src/lxc/lxcseccomp.h

   1 /*
   2  * lxc: linux Container library
   3  *
   4  * (C) Copyright Canonical, Inc. 2012
   5  *
   6  * Authors:
   7  * Serge Hallyn <serge.hallyn@canonical.com>
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2.1 of the License, or (at your option) any later version.
  13  *
  14  * This library is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with this library; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  22  */
  23
  24 #ifndef __LXC_LXCSECCOMP_H
  25 #define __LXC_LXCSECCOMP_H
  26
  27 #ifndef _GNU_SOURCE
  28 #define _GNU_SOURCE 1
  29 #endif
  30 #include <errno.h>
  31 #ifdef HAVE_SECCOMP
  32 #include <linux/seccomp.h>
  33 #include <seccomp.h>
  34 #endif
  35 #if HAVE_DECL_SECCOMP_NOTIF_GET_FD
  36 #include <sys/socket.h>
  37 #include <sys/un.h>
  38 #endif
  39
  40 #include "conf.h"
  41 #include "config.h"
  42 #include "memory_utils.h"
  43
  44 struct lxc_conf;
  45 struct lxc_epoll_descr;
  46 struct lxc_handler;
  47
  48 #ifdef HAVE_SECCOMP
  49
  50 #if HAVE_DECL_SECCOMP_NOTIF_GET_FD
  51 struct seccomp_notify {
  52         bool wants_supervision;
  53         int notify_fd;
  54         int proxy_fd;
  55         struct sockaddr_un proxy_addr;
  56         struct seccomp_notif *req_buf;
  57         struct seccomp_notif_resp *rsp_buf;
  58 };
  59
  60 #define HAVE_SECCOMP_NOTIFY 1
  61
  62 #endif /* HAVE_DECL_SECCOMP_NOTIF_GET_FD */
  63
  64 struct lxc_seccomp {
  65         char *seccomp;
  66 #if HAVE_SCMP_FILTER_CTX
  67         unsigned int allow_nesting;
  68         scmp_filter_ctx seccomp_ctx;
  69 #endif /* HAVE_SCMP_FILTER_CTX */
  70
  71 #if HAVE_DECL_SECCOMP_NOTIF_GET_FD
  72         struct seccomp_notify notifier;
  73 #endif /* HAVE_DECL_SECCOMP_NOTIF_GET_FD */
  74 };
  75
  76 extern int lxc_seccomp_load(struct lxc_conf *conf);
  77 extern int lxc_read_seccomp_config(struct lxc_conf *conf);
  78 extern void lxc_seccomp_free(struct lxc_seccomp *seccomp);
  79 extern int seccomp_notify_handler(int fd, uint32_t events, void *data,
  80                                   struct lxc_epoll_descr *descr);
  81 extern void seccomp_conf_init(struct lxc_conf *conf);
  82 extern int lxc_seccomp_setup_notifier(struct lxc_seccomp *seccomp,
  83                                       struct lxc_epoll_descr *descr,
  84                                       struct lxc_handler *handler);
  85 extern int lxc_seccomp_send_notifier_fd(struct lxc_seccomp *seccomp,
  86                                         int socket_fd);
  87 extern int lxc_seccomp_recv_notifier_fd(struct lxc_seccomp *seccomp,
  88                                         int socket_fd);
  89 extern int lxc_seccomp_add_notifier(const char *name, const char *lxcpath,
  90                                     struct lxc_seccomp *seccomp);
  91 static inline int lxc_seccomp_get_notify_fd(struct lxc_seccomp *seccomp)
  92 {
  93 #if HAVE_DECL_SECCOMP_NOTIF_GET_FD
  94         return seccomp->notifier.notify_fd;
  95 #else
  96         errno = ENOSYS;
  97         return -EBADF;
  98 #endif
  99 }
 100
 101 #else /* HAVE_SECCOMP */
 102
 103 struct lxc_seccomp {
 104         char *seccomp;
 105 };
 106
 107 static inline int lxc_seccomp_load(struct lxc_conf *conf)
 108 {
 109         return 0;
 110 }
 111
 112 static inline int lxc_read_seccomp_config(struct lxc_conf *conf)
 113 {
 114         return 0;
 115 }
 116
 117 static inline void lxc_seccomp_free(struct lxc_seccomp *seccomp)
 118 {
 119         free_disarm(seccomp->seccomp);
 120 }
 121
 122 static inline int seccomp_notify_handler(int fd, uint32_t events, void *data,
 123                                   struct lxc_epoll_descr *descr)
 124 {
 125         return -ENOSYS;
 126 }
 127
 128 static inline void seccomp_conf_init(struct lxc_conf *conf)
 129 {
 130 }
 131
 132 static inline int lxc_seccomp_setup_notifier(struct lxc_seccomp *seccomp,
 133                                              struct lxc_epoll_descr *descr,
 134                                              struct lxc_handler *handler)
 135 {
 136         return 0;
 137 }
 138
 139 static inline int lxc_seccomp_send_notifier_fd(struct lxc_seccomp *seccomp,
 140                                                int socket_fd)
 141 {
 142         return 0;
 143 }
 144
 145 static inline int lxc_seccomp_recv_notifier_fd(struct lxc_seccomp *seccomp,
 146                                         int socket_fd)
 147 {
 148         return 0;
 149 }
 150
 151 static inline int lxc_seccomp_add_notifier(const char *name, const char *lxcpath,
 152                                            struct lxc_seccomp *seccomp)
 153 {
 154         return 0;
 155 }
 156
 157 static inline int lxc_seccomp_get_notify_fd(struct lxc_seccomp *seccomp)
 158 {
 159         return -EBADF;
 160 }
 161
 162 #endif /* HAVE_SECCOMP */
 163 #endif /* __LXC_LXCSECCOMP_H */