system_cmds-597.1.1/login.tproj/login_audit.c

   1 /*
   2  * Copyright (c) 2005 Apple Computer, Inc.
   3  * All rights reserved.
   4  *
   5  * @APPLE_BSD_LICENSE_HEADER_START@
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1.  Redistributions of source code must retain the above copyright
  12  *     notice, this list of conditions and the following disclaimer.
  13  * 2.  Redistributions in binary form must reproduce the above copyright
  14  *     notice, this list of conditions and the following disclaimer in the
  15  *     documentation and/or other materials provided with the distribution.
  16  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
  17  *     its contributors may be used to endorse or promote products derived
  18  *     from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
  21  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  22  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  23  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
  24  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  25  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  26  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  27  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  29  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  *
  31  * @APPLE_BSD_LICENSE_HEADER_END@
  32  */
  33
  34 #ifdef USE_BSM_AUDIT
  35
  36 #include <sys/cdefs.h>
  37 __FBSDID("$FreeBSD: src/usr.bin/login/login_audit.c,v 1.2 2007/05/07 11:01:36 dwmalone Exp $");
  38
  39 #include <sys/types.h>
  40
  41 #include <bsm/libbsm.h>
  42 #include <bsm/audit_uevents.h>
  43 #include <bsm/audit_session.h>
  44
  45 #include <err.h>
  46 #include <errno.h>
  47 #include <pwd.h>
  48 #include <stdio.h>
  49 #include <stdlib.h>
  50 #include <strings.h>
  51 #include <unistd.h>
  52
  53 #include "login.h"
  54
  55 /*
  56  * Audit data
  57  */
  58 au_tid_addr_t tid;
  59
  60 /*
  61  * The following tokens are included in the audit record for a successful
  62  * login: header, subject, return.
  63  */
  64 void
  65 au_login_success(int fflag)
  66 {
  67         token_t *tok;
  68         int aufd;
  69         auditinfo_addr_t auinfo;
  70         uid_t uid = pwd->pw_uid;
  71         gid_t gid = pwd->pw_gid;
  72         pid_t pid = getpid();
  73         long au_cond;
  74
  75         /* Determine whether auditing is enabled. */
  76         if (auditon(A_GETCOND, &au_cond, sizeof(long)) < 0) {
  77                 if (errno == ENOSYS)
  78                         return;
  79                 errx(1, "login: Could not determine audit condition");
  80         }
  81
  82         /* Initialize with the current audit info. */
  83         if (getaudit_addr(&auinfo, sizeof(auinfo)) < 0) {
  84                 err(1, "getaudit_addr");
  85         }
  86         auinfo.ai_auid = pwd->pw_uid;
  87         memcpy(&auinfo.ai_termid, &tid, sizeof(auinfo.ai_termid));
  88
  89         /* Do the SessionCreate() equivalent. */
  90         if (!fflag) {
  91                 auinfo.ai_asid = AU_ASSIGN_ASID;
  92                 auinfo.ai_flags |= AU_SESSION_FLAG_HAS_TTY;
  93                 auinfo.ai_flags |= AU_SESSION_FLAG_HAS_AUTHENTICATED;
  94         }
  95
  96         if (au_cond != AUC_NOAUDIT) {
  97                 /* Compute and set the user's preselection mask. */
  98                 if (au_user_mask(pwd->pw_name, &auinfo.ai_mask) < 0) {
  99                         errx(1, "login: Could not set audit mask\n");
 100                 }
 101         }
 102
 103         if (setaudit_addr(&auinfo, sizeof(auinfo)) < 0)
 104                 err(1, "login: setaudit_addr failed");
 105
 106         char *session = NULL;
 107         asprintf(&session, "%x", auinfo.ai_asid);
 108         if (NULL == session) {
 109                 errx(1, "asprintf failed");
 110         }
 111         setenv("SECURITYSESSIONID", session, 1);
 112         free(session);
 113
 114         /* If we are not auditing, don't cut an audit record; just return. */
 115         if (au_cond == AUC_NOAUDIT)
 116                 return;
 117
 118         if ((aufd = au_open()) == -1)
 119                 errx(1,"login: Audit Error: au_open() failed");
 120
 121         if ((tok = au_to_subject32_ex(uid, geteuid(), getegid(), uid, gid, pid,
 122             pid, &tid)) == NULL)
 123                 errx(1, "login: Audit Error: au_to_subject32() failed");
 124         au_write(aufd, tok);
 125
 126         if ((tok = au_to_return32(0, 0)) == NULL)
 127                 errx(1, "login: Audit Error: au_to_return32() failed");
 128         au_write(aufd, tok);
 129
 130         if (au_close(aufd, 1, AUE_login) == -1)
 131                 errx(1, "login: Audit Record was not committed.");
 132 }
 133
 134 /*
 135  * The following tokens are included in the audit record for failed
 136  * login attempts: header, subject, text, return.
