/mandos/trunk : revision 96

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#include <argp.h> /* struct argp_option, struct

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argp_state, struct argp,

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argp_parse(), ARGP_ERR_UNKNOWN,

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ARGP_KEY_END, ARGP_KEY_ARG,

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error_t */

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ARGP_KEY_END, ARGP_KEY_ARG, error_t */

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#include <signal.h> /* struct sigaction, sigemptyset(),

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sigaddset(), sigaction(),

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sigprocmask(), SIG_BLOCK, SIGCHLD,

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#include <errno.h> /* errno, EBADF */

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#define BUFFER_SIZE 256

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#define PDIR "/lib/mandos/plugins.d"

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#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"

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#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"

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const char *argp_program_version = "plugin-runner 1.0";

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const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";

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struct plugin;

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struct process;

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typedef struct process{

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pid_t pid;

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int fd;

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char *buffer;

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size_t buffer_size;

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size_t buffer_length;

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bool eof;

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bool completed;

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int status;

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struct process *next;

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} process;

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typedef struct plugin{

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char *name; /* can be NULL or any plugin name */

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char **environ;

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int envc;

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bool disabled;

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/* Variables used for running processes*/

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pid_t pid;

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int fd;

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char *buffer;

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size_t buffer_size;

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size_t buffer_length;

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bool eof;

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volatile bool completed;

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volatile int status;

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struct plugin *next;

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} plugin;

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static plugin *plugin_list = NULL;

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/* Gets an existing plugin based on name,

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or if none is found, creates a new one */

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static plugin *getplugin(char *name){

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/* Check for exiting plugin with that name */

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for (plugin *p = plugin_list; p != NULL; p = p->next){

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static plugin *getplugin(char *name, plugin **plugin_list){

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for (plugin *p = *plugin_list; p != NULL; p = p->next){

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if ((p->name == name)

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or (p->name and name and (strcmp(p->name, name) == 0))){

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return p;

111

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if (new_plugin == NULL){

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return NULL;

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107

}

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char *copy_name = NULL;

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if(name != NULL){

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copy_name = strdup(name);

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if(copy_name == NULL){

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return NULL;

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}

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char *copy_name = strdup(name);

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if(copy_name == NULL){

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return NULL;

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111

}

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*new_plugin = (plugin) { .name = copy_name,

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.argc = 1,

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.envc = 0,

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.disabled = false,

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.next = plugin_list };

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.next = *plugin_list };

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new_plugin->argv = malloc(sizeof(char *) * 2);

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if (new_plugin->argv == NULL){

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free(copy_name);

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free(new_plugin);

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return NULL;

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123

}

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new_plugin->argv[0] = copy_name;

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new_plugin->argv[1] = NULL;

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126

136

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new_plugin->environ = malloc(sizeof(char *));

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if(new_plugin->environ == NULL){

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free(copy_name);

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129

free(new_plugin->argv);

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free(new_plugin);

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return NULL;

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}

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new_plugin->environ[0] = NULL;

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/* Append the new plugin to the list */

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plugin_list = new_plugin;

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*plugin_list = new_plugin;

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136

return new_plugin;

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}

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168

}

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/* Add to a plugin's environment */

182

static bool add_environment(plugin *p, const char *def, bool replace){

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static bool add_environment(plugin *p, const char *def){

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if(p == NULL){

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return false;

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}

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/* namelen = length of name of environment variable */

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size_t namelen = (size_t)(strchrnul(def, '=') - def);

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/* Search for this environment variable */

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for(char **e = p->environ; *e != NULL; e++){

190

if(strncmp(*e, def, namelen + 1) == 0){

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/* It already exists */

192

if(replace){

193

char *new = realloc(*e, strlen(def) + 1);

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if(new == NULL){

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return false;

196

}

197

*e = new;

198

strcpy(*e, def);

199

}

200

return true;

201

}

202

}

203

175

return add_to_char_array(def, &(p->environ), &(p->envc));

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176

}

205

177

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179

/*

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* Based on the example in the GNU LibC manual chapter 13.13 "File

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* Descriptor Flags".

