Annotation of src/usr.bin/passwd/local_passwd.c, Revision 1.35
1.35 ! deraadt 1: /* $OpenBSD: local_passwd.c,v 1.34 2004/07/24 16:57:43 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.
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";*/
1.35 ! deraadt 34: static const char rcsid[] = "$OpenBSD: local_passwd.c,v 1.34 2004/07/24 16:57:43 millert 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);
87: return(1);
88: }
1.1 deraadt 89:
1.13 millert 90: uid = authenticated ? pw->pw_uid : getuid();
1.1 deraadt 91: if (uid && uid != pw->pw_uid) {
1.8 millert 92: warnx("login/uid mismatch, username argument required.");
1.1 deraadt 93: return(1);
94: }
95:
1.14 millert 96: /* Get the new password. */
97: pw->pw_passwd = getnewpasswd(pw, lc, authenticated);
98:
99: /* Reset password change time based on login.conf. */
1.30 deraadt 100: period = (time_t)login_getcaptime(lc, "passwordtime",
101: (quad_t)0, (quad_t)0);
1.19 millert 102: if (period > 0) {
1.14 millert 103: pw->pw_change = time(NULL) + period;
1.19 millert 104: } else {
105: /*
106: * If the pw change time is the same we only need
107: * to update the spwd.db file.
108: */
109: if (pw->pw_change != 0)
110: pw->pw_change = 0;
111: else
1.20 millert 112: pwflags = _PASSWORD_SECUREONLY;
1.19 millert 113: }
1.14 millert 114:
1.15 millert 115: /* Drop user's real uid and block all signals to avoid a DoS. */
116: setuid(0);
117: sigfillset(&fullset);
118: sigdelset(&fullset, SIGINT);
119: sigprocmask(SIG_BLOCK, &fullset, NULL);
120:
121: /* Get a lock on the passwd file and open it. */
122: pw_init();
1.21 millert 123: for (i = 1; (tfd = pw_lock(0)) == -1; i++) {
124: if (i == 4)
125: (void)fputs("Attempting lock password file, "
126: "please wait or press ^C to abort", stderr);
127: (void)signal(SIGINT, kbintr);
128: if (i % 16 == 0)
1.15 millert 129: fputc('.', stderr);
1.21 millert 130: usleep(250000);
1.15 millert 131: (void)signal(SIGINT, SIG_IGN);
132: }
1.21 millert 133: if (i >= 4)
134: fputc('\n', stderr);
1.15 millert 135: pfd = open(_PATH_MASTERPASSWD, O_RDONLY, 0);
136: if (pfd < 0 || fcntl(pfd, F_SETFD, 1) == -1)
137: pw_error(_PATH_MASTERPASSWD, 1, 1);
138:
1.18 millert 139: /* Update master.passwd file and rebuild spwd.db. */
1.32 millert 140: pw_copy(pfd, tfd, pw, opw);
141: free(opw);
1.20 millert 142: if (pw_mkdb(uname, pwflags) < 0)
1.19 millert 143: pw_error(NULL, 0, 1);
1.14 millert 144:
1.1 deraadt 145: return(0);
146: }
147:
148: char *
1.26 deraadt 149: getnewpasswd(struct passwd *pw, login_cap_t *lc, int authenticated)
1.1 deraadt 150: {
1.22 mpech 151: char *p;
1.11 provos 152: int tries, pwd_tries;
1.13 millert 153: char buf[_PASSWORD_LEN+1], salt[_PASSWORD_LEN];
1.24 millert 154: sig_t saveint, savequit;
1.1 deraadt 155:
1.24 millert 156: saveint = signal(SIGINT, kbintr);
157: savequit = signal(SIGQUIT, kbintr);
1.23 millert 158:
1.13 millert 159: if (!authenticated) {
160: (void)printf("Changing local password for %s.\n", pw->pw_name);
1.27 millert 161: if (uid != 0 && pw->pw_passwd[0] != '\0') {
162: p = getpass("Old password:");
1.31 millert 163: if (p == NULL || *p == '\0') {
1.27 millert 164: (void)printf(UNCHANGED_MSG);
165: pw_abort();
1.31 millert 166: exit(p == NULL ? 1 : 0);
1.27 millert 167: }
168: if (strcmp(crypt(p, pw->pw_passwd), pw->pw_passwd)) {
169: errno = EACCES;
170: pw_error(NULL, 1, 1);
171: }
1.13 millert 172: }
1.1 deraadt 173: }
1.26 deraadt 174:
1.33 millert 175: pwd_tries = pwd_gettries(lc);
1.1 deraadt 176:
177: for (buf[0] = '\0', tries = 0;;) {
178: p = getpass("New password:");
1.31 millert 179: if (p == NULL || *p == '\0') {
1.27 millert 180: (void)printf(UNCHANGED_MSG);
181: pw_abort();
1.31 millert 182: exit(p == NULL ? 1 : 0);
1.9 deraadt 183: }
184: if (strcmp(p, "s/key") == 0) {
185: printf("That password collides with a system feature. Choose another.\n");
186: continue;
1.1 deraadt 187: }
1.26 deraadt 188:
1.11 provos 189: if ((tries++ < pwd_tries || pwd_tries == 0)
1.33 millert 190: && pwd_check(lc, p) == 0)
1.1 deraadt 191: continue;
1.13 millert 192: strlcpy(buf, p, sizeof(buf));
1.31 millert 193: p = getpass("Retype new password:");
194: if (p != NULL && strcmp(buf, p) == 0)
1.1 deraadt 195: break;
196: (void)printf("Mismatch; try again, EOF to quit.\n");
197: }
1.33 millert 198: if (!pwd_gensalt(salt, _PASSWORD_LEN, lc, 'l')) {
1.6 provos 199: (void)printf("Couldn't generate salt.\n");
200: pw_error(NULL, 0, 0);
201: }
1.24 millert 202: (void)signal(SIGINT, saveint);
203: (void)signal(SIGQUIT, savequit);
1.23 millert 204:
1.1 deraadt 205: return(crypt(buf, salt));
1.15 millert 206: }
207:
1.35 ! deraadt 208: /* ARGSUSED */
1.15 millert 209: void
1.26 deraadt 210: kbintr(int signo)
1.15 millert 211: {
1.34 millert 212: write(STDOUT_FILENO, "\n", 1);
1.27 millert 213: write(STDOUT_FILENO, UNCHANGED_MSG, sizeof(UNCHANGED_MSG) - 1);
214: _exit(0);
1.1 deraadt 215: }
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