 137  */
 138 void
 139 au_login_fail(const char *errmsg, int na)
 140 {
 141         token_t *tok;
 142         int aufd;
 143         long au_cond;
 144         uid_t uid;
 145         gid_t gid;
 146         pid_t pid = getpid();
 147
 148         /* If we are not auditing, don't cut an audit record; just return. */
 149         if (auditon(A_GETCOND, &au_cond, sizeof(long)) < 0) {
 150                 if (errno == ENOSYS)
 151                         return;
 152                 errx(1, "login: Could not determine audit condition");
 153         }
 154         if (au_cond == AUC_NOAUDIT)
 155                 return;
 156
 157         if ((aufd = au_open()) == -1)
 158                 errx(1, "login: Audit Error: au_open() failed");
 159
 160         if (na) {
 161                 /*
 162                  * Non attributable event.  Assuming that login is not called
 163                  * within a user's session => auid,asid == -1.
 164                  */
 165                 if ((tok = au_to_subject32_ex(-1, geteuid(), getegid(), -1, -1,
 166                     pid, -1, &tid)) == NULL)
 167                         errx(1, "login: Audit Error: au_to_subject32() failed");
 168         } else {
 169                 /* We know the subject -- so use its value instead. */
 170                 uid = pwd->pw_uid;
 171                 gid = pwd->pw_gid;
 172                 if ((tok = au_to_subject32_ex(uid, geteuid(), getegid(), uid,
 173                     gid, pid, pid, &tid)) == NULL)
 174                         errx(1, "login: Audit Error: au_to_subject32() failed");
 175         }
 176         au_write(aufd, tok);
 177
 178         /* Include the error message. */
 179         if ((tok = au_to_text(errmsg)) == NULL)
 180                 errx(1, "login: Audit Error: au_to_text() failed");
 181         au_write(aufd, tok);
 182
 183         if ((tok = au_to_return32(1, errno)) == NULL)
 184                 errx(1, "login: Audit Error: au_to_return32() failed");
 185         au_write(aufd, tok);
 186
 187         if (au_close(aufd, 1, AUE_login) == -1)
 188                 errx(1, "login: Audit Error: au_close() was not committed");
 189 }
 190
 191 /*
 192  * The following tokens are included in the audit record for a logout:
 193  * header, subject, return.
 194  */
 195 void
 196 audit_logout(void)
 197 {
 198         token_t *tok;
 199         int aufd;
 200         uid_t uid = pwd->pw_uid;
 201         gid_t gid = pwd->pw_gid;
 202         pid_t pid = getpid();
 203         long au_cond;
 204
 205         /* If we are not auditing, don't cut an audit record; just return. */
 206         if (auditon(A_GETCOND, &au_cond, sizeof(long)) < 0) {
 207                 if (errno == ENOSYS)
 208                         return;
 209                 errx(1, "login: Could not determine audit condition");
 210         }
 211         if (au_cond == AUC_NOAUDIT)
 212                 return;
 213
 214         if ((aufd = au_open()) == -1)
 215                 errx(1, "login: Audit Error: au_open() failed");
 216
 217         /* The subject that is created (euid, egid of the current process). */
 218         if ((tok = au_to_subject32_ex(uid, geteuid(), getegid(), uid, gid, pid,
 219             pid, &tid)) == NULL)
 220                 errx(1, "login: Audit Error: au_to_subject32() failed");
 221         au_write(aufd, tok);
 222
 223         if ((tok = au_to_return32(0, 0)) == NULL)
 224                 errx(1, "login: Audit Error: au_to_return32() failed");
 225         au_write(aufd, tok);
 226
 227         if (au_close(aufd, 1, AUE_logout) == -1)
 228                 errx(1, "login: Audit Record was not committed.");
 229 }
 230
 231 #endif /* USE_BSM_AUDIT */