shadow/lib/getdef.c

424 lines
9.5 KiB
C

/*
* Copyright 1991 - 1994, Julianne Frances Haugh and Chip Rosenthal
* 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. Neither the name of Julianne F. Haugh nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY JULIE HAUGH 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 JULIE HAUGH 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>
#include "rcsid.h"
RCSID("$Id: getdef.c,v 1.18 2003/05/12 02:40:08 kloczek Exp $")
#include "prototypes.h"
#include "defines.h"
#include <stdio.h>
#include <ctype.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 */
};
/*
* This list *must* be sorted by the "name" member.
*/
#define NUMDEFS (sizeof(def_table)/sizeof(def_table[0]))
static struct itemdef def_table[] = {
{ "CHFN_AUTH", NULL },
{ "CHFN_RESTRICT", NULL },
#ifdef USE_PAM
{ "CLOSE_SESSIONS", NULL },
#endif
{ "CONSOLE", NULL },
{ "CONSOLE_GROUPS", NULL },
{ "CRACKLIB_DICTPATH", NULL },
{ "CREATE_HOME", NULL },
{ "DEFAULT_HOME", NULL },
{ "ENVIRON_FILE", NULL },
{ "ENV_HZ", NULL },
{ "ENV_PATH", NULL },
{ "ENV_ROOTPATH", NULL }, /* SuSE compatibility? */
{ "ENV_SUPATH", NULL },
{ "ENV_TZ", NULL },
{ "ERASECHAR", NULL },
{ "FAILLOG_ENAB", NULL },
{ "FAIL_DELAY", NULL },
{ "FAKE_SHELL", NULL },
{ "FTMP_FILE", NULL },
{ "GETPASS_ASTERISKS", NULL },
{ "GID_MAX", NULL },
{ "GID_MIN", NULL },
{ "HUSHLOGIN_FILE", NULL },
{ "ISSUE_FILE", NULL },
{ "KILLCHAR", NULL },
{ "LASTLOG_ENAB", NULL },
{ "LOGIN_RETRIES", NULL },
{ "LOGIN_STRING", NULL },
{ "LOGIN_TIMEOUT", NULL },
{ "LOG_OK_LOGINS", NULL },
{ "LOG_UNKFAIL_ENAB", NULL },
{ "MAIL_CHECK_ENAB", NULL },
{ "MAIL_DIR", NULL },
{ "MAIL_FILE", NULL },
{ "MD5_CRYPT_ENAB", NULL },
{ "MOTD_FILE", NULL },
{ "NOLOGINS_FILE", NULL },
{ "NOLOGIN_STR", NULL },
{ "OBSCURE_CHECKS_ENAB", NULL },
{ "PASS_ALWAYS_WARN", NULL },
{ "PASS_CHANGE_TRIES", NULL },
{ "PASS_MAX_DAYS", NULL },
{ "PASS_MAX_LEN", NULL },
{ "PASS_MIN_DAYS", NULL },
{ "PASS_MIN_LEN", NULL },
{ "PASS_WARN_AGE", NULL },
{ "PORTTIME_CHECKS_ENAB", NULL },
{ "QMAIL_DIR", NULL },
{ "QUOTAS_ENAB", NULL },
{ "SULOG_FILE", NULL },
{ "SU_NAME", NULL },
{ "SU_WHEEL_ONLY", NULL },
#ifdef USE_SYSLOG
{ "SYSLOG_SG_ENAB", NULL },
{ "SYSLOG_SU_ENAB", NULL },
#endif
{ "TTYGROUP", NULL },
{ "TTYPERM", NULL },
{ "TTYTYPE_FILE", NULL },
{ "UID_MAX", NULL },
{ "UID_MIN", NULL },
{ "ULIMIT", NULL },
{ "UMASK", NULL },
{ "USERDEL_CMD", NULL },
{ "USERGROUPS_ENAB", NULL }
};
#ifndef LOGINDEFS
#define LOGINDEFS "/etc/login.defs"
#endif
static char def_fname[] = LOGINDEFS; /* login config defs file */
static int def_loaded = 0; /* are defs already loaded? */
extern long strtol();
/* 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();
return ((d = def_find(item)) == NULL ? (char *)NULL : d->value);
}
/*
* getdef_bool - get boolean value from table of definitions.
*
* Return TRUE if specified item is defined as "yes", else FALSE.
*/
int
getdef_bool(const char *item)
{
struct itemdef *d;
if (!def_loaded)
def_load();
if ((d = def_find(item)) == NULL || d->value == NULL)
return 0;
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();
if ((d = def_find(item)) == NULL || d->value == NULL)
return dflt;
return (int) strtol(d->value, (char **)NULL, 0);
}
/*
* 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();
if ((d = def_find(item)) == NULL || d->value == NULL)
return dflt;
return (unsigned int) strtoul(d->value, (char **)NULL, 0);
}
/*
* 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();
if ((d = def_find(item)) == NULL || d->value == NULL)
return dflt;
return strtol(d->value, (char **)NULL, 0);
}
/*
* 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.
*/
if ((d = def_find(name)) == NULL)
return -1;
/*
* Save off the value.
*/
if ((cp = strdup(value)) == NULL) {
fprintf(stderr,
_("Could not allocate space for config info.\n"));
SYSLOG((LOG_ERR,
"could not allocate space for config info"));
return -1;
}
if (d->value)
free(d->value);
d->value = cp;
return 0;
}
/*
* def_find - locate named item in table
*
* Search through a sorted table of configurable items to locate the
* specified configuration option.
*/
static struct itemdef *
def_find(const char *name)
{
int min, max, curr, n;
/*
* Invariant - desired item in range [min:max].
*/
min = 0;
max = NUMDEFS-1;
/*
* Binary search into the table. Relies on the items being
* sorted by name.
*/
while (min <= max) {
curr = (min+max)/2;
if (! (n = strcmp(def_table[curr].name, name)))
return &def_table[curr];
if (n < 0)
min = curr+1;
else
max = curr-1;
}
/*
* 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.
*/
if ((fp = fopen(def_fname, "r")) == NULL) {
SYSLOG((LOG_CRIT, "cannot open login definitions %s [%m]",
def_fname));
return;
}
/*
* Set the initialized flag.
* (do it early to prevent recursion in putdef_str())
*/
++def_loaded;
/*
* Go through all of the lines in the file.
*/
while (fgets(buf, sizeof(buf), fp) != NULL) {
/*
* Trim trailing whitespace.
*/
for (i = strlen(buf)-1 ; i >= 0 ; --i) {
if (!isspace(buf[i]))
break;
}
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);
}
(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) {
if ((d = def_find(def_table[i].name)) == NULL)
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++) {
if ((cp = getdef_str (argv[1])) != NULL)
printf ("%s `%s'\n", argv[1], cp);
else
printf ("%s not found\n", argv[1]);
}
exit(0);
}
#endif