Annotation of src/usr.bin/passwd/local_passwd.c, Revision 1.63
1.63 ! robert 1: /* $OpenBSD: local_passwd.c,v 1.62 2021/10/24 21:24:17 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: #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>
1.54 mestre 39: #include <paths.h>
1.21 millert 40: #include <pwd.h>
1.1 deraadt 41: #include <stdio.h>
1.28 deraadt 42: #include <stdlib.h>
1.21 millert 43: #include <signal.h>
1.1 deraadt 44: #include <string.h>
1.2 deraadt 45: #include <unistd.h>
46: #include <util.h>
1.14 millert 47: #include <login_cap.h>
1.50 tedu 48: #include <readpassphrase.h>
1.1 deraadt 49:
1.49 tedu 50: #define UNCHANGED_MSG "Password unchanged."
1.27 millert 51:
1.7 weingart 52: static uid_t uid;
1.33 millert 53: extern int pwd_check(login_cap_t *, char *);
54: extern int pwd_gettries(login_cap_t *);
1.14 millert 55:
1.39 djm 56: int local_passwd(char *, int);
1.25 millert 57: char *getnewpasswd(struct passwd *, login_cap_t *, int);
58: void kbintr(int);
1.1 deraadt 59:
1.7 weingart 60: int
1.26 deraadt 61: local_passwd(char *uname, int authenticated)
1.1 deraadt 62: {
1.32 millert 63: struct passwd *pw, *opw;
1.14 millert 64: login_cap_t *lc;
1.15 millert 65: sigset_t fullset;
66: time_t period;
1.21 millert 67: int i, pfd, tfd = -1;
1.20 millert 68: int pwflags = _PASSWORD_OMITV7;
1.1 deraadt 69:
1.47 tim 70: if (!(pw = getpwnam_shadow(uname))) {
1.7 weingart 71: warnx("unknown user %s.", uname);
1.1 deraadt 72: return(1);
73: }
1.46 deraadt 74:
1.57 semarie 75: if (unveil(_PATH_MASTERPASSWD_LOCK, "rwc") == -1)
1.59 beck 76: err(1, "unveil %s", _PATH_MASTERPASSWD_LOCK);
1.54 mestre 77: if (unveil(_PATH_MASTERPASSWD, "r") == -1)
1.59 beck 78: err(1, "unveil %s", _PATH_MASTERPASSWD);
1.55 mestre 79: if (unveil(_PATH_LOGIN_CONF, "r") == -1)
1.59 beck 80: err(1, "unveil %s", _PATH_LOGIN_CONF);
1.57 semarie 81: if (unveil(_PATH_LOGIN_CONF ".db", "r") == -1)
1.59 beck 82: err(1, "unveil %s.db", _PATH_LOGIN_CONF);
1.63 ! robert 83: if (unveil(_PATH_LOGIN_CONF_D, "r") == -1)
! 84: err(1, "unveil %s", _PATH_LOGIN_CONF_D);
1.54 mestre 85: if (unveil(_PATH_BSHELL, "x") == -1)
1.59 beck 86: err(1, "unveil %s", _PATH_BSHELL);
1.58 anton 87: if (unveil(_PATH_SHELLS, "r") == -1)
1.59 beck 88: err(1, "unveil %s", _PATH_SHELLS);
1.54 mestre 89: if (unveil(_PATH_PWD_MKDB, "x") == -1)
1.59 beck 90: err(1, "unveil %s", _PATH_PWD_MKDB);
1.46 deraadt 91: if (pledge("stdio rpath wpath cpath getpw tty id proc exec", NULL) == -1)
92: err(1, "pledge");
93:
1.32 millert 94: if ((opw = pw_dup(pw)) == NULL) {
95: warn(NULL);
96: return(1);
97: }
1.14 millert 98: if ((lc = login_getclass(pw->pw_class)) == NULL) {
99: warnx("unable to get login class for user %s.", uname);
1.36 moritz 100: free(opw);
1.14 millert 101: return(1);
102: }
1.1 deraadt 103:
1.13 millert 104: uid = authenticated ? pw->pw_uid : getuid();
1.1 deraadt 105: if (uid && uid != pw->pw_uid) {
1.8 millert 106: warnx("login/uid mismatch, username argument required.");
1.36 moritz 107: free(opw);
1.1 deraadt 108: return(1);
109: }
110:
1.14 millert 111: /* Get the new password. */
112: pw->pw_passwd = getnewpasswd(pw, lc, authenticated);
113:
1.46 deraadt 114: if (pledge("stdio rpath wpath cpath getpw id proc exec", NULL) == -1)
115: err(1, "pledge");
116:
1.14 millert 117: /* Reset password change time based on login.conf. */
1.48 guenther 118: period = (time_t)login_getcaptime(lc, "passwordtime", 0, 0);
1.19 millert 119: if (period > 0) {
1.14 millert 120: pw->pw_change = time(NULL) + period;
1.19 millert 121: } else {
122: /*
123: * If the pw change time is the same we only need
124: * to update the spwd.db file.
