282 lines
8.5 KiB
C
282 lines
8.5 KiB
C
#define _GNU_SOURCE
|
|
#include <dlfcn.h>
|
|
#include <fcntl.h>
|
|
#include <json-c/json.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <sys/stat.h>
|
|
#include <time.h>
|
|
#include <unistd.h>
|
|
|
|
#define CONFIG_FILE "./config/execve_rules.json"
|
|
#define LOG_FILE "./logs/execve.log"
|
|
#define LOG_OUT_FILE "./logs/execve_out.log"
|
|
|
|
#define COMMAND_NOT_FOUND "/usr/lib/command-not-found"
|
|
|
|
#define ANSI_COLOR_RED "\033[31m"
|
|
#define ANSI_COLOR_YELLOW "\033[33m"
|
|
#define ANSI_COLOR_RESET "\033[0m"
|
|
|
|
typedef struct {
|
|
char cmd[256];
|
|
char type[32];
|
|
char msg[1024];
|
|
char args[10][256]; // 支持最多 10 个参数
|
|
int arg_count;
|
|
} Rule;
|
|
|
|
// 加载配置规则
|
|
Rule *load_rules(int *rule_count) {
|
|
json_object *root = json_object_from_file(CONFIG_FILE);
|
|
if (!root) {
|
|
fprintf(stderr, "Failed to parse JSON from %s\n", CONFIG_FILE);
|
|
*rule_count = 0;
|
|
return NULL;
|
|
}
|
|
|
|
*rule_count = json_object_array_length(root);
|
|
Rule *rules = malloc(sizeof(Rule) * (*rule_count));
|
|
if (!rules) {
|
|
json_object_put(root);
|
|
*rule_count = 0;
|
|
return NULL;
|
|
}
|
|
|
|
for (int i = 0; i < *rule_count; i++) {
|
|
json_object *rule = json_object_array_get_idx(root, i);
|
|
json_object *cmd, *type, *msg, *args;
|
|
|
|
json_object_object_get_ex(rule, "cmd", &cmd);
|
|
json_object_object_get_ex(rule, "type", &type);
|
|
json_object_object_get_ex(rule, "msg", &msg);
|
|
|
|
strncpy(rules[i].cmd, json_object_get_string(cmd), 255);
|
|
strncpy(rules[i].type, json_object_get_string(type), 31);
|
|
strncpy(rules[i].msg, json_object_get_string(msg), 1023);
|
|
|
|
// 解析 args 参数
|
|
rules[i].arg_count = 0;
|
|
if (json_object_object_get_ex(rule, "args", &args) &&
|
|
json_object_get_type(args) == json_type_array) {
|
|
int args_len = json_object_array_length(args);
|
|
rules[i].arg_count =
|
|
args_len < 10 ? args_len : 10; // 限制最多 10 个参数
|
|
|
|
for (int j = 0; j < rules[i].arg_count; j++) {
|
|
json_object *arg_item = json_object_array_get_idx(args, j);
|
|
strncpy(rules[i].args[j], json_object_get_string(arg_item),
|
|
255);
|
|
}
|
|
}
|
|
}
|
|
|
|
json_object_put(root);
|
|
return rules;
|
|
}
|
|
|
|
// 检查 args 是否匹配
|
|
int args_match(char *const argv[], Rule *rule) {
|
|
if (rule->arg_count == 0) {
|
|
return 1; // 没有 args 约束，则直接匹配
|
|
}
|
|
|
|
for (int i = 0; i < rule->arg_count; i++) {
|
|
int found = 0;
|
|
for (int j = 1; argv[j] != NULL; j++) { // 跳过 argv[0] (命令本身)
|
|
if (strcmp(argv[j], rule->args[i]) == 0) {
|
|
found = 1;
|
|
break;
|
|
}
|
|
}
|
|
if (!found) return 0; // 只要有一个参数没有匹配，则不符合规则
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
// 写入日志
|
|
void write_log(const char *filename, char *const argv[]) {
|
|
time_t now;
|
|
time(&now);
|
|
|
|
FILE *log = fopen(LOG_FILE, "a");
|
|
if (!log) return;
|
|
|
|
fprintf(log, "[%s] Command: %s\n", ctime(&now), filename);
|
|
|
|
for (int i = 0; argv[i]; i++) {
|
|
fprintf(log, "arg[%d]: %s\n", i, argv[i]);
|
|
}
|
|
|
|
fclose(log);
|
|
}
|
|
|
|
// 复制标准输出和错误输出到日志文件
|
|
void duplicate_output_to_log() {
|
|
int log_fd = open(LOG_OUT_FILE, O_WRONLY | O_CREAT | O_APPEND, 0644);
|
|
if (log_fd < 0) return;
|
|
|
|
int stdout_copy = dup(STDOUT_FILENO);
|
|
int stderr_copy = dup(STDERR_FILENO);
|
|
|
|
dup2(log_fd, STDOUT_FILENO);
|
|
dup2(log_fd, STDERR_FILENO);
|
|
close(log_fd);
|
|
|
|
// 让 stdout 和 stderr 同时输出到日志文件和控制台
|
|
FILE *log_file = fdopen(log_fd, "a");
|
|
if (log_file) {
|
|
setvbuf(stdout, NULL, _IOLBF, 0);
|
|
setvbuf(stderr, NULL, _IOLBF, 0);
|
|
stdout = log_file;
|
|
stderr = log_file;
|
|
}
|
|
|
|
dup2(stdout_copy, STDOUT_FILENO);
|
|
dup2(stderr_copy, STDERR_FILENO);
|
|
close(stdout_copy);
|
|
close(stderr_copy);
|
|
}
|
|
|
|
|
|
typedef int (*orig_execve_type)(const char *filename, char *const argv[],
|
|
char *const envp[]);
|
|
|
|
static Rule *rules = NULL;
