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-rw-r--r--plugins/sudoers/bsm_audit.c283
1 files changed, 283 insertions, 0 deletions
diff --git a/plugins/sudoers/bsm_audit.c b/plugins/sudoers/bsm_audit.c
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+++ b/plugins/sudoers/bsm_audit.c
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+/*
+ * SPDX-License-Identifier: ISC
+ *
+ * Copyright (c) 2009-2015 Todd C. Miller <Todd.Miller@sudo.ws>
+ * Copyright (c) 2009 Christian S.J. Peron
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/*
+ * This is an open source non-commercial project. Dear PVS-Studio, please check it.
+ * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
+ */
+
+#include <config.h>
+
+#ifdef HAVE_BSM_AUDIT
+
+#include <sys/types.h> /* for pid_t */
+
+#include <bsm/audit.h>
+#include <bsm/libbsm.h>
+#include <bsm/audit_uevents.h>
+
+#include <stdio.h>
+#include <stdarg.h>
+#include <errno.h>
+#include <unistd.h>
+
+#include "sudoers.h"
+#include "bsm_audit.h"
+
+/*
+ * Solaris auditon() returns EINVAL if BSM audit not configured.
+ * OpenBSM returns ENOSYS for unimplemented options.
+ */
+#ifdef __sun
+# define AUDIT_NOT_CONFIGURED EINVAL
+#else
+# define AUDIT_NOT_CONFIGURED ENOSYS
+#endif
+
+#ifdef __FreeBSD__
+# define BSM_AUDIT_COMPAT
+#endif
+
+static au_event_t sudo_audit_event = AUE_sudo;
+
+static int
+audit_sudo_selected(int sorf)
+{
+ auditinfo_addr_t ainfo_addr;
+ struct au_mask *mask;
+ int rc;
+ debug_decl(audit_sudo_selected, SUDOERS_DEBUG_AUDIT);
+
+ if (getaudit_addr(&ainfo_addr, sizeof(ainfo_addr)) < 0) {
+#ifdef BSM_AUDIT_COMPAT
+ if (errno == ENOSYS) {
+ auditinfo_t ainfo;
+
+ /* Fall back to older BSM API. */
+ if (getaudit(&ainfo) < 0) {
+ sudo_warn("getaudit");
+ debug_return_int(-1);
+ }
+ mask = &ainfo.ai_mask;
+ } else
+#endif /* BSM_AUDIT_COMPAT */
+ {
+ sudo_warn("getaudit_addr");
+ debug_return_int(-1);
+ }
+ } else {
+ mask = &ainfo_addr.ai_mask;
+ }
+ rc = au_preselect(sudo_audit_event, mask, sorf, AU_PRS_REREAD);
+ if (rc == -1) {
+#if defined(__APPLE__) && defined(AUE_DARWIN_sudo)
+ /*
+ * Mac OS X 10.10 au_preselect() only accepts AUE_DARWIN_sudo.
+ */
+ sudo_audit_event = AUE_DARWIN_sudo;
+ rc = au_preselect(sudo_audit_event, mask, sorf, AU_PRS_REREAD);
+ if (rc == -1)
+#endif
+
+ sudo_warn("au_preselect");
+ }
+ debug_return_int(rc);
+}
+
+/*
+ * Returns 0 on success or -1 on error.
+ */
+int
+bsm_audit_success(char *const exec_args[])
+{
+ auditinfo_addr_t ainfo_addr;
+ token_t *tok;
+ au_id_t auid;
+ long au_cond;
+ int aufd, selected;
+ pid_t pid;
+ debug_decl(bsm_audit_success, SUDOERS_DEBUG_AUDIT);
+
+ /*
+ * If we are not auditing, don't cut an audit record; just return.
+ */
+ if (auditon(A_GETCOND, (caddr_t)&au_cond, sizeof(long)) < 0) {
+ if (errno == AUDIT_NOT_CONFIGURED)
+ debug_return_int(0);
+ sudo_warn("%s", U_("Could not determine audit condition"));
+ debug_return_int(-1);
+ }
+ if (au_cond == AUC_NOAUDIT)
+ debug_return_int(0);
+ /*
+ * Check to see if the preselection masks are interested in seeing
+ * this event.
+ */
+ selected = audit_sudo_selected(AU_PRS_SUCCESS);
+ if (selected != 1)
+ debug_return_int(!selected ? 0 : -1);
+ if (getauid(&auid) < 0) {
+ sudo_warn("getauid");
+ debug_return_int(-1);
+ }
+ if ((aufd = au_open()) == -1) {
+ sudo_warn("au_open");
+ debug_return_int(-1);
+ }
+ pid = getpid();
+ if (getaudit_addr(&ainfo_addr, sizeof(ainfo_addr)) == 0) {
+ tok = au_to_subject_ex(auid, geteuid(), getegid(), getuid(),
+ getuid(), pid, pid, &ainfo_addr.ai_termid);
+#ifdef BSM_AUDIT_COMPAT
+ } else if (errno == ENOSYS) {
+ auditinfo_t ainfo;
+
+ /*
+ * NB: We should probably watch out for ERANGE here.
