mirror of
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526 lines
12 KiB
C
526 lines
12 KiB
C
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/* $OpenBSD: tls13_legacy.c,v 1.13 2020/09/13 15:04:35 jsing Exp $ */
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/*
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* Copyright (c) 2018, 2019 Joel Sing <jsing@openbsd.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <limits.h>
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#include "ssl_locl.h"
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#include "tls13_internal.h"
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SSL3_ENC_METHOD TLSv1_3_enc_data = {
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.enc_flags = SSL_ENC_FLAG_SIGALGS|SSL_ENC_FLAG_TLS1_3_CIPHERS,
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};
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static ssize_t
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tls13_legacy_wire_read(SSL *ssl, uint8_t *buf, size_t len)
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{
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int n;
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if (ssl->rbio == NULL) {
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SSLerror(ssl, SSL_R_BIO_NOT_SET);
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return TLS13_IO_FAILURE;
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}
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ssl->internal->rwstate = SSL_READING;
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errno = 0;
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if ((n = BIO_read(ssl->rbio, buf, len)) <= 0) {
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if (BIO_should_read(ssl->rbio))
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return TLS13_IO_WANT_POLLIN;
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if (BIO_should_write(ssl->rbio))
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return TLS13_IO_WANT_POLLOUT;
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if (n == 0)
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return TLS13_IO_EOF;
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if (ERR_peek_error() == 0 && errno != 0)
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SYSerror(errno);
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return TLS13_IO_FAILURE;
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}
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if (n == len)
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ssl->internal->rwstate = SSL_NOTHING;
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return n;
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}
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ssize_t
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tls13_legacy_wire_read_cb(void *buf, size_t n, void *arg)
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{
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struct tls13_ctx *ctx = arg;
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return tls13_legacy_wire_read(ctx->ssl, buf, n);
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}
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static ssize_t
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tls13_legacy_wire_write(SSL *ssl, const uint8_t *buf, size_t len)
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{
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int n;
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if (ssl->wbio == NULL) {
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SSLerror(ssl, SSL_R_BIO_NOT_SET);
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return TLS13_IO_FAILURE;
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}
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ssl->internal->rwstate = SSL_WRITING;
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errno = 0;
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if ((n = BIO_write(ssl->wbio, buf, len)) <= 0) {
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if (BIO_should_read(ssl->wbio))
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return TLS13_IO_WANT_POLLIN;
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if (BIO_should_write(ssl->wbio))
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return TLS13_IO_WANT_POLLOUT;
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if (ERR_peek_error() == 0 && errno != 0)
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SYSerror(errno);
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return TLS13_IO_FAILURE;
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}
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if (n == len)
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ssl->internal->rwstate = SSL_NOTHING;
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return n;
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}
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ssize_t
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tls13_legacy_wire_write_cb(const void *buf, size_t n, void *arg)
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{
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struct tls13_ctx *ctx = arg;
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return tls13_legacy_wire_write(ctx->ssl, buf, n);
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}
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static void
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tls13_legacy_error(SSL *ssl)
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{
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struct tls13_ctx *ctx = ssl->internal->tls13;
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int reason = SSL_R_UNKNOWN;
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/* If we received a fatal alert we already put an error on the stack. */
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if (S3I(ssl)->fatal_alert != 0)
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return;
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switch (ctx->error.code) {
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case TLS13_ERR_VERIFY_FAILED:
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reason = SSL_R_CERTIFICATE_VERIFY_FAILED;
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break;
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case TLS13_ERR_HRR_FAILED:
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reason = SSL_R_NO_CIPHERS_AVAILABLE;
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break;
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case TLS13_ERR_TRAILING_DATA:
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reason = SSL_R_EXTRA_DATA_IN_MESSAGE;
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break;
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case TLS13_ERR_NO_SHARED_CIPHER:
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reason = SSL_R_NO_SHARED_CIPHER;
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break;
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case TLS13_ERR_NO_CERTIFICATE:
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reason = SSL_R_MISSING_RSA_CERTIFICATE; /* XXX */
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break;
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case TLS13_ERR_NO_PEER_CERTIFICATE:
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reason = SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE;
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break;
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}
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/* Something (probably libcrypto) already pushed an error on the stack. */
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if (reason == SSL_R_UNKNOWN && ERR_peek_error() != 0)
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return;
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ERR_put_error(ERR_LIB_SSL, (0xfff), reason, ctx->error.file,
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ctx->error.line);