219

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return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);

220

193

}

221

194

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process *process_list = NULL;

222

196

223

/* Mark processes as completed when they exit, and save their exit

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/* Mark a process as completed when it exits, and save its exit

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status. */

225

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void handle_sigchld(__attribute__((unused)) int sig){

226

while(true){

227

plugin *proc = plugin_list;

228

int status;

229

pid_t pid = waitpid(-1, &status, WNOHANG);

230

if(pid == 0){

231

/* Only still running child processes */

232

break;

233

}

234

if(pid == -1){

235

if (errno != ECHILD){

236

perror("waitpid");

237

}

238

/* No child processes */

239

break;

240

}

241

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/* A child exited, find it in process_list */

243

while(proc != NULL and proc->pid != pid){

244

proc = proc->next;

245

}

246

if(proc == NULL){

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/* Process not found in process list */

248

continue;

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}

250

proc->status = status;

251

proc->completed = true;

252

}

200

process *proc = process_list;

201

int status;

202

pid_t pid = wait(&status);

203

if(pid == -1){

204

perror("wait");

205

return;

206

}

207

while(proc != NULL and proc->pid != pid){

208

proc = proc->next;

209

}

210

if(proc == NULL){

211

/* Process not found in process list */

212

return;

213

}

214

proc->status = status;

215

proc->completed = true;

253

216

}

254

217

255

/* Prints out a password to stdout */

256

218

bool print_out_password(const char *buffer, size_t length){

257

219

ssize_t ret;

258

220

if(length>0 and buffer[length-1] == '\n'){

268

230

return true;

269

231

}

270

232

271

/* Removes and free a plugin from the plugin list */

272

static void free_plugin(plugin *plugin_node){

273

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for(char **arg = plugin_node->argv; *arg != NULL; arg++){

275

free(*arg);

276

}

277

free(plugin_node->argv);

278

for(char **env = plugin_node->environ; *env != NULL; env++){

279

free(*env);

280

}

281

free(plugin_node->environ);

282

free(plugin_node->buffer);

283

284

/* Removes the plugin from the singly-linked list */

285

if(plugin_node == plugin_list){

286

/* First one - simple */

287

plugin_list = plugin_list->next;

288

} else {

289

/* Second one or later */

290

for(plugin *p = plugin_list; p != NULL; p = p->next){

291

if(p->next == plugin_node){

292

p->next = plugin_node->next;

293

break;

294

}

233

char **add_to_argv(char **argv, int *argc, char *arg){

234

if (argv == NULL){

235

*argc = 1;

236

argv = malloc(sizeof(char*) * 2);

237

if(argv == NULL){

238

return NULL;

295

239

}

296

}

297

298

free(plugin_node);

240

argv[0] = NULL; /* Will be set to argv[0] in main before parsing */

241

argv[1] = NULL;

242

}

243

*argc += 1;

244

argv = realloc(argv, sizeof(char *)

245

* ((unsigned int) *argc + 1));

246

if(argv == NULL){

247

return NULL;

248

}

249

argv[*argc-1] = arg;

250

argv[*argc] = NULL;

251

return argv;

299

252

}

300

253

301

static void free_plugin_list(void){

302

while(plugin_list != NULL){

303

free_plugin(plugin_list);

304

}

254

static void free_plugin_list(plugin *plugin_list){

255

for(plugin *next = plugin_list; plugin_list != NULL; plugin_list = next){

256

next = plugin_list->next;

257

free(plugin_list->name);

258

for(char **arg = plugin_list->argv; *arg != NULL; arg++){

259

free(*arg);

260

}

261

free(plugin_list->argv);

262

for(char **env = plugin_list->environ; *env != NULL; env++){

263

free(*env);

264

}

265

free(plugin_list->environ);

266

free(plugin_list);

