597df30e62
contrib/openbsm and a subset also imported into sys/security/audit. This patch release addresses several minor issues: - Fixes to AUT_SOCKUNIX token parsing. - IPv6 support for au_to_me(3). - Improved robustness in the parsing of audit_control, especially long flags/naflags strings and whitespace in all fields. - Add missing conversion of a number of FreeBSD/Mac OS X errnos to/from BSM error number space. MFC after: 3 weeks Obtained from: TrustedBSD Project Sponsored by: Apple, Inc. Approved by: re (kib)
747 lines
15 KiB
C
747 lines
15 KiB
C
/*-
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* Copyright (c) 2004, 2009 Apple Inc.
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* Copyright (c) 2006 Robert N. M. Watson
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of Apple Inc. ("Apple") nor the names of
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* its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* $P4: //depot/projects/trustedbsd/openbsm/libbsm/bsm_control.c#34 $
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*/
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#include <config/config.h>
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#include <bsm/libbsm.h>
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#include <ctype.h>
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#include <errno.h>
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#include <string.h>
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#ifdef HAVE_PTHREAD_MUTEX_LOCK
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#include <pthread.h>
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#ifndef HAVE_STRLCAT
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#include <compat/strlcat.h>
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#endif
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#ifndef HAVE_STRLCPY
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#include <compat/strlcpy.h>
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#endif
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#include <sys/stat.h>
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/*
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* Parse the contents of the audit_control file to return the audit control
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* parameters. These static fields are protected by 'mutex'.
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*/
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static FILE *fp = NULL;
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static char linestr[AU_LINE_MAX];
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static char *delim = ":";
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static char inacdir = 0;
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static char ptrmoved = 0;
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#ifdef HAVE_PTHREAD_MUTEX_LOCK
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static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
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#endif
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/*
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* Audit policy string token table for au_poltostr() and au_strtopol().
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*/
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struct audit_polstr {
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long ap_policy;
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const char *ap_str;
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};
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static struct audit_polstr au_polstr[] = {
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{ AUDIT_CNT, "cnt" },
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{ AUDIT_AHLT, "ahlt" },
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{ AUDIT_ARGV, "argv" },
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{ AUDIT_ARGE, "arge" },
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{ AUDIT_SEQ, "seq" },
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{ AUDIT_WINDATA, "windata" },
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{ AUDIT_USER, "user" },
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{ AUDIT_GROUP, "group" },
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{ AUDIT_TRAIL, "trail" },
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{ AUDIT_PATH, "path" },
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{ AUDIT_SCNT, "scnt" },
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{ AUDIT_PUBLIC, "public" },
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{ AUDIT_ZONENAME, "zonename" },
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{ AUDIT_PERZONE, "perzone" },
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{ -1, NULL }
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};
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/*
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* Returns the string value corresponding to the given label from the
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* configuration file.
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*
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* Must be called with mutex held.
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*/
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static int
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getstrfromtype_locked(char *name, char **str)
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{
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char *type, *nl;
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char *tokptr;
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char *last;
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*str = NULL;
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if ((fp == NULL) && ((fp = fopen(AUDIT_CONTROL_FILE, "r")) == NULL))
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return (-1); /* Error */
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while (1) {
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if (fgets(linestr, AU_LINE_MAX, fp) == NULL) {
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if (ferror(fp))
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return (-1);
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return (0); /* EOF */
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}
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if (linestr[0] == '#')
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continue;
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/* Remove trailing new line character and white space. */
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nl = strchr(linestr, '\0') - 1;
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while (nl >= linestr && ('\n' == *nl || ' ' == *nl ||
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'\t' == *nl)) {
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*nl = '\0';
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nl--;
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}
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tokptr = linestr;
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if ((type = strtok_r(tokptr, delim, &last)) != NULL) {
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if (strcmp(name, type) == 0) {
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/* Found matching name. */
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*str = strtok_r(NULL, delim, &last);
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if (*str == NULL) {
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errno = EINVAL;
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return (-1); /* Parse error in file */
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}
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return (0); /* Success */
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}
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}
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}
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}
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/*
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* Convert a given time value with a multiplier (seconds, hours, days, years) to
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* seconds. Return 0 on success.
