Annotation of src/usr.bin/passwd/local_passwd.c, Revision 1.25
1.25 ! millert 1: /* $OpenBSD: local_passwd.c,v 1.24 2001/12/07 04:15:08 millert Exp $ */
1.3 deraadt 2:
1.1 deraadt 3: /*-
4: * Copyright (c) 1990 The Regents of the University of California.
5: * All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: * 3. All advertising materials mentioning features or use of this software
16: * must display the following acknowledgement:
17: * This product includes software developed by the University of
18: * California, Berkeley and its contributors.
19: * 4. Neither the name of the University nor the names of its contributors
20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
34: */
35:
36: #ifndef lint
1.16 millert 37: /*static const char sccsid[] = "from: @(#)local_passwd.c 5.5 (Berkeley) 5/6/91";*/
1.25 ! millert 38: static const char rcsid[] = "$OpenBSD: local_passwd.c,v 1.24 2001/12/07 04:15:08 millert Exp $";
1.1 deraadt 39: #endif /* not lint */
40:
41: #include <sys/types.h>
1.2 deraadt 42: #include <sys/stat.h>
1.21 millert 43: #include <sys/uio.h>
44:
1.7 weingart 45: #include <err.h>
1.1 deraadt 46: #include <errno.h>
1.21 millert 47: #include <fcntl.h>
48: #include <pwd.h>
1.1 deraadt 49: #include <stdio.h>
1.21 millert 50: #include <signal.h>
1.1 deraadt 51: #include <string.h>
1.2 deraadt 52: #include <unistd.h>
53: #include <util.h>
1.14 millert 54: #include <login_cap.h>
1.1 deraadt 55:
1.7 weingart 56: static uid_t uid;
1.25 ! millert 57: extern int pwd_gensalt(char *, int, struct passwd *, login_cap_t *, char);
! 58: extern int pwd_check(struct passwd *, login_cap_t *, char *);
! 59: extern int pwd_gettries(struct passwd *, login_cap_t *);
1.14 millert 60:
1.25 ! millert 61: char *getnewpasswd(struct passwd *, login_cap_t *, int);
! 62: void kbintr(int);
1.1 deraadt 63:
1.7 weingart 64: int
1.13 millert 65: local_passwd(uname, authenticated)
1.1 deraadt 66: char *uname;
1.13 millert 67: int authenticated;
1.1 deraadt 68: {
69: struct passwd *pw;
1.14 millert 70: login_cap_t *lc;
1.15 millert 71: sigset_t fullset;
72: time_t period;
1.21 millert 73: int i, pfd, tfd = -1;
1.20 millert 74: int pwflags = _PASSWORD_OMITV7;
1.1 deraadt 75:
76: if (!(pw = getpwnam(uname))) {
77: #ifdef YP
78: extern int use_yp;
79: if (!use_yp)
80: #endif
1.7 weingart 81: warnx("unknown user %s.", uname);
1.1 deraadt 82: return(1);
83: }
1.14 millert 84: if ((lc = login_getclass(pw->pw_class)) == NULL) {
85: warnx("unable to get login class for user %s.", uname);
86: return(1);
87: }
1.1 deraadt 88:
1.13 millert 89: uid = authenticated ? pw->pw_uid : getuid();
1.1 deraadt 90: if (uid && uid != pw->pw_uid) {
1.8 millert 91: warnx("login/uid mismatch, username argument required.");
1.1 deraadt 92: return(1);
93: }
94:
1.14 millert 95: /* Get the new password. */
96: pw->pw_passwd = getnewpasswd(pw, lc, authenticated);
97:
98: /* Reset password change time based on login.conf. */
99: period = login_getcaptime(lc, "passwordtime", 0, 0);
1.19 millert 100: if (period > 0) {
1.14 millert 101: pw->pw_change = time(NULL) + period;
1.19 millert 102: } else {
103: /*
104: * If the pw change time is the same we only need
105: * to update the spwd.db file.
