Adding upstream version 1.9.13p3.upstream/1.9.13p3upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1288 insertions, 0 deletions

diff --git a/plugins/sudoers/defaults.c b/plugins/sudoers/defaults.c
new file mode 100644
index 0000000..e90be1f
--- /dev/null
+++ b/plugins/sudoers/defaults.c
@@ -0,0 +1,1288 @@
+/*
+ * SPDX-License-Identifier: ISC
+ *
+ * Copyright (c) 1999-2005, 2007-2022
+ *	Todd C. Miller <Todd.Miller@sudo.ws>
+ *
+ * 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.
+ *
+ * Sponsored in part by the Defense Advanced Research Projects
+ * Agency (DARPA) and Air Force Research Laboratory, Air Force
+ * Materiel Command, USAF, under agreement number F39502-99-1-0512.
+ */
+
+/*
+ * 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>
+
+#include <sys/stat.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <ctype.h>
+#include <errno.h>
+#include <limits.h>
+#include <syslog.h>
+
+#include "sudoers.h"
+#include "sudo_eventlog.h"
+#include "sudo_iolog.h"
+#include <gram.h>
+
+static struct early_default early_defaults[] = {
+    { I_IGNORE_UNKNOWN_DEFAULTS },
+#ifdef FQDN
+    { I_FQDN, true },
+#else
+    { I_FQDN },
+#endif
+    { I_MATCH_GROUP_BY_GID },
+    { I_GROUP_PLUGIN },
+    { I_RUNAS_DEFAULT },
+    { I_SUDOERS_LOCALE },
+    { -1 }
+};
+
+/*
+ * Local prototypes.
+ */
+static bool store_int(const char *str, struct sudo_defs_types *def);
+static bool store_list(const char *str, struct sudo_defs_types *def, int op);
+static bool store_mode(const char *str, struct sudo_defs_types *def);
+static int  store_str(const char *str, struct sudo_defs_types *def);
+static bool store_syslogfac(const char *str, struct sudo_defs_types *def);
+static bool store_syslogpri(const char *str, struct sudo_defs_types *def);
+static bool store_timeout(const char *str, struct sudo_defs_types *def);
+static bool store_tuple(const char *str, struct sudo_defs_types *def);
+static bool store_uint(const char *str, struct sudo_defs_types *def);
+static bool store_timespec(const char *str, struct sudo_defs_types *def);
+static bool store_rlimit(const char *str, struct sudo_defs_types *def);
+static bool list_op(const char *str, size_t, struct list_members *list, enum list_ops op);
+static bool valid_path(struct sudo_defs_types *def, const char *val, const char *file, int line, int column, bool quiet);
+static bool defaults_warnx(const char *file, int line, int column, bool quiet, const char *fmt, ...) sudo_printflike(5, 6);
+
+/*
+ * Table describing compile-time and run-time options.
+ */
+#include <def_data.c>
+
+/*
+ * Print version and configure info.
+ */
+void
+dump_defaults(void)
+{
+    struct sudo_defs_types *cur;
+    struct list_member *item;
+    struct def_values *def;
+    const char *desc;
+    debug_decl(dump_defaults, SUDOERS_DEBUG_DEFAULTS);
+
+    for (cur = sudo_defs_table; cur->name; cur++) {
+	if (cur->desc) {
+	    desc = _(cur->desc);
+	    switch (cur->type & T_MASK) {
+		case T_FLAG:
+		    if (cur->sd_un.flag)
+			sudo_printf(SUDO_CONV_INFO_MSG, "%s\n", desc);
+		    break;
+		case T_STR:
+		case T_RLIMIT:
+		    if (cur->sd_un.str) {
+			sudo_printf(SUDO_CONV_INFO_MSG, desc, cur->sd_un.str);
+			sudo_printf(SUDO_CONV_INFO_MSG, "\n");
+		    }
+		    break;
+		case T_LOGFAC:
+		    if (cur->sd_un.ival) {
+			sudo_printf(SUDO_CONV_INFO_MSG, desc,
+			    sudo_logfac2str(cur->sd_un.ival));
+			sudo_printf(SUDO_CONV_INFO_MSG, "\n");
+		    }
+		    break;
+		case T_LOGPRI:
+		    if (cur->sd_un.ival) {
+			sudo_printf(SUDO_CONV_INFO_MSG, desc,
+			    sudo_logpri2str(cur->sd_un.ival));
+			sudo_printf(SUDO_CONV_INFO_MSG, "\n");
+		    }
+		    break;
+		case T_INT:
+		    sudo_printf(SUDO_CONV_INFO_MSG, desc, cur->sd_un.ival);
+		    sudo_printf(SUDO_CONV_INFO_MSG, "\n");
+		    break;
+		case T_UINT:
+		    sudo_printf(SUDO_CONV_INFO_MSG, desc, cur->sd_un.uival);
+		    sudo_printf(SUDO_CONV_INFO_MSG, "\n");
+		    break;
+		case T_TIMESPEC: {
+		    /* display timespec in minutes as a double */
+		    double d = cur->sd_un.tspec.tv_sec +
+			(cur->sd_un.tspec.tv_nsec / 1000000000.0);
+		    sudo_printf(SUDO_CONV_INFO_MSG, desc, d / 60.0);
+		    sudo_printf(SUDO_CONV_INFO_MSG, "\n");
+		    break;
+		}
+		case T_MODE:
+		    sudo_printf(SUDO_CONV_INFO_MSG, desc, cur->sd_un.mode);
+		    sudo_printf(SUDO_CONV_INFO_MSG, "\n");
+		    break;
+		case T_LIST:
+		    if (!SLIST_EMPTY(&cur->sd_un.list)) {
+			sudo_printf(SUDO_CONV_INFO_MSG, "%s\n", desc);
+			SLIST_FOREACH(item, &cur->sd_un.list, entries) {
+			    sudo_printf(SUDO_CONV_INFO_MSG,
+				"\t%s\n", item->value);
+			}
+		    }
+		    break;
+		case T_TIMEOUT:
+		    if (cur->sd_un.ival) {
+			sudo_printf(SUDO_CONV_INFO_MSG, desc,
+			    cur->sd_un.ival);
+			sudo_printf(SUDO_CONV_INFO_MSG, "\n");
+		    }
+		    break;
+		case T_TUPLE:
+		    for (def = cur->values; def->sval; def++) {
+			if (cur->sd_un.tuple == def->nval) {
+			    sudo_printf(SUDO_CONV_INFO_MSG, desc, def->sval);
+			    break;
+			}
+		    }
+		    sudo_printf(SUDO_CONV_INFO_MSG, "\n");
+		    break;
+	    }
+	}
+    }
+    debug_return;
+}
+
+/*
+ * Find the index of the specified Defaults name in sudo_defs_table[]
+ * On success, returns the matching index or -1 on failure.
