/mandos/trunk : revision 165

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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, error_t */

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ARGP_KEY_END, ARGP_KEY_ARG,

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

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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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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 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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struct plugin;

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

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

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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 */

101

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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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;

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111

if (new_plugin == NULL){

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112

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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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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}

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

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123

.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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126

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

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128

if (new_plugin->argv == NULL){

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free(copy_name);

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free(new_plugin);

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131

return NULL;

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132

}

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133

new_plugin->argv[0] = copy_name;

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134

new_plugin->argv[1] = NULL;

126

135

127

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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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free(new_plugin->argv);

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free(new_plugin);

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return NULL;

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142

}

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new_plugin->environ[0] = NULL;

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134

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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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return new_plugin;

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148

}

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149

168

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}

169

180

170

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/* Add to a plugin's environment */

171

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

182

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

172

183

if(p == NULL){

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184

return false;

174

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}

186

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

187

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){

191

/* It already exists */

192

if(replace){

193

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

194

if(new == NULL){

195

return false;

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}

197

*e = new;

198

strcpy(*e, def);

199

}

200

return true;

201

}

202

}

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

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}

177

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/*

180

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

181

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* Descriptor Flags".

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

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}

194

221

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process *process_list = NULL;

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222

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

223

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

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status. */

199

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

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

}

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if(proc == NULL){

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/* Process not found in process list */

212

return;

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}

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proc->status = status;

215

proc->completed = true;

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

}

216

253

}

217

254

255

/* Prints out a password to stdout */

218

256

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

219

257

ssize_t ret;

220

258

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

230

268

return true;

231

269

}

232

270

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;

271

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

272

static void free_plugin(plugin *plugin_node){

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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

}

239

295

}

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;

296

}

297

298

free(plugin_node);

252

299

}

253

300

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

}

301

static void free_plugin_list(void){

302

while(plugin_list != NULL){

303

free_plugin(plugin_list);

304

}

268

305

}

269

306

270

307

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

271

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

272

const char *argfile = ARGFILE;

308

char *plugindir = NULL;

309

char *argfile = NULL;

273

310

FILE *conffp;

274

311

size_t d_name_len;

275

312

DIR *dir = NULL;

298

335

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

299

336

if(ret == -1){

300

337

perror("sigaction");

301

exitstatus = EXIT_FAILURE;

338

exitstatus = EXIT_FAILURE;

302

339

goto fallback;

303

340

}

304

341

307

344

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

308

345

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

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

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

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

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.arg = "VAR=value",

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

313

350

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

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351

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

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352

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

316

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

353

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

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354

.arg = "PLUGIN:ENV=value",

318

355

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

319

356

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

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357

.arg = "PLUGIN",

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358

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

359

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

360

.arg = "PLUGIN",

361

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

322

362

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

323

363

.arg = "DIRECTORY",

324

364

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

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 },

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 },

333

376

{ .name = NULL }

334

377

};

335

378

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;

379

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

380

struct argp_state *state) {

340

381

switch (key) {

341

case 'g':

382

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

342

383

if (arg != NULL){

343

384

char *p;

344

385

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

345

386

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

346

387

continue;

347

388

}

348

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

389

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

349

390

perror("add_argument");

350

391

return ARGP_ERR_UNKNOWN;

351

392

}

352

393

}

353

394

}

354

395

break;

355

case 'e':

396

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

356

397

if(arg == NULL){

357

398

break;

358

399

}

361

402

if(envdef == NULL){

362

403

break;

363

404

}

364

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

405

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

365

406

perror("add_environment");

366

407

}

367

408

}

368

409

break;

369

case 'o':

410

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

370

411

if (arg != NULL){

371

412

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

372

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

413

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

373

414

break;

374

415

}

375

416

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

376

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

417

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

377

418

break;

378

419

}

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

}

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;

389

428

}

390

429

}

391

430

}

392

431

break;

393

case 'f':

432

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

394

433

if(arg == NULL){

395

434

break;

396

435

}

404

443

break;

405

444

}

406

445

envdef++;

407

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

446

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

408

447

perror("add_environment");

409

448

}

410

449

}

411

450

break;

412

case 'd':

451

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

413

452

if (arg != NULL){

414

plugin *p = getplugin(arg, plugins);

453

plugin *p = getplugin(arg);

415

454

if(p == NULL){

416

455

return ARGP_ERR_UNKNOWN;

417

456

}

418

457

p->disabled = true;

419

458

}

420

459

break;