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}
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int
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tls13_legacy_return_code(SSL *ssl, ssize_t ret)
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{
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if (ret > INT_MAX) {
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SSLerror(ssl, ERR_R_INTERNAL_ERROR);
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return -1;
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}
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/* A successful read, write or other operation. */
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if (ret > 0)
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return ret;
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ssl->internal->rwstate = SSL_NOTHING;
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switch (ret) {
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case TLS13_IO_EOF:
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return 0;
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case TLS13_IO_FAILURE:
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tls13_legacy_error(ssl);
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return -1;
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case TLS13_IO_ALERT:
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tls13_legacy_error(ssl);
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return -1;
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case TLS13_IO_WANT_POLLIN:
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BIO_set_retry_read(ssl->rbio);
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ssl->internal->rwstate = SSL_READING;
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return -1;
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case TLS13_IO_WANT_POLLOUT:
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BIO_set_retry_write(ssl->wbio);
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ssl->internal->rwstate = SSL_WRITING;
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return -1;
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case TLS13_IO_WANT_RETRY:
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SSLerror(ssl, ERR_R_INTERNAL_ERROR);
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return -1;
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}
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SSLerror(ssl, ERR_R_INTERNAL_ERROR);
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return -1;
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}
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int
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tls13_legacy_pending(const SSL *ssl)
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{
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struct tls13_ctx *ctx = ssl->internal->tls13;
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ssize_t ret;
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if (ctx == NULL)
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return 0;
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ret = tls13_pending_application_data(ctx->rl);
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if (ret < 0 || ret > INT_MAX)
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return 0;
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return ret;
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}
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int
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tls13_legacy_read_bytes(SSL *ssl, int type, unsigned char *buf, int len, int peek)
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{
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struct tls13_ctx *ctx = ssl->internal->tls13;
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ssize_t ret;
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if (ctx == NULL || !ctx->handshake_completed) {
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if ((ret = ssl->internal->handshake_func(ssl)) <= 0)
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return ret;
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return tls13_legacy_return_code(ssl, TLS13_IO_WANT_POLLIN);
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}
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tls13_record_layer_set_retry_after_phh(ctx->rl,
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(ctx->ssl->internal->mode & SSL_MODE_AUTO_RETRY) != 0);
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if (type != SSL3_RT_APPLICATION_DATA) {
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SSLerror(ssl, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
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return -1;
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}
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if (len < 0) {
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SSLerror(ssl, SSL_R_BAD_LENGTH);
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return -1;
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}
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if (peek)
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ret = tls13_peek_application_data(ctx->rl, buf, len);
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else
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ret = tls13_read_application_data(ctx->rl, buf, len);
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return tls13_legacy_return_code(ssl, ret);
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}
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int
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tls13_legacy_write_bytes(SSL *ssl, int type, const void *vbuf, int len)
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{
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struct tls13_ctx *ctx = ssl->internal->tls13;
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const uint8_t *buf = vbuf;
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size_t n, sent;
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ssize_t ret;
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if (ctx == NULL || !ctx->handshake_completed) {
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if ((ret = ssl->internal->handshake_func(ssl)) <= 0)
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return ret;
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return tls13_legacy_return_code(ssl, TLS13_IO_WANT_POLLOUT);
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}
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if (type != SSL3_RT_APPLICATION_DATA) {
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SSLerror(ssl, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
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return -1;
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}
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if (len < 0) {
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SSLerror(ssl, SSL_R_BAD_LENGTH);
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return -1;
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}
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/*
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* The TLSv1.3 record layer write behaviour is the same as
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* SSL_MODE_ENABLE_PARTIAL_WRITE.
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*/
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if (ssl->internal->mode & SSL_MODE_ENABLE_PARTIAL_WRITE) {
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ret = tls13_write_application_data(ctx->rl, buf, len);
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return tls13_legacy_return_code(ssl, ret);
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}
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/*
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* In the non-SSL_MODE_ENABLE_PARTIAL_WRITE case we have to loop until
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* we have written out all of the requested data.
