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747 lines
17 KiB
C
747 lines
17 KiB
C
/*-
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* SSLsplit - transparent SSL/TLS interception
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* https://www.roe.ch/SSLsplit
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*
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* Copyright (c) 2009-2019, Daniel Roethlisberger <daniel@roe.ch>.
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* Copyright (c) 2017-2024, Soner Tari <sonertari@gmail.com>.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "opts.h"
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#include "sys.h"
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#include "log.h"
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#include "defaults.h"
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#include <string.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/resource.h>
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#include <errno.h>
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#define equal(s1, s2) strlen((s1)) == strlen((s2)) && !strcmp((s1), (s2))
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/*
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* Handle out of memory conditions in early stages of main().
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* Print error message and exit with failure status code.
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* Does not return.
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*/
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void NORET
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oom_die(const char *argv0)
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{
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fprintf(stderr, "%s: out of memory\n", argv0);
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exit(EXIT_FAILURE);
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}
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opts_t *
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opts_new(void)
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{
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opts_t *opts;
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opts = malloc(sizeof(opts_t));
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memset(opts, 0, sizeof(opts_t));
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opts->stats_period = 1;
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return opts;
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}
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void
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opts_free(opts_t *opts)
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{
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if (opts->spec) {
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proxyspec_free(opts->spec);
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}
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if (opts->dropuser) {
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free(opts->dropuser);
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}
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if (opts->dropgroup) {
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free(opts->dropgroup);
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}
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if (opts->jaildir) {
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free(opts->jaildir);
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}
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if (opts->pidfile) {
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free(opts->pidfile);
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}
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if (opts->conffile) {
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free(opts->conffile);
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}
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if (opts->connectlog) {
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free(opts->connectlog);
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}
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if (opts->contentlog) {
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free(opts->contentlog);
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}
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if (opts->contentlog_basedir) {
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free(opts->contentlog_basedir);
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}
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memset(opts, 0, sizeof(opts_t));
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free(opts);
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}
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/*
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* Parse proxyspecs using a simple state machine.
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*/
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void
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proxyspec_parse(int *argc, char **argv[], proxyspec_t **opts_spec)
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{
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proxyspec_t *spec = NULL;
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int af = AF_UNSPEC;
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int state = 0;
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char *la, *lp;
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while ((*argc)--) {
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switch (state) {
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default:
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case 0:
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spec = malloc(sizeof(proxyspec_t));
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memset(spec, 0, sizeof(proxyspec_t));
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spec->next = *opts_spec;
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*opts_spec = spec;
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// @todo IPv6?
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la = **argv;
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state++;
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break;
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case 1:
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lp = **argv;
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af = sys_sockaddr_parse(&spec->listen_addr,
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&spec->listen_addrlen,
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la, lp,
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sys_get_af(la),
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EVUTIL_AI_PASSIVE);
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if (af == -1) {
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exit(EXIT_FAILURE);
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}
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state = 0;
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break;
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}
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(*argv)++;
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}
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if (state != 0 && state != 4) {
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fprintf(stderr, "Incomplete proxyspec!\n");
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exit(EXIT_FAILURE);
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}
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}
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/*
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* Clear and free a proxy spec.
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*/
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void
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proxyspec_free(proxyspec_t *spec)
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{
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do {
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proxyspec_t *next = spec->next;
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memset(spec, 0, sizeof(proxyspec_t));
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free(spec);
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spec = next;
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} while (spec);
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}
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/*
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* Return text representation of proxy spec for display to the user.
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* Returned string must be freed by caller.
