/mandos/trunk : revision 101

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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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64

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

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66

#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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91

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,

123

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

136

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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136

return NULL;

142

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

}

149

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){

183

177

if(p == NULL){

184

178

return false;

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179

}

186

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

187

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

188

/* Search for this environment variable */

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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){

193

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

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if(new == NULL){

195

return false;

196

}

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*e = new;

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strcpy(*e, def);

199

}

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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

184

/*

207

185

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

208

186

* Descriptor Flags".

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197

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

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198

}

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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;

258

225

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

268

235

return true;

269

236

}

270

237

271

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

272

static void free_plugin(plugin *plugin_node){

273

274

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

}

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;

295

244

}

296

}

297

298

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;

299

257

}

300

258

301

static void free_plugin_list(void){

302

while(plugin_list != NULL){

303

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);

304

271

}

305

272

}

306

273

307

274

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

308

char *plugindir = NULL;

309

char *argfile = NULL;

275

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

276

const char *argfile = ARGFILE;

310

277

FILE *conffp;

311

278

size_t d_name_len;

312

279

DIR *dir = NULL;

344

311

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

345

312

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

346

313

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

347

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

314

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

348

315

.arg = "VAR=value",

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316

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

350

317

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

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

352

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

353

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

320

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

354

321

.arg = "PLUGIN:ENV=value",

355

322

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

356

323

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

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.arg = "PLUGIN",

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

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

360

.arg = "PLUGIN",

361

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

362

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

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327

.arg = "DIRECTORY",

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328

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

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

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.arg = "FILE",

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

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

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

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

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

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

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

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

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

329

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

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.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 },

376

337

{ .name = NULL }

377

338

};

378

339

379

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

380

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;

381

344

switch (key) {

382

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

345

case 'g':

383

346

if (arg != NULL){

384

347

char *p;

385

348

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

386

349

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

387

350

continue;

388

351

}

389

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

352

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

390

353

perror("add_argument");

391

354

return ARGP_ERR_UNKNOWN;

392

355

}

393

356

}

394

357

}

395

358

break;

396

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

359

case 'e':

397

360

if(arg == NULL){

398

361

break;

399

362

}

402

365

if(envdef == NULL){

403

366

break;

404

367

}

405

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

368

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

406

369

perror("add_environment");

407

370

}

408

371

}

409

372

break;

410

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

373

case 'o':

411

374

if (arg != NULL){

412

375

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

413

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

376

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

414

377

break;

415

378

}

416

379

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

417

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

380

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

418

381

break;

419

382

}

420

char *p;

421

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

422

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

423

continue;

424

}

425

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

426

perror("add_argument");

427

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

}

428

393

}

429

394

}

430

395

}

431

396

break;

432

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

397

case 'f':

433

398

if(arg == NULL){

434

399

break;

435

400

}

443

408

break;

444

409

}

445

410

envdef++;

446

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

411

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

447

412

perror("add_environment");

448

413

}

449

414

}

450

415

break;

451

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

416

case 'd':

452

417

if (arg != NULL){

453

plugin *p = getplugin(arg);

418

plugin *p = getplugin(arg, plugins);

454

419

if(p == NULL){

455

420

return ARGP_ERR_UNKNOWN;

456

421

}

457

422

p->disabled = true;

458

423

}

459

424

break;

460

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

461

if (arg != NULL){

462

plugin *p = getplugin(arg);

463

if(p == NULL){

464

return ARGP_ERR_UNKNOWN;

465

}

466

p->disabled = false;

467

}

468

break;

469

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

470

plugindir = strdup(arg);

471

if(plugindir == NULL){

472

perror("strdup");

473

}

474

break;

475

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

476

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

477

break;

478

case 130: /* --userid */

425

case 128:

426

plugindir = arg;

427

break;

428

case 129:

479

429

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

480

430

break;

481

case 131: /* --groupid */

431

case 130:

482

432

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

483

433

break;

484

case 132: /* --debug */

434

case 131:

485

435

debug = true;

486

436

break;

487

437

case ARGP_KEY_ARG:

495

445

return 0;

496

446

}

497

447

498

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

499

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

500

error_t parse_opt_config_file (int key, char *arg,

501

__attribute__((unused))

502

struct argp_state *state) {

503

switch (key) {

504

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

505

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

506

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

507

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

508

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

509

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

510

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

511

break;

512

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

513

argfile = strdup(arg);

514

if(argfile == NULL){

515

perror("strdup");

516

}

517

break;

518

case 130: /* --userid */

519

case 131: /* --groupid */

520

case 132: /* --debug */

521

case ARGP_KEY_ARG:

522

case ARGP_KEY_END:

523

break;

524

default:

525

return ARGP_ERR_UNKNOWN;

526

}

527

return 0;

528

}

448

plugin *plugin_list = NULL;

