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/* $OpenBSD: check_tls.c,v 1.3 2023/07/03 09:38:08 claudio Exp $ */
/*
* Copyright (c) 2017 Claudio Jeker <claudio@openbsd.org>
* Copyright (c) 2007 - 2014 Reyk Floeter <reyk@openbsd.org>
* Copyright (c) 2006 Pierre-Yves Ritschard <pyr@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/uio.h>
#include <limits.h>
#include <event.h>
#include <unistd.h>
#include <string.h>
#include <imsg.h>
#include "relayd.h"
void check_tls_read(int, short, void *);
void check_tls_write(int, short, void *);
void check_tls_handshake(int, short, void *);
void check_tls_cleanup(struct ctl_tcp_event *);
void check_tls_error(struct ctl_tcp_event *, const char *, const char *);
void
check_tls_read(int s, short event, void *arg)
{
char rbuf[SMALL_READ_BUF_SIZE];
struct ctl_tcp_event *cte = arg;
int retry_flag = EV_READ;
int ret;
if (event == EV_TIMEOUT) {
cte->host->up = HOST_DOWN;
check_tls_cleanup(cte);
hce_notify_done(cte->host, HCE_TLS_READ_TIMEOUT);
return;
}
bzero(rbuf, sizeof(rbuf));
ret = tls_read(cte->tls, rbuf, sizeof(rbuf));
if (ret > 0) {
if (ibuf_add(cte->buf, rbuf, ret) == -1)
fatal("check_tls_read: buf_add error");
if (cte->validate_read != NULL &&
cte->validate_read(cte) == 0) {
check_tls_cleanup(cte);
hce_notify_done(cte->host, cte->host->he);
return;
}
} else if (ret == 0) {
cte->host->up = HOST_DOWN;
(void)cte->validate_close(cte);
check_tls_cleanup(cte);
hce_notify_done(cte->host, cte->host->he);
return;
} else if (ret == TLS_WANT_POLLIN) {
retry_flag = EV_READ;
} else if (ret == TLS_WANT_POLLOUT) {
retry_flag = EV_WRITE;
} else {
cte->host->up = HOST_DOWN;
check_tls_error(cte, cte->host->conf.name, "cannot read");
check_tls_cleanup(cte);
hce_notify_done(cte->host, HCE_TLS_READ_ERROR);
return;
}
event_again(&cte->ev, s, EV_TIMEOUT|retry_flag, check_tls_read,
&cte->tv_start, &cte->table->conf.timeout, cte);
return;
}
void
check_tls_write(int s, short event, void *arg)
{
struct ctl_tcp_event *cte = arg;
int retry_flag = EV_WRITE;
int len;
int ret;
void *buf;
if (event == EV_TIMEOUT) {
cte->host->up = HOST_DOWN;
check_tls_cleanup(cte);
hce_notify_done(cte->host, HCE_TLS_WRITE_TIMEOUT);
return;
}
if (cte->table->sendbinbuf != NULL) {
len = ibuf_size(cte->table->sendbinbuf);
buf = ibuf_data(cte->table->sendbinbuf);
log_debug("%s: table %s sending binary", __func__,
cte->table->conf.name);
print_hex(buf, 0, len);
} else {
len = strlen(cte->table->sendbuf);
buf = cte->table->sendbuf;
}
ret = tls_write(cte->tls, buf, len);
if (ret > 0) {
if ((cte->buf = ibuf_dynamic(SMALL_READ_BUF_SIZE, UINT_MAX)) ==
NULL)
fatalx("ssl_write: cannot create dynamic buffer");
event_again(&cte->ev, s, EV_TIMEOUT|EV_READ, check_tls_read,
&cte->tv_start, &cte->table->conf.timeout, cte);
return;
} else if (ret == TLS_WANT_POLLIN) {
retry_flag = EV_READ;
} else if (ret == TLS_WANT_POLLOUT) {
retry_flag = EV_WRITE;
} else {
cte->host->up = HOST_DOWN;
check_tls_error(cte, cte->host->conf.name, "cannot write");
check_tls_cleanup(cte);
hce_notify_done(cte->host, HCE_TLS_WRITE_ERROR);
return;
}
event_again(&cte->ev, s, EV_TIMEOUT|retry_flag, check_tls_write,
&cte->tv_start, &cte->table->conf.timeout, cte);
}
void
check_tls_handshake(int fd, short event, void *arg)
{
struct ctl_tcp_event *cte = arg;
int retry_flag = 0;
int ret;
if (event == EV_TIMEOUT) {
cte->host->up = HOST_DOWN;
hce_notify_done(cte->host, HCE_TLS_CONNECT_TIMEOUT);
check_tls_cleanup(cte);
return;
}
ret = tls_handshake(cte->tls);
if (ret == 0) {
if (cte->table->conf.check == CHECK_TCP) {
cte->host->up = HOST_UP;
hce_notify_done(cte->host, HCE_TLS_CONNECT_OK);
check_tls_cleanup(cte);
return;
}
if (cte->table->sendbuf != NULL) {
event_again(&cte->ev, cte->s, EV_TIMEOUT|EV_WRITE,
check_tls_write, &cte->tv_start,
&cte->table->conf.timeout, cte);
return;
}
if ((cte->buf = ibuf_dynamic(SMALL_READ_BUF_SIZE, UINT_MAX)) ==
NULL)
fatalx("ssl_connect: cannot create dynamic buffer");
event_again(&cte->ev, cte->s, EV_TIMEOUT|EV_READ,
check_tls_read, &cte->tv_start, &cte->table->conf.timeout,
cte);
return;
} else if (ret == TLS_WANT_POLLIN) {
retry_flag = EV_READ;
} else if (ret == TLS_WANT_POLLOUT) {
retry_flag = EV_WRITE;
} else {
cte->host->up = HOST_DOWN;
check_tls_error(cte, cte->host->conf.name,
"cannot connect");
hce_notify_done(cte->host, HCE_TLS_CONNECT_FAIL);
check_tls_cleanup(cte);
return;
}
event_again(&cte->ev, cte->s, EV_TIMEOUT|retry_flag,
check_tls_handshake,
&cte->tv_start, &cte->table->conf.timeout, cte);
}
void
check_tls_cleanup(struct ctl_tcp_event *cte)
{
tls_close(cte->tls);
tls_reset(cte->tls);
close(cte->s);
ibuf_free(cte->buf);
cte->buf = NULL;
}
void
check_tls_error(struct ctl_tcp_event *cte, const char *where, const char *what)
{
if (log_getverbose() < 2)
return;
log_debug("TLS error: %s: %s: %s", where, what, tls_error(cte->tls));
}
void
check_tls(struct ctl_tcp_event *cte)
{
if (cte->tls == NULL) {
cte->tls = tls_client();
if (cte->tls == NULL)
fatal("cannot create TLS connection");
}
/* need to re-configure because of tls_reset */
if (tls_configure(cte->tls, cte->table->tls_cfg) == -1)
fatal("cannot configure TLS connection");
if (tls_connect_socket(cte->tls, cte->s, NULL) == -1) {
check_tls_error(cte, cte->host->conf.name,
"cannot connect");
tls_close(cte->tls);
tls_reset(cte->tls);
cte->host->up = HOST_UNKNOWN;
hce_notify_done(cte->host, HCE_TLS_CONNECT_ERROR);
return;
}
event_again(&cte->ev, cte->s, EV_TIMEOUT|EV_WRITE, check_tls_handshake,
&cte->tv_start, &cte->table->conf.timeout, cte);
}
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