5e53a4f90f
Mainly focus on files that use BSD 2-Clause license, however the tool I was using mis-identified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts.
486 lines
13 KiB
C
486 lines
13 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright 1998 Juniper Networks, Inc.
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* All rights reserved.
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* Copyright (c) 2002-2003 Networks Associates Technology, Inc.
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* All rights reserved.
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*
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* Portions of this software was developed for the FreeBSD Project by
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* ThinkSec AS and NAI Labs, the Security Research Division of Network
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* Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
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* ("CBOSS"), as part of the DARPA CHATS research program.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <login_cap.h>
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#include <netdb.h>
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#include <pwd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <syslog.h>
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#include <time.h>
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#include <unistd.h>
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#include <libutil.h>
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#ifdef YP
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#include <ypclnt.h>
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#endif
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#define PAM_SM_AUTH
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#define PAM_SM_ACCOUNT
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#define PAM_SM_PASSWORD
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#include <security/pam_appl.h>
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#include <security/pam_modules.h>
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#include <security/pam_mod_misc.h>
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#define PASSWORD_HASH "md5"
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#define DEFAULT_WARN (2L * 7L * 86400L) /* Two weeks */
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#define SALTSIZE 32
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#define LOCKED_PREFIX "*LOCKED*"
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#define LOCKED_PREFIX_LEN (sizeof(LOCKED_PREFIX) - 1)
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static void makesalt(char []);
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static char password_hash[] = PASSWORD_HASH;
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#define PAM_OPT_LOCAL_PASS "local_pass"
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#define PAM_OPT_NIS_PASS "nis_pass"
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/*
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* authentication management
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*/
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PAM_EXTERN int
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pam_sm_authenticate(pam_handle_t *pamh, int flags __unused,
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int argc __unused, const char *argv[] __unused)
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{
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login_cap_t *lc;
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struct passwd *pwd;
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int retval;
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const char *pass, *user, *realpw, *prompt;
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if (openpam_get_option(pamh, PAM_OPT_AUTH_AS_SELF)) {
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user = getlogin();
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} else {
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retval = pam_get_user(pamh, &user, NULL);
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if (retval != PAM_SUCCESS)
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return (retval);
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}
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pwd = getpwnam(user);
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PAM_LOG("Got user: %s", user);
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if (pwd != NULL) {
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PAM_LOG("Doing real authentication");
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realpw = pwd->pw_passwd;
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if (realpw[0] == '\0') {
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if (!(flags & PAM_DISALLOW_NULL_AUTHTOK) &&
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openpam_get_option(pamh, PAM_OPT_NULLOK))
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return (PAM_SUCCESS);
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PAM_LOG("Password is empty, using fake password");
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realpw = "*";
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}
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lc = login_getpwclass(pwd);
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} else {
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PAM_LOG("Doing dummy authentication");
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realpw = "*";
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lc = login_getclass(NULL);
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}
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prompt = login_getcapstr(lc, "passwd_prompt", NULL, NULL);
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retval = pam_get_authtok(pamh, PAM_AUTHTOK, &pass, prompt);
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login_close(lc);
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if (retval != PAM_SUCCESS)
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return (retval);
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PAM_LOG("Got password");
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if (strnlen(pass, _PASSWORD_LEN + 1) > _PASSWORD_LEN) {
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PAM_LOG("Password is too long, using fake password");
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realpw = "*";
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}
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if (strcmp(crypt(pass, realpw), realpw) == 0)
