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/* Copyright (c) 2009-2018 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "istream-private.h"
#include "iostream-openssl.h"
struct ssl_istream {
struct istream_private istream;
struct ssl_iostream *ssl_io;
bool seen_eof;
};
static void i_stream_ssl_close(struct iostream_private *stream,
bool close_parent)
{
struct ssl_istream *sstream = (struct ssl_istream *)stream;
if (close_parent)
i_stream_close(sstream->ssl_io->plain_input);
}
static void i_stream_ssl_destroy(struct iostream_private *stream)
{
struct ssl_istream *sstream = (struct ssl_istream *)stream;
openssl_iostream_shutdown(sstream->ssl_io);
i_stream_free_buffer(&sstream->istream);
sstream->ssl_io->ssl_input = NULL;
ssl_iostream_unref(&sstream->ssl_io);
}
static ssize_t i_stream_ssl_read(struct istream_private *stream)
{
struct ssl_istream *sstream = (struct ssl_istream *)stream;
struct ssl_iostream *ssl_io = sstream->ssl_io;
size_t size;
ssize_t ret, total_ret;
if (sstream->seen_eof) {
stream->istream.eof = TRUE;
return -1;
}
if (!ssl_io->handshaked) {
if ((ret = ssl_iostream_handshake(ssl_io)) <= 0) {
if (ret < 0) {
/* handshake failed */
i_assert(errno != 0);
io_stream_set_error(&stream->iostream,
"%s", ssl_io->last_error);
stream->istream.stream_errno = errno;
}
return ret;
}
}
if (openssl_iostream_bio_sync(ssl_io,
OPENSSL_IOSTREAM_SYNC_TYPE_HANDSHAKE) < 0) {
i_assert(ssl_io->plain_stream_errno != 0 &&
ssl_io->plain_stream_errstr != NULL);
io_stream_set_error(&stream->iostream,
"%s", ssl_io->plain_stream_errstr);
stream->istream.stream_errno = ssl_io->plain_stream_errno;
return -1;
}
total_ret = 0;
for (;;) {
int pending = SSL_pending(ssl_io->ssl);
/* Allocate buffer space if needed. */
i_assert(stream->buffer_size >= stream->pos);
size = stream->buffer_size - stream->pos;
if ((pending > 0 || size == 0) &&
!i_stream_try_alloc(stream, I_MAX(pending, 1), &size)) {
if (total_ret > 0)
break;
return -2;
}
ret = SSL_read(ssl_io->ssl, stream->w_buffer + stream->pos, size);
if (ret <= 0) {
/* failed to read anything */
ret = openssl_iostream_handle_error(ssl_io, ret,
(total_ret == 0 ?
OPENSSL_IOSTREAM_SYNC_TYPE_CONTINUE_READ :
OPENSSL_IOSTREAM_SYNC_TYPE_NONE), "SSL_read");
if (ret <= 0) {
if (ret == 0)
break;
if (ssl_io->last_error != NULL) {
io_stream_set_error(&stream->iostream,
"%s", ssl_io->last_error);
}
if (errno != EPIPE)
stream->istream.stream_errno = errno;
stream->istream.eof = TRUE;
sstream->seen_eof = TRUE;
if (total_ret > 0)
break;
return -1;
}
/* we did some BIO I/O, try reading again */
continue;
}
stream->pos += ret;
total_ret += ret;
}
if (SSL_pending(ssl_io->ssl) > 0)
i_stream_set_input_pending(ssl_io->ssl_input, TRUE);
return total_ret;
}
struct istream *openssl_i_stream_create_ssl(struct ssl_iostream *ssl_io)
{
struct ssl_istream *sstream;
ssl_io->refcount++;
sstream = i_new(struct ssl_istream, 1);
sstream->ssl_io = ssl_io;
sstream->istream.iostream.close = i_stream_ssl_close;
sstream->istream.iostream.destroy = i_stream_ssl_destroy;
sstream->istream.max_buffer_size =
ssl_io->plain_input->real_stream->max_buffer_size;
sstream->istream.read = i_stream_ssl_read;
sstream->istream.istream.readable_fd = FALSE;
return i_stream_create(&sstream->istream, NULL,
i_stream_get_fd(ssl_io->plain_input), 0);
}
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