Merge illumos-gate

[unleashed.git] / lib / libssl / ssl_both.c

/* $OpenBSD: ssl_both.c,v 1.12 2018/08/24 17:30:32 jsing Exp $ */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 *
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 *
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 *
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */
/* ====================================================================
 * Copyright (c) 1998-2002 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    openssl-core@openssl.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */
/* ====================================================================
 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 * ECC cipher suite support in OpenSSL originally developed by
 * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
 */

#include <limits.h>
#include <stdio.h>
#include <string.h>

#include "ssl_locl.h"

#include <openssl/buffer.h>
#include <openssl/evp.h>
#include <openssl/objects.h>
#include <openssl/x509.h>

#include "bytestring.h"

/*
 * Send s->internal->init_buf in records of type 'type' (SSL3_RT_HANDSHAKE or
 * SSL3_RT_CHANGE_CIPHER_SPEC).
 */
int
ssl3_do_write(SSL *s, int type)
{
        int ret;

        ret = ssl3_write_bytes(s, type, &s->internal->init_buf->data[s->internal->init_off],
            s->internal->init_num);
        if (ret < 0)
                return (-1);

        if (type == SSL3_RT_HANDSHAKE)
                /*
                 * Should not be done for 'Hello Request's, but in that case
                 * we'll ignore the result anyway.
                 */
                tls1_finish_mac(s,
                    (unsigned char *)&s->internal->init_buf->data[s->internal->init_off], ret);

        if (ret == s->internal->init_num) {
                if (s->internal->msg_callback)
                        s->internal->msg_callback(1, s->version, type, s->internal->init_buf->data,
                            (size_t)(s->internal->init_off + s->internal->init_num), s,
                            s->internal->msg_callback_arg);
                return (1);
        }

        s->internal->init_off += ret;
        s->internal->init_num -= ret;

        return (0);
}

int
ssl3_send_finished(SSL *s, int a, int b, const char *sender, int slen)
{
        CBB cbb, finished;
        int md_len;

        memset(&cbb, 0, sizeof(cbb));

        if (S3I(s)->hs.state == a) {
                md_len = TLS1_FINISH_MAC_LENGTH;
                OPENSSL_assert(md_len <= EVP_MAX_MD_SIZE);

                if (tls1_final_finish_mac(s, sender, slen,
                    S3I(s)->tmp.finish_md) != md_len)
                        return (0);
                S3I(s)->tmp.finish_md_len = md_len;

                /* Copy finished so we can use it for renegotiation checks. */
                if (s->internal->type == SSL_ST_CONNECT) {
                        memcpy(S3I(s)->previous_client_finished,
                            S3I(s)->tmp.finish_md, md_len);
                        S3I(s)->previous_client_finished_len = md_len;
                } else {
                        memcpy(S3I(s)->previous_server_finished,
                            S3I(s)->tmp.finish_md, md_len);
                        S3I(s)->previous_server_finished_len = md_len;
                }

                if (!ssl3_handshake_msg_start(s, &cbb, &finished,
                    SSL3_MT_FINISHED))
                        goto err;
                if (!CBB_add_bytes(&finished, S3I(s)->tmp.finish_md, md_len))
                        goto err;
                if (!ssl3_handshake_msg_finish(s, &cbb))
                        goto err;

                S3I(s)->hs.state = b;
        }

        return (ssl3_handshake_write(s));

 err:
        CBB_cleanup(&cbb);

        return (-1);
}

/*
 * ssl3_take_mac calculates the Finished MAC for the handshakes messages seen
 * so far.
 */
static void
ssl3_take_mac(SSL *s)
{
        const char *sender;
        int slen;

        /*
         * If no new cipher setup return immediately: other functions will
         * set the appropriate error.
         */
        if (S3I(s)->hs.new_cipher == NULL)
                return;

        if (S3I(s)->hs.state & SSL_ST_CONNECT) {
                sender = TLS_MD_SERVER_FINISH_CONST;
                slen = TLS_MD_SERVER_FINISH_CONST_SIZE;
        } else {
                sender = TLS_MD_CLIENT_FINISH_CONST;
                slen = TLS_MD_CLIENT_FINISH_CONST_SIZE;
        }