|
|
static int rule_count = 0;
|
|
static time_t last_modified_time = 0;
|
|
|
|
// 判断父进程是否为终端 shell (bash, zsh, fish 等)
|
|
int is_terminal_shell() {
|
|
pid_t ppid = getppid();
|
|
char path[64], proc_name[256];
|
|
FILE *file;
|
|
|
|
snprintf(path, sizeof(path), "/proc/%d/comm", ppid);
|
|
file = fopen(path, "r");
|
|
if (!file) return 0;
|
|
|
|
if (fgets(proc_name, sizeof(proc_name), file)) {
|
|
proc_name[strcspn(proc_name, "\n")] = 0; // 去除换行符
|
|
if (strcmp(proc_name, "bash") == 0 || strcmp(proc_name, "zsh") == 0 ||
|
|
strcmp(proc_name, "fish") == 0 || strcmp(proc_name, "sh") == 0) {
|
|
fclose(file);
|
|
return 1;
|
|
}
|
|
}
|
|
fclose(file);
|
|
return 0;
|
|
}
|
|
|
|
// 检查配置文件是否已修改
|
|
int config_file_modified() {
|
|
struct stat file_stat;
|
|
if (stat(CONFIG_FILE, &file_stat) != 0) {
|
|
return 0;
|
|
}
|
|
return file_stat.st_mtime != last_modified_time;
|
|
}
|
|
|
|
// 加载或重新加载规则
|
|
void load_rules_if_needed() {
|
|
if (!rules || config_file_modified()) {
|
|
json_object *root = json_object_from_file(CONFIG_FILE);
|
|
if (!root) {
|
|
fprintf(stderr, "Failed to parse JSON from %s\n", CONFIG_FILE);
|
|
return;
|
|
}
|
|
|
|
if (rules) {
|
|
free(rules);
|
|
}
|
|
|
|
rule_count = json_object_array_length(root);
|
|
rules = malloc(sizeof(Rule) * rule_count);
|
|
if (!rules) {
|
|
json_object_put(root);
|
|
rule_count = 0;
|
|
return;
|
|
}
|
|
|
|
for (int i = 0; i < rule_count; i++) {
|
|
json_object *rule = json_object_array_get_idx(root, i);
|
|
json_object *cmd, *type, *msg, *args;
|
|
|
|
json_object_object_get_ex(rule, "cmd", &cmd);
|
|
json_object_object_get_ex(rule, "type", &type);
|
|
json_object_object_get_ex(rule, "msg", &msg);
|
|
|
|
strncpy(rules[i].cmd, json_object_get_string(cmd), 255);
|
|
strncpy(rules[i].type, json_object_get_string(type), 31);
|
|
strncpy(rules[i].msg, json_object_get_string(msg), 1023);
|
|
|
|
// 解析 args 参数
|
|
rules[i].arg_count = 0;
|
|
if (json_object_object_get_ex(rule, "args", &args) &&
|
|
json_object_get_type(args) == json_type_array) {
|
|
int args_len = json_object_array_length(args);
|
|
rules[i].arg_count = args_len < 10 ? args_len : 10;
|
|
|
|
for (int j = 0; j < rules[i].arg_count; j++) {
|
|
json_object *arg_item = json_object_array_get_idx(args, j);
|
|
strncpy(rules[i].args[j], json_object_get_string(arg_item),
|
|
255);
|
|
}
|
|
}
|
|
}
|
|
|
|
json_object_put(root);
|
|
struct stat file_stat;
|
|
if (stat(CONFIG_FILE, &file_stat) == 0) {
|
|
last_modified_time = file_stat.st_mtime;
|
|
}
|
|
}
|
|
}
|
|
|
|
int execve(const char *filename, char *const argv[], char *const envp[]) {
|
|
// 仅在 shell 终端调用 execve 时拦截
|
|
if (!is_terminal_shell()) {
|
|
orig_execve_type orig_execve =
|
|
(orig_execve_type)dlsym(RTLD_NEXT, "execve");
|
|
return orig_execve(filename, argv, envp);
|
|
}
|
|
|
|
// 加载规则（仅在需要时）
|
|
load_rules_if_needed();
|
|
write_log(filename, argv);
|
|
|
|
const char *basename = argv[0];
|
|
if (strcmp(filename, COMMAND_NOT_FOUND) == 0 && argv[2]) {
|
|
basename = argv[2];
|
|
}
|
|
|
|
for (int i = 0; i < rule_count; i++) {
|
|
if (strcmp(basename, rules[i].cmd) == 0 &&
|
|
args_match(argv, &rules[i])) {
|
|
if (strcmp(rules[i].type, "warn") == 0) {
|
|
printf(ANSI_COLOR_YELLOW "[Warning] %s\n" ANSI_COLOR_RESET,
|
|
rules[i].msg);
|
|
printf("按下 'Y' 继续执行, 或按任意键取消: ");
|
|
char input = getchar();
|
|
if (input != 'Y' && input != 'y') {
|
|
printf("\nExecution cancelled.\n");
|
|
return -1;
|
|
}
|
|
printf("\nContinuing execution...\n");
|
|
} else if (strcmp(rules[i].type, "error") == 0) {
|
|
printf(ANSI_COLOR_RED "[Error] %s" ANSI_COLOR_RESET "\n",
|
|
rules[i].msg);
|
|
return -1;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
// 复制 stdout 和 stderr 到日志文件
|
|
duplicate_output_to_log();
|
|
|
|
orig_execve_type orig_execve = (orig_execve_type)dlsym(RTLD_NEXT, "execve");
|
|
return orig_execve(filename, argv, envp);
|
|
}
|