106: */
107: if (pw->pw_change != 0)
108: pw->pw_change = 0;
109: else
1.20 millert 110: pwflags = _PASSWORD_SECUREONLY;
1.19 millert 111: }
1.14 millert 112:
1.15 millert 113: /* Drop user's real uid and block all signals to avoid a DoS. */
114: setuid(0);
115: sigfillset(&fullset);
116: sigdelset(&fullset, SIGINT);
117: sigprocmask(SIG_BLOCK, &fullset, NULL);
118:
119: /* Get a lock on the passwd file and open it. */
120: pw_init();
1.21 millert 121: for (i = 1; (tfd = pw_lock(0)) == -1; i++) {
122: if (i == 4)
123: (void)fputs("Attempting lock password file, "
124: "please wait or press ^C to abort", stderr);
125: (void)signal(SIGINT, kbintr);
126: if (i % 16 == 0)
1.15 millert 127: fputc('.', stderr);
1.21 millert 128: usleep(250000);
1.15 millert 129: (void)signal(SIGINT, SIG_IGN);
130: }
1.21 millert 131: if (i >= 4)
132: fputc('\n', stderr);
1.15 millert 133: pfd = open(_PATH_MASTERPASSWD, O_RDONLY, 0);
134: if (pfd < 0 || fcntl(pfd, F_SETFD, 1) == -1)
135: pw_error(_PATH_MASTERPASSWD, 1, 1);
136:
1.18 millert 137: /* Update master.passwd file and rebuild spwd.db. */
1.1 deraadt 138: pw_copy(pfd, tfd, pw);
1.20 millert 139: if (pw_mkdb(uname, pwflags) < 0)
1.19 millert 140: pw_error(NULL, 0, 1);
1.14 millert 141:
1.1 deraadt 142: return(0);
143: }
144:
145: char *
1.14 millert 146: getnewpasswd(pw, lc, authenticated)
147: struct passwd *pw;
148: login_cap_t *lc;
1.13 millert 149: int authenticated;
1.1 deraadt 150: {
1.22 mpech 151: char *p;
1.11 provos 152: int tries, pwd_tries;
1.13 millert 153: char buf[_PASSWORD_LEN+1], salt[_PASSWORD_LEN];
1.24 millert 154: sig_t saveint, savequit;
1.1 deraadt 155:
1.24 millert 156: saveint = signal(SIGINT, kbintr);
157: savequit = signal(SIGQUIT, kbintr);
1.23 millert 158:
1.13 millert 159: if (!authenticated) {
160: (void)printf("Changing local password for %s.\n", pw->pw_name);
161: if (uid && pw->pw_passwd[0] &&
162: strcmp(crypt(getpass("Old password:"), pw->pw_passwd),
163: pw->pw_passwd)) {
164: errno = EACCES;
165: pw_error(NULL, 1, 1);
166: }
1.1 deraadt 167: }
1.11 provos 168:
1.14 millert 169: pwd_tries = pwd_gettries(pw, lc);
1.1 deraadt 170:
171: for (buf[0] = '\0', tries = 0;;) {
172: p = getpass("New password:");
173: if (!*p) {
174: (void)printf("Password unchanged.\n");
175: pw_error(NULL, 0, 0);
1.9 deraadt 176: }
177: if (strcmp(p, "s/key") == 0) {
178: printf("That password collides with a system feature. Choose another.\n");
179: continue;
1.1 deraadt 180: }
1.11 provos 181:
182: if ((tries++ < pwd_tries || pwd_tries == 0)
1.14 millert 183: && pwd_check(pw, lc, p) == 0)
1.1 deraadt 184: continue;
1.13 millert 185: strlcpy(buf, p, sizeof(buf));
1.1 deraadt 186: if (!strcmp(buf, getpass("Retype new password:")))
187: break;
188: (void)printf("Mismatch; try again, EOF to quit.\n");
189: }
1.14 millert 190: if (!pwd_gensalt(salt, _PASSWORD_LEN, pw, lc, 'l')) {
1.6 provos 191: (void)printf("Couldn't generate salt.\n");
192: pw_error(NULL, 0, 0);
193: }
1.24 millert 194: (void)signal(SIGINT, saveint);
195: (void)signal(SIGQUIT, savequit);
1.23 millert 196:
1.1 deraadt 197: return(crypt(buf, salt));
1.15 millert 198: }
199:
200: void
201: kbintr(signo)
202: int signo;
203: {
1.21 millert 204: char msg[] = "\nPassword unchanged.\n";
205: struct iovec iv[5];
206: extern char *__progname;
207:
1.24 millert 208: iv[0].iov_base = msg;
1.21 millert 209: iv[0].iov_len = sizeof(msg) - 1;
210: iv[1].iov_base = __progname;
211: iv[1].iov_len = strlen(__progname);
212: iv[2].iov_base = ": ";
213: iv[2].iov_len = 2;
214: iv[3].iov_base = _PATH_MASTERPASSWD;
215: iv[3].iov_len = sizeof(_PATH_MASTERPASSWD) - 1;
216: iv[4].iov_base = " unchanged\n";
217: iv[4].iov_len = 11;
218: writev(STDERR_FILENO, iv, 5);
1.15 millert 219:
220: _exit(1);
1.1 deraadt 221: }
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