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*/
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char *
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proxyspec_str(proxyspec_t *spec)
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{
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char *s;
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char *lhbuf, *lpbuf;
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char *cbuf = NULL;
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if (sys_sockaddr_str((struct sockaddr *)&spec->listen_addr,
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spec->listen_addrlen, &lhbuf, &lpbuf) != 0) {
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return NULL;
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}
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if (spec->connect_addrlen) {
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char *chbuf, *cpbuf;
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if (sys_sockaddr_str((struct sockaddr *)&spec->connect_addr,
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spec->connect_addrlen,
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&chbuf, &cpbuf) != 0) {
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return NULL;
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}
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if (asprintf(&cbuf, "\nconnect= [%s]:%s", chbuf, cpbuf) < 0) {
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return NULL;
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}
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free(chbuf);
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free(cpbuf);
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}
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if (asprintf(&s, "listen=[%s]:%s %s", lhbuf, lpbuf, "tcp") < 0) {
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s = NULL;
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}
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free(lhbuf);
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free(lpbuf);
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if (cbuf)
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free(cbuf);
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return s;
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}
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void
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opts_set_user(opts_t *opts, const char *argv0, const char *optarg)
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{
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if (!sys_isuser(optarg)) {
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fprintf(stderr, "%s: '%s' is not an existing user\n",
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argv0, optarg);
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exit(EXIT_FAILURE);
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}
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if (opts->dropuser)
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free(opts->dropuser);
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opts->dropuser = strdup(optarg);
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if (!opts->dropuser)
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oom_die(argv0);
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#ifdef DEBUG_OPTS
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log_dbg_printf("User: %s\n", opts->dropuser);
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#endif /* DEBUG_OPTS */
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}
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void
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opts_set_group(opts_t *opts, const char *argv0, const char *optarg)
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{
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if (!sys_isgroup(optarg)) {
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fprintf(stderr, "%s: '%s' is not an existing group\n",
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argv0, optarg);
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exit(EXIT_FAILURE);
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}
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if (opts->dropgroup)
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free(opts->dropgroup);
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opts->dropgroup = strdup(optarg);
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if (!opts->dropgroup)
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oom_die(argv0);
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#ifdef DEBUG_OPTS
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log_dbg_printf("Group: %s\n", opts->dropgroup);
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#endif /* DEBUG_OPTS */
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}
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void
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opts_set_jaildir(opts_t *opts, const char *argv0, const char *optarg)
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{
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if (!sys_isdir(optarg)) {
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fprintf(stderr, "%s: '%s' is not a directory\n", argv0, optarg);
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exit(EXIT_FAILURE);
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}
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if (opts->jaildir)
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free(opts->jaildir);
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opts->jaildir = realpath(optarg, NULL);
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if (!opts->jaildir) {
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fprintf(stderr, "%s: Failed to realpath '%s': %s (%i)\n",
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argv0, optarg, strerror(errno), errno);
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exit(EXIT_FAILURE);
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}
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#ifdef DEBUG_OPTS
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log_dbg_printf("Chroot: %s\n", opts->jaildir);
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#endif /* DEBUG_OPTS */
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}
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void
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opts_set_pidfile(opts_t *opts, const char *argv0, const char *optarg)
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{
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if (opts->pidfile)
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free(opts->pidfile);
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opts->pidfile = strdup(optarg);
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if (!opts->pidfile)
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oom_die(argv0);
