/mandos/trunk : revision 24.1.66

65

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

66

67

#define BUFFER_SIZE 256

68

69

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

70

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

68

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

71

69

72

70

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

73

71

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

74

72

75

struct plugin;

76

77

typedef struct plugin{

78

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

79

char **argv;

80

int argc;

81

char **environ;

82

int envc;

83

bool disabled;

84

85

/* Variables used for running processes*/

73

struct process;

74

75

typedef struct process{

86

76

pid_t pid;

87

77

int fd;

88

78

char *buffer;

91

81

bool eof;

92

82

volatile bool completed;

93

83

volatile int status;

84

struct process *next;

85

} process;

86

87

typedef struct plugin{

88

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

89

char **argv;

90

int argc;

91

char **environ;

92

int envc;

93

bool disabled;

94

struct plugin *next;

95

} plugin;

96

97

static plugin *plugin_list = NULL;

98

99

/* Gets an existing plugin based on name,

100

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

101

static plugin *getplugin(char *name){

102

/* Check for exiting plugin with that name */

103

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

97

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

98

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

104

99

if ((p->name == name)

105

100

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

106

101

return p;

121

116

122

117

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

123

118

.argc = 1,

119

.envc = 0,

124

120

.disabled = false,

125

.next = plugin_list };

121

.next = *plugin_list };

126

122

127

123

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

128

124

if (new_plugin->argv == NULL){

132

128

}

133

129

new_plugin->argv[0] = copy_name;

134

130

new_plugin->argv[1] = NULL;

135

131

136

132

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

137

133

if(new_plugin->environ == NULL){

138

134

free(copy_name);

141

137

return NULL;

142

138

}

143

139

new_plugin->environ[0] = NULL;

144

145

140

/* Append the new plugin to the list */

146

plugin_list = new_plugin;

141

*plugin_list = new_plugin;

147

142

return new_plugin;

148

143

}

149

144

179

174

}

180

175

181

176

/* Add to a plugin's environment */

182

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

177

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

183

178

if(p == NULL){

184

179

return false;

185

180

}

186

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

187

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

188

/* Search for this environment variable */

189

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;

196

}

197

*e = new;

198

strcpy(*e, def);

199

}

200

return true;

201

}

202

}

203

181

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

204

182

}

205

183

184

206

185

/*

207

186

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

208

187

* Descriptor Flags".

219

198

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

220

199

}

221

200

201

process *process_list = NULL;

222

202

223

203

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

224

204

status. */

225

205

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

226

206

while(true){

227

plugin *proc = plugin_list;

207

process *proc = process_list;

228

208

int status;

229

209

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

230

210

if(pid == 0){

238

218

/* No child processes */

239

219

break;

240

220

}

241

221

242

222

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

243

223

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

244

224

proc = proc->next;

252

232

}

253

233

}

254

234

255

/* Prints out a password to stdout */

256

235

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

257

236

ssize_t ret;

237

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

238

length--;

239

}

258

240

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

259

241

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

260

242

length - written));

265

247

return true;

266

248

}

267

249

268

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

269

static void free_plugin(plugin *plugin_node){

270

271

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

272

free(*arg);

273

}

274

free(plugin_node->argv);

275

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

276

free(*env);

277

}

278

free(plugin_node->environ);

279

free(plugin_node->buffer);

280

281

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

282

if(plugin_node == plugin_list){

283

/* First one - simple */

284

plugin_list = plugin_list->next;

285

} else {

286

/* Second one or later */

287

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

288

if(p->next == plugin_node){

289

p->next = plugin_node->next;

290

break;

291

}

250

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

251

if (argv == NULL){

252

*argc = 1;

253

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

254

if(argv == NULL){

255

return NULL;

292

256

}

293

}

294

295

free(plugin_node);

257

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

258

argv[1] = NULL;

259

}

260

*argc += 1;

261

argv = realloc(argv, sizeof(char *)

262

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

263

if(argv == NULL){

264

return NULL;

265

}

266

argv[*argc-1] = arg;

