Annotation of src/usr.bin/passwd/local_passwd.c, Revision 1.39
1.39 ! djm 1: /* $OpenBSD: local_passwd.c,v 1.38 2008/04/27 10:01:53 jsing 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";*/
1.39 ! djm 34: static const char rcsid[] = "$OpenBSD: local_passwd.c,v 1.38 2008/04/27 10:01:53 jsing 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:
1.39 ! djm 60: int local_passwd(char *, int);
1.25 millert 61: char *getnewpasswd(struct passwd *, login_cap_t *, int);
62: void kbintr(int);
1.1 deraadt 63:
1.7 weingart 64: int
1.26 deraadt 65: local_passwd(char *uname, int authenticated)
1.1 deraadt 66: {
1.32 millert 67: struct passwd *pw, *opw;
1.14 millert 68: login_cap_t *lc;
1.15 millert 69: sigset_t fullset;
70: time_t period;
1.21 millert 71: int i, pfd, tfd = -1;
1.20 millert 72: int pwflags = _PASSWORD_OMITV7;
1.1 deraadt 73:
74: if (!(pw = getpwnam(uname))) {
75: #ifdef YP
76: extern int use_yp;
77: if (!use_yp)
78: #endif
1.7 weingart 79: warnx("unknown user %s.", uname);
1.1 deraadt 80: return(1);
81: }
1.32 millert 82: if ((opw = pw_dup(pw)) == NULL) {
83: warn(NULL);
84: return(1);
85: }
1.14 millert 86: if ((lc = login_getclass(pw->pw_class)) == NULL) {
87: warnx("unable to get login class for user %s.", uname);
1.36 moritz 88: free(opw);
1.14 millert 89: return(1);
90: }
1.1 deraadt 91:
1.13 millert 92: uid = authenticated ? pw->pw_uid : getuid();
1.1 deraadt 93: if (uid && uid != pw->pw_uid) {
1.8 millert 94: warnx("login/uid mismatch, username argument required.");
1.36 moritz 95: free(opw);
1.1 deraadt 96: return(1);
97: }
98:
1.14 millert 99: /* Get the new password. */
100: pw->pw_passwd = getnewpasswd(pw, lc, authenticated);
101:
102: /* Reset password change time based on login.conf. */
1.30 deraadt 103: period = (time_t)login_getcaptime(lc, "passwordtime",
104: (quad_t)0, (quad_t)0);
1.19 millert 105: if (period > 0) {
1.14 millert 106: pw->pw_change = time(NULL) + period;
1.19 millert 107: } else {
108: /*
109: * If the pw change time is the same we only need
110: * to update the spwd.db file.
111: */
112: if (pw->pw_change != 0)
113: pw->pw_change = 0;
114: else
1.20 millert 115: pwflags = _PASSWORD_SECUREONLY;
1.19 millert 116: }
1.14 millert 117:
1.15 millert 118: /* Drop user's real uid and block all signals to avoid a DoS. */
119: setuid(0);
120: sigfillset(&fullset);
121: sigdelset(&fullset, SIGINT);
122: sigprocmask(SIG_BLOCK, &fullset, NULL);
123:
124: /* Get a lock on the passwd file and open it. */
125: pw_init();
1.21 millert 126: for (i = 1; (tfd = pw_lock(0)) == -1; i++) {
127: if (i == 4)
1.38 jsing 128: (void)fputs("Attempting to lock password file, "
1.21 millert 129: "please wait or press ^C to abort", stderr);
130: (void)signal(SIGINT, kbintr);
131: if (i % 16 == 0)
1.15 millert 132: fputc('.', stderr);
1.21 millert 133: usleep(250000);
1.15 millert 134: (void)signal(SIGINT, SIG_IGN);
135: }
1.21 millert 136: if (i >= 4)
137: fputc('\n', stderr);
1.15 millert 138: pfd = open(_PATH_MASTERPASSWD, O_RDONLY, 0);
1.36 moritz 139: if (pfd < 0 || fcntl(pfd, F_SETFD, FD_CLOEXEC) == -1)
1.15 millert 140: pw_error(_PATH_MASTERPASSWD, 1, 1);
141:
1.18 millert 142: /* Update master.passwd file and rebuild spwd.db. */
1.32 millert 143: pw_copy(pfd, tfd, pw, opw);
144: free(opw);
1.20 millert 145: if (pw_mkdb(uname, pwflags) < 0)
1.19 millert 146: pw_error(NULL, 0, 1);
1.14 millert 147:
1.1 deraadt 148: return(0);
149: }
150:
151: char *
1.26 deraadt 152: getnewpasswd(struct passwd *pw, login_cap_t *lc, int authenticated)
1.1 deraadt 153: {
1.22 mpech 154: char *p;
1.11 provos 155: int tries, pwd_tries;
1.13 millert 156: char buf[_PASSWORD_LEN+1], salt[_PASSWORD_LEN];
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) {
163: (void)printf("Changing local 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') {
1.27 millert 167: (void)printf(UNCHANGED_MSG);
168: pw_abort();
1.31 millert 169: exit(p == NULL ? 1 : 0);
1.27 millert 170: }
171: if (strcmp(crypt(p, pw->pw_passwd), pw->pw_passwd)) {
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') {
1.27 millert 183: (void)printf(UNCHANGED_MSG);
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: }
1.33 millert 201: if (!pwd_gensalt(salt, _PASSWORD_LEN, lc, 'l')) {
1.6 provos 202: (void)printf("Couldn't generate salt.\n");
203: pw_error(NULL, 0, 0);
204: }
1.24 millert 205: (void)signal(SIGINT, saveint);
206: (void)signal(SIGQUIT, savequit);
1.23 millert 207:
1.1 deraadt 208: return(crypt(buf, salt));
1.15 millert 209: }
210:
1.35 deraadt 211: /* ARGSUSED */
1.15 millert 212: void
1.26 deraadt 213: kbintr(int signo)
1.15 millert 214: {
1.34 millert 215: write(STDOUT_FILENO, "\n", 1);
1.27 millert 216: write(STDOUT_FILENO, UNCHANGED_MSG, sizeof(UNCHANGED_MSG) - 1);
217: _exit(0);
1.1 deraadt 218: }
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