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sudo/plugins/sudoers/defaults.c

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/*
* SPDX-License-Identifier: ISC
*
* Copyright (c) 1999-2005, 2007-2023
* 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, int op);
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 store_plugin(const char *str, struct sudo_defs_types *def, int op);
static bool list_op(const char *str, size_t, struct list_members *list, enum list_ops op);
static bool valid_path(const struct sudoers_context *ctx, const struct sudo_defs_types *def, const char *val, const char *file, int line, int column, bool quiet);
/*
* Table describing compile-time and run-time options.
*/
#include <def_data.c>
/*
* Print version and configure info.
*/
void
dump_defaults(void)
{
const struct sudo_defs_types *cur;
const struct list_member *item;
const 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 = (double)cur->sd_un.tspec.tv_sec +
((double)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;
}
static bool
defaults_warnx(const struct sudoers_context *ctx, const char *file, int line,
int column, bool quiet, const char * restrict fmt, ...)
{
va_list ap;
bool ret;
debug_decl(defaults_warnx, SUDOERS_DEBUG_DEFAULTS);
va_start(ap, fmt);
ret = parser_vwarnx(ctx, file, line, column, true, quiet, fmt, ap);
va_end(ap);
debug_return_bool(ret);
}
/*
* 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 struct sudoers_context *ctx, 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(ctx, 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(const struct sudoers_context *ctx,
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_LOGFAC:
if (op == true) {
/* Use default syslog facility if none specified. */
val = LOGFAC;
}
break;
case T_FLAG:
break;
case T_TUPLE:
if (ISSET(def->type, T_BOOL))
break;
FALLTHROUGH;
default:
if (!ISSET(def->type, T_BOOL) || op != false) {
defaults_warnx(ctx, 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(ctx, 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(ctx, 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(ctx, file, line, column, quiet,
N_("option \"%s\" does not take a value"), def->name);
rc = -1;
break;
}
def->sd_un.flag = (bool)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, op);
break;
case T_TIMESPEC:
rc = store_timespec(val, def);
break;
case T_PLUGIN:
rc = store_plugin(val, def, op);
break;
case T_RLIMIT:
rc = store_rlimit(val, def);
break;
default:
defaults_warnx(ctx, 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(ctx, 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(struct sudoers_context *ctx, 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(ctx, 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(struct sudoers_context *ctx, 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(ctx, 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(ctx, def, val, op, file, line, column, quiet))
debug_return_bool(run_callback(ctx, 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 struct sudoers_context *ctx, 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(ctx, 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(ctx, 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(struct sudoers_context *ctx)
{
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(ctx, 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
#ifdef SUDOERS_NAME_MATCH
def_fast_glob = true;
def_fdexec = never;
#else
def_fdexec = digest_only;
#endif
def_timestamp_type = TIMESTAMP_TYPE;
if ((def_iolog_file = strdup(IOLOG_FILE)) == 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 _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_use_netgroups = true;
def_netgroup_tuple = false;
def_sudoedit_checkdir = true;
def_iolog_mode = S_IRUSR|S_IWUSR;
def_log_allowed = true;
def_log_denied = true;
def_log_format = sudo;
def_runas_allow_unknown_id = false;
def_noninteractive_auth = false;
def_use_pty = true;
/* 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], 0);
(void) store_tuple("all", &sudo_defs_table[I_VERIFYPW], 0);
/* 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_ignore_audit_errors = true;
def_ignore_iolog_errors = false;
def_ignore_logfile_errors = true;
def_log_passwords = true;
#ifdef SUDOERS_LOG_CLIENT
def_log_server_timeout = 30;
def_log_server_verify = true;
def_log_server_keepalive = true;
#endif
/* 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;
#ifdef _PATH_SUDO_LECTURE_DIR
if ((def_lecture_status_dir = strdup(_PATH_SUDO_LECTURE_DIR)) == NULL)
goto oom;
#endif
#ifdef _PATH_SUDO_TIMEDIR
if ((def_timestampdir = strdup(_PATH_SUDO_TIMEDIR)) == NULL)
goto oom;
#endif
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_pam_silent = 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(const 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(const struct sudoers_context *ctx,
struct sudoers_parse_tree *parse_tree, const 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, ctx->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, ctx->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_context *ctx,
struct sudoers_parse_tree *parse_tree,
const struct defaults_list *defs, int what, bool quiet)
{
const 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(ctx, parse_tree, d, what))
continue;
/* Copy the value to sudo_defs_table and mark as early. */
if (!set_early_default(ctx, 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(ctx))
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(ctx, parse_tree, d, what))
continue;
/* Copy the value to sudo_defs_table and run callback (if any) */
if (!set_default(ctx, 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(const struct sudoers_parse_tree *parse_tree, bool quiet)
{
const 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(parse_tree->ctx, 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(parse_tree->ctx, &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. */
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 = (int)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 = (unsigned int)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 = (long)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, int op)
{
const struct def_values *v;
debug_decl(store_tuple, SUDOERS_DEBUG_DEFAULTS);
/*
* Look up tuple value by name to find enum def_tuple value.
* A tuple must have at least two possible values.
*/
if (str == NULL) {
/*
* Boolean context: true maps to values[1], false maps to values[0].
*/
if (op == true) {
v = &def->values[1];
def->sd_un.ival = v->nval;
} else if (op == false) {
v = &def->values[0];
def->sd_un.ival = v->nval;
} else {
debug_return_bool(false);
}
} 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, (size_t)(ep - cp), &def->sd_un.list, lop))
debug_return_bool(false);
}
}
}
debug_return_bool(true);
}
static bool
store_plugin(const char *str, struct sudo_defs_types *def, int op)
{
const enum list_ops lop = op == '-' ? delete : add;
debug_decl(store_plugin, SUDOERS_DEBUG_DEFAULTS);
/* Remove all old members. */
if (op == false || op == true)
(void)list_op(NULL, 0, &def->sd_un.list, freeall);
if (str != NULL) {
if (!list_op(str, strlen(str), &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(const struct sudoers_context *ctx, const 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(ctx, 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(ctx, file, line, column, quiet,
N_("values for \"%s\" must start with a '/', '~', or '*'"),
def->name);
ret = false;
}
} else {
if (val[0] != '/') {
defaults_warnx(ctx, 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(struct sudoers_context *ctx, 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(ctx, file, line, column, false,
U_("invalid regular expression \"%s\": %s"),
lm->value, U_(errstr));
debug_return_bool(false);
}
}
}
debug_return_bool(true);
}
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