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/*
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
xrdp: A Remote Desktop Protocol server.
Copyright (C) Jay Sorg 2005-2008
*/
/**
*
* @file verify_user_pam.c
* @brief Authenticate user using pam
* @author Jay Sorg
*
*/
#include "arch.h"
#include "os_calls.h"
#include <stdio.h>
#include <security/pam_appl.h>
struct t_user_pass
{
char user[256];
char pass[256];
};
struct t_auth_info
{
struct t_user_pass user_pass;
int session_opened;
int did_setcred;
struct pam_conv pamc;
pam_handle_t* ph;
};
/******************************************************************************/
static int DEFAULT_CC
verify_pam_conv(int num_msg, const struct pam_message** msg,
struct pam_response** resp, void* appdata_ptr)
{
int i;
struct pam_response* reply;
struct t_user_pass* user_pass;
reply = g_malloc(sizeof(struct pam_response) * num_msg, 1);
for (i = 0; i < num_msg; i++)
{
switch (msg[i]->msg_style)
{
case PAM_PROMPT_ECHO_ON: /* username */
user_pass = appdata_ptr;
reply[i].resp = g_strdup(user_pass->user);
reply[i].resp_retcode = PAM_SUCCESS;
break;
case PAM_PROMPT_ECHO_OFF: /* password */
user_pass = appdata_ptr;
reply[i].resp = g_strdup(user_pass->pass);
reply[i].resp_retcode = PAM_SUCCESS;
break;
default:
g_printf("unknown in verify_pam_conv\r\n");
g_free(reply);
return PAM_CONV_ERR;
}
}
*resp = reply;
return PAM_SUCCESS;
}
/******************************************************************************/
static void DEFAULT_CC
get_service_name(char* service_name)
{
service_name[0] = 0;
if (g_file_exist("/etc/pam.d/xrdp-sesman"))
{
g_strncpy(service_name, "xrdp-sesman", 255);
}
else
{
g_strncpy(service_name, "gdm", 255);
}
}
/******************************************************************************/
/* returns long, zero is no go */
long DEFAULT_CC
auth_userpass(char* user, char* pass)
{
int error;
struct t_auth_info* auth_info;
char service_name[256];
get_service_name(service_name);
auth_info = g_malloc(sizeof(struct t_auth_info), 1);
g_strncpy(auth_info->user_pass.user, user, 255);
g_strncpy(auth_info->user_pass.pass, pass, 255);
auth_info->pamc.conv = &verify_pam_conv;
auth_info->pamc.appdata_ptr = &(auth_info->user_pass);
error = pam_start(service_name, 0, &(auth_info->pamc), &(auth_info->ph));
if (error != PAM_SUCCESS)
{
g_printf("pam_start failed: %s\r\n", pam_strerror(auth_info->ph, error));
g_free(auth_info);
return 0;
}
error = pam_authenticate(auth_info->ph, 0);
if (error != PAM_SUCCESS)
{
g_printf("pam_authenticate failed: %s\r\n",
pam_strerror(auth_info->ph, error));
g_free(auth_info);
return 0;
}
error = pam_acct_mgmt(auth_info->ph, 0);
if (error != PAM_SUCCESS)
{
g_printf("pam_acct_mgmt failed: %s\r\n",
pam_strerror(auth_info->ph, error));
g_free(auth_info);
return 0;
}
return (long)auth_info;
}
/******************************************************************************/
/* returns error */
int DEFAULT_CC
auth_start_session(long in_val, int in_display)
{
struct t_auth_info* auth_info;
int error;
char display[256];
g_sprintf(display, ":%d", in_display);
auth_info = (struct t_auth_info*)in_val;
error = pam_set_item(auth_info->ph, PAM_TTY, display);
if (error != PAM_SUCCESS)
{
g_printf("pam_set_item failed: %s\r\n", pam_strerror(auth_info->ph, error));
return 1;
}
error = pam_setcred(auth_info->ph, PAM_ESTABLISH_CRED);
if (error != PAM_SUCCESS)
{
g_printf("pam_setcred failed: %s\r\n", pam_strerror(auth_info->ph, error));
return 1;
}
auth_info->did_setcred = 1;
error = pam_open_session(auth_info->ph, 0);
if (error != PAM_SUCCESS)
{
g_printf("pam_open_session failed: %s\r\n",
pam_strerror(auth_info->ph, error));
return 1;
}
auth_info->session_opened = 1;
return 0;
}
/******************************************************************************/
/* returns error */
/* cleanup */
int DEFAULT_CC
auth_end(long in_val)
{
struct t_auth_info* auth_info;
auth_info = (struct t_auth_info*)in_val;
if (auth_info != 0)
{
if (auth_info->ph != 0)
{
if (auth_info->session_opened)
{
pam_close_session(auth_info->ph, 0);
}
if (auth_info->did_setcred)
{
pam_setcred(auth_info->ph, PAM_DELETE_CRED);
}
pam_end(auth_info->ph, PAM_SUCCESS);
auth_info->ph = 0;
}
}
g_free(auth_info);
return 0;
}
/******************************************************************************/
/* returns error */
/* set any pam env vars */
int DEFAULT_CC
auth_set_env(long in_val)
{
struct t_auth_info* auth_info;
char** pam_envlist;
char** pam_env;
char item[256];
char value[256];
int eq_pos;
auth_info = (struct t_auth_info*)in_val;
if (auth_info != 0)
{
/* export PAM environment */
pam_envlist = pam_getenvlist(auth_info->ph);
if (pam_envlist != NULL)
{
for (pam_env = pam_envlist; *pam_env != NULL; ++pam_env)
{
eq_pos = g_pos(*pam_env, "=");
if (eq_pos >= 0 && eq_pos < 250)
{
g_strncpy(item, *pam_env, eq_pos);
g_strncpy(value, (*pam_env) + eq_pos + 1, 255);
g_setenv(item, value, 1);
}
g_free(*pam_env);
}
g_free(pam_envlist);
}
}
return 0;
}
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