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*/
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static int
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au_timetosec(time_t *seconds, u_long value, char mult)
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{
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if (NULL == seconds)
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return (-1);
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switch(mult) {
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case 's':
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/* seconds */
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*seconds = (time_t)value;
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break;
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case 'h':
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/* hours */
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*seconds = (time_t)value * 60 * 60;
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break;
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case 'd':
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/* days */
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*seconds = (time_t)value * 60 * 60 * 24;
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break;
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case 'y':
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/* years. Add a day for each 4th (leap) year. */
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*seconds = (time_t)value * 60 * 60 * 24 * 364 +
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((time_t)value / 4) * 60 * 60 * 24;
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break;
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default:
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return (-1);
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}
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return (0);
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}
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/*
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* Convert a given disk space value with a multiplier (bytes, kilobytes,
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* megabytes, gigabytes) to bytes. Return 0 on success.
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*/
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static int
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au_spacetobytes(size_t *bytes, u_long value, char mult)
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{
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if (NULL == bytes)
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return (-1);
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switch(mult) {
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case 'B':
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case ' ':
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/* Bytes */
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*bytes = (size_t)value;
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break;
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case 'K':
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/* Kilobytes */
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*bytes = (size_t)value * 1024;
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break;
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case 'M':
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/* Megabytes */
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*bytes = (size_t)value * 1024 * 1024;
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break;
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case 'G':
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/* Gigabytes */
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*bytes = (size_t)value * 1024 * 1024 * 1024;
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break;
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default:
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return (-1);
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}
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return (0);
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}
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/*
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* Convert a policy to a string. Return -1 on failure, or >= 0 representing
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* the actual size of the string placed in the buffer (excluding terminating
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* nul).
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*/
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ssize_t
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au_poltostr(int policy, size_t maxsize, char *buf)
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{
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int first = 1;
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int i = 0;
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if (maxsize < 1)
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return (-1);
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buf[0] = '\0';
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do {
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if (policy & au_polstr[i].ap_policy) {
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if (!first && strlcat(buf, ",", maxsize) >= maxsize)
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return (-1);
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if (strlcat(buf, au_polstr[i].ap_str, maxsize) >=
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maxsize)
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return (-1);
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first = 0;
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}
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} while (NULL != au_polstr[++i].ap_str);
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return (strlen(buf));
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}
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/*
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* Convert a string to a policy. Return -1 on failure (with errno EINVAL,
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* ENOMEM) or 0 on success.
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*/
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int
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au_strtopol(const char *polstr, int *policy)
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{
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char *bufp, *string;
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char *buffer;
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int i, matched;
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*policy = 0;
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buffer = strdup(polstr);
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if (buffer == NULL)
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return (-1);
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bufp = buffer;
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while ((string = strsep(&bufp, ",")) != NULL) {
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matched = i = 0;
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do {
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if (strcmp(string, au_polstr[i].ap_str) == 0) {
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*policy |= au_polstr[i].ap_policy;
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matched = 1;
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break;
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}
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} while (NULL != au_polstr[++i].ap_str);
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if (!matched) {
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free(buffer);
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errno = EINVAL;
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return (-1);
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}
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}
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free(buffer);
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return (0);
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}
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/*
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* Rewind the file pointer to beginning.
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*/
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static void
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setac_locked(void)
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{
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static time_t lastctime = 0;
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struct stat sbuf;
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ptrmoved = 1;
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if (fp != NULL) {
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/*
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* Check to see if the file on disk has changed. If so,
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* force a re-read of the file by closing it.
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*/
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if (fstat(fileno(fp), &sbuf) < 0)
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goto closefp;
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if (lastctime != sbuf.st_ctime) {
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lastctime = sbuf.st_ctime;
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closefp:
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fclose(fp);
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fp = NULL;
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return;
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}
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fseek(fp, 0, SEEK_SET);
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}
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}
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void
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setac(void)
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{
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#ifdef HAVE_PTHREAD_MUTEX_LOCK
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pthread_mutex_lock(&mutex);
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#endif
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setac_locked();
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#ifdef HAVE_PTHREAD_MUTEX_LOCK
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pthread_mutex_unlock(&mutex);
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#endif
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}
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/*
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* Close the audit_control file.
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*/
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void
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endac(void)
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{
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#ifdef HAVE_PTHREAD_MUTEX_LOCK
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pthread_mutex_lock(&mutex);
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#endif
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ptrmoved = 1;
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if (fp != NULL) {
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fclose(fp);
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fp = NULL;
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}
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#ifdef HAVE_PTHREAD_MUTEX_LOCK
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pthread_mutex_unlock(&mutex);
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#endif
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}
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/*
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* Return audit directory information from the audit control file.
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*/
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int
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getacdir(char *name, int len)
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{
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char *dir;
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int ret = 0;
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/*
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* Check if another function was called between successive calls to
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* getacdir.
