2 * Copyright 2018 Aniket Pandey
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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28 #include <sys/types.h>
29 #include <sys/extattr.h>
30 #include <sys/ioctl.h>
32 #include <bsm/libbsm.h>
33 #include <bsm/auditd_lib.h>
34 #include <security/audit/audit_ioctl.h>
47 * Checks the presence of "auditregex" in auditpipe(4) after the
48 * corresponding system call has been triggered.
51 get_records(const char *auditregex, FILE *pipestream)
58 int reclen, bytes = 0;
62 * Open a stream on 'membuff' (address to memory buffer) for storing
63 * the audit records in the default mode.'reclen' is the length of the
64 * available records from auditpipe which is passed to the functions
65 * au_fetch_tok(3) and au_print_flags_tok(3) for further use.
67 ATF_REQUIRE((memstream = fmemopen(membuff, size, "w")) != NULL);
68 ATF_REQUIRE((reclen = au_read_rec(pipestream, &buff)) != -1);
71 * Iterate through each BSM token, extracting the bits that are
72 * required to start processing the token sequences.
74 while (bytes < reclen) {
75 if (au_fetch_tok(&token, buff + bytes, reclen - bytes) == -1) {
76 perror("au_read_rec");
77 atf_tc_fail("Incomplete Audit Record");
80 /* Print the tokens as they are obtained, in the default form */
81 au_print_flags_tok(memstream, &token, del, AU_OFLAG_NONE);
82 fputc(',', memstream);
87 ATF_REQUIRE_EQ(0, fclose(memstream));
88 return (atf_utils_grep_string("%s", membuff, auditregex));
92 * Override the system-wide audit mask settings in /etc/security/audit_control
93 * and set the auditpipe's maximum allowed queue length limit
96 set_preselect_mode(int filedesc, au_mask_t *fmask)
99 int fmode = AUDITPIPE_PRESELECT_MODE_LOCAL;
101 /* Set local preselection mode for auditing */
102 if (ioctl(filedesc, AUDITPIPE_SET_PRESELECT_MODE, &fmode) < 0)
103 atf_tc_fail("Preselection mode: %s", strerror(errno));
105 /* Set local preselection flag corresponding to the audit_event */
106 if (ioctl(filedesc, AUDITPIPE_SET_PRESELECT_FLAGS, fmask) < 0)
107 atf_tc_fail("Preselection flag: %s", strerror(errno));
109 /* Set local preselection flag for non-attributable audit_events */
110 if (ioctl(filedesc, AUDITPIPE_SET_PRESELECT_NAFLAGS, fmask) < 0)
111 atf_tc_fail("Preselection naflag: %s", strerror(errno));
113 /* Query the maximum possible queue length limit for auditpipe */
114 if (ioctl(filedesc, AUDITPIPE_GET_QLIMIT_MAX, &qlimit_max) < 0)
115 atf_tc_fail("Query max-limit: %s", strerror(errno));
117 /* Set the queue length limit as obtained from previous step */
118 if (ioctl(filedesc, AUDITPIPE_SET_QLIMIT, &qlimit_max) < 0)
119 atf_tc_fail("Set max-qlimit: %s", strerror(errno));
121 /* This removes any outstanding record on the auditpipe */
122 if (ioctl(filedesc, AUDITPIPE_FLUSH) < 0)
123 atf_tc_fail("Auditpipe flush: %s", strerror(errno));
127 * Get the corresponding audit_mask for class-name "name" then set the
128 * success and failure bits for fmask to be used as the ioctl argument
131 get_audit_mask(const char *name)
134 au_class_ent_t *class;
136 ATF_REQUIRE((class = getauclassnam(name)) != NULL);
137 fmask.am_success = class->ac_class;
138 fmask.am_failure = class->ac_class;
143 * Loop until the auditpipe returns something, check if it is what
144 * we want, else repeat the procedure until ppoll(2) times out.
