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cf7ec7a3ccf873067c29f265e39c5756d150de1f
sudo/plugins/sudoers/defaults.c
Todd C. Miller 7debf44742 Move noexec path into sudo.conf now that sudo itself handles noexec. 
Currently can be configured in sudoers too but is now undocumented
and will be removed in a future release.
2011-03-10 16:12:33 -05:00

812 lines
19 KiB
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/*
* Copyright (c) 1999-2005, 2007-2011
* Todd C. Miller <Todd.Miller@courtesan.com>
*
* 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.
*/
#include <config.h>
#include <sys/types.h>
#include <sys/param.h>
#include <stdio.h>
#ifdef STDC_HEADERS
# include <stdlib.h>
# include <stddef.h>
#else
# ifdef HAVE_STDLIB_H
# include <stdlib.h>
# endif
#endif /* STDC_HEADERS */
#ifdef HAVE_STRING_H
# include <string.h>
#endif /* HAVE_STRING_H */
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif /* HAVE_STRINGS_H */
# ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif /* HAVE_UNISTD_H */
#include <pwd.h>
#include <ctype.h>
#include "sudoers.h"
#include "parse.h"
#include <gram.h>
/*
* For converting between syslog numbers and strings.
*/
struct strmap {
char *name;
int num;
};
#ifdef LOG_NFACILITIES
static struct strmap facilities[] = {
#ifdef LOG_AUTHPRIV
{ "authpriv", LOG_AUTHPRIV },
#endif
{ "auth", LOG_AUTH },
{ "daemon", LOG_DAEMON },
{ "user", LOG_USER },
{ "local0", LOG_LOCAL0 },
{ "local1", LOG_LOCAL1 },
{ "local2", LOG_LOCAL2 },
{ "local3", LOG_LOCAL3 },
{ "local4", LOG_LOCAL4 },
{ "local5", LOG_LOCAL5 },
{ "local6", LOG_LOCAL6 },
{ "local7", LOG_LOCAL7 },
{ NULL, -1 }
};
#endif /* LOG_NFACILITIES */
static struct strmap priorities[] = {
{ "alert", LOG_ALERT },
{ "crit", LOG_CRIT },
{ "debug", LOG_DEBUG },
{ "emerg", LOG_EMERG },
{ "err", LOG_ERR },
{ "info", LOG_INFO },
{ "notice", LOG_NOTICE },
{ "warning", LOG_WARNING },
{ NULL, -1 }
};
/*
* Local prototypes.
*/
static int store_int(char *, struct sudo_defs_types *, int);
static int store_list(char *, struct sudo_defs_types *, int);
static int store_mode(char *, struct sudo_defs_types *, int);
static int store_str(char *, struct sudo_defs_types *, int);
static int store_syslogfac(char *, struct sudo_defs_types *, int);
static int store_syslogpri(char *, struct sudo_defs_types *, int);
static int store_tuple(char *, struct sudo_defs_types *, int);
static int store_uint(char *, struct sudo_defs_types *, int);
static int store_float(char *, struct sudo_defs_types *, int);
static void list_op(char *, size_t, struct sudo_defs_types *, enum list_ops);
static const char *logfac2str(int);
static const char *logpri2str(int);
/*
* 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;
for (cur = sudo_defs_table; cur->name; cur++) {
if (cur->desc) {
switch (cur->type & T_MASK) {
case T_FLAG:
if (cur->sd_un.flag)
sudo_printf(SUDO_CONV_INFO_MSG, "%s\n", cur->desc);
break;
case T_STR:
if (cur->sd_un.str) {
sudo_printf(SUDO_CONV_INFO_MSG,
cur->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,
cur->desc, 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,
cur->desc, logpri2str(cur->sd_un.ival));
sudo_printf(SUDO_CONV_INFO_MSG, "\n");
}
break;
case T_UINT:
case T_INT:
sudo_printf(SUDO_CONV_INFO_MSG, cur->desc, cur->sd_un.ival);
sudo_printf(SUDO_CONV_INFO_MSG, "\n");
break;
case T_FLOAT:
sudo_printf(SUDO_CONV_INFO_MSG, cur->desc, cur->sd_un.fval);
sudo_printf(SUDO_CONV_INFO_MSG, "\n");
break;
case T_MODE:
sudo_printf(SUDO_CONV_INFO_MSG, cur->desc, cur->sd_un.mode);
sudo_printf(SUDO_CONV_INFO_MSG, "\n");
break;
case T_LIST:
if (cur->sd_un.list) {
sudo_printf(SUDO_CONV_INFO_MSG, "%s\n", cur->desc);
for (item = cur->sd_un.list; item; item = item->next) {
sudo_printf(SUDO_CONV_INFO_MSG,
"\t%s\n", item->value);
}
}
break;
case T_TUPLE:
for (def = cur->values; def->sval; def++) {
if (cur->sd_un.ival == def->ival) {
sudo_printf(SUDO_CONV_INFO_MSG,
cur->desc, def->sval);
break;
}
}
sudo_printf(SUDO_CONV_INFO_MSG, "\n");
break;
}
}
}
}
/*
* List each option along with its description.