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*/
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#ifdef HAVE_PTHREAD_MUTEX_LOCK
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pthread_mutex_lock(&mutex);
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#endif
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if (inacdir && ptrmoved) {
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ptrmoved = 0;
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if (fp != NULL)
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fseek(fp, 0, SEEK_SET);
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ret = 2;
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}
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if (getstrfromtype_locked(DIR_CONTROL_ENTRY, &dir) < 0) {
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#ifdef HAVE_PTHREAD_MUTEX_LOCK
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pthread_mutex_unlock(&mutex);
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#endif
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return (-2);
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}
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if (dir == NULL) {
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#ifdef HAVE_PTHREAD_MUTEX_LOCK
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pthread_mutex_unlock(&mutex);
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#endif
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return (-1);
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}
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if (strlen(dir) >= (size_t)len) {
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#ifdef HAVE_PTHREAD_MUTEX_LOCK
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pthread_mutex_unlock(&mutex);
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#endif
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return (-3);
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}
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strlcpy(name, dir, len);
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#ifdef HAVE_PTHREAD_MUTEX_LOCK
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pthread_mutex_unlock(&mutex);
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#endif
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return (ret);
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}
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/*
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* Return the minimum free diskspace value from the audit control file.
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*/
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int
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getacmin(int *min_val)
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{
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char *min;
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#ifdef HAVE_PTHREAD_MUTEX_LOCK
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pthread_mutex_lock(&mutex);
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#endif
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setac_locked();
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if (getstrfromtype_locked(MINFREE_CONTROL_ENTRY, &min) < 0) {
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#ifdef HAVE_PTHREAD_MUTEX_LOCK
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pthread_mutex_unlock(&mutex);
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#endif
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return (-2);
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}
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if (min == NULL) {
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#ifdef HAVE_PTHREAD_MUTEX_LOCK
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pthread_mutex_unlock(&mutex);
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#endif
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return (1);
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}
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*min_val = atoi(min);
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#ifdef HAVE_PTHREAD_MUTEX_LOCK
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pthread_mutex_unlock(&mutex);
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#endif
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return (0);
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}
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|
|
/*
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* Return the desired trail rotation size from the audit control file.
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*/
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int
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getacfilesz(size_t *filesz_val)
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|
{
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char *str;
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size_t val;
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char mult;
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int nparsed;
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|
|
|
#ifdef HAVE_PTHREAD_MUTEX_LOCK
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pthread_mutex_lock(&mutex);
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|
#endif
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setac_locked();
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if (getstrfromtype_locked(FILESZ_CONTROL_ENTRY, &str) < 0) {
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#ifdef HAVE_PTHREAD_MUTEX_LOCK
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pthread_mutex_unlock(&mutex);
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#endif
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return (-2);
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}
|
|
if (str == NULL) {
|
|
#ifdef HAVE_PTHREAD_MUTEX_LOCK
|
|
pthread_mutex_unlock(&mutex);
|
|
#endif
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errno = EINVAL;
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|
return (1);
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|
}
|
|
|
|
/* Trim off any leading white space. */
|
|
while (*str == ' ' || *str == '\t')
|
|
str++;
|
|
|
|
nparsed = sscanf(str, "%ju%c", (uintmax_t *)&val, &mult);
|
|
|
|
switch (nparsed) {
|
|
case 1:
|
|
/* If no multiplier then assume 'B' (bytes). */
|
|
mult = 'B';
|
|
/* fall through */
|
|
case 2:
|
|
if (au_spacetobytes(filesz_val, val, mult) == 0)
|
|
break;
|
|
/* fall through */
|
|
default:
|
|
errno = EINVAL;
|
|
#ifdef HAVE_PTHREAD_MUTEX_LOCK
|
|
pthread_mutex_unlock(&mutex);
|
|
#endif
|
|
return (-1);
|
|
}
|
|
|
|
/*
|
|
* The file size must either be 0 or >= MIN_AUDIT_FILE_SIZE. 0
|
|
* indicates no rotation size.
|
|
*/
|
|
if (*filesz_val < 0 || (*filesz_val > 0 &&
|
|
*filesz_val < MIN_AUDIT_FILE_SIZE)) {
|
|
#ifdef HAVE_PTHREAD_MUTEX_LOCK
|
|
pthread_mutex_unlock(&mutex);
|
|
#endif
|
|
filesz_val = 0L;
|
|
errno = EINVAL;
|
|
return (-1);
|
|
}
|
|
#ifdef HAVE_PTHREAD_MUTEX_LOCK
|
|
pthread_mutex_unlock(&mutex);
|
|
#endif
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Return the system audit value from the audit contol file.
