Annotation of src/usr.bin/passwd/local_passwd.c, Revision 1.49
1.49 ! tedu 1: /* $OpenBSD: local_passwd.c,v 1.48 2016/08/15 04:28:31 guenther 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: #include <sys/types.h>
1.2 deraadt 33: #include <sys/stat.h>
1.21 millert 34: #include <sys/uio.h>
35:
1.7 weingart 36: #include <err.h>
1.1 deraadt 37: #include <errno.h>
1.21 millert 38: #include <fcntl.h>
39: #include <pwd.h>
1.1 deraadt 40: #include <stdio.h>
1.28 deraadt 41: #include <stdlib.h>
1.21 millert 42: #include <signal.h>
1.1 deraadt 43: #include <string.h>
1.2 deraadt 44: #include <unistd.h>
45: #include <util.h>
1.14 millert 46: #include <login_cap.h>
1.1 deraadt 47:
1.49 ! tedu 48: #define UNCHANGED_MSG "Password unchanged."
1.27 millert 49:
1.7 weingart 50: static uid_t uid;
1.33 millert 51: extern int pwd_check(login_cap_t *, char *);
52: extern int pwd_gettries(login_cap_t *);
1.14 millert 53:
1.39 djm 54: int local_passwd(char *, int);
1.25 millert 55: char *getnewpasswd(struct passwd *, login_cap_t *, int);
56: void kbintr(int);
1.1 deraadt 57:
1.7 weingart 58: int
1.26 deraadt 59: local_passwd(char *uname, int authenticated)
1.1 deraadt 60: {
1.32 millert 61: struct passwd *pw, *opw;
1.14 millert 62: login_cap_t *lc;
1.15 millert 63: sigset_t fullset;
64: time_t period;
1.21 millert 65: int i, pfd, tfd = -1;
1.20 millert 66: int pwflags = _PASSWORD_OMITV7;
1.1 deraadt 67:
1.47 tim 68: if (!(pw = getpwnam_shadow(uname))) {
1.7 weingart 69: warnx("unknown user %s.", uname);
1.1 deraadt 70: return(1);
71: }
1.46 deraadt 72:
73: if (pledge("stdio rpath wpath cpath getpw tty id proc exec", NULL) == -1)
74: err(1, "pledge");
75:
1.32 millert 76: if ((opw = pw_dup(pw)) == NULL) {
77: warn(NULL);
78: return(1);
79: }
1.14 millert 80: if ((lc = login_getclass(pw->pw_class)) == NULL) {
81: warnx("unable to get login class for user %s.", uname);
1.36 moritz 82: free(opw);
1.14 millert 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.");
1.36 moritz 89: free(opw);
1.1 deraadt 90: return(1);
91: }
92:
1.14 millert 93: /* Get the new password. */
94: pw->pw_passwd = getnewpasswd(pw, lc, authenticated);
95:
1.46 deraadt 96: if (pledge("stdio rpath wpath cpath getpw id proc exec", NULL) == -1)
97: err(1, "pledge");
98:
1.14 millert 99: /* Reset password change time based on login.conf. */
1.48 guenther 100: period = (time_t)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:
1.46 deraadt 120: if (pledge("stdio rpath wpath cpath proc exec", NULL) == -1)
121: err(1, "pledge");
122:
1.15 millert 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);
1.41 guenther 137: pfd = open(_PATH_MASTERPASSWD, O_RDONLY | O_CLOEXEC, 0);
138: if (pfd < 0)
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: {
1.43 tedu 153: static char hash[_PASSWORD_LEN];
1.44 tedu 154: char *p, *pref;
1.11 provos 155: int tries, pwd_tries;
1.43 tedu 156: char buf[1024];
1.24 millert 157: sig_t saveint, savequit;
1.1 deraadt 158:
1.24 millert 159: saveint = signal(SIGINT, kbintr);
160: savequit = signal(SIGQUIT, kbintr);
1.23 millert 161:
1.13 millert 162: if (!authenticated) {
1.46 deraadt 163: (void)printf("Changing password for %s.\n", pw->pw_name);
1.27 millert 164: if (uid != 0 && pw->pw_passwd[0] != '\0') {
165: p = getpass("Old password:");
1.31 millert 166: if (p == NULL || *p == '\0') {
1.49 ! tedu 167: (void)printf("%s\n", UNCHANGED_MSG);
1.27 millert 168: pw_abort();
1.31 millert 169: exit(p == NULL ? 1 : 0);
1.27 millert 170: }
1.42 tedu 171: if (crypt_checkpass(p, pw->pw_passwd) != 0) {
1.27 millert 172: errno = EACCES;
173: pw_error(NULL, 1, 1);
174: }
1.13 millert 175: }
1.1 deraadt 176: }
1.26 deraadt 177:
1.33 millert 178: pwd_tries = pwd_gettries(lc);
1.1 deraadt 179:
180: for (buf[0] = '\0', tries = 0;;) {
181: p = getpass("New password:");
1.31 millert 182: if (p == NULL || *p == '\0') {
1.49 ! tedu 183: (void)printf("%s\n", UNCHANGED_MSG);
1.27 millert 184: pw_abort();
1.31 millert 185: exit(p == NULL ? 1 : 0);
1.9 deraadt 186: }
187: if (strcmp(p, "s/key") == 0) {
188: printf("That password collides with a system feature. Choose another.\n");
189: continue;
1.1 deraadt 190: }
1.26 deraadt 191:
1.37 deraadt 192: if ((tries++ < pwd_tries || pwd_tries == 0) &&
193: pwd_check(lc, p) == 0)
1.1 deraadt 194: continue;
1.13 millert 195: strlcpy(buf, p, sizeof(buf));
1.31 millert 196: p = getpass("Retype new password:");
197: if (p != NULL && strcmp(buf, p) == 0)
1.1 deraadt 198: break;
199: (void)printf("Mismatch; try again, EOF to quit.\n");
200: }
1.43 tedu 201:
1.24 millert 202: (void)signal(SIGINT, saveint);
203: (void)signal(SIGQUIT, savequit);
1.23 millert 204:
1.44 tedu 205: pref = login_getcapstr(lc, "localcipher", NULL, NULL);
206: if (crypt_newhash(buf, pref, hash, sizeof(hash)) != 0) {
1.43 tedu 207: (void)printf("Couldn't generate hash.\n");
208: pw_error(NULL, 0, 0);
209: }
1.44 tedu 210: free(pref);
1.43 tedu 211: return hash;
1.15 millert 212: }
213:
214: void
1.26 deraadt 215: kbintr(int signo)
1.15 millert 216: {
1.49 ! tedu 217: dprintf(STDOUT_FILENO, "\n%s\n", UNCHANGED_MSG);
1.27 millert 218: _exit(0);
1.1 deraadt 219: }
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