*/
void
list_options(void)
{
struct sudo_defs_types *cur;
char *p;
sudo_printf(SUDO_CONV_INFO_MSG,
"Available options in a sudoers ``Defaults'' line:\n\n");
for (cur = sudo_defs_table; cur->name; cur++) {
if (cur->name && cur->desc) {
switch (cur->type & T_MASK) {
case T_FLAG:
sudo_printf(SUDO_CONV_INFO_MSG,
"%s: %s\n", cur->name, cur->desc);
break;
default:
p = strrchr(cur->desc, ':');
if (p) {
sudo_printf(SUDO_CONV_INFO_MSG, "%s: %.*s\n",
cur->name, (int) (p - cur->desc), cur->desc);
} else {
sudo_printf(SUDO_CONV_INFO_MSG,
"%s: %s\n", cur->name, cur->desc);
}
break;
}
}
}
}
/*
* Sets/clears an entry in the defaults structure
* If a variable that takes a value is used in a boolean
* context with op == 0, disable that variable.
* Eg. you may want to turn off logging to a file for some hosts.
* This is only meaningful for variables that are *optional*.
*/
int
set_default(char *var, char *val, int op)
{
struct sudo_defs_types *cur;
int num;
for (cur = sudo_defs_table, num = 0; cur->name; cur++, num++) {
if (strcmp(var, cur->name) == 0)
break;
}
if (!cur->name) {
warningx("unknown defaults entry `%s'", var);
return FALSE;
}
switch (cur->type & T_MASK) {
case T_LOGFAC:
if (!store_syslogfac(val, cur, op)) {
if (val)
warningx("value `%s' is invalid for option `%s'", val, var);
else
warningx("no value specified for `%s'", var);
return FALSE;
}
break;
case T_LOGPRI:
if (!store_syslogpri(val, cur, op)) {
if (val)
warningx("value `%s' is invalid for option `%s'", val, var);
else
warningx("no value specified for `%s'", var);
return FALSE;
}
break;
case T_STR:
if (!val) {
/* Check for bogus boolean usage or lack of a value. */
if (!ISSET(cur->type, T_BOOL) || op != FALSE) {
warningx("no value specified for `%s'", var);
return FALSE;
}
}
if (ISSET(cur->type, T_PATH) && val && *val != '/') {
warningx("values for `%s' must start with a '/'", var);
return FALSE;
}
if (!store_str(val, cur, op)) {
warningx("value `%s' is invalid for option `%s'", val, var);
return FALSE;
}
break;
case T_INT:
if (!val) {
/* Check for bogus boolean usage or lack of a value. */
if (!ISSET(cur->type, T_BOOL) || op != FALSE) {
warningx("no value specified for `%s'", var);
return FALSE;
}
}
if (!store_int(val, cur, op)) {
warningx("value `%s' is invalid for option `%s'", val, var);
return FALSE;
}
break;
case T_UINT:
if (!val) {
/* Check for bogus boolean usage or lack of a value. */
if (!ISSET(cur->type, T_BOOL) || op != FALSE) {
warningx("no value specified for `%s'", var);
return FALSE;
}
}
if (!store_uint(val, cur, op)) {
warningx("value `%s' is invalid for option `%s'", val, var);
return FALSE;
}
break;
case T_FLOAT:
if (!val) {
/* Check for bogus boolean usage or lack of a value. */
if (!ISSET(cur->type, T_BOOL) || op != FALSE) {
warningx("no value specified for `%s'", var);
return FALSE;
}
}
if (!store_float(val, cur, op)) {
warningx("value `%s' is invalid for option `%s'", val, var);
return FALSE;
}
break;
case T_MODE:
if (!val) {
/* Check for bogus boolean usage or lack of a value. */
if (!ISSET(cur->type, T_BOOL) || op != FALSE) {
warningx("no value specified for `%s'", var);
return FALSE;
}
}
if (!store_mode(val, cur, op)) {
warningx("value `%s' is invalid for option `%s'", val, var);
return FALSE;
}
break;
case T_FLAG:
if (val) {
