHe)) {
        SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_MISSING_ECDH_CERT);
        goto f_err;
    }
#endif
    pkey = X509_get_pubkey(sc->peer_pkeys[idx].x509);
    pkey_bits = EVP_PKEY_bits(pkey);
    i = X509_certificate_type(sc->peer_pkeys[idx].x509, pkey);
    EVP_PKEY_free(pkey);

    /* Check that we have a certificate if we require one */
    if ((alg_a & SSL_aRSA) && !has_bits(i, EVP_PK_RSA | EVP_PKT_SIGN)) {
        SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
               SSL_R_MISSING_RSA_SIGNING_CERT);
        goto f_err;
    }
#ifndef OPENSSL_NO_DSA
    else if ((alg_a & SSL_aDSS) && !has_bits(i, EVP_PK_DSA | EVP_PKT_SIGN)) {
        SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
               SSL_R_MISSING_DSA_SIGNING_CERT);
        goto f_err;
    }
#endif
#ifndef OPENSSL_NO_RSA
    if (alg_k & SSL_kRSA) {
        if (!SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
            !has_bits(i, EVP_PK_RSA | EVP_PKT_ENC)) {
            SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
                   SSL_R_MISSING_RSA_ENCRYPTING_CERT);
            goto f_err;
        } else if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)) {
            if (pkey_bits <= SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) {
                if (!has_bits(i, EVP_PK_RSA | EVP_PKT_ENC)) {
                    SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
                           SSL_R_MISSING_RSA_ENCRYPTING_CERT);
                    goto f_err;
                }
                if (rsa != NULL) {
                    /* server key exchange is not allowed. */
                    al = SSL_AD_INTERNAL_ERROR;
                    SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, ERR_R_INTERNAL_ERROR);
                    goto f_err;
                }
            }
        }
    }
#endif
#ifndef OPENSSL_NO_DH
    if ((alg_k & SSL_kEDH) && dh == NULL) {
        al = SSL_AD_INTERNAL_ERROR;
        SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, ERR_R_INTERNAL_ERROR);
        goto f_err;
    }
    if ((alg_k & SSL_kDHr) && !SSL_USE_SIGALGS(s) &&
               !has_bits(i, EVP_PK_DH | EVP_PKS_RSA)) {
        SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
               SSL_R_MISSING_DH_RSA_CERT);
        goto f_err;
    }
# ifndef OPENSSL_NO_DSA
    if ((alg_k & SSL_kDHd) && !SSL_USE_SIGALGS(s) &&
        !has_bits(i, EVP_PK_DH | EVP_PKS_DSA)) {
        SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
               SSL_R_MISSING_DH_DSA_CERT);
        goto f_err;
    }
# endif

    if (alg_k & (SSL_kDHE | SSL_kDHr | SSL_kDHd)) {
        int dh_size;
        if (alg_k & SSL_kDHE) {
            dh_size = BN_num_bits(dh->p);
        } else {
            DH *dh_srvr = get_server_static_dh_key(sc);
            if (dh_srvr == NULL)
                goto f_err;
            dh_size = BN_num_bits(dh_srvr->p);
            DH_free(dh_srvr);
        }

        if ((!SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && dh_size < 768)
            || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && dh_size < 512)) {
            SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_DH_KEY_TOO_SMALL);
            goto f_err;
        }
    }
#endif  /* !OPENSSL_NO_DH */

    if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
        pkey_bits > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) {
#ifndef OPENSSL_NO_RSA
        if (alg_k & SSL_kRSA) {
            if (rsa == NULL) {
                SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
                       SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
                goto f_err;
            } else if (BN_num_bits(rsa->n) >
                SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) {
                /* We have a temporary RSA key but it's too large. */
                al = SSL_AD_EXPORT_RESTRICTION;
                SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
                       SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
                goto f_err;
            }
        } else
#endif
#ifndef OPENSSL_NO_DH
        if (alg_k & SSL_kDHE) {
            if (BN_num_bits(dh->p) >
                SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) {
                /* We have a temporary DH key but it's too large. */
                al = SSL_AD_EXPORT_RESTRICTION;
                SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
                       SSL_R_MISSING_EXPORT_TMP_DH_KEY);
                goto f_err;
            }
        } else if (alg_k & (SSL_kDHr | SSL_kDHd)) {
            /* The cert should have had an export DH key. */
            al = SSL_AD_EXPORT_RESTRICTION;
            SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
                   SSL_R_MISSING_EXPORT_TMP_DH_KEY);
                goto f_err;
        } else
#endif
        {
            SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
                   SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
            goto f_err;
        }
    }
    return (1);
 f_err:
    ssl3_send_alert(s, SSL3_AL_FATAL, al);
 err:
    return (0);
}

Project: openssl

static int ssl3_check_client_certificate(SSL *s)
{
    unsigned long alg_k;
    if (!s->cert || !s->cert->key->x509 || !s->cert->key->privatekey)
        return 0;
    /* If no suitable signature algorithm can't use certificate */
    if (SSL_USE_SIGALGS(s) && !s->cert->key->digest)
        return 0;
    /*
     * If strict mode check suitability of chain before using it. This also
     * adjusts suite B digest if necessary.
     */
    if (s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT &&
        !tls1_check_chain(s, NULL, NULL, NULL, -2))
        return 0;
    alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
    /* See if we can use client certificate for fixed DH */
    if (alg_k & (SSL_kDHr | SSL_kDHd)) {
        SESS_CERT *scert = s->session->sess_cert;
        int i = scert->peer_cert_type;
        EVP_PKEY *clkey = NULL, *spkey = NULL;
        clkey = s->cert->key->privatekey;
        /* If client key not DH assume it can be used */
        if (EVP_PKEY_id(clkey) != EVP_PKEY_DH)
            return 1;
        if (i >= 0)
            spkey = X509_get_pubkey(scert->peer_pkeys[i].x509);
        if (spkey) {
            /* Compare server and client parameters */
            i = EVP_PKEY_cmp_parameters(clkey, spkey);
            EVP_PKEY_free(spkey);
            if (i != 1)
                return 0;
        }
        s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
    }
    return 1;
}

Project: openssl

int ssl3_client_hello(SSL *s)
{
    unsigned char *buf;
    unsigned char *p, *d;
    int i;
    unsigned long l;
    int al = 0;
#ifndef OPENSSL_NO_COMP
    int j;
    SSL_COMP *comp;
#endif

    buf = (unsigned char *)s->init_buf->data;
    if (s->state == SSL3_ST_CW_CLNT_HELLO_A) {
        SSL_SESSION *sess = s->session;
        if ((sess == NULL) || (sess->ssl_version != s->version) ||
#ifdef OPENSSL_NO_TLSEXT
            !sess->session_id_length ||
#else
            /*
             * In the case of EAP-FAST, we can have a pre-shared
             * "ticket" without a session ID.
             */
            (!sess->session_id_length && !sess->tlsext_tick) ||
#endif
            (sess->not_resumable)) {
            if (!ssl_get_new_session(s, 0))
                goto err;
        }
        if (s->method->version == DTLS_ANY_VERSION) {
            /* Determine which DTLS version to use */
            int options = s->options;
            /* If DTLS 1.2 disabled correct the version number */
            if (options & SSL_OP_NO_DTLSv1_2) {
                if (tls1_suiteb(s)) {
                    SSLerr(SSL_F_SSL3_CLIENT_HELLO,
                           SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
                    goto err;
                }
                /*
                 * Disabling all versions is silly: return an error.
                 */
                if (options & SSL_OP_NO_DTLSv1) {
                    SSLerr(SSL_F_SSL3_CLIENT_HELLO, SSL_R_WRONG_SSL_VERSION);
                    goto err;
                }
                /*
                 * Update method so we don't use any DTLS 1.2 features.
                 */
                s->method = DTLSv1_client_method();
                s->version = DTLS1_VERSION;
            } else {
                /*
                 * We only support one version: update method
                 */
                if (options & SSL_OP_NO_DTLSv1)
                    s->method = DTLSv1_2_client_method();
                s->version = DTLS1_2_VERSION;
            }
            s->client_version = s->version;
        }
        /* else use the pre-loaded session */

        p = s->s3->client_random;

        /*
         * for DTLS if client_random is initialized, reuse it, we are
         * required to use same upon reply to HelloVerify
         */
        if (SSL_IS_DTLS(s)) {
            size_t idx;
            i = 1;
            for (idx = 0; idx < sizeof(s->s3->client_random); idx++) {
                if (p[idx]) {
                    i = 0;
                    break;
                }
            }
        } else
            i = 1;

        if (i && ssl_fill_hello_random(s, 0, p,
                                       sizeof(s->s3->client_random)) <= 0)
            goto err;

        /* Do the message type and length last */
        d = p = ssl_handshake_start(s);

        /*-
         * version indicates the negotiated version: for example from
         * an SSLv2/v3 compatible client hello). The client_version
         * field is the maximum version we permit and it is also
         * used in RSA encrypted premaster secrets. Some servers can
         * choke if we initially report a higher version then
         * renegotiate to a lower one in the premaster secret. This
         * didn't happen with TLS 1.0 as most servers supported it
         * but it can with TLS 1.1 or later if the server only supports
         * 1.0.
         *
         * Possible scenario with previous logic:
         *      1. Client hello indicates TLS 1.2
         *      2. Server hello says TLS 1.0
         *      3. RSA encrypted premaster secret uses 1.2.
         *      4. Handhaked proceeds using TLS 1.0.
         *      5. Server sends hello request to renegotiate.
         *      6. Client hello indicates TLS v1.0 as we now
         *         know that is maximum server supports.
         *      7. Server chokes on RSA encrypted premaster secret
         *         containing version 1.0.
         *
         * For interoperability it should be OK to always use the
         * maximum version we support in client hello and then rely
         * on the checking of version to ensure the servers isn't
         * being inconsistent: for example initially negotiating with
         * TLS 1.0 and renegotiating with TLS 1.2. We do this by using
         * client_version in client hello and not resetting it to
         * the negotiated version.
         */
#if 0
        *(p++) = s->version >> 8;
        *(p++) = s->version & 0xff;
        s->client_version = s->version;
#else
        *(p++) = s->client_version >> 8;
        *(p++) = s->client_version & 0xff;
#endif

        /* Random stuff */
        memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE);
        p += SSL3_RANDOM_SIZE;

        /* Session ID */
        if (s->new_session)
            i = 0;
        else
            i = s->session->session_id_length;
        *(p++) = i;
        if (i != 0) {
            if (i > (int)sizeof(s->session->session_id)) {
                SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
                goto err;
            }
            memcpy(p, s->session->session_id, i);
            p += i;
        }

        /* cookie stuff for DTLS */
        if (SSL_IS_DTLS(s)) {
            if (s->d1->cookie_len > sizeof(s->d1->cookie)) {
                SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
                goto err;
            }
            *(p++) = s->d1->cookie_len;
            memcpy(p, s->d1->cookie, s->d1->cookie_len);
            p += s->d1->cookie_len;
        }

        /* Ciphers supported */
        i = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), &(p[2]), 0);
        if (i == 0) {
            SSLerr(SSL_F_SSL3_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE);
            goto err;
        }
#ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
        /*
         * Some servers hang if client hello > 256 bytes as hack workaround
         * chop number of supported ciphers to keep it well below this if we
         * use TLS v1.2
         */
        if (TLS1_get_version(s) >= TLS1_2_VERSION
            && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH)
            i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
#endif
        s2n(i, p);
        p += i;

