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316 lines
7.9 KiB
316 lines
7.9 KiB
/**
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* xrdp: A Remote Desktop Protocol server.
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*
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* Copyright (C) Jay Sorg 2004-2013
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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*
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* @file verify_user_pam.c
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* @brief Authenticate user using pam
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* @author Jay Sorg
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*
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*/
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#if defined(HAVE_CONFIG_H)
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#include <config_ac.h>
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#endif
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#include "arch.h"
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#include "os_calls.h"
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#include <stdio.h>
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#include <security/pam_appl.h>
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struct t_user_pass
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{
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char user[256];
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char pass[256];
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};
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struct t_auth_info
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{
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struct t_user_pass user_pass;
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int session_opened;
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int did_setcred;
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struct pam_conv pamc;
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pam_handle_t *ph;
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};
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/******************************************************************************/
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static int
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verify_pam_conv(int num_msg, const struct pam_message **msg,
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struct pam_response **resp, void *appdata_ptr)
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{
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int i;
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struct pam_response *reply;
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struct t_user_pass *user_pass;
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reply = g_new0(struct pam_response, num_msg);
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for (i = 0; i < num_msg; i++)
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{
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switch (msg[i]->msg_style)
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{
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case PAM_PROMPT_ECHO_ON: /* username */
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user_pass = (struct t_user_pass *) appdata_ptr;
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reply[i].resp = g_strdup(user_pass->user);
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reply[i].resp_retcode = PAM_SUCCESS;
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break;
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case PAM_PROMPT_ECHO_OFF: /* password */
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user_pass = (struct t_user_pass *) appdata_ptr;
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reply[i].resp = g_strdup(user_pass->pass);
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reply[i].resp_retcode = PAM_SUCCESS;
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break;
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default:
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g_printf("unknown in verify_pam_conv\r\n");
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g_free(reply);
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return PAM_CONV_ERR;
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}
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}
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*resp = reply;
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return PAM_SUCCESS;
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}
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/******************************************************************************/
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static void
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get_service_name(char *service_name)
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{
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service_name[0] = 0;
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if (g_file_exist("/etc/pam.d/xrdp-sesman"))
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{
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g_strncpy(service_name, "xrdp-sesman", 255);
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}
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else
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{
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g_strncpy(service_name, "gdm", 255);
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}
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}
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/******************************************************************************/
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/* returns long, zero is no go
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Stores the detailed error code in the errorcode variable*/
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long
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auth_userpass(const char *user, const char *pass, int *errorcode)
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{
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int error;
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struct t_auth_info *auth_info;
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char service_name[256];
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get_service_name(service_name);
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auth_info = g_new0(struct t_auth_info, 1);
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g_strncpy(auth_info->user_pass.user, user, 255);
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g_strncpy(auth_info->user_pass.pass, pass, 255);
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auth_info->pamc.conv = &verify_pam_conv;
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auth_info->pamc.appdata_ptr = &(auth_info->user_pass);
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error = pam_start(service_name, 0, &(auth_info->pamc), &(auth_info->ph));
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if (error != PAM_SUCCESS)
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{
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if (errorcode != NULL)
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{
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*errorcode = error;
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}
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g_printf("pam_start failed: %s\r\n", pam_strerror(auth_info->ph, error));
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pam_end(auth_info->ph, error);
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g_free(auth_info);
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return 0;
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}
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error = pam_set_item(auth_info->ph, PAM_TTY, service_name);
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if (error != PAM_SUCCESS)
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{
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g_printf("pam_set_item failed: %s\r\n",
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pam_strerror(auth_info->ph, error));
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}
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error = pam_authenticate(auth_info->ph, 0);
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if (error != PAM_SUCCESS)
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{
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if (errorcode != NULL)
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{
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*errorcode = error;
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}
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g_printf("pam_authenticate failed: %s\r\n",
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pam_strerror(auth_info->ph, error));
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pam_end(auth_info->ph, error);
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g_free(auth_info);
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return 0;
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}
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/* From man page:
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The pam_acct_mgmt function is used to determine if the users account is
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valid. It checks for authentication token and account expiration and
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verifies access restrictions. It is typically called after the user has
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been authenticated.