147 check_auditpipe(struct pollfd fd[], const char *auditregex, FILE *pipestream)
149 struct timespec currtime, endtime, timeout;
151 /* Set the expire time for poll(2) while waiting for syscall audit */
152 ATF_REQUIRE_EQ(0, clock_gettime(CLOCK_MONOTONIC, &endtime));
153 /* Set limit to 30 seconds total and ~10s without an event. */
154 endtime.tv_sec += 30;
157 /* Update the time left for auditpipe to return any event */
158 ATF_REQUIRE_EQ(0, clock_gettime(CLOCK_MONOTONIC, &currtime));
159 timespecsub(&endtime, &currtime, &timeout);
160 timeout.tv_sec = MIN(timeout.tv_sec, 9);
161 if (timeout.tv_sec < 0) {
162 atf_tc_fail("%s not found in auditpipe within the "
163 "time limit", auditregex);
166 switch (ppoll(fd, 1, &timeout, NULL)) {
167 /* ppoll(2) returns, check if it's what we want */
169 if (fd[0].revents & POLLIN) {
170 if (get_records(auditregex, pipestream))
173 atf_tc_fail("Auditpipe returned an "
174 "unknown event %#x", fd[0].revents);
178 /* poll(2) timed out */
180 atf_tc_fail("%s not found in auditpipe within the "
181 "time limit", auditregex);
184 /* poll(2) standard error */
186 atf_tc_fail("Poll: %s", strerror(errno));
190 atf_tc_fail("Poll returned too many file descriptors");
196 * Wrapper functions around static "check_auditpipe"
199 check_audit_startup(struct pollfd fd[], const char *auditrgx, FILE *pipestream){
200 check_auditpipe(fd, auditrgx, pipestream);
204 check_audit(struct pollfd fd[], const char *auditrgx, FILE *pipestream) {
205 check_auditpipe(fd, auditrgx, pipestream);
207 /* Teardown: /dev/auditpipe's instance opened for this test-suite */
208 ATF_REQUIRE_EQ(0, fclose(pipestream));
212 skip_if_extattr_not_supported(const char *path)
217 * Some file systems (e.g. tmpfs) do not support extattr, so we need
218 * skip tests that use extattrs. To detect this we can check whether
219 * the extattr_list_file returns EOPNOTSUPP.
221 result = extattr_list_file(path, EXTATTR_NAMESPACE_USER, NULL, 0);
222 if (result == -1 && errno == EOPNOTSUPP) {
223 atf_tc_skip("File system does not support extattrs.");
228 is_auditd_running(void)
234 * AUDIT_TRIGGER_INITIALIZE is a no-op message on FreeBSD and can
235 * therefore be used to check whether auditd has already been started.
236 * This is significantly cheaper than running `service auditd onestatus`
237 * for each test case. It is also slightly less racy since it will only
238 * return true once auditd() has opened the trigger file rather than
239 * just when the pidfile has been created.
241 trigger = AUDIT_TRIGGER_INITIALIZE;
242 err = auditon(A_SENDTRIGGER, &trigger, sizeof(trigger));
244 fprintf(stderr, "auditd(8) is running.\n");
248 * A_SENDTRIGGER returns ENODEV if auditd isn't listening,
249 * all other error codes indicate a fatal error.
251 ATF_REQUIRE_MSG(errno == ENODEV,
252 "Unexpected error from auditon(2): %s", strerror(errno));
259 setup(struct pollfd fd[], const char *name)
261 au_mask_t fmask, nomask;
263 fmask = get_audit_mask(name);
264 nomask = get_audit_mask("no");
266 ATF_REQUIRE((fd[0].fd = open("/dev/auditpipe", O_RDONLY)) != -1);
267 ATF_REQUIRE((pipestream = fdopen(fd[0].fd, "r")) != NULL);
268 fd[0].events = POLLIN;
271 * Disable stream buffering for read operations from /dev/auditpipe.
272 * Otherwise it is possible that fread(3), called via au_read_rec(3),
273 * can store buffered data in user-space unbeknown to ppoll(2), which
274 * as a result, reports that /dev/auditpipe is empty.
276 ATF_REQUIRE_EQ(0, setvbuf(pipestream, NULL, _IONBF, 0));
278 /* Set local preselection audit_class as "no" for audit startup */
279 set_preselect_mode(fd[0].fd, &nomask);
280 if (!is_auditd_running()) {
281 fprintf(stderr, "Running audit_quick_start() for testing... ");
283 * Previously, this test started auditd using
284 * `service auditd onestart`. However, there is a race condition
285 * there since service can return before auditd(8) has
286 * fully started (once the daemon parent process has forked)
287 * and this can cause check_audit_startup() to fail sometimes.
289 * In the CheriBSD CI this caused the first test executed by
290 * kyua (administrative:acct_failure) to fail every time, but
291 * subsequent ones would almost always succeed.
293 * To avoid this problem (and as a nice side-effect this speeds
294 * up the test quite a bit), we register this process as a
295 * "fake" auditd(8) using the audit_quick_start() function from
298 atf_utils_create_file("started_fake_auditd", "yes\n");
299 ATF_REQUIRE(atf_utils_file_exists("started_fake_auditd"));
300 ATF_REQUIRE_EQ_MSG(0, audit_quick_start(),
301 "Failed to start fake auditd: %m");
302 fprintf(stderr, "done.\n");
303 /* audit_quick_start() should log an audit start event. */
304 check_audit_startup(fd, "audit startup", pipestream);
306 * If we exit cleanly shutdown audit_quick_start(), if not
307 * cleanup() will take care of it.
308 * This is not required, but makes it easier to run individual
309 * tests outside of kyua.
314 /* Set local preselection parameters specific to "name" audit_class */
315 set_preselect_mode(fd[0].fd, &fmask);
322 if (atf_utils_file_exists("started_fake_auditd")) {
323 fprintf(stderr, "Running audit_quick_stop()... ");
324 if (audit_quick_stop() != 0) {
325 fprintf(stderr, "Failed to stop fake auditd: %m\n");
328 fprintf(stderr, "done.\n");
329 unlink("started_fake_auditd");