        /* COMPRESSION */
#ifdef OPENSSL_NO_COMP
        *(p++) = 1;
#else

        if ((s->options & SSL_OP_NO_COMPRESSION)
            || !s->ctx->comp_methods)
            j = 0;
        else
            j = sk_SSL_COMP_num(s->ctx->comp_methods);
        *(p++) = 1 + j;
        for (i = 0; i < j; i++) {
            comp = sk_SSL_COMP_value(s->ctx->comp_methods, i);
            *(p++) = comp->id;
        }
#endif
        *(p++) = 0;             /* Add the NULL method */

#ifndef OPENSSL_NO_TLSEXT
        /* TLS extensions */
        if (ssl_prepare_clienthello_tlsext(s) <= 0) {
            SSLerr(SSL_F_SSL3_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
            goto err;
        }
        if ((p =
             ssl_add_clienthello_tlsext(s, p, buf + SSL3_RT_MAX_PLAIN_LENGTH,
                                        &al)) == NULL) {
            ssl3_send_alert(s, SSL3_AL_FATAL, al);
            SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
            goto err;
        }
#endif

        l = p - d;
        ssl_set_handshake_header(s, SSL3_MT_CLIENT_HELLO, l);
        s->state = SSL3_ST_CW_CLNT_HELLO_B;
    }

    /* SSL3_ST_CW_CLNT_HELLO_B */
    return ssl_do_write(s);
 err:
    s->state = SSL_ST_ERR;
    return (-1);
}

Project: openssl

int ssl3_get_cert_status(SSL *s)
{
    int ok, al;
    unsigned long resplen, n;
    const unsigned char *p;

    n = s->method->ssl_get_message(s,
                                   SSL3_ST_CR_CERT_STATUS_A,
                                   SSL3_ST_CR_CERT_STATUS_B,
                                   SSL3_MT_CERTIFICATE_STATUS, 16384, &ok);

    if (!ok)
        return ((int)n);
    if (n < 4) {
        /* need at least status type + length */
        al = SSL_AD_DECODE_ERROR;
        SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_LENGTH_MISMATCH);
        goto f_err;
    }
    p = (unsigned char *)s->init_msg;
    if (*p++ != TLSEXT_STATUSTYPE_ocsp) {
        al = SSL_AD_DECODE_ERROR;
        SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_UNSUPPORTED_STATUS_TYPE);
        goto f_err;
    }
    n2l3(p, resplen);
    if (resplen + 4 != n) {
        al = SSL_AD_DECODE_ERROR;
        SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_LENGTH_MISMATCH);
        goto f_err;
    }
    if (s->tlsext_ocsp_resp)
        OPENSSL_free(s->tlsext_ocsp_resp);
    s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
    if (!s->tlsext_ocsp_resp) {
        al = SSL_AD_INTERNAL_ERROR;
        SSLerr(SSL_F_SSL3_GET_CERT_STATUS, ERR_R_MALLOC_FAILURE);
        goto f_err;
    }
    s->tlsext_ocsp_resplen = resplen;
    if (s->ctx->tlsext_status_cb) {
        int ret;
        ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
        if (ret == 0) {
            al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
            SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_INVALID_STATUS_RESPONSE);
            goto f_err;
        }
        if (ret < 0) {
            al = SSL_AD_INTERNAL_ERROR;
            SSLerr(SSL_F_SSL3_GET_CERT_STATUS, ERR_R_MALLOC_FAILURE);
            goto f_err;
        }
    }
    return 1;
 f_err:
    ssl3_send_alert(s, SSL3_AL_FATAL, al);
    s->state = SSL_ST_ERR;
    return (-1);
}

Project: openssl

int ssl3_get_certificate_request(SSL *s)
{
    int ok, ret = 0;
    unsigned long n, nc, l;
    unsigned int llen, ctype_num, i;
    X509_NAME *xn = NULL;
    const unsigned char *p, *q;
    unsigned char *d;
    STACK_OF(X509_NAME) *ca_sk = NULL;

    n = s->method->ssl_get_message(s,
                                   SSL3_ST_CR_CERT_REQ_A,
                                   SSL3_ST_CR_CERT_REQ_B,
                                   -1, s->max_cert_list, &ok);

    if (!ok)
        return ((int)n);

    s->s3->tmp.cert_req = 0;

    if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE) {
        s->s3->tmp.reuse_message = 1;
        /*
         * If we get here we don't need any cached handshake records as we
         * wont be doing client auth.
         */
        if (s->s3->handshake_buffer) {
            if (!ssl3_digest_cached_records(s))
                goto err;
        }
        return (1);
    }

    if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST) {
        ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
        SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, SSL_R_WRONG_MESSAGE_TYPE);
        goto err;
    }

    /* TLS does not like anon-DH with client cert */
    if (s->version > SSL3_VERSION) {
        if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) {
            ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
            SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
                   SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
            goto err;
        }
    }

    p = d = (unsigned char *)s->init_msg;

    if ((ca_sk = sk_X509_NAME_new(ca_dn_cmp)) == NULL) {
        SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE);
        goto err;
    }

    /* get the certificate types */
    ctype_num = *(p++);
    if (s->cert->ctypes) {
        OPENSSL_free(s->cert->ctypes);
        s->cert->ctypes = NULL;
    }
    if (ctype_num > SSL3_CT_NUMBER) {
        /* If we exceed static buffer copy all to cert structure */
        s->cert->ctypes = OPENSSL_malloc(ctype_num);
        memcpy(s->cert->ctypes, p, ctype_num);
        s->cert->ctype_num = (size_t)ctype_num;
        ctype_num = SSL3_CT_NUMBER;
    }
    for (i = 0; i < ctype_num; i++)
        s->s3->tmp.ctype[i] = p[i];
    p += p[-1];
    if (SSL_USE_SIGALGS(s)) {
        n2s(p, llen);
        /*
         * Check we have enough room for signature algorithms and following
         * length value.
         */
        if ((unsigned long)(p - d + llen + 2) > n) {
            ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
            SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
                   SSL_R_DATA_LENGTH_TOO_LONG);
            goto err;
        }
        /* Clear certificate digests and validity flags */
        for (i = 0; i < SSL_PKEY_NUM; i++) {
            s->cert->pkeys[i].digest = NULL;
            s->cert->pkeys[i].valid_flags = 0;
        }
        if ((llen & 1) || !tls1_save_sigalgs(s, p, llen)) {
            ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
            SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
                   SSL_R_SIGNATURE_ALGORITHMS_ERROR);
            goto err;
        }
        if (!tls1_process_sigalgs(s)) {
            ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
            SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE);
            goto err;
        }
        p += llen;
    }

    /* get the CA RDNs */
    n2s(p, llen);
#if 0
    {
        FILE *out;
        out = fopen("/tmp/vsign.der", "w");
        fwrite(p, 1, llen, out);
        fclose(out);
    }
#endif

    if ((unsigned long)(p - d + llen) != n) {
        ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
        SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, SSL_R_LENGTH_MISMATCH);
        goto err;
    }

    for (nc = 0; nc < llen;) {
        n2s(p, l);
        if ((l + nc + 2) > llen) {
            if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
                goto cont;      /* netscape bugs */
            ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
            SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, SSL_R_CA_DN_TOO_LONG);
            goto err;
        }

        q = p;

        if ((xn = d2i_X509_NAME(NULL, &q, l)) == NULL) {
            /* If netscape tolerance is on, ignore errors */
            if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
                goto cont;
            else {
                ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
                SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_ASN1_LIB);
                goto err;
            }
        }

        if (q != (p + l)) {
            ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
            SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
                   SSL_R_CA_DN_LENGTH_MISMATCH);
            goto err;
        }
        if (!sk_X509_NAME_push(ca_sk, xn)) {
            SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE);
            goto err;
        }

        p += l;
        nc += l + 2;
    }

    if (0) {
 cont:
        ERR_clear_error();
    }

    /* we should setup a certificate to return.... */
    s->s3->tmp.cert_req = 1;
    s->s3->tmp.ctype_num = ctype_num;
    if (s->s3->tmp.ca_names != NULL)
        sk_X509_NAME_pop_free(s->s3->tmp.ca_names, X509_NAME_free);
    s->s3->tmp.ca_names = ca_sk;
    ca_sk = NULL;

    ret = 1;
    goto done;
 err:
    s->state = SSL_ST_ERR;
 done:
    if (ca_sk != NULL)
        sk_X509_NAME_pop_free(ca_sk, X509_NAME_free);
    return (ret);
}

Project: openssl

static const SSL_METHOD *ssl3_get_client_method(int ver)
{
    if (ver == SSL3_VERSION)
        return (SSLv3_client_method());
    else
        return (NULL);
}

Project: openssl

int ssl3_accept(SSL *s)
{
    BUF_MEM *buf;
    unsigned long alg_k, Time = (unsigned long)time(NULL);
    void (*cb) (const SSL *ssl, int type, int val) = NULL;
    int ret = -1;
    int new_state, state, skip = 0;

    RAND_add(&Time, sizeof(Time), 0);
    ERR_clear_error();
    clear_sys_error();

    if (s->info_callback != NULL)
        cb = s->info_callback;
    else if (s->ctx->info_callback != NULL)
        cb = s->ctx->info_callback;

    /* init things to blank */
    s->in_handshake++;
    if (!SSL_in_init(s) || SSL_in_before(s))
        SSL_clear(s);

    if (s->cert == NULL) {
        SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_NO_CERTIFICATE_SET);
        return (-1);
    }
#ifndef OPENSSL_NO_HEARTBEATS
    /*
     * If we're awaiting a HeartbeatResponse, pretend we already got and
     * don't await it anymore, because Heartbeats don't make sense during
     * handshakes anyway.
     */
    if (s->tlsext_hb_pending) {
        s->tlsext_hb_pending = 0;
        s->tlsext_hb_seq++;
    }
#endif

    for (;;) {
        state = s->state;

        switch (s->state) {
        case SSL_ST_RENEGOTIATE:
            s->renegotiate = 1;
            /* s->state=SSL_ST_ACCEPT; */

        case SSL_ST_BEFORE:
        case SSL_ST_ACCEPT:
        case SSL_ST_BEFORE | SSL_ST_ACCEPT:
        case SSL_ST_OK | SSL_ST_ACCEPT:

            s->server = 1;
            if (cb != NULL)
                cb(s, SSL_CB_HANDSHAKE_START, 1);

            if ((s->version >> 8) != 3) {
                SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
                s->state = SSL_ST_ERR;
                return -1;
            }
            s->type = SSL_ST_ACCEPT;

            if (s->init_buf == NULL) {
                if ((buf = BUF_MEM_new()) == NULL) {
                    ret = -1;
                    s->state = SSL_ST_ERR;
                    goto end;
                }
                if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
                    BUF_MEM_free(buf);
                    ret = -1;
                    s->state = SSL_ST_ERR;
                    goto end;
                }
                s->init_buf = buf;
            }

            if (!ssl3_setup_buffers(s)) {
                ret = -1;
                s->state = SSL_ST_ERR;
                goto end;
            }

            s->init_num = 0;
            s->s3->flags &= ~TLS1_FLAGS_SKIP_CERT_VERIFY;
            s->s3->flags &= ~SSL3_FLAGS_CCS_OK;
            /*
             * Should have been reset by ssl3_get_finished, too.
             */
            s->s3->change_cipher_spec = 0;

            if (s->state != SSL_ST_RENEGOTIATE) {
                /*
                 * Ok, we now need to push on a buffering BIO so that the
                 * output is sent in a way that TCP likes :-)
                 */
                if (!ssl_init_wbio_buffer(s, 1)) {
                    ret = -1;
                    s->state = SSL_ST_ERR;
                    goto end;
                }

