/mandos/release : revision 100

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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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74

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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90

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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99

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

106

100

return p;

121

115

122

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

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117

.argc = 1,

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.envc = 0,

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.disabled = false,

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.next = plugin_list };

120

.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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127

}

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128

new_plugin->argv[0] = copy_name;

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129

new_plugin->argv[1] = NULL;

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130

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131

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

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132

if(new_plugin->environ == NULL){

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133

free(copy_name);

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return NULL;

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137

}

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138

new_plugin->environ[0] = NULL;

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145

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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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141

return new_plugin;

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142

}

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143

179

173

}

180

174

181

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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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177

if(p == NULL){

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return false;

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179

}

186

/* 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 */

189

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

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

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/* It already exists */

192

if(replace){

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

194

if(new == NULL){

195

return false;

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}

197

*e = new;

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strcpy(*e, def);

199

}

200

return true;

201

}

202

}

203

180

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

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181

}

205

182

183

206

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/*

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185

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

208

186

* Descriptor Flags".

219

197

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

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198

}

221

199

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process *process_list = NULL;

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201

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. */

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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

242

/* 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){

247

/* Process not found in process list */

248

continue;

249

}

250

proc->status = status;

251

proc->completed = true;

252

}

205

process *proc = process_list;

206

int status;

207

pid_t pid = wait(&status);

208

if(pid == -1){

209

perror("wait");

210

return;

211

}

212

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

213

proc = proc->next;

214

}

215

if(proc == NULL){

216

/* Process not found in process list */

217

return;

218

}

219

proc->status = status;

220

proc->completed = true;

253

221

}

254

222

255

/* Prints out a password to stdout */

256

223

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

257

224

ssize_t ret;

225

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

226

length--;

227

}

258

228

for(size_t written = 0; written < length; written += (size_t)ret){

259

229

ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,

260

230

length - written));

265

235

return true;

266

236

}

267

237

268

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

269

static void free_plugin(plugin *plugin_node){

270

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

272

free(*arg);

273

}

274

free(plugin_node->argv);

275

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

276

free(*env);

277

}

278

free(plugin_node->environ);

279

free(plugin_node->buffer);

280

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

282

if(plugin_node == plugin_list){

283

/* First one - simple */

284

plugin_list = plugin_list->next;

285

} else {

286

/* Second one or later */

287

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

288

if(p->next == plugin_node){

289

p->next = plugin_node->next;

290

break;

291

}

238

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

239

if (argv == NULL){

240

*argc = 1;

241

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

242

if(argv == NULL){

243

return NULL;

292

244

}

293

}

294

295

free(plugin_node);

245

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

246

argv[1] = NULL;

247

}

248

*argc += 1;

249

argv = realloc(argv, sizeof(char *)

250

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

251

if(argv == NULL){

252

return NULL;

253

}

254

argv[*argc-1] = arg;

255

argv[*argc] = NULL;

256

return argv;

296

257

}

297

258

298

static void free_plugin_list(void){

299

while(plugin_list != NULL){

300

free_plugin(plugin_list);

259

static void free_plugin_list(plugin *plugin_list){

260

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

261

next = plugin_list->next;

262

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

263

free(*arg);

264

}

265

free(plugin_list->argv);

266

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

267

free(*env);

268

}

269

free(plugin_list->environ);

270

free(plugin_list);

301

271

}

302

272

}

303

273

304

274

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

305

char *plugindir = NULL;

306

char *argfile = NULL;

275

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

276

const char *argfile = ARGFILE;

307

277

FILE *conffp;

308

278

size_t d_name_len;

309

279

DIR *dir = NULL;

