1073fb03ac
giving access to functionality that is not available in capability mode sandbox. The functionality can be precisely restricted. Start with the following services: - system.dns - provides API compatible to: - gethostbyname(3), - gethostbyname2(3), - gethostbyaddr(3), - getaddrinfo(3), - getnameinfo(3), - system.grp - provides getgrent(3)-compatible API, - system.pwd - provides getpwent(3)-compatible API, - system.random - allows to obtain entropy from /dev/random, - system.sysctl - provides sysctlbyname(3-compatible API. Sponsored by: The FreeBSD Foundation
267 lines
5.7 KiB
C
267 lines
5.7 KiB
C
/*-
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* Copyright (c) 2012-2013 The FreeBSD Foundation
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* All rights reserved.
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*
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* This software was developed by Pawel Jakub Dawidek under sponsorship from
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* the FreeBSD Foundation.
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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
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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* 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 AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <assert.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "libcapsicum.h"
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#include "libcapsicum_impl.h"
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#include "nv.h"
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/*
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* Structure describing communication channel between two separated processes.
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*/
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#define CAP_CHANNEL_MAGIC 0xcac8a31
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struct cap_channel {
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/*
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* Magic value helps to ensure that a pointer to the right structure is
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* passed to our functions.
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*/
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int cch_magic;
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/* Socket descriptor for IPC. */
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int cch_sock;
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};
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bool
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fd_is_valid(int fd)
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{
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return (fcntl(fd, F_GETFL) != -1 || errno != EBADF);
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}
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cap_channel_t *
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cap_init(void)
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{
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cap_channel_t *chan;
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struct sockaddr_un sun;
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int serrno, sock;
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bzero(&sun, sizeof(sun));
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sun.sun_family = AF_UNIX;
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strlcpy(sun.sun_path, CASPER_SOCKPATH, sizeof(sun.sun_path));
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sun.sun_len = SUN_LEN(&sun);
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sock = socket(AF_UNIX, SOCK_STREAM, 0);
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if (sock == -1)
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return (NULL);
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if (connect(sock, (struct sockaddr *)&sun, sizeof(sun)) < 0) {
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serrno = errno;
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close(sock);
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errno = serrno;
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return (NULL);
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}
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chan = cap_wrap(sock);
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if (chan == NULL) {
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serrno = errno;
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close(sock);
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errno = serrno;
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return (NULL);
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}
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return (chan);
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}
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cap_channel_t *
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cap_wrap(int sock)
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{
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cap_channel_t *chan;
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if (!fd_is_valid(sock))
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return (NULL);
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chan = malloc(sizeof(*chan));
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if (chan != NULL) {
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chan->cch_sock = sock;
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chan->cch_magic = CAP_CHANNEL_MAGIC;
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}
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return (chan);
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}
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int
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cap_unwrap(cap_channel_t *chan)
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{
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int sock;
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assert(chan != NULL);
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assert(chan->cch_magic == CAP_CHANNEL_MAGIC);
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sock = chan->cch_sock;
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chan->cch_magic = 0;
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free(chan);
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return (sock);
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}
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cap_channel_t *
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cap_clone(const cap_channel_t *chan)
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{
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cap_channel_t *newchan;
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nvlist_t *nvl;
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int newsock;
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assert(chan != NULL);
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assert(chan->cch_magic == CAP_CHANNEL_MAGIC);
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nvl = nvlist_create(0);
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nvlist_add_string(nvl, "cmd", "clone");
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nvl = cap_xfer_nvlist(chan, nvl);
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if (nvl == NULL)
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return (NULL);
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if (nvlist_get_number(nvl, "error") != 0) {
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errno = (int)nvlist_get_number(nvl, "error");
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nvlist_destroy(nvl);
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return (NULL);
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}
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newsock = nvlist_take_descriptor(nvl, "sock");
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nvlist_destroy(nvl);
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newchan = cap_wrap(newsock);
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if (newchan == NULL) {
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int serrno;
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serrno = errno;
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close(newsock);
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errno = serrno;
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}
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return (newchan);
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}
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void
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cap_close(cap_channel_t *chan)
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{
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assert(chan != NULL);
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assert(chan->cch_magic == CAP_CHANNEL_MAGIC);
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chan->cch_magic = 0;
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close(chan->cch_sock);
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free(chan);
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}
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int
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cap_sock(const cap_channel_t *chan)
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{
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assert(chan != NULL);
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assert(chan->cch_magic == CAP_CHANNEL_MAGIC);
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return (chan->cch_sock);
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}
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int
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cap_limit_set(const cap_channel_t *chan, nvlist_t *limits)
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{
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nvlist_t *nvlmsg;
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int error;
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nvlmsg = nvlist_create(0);
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nvlist_add_string(nvlmsg, "cmd", "limit_set");
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nvlist_add_nvlist(nvlmsg, "limits", limits);
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nvlmsg = cap_xfer_nvlist(chan, nvlmsg);
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if (nvlmsg == NULL) {
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nvlist_destroy(limits);
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return (-1);
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}
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error = (int)nvlist_get_number(nvlmsg, "error");
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nvlist_destroy(nvlmsg);
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nvlist_destroy(limits);
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if (error != 0) {
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errno = error;
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return (-1);
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}
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return (0);
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}
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int
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cap_limit_get(const cap_channel_t *chan, nvlist_t **limitsp)
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{
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nvlist_t *nvlmsg;
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int error;
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nvlmsg = nvlist_create(0);
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nvlist_add_string(nvlmsg, "cmd", "limit_get");
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nvlmsg = cap_xfer_nvlist(chan, nvlmsg);
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if (nvlmsg == NULL)
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return (-1);
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error = (int)nvlist_get_number(nvlmsg, "error");
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if (error != 0) {
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nvlist_destroy(nvlmsg);
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errno = error;
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return (-1);
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}
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if (nvlist_exists_null(nvlmsg, "limits"))
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*limitsp = NULL;
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else
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*limitsp = nvlist_take_nvlist(nvlmsg, "limits");
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nvlist_destroy(nvlmsg);
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return (0);
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}
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int
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cap_send_nvlist(const cap_channel_t *chan, const nvlist_t *nvl)
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{
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assert(chan != NULL);
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assert(chan->cch_magic == CAP_CHANNEL_MAGIC);
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return (nvlist_send(chan->cch_sock, nvl));
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}
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nvlist_t *
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cap_recv_nvlist(const cap_channel_t *chan)
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{
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assert(chan != NULL);
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assert(chan->cch_magic == CAP_CHANNEL_MAGIC);
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return (nvlist_recv(chan->cch_sock));
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}
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nvlist_t *
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cap_xfer_nvlist(const cap_channel_t *chan, nvlist_t *nvl)
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{
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assert(chan != NULL);
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assert(chan->cch_magic == CAP_CHANNEL_MAGIC);
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return (nvlist_xfer(chan->cch_sock, nvl));
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}
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