|
|
*/
|
|
int
|
|
getacflg(char *auditstr, int len)
|
|
{
|
|
char *str;
|
|
|
|
#ifdef HAVE_PTHREAD_MUTEX_LOCK
|
|
pthread_mutex_lock(&mutex);
|
|
#endif
|
|
setac_locked();
|
|
if (getstrfromtype_locked(FLAGS_CONTROL_ENTRY, &str) < 0) {
|
|
#ifdef HAVE_PTHREAD_MUTEX_LOCK
|
|
pthread_mutex_unlock(&mutex);
|
|
#endif
|
|
return (-2);
|
|
}
|
|
if (str == NULL) {
|
|
#ifdef HAVE_PTHREAD_MUTEX_LOCK
|
|
pthread_mutex_unlock(&mutex);
|
|
#endif
|
|
return (1);
|
|
}
|
|
if (strlen(str) >= (size_t)len) {
|
|
#ifdef HAVE_PTHREAD_MUTEX_LOCK
|
|
pthread_mutex_unlock(&mutex);
|
|
#endif
|
|
return (-3);
|
|
}
|
|
strlcpy(auditstr, str, len);
|
|
#ifdef HAVE_PTHREAD_MUTEX_LOCK
|
|
pthread_mutex_unlock(&mutex);
|
|
#endif
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Return the non attributable flags from the audit contol file.
|
|
*/
|
|
int
|
|
getacna(char *auditstr, int len)
|
|
{
|
|
char *str;
|
|
|
|
#ifdef HAVE_PTHREAD_MUTEX_LOCK
|
|
pthread_mutex_lock(&mutex);
|
|
#endif
|
|
setac_locked();
|
|
if (getstrfromtype_locked(NA_CONTROL_ENTRY, &str) < 0) {
|
|
#ifdef HAVE_PTHREAD_MUTEX_LOCK
|
|
pthread_mutex_unlock(&mutex);
|
|
#endif
|
|
return (-2);
|
|
}
|
|
if (str == NULL) {
|
|
#ifdef HAVE_PTHREAD_MUTEX_LOCK
|
|
pthread_mutex_unlock(&mutex);
|
|
#endif
|
|
return (1);
|
|
}
|
|
if (strlen(str) >= (size_t)len) {
|
|
#ifdef HAVE_PTHREAD_MUTEX_LOCK
|
|
pthread_mutex_unlock(&mutex);
|
|
#endif
|
|
return (-3);
|
|
}
|
|
strlcpy(auditstr, str, len);
|
|
#ifdef HAVE_PTHREAD_MUTEX_LOCK
|
|
pthread_mutex_unlock(&mutex);
|
|
#endif
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Return the policy field from the audit control file.
|
|
*/
|
|
int
|
|
getacpol(char *auditstr, size_t len)
|
|
{
|
|
char *str;
|
|
|
|
#ifdef HAVE_PTHREAD_MUTEX_LOCK
|
|
pthread_mutex_lock(&mutex);
|
|
#endif
|
|
setac_locked();
|
|
if (getstrfromtype_locked(POLICY_CONTROL_ENTRY, &str) < 0) {
|
|
#ifdef HAVE_PTHREAD_MUTEX_LOCK
|
|
pthread_mutex_unlock(&mutex);
|
|
#endif
|
|
return (-2);
|
|
}
|
|
if (str == NULL) {
|
|
#ifdef HAVE_PTHREAD_MUTEX_LOCK
|
|
pthread_mutex_unlock(&mutex);
|
|
#endif
|
|
return (-1);
|
|
}
|
|
if (strlen(str) >= len) {
|
|
#ifdef HAVE_PTHREAD_MUTEX_LOCK
|
|
pthread_mutex_unlock(&mutex);
|
|
#endif
|
|
return (-3);
|
|
}
|
|
strlcpy(auditstr, str, len);
|
|
#ifdef HAVE_PTHREAD_MUTEX_LOCK
|
|
pthread_mutex_unlock(&mutex);
|
|
#endif
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
getachost(char *auditstr, size_t len)
|
|
{
|
|
char *str;
|
|
|
|
#ifdef HAVE_PTHREAD_MUTEX_LOCK
|
|
pthread_mutex_lock(&mutex);
|
|
#endif
|
|
setac_locked();
|
|
if (getstrfromtype_locked(AUDIT_HOST_CONTROL_ENTRY, &str) < 0) {
|
|
#ifdef HAVE_PTHREAD_MUTEX_LOCK
|
|
pthread_mutex_unlock(&mutex);
|
|
#endif
|
|
return (-2);
|
|
}
|
|
if (str == NULL) {
|
|
#ifdef HAVE_PTHREAD_MUTEX_LOCK
|
|
pthread_mutex_unlock(&mutex);
|
|
#endif
|
|
return (1);
|
|
}
|
|
if (strlen(str) >= len) {
|
|
#ifdef HAVE_PTHREAD_MUTEX_LOCK
|
|
pthread_mutex_unlock(&mutex);
|
|
#endif
|
|
return (-3);
|
|
}
|
|
strlcpy(auditstr, str, len);
|
|
#ifdef HAVE_PTHREAD_MUTEX_LOCK
|
|
pthread_mutex_unlock(&mutex);
|
|
#endif
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Set expiration conditions.
