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 <deflt.h> 40 #include <limits.h> 41 42 /* Defaults file */ 43 #define DEFAULT_USERADD "/etc/default/useradd" 44 45 /* 46 * validate string given as login name. 47 */ 48 int 49 valid_login(char *login, struct passwd **pptr, int *warning) 50 { 51 struct passwd *t_pptr; 52 char *ptr = login; 53 int bad1char, badc, clower, len; 54 char c; 55 char action; 56 57 len = 0; clower = 0; badc = 0; bad1char = 0; 58 *warning = 0; 59 if (!login || !*login) 60 return (INVALID); 61 62 c = *ptr; 63 if (!isalpha(c)) 64 bad1char++; 65 for (; c != NULL; ptr++, c = *ptr) { 66 len++; 67 if (!isprint(c) || (c == ':') || (c == '\n')) 68 return (INVALID); 69 if (!isalnum(c) && c != '_' && c != '-' && c != '.') 70 badc++; 71 if (islower(c)) 72 clower++; 73 } 74 75 action = 'w'; 76 if (defopen(DEFAULT_USERADD) == 0) { 77 char *defptr; 78 79 if ((defptr = defread("EXCEED_TRAD=")) != NULL) { 80 char let = tolower(*defptr); 81 82 switch (let) { 83 case 'w': /* warning */ 84 case 'e': /* error */ 85 case 's': /* silent */ 86 action = let; 87 break; 88 } 89 } 90 (void) defopen((char *)NULL); 91 } 92 93 if (len > LOGNAME_MAX) 94 return (LONGNAME); 95 96 if (len > LOGNAME_MAX_TRAD) { 97 if (action == 'w') 98 *warning = *warning | WARN_NAME_TOO_LONG; 99 else if (action == 'e') 100 return (LONGNAME); 101 } 102 103 if (clower == 0) 104 *warning = *warning | WARN_NO_LOWERCHAR; 105 if (badc != 0) 106 *warning = *warning | WARN_BAD_LOGNAME_CHAR; 107 if (bad1char != 0) 108 *warning = *warning | WARN_BAD_LOGNAME_FIRST; 109 110 if ((t_pptr = getpwnam(login)) != NULL) { 111 if (pptr) *pptr = t_pptr; 112 return (NOTUNIQUE); 113 } 114 return (UNIQUE); 115 } 116