                ssl3_init_finished_mac(s);
                s->state = SSL3_ST_SR_CLNT_HELLO_A;
                s->ctx->stats.sess_accept++;
            } else if (!s->s3->send_connection_binding &&
                       !(s->options &
                         SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)) {
                /*
                 * Server attempting to renegotiate with client that doesn't
                 * support secure renegotiation.
                 */
                SSLerr(SSL_F_SSL3_ACCEPT,
                       SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
                ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
                ret = -1;
                s->state = SSL_ST_ERR;
                goto end;
            } else {
                /*
                 * s->state == SSL_ST_RENEGOTIATE, we will just send a
                 * HelloRequest
                 */
                s->ctx->stats.sess_accept_renegotiate++;
                s->state = SSL3_ST_SW_HELLO_REQ_A;
            }
            break;

        case SSL3_ST_SW_HELLO_REQ_A:
        case SSL3_ST_SW_HELLO_REQ_B:

            s->shutdown = 0;
            ret = ssl3_send_hello_request(s);
            if (ret <= 0)
                goto end;
            s->s3->tmp.next_state = SSL3_ST_SW_HELLO_REQ_C;
            s->state = SSL3_ST_SW_FLUSH;
            s->init_num = 0;

            ssl3_init_finished_mac(s);
            break;

        case SSL3_ST_SW_HELLO_REQ_C:
            s->state = SSL_ST_OK;
            break;

        case SSL3_ST_SR_CLNT_HELLO_A:
        case SSL3_ST_SR_CLNT_HELLO_B:
        case SSL3_ST_SR_CLNT_HELLO_C:

            s->shutdown = 0;
            ret = ssl3_get_client_hello(s);
            if (ret <= 0)
                goto end;
#ifndef OPENSSL_NO_SRP
            s->state = SSL3_ST_SR_CLNT_HELLO_D;
        case SSL3_ST_SR_CLNT_HELLO_D:
            {
                int al;
                if ((ret = ssl_check_srp_ext_ClientHello(s, &al)) < 0) {
                    /*
                     * callback indicates firther work to be done
                     */
                    s->rwstate = SSL_X509_LOOKUP;
                    goto end;
                }
                if (ret != SSL_ERROR_NONE) {
                    ssl3_send_alert(s, SSL3_AL_FATAL, al);
                    /*
                     * This is not really an error but the only means to for
                     * a client to detect whether srp is supported.
                     */
                    if (al != TLS1_AD_UNKNOWN_PSK_IDENTITY)
                        SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_CLIENTHELLO_TLSEXT);
                    ret = SSL_TLSEXT_ERR_ALERT_FATAL;
                    ret = -1;
                    s->state = SSL_ST_ERR;
                    goto end;
                }
            }
#endif

            s->renegotiate = 2;
            s->state = SSL3_ST_SW_SRVR_HELLO_A;
            s->init_num = 0;
            break;

        case SSL3_ST_SW_SRVR_HELLO_A:
        case SSL3_ST_SW_SRVR_HELLO_B:
            ret = ssl3_send_server_hello(s);
            if (ret <= 0)
                goto end;
#ifndef OPENSSL_NO_TLSEXT
            if (s->hit) {
                if (s->tlsext_ticket_expected)
                    s->state = SSL3_ST_SW_SESSION_TICKET_A;
                else
                    s->state = SSL3_ST_SW_CHANGE_A;
            }
#else
            if (s->hit)
                s->state = SSL3_ST_SW_CHANGE_A;
#endif
            else
                s->state = SSL3_ST_SW_CERT_A;
            s->init_num = 0;
            break;

        case SSL3_ST_SW_CERT_A:
        case SSL3_ST_SW_CERT_B:
            /* Check if it is anon DH or anon ECDH, */
            /* normal PSK or KRB5 or SRP */
            if (!
                (s->s3->tmp.
                 new_cipher->algorithm_auth & (SSL_aNULL | SSL_aKRB5 |
                                               SSL_aSRP))
&& !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
                ret = ssl3_send_server_certificate(s);
                if (ret <= 0)
                    goto end;
#ifndef OPENSSL_NO_TLSEXT
                if (s->tlsext_status_expected)
                    s->state = SSL3_ST_SW_CERT_STATUS_A;
                else
                    s->state = SSL3_ST_SW_KEY_EXCH_A;
            } else {
                skip = 1;
                s->state = SSL3_ST_SW_KEY_EXCH_A;
            }
#else
            } else
                skip = 1;

            s->state = SSL3_ST_SW_KEY_EXCH_A;
#endif
            s->init_num = 0;
            break;

        case SSL3_ST_SW_KEY_EXCH_A:
        case SSL3_ST_SW_KEY_EXCH_B:
            alg_k = s->s3->tmp.new_cipher->algorithm_mkey;

            /*
             * clear this, it may get reset by
             * send_server_key_exchange
             */
            s->s3->tmp.use_rsa_tmp = 0;

            /*
             * only send if a DH key exchange, fortezza or RSA but we have a
             * sign only certificate PSK: may send PSK identity hints For
             * ECC ciphersuites, we send a serverKeyExchange message only if
             * the cipher suite is either ECDH-anon or ECDHE. In other cases,
             * the server certificate contains the server's public key for
             * key exchange.
             */
            if (0
                /*
                 * PSK: send ServerKeyExchange if PSK identity hint if
                 * provided
                 */
#ifndef OPENSSL_NO_PSK
                || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
#endif
#ifndef OPENSSL_NO_SRP
                /* SRP: send ServerKeyExchange */
                || (alg_k & SSL_kSRP)
#endif
                || (alg_k & SSL_kEDH)
                || (alg_k & SSL_kEECDH)
                || ((alg_k & SSL_kRSA)
                    && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
                        || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
                            && EVP_PKEY_size(s->cert->pkeys
                                             [SSL_PKEY_RSA_ENC].privatekey) *
                            8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
                        )
                    )
                )
                ) {
                ret = ssl3_send_server_key_exchange(s);
                if (ret <= 0)
                    goto end;
            } else
                skip = 1;

            s->state = SSL3_ST_SW_CERT_REQ_A;
            s->init_num = 0;
            break;

        case SSL3_ST_SW_CERT_REQ_A:
        case SSL3_ST_SW_CERT_REQ_B:
            if (                /* don't request cert unless asked for it: */
                   !(s->verify_mode & SSL_VERIFY_PEER) ||
                   /*
                    * if SSL_VERIFY_CLIENT_ONCE is set, don't request cert
                    * during re-negotiation:
                    */
                   ((s->session->peer != NULL) &&
                    (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
                   /*
                    * never request cert in anonymous ciphersuites (see
                    * section "Certificate request" in SSL 3 drafts and in
                    * RFC 2246):
                    */
                   ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
                    /*
                     * ... except when the application insists on
                     * verification (against the specs, but s3_clnt.c accepts
                     * this for SSL 3)
                     */
                    !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
                   /*
                    * never request cert in Kerberos ciphersuites
                    */
                   (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) ||
                   /* don't request certificate for SRP auth */
                   (s->s3->tmp.new_cipher->algorithm_auth & SSL_aSRP)
                   /*
                    * With normal PSK Certificates and Certificate Requests
                    * are omitted
                    */
                   || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
                /* no cert request */
                skip = 1;
                s->s3->tmp.cert_request = 0;
                s->state = SSL3_ST_SW_SRVR_DONE_A;
                if (s->s3->handshake_buffer) {
                    if (!ssl3_digest_cached_records(s)) {
                        s->state = SSL_ST_ERR;
                        return -1;
                    }
                }
            } else {
                s->s3->tmp.cert_request = 1;
                ret = ssl3_send_certificate_request(s);
                if (ret <= 0)
                    goto end;
#ifndef NETSCAPE_HANG_BUG
                s->state = SSL3_ST_SW_SRVR_DONE_A;
#else
                s->state = SSL3_ST_SW_FLUSH;
                s->s3->tmp.next_state = SSL3_ST_SR_CERT_A;
#endif
                s->init_num = 0;
            }
            break;

        case SSL3_ST_SW_SRVR_DONE_A:
        case SSL3_ST_SW_SRVR_DONE_B:
            ret = ssl3_send_server_done(s);
            if (ret <= 0)
                goto end;
            s->s3->tmp.next_state = SSL3_ST_SR_CERT_A;
            s->state = SSL3_ST_SW_FLUSH;
            s->init_num = 0;
            break;

        case SSL3_ST_SW_FLUSH:

            /*
             * This code originally checked to see if any data was pending
             * using BIO_CTRL_INFO and then flushed. This caused problems as
             * documented in PR#1939. The proposed fix doesn't completely
             * resolve this issue as buggy implementations of
             * BIO_CTRL_PENDING still exist. So instead we just flush
             * unconditionally.
             */

            s->rwstate = SSL_WRITING;
            if (BIO_flush(s->wbio) <= 0) {
                ret = -1;
                goto end;
            }
            s->rwstate = SSL_NOTHING;

            s->state = s->s3->tmp.next_state;
            break;

        case SSL3_ST_SR_CERT_A:
        case SSL3_ST_SR_CERT_B:
            if (s->s3->tmp.cert_request) {
                ret = ssl3_get_client_certificate(s);
                if (ret <= 0)
                    goto end;
            }
            s->init_num = 0;
            s->state = SSL3_ST_SR_KEY_EXCH_A;
            break;

        case SSL3_ST_SR_KEY_EXCH_A:
        case SSL3_ST_SR_KEY_EXCH_B:
            ret = ssl3_get_client_key_exchange(s);
            if (ret <= 0)
                goto end;
            if (ret == 2) {
                /*
                 * For the ECDH ciphersuites when the client sends its ECDH
                 * pub key in a certificate, the CertificateVerify message is
                 * not sent. Also for GOST ciphersuites when the client uses
                 * its key from the certificate for key exchange.
                 */
#if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
                s->state = SSL3_ST_SR_FINISHED_A;
#else
                if (s->s3->next_proto_neg_seen)
                    s->state = SSL3_ST_SR_NEXT_PROTO_A;
                else
                    s->state = SSL3_ST_SR_FINISHED_A;
#endif
                s->init_num = 0;
            } else if (SSL_USE_SIGALGS(s)) {
                s->state = SSL3_ST_SR_CERT_VRFY_A;
                s->init_num = 0;
                if (!s->session->peer)
                    break;
                /*
                 * For sigalgs freeze the handshake buffer at this point and
                 * digest cached records.
                 */
                if (!s->s3->handshake_buffer) {
                    SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
                    s->state = SSL_ST_ERR;
                    return -1;
                }
                s->s3->flags |= TLS1_FLAGS_KEEP_HANDSHAKE;
                if (!ssl3_digest_cached_records(s)) {
                    s->state = SSL_ST_ERR;
                    return -1;
                }
            } else {
                int offset = 0;
                int dgst_num;

                s->state = SSL3_ST_SR_CERT_VRFY_A;
                s->init_num = 0;

                /*
                 * We need to get hashes here so if there is a client cert,
                 * it can be verified FIXME - digest processing for
                 * CertificateVerify should be generalized. But it is next
                 * step
                 */
                if (s->s3->handshake_buffer) {
                    if (!ssl3_digest_cached_records(s)) {
                        s->state = SSL_ST_ERR;
                        return -1;
                    }
                }
                for (dgst_num = 0; dgst_num < SSL_MAX_DIGEST; dgst_num++)
                    if (s->s3->handshake_dgst[dgst_num]) {
                        int dgst_size;