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*/
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sent = S3I(ssl)->wnum;
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if (len < sent) {
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SSLerror(ssl, SSL_R_BAD_LENGTH);
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return -1;
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}
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n = len - sent;
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for (;;) {
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if (n == 0) {
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S3I(ssl)->wnum = 0;
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return sent;
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}
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if ((ret = tls13_write_application_data(ctx->rl,
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&buf[sent], n)) <= 0) {
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S3I(ssl)->wnum = sent;
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return tls13_legacy_return_code(ssl, ret);
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}
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sent += ret;
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n -= ret;
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}
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}
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static int
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tls13_use_legacy_stack(struct tls13_ctx *ctx)
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{
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SSL *s = ctx->ssl;
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CBS cbs;
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if (!ssl3_setup_init_buffer(s))
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return 0;
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if (!ssl3_setup_buffers(s))
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return 0;
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if (!ssl_init_wbio_buffer(s, 1))
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return 0;
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/* Stash any unprocessed data from the last record. */
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tls13_record_layer_rbuf(ctx->rl, &cbs);
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if (CBS_len(&cbs) > 0) {
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if (!CBS_write_bytes(&cbs,
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S3I(s)->rbuf.buf + SSL3_RT_HEADER_LENGTH,
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S3I(s)->rbuf.len - SSL3_RT_HEADER_LENGTH, NULL))
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return 0;
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S3I(s)->rbuf.offset = SSL3_RT_HEADER_LENGTH;
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S3I(s)->rbuf.left = CBS_len(&cbs);
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S3I(s)->rrec.type = SSL3_RT_HANDSHAKE;
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S3I(s)->rrec.length = CBS_len(&cbs);
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s->internal->rstate = SSL_ST_READ_BODY;
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s->internal->packet = S3I(s)->rbuf.buf;
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s->internal->packet_length = SSL3_RT_HEADER_LENGTH;
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s->internal->mac_packet = 1;
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}
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/* Stash the current handshake message. */
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tls13_handshake_msg_data(ctx->hs_msg, &cbs);
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if (!CBS_write_bytes(&cbs, s->internal->init_buf->data,
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s->internal->init_buf->length, NULL))
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return 0;
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S3I(s)->tmp.reuse_message = 1;
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S3I(s)->tmp.message_type = tls13_handshake_msg_type(ctx->hs_msg);
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S3I(s)->tmp.message_size = CBS_len(&cbs);
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return 1;
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}
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int
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tls13_use_legacy_client(struct tls13_ctx *ctx)
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{
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SSL *s = ctx->ssl;
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s->method = tls_legacy_client_method();
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s->internal->handshake_func = s->method->internal->ssl_connect;
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s->client_version = s->version = s->method->internal->max_version;
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if (!tls13_use_legacy_stack(ctx))
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return 0;
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S3I(s)->hs.state = SSL3_ST_CR_SRVR_HELLO_A;
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return 1;
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}
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int
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tls13_use_legacy_server(struct tls13_ctx *ctx)
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{
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SSL *s = ctx->ssl;
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s->method = tls_legacy_server_method();
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s->internal->handshake_func = s->method->internal->ssl_accept;
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s->client_version = s->version = s->method->internal->max_version;
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s->server = 1;
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if (!tls13_use_legacy_stack(ctx))
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return 0;
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S3I(s)->hs.state = SSL3_ST_SR_CLNT_HELLO_A;
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return 1;
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}
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int
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tls13_legacy_accept(SSL *ssl)
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{
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struct tls13_ctx *ctx = ssl->internal->tls13;
