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sudo/defaults.c

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/*
* Copyright (c) 1999-2000 Todd C. Miller <Todd.Miller@courtesan.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* 4. Products derived from this software may not be called "Sudo" nor
* may "Sudo" appear in their names without specific prior written
* permission from the author.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include <stdio.h>
#ifdef STDC_HEADERS
#include <stdlib.h>
#endif /* STDC_HEADERS */
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif /* HAVE_UNISTD_H */
#ifdef HAVE_STRING_H
#include <string.h>
#endif /* HAVE_STRING_H */
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif /* HAVE_STRINGS_H */
#include <sys/types.h>
#include <sys/param.h>
#include "sudo.h"
#ifndef lint
static const char rcsid[] = "$Sudo$";
#endif /* lint */
/*
* 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 }
};
extern int sudolineno;
/*
* Local prototypes.
*/
static int store_int __P((char *, struct sudo_defs_types *, int));
static int store_str __P((char *, struct sudo_defs_types *, int));
static int store_syslogfac __P((char *, struct sudo_defs_types *, int));
static int store_syslogpri __P((char *, struct sudo_defs_types *, int));
static int store_mode __P((char *, struct sudo_defs_types *, int));
static int store_pwflag __P((char *, struct sudo_defs_types *, int));
/*
* Table describing compile-time and run-time options.
*/
#include "def_data.c"
/*
* Print version and configure info.
*/
void
dump_defaults()
{
struct sudo_defs_types *cur;
for (cur = sudo_defs_table; cur->name; cur++) {
if (cur->desc) {
switch (cur->type & T_MASK) {
case T_FLAG:
if (cur->sd_un.flag)
puts(cur->desc);
break;
case T_STR:
case T_LOGFAC:
case T_LOGPRI:
case T_PWFLAG:
if (cur->sd_un.str) {
(void) printf(cur->desc, cur->sd_un.str);
putchar('\n');
}
break;
case T_INT:
(void) printf(cur->desc, cur->sd_un.ival);
putchar('\n');
break;
case T_MODE:
(void) printf(cur->desc, cur->sd_un.mode);
putchar('\n');
break;
}
}
}
}
/*
* List each option along with its description.
*/
void
list_options()
{
struct sudo_defs_types *cur;
char *p;
(void) puts("Available options in a sudoers ``Defaults'' line:\n");
for (cur = sudo_defs_table; cur->name; cur++) {
if (cur->name && cur->desc) {
switch (cur->type & T_MASK) {
case T_FLAG:
(void) printf("%s: %s\n", cur->name, cur->desc);
break;
default:
p = strrchr(cur->desc, ':');
if (p)
(void) printf("%s: %.*s\n", cur->name,
(int) (p - cur->desc), cur->desc);
else
(void) printf("%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(var, val, op)
char *var;
char *val;
int op; /* TRUE or FALSE */
{
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) {
(void) fprintf(stderr,
"%s: unknown defaults entry `%s' referenced near line %d\n", Argv[0],
var, sudolineno);
return(FALSE);
}
switch (cur->type & T_MASK) {
case T_LOGFAC:
if (!store_syslogfac(val, cur, op)) {
if (val)
(void) fprintf(stderr,
"%s: value '%s' is invalid for option '%s'\n", Argv[0],
val, var);
else
(void) fprintf(stderr,
"%s: no value specified for `%s' on line %d\n", Argv[0],
var, sudolineno);
return(FALSE);
}
break;
case T_LOGPRI:
if (!store_syslogpri(val, cur, op)) {
if (val)
(void) fprintf(stderr,
"%s: value '%s' is invalid for option '%s'\n", Argv[0],
val, var);
else
(void) fprintf(stderr,
"%s: no value specified for `%s' on line %d\n", Argv[0],
var, sudolineno);
return(FALSE);
}
break;
case T_PWFLAG:
if (!store_pwflag(val, cur, op)) {
if (val)
(void) fprintf(stderr,
"%s: value '%s' is invalid for option '%s'\n", Argv[0],
val, var);
else
(void) fprintf(stderr,
"%s: no value specified for `%s' on line %d\n", Argv[0],
var, sudolineno);
return(FALSE);
}
break;
case T_STR:
if (!val) {
/* Check for bogus boolean usage or lack of a value. */
if (!(cur->type & T_BOOL) || op != FALSE) {
(void) fprintf(stderr,
"%s: no value specified for `%s' on line %d\n", Argv[0],
var, sudolineno);
return(FALSE);
}
}
if ((cur->type & T_PATH) && val && *val != '/') {
(void) fprintf(stderr,
