xref: /illumos-gate/usr/src/cmd/pwck/pwck.c (revision 60405de4d8688d96dd05157c28db3ade5c9bc234)
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 2005 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
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"
32 
33 #include <sys/types.h>
34 #include <sys/param.h>
35 #include <sys/signal.h>
36 #include <sys/sysmacros.h>
37 #include <sys/stat.h>
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include <string.h>
41 #include <ctype.h>
42 #include <locale.h>
43 #include <errno.h>
44 #include <unistd.h>
45 
46 #define	ERROR1	"Too many/few fields"
47 #define	ERROR2	"Bad character(s) in logname"
48 #define	ERROR2a "First char in logname not alphabetic"
49 #define	ERROR2b "Logname field NULL"
50 #define	ERROR2c "Logname contains no lower-case letters"
51 #define	ERROR3	"Logname too long/short"
52 #define	ERROR4	"Invalid UID"
53 #define	ERROR5	"Invalid GID"
54 #define	ERROR6	"Login directory not found"
55 #define	ERROR6a	"Login directory null"
56 #define	ERROR7	"Optional shell file not found"
57 
58 static int eflag, code = 0;
59 static int badc;
60 static int lc;
61 static char buf[512];
62 static void error(char *);
63 
64 int
65 main(int argc, char **argv)
66 {
67 	int delim[512];
68 	char logbuf[512];
69 	FILE *fptr;
70 	struct stat obuf;
71 	uid_t uid;
72 	gid_t gid;
73 	int i, j, colons;
74 	char *pw_file;
75 	struct stat stat_buf;
76 	char *str, *lastc;
77 
78 	(void) setlocale(LC_ALL, "");
79 
80 #if !defined(TEXT_DOMAIN)	/* Should be defined by cc -D */
81 #define	TEXT_DOMAIN "SYS_TEST"
82 #endif
83 	(void) textdomain(TEXT_DOMAIN);
84 
85 	if (argc == 1)
86 		pw_file = "/etc/passwd";
87 	else
88 		pw_file = argv[1];
89 
90 	if ((fptr = fopen(pw_file, "r")) == NULL) {
91 		(void) fprintf(stderr, gettext("cannot open %s\n"), pw_file);
92 		exit(1);
93 	}
94 
95 	if (fstat(fileno(fptr), &stat_buf) < 0) {
96 		(void) fprintf(stderr, gettext("fstat failed for %s\n"),
97 		    pw_file);
98 		(void) fclose(fptr);
99 		exit(1);
100 	}
101 
102 	if (stat_buf.st_size == 0) {
103 		(void) fprintf(stderr, gettext("file %s is empty\n"), pw_file);
104 		(void) fclose(fptr);
105 		exit(1);
106 	}
107 
108 	while (fgets(buf, sizeof (buf), fptr) != NULL) {
109 
110 		colons = 0;
111 		badc = 0;
112 		lc = 0;
113 		eflag = 0;
114 
115 		/* Check that entry is not a nameservice redirection */
116 
117 		if (buf[0] == '+' || buf[0] == '-')  {
118 			/*
119 			 * Should set flag here to allow special case checking
120 			 * in the rest of the code,
121 			 * but for now, we'll just ignore this entry.
122 			 */
123 			continue;
124 		}
125 
126 		/* Check number of fields */
127 
128 		for (i = 0; buf[i] != NULL; i++)
129 			if (buf[i] == ':') {
130 				delim[colons] = i;
131 				++colons;
132 			}
133 
134 		if (colons != 6) {
135 			error(ERROR1);
136 			continue;
137 		}
138 		delim[6] = i - 1;
139 		delim[7] = NULL;
140 
141 		/*
142 		 * Check the first char is alpha; the rest alphanumeric;
143 		 * and that the name does not consist solely of uppercase
144 		 * alpha chars
145 		 */
146 		if (buf[0] == ':')
147 			error(ERROR2b);
148 		else if (!isalpha(buf[0]))
149 			error(ERROR2a);
150 
151 		for (i = 0; buf[i] != ':'; i++) {
152 			if (!isalnum(buf[i]) &&
153 				buf[i] != '_' &&
154 				buf[i] != '-' &&
155 				buf[i] != '.')
156 				badc++;
157 			else if (islower(buf[i]))
158 				lc++;
159 		}
160 		if (lc == 0)
161 			error(ERROR2c);
162 		if (badc > 0)
163 			error(ERROR2);
164 
165 		/* Check for valid number of characters in logname */
166 
167 		if (i <= 0 || i > 8)
168 			error(ERROR3);
169 
170 		/* Check that UID is numeric and <= MAXUID */
171 
172 		errno = 0;
173 		str = &buf[delim[1] + 1];
174 		uid = strtol(str, &lastc, 10);
175 		if (lastc != str + (delim[2] - delim[1]) - 1 ||
176 		    uid < 0 || uid > MAXUID || errno == ERANGE)
177 			error(ERROR4);
178 
179 		/* Check that GID is numeric and <= MAXUID */
180 
181 		errno = 0;
182 		str = &buf[delim[2] + 1];
183 		gid = strtol(str, &lastc, 10);
184 		if (lastc != str + (delim[3] - delim[2]) - 1 ||
185 		    gid < 0 || gid > MAXUID || errno == ERANGE)
186 			error(ERROR5);
187 
188 		/* Check initial working directory */
189 
190 		for (j = 0, i = (delim[4] + 1); i < delim[5]; j++, i++)
191 			logbuf[j] = buf[i];
192 		logbuf[j] = '\0';
193 
194 		if (logbuf[0] == NULL)
195 			error(ERROR6a);
196 		else if ((stat(logbuf, &obuf)) == -1)
197 			error(ERROR6);
198 
199 		/* Check program to use as shell  */
200 
201 		if ((buf[(delim[5] + 1)]) != '\n') {
202 
203 			for (j = 0, i = (delim[5] + 1); i < delim[6]; j++, i++)
204 				logbuf[j] = buf[i];
205 			logbuf[j] = '\0';
206 
207 			if (strcmp(logbuf, "*") == 0)	/* subsystem login */
208 				continue;
209 
210 			if ((stat(logbuf, &obuf)) == -1)
211 				error(ERROR7);
212 
213 			for (j = 0; j < 512; j++)
214 				logbuf[j] = NULL;
215 		}
216 	}
217 	(void) fclose(fptr);
218 	return (code);
219 }
220 
221 /* Error printing routine */
222 
223 static void
224 error(char *msg)
225 {
226 	if (!eflag) {
227 		(void) fprintf(stderr, "\n%s", buf);
228 		code = 1;
229 		++eflag;
230 	}
231 	if (!badc)
232 		(void) fprintf(stderr, "\t%s\n", gettext(msg));
233 	else {
234 		(void) fprintf(stderr, "\t%d %s\n", badc, gettext(msg));
235 		badc = 0;
236 	}
237 }
238