Annotation of src/usr.bin/passwd/local_passwd.c, Revision 1.17
1.17 ! millert 1: /* $OpenBSD: local_passwd.c,v 1.16 2001/07/07 00:10:49 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";*/
1.17 ! millert 38: static const char rcsid[] = "$OpenBSD: local_passwd.c,v 1.16 2001/07/07 00:10:49 millert Exp $";
1.1 deraadt 39: #endif /* not lint */
40:
41: #include <sys/types.h>
1.2 deraadt 42: #include <sys/stat.h>
1.1 deraadt 43: #include <pwd.h>
1.7 weingart 44: #include <err.h>
1.1 deraadt 45: #include <errno.h>
46: #include <stdio.h>
47: #include <string.h>
1.2 deraadt 48: #include <unistd.h>
1.7 weingart 49: #include <ctype.h>
1.2 deraadt 50: #include <fcntl.h>
1.15 millert 51: #include <signal.h>
1.2 deraadt 52: #include <util.h>
1.14 millert 53: #include <login_cap.h>
1.1 deraadt 54:
1.7 weingart 55: static uid_t uid;
1.14 millert 56: extern int pwd_gensalt __P((char *, int, struct passwd *, login_cap_t *, char));
57: extern int pwd_check __P((struct passwd *, login_cap_t *, char *));
58: extern int pwd_gettries __P((struct passwd *, login_cap_t *));
59:
60: char *getnewpasswd __P((struct passwd *, login_cap_t *, int));
1.15 millert 61: void kbintr __P((int));
1.1 deraadt 62:
1.7 weingart 63: int
1.13 millert 64: local_passwd(uname, authenticated)
1.1 deraadt 65: char *uname;
1.13 millert 66: int authenticated;
1.1 deraadt 67: {
68: struct passwd *pw;
1.14 millert 69: login_cap_t *lc;
1.15 millert 70: sigset_t fullset;
71: time_t period;
1.16 millert 72: int pfd, tfd = -1;
1.15 millert 73: char *s = NULL;
1.1 deraadt 74:
75: if (!(pw = getpwnam(uname))) {
76: #ifdef YP
77: extern int use_yp;
78: if (!use_yp)
79: #endif
1.7 weingart 80: warnx("unknown user %s.", uname);
1.1 deraadt 81: return(1);
82: }
1.14 millert 83: if ((lc = login_getclass(pw->pw_class)) == NULL) {
84: warnx("unable to get login class for user %s.", uname);
85: return(1);
86: }
1.1 deraadt 87:
1.13 millert 88: uid = authenticated ? pw->pw_uid : getuid();
1.1 deraadt 89: if (uid && uid != pw->pw_uid) {
1.8 millert 90: warnx("login/uid mismatch, username argument required.");
1.1 deraadt 91: return(1);
92: }
93:
1.14 millert 94: /* Get the new password. */
95: pw->pw_passwd = getnewpasswd(pw, lc, authenticated);
96:
97: /* Reset password change time based on login.conf. */
98: period = login_getcaptime(lc, "passwordtime", 0, 0);
99: if (period > 0)
100: pw->pw_change = time(NULL) + period;
101: else
102: pw->pw_change = 0;
103:
1.15 millert 104: /* Drop user's real uid and block all signals to avoid a DoS. */
105: setuid(0);
106: sigfillset(&fullset);
107: sigdelset(&fullset, SIGINT);
108: sigprocmask(SIG_BLOCK, &fullset, NULL);
109:
110: /* Get a lock on the passwd file and open it. */
111: pw_init();
112: for (;;) {
113: int i, c, d;
114:
115: for (i = 0; i < (s ? 64 : 8) && (tfd = pw_lock(0)) == -1; i++) {
1.17 ! millert 116: if (i == 0)
! 117: (void)fputs("Please wait", stderr);
1.15 millert 118: (void)signal(SIGINT, kbintr);
119: fputc('.', stderr);
120: usleep(250000);