267

}

305

268

}

306

269

307

270

int main(int argc, char *argv[]){

308

char *plugindir = NULL;

309

char *argfile = NULL;

271

const char *plugindir = "/lib/mandos/plugins.d";

272

const char *argfile = ARGFILE;

310

273

FILE *conffp;

311

274

size_t d_name_len;

312

275

DIR *dir = NULL;

335

298

ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);

336

299

if(ret == -1){

337

300

perror("sigaction");

338

exitstatus = EXIT_FAILURE;

301

exitstatus = EXIT_FAILURE;

339

302

goto fallback;

340

303

}

341

304

344

307

{ .name = "global-options", .key = 'g',

345

308

.arg = "OPTION[,OPTION[,...]]",

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309

.doc = "Options passed to all plugins" },

347

{ .name = "global-env", .key = 'G',

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{ .name = "global-envs", .key = 'e',

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.arg = "VAR=value",

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.doc = "Environment variable passed to all plugins" },

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{ .name = "options-for", .key = 'o',

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.arg = "PLUGIN:OPTION[,OPTION[,...]]",

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.doc = "Options passed only to specified plugin" },

353

{ .name = "env-for", .key = 'E',

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{ .name = "envs-for", .key = 'f',

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.arg = "PLUGIN:ENV=value",

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.doc = "Environment variable passed to specified plugin" },

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{ .name = "disable", .key = 'd',

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.arg = "PLUGIN",

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321

.doc = "Disable a specific plugin", .group = 1 },

359

{ .name = "enable", .key = 'e',

360

.arg = "PLUGIN",

361

.doc = "Enable a specific plugin", .group = 1 },

362

322

{ .name = "plugin-dir", .key = 128,

363

323

.arg = "DIRECTORY",

364

324

.doc = "Specify a different plugin directory", .group = 2 },

365

{ .name = "config-file", .key = 129,

366

.arg = "FILE",

367

.doc = "Specify a different configuration file", .group = 2 },

368

{ .name = "userid", .key = 130,

369

.arg = "ID", .flags = 0,

370

.doc = "User ID the plugins will run as", .group = 3 },

371

{ .name = "groupid", .key = 131,

372

.arg = "ID", .flags = 0,

373

.doc = "Group ID the plugins will run as", .group = 3 },

374

{ .name = "debug", .key = 132,

375

.doc = "Debug mode", .group = 4 },

325

{ .name = "userid", .key = 129,

326

.arg = "ID", .flags = 0,

327

.doc = "User ID the plugins will run as", .group = 2 },

328

{ .name = "groupid", .key = 130,

329

.arg = "ID", .flags = 0,

330

.doc = "Group ID the plugins will run as", .group = 2 },

331

{ .name = "debug", .key = 131,

332

.doc = "Debug mode", .group = 3 },

376

333

{ .name = NULL }

377

334

};

378

335

379

error_t parse_opt (int key, char *arg, __attribute__((unused))

380

struct argp_state *state) {

336

error_t parse_opt (int key, char *arg, struct argp_state *state) {

337

/* Get the INPUT argument from `argp_parse', which we know is a

338

pointer to our plugin list pointer. */

339

plugin **plugins = state->input;

381

340

switch (key) {

382

case 'g': /* --global-options */

341

case 'g':

383

342

if (arg != NULL){

384

343

char *p;

385

344

while((p = strsep(&arg, ",")) != NULL){

386

345

if(p[0] == '\0'){

387

346

continue;

388

347

}

389

if(not add_argument(getplugin(NULL), p)){

348

if(not add_argument(getplugin(NULL, plugins), p)){

390

349

perror("add_argument");

391

350

return ARGP_ERR_UNKNOWN;

392

351

}

393

352

}

394

353

}

395

354

break;

396

case 'G': /* --global-env */

355

case 'e':

397

356

if(arg == NULL){

398

357

break;

399

358

}

400

if(not add_environment(getplugin(NULL), arg, true)){

401

perror("add_environment");