341

311

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

342

312

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

343

313

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

344

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

314

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

345

315

.arg = "VAR=value",

346

316

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

347

317

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

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

349

319

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

350

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

320

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

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321

.arg = "PLUGIN:ENV=value",

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

353

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

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.arg = "PLUGIN",

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

356

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

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.arg = "PLUGIN",

358

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

359

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

360

327

.arg = "DIRECTORY",

361

328

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

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

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.arg = "FILE",

364

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

365

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

366

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

367

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

368

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

369

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

370

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

371

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

372

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

329

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

330

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

331

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

332

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

333

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

334

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

335

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

336

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

373

337

{ .name = NULL }

374

338

};

375

339

376

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

377

struct argp_state *state) {

340

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

341

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

342

pointer to our plugin list pointer. */

343

plugin **plugins = state->input;

378

344

switch (key) {

379

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

345

case 'g':

380

346

if (arg != NULL){

381

347

char *p;

382

348

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

383

349

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

384

350

continue;

385

351

}

386

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

352

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

387

353

perror("add_argument");

388

354

return ARGP_ERR_UNKNOWN;

389

355

}

390

356

}

391

357

}

392

358

break;

393

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

359

case 'e':

394

360

if(arg == NULL){

395

361

break;

396

362

}

399

365

if(envdef == NULL){

400

366

break;

401

367

}

402

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

368

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

403

369

perror("add_environment");

404

370

}

405

371

}

406

372

break;

407

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

373

case 'o':

408

374

if (arg != NULL){

409

375

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

410

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

376

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

411

377

break;

412

378

}

413

379

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

414

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

380

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

415

381

break;

416

382

}

417

char *p;

418

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

419

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

420

continue;

421

}

422

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

423

perror("add_argument");

424

return ARGP_ERR_UNKNOWN;

383

if(opt != NULL){

384

char *p;

385

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

386

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

387

continue;

388

}

389

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

390

perror("add_argument");

391

return ARGP_ERR_UNKNOWN;

392

}

425

393

}

426

394

}

427

395

}

428

396

break;

429

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

397

case 'f':

430

398

if(arg == NULL){

431

399

break;

432

400

}

440

408

break;

441

409

}

442

410

envdef++;

443

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

411

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

444

412

perror("add_environment");

445

413

}

446

414

}

447

415

break;

448

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

416

case 'd':

449

417

if (arg != NULL){

450

plugin *p = getplugin(arg);

418

plugin *p = getplugin(arg, plugins);

451

419

if(p == NULL){

452

420

return ARGP_ERR_UNKNOWN;

453

421

}

454

422

p->disabled = true;

455

423

}

456

424

break;

457

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

458

if (arg != NULL){

459

plugin *p = getplugin(arg);

460

if(p == NULL){

461

return ARGP_ERR_UNKNOWN;

462

}

463

p->disabled = false;

464

}

465

break;

466

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

467

plugindir = strdup(arg);

468

if(plugindir == NULL){

469

perror("strdup");

470

}

471

break;

472

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

473

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

474

break;

475

case 130: /* --userid */

425

case 128:

426

plugindir = arg;

427

break;

428

case 129:

476

429

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

477

430

break;

478

case 131: /* --groupid */

431

case 130:

479

432

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

480

433

break;

481

case 132: /* --debug */

434

case 131:

482

435

debug = true;

483

436

break;

484

437

case ARGP_KEY_ARG:

492

445

return 0;

493

446

}

494

447

495

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

496

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

497

error_t parse_opt_config_file (int key, char *arg,

498

__attribute__((unused))

499

struct argp_state *state) {

500

switch (key) {

501

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

502

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

503

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

504

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

505

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

506

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

507

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

508

break;

509

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

510

argfile = strdup(arg);

511

if(argfile == NULL){

512

perror("strdup");

513

}

514

break;

515

case 130: /* --userid */

516

case 131: /* --groupid */

517

case 132: /* --debug */

518

case ARGP_KEY_ARG:

519

case ARGP_KEY_END:

520

break;

521

default:

522

return ARGP_ERR_UNKNOWN;

523

}

524

return 0;

