1 /* 2 * AppArmor security module 3 * 4 * This file contains AppArmor auditing functions 5 * 6 * Copyright (C) 1998-2008 Novell/SUSE 7 * Copyright 2009-2010 Canonical Ltd. 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License as 11 * published by the Free Software Foundation, version 2 of the 12 * License. 13 */ 14 15 #include <linux/audit.h> 16 #include <linux/socket.h> 17 18 #include "include/apparmor.h" 19 #include "include/audit.h" 20 #include "include/policy.h" 21 #include "include/policy_ns.h" 22 23 24 const char *const audit_mode_names[] = { 25 "normal", 26 "quiet_denied", 27 "quiet", 28 "noquiet", 29 "all" 30 }; 31 32 static const char *const aa_audit_type[] = { 33 "AUDIT", 34 "ALLOWED", 35 "DENIED", 36 "HINT", 37 "STATUS", 38 "ERROR", 39 "KILLED", 40 "AUTO" 41 }; 42 43 /* 44 * Currently AppArmor auditing is fed straight into the audit framework. 45 * 46 * TODO: 47 * netlink interface for complain mode 48 * user auditing, - send user auditing to netlink interface 49 * system control of whether user audit messages go to system log 50 */ 51 52 /** 53 * audit_base - core AppArmor function. 54 * @ab: audit buffer to fill (NOT NULL) 55 * @ca: audit structure containing data to audit (NOT NULL) 56 * 57 * Record common AppArmor audit data from @sa 58 */ 59 static void audit_pre(struct audit_buffer *ab, void *ca) 60 { 61 struct common_audit_data *sa = ca; 62 63 if (aa_g_audit_header) { 64 audit_log_format(ab, "apparmor="); 65 audit_log_string(ab, aa_audit_type[aad(sa)->type]); 66 } 67 68 if (aad(sa)->op) { 69 audit_log_format(ab, " operation="); 70 audit_log_string(ab, aad(sa)->op); 71 } 72 73 if (aad(sa)->info) { 74 audit_log_format(ab, " info="); 75 audit_log_string(ab, aad(sa)->info); 76 if (aad(sa)->error) 77 audit_log_format(ab, " error=%d", aad(sa)->error); 78 } 79 80 if (aad(sa)->profile) { 81 struct aa_profile *profile = aad(sa)->profile; 82 if (profile->ns != root_ns) { 83 audit_log_format(ab, " namespace="); 84 audit_log_untrustedstring(ab, profile->ns->base.hname); 85 } 86 audit_log_format(ab, " profile="); 87 audit_log_untrustedstring(ab, profile->base.hname); 88 } 89 90 if (aad(sa)->name) { 91 audit_log_format(ab, " name="); 92 audit_log_untrustedstring(ab, aad(sa)->name); 93 } 94 } 95 96 /** 97 * aa_audit_msg - Log a message to the audit subsystem 98 * @sa: audit event structure (NOT NULL) 99 * @cb: optional callback fn for type specific fields (MAYBE NULL) 100 */ 101 void aa_audit_msg(int type, struct common_audit_data *sa, 102 void (*cb) (struct audit_buffer *, void *)) 103 { 104 aad(sa)->type = type; 105 common_lsm_audit(sa, audit_pre, cb); 106 } 107 108 /** 109 * aa_audit - Log a profile based audit event to the audit subsystem 110 * @type: audit type for the message 111 * @profile: profile to check against (NOT NULL) 112 * @sa: audit event (NOT NULL) 113 * @cb: optional callback fn for type specific fields (MAYBE NULL) 114 * 115 * Handle default message switching based off of audit mode flags 116 * 117 * Returns: error on failure 118 */ 119 int aa_audit(int type, struct aa_profile *profile, struct common_audit_data *sa, 120 void (*cb) (struct audit_buffer *, void *)) 121 { 122 AA_BUG(!profile); 123 124 if (type == AUDIT_APPARMOR_AUTO) { 125 if (likely(!aad(sa)->error)) { 126 if (AUDIT_MODE(profile) != AUDIT_ALL) 127 return 0; 128 type = AUDIT_APPARMOR_AUDIT; 129 } else if (COMPLAIN_MODE(profile)) 130 type = AUDIT_APPARMOR_ALLOWED; 131 else 132 type = AUDIT_APPARMOR_DENIED; 133 } 134 if (AUDIT_MODE(profile) == AUDIT_QUIET || 135 (type == AUDIT_APPARMOR_DENIED && 136 AUDIT_MODE(profile) == AUDIT_QUIET)) 137 return aad(sa)->error; 138 139 if (KILL_MODE(profile) && type == AUDIT_APPARMOR_DENIED) 140 type = AUDIT_APPARMOR_KILL; 141 142 if (!unconfined(profile)) 143 aad(sa)->profile = profile; 144 145 aa_audit_msg(type, sa, cb); 146 147 if (aad(sa)->type == AUDIT_APPARMOR_KILL) 148 (void)send_sig_info(SIGKILL, NULL, 149 sa->type == LSM_AUDIT_DATA_TASK && sa->u.tsk ? 150 sa->u.tsk : current); 151 152 if (aad(sa)->type == AUDIT_APPARMOR_ALLOWED) 153 return complain_error(aad(sa)->error); 154 155 return aad(sa)->error; 156 } 157