/* ssl/bio_ssl.c */

/* 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.]

 */

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <errno.h>

#include <openssl/crypto.h>

#include <openssl/bio.h>

#include <openssl/err.h>

#include <openssl/ssl.h>

static int ssl_write(BIO *h, const char *buf, int num);

static int ssl_read(BIO *h, char *buf, int size);

static int ssl_puts(BIO *h, const char *str);

static long ssl_ctrl(BIO *h, int cmd, long arg1, void *arg2);

static int ssl_new(BIO *h);

static int ssl_free(BIO *data);

static long ssl_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp);

typedef struct bio_ssl_st {

    SSL *ssl;                   /* The ssl handle :-) */

    /* re-negotiate every time the total number of bytes is this size */

    int num_renegotiates;

    unsigned long renegotiate_count;

    unsigned long byte_count;

    unsigned long renegotiate_timeout;

    unsigned long last_time;

} BIO_SSL;

static BIO_METHOD methods_sslp = {

    BIO_TYPE_SSL, "ssl",

    ssl_write,

    ssl_read,

    ssl_puts,

    NULL,                       /* ssl_gets, */

    ssl_ctrl,

    ssl_new,

    ssl_free,

    ssl_callback_ctrl,

};

BIO_METHOD *BIO_f_ssl(void)

{

    return (&methods_sslp);

}

static int ssl_new(BIO *bi)

{

    BIO_SSL *bs;

    bs = (BIO_SSL *)OPENSSL_malloc(sizeof(BIO_SSL));

    if (bs == NULL) {

        BIOerr(BIO_F_SSL_NEW, ERR_R_MALLOC_FAILURE);

        return (0);

    }

    memset(bs, 0, sizeof(BIO_SSL));

    bi->init = 0;

    bi->ptr = (char *)bs;

    bi->flags = 0;

    return (1);

}

static int ssl_free(BIO *a)

{

    BIO_SSL *bs;

    if (a == NULL)

        return (0);

    bs = (BIO_SSL *)a->ptr;

    if (bs->ssl != NULL)

        SSL_shutdown(bs->ssl);

    if (a->shutdown) {

        if (a->init && (bs->ssl != NULL))

            SSL_free(bs->ssl);

        a->init = 0;

        a->flags = 0;

    }

    if (a->ptr != NULL)

        OPENSSL_free(a->ptr);

    return (1);

}

static int ssl_read(BIO *b, char *out, int outl)

{

    int ret = 1;

    BIO_SSL *sb;

    SSL *ssl;

    int retry_reason = 0;

    int r = 0;

    if (out == NULL)

        return (0);

    sb = (BIO_SSL *)b->ptr;

    ssl = sb->ssl;

    BIO_clear_retry_flags(b);

#if 0

    if (!SSL_is_init_finished(ssl)) {

/*              ret=SSL_do_handshake(ssl); */

        if (ret > 0) {

            outflags = (BIO_FLAGS_READ | BIO_FLAGS_SHOULD_RETRY);

            ret = -1;

            goto end;

        }

    }

#endif

/*      if (ret > 0) */

    ret = SSL_read(ssl, out, outl);

    switch (SSL_get_error(ssl, ret)) {

    case SSL_ERROR_NONE:

        if (ret <= 0)

            break;

        if (sb->renegotiate_count > 0) {

            sb->byte_count += ret;

            if (sb->byte_count > sb->renegotiate_count) {

                sb->byte_count = 0;

                sb->num_renegotiates++;

                SSL_renegotiate(ssl);

                r = 1;

            }

        }

        if ((sb->renegotiate_timeout > 0) && (!r)) {

            unsigned long tm;

            tm = (unsigned long)time(NULL);

            if (tm > sb->last_time + sb->renegotiate_timeout) {

                sb->last_time = tm;

                sb->num_renegotiates++;

                SSL_renegotiate(ssl);

            }

        }

        break;

    case SSL_ERROR_WANT_READ:

        BIO_set_retry_read(b);

        break;

    case SSL_ERROR_WANT_WRITE:

        BIO_set_retry_write(b);

        break;

    case SSL_ERROR_WANT_X509_LOOKUP:

        BIO_set_retry_special(b);

        retry_reason = BIO_RR_SSL_X509_LOOKUP;

        break;

    case SSL_ERROR_WANT_ACCEPT:

        BIO_set_retry_special(b);

        retry_reason = BIO_RR_ACCEPT;

        break;

    case SSL_ERROR_WANT_CONNECT:

        BIO_set_retry_special(b);

        retry_reason = BIO_RR_CONNECT;

        break;

    case SSL_ERROR_SYSCALL:

    case SSL_ERROR_SSL:

    case SSL_ERROR_ZERO_RETURN:

    default:

        break;

    }

    b->retry_reason = retry_reason;

    return (ret);

}

static int ssl_write(BIO *b, const char *out, int outl)

{

    int ret, r = 0;

    int retry_reason = 0;

    SSL *ssl;

    BIO_SSL *bs;

    if (out == NULL)

        return (0);

    bs = (BIO_SSL *)b->ptr;

    ssl = bs->ssl;

    BIO_clear_retry_flags(b);

    /*

     * ret=SSL_do_handshake(ssl); if (ret > 0)

     */

    ret = SSL_write(ssl, out, outl);

    switch (SSL_get_error(ssl, ret)) {

    case SSL_ERROR_NONE:

        if (ret <= 0)

            break;

        if (bs->renegotiate_count > 0) {

            bs->byte_count += ret;

            if (bs->byte_count > bs->renegotiate_count) {

                bs->byte_count = 0;

                bs->num_renegotiates++;

                SSL_renegotiate(ssl);

                r = 1;

            }

        }

        if ((bs->renegotiate_timeout > 0) && (!r)) {

            unsigned long tm;

            tm = (unsigned long)time(NULL);

            if (tm > bs->last_time + bs->renegotiate_timeout) {

                bs->last_time = tm;

                bs->num_renegotiates++;

                SSL_renegotiate(ssl);

            }

        }

        break;

    case SSL_ERROR_WANT_WRITE:

        BIO_set_retry_write(b);

        break;

    case SSL_ERROR_WANT_READ:

        BIO_set_retry_read(b);

        break;

    case SSL_ERROR_WANT_X509_LOOKUP:

        BIO_set_retry_special(b);

        retry_reason = BIO_RR_SSL_X509_LOOKUP;

        break;

    case SSL_ERROR_WANT_CONNECT:

        BIO_set_retry_special(b);

        retry_reason = BIO_RR_CONNECT;

    case SSL_ERROR_SYSCALL:

    case SSL_ERROR_SSL:

    default:

        break;

    }

    b->retry_reason = retry_reason;

    return (ret);

}

static long ssl_ctrl(BIO *b, int cmd, long num, void *ptr)

{

    SSL **sslp, *ssl;

    BIO_SSL *bs;

    BIO *dbio, *bio;

    long ret = 1;

    bs = (BIO_SSL *)b->ptr;

    ssl = bs->ssl;

    if ((ssl == NULL) && (cmd != BIO_C_SET_SSL))

        return (0);

    switch (cmd) {

    case BIO_CTRL_RESET:

        SSL_shutdown(ssl);

        if (ssl->handshake_func == ssl->method->ssl_connect)

            SSL_set_connect_state(ssl);

        else if (ssl->handshake_func == ssl->method->ssl_accept)

            SSL_set_accept_state(ssl);

        SSL_clear(ssl);

        if (b->next_bio != NULL)

            ret = BIO_ctrl(b->next_bio, cmd, num, ptr);

        else if (ssl->rbio != NULL)

            ret = BIO_ctrl(ssl->rbio, cmd, num, ptr);

        else

            ret = 1;

        break;

    case BIO_CTRL_INFO:

        ret = 0;

        break;

    case BIO_C_SSL_MODE:

        if (num)                /* client mode */

            SSL_set_connect_state(ssl);

        else

            SSL_set_accept_state(ssl);

        break;

    case BIO_C_SET_SSL_RENEGOTIATE_TIMEOUT:

        ret = bs->renegotiate_timeout;

        if (num < 60)

            num = 5;

        bs->renegotiate_timeout = (unsigned long)num;

        bs->last_time = (unsigned long)time(NULL);

        break;

    case BIO_C_SET_SSL_RENEGOTIATE_BYTES:

        ret = bs->renegotiate_count;

        if ((long)num >= 512)

            bs->renegotiate_count = (unsigned long)num;

        break;

    case BIO_C_GET_SSL_NUM_RENEGOTIATES:

        ret = bs->num_renegotiates;

        break;

    case BIO_C_SET_SSL:

        if (ssl != NULL) {

            ssl_free(b);

            if (!ssl_new(b))

                return 0;

