Annotation of src/usr.bin/passwd/local_passwd.c, Revision 1.31
1.31 ! millert 1: /* $OpenBSD: local_passwd.c,v 1.30 2003/06/20 16:53:27 deraadt 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.
1.29 millert 15: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 16: * may be used to endorse or promote products derived from this software
17: * without specific prior written permission.
18: *
19: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29: * SUCH DAMAGE.
30: */
31:
32: #ifndef lint
1.16 millert 33: /*static const char sccsid[] = "from: @(#)local_passwd.c 5.5 (Berkeley) 5/6/91";*/
1.31 ! millert 34: static const char rcsid[] = "$OpenBSD: local_passwd.c,v 1.30 2003/06/20 16:53:27 deraadt Exp $";
1.1 deraadt 35: #endif /* not lint */
36:
37: #include <sys/types.h>
1.2 deraadt 38: #include <sys/stat.h>
1.21 millert 39: #include <sys/uio.h>
40:
1.7 weingart 41: #include <err.h>
1.1 deraadt 42: #include <errno.h>
1.21 millert 43: #include <fcntl.h>
44: #include <pwd.h>
1.1 deraadt 45: #include <stdio.h>
1.28 deraadt 46: #include <stdlib.h>
1.21 millert 47: #include <signal.h>
1.1 deraadt 48: #include <string.h>
1.2 deraadt 49: #include <unistd.h>
50: #include <util.h>
1.14 millert 51: #include <login_cap.h>
1.1 deraadt 52:
1.27 millert 53: #define UNCHANGED_MSG "Password unchanged.\n"
54:
1.7 weingart 55: static uid_t uid;
1.25 millert 56: extern int pwd_gensalt(char *, int, struct passwd *, login_cap_t *, char);
57: extern int pwd_check(struct passwd *, login_cap_t *, char *);
58: extern int pwd_gettries(struct passwd *, login_cap_t *);
1.14 millert 59:
1.25 millert 60: char *getnewpasswd(struct passwd *, login_cap_t *, int);
61: void kbintr(int);
1.1 deraadt 62:
1.7 weingart 63: int
1.26 deraadt 64: local_passwd(char *uname, int authenticated)
1.1 deraadt 65: {
66: struct passwd *pw;
1.14 millert 67: login_cap_t *lc;
1.15 millert 68: sigset_t fullset;
69: time_t period;
1.21 millert 70: int i, pfd, tfd = -1;
1.20 millert 71: int pwflags = _PASSWORD_OMITV7;
1.1 deraadt 72:
73: if (!(pw = getpwnam(uname))) {
74: #ifdef YP
75: extern int use_yp;
76: if (!use_yp)
77: #endif
1.7 weingart 78: warnx("unknown user %s.", uname);
1.1 deraadt 79: return(1);
80: }
1.14 millert 81: if ((lc = login_getclass(pw->pw_class)) == NULL) {
82: warnx("unable to get login class for user %s.", uname);
83: return(1);
84: }
1.1 deraadt 85:
1.13 millert 86: uid = authenticated ? pw->pw_uid : getuid();
1.1 deraadt 87: if (uid && uid != pw->pw_uid) {
1.8 millert 88: warnx("login/uid mismatch, username argument required.");
1.1 deraadt 89: return(1);
90: }
91:
1.14 millert 92: /* Get the new password. */
93: pw->pw_passwd = getnewpasswd(pw, lc, authenticated);
94:
95: /* Reset password change time based on login.conf. */
1.30 deraadt 96: period = (time_t)login_getcaptime(lc, "passwordtime",
97: (quad_t)0, (quad_t)0);
1.19 millert 98: if (period > 0) {
1.14 millert 99: pw->pw_change = time(NULL) + period;
1.19 millert 100: } else {
101: /*
102: * If the pw change time is the same we only need
103: * to update the spwd.db file.