525

}

448

plugin *plugin_list = NULL;

526

449

527

struct argp argp = { .options = options,

528

.parser = parse_opt_config_file,

529

.args_doc = "",

450

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

451

.args_doc = "[+PLUS_SEPARATED_OPTIONS]",

530

452

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

531

453

532

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

533

config file location, if any. */

534

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

454

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

535

455

if (ret == ARGP_ERR_UNKNOWN){

536

456

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

537

457

exitstatus = EXIT_FAILURE;

538

458

goto fallback;

539

459

}

540

541

/* Reset to the normal argument parser */

542

argp.parser = parse_opt;

543

544

/* Open the configfile if available */

545

if (argfile == NULL){

546

conffp = fopen(AFILE, "r");

547

} else {

548

conffp = fopen(argfile, "r");

549

}

460

461

conffp = fopen(argfile, "r");

550

462

if(conffp != NULL){

551

463

char *org_line = NULL;

552

464

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

555

467

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

556

468

const char comment_delim[] = "#";

557

469

558

custom_argc = 1;

559

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

560

if(custom_argv == NULL){

561

perror("malloc");

562

exitstatus = EXIT_FAILURE;

563

goto fallback;

564

}

565

custom_argv[0] = argv[0];

566

custom_argv[1] = NULL;

567

568

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

569

commented text */

570

470

while(true){

571

471

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

572

472

if(sret == -1){

580

480

continue;

581

481

}

582

482

new_arg = strdup(p);

583

if(new_arg == NULL){

584

perror("strdup");

585

exitstatus = EXIT_FAILURE;

586

free(org_line);

587

goto fallback;

588

}

589

590

custom_argc += 1;

591

custom_argv = realloc(custom_argv, sizeof(char *)

592

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

593

if(custom_argv == NULL){

594

perror("realloc");

595

exitstatus = EXIT_FAILURE;

596

free(org_line);

597

goto fallback;

598

}

599

custom_argv[custom_argc-1] = new_arg;

600

custom_argv[custom_argc] = NULL;

483

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

484

if (custom_argv == NULL){

485

perror("add_to_argv");

486

exitstatus = EXIT_FAILURE;

487

goto fallback;

488

}

601

489

}

602

490

}

603

491

free(org_line);

604

} else {

492

} else{

605

493

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

606

494

not affect opening plugins */

607

495

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

610

498

goto fallback;

611

499

}

612

500

}

613

/* If there was any arguments from configuration file,

614

pass them to parser as command arguments */

501

615

502

if(custom_argv != NULL){

616

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

617

0, NULL);

503

custom_argv[0] = argv[0];

504

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

618

505

if (ret == ARGP_ERR_UNKNOWN){

619

506

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

620

507

exitstatus = EXIT_FAILURE;

622

509

}

623

510

}

624

511

625

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

626

config file */

627

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

628

if (ret == ARGP_ERR_UNKNOWN){

629

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

630

exitstatus = EXIT_FAILURE;

631

goto fallback;

632

}

633

634

512

if(debug){

635

513

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

636

514

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

645

523

}

646

524

}

647

525

648

/* Strip permissions down to nobody */

649

526

ret = setuid(uid);

650

527

if (ret == -1){

651

528

perror("setuid");

652

}

529

}

530

653

531

setgid(gid);

654

532

if (ret == -1){

655

533

perror("setgid");

656

534

}

657

535

658

if (plugindir == NULL){

659

dir = opendir(PDIR);

660

} else {

661

dir = opendir(plugindir);

662

}

663

536

dir = opendir(plugindir);

664

537

if(dir == NULL){

665

538

perror("Could not open plugin dir");

666

539

exitstatus = EXIT_FAILURE;

682

555

683

556

FD_ZERO(&rfds_all);

684

557

685

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

686

558

while(true){

687

559

dirst = readdir(dir);