"%s: values for `%s' must start with a '/'\n", Argv[0],
var);
return(FALSE);
}
if (!store_str(val, cur, op)) {
(void) fprintf(stderr,
"%s: value '%s' is invalid for option '%s'\n", Argv[0],
val, var);
return(FALSE);
}
break;
case T_INT:
if (!val) {
/* Check for bogus boolean usage or lack of a value. */
if (!(cur->type & T_BOOL) || op != FALSE) {
(void) fprintf(stderr,
"%s: no value specified for `%s' on line %d\n", Argv[0],
var, sudolineno);
return(FALSE);
}
}
if (!store_int(val, cur, op)) {
(void) fprintf(stderr,
"%s: value '%s' is invalid for option '%s'\n", Argv[0],
val, var);
return(FALSE);
}
break;
case T_MODE:
if (!val) {
/* Check for bogus boolean usage or lack of a value. */
if (!(cur->type & T_BOOL) || op != FALSE) {
(void) fprintf(stderr,
"%s: no value specified for `%s' on line %d\n", Argv[0],
var, sudolineno);
return(FALSE);
}
}
if (!store_mode(val, cur, op)) {
(void) fprintf(stderr,
"%s: value '%s' is invalid for option '%s'\n", Argv[0],
val, var);
return(FALSE);
}
break;
case T_FLAG:
if (val) {
(void) fprintf(stderr,
"%s: option `%s' does not take a value on line %d\n",
Argv[0], var, sudolineno);
return(FALSE);
}
cur->sd_un.flag = op;
/* Special action for I_FQDN. Move to own switch if we get more */
if (num == I_FQDN && op)
set_fqdn();
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()
{
static int firsttime = 1;
struct sudo_defs_types *def;
/* Free any strings that were set. */
if (!firsttime) {
for (def = sudo_defs_table; def->name; def++)
switch (def->type & T_MASK) {
case T_STR:
case T_LOGFAC:
case T_LOGPRI:
case T_PWFLAG:
if (def->sd_un.str) {
free(def->sd_un.str);
def->sd_un.str = NULL;
}
break;
}
}
/* First initialize the flags. */
#ifdef LONG_OTP_PROMPT
def_flag(I_LONG_OTP_PROMPT) = TRUE;
#endif
#ifdef IGNORE_DOT_PATH
def_flag(I_IGNORE_DOT) = TRUE;
#endif
#ifdef ALWAYS_SEND_MAIL
def_flag(I_MAIL_ALWAYS) = TRUE;
#endif
#ifdef SEND_MAIL_WHEN_NO_USER
def_flag(I_MAIL_NO_USER) = TRUE;
#endif
#ifdef SEND_MAIL_WHEN_NO_HOST
def_flag(I_MAIL_NO_HOST) = TRUE;
#endif
#ifdef SEND_MAIL_WHEN_NOT_OK
def_flag(I_MAIL_NO_PERMS) = TRUE;
#endif
#ifdef USE_TTY_TICKETS
def_flag(I_TTY_TICKETS) = TRUE;
#endif
#ifndef NO_LECTURE
def_flag(I_LECTURE) = TRUE;
#endif
#ifndef NO_AUTHENTICATION
def_flag(I_AUTHENTICATE) = TRUE;
#endif
#ifndef NO_ROOT_SUDO
def_flag(I_ROOT_SUDO) = TRUE;
#endif
#ifdef HOST_IN_LOG
def_flag(I_LOG_HOST) = TRUE;
#endif
#ifdef SHELL_IF_NO_ARGS
def_flag(I_SHELL_NOARGS) = TRUE;
#endif
#ifdef SHELL_SETS_HOME
def_flag(I_SET_HOME) = TRUE;
#endif
#ifndef DONT_LEAK_PATH_INFO
def_flag(I_PATH_INFO) = TRUE;
#endif
#ifdef FQDN
def_flag(I_FQDN) = TRUE;
#endif
#ifdef USE_INSULTS
def_flag(I_INSULTS) = TRUE;
#endif
#ifdef ENV_EDITOR
def_flag(I_ENV_EDITOR) = TRUE;
#endif
def_flag(I_SET_LOGNAME) = 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], 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_pwflag("any", &sudo_defs_table[I_LISTPW], TRUE);
(void) store_pwflag("all", &sudo_defs_table[I_VERIFYPW], TRUE);
/* Then initialize the int-like things. */
#ifdef SUDO_UMASK
def_mode(I_UMASK) = SUDO_UMASK;
#else
def_mode(I_UMASK) = 0777;
#endif
def_ival(I_LOGLINELEN) = MAXLOGFILELEN;
def_ival(I_TIMESTAMP_TIMEOUT) = TIMEOUT;
def_ival(I_PASSWD_TIMEOUT) = PASSWORD_TIMEOUT;
def_ival(I_PASSWD_TRIES) = TRIES_FOR_PASSWORD;
/* Finally do the strings */
def_str(I_MAILTO) = estrdup(MAILTO);
def_str(I_MAILSUB) = estrdup(MAILSUBJECT);
def_str(I_BADPASS_MESSAGE) = estrdup(INCORRECT_PASSWORD);
def_str(I_TIMESTAMPDIR) = estrdup(_PATH_SUDO_TIMEDIR);
def_str(I_PASSPROMPT) = estrdup(PASSPROMPT);
def_str(I_RUNAS_DEFAULT) = estrdup(RUNAS_DEFAULT);
#ifdef _PATH_SENDMAIL
def_str(I_MAILERPATH) = estrdup(_PATH_SENDMAIL);
def_str(I_MAILERFLAGS) = estrdup("-t");
#endif
#if (LOGGING & SLOG_FILE)
def_str(I_LOGFILE) = estrdup(_PATH_SUDO_LOGFILE);
#endif
#ifdef EXEMPTGROUP
def_str(I_EXEMPT_GROUP) = estrdup(EXEMPTGROUP);
#endif
#ifdef SECURE_PATH
def_str(I_SECURE_PATH) = estrdup(SECURE_PATH);
#endif
def_str(I_EDITOR) = estrdup(EDITOR);
/*
* The following depend on the above values.
