Annotation of src/usr.bin/passwd/local_passwd.c, Revision 1.1.1.1
1.1 deraadt 1: /*-
2: * Copyright (c) 1990 The Regents of the University of California.
3: * 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
35: /*static char sccsid[] = "from: @(#)local_passwd.c 5.5 (Berkeley) 5/6/91";*/
36: static char rcsid[] = "$Id: local_passwd.c,v 1.7 1994/12/24 17:27:42 cgd Exp $";
37: #endif /* not lint */
38:
39: #include <sys/types.h>
40: #include <pwd.h>
41: #include <errno.h>
42: #include <stdio.h>
43: #include <string.h>
44:
45: uid_t uid;
46:
47: char *progname = "passwd";
48: char *tempname;
49:
50: local_passwd(uname)
51: char *uname;
52: {
53: struct passwd *pw;
54: int pfd, tfd;
55: char *getnewpasswd();
56:
57: if (!(pw = getpwnam(uname))) {
58: #ifdef YP
59: extern int use_yp;
60: if (!use_yp)
61: #endif
62: (void)fprintf(stderr, "passwd: unknown user %s.\n", uname);
63: return(1);
64: }
65:
66: uid = getuid();
67: if (uid && uid != pw->pw_uid) {
68: (void)fprintf(stderr, "passwd: %s\n", strerror(EACCES));
69: return(1);
70: }
71:
72: pw_init();
73: pfd = pw_lock();
74: tfd = pw_tmp();
75:
76: /*
77: * Get the new password. Reset passwd change time to zero; when
78: * classes are implemented, go and get the "offset" value for this
79: * class and reset the timer.
80: */
81: pw->pw_passwd = getnewpasswd(pw);
82: pw->pw_change = 0;
83: pw_copy(pfd, tfd, pw);
84:
85: if (!pw_mkdb())
86: pw_error((char *)NULL, 0, 1);
87: return(0);
88: }
89:
90: char *
91: getnewpasswd(pw)
92: register struct passwd *pw;
93: {
94: register char *p, *t;
95: int tries;
96: char buf[_PASSWORD_LEN+1], salt[9], *crypt(), *getpass();
97:
98: (void)printf("Changing local password for %s.\n", pw->pw_name);
99:
100: if (uid && pw->pw_passwd[0] &&
101: strcmp(crypt(getpass("Old password:"), pw->pw_passwd),
102: pw->pw_passwd)) {
103: errno = EACCES;
104: pw_error(NULL, 1, 1);
105: }
106:
107: for (buf[0] = '\0', tries = 0;;) {
108: p = getpass("New password:");
109: if (!*p) {
110: (void)printf("Password unchanged.\n");
111: pw_error(NULL, 0, 0);
112: }
113: if (strlen(p) <= 5 && ++tries < 2) {
114: (void)printf("Please enter a longer password.\n");
115: continue;
116: }
117: for (t = p; *t && islower(*t); ++t);
118: if (!*t && ++tries < 2) {
119: (void)printf("Please don't use an all-lower case password.\nUnusual capitalization, control characters or digits are suggested.\n");
120: continue;
121: }
122: (void)strcpy(buf, p);
123: if (!strcmp(buf, getpass("Retype new password:")))
124: break;
125: (void)printf("Mismatch; try again, EOF to quit.\n");
126: }
127: /* grab a random printable character that isn't a colon */
128: (void)srandom((int)time((time_t *)NULL));
129: #ifdef NEWSALT
130: salt[0] = _PASSWORD_EFMT1;
131: to64(&salt[1], (long)(29 * 25), 4);
132: to64(&salt[5], random(), 4);
133: #else
134: to64(&salt[0], random(), 2);
135: #endif
136: return(crypt(buf, salt));
137: }
138:
139: static unsigned char itoa64[] = /* 0 ... 63 => ascii - 64 */
140: "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
141:
142: to64(s, v, n)
143: register char *s;
144: register long v;
145: register int n;
146: {
147: while (--n >= 0) {
148: *s++ = itoa64[v&0x3f];
149: v >>= 6;
150: }
151: }
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