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#ifdef DEBUG_OPTS
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log_dbg_printf("PidFile: %s\n", opts->pidfile);
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#endif /* DEBUG_OPTS */
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}
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void
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opts_set_connectlog(opts_t *opts, const char *argv0, const char *optarg)
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{
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if (opts->connectlog)
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free(opts->connectlog);
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if (!(opts->connectlog = sys_realdir(optarg))) {
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if (errno == ENOENT) {
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fprintf(stderr, "Directory part of '%s' does not "
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"exist\n", optarg);
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exit(EXIT_FAILURE);
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} else {
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fprintf(stderr, "Failed to realpath '%s': %s (%i)\n",
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optarg, strerror(errno), errno);
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oom_die(argv0);
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}
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}
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#ifdef DEBUG_OPTS
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log_dbg_printf("ConnectLog: %s\n", opts->connectlog);
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#endif /* DEBUG_OPTS */
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}
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void
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opts_set_contentlog(opts_t *opts, const char *argv0, const char *optarg)
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{
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if (opts->contentlog)
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free(opts->contentlog);
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if (!(opts->contentlog = sys_realdir(optarg))) {
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if (errno == ENOENT) {
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fprintf(stderr, "Directory part of '%s' does not "
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"exist\n", optarg);
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exit(EXIT_FAILURE);
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} else {
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fprintf(stderr, "Failed to realpath '%s': %s (%i)\n",
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optarg, strerror(errno), errno);
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oom_die(argv0);
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}
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}
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opts->contentlog_isdir = 0;
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opts->contentlog_isspec = 0;
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#ifdef DEBUG_OPTS
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log_dbg_printf("ContentLog: %s\n", opts->contentlog);
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#endif /* DEBUG_OPTS */
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}
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void
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opts_set_contentlogdir(opts_t *opts, const char *argv0, const char *optarg)
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{
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if (!sys_isdir(optarg)) {
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fprintf(stderr, "%s: '%s' is not a directory\n", argv0, optarg);
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exit(EXIT_FAILURE);
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}
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if (opts->contentlog)
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free(opts->contentlog);
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opts->contentlog = realpath(optarg, NULL);
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if (!opts->contentlog) {
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fprintf(stderr, "%s: Failed to realpath '%s': %s (%i)\n",
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argv0, optarg, strerror(errno), errno);
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exit(EXIT_FAILURE);
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}
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opts->contentlog_isdir = 1;
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opts->contentlog_isspec = 0;
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#ifdef DEBUG_OPTS
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log_dbg_printf("ContentLogDir: %s\n", opts->contentlog);
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#endif /* DEBUG_OPTS */
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}
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static void
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opts_set_logbasedir(const char *argv0, const char *optarg,
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char **basedir, char **log)
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{
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char *lhs, *rhs, *p, *q;
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size_t n;
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if (*basedir)
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free(*basedir);
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if (*log)
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free(*log);
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if (log_content_split_pathspec(optarg, &lhs, &rhs) == -1) {
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fprintf(stderr, "%s: Failed to split '%s' in lhs/rhs:"
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" %s (%i)\n", argv0, optarg,
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strerror(errno), errno);
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exit(EXIT_FAILURE);
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}
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/* eliminate %% from lhs */
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for (p = q = lhs; *p; p++, q++) {
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if (q < p)
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*q = *p;
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if (*p == '%' && *(p+1) == '%')
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p++;
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}
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*q = '\0';
