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/*-
* Copyright (c) 2001 Mark R V Murray
* 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.
*
* 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.
*
* $FreeBSD$
*/
#define PLEASE_ENTER_PASSWORD "Password required for %s."
#define GUEST_LOGIN_PROMPT "Guest login ok, send your e-mail address as password."
/* the following is a password that "can't be correct" */
#define BLOCK_PASSWORD "\177BAD PASSWPRD\177"
#include <security/_pam_aconf.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <syslog.h>
#include <stdarg.h>
#include <string.h>
/* here, we make a definition for the externally accessible function in this
* file (this definition is required for static a module but strongly
* encouraged generally) it is used to instruct the modules include file to
* define the function prototypes. */
#define PAM_SM_AUTH
#include <security/pam_modules.h>
#include <pam_mod_misc.h>
#include <security/_pam_macros.h>
static int
converse(pam_handle_t *pamh, int nargs, struct pam_message **message,
struct pam_response **response)
{
struct pam_conv *conv;
int retval;
retval = pam_get_item(pamh, PAM_CONV, (const void **)&conv);
if (retval == PAM_SUCCESS)
retval = conv->conv(nargs, (const struct pam_message **)message,
response, conv->appdata_ptr);
return retval;
}
static const char *anonusers[] = {"ftp", "anonymous", NULL};
/* Check if name is in list or default list.
* Place user's name in *user
* Return 1 if listed 0 otherwise
*/
static int
lookup(const char *name, char *list, const char **user)
{
int anon, i;
char *item, *context, *locallist;
anon = 0;
*user = name; /* this is the default */
if (list) {
locallist = list;
while ((item = strtok_r(locallist, ",", &context))) {
locallist = NULL;
if (strcmp(name, item) == 0) {
*user = item;
anon = 1;
break;
}
}
}
else {
for (i = 0; anonusers[i] != NULL; i++) {
if (strcmp(anonusers[i], name) == 0) {
*user = anonusers[0];
anon = 1;
break;
}
}
}
return anon;
}
/* --- authentication management functions (only) --- */
/* 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, int argc, const char **argv)
{
struct pam_message msg[1], *mesg[1];
struct pam_response *resp;
int retval, anon, options, i;
const char *user, *token;
char *users, *context, *prompt;
users = prompt = NULL;
options = 0;
for (i = 0; i < argc; i++)
pam_std_option(&options, argv[i]);
retval = pam_get_user(pamh, &user, NULL);
if (retval != PAM_SUCCESS || user == NULL)
return PAM_USER_UNKNOWN;
anon = 0;
if (!(options & PAM_OPT_NO_ANON))
anon = lookup(user, users, &user);
if (anon) {
retval = pam_set_item(pamh, PAM_USER, (const void *)user);
if (retval != PAM_SUCCESS || user == NULL)
return PAM_USER_UNKNOWN;
}
/* Require an email address for user's password. */
if (!anon) {
prompt = malloc(strlen(PLEASE_ENTER_PASSWORD) + strlen(user));
if (prompt == NULL)
return PAM_BUF_ERR;
else {
sprintf(prompt, PLEASE_ENTER_PASSWORD, user);
msg[0].msg = prompt;
}
}
else
msg[0].msg = GUEST_LOGIN_PROMPT;
msg[0].msg_style = PAM_PROMPT_ECHO_OFF;
mesg[0] = &msg[0];
resp = NULL;
retval = converse(pamh, 1, mesg, &resp);
if (prompt) {
_pam_overwrite(prompt);
_pam_drop(prompt);
}
if (retval != PAM_SUCCESS) {
if (resp != NULL)
_pam_drop_reply(resp, 1);
return retval == PAM_CONV_AGAIN
? PAM_INCOMPLETE : PAM_AUTHINFO_UNAVAIL;
}
if (anon) {
if (!(options & PAM_OPT_IGNORE)) {
token = strtok_r(resp->resp, "@", &context);
pam_set_item(pamh, PAM_RUSER, token);
if ((token) && (retval == PAM_SUCCESS)) {
token = strtok_r(NULL, "@", &context);
pam_set_item(pamh, PAM_RHOST, token);
}
}
retval = PAM_SUCCESS;
}
else {
pam_set_item(pamh, PAM_AUTHTOK, resp->resp);
retval = PAM_AUTH_ERR;
}
if (resp)
_pam_drop_reply(resp, i);
return retval;
}
PAM_EXTERN int
pam_sm_setcred(pam_handle_t * pamh, int flags, int argc, const char **argv)
{
return PAM_IGNORE;
}
/* end of module definition */
PAM_MODULE_ENTRY("pam_ftp");
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