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return (PAM_SUCCESS);
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PAM_VERBOSE_ERROR("UNIX authentication refused");
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return (PAM_AUTH_ERR);
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}
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PAM_EXTERN int
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pam_sm_setcred(pam_handle_t *pamh __unused, int flags __unused,
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int argc __unused, const char *argv[] __unused)
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{
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return (PAM_SUCCESS);
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}
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/*
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* account management
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*/
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PAM_EXTERN int
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pam_sm_acct_mgmt(pam_handle_t *pamh, int flags __unused,
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int argc __unused, const char *argv[] __unused)
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{
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struct addrinfo hints, *res;
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struct passwd *pwd;
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struct timeval tp;
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login_cap_t *lc;
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time_t warntime;
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int retval;
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const char *user;
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const void *rhost, *tty;
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char rhostip[MAXHOSTNAMELEN] = "";
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retval = pam_get_user(pamh, &user, NULL);
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if (retval != PAM_SUCCESS)
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return (retval);
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if (user == NULL || (pwd = getpwnam(user)) == NULL)
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return (PAM_SERVICE_ERR);
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PAM_LOG("Got user: %s", user);
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retval = pam_get_item(pamh, PAM_RHOST, &rhost);
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if (retval != PAM_SUCCESS)
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return (retval);
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retval = pam_get_item(pamh, PAM_TTY, &tty);
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if (retval != PAM_SUCCESS)
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return (retval);
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if (*pwd->pw_passwd == '\0' &&
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(flags & PAM_DISALLOW_NULL_AUTHTOK) != 0)
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return (PAM_NEW_AUTHTOK_REQD);
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if (strncmp(pwd->pw_passwd, LOCKED_PREFIX, LOCKED_PREFIX_LEN) == 0)
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return (PAM_AUTH_ERR);
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lc = login_getpwclass(pwd);
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if (lc == NULL) {
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PAM_LOG("Unable to get login class for user %s", user);
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return (PAM_SERVICE_ERR);
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}
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PAM_LOG("Got login_cap");
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if (pwd->pw_change || pwd->pw_expire)
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gettimeofday(&tp, NULL);
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/*
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* Check pw_expire before pw_change - no point in letting the
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* user change the password on an expired account.
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*/
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if (pwd->pw_expire) {
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warntime = login_getcaptime(lc, "warnexpire",
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DEFAULT_WARN, DEFAULT_WARN);
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if (tp.tv_sec >= pwd->pw_expire) {
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login_close(lc);
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return (PAM_ACCT_EXPIRED);
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} else if (pwd->pw_expire - tp.tv_sec < warntime &&
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(flags & PAM_SILENT) == 0) {
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pam_error(pamh, "Warning: your account expires on %s",
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ctime(&pwd->pw_expire));
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}
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}
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retval = PAM_SUCCESS;
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if (pwd->pw_change) {
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warntime = login_getcaptime(lc, "warnpassword",
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DEFAULT_WARN, DEFAULT_WARN);
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if (tp.tv_sec >= pwd->pw_change) {
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retval = PAM_NEW_AUTHTOK_REQD;
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} else if (pwd->pw_change - tp.tv_sec < warntime &&
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(flags & PAM_SILENT) == 0) {
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pam_error(pamh, "Warning: your password expires on %s",
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ctime(&pwd->pw_change));
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}
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}
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/*
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* From here on, we must leave retval untouched (unless we
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* know we're going to fail), because we need to remember
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* whether we're supposed to return PAM_SUCCESS or
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* PAM_NEW_AUTHTOK_REQD.