+ */
+static int
+find_default(const char *name, const char *file, int line, int column, bool quiet)
+{
+    int i;
+    debug_decl(find_default, SUDOERS_DEBUG_DEFAULTS);
+
+    for (i = 0; sudo_defs_table[i].name != NULL; i++) {
+	if (strcmp(name, sudo_defs_table[i].name) == 0)
+	    debug_return_int(i);
+    }
+    if (!def_ignore_unknown_defaults) {
+	defaults_warnx(file, line, column, quiet,
+	    N_("unknown defaults entry \"%s\""), name);
+    }
+    debug_return_int(-1);
+}
+
+/*
+ * Parse a defaults entry, storing the parsed entry in sd_un.
+ * Returns true on success or false on failure.
+ */
+static bool
+parse_default_entry(struct sudo_defs_types *def, const char *val, int op,
+    const char *file, int line, int column, bool quiet)
+{
+    int rc;
+    debug_decl(parse_default_entry, SUDOERS_DEBUG_DEFAULTS);
+
+    if (file == NULL)
+	file = "front-end";
+
+    sudo_debug_printf(SUDO_DEBUG_INFO, "%s: %s:%d:%d: %s=%s op=%d",
+	__func__, file, line, column, def->name, val ? val : "", op);
+
+    /*
+     * If no value specified, the boolean flag must be set for non-flags.
+     * Only flags and tuples support boolean "true".
+     */
+    if (val == NULL) {
+	switch (def->type & T_MASK) {
+	case T_FLAG:
+	    break;
+	case T_TUPLE:
+	    if (ISSET(def->type, T_BOOL))
+		break;
+	    FALLTHROUGH;
+	case T_LOGFAC:
+	    if (op == true) {
+		/* Use default syslog facility if none specified. */
+		val = LOGFAC;
+	    }
+	    break;
+	default:
+	    if (!ISSET(def->type, T_BOOL) || op != false) {
+		defaults_warnx(file, line, column, quiet,
+		    N_("no value specified for \"%s\""), def->name);
+		debug_return_bool(false);
+	    }
+	}
+    }
+
+    /* Only lists support append/remove. */
+    if ((op == '+' || op == '-') && (def->type & T_MASK) != T_LIST) {
+	defaults_warnx(file, line, column, quiet,
+	    N_("invalid operator \"%c=\" for \"%s\""), op, def->name);
+	debug_return_bool(false);
+    }
+
+    switch (def->type & T_MASK) {
+	case T_LOGFAC:
+	    rc = store_syslogfac(val, def);
+	    break;
+	case T_LOGPRI:
+	    rc = store_syslogpri(val, def);
+	    break;
+	case T_STR:
+	    if (val != NULL && ISSET(def->type, T_PATH|T_CHPATH)) {
+		if (!valid_path(def, val, file, line, column, quiet)) {
+		    rc = -1;
+		    break;
+		}
+	    }
+	    rc = store_str(val, def);
+	    break;
+	case T_INT:
+	    rc = store_int(val, def);
+	    break;
+	case T_UINT:
+	    rc = store_uint(val, def);
+	    break;
+	case T_MODE:
+	    rc = store_mode(val, def);
+	    break;
+	case T_FLAG:
+	    if (val != NULL) {
+		defaults_warnx(file, line, column, quiet,
+		    N_("option \"%s\" does not take a value"), def->name);
+		rc = -1;
+		break;
+	    }
+	    def->sd_un.flag = op;
+	    rc = true;
+	    break;
+	case T_LIST:
+	    rc = store_list(val, def, op);
+	    break;
+	case T_TIMEOUT:
+	    rc = store_timeout(val, def);
+	    break;
+	case T_TUPLE:
+	    rc = store_tuple(val, def);
+	    break;
+	case T_TIMESPEC:
+	    rc = store_timespec(val, def);
+	    break;
+	case T_RLIMIT:
+	    rc = store_rlimit(val, def);
+	    break;
+	default:
+	    defaults_warnx(file, line, column, quiet,
+		N_("invalid Defaults type 0x%x for option \"%s\""),
+		def->type, def->name);
+	    rc = -1;
+	    break;
+    }
+    if (rc == false) {
+	defaults_warnx(file, line, column, quiet,
+	    N_("value \"%s\" is invalid for option \"%s\""), val, def->name);
+    }
+
+    debug_return_bool(rc == true);
+}
+
+static struct early_default *
+is_early_default(const char *name)
+{
+    struct early_default *early;
+    debug_decl(is_early_default, SUDOERS_DEBUG_DEFAULTS);
+
+    for (early = early_defaults; early->idx != -1; early++) {
+	if (strcmp(name, sudo_defs_table[early->idx].name) == 0)
+	    debug_return_ptr(early);
+    }
+    debug_return_ptr(NULL);
+}
+
+static bool
+run_callback(const char *file, int line, int column,
+    struct sudo_defs_types *def, int op)
+{
+    debug_decl(run_callback, SUDOERS_DEBUG_DEFAULTS);
+
+    if (def->callback == NULL)
+	debug_return_bool(true);
+    debug_return_bool(def->callback(file, line, column, &def->sd_un, op));
+}
+
+/*
+ * Sets/clears an entry in the defaults structure.