529

449

530

struct argp argp = { .options = options,

531

.parser = parse_opt_config_file,

532

.args_doc = "",

450

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

451

.args_doc = "[+PLUS_SEPARATED_OPTIONS]",

533

452

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

534

453

535

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

536

config file location, if any. */

537

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

454

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

538

455

if (ret == ARGP_ERR_UNKNOWN){

539

456

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

540

457

exitstatus = EXIT_FAILURE;

541

458

goto fallback;

542

459

}

543

544

/* Reset to the normal argument parser */

545

argp.parser = parse_opt;

546

547

/* Open the configfile if available */

548

if (argfile == NULL){

549

conffp = fopen(AFILE, "r");

550

} else {

551

conffp = fopen(argfile, "r");

552

}

460

461

conffp = fopen(argfile, "r");

553

462

if(conffp != NULL){

554

463

char *org_line = NULL;

555

464

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

558

467

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

559

468

const char comment_delim[] = "#";

560

469

561

custom_argc = 1;

562

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

563

if(custom_argv == NULL){

564

perror("malloc");

565

exitstatus = EXIT_FAILURE;

566

goto fallback;

567

}

568

custom_argv[0] = argv[0];

569

custom_argv[1] = NULL;

570

571

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

572

commented text */

573

470

while(true){

574

471

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

575

472

if(sret == -1){

583

480

continue;

584

481

}

585

482

new_arg = strdup(p);

586

if(new_arg == NULL){

587

perror("strdup");

588

exitstatus = EXIT_FAILURE;

589

free(org_line);

590

goto fallback;

591

}

592

593

custom_argc += 1;

594

custom_argv = realloc(custom_argv, sizeof(char *)

595

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

596

if(custom_argv == NULL){

597

perror("realloc");

598

exitstatus = EXIT_FAILURE;

599

free(org_line);

600

goto fallback;

601

}

602

custom_argv[custom_argc-1] = new_arg;

603

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

}

604

489

}

605

490

}

606

491

free(org_line);

607

} else {

492

} else{

608

493

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

609

494

not affect opening plugins */

610

495

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

613

498

goto fallback;

614

499

}

615

500

}

616

/* If there was any arguments from configuration file,

617

pass them to parser as command arguments */

501

618

502

if(custom_argv != NULL){

619

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

620

0, NULL);

503

custom_argv[0] = argv[0];

504

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

621

505

if (ret == ARGP_ERR_UNKNOWN){

622

506

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

623

507

exitstatus = EXIT_FAILURE;

625

509

}

626

510

}

627

511

628

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

629

config file */

630

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

631

if (ret == ARGP_ERR_UNKNOWN){

632

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

633

exitstatus = EXIT_FAILURE;

634

goto fallback;

635

}

636

637

512

if(debug){

638

513

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

639

514

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

648

523

}

649

524

}

650

525

651

/* Strip permissions down to nobody */

652

526

ret = setuid(uid);

653

527

if (ret == -1){

654

528

perror("setuid");

655

}

529

}

530

656

531

setgid(gid);

657

532

if (ret == -1){

658

533

perror("setgid");

659

534

}

660

535

661

if (plugindir == NULL){

662

dir = opendir(PDIR);

663

} else {

664

dir = opendir(plugindir);

665

}

666

536

dir = opendir(plugindir);

667

537

if(dir == NULL){

668

538

perror("Could not open plugin dir");

669

539

exitstatus = EXIT_FAILURE;

685

555

686

556

FD_ZERO(&rfds_all);

687

557

688

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

689

558

while(true){

690

559

dirst = readdir(dir);

691

560

692

/* All directory entries have been processed */

561

// All directory entries have been processed

693

562

if(dirst == NULL){

694

563

if (errno == EBADF){

695

564

perror("readdir");

701

570

702

571

d_name_len = strlen(dirst->d_name);

703

572

704

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

573

// Ignore dotfiles, backup files and other junk

705

574

{

706

575

bool bad_name = false;

707

576

722

591

break;

723

592

}

724

593

}

594

725

595

if(bad_name){

726

596

continue;

727

597

}

598

728

599

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

729

600

size_t suf_len = strlen(*suf);

730

601

if((d_name_len >= suf_len)

757

628

free(filename);

758

629

continue;

759

630

}

760

761

/* Ignore non-executable files */

631

762

632

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

763

633

if(debug){

764

634

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

767

637

free(filename);

768

638

continue;

769

639

}

770

771

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

640

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

772

641

if(p == NULL){

773

642

perror("getplugin");

774

643

free(filename);

784

653

}

785

654

{

786

655

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

787

plugin *g = getplugin(NULL);

656

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

788

657

if(g != NULL){

789

658

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

790

659

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

793

662

}

794

663

/* Add global environment variables */

795

664

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

796

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

665

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

797

666

perror("add_environment");

798

667

}

799

668

}

804

673

process, too. */

805

674

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

806

675

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

807

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)){

808

682

perror("add_environment");