359

{

360

char *envdef = strdup(arg);

361

if(envdef == NULL){

362

break;

363

}

364

if(not add_environment(getplugin(NULL, plugins), envdef)){

365

perror("add_environment");

366

}

402

367

}

403

368

break;

404

case 'o': /* --options-for */

369

case 'o':

405

370

if (arg != NULL){

406

371

char *p_name = strsep(&arg, ":");

407

if(p_name[0] == '\0' or arg == NULL){

372

if(p_name[0] == '\0'){

408

373

break;

409

374

}

410

375

char *opt = strsep(&arg, ":");

411

if(opt[0] == '\0' or opt == NULL){

376

if(opt[0] == '\0'){

412

377

break;

413

378

}

414

char *p;

415

while((p = strsep(&opt, ",")) != NULL){

416

if(p[0] == '\0'){

417

continue;

418

}

419

if(not add_argument(getplugin(p_name), p)){

420

perror("add_argument");

421

return ARGP_ERR_UNKNOWN;

379

if(opt != NULL){

380

char *p;

381

while((p = strsep(&opt, ",")) != NULL){

382

if(p[0] == '\0'){

383

continue;

384

}

385

if(not add_argument(getplugin(p_name, plugins), p)){

386

perror("add_argument");

387

return ARGP_ERR_UNKNOWN;

388

}

422

389

}

423

390

}

424

391

}

425

392

break;

426

case 'E': /* --env-for */

393

case 'f':

427

394

if(arg == NULL){

428

395

break;

429

396

}

432

399

if(envdef == NULL){

433

400

break;

434

401

}

435

*envdef = '\0';

436

if(not add_environment(getplugin(arg), envdef+1, true)){

402

char *p_name = strndup(arg, (size_t) (envdef-arg));

403

if(p_name == NULL){

404

break;

405

}

406

envdef++;

407

if(not add_environment(getplugin(p_name, plugins), envdef)){

437

408

perror("add_environment");

438

409

}

439

410

}

440

411

break;

441

case 'd': /* --disable */

412

case 'd':

442

413

if (arg != NULL){

443

plugin *p = getplugin(arg);

414

plugin *p = getplugin(arg, plugins);

444

415

if(p == NULL){

445

416

return ARGP_ERR_UNKNOWN;

446

417

}

447

418

p->disabled = true;

448

419

}

449

420

break;

450

case 'e': /* --enable */

451

if (arg != NULL){

452

plugin *p = getplugin(arg);

453

if(p == NULL){

454

return ARGP_ERR_UNKNOWN;

455

}

456

p->disabled = false;

457

}

458

break;

459

case 128: /* --plugin-dir */

460

free(plugindir);

461

plugindir = strdup(arg);

462

if(plugindir == NULL){

463

perror("strdup");

464

}

465

break;

466

case 129: /* --config-file */

467

/* This is already done by parse_opt_config_file() */

468

break;

469

case 130: /* --userid */

421

case 128:

422

plugindir = arg;

423

break;

424

case 129:

470

425

uid = (uid_t)strtol(arg, NULL, 10);

471

426

break;

472

case 131: /* --groupid */

427

case 130:

473

428

gid = (gid_t)strtol(arg, NULL, 10);

474

429

break;

475

case 132: /* --debug */

430

case 131:

476

431

debug = true;

477

432

break;

478

433

case ARGP_KEY_ARG:

486

441

return 0;

487

442

}

488

443

489

/* This option parser is the same as parse_opt() above, except it

490

ignores everything but the --config-file option. */

491

error_t parse_opt_config_file (int key, char *arg,

492

__attribute__((unused))

493

struct argp_state *state) {

494

switch (key) {

495

case 'g': /* --global-options */

496

case 'G': /* --global-env */

497

case 'o': /* --options-for */

498

case 'E': /* --env-for */

499

case 'd': /* --disable */

500

case 'e': /* --enable */

501

case 128: /* --plugin-dir */

502

break;

