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audit(4): add tests for open(2) and openat(2)

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These syscalls are atypical, because each one corresponds to several
different audit events, and they each pass several different audit class
filters.

Submitted by:	aniketp
MFC after:	2 weeks
Sponsored by:	Google, Inc. (GSoC 2018)
Differential Revision:	https://reviews.freebsd.org/D15657
This commit is contained in:
Alan Somers 2018-06-05 20:13:24 +00:00
parent 9f855fb282
commit c41bbc0acb
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=334668
2 changed files with 194 additions and 0 deletions
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3
tests/sys/audit/Makefile
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@ -7,6 +7,7 @@ ATF_TESTS_C+= file-delete
ATF_TESTS_C+= file-close
ATF_TESTS_C+= file-write
ATF_TESTS_C+= file-read
ATF_TESTS_C+= open
SRCS.file-create+= file-create.c
SRCS.file-create+= utils.c
@ -18,6 +19,8 @@ SRCS.file-write+= file-write.c
SRCS.file-write+= utils.c
SRCS.file-read+= file-read.c
SRCS.file-read+= utils.c
SRCS.open+= open.c
SRCS.open+= utils.c
TEST_METADATA+= timeout="30"
TEST_METADATA+= required_user="root"

191
tests/sys/audit/open.c Normal file
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@ -0,0 +1,191 @@
/*-
* Copyright (c) 2018 Aniket Pandey
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* SUCH DAMAGE.
*
* $FreeBSD$
*/
/*
* Note: open(2) and openat(2) have 12 events each for various values of 'flag'
* Please see: contrib/openbsm/etc/audit_event#L261
*
* 270:AUE_OPENAT_R:openat(2) - read:fr
* 271:AUE_OPENAT_RC:openat(2) - read,creat:fc,fr,fa,fm
* 272:AUE_OPENAT_RT:openat(2) - read,trunc:fd,fr,fa,fm
* 273:AUE_OPENAT_RTC:openat(2) - read,creat,trunc:fc,fd,fr,fa,fm
* 274:AUE_OPENAT_W:openat(2) - write:fw
* 275:AUE_OPENAT_WC:openat(2) - write,creat:fc,fw,fa,fm
* 276:AUE_OPENAT_WT:openat(2) - write,trunc:fd,fw,fa,fm
* 277:AUE_OPENAT_WTC:openat(2) - write,creat,trunc:fc,fd,fw,fa,fm
* 278:AUE_OPENAT_RW:openat(2) - read,write:fr,fw
* 279:AUE_OPENAT_RWC:openat(2) - read,write,create:fc,fw,fr,fa,fm
* 280:AUE_OPENAT_RWT:openat(2) - read,write,trunc:fd,fw,fr,fa,fm
* 281:AUE_OPENAT_RWTC:openat(2) - read,write,creat,trunc:fc,fd,fw,fr,fa,fm
*/
#include <sys/syscall.h>
#include <atf-c.h>
#include <fcntl.h>
#include "utils.h"
static struct pollfd fds[1];
static mode_t o_mode = 0777;
static char extregex[80];
static const char *path = "fileforaudit";
static const char *errpath = "adirhasnoname/fileforaudit";
/*
* Define test-cases for success and failure modes of both open(2) and openat(2)
*/
#define OPEN_AT_TC_DEFINE(mode, regex, flag, class) \
ATF_TC_WITH_CLEANUP(open_ ## mode ## _success); \
ATF_TC_HEAD(open_ ## mode ## _success, tc) \
{ \
atf_tc_set_md_var(tc, "descr", "Tests the audit of a successful " \
"open(2) call with flags = %s", #flag); \
} \
ATF_TC_BODY(open_ ## mode ## _success, tc) \
{ \
snprintf(extregex, sizeof(extregex), \
"open.*%s.*fileforaudit.*return,success", regex); \
/* File needs to exist for successful open(2) invocation */ \
ATF_REQUIRE(open(path, O_CREAT, o_mode) != -1); \
FILE *pipefd = setup(fds, class); \
ATF_REQUIRE(syscall(SYS_open, path, flag) != -1); \
check_audit(fds, extregex, pipefd); \
} \
ATF_TC_CLEANUP(open_ ## mode ## _success, tc) \
{ \
cleanup(); \
} \
ATF_TC_WITH_CLEANUP(open_ ## mode ## _failure); \
ATF_TC_HEAD(open_ ## mode ## _failure, tc) \
{ \