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*/
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if (rhost && *(const char *)rhost != '\0') {
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memset(&hints, 0, sizeof(hints));
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hints.ai_family = AF_UNSPEC;
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if (getaddrinfo(rhost, NULL, &hints, &res) == 0) {
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getnameinfo(res->ai_addr, res->ai_addrlen,
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rhostip, sizeof(rhostip), NULL, 0,
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NI_NUMERICHOST);
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}
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if (res != NULL)
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freeaddrinfo(res);
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}
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/*
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* Check host / tty / time-of-day restrictions
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*/
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if (!auth_hostok(lc, rhost, rhostip) ||
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!auth_ttyok(lc, tty) ||
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!auth_timeok(lc, time(NULL)))
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retval = PAM_AUTH_ERR;
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login_close(lc);
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return (retval);
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}
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/*
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* password management
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*
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* standard Unix and NIS password changing
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*/
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PAM_EXTERN int
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pam_sm_chauthtok(pam_handle_t *pamh, int flags,
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int argc __unused, const char *argv[] __unused)
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{
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#ifdef YP
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struct ypclnt *ypclnt;
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const void *yp_domain, *yp_server;
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#endif
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char salt[SALTSIZE + 1];
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login_cap_t *lc;
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struct passwd *pwd, *old_pwd;
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const char *user, *old_pass, *new_pass;
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char *encrypted;
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time_t passwordtime;
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int pfd, tfd, retval;
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if (openpam_get_option(pamh, PAM_OPT_AUTH_AS_SELF))
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user = getlogin();
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else {
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retval = pam_get_user(pamh, &user, NULL);
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if (retval != PAM_SUCCESS)
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return (retval);
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}
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pwd = getpwnam(user);
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if (pwd == NULL)
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return (PAM_AUTHTOK_RECOVERY_ERR);
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PAM_LOG("Got user: %s", user);
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if (flags & PAM_PRELIM_CHECK) {
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PAM_LOG("PRELIM round");
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if (getuid() == 0 &&
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(pwd->pw_fields & _PWF_SOURCE) == _PWF_FILES)
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/* root doesn't need the old password */
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return (pam_set_item(pamh, PAM_OLDAUTHTOK, ""));
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#ifdef YP
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if (getuid() == 0 &&
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(pwd->pw_fields & _PWF_SOURCE) == _PWF_NIS) {
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yp_domain = yp_server = NULL;
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(void)pam_get_data(pamh, "yp_domain", &yp_domain);
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(void)pam_get_data(pamh, "yp_server", &yp_server);
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ypclnt = ypclnt_new(yp_domain, "passwd.byname", yp_server);
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if (ypclnt == NULL)
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return (PAM_BUF_ERR);
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if (ypclnt_connect(ypclnt) == -1) {
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ypclnt_free(ypclnt);
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return (PAM_SERVICE_ERR);
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}
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retval = ypclnt_havepasswdd(ypclnt);
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ypclnt_free(ypclnt);
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if (retval == 1)
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return (pam_set_item(pamh, PAM_OLDAUTHTOK, ""));
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else if (retval == -1)
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return (PAM_SERVICE_ERR);
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}
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#endif
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if (pwd->pw_passwd[0] == '\0'
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&& openpam_get_option(pamh, PAM_OPT_NULLOK)) {
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/*
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* No password case. XXX Are we giving too much away
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* by not prompting for a password?
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* XXX check PAM_DISALLOW_NULL_AUTHTOK
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*/
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old_pass = "";
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retval = PAM_SUCCESS;
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} else {
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retval = pam_get_authtok(pamh,
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PAM_OLDAUTHTOK, &old_pass, NULL);
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if (retval != PAM_SUCCESS)
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return (retval);
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}
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PAM_LOG("Got old password");
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/* always encrypt first */
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encrypted = crypt(old_pass, pwd->pw_passwd);
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if (old_pass[0] == '\0' &&
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!openpam_get_option(pamh, PAM_OPT_NULLOK))
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return (PAM_PERM_DENIED);
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if (strcmp(encrypted, pwd->pw_passwd) != 0)
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return (PAM_PERM_DENIED);
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}
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else if (flags & PAM_UPDATE_AUTHTOK) {
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PAM_LOG("UPDATE round");
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retval = pam_get_authtok(pamh,
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PAM_OLDAUTHTOK, &old_pass, NULL);
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if (retval != PAM_SUCCESS)
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return (retval);