421

case 128:

422

plugindir = arg;

423

break;

424

case 129:

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

479

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

426

480

break;

427

case 130:

481

case 131: /* --groupid */

428

482

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

429

483

break;

430

case 131:

484

case 132: /* --debug */

431

485

debug = true;

432

486

break;

433

487

case ARGP_KEY_ARG:

441

495

return 0;

442

496

}

443

497

444

plugin *plugin_list = NULL;

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

}

445

529

446

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

447

.args_doc = "[+PLUS_SEPARATED_OPTIONS]",

530

struct argp argp = { .options = options,

531

.parser = parse_opt_config_file,

532

.args_doc = "",

448

533

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

449

534

450

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

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);

451

538

if (ret == ARGP_ERR_UNKNOWN){

452

539

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

453

540

exitstatus = EXIT_FAILURE;

454

541

goto fallback;

455

542

}

456

457

conffp = fopen(argfile, "r");

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

}

458

553

if(conffp != NULL){

459

554

char *org_line = NULL;

460

555

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

463

558

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

464

559

const char comment_delim[] = "#";

465

560

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 */

466

573

while(true){

467

574

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

468

575

if(sret == -1){

476

583

continue;

477

584

}

478

585

new_arg = strdup(p);

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

}

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;

485

604

}

486

605

}

487

606

free(org_line);

488

} else{

607

} else {

489

608

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

490

609

not affect opening plugins */

491

610

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

494

613

goto fallback;

495

614

}

496

615

}

497

616

/* If there was any arguments from configuration file,

617

pass them to parser as command arguments */

498

618

if(custom_argv != NULL){

499

custom_argv[0] = argv[0];

500

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

619

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

620

0, NULL);

501

621

if (ret == ARGP_ERR_UNKNOWN){

502

622

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

503

623

exitstatus = EXIT_FAILURE;

505

625

}

506

626

}

507

627

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

508

637

if(debug){

509

638

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

510

639

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

519

648

}

520

649

}

521

650

651

/* Strip permissions down to nobody */

522

652

ret = setuid(uid);

523

653

if (ret == -1){

524

654

perror("setuid");

525

}

526

655

}

527

656

setgid(gid);

528

657

if (ret == -1){

529

658

perror("setgid");

530

659

}

531

660

532

dir = opendir(plugindir);

661

if (plugindir == NULL){

662

dir = opendir(PDIR);

663

} else {

664

dir = opendir(plugindir);

665

}

666

533

667

if(dir == NULL){

534

668

perror("Could not open plugin dir");

535

669

exitstatus = EXIT_FAILURE;

551

685

552

686

FD_ZERO(&rfds_all);

553

687

688

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

554

689

while(true){

555

690

dirst = readdir(dir);

556

691

557

// All directory entries have been processed

692

/* All directory entries have been processed */

558

693

if(dirst == NULL){

559

694

if (errno == EBADF){

560

695

perror("readdir");

566

701

567

702

d_name_len = strlen(dirst->d_name);

568

703

569

// Ignore dotfiles, backup files and other junk

704

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

570

705

{

571

706

bool bad_name = false;

572

707

587

722

break;

588

723

}

589

724

}

590

591

725

if(bad_name){

592

726

continue;

593

727

}

594

595

728

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

596

729

size_t suf_len = strlen(*suf);

597

730

if((d_name_len >= suf_len)

624

757

free(filename);

625

758

continue;

626

759

}

627

760

761

/* Ignore non-executable files */

628

762

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

629

763

if(debug){

630

764

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

633

767

free(filename);

634

768

continue;

635

769

}

636

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

770

771

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

637

772

if(p == NULL){

638

773

perror("getplugin");

639

774

free(filename);

649

784

}

650

785

{

651

786

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

652

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

787

plugin *g = getplugin(NULL);

653

788

if(g != NULL){

654

789

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

655

790

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

658

793

}

659

794

/* Add global environment variables */

660

795

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

661

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

796

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

662

797

perror("add_environment");

663

798

}

664

799

}

669

804

process, too. */

670

805

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

671

806

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

672

char *copy = strdup(*e);

673

if(copy == NULL){

674

perror("strdup");

675

continue;

676

}

677

if(not add_environment(p, copy)){

807

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

678

808

perror("add_environment");

679

809

}

680

810

}

681

811

}

682

812

683

int pipefd[2];

813

int pipefd[2];

684

814

ret = pipe(pipefd);

685

815

if (ret == -1){

686

816

perror("pipe");