        S3I(s)->tmp.peer_finish_md_len =
            tls1_final_finish_mac(s, sender, slen,
                S3I(s)->tmp.peer_finish_md);
}

int
ssl3_get_finished(SSL *s, int a, int b)
{
        int al, ok, md_len;
        long n;
        CBS cbs;

        /* should actually be 36+4 :-) */
        n = s->method->internal->ssl_get_message(s, a, b, SSL3_MT_FINISHED, 64, &ok);
        if (!ok)
                return ((int)n);

        /* If this occurs, we have missed a message */
        if (!S3I(s)->change_cipher_spec) {
                al = SSL_AD_UNEXPECTED_MESSAGE;
                SSLerror(s, SSL_R_GOT_A_FIN_BEFORE_A_CCS);
                goto f_err;
        }
        S3I(s)->change_cipher_spec = 0;

        md_len = TLS1_FINISH_MAC_LENGTH;

        if (n < 0) {
                al = SSL_AD_DECODE_ERROR;
                SSLerror(s, SSL_R_BAD_DIGEST_LENGTH);
                goto f_err;
        }

        CBS_init(&cbs, s->internal->init_msg, n);

        if (S3I(s)->tmp.peer_finish_md_len != md_len ||
            CBS_len(&cbs) != md_len) {
                al = SSL_AD_DECODE_ERROR;
                SSLerror(s, SSL_R_BAD_DIGEST_LENGTH);
                goto f_err;
        }

        if (!CBS_mem_equal(&cbs, S3I(s)->tmp.peer_finish_md, CBS_len(&cbs))) {
                al = SSL_AD_DECRYPT_ERROR;
                SSLerror(s, SSL_R_DIGEST_CHECK_FAILED);
                goto f_err;
        }

        /* Copy finished so we can use it for renegotiation checks. */
        OPENSSL_assert(md_len <= EVP_MAX_MD_SIZE);
        if (s->internal->type == SSL_ST_ACCEPT) {
                memcpy(S3I(s)->previous_client_finished,
                    S3I(s)->tmp.peer_finish_md, md_len);
                S3I(s)->previous_client_finished_len = md_len;
        } else {
                memcpy(S3I(s)->previous_server_finished,
                    S3I(s)->tmp.peer_finish_md, md_len);
                S3I(s)->previous_server_finished_len = md_len;
        }

        return (1);
f_err:
        ssl3_send_alert(s, SSL3_AL_FATAL, al);
        return (0);
}

/* for these 2 messages, we need to
 * ssl->enc_read_ctx                    re-init
 * ssl->s3->internal->read_sequence             zero
 * ssl->s3->internal->read_mac_secret           re-init
 * ssl->session->read_sym_enc           assign
 * ssl->session->read_hash              assign
 */
int
ssl3_send_change_cipher_spec(SSL *s, int a, int b)
{
        size_t outlen;
        CBB cbb;

        memset(&cbb, 0, sizeof(cbb));

        if (S3I(s)->hs.state == a) {
                if (!CBB_init_fixed(&cbb, s->internal->init_buf->data,
                    s->internal->init_buf->length))
                        goto err;
                if (!CBB_add_u8(&cbb, SSL3_MT_CCS))
                        goto err;
                if (!CBB_finish(&cbb, NULL, &outlen))
                        goto err;

                if (outlen > INT_MAX)
                        goto err;

                s->internal->init_num = (int)outlen;
                s->internal->init_off = 0;

                if (SSL_IS_DTLS(s)) {
                        D1I(s)->handshake_write_seq =
                            D1I(s)->next_handshake_write_seq;
                        dtls1_set_message_header_int(s, SSL3_MT_CCS, 0,
                            D1I(s)->handshake_write_seq, 0, 0);
                        dtls1_buffer_message(s, 1);
                }

