185 lines
4.9 KiB
C
185 lines
4.9 KiB
C
/*-
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* Copyright (c) 2012-2013 Universitetet i Oslo
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* All rights reserved.
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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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* $Id$
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <limits.h>
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#include <pwd.h>
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#include <stdint.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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#define PAM_SM_AUTH
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#define PAM_SM_ACCOUNT
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#include <security/pam_modules.h>
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#include <security/pam_appl.h>
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#include <security/oath.h>
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#define PAM_OATH_PROMPT "Verification code: "
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enum pam_oath_nokey { nokey_error = -1, nokey_fail, nokey_fake, nokey_ignore };
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static enum pam_oath_nokey
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get_nokey_option(pam_handle_t *pamh, const char *option)
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{
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const char *value;
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if ((value = openpam_get_option(pamh, option)) == NULL)
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return (nokey_fail);
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else if (strcmp(value, "fail") == 0)
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return (nokey_fail);
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else if (strcmp(value, "fake") == 0)
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return (nokey_fake);
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else if (strcmp(value, "ignore") == 0)
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return (nokey_ignore);
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openpam_log(PAM_LOG_ERROR, "the value of the %s option "
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"must be either 'fail', 'fake' or 'ignore'", option);
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return (nokey_error);
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}
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PAM_EXTERN int
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pam_sm_authenticate(pam_handle_t *pamh, int flags,
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int argc, const char *argv[])
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{
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enum pam_oath_nokey nokey, badkey;
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struct passwd *pwd;
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const char *user;
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char *keyfile;
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struct oath_key *key;
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unsigned long response;
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char *password, *end;
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int pam_err, ret;
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/* unused */
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(void)flags;
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(void)argc;
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(void)argv;
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/* check how to behave if the user does not have a valid key */
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if ((nokey = get_nokey_option(pamh, "nokey")) == nokey_error ||
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(badkey = get_nokey_option(pamh, "badkey")) == nokey_error)
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return (PAM_SERVICE_ERR);
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/* identify user */
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if ((pam_err = pam_get_user(pamh, &user, NULL)) != PAM_SUCCESS)
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return (pam_err);
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if ((pwd = getpwnam(user)) == NULL)
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return (PAM_USER_UNKNOWN);
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/* load key */
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/* XXX implement additional schemes */
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keyfile = calloc(1, strlen(pwd->pw_dir) + sizeof "/.otpauth");
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if (keyfile == NULL)
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return (PAM_SYSTEM_ERR);
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sprintf(keyfile, "%s/.otpauth", pwd->pw_dir);
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key = oath_key_from_file(keyfile);
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free(keyfile);
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/*
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* The user doesn't have a key, should we fake it?
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*
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* XXX implement badkey - currently, oath_key_from_file() doesn't
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* provide enough information for us to tell the difference
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* between a bad key and no key at all.
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*/
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if (key == NULL) {
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switch (nokey) {
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case nokey_fail:
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return (PAM_AUTHINFO_UNAVAIL);
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case nokey_fake:
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key = oath_dummy_key(om_hotp, oh_sha1, 6);
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break;
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case nokey_ignore:
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return (PAM_IGNORE);
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default:
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/* can't happen */
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return (PAM_SERVICE_ERR);
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}
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}
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/* get user's response */
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pam_err = pam_get_authtok(pamh, PAM_AUTHTOK,
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(const char **)&password, PAM_OATH_PROMPT);
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if (pam_err != PAM_SUCCESS) {
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oath_key_free(key);
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return (pam_err);
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}
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/* convert to number */
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response = strtoul(password, &end, 10);
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if (end == password || *end != '\0')
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response = ULONG_MAX;
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/* verify response */
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if (key->mode == om_hotp)
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ret = oath_hotp_match(key, response, 1);
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else
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ret = oath_totp_match(key, response, 1);
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oath_key_free(key);
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if (ret != 1)
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return (PAM_AUTH_ERR);
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/* XXX write back */
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return (PAM_SUCCESS);
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}
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PAM_EXTERN int
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pam_sm_setcred(pam_handle_t *pamh, int flags,
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int argc, const char *argv[])
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{
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/* unused */
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(void)pamh;
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(void)flags;
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(void)argc;
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(void)argv;
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return (PAM_SUCCESS);
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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,
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int argc, const char *argv[])
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{
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/* unused */
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(void)pamh;
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(void)flags;
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(void)argc;
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(void)argv;
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return (PAM_SUCCESS);
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}
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PAM_MODULE_ENTRY("pam_unix");
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