/mandos/trunk : revision 183

65

#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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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 **argv;

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int argc;

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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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91

bool eof;

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volatile bool completed;

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volatile int status;

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struct process *next;

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} process;

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typedef struct plugin{

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

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char **argv;

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int argc;

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char **environ;

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int envc;

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bool disabled;

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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 */

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

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.argc = 1,

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.envc = 0,

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.disabled = false,

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.next = *plugin_list };

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.next = plugin_list };

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

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128

if (new_plugin->argv == NULL){

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132

}

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new_plugin->argv[0] = copy_name;

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new_plugin->argv[1] = NULL;

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132

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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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return NULL;

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}

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new_plugin->environ[0] = NULL;

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/* Append the new plugin to the list */

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*plugin_list = new_plugin;

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plugin_list = new_plugin;

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return new_plugin;

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148

}

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149

174

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}

175

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/* Add to a plugin's environment */

177

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

182

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

178

183

if(p == NULL){

179

184

return false;

180

185

}

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 */

189

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

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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;

196

}

197

*e = new;

198

strcpy(*e, def);

199

}

200

return true;

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}

202

}

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

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}

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185

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/*

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

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* Descriptor Flags".

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

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}

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process *process_list = NULL;

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

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status. */

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

206

226

while(true){

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process *proc = process_list;

227

plugin *proc = plugin_list;

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228

int status;

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

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if(pid == 0){

218

238

/* No child processes */

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239

break;

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}

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

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

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proc = proc->next;

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}

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}

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/* Prints out a password to stdout */

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

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257

ssize_t ret;

237

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

238

length--;

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}

240

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

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

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260

length - written));

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return true;

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}

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

251

if (argv == NULL){

252

*argc = 1;

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

254

if(argv == NULL){

255

return NULL;

268

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

269

static void free_plugin(plugin *plugin_node){

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

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free(*arg);

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}

274

free(plugin_node->argv);

275

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

276

free(*env);

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}

278

free(plugin_node->environ);

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free(plugin_node->buffer);

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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;

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break;

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}

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292

}

257

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

258

parsing */

259

argv[1] = NULL;

260

}

261

*argc += 1;

262

argv = realloc(argv, sizeof(char *)

263

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

264

if(argv == NULL){

265

return NULL;

266

}

267

argv[*argc-1] = arg;

268

argv[*argc] = NULL;

269

return argv;

293

}

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free(plugin_node);

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}

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297

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static void free_plugin_list(plugin *plugin_list){

273

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

274

next = plugin_list->next;

275

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

276

free(*arg);

277

}

278

free(plugin_list->argv);

279

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

280

free(*env);

281

}

282

free(plugin_list->environ);

283

free(plugin_list);

298

static void free_plugin_list(void){

299

while(plugin_list != NULL){

300

free_plugin(plugin_list);

284

301

}

285

302

}

286

303

287

304

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

288

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

289

const char *argfile = ARGFILE;

305

char *plugindir = NULL;

306

char *argfile = NULL;

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FILE *conffp;

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size_t d_name_len;

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DIR *dir = NULL;

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341

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

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

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

327

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

344

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

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.arg = "VAR=value",

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

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

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

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

333

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

350

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

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351

.arg = "PLUGIN:ENV=value",

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

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353

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

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354

.arg = "PLUGIN",

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355

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

356

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

357

.arg = "PLUGIN",

358

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

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

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.arg = "DIRECTORY",

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361

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

342

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

343

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

344

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

345

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

346

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

347

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

348

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

349

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

362

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

363

.arg = "FILE",

364

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

365

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

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

367

.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 },

371

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

372

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

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373

{ .name = NULL }

351

374

};

352

375

353

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

354

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

355

pointer to our plugin list pointer. */

356

plugin **plugins = state->input;

376

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

377

struct argp_state *state) {

357

378

switch (key) {

358

case 'g':