121: (void)signal(SIGINT, SIG_IGN);
122: }
1.17 ! millert 123: if (i)
! 124: fputc('\n', stderr);
1.15 millert 125: if (tfd != -1)
126: break;
127:
128: /* Unable to lock passwd file, let the user decide. */
129: if (errno == EEXIST) {
130: if (s == NULL)
131: s = "The passwd file is busy,";
132: else
133: s = "The passwd file is still busy,";
134: } else
135: s = "Unable to open passwd temp file,";
136: (void)fprintf(stderr,
137: "%s do you want to wait until it is available? [y/n] ", s);
138: (void)signal(SIGINT, kbintr);
139: c = getchar();
140: (void)signal(SIGINT, SIG_IGN);
141: if (c != '\n')
142: while ((d = getchar()) != '\n' && d != EOF)
143: ;
144: if (tolower(c) != 'y') {
145: printf("Password unchanged\n");
146: exit(1);
147: }
148: }
149: pfd = open(_PATH_MASTERPASSWD, O_RDONLY, 0);
150: if (pfd < 0 || fcntl(pfd, F_SETFD, 1) == -1)
151: pw_error(_PATH_MASTERPASSWD, 1, 1);
152:
1.14 millert 153: /* Update master.passwd file and build .db version. */
1.1 deraadt 154: pw_copy(pfd, tfd, pw);
1.12 millert 155: if (pw_mkdb(uname) < 0)
1.1 deraadt 156: pw_error((char *)NULL, 0, 1);
1.14 millert 157:
1.1 deraadt 158: return(0);
159: }
160:
161: char *
1.14 millert 162: getnewpasswd(pw, lc, authenticated)
163: struct passwd *pw;
164: login_cap_t *lc;
1.13 millert 165: int authenticated;
1.1 deraadt 166: {
1.13 millert 167: register char *p;
1.11 provos 168: int tries, pwd_tries;
1.13 millert 169: char buf[_PASSWORD_LEN+1], salt[_PASSWORD_LEN];
1.1 deraadt 170:
1.13 millert 171: if (!authenticated) {
172: (void)printf("Changing local password for %s.\n", pw->pw_name);
173: if (uid && pw->pw_passwd[0] &&
174: strcmp(crypt(getpass("Old password:"), pw->pw_passwd),
175: pw->pw_passwd)) {
176: errno = EACCES;
177: pw_error(NULL, 1, 1);
178: }
1.1 deraadt 179: }
1.11 provos 180:
1.14 millert 181: pwd_tries = pwd_gettries(pw, lc);
1.1 deraadt 182:
183: for (buf[0] = '\0', tries = 0;;) {
184: p = getpass("New password:");
185: if (!*p) {
186: (void)printf("Password unchanged.\n");
187: pw_error(NULL, 0, 0);
1.9 deraadt 188: }
189: if (strcmp(p, "s/key") == 0) {
190: printf("That password collides with a system feature. Choose another.\n");
191: continue;
1.1 deraadt 192: }
1.11 provos 193:
194: if ((tries++ < pwd_tries || pwd_tries == 0)
1.14 millert 195: && pwd_check(pw, lc, p) == 0)
1.1 deraadt 196: continue;
1.13 millert 197: strlcpy(buf, p, sizeof(buf));
1.1 deraadt 198: if (!strcmp(buf, getpass("Retype new password:")))
199: break;
200: (void)printf("Mismatch; try again, EOF to quit.\n");
201: }
1.14 millert 202: if (!pwd_gensalt(salt, _PASSWORD_LEN, pw, lc, 'l')) {
1.6 provos 203: (void)printf("Couldn't generate salt.\n");
204: pw_error(NULL, 0, 0);
205: }
1.1 deraadt 206: return(crypt(buf, salt));
1.15 millert 207: }
208:
209: void
210: kbintr(signo)
211: int signo;
212: {
213: char msg[] = "\nPassword unchanged\n";
214:
215: write(STDOUT_FILENO, msg, sizeof(msg) - 1);
216: _exit(1);
1.1 deraadt 217: }
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