651 lines
20 KiB
C
651 lines
20 KiB
C
/*
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* Copyright (C) 2018 Tianjin KYLIN Information Technology Co., Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*
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**/
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#define PAM_SM_AUTH
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#include "generic.h"
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#include <stdio.h>
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#include <unistd.h>
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#include <pwd.h>
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#include <syslog.h>
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#include <security/pam_modules.h>
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#include <security/_pam_macros.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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#include <fcntl.h>
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#include <security/pam_ext.h>
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#include <signal.h>
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#include <errno.h>
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#define USER_CONFIG_FILE "/home/%s/.biometric_auth/ukui_biometric.conf"
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/* Declare log function */
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extern int pam_enable_debug;
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extern char *pam_log_prefix;
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extern int pam_logger(char *format, ...);
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static int ukui_biometric_lock = 0;
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int enable_biometric_authentication(pam_handle_t *pamh);
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int enable_qrcode_authentication(pam_handle_t *pamh);
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int enable_biometric_auth_double();
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/* GUI child process alive status */
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static int child_alive = 1;
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/* Signal handler */
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static void signal_handler(int signo)
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{
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if (signo == SIGUSR1)
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child_alive = 0; /* GUI child process has terminated */
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pam_logger("signal_handler is triggered\n");
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}
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int enable_biometric_authentication_app()
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{
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char conf_file[] = GET_STR(CONFIG_FILE);
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FILE *file;
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char line[1024];
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int i;
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int is_enable = 0;
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if((file = fopen(conf_file, "r")) == NULL){
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pam_logger("open configure file failed: %s\n", strerror(errno));
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return 1;
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}
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while(fgets(line, sizeof(line), file)) {
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i = sscanf(line, "EnableAuthApp=%d\n", &is_enable);
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if(i > 0) {
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pam_logger("EnableAuthApp=%d\n", is_enable);
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break;
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}
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}
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fclose(file);
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return is_enable;
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}
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/*
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* Check if the service should use biometric authentication
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*/
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int service_filter(char *service)
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{
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//int is_enable = enable_biometric_authentication_app();
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//syslog(LOG_INFO,"is_enable = %d service = %s\n",is_enable,service);
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if (strcmp(service, "lightdm") == 0) {
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int ret = system("/bin/chmod -f a+wr /tmp/bio.log");
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(void)ret; /* Suppress gcc ignoring return value warning */
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//if(is_enable & 1 == 0)
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// return 0;
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return 1;
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}
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if (strcmp(service, "ukui-screensaver-qt") == 0){
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//if((is_enable & (1<<1)) == 0)
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// return 0;
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return 1;
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}
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if (strcmp(service, "polkit-1") == 0){
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//if((is_enable & (1<<2)) == 0)
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// return 0;
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return 1;
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}
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if (strcmp(service, "sudo") == 0){
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//if((is_enable & (1<<3)) == 0)
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// return 0;
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return 1;
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}
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if (strcmp(service, "su") == 0){
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//if((is_enable & (1<<4)) == 0)
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// return 0;
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return 1;
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}
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if (strcmp(service, "login") == 0){
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//if((is_enable & (1<<5)) == 0)
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// return 0;
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return 1;
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}
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#ifdef ENABLE_BIOTEST
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if (strcmp(service, "biotest") == 0)
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return 1;
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#endif
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return 0;
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}
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/*
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* Invoke the PAM conversation function
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*/
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int call_conversation(pam_handle_t *pamh, int msg_style, char *msg, char *resp)
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{
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/* PAM data structures used by conversation */
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const struct pam_message *message[1] = {0};
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struct pam_message *message_tmp = 0;
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struct pam_response *response = 0;
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const struct pam_conv *conv_struct = 0;
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int status = -1;
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status = pam_get_item(pamh, PAM_CONV, (const void **)&conv_struct);
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if (status != PAM_SUCCESS)
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return PAM_SYSTEM_ERR;
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message_tmp = (struct pam_message *)malloc(sizeof(struct pam_message));
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message_tmp->msg_style = msg_style;
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message_tmp->msg = msg;
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message[0] = message_tmp;
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pam_logger("Call conv callback function\n");
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status = conv_struct->conv(1, message, &response, conv_struct->appdata_ptr);
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pam_logger("Finish conv callback function\n");
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if (resp && response->resp)
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strcpy(resp, response->resp);
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/* Use typecast to suppress gcc warnings */
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free((void *)message[0]);
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if (response->resp)
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free(response->resp);
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free(response);
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return status;
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}
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/* GUI child process */
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void child(char *service, char *username, char *xdisp)
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{
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char *gui = "/usr/bin/bioauth";
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pam_logger("Child process will be replaced.\n");
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int fd = open("/dev/null", O_WRONLY);
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dup2(fd, 2);
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execl(gui, "bioauth",
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"--service", service,
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"--user", username,
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// "--display", xdisp,
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pam_enable_debug ? "--debug" : "",
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(char *)0);
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/*
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* execl almost always succeed as long as the GUI executable file exists.
