shadow/lib/getdef.c

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/*
* Copyright (c) 1991 - 1994, Julianne Frances Haugh
* Copyright (c) 1996 - 2000, Marek Michałkiewicz
* Copyright (c) 2002 - 2006, Tomasz Kłoczko
* Copyright (c) 2007 - 2008, Nicolas François
* 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 copyright holders or contributors may not be used to
* endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``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 COPYRIGHT
* HOLDERS OR CONTRIBUTORS 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>
#ident "$Id$"
#include "prototypes.h"
#include "defines.h"
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <errno.h>
#include "getdef.h"
/*
* A configuration item definition.
*/
struct itemdef {
const char *name; /* name of the item */
char *value; /* value given, or NULL if no value */
};
#define NUMDEFS (sizeof(def_table)/sizeof(def_table[0]))
static struct itemdef def_table[] = {
{"CHFN_RESTRICT", NULL},
{"CONSOLE_GROUPS", NULL},
{"CONSOLE", NULL},
{"CREATE_HOME", NULL},
{"DEFAULT_HOME", NULL},
{"ENCRYPT_METHOD", NULL},
{"ENV_PATH", NULL},
{"ENV_SUPATH", NULL},
{"ERASECHAR", NULL},
{"FAIL_DELAY", NULL},
{"FAKE_SHELL", NULL},
{"GID_MAX", NULL},
{"GID_MIN", NULL},
{"HUSHLOGIN_FILE", NULL},
{"KILLCHAR", NULL},
{"LOGIN_RETRIES", NULL},
{"LOGIN_TIMEOUT", NULL},
{"LOG_OK_LOGINS", NULL},
{"LOG_UNKFAIL_ENAB", NULL},
{"MAIL_DIR", NULL},
{"MAIL_FILE", NULL},
{"MAX_MEMBERS_PER_GROUP", NULL},
{"MD5_CRYPT_ENAB", NULL},
{"PASS_MAX_DAYS", NULL},
{"PASS_MIN_DAYS", NULL},
{"PASS_WARN_AGE", NULL},
#ifdef USE_SHA_CRYPT
{"SHA_CRYPT_MAX_ROUNDS", NULL},
{"SHA_CRYPT_MIN_ROUNDS", NULL},
#endif
{"SULOG_FILE", NULL},
{"SU_NAME", NULL},
{"SYS_GID_MAX", NULL},
{"SYS_GID_MIN", NULL},
{"SYS_UID_MAX", NULL},
{"SYS_UID_MIN", NULL},
{"TTYGROUP", NULL},
{"TTYPERM", NULL},
{"TTYTYPE_FILE", NULL},
{"UID_MAX", NULL},
{"UID_MIN", NULL},
{"UMASK", NULL},
{"USERDEL_CMD", NULL},
{"USERGROUPS_ENAB", NULL},
#ifndef USE_PAM
{"CHFN_AUTH", NULL},
{"CHSH_AUTH", NULL},
{"CRACKLIB_DICTPATH", NULL},
{"ENV_HZ", NULL},
{"ENVIRON_FILE", NULL},
{"ENV_TZ", NULL},
{"FAILLOG_ENAB", NULL},
{"FTMP_FILE", NULL},
{"ISSUE_FILE", NULL},
{"LASTLOG_ENAB", NULL},
{"LOGIN_STRING", NULL},
{"MAIL_CHECK_ENAB", NULL},
{"MOTD_FILE", NULL},
{"NOLOGINS_FILE", NULL},
{"OBSCURE_CHECKS_ENAB", NULL},
{"PASS_ALWAYS_WARN", NULL},
{"PASS_CHANGE_TRIES", NULL},
{"PASS_MAX_LEN", NULL},
{"PASS_MIN_LEN", NULL},
{"PORTTIME_CHECKS_ENAB", NULL},
{"QUOTAS_ENAB", NULL},
{"SU_WHEEL_ONLY", NULL},
{"ULIMIT", NULL},
#endif
#ifdef USE_SYSLOG
{"SYSLOG_SG_ENAB", NULL},
{"SYSLOG_SU_ENAB", NULL},
#endif
{NULL, NULL}
};
#ifndef LOGINDEFS
#define LOGINDEFS "/etc/login.defs"
#endif
static char def_fname[] = LOGINDEFS; /* login config defs file */
static bool def_loaded = false; /* are defs already loaded? */
/* local function prototypes */
static struct itemdef *def_find (const char *);
static void def_load (void);
/*
* getdef_str - get string value from table of definitions.
*
* Return point to static data for specified item, or NULL if item is not
* defined. First time invoked, will load definitions from the file.
*/
char *getdef_str (const char *item)
{
struct itemdef *d;
if (!def_loaded) {
def_load ();
}
d = def_find (item);
return ((NULL == d)? (char *) NULL : d->value);
}
/*
* getdef_bool - get boolean value from table of definitions.
*
* Return TRUE if specified item is defined as "yes", else FALSE.
*/
bool getdef_bool (const char *item)
{
struct itemdef *d;
if (!def_loaded) {
def_load ();
}
d = def_find (item);
if ((NULL == d) || (NULL == d->value)) {
return false;
}
return (strcasecmp (d->value, "yes") == 0);
}
/*
* getdef_num - get numerical value from table of definitions
*
* Returns numeric value of specified item, else the "dflt" value if
* the item is not defined. Octal (leading "0") and hex (leading "0x")
* values are handled.