379

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

359

380

if (arg != NULL){

360

381

char *p;

361

382

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

362

383

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

363

384

continue;

364

385

}

365

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

386

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

366

387

perror("add_argument");

367

388

return ARGP_ERR_UNKNOWN;

368

389

}

369

390

}

370

391

}

371

392

break;

372

case 'e':

393

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

373

394

if(arg == NULL){

374

395

break;

375

396

}

376

{

377

char *envdef = strdup(arg);

378

if(envdef == NULL){

379

break;

380

}

381

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

382

perror("add_environment");

383

}

397

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

398

perror("add_environment");

384

399

}

385

400

break;

386

case 'o':

401

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

387

402

if (arg != NULL){

388

403

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

389

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

404

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

390

405

break;

391

406

}

392

407

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

393

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

408

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

394

409

break;

395

410

}

396

if(opt != NULL){

397

char *p;

398

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

399

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

400

continue;

401

}

402

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

403

perror("add_argument");

404

return ARGP_ERR_UNKNOWN;

405

}

411

char *p;

412

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

413

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

414

continue;

415

}

416

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

417

perror("add_argument");

418

return ARGP_ERR_UNKNOWN;

406

419

}

407

420

}

408

421

}

409

422

break;

410

case 'f':

423

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

411

424

if(arg == NULL){

412

425

break;

413

426

}

416

429

if(envdef == NULL){

417

430

break;

418

431

}

419

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

420

if(p_name == NULL){

421

break;

422

}

423

envdef++;

424

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

432

*envdef = '\0';

433

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

425

434

perror("add_environment");

426

435

}

427

436

}

428

437

break;

429

case 'd':

438

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

430

439

if (arg != NULL){

431

plugin *p = getplugin(arg, plugins);

440

plugin *p = getplugin(arg);

432

441

if(p == NULL){

433

442

return ARGP_ERR_UNKNOWN;

434

443

}

435

444

p->disabled = true;

436

445

}

437

446

break;

438

case 128:

439

plugindir = arg;

440

break;

441

case 129:

447

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

448

if (arg != NULL){

449

plugin *p = getplugin(arg);

450

if(p == NULL){

451

return ARGP_ERR_UNKNOWN;

452

}

453

p->disabled = false;

454

}

455

break;

456

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

457

free(plugindir);

458

plugindir = strdup(arg);

459

if(plugindir == NULL){

460

perror("strdup");

461

}

462

break;

463

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

464

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

465

break;

466

case 130: /* --userid */

442

467

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

443

468

break;

444

case 130:

469

case 131: /* --groupid */

445

470

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

446

471

break;

447

case 131:

472

case 132: /* --debug */

448

473

debug = true;

449

474

break;

450

475

case ARGP_KEY_ARG:

451

fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);

452

break;

453

case ARGP_KEY_END:

454

break;

455

default:

456

return ARGP_ERR_UNKNOWN;

457

}

458

return 0;

459

}

460

461

plugin *plugin_list = NULL;

462

463

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

464

.args_doc = "[+PLUS_SEPARATED_OPTIONS]",

476

/* Cryptsetup always passes an argument, which is an empty

477

string if "none" was specified in /etc/crypttab. So if

478

argument was empty, we ignore it silently. */

479

if(arg[0] != '\0'){

480

fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);

481

}

482

break;

483

case ARGP_KEY_END:

484

break;

485

default:

486

return ARGP_ERR_UNKNOWN;

487

}

488

return 0;

489

}

490

491

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

492

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

493

error_t parse_opt_config_file (int key, char *arg,

494

__attribute__((unused))

495

struct argp_state *state) {

496

switch (key) {

497

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

498

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

499

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

500

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

501

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

502

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

503

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

504

break;

505

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

506

free(argfile);

507

argfile = strdup(arg);

508

if(argfile == NULL){

509

perror("strdup");

510

}

511

break;