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* Though invoking GUI under console will exit with error, the GUI child
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* process won't reach here. Therefore, the following code won't be
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* executed in general.
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*/
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pam_logger("Fatal error: execl(gui) failed in child process. "
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"This is an extremely rare condition. Please ensure that the "
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"biometric-authentication executable file exists.\n");
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pam_logger("Use password as a fallback\n");
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pam_logger("Child _exit with BIO_IGNORE\n");
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/* Child process exits */
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_exit(BIO_IGNORE);
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}
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void handler()
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{
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return;
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}
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/* PAM parent process */
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int parent(int pid, pam_handle_t *pamh, int need_call_conv)
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{
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pam_logger("Parent process continue running.\n");
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int child_status = -1;
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/*
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* 1. If calling conversation function is not needed, wait the child
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* until it exits.
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* 2. Otherwise, send a text info to application at first and then
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* call the conversation function to request the password. The returned
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* password is unused.
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* Note: During requesting the password, screensaver won't display the
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* prompting message, while greeter will display it into the password
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* entry. If there is a "\n" at the end of the message, it will be
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* displayed on the Label above the password entry.
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*/
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if (need_call_conv) {
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char *lang = getenv("LANG");
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char *msg1, *msg2;
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if (lang && !strncmp(lang, "zh_CN", 5))
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msg1 = "请进行生物识别或点击“切换到密码登录”\n";
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else
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msg1 = "Use biometric authentication or click "
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"\"Switch to password\"\n";
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#ifdef EMPTY_PAM_PWD_PROMPT
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msg2 = "";
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#else
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msg2 = "pam_biometric.so needs a fake ENTER:";
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#endif
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if (signal(SIGUSR1, signal_handler) == SIG_ERR)
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pam_logger("Fatal Error. Can't catch SIGUSR1\n");
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reinvoke:
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call_conversation(pamh, PAM_TEXT_INFO, msg1, NULL);
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call_conversation(pamh, PAM_PROMPT_ECHO_OFF, msg2, NULL);
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/* GUI child process is still alive. This enter is typed by user. */
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if (child_alive == 1)
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goto reinvoke;
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signal(SIGUSR1, SIG_DFL);
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waitpid(pid, &child_status, 0);
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} else {
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pam_logger("Waiting for the GUI child process to exit...\n");
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//由于sudo命令在进入pam认证时，会阻塞来自终端的SIGINT以及SIGQUIT信号，导致使用
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//pam认证时，按下Ctrl+C无反应，认证完成后，sudo会退出，这里为了简单，取消了阻塞
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//信号，捕获信号但不做处理，在认证完成后，恢复原本阻塞状态
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sigset_t mask;
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sigprocmask(SIG_BLOCK,NULL,&mask);
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sigprocmask(SIG_UNBLOCK,&mask,NULL);
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signal(SIGINT,handler);
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waitpid(pid, &child_status, 0);
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pam_logger("GUI child process has exited.\n");
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sigprocmask(SIG_SETMASK,&mask,NULL);
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}
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/*
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* Determine the return value of PAM according to the return value of
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* child process.
