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 * ssh_sandbox_init(struct monitor * monitor)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 ssh_sandbox_child(struct ssh_sandbox * box)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 void ssh_sandbox_parent_finish(struct ssh_sandbox * box)101 ssh_sandbox_parent_finish(struct ssh_sandbox *box) 102 { 103 priv_freeset(box->pset); 104 box->pset = NULL; 105 free(box); 106 } 107 108 void ssh_sandbox_parent_preauth(struct ssh_sandbox * box,pid_t child_pid)109 ssh_sandbox_parent_preauth(struct ssh_sandbox *box, pid_t child_pid) 110 { 111 /* Nothing to do here */ 112 } 113 114 #endif /* SANDBOX_SOLARIS */ 115