688

560

689

/* All directory entries have been processed */

561

// All directory entries have been processed

690

562

if(dirst == NULL){

691

563

if (errno == EBADF){

692

564

perror("readdir");

698

570

699

571

d_name_len = strlen(dirst->d_name);

700

572

701

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

573

// Ignore dotfiles, backup files and other junk

702

574

{

703

575

bool bad_name = false;

704

576

719

591

break;

720

592

}

721

593

}

594

722

595

if(bad_name){

723

596

continue;

724

597

}

598

725

599

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

726

600

size_t suf_len = strlen(*suf);

727

601

if((d_name_len >= suf_len)

742

616

}

743

617

744

618

char *filename;

745

if(plugindir == NULL){

746

ret = asprintf(&filename, PDIR "/%s", dirst->d_name);

747

} else {

748

ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);

749

}

619

ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);

750

620

if(ret < 0){

751

621

perror("asprintf");

752

622

continue;

758

628

free(filename);

759

629

continue;

760

630

}

761

762

/* Ignore non-executable files */

631

763

632

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

764

633

if(debug){

765

634

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

768

637

free(filename);

769

638

continue;

770

639

}

771

772

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

640

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

773

641

if(p == NULL){

774

642

perror("getplugin");

775

643

free(filename);

785

653

}

786

654

{

787

655

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

788

plugin *g = getplugin(NULL);

656

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

789

657

if(g != NULL){

790

658

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

791

659

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

794

662

}

795

663

/* Add global environment variables */

796

664

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

797

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

665

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

798

666

perror("add_environment");

799

667

}

800

668

}

805

673

process, too. */

806

674

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

807

675

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

808

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

676

char *copy = strdup(*e);

677

if(copy == NULL){

678

perror("strdup");

679

continue;

680

}

681

if(not add_environment(p, copy)){

809

682

perror("add_environment");

810

683

}

811

684

}

818

691

exitstatus = EXIT_FAILURE;

819

692

goto fallback;

820

693

}

821

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

822

694

ret = set_cloexec_flag(pipefd[0]);

823

695

if(ret < 0){

824

696

perror("set_cloexec_flag");

838

710

exitstatus = EXIT_FAILURE;

839

711

goto fallback;

840

712

}

841

/* Starting a new process to be watched */

713

// Starting a new process to be watched

842

714

pid_t pid = fork();

843

715

if(pid == -1){

844

716

perror("fork");

882

754

}

883

755

/* no return */

884

756

}

885

/* Parent process */

886

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

757

/* parent process */

887

758

free(filename);

888

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

889

if (new_plugin == NULL){

890

perror("getplugin");

759

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

760

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

761

if (new_process == NULL){

762

perror("malloc");

891

763

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

892

764

if(ret < 0){

893

perror("sigprocmask");

765

perror("sigprocmask");

894

766

}

895

767

exitstatus = EXIT_FAILURE;

896

768

goto fallback;

897

769

}

898

770

899

new_plugin->pid = pid;

900

new_plugin->fd = pipefd[0];

901

771

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

772

.fd = pipefd[0],

773

.next = process_list };

774

// List handling

775

process_list = new_process;

902

776

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

903

777

has already completed */

904

778

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

908

782

goto fallback;

909

783

}

910

784

911

FD_SET(new_plugin->fd, &rfds_all);

785

FD_SET(new_process->fd, &rfds_all);

912

786

913

if (maxfd < new_plugin->fd){

914

maxfd = new_plugin->fd;

787

if (maxfd < new_process->fd){

788

maxfd = new_process->fd;

915

789

}

916

790

917

791

}

918

792

793

free_plugin_list(plugin_list);

794

plugin_list = NULL;

795

919

796

closedir(dir);

920

797

dir = NULL;

921

922

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

923

if(p->pid != 0){

924

break;

925

}

926

if(p->next == NULL){

927

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

928

" directory?\n");

929

free_plugin_list();