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*/
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int bio_result = BIO_ERROR; /* biometric result code */
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if (WIFEXITED(child_status))
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bio_result = WEXITSTATUS(child_status);
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else /* This may be because the GUI child process is invoked under console. */
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pam_logger("The GUI-Child process terminate abnormally.\n");
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if (bio_result == BIO_SUCCESS) {
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if(!enable_biometric_authentication(pamh) && !enable_qrcode_authentication(pamh)) {
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pam_logger("disable biometric authentication.\n");
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return PAM_SYSTEM_ERR;
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}
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pam_logger("pam_biometric.so return PAM_SUCCESS\n");
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return PAM_SUCCESS;
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} else if (bio_result == BIO_IGNORE) {
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/* Override msg1 to empty the label. We are ready to enter the password module. */
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call_conversation(pamh, PAM_TEXT_INFO, "", NULL);
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ukui_biometric_lock = 1;
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pam_logger("pam_biometric.so return PAM_IGNORE\n");
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return PAM_IGNORE;
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} else {
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pam_logger("pam_biometric.so return PAM_SYSTEM_ERR\n");
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ukui_biometric_lock = 1;
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return PAM_SYSTEM_ERR;
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}
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}
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/* Set environment variables related to displaying */
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void check_and_set_env(pam_handle_t *pamh, char **xdisp, char **xauth)
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{
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*xdisp=getenv("DISPLAY");
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*xauth=getenv("XAUTHORITY");
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if (*xdisp == 0){
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pam_get_item(pamh, PAM_XDISPLAY, (const void **)xdisp);
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if (*xdisp)
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setenv("DISPLAY",*xdisp,-1);
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}
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if (*xauth == 0)
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setenv("XAUTHORITY", "/var/run/lightdm/root/:0", -1);
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*xdisp=getenv("DISPLAY");
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*xauth=getenv("XAUTHORITY");
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if (*xdisp == 0)
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pam_logger("Warning: DISPLAY env is still empty, "
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"this is not an error if you are using terminal\n");
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if (*xauth == 0)
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pam_logger("Warning: XAUTHORITY env is still empty, "
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"this is not an error if you are using terminal\n");
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}
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/* Biometric processing function for generic purpose */
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int biometric_auth_independent(pam_handle_t *pamh , char *service, int need_call_conv)
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{
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/* Get the username */
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char *username = 0;
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pam_get_item(pamh, PAM_USER, (const void **)&username);
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/* Check and set environment variables */
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char *xdisp, *xauth;
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check_and_set_env(pamh, &xdisp, &xauth);
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/* Detach child process */
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unsigned int pid;
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pid = fork();
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if (pid == 0 ) {
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child(service, username, xdisp);
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pam_logger("Should never reach here.\n");
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return PAM_SYSTEM_ERR;
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} else if (pid > 0) {