                S3I(s)->hs.state = b;
        }

        /* SSL3_ST_CW_CHANGE_B */
        return ssl3_record_write(s, SSL3_RT_CHANGE_CIPHER_SPEC);

 err:
        CBB_cleanup(&cbb);

        return -1;
}

static int
ssl3_add_cert(CBB *cbb, X509 *x)
{
        unsigned char *data;
        int cert_len;
        int ret = 0;
        CBB cert;

        if ((cert_len = i2d_X509(x, NULL)) < 0)
                goto err;

        if (!CBB_add_u24_length_prefixed(cbb, &cert))
                goto err;
        if (!CBB_add_space(&cert, &data, cert_len))
                goto err;
        if (i2d_X509(x, &data) < 0)
                goto err;
        if (!CBB_flush(cbb))
                goto err;

        ret = 1;

 err:
        return (ret);
}

int
ssl3_output_cert_chain(SSL *s, CBB *cbb, X509 *x)
{
        int no_chain = 0;
        CBB cert_list;
        int ret = 0;
        int i;

        if (!CBB_add_u24_length_prefixed(cbb, &cert_list))
                goto err;

        if ((s->internal->mode & SSL_MODE_NO_AUTO_CHAIN) || s->ctx->extra_certs)
                no_chain = 1;

        /* TLSv1 sends a chain with nothing in it, instead of an alert. */
        if (x != NULL) {
                if (no_chain) {
                        if (!ssl3_add_cert(&cert_list, x))
                                goto err;
                } else {
                        X509_STORE_CTX xs_ctx;

                        if (!X509_STORE_CTX_init(&xs_ctx, s->ctx->cert_store,
                            x, NULL)) {
                                SSLerror(s, ERR_R_X509_LIB);
                                goto err;
                        }
                        X509_verify_cert(&xs_ctx);

                        /* Don't leave errors in the queue. */
                        ERR_clear_error();
                        for (i = 0; i < sk_X509_num(xs_ctx.chain); i++) {
                                x = sk_X509_value(xs_ctx.chain, i);
                                if (!ssl3_add_cert(&cert_list, x)) {
                                        X509_STORE_CTX_cleanup(&xs_ctx);
                                        goto err;
                                }
                        }
                        X509_STORE_CTX_cleanup(&xs_ctx);
                }
        }

        /* Thawte special :-) */
        for (i = 0; i < sk_X509_num(s->ctx->extra_certs); i++) {
                x = sk_X509_value(s->ctx->extra_certs, i);
                if (!ssl3_add_cert(&cert_list, x))
                        goto err;
        }

        if (!CBB_flush(cbb))
                goto err;

        ret = 1;

 err:
        return (ret);
}

/*
 * Obtain handshake message of message type 'mt' (any if mt == -1),
 * maximum acceptable body length 'max'.
 * The first four bytes (msg_type and length) are read in state 'st1',
 * the body is read in state 'stn'.
 */
long
ssl3_get_message(SSL *s, int st1, int stn, int mt, long max, int *ok)
{
        unsigned char *p;
        uint32_t l;
        long n;
        int i, al;
        CBS cbs;
        uint8_t u8;

        if (S3I(s)->tmp.reuse_message) {
                S3I(s)->tmp.reuse_message = 0;
                if ((mt >= 0) && (S3I(s)->tmp.message_type != mt)) {
                        al = SSL_AD_UNEXPECTED_MESSAGE;
                        SSLerror(s, SSL_R_UNEXPECTED_MESSAGE);
                        goto f_err;
                }
                *ok = 1;
                s->internal->init_msg = s->internal->init_buf->data + 4;
                s->internal->init_num = (int)S3I(s)->tmp.message_size;
                return s->internal->init_num;
        }

        p = (unsigned char *)s->internal->init_buf->data;

        /* s->internal->init_num < 4 */
        if (S3I(s)->hs.state == st1) {
                int skip_message;

                do {
                        while (s->internal->init_num < 4) {
                                i = s->method->internal->ssl_read_bytes(s,
                                    SSL3_RT_HANDSHAKE, &p[s->internal->init_num],
                                    4 - s->internal->init_num, 0);
                                if (i <= 0) {
                                        s->internal->rwstate = SSL_READING;
                                        *ok = 0;
                                        return i;
                                }
                                s->internal->init_num += i;
                        }

                        skip_message = 0;
                        if (!s->server && p[0] == SSL3_MT_HELLO_REQUEST) {
                                /*
                                 * The server may always send 'Hello Request'
                                 * messages -- we are doing a handshake anyway
                                 * now, so ignore them if their format is
                                 * correct.  Does not count for 'Finished' MAC.
                                 */
                                if (p[1] == 0 && p[2] == 0 &&p[3] == 0) {
                                        s->internal->init_num = 0;
                                        skip_message = 1;