                        s->method->ssl3_enc->cert_verify_mac(s,
                                                             EVP_MD_CTX_type
                                                             (s->
                                                              s3->handshake_dgst
                                                              [dgst_num]),
                                                             &(s->s3->
                                                               tmp.cert_verify_md
                                                               [offset]));
                        dgst_size =
                            EVP_MD_CTX_size(s->s3->handshake_dgst[dgst_num]);
                        if (dgst_size < 0) {
                            s->state = SSL_ST_ERR;
                            ret = -1;
                            goto end;
                        }
                        offset += dgst_size;
                    }
            }
            break;

        case SSL3_ST_SR_CERT_VRFY_A:
        case SSL3_ST_SR_CERT_VRFY_B:
            ret = ssl3_get_cert_verify(s);
            if (ret <= 0)
                goto end;

#if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
            s->state = SSL3_ST_SR_FINISHED_A;
#else
            if (s->s3->next_proto_neg_seen)
                s->state = SSL3_ST_SR_NEXT_PROTO_A;
            else
                s->state = SSL3_ST_SR_FINISHED_A;
#endif
            s->init_num = 0;
            break;

#if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
        case SSL3_ST_SR_NEXT_PROTO_A:
        case SSL3_ST_SR_NEXT_PROTO_B:
            /*
             * Enable CCS for NPN. Receiving a CCS clears the flag, so make
             * sure not to re-enable it to ban duplicates. This *should* be the
             * first time we have received one - but we check anyway to be
             * cautious.
             * s->s3->change_cipher_spec is set when a CCS is
             * processed in s3_pkt.c, and remains set until
             * the client's Finished message is read.
             */
            if (!s->s3->change_cipher_spec)
                s->s3->flags |= SSL3_FLAGS_CCS_OK;

            ret = ssl3_get_next_proto(s);
            if (ret <= 0)
                goto end;
            s->init_num = 0;
            s->state = SSL3_ST_SR_FINISHED_A;
            break;
#endif

        case SSL3_ST_SR_FINISHED_A:
        case SSL3_ST_SR_FINISHED_B:
            /*
             * Enable CCS for handshakes without NPN. In NPN the CCS flag has
             * already been set. Receiving a CCS clears the flag, so make
             * sure not to re-enable it to ban duplicates.
             * s->s3->change_cipher_spec is set when a CCS is
             * processed in s3_pkt.c, and remains set until
             * the client's Finished message is read.
             */
            if (!s->s3->change_cipher_spec)
                s->s3->flags |= SSL3_FLAGS_CCS_OK;
            ret = ssl3_get_finished(s, SSL3_ST_SR_FINISHED_A,
                                    SSL3_ST_SR_FINISHED_B);
            if (ret <= 0)
                goto end;
            if (s->hit)
                s->state = SSL_ST_OK;
#ifndef OPENSSL_NO_TLSEXT
            else if (s->tlsext_ticket_expected)
                s->state = SSL3_ST_SW_SESSION_TICKET_A;
#endif
            else
                s->state = SSL3_ST_SW_CHANGE_A;
            s->init_num = 0;
            break;

#ifndef OPENSSL_NO_TLSEXT
        case SSL3_ST_SW_SESSION_TICKET_A:
        case SSL3_ST_SW_SESSION_TICKET_B:
            ret = ssl3_send_newsession_ticket(s);
            if (ret <= 0)
                goto end;
            s->state = SSL3_ST_SW_CHANGE_A;
            s->init_num = 0;
            break;

        case SSL3_ST_SW_CERT_STATUS_A:
        case SSL3_ST_SW_CERT_STATUS_B:
            ret = ssl3_send_cert_status(s);
            if (ret <= 0)
                goto end;
            s->state = SSL3_ST_SW_KEY_EXCH_A;
            s->init_num = 0;
            break;

#endif

        case SSL3_ST_SW_CHANGE_A:
        case SSL3_ST_SW_CHANGE_B:

            s->session->cipher = s->s3->tmp.new_cipher;
            if (!s->method->ssl3_enc->setup_key_block(s)) {
                ret = -1;
                s->state = SSL_ST_ERR;
                goto end;
            }

            ret = ssl3_send_change_cipher_spec(s,
                                               SSL3_ST_SW_CHANGE_A,
                                               SSL3_ST_SW_CHANGE_B);

            if (ret <= 0)
                goto end;
            s->state = SSL3_ST_SW_FINISHED_A;
            s->init_num = 0;

            if (!s->method->ssl3_enc->change_cipher_state(s,
                                                          SSL3_CHANGE_CIPHER_SERVER_WRITE))
            {
                ret = -1;
                s->state = SSL_ST_ERR;
                goto end;
            }

            break;

        case SSL3_ST_SW_FINISHED_A:
        case SSL3_ST_SW_FINISHED_B:
            ret = ssl3_send_finished(s,
                                     SSL3_ST_SW_FINISHED_A,
                                     SSL3_ST_SW_FINISHED_B,
                                     s->method->
                                     ssl3_enc->server_finished_label,
                                     s->method->
                                     ssl3_enc->server_finished_label_len);
            if (ret <= 0)
                goto end;
            s->state = SSL3_ST_SW_FLUSH;
            if (s->hit) {
#if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
                s->s3->tmp.next_state = SSL3_ST_SR_FINISHED_A;
#else
                if (s->s3->next_proto_neg_seen) {
                    s->s3->tmp.next_state = SSL3_ST_SR_NEXT_PROTO_A;
                } else
                    s->s3->tmp.next_state = SSL3_ST_SR_FINISHED_A;
#endif
            } else
                s->s3->tmp.next_state = SSL_ST_OK;
            s->init_num = 0;
            break;

        case SSL_ST_OK:
            /* clean a few things up */
            ssl3_cleanup_key_block(s);

            BUF_MEM_free(s->init_buf);
            s->init_buf = NULL;

            /* remove buffering on output */
            ssl_free_wbio_buffer(s);

            s->init_num = 0;

            if (s->renegotiate == 2) { /* skipped if we just sent a
                                        * HelloRequest */
                s->renegotiate = 0;
                s->new_session = 0;

                ssl_update_cache(s, SSL_SESS_CACHE_SERVER);

                s->ctx->stats.sess_accept_good++;
                /* s->server=1; */
                s->handshake_func = ssl3_accept;

                if (cb != NULL)
                    cb(s, SSL_CB_HANDSHAKE_DONE, 1);
            }

            ret = 1;
            goto end;
            /* break; */

        case SSL_ST_ERR:
        default:
            SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_UNKNOWN_STATE);
            ret = -1;
            goto end;
            /* break; */
        }

        if (!s->s3->tmp.reuse_message && !skip) {
            if (s->debug) {
                if ((ret = BIO_flush(s->wbio)) <= 0)
                    goto end;
            }

            if ((cb != NULL) && (s->state != state)) {
                new_state = s->state;
                s->state = state;
                cb(s, SSL_CB_ACCEPT_LOOP, 1);
                s->state = new_state;
            }
        }
        skip = 0;
    }

Project: openssl

int ssl3_get_cert_verify(SSL *s)
{
    EVP_PKEY *pkey = NULL;
    unsigned char *p;
    int al, ok, ret = 0;
    long n;
    int type = 0, i, j;
    X509 *peer;
    const EVP_MD *md = NULL;
    EVP_MD_CTX mctx;
    EVP_MD_CTX_init(&mctx);

    /*
     * We should only process a CertificateVerify message if we have received
     * a Certificate from the client. If so then |s->session->peer| will be non
     * NULL. In some instances a CertificateVerify message is not required even
     * if the peer has sent a Certificate (e.g. such as in the case of static
     * DH). In that case the ClientKeyExchange processing will skip the
     * CertificateVerify state so we should not arrive here.
     */
    if (s->session->peer == NULL) {
        ret = 1;
        goto end;
    }

    n = s->method->ssl_get_message(s,
                                   SSL3_ST_SR_CERT_VRFY_A,
                                   SSL3_ST_SR_CERT_VRFY_B,
                                   SSL3_MT_CERTIFICATE_VERIFY,
                                   SSL3_RT_MAX_PLAIN_LENGTH, &ok);

    if (!ok)
        return ((int)n);

    peer = s->session->peer;
    pkey = X509_get_pubkey(peer);
    type = X509_certificate_type(peer, pkey);

    if (!(type & EVP_PKT_SIGN)) {
        SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
               SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
        al = SSL_AD_ILLEGAL_PARAMETER;
        goto f_err;
    }

    /* we now have a signature that we need to verify */
    p = (unsigned char *)s->init_msg;
    /* Check for broken implementations of GOST ciphersuites */
    /*
     * If key is GOST and n is exactly 64, it is bare signature without
     * length field
     */
    if (n == 64 && (pkey->type == NID_id_GostR3410_94 ||
                    pkey->type == NID_id_GostR3410_2001)) {
        i = 64;
    } else {
        if (SSL_USE_SIGALGS(s)) {
            int rv = tls12_check_peer_sigalg(&md, s, p, pkey);
            if (rv == -1) {
                al = SSL_AD_INTERNAL_ERROR;
                goto f_err;
            } else if (rv == 0) {
                al = SSL_AD_DECODE_ERROR;
                goto f_err;
            }
#ifdef SSL_DEBUG
            fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
#endif
            p += 2;
            n -= 2;
        }
        n2s(p, i);
        n -= 2;
        if (i > n) {
            SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, SSL_R_LENGTH_MISMATCH);
            al = SSL_AD_DECODE_ERROR;
            goto f_err;
        }
    }
    j = EVP_PKEY_size(pkey);
    if ((i > j) || (n > j) || (n <= 0)) {
        SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, SSL_R_WRONG_SIGNATURE_SIZE);
        al = SSL_AD_DECODE_ERROR;
        goto f_err;
    }

    if (SSL_USE_SIGALGS(s)) {
        long hdatalen = 0;
        void *hdata;
        hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
        if (hdatalen <= 0) {
            SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_INTERNAL_ERROR);
            al = SSL_AD_INTERNAL_ERROR;
            goto f_err;
        }
#ifdef SSL_DEBUG
        fprintf(stderr, "Using TLS 1.2 with client verify alg %s\n",
                EVP_MD_name(md));
#endif
        if (!EVP_VerifyInit_ex(&mctx, md, NULL)
            || !EVP_VerifyUpdate(&mctx, hdata, hdatalen)) {
            SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_EVP_LIB);
            al = SSL_AD_INTERNAL_ERROR;
            goto f_err;
        }

        if (EVP_VerifyFinal(&mctx, p, i, pkey) <= 0) {
            al = SSL_AD_DECRYPT_ERROR;
            SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, SSL_R_BAD_SIGNATURE);
            goto f_err;
        }
    } else
#ifndef OPENSSL_NO_RSA
    if (pkey->type == EVP_PKEY_RSA) {
        i = RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
                       MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH, p, i,
                       pkey->pkey.rsa);
        if (i < 0) {
            al = SSL_AD_DECRYPT_ERROR;
            SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, SSL_R_BAD_RSA_DECRYPT);
            goto f_err;
        }
        if (i == 0) {
            al = SSL_AD_DECRYPT_ERROR;
            SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, SSL_R_BAD_RSA_SIGNATURE);
            goto f_err;
        }
    } else
#endif
#ifndef OPENSSL_NO_DSA
    if (pkey->type == EVP_PKEY_DSA) {
        j = DSA_verify(pkey->save_type,
                       &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
                       SHA_DIGEST_LENGTH, p, i, pkey->pkey.dsa);
        if (j <= 0) {
            /* bad signature */
            al = SSL_AD_DECRYPT_ERROR;
            SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, SSL_R_BAD_DSA_SIGNATURE);
            goto f_err;
        }
    } else
#endif
#ifndef OPENSSL_NO_ECDSA
    if (pkey->type == EVP_PKEY_EC) {
        j = ECDSA_verify(pkey->save_type,
                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
                         SHA_DIGEST_LENGTH, p, i, pkey->pkey.ec);
        if (j <= 0) {
            /* bad signature */
            al = SSL_AD_DECRYPT_ERROR;
            SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, SSL_R_BAD_ECDSA_SIGNATURE);
            goto f_err;
        }
    } else
#endif
    if (pkey->type == NID_id_GostR3410_94
            || pkey->type == NID_id_GostR3410_2001) {
        unsigned char signature[64];
        int idx;
        EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new(pkey, NULL);
        EVP_PKEY_verify_init(pctx);
        if (i != 64) {
            fprintf(stderr, "GOST signature length is %d", i);
        }
        for (idx = 0; idx < 64; idx++) {
            signature[63 - idx] = p[idx];
        }
        j = EVP_PKEY_verify(pctx, signature, 64, s->s3->tmp.cert_verify_md,
                            32);
        EVP_PKEY_CTX_free(pctx);
        if (j <= 0) {
            al = SSL_AD_DECRYPT_ERROR;
            SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, SSL_R_BAD_ECDSA_SIGNATURE);
            goto f_err;
        }
    } else {
        SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_INTERNAL_ERROR);
        al = SSL_AD_UNSUPPORTED_CERTIFICATE;
        goto f_err;
    }

    ret = 1;
    if (0) {
 f_err:
        ssl3_send_alert(s, SSL3_AL_FATAL, al);
        s->state = SSL_ST_ERR;
    }
 end:
    if (s->s3->handshake_buffer) {
        BIO_free(s->s3->handshake_buffer);
        s->s3->handshake_buffer = NULL;
        s->s3->flags &= ~TLS1_FLAGS_KEEP_HANDSHAKE;
    }
    EVP_MD_CTX_cleanup(&mctx);
    EVP_PKEY_free(pkey);
    return (ret);
}