512

case 130: /* --userid */

513

case 131: /* --groupid */

514

case 132: /* --debug */

515

case ARGP_KEY_ARG:

516

case ARGP_KEY_END:

517

break;

518

default:

519

return ARGP_ERR_UNKNOWN;

520

}

521

return 0;

522

}

523

524

struct argp argp = { .options = options,

525

.parser = parse_opt_config_file,

526

.args_doc = "",

465

527

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

466

528

467

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

529

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

530

config file location, if any. */

531

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

468

532

if (ret == ARGP_ERR_UNKNOWN){

469

533

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

470

534

exitstatus = EXIT_FAILURE;

471

535

goto fallback;

472

536

}

473

474

conffp = fopen(argfile, "r");

537

538

/* Reset to the normal argument parser */

539

argp.parser = parse_opt;

540

541

/* Open the configfile if available */

542

if (argfile == NULL){

543

conffp = fopen(AFILE, "r");

544

} else {

545

conffp = fopen(argfile, "r");

546

}

475

547

if(conffp != NULL){

476

548

char *org_line = NULL;

477

549

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

480

552

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

481

553

const char comment_delim[] = "#";

482

554

555

custom_argc = 1;

556

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

557

if(custom_argv == NULL){

558

perror("malloc");

559

exitstatus = EXIT_FAILURE;

560

goto fallback;

561

}

562

custom_argv[0] = argv[0];

563

custom_argv[1] = NULL;

564

565

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

566

commented text */

483

567

while(true){

484

568

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

485

569

if(sret == -1){

493

577

continue;

494

578

}

495

579

new_arg = strdup(p);

496

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

497

if (custom_argv == NULL){

498

perror("add_to_argv");

499

exitstatus = EXIT_FAILURE;

500

goto fallback;

501

}

580

if(new_arg == NULL){

581

perror("strdup");

582

exitstatus = EXIT_FAILURE;

583

free(org_line);

584

goto fallback;

585

}

586

587

custom_argc += 1;

588

custom_argv = realloc(custom_argv, sizeof(char *)

589

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

590

if(custom_argv == NULL){

591

perror("realloc");

592

exitstatus = EXIT_FAILURE;

593

free(org_line);

594

goto fallback;

595

}

596

custom_argv[custom_argc-1] = new_arg;

597

custom_argv[custom_argc] = NULL;

502

598

}

503

599

}

504

600

free(org_line);

505

} else{

601

} else {

506

602

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

507

603

not affect opening plugins */

508

604

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

511

607

goto fallback;

512

608

}

513

609

}

514

610

/* If there was any arguments from configuration file,

611

pass them to parser as command arguments */

515

612

if(custom_argv != NULL){

516

custom_argv[0] = argv[0];

517

ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0,

518

&plugin_list);

613

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

614

0, NULL);

519

615

if (ret == ARGP_ERR_UNKNOWN){

520

616

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

521

617

exitstatus = EXIT_FAILURE;

523

619

}

524

620

}

525

621

622

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

623

config file */

624

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

625

if (ret == ARGP_ERR_UNKNOWN){

626

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

627

exitstatus = EXIT_FAILURE;

628

goto fallback;

629

}

630

526

631

if(debug){

527

632

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

528

633

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

537

642

}

538

643

}

539

644

645

/* Strip permissions down to nobody */

540

646

ret = setuid(uid);

541

647

if (ret == -1){

542

648

perror("setuid");

543

}

544

649

}

545

650

setgid(gid);

546

651

if (ret == -1){

547

652

perror("setgid");

548

653

}

549

654

550

dir = opendir(plugindir);

655

if (plugindir == NULL){

656

dir = opendir(PDIR);

657

} else {

658

dir = opendir(plugindir);

659

}

660

551

661

if(dir == NULL){

552

662

perror("Could not open plugin dir");

553

663

exitstatus = EXIT_FAILURE;

569

679

570

680

FD_ZERO(&rfds_all);

