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Remove GOST and STREEBOG support from libssl.

This version of GOST is old and not anywhere close to compliant with
modern GOST standards. It is also very intrusive in libssl and
makes a mess everywhere.  Efforts to entice a suitably minded anyone
to care about it have been unsuccessful.

At this point it is probably best to remove this, and if someone
ever showed up who truly needed a working version, it should be
a clean implementation from scratch, and have it use something
closer to the typical API in libcrypto so it would integrate less
painfully here.

This removes it from libssl in preparation for it's removal from
libcrypto with a future major bump

ok tb@

/* $OpenBSD: ssl_both.c,v 1.47 2024/02/03 15:58:33 beck 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 <openssl/buffer.h>
#include <openssl/evp.h>
#include <openssl/objects.h>
#include <openssl/x509.h>

#include "bytestring.h"
#include "dtls_local.h"
#include "ssl_local.h"

/*
 * Send s->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->init_buf->data[s->init_off],
	    s->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_transcript_record(s,
		    (unsigned char *)&s->init_buf->data[s->init_off], ret);

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

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

	return (0);
}

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, SSL_CERT_PKEY *cpk)
{
	X509_STORE_CTX *xs_ctx = NULL;
	STACK_OF(X509) *chain;
	CBB cert_list;
	X509 *x;
	int ret = 0;
	int i;

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

	/* Send an empty certificate list when no certificate is available. */
	if (cpk == NULL)
		goto done;

	if ((chain = cpk->chain) == NULL)
		chain = s->ctx->extra_certs;

	if (chain != NULL || (s->mode & SSL_MODE_NO_AUTO_CHAIN)) {
		if (!ssl3_add_cert(&cert_list, cpk->x509))
			goto err;
	} else {
		if ((xs_ctx = X509_STORE_CTX_new()) == NULL)
			goto err;
		if (!X509_STORE_CTX_init(xs_ctx, s->ctx->cert_store,
		    cpk->x509, NULL)) {
			SSLerror(s, ERR_R_X509_LIB);
			goto err;
		}
		X509_VERIFY_PARAM_set_flags(X509_STORE_CTX_get0_param(xs_ctx),
		    X509_V_FLAG_LEGACY_VERIFY);
		X509_verify_cert(xs_ctx);
		ERR_clear_error();
		chain = X509_STORE_CTX_get0_chain(xs_ctx);
	}

	for (i = 0; i < sk_X509_num(chain); i++) {
		x = sk_X509_value(chain, i);
		if (!ssl3_add_cert(&cert_list, x))
			goto err;
	}

 done:
	if (!CBB_flush(cbb))
		goto err;

	ret = 1;

 err:
	X509_STORE_CTX_free(xs_ctx);

	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'.
 */
int
ssl3_get_message(SSL *s, int st1, int stn, int mt, long max)
{
	unsigned char *p;
	uint32_t l;
	long n;
	int i, al;
	CBS cbs;
	uint8_t u8;

	if (SSL_is_dtls(s))
		return dtls1_get_message(s, st1, stn, mt, max);

	if (s->s3->hs.tls12.reuse_message) {
		s->s3->hs.tls12.reuse_message = 0;
		if ((mt >= 0) && (s->s3->hs.tls12.message_type != mt)) {
			al = SSL_AD_UNEXPECTED_MESSAGE;
			SSLerror(s, SSL_R_UNEXPECTED_MESSAGE);
			goto fatal_err;
		}
		s->init_msg = s->init_buf->data +
		    SSL3_HM_HEADER_LENGTH;
		s->init_num = (int)s->s3->hs.tls12.message_size;
		return 1;
	}

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

	if (s->s3->hs.state == st1) {
		int skip_message;

		do {
			while (s->init_num < SSL3_HM_HEADER_LENGTH) {
				i = s->method->ssl_read_bytes(s,
				    SSL3_RT_HANDSHAKE, &p[s->init_num],
				    SSL3_HM_HEADER_LENGTH - s->init_num, 0);
				if (i <= 0) {
					s->rwstate = SSL_READING;
					return i;
				}
				s->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->init_num = 0;
					skip_message = 1;

					ssl_msg_callback(s, 0,
					    SSL3_RT_HANDSHAKE, p,
					    SSL3_HM_HEADER_LENGTH);
				}
			}
		} while (skip_message);

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

		CBS_init(&cbs, p, SSL3_HM_HEADER_LENGTH);
		if (!CBS_get_u8(&cbs, &u8) ||
		    !CBS_get_u24(&cbs, &l)) {
			SSLerror(s, ERR_R_BUF_LIB);
			goto err;
		}
		s->s3->hs.tls12.message_type = u8;

		if (l > (unsigned long)max) {
			al = SSL_AD_ILLEGAL_PARAMETER;
			SSLerror(s, SSL_R_EXCESSIVE_MESSAGE_SIZE);
			goto fatal_err;
		}
		if (l && !BUF_MEM_grow_clean(s->init_buf,
		    l + SSL3_HM_HEADER_LENGTH)) {
			SSLerror(s, ERR_R_BUF_LIB);
			goto err;
		}
		s->s3->hs.tls12.message_size = l;
		s->s3->hs.state = stn;

		s->init_msg = s->init_buf->data +
		    SSL3_HM_HEADER_LENGTH;
		s->init_num = 0;
	}

	/* next state (stn) */
	p = s->init_msg;
	n = s->s3->hs.tls12.message_size - s->init_num;
	while (n > 0) {
		i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE,
		    &p[s->init_num], n, 0);
		if (i <= 0) {
			s->rwstate = SSL_READING;
			return i;
		}
		s->init_num += i;
		n -= i;
	}

	/* Feed this message into MAC computation. */
	if (s->mac_packet) {
		tls1_transcript_record(s, (unsigned char *)s->init_buf->data,
		    s->init_num + SSL3_HM_HEADER_LENGTH);

		ssl_msg_callback(s, 0, SSL3_RT_HANDSHAKE,
		    s->init_buf->data,
		    (size_t)s->init_num + SSL3_HM_HEADER_LENGTH);
	}

	return 1;

 fatal_err:
	ssl3_send_alert(s, SSL3_AL_FATAL, al);
 err:
	return -1;
}

int
ssl_cert_type(EVP_PKEY *pkey)
{
	if (pkey == NULL)
		return -1;

	switch (EVP_PKEY_id(pkey)) {
	case EVP_PKEY_EC:
		return SSL_PKEY_ECC;
	case EVP_PKEY_RSA:
	case EVP_PKEY_RSA_PSS:
		return SSL_PKEY_RSA;
	}

	return -1;
}

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

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

void
ssl3_release_init_buffer(SSL *s)
{
	BUF_MEM_free(s->init_buf);
	s->init_buf = NULL;
	s->init_msg = NULL;
	s->init_num = 0;
	s->init_off = 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 = calloc(1, len)) == NULL)
			goto err;
		s->s3->rbuf.buf = p;
		s->s3->rbuf.len = len;
	}

	s->packet = s->s3->rbuf.buf;
	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->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS))
			len += headerlen + align +
			    SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD;

		if ((p = calloc(1, 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;
}

void
ssl3_release_buffer(SSL3_BUFFER_INTERNAL *b)
{
	freezero(b->buf, b->len);
	b->buf = NULL;
	b->len = 0;
}

void
ssl3_release_read_buffer(SSL *s)
{
	ssl3_release_buffer(&s->s3->rbuf);
}

void
ssl3_release_write_buffer(SSL *s)
{
	ssl3_release_buffer(&s->s3->wbuf);
}