        }

        b->shutdown = (int)num;

        ssl = (SSL *)ptr;

        ((BIO_SSL *)b->ptr)->ssl = ssl;

        bio = SSL_get_rbio(ssl);

        if (bio != NULL) {

            if (b->next_bio != NULL)

                BIO_push(bio, b->next_bio);

            b->next_bio = bio;

            CRYPTO_add(&bio->references, 1, CRYPTO_LOCK_BIO);

        }

        b->init = 1;

        break;

    case BIO_C_GET_SSL:

        if (ptr != NULL) {

            sslp = (SSL **)ptr;

            *sslp = ssl;

        } else

            ret = 0;

        break;

    case BIO_CTRL_GET_CLOSE:

        ret = b->shutdown;

        break;

    case BIO_CTRL_SET_CLOSE:

        b->shutdown = (int)num;

        break;

    case BIO_CTRL_WPENDING:

        ret = BIO_ctrl(ssl->wbio, cmd, num, ptr);

        break;

    case BIO_CTRL_PENDING:

        ret = SSL_pending(ssl);

        if (ret == 0)

            ret = BIO_pending(ssl->rbio);

        break;

    case BIO_CTRL_FLUSH:

        BIO_clear_retry_flags(b);

        ret = BIO_ctrl(ssl->wbio, cmd, num, ptr);

        BIO_copy_next_retry(b);

        break;

    case BIO_CTRL_PUSH:

        if ((b->next_bio != NULL) && (b->next_bio != ssl->rbio)) {

            SSL_set_bio(ssl, b->next_bio, b->next_bio);

            CRYPTO_add(&b->next_bio->references, 1, CRYPTO_LOCK_BIO);

        }

        break;

    case BIO_CTRL_POP:

        /* Only detach if we are the BIO explicitly being popped */

        if (b == ptr) {

            /*

             * Shouldn't happen in practice because the rbio and wbio are the

             * same when pushed.

             */

            if (ssl->rbio != ssl->wbio)

                BIO_free_all(ssl->wbio);

            if (b->next_bio != NULL)

                CRYPTO_add(&b->next_bio->references, -1, CRYPTO_LOCK_BIO);

            ssl->wbio = NULL;

            ssl->rbio = NULL;

        }

        break;

    case BIO_C_DO_STATE_MACHINE:

        BIO_clear_retry_flags(b);

        b->retry_reason = 0;

        ret = (int)SSL_do_handshake(ssl);

        switch (SSL_get_error(ssl, (int)ret)) {

        case SSL_ERROR_WANT_READ:

            BIO_set_flags(b, BIO_FLAGS_READ | BIO_FLAGS_SHOULD_RETRY);

            break;

        case SSL_ERROR_WANT_WRITE:

            BIO_set_flags(b, BIO_FLAGS_WRITE | BIO_FLAGS_SHOULD_RETRY);

            break;

        case SSL_ERROR_WANT_CONNECT:

            BIO_set_flags(b, BIO_FLAGS_IO_SPECIAL | BIO_FLAGS_SHOULD_RETRY);

            b->retry_reason = b->next_bio->retry_reason;

            break;

        case SSL_ERROR_WANT_X509_LOOKUP:

            BIO_set_retry_special(b);

            b->retry_reason = BIO_RR_SSL_X509_LOOKUP;

            break;

        default:

            break;

        }

        break;

    case BIO_CTRL_DUP:

        dbio = (BIO *)ptr;

        if (((BIO_SSL *)dbio->ptr)->ssl != NULL)

            SSL_free(((BIO_SSL *)dbio->ptr)->ssl);

        ((BIO_SSL *)dbio->ptr)->ssl = SSL_dup(ssl);

        ((BIO_SSL *)dbio->ptr)->renegotiate_count =

            ((BIO_SSL *)b->ptr)->renegotiate_count;

        ((BIO_SSL *)dbio->ptr)->byte_count = ((BIO_SSL *)b->ptr)->byte_count;

        ((BIO_SSL *)dbio->ptr)->renegotiate_timeout =

            ((BIO_SSL *)b->ptr)->renegotiate_timeout;