warningx("option `%s' does not take a value", var);
return FALSE;
}
cur->sd_un.flag = op;
break;
case T_LIST:
if (!val) {
/* Check for bogus boolean usage or lack of a value. */
if (!ISSET(cur->type, T_BOOL) || op != FALSE) {
warningx("no value specified for `%s'", var);
return FALSE;
}
}
if (!store_list(val, cur, op)) {
warningx("value `%s' is invalid for option `%s'", val, var);
return FALSE;
}
break;
case T_TUPLE:
if (!val && !ISSET(cur->type, T_BOOL)) {
warningx("no value specified for `%s'", var);
return FALSE;
}
if (!store_tuple(val, cur, op)) {
warningx("value `%s' is invalid for option `%s'", val, var);
return FALSE;
}
break;
}
return TRUE;
}
/*
* Set default options to compiled-in values.
* Any of these may be overridden at runtime by a "Defaults" file.
*/
void
init_defaults(void)
{
static int firsttime = 1;
struct sudo_defs_types *def;
/* Clear any old settings. */
if (!firsttime) {
for (def = sudo_defs_table; def->name; def++) {
switch (def->type & T_MASK) {
case T_STR:
efree(def->sd_un.str);
def->sd_un.str = NULL;
break;
case T_LIST:
list_op(NULL, 0, def, freeall);
break;
}
zero_bytes(&def->sd_un, sizeof(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_TTY_TICKETS
def_tty_tickets = 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 FQDN
def_fqdn = TRUE;
#endif
#ifdef USE_INSULTS
def_insults = TRUE;
#endif
#ifdef ENV_EDITOR
def_env_editor = TRUE;
#endif
#ifdef UMASK_OVERRIDE
def_umask_override = TRUE;
#endif
def_iolog_file = estrdup("%{seq}");
def_iolog_dir = estrdup(_PATH_SUDO_IO_LOGDIR);
def_sudoers_locale = estrdup("C");
def_env_reset = ENV_RESET;
def_set_logname = TRUE;
def_closefrom = STDERR_FILENO + 1;
/* Syslog options need special care since they both strings and ints */
#if (LOGGING & SLOG_SYSLOG)
(void) store_syslogfac(LOGFAC, &sudo_defs_table[I_SYSLOG], TRUE);
(void) store_syslogpri(PRI_SUCCESS, &sudo_defs_table[I_SYSLOG_GOODPRI],
TRUE);
(void) store_syslogpri(PRI_FAILURE, &sudo_defs_table[I_SYSLOG_BADPRI],
TRUE);
#endif
/* Password flags also have a string and integer component. */
(void) store_tuple("any", &sudo_defs_table[I_LISTPW], TRUE);
(void) store_tuple("all", &sudo_defs_table[I_VERIFYPW], TRUE);
/* Then initialize the int-like things. */
#ifdef SUDO_UMASK
def_umask = SUDO_UMASK;
#else
def_umask = 0777;
#endif
def_loglinelen = MAXLOGFILELEN;
def_timestamp_timeout = TIMEOUT;
def_passwd_timeout = PASSWORD_TIMEOUT;
def_passwd_tries = TRIES_FOR_PASSWORD;
#ifdef HAVE_ZLIB_H
def_compress_io = TRUE;
#endif
/* Now do the strings */
def_mailto = estrdup(MAILTO);
def_mailsub = estrdup(MAILSUBJECT);
def_badpass_message = estrdup(INCORRECT_PASSWORD);
def_timestampdir = estrdup(_PATH_SUDO_TIMEDIR);
def_passprompt = estrdup(PASSPROMPT);
def_runas_default = estrdup(RUNAS_DEFAULT);
#ifdef _PATH_SUDO_SENDMAIL
def_mailerpath = estrdup(_PATH_SUDO_SENDMAIL);
def_mailerflags = estrdup("-t");
#endif
#if (LOGGING & SLOG_FILE)
def_logfile = estrdup(_PATH_SUDO_LOGFILE);
#endif
#ifdef EXEMPTGROUP
def_exempt_group = estrdup(EXEMPTGROUP);
#endif
#ifdef SECURE_PATH
def_secure_path = estrdup(SECURE_PATH);
#endif
def_editor = estrdup(EDITOR);
/* Finally do the lists (currently just environment tables). */
init_envtables();
firsttime = 0;
}
/*
* Update the defaults based on what was set by sudoers.