+ * Runs the callback if present on success.
+ */
+bool
+set_default(const char *var, const char *val, int op, const char *file,
+    int line, int column, bool quiet)
+{
+    int idx;
+    debug_decl(set_default, SUDOERS_DEBUG_DEFAULTS);
+
+    sudo_debug_printf(SUDO_DEBUG_INFO|SUDO_DEBUG_LINENO,
+	"%s: setting Defaults %s -> %s", __func__, var, val ? val : "false");
+
+    idx = find_default(var, file, line, column, quiet);
+    if (idx != -1) {
+	/* Set parsed value in sudo_defs_table and run callback (if any). */
+	struct sudo_defs_types *def = &sudo_defs_table[idx];
+	if (parse_default_entry(def, val, op, file, line, column, quiet))
+	    debug_return_bool(run_callback(file, line, column, def, op));
+    }
+    debug_return_bool(false);
+}
+
+/*
+ * Like set_default() but stores the matching default value
+ * and does not run callbacks.
+ */
+static bool
+set_early_default(const char *var, const char *val, int op, const char *file,
+    int line, int column, bool quiet, struct early_default *early)
+{
+    int idx;
+    debug_decl(set_early_default, SUDOERS_DEBUG_DEFAULTS);
+
+    idx = find_default(var, file, line, column, quiet);
+    if (idx != -1) {
+	/* Set parsed value in sudo_defs_table but defer callback (if any). */
+	struct sudo_defs_types *def = &sudo_defs_table[idx];
+	if (parse_default_entry(def, val, op, file, line, column, quiet)) {
+	    if (early->file != NULL)
+		sudo_rcstr_delref(early->file);
+	    early->file = sudo_rcstr_addref(file);
+	    early->line = line;
+	    early->column = column;
+	    early->run_callback = true;
+	    debug_return_bool(true);
+	}
+    }
+    debug_return_bool(false);
+}
+
+/*
+ * Run callbacks for early defaults.
+ */
+static bool
+run_early_defaults(void)
+{
+    struct early_default *early;
+    bool ret = true;
+    debug_decl(run_early_defaults, SUDOERS_DEBUG_DEFAULTS);
+
+    for (early = early_defaults; early->idx != -1; early++) {
+	if (early->run_callback) {
+	    if (!run_callback(early->file, early->line, early->column,
+		    &sudo_defs_table[early->idx], true))
+		ret = false;
+	    early->run_callback = false;
+	}
+    }
+    debug_return_bool(ret);
+}
+
+static void
+free_defs_val(int type, union sudo_defs_val *sd_un)
+{
+    switch (type & T_MASK) {
+	case T_STR:
+	case T_RLIMIT:
+	    free(sd_un->str);
+	    break;
+	case T_LIST:
+	    (void)list_op(NULL, 0, &sd_un->list, freeall);
+	    break;
+    }
+    memset(sd_un, 0, sizeof(*sd_un));
+}
+
+static bool
+init_passprompt_regex(void)
+{
+    struct list_member *lm;
+    debug_decl(init_passprompt_regex, SUDOERS_DEBUG_DEFAULTS);
+
+    /* Add initial defaults setting. */
+    lm = calloc(1, sizeof(struct list_member));
+    if (lm == NULL || (lm->value = strdup(PASSPROMPT_REGEX)) == NULL) {
+	free(lm);
+	sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
+	debug_return_bool(false);
+    }
+    SLIST_INSERT_HEAD(&def_passprompt_regex, lm, entries);
+
+    debug_return_bool(true);
+}
+
+/*
+ * Set default options to compiled-in values.
+ * Any of these may be overridden at runtime by a "Defaults" file.