Project: openssl

int ssl3_get_client_hello(SSL *s)
{
    int i, j, ok, al = SSL_AD_INTERNAL_ERROR, ret = -1;
    unsigned int cookie_len;
    long n;
    unsigned long id;
    unsigned char *p, *d;
    SSL_CIPHER *c;
#ifndef OPENSSL_NO_COMP
    unsigned char *q;
    SSL_COMP *comp = NULL;
#endif
    STACK_OF(SSL_CIPHER) *ciphers = NULL;

    if (s->state == SSL3_ST_SR_CLNT_HELLO_C && !s->first_packet)
        goto retry_cert;

    /*
     * We do this so that we will respond with our native type. If we are
     * TLSv1 and we get SSLv3, we will respond with TLSv1, This down
     * switching should be handled by a different method. If we are SSLv3, we
     * will respond with SSLv3, even if prompted with TLSv1.
     */
    if (s->state == SSL3_ST_SR_CLNT_HELLO_A) {
        s->state = SSL3_ST_SR_CLNT_HELLO_B;
    }
    s->first_packet = 1;
    n = s->method->ssl_get_message(s,
                                   SSL3_ST_SR_CLNT_HELLO_B,
                                   SSL3_ST_SR_CLNT_HELLO_C,
                                   SSL3_MT_CLIENT_HELLO,
                                   SSL3_RT_MAX_PLAIN_LENGTH, &ok);

    if (!ok)
        return ((int)n);
    s->first_packet = 0;
    d = p = (unsigned char *)s->init_msg;

    /*
     * 2 bytes for client version, SSL3_RANDOM_SIZE bytes for random, 1 byte
     * for session id length
     */
    if (n < 2 + SSL3_RANDOM_SIZE + 1) {
        al = SSL_AD_DECODE_ERROR;
        SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_LENGTH_TOO_SHORT);
        goto f_err;
    }

    /*
     * use version from inside client hello, not from record header (may
     * differ: see RFC 2246, Appendix E, second paragraph)
     */
    s->client_version = (((int)p[0]) << 8) | (int)p[1];
    p += 2;

    if (SSL_IS_DTLS(s) ? (s->client_version > s->version &&
                          s->method->version != DTLS_ANY_VERSION)
        : (s->client_version < s->version)) {
        SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
        if ((s->client_version >> 8) == SSL3_VERSION_MAJOR &&
            !s->enc_write_ctx && !s->write_hash) {
            /*
             * similar to ssl3_get_record, send alert using remote version
             * number
             */
            s->version = s->client_version;
        }
        al = SSL_AD_PROTOCOL_VERSION;
        goto f_err;
    }

    /*
     * If we require cookies and this ClientHello doesn't contain one, just
     * return since we do not want to allocate any memory yet. So check
     * cookie length...
     */
    if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) {
        unsigned int session_length, cookie_length;

        session_length = *(p + SSL3_RANDOM_SIZE);

        if (p + SSL3_RANDOM_SIZE + session_length + 1 >= d + n) {
            al = SSL_AD_DECODE_ERROR;
            SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_LENGTH_TOO_SHORT);
            goto f_err;
        }
        cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);

        if (cookie_length == 0)
            return 1;
    }

    /* load the client random */
    memcpy(s->s3->client_random, p, SSL3_RANDOM_SIZE);
    p += SSL3_RANDOM_SIZE;

    /* get the session-id */
    j = *(p++);

    if (p + j > d + n) {
        al = SSL_AD_DECODE_ERROR;
        SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_LENGTH_TOO_SHORT);
        goto f_err;
    }

    s->hit = 0;
    /*
     * Versions before 0.9.7 always allow clients to resume sessions in
     * renegotiation. 0.9.7 and later allow this by default, but optionally
     * ignore resumption requests with flag
     * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather
     * than a change to default behavior so that applications relying on this
     * for security won't even compile against older library versions).
     * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to
     * request renegotiation but not a new session (s->new_session remains
     * unset): for servers, this essentially just means that the
     * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION setting will be ignored.
     */
    if ((s->new_session
         && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION))) {
        if (!ssl_get_new_session(s, 1))
            goto err;
    } else {
        i = ssl_get_prev_session(s, p, j, d + n);
        /*
         * Only resume if the session's version matches the negotiated
         * version.
         * RFC 5246 does not provide much useful advice on resumption
         * with a different protocol version. It doesn't forbid it but
         * the sanity of such behaviour would be questionable.
         * In practice, clients do not accept a version mismatch and
         * will abort the handshake with an error.
         */
        if (i == 1 && s->version == s->session->ssl_version) { /* previous
                                                                * session */
            s->hit = 1;
        } else if (i == -1)
            goto err;
        else {                  /* i == 0 */

            if (!ssl_get_new_session(s, 1))
                goto err;
        }
    }

    p += j;

    if (SSL_IS_DTLS(s)) {
        /* cookie stuff */
        if (p + 1 > d + n) {
            al = SSL_AD_DECODE_ERROR;
            SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_LENGTH_TOO_SHORT);
            goto f_err;
        }
        cookie_len = *(p++);

        if (p + cookie_len > d + n) {
            al = SSL_AD_DECODE_ERROR;
            SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_LENGTH_TOO_SHORT);
            goto f_err;
        }

        /*
         * The ClientHello may contain a cookie even if the
         * HelloVerify message has not been sent--make sure that it
         * does not cause an overflow.
         */
        if (cookie_len > sizeof(s->d1->rcvd_cookie)) {
            /* too much data */
            al = SSL_AD_DECODE_ERROR;
            SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
            goto f_err;
        }

        /* verify the cookie if appropriate option is set. */
        if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) && cookie_len > 0) {
            memcpy(s->d1->rcvd_cookie, p, cookie_len);

            if (s->ctx->app_verify_cookie_cb != NULL) {
                if (s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
                                                 cookie_len) == 0) {
                    al = SSL_AD_HANDSHAKE_FAILURE;
                    SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
                           SSL_R_COOKIE_MISMATCH);
                    goto f_err;
                }
                /* else cookie verification succeeded */
            }
            /* default verification */
            else if (memcmp(s->d1->rcvd_cookie, s->d1->cookie,
                            s->d1->cookie_len) != 0) {
                al = SSL_AD_HANDSHAKE_FAILURE;
                SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
                goto f_err;
            }
            /* Set to -2 so if successful we return 2 */
            ret = -2;
        }

        p += cookie_len;
        if (s->method->version == DTLS_ANY_VERSION) {
            /* Select version to use */
            if (s->client_version <= DTLS1_2_VERSION &&
                !(s->options & SSL_OP_NO_DTLSv1_2)) {
                s->version = DTLS1_2_VERSION;
                s->method = DTLSv1_2_server_method();
            } else if (tls1_suiteb(s)) {
                SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
                       SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
                s->version = s->client_version;
                al = SSL_AD_PROTOCOL_VERSION;
                goto f_err;
            } else if (s->client_version <= DTLS1_VERSION &&
                       !(s->options & SSL_OP_NO_DTLSv1)) {
                s->version = DTLS1_VERSION;
                s->method = DTLSv1_server_method();
            } else {
                SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
                       SSL_R_WRONG_VERSION_NUMBER);
                s->version = s->client_version;
                al = SSL_AD_PROTOCOL_VERSION;
                goto f_err;
            }
            s->session->ssl_version = s->version;
        }
    }

    if (p + 2 > d + n) {
        al = SSL_AD_DECODE_ERROR;
        SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_LENGTH_TOO_SHORT);
        goto f_err;
    }
    n2s(p, i);

    if (i == 0) {
        al = SSL_AD_ILLEGAL_PARAMETER;
        SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_NO_CIPHERS_SPECIFIED);
        goto f_err;
    }

    /* i bytes of cipher data + 1 byte for compression length later */
    if ((p + i + 1) > (d + n)) {
        /* not enough data */
        al = SSL_AD_DECODE_ERROR;
        SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH);
        goto f_err;
    }
    if (ssl_bytes_to_cipher_list(s, p, i, &(ciphers)) == NULL) {
        goto err;
    }
    p += i;

    /* If it is a hit, check that the cipher is in the list */
    if (s->hit) {
        j = 0;
        id = s->session->cipher->id;

#ifdef CIPHER_DEBUG
        fprintf(stderr, "client sent %d ciphers\n",
                sk_SSL_CIPHER_num(ciphers));
#endif
        for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) {
            c = sk_SSL_CIPHER_value(ciphers, i);
#ifdef CIPHER_DEBUG
            fprintf(stderr, "client [%2d of %2d]:%s\n",
                    i, sk_SSL_CIPHER_num(ciphers), SSL_CIPHER_get_name(c));
#endif
            if (c->id == id) {
                j = 1;
                break;
            }
        }
        /*
         * Disabled because it can be used in a ciphersuite downgrade attack:
         * CVE-2010-4180.
         */
#if 0
        if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG)
            && (sk_SSL_CIPHER_num(ciphers) == 1)) {
            /*
             * Special case as client bug workaround: the previously used
             * cipher may not be in the current list, the client instead
             * might be trying to continue using a cipher that before wasn't
             * chosen due to server preferences.  We'll have to reject the
             * connection if the cipher is not enabled, though.
             */
            c = sk_SSL_CIPHER_value(ciphers, 0);
            if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0) {
                s->session->cipher = c;
                j = 1;
            }
        }
#endif
        if (j == 0) {
            /*
             * we need to have the cipher in the cipher list if we are asked
             * to reuse it
             */
            al = SSL_AD_ILLEGAL_PARAMETER;
            SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
                   SSL_R_REQUIRED_CIPHER_MISSING);
            goto f_err;
        }
    }

    /* compression */
    i = *(p++);
    if ((p + i) > (d + n)) {
        /* not enough data */
        al = SSL_AD_DECODE_ERROR;
        SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH);
        goto f_err;
    }
#ifndef OPENSSL_NO_COMP
    q = p;
#endif
    for (j = 0; j < i; j++) {
        if (p[j] == 0)
            break;
    }

    p += i;
    if (j >= i) {
        /* no compress */
        al = SSL_AD_DECODE_ERROR;
        SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_NO_COMPRESSION_SPECIFIED);
        goto f_err;
    }
#ifndef OPENSSL_NO_TLSEXT
    /* TLS extensions */
    if (s->version >= SSL3_VERSION) {
        if (!ssl_parse_clienthello_tlsext(s, &p, d, n)) {
            SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_PARSE_TLSEXT);
            goto err;
        }
    }