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/* all %% in lhs resolved to % */
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if (sys_mkpath(lhs, 0777) == -1) {
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fprintf(stderr, "%s: Failed to create '%s': %s (%i)\n",
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argv0, lhs, strerror(errno), errno);
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exit(EXIT_FAILURE);
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}
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*basedir = realpath(lhs, NULL);
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if (!*basedir) {
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fprintf(stderr, "%s: Failed to realpath '%s': %s (%i)\n",
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argv0, lhs, strerror(errno), errno);
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exit(EXIT_FAILURE);
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}
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/* count '%' in basedir */
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for (n = 0, p = *basedir;
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*p;
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p++) {
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if (*p == '%')
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n++;
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}
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free(lhs);
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n += strlen(*basedir);
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if (!(lhs = malloc(n + 1)))
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oom_die(argv0);
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/* re-encoding % to %%, copying basedir to lhs */
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for (p = *basedir, q = lhs;
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*p;
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p++, q++) {
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*q = *p;
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if (*q == '%')
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*(++q) = '%';
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}
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*q = '\0';
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/* lhs contains encoded realpathed basedir */
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if (asprintf(log, "%s/%s", lhs, rhs) < 0)
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oom_die(argv0);
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free(lhs);
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free(rhs);
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}
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void
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opts_set_contentlogpathspec(opts_t *opts, const char *argv0, const char *optarg)
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{
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opts_set_logbasedir(argv0, optarg, &opts->contentlog_basedir,
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&opts->contentlog);
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opts->contentlog_isdir = 0;
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opts->contentlog_isspec = 1;
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#ifdef DEBUG_OPTS
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log_dbg_printf("ContentLogPathSpec: basedir=%s, %s\n",
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opts->contentlog_basedir, opts->contentlog);
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#endif /* DEBUG_OPTS */
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}
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void
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opts_set_daemon(opts_t *opts)
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{
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opts->detach = 1;
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}
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void
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opts_unset_daemon(opts_t *opts)
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{
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opts->detach = 0;
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}
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void
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opts_set_debug(opts_t *opts)
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{
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log_dbg_mode(LOG_DBG_MODE_ERRLOG);
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opts->debug = 1;
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}
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void
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opts_unset_debug(opts_t *opts)
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{
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log_dbg_mode(LOG_DBG_MODE_NONE);
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opts->debug = 0;
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}
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void
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opts_set_debug_level(const char *optarg)
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{
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if (equal(optarg, "2")) {
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log_dbg_mode(LOG_DBG_MODE_FINE);
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} else if (equal(optarg, "3")) {
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log_dbg_mode(LOG_DBG_MODE_FINER);
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} else if (equal(optarg, "4")) {
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log_dbg_mode(LOG_DBG_MODE_FINEST);
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} else {
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fprintf(stderr, "Invalid DebugLevel '%s', use 2-4\n", optarg);
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exit(EXIT_FAILURE);
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}
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#ifdef DEBUG_OPTS
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log_dbg_printf("DebugLevel: %s\n", optarg);
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#endif /* DEBUG_OPTS */
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}
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void
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opts_set_statslog(opts_t *opts)
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{
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opts->statslog = 1;
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}
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void
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opts_unset_statslog(opts_t *opts)
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{