+ */
+bool
+init_defaults(void)
+{
+    static bool firsttime = true;
+    struct sudo_defs_types *def;
+    debug_decl(init_defaults, SUDOERS_DEBUG_DEFAULTS);
+
+    /* Clear any old settings. */
+    if (!firsttime) {
+	for (def = sudo_defs_table; def->name != NULL; def++)
+	    free_defs_val(def->type, &def->sd_un);
+    }
+
+    /* First initialize the flags. */
+#ifdef LONG_OTP_PROMPT
+    def_long_otp_prompt = true;
+#endif
+#ifdef IGNORE_DOT_PATH
+    def_ignore_dot = true;
+#endif
+#ifdef ALWAYS_SEND_MAIL
+    def_mail_always = true;
+#endif
+#ifdef SEND_MAIL_WHEN_NO_USER
+    def_mail_no_user = true;
+#endif
+#ifdef SEND_MAIL_WHEN_NO_HOST
+    def_mail_no_host = true;
+#endif
+#ifdef SEND_MAIL_WHEN_NOT_OK
+    def_mail_no_perms = true;
+#endif
+#ifndef NO_LECTURE
+    def_lecture = once;
+#endif
+#ifndef NO_AUTHENTICATION
+    def_authenticate = true;
+#endif
+#ifndef NO_ROOT_SUDO
+    def_root_sudo = true;
+#endif
+#ifdef HOST_IN_LOG
+    def_log_host = true;
+#endif
+#ifdef SHELL_IF_NO_ARGS
+    def_shell_noargs = true;
+#endif
+#ifdef SHELL_SETS_HOME
+    def_set_home = true;
+#endif
+#ifndef DONT_LEAK_PATH_INFO
+    def_path_info = true;
+#endif
+#ifdef USE_INSULTS
+    def_insults = true;
+#endif
+#ifdef FQDN
+    def_fqdn = true;
+#endif
+#ifdef ENV_EDITOR
+    def_env_editor = true;
+#endif
+#ifdef UMASK_OVERRIDE
+    def_umask_override = true;
+#endif
+    def_timestamp_type = TIMESTAMP_TYPE;
+    if ((def_iolog_file = strdup("%{seq}")) == NULL)
+	goto oom;
+    if ((def_iolog_dir = strdup(_PATH_SUDO_IO_LOGDIR)) == NULL)
+	goto oom;
+    if ((def_sudoers_locale = strdup("C")) == NULL)
+	goto oom;
+    def_env_reset = ENV_RESET;
+    def_set_logname = true;
+    def_closefrom = STDERR_FILENO + 1;
+    def_pam_ruser = true;
+#ifdef __sun__
+    def_pam_rhost = true;
+#endif
+    if ((def_pam_service = strdup("sudo")) == NULL)
+	goto oom;
+#ifdef HAVE_PAM_LOGIN
+    if ((def_pam_login_service = strdup("sudo-i")) == NULL)
+	goto oom;
+#else
+    if ((def_pam_login_service = strdup("sudo")) == NULL)
+	goto oom;
+#endif
+#ifdef NO_PAM_SESSION
+    def_pam_session = false;
+#else
+    def_pam_session = true;
+#endif
+#ifdef HAVE_SELINUX
+    def_selinux = true;
+#endif
+#ifdef HAVE_INNETGR
+    def_use_netgroups = true;
+#endif
+#ifdef _PATH_SUDO_ADMIN_FLAG
+    if ((def_admin_flag = strdup(_PATH_SUDO_ADMIN_FLAG)) == NULL)
+	goto oom;
+#endif
+    if ((def_rlimit_core = strdup("0,0")) == NULL)
+	goto oom;
+    def_intercept_type = dso;
+    def_intercept_verify = true;
+    def_netgroup_tuple = false;
+    def_sudoedit_checkdir = true;
+    def_iolog_mode = S_IRUSR|S_IWUSR;
+    def_fdexec = digest_only;
+    def_log_allowed = true;
+    def_log_denied = true;
+    def_log_format = sudo;
+    def_runas_allow_unknown_id = false;
+    def_noninteractive_auth = false;
+
+    /* Syslog options need special care since they both strings and ints */
+#if (LOGGING & SLOG_SYSLOG)
+    (void) store_syslogfac(LOGFAC, &sudo_defs_table[I_SYSLOG]);
+    (void) store_syslogpri(PRI_SUCCESS, &sudo_defs_table[I_SYSLOG_GOODPRI]);
+    (void) store_syslogpri(PRI_FAILURE, &sudo_defs_table[I_SYSLOG_BADPRI]);
+#endif
+
+    /* Password flags also have a string and integer component. */
+    (void) store_tuple("any", &sudo_defs_table[I_LISTPW]);
+    (void) store_tuple("all", &sudo_defs_table[I_VERIFYPW]);
+
+    /* Then initialize the int-like things. */
+#ifdef SUDO_UMASK
+    def_umask = SUDO_UMASK;
+#else
+    def_umask = ACCESSPERMS;
+#endif
+    def_loglinelen = MAXLOGFILELEN;
+    def_timestamp_timeout.tv_sec = TIMEOUT * 60;
+    def_passwd_timeout.tv_sec = PASSWORD_TIMEOUT * 60;
+    def_passwd_tries = TRIES_FOR_PASSWORD;
+#ifdef HAVE_ZLIB_H
+    def_compress_io = true;
+#endif
+    def_log_passwords = true;
+    def_log_server_timeout = 30;
+    def_log_server_verify = true;
+    def_log_server_keepalive = true;
+    def_ignore_audit_errors = true;
+    def_ignore_iolog_errors = false;
+    def_ignore_logfile_errors = true;
+
+    /* Now do the strings */
+    if ((def_mailto = strdup(MAILTO)) == NULL)
+	goto oom;
+    if ((def_mailsub = strdup(N_(MAILSUBJECT))) == NULL)
+	goto oom;
+    if ((def_badpass_message = strdup(_(INCORRECT_PASSWORD))) == NULL)
+	goto oom;
+    if ((def_lecture_status_dir = strdup(_PATH_SUDO_LECTURE_DIR)) == NULL)
+	goto oom;
+    if ((def_timestampdir = strdup(_PATH_SUDO_TIMEDIR)) == NULL)
+	goto oom;
+    if ((def_passprompt = strdup(_(PASSPROMPT))) == NULL)
+	goto oom;
+    if ((def_runas_default = strdup(RUNAS_DEFAULT)) == NULL)
+	goto oom;
+#ifdef _PATH_SUDO_SENDMAIL
+    if ((def_mailerpath = strdup(_PATH_SUDO_SENDMAIL)) == NULL)
+	goto oom;
+#endif
+    if ((def_mailerflags = strdup("-t")) == NULL)
+	goto oom;
+#if (LOGGING & SLOG_FILE)
+    if ((def_logfile = strdup(_PATH_SUDO_LOGFILE)) == NULL)
+	goto oom;
+#endif
+#ifdef EXEMPTGROUP
+    if ((def_exempt_group = strdup(EXEMPTGROUP)) == NULL)
+	goto oom;
+#endif
+#ifdef SECURE_PATH
+    if ((def_secure_path = strdup(SECURE_PATH)) == NULL)
+	goto oom;
+#endif
+    if ((def_editor = strdup(EDITOR)) == NULL)
+	goto oom;
+    def_set_utmp = true;
+    def_pam_acct_mgmt = true;
+    def_pam_setcred = true;
+    def_syslog_maxlen = MAXSYSLOGLEN;
+    def_case_insensitive_user = true;
+    def_case_insensitive_group = true;
+
+    /* Reset the locale. */
+    if (!firsttime) {
+	if (!sudoers_initlocale(NULL, def_sudoers_locale))
+	    goto oom;
+    }
+
+    /* Finally do the lists (currently just environment tables). */
+    if (!init_envtables())
+	goto oom;
+
+    /* Init eventlog config. */
+    init_eventlog_config();
+
+    /* Initial iolog password prompt regex. */
+    if (!init_passprompt_regex())
+	debug_return_bool(false);
+
+    firsttime = false;
+
+    debug_return_bool(true);
+oom:
+    sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
+    debug_return_bool(false);
+}
+
+/*
+ * Check whether a defaults entry matches the specified type.
