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/* Copyright (C) 2019 C. McEnroe <june@causal.agency>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
* Additional permission under GNU GPL version 3 section 7:
*
* If you modify this Program, or any covered work, by linking or
* combining it with OpenSSL (or a modified version of that library),
* containing parts covered by the terms of the OpenSSL License and the
* original SSLeay license, the licensors of this Program grant you
* additional permission to convey the resulting work. Corresponding
* Source for a non-source form of such a combination shall include the
* source code for the parts of OpenSSL used as well as that of the
* covered work.
*/
#include <err.h>
#include <errno.h>
#include <limits.h>
#include <netdb.h>
#include <netinet/in.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sysexits.h>
#include <tls.h>
#include <unistd.h>
#include "bounce.h"
static struct tls *server;
int localConfig(
const char *cert, const char *priv, const char *ca, bool require
) {
if (!server) server = tls_server();
if (!server) errx(EX_SOFTWARE, "tls_server");
struct tls_config *config = tls_config_new();
if (!config) errx(EX_SOFTWARE, "tls_config_new");
int error;
char buf[PATH_MAX];
for (int i = 0; configPath(buf, sizeof(buf), cert, i); ++i) {
error = tls_config_set_cert_file(config, buf);
if (!error) break;
}
if (error) goto fail;
for (int i = 0; configPath(buf, sizeof(buf), priv, i); ++i) {
error = tls_config_set_key_file(config, buf);
if (!error) break;
}
if (error) goto fail;
if (ca) {
for (int i = 0; configPath(buf, sizeof(buf), ca, i); ++i) {
error = tls_config_set_ca_file(config, buf);
if (!error) break;
}
if (error) goto fail;
if (require) {
tls_config_verify_client(config);
} else {
tls_config_verify_client_optional(config);
}
}
error = tls_configure(server, config);
if (error) errx(EX_SOFTWARE, "tls_configure: %s", tls_error(server));
tls_config_free(config);
return 0;
fail:
warnx("%s", tls_config_error(config));
tls_config_free(config);
return -1;
}
size_t localBind(int fds[], size_t cap, const char *host, const char *port) {
struct addrinfo *head;
struct addrinfo hints = {
.ai_family = AF_UNSPEC,
.ai_socktype = SOCK_STREAM,
.ai_protocol = IPPROTO_TCP,
};
int error = getaddrinfo(host, port, &hints, &head);
if (error) errx(EX_NOHOST, "%s:%s: %s", host, port, gai_strerror(error));
size_t len = 0;
for (struct addrinfo *ai = head; ai && len < cap; ai = ai->ai_next) {
fds[len] = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
if (fds[len] < 0) err(EX_OSERR, "socket");
int yes = 1;
error = setsockopt(fds[len], SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes));
if (error) err(EX_OSERR, "setsockopt");
error = bind(fds[len], ai->ai_addr, ai->ai_addrlen);
if (error) {
warn("%s:%s", host, port);
close(fds[len]);
continue;
}
len++;
}
freeaddrinfo(head);
if (!len) errx(EX_UNAVAILABLE, "could not bind any sockets");
return len;
}
static bool unix;
static int unixBind(int sock, const char *path) {
struct sockaddr_un addr = { .sun_family = AF_UNIX };
int len = snprintf(addr.sun_path, sizeof(addr.sun_path), "%s", path);
if ((size_t)len >= sizeof(addr.sun_path)) {
errx(EX_CONFIG, "path too long: %s", path);
}
int error = bind(sock, (struct sockaddr *)&addr, SUN_LEN(&addr));
if (!error || errno != EADDRINUSE) return error;
int check = socket(PF_UNIX, SOCK_STREAM, 0);
if (check < 0) err(EX_OSERR, "socket");
error = connect(check, (struct sockaddr *)&addr, SUN_LEN(&addr));
close(check);
if (!error) {
errno = EADDRINUSE;
return -1;
}
unlink(path);
return bind(sock, (struct sockaddr *)&addr, SUN_LEN(&addr));
}
size_t localUnix(int fds[], size_t cap, const char *path) {
if (!cap) return 0;
int sock = socket(PF_UNIX, SOCK_STREAM, 0);
if (sock < 0) err(EX_OSERR, "socket");
int error = unixBind(sock, path);
if (error) err(EX_UNAVAILABLE, "%s", path);
unix = true;
fds[0] = sock;
return 1;
}
static int recvfd(int sock) {
char buf[CMSG_SPACE(sizeof(int))];
char x;
struct iovec iov = { .iov_base = &x, .iov_len = 1 };
struct msghdr msg = {
.msg_iov = &iov,
.msg_iovlen = 1,
.msg_control = buf,
.msg_controllen = sizeof(buf),
};
if (0 > recvmsg(sock, &msg, 0)) return -1;
struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg);
if (!cmsg || cmsg->cmsg_type != SCM_RIGHTS) {
errno = ENOMSG;
return -1;
}
return *(int *)CMSG_DATA(cmsg);
}
int localAccept(struct tls **client, int bind) {
int fd = accept(bind, NULL, NULL);
if (fd < 0) return fd;
if (unix) {
int sent = recvfd(fd);
close(fd);
if (sent < 0) return sent;
fd = sent;
}
int error = tls_accept_socket(server, client, fd);
if (error) errx(EX_SOFTWARE, "tls_accept_socket: %s", tls_error(server));
return fd;
}
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