Forgot to 'svn add' lib/libcasper/ directory.
Reported by: glebius
This commit is contained in:
pjd
parent
6149217d80
commit
2242a8e5ab
19
lib/libcasper/Makefile
Normal file
19
lib/libcasper/Makefile
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@ -0,0 +1,19 @@
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# $FreeBSD$
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LIB= casper
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SHLIB_MAJOR= 0
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SRCS= libcasper.c
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INCS= libcasper.h
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DPADD= ${LIBCAPSICUM} ${LIBNV} ${LIBPJDLOG}
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LDADD= -lcapsicum -lnv -lpjdlog
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CFLAGS+=-I${.CURDIR}
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CFLAGS+=-I${.CURDIR}/../libpjdlog
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CFLAGS+=-I${.CURDIR}/../../sbin/casper
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WARNS?= 6
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.include <bsd.lib.mk>
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441
lib/libcasper/libcasper.c
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441
lib/libcasper/libcasper.c
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@ -0,0 +1,441 @@
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/*-
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* Copyright (c) 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/capability.h>
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#include <sys/queue.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/un.h>
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#include <assert.h>
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#include <dirent.h>
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#include <err.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 <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <strings.h>
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#include <unistd.h>
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#include <libcapsicum.h>
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#include <libcasper.h>
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#include <libcasper_impl.h>
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#include <nv.h>
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#include <pjdlog.h>
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/*
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* Currently there is only one service_connection per service.
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* In the future we may want multiple connections from multiple clients
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* per one service instance, but it has to be carefully designed.
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* The problem is that we may restrict/sandbox service instance according
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* to the limits provided. When new connection comes in with different
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* limits we won't be able to access requested resources.
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* Not to mention one process will serve to mutiple mutually untrusted
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* clients and compromise of this service instance by one of its clients
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* can lead to compromise of the other clients.
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*/
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/*
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* Client connections to the given service.
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*/
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#define SERVICE_CONNECTION_MAGIC 0x5e91c0ec
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struct service_connection {
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int sc_magic;
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cap_channel_t *sc_chan;
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nvlist_t *sc_limits;
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TAILQ_ENTRY(service_connection) sc_next;
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};
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#define SERVICE_MAGIC 0x5e91ce
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struct service {
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int s_magic;
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char *s_name;
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service_limit_func_t *s_limit;
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service_command_func_t *s_command;
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TAILQ_HEAD(, service_connection) s_connections;
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};
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struct service *
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service_alloc(const char *name, service_limit_func_t *limitfunc,
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service_command_func_t *commandfunc)
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{
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struct service *service;
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service = malloc(sizeof(*service));
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if (service == NULL)
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return (NULL);
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service->s_name = strdup(name);
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if (service->s_name == NULL) {
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free(service);
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return (NULL);
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}
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service->s_limit = limitfunc;
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service->s_command = commandfunc;
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TAILQ_INIT(&service->s_connections);
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service->s_magic = SERVICE_MAGIC;
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return (service);
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}
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void
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service_free(struct service *service)
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{
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struct service_connection *sconn;
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PJDLOG_ASSERT(service->s_magic = SERVICE_MAGIC);
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service->s_magic = 0;
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while ((sconn = service_connection_first(service)) != NULL)
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service_connection_remove(service, sconn);
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free(service->s_name);
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free(service);
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}
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struct service_connection *
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service_connection_add(struct service *service, int sock,
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const nvlist_t *limits)
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{
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struct service_connection *sconn;
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int serrno;
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PJDLOG_ASSERT(service->s_magic = SERVICE_MAGIC);
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sconn = malloc(sizeof(*sconn));
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if (sconn == NULL) {
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pjdlog_error("Unable to allocate memory for service connection.");
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return (NULL);
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}
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sconn->sc_chan = cap_wrap(sock);
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if (sconn->sc_chan == NULL) {
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serrno = errno;
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pjdlog_error("Unable to wrap communication channel.");
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free(sconn);
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errno = serrno;
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return (NULL);
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}
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if (limits == NULL) {
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sconn->sc_limits = NULL;
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} else {