503

case 129: /* --config-file */

504

free(argfile);

505

argfile = strdup(arg);

506

if(argfile == NULL){

507

perror("strdup");

508

}

509

break;

510

case 130: /* --userid */

511

case 131: /* --groupid */

512

case 132: /* --debug */

513

case ARGP_KEY_ARG:

514

case ARGP_KEY_END:

515

break;

516

default:

517

return ARGP_ERR_UNKNOWN;

518

}

519

return 0;

520

}

444

plugin *plugin_list = NULL;

521

445

522

struct argp argp = { .options = options,

523

.parser = parse_opt_config_file,

524

.args_doc = "",

446

struct argp argp = { .options = options, .parser = parse_opt,

447

.args_doc = "[+PLUS_SEPARATED_OPTIONS]",

525

448

.doc = "Mandos plugin runner -- Run plugins" };

526

449

527

/* Parse using the parse_opt_config_file in order to get the custom

528

config file location, if any. */

529

ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);

450

ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);

530

451

if (ret == ARGP_ERR_UNKNOWN){

531

452

fprintf(stderr, "Unknown error while parsing arguments\n");

532

453

exitstatus = EXIT_FAILURE;

533

454

goto fallback;

534

455

}

535

536

/* Reset to the normal argument parser */

537

argp.parser = parse_opt;

538

539

/* Open the configfile if available */

540

if (argfile == NULL){

541

conffp = fopen(AFILE, "r");

542

} else {

543

conffp = fopen(argfile, "r");

544

}

456

457

conffp = fopen(argfile, "r");

545

458

if(conffp != NULL){

546

459

char *org_line = NULL;

547

460

char *p, *arg, *new_arg, *line;

550

463

const char whitespace_delims[] = " \r\t\f\v\n";

551

464

const char comment_delim[] = "#";

552

465

553

custom_argc = 1;

554

custom_argv = malloc(sizeof(char*) * 2);

555

if(custom_argv == NULL){

556

perror("malloc");

557

exitstatus = EXIT_FAILURE;

558

goto fallback;

559

}

560

custom_argv[0] = argv[0];

561

custom_argv[1] = NULL;

562

563

/* for each line in the config file, strip whitespace and ignore

564

commented text */

565

466

while(true){

566

467

sret = getline(&org_line, &size, conffp);

567

468

if(sret == -1){

575

476

continue;

576

477

}

577

478

new_arg = strdup(p);

578

if(new_arg == NULL){

579

perror("strdup");

580

exitstatus = EXIT_FAILURE;

581

free(org_line);

582

goto fallback;

583

}

584

585

custom_argc += 1;

586

custom_argv = realloc(custom_argv, sizeof(char *)

587

* ((unsigned int) custom_argc + 1));

588

if(custom_argv == NULL){

589

perror("realloc");

590

exitstatus = EXIT_FAILURE;

591

free(org_line);

592

goto fallback;

593

}

594

custom_argv[custom_argc-1] = new_arg;

595

custom_argv[custom_argc] = NULL;

479

custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);

480

if (custom_argv == NULL){

481

perror("add_to_argv");

482

exitstatus = EXIT_FAILURE;

483

goto fallback;

484

}

596

485

}

597

486

}

598

487

free(org_line);

599

} else {

488

} else{

600

489

/* Check for harmful errors and go to fallback. Other errors might

601

490

not affect opening plugins */

602

491

if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){

605

494

goto fallback;

606

495

}

607

496

}

608

/* If there was any arguments from configuration file,

609

pass them to parser as command arguments */

497

610

498

if(custom_argv != NULL){

611

ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,

612

0, NULL);

499

custom_argv[0] = argv[0];

500

ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);

613

501

if (ret == ARGP_ERR_UNKNOWN){

614

502

fprintf(stderr, "Unknown error while parsing arguments\n");

615

503

exitstatus = EXIT_FAILURE;