    /*
     * Check if we want to use external pre-shared secret for this handshake
     * for not reused session only. We need to generate server_random before
     * calling tls_session_secret_cb in order to allow SessionTicket
     * processing to use it in key derivation.
     */
    {
        unsigned char *pos;
        pos = s->s3->server_random;
        if (ssl_fill_hello_random(s, 1, pos, SSL3_RANDOM_SIZE) <= 0) {
            goto f_err;
        }
    }

    if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb) {
        SSL_CIPHER *pref_cipher = NULL;

        s->session->master_key_length = sizeof(s->session->master_key);
        if (s->tls_session_secret_cb(s, s->session->master_key,
                                     &s->session->master_key_length, ciphers,
                                     &pref_cipher,
                                     s->tls_session_secret_cb_arg)) {
            s->hit = 1;
            s->session->ciphers = ciphers;
            s->session->verify_result = X509_V_OK;

            ciphers = NULL;

            /* check if some cipher was preferred by call back */
            pref_cipher =
                pref_cipher ? pref_cipher : ssl3_choose_cipher(s,
                                                               s->
                                                               session->ciphers,
                                                               SSL_get_ciphers
                                                               (s));
            if (pref_cipher == NULL) {
                al = SSL_AD_HANDSHAKE_FAILURE;
                SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_NO_SHARED_CIPHER);
                goto f_err;
            }

            s->session->cipher = pref_cipher;

            if (s->cipher_list)
                sk_SSL_CIPHER_free(s->cipher_list);

            if (s->cipher_list_by_id)
                sk_SSL_CIPHER_free(s->cipher_list_by_id);

            s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
            s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
        }
    }
#endif

    /*
     * Worst case, we will use the NULL compression, but if we have other
     * options, we will now look for them.  We have i-1 compression
     * algorithms from the client, starting at q.
     */
    s->s3->tmp.new_compression = NULL;
#ifndef OPENSSL_NO_COMP
    /* This only happens if we have a cache hit */
    if (s->session->compress_meth != 0) {
        int m, comp_id = s->session->compress_meth;
        /* Perform sanity checks on resumed compression algorithm */
        /* Can't disable compression */
        if (s->options & SSL_OP_NO_COMPRESSION) {
            SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
                   SSL_R_INCONSISTENT_COMPRESSION);
            goto f_err;
        }
        /* Look for resumed compression method */
        for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++) {
            comp = sk_SSL_COMP_value(s->ctx->comp_methods, m);
            if (comp_id == comp->id) {
                s->s3->tmp.new_compression = comp;
                break;
            }
        }
        if (s->s3->tmp.new_compression == NULL) {
            SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
                   SSL_R_INVALID_COMPRESSION_ALGORITHM);
            goto f_err;
        }
        /* Look for resumed method in compression list */
        for (m = 0; m < i; m++) {
            if (q[m] == comp_id)
                break;
        }
        if (m >= i) {
            al = SSL_AD_ILLEGAL_PARAMETER;
            SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
                   SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING);
            goto f_err;
        }
    } else if (s->hit)
        comp = NULL;
    else if (!(s->options & SSL_OP_NO_COMPRESSION) && s->ctx->comp_methods) {
        /* See if we have a match */
        int m, nn, o, v, done = 0;

        nn = sk_SSL_COMP_num(s->ctx->comp_methods);
        for (m = 0; m < nn; m++) {
            comp = sk_SSL_COMP_value(s->ctx->comp_methods, m);
            v = comp->id;
            for (o = 0; o < i; o++) {
                if (v == q[o]) {
                    done = 1;
                    break;
                }
            }
            if (done)
                break;
        }
        if (done)
            s->s3->tmp.new_compression = comp;
        else
            comp = NULL;
    }
#else
    /*
     * If compression is disabled we'd better not try to resume a session
     * using compression.
     */
    if (s->session->compress_meth != 0) {
        SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_INCONSISTENT_COMPRESSION);
        goto f_err;
    }
#endif

    /*
     * Given s->session->ciphers and SSL_get_ciphers, we must pick a cipher
     */

    if (!s->hit) {
#ifdef OPENSSL_NO_COMP
        s->session->compress_meth = 0;
#else
        s->session->compress_meth = (comp == NULL) ? 0 : comp->id;
#endif
        if (s->session->ciphers != NULL)
            sk_SSL_CIPHER_free(s->session->ciphers);
        s->session->ciphers = ciphers;
        if (ciphers == NULL) {
            al = SSL_AD_INTERNAL_ERROR;
            SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
            goto f_err;
        }
        ciphers = NULL;
        if (!tls1_set_server_sigalgs(s)) {
            SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
            goto err;
        }
        /* Let cert callback update server certificates if required */
 retry_cert:
        if (s->cert->cert_cb) {
            int rv = s->cert->cert_cb(s, s->cert->cert_cb_arg);
            if (rv == 0) {
                al = SSL_AD_INTERNAL_ERROR;
                SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_CERT_CB_ERROR);
                goto f_err;
            }
            if (rv < 0) {
                s->rwstate = SSL_X509_LOOKUP;
                return -1;
            }
            s->rwstate = SSL_NOTHING;
        }
        c = ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));

        if (c == NULL) {
            al = SSL_AD_HANDSHAKE_FAILURE;
            SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_NO_SHARED_CIPHER);
            goto f_err;
        }
        s->s3->tmp.new_cipher = c;
    } else {
        /* Session-id reuse */
#ifdef REUSE_CIPHER_BUG
        STACK_OF(SSL_CIPHER) *sk;
        SSL_CIPHER *nc = NULL;
        SSL_CIPHER *ec = NULL;

        if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG) {
            sk = s->session->ciphers;
            for (i = 0; i < sk_SSL_CIPHER_num(sk); i++) {
                c = sk_SSL_CIPHER_value(sk, i);
                if (c->algorithm_enc & SSL_eNULL)
                    nc = c;
                if (SSL_C_IS_EXPORT(c))
                    ec = c;
            }
            if (nc != NULL)
                s->s3->tmp.new_cipher = nc;
            else if (ec != NULL)
                s->s3->tmp.new_cipher = ec;
            else
                s->s3->tmp.new_cipher = s->session->cipher;
        } else
#endif
            s->s3->tmp.new_cipher = s->session->cipher;
    }

    if (!SSL_USE_SIGALGS(s) || !(s->verify_mode & SSL_VERIFY_PEER)) {
        if (!ssl3_digest_cached_records(s))
            goto f_err;
    }

    /*-
    * we now have the following setup.
     * client_random
     * cipher_list          - our prefered list of ciphers
     * ciphers              - the clients prefered list of ciphers
     * compression          - basically ignored right now
     * ssl version is set   - sslv3
     * s->session           - The ssl session has been setup.
     * s->hit               - session reuse flag
     * s->tmp.new_cipher    - the new cipher to use.
     */

    /* Handles TLS extensions that we couldn't check earlier */
    if (s->version >= SSL3_VERSION) {
        if (ssl_check_clienthello_tlsext_late(s) <= 0) {
            SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
            goto err;
        }
    }

    if (ret < 0)
        ret = -ret;
    if (0) {
 f_err:
        ssl3_send_alert(s, SSL3_AL_FATAL, al);
 err:
        s->state = SSL_ST_ERR;
    }

    if (ciphers != NULL)
        sk_SSL_CIPHER_free(ciphers);
    return ret < 0 ? -1 : ret;
}

Project: openssl

static const SSL_METHOD *ssl3_get_server_method(int ver)
{
    if (ver == SSL3_VERSION)
        return (SSLv3_server_method());
    else
        return (NULL);
}

Project: openssl

int ssl3_send_certificate_request(SSL *s)
{
    unsigned char *p, *d;
    int i, j, nl, off, n;
    STACK_OF(X509_NAME) *sk = NULL;
    X509_NAME *name;
    BUF_MEM *buf;

    if (s->state == SSL3_ST_SW_CERT_REQ_A) {
        buf = s->init_buf;

        d = p = ssl_handshake_start(s);

        /* get the list of acceptable cert types */
        p++;
        n = ssl3_get_req_cert_type(s, p);
        d[0] = n;
        p += n;
        n++;

        if (SSL_USE_SIGALGS(s)) {
            const unsigned char *psigs;
            nl = tls12_get_psigalgs(s, &psigs);
            s2n(nl, p);
            memcpy(p, psigs, nl);
            p += nl;
            n += nl + 2;
        }

        off = n;
        p += 2;
        n += 2;

        sk = SSL_get_client_CA_list(s);
        nl = 0;
        if (sk != NULL) {
            for (i = 0; i < sk_X509_NAME_num(sk); i++) {
                name = sk_X509_NAME_value(sk, i);
                j = i2d_X509_NAME(name, NULL);
                if (!BUF_MEM_grow_clean
                    (buf, SSL_HM_HEADER_LENGTH(s) + n + j + 2)) {
                    SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,
                           ERR_R_BUF_LIB);
                    goto err;
                }
                p = ssl_handshake_start(s) + n;
                if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG)) {
                    s2n(j, p);
                    i2d_X509_NAME(name, &p);
                    n += 2 + j;
                    nl += 2 + j;
                } else {
                    d = p;
                    i2d_X509_NAME(name, &p);
                    j -= 2;
                    s2n(j, d);
                    j += 2;
                    n += j;
                    nl += j;
                }
            }
        }
        /* else no CA names */
        p = ssl_handshake_start(s) + off;
        s2n(nl, p);

        ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_REQUEST, n);

#ifdef NETSCAPE_HANG_BUG
        if (!SSL_IS_DTLS(s)) {
            if (!BUF_MEM_grow_clean(buf, s->init_num + 4)) {
                SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST, ERR_R_BUF_LIB);
                goto err;
            }
            p = (unsigned char *)s->init_buf->data + s->init_num;
            /* do the header */
            *(p++) = SSL3_MT_SERVER_DONE;
            *(p++) = 0;
            *(p++) = 0;
            *(p++) = 0;
            s->init_num += 4;
        }
#endif

        s->state = SSL3_ST_SW_CERT_REQ_B;
    }

    /* SSL3_ST_SW_CERT_REQ_B */
    return ssl_do_write(s);
 err:
    s->state = SSL_ST_ERR;
    return (-1);
}

Project: openssl

int ssl3_send_newsession_ticket(SSL *s)
{
    unsigned char *senc = NULL;
    EVP_CIPHER_CTX ctx;
    HMAC_CTX hctx;

    if (s->state == SSL3_ST_SW_SESSION_TICKET_A) {
        unsigned char *p, *macstart;
        const unsigned char *const_p;
        int len, slen_full, slen;
        SSL_SESSION *sess;
        unsigned int hlen;
        SSL_CTX *tctx = s->initial_ctx;
        unsigned char iv[EVP_MAX_IV_LENGTH];
        unsigned char key_name[16];

        /* get session encoding length */
        slen_full = i2d_SSL_SESSION(s->session, NULL);
        /*
         * Some length values are 16 bits, so forget it if session is too
         * long
         */
        if (slen_full == 0 || slen_full > 0xFF00) {
            s->state = SSL_ST_ERR;
            return -1;
        }
        senc = OPENSSL_malloc(slen_full);
        if (!senc) {
            s->state = SSL_ST_ERR;
            return -1;
        }

