sandbox-solaris.c

   1 /*
   2  * Copyright (c) 2015 Joyent, Inc
   3  * Author: Alex Wilson <alex.wilson@joyent.com>
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 #include "includes.h"
  19
  20 #ifdef SANDBOX_SOLARIS
  21 #ifndef USE_SOLARIS_PRIVS
  22 # error "--with-solaris-privs must be used with the Solaris sandbox"
  23 #endif
  24
  25 #include <sys/types.h>
  26
  27 #include <errno.h>
  28 #include <stdarg.h>
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include <unistd.h>
  33 #ifdef HAVE_PRIV_H
  34 # include <priv.h>
  35 #endif
  36
  37 #include "log.h"
  38 #include "ssh-sandbox.h"
  39 #include "xmalloc.h"
  40
  41 struct ssh_sandbox {
  42         priv_set_t *pset;
  43 };
  44
  45 struct ssh_sandbox *
  46 ssh_sandbox_init(struct monitor *monitor)
  47 {
  48         struct ssh_sandbox *box = NULL;
  49
  50         box = xcalloc(1, sizeof(*box));
  51
  52         /* Start with "basic" and drop everything we don't need. */
  53         box->pset = solaris_basic_privset();
  54
  55         if (box->pset == NULL) {
  56                 free(box);
  57                 return NULL;
  58         }
  59
  60         /* Drop everything except the ability to use already-opened files */
  61         if (priv_delset(box->pset, PRIV_FILE_LINK_ANY) != 0 ||
  62 #ifdef PRIV_NET_ACCESS
  63             priv_delset(box->pset, PRIV_NET_ACCESS) != 0 ||
  64 #endif
  65 #ifdef PRIV_DAX_ACCESS
  66             priv_delset(box->pset, PRIV_DAX_ACCESS) != 0 ||
  67 #endif
  68 #ifdef PRIV_SYS_IB_INFO
  69             priv_delset(box->pset, PRIV_SYS_IB_INFO) != 0 ||
  70 #endif
  71             priv_delset(box->pset, PRIV_PROC_EXEC) != 0 ||
  72             priv_delset(box->pset, PRIV_PROC_FORK) != 0 ||
  73             priv_delset(box->pset, PRIV_PROC_INFO) != 0 ||
  74             priv_delset(box->pset, PRIV_PROC_SESSION) != 0) {
  75                 free(box);
  76                 return NULL;
  77         }
  78
  79         /* These may not be available on older Solaris-es */
  80 # if defined(PRIV_FILE_READ) && defined(PRIV_FILE_WRITE)
  81         if (priv_delset(box->pset, PRIV_FILE_READ) != 0 ||
  82             priv_delset(box->pset, PRIV_FILE_WRITE) != 0) {
  83                 free(box);
  84                 return NULL;
  85         }
  86 # endif
  87
  88         return box;
  89 }
  90
  91 void
  92 ssh_sandbox_child(struct ssh_sandbox *box)
  93 {
  94         if (setppriv(PRIV_SET, PRIV_PERMITTED, box->pset) != 0 ||
  95             setppriv(PRIV_SET, PRIV_LIMIT, box->pset) != 0 ||
  96             setppriv(PRIV_SET, PRIV_INHERITABLE, box->pset) != 0)
  97                 fatal("setppriv: %s", strerror(errno));
  98 }
  99
 100 #endif /* SANDBOX_SOLARIS */