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/*-
* Copyright (c) 2001 Mark R V Murray
* All rights reserved.
* Copyright (c) 2001 Networks Associates Technology, Inc.
* All rights reserved.
*
* Portions of this software were developed for the FreeBSD Project by
* ThinkSec AS and NAI Labs, the Security Research Division of Network
* Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
* ("CBOSS"), as part of the DARPA CHATS research program.
*
* 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. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#define PROMPT "Password required for %s."
#define GUEST_PROMPT "Guest login ok, send your e-mail address as password."
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <syslog.h>
#include <stdarg.h>
#include <string.h>
#define PAM_SM_AUTH
#include <security/pam_appl.h>
#include <security/pam_modules.h>
#include <security/pam_mod_misc.h>
enum {
PAM_OPT_NO_ANON = PAM_OPT_STD_MAX,
PAM_OPT_IGNORE,
PAM_OPT_USERS
};
static struct opttab other_options[] = {
{ "no_anon", PAM_OPT_NO_ANON },
{ "ignore", PAM_OPT_IGNORE },
{ "users", PAM_OPT_USERS },
{ NULL, 0 }
};
static const char *anonusers[] = {"ftp", "anonymous", NULL};
/* Check if *user is in supplied *list or *anonusers[] list.
* Place username in *userret
* Return 1 if listed 0 otherwise
*/
static int
lookup(const char *user, char *list, const char **userret)
{
int anon, i;
char *item, *context, *locallist;
anon = 0;
*userret = user; /* this is the default */
if (list) {
*userret = NULL;
locallist = list;
while ((item = strtok_r(locallist, ",", &context))) {
if (*userret == NULL)
*userret = item;
if (strcmp(user, item) == 0) {
anon = 1;
break;
}
locallist = NULL;
}
}
else {
for (i = 0; anonusers[i] != NULL; i++) {
if (strcmp(anonusers[i], user) == 0) {
*userret = anonusers[0];
anon = 1;
break;
}
}
}
return anon;
}
/* Check if the user name is 'ftp' or 'anonymous'.
* If this is the case, set the PAM_RUSER to the entered email address
* and succeed, otherwise fail.
*/
PAM_EXTERN int
pam_sm_authenticate(pam_handle_t * pamh, int flags __unused,
int argc, const char *argv[])
{
struct options options;
int retval, anon;
char *users, *context, *token, *p;
const char *user, *prompt;
pam_std_option(&options, other_options, argc, argv);
PAM_LOG("Options processed");
retval = pam_get_user(pamh, &user, NULL);
if (retval != PAM_SUCCESS || user == NULL)
return (PAM_USER_UNKNOWN);
PAM_LOG("Got user: %s", user);
users = NULL;
if (pam_test_option(&options, PAM_OPT_USERS, &users))
PAM_LOG("Got extra anonymous users: %s", users);
anon = 0;
if (!pam_test_option(&options, PAM_OPT_NO_ANON, NULL))
anon = lookup(user, users, &user);
PAM_LOG("Done user: %s", user);
if (anon) {
retval = pam_set_item(pamh, PAM_USER, (const void *)user);
if (retval != PAM_SUCCESS)
return (retval);
prompt = GUEST_PROMPT;
PAM_LOG("Doing anonymous");
}
else {
prompt = PROMPT;
PAM_LOG("Doing non-anonymous");
}
retval = pam_prompt(pamh, PAM_PROMPT_ECHO_OFF, &token, "%s", prompt);
if (retval != PAM_SUCCESS)
return (PAM_AUTHINFO_UNAVAIL);
PAM_LOG("Got password");
if (anon) {
if (!pam_test_option(&options, PAM_OPT_IGNORE, NULL)) {
p = strtok_r(token, "@", &context);
if (p != NULL) {
pam_set_item(pamh, PAM_RUSER, p);
PAM_LOG("Got ruser: %s", p);
if (retval == PAM_SUCCESS) {
/* XXX XXX XXX */
p = strtok_r(NULL, "@", &context);
if (p != NULL) {
pam_set_item(pamh, PAM_RHOST, p);
PAM_LOG("Got rhost: %s", p);
}
}
}
}
else {
PAM_LOG("Ignoring supplied password structure");
}
PAM_LOG("Done anonymous");
retval = PAM_SUCCESS;
}
else {
pam_set_item(pamh, PAM_AUTHTOK, token);
PAM_VERBOSE_ERROR("Anonymous module reject");
PAM_LOG("Done non-anonymous");
retval = PAM_AUTH_ERR;
}
return (retval);
}
PAM_EXTERN int
pam_sm_setcred(pam_handle_t * pamh __unused, int flags __unused,
int argc __unused, const char *argv[] __unused)
{
return (PAM_SUCCESS);
}
PAM_MODULE_ENTRY("pam_ftp");
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