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/*
* Changed qmail-pop3 to pure-ftpd ...
*
* Program: Pluggable Authentication Modules login services
*
* Author: Michael K. Johnson
* Red Hat Software
* Internet: johnsonm@redhat.com
*
*
* This majority of this code was lifted from the src.rpm for imap
* in the RedHat-4.2 updates directory
* by Kelley Lingerfelt redhat@cococo.net
*/
#include <config.h>
#ifdef USE_PAM
# include "ftpd.h"
# include "log_pam.h"
# ifdef HAVE_SECURITY_PAM_MISC_H
# include <security/pam_misc.h>
# endif
# ifdef HAVE_SECURITY_PAM_APPL_H
# include <security/pam_appl.h>
# endif
# ifdef HAVE_SECURITY_PAM_MODULES_H
# include <security/pam_modules.h>
# endif
# ifdef HAVE_SECURITY_PAM_FILTER_H
# include <security/pam_filter.h>
# endif
# ifdef HAVE_PAM_PAM_MISC_H
# include <pam/pam_misc.h>
# endif
# ifdef HAVE_PAM_PAM_APPL_H
# include <pam/pam_appl.h>
# endif
# ifdef HAVE_PAM_PAM_MODULES_H
# include <pam/pam_modules.h>
# endif
# ifdef HAVE_PAM_PAM_FILTER_H
# include <pam/pam_filter.h>
# endif
# ifdef WITH_DMALLOC
# include <dmalloc.h>
# endif
#ifndef FTPD_PAM_SERVICE_NAME
# define FTPD_PAM_SERVICE_NAME "pure-ftpd"
#endif
/* Static variables used to communicate between the conversation function
* and the server_login function
*/
static const char *PAM_username;
static const char *PAM_password;
static int PAM_error;
/* for compatibility with older pam stuff, before the stupid transposition */
#ifndef PAM_CRED_ESTABLISH
# define PAM_CRED_ESTABLISH 0x0002U
#endif
/* PAM conversation function
* Here we assume (for now, at least) that echo on means login name, and
* echo off means password.
*/
#define GET_MEM \
size += sizeof(struct pam_response); \
if ((reply = realloc(reply, size)) == NULL) { \
PAM_error = 1; \
return PAM_CONV_ERR; \
}
static int PAM_conv(int num_msg,
const struct pam_message **msg,
struct pam_response **resp, void *appdata_ptr)
{
int count = 0;
unsigned int replies = 0U;
struct pam_response *reply = NULL;
size_t size = (size_t) 0U;
(void) appdata_ptr;
*resp = NULL;
for (count = 0; count < num_msg; count++) {
switch (msg[count]->msg_style) {
case PAM_PROMPT_ECHO_ON:
GET_MEM;
memset(&reply[replies], 0, sizeof reply[replies]);
if ((reply[replies].resp = strdup(PAM_username)) == NULL) {
#ifdef PAM_BUF_ERR
reply[replies].resp_retcode = PAM_BUF_ERR;
#endif
PAM_error = 1;
return PAM_CONV_ERR;
}
reply[replies++].resp_retcode = PAM_SUCCESS;
/* PAM frees resp */
break;
case PAM_PROMPT_ECHO_OFF:
GET_MEM;
memset(&reply[replies], 0, sizeof reply[replies]);
if ((reply[replies].resp = strdup(PAM_password)) == NULL) {
#ifdef PAM_BUF_ERR
reply[replies].resp_retcode = PAM_BUF_ERR;
#endif
PAM_error = 1;
return PAM_CONV_ERR;
}
reply[replies++].resp_retcode = PAM_SUCCESS;
/* PAM frees resp */
break;
case PAM_TEXT_INFO:
/* ignore it... */
break;
case PAM_ERROR_MSG:
default:
/* Must be an error of some sort... */
free(reply);
PAM_error = 1;
return PAM_CONV_ERR;
}
}
*resp = reply;
return PAM_SUCCESS;
}
/* Solaris throws warning about incompatible pointer types, it does not
include const on pam_message */
static struct pam_conv PAM_conversation = {
&PAM_conv, NULL
};
#define PAM_BAIL \
if (PAM_error != 0 || pam_error != PAM_SUCCESS) { \
goto bye; \
}
/* Pure-FTPd authentication module */
void pw_pam_check(AuthResult * const result,
const char *user, const char *pass,
const struct sockaddr_storage * const sa,
const struct sockaddr_storage * const peer)
{
pam_handle_t *pamh;
int pam_error;
struct passwd pw, *pw_;
char *dir = NULL;
(void) sa;
(void) peer;
result->auth_ok = 0;
PAM_password = pass;
PAM_username = user;
pam_error = pam_start(FTPD_PAM_SERVICE_NAME, user,
&PAM_conversation, &pamh);
PAM_BAIL;
# ifdef PAM_TTY
(void) pam_set_item(pamh, PAM_TTY, "pure-ftpd");
# endif
# ifdef PAM_RUSER
(void) pam_set_item(pamh, PAM_RUSER, user);
# endif
/*
* PAM doesn't make any distinction between "user not found" and
* "bad password". So we assume user not found to fallback to other
* authentication mechanisms. This is the most logical behavior.
*/
pam_error = pam_authenticate(pamh, 0);
PAM_BAIL;
pam_error = pam_acct_mgmt(pamh, 0);
PAM_BAIL;
/* If this point is reached, the user has been authenticated. */
if ((pw_ = getpwnam(user)) == NULL) {
goto bye;
}
pw = *pw_;
if ((dir = strdup(pw.pw_dir)) == NULL) {
goto bye;
}
result->auth_ok--; /* -1 */
# ifdef HAVE_INITGROUPS
(void) initgroups(pw.pw_name, pw.pw_gid);
# endif
pam_error = pam_setcred(pamh, PAM_CRED_ESTABLISH);
PAM_BAIL;
/*
* Handle session entries. PAM is instructed to shut up for now.
* 20010530 <tossu@cc.hut.fi>
*/
#ifndef WITHOUT_PAM_SESSION
(void) pam_open_session(pamh, PAM_SILENT);
(void) pam_close_session(pamh, PAM_SILENT); /* It doesn't matter if it fails */
#endif
result->dir = dir;
dir = NULL;
result->uid = pw.pw_uid;
result->gid = pw.pw_gid;
result->slow_tilde_expansion = 0;
result->auth_ok = -result->auth_ok; /* 1 */
bye:
(void) pam_end(pamh, result->auth_ok == 0 ? 0 : PAM_SUCCESS);
}
#else
extern signed char v6ready;
#endif
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