Annotation of src/usr.bin/passwd/local_passwd.c, Revision 1.38
1.38 ! jsing 1: /* $OpenBSD: local_passwd.c,v 1.37 2005/05/01 18:47:06 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";*/
1.38 ! jsing 34: static const char rcsid[] = "$OpenBSD: local_passwd.c,v 1.37 2005/05/01 18:47:06 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;
1.33 millert 56: extern int pwd_gensalt(char *, int, login_cap_t *, char);
57: extern int pwd_check(login_cap_t *, char *);
58: extern int pwd_gettries(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: {
1.32 millert 66: struct passwd *pw, *opw;
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: }
1.32 millert 81: if ((opw = pw_dup(pw)) == NULL) {
82: warn(NULL);
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);
1.36 moritz 87: free(opw);
1.14 millert 88: return(1);
89: }
1.1 deraadt 90:
1.13 millert 91: uid = authenticated ? pw->pw_uid : getuid();
1.1 deraadt 92: if (uid && uid != pw->pw_uid) {
1.8 millert 93: warnx("login/uid mismatch, username argument required.");
1.36 moritz 94: free(opw);
1.1 deraadt 95: return(1);
96: }
97:
1.14 millert 98: /* Get the new password. */
99: pw->pw_passwd = getnewpasswd(pw, lc, authenticated);
100:
101: /* Reset password change time based on login.conf. */
1.30 deraadt 102: period = (time_t)login_getcaptime(lc, "passwordtime",
103: (quad_t)0, (quad_t)0);
1.19 millert 104: if (period > 0) {
1.14 millert 105: pw->pw_change = time(NULL) + period;
1.19 millert 106: } else {
107: /*
108: * If the pw change time is the same we only need
109: * to update the spwd.db file.
110: */
111: if (pw->pw_change != 0)
112: pw->pw_change = 0;
113: else
1.20 millert 114: pwflags = _PASSWORD_SECUREONLY;
1.19 millert 115: }
1.14 millert 116:
1.15 millert 117: /* Drop user's real uid and block all signals to avoid a DoS. */
118: setuid(0);
119: sigfillset(&fullset);
120: sigdelset(&fullset, SIGINT);
121: sigprocmask(SIG_BLOCK, &fullset, NULL);
122:
123: /* Get a lock on the passwd file and open it. */
124: pw_init();
1.21 millert 125: for (i = 1; (tfd = pw_lock(0)) == -1; i++) {
126: if (i == 4)
1.38 ! jsing 127: (void)fputs("Attempting to lock password file, "
1.21 millert 128: "please wait or press ^C to abort", stderr);
129: (void)signal(SIGINT, kbintr);
130: if (i % 16 == 0)
1.15 millert 131: fputc('.', stderr);
1.21 millert 132: usleep(250000);
1.15 millert 133: (void)signal(SIGINT, SIG_IGN);
134: }
1.21 millert 135: if (i >= 4)
136: fputc('\n', stderr);
1.15 millert 137: pfd = open(_PATH_MASTERPASSWD, O_RDONLY, 0);
1.36 moritz 138: if (pfd < 0 || fcntl(pfd, F_SETFD, FD_CLOEXEC) == -1)
1.15 millert 139: pw_error(_PATH_MASTERPASSWD, 1, 1);
140:
1.18 millert 141: /* Update master.passwd file and rebuild spwd.db. */
1.32 millert 142: pw_copy(pfd, tfd, pw, opw);
143: free(opw);
1.20 millert 144: if (pw_mkdb(uname, pwflags) < 0)
1.19 millert 145: pw_error(NULL, 0, 1);
1.14 millert 146:
1.1 deraadt 147: return(0);
148: }
149:
150: char *
1.26 deraadt 151: getnewpasswd(struct passwd *pw, login_cap_t *lc, int authenticated)
1.1 deraadt 152: {
1.22 mpech 153: char *p;
1.11 provos 154: int tries, pwd_tries;
1.13 millert 155: char buf[_PASSWORD_LEN+1], salt[_PASSWORD_LEN];
1.24 millert 156: sig_t saveint, savequit;
1.1 deraadt 157:
1.24 millert 158: saveint = signal(SIGINT, kbintr);
159: savequit = signal(SIGQUIT, kbintr);
1.23 millert 160:
1.13 millert 161: if (!authenticated) {
162: (void)printf("Changing local password for %s.\n", pw->pw_name);
1.27 millert 163: if (uid != 0 && pw->pw_passwd[0] != '\0') {
164: p = getpass("Old password:");
1.31 millert 165: if (p == NULL || *p == '\0') {
1.27 millert 166: (void)printf(UNCHANGED_MSG);
167: pw_abort();
1.31 millert 168: exit(p == NULL ? 1 : 0);
1.27 millert 169: }
170: if (strcmp(crypt(p, pw->pw_passwd), pw->pw_passwd)) {
171: errno = EACCES;
172: pw_error(NULL, 1, 1);
173: }
1.13 millert 174: }
1.1 deraadt 175: }
1.26 deraadt 176:
1.33 millert 177: pwd_tries = pwd_gettries(lc);
1.1 deraadt 178:
179: for (buf[0] = '\0', tries = 0;;) {
180: p = getpass("New password:");
1.31 millert 181: if (p == NULL || *p == '\0') {
1.27 millert 182: (void)printf(UNCHANGED_MSG);
183: pw_abort();
1.31 millert 184: exit(p == NULL ? 1 : 0);
1.9 deraadt 185: }
186: if (strcmp(p, "s/key") == 0) {
187: printf("That password collides with a system feature. Choose another.\n");
188: continue;
1.1 deraadt 189: }
1.26 deraadt 190:
1.37 deraadt 191: if ((tries++ < pwd_tries || pwd_tries == 0) &&
192: pwd_check(lc, p) == 0)
1.1 deraadt 193: continue;
1.13 millert 194: strlcpy(buf, p, sizeof(buf));
1.31 millert 195: p = getpass("Retype new password:");
196: if (p != NULL && strcmp(buf, p) == 0)
1.1 deraadt 197: break;
198: (void)printf("Mismatch; try again, EOF to quit.\n");
199: }
1.33 millert 200: if (!pwd_gensalt(salt, _PASSWORD_LEN, lc, 'l')) {
1.6 provos 201: (void)printf("Couldn't generate salt.\n");
202: pw_error(NULL, 0, 0);
203: }
1.24 millert 204: (void)signal(SIGINT, saveint);
205: (void)signal(SIGQUIT, savequit);
1.23 millert 206:
1.1 deraadt 207: return(crypt(buf, salt));
1.15 millert 208: }
209:
1.35 deraadt 210: /* ARGSUSED */
1.15 millert 211: void
1.26 deraadt 212: kbintr(int signo)
1.15 millert 213: {
1.34 millert 214: write(STDOUT_FILENO, "\n", 1);
1.27 millert 215: write(STDOUT_FILENO, UNCHANGED_MSG, sizeof(UNCHANGED_MSG) - 1);
216: _exit(0);
1.1 deraadt 217: }