+ * Returns true if it matches, else false.
+ */
+static bool
+default_type_matches(struct defaults *d, int what)
+{
+    debug_decl(default_type_matches, SUDOERS_DEBUG_DEFAULTS);
+
+    switch (d->type) {
+    case DEFAULTS:
+	if (ISSET(what, SETDEF_GENERIC))
+	    debug_return_bool(true);
+	break;
+    case DEFAULTS_USER:
+	if (ISSET(what, SETDEF_USER))
+	    debug_return_bool(true);
+	break;
+    case DEFAULTS_RUNAS:
+	if (ISSET(what, SETDEF_RUNAS))
+	    debug_return_bool(true);
+	break;
+    case DEFAULTS_HOST:
+	if (ISSET(what, SETDEF_HOST))
+	    debug_return_bool(true);
+	break;
+    case DEFAULTS_CMND:
+	if (ISSET(what, SETDEF_CMND))
+	    debug_return_bool(true);
+	break;
+    }
+    debug_return_bool(false);
+}
+
+/*
+ * Check whether a defaults entry's binding matches.
+ * Returns true if it matches, else false.
+ */
+static bool
+default_binding_matches(struct sudoers_parse_tree *parse_tree,
+    struct defaults *d, int what)
+{
+    debug_decl(default_binding_matches, SUDOERS_DEBUG_DEFAULTS);
+
+    switch (d->type) {
+    case DEFAULTS:
+	debug_return_bool(true);
+    case DEFAULTS_USER:
+	if (userlist_matches(parse_tree, sudo_user.pw, &d->binding->members) == ALLOW)
+	    debug_return_bool(true);
+	break;
+    case DEFAULTS_RUNAS:
+	if (runaslist_matches(parse_tree, &d->binding->members, NULL, NULL, NULL) == ALLOW)
+	    debug_return_bool(true);
+	break;
+    case DEFAULTS_HOST:
+	if (hostlist_matches(parse_tree, sudo_user.pw, &d->binding->members) == ALLOW)
+	    debug_return_bool(true);
+	break;
+    case DEFAULTS_CMND:
+	if (cmndlist_matches(parse_tree, &d->binding->members, NULL, NULL) == ALLOW)
+	    debug_return_bool(true);
+	break;
+    }
+    debug_return_bool(false);
+}
+
+/*
+ * Update the global defaults based on the given defaults list.
+ * Pass in an OR'd list of which default types to update.
+ */
+bool
+update_defaults(struct sudoers_parse_tree *parse_tree,
+    struct defaults_list *defs, int what, bool quiet)
+{
+    struct defaults *d;
+    bool global_defaults = false;
+    bool ret = true;
+    debug_decl(update_defaults, SUDOERS_DEBUG_DEFAULTS);
+
+    sudo_debug_printf(SUDO_DEBUG_INFO|SUDO_DEBUG_LINENO,
+	"what: 0x%02x", what);
+
+    /* If no defaults list specified, use the global one in the parse tree. */
+    if (defs == NULL) {
+	defs = &parse_tree->defaults;
+	global_defaults = true;
+    }
+
+    /*
+     * If using the global defaults list, apply Defaults values marked as early.
+     */
+    if (global_defaults) {
+	TAILQ_FOREACH(d, defs, entries) {
+	    struct early_default *early = is_early_default(d->var);
+	    if (early == NULL)
+		continue;
+
+	    /* Defaults type and binding must match. */
+	    if (!default_type_matches(d, what) ||
+		!default_binding_matches(parse_tree, d, what))
+		continue;
+
+	    /* Copy the value to sudo_defs_table and mark as early. */
+	    if (!set_early_default(d->var, d->val, d->op, d->file, d->line,
+		d->column, quiet, early))
+		ret = false;
+	}
+
+	/* Run callbacks for early defaults (if any) */
+	if (!run_early_defaults())
+	    ret = false;
+    }
+
+    /*
+     * Set the rest of the defaults and run their callbacks, if any.