104: */
105: if (pw->pw_change != 0)
106: pw->pw_change = 0;
107: else
1.20 millert 108: pwflags = _PASSWORD_SECUREONLY;
1.19 millert 109: }
1.14 millert 110:
1.15 millert 111: /* Drop user's real uid and block all signals to avoid a DoS. */
112: setuid(0);
113: sigfillset(&fullset);
114: sigdelset(&fullset, SIGINT);
115: sigprocmask(SIG_BLOCK, &fullset, NULL);
116:
117: /* Get a lock on the passwd file and open it. */
118: pw_init();
1.21 millert 119: for (i = 1; (tfd = pw_lock(0)) == -1; i++) {
120: if (i == 4)
121: (void)fputs("Attempting lock password file, "
122: "please wait or press ^C to abort", stderr);
123: (void)signal(SIGINT, kbintr);
124: if (i % 16 == 0)
1.15 millert 125: fputc('.', stderr);
1.21 millert 126: usleep(250000);
1.15 millert 127: (void)signal(SIGINT, SIG_IGN);
128: }
1.21 millert 129: if (i >= 4)
130: fputc('\n', stderr);
1.15 millert 131: pfd = open(_PATH_MASTERPASSWD, O_RDONLY, 0);
132: if (pfd < 0 || fcntl(pfd, F_SETFD, 1) == -1)
133: pw_error(_PATH_MASTERPASSWD, 1, 1);
134:
1.18 millert 135: /* Update master.passwd file and rebuild spwd.db. */
1.1 deraadt 136: pw_copy(pfd, tfd, pw);
1.20 millert 137: if (pw_mkdb(uname, pwflags) < 0)
1.19 millert 138: pw_error(NULL, 0, 1);
1.14 millert 139:
1.1 deraadt 140: return(0);
141: }
142:
143: char *
1.26 deraadt 144: getnewpasswd(struct passwd *pw, login_cap_t *lc, int authenticated)
1.1 deraadt 145: {
1.22 mpech 146: char *p;
1.11 provos 147: int tries, pwd_tries;
1.13 millert 148: char buf[_PASSWORD_LEN+1], salt[_PASSWORD_LEN];
1.24 millert 149: sig_t saveint, savequit;
1.1 deraadt 150:
1.24 millert 151: saveint = signal(SIGINT, kbintr);
152: savequit = signal(SIGQUIT, kbintr);
1.23 millert 153:
1.13 millert 154: if (!authenticated) {
155: (void)printf("Changing local password for %s.\n", pw->pw_name);
1.27 millert 156: if (uid != 0 && pw->pw_passwd[0] != '\0') {
157: p = getpass("Old password:");
1.31 ! millert 158: if (p == NULL || *p == '\0') {
1.27 millert 159: (void)printf(UNCHANGED_MSG);
160: pw_abort();
1.31 ! millert 161: exit(p == NULL ? 1 : 0);
1.27 millert 162: }
163: if (strcmp(crypt(p, pw->pw_passwd), pw->pw_passwd)) {
164: errno = EACCES;
165: pw_error(NULL, 1, 1);
166: }
1.13 millert 167: }
1.1 deraadt 168: }
1.26 deraadt 169:
1.14 millert 170: pwd_tries = pwd_gettries(pw, lc);
1.1 deraadt 171:
172: for (buf[0] = '\0', tries = 0;;) {
173: p = getpass("New password:");
1.31 ! millert 174: if (p == NULL || *p == '\0') {
1.27 millert 175: (void)printf(UNCHANGED_MSG);
176: pw_abort();
1.31 ! millert 177: exit(p == NULL ? 1 : 0);
1.9 deraadt 178: }
179: if (strcmp(p, "s/key") == 0) {
180: printf("That password collides with a system feature. Choose another.\n");
181: continue;
1.1 deraadt 182: }
1.26 deraadt 183:
1.11 provos 184: if ((tries++ < pwd_tries || pwd_tries == 0)
1.14 millert 185: && pwd_check(pw, lc, p) == 0)
1.1 deraadt 186: continue;
1.13 millert 187: strlcpy(buf, p, sizeof(buf));
1.31 ! millert 188: p = getpass("Retype new password:");
! 189: if (p != NULL && strcmp(buf, p) == 0)
1.1 deraadt 190: break;
191: (void)printf("Mismatch; try again, EOF to quit.\n");
192: }
1.14 millert 193: if (!pwd_gensalt(salt, _PASSWORD_LEN, pw, lc, 'l')) {
1.6 provos 194: (void)printf("Couldn't generate salt.\n");
195: pw_error(NULL, 0, 0);
196: }
1.24 millert 197: (void)signal(SIGINT, saveint);
198: (void)signal(SIGQUIT, savequit);
1.23 millert 199:
1.1 deraadt 200: return(crypt(buf, salt));
1.15 millert 201: }
202:
203: void
1.26 deraadt 204: kbintr(int signo)
1.15 millert 205: {
1.27 millert 206: write(STDOUT_FILENO, UNCHANGED_MSG, sizeof(UNCHANGED_MSG) - 1);
207: _exit(0);
1.1 deraadt 208: }