1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2013 Gary Mills
  24  *
  25  * Copyright (c) 1997, by Sun Microsystems, Inc.
  26  * All rights reserved.
  27  */
  28 
  29 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T     */
  30 /*        All Rights Reserved   */
  31 
  32 /*LINTLIBRARY*/
  33 
  34 #include        <sys/types.h>
  35 #include        <stdio.h>
  36 #include        <ctype.h>
  37 #include        <userdefs.h>
  38 #include        <users.h>
  39 #include        <limits.h>
  40 
  41 /*
  42  * validate string given as login name.
  43  */
  44 int
  45 valid_login(char *login, struct passwd **pptr, int *warning)
  46 {
  47         struct passwd *t_pptr;
  48         char *ptr = login;
  49         int bad1char, badc, clower, len;
  50         char c;
  51 
  52         len = 0; clower = 0; badc = 0; bad1char = 0;
  53         *warning = 0;
  54         if (!login || !*login)
  55                 return (INVALID);
  56 
  57         c = *ptr;
  58         if (!isalpha(c))
  59                 bad1char++;
  60         for (; c != NULL; ptr++, c = *ptr) {
  61                 len++;
  62                 if (!isprint(c) || (c == ':') || (c == '\n'))
  63                         return (INVALID);
  64                 if (!isalnum(c) && c != '_' && c != '-' && c != '.')
  65                         badc++;
  66                 if (islower(c))
  67                         clower++;
  68         }
  69 
  70 #ifdef  LOGNAME_MAX_ILLUMOS
  71         if (len > LOGNAME_MAX_ILLUMOS)
  72                 return (LONGNAME);
  73 #endif /* LOGNAME_MAX_ILLUMOS */
  74 
  75         if (clower == 0)
  76                 *warning = *warning | WARN_NO_LOWERCHAR;
  77         if (badc != 0)
  78                 *warning = *warning | WARN_BAD_LOGNAME_CHAR;
  79         if (bad1char != 0)
  80                 *warning = *warning | WARN_BAD_LOGNAME_FIRST;
  81 
  82         if ((t_pptr = getpwnam(login)) != NULL) {
  83                 if (pptr) *pptr = t_pptr;
  84                 return (NOTUNIQUE);
  85         }
  86         return (UNIQUE);
  87 }