* Pass in an OR'd list of which default types to update.
*/
int
update_defaults(int what)
{
struct defaults *def;
int rc = TRUE;
tq_foreach_fwd(&defaults, def) {
switch (def->type) {
case DEFAULTS:
if (ISSET(what, SETDEF_GENERIC) &&
!set_default(def->var, def->val, def->op))
rc = FALSE;
break;
case DEFAULTS_USER:
if (ISSET(what, SETDEF_USER) &&
userlist_matches(sudo_user.pw, &def->binding) == ALLOW &&
!set_default(def->var, def->val, def->op))
rc = FALSE;
break;
case DEFAULTS_RUNAS:
if (ISSET(what, SETDEF_RUNAS) &&
runaslist_matches(&def->binding, NULL) == ALLOW &&
!set_default(def->var, def->val, def->op))
rc = FALSE;
break;
case DEFAULTS_HOST:
if (ISSET(what, SETDEF_HOST) &&
hostlist_matches(&def->binding) == ALLOW &&
!set_default(def->var, def->val, def->op))
rc = FALSE;
break;
case DEFAULTS_CMND:
if (ISSET(what, SETDEF_CMND) &&
cmndlist_matches(&def->binding) == ALLOW &&
!set_default(def->var, def->val, def->op))
rc = FALSE;
break;
}
}
return rc;
}
static int
store_int(char *val, struct sudo_defs_types *def, int op)
{
char *endp;
long l;
if (op == FALSE) {
def->sd_un.ival = 0;
} else {
l = strtol(val, &endp, 10);
if (*endp != '\0')
return FALSE;
/* XXX - should check against INT_MAX */
def->sd_un.ival = (int)l;
}
if (def->callback)
return def->callback(val);
return TRUE;
}
static int
store_uint(char *val, struct sudo_defs_types *def, int op)
{
char *endp;
long l;
if (op == FALSE) {
def->sd_un.ival = 0;
} else {
l = strtol(val, &endp, 10);
if (*endp != '\0' || l < 0)
return FALSE;
/* XXX - should check against INT_MAX */
def->sd_un.ival = (unsigned int)l;
}
if (def->callback)
return def->callback(val);
return TRUE;
}
static int
store_float(char *val, struct sudo_defs_types *def, int op)
{
char *endp;
double d;
if (op == FALSE) {
def->sd_un.fval = 0.0;
} else {
d = strtod(val, &endp);
if (*endp != '\0')
return FALSE;
/* XXX - should check against HUGE_VAL */
def->sd_un.fval = d;
}
if (def->callback)
return def->callback(val);
return TRUE;
}
static int
store_tuple(char *val, struct sudo_defs_types *def, int op)
{
struct def_values *v;
/*
* Since enums are really just ints we store the value as an ival.
* In the future, there may be multiple enums for different tuple
* types we want to avoid and special knowledge of the tuple type.
* This does assume that the first entry in the tuple enum will
* be the equivalent to a boolean "false".