687

817

exitstatus = EXIT_FAILURE;

688

818

goto fallback;

689

819

}

820

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

690

821

ret = set_cloexec_flag(pipefd[0]);

691

822

if(ret < 0){

692

823

perror("set_cloexec_flag");

706

837

exitstatus = EXIT_FAILURE;

707

838

goto fallback;

708

839

}

709

// Starting a new process to be watched

840

/* Starting a new process to be watched */

710

841

pid_t pid = fork();

711

842

if(pid == -1){

712

843

perror("fork");

750

881

}

751

882

/* no return */

752

883

}

753

/* parent process */

884

/* Parent process */

885

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

754

886

free(filename);

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");

887

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

888

if (new_plugin == NULL){

889

perror("getplugin");

759

890

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

760

891

if(ret < 0){

761

perror("sigprocmask");

892

perror("sigprocmask");

762

893

}

763

894

exitstatus = EXIT_FAILURE;

764

895

goto fallback;

765

896

}

766

897

767

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

768

.fd = pipefd[0],

769

.next = process_list };

770

// List handling

771

process_list = new_process;

898

new_plugin->pid = pid;

899

new_plugin->fd = pipefd[0];

900

772

901

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

773

902

has already completed */

774

903

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

778

907

goto fallback;

779

908

}

780

909

781

FD_SET(new_process->fd, &rfds_all);

910

FD_SET(new_plugin->fd, &rfds_all);

782

911

783

if (maxfd < new_process->fd){

784

maxfd = new_process->fd;

912

if (maxfd < new_plugin->fd){

913

maxfd = new_plugin->fd;

785

914

}

786

915

787

916

}

788

917

789

free_plugin_list(plugin_list);

790

791

918

closedir(dir);

792

919

dir = NULL;

793

794

if (process_list == NULL){

795

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

796

" directory?\n");

797

process_list = 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

930

}

799

while(process_list){

931

932

/* Main loop while running plugins exist */

933

while(plugin_list){

800

934

fd_set rfds = rfds_all;

801

935

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

802

936

if (select_ret == -1){

806

940

}

807

941

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

808

942

from one of them */

809

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

943

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

810

944

/* Is this process completely done? */

811

945

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

812

946

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

813

947

if(not WIFEXITED(proc->status)

814

948

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

815

949

/* Bad exit by plugin */

950

816

951

if(debug){

817

952

if(WIFEXITED(proc->status)){

818

953

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

827

962

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

828

963

}

829

964

}

965

830

966

/* Remove the plugin */

831

967

FD_CLR(proc->fd, &rfds_all);

968

832

969

/* Block signal while modifying process_list */

833

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

970

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

834

971

if(ret < 0){

835

972

perror("sigprocmask");

836

973

exitstatus = EXIT_FAILURE;

837

974

goto fallback;

838

975

}

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

}

976

free_plugin(proc);

852

977

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

853

978

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,

854

979

NULL);

855

980

if(ret < 0){

856

981

perror("sigprocmask");

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;

982

exitstatus = EXIT_FAILURE;

983

goto fallback;

984

}

985

986

if(plugin_list == NULL){

987

break;

988

}

989

continue;

864

990

}

991

865

992

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

866

993

867

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

994

bool bret = print_out_password(proc->buffer,

995

proc->buffer_length);

868

996

if(not bret){

869

997

perror("print_out_password");

870

998

exitstatus = EXIT_FAILURE;

871

999

}

872

1000

goto fallback;

873

1001

}

1002

874

1003

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

875

1004

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

876

1005

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

906

1035

907

1036

fallback:

908

1037

909

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

910

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

1038

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

1039

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

1040

occured */

911

1041

bool bret;

912

1042

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

913

1043

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

926

1056

}

927

1057

928

1058

if(custom_argv != NULL){

929

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

1059

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

930

1060

free(*arg);

931

1061

}

932

1062

free(custom_argv);

933

1063

}

934

free_plugin_list(plugin_list);

935

1064

936

1065

if(dir != NULL){

937

1066

closedir(dir);

938

1067

}

939

1068

940

1069

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

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");

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

}

948

1078

}

949

free(process_list->buffer);

950

free(process_list);

951

1079

}

952

1080

953

1081

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

957

1085

if(errno != ECHILD){

958

1086

perror("wait");

959

1087

}

1088

1089

free_plugin_list();

1090

1091

free(plugindir);

1092

free(argfile);

960

1093

961

1094

return exitstatus;

962

1095

}