                                        if (s->internal->msg_callback)
                                                s->internal->msg_callback(0, s->version,
                                                    SSL3_RT_HANDSHAKE, p, 4, s,
                                                    s->internal->msg_callback_arg);
                                }
                        }
                } while (skip_message);

                /* s->internal->init_num == 4 */

                if ((mt >= 0) && (*p != mt)) {
                        al = SSL_AD_UNEXPECTED_MESSAGE;
                        SSLerror(s, SSL_R_UNEXPECTED_MESSAGE);
                        goto f_err;
                }

                CBS_init(&cbs, p, 4);
                if (!CBS_get_u8(&cbs, &u8) ||
                    !CBS_get_u24(&cbs, &l)) {
                        SSLerror(s, ERR_R_BUF_LIB);
                        goto err;
                }
                S3I(s)->tmp.message_type = u8;

                if (l > (unsigned long)max) {
                        al = SSL_AD_ILLEGAL_PARAMETER;
                        SSLerror(s, SSL_R_EXCESSIVE_MESSAGE_SIZE);
                        goto f_err;
                }
                if (l && !BUF_MEM_grow_clean(s->internal->init_buf, l + 4)) {
                        SSLerror(s, ERR_R_BUF_LIB);
                        goto err;
                }
                S3I(s)->tmp.message_size = l;
                S3I(s)->hs.state = stn;

                s->internal->init_msg = s->internal->init_buf->data + 4;
                s->internal->init_num = 0;
        }

        /* next state (stn) */
        p = s->internal->init_msg;
        n = S3I(s)->tmp.message_size - s->internal->init_num;
        while (n > 0) {
                i = s->method->internal->ssl_read_bytes(s, SSL3_RT_HANDSHAKE,
                    &p[s->internal->init_num], n, 0);
                if (i <= 0) {
                        s->internal->rwstate = SSL_READING;
                        *ok = 0;
                        return i;
                }
                s->internal->init_num += i;
                n -= i;
        }

        /* If receiving Finished, record MAC of prior handshake messages for
         * Finished verification. */
        if (*s->internal->init_buf->data == SSL3_MT_FINISHED)
                ssl3_take_mac(s);

        /* Feed this message into MAC computation. */
        if (s->internal->mac_packet) {
                tls1_finish_mac(s, (unsigned char *)s->internal->init_buf->data,
                    s->internal->init_num + 4);

                if (s->internal->msg_callback)
                        s->internal->msg_callback(0, s->version,
                            SSL3_RT_HANDSHAKE, s->internal->init_buf->data,
                            (size_t)s->internal->init_num + 4, s,
                            s->internal->msg_callback_arg);
        }

        *ok = 1;
        return (s->internal->init_num);

f_err:
        ssl3_send_alert(s, SSL3_AL_FATAL, al);
err:
        *ok = 0;
        return (-1);
}

int
ssl_cert_type(X509 *x, EVP_PKEY *pkey)
{
        EVP_PKEY *pk;
        int ret = -1, i;

        if (pkey == NULL)
                pk = X509_get_pubkey(x);
        else
                pk = pkey;
        if (pk == NULL)
                goto err;

        i = pk->type;
        if (i == EVP_PKEY_RSA) {
                ret = SSL_PKEY_RSA_ENC;
        } else if (i == EVP_PKEY_EC) {
                ret = SSL_PKEY_ECC;
        } else if (i == NID_id_GostR3410_2001 ||
            i == NID_id_GostR3410_2001_cc) {
                ret = SSL_PKEY_GOST01;
        }

err:
        if (!pkey)
                EVP_PKEY_free(pk);
        return (ret);
}

int
ssl_verify_alarm_type(long type)
{
        int al;