571

681

682

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

572

683

while(true){

573

684

dirst = readdir(dir);

574

685

575

// All directory entries have been processed

686

/* All directory entries have been processed */

576

687

if(dirst == NULL){

577

688

if (errno == EBADF){

578

689

perror("readdir");

584

695

585

696

d_name_len = strlen(dirst->d_name);

586

697

587

// Ignore dotfiles, backup files and other junk

698

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

588

699

{

589

700

bool bad_name = false;

590

701

605

716

break;

606

717

}

607

718

}

608

609

719

if(bad_name){

610

720

continue;

611

721

}

612

613

722

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

614

723

size_t suf_len = strlen(*suf);

615

724

if((d_name_len >= suf_len)

630

739

}

631

740

632

741

char *filename;

633

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

742

if(plugindir == NULL){

743

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

744

} else {

745

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

746

}

634

747

if(ret < 0){

635

748

perror("asprintf");

636

749

continue;

642

755

free(filename);

643

756

continue;

644

757

}

645

758

759

/* Ignore non-executable files */

646

760

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

647

761

if(debug){

648

762

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

651

765

free(filename);

652

766

continue;

653

767

}

654

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

768

769

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

655

770

if(p == NULL){

656

771

perror("getplugin");

657

772

free(filename);

667

782

}

668

783

{

669

784

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

670

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

785

plugin *g = getplugin(NULL);

671

786

if(g != NULL){

672

787

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

673

788

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

676

791

}

677

792

/* Add global environment variables */

678

793

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

679

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

794

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

680

795

perror("add_environment");

681

796

}

682

797

}

687

802

process, too. */

688

803

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

689

804

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

690

char *copy = strdup(*e);

691

if(copy == NULL){

692

perror("strdup");

693

continue;

694

}

695

if(not add_environment(p, copy)){

805

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

696

806

perror("add_environment");

697

807

}

698

808

}

705

815

exitstatus = EXIT_FAILURE;

706

816

goto fallback;

707

817

}

818

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

708

819

ret = set_cloexec_flag(pipefd[0]);

709

820

if(ret < 0){

710

821

perror("set_cloexec_flag");

724

835

exitstatus = EXIT_FAILURE;

725

836

goto fallback;

726

837

}

727

// Starting a new process to be watched

838

/* Starting a new process to be watched */

728

839

pid_t pid = fork();

729

840

if(pid == -1){

730

841

perror("fork");

768

879

}

769

880

/* no return */

770

881

}

771

/* parent process */

882

/* Parent process */

883

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

772

884

free(filename);

773

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

774

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

775

if (new_process == NULL){

776

perror("malloc");

885

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

886

if (new_plugin == NULL){

887

perror("getplugin");

777

888

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

778

889

if(ret < 0){

779

perror("sigprocmask");

890

perror("sigprocmask");

780

891

}

781

892

exitstatus = EXIT_FAILURE;

782

893

goto fallback;

783

894

}

784

895

785

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

786

.fd = pipefd[0],

787

.next = process_list };

788

// List handling

789

process_list = new_process;

896

new_plugin->pid = pid;

897

new_plugin->fd = pipefd[0];

898

790

899

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

791

900

has already completed */

792

901

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

796

905

goto fallback;

797

906

}

798

907

799

FD_SET(new_process->fd, &rfds_all);

908

FD_SET(new_plugin->fd, &rfds_all);

800

909

801

if (maxfd < new_process->fd){

802

maxfd = new_process->fd;

910

if (maxfd < new_plugin->fd){

911

maxfd = new_plugin->fd;

803

912

}

804

913

805

914

}

806

915

807

free_plugin_list(plugin_list);

808

plugin_list = NULL;

809

810

916

closedir(dir);

811

917

dir = NULL;

812

813

if (process_list == NULL){

814

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

815

" directory?\n");

816

process_list = NULL;

918

919

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

920

if(p->pid != 0){

921

break;

