shadow/libmisc/chkname.c

66 lines
1.2 KiB
C

/*
* check_user_name(), check_group_name() - check the new user/group
* name for validity; return value: 1 - OK, 0 - bad name
*/
#include <config.h>
#ident "$Id$"
#include <ctype.h>
#include "defines.h"
#include "chkname.h"
#if HAVE_UTMPX_H
#include <utmpx.h>
#else
#include <utmp.h>
#endif
static int good_name (const char *name)
{
/*
* User/group names must match [a-z_][a-z0-9_-]*[$]
*/
if (!*name || !((*name >= 'a' && *name <= 'z') || *name == '_'))
return 0;
while (*++name) {
if (!((*name >= 'a' && *name <= 'z') ||
(*name >= '0' && *name <= '9') ||
*name == '_' || *name == '-' ||
(*name == '$' && *(name + 1) == '\0')))
return 0;
}
return 1;
}
int check_user_name (const char *name)
{
#if HAVE_UTMPX_H
struct utmpx ut;
#else
struct utmp ut;
#endif
/*
* User names are limited by whatever utmp can
* handle (usually max 8 characters).
*/
if (strlen (name) > sizeof (ut.ut_user))
return 0;
return good_name (name);
}
int check_group_name (const char *name)
{
/*
* Arbitrary limit for group names - max 16
* characters (same as on HP-UX 10).
*/
if (strlen (name) > 16)
return 0;
return good_name (name);
}