        switch (type) {
        case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
        case X509_V_ERR_UNABLE_TO_GET_CRL:
        case X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER:
                al = SSL_AD_UNKNOWN_CA;
                break;
        case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE:
        case X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE:
        case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY:
        case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
        case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
        case X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD:
        case X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD:
        case X509_V_ERR_CERT_NOT_YET_VALID:
        case X509_V_ERR_CRL_NOT_YET_VALID:
        case X509_V_ERR_CERT_UNTRUSTED:
        case X509_V_ERR_CERT_REJECTED:
                al = SSL_AD_BAD_CERTIFICATE;
                break;
        case X509_V_ERR_CERT_SIGNATURE_FAILURE:
        case X509_V_ERR_CRL_SIGNATURE_FAILURE:
                al = SSL_AD_DECRYPT_ERROR;
                break;
        case X509_V_ERR_CERT_HAS_EXPIRED:
        case X509_V_ERR_CRL_HAS_EXPIRED:
                al = SSL_AD_CERTIFICATE_EXPIRED;
                break;
        case X509_V_ERR_CERT_REVOKED:
                al = SSL_AD_CERTIFICATE_REVOKED;
                break;
        case X509_V_ERR_OUT_OF_MEM:
                al = SSL_AD_INTERNAL_ERROR;
                break;
        case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
        case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
        case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
        case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE:
        case X509_V_ERR_CERT_CHAIN_TOO_LONG:
        case X509_V_ERR_PATH_LENGTH_EXCEEDED:
        case X509_V_ERR_INVALID_CA:
                al = SSL_AD_UNKNOWN_CA;
                break;
        case X509_V_ERR_APPLICATION_VERIFICATION:
                al = SSL_AD_HANDSHAKE_FAILURE;
                break;
        case X509_V_ERR_INVALID_PURPOSE:
                al = SSL_AD_UNSUPPORTED_CERTIFICATE;
                break;
        default:
                al = SSL_AD_CERTIFICATE_UNKNOWN;
                break;
        }
        return (al);
}

int
ssl3_setup_init_buffer(SSL *s)
{
        BUF_MEM *buf = NULL;

        if (s->internal->init_buf != NULL)
                return (1);

        if ((buf = BUF_MEM_new()) == NULL)
                goto err;
        if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH))
                goto err;

        s->internal->init_buf = buf;
        return (1);

err:
        BUF_MEM_free(buf);
        return (0);
}

int
ssl3_setup_read_buffer(SSL *s)
{
        unsigned char *p;
        size_t len, align, headerlen;

        if (SSL_IS_DTLS(s))
                headerlen = DTLS1_RT_HEADER_LENGTH;
        else
                headerlen = SSL3_RT_HEADER_LENGTH;

        align = (-SSL3_RT_HEADER_LENGTH) & (SSL3_ALIGN_PAYLOAD - 1);

        if (s->s3->rbuf.buf == NULL) {
                len = SSL3_RT_MAX_PLAIN_LENGTH +
                    SSL3_RT_MAX_ENCRYPTED_OVERHEAD + headerlen + align;
                if ((p = malloc(len)) == NULL)
                        goto err;
                s->s3->rbuf.buf = p;
                s->s3->rbuf.len = len;
        }

        s->internal->packet = &(s->s3->rbuf.buf[0]);
        return 1;

err:
        SSLerror(s, ERR_R_MALLOC_FAILURE);
        return 0;
}

int
ssl3_setup_write_buffer(SSL *s)
{
        unsigned char *p;
        size_t len, align, headerlen;

        if (SSL_IS_DTLS(s))
                headerlen = DTLS1_RT_HEADER_LENGTH + 1;
        else
                headerlen = SSL3_RT_HEADER_LENGTH;

        align = (-SSL3_RT_HEADER_LENGTH) & (SSL3_ALIGN_PAYLOAD - 1);

        if (s->s3->wbuf.buf == NULL) {
                len = s->max_send_fragment +
                    SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD + headerlen + align;
                if (!(s->internal->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS))
                        len += headerlen + align +
                            SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD;

                if ((p = malloc(len)) == NULL)
                        goto err;
                s->s3->wbuf.buf = p;
                s->s3->wbuf.len = len;
        }

        return 1;

err:
        SSLerror(s, ERR_R_MALLOC_FAILURE);
        return 0;
}

int
ssl3_setup_buffers(SSL *s)
{
        if (!ssl3_setup_read_buffer(s))
                return 0;
        if (!ssl3_setup_write_buffer(s))
                return 0;
        return 1;
}

int
ssl3_release_write_buffer(SSL *s)
{
        free(s->s3->wbuf.buf);
        s->s3->wbuf.buf = NULL;
        return 1;
}

int
ssl3_release_read_buffer(SSL *s)
{
        free(s->s3->rbuf.buf);
        s->s3->rbuf.buf = NULL;
        return 1;
}