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) 1997, by Sun Microsystems, Inc.
  24  * All rights reserved.
  25  */
  26 
  27 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T     */
  28 /*        All Rights Reserved   */
  29 
  30 
  31 #pragma ident   "%Z%%M% %I%     %E% SMI"        /* SVr4.0 1.3 */
  32 
  33 /*LINTLIBRARY*/
  34 
  35 #include        <sys/types.h>
  36 #include        <stdio.h>
  37 #include        <ctype.h>
  38 #include        <userdefs.h>
  39 #include        <users.h>
  40 #include        <limits.h>
  41 
  42 /*
  43  * validate string given as login name.
  44  */
  45 int
  46 valid_login(char *login, struct passwd **pptr, int *warning)
  47 {
  48         struct passwd *t_pptr;
  49         char *ptr = login;
  50         int bad1char, badc, clower, len;
  51         char c;
  52 
  53         len = 0; clower = 0; badc = 0; bad1char = 0;
  54         *warning = 0;
  55         if (!login || !*login)
  56                 return (INVALID);
  57 
  58         c = *ptr;
  59         if (!isalpha(c))
  60                 bad1char++;
  61         for (; c != NULL; ptr++, c = *ptr) {
  62                 len++;
  63                 if (!isprint(c) || (c == ':') || (c == '\n'))
  64                         return (INVALID);
  65                 if (!isalnum(c) && c != '_' && c != '-' && c != '.')
  66                         badc++;
  67                 if (islower(c))
  68                         clower++;
  69         }
  70 
  71         /*
  72          * XXX length checking causes some operational/compatibility problem.
  73          * This has to be revisited in the future as ARC/standards issue.
  74          */
  75         if (len > LOGNAME_MAX)
  76                 *warning = *warning | WARN_NAME_TOO_LONG;
  77         if (clower == 0)
  78                 *warning = *warning | WARN_NO_LOWERCHAR;
  79         if (badc != 0)
  80                 *warning = *warning | WARN_BAD_LOGNAME_CHAR;
  81         if (bad1char != 0)
  82                 *warning = *warning | WARN_BAD_LOGNAME_FIRST;
  83 
  84         if ((t_pptr = getpwnam(login)) != NULL) {
  85                 if (pptr) *pptr = t_pptr;
  86                 return (NOTUNIQUE);
  87         }
  88         return (UNIQUE);
  89 }