930

}

798

799

if (process_list == NULL){

800

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

801

" directory?\n");

802

process_list = NULL;

931

803

}

932

933

/* Main loop while running plugins exist */

934

while(plugin_list){

804

while(process_list){

935

805

fd_set rfds = rfds_all;

936

806

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

937

807

if (select_ret == -1){

941

811

}

942

812

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

943

813

from one of them */

944

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

814

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

945

815

/* Is this process completely done? */

946

816

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

947

817

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

948

818

if(not WIFEXITED(proc->status)

949

819

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

950

820

/* Bad exit by plugin */

951

952

821

if(debug){

953

822

if(WIFEXITED(proc->status)){

954

823

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

963

832

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

964

833

}

965

834

}

966

967

835

/* Remove the plugin */

968

836

FD_CLR(proc->fd, &rfds_all);

969

970

837

/* Block signal while modifying process_list */

971

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

838

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

972

839

if(ret < 0){

973

840

perror("sigprocmask");

974

841

exitstatus = EXIT_FAILURE;

975

842

goto fallback;

976

843

}

977

free_plugin(proc);

844

/* Delete this process entry from the list */

845

if(process_list == proc){

846

/* First one - simple */

847

process_list = proc->next;

848

} else {

849

/* Second one or later */

850

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

851

if(p->next == proc){

852

p->next = proc->next;

853

break;

854

}

855

}

856

}

978

857

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

979

858

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,

980

859

NULL);

981

860

if(ret < 0){

982

861

perror("sigprocmask");

983

exitstatus = EXIT_FAILURE;

984

goto fallback;

985

}

986

987

if(plugin_list == NULL){

988

break;

989

}

990

continue;

862

}

863

free(proc->buffer);

864

free(proc);

865

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

866

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

867

the process list */

868

break;

991

869

}

992

993

870

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

994

871

995

bool bret = print_out_password(proc->buffer,

996

proc->buffer_length);

872

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

997

873

if(not bret){

998

874

perror("print_out_password");

999

875

exitstatus = EXIT_FAILURE;

1000

876

}

1001

877

goto fallback;

1002

878

}

1003

1004

879

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

1005

880

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

1006

881

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

1036

911

1037

912

fallback:

1038

913

1039

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

1040

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

1041

occured */

914

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

915

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

1042

916

bool bret;

1043

917

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

1044

918

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

1045

size_t len = strlen(passwordbuffer);

1046

/* Strip trailing newline */

1047

if(len > 0 and passwordbuffer[len-1] == '\n'){

1048

passwordbuffer[len-1] = '\0'; /* not strictly necessary */

1049

len--;

1050

}

1051

bret = print_out_password(passwordbuffer, len);

919

bret = print_out_password(passwordbuffer, strlen(passwordbuffer));

1052

920

if(not bret){

1053

921

perror("print_out_password");

1054

922

exitstatus = EXIT_FAILURE;

1063

931

}

1064

932

1065

933

if(custom_argv != NULL){

1066

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

934

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

1067

935

free(*arg);

1068

936

}

1069

937

free(custom_argv);

1070

938

}

939

free_plugin_list(plugin_list);

1071

940

1072

941

if(dir != NULL){

1073

942

closedir(dir);

1074

943

}

1075

944

1076

945

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

1077

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

1078

if(p->pid != 0){

1079

close(p->fd);

1080

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

1081

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

1082

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

1083

perror("kill");

1084

}

946

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

947

next = process_list->next;

948

close(process_list->fd);

949

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

950

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

951

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

952

perror("kill");

1085

953

}

954

free(process_list->buffer);

955

free(process_list);

1086

956

}

1087

957

1088

958

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

1092

962

if(errno != ECHILD){

1093

963

perror("wait");

1094

964

}

1095

1096

free_plugin_list();

1097

1098

free(plugindir);

1099

free(argfile);

1100

965

1101

966

return exitstatus;

1102

967

}