125: */
126: if (pw->pw_change != 0)
127: pw->pw_change = 0;
128: else
1.20 millert 129: pwflags = _PASSWORD_SECUREONLY;
1.19 millert 130: }
1.14 millert 131:
1.15 millert 132: /* Drop user's real uid and block all signals to avoid a DoS. */
133: setuid(0);
134: sigfillset(&fullset);
135: sigdelset(&fullset, SIGINT);
136: sigprocmask(SIG_BLOCK, &fullset, NULL);
137:
1.46 deraadt 138: if (pledge("stdio rpath wpath cpath proc exec", NULL) == -1)
139: err(1, "pledge");
140:
1.15 millert 141: /* Get a lock on the passwd file and open it. */
142: pw_init();
1.21 millert 143: for (i = 1; (tfd = pw_lock(0)) == -1; i++) {
144: if (i == 4)
1.38 jsing 145: (void)fputs("Attempting to lock password file, "
1.21 millert 146: "please wait or press ^C to abort", stderr);
147: (void)signal(SIGINT, kbintr);
148: if (i % 16 == 0)
1.15 millert 149: fputc('.', stderr);
1.21 millert 150: usleep(250000);
1.15 millert 151: (void)signal(SIGINT, SIG_IGN);
152: }
1.21 millert 153: if (i >= 4)
154: fputc('\n', stderr);
1.62 deraadt 155: pfd = open(_PATH_MASTERPASSWD, O_RDONLY | O_CLOEXEC);
1.56 deraadt 156: if (pfd == -1)
1.15 millert 157: pw_error(_PATH_MASTERPASSWD, 1, 1);
158:
1.18 millert 159: /* Update master.passwd file and rebuild spwd.db. */
1.32 millert 160: pw_copy(pfd, tfd, pw, opw);
161: free(opw);
1.56 deraadt 162: if (pw_mkdb(uname, pwflags) == -1)
1.19 millert 163: pw_error(NULL, 0, 1);
1.61 robert 164:
165: fprintf(stderr, "passwd: password updated successfully\n");
1.14 millert 166:
1.1 deraadt 167: return(0);
168: }
169:
170: char *
1.26 deraadt 171: getnewpasswd(struct passwd *pw, login_cap_t *lc, int authenticated)
1.1 deraadt 172: {
1.43 tedu 173: static char hash[_PASSWORD_LEN];
1.52 tedu 174: char newpass[1024];
1.44 tedu 175: char *p, *pref;
1.11 provos 176: int tries, pwd_tries;
1.24 millert 177: sig_t saveint, savequit;
1.1 deraadt 178:
1.24 millert 179: saveint = signal(SIGINT, kbintr);
180: savequit = signal(SIGQUIT, kbintr);
1.23 millert 181:
1.13 millert 182: if (!authenticated) {
1.60 robert 183: fprintf(stderr, "Changing password for %s.\n", pw->pw_name);
1.27 millert 184: if (uid != 0 && pw->pw_passwd[0] != '\0') {
1.52 tedu 185: char oldpass[1024];
1.50 tedu 186:
187: p = readpassphrase("Old password:", oldpass,
188: sizeof(oldpass), RPP_ECHO_OFF);
1.31 millert 189: if (p == NULL || *p == '\0') {
1.60 robert 190: fprintf(stderr, "%s\n", UNCHANGED_MSG);
1.27 millert 191: pw_abort();
