86 lines
2.2 KiB
C
86 lines
2.2 KiB
C
|
/*
|
||
|
* libwebsockets - small server side websockets and web server implementation
|
||
|
*
|
||
|
* Copyright (C) 2010-2018 Andy Green <andy@warmcat.com>
|
||
|
*
|
||
|
* This library is free software; you can redistribute it and/or
|
||
|
* modify it under the terms of the GNU Lesser General Public
|
||
|
* License as published by the Free Software Foundation:
|
||
|
* version 2.1 of the License.
|
||
|
*
|
||
|
* This library 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
|
||
|
* Lesser General Public License for more details.
|
||
|
*
|
||
|
* You should have received a copy of the GNU Lesser General Public
|
||
|
* License along with this library; if not, write to the Free Software
|
||
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
|
||
|
* MA 02110-1301 USA
|
||
|
*/
|
||
|
|
||
|
#define _GNU_SOURCE
|
||
|
#include "core/private.h"
|
||
|
|
||
|
#include <pwd.h>
|
||
|
#include <grp.h>
|
||
|
|
||
|
#if defined(LWS_HAVE_SYS_CAPABILITY_H) && defined(LWS_HAVE_LIBCAP)
|
||
|
static void
|
||
|
_lws_plat_apply_caps(int mode, const cap_value_t *cv, int count)
|
||
|
{
|
||
|
cap_t caps;
|
||
|
|
||
|
if (!count)
|
||
|
return;
|
||
|
|
||
|
caps = cap_get_proc();
|
||
|
|
||
|
cap_set_flag(caps, mode, count, cv, CAP_SET);
|
||
|
cap_set_proc(caps);
|
||
|
prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0);
|
||
|
cap_free(caps);
|
||
|
}
|
||
|
#endif
|
||
|
|
||
|
void
|
||
|
lws_plat_drop_app_privileges(const struct lws_context_creation_info *info)
|
||
|
{
|
||
|
if (info->gid && info->gid != -1)
|
||
|
if (setgid(info->gid))
|
||
|
lwsl_warn("setgid: %s\n", strerror(LWS_ERRNO));
|
||
|
|
||
|
if (info->uid && info->uid != -1) {
|
||
|
struct passwd *p = getpwuid(info->uid);
|
||
|
|
||
|
if (p) {
|
||
|
|
||
|
#if defined(LWS_HAVE_SYS_CAPABILITY_H) && defined(LWS_HAVE_LIBCAP)
|
||
|
_lws_plat_apply_caps(CAP_PERMITTED, info->caps,
|
||
|
info->count_caps);
|
||
|
#endif
|
||
|
|
||
|
initgroups(p->pw_name, info->gid);
|
||
|
if (setuid(info->uid))
|
||
|
lwsl_warn("setuid: %s\n", strerror(LWS_ERRNO));
|
||
|
else
|
||
|
lwsl_notice("Set privs to user '%s'\n",
|
||
|
p->pw_name);
|
||
|
|
||
|
#if defined(LWS_HAVE_SYS_CAPABILITY_H) && defined(LWS_HAVE_LIBCAP)
|
||
|
_lws_plat_apply_caps(CAP_EFFECTIVE, info->caps,
|
||
|
info->count_caps);
|
||
|
|
||
|
if (info->count_caps) {
|
||
|
int n;
|
||
|
for (n = 0; n < info->count_caps; n++)
|
||
|
lwsl_notice(" RETAINING CAP %d\n",
|
||
|
(int)info->caps[n]);
|
||
|
}
|
||
|
#endif
|
||
|
|
||
|
} else
|
||
|
lwsl_warn("getpwuid: unable to find uid %d", info->uid);
|
||
|
}
|
||
|
}
|