Annotation of src/usr.bin/passwd/local_passwd.c, Revision 1.28
1.28 ! deraadt 1: /* $OpenBSD: local_passwd.c,v 1.27 2003/03/30 20:50:05 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";*/
1.28 ! deraadt 38: static const char rcsid[] = "$OpenBSD: local_passwd.c,v 1.27 2003/03/30 20:50:05 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>
1.28 ! deraadt 50: #include <stdlib.h>
1.21 millert 51: #include <signal.h>
1.1 deraadt 52: #include <string.h>
1.2 deraadt 53: #include <unistd.h>
54: #include <util.h>
1.14 millert 55: #include <login_cap.h>
1.1 deraadt 56:
1.27 millert 57: #define UNCHANGED_MSG "Password unchanged.\n"
58:
1.7 weingart 59: static uid_t uid;
1.25 millert 60: extern int pwd_gensalt(char *, int, struct passwd *, login_cap_t *, char);
61: extern int pwd_check(struct passwd *, login_cap_t *, char *);
62: extern int pwd_gettries(struct passwd *, login_cap_t *);
1.14 millert 63:
1.25 millert 64: char *getnewpasswd(struct passwd *, login_cap_t *, int);
65: void kbintr(int);
1.1 deraadt 66:
1.7 weingart 67: int
1.26 deraadt 68: local_passwd(char *uname, int authenticated)
1.1 deraadt 69: {
70: struct passwd *pw;
1.14 millert 71: login_cap_t *lc;
1.15 millert 72: sigset_t fullset;
73: time_t period;
1.21 millert 74: int i, pfd, tfd = -1;
1.20 millert 75: int pwflags = _PASSWORD_OMITV7;
1.1 deraadt 76:
77: if (!(pw = getpwnam(uname))) {
78: #ifdef YP
79: extern int use_yp;
80: if (!use_yp)
81: #endif
1.7 weingart 82: warnx("unknown user %s.", uname);
1.1 deraadt 83: return(1);
84: }
1.14 millert 85: if ((lc = login_getclass(pw->pw_class)) == NULL) {
86: warnx("unable to get login class for user %s.", uname);
87: return(1);
88: }
1.1 deraadt 89:
1.13 millert 90: uid = authenticated ? pw->pw_uid : getuid();
1.1 deraadt 91: if (uid && uid != pw->pw_uid) {
1.8 millert 92: warnx("login/uid mismatch, username argument required.");
1.1 deraadt 93: return(1);
94: }
95:
1.14 millert 96: /* Get the new password. */
97: pw->pw_passwd = getnewpasswd(pw, lc, authenticated);
98:
99: /* Reset password change time based on login.conf. */
100: period = login_getcaptime(lc, "passwordtime", 0, 0);
1.19 millert 101: if (period > 0) {
1.14 millert 102: pw->pw_change = time(NULL) + period;
1.19 millert 103: } else {
104: /*
105: * If the pw change time is the same we only need
106: * to update the spwd.db file.