+     */
+    TAILQ_FOREACH(d, defs, entries) {
+	if (global_defaults) {
+	    /* Skip Defaults marked as early, we already did them. */
+	    if (is_early_default(d->var))
+		continue;
+	}
+
+	/* Defaults type and binding must match. */
+	if (!default_type_matches(d, what) ||
+	    !default_binding_matches(parse_tree, d, what))
+	    continue;
+
+	/* Copy the value to sudo_defs_table and run callback (if any) */
+	if (!set_default(d->var, d->val, d->op, d->file, d->line, d->column, quiet))
+	    ret = false;
+    }
+
+    debug_return_bool(ret);
+}
+
+/*
+ * Check all defaults entries without actually setting them.
+ */
+bool
+check_defaults(struct sudoers_parse_tree *parse_tree, bool quiet)
+{
+    struct defaults *d;
+    bool ret = true;
+    int idx;
+    debug_decl(check_defaults, SUDOERS_DEBUG_DEFAULTS);
+
+    TAILQ_FOREACH(d, &parse_tree->defaults, entries) {
+	idx = find_default(d->var, d->file, d->line, d->column, quiet);
+	if (idx != -1) {
+	    struct sudo_defs_types def = sudo_defs_table[idx];
+	    memset(&def.sd_un, 0, sizeof(def.sd_un));
+	    if (parse_default_entry(&def, d->val, d->op, d->file,
+		d->line, d->column, quiet)) {
+		free_defs_val(def.type, &def.sd_un);
+		continue;
+	    }
+	}
+	/* There was an error in the entry, flag it. */
+	d->error = true;
+	ret = false;
+    }
+    debug_return_bool(ret);
+}
+
+static bool
+store_int(const char *str, struct sudo_defs_types *def)
+{
+    const char *errstr;
+    int i;
+    debug_decl(store_int, SUDOERS_DEBUG_DEFAULTS);
+
+    if (str == NULL) {
+	def->sd_un.ival = 0;
+    } else {
+	i = sudo_strtonum(str, INT_MIN, INT_MAX, &errstr);
+	if (errstr != NULL) {
+	    sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
+		"%s: %s", str, errstr);
+	    debug_return_bool(false);
+	}
+	def->sd_un.ival = i;
+    }
+    debug_return_bool(true);
+}
+
+static bool
+store_uint(const char *str, struct sudo_defs_types *def)
+{
+    const char *errstr;
+    unsigned int u;
+    debug_decl(store_uint, SUDOERS_DEBUG_DEFAULTS);
+
+    if (str == NULL) {
+	def->sd_un.uival = 0;
+    } else {
+	u = sudo_strtonum(str, 0, UINT_MAX, &errstr);
+	if (errstr != NULL) {
+	    sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
+		"%s: %s", str, errstr);
+	    debug_return_bool(false);
+	}
+	def->sd_un.uival = u;
+    }
+    debug_return_bool(true);
+}
+
+/* Check resource limit syntax, does not save as rlim_t. */
+static bool
+check_rlimit(const char *str, bool soft)
+{
+    const size_t inflen = sizeof("infinity") - 1;
+    debug_decl(check_rlimit, SUDOERS_DEBUG_DEFAULTS);
+
+    if (isdigit((unsigned char)*str)) {
+	unsigned long long ullval;
+	char *ep;
+
+	errno = 0;
+#ifdef HAVE_STRTOULL
+	ullval = strtoull(str, &ep, 10);
+	if (str == ep || (errno == ERANGE && ullval == ULLONG_MAX))
+	    debug_return_bool(false);
+#else
+	ullval = strtoul(str, &ep, 10);
+	if (str == ep || (errno == ERANGE && ullval == ULONG_MAX))
+	    debug_return_bool(false);
+#endif
+	if (*ep == '\0' || (soft && *ep == ','))
+	    debug_return_bool(true);
+	debug_return_bool(false);
+    }
+    if (strncmp(str, "infinity", inflen) == 0) {
+	if (str[inflen] == '\0' || (soft && str[inflen] == ','))
+	    debug_return_bool(true);
+    }
+    debug_return_bool(false);
+}
+
+static bool
+store_rlimit(const char *str, struct sudo_defs_types *def)
+{
+    debug_decl(store_rlimit, SUDOERS_DEBUG_DEFAULTS);
+
+    /* The special values "user" and "default" are not compound. */
+    if (str != NULL && strcmp(str, "user") != 0 && strcmp(str, "default") != 0) {
+	const char *hard, *soft = str;
+	/*
+	 * Expect a limit in the form "soft,hard" or "limit" (both soft+hard).