*/
if (!val) {
def->sd_un.ival = (op == FALSE) ? 0 : 1;
} else {
for (v = def->values; v->sval != NULL; v++) {
if (strcmp(v->sval, val) == 0) {
def->sd_un.ival = v->ival;
break;
}
}
if (v->sval == NULL)
return FALSE;
}
if (def->callback)
return def->callback(val);
return TRUE;
}
static int
store_str(char *val, struct sudo_defs_types *def, int op)
{
efree(def->sd_un.str);
if (op == FALSE)
def->sd_un.str = NULL;
else
def->sd_un.str = estrdup(val);
if (def->callback)
return def->callback(val);
return TRUE;
}
static int
store_list(char *str, struct sudo_defs_types *def, int op)
{
char *start, *end;
/* Remove all old members. */
if (op == FALSE || op == TRUE)
list_op(NULL, 0, def, freeall);
/* Split str into multiple space-separated words and act on each one. */
if (op != FALSE) {
end = str;
do {
/* Remove leading blanks, if nothing but blanks we are done. */
for (start = end; isblank((unsigned char)*start); start++)
;
if (*start == '\0')
break;
/* Find end position and perform operation. */
for (end = start; *end && !isblank((unsigned char)*end); end++)
;
list_op(start, end - start, def, op == '-' ? delete : add);
} while (*end++ != '\0');
}
return TRUE;
}
static int
store_syslogfac(char *val, struct sudo_defs_types *def, int op)
{
struct strmap *fac;
if (op == FALSE) {
def->sd_un.ival = FALSE;
return TRUE;
}
#ifdef LOG_NFACILITIES
if (!val)
return FALSE;
for (fac = facilities; fac->name && strcmp(val, fac->name); fac++)
;
if (fac->name == NULL)
return FALSE; /* not found */
def->sd_un.ival = fac->num;
#else
def->sd_un.ival = -1;
#endif /* LOG_NFACILITIES */
return TRUE;
}
static const char *
logfac2str(int n)
{
#ifdef LOG_NFACILITIES
struct strmap *fac;
for (fac = facilities; fac->name && fac->num != n; fac++)
;
return fac->name;
#else
return "default";
#endif /* LOG_NFACILITIES */
}
static int
store_syslogpri(char *val, struct sudo_defs_types *def, int op)
{
struct strmap *pri;
if (op == FALSE || !val)
return FALSE;
for (pri = priorities; pri->name && strcmp(val, pri->name); pri++)
;
if (pri->name == NULL)
return FALSE; /* not found */
def->sd_un.ival = pri->num;
return TRUE;
}
static const char *
logpri2str(int n)
{
struct strmap *pri;
for (pri = priorities; pri->name && pri->num != n; pri++)
;
return pri->name;
}
static int
store_mode(char *val, struct sudo_defs_types *def, int op)
{
char *endp;
long l;
if (op == FALSE) {
def->sd_un.mode = (mode_t)0777;
} else {
l = strtol(val, &endp, 8);
if (*endp != '\0' || l < 0 || l > 0777)
return FALSE;
def->sd_un.mode = (mode_t)l;
}
if (def->callback)
return def->callback(val);
return TRUE;
}
static void
list_op(char *val, size_t len, struct sudo_defs_types *def, enum list_ops op)
{
struct list_member *cur, *prev, *tmp;
if (op == freeall) {
for (cur = def->sd_un.list; cur; ) {
tmp = cur;
cur = tmp->next;
efree(tmp->value);
efree(tmp);
}
def->sd_un.list = NULL;
return;
}
for (cur = def->sd_un.list, prev = NULL; cur; prev = cur, cur = cur->next) {
if ((strncmp(cur->value, val, len) == 0 && cur->value[len] == '\0')) {
if (op == add)
return; /* already exists */
/* Delete node */
if (prev != NULL)
prev->next = cur->next;
else
def->sd_un.list = cur->next;
efree(cur->value);
efree(cur);
break;
}
}
/* Add new node to the head of the list. */
if (op == add) {
cur = emalloc(sizeof(struct list_member));
cur->value = emalloc(len + 1);
(void) memcpy(cur->value, val, len);
cur->value[len] = '\0';
cur->next = def->sd_un.list;
def->sd_un.list = cur;
}
}
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