147 lines
4.5 KiB
C
147 lines
4.5 KiB
C
/*-
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* Copyright 2000 James Bloom
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* All rights reserved.
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* Based upon code Copyright 1998 Juniper Networks, Inc.
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* Copyright (c) 2001-2003 Networks Associates Technology, Inc.
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* All rights reserved.
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*
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* Portions of this software were 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/types.h>
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#include <opie.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#define PAM_SM_AUTH
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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 PAM_OPT_NO_FAKE_PROMPTS "no_fake_prompts"
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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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struct opie opie;
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struct passwd *pwd;
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int retval, i;
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const char *(promptstr[]) = { "%s\nPassword: ", "%s\nPassword [echo on]: "};
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char challenge[OPIE_CHALLENGE_MAX];
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char *user;
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char *response;
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int style;
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user = NULL;
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if (openpam_get_option(pamh, PAM_OPT_AUTH_AS_SELF)) {
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if ((pwd = getpwnam(getlogin())) == NULL)
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return (PAM_AUTH_ERR);
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user = pwd->pw_name;
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}
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else {
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retval = pam_get_user(pamh, (const char **)&user, 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 user: %s", user);
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/*
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* Don't call the OPIE atexit() handler when our program exits,
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* since the module has been unloaded and we will SEGV.
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*/
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opiedisableaeh();
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/*
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* If the no_fake_prompts option was given, and the user
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* doesn't have an OPIE key, just fail rather than present the
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* user with a bogus OPIE challenge.
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*/
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/* XXX generates a const warning because of incorrect prototype */
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if (opiechallenge(&opie, (char *)user, challenge) != 0 &&
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openpam_get_option(pamh, PAM_OPT_NO_FAKE_PROMPTS))
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return (PAM_AUTH_ERR);
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/*
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* It doesn't make sense to use a password that has already been
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* typed in, since we haven't presented the challenge to the user
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* yet, so clear the stored password.
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*/
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pam_set_item(pamh, PAM_AUTHTOK, NULL);
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style = PAM_PROMPT_ECHO_OFF;
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for (i = 0; i < 2; i++) {
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retval = pam_prompt(pamh, style, &response,
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promptstr[i], challenge);
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if (retval != PAM_SUCCESS) {
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opieunlock();
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return (retval);
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}
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PAM_LOG("Completed challenge %d: %s", i, response);
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if (response[0] != '\0')
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break;
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/* Second time round, echo the password */
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style = PAM_PROMPT_ECHO_ON;
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}
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pam_set_item(pamh, PAM_AUTHTOK, response);
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/*
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* Opieverify is supposed to return -1 only if an error occurs.
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* But it returns -1 even if the response string isn't in the form
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* it expects. Thus we can't log an error and can only check for
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* success or lack thereof.
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*/
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retval = opieverify(&opie, response);
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free(response);
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return (retval == 0 ? PAM_SUCCESS : 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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PAM_MODULE_ENTRY("pam_opie");
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