* We use a pointer to the string so that if its
* value changes we get the change.
*/
if (user_runas == NULL)
user_runas = &def_str(I_RUNAS_DEFAULT);
firsttime = 0;
}
static int
store_int(val, def, op)
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;
}
return(TRUE);
}
static int
store_str(val, def, op)
char *val;
struct sudo_defs_types *def;
int op;
{
if (def->sd_un.str)
free(def->sd_un.str);
if (op == FALSE)
def->sd_un.str = NULL;
else
def->sd_un.str = estrdup(val);
return(TRUE);
}
static int
store_syslogfac(val, def, op)
char *val;
struct sudo_defs_types *def;
int op;
{
struct strmap *fac;
if (op == FALSE) {
if (def->sd_un.str) {
free(def->sd_un.str);
def->sd_un.str = NULL;
}
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 */
/* Store both name and number. */
if (def->sd_un.str)
free(def->sd_un.str);
def->sd_un.str = estrdup(fac->name);
sudo_defs_table[I_LOGFAC].sd_un.ival = fac->num;
#else
if (def->sd_un.str)
free(def->sd_un.str);
def->sd_un.str = estrdup("default");
#endif /* LOG_NFACILITIES */
return(TRUE);
}
static int
store_syslogpri(val, def, op)
char *val;
struct sudo_defs_types *def;
int op;
{
struct strmap *pri;
struct sudo_defs_types *idef;
if (op == FALSE || !val)
return(FALSE);
if (def == &sudo_defs_table[I_SYSLOG_GOODPRI])
idef = &sudo_defs_table[I_GOODPRI];
else if (def == &sudo_defs_table[I_SYSLOG_BADPRI])
idef = &sudo_defs_table[I_BADPRI];
else
return(FALSE);
for (pri = priorities; pri->name && strcmp(val, pri->name); pri++)
;
if (pri->name == NULL)
return(FALSE); /* not found */
/* Store both name and number. */
if (def->sd_un.str)
free(def->sd_un.str);
def->sd_un.str = estrdup(pri->name);
idef->sd_un.ival = pri->num;
return(TRUE);
}
static int
store_mode(val, def, op)
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;
}
return(TRUE);
}
static int
store_pwflag(val, def, op)
char *val;
struct sudo_defs_types *def;
int op;
{
int isub, flags;
if (strcmp(def->name, "verifypw") == 0)
isub = I_VERIFYPW_I;
else
isub = I_LISTPW_I;
/* Handle !foo. */
if (op == FALSE) {
if (def->sd_un.str) {
free(def->sd_un.str);
def->sd_un.str = NULL;
}
def->sd_un.str = estrdup("never");
sudo_defs_table[isub].sd_un.ival = PWCHECK_NEVER;
return(TRUE);
}
if (!val)
return(FALSE);
/* Convert strings to integer values. */
if (strcmp(val, "all") == 0)
flags = PWCHECK_ALL;
else if (strcmp(val, "any") == 0)
flags = PWCHECK_ANY;
else if (strcmp(val, "never") == 0)
flags = PWCHECK_NEVER;
else if (strcmp(val, "always") == 0)
flags = PWCHECK_ALWAYS;
else
return(FALSE);
/* Store both name and number. */
if (def->sd_un.str)
free(def->sd_un.str);
def->sd_un.str = estrdup(val);
sudo_defs_table[isub].sd_un.ival = flags;
return(TRUE);
}
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