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return parent(pid, pamh, need_call_conv);
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} else {
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pam_logger("Fork Error!\n");
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return PAM_SYSTEM_ERR;
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}
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}
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/* Biometric processing function fot polkit-1 */
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int biometric_auth_polkit()
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{
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pam_logger("Current service is polkit-1\n");
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const char *fifo_name = "/tmp/bio.fifo";
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if(access(fifo_name, F_OK) == -1) {
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int res = mkfifo(fifo_name, 0777);
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if(res != 0) {
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pam_logger("Can't create FIFO file\n");
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return PAM_SYSTEM_ERR;
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}
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}
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int fifo_rd = open(fifo_name, O_RDONLY);
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if (fifo_rd == -1)
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return PAM_SYSTEM_ERR;
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pam_logger("Before reading FIFO\n");
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char buffer[8] = {0};
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if(read(fifo_rd, buffer, 8) == -1)
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return PAM_SYSTEM_ERR;
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pam_logger("After reading FIFO\n");
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int result_code;
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sscanf(buffer, "%d", &result_code);
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remove(fifo_name);
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if (result_code == BIO_SUCCESS) {
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pam_logger("pam_biometric.so return PAM_SUCCESS\n");
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return PAM_SUCCESS;
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} else if (result_code == BIO_IGNORE) {
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pam_logger("pam_biometric.so return PAM_IGNORE\n");
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return PAM_IGNORE;
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} else {
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pam_logger("pam_biometric.so return PAM_SYSTEM_ERR\n");
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return PAM_SYSTEM_ERR;
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}
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}
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int biometric_auth_embeded(pam_handle_t *pamh)
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{
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/*
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* By convention, PAM module sends a string "BIOMETRIC_PAM" to
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* lightdm and this message will be forwarded to greeter. After
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* the authentication is completed, greeter will send a string
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* "BIOMETRIC_IGNORE"/"BIOMETRIC_SUCCESS" to lightdm and then it
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* will be forwarded to PAM module. We can get the authentication
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* status by comparing strings.
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*/
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char resp[96] = {0};
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if(enable_biometric_auth_double())
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call_conversation(pamh, PAM_PROMPT_ECHO_OFF, BIOMETRIC_PAM_DOUBLE, resp);
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else
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call_conversation(pamh, PAM_PROMPT_ECHO_OFF, BIOMETRIC_PAM, resp);
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if (strcmp(resp, BIOMETRIC_IGNORE) == 0)
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return PAM_IGNORE;
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else if (strcmp(resp, BIOMETRIC_SUCCESS) == 0){
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if(!enable_biometric_authentication(pamh) && !enable_qrcode_authentication(pamh)) {
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pam_logger("disable biometric authentication.\n");
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return PAM_SYSTEM_ERR;
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}
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return PAM_SUCCESS;
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}
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else if (strcmp(resp, BIOMETRIC_FAILED) == 0)
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return PAM_AUTH_ERR;
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else
