1 /*- 2 * Copyright (c) 2004-2009 Apple Inc. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of Apple Inc. ("Apple") nor the names of 14 * its contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR 21 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 25 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 26 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 27 * POSSIBILITY OF SUCH DAMAGE. 28 * 29 * $P4: //depot/projects/trustedbsd/openbsm/libbsm/bsm_notify.c#17 $ 30 */ 31 32 /* 33 * Based on sample code from Marc Majka. 34 */ 35 #include <sys/types.h> 36 37 #include <config/config.h> 38 #ifdef HAVE_FULL_QUEUE_H 39 #include <sys/queue.h> 40 #else /* !HAVE_FULL_QUEUE_H */ 41 #include <compat/queue.h> 42 #endif /* !HAVE_FULL_QUEUE_H */ 43 44 #include <bsm/audit_internal.h> 45 #include <bsm/libbsm.h> 46 47 #include <errno.h> 48 #include <inttypes.h> 49 #include <stdarg.h> 50 #include <string.h> 51 #include <syslog.h> 52 53 54 #ifdef __APPLE__ 55 #include <notify.h> 56 /* If 1, assumes a kernel that sends the right notification. */ 57 #define AUDIT_NOTIFICATION_ENABLED 1 58 59 #if AUDIT_NOTIFICATION_ENABLED 60 static int token = 0; 61 #endif /* AUDIT_NOTIFICATION_ENABLED */ 62 63 static int au_cond = AUC_UNSET; /* <bsm/audit.h> */ 64 65 uint32_t 66 au_notify_initialize(void) 67 { 68 #if AUDIT_NOTIFICATION_ENABLED 69 uint32_t status; 70 int ignore_first; 71 72 status = notify_register_check(__BSM_INTERNAL_NOTIFY_KEY, &token); 73 if (status != NOTIFY_STATUS_OK) 74 return (status); 75 status = notify_check(token, &ignore_first); 76 if (status != NOTIFY_STATUS_OK) 77 return (status); 78 #endif 79 80 if (audit_get_cond(&au_cond) != 0) { 81 syslog(LOG_ERR, "Initial audit status check failed (%s)", 82 strerror(errno)); 83 if (errno == ENOSYS) /* auditon() unimplemented. */ 84 return (AU_UNIMPL); 85 return (NOTIFY_STATUS_FAILED); /* Is there a better code? */ 86 } 87 return (NOTIFY_STATUS_OK); 88 } 89 90 int 91 au_notify_terminate(void) 92 { 93 94 #if AUDIT_NOTIFICATION_ENABLED 95 return ((notify_cancel(token) == NOTIFY_STATUS_OK) ? 0 : -1); 96 #else 97 return (0); 98 #endif 99 } 100 101 /* 102 * On error of any notify(3) call, reset 'au_cond' to ensure we re-run 103 * au_notify_initialize() next time 'round--but assume auditing is on. This 104 * is a slight performance hit if auditing is off, but at least the system 105 * will behave correctly. The notification calls are unlikely to fail, 106 * anyway. 107 */ 108 int 109 au_get_state(void) 110 { 111 #if AUDIT_NOTIFICATION_ENABLED 112 int did_notify; 113 #endif 114 int status; 115 116 /* 117 * Don't make the client initialize this set of routines, but take the 118 * slight performance hit by checking ourselves every time. 119 */ 120 if (au_cond == AUC_UNSET) { 121 status = au_notify_initialize(); 122 if (status != NOTIFY_STATUS_OK) { 123 if (status == AU_UNIMPL) 124 return (AU_UNIMPL); 125 return (AUC_AUDITING); 126 } else 127 return (au_cond); 128 } 129 #if AUDIT_NOTIFICATION_ENABLED 130 status = notify_check(token, &did_notify); 131 if (status != NOTIFY_STATUS_OK) { 132 au_cond = AUC_UNSET; 133 return (AUC_AUDITING); 134 } 135 136 if (did_notify == 0) 137 return (au_cond); 138 #endif 139 140 if (audit_get_cond(&au_cond) != 0) { 141 /* XXX Reset au_cond to AUC_UNSET? */ 142 syslog(LOG_ERR, "Audit status check failed (%s)", 143 strerror(errno)); 144 if (errno == ENOSYS) /* Function unimplemented. */ 145 return (AU_UNIMPL); 146 return (errno); 147 } 148 149 switch (au_cond) { 150 case AUC_NOAUDIT: /* Auditing suspended. */ 151 case AUC_DISABLED: /* Auditing shut off. */ 152 return (AUC_NOAUDIT); 153 154 case AUC_UNSET: /* Uninitialized; shouldn't get here. */ 155 case AUC_AUDITING: /* Audit on. */ 156 default: 157 return (AUC_AUDITING); 158 } 159 } 160 #endif /* !__APPLE__ */ 161 162 int 163 cannot_audit(int val __unused) 164 { 165 #ifdef __APPLE__ 166 return (!(au_get_state() == AUC_AUDITING)); 167 #else 168 int cond; 169 170 if (audit_get_cond(&cond) != 0) { 171 if (errno != ENOSYS) { 172 syslog(LOG_ERR, "Audit status check failed (%s)", 173 strerror(errno)); 174 } 175 return (1); 176 } 177 if (cond == AUC_NOAUDIT || cond == AUC_DISABLED) 178 return (1); 179 return (0); 180 #endif /* !__APPLE__ */ 181 } 182