+ */
+ if (getaudit(&ainfo) < 0) {
+ sudo_warn("getaudit");
+ debug_return_int(-1);
+ }
+ tok = au_to_subject(auid, geteuid(), getegid(), getuid(),
+ getuid(), pid, pid, &ainfo.ai_termid);
+#endif /* BSM_AUDIT_COMPAT */
+ } else {
+ sudo_warn("getaudit_addr");
+ debug_return_int(-1);
+ }
+ if (tok == NULL) {
+ sudo_warn("au_to_subject");
+ debug_return_int(-1);
+ }
+ au_write(aufd, tok);
+ tok = au_to_exec_args((char **)exec_args);
+ if (tok == NULL) {
+ sudo_warn("au_to_exec_args");
+ debug_return_int(-1);
+ }
+ au_write(aufd, tok);
+ tok = au_to_return32(0, 0);
+ if (tok == NULL) {
+ sudo_warn("au_to_return32");
+ debug_return_int(-1);
+ }
+ au_write(aufd, tok);
+#ifdef HAVE_AU_CLOSE_SOLARIS11
+ if (au_close(aufd, 1, sudo_audit_event, 0) == -1)
+#else
+ if (au_close(aufd, 1, sudo_audit_event) == -1)
+#endif
+ {
+ sudo_warn("%s", U_("unable to commit audit record"));
+ debug_return_int(-1);
+ }
+ debug_return_int(0);
+}
+
+/*
+ * Returns 0 on success or -1 on error.
+ */
+int
+bsm_audit_failure(char *const exec_args[], const char *errmsg)
+{
+ auditinfo_addr_t ainfo_addr;
+ token_t *tok;
+ long au_cond;
+ au_id_t auid;
+ pid_t pid;
+ int aufd;
+ debug_decl(bsm_audit_failure, SUDOERS_DEBUG_AUDIT);
+
+ /*
+ * If we are not auditing, don't cut an audit record; just return.
+ */
+ if (auditon(A_GETCOND, (caddr_t)&au_cond, sizeof(long)) < 0) {
+ if (errno == AUDIT_NOT_CONFIGURED)
+ debug_return_int(0);
+ sudo_warn("%s", U_("Could not determine audit condition"));
+ debug_return_int(-1);
+ }
+ if (au_cond == AUC_NOAUDIT)
+ debug_return_int(0);
+ if (!audit_sudo_selected(AU_PRS_FAILURE))
+ debug_return_int(0);
+ if (getauid(&auid) < 0) {
+ sudo_warn("getauid");
+ debug_return_int(-1);
+ }
+ if ((aufd = au_open()) == -1) {
+ sudo_warn("au_open");
+ debug_return_int(-1);
+ }
+ pid = getpid();
+ if (getaudit_addr(&ainfo_addr, sizeof(ainfo_addr)) == 0) {
+ tok = au_to_subject_ex(auid, geteuid(), getegid(), getuid(),
+ getuid(), pid, pid, &ainfo_addr.ai_termid);
+#ifdef BSM_AUDIT_COMPAT
+ } else if (errno == ENOSYS) {
+ auditinfo_t ainfo;
+
+ if (getaudit(&ainfo) < 0) {
+ sudo_warn("getaudit");
+ debug_return_int(-1);
+ }
+ tok = au_to_subject(auid, geteuid(), getegid(), getuid(),
+ getuid(), pid, pid, &ainfo.ai_termid);
+#endif /* BSM_AUDIT_COMPAT */
+ } else {
+ sudo_warn("getaudit_addr");
+ debug_return_int(-1);
+ }
+ if (tok == NULL) {
+ sudo_warn("au_to_subject");
+ debug_return_int(-1);
+ }
+ au_write(aufd, tok);
+ tok = au_to_exec_args((char **)exec_args);
+ if (tok == NULL) {
+ sudo_warn("au_to_exec_args");
+ debug_return_int(-1);
+ }
+ au_write(aufd, tok);
+ tok = au_to_text((char *)errmsg);
+ if (tok == NULL) {
+ sudo_warn("au_to_text");
+ debug_return_int(-1);
+ }
+ au_write(aufd, tok);
+ tok = au_to_return32(EPERM, 1);
+ if (tok == NULL) {
+ sudo_warn("au_to_return32");
+ debug_return_int(-1);
+ }
+ au_write(aufd, tok);
+#ifdef HAVE_AU_CLOSE_SOLARIS11
+ if (au_close(aufd, 1, sudo_audit_event, PAD_FAILURE) == -1)
+#else
+ if (au_close(aufd, 1, sudo_audit_event) == -1)
+#endif
+ {
+ sudo_warn("%s", U_("unable to commit audit record"));
+ debug_return_int(-1);
+ }
+ debug_return_int(0);
+}
+
+#endif /* HAVE_BSM_AUDIT */