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sconn->sc_limits = nvlist_clone(limits);
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if (sconn->sc_limits == NULL) {
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serrno = errno;
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pjdlog_error("Unable to clone limits.");
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(void)cap_unwrap(sconn->sc_chan);
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free(sconn);
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errno = serrno;
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return (NULL);
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}
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}
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sconn->sc_magic = SERVICE_CONNECTION_MAGIC;
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TAILQ_INSERT_TAIL(&service->s_connections, sconn, sc_next);
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return (sconn);
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}
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void
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service_connection_remove(struct service *service,
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struct service_connection *sconn)
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{
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PJDLOG_ASSERT(service->s_magic = SERVICE_MAGIC);
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PJDLOG_ASSERT(sconn->sc_magic == SERVICE_CONNECTION_MAGIC);
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TAILQ_REMOVE(&service->s_connections, sconn, sc_next);
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sconn->sc_magic = 0;
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nvlist_destroy(sconn->sc_limits);
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cap_close(sconn->sc_chan);
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free(sconn);
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}
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int
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service_connection_clone(struct service *service,
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struct service_connection *sconn)
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{
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struct service_connection *newsconn;
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int serrno, sock[2];
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if (socketpair(PF_UNIX, SOCK_STREAM | SOCK_NONBLOCK, 0, sock) < 0)
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return (-1);
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newsconn = service_connection_add(service, sock[0],
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service_connection_get_limits(sconn));
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if (newsconn == NULL) {
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serrno = errno;
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close(sock[0]);
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close(sock[1]);
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errno = serrno;
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return (-1);
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}
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return (sock[1]);
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}
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struct service_connection *
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service_connection_first(struct service *service)
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{
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struct service_connection *sconn;
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PJDLOG_ASSERT(service->s_magic = SERVICE_MAGIC);
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sconn = TAILQ_FIRST(&service->s_connections);
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PJDLOG_ASSERT(sconn == NULL ||
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sconn->sc_magic == SERVICE_CONNECTION_MAGIC);
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return (sconn);
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}
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struct service_connection *
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service_connection_next(struct service_connection *sconn)
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{
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PJDLOG_ASSERT(sconn->sc_magic == SERVICE_CONNECTION_MAGIC);
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sconn = TAILQ_NEXT(sconn, sc_next);
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PJDLOG_ASSERT(sconn == NULL ||
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sconn->sc_magic == SERVICE_CONNECTION_MAGIC);
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return (sconn);
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}
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cap_channel_t *
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service_connection_get_chan(const struct service_connection *sconn)
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{
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PJDLOG_ASSERT(sconn->sc_magic == SERVICE_CONNECTION_MAGIC);
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return (sconn->sc_chan);
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}
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int
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service_connection_get_sock(const struct service_connection *sconn)
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{
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PJDLOG_ASSERT(sconn->sc_magic == SERVICE_CONNECTION_MAGIC);
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return (cap_sock(sconn->sc_chan));
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}
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const nvlist_t *
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service_connection_get_limits(const struct service_connection *sconn)
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{
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PJDLOG_ASSERT(sconn->sc_magic == SERVICE_CONNECTION_MAGIC);
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return (sconn->sc_limits);
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}
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void
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service_connection_set_limits(struct service_connection *sconn,
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nvlist_t *limits)
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{
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PJDLOG_ASSERT(sconn->sc_magic == SERVICE_CONNECTION_MAGIC);
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nvlist_destroy(sconn->sc_limits);
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sconn->sc_limits = limits;
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}
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#if 0
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static void
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casper_message_connection(struct service *service, const nvlist_t *nvl)
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{
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service_connection_add(&service->s_connections,
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nvlist_get_descriptor(nvl, "sock"));
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}
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static void
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casper_message(const cap_channel_t *capcas, struct service *service)
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{
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const char *cmd;
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nvlist_t *nvl;
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nvl = cap_recv_nvlist(capcas);
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if (nvl == NULL)
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pjdlog_exit(1, "Unable to receive message from Casper");
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cmd = nvlist_get_string(nvl, "cmd");
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if (strcmp(cmd, "connection") == 0)
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casper_message_connection(service, nvl);
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else
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PJDLOG_ABORT("Unknown command from Casper: %s.", cmd);
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}
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#endif
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void
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service_message(struct service *service, struct service_connection *sconn)