922

}

923

if(p->next == NULL){

924

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

925

" directory?\n");

926

free_plugin_list();

927

}

817

928

}

818

while(process_list){

929

930

/* Main loop while running plugins exist */

931

while(plugin_list){

819

932

fd_set rfds = rfds_all;

820

933

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

821

934

if (select_ret == -1){

825

938

}

826

939

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

827

940

from one of them */

828

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

941

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

829

942

/* Is this process completely done? */

830

943

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

831

944

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

832

945

if(not WIFEXITED(proc->status)

833

946

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

834

947

/* Bad exit by plugin */

948

835

949

if(debug){

836

950

if(WIFEXITED(proc->status)){

837

951

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

846

960

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

847

961

}

848

962

}

963

849

964

/* Remove the plugin */

850

965

FD_CLR(proc->fd, &rfds_all);

966

851

967

/* Block signal while modifying process_list */

852

968

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

853

969

if(ret < 0){

855

971

exitstatus = EXIT_FAILURE;

856

972

goto fallback;

857

973

}

858

/* Delete this process entry from the list */

859

if(process_list == proc){

860

/* First one - simple */

861

process_list = proc->next;

862

} else {

863

/* Second one or later */

864

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

865

if(p->next == proc){

866

p->next = proc->next;

867

break;

868

}

869

}

870

}

974

871

975

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

872

976

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,

873

977

NULL);

874

978

if(ret < 0){

875

979

perror("sigprocmask");

876

}

877

free(proc->buffer);

878

free(proc);

879

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

880

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

881

the process list */

882

break;

980

exitstatus = EXIT_FAILURE;

981

goto fallback;

982

}

983

984

if(plugin_list == NULL){

985

break;

986

}

987

988

plugin *next_plugin = proc->next;

989

free_plugin(proc);

990

proc = next_plugin;

991

continue;

883

992

}

993

884

994

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

885

995

886

996

bool bret = print_out_password(proc->buffer,

891

1001

}

892

1002

goto fallback;

893

1003

}

1004

894

1005

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

895

1006

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

896

1007

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

1008

proc = proc->next;

897

1009

continue;

898

1010

}

899

1011

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

912

1024

BUFFER_SIZE);

913

1025

if(ret < 0){

914

1026

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

1027

proc = proc->next;

915

1028

continue;

916

1029

}

917

1030

if(ret == 0){

926

1039

927

1040

fallback:

928

1041

929

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

1042

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

930

1043

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

931

1044

occured */

932

1045

bool bret;

933

1046

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

934

1047

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

935

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

1048

size_t len = strlen(passwordbuffer);

1049

/* Strip trailing newline */

1050

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

1051

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

1052

len--;

1053

}

1054

bret = print_out_password(passwordbuffer, len);

936

1055

if(not bret){

937

1056

perror("print_out_password");

938

1057

exitstatus = EXIT_FAILURE;

947

1066

}

948

1067

949

1068

if(custom_argv != NULL){

950

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

1069

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

951

1070

free(*arg);

952

1071

}

953

1072

free(custom_argv);

954

1073

}

955

free_plugin_list(plugin_list);

956

1074

957

1075

if(dir != NULL){

958

1076

closedir(dir);

959

1077

}

960

1078

961

1079

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

962

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

963

next = process_list->next;

964

close(process_list->fd);

965

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

966

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

967

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

968

perror("kill");

1080

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

1081

if(p->pid != 0){

1082

close(p->fd);

1083

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

1084

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

1085

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

1086

perror("kill");

1087

}

969

1088

}

970

free(process_list->buffer);

971

free(process_list);

972

1089

}

973

1090

974

1091

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

978

1095

if(errno != ECHILD){

979

1096

perror("wait");

980

1097

}

1098

1099

free_plugin_list();

1100

1101

free(plugindir);

1102

free(argfile);

981

1103

982

1104

return exitstatus;

983

1105

}