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
valid_login(char * login,struct passwd ** pptr,int * warning)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