atf_tc_set_md_var(tc, "descr", "Tests the audit of an unsuccessful " \
"open(2) call with flags = %s", #flag); \
} \
ATF_TC_BODY(open_ ## mode ## _failure, tc) \
{ \
snprintf(extregex, sizeof(extregex), \
"open.*%s.*fileforaudit.*return,failure", regex); \
FILE *pipefd = setup(fds, class); \
ATF_REQUIRE_EQ(-1, syscall(SYS_open, errpath, flag)); \
check_audit(fds, extregex, pipefd); \
} \
ATF_TC_CLEANUP(open_ ## mode ## _failure, tc) \
{ \
cleanup(); \
} \
ATF_TC_WITH_CLEANUP(openat_ ## mode ## _success); \
ATF_TC_HEAD(openat_ ## mode ## _success, tc) \
{ \
atf_tc_set_md_var(tc, "descr", "Tests the audit of a successful " \
"openat(2) call with flags = %s", #flag); \
} \
ATF_TC_BODY(openat_ ## mode ## _success, tc) \
{ \
snprintf(extregex, sizeof(extregex), \
"openat.*%s.*fileforaudit.*return,success", regex); \
/* File needs to exist for successful openat(2) invocation */ \
ATF_REQUIRE(open(path, O_CREAT, o_mode) != -1); \
FILE *pipefd = setup(fds, class); \
ATF_REQUIRE(openat(AT_FDCWD, path, flag) != -1); \
check_audit(fds, extregex, pipefd); \
} \
ATF_TC_CLEANUP(openat_ ## mode ## _success, tc) \
{ \
cleanup(); \
} \
ATF_TC_WITH_CLEANUP(openat_ ## mode ## _failure); \
ATF_TC_HEAD(openat_ ## mode ## _failure, tc) \
{ \
atf_tc_set_md_var(tc, "descr", "Tests the audit of an unsuccessful " \
"openat(2) call with flags = %s", #flag); \
} \
ATF_TC_BODY(openat_ ## mode ## _failure, tc) \
{ \
snprintf(extregex, sizeof(extregex), \
"openat.*%s.*fileforaudit.*return,failure", regex); \
FILE *pipefd = setup(fds, class); \
ATF_REQUIRE_EQ(-1, openat(AT_FDCWD, errpath, flag)); \
check_audit(fds, extregex, pipefd); \
} \
ATF_TC_CLEANUP(openat_ ## mode ## _failure, tc) \
{ \
cleanup(); \
}
/*
* Add both success and failure modes of open(2) and openat(2)
*/
#define OPEN_AT_TC_ADD(tp, mode) \
do { \
ATF_TP_ADD_TC(tp, open_ ## mode ## _success); \
ATF_TP_ADD_TC(tp, open_ ## mode ## _failure); \
ATF_TP_ADD_TC(tp, openat_ ## mode ## _success); \
ATF_TP_ADD_TC(tp, openat_ ## mode ## _failure); \
} while (0)
/*
* Each of the 12 OPEN_AT_TC_DEFINE statement is a group of 4 test-cases
* corresponding to separate audit events for open(2) and openat(2)
*/
OPEN_AT_TC_DEFINE(read, "read", O_RDONLY, "fr")
OPEN_AT_TC_DEFINE(read_creat, "read,creat", O_RDONLY | O_CREAT, "fr")
OPEN_AT_TC_DEFINE(read_trunc, "read,trunc", O_RDONLY | O_TRUNC, "fr")
OPEN_AT_TC_DEFINE(read_creat_trunc, "read,creat,trunc", O_RDONLY | O_CREAT
| O_TRUNC, "fr")
OPEN_AT_TC_DEFINE(write, "write", O_WRONLY, "fw")
OPEN_AT_TC_DEFINE(write_creat, "write,creat", O_WRONLY | O_CREAT, "fw")
OPEN_AT_TC_DEFINE(write_trunc, "write,trunc", O_WRONLY | O_TRUNC, "fw")
OPEN_AT_TC_DEFINE(write_creat_trunc, "write,creat,trunc", O_WRONLY | O_CREAT
| O_TRUNC, "fw")
OPEN_AT_TC_DEFINE(read_write, "read,write", O_RDWR, "fr")
OPEN_AT_TC_DEFINE(read_write_creat, "read,write,creat", O_RDWR | O_CREAT, "fw")
OPEN_AT_TC_DEFINE(read_write_trunc, "read,write,trunc", O_RDWR | O_TRUNC, "fr")
OPEN_AT_TC_DEFINE(read_write_creat_trunc, "read,write,creat,trunc", O_RDWR |
O_CREAT | O_TRUNC, "fw")
ATF_TP_ADD_TCS(tp)
{
OPEN_AT_TC_ADD(tp, read);
OPEN_AT_TC_ADD(tp, read_creat);
OPEN_AT_TC_ADD(tp, read_trunc);
OPEN_AT_TC_ADD(tp, read_creat_trunc);
OPEN_AT_TC_ADD(tp, write);
OPEN_AT_TC_ADD(tp, write_creat);
OPEN_AT_TC_ADD(tp, write_trunc);
OPEN_AT_TC_ADD(tp, write_creat_trunc);
OPEN_AT_TC_ADD(tp, read_write);
OPEN_AT_TC_ADD(tp, read_write_creat);
OPEN_AT_TC_ADD(tp, read_write_trunc);
OPEN_AT_TC_ADD(tp, read_write_creat_trunc);
return (atf_no_error());
}