pw_scan.c revision 2916 
1/*-
2 * Copyright (c) 1990, 1993, 1994
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35static char sccsid[] = "@(#)pw_scan.c	8.3 (Berkeley) 4/2/94";
36#endif /* not lint */
37
38/*
39 * This module is used to "verify" password entries by chpass(1) and
40 * pwd_mkdb(8).
41 */
42
43#include <sys/param.h>
44
45#include <err.h>
46#include <fcntl.h>
47#include <pwd.h>
48#include <errno.h>
49#include <stdio.h>
50#include <string.h>
51#include <stdlib.h>
52#include <unistd.h>
53
54#include "pw_scan.h"
55
56int
57pw_scan(bp, pw)
58	char *bp;
59	struct passwd *pw;
60{
61	long id;
62	int root;
63	char *p, *sh;
64
65	pw->pw_fields = 0;
66	if (!(pw->pw_name = strsep(&bp, ":")))		/* login */
67		goto fmt;
68	root = !strcmp(pw->pw_name, "root");
69	if(pw->pw_name[0] && (pw->pw_name[0] != '+' || pw->pw_name[1] == '\0'))
70		pw->pw_fields |= _PWF_NAME;
71
72	if (!(pw->pw_passwd = strsep(&bp, ":")))	/* passwd */
73		goto fmt;
74	if(pw->pw_passwd[0]) pw->pw_fields |= _PWF_PASSWD;
75
76	if (!(p = strsep(&bp, ":")))			/* uid */
77		goto fmt;
78	if(p[0]) pw->pw_fields |= _PWF_UID;
79	id = atol(p);
80	if (root && id) {
81		warnx("root uid should be 0");
82		return (0);
83	}
84	if (id > USHRT_MAX) {
85		warnx("%s > max uid value (%d)", p, USHRT_MAX);
86		return (0);
87	}
88	pw->pw_uid = id;
89
90	if (!(p = strsep(&bp, ":")))			/* gid */
91		goto fmt;
92	if(p[0]) pw->pw_fields |= _PWF_GID;
93	id = atol(p);
94	if (id > USHRT_MAX) {
95		warnx("%s > max gid value (%d)", p, USHRT_MAX);
96		return (0);
97	}
98	pw->pw_gid = id;
99
100	pw->pw_class = strsep(&bp, ":");		/* class */
101	if(pw->pw_class[0]) pw->pw_fields |= _PWF_CLASS;
102
103	if (!(p = strsep(&bp, ":")))			/* change */
104		goto fmt;
105	if(p[0]) pw->pw_fields |= _PWF_CHANGE;
106	pw->pw_change = atol(p);
107
108	if (!(p = strsep(&bp, ":")))			/* expire */
109		goto fmt;
110	if(p[0]) pw->pw_fields |= _PWF_EXPIRE;
111	pw->pw_expire = atol(p);
112
113	pw->pw_gecos = strsep(&bp, ":");		/* gecos */
114	if(pw->pw_gecos[0]) pw->pw_fields |= _PWF_GECOS;
115
116	pw->pw_dir = strsep(&bp, ":");			/* directory */
117	if(pw->pw_dir[0]) pw->pw_fields |= _PWF_DIR;
118
119	if (!(pw->pw_shell = strsep(&bp, ":")))		/* shell */
120		goto fmt;
121
122	p = pw->pw_shell;
123	if (root && *p)					/* empty == /bin/sh */
124		for (setusershell();;) {
125			if (!(sh = getusershell())) {
126				warnx("warning, unknown root shell");
127				break;
128			}
129			if (!strcmp(p, sh))
130				break;
131		}
132	if(p[0]) pw->pw_fields |= _PWF_SHELL;
133
134	if (p = strsep(&bp, ":")) {			/* too many */
135fmt:		warnx("corrupted entry");
136		return (0);
137	}
138	return (1);
139}
140