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*/
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error = pam_acct_mgmt(auth_info->ph, 0);
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if (error != PAM_SUCCESS)
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{
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if (errorcode != NULL)
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{
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*errorcode = error;
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}
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g_printf("pam_acct_mgmt failed: %s\r\n",
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pam_strerror(auth_info->ph, error));
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pam_end(auth_info->ph, error);
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g_free(auth_info);
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return 0;
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}
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return (long)auth_info;
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}
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/******************************************************************************/
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/* returns error */
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int
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auth_start_session(long in_val, int in_display)
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{
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struct t_auth_info *auth_info;
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int error;
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char display[256];
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g_sprintf(display, ":%d", in_display);
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auth_info = (struct t_auth_info *)in_val;
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error = pam_set_item(auth_info->ph, PAM_TTY, display);
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if (error != PAM_SUCCESS)
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{
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g_printf("pam_set_item failed: %s\r\n", pam_strerror(auth_info->ph, error));
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return 1;
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}
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error = pam_setcred(auth_info->ph, PAM_ESTABLISH_CRED);
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if (error != PAM_SUCCESS)
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{
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g_printf("pam_setcred failed: %s\r\n", pam_strerror(auth_info->ph, error));
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return 1;
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}
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auth_info->did_setcred = 1;
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error = pam_open_session(auth_info->ph, 0);
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if (error != PAM_SUCCESS)
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{
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g_printf("pam_open_session failed: %s\r\n",
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pam_strerror(auth_info->ph, error));
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return 1;
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}
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auth_info->session_opened = 1;
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return 0;
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}
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/******************************************************************************/
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/* returns error */
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int
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auth_stop_session(long in_val)
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{
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struct t_auth_info *auth_info;
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int error;
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auth_info = (struct t_auth_info *)in_val;
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error = pam_close_session(auth_info->ph, 0);
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if (error != PAM_SUCCESS)
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{
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g_printf("pam_close_session failed: %s\r\n",
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pam_strerror(auth_info->ph, error));
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return 1;
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}
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auth_info->session_opened = 0;
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return 0;
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}
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/******************************************************************************/
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/* returns error */
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/* cleanup */
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int
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auth_end(long in_val)
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{
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struct t_auth_info *auth_info;
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auth_info = (struct t_auth_info *)in_val;
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if (auth_info != 0)
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{
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if (auth_info->ph != 0)
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{
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if (auth_info->session_opened)
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{
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pam_close_session(auth_info->ph, 0);
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}
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if (auth_info->did_setcred)
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{
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pam_setcred(auth_info->ph, PAM_DELETE_CRED);
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}
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pam_end(auth_info->ph, PAM_SUCCESS);
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auth_info->ph = 0;
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}
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}
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g_free(auth_info);
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return 0;
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}
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/******************************************************************************/
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/* returns error */
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/* set any pam env vars */
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int
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auth_set_env(long in_val)
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{
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struct t_auth_info *auth_info;
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char **pam_envlist;
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char **pam_env;
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char item[256];
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char value[256];
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int eq_pos;
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auth_info = (struct t_auth_info *)in_val;
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if (auth_info != 0)
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{
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/* export PAM environment */
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pam_envlist = pam_getenvlist(auth_info->ph);
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if (pam_envlist != NULL)
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{
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for (pam_env = pam_envlist; *pam_env != NULL; ++pam_env)
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{
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eq_pos = g_pos(*pam_env, "=");
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if (eq_pos >= 0 && eq_pos < 250)
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{
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g_strncpy(item, *pam_env, eq_pos);
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g_strncpy(value, (*pam_env) + eq_pos + 1, 255);
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g_setenv(item, value, 1);
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}
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g_free(*pam_env);
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}
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g_free(pam_envlist);
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}
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}
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return 0;
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}
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