+	 */
+	hard = strchr(str, ',');
+	if (hard != NULL)
+	    hard++;
+	else
+	    hard = soft;
+
+	if (!check_rlimit(soft, true))
+	    debug_return_bool(false);
+	if (!check_rlimit(hard, false))
+	    debug_return_bool(false);
+    }
+
+    /* Store as string, front-end will parse it as a limit. */
+    debug_return_bool(store_str(str, def));
+}
+
+static bool
+store_timespec(const char *str, struct sudo_defs_types *def)
+{
+    struct timespec ts;
+    char sign = '+';
+    long i;
+    debug_decl(store_timespec, SUDOERS_DEBUG_DEFAULTS);
+
+    sudo_timespecclear(&ts);
+    if (str != NULL) {
+	/* Convert from minutes to seconds. */
+	if (*str == '+' || *str == '-')
+	    sign = *str++;
+	while (*str != '\0' && *str != '.') {
+		if (!isdigit((unsigned char)*str))
+		    debug_return_bool(false);	/* invalid number */
+
+		/* Verify (ts.tv_sec * 10) + (digit * 60) <= TIME_T_MAX. */
+		i = (*str++ - '0') * 60L;
+		if (ts.tv_sec > (TIME_T_MAX - i) / 10)
+		    debug_return_bool(false);	/* overflow */
+		ts.tv_sec *= 10;
+		ts.tv_sec += i;
+	}
+	if (*str++ == '.') {
+	    long long nsec = 0;
+
+	    /* Convert optional fractional component to seconds and nanosecs. */
+	    for (i = 100000000; i > 0; i /= 10) {
+		if (*str == '\0')
+		    break;
+		if (!isdigit((unsigned char)*str))
+		    debug_return_bool(false);	/* invalid number */
+		nsec += i * (*str++ - '0') * 60LL;
+	    }
+	    while (nsec >= 1000000000) {
+		if (ts.tv_sec == TIME_T_MAX)
+		    debug_return_bool(false);	/* overflow */
+		ts.tv_sec++;
+		nsec -= 1000000000;
+	    }
+	    ts.tv_nsec = nsec;
+	}
+    }
+    if (sign == '-') {
+	def->sd_un.tspec.tv_sec = -ts.tv_sec;
+	def->sd_un.tspec.tv_nsec = -ts.tv_nsec;
+    } else {
+	def->sd_un.tspec.tv_sec = ts.tv_sec;
+	def->sd_un.tspec.tv_nsec = ts.tv_nsec;
+    }
+    debug_return_bool(true);
+}
+
+static bool
+store_tuple(const char *str, struct sudo_defs_types *def)
+{
+    struct def_values *v;
+    debug_decl(store_tuple, SUDOERS_DEBUG_DEFAULTS);
+
+    /*
+     * Look up tuple value by name to find enum def_tuple value.
+     * For negation to work the first element of enum def_tuple
+     * must be equivalent to boolean false.
+     */
+    if (str == NULL) {
+	def->sd_un.ival = 0;
+    } else {
+	for (v = def->values; v->sval != NULL; v++) {
+	    if (strcmp(v->sval, str) == 0) {
+		def->sd_un.tuple = v->nval;
+		break;
+	    }
+	}
+	if (v->sval == NULL)
+	    debug_return_bool(false);
+    }
+    debug_return_bool(true);
+}
+
+static int
+store_str(const char *str, struct sudo_defs_types *def)
+{
+    debug_decl(store_str, SUDOERS_DEBUG_DEFAULTS);
+
+    free(def->sd_un.str);
+    if (str == NULL) {
+	def->sd_un.str = NULL;
+    } else {
+	if ((def->sd_un.str = strdup(str)) == NULL) {
+	    sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
+	    debug_return_int(-1);
+	}
+    }
+    debug_return_int(true);
+}
+
+static bool
+store_list(const char *str, struct sudo_defs_types *def, int op)
+{
+    debug_decl(store_list, SUDOERS_DEBUG_DEFAULTS);
+
+    /* Remove all old members. */
+    if (op == false || op == true)
+	(void)list_op(NULL, 0, &def->sd_un.list, freeall);
+
+    /* Split str into multiple space-separated words and act on each one. */
+    if (str != NULL) {
+	const char *cp, *ep;
+	const char *end = str + strlen(str);
+	const enum list_ops lop = op == '-' ? delete : add;
+
+	if (ISSET(def->type, T_SPACE)) {
+	    if (!list_op(str, strlen(str), &def->sd_un.list, lop))
+		debug_return_bool(false);
+	} else {
+	    for (cp = sudo_strsplit(str, end, " \t", &ep); cp != NULL;
+		cp = sudo_strsplit(NULL, end, " \t", &ep)) {
+		if (!list_op(cp, ep - cp, &def->sd_un.list, lop))
+		    debug_return_bool(false);
+	    }
+	}
+    }
+    debug_return_bool(true);
+}
+
+static bool
+store_syslogfac(const char *str, struct sudo_defs_types *def)
+{
+    debug_decl(store_syslogfac, SUDOERS_DEBUG_DEFAULTS);
+
+    if (str == NULL) {
+	def->sd_un.ival = false;
+	debug_return_bool(true);
+    }
+    debug_return_bool(sudo_str2logfac(str, &def->sd_un.ival));
+}
+
+static bool
+store_syslogpri(const char *str, struct sudo_defs_types *def)
+{
+    debug_decl(store_syslogpri, SUDOERS_DEBUG_DEFAULTS);
+
+    if (str == NULL) {
+	def->sd_un.ival = -1;
+	debug_return_bool(true);
+    }
+    debug_return_bool(sudo_str2logpri(str, &def->sd_un.ival));
+}
+
+static bool
+store_mode(const char *str, struct sudo_defs_types *def)
+{
+    mode_t mode;
+    const char *errstr;
+    debug_decl(store_mode, SUDOERS_DEBUG_DEFAULTS);
+
+    if (str == NULL) {
+	def->sd_un.mode = ACCESSPERMS;
+    } else {
+	mode = sudo_strtomode(str, &errstr);
+	if (errstr != NULL) {
+	    sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
+		"%s is %s", str, errstr);
+	    debug_return_bool(false);
+	}