617

505

}

618

506

}

619

507

620

/* Parse actual command line arguments, to let them override the

621

config file */

622

ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);

623

if (ret == ARGP_ERR_UNKNOWN){

624

fprintf(stderr, "Unknown error while parsing arguments\n");

625

exitstatus = EXIT_FAILURE;

626

goto fallback;

627

}

628

629

508

if(debug){

630

509

for(plugin *p = plugin_list; p != NULL; p=p->next){

631

510

fprintf(stderr, "Plugin: %s has %d arguments\n",

640

519

}

641

520

}

642

521

643

/* Strip permissions down to nobody */

644

522

ret = setuid(uid);

645

523

if (ret == -1){

646

524

perror("setuid");

647

}

525

}

526

648

527

setgid(gid);

649

528

if (ret == -1){

650

529

perror("setgid");

651

530

}

652

531

653

if (plugindir == NULL){

654

dir = opendir(PDIR);

655

} else {

656

dir = opendir(plugindir);

657

}

658

532

dir = opendir(plugindir);

659

533

if(dir == NULL){

660

534

perror("Could not open plugin dir");

661

535

exitstatus = EXIT_FAILURE;

677

551

678

552

FD_ZERO(&rfds_all);

679

553

680

/* Read and execute any executable in the plugin directory*/

681

554

while(true){

682

555

dirst = readdir(dir);

683

556

684

/* All directory entries have been processed */

557

// All directory entries have been processed

685

558

if(dirst == NULL){

686

559

if (errno == EBADF){

687

560

perror("readdir");

693

566

694

567

d_name_len = strlen(dirst->d_name);

695

568

696

/* Ignore dotfiles, backup files and other junk */

569

// Ignore dotfiles, backup files and other junk

697

570

{

698

571

bool bad_name = false;

699

572

714

587

break;

715

588

}

716

589

}

590

717

591

if(bad_name){

718

592

continue;

719

593

}

594

720

595

for(const char **suf = bad_suffixes; *suf != NULL; suf++){

721

596

size_t suf_len = strlen(*suf);

722

597

if((d_name_len >= suf_len)

749

624

free(filename);

750

625

continue;

751

626

}

752

753

/* Ignore non-executable files */

627

754

628

if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){

755

629

if(debug){

756

630

fprintf(stderr, "Ignoring plugin dir entry \"%s\""

759

633

free(filename);

760

634

continue;

761

635

}

762

763

plugin *p = getplugin(dirst->d_name);

636

plugin *p = getplugin(dirst->d_name, &plugin_list);

764

637

if(p == NULL){

765

638

perror("getplugin");

766

639

free(filename);

776

649

}

777

650

{

778

651

/* Add global arguments to argument list for this plugin */

779

plugin *g = getplugin(NULL);

652

plugin *g = getplugin(NULL, &plugin_list);

780

653

if(g != NULL){

781

654

for(char **a = g->argv + 1; *a != NULL; a++){

782

655

if(not add_argument(p, *a)){

785

658

}

786

659

/* Add global environment variables */

787

660

for(char **e = g->environ; *e != NULL; e++){

788

if(not add_environment(p, *e, false)){

661

if(not add_environment(p, *e)){

789

662

perror("add_environment");

790

663

}

791

664

}

796

669

process, too. */

797

670

if(p->environ[0] != NULL){

798

671

for(char **e = environ; *e != NULL; e++){

799

if(not add_environment(p, *e, false)){

672

char *copy = strdup(*e);

673

if(copy == NULL){

674

perror("strdup");

675

continue;

676

}

677

if(not add_environment(p, copy)){

800

678

perror("add_environment");

801

679

}

802

680

}

803

681

}

804

682

805

int pipefd[2];

683

int pipefd[2];

806

684

ret = pipe(pipefd);

807

685

if (ret == -1){

808

686

perror("pipe");

809

687

exitstatus = EXIT_FAILURE;

810

688

goto fallback;

811

689

}

812

/* Ask OS to automatic close the pipe on exec */

813

690

ret = set_cloexec_flag(pipefd[0]);