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return PAM_SYSTEM_ERR;
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}
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void get_greeter_session(char buf[], int len)
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{
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FILE *stream;
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char cmd[] = "ps -aux | grep greeter-session | grep -v grep | awk '{print $13}' | awk -F '/' '{print $4}'";
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memset(buf, 0, len);
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stream = popen(cmd, "r");
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if(fgets(buf, len, stream) == NULL)
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pam_logger("get greeter session error: %d\n", errno);
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buf[strlen(buf)-1] = '\0';
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if(strlen(buf) == 0) {
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char cmd1[] = "ps aux | grep ukui-greeter | grep -v grep | wc -l";
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pclose(stream);
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stream = popen(cmd1, "r");
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if(fgets(buf, len, stream) == NULL)
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pam_logger("get greeter session error: %d\n", errno);
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int i = atoi(buf);
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if(i > 0)
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strcpy(buf, "ukui-greeter");
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}
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pclose(stream);
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}
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int enable_by_polkit()
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{
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FILE *file;
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char buf[1024];
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if( (file = fopen(BIO_COM_FILE, "r")) == NULL) {
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pam_logger("open communication file failed: %s\n", strerror(errno));
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return 0;
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}
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memset(buf, 0, sizeof(buf));
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fgets(buf, sizeof(buf), file);
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fclose(file);
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if(remove(BIO_COM_FILE) < 0)
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pam_logger("remove communication file failed: %s\n", strerror(errno));
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pam_logger("%s\n", buf);
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if(strcmp(buf, "polkit-ukui-authentication-agent-1") == 0)
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return 1;
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return 0;
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}
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int enable_biometric_authentication(pam_handle_t *pamh)
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{
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char *username = NULL;
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int is_found = 0;
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int is_auth_enable = 0;
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pam_get_item(pamh, PAM_USER, (const void **)&username);
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if (username) {
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char conf_file_user[256];
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snprintf(conf_file_user, 255, USER_CONFIG_FILE, username);
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FILE *file = NULL;
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char line[1024], is_enable[16];
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int i;
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if((file = fopen(conf_file_user, "r")) == NULL){
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pam_logger("open configure file failed: %s\n", strerror(errno));
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} else {
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while(fgets(line, sizeof(line), file)) {
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i = sscanf(line, "EnableAuth=%15s\n", is_enable);
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if(i > 0) {
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pam_logger("EnableAuth=%s\n", is_enable);
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is_found = 1;
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break;
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}
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}
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fclose(file);
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if(!strcmp(is_enable, "true"))
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is_auth_enable = 1;
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}
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}
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if (is_found != 0) {