        EVP_CIPHER_CTX_init(&ctx);
        HMAC_CTX_init(&hctx);

        p = senc;
        if (!i2d_SSL_SESSION(s->session, &p))
            goto err;

        /*
         * create a fresh copy (not shared with other threads) to clean up
         */
        const_p = senc;
        sess = d2i_SSL_SESSION(NULL, &const_p, slen_full);
        if (sess == NULL)
            goto err;
        sess->session_id_length = 0; /* ID is irrelevant for the ticket */

        slen = i2d_SSL_SESSION(sess, NULL);
        if (slen == 0 || slen > slen_full) { /* shouldn't ever happen */
            SSL_SESSION_free(sess);
            goto err;
        }
        p = senc;
        if (!i2d_SSL_SESSION(sess, &p)) {
            SSL_SESSION_free(sess);
            goto err;
        }
        SSL_SESSION_free(sess);

        /*-
         * Grow buffer if need be: the length calculation is as
         * follows handshake_header_length +
         * 4 (ticket lifetime hint) + 2 (ticket length) +
         * 16 (key name) + max_iv_len (iv length) +
         * session_length + max_enc_block_size (max encrypted session
         * length) + max_md_size (HMAC).
         */
        if (!BUF_MEM_grow(s->init_buf,
                          SSL_HM_HEADER_LENGTH(s) + 22 + EVP_MAX_IV_LENGTH +
                          EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen))
            goto err;

        p = ssl_handshake_start(s);
        /*
         * Initialize HMAC and cipher contexts. If callback present it does
         * all the work otherwise use generated values from parent ctx.
         */
        if (tctx->tlsext_ticket_key_cb) {
            if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
                                           &hctx, 1) < 0)
                goto err;
        } else {
            if (RAND_bytes(iv, 16) <= 0)
                goto err;
            if (!EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
                                    tctx->tlsext_tick_aes_key, iv))
                goto err;
            if (!HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
                              tlsext_tick_md(), NULL))
                goto err;
            memcpy(key_name, tctx->tlsext_tick_key_name, 16);
        }

        /*
         * Ticket lifetime hint (advisory only): We leave this unspecified
         * for resumed session (for simplicity), and guess that tickets for
         * new sessions will live as long as their sessions.
         */
        l2n(s->hit ? 0 : s->session->timeout, p);

        /* Skip ticket length for now */
        p += 2;
        /* Output key name */
        macstart = p;
        memcpy(p, key_name, 16);
        p += 16;
        /* output IV */
        memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
        p += EVP_CIPHER_CTX_iv_length(&ctx);
        /* Encrypt session data */
        if (!EVP_EncryptUpdate(&ctx, p, &len, senc, slen))
            goto err;
        p += len;
        if (!EVP_EncryptFinal(&ctx, p, &len))
            goto err;
        p += len;

        if (!HMAC_Update(&hctx, macstart, p - macstart))
            goto err;
        if (!HMAC_Final(&hctx, p, &hlen))
            goto err;

        EVP_CIPHER_CTX_cleanup(&ctx);
        HMAC_CTX_cleanup(&hctx);

        p += hlen;
        /* Now write out lengths: p points to end of data written */
        /* Total length */
        len = p - ssl_handshake_start(s);
        /* Skip ticket lifetime hint */
        p = ssl_handshake_start(s) + 4;
        s2n(len - 6, p);
        ssl_set_handshake_header(s, SSL3_MT_NEWSESSION_TICKET, len);
        s->state = SSL3_ST_SW_SESSION_TICKET_B;
        OPENSSL_free(senc);
    }

    /* SSL3_ST_SW_SESSION_TICKET_B */
    return ssl_do_write(s);
 err:
    if (senc)
        OPENSSL_free(senc);
    EVP_CIPHER_CTX_cleanup(&ctx);
    HMAC_CTX_cleanup(&hctx);
    s->state = SSL_ST_ERR;
    return -1;
}

Project: openssl

int ssl3_send_server_certificate(SSL *s)
{
    CERT_PKEY *cpk;

    if (s->state == SSL3_ST_SW_CERT_A) {
        cpk = ssl_get_server_send_pkey(s);
        if (cpk == NULL) {
            /* VRS: allow null cert if auth == KRB5 */
            if ((s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5) ||
                (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5)) {
                SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,
                       ERR_R_INTERNAL_ERROR);
                s->state = SSL_ST_ERR;
                return (0);
            }
        }

        if (!ssl3_output_cert_chain(s, cpk)) {
            SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR);
            s->state = SSL_ST_ERR;
            return (0);
        }
        s->state = SSL3_ST_SW_CERT_B;
    }

    /* SSL3_ST_SW_CERT_B */
    return ssl_do_write(s);
}

Project: openssl

int ssl3_send_server_done(SSL *s)
{

    if (s->state == SSL3_ST_SW_SRVR_DONE_A) {
        ssl_set_handshake_header(s, SSL3_MT_SERVER_DONE, 0);
        s->state = SSL3_ST_SW_SRVR_DONE_B;
    }

    /* SSL3_ST_SW_SRVR_DONE_B */
    return ssl_do_write(s);
}

Project: openssl

int ssl3_send_server_hello(SSL *s)
{
    unsigned char *buf;
    unsigned char *p, *d;
    int i, sl;
    int al = 0;
    unsigned long l;

    if (s->state == SSL3_ST_SW_SRVR_HELLO_A) {
        buf = (unsigned char *)s->init_buf->data;
#ifdef OPENSSL_NO_TLSEXT
        p = s->s3->server_random;
        if (ssl_fill_hello_random(s, 1, p, SSL3_RANDOM_SIZE) <= 0) {
            s->state = SSL_ST_ERR;
            return -1;
        }
#endif
        /* Do the message type and length last */
        d = p = ssl_handshake_start(s);

        *(p++) = s->version >> 8;
        *(p++) = s->version & 0xff;

        /* Random stuff */
        memcpy(p, s->s3->server_random, SSL3_RANDOM_SIZE);
        p += SSL3_RANDOM_SIZE;

        /*-
         * There are several cases for the session ID to send
         * back in the server hello:
         * - For session reuse from the session cache,
         *   we send back the old session ID.
         * - If stateless session reuse (using a session ticket)
         *   is successful, we send back the client's "session ID"
         *   (which doesn't actually identify the session).
         * - If it is a new session, we send back the new
         *   session ID.
         * - However, if we want the new session to be single-use,
         *   we send back a 0-length session ID.
         * s->hit is non-zero in either case of session reuse,
         * so the following won't overwrite an ID that we're supposed
         * to send back.
         */
        if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
            && !s->hit)
            s->session->session_id_length = 0;

        sl = s->session->session_id_length;
        if (sl > (int)sizeof(s->session->session_id)) {
            SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
            s->state = SSL_ST_ERR;
            return -1;
        }
        *(p++) = sl;
        memcpy(p, s->session->session_id, sl);
        p += sl;

        /* put the cipher */
        i = ssl3_put_cipher_by_char(s->s3->tmp.new_cipher, p);
        p += i;

        /* put the compression method */
#ifdef OPENSSL_NO_COMP
        *(p++) = 0;
#else
        if (s->s3->tmp.new_compression == NULL)
            *(p++) = 0;
        else
            *(p++) = s->s3->tmp.new_compression->id;
#endif
#ifndef OPENSSL_NO_TLSEXT
        if (ssl_prepare_serverhello_tlsext(s) <= 0) {
            SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, SSL_R_SERVERHELLO_TLSEXT);
            s->state = SSL_ST_ERR;
            return -1;
        }
        if ((p =
             ssl_add_serverhello_tlsext(s, p, buf + SSL3_RT_MAX_PLAIN_LENGTH,
                                        &al)) == NULL) {
            ssl3_send_alert(s, SSL3_AL_FATAL, al);
            SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
            s->state = SSL_ST_ERR;
            return -1;
        }
#endif
        /* do the header */
        l = (p - d);
        ssl_set_handshake_header(s, SSL3_MT_SERVER_HELLO, l);
        s->state = SSL3_ST_SW_SRVR_HELLO_B;
    }

    /* SSL3_ST_SW_SRVR_HELLO_B */
    return ssl_do_write(s);
}

Project: openssl

int ssl3_send_server_key_exchange(SSL *s)
{
#ifndef OPENSSL_NO_RSA
    unsigned char *q;
    int j, num;
    RSA *rsa;
    unsigned char md_buf[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH];
    unsigned int u;
#endif
#ifndef OPENSSL_NO_DH
    DH *dh = NULL, *dhp;
#endif
#ifndef OPENSSL_NO_ECDH
    EC_KEY *ecdh = NULL, *ecdhp;
    unsigned char *encodedPoint = NULL;
    int encodedlen = 0;
    int curve_id = 0;
    BN_CTX *bn_ctx = NULL;
#endif
    EVP_PKEY *pkey;
    const EVP_MD *md = NULL;
    unsigned char *p, *d;
    int al, i;
    unsigned long type;
    int n;
    CERT *cert;
    BIGNUM *r[4];
    int nr[4], kn;
    BUF_MEM *buf;
    EVP_MD_CTX md_ctx;

    EVP_MD_CTX_init(&md_ctx);
    if (s->state == SSL3_ST_SW_KEY_EXCH_A) {
        type = s->s3->tmp.new_cipher->algorithm_mkey;
        cert = s->cert;

        buf = s->init_buf;

        r[0] = r[1] = r[2] = r[3] = NULL;
        n = 0;
#ifndef OPENSSL_NO_RSA
        if (type & SSL_kRSA) {
            rsa = cert->rsa_tmp;
            if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL)) {
                rsa = s->cert->rsa_tmp_cb(s,
                                          SSL_C_IS_EXPORT(s->s3->
                                                          tmp.new_cipher),
                                          SSL_C_EXPORT_PKEYLENGTH(s->s3->
                                                                  tmp.new_cipher));
                if (rsa == NULL) {
                    al = SSL_AD_HANDSHAKE_FAILURE;
                    SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
                           SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
                    goto f_err;
                }
                RSA_up_ref(rsa);
                cert->rsa_tmp = rsa;
            }
            if (rsa == NULL) {
                al = SSL_AD_HANDSHAKE_FAILURE;
                SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
                       SSL_R_MISSING_TMP_RSA_KEY);
                goto f_err;
            }
            r[0] = rsa->n;
            r[1] = rsa->e;
            s->s3->tmp.use_rsa_tmp = 1;
        } else
#endif
#ifndef OPENSSL_NO_DH
        if (type & SSL_kEDH) {
            dhp = cert->dh_tmp;
            if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
                dhp = s->cert->dh_tmp_cb(s,
                                         SSL_C_IS_EXPORT(s->s3->
                                                         tmp.new_cipher),
                                         SSL_C_EXPORT_PKEYLENGTH(s->s3->
                                                                 tmp.new_cipher));
            if (dhp == NULL) {
                al = SSL_AD_HANDSHAKE_FAILURE;
                SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
                       SSL_R_MISSING_TMP_DH_KEY);
                goto f_err;
            }

            if (s->s3->tmp.dh != NULL) {
                SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
                       ERR_R_INTERNAL_ERROR);
                goto err;
            }

            if ((dh = DHparams_dup(dhp)) == NULL) {
                SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_DH_LIB);
                goto err;
            }

            s->s3->tmp.dh = dh;
            if ((dhp->pub_key == NULL ||
                 dhp->priv_key == NULL ||
                 (s->options & SSL_OP_SINGLE_DH_USE))) {
                if (!DH_generate_key(dh)) {
                    SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_DH_LIB);
                    goto err;
                }
            } else {
                dh->pub_key = BN_dup(dhp->pub_key);
                dh->priv_key = BN_dup(dhp->priv_key);
                if ((dh->pub_key == NULL) || (dh->priv_key == NULL)) {
                    SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_DH_LIB);
                    goto err;
                }
            }
            r[0] = dh->p;
            r[1] = dh->g;
            r[2] = dh->pub_key;
        } else
#endif
#ifndef OPENSSL_NO_ECDH
        if (type & SSL_kEECDH) {
            const EC_GROUP *group;

            ecdhp = cert->ecdh_tmp;
            if (s->cert->ecdh_tmp_auto) {
                /* Get NID of appropriate shared curve */
                int nid = tls1_shared_curve(s, -2);
                if (nid != NID_undef)
                    ecdhp = EC_KEY_new_by_curve_name(nid);
            } else if ((ecdhp == NULL) && s->cert->ecdh_tmp_cb) {
                ecdhp = s->cert->ecdh_tmp_cb(s,
                                             SSL_C_IS_EXPORT(s->s3->
                                                             tmp.new_cipher),
                                             SSL_C_EXPORT_PKEYLENGTH(s->
                                                                     s3->tmp.new_cipher));
            }
            if (ecdhp == NULL) {
                al = SSL_AD_HANDSHAKE_FAILURE;
                SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
                       SSL_R_MISSING_TMP_ECDH_KEY);
                goto f_err;
            }

            if (s->s3->tmp.ecdh != NULL) {
                SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
                       ERR_R_INTERNAL_ERROR);
                goto err;
            }