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{
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nvlist_t *nvlin, *nvlout;
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const char *cmd;
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int error;
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nvlin = cap_recv_nvlist(service_connection_get_chan(sconn));
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if (nvlin == NULL) {
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if (errno == ENOTCONN) {
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pjdlog_debug(1, "Connection closed by the client.");
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} else {
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pjdlog_errno(LOG_ERR,
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"Unable to receive message from client");
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}
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service_connection_remove(service, sconn);
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return;
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}
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error = EDOOFUS;
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nvlout = nvlist_create(0);
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cmd = nvlist_get_string(nvlin, "cmd");
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pjdlog_debug(1, "Command received from client: %s.", cmd);
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if (pjdlog_debug_get() >= 2)
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nvlist_fdump(nvlin, stderr);
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if (strcmp(cmd, "limit_set") == 0) {
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nvlist_t *nvllim;
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nvllim = nvlist_take_nvlist(nvlin, "limits");
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error = service->s_limit(service_connection_get_limits(sconn),
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nvllim);
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if (error == 0) {
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service_connection_set_limits(sconn, nvllim);
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/* Function consumes nvllim. */
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} else {
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nvlist_destroy(nvllim);
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}
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} else if (strcmp(cmd, "limit_get") == 0) {
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const nvlist_t *nvllim;
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nvllim = service_connection_get_limits(sconn);
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if (nvllim != NULL)
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nvlist_add_nvlist(nvlout, "limits", nvllim);
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else
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nvlist_add_null(nvlout, "limits");
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error = 0;
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} else if (strcmp(cmd, "clone") == 0) {
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int sock;
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sock = service_connection_clone(service, sconn);
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if (sock == -1) {
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error = errno;
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} else {
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nvlist_add_descriptor(nvlout, "sock", sock);
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error = 0;
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}
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} else {
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nvlout = nvlist_create(0);
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error = service->s_command(cmd,
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service_connection_get_limits(sconn), nvlin, nvlout);
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}
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nvlist_destroy(nvlin);
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nvlist_add_number(nvlout, "error", (uint64_t)error);
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pjdlog_debug(1, "Sending reply to client (error=%d).", error);
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if (pjdlog_debug_get() >= 2)
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nvlist_fdump(nvlout, stderr);
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if (cap_send_nvlist(service_connection_get_chan(sconn), nvlout) == -1) {
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pjdlog_errno(LOG_ERR, "Unable to send message to client");
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service_connection_remove(service, sconn);
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return;
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}
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}
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static int
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fd_add(fd_set *fdsp, int maxfd, int fd)
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{
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FD_SET(fd, fdsp);
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return (fd > maxfd ? fd : maxfd);
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}
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int
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service_start(const char *name, int sock, service_limit_func_t *limitfunc,
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service_command_func_t *commandfunc, int argc, char *argv[])
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{
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struct service *service;
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struct service_connection *sconn, *sconntmp;
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fd_set fds;
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int maxfd, nfds, serrno;
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assert(argc == 2);
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pjdlog_init(PJDLOG_MODE_STD);
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pjdlog_debug_set(atoi(argv[1]));
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service = service_alloc(name, limitfunc, commandfunc);
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if (service == NULL)
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return (errno);
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if (service_connection_add(service, sock, NULL) == NULL) {
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serrno = errno;
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service_free(service);
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return (serrno);
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}
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for (;;) {
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FD_ZERO(&fds);
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maxfd = -1;
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for (sconn = service_connection_first(service); sconn != NULL;
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sconn = service_connection_next(sconn)) {
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maxfd = fd_add(&fds, maxfd,
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service_connection_get_sock(sconn));
|
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}
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PJDLOG_ASSERT(maxfd >= 0);
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PJDLOG_ASSERT(maxfd + 1 <= (int)FD_SETSIZE);
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nfds = select(maxfd + 1, &fds, NULL, NULL, NULL);
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if (nfds < 0) {
|
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if (errno != EINTR)
|
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pjdlog_errno(LOG_ERR, "select() failed");
|
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continue;
|
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} else if (nfds == 0) {
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/* Timeout. */
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PJDLOG_ABORT("select() timeout");
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continue;
|
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}
|
||||
|
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for (sconn = service_connection_first(service); sconn != NULL;
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sconn = sconntmp) {
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/*
|
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* Prepare for connection to be removed from the list
|
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* on failure.
