/* $OpenBSD: local_passwd.c,v 1.18 2001/08/16 18:29:27 millert Exp $ */ /*- * Copyright (c) 1990 The Regents of the University of California. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #ifndef lint /*static const char sccsid[] = "from: @(#)local_passwd.c 5.5 (Berkeley) 5/6/91";*/ static const char rcsid[] = "$OpenBSD: local_passwd.c,v 1.18 2001/08/16 18:29:27 millert Exp $"; #endif /* not lint */ #include #include #include #include #include #include #include #include #include #include #include #include #include static uid_t uid; extern int pwd_gensalt __P((char *, int, struct passwd *, login_cap_t *, char)); extern int pwd_check __P((struct passwd *, login_cap_t *, char *)); extern int pwd_gettries __P((struct passwd *, login_cap_t *)); char *getnewpasswd __P((struct passwd *, login_cap_t *, int)); void kbintr __P((int)); int local_passwd(uname, authenticated) char *uname; int authenticated; { struct passwd *pw; login_cap_t *lc; sigset_t fullset; time_t period; int pfd, tfd = -1; char *s = NULL; if (!(pw = getpwnam(uname))) { #ifdef YP extern int use_yp; if (!use_yp) #endif warnx("unknown user %s.", uname); return(1); } if ((lc = login_getclass(pw->pw_class)) == NULL) { warnx("unable to get login class for user %s.", uname); return(1); } uid = authenticated ? pw->pw_uid : getuid(); if (uid && uid != pw->pw_uid) { warnx("login/uid mismatch, username argument required."); return(1); } /* Get the new password. */ pw->pw_passwd = getnewpasswd(pw, lc, authenticated); /* Reset password change time based on login.conf. */ period = login_getcaptime(lc, "passwordtime", 0, 0); if (period > 0) pw->pw_change = time(NULL) + period; else pw->pw_change = 0; /* Drop user's real uid and block all signals to avoid a DoS. */ setuid(0); sigfillset(&fullset); sigdelset(&fullset, SIGINT); sigprocmask(SIG_BLOCK, &fullset, NULL); /* Get a lock on the passwd file and open it. */ pw_init(); for (;;) { int i, c, d; for (i = 0; i < (s ? 64 : 8) && (tfd = pw_lock(0)) == -1; i++) { if (i == 0) (void)fputs("Please wait", stderr); (void)signal(SIGINT, kbintr); fputc('.', stderr); usleep(250000); (void)signal(SIGINT, SIG_IGN); } if (i) fputc('\n', stderr); if (tfd != -1) break; /* Unable to lock passwd file, let the user decide. */ if (errno == EEXIST) { if (s == NULL) s = "The passwd file is busy,"; else s = "The passwd file is still busy,"; } else s = "Unable to open passwd temp file,"; (void)fprintf(stderr, "%s do you want to wait until it is available? [y/n] ", s); (void)signal(SIGINT, kbintr); c = getchar(); (void)signal(SIGINT, SIG_IGN); if (c != '\n') while ((d = getchar()) != '\n' && d != EOF) ; if (tolower(c) != 'y') { printf("Password unchanged\n"); exit(1); } } pfd = open(_PATH_MASTERPASSWD, O_RDONLY, 0); if (pfd < 0 || fcntl(pfd, F_SETFD, 1) == -1) pw_error(_PATH_MASTERPASSWD, 1, 1); /* Update master.passwd file and rebuild spwd.db. */ pw_copy(pfd, tfd, pw); if (pw_mkdb(uname, 1) < 0) pw_error((char *)NULL, 0, 1); return(0); } char * getnewpasswd(pw, lc, authenticated) struct passwd *pw; login_cap_t *lc; int authenticated; { register char *p; int tries, pwd_tries; char buf[_PASSWORD_LEN+1], salt[_PASSWORD_LEN]; if (!authenticated) { (void)printf("Changing local password for %s.\n", pw->pw_name); if (uid && pw->pw_passwd[0] && strcmp(crypt(getpass("Old password:"), pw->pw_passwd), pw->pw_passwd)) { errno = EACCES; pw_error(NULL, 1, 1); } } pwd_tries = pwd_gettries(pw, lc); for (buf[0] = '\0', tries = 0;;) { p = getpass("New password:"); if (!*p) { (void)printf("Password unchanged.\n"); pw_error(NULL, 0, 0); } if (strcmp(p, "s/key") == 0) { printf("That password collides with a system feature. Choose another.\n"); continue; } if ((tries++ < pwd_tries || pwd_tries == 0) && pwd_check(pw, lc, p) == 0) continue; strlcpy(buf, p, sizeof(buf)); if (!strcmp(buf, getpass("Retype new password:"))) break; (void)printf("Mismatch; try again, EOF to quit.\n"); } if (!pwd_gensalt(salt, _PASSWORD_LEN, pw, lc, 'l')) { (void)printf("Couldn't generate salt.\n"); pw_error(NULL, 0, 0); } return(crypt(buf, salt)); } void kbintr(signo) int signo; { char msg[] = "\nPassword unchanged\n"; write(STDOUT_FILENO, msg, sizeof(msg) - 1); _exit(1); }