Annotation of src/usr.bin/passwd/local_passwd.c, Revision 1.2
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";*/
1.2 ! deraadt 36: static char rcsid[] = "$Id: local_passwd.c,v 1.1.1.1 1995/10/18 08:45:54 deraadt Exp $";
1.1 deraadt 37: #endif /* not lint */
38:
39: #include <sys/types.h>
1.2 ! deraadt 40: #include <sys/stat.h>
1.1 deraadt 41: #include <pwd.h>
42: #include <errno.h>
43: #include <stdio.h>
44: #include <string.h>
1.2 ! deraadt 45: #include <unistd.h>
! 46: #include <fcntl.h>
! 47: #include <util.h>
1.1 deraadt 48:
49: uid_t uid;
50:
51: char *progname = "passwd";
52: char *tempname;
53:
54: local_passwd(uname)
55: char *uname;
56: {
57: struct passwd *pw;
58: int pfd, tfd;
59: char *getnewpasswd();
60:
61: if (!(pw = getpwnam(uname))) {
62: #ifdef YP
63: extern int use_yp;
64: if (!use_yp)
65: #endif
66: (void)fprintf(stderr, "passwd: unknown user %s.\n", uname);
67: return(1);
68: }
69:
70: uid = getuid();
71: if (uid && uid != pw->pw_uid) {
72: (void)fprintf(stderr, "passwd: %s\n", strerror(EACCES));
73: return(1);
74: }
75:
76: pw_init();
1.2 ! deraadt 77: tfd = pw_lock(0);
! 78: if (tfd < 0)
! 79: errx(1, "the passwd file is busy.");
! 80: pfd = open(_PATH_MASTERPASSWD, O_RDONLY, 0);
! 81: if (pfd < 0)
! 82: pw_error(_PATH_MASTERPASSWD, 1, 1);
1.1 deraadt 83:
84: /*
85: * Get the new password. Reset passwd change time to zero; when
86: * classes are implemented, go and get the "offset" value for this
87: * class and reset the timer.
88: */
89: pw->pw_passwd = getnewpasswd(pw);
90: pw->pw_change = 0;
91: pw_copy(pfd, tfd, pw);
92:
1.2 ! deraadt 93: if (pw_mkdb() < 0)
1.1 deraadt 94: pw_error((char *)NULL, 0, 1);
95: return(0);
96: }
97:
98: char *
99: getnewpasswd(pw)
100: register struct passwd *pw;
101: {
102: register char *p, *t;
103: int tries;
104: char buf[_PASSWORD_LEN+1], salt[9], *crypt(), *getpass();
105:
106: (void)printf("Changing local password for %s.\n", pw->pw_name);
107:
108: if (uid && pw->pw_passwd[0] &&
109: strcmp(crypt(getpass("Old password:"), pw->pw_passwd),
110: pw->pw_passwd)) {
111: errno = EACCES;
112: pw_error(NULL, 1, 1);
113: }
114:
115: for (buf[0] = '\0', tries = 0;;) {
116: p = getpass("New password:");
117: if (!*p) {
118: (void)printf("Password unchanged.\n");
119: pw_error(NULL, 0, 0);
120: }
121: if (strlen(p) <= 5 && ++tries < 2) {
122: (void)printf("Please enter a longer password.\n");
123: continue;
124: }
125: for (t = p; *t && islower(*t); ++t);
126: if (!*t && ++tries < 2) {
127: (void)printf("Please don't use an all-lower case password.\nUnusual capitalization, control characters or digits are suggested.\n");
128: continue;
129: }
130: (void)strcpy(buf, p);
131: if (!strcmp(buf, getpass("Retype new password:")))
132: break;
133: (void)printf("Mismatch; try again, EOF to quit.\n");
134: }
135: /* grab a random printable character that isn't a colon */
136: (void)srandom((int)time((time_t *)NULL));
137: #ifdef NEWSALT
138: salt[0] = _PASSWORD_EFMT1;
139: to64(&salt[1], (long)(29 * 25), 4);
140: to64(&salt[5], random(), 4);
141: #else
142: to64(&salt[0], random(), 2);
143: #endif
144: return(crypt(buf, salt));
145: }
146:
147: static unsigned char itoa64[] = /* 0 ... 63 => ascii - 64 */
148: "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
149:
150: to64(s, v, n)
151: register char *s;
152: register long v;
153: register int n;
154: {
155: while (--n >= 0) {
156: *s++ = itoa64[v&0x3f];
157: v >>= 6;
158: }
159: }