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int ret;
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if (ctx == NULL) {
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if ((ctx = tls13_ctx_new(TLS13_HS_SERVER)) == NULL) {
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SSLerror(ssl, ERR_R_INTERNAL_ERROR); /* XXX */
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return -1;
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}
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ssl->internal->tls13 = ctx;
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ctx->ssl = ssl;
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ctx->hs = &S3I(ssl)->hs_tls13;
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if (!tls13_server_init(ctx)) {
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if (ERR_peek_error() == 0)
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SSLerror(ssl, ERR_R_INTERNAL_ERROR); /* XXX */
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return -1;
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}
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}
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ERR_clear_error();
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S3I(ssl)->hs.state = SSL_ST_ACCEPT;
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ret = tls13_server_accept(ctx);
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if (ret == TLS13_IO_USE_LEGACY)
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return ssl->method->internal->ssl_accept(ssl);
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if (ret == TLS13_IO_SUCCESS)
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S3I(ssl)->hs.state = SSL_ST_OK;
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return tls13_legacy_return_code(ssl, ret);
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}
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int
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tls13_legacy_connect(SSL *ssl)
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{
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struct tls13_ctx *ctx = ssl->internal->tls13;
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int ret;
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#ifdef TLS13_USE_LEGACY_CLIENT_AUTH
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/* XXX drop back to legacy for client auth for now */
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if (ssl->cert->key->privatekey != NULL) {
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ssl->method = tls_legacy_client_method();
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return ssl->method->internal->ssl_connect(ssl);
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}
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#endif
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if (ctx == NULL) {
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if ((ctx = tls13_ctx_new(TLS13_HS_CLIENT)) == NULL) {
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SSLerror(ssl, ERR_R_INTERNAL_ERROR); /* XXX */
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return -1;
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}
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ssl->internal->tls13 = ctx;
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ctx->ssl = ssl;
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ctx->hs = &S3I(ssl)->hs_tls13;
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if (!tls13_client_init(ctx)) {
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if (ERR_peek_error() == 0)
|
||
|
SSLerror(ssl, ERR_R_INTERNAL_ERROR); /* XXX */
|
||
|
return -1;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
ERR_clear_error();
|
||
|
S3I(ssl)->hs.state = SSL_ST_CONNECT;
|
||
|
|
||
|
ret = tls13_client_connect(ctx);
|
||
|
if (ret == TLS13_IO_USE_LEGACY)
|
||
|
return ssl->method->internal->ssl_connect(ssl);
|
||
|
if (ret == TLS13_IO_SUCCESS)
|
||
|
S3I(ssl)->hs.state = SSL_ST_OK;
|
||
|
|
||
|
return tls13_legacy_return_code(ssl, ret);
|
||
|
}
|
||
|
|
||
|
int
|
||
|
tls13_legacy_shutdown(SSL *ssl)
|
||
|
{
|
||
|
struct tls13_ctx *ctx = ssl->internal->tls13;
|
||
|
uint8_t buf[512]; /* XXX */
|
||
|
ssize_t ret;
|
||
|
|
||
|
/*
|
||
|
* We need to return 0 when we have sent a close-notify but have not
|
||
|
* yet received one. We return 1 only once we have sent and received
|
||
|
* close-notify alerts. All other cases return -1 and set internal
|
||
|
* state appropriately.
|
||
|
*/
|
||
|
if (ctx == NULL || ssl->internal->quiet_shutdown) {
|
||
|
ssl->internal->shutdown = SSL_SENT_SHUTDOWN | SSL_RECEIVED_SHUTDOWN;
|
||
|
return 1;
|
||
|
}
|
||
|
|
||
|
if (!ctx->close_notify_sent) {
|
||
|
/* Enqueue and send close notify. */
|
||
|
if (!(ssl->internal->shutdown & SSL_SENT_SHUTDOWN)) {
|
||
|
ssl->internal->shutdown |= SSL_SENT_SHUTDOWN;
|
||
|
if ((ret = tls13_send_alert(ctx->rl,
|
||
|
TLS13_ALERT_CLOSE_NOTIFY)) < 0)
|
||
|
return tls13_legacy_return_code(ssl, ret);
|
||
|
}
|
||
|
if ((ret = tls13_record_layer_send_pending(ctx->rl)) !=
|
||
|
TLS13_IO_SUCCESS)
|
||
|
return tls13_legacy_return_code(ssl, ret);
|
||
|
} else if (!ctx->close_notify_recv) {
|
||
|
/*
|
||
|
* If there is no application data pending, attempt to read more
|
||
|
* data in order to receive a close notify. This should trigger
|
||
|
* a record to be read from the wire, which may be application
|
||
|
* handshake or alert data. Only one attempt is made to match
|
||
|
* previous semantics.
|
||
|
*/
|
||
|
if (tls13_pending_application_data(ctx->rl) == 0) {
|
||
|
if ((ret = tls13_read_application_data(ctx->rl, buf,
|
||
|
sizeof(buf))) < 0)
|
||
|
return tls13_legacy_return_code(ssl, ret);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
if (ctx->close_notify_recv)
|
||
|
return 1;
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
int
|
||
|
tls13_legacy_servername_process(struct tls13_ctx *ctx, uint8_t *alert)
|
||
|
{
|
||
|
int legacy_alert = SSL_AD_UNRECOGNIZED_NAME;
|
||
|
int ret = SSL_TLSEXT_ERR_NOACK;
|
||
|
SSL_CTX *ssl_ctx = ctx->ssl->ctx;
|
||
|
SSL *ssl = ctx->ssl;
|
||
|
|
||
|
if (ssl_ctx->internal->tlsext_servername_callback == NULL)
|
||
|
ssl_ctx = ssl->initial_ctx;
|
||
|
if (ssl_ctx->internal->tlsext_servername_callback == NULL)
|
||
|
return 1;
|
||
|
|
||
|
ret = ssl_ctx->internal->tlsext_servername_callback(ssl, &legacy_alert,
|
||
|
ssl_ctx->internal->tlsext_servername_arg);
|
||
|
|
||
|
if (ret == SSL_TLSEXT_ERR_ALERT_FATAL ||
|
||
|
ret == SSL_TLSEXT_ERR_ALERT_WARNING) {
|
||
|
if (legacy_alert >= 0 && legacy_alert <= 255)
|
||
|
*alert = legacy_alert;
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
return 1;
|
||
|
}
|