809

683

}

810

684

}

817

691

exitstatus = EXIT_FAILURE;

818

692

goto fallback;

819

693

}

820

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

821

694

ret = set_cloexec_flag(pipefd[0]);

822

695

if(ret < 0){

823

696

perror("set_cloexec_flag");

837

710

exitstatus = EXIT_FAILURE;

838

711

goto fallback;

839

712

}

840

/* Starting a new process to be watched */

713

// Starting a new process to be watched

841

714

pid_t pid = fork();

842

715

if(pid == -1){

843

716

perror("fork");

881

754

}

882

755

/* no return */

883

756

}

884

/* Parent process */

885

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

757

/* parent process */

886

758

free(filename);

887

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

888

if (new_plugin == NULL){

889

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");

890

763

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

891

764

if(ret < 0){

892

perror("sigprocmask");

765

perror("sigprocmask");

893

766

}

894

767

exitstatus = EXIT_FAILURE;

895

768

goto fallback;

896

769

}

897

770

898

new_plugin->pid = pid;

899

new_plugin->fd = pipefd[0];

900

771

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

772

.fd = pipefd[0],

773

.next = process_list };

774

// List handling

775

process_list = new_process;

901

776

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

902

777

has already completed */

903

778

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

907

782

goto fallback;

908

783

}

909

784

910

FD_SET(new_plugin->fd, &rfds_all);

785

FD_SET(new_process->fd, &rfds_all);

911

786

912

if (maxfd < new_plugin->fd){

913

maxfd = new_plugin->fd;

787

if (maxfd < new_process->fd){

788

maxfd = new_process->fd;

914

789

}

915

790

916

791

}

917

792

793

free_plugin_list(plugin_list);

794

plugin_list = NULL;

795

918

796

closedir(dir);

919

797

dir = NULL;

920

921

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

922

if(p->pid != 0){

923

break;

924

}

925

if(p->next == NULL){

926

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

927

" directory?\n");

928

free_plugin_list();

929

}

798

799

if (process_list == NULL){

800

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

801

" directory?\n");

802

process_list = NULL;

930

803

}

931

932

/* Main loop while running plugins exist */

933

while(plugin_list){

804

while(process_list){

934

805

fd_set rfds = rfds_all;

935

806

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

936

807

if (select_ret == -1){

940

811

}

941

812

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

942

813

from one of them */

943

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

814

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

944

815

/* Is this process completely done? */

945

816

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

946

817

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

947

818

if(not WIFEXITED(proc->status)

948

819

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

949

820

/* Bad exit by plugin */

950

951

821

if(debug){

952

822

if(WIFEXITED(proc->status)){

953

823

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

962

832

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

963

833

}

964

834

}

965

966

835

/* Remove the plugin */

967

836

FD_CLR(proc->fd, &rfds_all);

968

969

837

/* Block signal while modifying process_list */

970

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

838

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

971

839

if(ret < 0){

972

840

perror("sigprocmask");

973

841

exitstatus = EXIT_FAILURE;

974

842

goto fallback;

975

843

}

976

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

}

977

857

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

978

858

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,

979

859

NULL);

980

860

if(ret < 0){

981

861

perror("sigprocmask");

982

exitstatus = EXIT_FAILURE;

983

goto fallback;

984

}

985

986

if(plugin_list == NULL){

987

break;

988

}

989

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;

990

869

}

991

992

870

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

993

871

994

bool bret = print_out_password(proc->buffer,

995

proc->buffer_length);

872

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

996

873

if(not bret){

997

874

perror("print_out_password");

998

875

exitstatus = EXIT_FAILURE;

999

876

}

1000

877

goto fallback;

1001

878

}

1002

1003

879

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

1004

880

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

1005

881

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

1035

911

1036

912

fallback:

1037

913

1038

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

1039

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

1040

occured */

914

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

915

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

1041

916

bool bret;

1042

917

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

1043

918

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

1056

931

}

1057

932

1058

933

if(custom_argv != NULL){

1059

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

934

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

1060

935

free(*arg);

1061

936

}

1062

937

free(custom_argv);

1063

938

}

939

free_plugin_list(plugin_list);

1064

940

1065

941

if(dir != NULL){

1066

942

closedir(dir);

1067

943

}

1068

944

1069

945

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

1070

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

1071

if(p->pid != 0){

1072

close(p->fd);

1073

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

1074

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

1075

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

1076

perror("kill");

1077

}

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");

1078

953

}

954

free(process_list->buffer);

955

free(process_list);

1079

956

}

1080

957

1081

958

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

1085

962

if(errno != ECHILD){

1086

963

perror("wait");

1087

964

}

1088

1089

free_plugin_list();

1090

1091

free(plugindir);

1092

free(argfile);

1093

965

1094

966

return exitstatus;

1095

967

}