            /* Duplicate the ECDH structure. */
            if (ecdhp == NULL) {
                SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB);
                goto err;
            }
            if (s->cert->ecdh_tmp_auto)
                ecdh = ecdhp;
            else if ((ecdh = EC_KEY_dup(ecdhp)) == NULL) {
                SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB);
                goto err;
            }

            s->s3->tmp.ecdh = ecdh;
            if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
                (EC_KEY_get0_private_key(ecdh) == NULL) ||
                (s->options & SSL_OP_SINGLE_ECDH_USE)) {
                if (!EC_KEY_generate_key(ecdh)) {
                    SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
                           ERR_R_ECDH_LIB);
                    goto err;
                }
            }

            if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
                (EC_KEY_get0_public_key(ecdh) == NULL) ||
                (EC_KEY_get0_private_key(ecdh) == NULL)) {
                SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB);
                goto err;
            }

            if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
                (EC_GROUP_get_degree(group) > 163)) {
                SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
                       SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
                goto err;
            }

            /*
             * XXX: For now, we only support ephemeral ECDH keys over named
             * (not generic) curves. For supported named curves, curve_id is
             * non-zero.
             */
            if ((curve_id =
                 tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
                == 0) {
                SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
                       SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
                goto err;
            }

            /*
             * Encode the public key. First check the size of encoding and
             * allocate memory accordingly.
             */
            encodedlen = EC_POINT_point2oct(group,
                                            EC_KEY_get0_public_key(ecdh),
                                            POINT_CONVERSION_UNCOMPRESSED,
                                            NULL, 0, NULL);

            encodedPoint = (unsigned char *)
                OPENSSL_malloc(encodedlen * sizeof(unsigned char));
            bn_ctx = BN_CTX_new();
            if ((encodedPoint == NULL) || (bn_ctx == NULL)) {
                SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
                       ERR_R_MALLOC_FAILURE);
                goto err;
            }

            encodedlen = EC_POINT_point2oct(group,
                                            EC_KEY_get0_public_key(ecdh),
                                            POINT_CONVERSION_UNCOMPRESSED,
                                            encodedPoint, encodedlen, bn_ctx);

            if (encodedlen == 0) {
                SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB);
                goto err;
            }

            BN_CTX_free(bn_ctx);
            bn_ctx = NULL;

            /*
             * XXX: For now, we only support named (not generic) curves in
             * ECDH ephemeral key exchanges. In this situation, we need four
             * additional bytes to encode the entire ServerECDHParams
             * structure.
             */
            n = 4 + encodedlen;

            /*
             * We'll generate the serverKeyExchange message explicitly so we
             * can set these to NULLs
             */
            r[0] = NULL;
            r[1] = NULL;
            r[2] = NULL;
            r[3] = NULL;
        } else
#endif                          /* !OPENSSL_NO_ECDH */
#ifndef OPENSSL_NO_PSK
        if (type & SSL_kPSK) {
            /*
             * reserve size for record length and PSK identity hint
             */
            n += 2 + strlen(s->ctx->psk_identity_hint);
        } else
#endif                          /* !OPENSSL_NO_PSK */
#ifndef OPENSSL_NO_SRP
        if (type & SSL_kSRP) {
            if ((s->srp_ctx.N == NULL) ||
                (s->srp_ctx.g == NULL) ||
                (s->srp_ctx.s == NULL) || (s->srp_ctx.B == NULL)) {
                SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
                       SSL_R_MISSING_SRP_PARAM);
                goto err;
            }
            r[0] = s->srp_ctx.N;
            r[1] = s->srp_ctx.g;
            r[2] = s->srp_ctx.s;
            r[3] = s->srp_ctx.B;
        } else
#endif
        {
            al = SSL_AD_HANDSHAKE_FAILURE;
            SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
                   SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
            goto f_err;
        }
        for (i = 0; i < 4 && r[i] != NULL; i++) {
            nr[i] = BN_num_bytes(r[i]);
#ifndef OPENSSL_NO_SRP
            if ((i == 2) && (type & SSL_kSRP))
                n += 1 + nr[i];
            else
#endif
                n += 2 + nr[i];
        }

        if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL | SSL_aSRP))
            && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
            if ((pkey = ssl_get_sign_pkey(s, s->s3->tmp.new_cipher, &md))
                == NULL) {
                al = SSL_AD_DECODE_ERROR;
                goto f_err;
            }
            kn = EVP_PKEY_size(pkey);
        } else {
            pkey = NULL;
            kn = 0;
        }

        if (!BUF_MEM_grow_clean(buf, n + SSL_HM_HEADER_LENGTH(s) + kn)) {
            SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_LIB_BUF);
            goto err;
        }
        d = p = ssl_handshake_start(s);

        for (i = 0; i < 4 && r[i] != NULL; i++) {
#ifndef OPENSSL_NO_SRP
            if ((i == 2) && (type & SSL_kSRP)) {
                *p = nr[i];
                p++;
            } else
#endif
                s2n(nr[i], p);
            BN_bn2bin(r[i], p);
            p += nr[i];
        }

#ifndef OPENSSL_NO_ECDH
        if (type & SSL_kEECDH) {
            /*
             * XXX: For now, we only support named (not generic) curves. In
             * this situation, the serverKeyExchange message has: [1 byte
             * CurveType], [2 byte CurveName] [1 byte length of encoded
             * point], followed by the actual encoded point itself
             */
            *p = NAMED_CURVE_TYPE;
            p += 1;
            *p = 0;
            p += 1;
            *p = curve_id;
            p += 1;
            *p = encodedlen;
            p += 1;
            memcpy((unsigned char *)p,
                   (unsigned char *)encodedPoint, encodedlen);
            OPENSSL_free(encodedPoint);
            encodedPoint = NULL;
            p += encodedlen;
        }
#endif

#ifndef OPENSSL_NO_PSK
        if (type & SSL_kPSK) {
            /* copy PSK identity hint */
            s2n(strlen(s->ctx->psk_identity_hint), p);
            strncpy((char *)p, s->ctx->psk_identity_hint,
                    strlen(s->ctx->psk_identity_hint));
            p += strlen(s->ctx->psk_identity_hint);
        }
#endif

        /* not anonymous */
        if (pkey != NULL) {
            /*
             * n is the length of the params, they start at &(d[4]) and p
             * points to the space at the end.
             */
#ifndef OPENSSL_NO_RSA
            if (pkey->type == EVP_PKEY_RSA && !SSL_USE_SIGALGS(s)) {
                q = md_buf;
                j = 0;
                for (num = 2; num > 0; num--) {
                    EVP_MD_CTX_set_flags(&md_ctx,
                                         EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
                    EVP_DigestInit_ex(&md_ctx, (num == 2)
                                      ? s->ctx->md5 : s->ctx->sha1, NULL);
                    EVP_DigestUpdate(&md_ctx, &(s->s3->client_random[0]),
                                     SSL3_RANDOM_SIZE);
                    EVP_DigestUpdate(&md_ctx, &(s->s3->server_random[0]),
                                     SSL3_RANDOM_SIZE);
                    EVP_DigestUpdate(&md_ctx, d, n);
                    EVP_DigestFinal_ex(&md_ctx, q, (unsigned int *)&i);
                    q += i;
                    j += i;
                }
                if (RSA_sign(NID_md5_sha1, md_buf, j,
                             &(p[2]), &u, pkey->pkey.rsa) <= 0) {
                    SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_LIB_RSA);
                    goto err;
                }
                s2n(u, p);
                n += u + 2;
            } else
#endif
            if (md) {
                /* send signature algorithm */
                if (SSL_USE_SIGALGS(s)) {
                    if (!tls12_get_sigandhash(p, pkey, md)) {
                        /* Should never happen */
                        al = SSL_AD_INTERNAL_ERROR;
                        SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
                               ERR_R_INTERNAL_ERROR);
                        goto f_err;
                    }
                    p += 2;
                }
#ifdef SSL_DEBUG
                fprintf(stderr, "Using hash %s\n", EVP_MD_name(md));
#endif
                EVP_SignInit_ex(&md_ctx, md, NULL);
                EVP_SignUpdate(&md_ctx, &(s->s3->client_random[0]),
                               SSL3_RANDOM_SIZE);
                EVP_SignUpdate(&md_ctx, &(s->s3->server_random[0]),
                               SSL3_RANDOM_SIZE);
                EVP_SignUpdate(&md_ctx, d, n);
                if (!EVP_SignFinal(&md_ctx, &(p[2]),
                                   (unsigned int *)&i, pkey)) {
                    SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_LIB_EVP);
                    goto err;
                }
                s2n(i, p);
                n += i + 2;
                if (SSL_USE_SIGALGS(s))
                    n += 2;
            } else {
                /* Is this error check actually needed? */
                al = SSL_AD_HANDSHAKE_FAILURE;
                SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
                       SSL_R_UNKNOWN_PKEY_TYPE);
                goto f_err;
            }
        }

        ssl_set_handshake_header(s, SSL3_MT_SERVER_KEY_EXCHANGE, n);
    }

    s->state = SSL3_ST_SW_KEY_EXCH_B;
    EVP_MD_CTX_cleanup(&md_ctx);
    return ssl_do_write(s);
 f_err:
    ssl3_send_alert(s, SSL3_AL_FATAL, al);
 err:
#ifndef OPENSSL_NO_ECDH
    if (encodedPoint != NULL)
        OPENSSL_free(encodedPoint);
    BN_CTX_free(bn_ctx);
#endif
    EVP_MD_CTX_cleanup(&md_ctx);
    s->state = SSL_ST_ERR;
    return (-1);
}

Project: openssl

static int ssl_check_srp_ext_ClientHello(SSL *s, int *al)
{
    int ret = SSL_ERROR_NONE;

    *al = SSL_AD_UNRECOGNIZED_NAME;

    if ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) &&
        (s->srp_ctx.TLS_ext_srp_username_callback != NULL)) {
        if (s->srp_ctx.login == NULL) {
            /*
             * RFC 5054 says SHOULD reject, we do so if There is no srp
             * login name
             */
            ret = SSL3_AL_FATAL;
            *al = SSL_AD_UNKNOWN_PSK_IDENTITY;
        } else {
            ret = SSL_srp_server_param_with_username(s, al);
        }
    }
    return ret;
}