|
|
*/
|
|
static int
|
|
setexpirecond(time_t *age, size_t *size, u_long value, char mult)
|
|
{
|
|
|
|
if (isupper(mult) || ' ' == mult)
|
|
return (au_spacetobytes(size, value, mult));
|
|
else
|
|
return (au_timetosec(age, value, mult));
|
|
}
|
|
|
|
/*
|
|
* Return the expire-after field from the audit control file.
|
|
*/
|
|
int
|
|
getacexpire(int *andflg, time_t *age, size_t *size)
|
|
{
|
|
char *str;
|
|
int nparsed;
|
|
u_long val1, val2;
|
|
char mult1, mult2;
|
|
char andor[AU_LINE_MAX];
|
|
|
|
*age = 0L;
|
|
*size = 0LL;
|
|
*andflg = 0;
|
|
|
|
#ifdef HAVE_PTHREAD_MUTEX_LOCK
|
|
pthread_mutex_lock(&mutex);
|
|
#endif
|
|
setac_locked();
|
|
if (getstrfromtype_locked(EXPIRE_AFTER_CONTROL_ENTRY, &str) < 0) {
|
|
#ifdef HAVE_PTHREAD_MUTEX_LOCK
|
|
pthread_mutex_unlock(&mutex);
|
|
#endif
|
|
return (-2);
|
|
}
|
|
if (str == NULL) {
|
|
#ifdef HAVE_PTHREAD_MUTEX_LOCK
|
|
pthread_mutex_unlock(&mutex);
|
|
#endif
|
|
return (1);
|
|
}
|
|
|
|
/* First, trim off any leading white space. */
|
|
while (*str == ' ' || *str == '\t')
|
|
str++;
|
|
|
|
nparsed = sscanf(str, "%lu%c%[ \tadnorADNOR]%lu%c", &val1, &mult1,
|
|
andor, &val2, &mult2);
|
|
|
|
switch (nparsed) {
|
|
case 1:
|
|
/* If no multiplier then assume 'B' (Bytes). */
|
|
mult1 = 'B';
|
|
/* fall through */
|
|
case 2:
|
|
/* One expiration condition. */
|
|
if (setexpirecond(age, size, val1, mult1) != 0) {
|
|
#ifdef HAVE_PTHREAD_MUTEX_LOCK
|
|
pthread_mutex_unlock(&mutex);
|
|
#endif
|
|
return (-1);
|
|
}
|
|
break;
|
|
|
|
case 5:
|
|
/* Two expiration conditions. */
|
|
if (setexpirecond(age, size, val1, mult1) != 0 ||
|
|
setexpirecond(age, size, val2, mult2) != 0) {
|
|
#ifdef HAVE_PTHREAD_MUTEX_LOCK
|
|
pthread_mutex_unlock(&mutex);
|
|
#endif
|
|
return (-1);
|
|
}
|
|
if (strcasestr(andor, "and") != NULL)
|
|
*andflg = 1;
|
|
else if (strcasestr(andor, "or") != NULL)
|
|
*andflg = 0;
|
|
else {
|
|
#ifdef HAVE_PTHREAD_MUTEX_LOCK
|
|
pthread_mutex_unlock(&mutex);
|
|
#endif
|
|
return (-1);
|
|
}
|
|
break;
|
|
|
|
default:
|
|
#ifdef HAVE_PTHREAD_MUTEX_LOCK
|
|
pthread_mutex_unlock(&mutex);
|
|
#endif
|
|
return (-1);
|
|
}
|
|
|
|
#ifdef HAVE_PTHREAD_MUTEX_LOCK
|
|
pthread_mutex_unlock(&mutex);
|
|
#endif
|
|
return (0);
|
|
}
|