1.31 millert 192: exit(p == NULL ? 1 : 0);
1.27 millert 193: }
1.42 tedu 194: if (crypt_checkpass(p, pw->pw_passwd) != 0) {
1.27 millert 195: errno = EACCES;
1.51 gsoares 196: explicit_bzero(oldpass, sizeof(oldpass));
1.27 millert 197: pw_error(NULL, 1, 1);
198: }
1.51 gsoares 199: explicit_bzero(oldpass, sizeof(oldpass));
1.13 millert 200: }
1.1 deraadt 201: }
1.26 deraadt 202:
1.33 millert 203: pwd_tries = pwd_gettries(lc);
1.1 deraadt 204:
1.50 tedu 205: for (newpass[0] = '\0', tries = 0;;) {
1.52 tedu 206: char repeat[1024];
1.50 tedu 207:
208: p = readpassphrase("New password:", newpass, sizeof(newpass),
209: RPP_ECHO_OFF);
1.31 millert 210: if (p == NULL || *p == '\0') {
1.60 robert 211: fprintf(stderr, "%s\n", UNCHANGED_MSG);
1.27 millert 212: pw_abort();
1.31 millert 213: exit(p == NULL ? 1 : 0);
1.9 deraadt 214: }
215: if (strcmp(p, "s/key") == 0) {
1.60 robert 216: fprintf(stderr, "That password collides with a system feature. Choose another.\n");
1.9 deraadt 217: continue;
1.1 deraadt 218: }
1.26 deraadt 219:
1.37 deraadt 220: if ((tries++ < pwd_tries || pwd_tries == 0) &&
221: pwd_check(lc, p) == 0)
1.1 deraadt 222: continue;
1.50 tedu 223: p = readpassphrase("Retype new password:", repeat, sizeof(repeat),
224: RPP_ECHO_OFF);
1.53 millert 225: if (p != NULL && strcmp(newpass, p) == 0) {
226: explicit_bzero(repeat, sizeof(repeat));
1.1 deraadt 227: break;
1.53 millert 228: }
1.60 robert 229: fprintf(stderr, "Mismatch; try again, EOF to quit.\n");
1.53 millert 230: explicit_bzero(repeat, sizeof(repeat));
1.51 gsoares 231: explicit_bzero(newpass, sizeof(newpass));
1.1 deraadt 232: }
1.43 tedu 233:
1.24 millert 234: (void)signal(SIGINT, saveint);
235: (void)signal(SIGQUIT, savequit);
1.23 millert 236:
1.44 tedu 237: pref = login_getcapstr(lc, "localcipher", NULL, NULL);
1.50 tedu 238: if (crypt_newhash(newpass, pref, hash, sizeof(hash)) != 0) {
1.60 robert 239: fprintf(stderr, "Couldn't generate hash.\n");
1.51 gsoares 240: explicit_bzero(newpass, sizeof(newpass));
1.43 tedu 241: pw_error(NULL, 0, 0);
242: }
1.51 gsoares 243: explicit_bzero(newpass, sizeof(newpass));
1.44 tedu 244: free(pref);
1.43 tedu 245: return hash;
1.15 millert 246: }
247:
248: void
1.26 deraadt 249: kbintr(int signo)
1.15 millert 250: {
1.49 tedu 251: dprintf(STDOUT_FILENO, "\n%s\n", UNCHANGED_MSG);
1.27 millert 252: _exit(0);
1.1 deraadt 253: }
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