814

691

if(ret < 0){

815

692

perror("set_cloexec_flag");

829

706

exitstatus = EXIT_FAILURE;

830

707

goto fallback;

831

708

}

832

/* Starting a new process to be watched */

709

// Starting a new process to be watched

833

710

pid_t pid = fork();

834

711

if(pid == -1){

835

712

perror("fork");

873

750

}

874

751

/* no return */

875

752

}

876

/* Parent process */

877

close(pipefd[1]); /* Close unused write end of pipe */

753

/* parent process */

878

754

free(filename);

879

plugin *new_plugin = getplugin(dirst->d_name);

880

if (new_plugin == NULL){

881

perror("getplugin");

755

close(pipefd[1]); /* close unused write end of pipe */

756

process *new_process = malloc(sizeof(process));

757

if (new_process == NULL){

758

perror("malloc");

882

759

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);

883

760

if(ret < 0){

884

perror("sigprocmask");

761

perror("sigprocmask");

885

762

}

886

763

exitstatus = EXIT_FAILURE;

887

764

goto fallback;

888

765

}

889

766

890

new_plugin->pid = pid;

891

new_plugin->fd = pipefd[0];

892

767

*new_process = (struct process){ .pid = pid,

768

.fd = pipefd[0],

769

.next = process_list };

770

// List handling

771

process_list = new_process;

893

772

/* Unblock SIGCHLD so signal handler can be run if this process

894

773

has already completed */

895

774

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);

899

778

goto fallback;

900

779

}

901

780

902

FD_SET(new_plugin->fd, &rfds_all);

781

FD_SET(new_process->fd, &rfds_all);

903

782

904

if (maxfd < new_plugin->fd){

905

maxfd = new_plugin->fd;

783

if (maxfd < new_process->fd){

784

maxfd = new_process->fd;

906

785

}

907

786

908

787

}

909

788

789

free_plugin_list(plugin_list);

790

910

791

closedir(dir);

911

792

dir = NULL;

912

913

for(plugin *p = plugin_list; p != NULL; p = p->next){

914

if(p->pid != 0){

915

break;

916

}

917

if(p->next == NULL){

918

fprintf(stderr, "No plugin processes started. Incorrect plugin"

919

" directory?\n");

920

free_plugin_list();

921

}

793

794

if (process_list == NULL){

795

fprintf(stderr, "No plugin processes started. Incorrect plugin"

796

" directory?\n");

797

process_list = NULL;

922

798

}

923

924

/* Main loop while running plugins exist */

925

while(plugin_list){

799

while(process_list){

926

800

fd_set rfds = rfds_all;

927

801

int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);

928

802

if (select_ret == -1){

932

806

}

933

807

/* OK, now either a process completed, or something can be read

934

808

from one of them */

935

for(plugin *proc = plugin_list; proc != NULL;){

809

for(process *proc = process_list; proc ; proc = proc->next){

936

810

/* Is this process completely done? */

937

811

if(proc->eof and proc->completed){

938

812

/* Only accept the plugin output if it exited cleanly */

939

813

if(not WIFEXITED(proc->status)

940

814

or WEXITSTATUS(proc->status) != 0){

941

815

/* Bad exit by plugin */

942

943

816

if(debug){

944

817

if(WIFEXITED(proc->status)){

945

818

fprintf(stderr, "Plugin %u exited with status %d\n",

954

827

(unsigned int) (proc->pid));

955

828

}

956

829

}

957

958

830

/* Remove the plugin */

959

831

FD_CLR(proc->fd, &rfds_all);

960

961

832

/* Block signal while modifying process_list */

962

ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);

833

ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);

963

834

if(ret < 0){

964

835

perror("sigprocmask");

965

836

exitstatus = EXIT_FAILURE;

966

837

goto fallback;

967

838

}

968

839

/* Delete this process entry from the list */

840

if(process_list == proc){

841

/* First one - simple */

842

process_list = proc->next;