        ((BIO_SSL *)dbio->ptr)->last_time = ((BIO_SSL *)b->ptr)->last_time;

        ret = (((BIO_SSL *)dbio->ptr)->ssl != NULL);

        break;

    case BIO_C_GET_FD:

        ret = BIO_ctrl(ssl->rbio, cmd, num, ptr);

        break;

    case BIO_CTRL_SET_CALLBACK:

        {

#if 0                           /* FIXME: Should this be used? -- Richard

                                 * Levitte */

            SSLerr(SSL_F_SSL_CTRL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);

            ret = -1;

#else

            ret = 0;

#endif

        }

        break;

    case BIO_CTRL_GET_CALLBACK:

        {

            void (**fptr) (const SSL *xssl, int type, int val);

            fptr = (void (**)(const SSL *xssl, int type, int val))ptr;

            *fptr = SSL_get_info_callback(ssl);

        }

        break;

    default:

        ret = BIO_ctrl(ssl->rbio, cmd, num, ptr);

        break;

    }

    return (ret);

}

static long ssl_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)

{

    SSL *ssl;

    BIO_SSL *bs;

    long ret = 1;

    bs = (BIO_SSL *)b->ptr;

    ssl = bs->ssl;

    switch (cmd) {

    case BIO_CTRL_SET_CALLBACK:

        {

            /*

             * FIXME: setting this via a completely different prototype seems

             * like a crap idea

             */

            SSL_set_info_callback(ssl, (void (*)(const SSL *, int, int))fp);

        }

        break;

    default:

        ret = BIO_callback_ctrl(ssl->rbio, cmd, fp);

        break;

    }

    return (ret);

}

static int ssl_puts(BIO *bp, const char *str)

{

    int n, ret;

    n = strlen(str);

    ret = BIO_write(bp, str, n);

    return (ret);

}

BIO *BIO_new_buffer_ssl_connect(SSL_CTX *ctx)

{

#ifndef OPENSSL_NO_SOCK

    BIO *ret = NULL, *buf = NULL, *ssl = NULL;

    if ((buf = BIO_new(BIO_f_buffer())) == NULL)

        return (NULL);

    if ((ssl = BIO_new_ssl_connect(ctx)) == NULL)

        goto err;

    if ((ret = BIO_push(buf, ssl)) == NULL)

        goto err;

    return (ret);

 err:

    if (buf != NULL)

        BIO_free(buf);

    if (ssl != NULL)

        BIO_free(ssl);

#endif

    return (NULL);

}

BIO *BIO_new_ssl_connect(SSL_CTX *ctx)

{

#ifndef OPENSSL_NO_SOCK

    BIO *ret = NULL, *con = NULL, *ssl = NULL;

    if ((con = BIO_new(BIO_s_connect())) == NULL)

        return (NULL);

    if ((ssl = BIO_new_ssl(ctx, 1)) == NULL)

        goto err;

    if ((ret = BIO_push(ssl, con)) == NULL)

        goto err;

    return (ret);

 err:

    if (con != NULL)

        BIO_free(con);

#endif

    return (NULL);

}

BIO *BIO_new_ssl(SSL_CTX *ctx, int client)

{

    BIO *ret;

    SSL *ssl;

    if ((ret = BIO_new(BIO_f_ssl())) == NULL)

        return (NULL);

    if ((ssl = SSL_new(ctx)) == NULL) {

        BIO_free(ret);

        return (NULL);

    }

    if (client)

        SSL_set_connect_state(ssl);

    else

        SSL_set_accept_state(ssl);

    BIO_set_ssl(ret, ssl, BIO_CLOSE);

    return (ret);

}

int BIO_ssl_copy_session_id(BIO *t, BIO *f)

{

    t = BIO_find_type(t, BIO_TYPE_SSL);

    f = BIO_find_type(f, BIO_TYPE_SSL);

    if ((t == NULL) || (f == NULL))

        return (0);

    if ((((BIO_SSL *)t->ptr)->ssl == NULL) ||

        (((BIO_SSL *)f->ptr)->ssl == NULL))

        return (0);

    SSL_copy_session_id(((BIO_SSL *)t->ptr)->ssl, ((BIO_SSL *)f->ptr)->ssl);

    return (1);

}

void BIO_ssl_shutdown(BIO *b)

{

    SSL *s;

    while (b != NULL) {

        if (b->method->type == BIO_TYPE_SSL) {

            s = ((BIO_SSL *)b->ptr)->ssl;

            SSL_shutdown(s);

            break;

        }

        b = b->next_bio;

    }

}