+	def->sd_un.mode = mode;
+    }
+    debug_return_bool(true);
+}
+
+static bool
+store_timeout(const char *str, struct sudo_defs_types *def)
+{
+    debug_decl(store_mode, SUDOERS_DEBUG_DEFAULTS);
+
+    if (str == NULL) {
+	def->sd_un.ival = 0;
+    } else {
+	int seconds = parse_timeout(str);
+	if (seconds == -1) {
+	    sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_ERRNO|SUDO_DEBUG_LINENO,
+		"%s", str);
+	    debug_return_bool(false);
+	}
+	def->sd_un.ival = seconds;
+    }
+    debug_return_bool(true);
+}
+
+static bool
+valid_path(struct sudo_defs_types *def, const char *val,
+    const char *file, int line, int column, bool quiet)
+{
+    bool ret = true;
+    debug_decl(valid_path, SUDOERS_DEBUG_DEFAULTS);
+
+    if (strlen(val) >= PATH_MAX) {
+	defaults_warnx(file, line, column, quiet,
+	    N_("path name for \"%s\" too long"), def->name);
+	ret = false;
+    }
+    if (ISSET(def->type, T_CHPATH)) {
+	if (val[0] != '/' && val[0] != '~' && (val[0] != '*' || val[1] != '\0')) {
+	    defaults_warnx(file, line, column, quiet,
+		N_("values for \"%s\" must start with a '/', '~', or '*'"),
+		def->name);
+	    ret = false;
+	}
+    } else {
+	if (val[0] != '/') {
+	    defaults_warnx(file, line, column, quiet,
+		N_("values for \"%s\" must start with a '/'"), def->name);
+	    ret = false;
+	}
+
+    }
+    debug_return_bool(ret);
+}
+
+static bool
+list_op(const char *str, size_t len, struct list_members *list,
+    enum list_ops op)
+{
+    struct list_member *cur, *prev = NULL;
+    debug_decl(list_op, SUDOERS_DEBUG_DEFAULTS);
+
+    if (op == freeall) {
+	while ((cur = SLIST_FIRST(list)) != NULL) {
+	    SLIST_REMOVE_HEAD(list, entries);
+	    free(cur->value);
+	    free(cur);
+	}
+	debug_return_bool(true);
+    }
+
+    SLIST_FOREACH(cur, list, entries) {
+	if ((strncmp(cur->value, str, len) == 0 && cur->value[len] == '\0')) {
+
+	    if (op == add)
+		debug_return_bool(true); /* already exists */
+
+	    /* Delete node */
+	    if (prev == NULL)
+		SLIST_REMOVE_HEAD(list, entries);
+	    else
+		SLIST_REMOVE_AFTER(prev, entries);
+	    free(cur->value);
+	    free(cur);
+	    break;
+	}
+	prev = cur;
+    }
+
+    /* Add new node to the head of the list. */
+    if (op == add) {
+	cur = calloc(1, sizeof(struct list_member));
+	if (cur == NULL || (cur->value = strndup(str, len)) == NULL) {
+	    sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
+	    free(cur);
+	    debug_return_bool(false);
+	}
+	SLIST_INSERT_HEAD(list, cur, entries);
+    }
+    debug_return_bool(true);
+}
+
+bool
+append_default(const char *var, const char *val, int op,
+    char *source, struct defaults_list *defs)
+{
+    struct defaults *def;
+    debug_decl(append_default, SUDOERS_DEBUG_DEFAULTS);
+
+    if ((def = calloc(1, sizeof(*def))) == NULL)
+	goto oom;
+
+    def->type = DEFAULTS;
+    def->op = op;
+    if ((def->var = strdup(var)) == NULL) {
+	goto oom;
+    }
+    if (val != NULL) {
+	if ((def->val = strdup(val)) == NULL)
+	    goto oom;
+    }
+    def->file = source;
+    sudo_rcstr_addref(source);
+    TAILQ_INSERT_TAIL(defs, def, entries);
+    debug_return_bool(true);
+
+oom:
+    if (def != NULL) {
+	free(def->var);
+	free(def->val);
+	free(def);
+    }
+    debug_return_bool(false);
+}
+
+bool
+cb_passprompt_regex(const char *file, int line, int column,
+    const union sudo_defs_val *sd_un, int op)
+{
+    struct list_member *lm;
+    const char *errstr;
+    debug_decl(cb_passprompt_regex, SUDOERS_DEBUG_DEFAULTS);
+
+    /* If adding one or more regexps, make sure they are valid. */
+    if (op == '+' || op == true) {
+	SLIST_FOREACH(lm, &sd_un->list, entries) {
+	    if (!sudo_regex_compile(NULL, lm->value, &errstr)) {
+		defaults_warnx(file, line, column, false,
+		    U_("invalid regular expression \"%s\": %s"),
+		    lm->value, U_(errstr));
+		debug_return_bool(false);
+	    }
+	}
+    }
+
+    debug_return_bool(true);
+}
+
+static bool
+defaults_warnx(const char *file, int line, int column, bool quiet,
+    const char *fmt, ...)
+{
+    bool ret = true;
+    va_list ap;
+    debug_decl(defaults_warnx, SUDOERS_DEBUG_DEFAULTS);
+
+    if (sudoers_error_hook != NULL) {
+	va_start(ap, fmt);
+	ret = sudoers_error_hook(file, line, column, fmt, ap);
+	va_end(ap);
+    }
+
+    if (!quiet) {
+	int oldlocale;
+	char *errstr;
+
+	sudoers_setlocale(SUDOERS_LOCALE_USER, &oldlocale);
+	va_start(ap, fmt);
+	if (vasprintf(&errstr, _(fmt), ap) == -1) {
+	    errstr = NULL;
+	    ret = false;
+	} else if (line > 0) {
+	    sudo_printf(SUDO_CONV_ERROR_MSG, _("%s:%d:%d: %s\n"), file,
+		line, column, errstr);
+	} else {
+	    sudo_printf(SUDO_CONV_ERROR_MSG, _("%s: %s\n"), file, errstr);
+	}
+	va_end(ap);
+	sudoers_setlocale(oldlocale, NULL);
+
+	free(errstr);
+    }
+
+    debug_return_bool(ret);
+}