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opts->statslog = 0;
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}
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|
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static void
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opts_set_open_files_limit(const char *value, int line_num)
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{
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unsigned int i = atoi(value);
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if (i >= 50 && i <= 10000) {
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struct rlimit rl;
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rl.rlim_cur = i;
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rl.rlim_max = i;
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if (setrlimit(RLIMIT_NOFILE, &rl) == -1) {
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fprintf(stderr, "Failed setting OpenFilesLimit\n");
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if (errno) {
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fprintf(stderr, "%s\n", strerror(errno));
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}
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exit(EXIT_FAILURE);
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|
}
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} else {
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fprintf(stderr, "Invalid OpenFilesLimit %s on line %d, use 50-10000\n", value, line_num);
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exit(EXIT_FAILURE);
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|
}
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|
#ifdef DEBUG_OPTS
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log_dbg_printf("OpenFilesLimit: %u\n", i);
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#endif /* DEBUG_OPTS */
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}
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static int
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check_value_yesno(const char *value, const char *name, int line_num)
|
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{
|
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if (equal(value, "yes")) {
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return 1;
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} else if (equal(value, "no")) {
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return 0;
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}
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fprintf(stderr, "Error in conf: Invalid '%s' value '%s' on line %d, use yes|no\n", name, value, line_num);
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return -1;
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}
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|
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#define MAX_TOKEN 10
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|
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static int
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set_option(opts_t *opts, const char *argv0,
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const char *name, char *value, int line_num)
|
|
{
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int yes;
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int retval = -1;
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|
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if (equal(name, "User")) {
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opts_set_user(opts, argv0, value);
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} else if (equal(name, "Group")) {
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opts_set_group(opts, argv0, value);
|
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} else if (equal(name, "Chroot")) {
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opts_set_jaildir(opts, argv0, value);
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} else if (equal(name, "PidFile")) {
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opts_set_pidfile(opts, argv0, value);
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} else if (equal(name, "ConnectLog")) {
|
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opts_set_connectlog(opts, argv0, value);
|
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} else if (equal(name, "ContentLog")) {
|
|
opts_set_contentlog(opts, argv0, value);
|
|
} else if (equal(name, "ContentLogDir")) {
|
|
opts_set_contentlogdir(opts, argv0, value);
|
|
} else if (equal(name, "ContentLogPathSpec")) {
|
|
opts_set_contentlogpathspec(opts, argv0, value);
|
|
} else if (equal(name, "Daemon")) {
|
|
yes = check_value_yesno(value, "Daemon", line_num);
|
|
if (yes == -1) {
|
|
goto leave;
|
|
}
|
|
yes ? opts_set_daemon(opts) : opts_unset_daemon(opts);
|
|
#ifdef DEBUG_OPTS
|
|
log_dbg_printf("Daemon: %u\n", opts->detach);
|
|
#endif /* DEBUG_OPTS */
|
|
} else if (equal(name, "Debug")) {
|
|
yes = check_value_yesno(value, "Debug", line_num);
|
|
if (yes == -1) {
|
|
goto leave;
|
|
}
|
|
yes ? opts_set_debug(opts) : opts_unset_debug(opts);
|
|
#ifdef DEBUG_OPTS
|
|
log_dbg_printf("Debug: %u\n", opts->debug);
|
|
#endif /* DEBUG_OPTS */
|
|
} else if (equal(name, "DebugLevel")) {
|
|
opts_set_debug_level(value);
|
|
} else if (equal(name, "ProxySpec")) {
|
|
/* Use MAX_TOKEN instead of computing the actual number of tokens in value */
|
|
char **argv = malloc(sizeof(char *) * MAX_TOKEN);
|
|
char **save_argv = argv;
|
|
int argc = 0;
|
|
char *p, *last = NULL;
|
|
|
|
for ((p = strtok_r(value, " ", &last));
|
|
p;
|
|
(p = strtok_r(NULL, " ", &last))) {
|
|
/* Limit max # token */
|
|
if (argc < MAX_TOKEN) {
|
|
argv[argc++] = p;
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
|
|
proxyspec_parse(&argc, &argv, &opts->spec);
|
|
free(save_argv);
|
|
} else if (!strncasecmp(name, "LogStats", 9)) {
|
|
yes = check_value_yesno(value, "LogStats", line_num);
|
|
if (yes == -1) {
|
|
goto leave;
|
|
}
|
|
yes ? opts_set_statslog(opts) : opts_unset_statslog(opts);
|
|
#ifdef DEBUG_OPTS
|
|
log_dbg_printf("LogStats: %u\n", opts->statslog);
|
|
#endif /* DEBUG_OPTS */
|
|
} else if (!strncasecmp(name, "StatsPeriod", 12)) {
|
|
unsigned int i = atoi(value);
|
|
if (i >= 1 && i <= 10) {
|
|
opts->stats_period = i;
|
|
} else {
|
|
fprintf(stderr, "Invalid StatsPeriod %s on line %d, use 1-10\n", value, line_num);
|
|
goto leave;
|
|
}
|
|
#ifdef DEBUG_OPTS
|
|
log_dbg_printf("StatsPeriod: %u\n", opts->stats_period);
|
|
#endif /* DEBUG_OPTS */
|
|
} else if (!strncasecmp(name, "OpenFilesLimit", 15)) {
|
|
opts_set_open_files_limit(value, line_num);
|
|
} else {
|
|
#ifdef DEBUG_OPTS
|
|
log_dbg_printf("Skipping option '%s' on line %d\n", name, line_num);
|
|
#endif /* DEBUG_OPTS */
|
|
}
|
|
|
|
retval = 0;
|
|
leave:
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
* Separator param is needed for command line options only.
|
|
* Conf file option separator is ' '.
