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