/* $NetBSD: local_passwd.c,v 1.36 2012/03/25 05:55:07 dholland Exp $ */ /*- * Copyright (c) 1990, 1993, 1994 * 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. 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. */ #include #ifndef lint #if 0 static char sccsid[] = "from: @(#)local_passwd.c 8.3 (Berkeley) 4/2/94"; #else __RCSID("$NetBSD: local_passwd.c,v 1.36 2012/03/25 05:55:07 dholland Exp $"); #endif #endif /* not lint */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "extern.h" static uid_t uid; static char * getnewpasswd(struct passwd *pw, int min_pw_len) { int tries; char *p, *t; char buf[_PASSWORD_LEN+1], salt[_PASSWORD_LEN+1]; char option[LINE_MAX], *key, *opt; (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; syslog(LOG_AUTH | LOG_NOTICE, "user %s (UID %lu) failed to change the " "local password of user %s: %m", pw->pw_name, (unsigned long)uid, pw->pw_name); pw_error(NULL, 1, 1); } for (buf[0] = '\0', tries = 0;;) { p = getpass("New password:"); if (!*p) { (void)printf("Password unchanged.\n"); pw_error(NULL, 0, 0); } if (min_pw_len > 0 && (int)strlen(p) < min_pw_len) { (void) printf("Password is too short.\n"); continue; } if (strlen(p) <= 5 && ++tries < 2) { (void)printf("Please enter a longer password.\n"); continue; } for (t = p; *t && islower((unsigned char)*t); ++t); if (!*t && ++tries < 2) { (void)printf("Please don't use an all-lower case " "password.\nUnusual capitalization, " "control characters or digits are " "suggested.\n"); continue; } (void)strlcpy(buf, p, sizeof(buf)); if (!strcmp(buf, getpass("Retype new password:"))) break; (void)printf("Mismatch; try again, EOF to quit.\n"); } pw_getpwconf(option, sizeof(option), pw, "localcipher"); opt = option; key = strsep(&opt, ","); if(pw_gensalt(salt, _PASSWORD_LEN, key, opt) == -1) { warn("Couldn't generate salt"); pw_error(NULL, 0, 0); } return(crypt(buf, salt)); } #ifdef USE_PAM void pwlocal_usage(const char *prefix) { (void) fprintf(stderr, "%s %s [-d files | -l] [user]\n", prefix, getprogname()); } void pwlocal_process(const char *username, int argc, char **argv) { struct passwd *pw; struct passwd old_pw; time_t old_change; int pfd, tfd; int min_pw_len = 0; int pw_expiry = 0; int ch; #ifdef LOGIN_CAP login_cap_t *lc; #endif while ((ch = getopt(argc, argv, "l")) != -1) { switch (ch) { case 'l': /* * Aborb the -l that may have gotten us here. */ break; default: usage(); /* NOTREACHED */ } } argc -= optind; argv += optind; switch (argc) { case 0: /* username already provided */ break; case 1: username = argv[0]; break; default: usage(); /* NOTREACHED */ } if (!(pw = getpwnam(username))) errx(1, "unknown user %s", username); uid = getuid(); if (uid && uid != pw->pw_uid) errx(1, "%s", strerror(EACCES)); /* Save the old pw information for comparing on pw_copy(). */ old_pw = *pw; /* * Get class restrictions for this user, then get the new password. */ #ifdef LOGIN_CAP if((lc = login_getclass(pw->pw_class)) != NULL) { min_pw_len = (int) login_getcapnum(lc, "minpasswordlen", 0, 0); pw_expiry = (int) login_getcaptime(lc, "passwordtime", 0, 0); login_close(lc); } #endif pw->pw_passwd = getnewpasswd(pw, min_pw_len); old_change = pw->pw_change; pw->pw_change = pw_expiry ? pw_expiry + time(NULL) : 0; /* * Now that the user has given us a new password, let us * change the database. */ pw_init(); tfd = pw_lock(0); if (tfd < 0) { warnx ("The passwd file is busy, waiting..."); tfd = pw_lock(10); if (tfd < 0) errx(1, "The passwd file is still busy, " "try again later."); } pfd = open(_PATH_MASTERPASSWD, O_RDONLY, 0); if (pfd < 0) pw_error(_PATH_MASTERPASSWD, 1, 1); pw_copy(pfd, tfd, pw, &old_pw); if (pw_mkdb(username, old_change == pw->pw_change) < 0) pw_error(NULL, 0, 1); syslog(LOG_AUTH | LOG_INFO, "user %s (UID %lu) successfully changed " "the local password of user %s", uid ? username : "root", (unsigned long)uid, username); } #else /* ! USE_PAM */ static int force_local; int local_init(const char *progname) { force_local = 0; return (0); } int local_arg(char ch, const char *arg) { switch (ch) { case 'l': force_local = 1; break; default: return(0); } return(1); } int local_arg_end(void) { if (force_local) return(PW_USE_FORCE); return(PW_USE); } void local_end(void) { /* NOOP */ } int local_chpw(const char *uname) { struct passwd *pw; struct passwd old_pw; time_t old_change; int pfd, tfd; int min_pw_len = 0; int pw_expiry = 0; #ifdef LOGIN_CAP login_cap_t *lc; #endif if (!(pw = getpwnam(uname))) { warnx("unknown user %s", uname); return (1); } uid = getuid(); if (uid && uid != pw->pw_uid) { warnx("%s", strerror(EACCES)); return (1); } /* Save the old pw information for comparing on pw_copy(). */ old_pw = *pw; /* * Get class restrictions for this user, then get the new password. */ #ifdef LOGIN_CAP if((lc = login_getclass(pw->pw_class))) { min_pw_len = (int) login_getcapnum(lc, "minpasswordlen", 0, 0); pw_expiry = (int) login_getcaptime(lc, "passwordtime", 0, 0); login_close(lc); } #endif pw->pw_passwd = getnewpasswd(pw, min_pw_len); old_change = pw->pw_change; pw->pw_change = pw_expiry ? pw_expiry + time(NULL) : 0; /* * Now that the user has given us a new password, let us * change the database. */ pw_init(); tfd = pw_lock(0); if (tfd < 0) { warnx ("The passwd file is busy, waiting..."); tfd = pw_lock(10); if (tfd < 0) errx(1, "The passwd file is still busy, " "try again later."); } pfd = open(_PATH_MASTERPASSWD, O_RDONLY, 0); if (pfd < 0) pw_error(_PATH_MASTERPASSWD, 1, 1); pw_copy(pfd, tfd, pw, &old_pw); if (pw_mkdb(uname, old_change == pw->pw_change) < 0) pw_error(NULL, 0, 1); syslog(LOG_AUTH | LOG_INFO, "user %s (UID %lu) successfully changed " "the local password of user %s", uid ? uname : "root", (unsigned long)uid, uname); return (0); } #endif /* USE_PAM */