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*/
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sconntmp = service_connection_next(sconn);
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if (FD_ISSET(service_connection_get_sock(sconn), &fds))
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service_message(service, sconn);
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}
|
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if (service_connection_first(service) == NULL) {
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/*
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* No connections left, exiting.
|
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*/
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break;
|
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}
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}
|
||||
|
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return (0);
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}
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70
lib/libcasper/libcasper.h
Normal file
70
lib/libcasper/libcasper.h
Normal file
@ -0,0 +1,70 @@
|
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/*-
|
||||
* Copyright (c) 2013 The FreeBSD Foundation
|
||||
* All rights reserved.
|
||||
*
|
||||
* This software was developed by Pawel Jakub Dawidek under sponsorship from
|
||||
* the FreeBSD Foundation.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in the
|
||||
* documentation and/or other materials provided with the distribution.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
|
||||
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||||
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
|
||||
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||||
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||||
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||||
* SUCH DAMAGE.
|
||||
*
|
||||
* $FreeBSD$
|
||||
*/
|
||||
|
||||
#ifndef _LIBCASPER_H_
|
||||
#define _LIBCASPER_H_
|
||||
|
||||
#ifndef _NVLIST_T_DECLARED
|
||||
#define _NVLIST_T_DECLARED
|
||||
struct nvlist;
|
||||
|
||||
typedef struct nvlist nvlist_t;
|
||||
#endif
|
||||
|
||||
#define PARENT_FILENO 3
|
||||
#define EXECUTABLE_FILENO 4
|
||||
#define PROC_FILENO 5
|
||||
|
||||
struct service;
|
||||
struct service_connection;
|
||||
|
||||
typedef int service_limit_func_t(const nvlist_t *, const nvlist_t *);
|
||||
typedef int service_command_func_t(const char *cmd, const nvlist_t *,
|
||||
nvlist_t *, nvlist_t *);
|
||||
|
||||
struct service_connection *service_connection_add(struct service *service,
|
||||
int sock, const nvlist_t *limits);
|
||||
void service_connection_remove(struct service *service,
|
||||
struct service_connection *sconn);
|
||||
int service_connection_clone(struct service *service,
|
||||
struct service_connection *sconn);
|
||||
struct service_connection *service_connection_first(struct service *service);
|
||||
struct service_connection *service_connection_next(struct service_connection *sconn);
|
||||
cap_channel_t *service_connection_get_chan(const struct service_connection *sconn);
|
||||
int service_connection_get_sock(const struct service_connection *sconn);
|
||||
const nvlist_t *service_connection_get_limits(const struct service_connection *sconn);
|
||||
void service_connection_set_limits(struct service_connection *sconn,
|
||||
nvlist_t *limits);
|
||||
|
||||
int service_start(const char *name, int sock, service_limit_func_t *limitfunc,
|
||||
service_command_func_t *commandfunc, int argc, char *argv[]);
|
||||
|
||||
#endif /* !_LIBCASPER_H_ */
|
||||
46
lib/libcasper/libcasper_impl.h
Normal file
46
lib/libcasper/libcasper_impl.h
Normal file
@ -0,0 +1,46 @@
|
||||
/*-
|
||||
* Copyright (c) 2013 The FreeBSD Foundation
|
||||
* All rights reserved.
|
||||
*
|
||||
* This software was developed by Pawel Jakub Dawidek under sponsorship from
|
||||
* the FreeBSD Foundation.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in the
|
||||
* documentation and/or other materials provided with the distribution.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
|
||||
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||||
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
|
||||
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||||
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||||
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||||
* SUCH DAMAGE.
|
||||
*
|
||||
* $FreeBSD$
|
||||
*/
|
||||
|
||||
#ifndef _LIBCASPER_IMPL_H_
|
||||
#define _LIBCASPER_IMPL_H_
|
||||
|
||||
#include "libcasper.h"
|
||||
|
||||
struct service;
|
||||
struct service_connection;
|
||||
|
||||
struct service * service_alloc(const char *name,
|
||||
service_limit_func_t *limitfunc, service_command_func_t *commandfunc);
|
||||
void service_free(struct service *service);
|
||||
|
||||
void service_message(struct service *service, struct service_connection *sconn);
|
||||
|
||||
#endif /* !_LIBCASPER_IMPL_H_ */
|
||||
Loading…
Reference in New Issue
Block a user