843

} else {

844

/* Second one or later */

845

for(process *p = process_list; p != NULL; p = p->next){

846

if(p->next == proc){

847

p->next = proc->next;

848

break;

849

}

850

}

851

}

969

852

/* We are done modifying process list, so unblock signal */

970

853

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,

971

854

NULL);

972

855

if(ret < 0){

973

856

perror("sigprocmask");

974

exitstatus = EXIT_FAILURE;

975

goto fallback;

976

}

977

978

if(plugin_list == NULL){

979

break;

980

}

981

982

plugin *next_plugin = proc->next;

983

free_plugin(proc);

984

proc = next_plugin;

985

continue;

857

}

858

free(proc->buffer);

859

free(proc);

860

/* We deleted this process from the list, so we can't go

861

proc->next. Therefore, start over from the beginning of

862

the process list */

863

break;

986

864

}

987

988

865

/* This process exited nicely, so print its buffer */

989

866

990

bool bret = print_out_password(proc->buffer,

991

proc->buffer_length);

867

bool bret = print_out_password(proc->buffer, proc->buffer_length);

992

868

if(not bret){

993

869

perror("print_out_password");

994

870

exitstatus = EXIT_FAILURE;

995

871

}

996

872

goto fallback;

997

873

}

998

999

874

/* This process has not completed. Does it have any output? */

1000

875

if(proc->eof or not FD_ISSET(proc->fd, &rfds)){

1001

876

/* This process had nothing to say at this time */

1002

proc = proc->next;

1003

877

continue;

1004

878

}

1005

879

/* Before reading, make the process' data buffer large enough */

1018

892

BUFFER_SIZE);

1019

893

if(ret < 0){

1020

894

/* Read error from this process; ignore the error */

1021

proc = proc->next;

1022

895

continue;

1023

896

}

1024

897

if(ret == 0){

1033

906

1034

907

fallback:

1035

908

1036

if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){

1037

/* Fallback if all plugins failed, none are found or an error

1038

occured */

909

if(process_list == NULL or exitstatus != EXIT_SUCCESS){

910

/* Fallback if all plugins failed, none are found or an error occured */

1039

911

bool bret;

1040

912

fprintf(stderr, "Going to fallback mode using getpass(3)\n");

1041

913

char *passwordbuffer = getpass("Password: ");

1054

926

}

1055

927

1056

928

if(custom_argv != NULL){

1057

for(char **arg = custom_argv+1; *arg != NULL; arg++){

929

for(char **arg = custom_argv; *arg != NULL; arg++){

1058

930

free(*arg);

1059

931

}

1060

932

free(custom_argv);

1061

933

}

934

free_plugin_list(plugin_list);

1062

935

1063

936

if(dir != NULL){

1064

937

closedir(dir);

1065

938

}

1066

939

1067

940

/* Free the process list and kill the processes */

1068

for(plugin *p = plugin_list; p != NULL; p = p->next){

1069

if(p->pid != 0){

1070

close(p->fd);

1071

ret = kill(p->pid, SIGTERM);

1072

if(ret == -1 and errno != ESRCH){

1073

/* Set-uid proccesses might not get closed */

1074

perror("kill");

1075

}

941

for(process *next; process_list != NULL; process_list = next){

942

next = process_list->next;

943

close(process_list->fd);

944

ret = kill(process_list->pid, SIGTERM);

945

if(ret == -1 and errno != ESRCH){

946

/* set-uid proccesses migth not get closed */

947

perror("kill");

1076

948

}

949

free(process_list->buffer);

950

free(process_list);

1077

951

}

1078

952

1079

953

/* Wait for any remaining child processes to terminate */

1083

957

if(errno != ECHILD){

1084

958

perror("wait");

1085

959

}

1086

1087

free_plugin_list();

1088

1089

free(plugindir);

1090

free(argfile);

1091

960

1092

961

return exitstatus;

1093

962

}