107: */
108: if (pw->pw_change != 0)
109: pw->pw_change = 0;
110: else
1.20 millert 111: pwflags = _PASSWORD_SECUREONLY;
1.19 millert 112: }
1.14 millert 113:
1.15 millert 114: /* Drop user's real uid and block all signals to avoid a DoS. */
115: setuid(0);
116: sigfillset(&fullset);
117: sigdelset(&fullset, SIGINT);
118: sigprocmask(SIG_BLOCK, &fullset, NULL);
119:
120: /* Get a lock on the passwd file and open it. */
121: pw_init();
1.21 millert 122: for (i = 1; (tfd = pw_lock(0)) == -1; i++) {
123: if (i == 4)
124: (void)fputs("Attempting lock password file, "
125: "please wait or press ^C to abort", stderr);
126: (void)signal(SIGINT, kbintr);
127: if (i % 16 == 0)
1.15 millert 128: fputc('.', stderr);
1.21 millert 129: usleep(250000);
1.15 millert 130: (void)signal(SIGINT, SIG_IGN);
131: }
1.21 millert 132: if (i >= 4)
133: fputc('\n', stderr);
1.15 millert 134: pfd = open(_PATH_MASTERPASSWD, O_RDONLY, 0);
135: if (pfd < 0 || fcntl(pfd, F_SETFD, 1) == -1)
136: pw_error(_PATH_MASTERPASSWD, 1, 1);
137:
1.18 millert 138: /* Update master.passwd file and rebuild spwd.db. */
1.1 deraadt 139: pw_copy(pfd, tfd, pw);
1.20 millert 140: if (pw_mkdb(uname, pwflags) < 0)
1.19 millert 141: pw_error(NULL, 0, 1);
1.14 millert 142:
1.1 deraadt 143: return(0);
144: }
145:
146: char *
1.26 deraadt 147: getnewpasswd(struct passwd *pw, login_cap_t *lc, int authenticated)
1.1 deraadt 148: {
1.22 mpech 149: char *p;
1.11 provos 150: int tries, pwd_tries;
1.13 millert 151: char buf[_PASSWORD_LEN+1], salt[_PASSWORD_LEN];
1.24 millert 152: sig_t saveint, savequit;
1.1 deraadt 153:
1.24 millert 154: saveint = signal(SIGINT, kbintr);
155: savequit = signal(SIGQUIT, kbintr);
1.23 millert 156:
1.13 millert 157: if (!authenticated) {
158: (void)printf("Changing local password for %s.\n", pw->pw_name);
1.27 millert 159: if (uid != 0 && pw->pw_passwd[0] != '\0') {
160: p = getpass("Old password:");
161: if (*p == '\0') {
162: (void)printf(UNCHANGED_MSG);
163: pw_abort();
164: exit(0);
165: }
166: if (strcmp(crypt(p, pw->pw_passwd), pw->pw_passwd)) {
167: errno = EACCES;
168: pw_error(NULL, 1, 1);
169: }
1.13 millert 170: }
1.1 deraadt 171: }
1.26 deraadt 172:
1.14 millert 173: pwd_tries = pwd_gettries(pw, lc);
1.1 deraadt 174:
175: for (buf[0] = '\0', tries = 0;;) {
176: p = getpass("New password:");
1.27 millert 177: if (*p == '\0') {
178: (void)printf(UNCHANGED_MSG);
179: pw_abort();
180: exit(0);
1.9 deraadt 181: }
182: if (strcmp(p, "s/key") == 0) {
183: printf("That password collides with a system feature. Choose another.\n");
184: continue;
1.1 deraadt 185: }
1.26 deraadt 186:
1.11 provos 187: if ((tries++ < pwd_tries || pwd_tries == 0)
1.14 millert 188: && pwd_check(pw, lc, p) == 0)
1.1 deraadt 189: continue;
1.13 millert 190: strlcpy(buf, p, sizeof(buf));
1.1 deraadt 191: if (!strcmp(buf, getpass("Retype new password:")))
192: break;
193: (void)printf("Mismatch; try again, EOF to quit.\n");
194: }
1.14 millert 195: if (!pwd_gensalt(salt, _PASSWORD_LEN, pw, lc, 'l')) {
1.6 provos 196: (void)printf("Couldn't generate salt.\n");
197: pw_error(NULL, 0, 0);
198: }
1.24 millert 199: (void)signal(SIGINT, saveint);
200: (void)signal(SIGQUIT, savequit);
1.23 millert 201:
1.1 deraadt 202: return(crypt(buf, salt));
1.15 millert 203: }
204:
205: void
1.26 deraadt 206: kbintr(int signo)
1.15 millert 207: {
1.27 millert 208: write(STDOUT_FILENO, UNCHANGED_MSG, sizeof(UNCHANGED_MSG) - 1);
209: _exit(0);
1.1 deraadt 210: }