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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* Copyright (C) 2023, KylinSoft Co., Ltd.
*
* 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 3, 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, see <http://www.gnu.org/licenses/>.
*
**/
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <wait.h>
#include <fcntl.h>
#include <security/pam_appl.h>
#include <sys/mman.h>
static int toParent = 0;
static int fromChild = 0;
typedef struct pam_message PAM_MESSAGE;
typedef struct pam_response PAM_RESPONSE;
static void
writeData(int fd, const void *buf, ssize_t count)
{
if(write(fd, buf, count) != count)
printf("write to parent failed: %s\n",strerror(errno));
}
static void
writeString(int fd, const char *data)
{
int length = data ? strlen(data) : -1;
writeData(fd, &length, sizeof(length));
if(data)
writeData(fd, data, sizeof(char) * length);
}
static int
readData(int fd, void *buf, size_t count)
{
ssize_t nRead = read(fd, buf, count);
if(nRead < 0)
printf("read data failed: %s\n",strerror(errno));
return nRead;
}
static char *
readString(int fd)
{
int length;
if(readData(fd, &length, sizeof(length)) <= 0)
return NULL;
if(length <= 0)
return NULL;
char *value = (char *)malloc(sizeof(char) * (length + 1));
readData(fd, value, length);
value[length] = '\0';
return value;
}
static int
pam_conversation(int msgLength, const struct pam_message **msg,
PAM_RESPONSE **resp, void */*appData*/)
{
PAM_RESPONSE *response = (PAM_RESPONSE*)calloc(msgLength,sizeof(PAM_RESPONSE));
int authComplete = 0;
writeData(toParent, (const void*)&authComplete, sizeof(authComplete));
writeData(toParent, (const void*)&msgLength, sizeof(msgLength));
//发送pam消息
for(int i = 0; i < msgLength; i++)
{
const struct pam_message *m = msg[i];
writeData(toParent, (const void *)&m->msg_style, sizeof(m->msg_style));
writeString(toParent, m->msg);
}
//读取响应
for(int i = 0; i < msgLength; i++)
{
PAM_RESPONSE *r = &response[i];
readData(fromChild, &r->resp_retcode, sizeof(r->resp_retcode));
r->resp = readString(fromChild);
}
*resp = response;
return PAM_SUCCESS;
}
static void
_authenticate(const char *userName)
{
// printf("authenticate %s\n",userName);
pam_handle_t *pamh = NULL;
char *newUser;
int ret;
int authRet;
struct pam_conv conv;
conv.conv = pam_conversation;
conv.appdata_ptr = NULL;
ret = pam_start("control-center", userName, &conv, &pamh);
if(ret != PAM_SUCCESS)
{
printf("failed to start PAM: = %s\n", pam_strerror(NULL, ret));
}
authRet = pam_authenticate(pamh, 0);
ret = pam_get_item(pamh, PAM_USER, (const void **)&newUser);
if(ret != PAM_SUCCESS)
{
pam_end(pamh, 0);
printf("failed to get username\n");
}
free(newUser);
newUser = NULL;
// fprintf(stderr, "authentication result: %d\n", authRet);
// 发送认证结果
int authComplete = 1;
writeData(toParent, (const void*)&authComplete, sizeof(authComplete));
writeData(toParent, (const void *)&authRet, sizeof(authRet));
/* ---认证完成\n*/
_exit(EXIT_SUCCESS);
}
int main(int argc, char **argv)
{
if (argc != 4)
{
return EXIT_FAILURE;
}
toParent = atoi (argv[1]);
fromChild = atoi (argv[2]);
if (toParent == 0 || fromChild == 0)
{
printf ("Invalid file descriptors %s %s\n", argv[2], argv[3]);
return EXIT_FAILURE;
}
//mlockall (MCL_CURRENT | MCL_FUTURE);
fcntl (toParent, F_SETFD, FD_CLOEXEC);
fcntl (fromChild, F_SETFD, FD_CLOEXEC);
_authenticate(argv[3]);
}
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