*/
int getdef_num (const char *item, int dflt)
{
struct itemdef *d;
if (!def_loaded) {
def_load ();
}
d = def_find (item);
if ((NULL == d) || (NULL == d->value)) {
return dflt;
}
return (int) strtol (d->value, (char **) NULL, 0);
/* TODO: check for errors */
}
/*
* getdef_unum - get unsigned numerical value from table of definitions
*
* Returns numeric value of specified item, else the "dflt" value if
* the item is not defined. Octal (leading "0") and hex (leading "0x")
* values are handled.
*/
unsigned int getdef_unum (const char *item, unsigned int dflt)
{
struct itemdef *d;
if (!def_loaded) {
def_load ();
}
d = def_find (item);
if ((NULL == d) || (NULL == d->value)) {
return dflt;
}
return (unsigned int) strtoul (d->value, (char **) NULL, 0);
/* TODO: check for errors */
}
/*
* getdef_long - get long integer value from table of definitions
*
* Returns numeric value of specified item, else the "dflt" value if
* the item is not defined. Octal (leading "0") and hex (leading "0x")
* values are handled.
*/
long getdef_long (const char *item, long dflt)
{
struct itemdef *d;
if (!def_loaded) {
def_load ();
}
d = def_find (item);
if ((NULL == d) || (NULL == d->value)) {
return dflt;
}
return strtol (d->value, (char **) NULL, 0);
/* TODO: check for errors */
}
/*
* getdef_ulong - get unsigned long numerical value from table of definitions
*
* Returns numeric value of specified item, else the "dflt" value if
* the item is not defined. Octal (leading "0") and hex (leading "0x")
* values are handled.
*/
unsigned long getdef_ulong (const char *item, unsigned long dflt)
{
struct itemdef *d;
if (!def_loaded) {
def_load ();
}
d = def_find (item);
if ((NULL == d) || (NULL == d->value)) {
return dflt;
}
return (unsigned long) strtoul (d->value, (char **) NULL, 0);
/* TODO: check for errors */
}
/*
* putdef_str - override the value read from /etc/login.defs
* (also used when loading the initial defaults)
*/
int putdef_str (const char *name, const char *value)
{
struct itemdef *d;
char *cp;
if (!def_loaded) {
def_load ();
}
/*
* Locate the slot to save the value. If this parameter
* is unknown then "def_find" will print an err message.
*/
d = def_find (name);
if (NULL == d) {
return -1;
}
/*
* Save off the value.
*/
cp = strdup (value);
if (NULL == cp) {
fputs (_("Could not allocate space for config info.\n"),
stderr);
SYSLOG ((LOG_ERR, "could not allocate space for config info"));
return -1;
}
if (NULL != d->value) {
free (d->value);
}
d->value = cp;
return 0;
}
/*
* def_find - locate named item in table
*
* Search through a table of configurable items to locate the
* specified configuration option.
*/
static struct itemdef *def_find (const char *name)
{
struct itemdef *ptr;
/*
* Search into the table.
*/
for (ptr = def_table; NULL != ptr->name; ptr++) {
if (strcmp (ptr->name, name) == 0) {
return ptr;
}
}
/*
* Item was never found.
*/
fprintf (stderr,
_
("configuration error - unknown item '%s' (notify administrator)\n"),
name);
SYSLOG ((LOG_CRIT, "unknown configuration item `%s'", name));
return (struct itemdef *) NULL;
}
/*
* def_load - load configuration table
*
* Loads the user-configured options from the default configuration file
*/
static void def_load (void)
{
int i;
FILE *fp;
char buf[1024], *name, *value, *s;
/*
* Open the configuration definitions file.
*/
fp = fopen (def_fname, "r");
if (NULL == fp) {
int err = errno;
SYSLOG ((LOG_CRIT, "cannot open login definitions %s [%s]",
def_fname, strerror (err)));
exit (1);
}
/*
* Set the initialized flag.
* (do it early to prevent recursion in putdef_str())
*/
def_loaded = true;
/*
* Go through all of the lines in the file.
*/
while (fgets (buf, (int) sizeof (buf), fp) != NULL) {
/*
* Trim trailing whitespace.
*/
for (i = (int) strlen (buf) - 1; i >= 0; --i) {
if (!isspace (buf[i])) {
break;
}
}
i++;
buf[i] = '\0';
/*
* Break the line into two fields.
*/
name = buf + strspn (buf, " \t"); /* first nonwhite */
if (*name == '\0' || *name == '#')
continue; /* comment or empty */
s = name + strcspn (name, " \t"); /* end of field */
if (*s == '\0')
continue; /* only 1 field?? */
*s++ = '\0';
value = s + strspn (s, " \"\t"); /* next nonwhite */
*(value + strcspn (value, "\"")) = '\0';
/*
* Store the value in def_table.
*/
putdef_str (name, value);
}
if (ferror (fp) != 0) {
int err = errno;
SYSLOG ((LOG_CRIT, "cannot read login definitions %s [%s]",
def_fname, strerror (err)));
exit (1);
}
(void) fclose (fp);
}
#ifdef CKDEFS
int main (int argc, char **argv)
{
int i;
char *cp;
struct itemdef *d;
def_load ();
for (i = 0; i < NUMDEFS; ++i) {
d = def_find (def_table[i].name);
if (NULL == d) {
printf ("error - lookup '%s' failed\n",
def_table[i].name);
} else {
printf ("%4d %-24s %s\n", i + 1, d->name, d->value);
}
}
for (i = 1; i < argc; i++) {
cp = getdef_str (argv[1]);
if (NULL != cp) {
printf ("%s `%s'\n", argv[1], cp);
} else {
printf ("%s not found\n", argv[1]);
}
}
exit (0);
}
#endif