|
|
*/
|
|
static int
|
|
get_name_value(char **name, char **value, const char sep)
|
|
{
|
|
char *n, *v, *value_end;
|
|
int retval = -1;
|
|
|
|
/* Skip to the end of option name and terminate it with '\0' */
|
|
for (n = *name;; n++) {
|
|
/* White spaces possible around separator,
|
|
* if the command line option is passed between the quotes */
|
|
if (*n == ' ' || *n == '\t' || *n == sep) {
|
|
*n = '\0';
|
|
n++;
|
|
break;
|
|
}
|
|
if (*n == '\0') {
|
|
n = NULL;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* No option name */
|
|
if (n == NULL) {
|
|
fprintf(stderr, "Error in option: No option name\n");
|
|
goto leave;
|
|
}
|
|
|
|
/* White spaces possible before value and around separator,
|
|
* if the command line option is passed between the quotes */
|
|
while (*n == ' ' || *n == '\t' || *n == sep) {
|
|
n++;
|
|
}
|
|
|
|
*value = n;
|
|
|
|
/* Find end of value and terminate it with '\0'
|
|
* Find first occurrence of trailing white space */
|
|
value_end = NULL;
|
|
for (v = *value;; v++) {
|
|
if (*v == '\0') {
|
|
break;
|
|
}
|
|
if (*v == '\r' || *v == '\n') {
|
|
*v = '\0';
|
|
break;
|
|
}
|
|
if (*v == ' ' || *v == '\t') {
|
|
if (!value_end) {
|
|
value_end = v;
|
|
}
|
|
} else {
|
|
value_end = NULL;
|
|
}
|
|
}
|
|
|
|
if (value_end) {
|
|
*value_end = '\0';
|
|
}
|
|
|
|
retval = 0;
|
|
leave:
|
|
return retval;
|
|
}
|
|
|
|
int
|
|
opts_set_option(opts_t *opts, const char *argv0, const char *optarg)
|
|
{
|
|
char *name, *value;
|
|
int retval = -1;
|
|
char *line = strdup(optarg);
|
|
|
|
/* White spaces possible before option name,
|
|
* if the command line option is passed between the quotes */
|
|
for (name = line; *name == ' ' || *name == '\t'; name++);
|
|
|
|
/* Command line option separator is '=' */
|
|
retval = get_name_value(&name, &value, '=');
|
|
if (retval == 0) {
|
|
/* Line number param is for conf file, pass 0 for command line options */
|
|
retval = set_option(opts, argv0, name, value, 0);
|
|
}
|
|
|
|
if (line)
|
|
free(line);
|
|
return retval;
|
|
}
|
|
|
|
int
|
|
opts_load_conffile(opts_t *opts, const char *argv0)
|
|
{
|
|
int retval, line_num;
|
|
char *line, *name, *value;
|
|
size_t line_len;
|
|
FILE *f;
|
|
|
|
f = fopen(opts->conffile, "r");
|
|
if (!f) {
|
|
fprintf(stderr, "Error opening conf file '%s': %s\n", opts->conffile, strerror(errno));
|
|
return -1;
|
|
}
|
|
|
|
line = NULL;
|
|
line_num = 0;
|
|
retval = -1;
|
|
while (!feof(f)) {
|
|
if (getline(&line, &line_len, f) == -1) {
|
|
break;
|
|
}
|
|
if (line == NULL) {
|
|
fprintf(stderr, "Error in conf file: getline() returns NULL line after line %d\n", line_num);
|
|
goto leave;
|
|
}
|
|
line_num++;
|
|
|
|
/* Skip white space */
|
|
for (name = line; *name == ' ' || *name == '\t'; name++);
|
|
|
|
/* Skip comments and empty lines */
|
|
if ((name[0] == '\0') || (name[0] == '#') || (name[0] == ';') ||
|
|
(name[0] == '\r') || (name[0] == '\n')) {
|
|
continue;
|
|
}
|
|
|
|
retval = get_name_value(&name, &value, ' ');
|
|
if (retval == 0) {
|
|
retval = set_option(opts, argv0, name, value, line_num);
|
|
}
|
|
|
|
if (retval == -1) {
|
|
goto leave;
|
|
}
|
|
free(line);
|
|
line = NULL;
|
|
}
|
|
|
|
leave:
|
|
fclose(f);
|
|
if (line)
|
|
free(line);
|
|
return retval;
|
|
}
|
|
|
|
/* vim: set noet ft=c: */
|