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return is_auth_enable;
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}
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char conf_file[] = GET_STR(CONFIG_FILE);
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FILE *file;
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char line[1024], is_enable[16];
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int i;
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if((file = fopen(conf_file, "r")) == NULL){
|
||
pam_logger("open configure file failed: %s\n", strerror(errno));
|
||
return 0;
|
||
}
|
||
while(fgets(line, sizeof(line), file)) {
|
||
i = sscanf(line, "EnableAuth=%15s\n", is_enable);
|
||
if(i > 0) {
|
||
pam_logger("EnableAuth=%s\n", is_enable);
|
||
break;
|
||
}
|
||
}
|
||
|
||
fclose(file);
|
||
if(!strcmp(is_enable, "true"))
|
||
return 1;
|
||
return 0;
|
||
}
|
||
|
||
int enable_qrcode_authentication(pam_handle_t *pamh)
|
||
{
|
||
char *username = NULL;
|
||
int is_found = 0;
|
||
int is_auth_enable = 0;
|
||
pam_get_item(pamh, PAM_USER, (const void **)&username);
|
||
if (username) {
|
||
char conf_file_user[256];
|
||
snprintf(conf_file_user, 255, USER_CONFIG_FILE, username);
|
||
FILE *file = NULL;
|
||
char line[1024], is_enable[16];
|
||
int i;
|
||
if((file = fopen(conf_file_user, "r")) == NULL){
|
||
pam_logger("open configure file failed: %s\n", strerror(errno));
|
||
} else {
|
||
while(fgets(line, sizeof(line), file)) {
|
||
i = sscanf(line, "EnableQRCode=%15s\n", is_enable);
|
||
if(i > 0) {
|
||
pam_logger("EnableQRCode=%s\n", is_enable);
|
||
is_found = 1;
|
||
break;
|
||
}
|
||
}
|
||
fclose(file);
|
||
if(!strcmp(is_enable, "true"))
|
||
is_auth_enable = 1;
|
||
}
|
||
}
|
||
if (is_found != 0) {
|
||
return is_auth_enable;
|
||
}
|
||
|
||
char conf_file[] = GET_STR(CONFIG_FILE);
|
||
FILE *file;
|
||
char line[1024], is_enable[16];
|
||
int i;
|
||
|
||
if((file = fopen(conf_file, "r")) == NULL){
|
||
pam_logger("open configure file failed: %s\n", strerror(errno));
|
||
return 0;
|
||
}
|
||
while(fgets(line, sizeof(line), file)) {
|
||
i = sscanf(line, "EnableQRCode=%15s\n", is_enable);
|
||
if(i > 0) {
|
||
pam_logger("EnableQRCode=%s\n", is_enable);
|
||
break;
|
||
}
|
||
}
|
||
|
||
fclose(file);
|
||
if(!strcmp(is_enable, "true"))
|
||
return 1;
|
||
return 0;
|
||
}
|
||
|
||
int enable_biometric_auth_double()
|
||
{
|
||
char conf_file[] = GET_STR(CONFIG_FILE);
|
||
FILE *file;
|
||
char line[1024], is_enable[16];
|
||
int i;
|
||
|
||
|
||
if((file = fopen(conf_file, "r")) == NULL){
|
||
pam_logger("open configure file failed: %s\n", strerror(errno));
|
||
return 0;
|
||
}
|
||
while(fgets(line, sizeof(line), file)) {
|
||
i = sscanf(line, "DoubleAuth=%s\n", is_enable);
|
||
if(i > 0) {
|
||
pam_logger("DoubleAuth=%s\n", is_enable);
|
||
break;
|
||
}
|
||
}
|
||
|
||
fclose(file);
|
||
if(!strcmp(is_enable, "true"))
|
||
return 1;
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
* SPI interface
|
||
*/
|
||
int pam_sm_authenticate(pam_handle_t *pamh, int flags, int argc,
|
||
const char **argv)
|
||
{
|
||
for(int i = 0; i < argc; i++) {
|
||
if(strcmp(argv[i], "debug") == 0) {
|
||
pam_enable_debug = 1;
|
||
pam_log_prefix = "PAM_BIO";
|
||
}
|
||
}
|
||
|
||
pam_logger("Invoke libpam_biometric.so module\n");
|
||
|
||
char *service = 0;
|
||
|
||
if((!enable_biometric_authentication(pamh) && !enable_qrcode_authentication(pamh)) || ukui_biometric_lock) {
|
||
pam_logger("disable biometric authentication.\n");
|
||
return PAM_IGNORE;
|
||
}
|
||
pam_logger("enable biometric authentication.\n");
|
||
|
||
pam_get_item(pamh, PAM_SERVICE, (const void **)&service);
|
||
|
||
/* Service filter */
|
||
if (!service_filter(service)){
|
||
pam_logger("Service <%s> should not use biometric-authentication\n", service);
|
||
return PAM_IGNORE;
|
||
}
|
||
|
||
/* Different services use different processing function */
|
||
if (strcmp(service, "lightdm") == 0) {
|
||
char buf[128];
|
||
get_greeter_session(buf, sizeof(buf));
|
||
pam_logger("current greeter: %s\n", buf);
|
||
|
||
if(strcmp(buf, "ukui-greeter") == 0 || strcmp(buf, "ukui-greeter-wayland") == 0)
|
||
return biometric_auth_embeded(pamh);
|
||
// else
|
||
// return biometric_auth_independent(pamh, "lightdm", 1);
|
||
}
|
||
else if (strcmp(service, "ukui-screensaver-qt")==0)
|
||
return biometric_auth_embeded(pamh);
|
||
else if (strcmp(service, "polkit-1") == 0){
|
||
if(enable_by_polkit())
|
||
return biometric_auth_embeded(pamh);
|
||
else
|
||
pam_logger("[PAM_BIOMETRIC]: It's not polkit-ukui-authentication-agent-1.\n");
|
||
}
|
||
else if (strcmp(service, "sudo") == 0)
|
||
return biometric_auth_independent(pamh, "sudo", 0);
|
||
else if (strcmp(service, "login") == 0)
|
||
return biometric_auth_independent(pamh, "login", 0);
|
||
else if (strcmp(service, "su") == 0)
|
||
return biometric_auth_independent(pamh, "su", 0);
|
||
// else if (strcmp(service, "mate-screensaver") == 0)
|
||
// return biometric_auth_independent(pamh, "mate-screensaver", 1);
|
||
#ifdef ENABLE_BIOTEST
|
||
else if (strcmp(service, "biotest") == 0)
|
||
return biometric_auth_independent(pamh, "biotest", 1);
|
||
#endif
|
||
else
|
||
pam_logger("Service <%s> slip through the service filter\n", service);
|
||
return PAM_IGNORE;
|
||
}
|
||
|
||
int
|
||
pam_sm_setcred (pam_handle_t *pamh, int flags ,
|
||
int argc , const char **argv )
|
||
{
|
||
return PAM_SUCCESS;
|
||
}
|
||
|