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PAM_LOG("Got old password");
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/* get new password */
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for (;;) {
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retval = pam_get_authtok(pamh,
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PAM_AUTHTOK, &new_pass, NULL);
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if (retval != PAM_TRY_AGAIN)
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break;
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pam_error(pamh, "Mismatch; try again, EOF to quit.");
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}
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PAM_LOG("Got new password");
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if (retval != PAM_SUCCESS) {
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PAM_VERBOSE_ERROR("Unable to get new password");
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return (retval);
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}
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if (getuid() != 0 && new_pass[0] == '\0' &&
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!openpam_get_option(pamh, PAM_OPT_NULLOK))
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return (PAM_PERM_DENIED);
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if ((old_pwd = pw_dup(pwd)) == NULL)
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return (PAM_BUF_ERR);
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lc = login_getclass(pwd->pw_class);
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if (login_setcryptfmt(lc, password_hash, NULL) == NULL)
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openpam_log(PAM_LOG_ERROR,
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"can't set password cipher, relying on default");
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/* set password expiry date */
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pwd->pw_change = 0;
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passwordtime = login_getcaptime(lc, "passwordtime", 0, 0);
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if (passwordtime > 0)
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pwd->pw_change = time(NULL) + passwordtime;
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login_close(lc);
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makesalt(salt);
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pwd->pw_passwd = crypt(new_pass, salt);
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#ifdef YP
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switch (old_pwd->pw_fields & _PWF_SOURCE) {
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case _PWF_FILES:
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#endif
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retval = PAM_SERVICE_ERR;
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if (pw_init(NULL, NULL))
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openpam_log(PAM_LOG_ERROR, "pw_init() failed");
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else if ((pfd = pw_lock()) == -1)
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openpam_log(PAM_LOG_ERROR, "pw_lock() failed");
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else if ((tfd = pw_tmp(-1)) == -1)
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openpam_log(PAM_LOG_ERROR, "pw_tmp() failed");
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else if (pw_copy(pfd, tfd, pwd, old_pwd) == -1)
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openpam_log(PAM_LOG_ERROR, "pw_copy() failed");
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else if (pw_mkdb(pwd->pw_name) == -1)
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openpam_log(PAM_LOG_ERROR, "pw_mkdb() failed");
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else
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retval = PAM_SUCCESS;
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pw_fini();
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#ifdef YP
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break;
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case _PWF_NIS:
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yp_domain = yp_server = NULL;
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(void)pam_get_data(pamh, "yp_domain", &yp_domain);
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(void)pam_get_data(pamh, "yp_server", &yp_server);
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ypclnt = ypclnt_new(yp_domain,
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"passwd.byname", yp_server);
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if (ypclnt == NULL) {
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retval = PAM_BUF_ERR;
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} else if (ypclnt_connect(ypclnt) == -1 ||
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ypclnt_passwd(ypclnt, pwd, old_pass) == -1) {
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openpam_log(PAM_LOG_ERROR, "%s", ypclnt->error);
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retval = PAM_SERVICE_ERR;
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} else {
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retval = PAM_SUCCESS;
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}
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ypclnt_free(ypclnt);
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break;
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default:
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openpam_log(PAM_LOG_ERROR, "unsupported source 0x%x",
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pwd->pw_fields & _PWF_SOURCE);
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retval = PAM_SERVICE_ERR;
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}
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#endif
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free(old_pwd);
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}
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else {
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/* Very bad juju */
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retval = PAM_ABORT;
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PAM_LOG("Illegal 'flags'");
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}
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return (retval);
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}
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/* Mostly stolen from passwd(1)'s local_passwd.c - markm */
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static unsigned char itoa64[] = /* 0 ... 63 => ascii - 64 */
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"./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
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static void
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to64(char *s, long v, int n)
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{
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while (--n >= 0) {
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*s++ = itoa64[v&0x3f];
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v >>= 6;
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}
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}
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/* Salt suitable for traditional DES and MD5 */
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static void
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makesalt(char salt[SALTSIZE + 1])
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{
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int i;
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/* These are not really random numbers, they are just
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* numbers that change to thwart construction of a
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* dictionary.
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*/
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for (i = 0; i < SALTSIZE; i += 4)
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to64(&salt[i], arc4random(), 4);
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salt[SALTSIZE] = '\0';
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}
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PAM_MODULE_ENTRY("pam_unix");
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