267

argv[*argc] = NULL;

268

return argv;

296

269

}

297

270

298

static void free_plugin_list(void){

299

while(plugin_list != NULL){

300

free_plugin(plugin_list);

271

static void free_plugin_list(plugin *plugin_list){

272

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

273

next = plugin_list->next;

274

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

275

free(*arg);

276

}

277

free(plugin_list->argv);

278

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

279

free(*env);

280

}

281

free(plugin_list->environ);

282

free(plugin_list);

301

283

}

302

284

}

303

285

304

286

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

305

char *plugindir = NULL;

306

char *argfile = NULL;

287

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

288

const char *argfile = ARGFILE;

307

289

FILE *conffp;

308

290

size_t d_name_len;

309

291

DIR *dir = NULL;

341

323

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

342

324

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

343

325

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

344

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

326

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

345

327

.arg = "VAR=value",

346

328

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

347

329

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

348

330

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

349

331

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

350

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

332

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

351

333

.arg = "PLUGIN:ENV=value",

352

334

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

353

335

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

354

336

.arg = "PLUGIN",

355

337

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

356

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

357

.arg = "PLUGIN",

358

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

359

338

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

360

339

.arg = "DIRECTORY",

361

340

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

362

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

363

.arg = "FILE",

364

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

365

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

366

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

367

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

368

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

369

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

370

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

371

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

372

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

341

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

342

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

343

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

344

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

345

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

346

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

347

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

348

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

373

349

{ .name = NULL }

374

350

};

375

351

376

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

377

struct argp_state *state) {

352

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

353

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

354

pointer to our plugin list pointer. */

355

plugin **plugins = state->input;

378

356

switch (key) {

379

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

357

case 'g':

380

358

if (arg != NULL){

381

359

char *p;

382

360

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

383

361

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

384

362

continue;

385

363

}

386

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

364

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

387

365

perror("add_argument");

388

366

return ARGP_ERR_UNKNOWN;

389

367

}

390

368

}

391

369

}

392

370

break;

393

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

371

case 'e':

394

372

if(arg == NULL){

395

373

break;

396

374

}

397

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

398

perror("add_environment");

375

{

376

char *envdef = strdup(arg);

377

if(envdef == NULL){

378

break;

379

}

380

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

381

perror("add_environment");

382

}

399

383

}

400

384

break;

401

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

385

case 'o':

402

386

if (arg != NULL){

403

387

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

404

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

388

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

405

389

break;

406

390

}

407

391

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

408

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

392

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

409

393

break;

410

394

}

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;

395

if(opt != NULL){

396

char *p;

397

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

398

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

399

continue;

400

}

401

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

402

perror("add_argument");

403

return ARGP_ERR_UNKNOWN;

404

}

419

405

}

420

406

}

421

407

}

422

408

break;

423

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

409

case 'f':

424

410

if(arg == NULL){

425

411

break;

426

412

}

429

415

if(envdef == NULL){

430

416

break;

431

417

}

432

*envdef = '\0';

433

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

418

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

419

if(p_name == NULL){

420

break;

421

}

422

envdef++;

423

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

434

424

perror("add_environment");

435

425

}

436

426

}

437

427

break;

438

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

428

case 'd':

439

429

if (arg != NULL){

440

plugin *p = getplugin(arg);

430

plugin *p = getplugin(arg, plugins);

441

431

if(p == NULL){

442

432

return ARGP_ERR_UNKNOWN;

443

433

}

444

434

p->disabled = true;

445

435

}

446

436

break;

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 */

437

case 128:

438

plugindir = arg;

439

break;

440

case 129:

467

441

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

468

442

break;

469

case 131: /* --groupid */

443

case 130:

470

444

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

471

445

break;

472

case 132: /* --debug */

446

case 131:

473

447

debug = true;

474

448

break;

475

449

case ARGP_KEY_ARG:

483

457

return 0;

484

458

}

485

459

486

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

487

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

488

error_t parse_opt_config_file (int key, char *arg,

489

__attribute__((unused))

490

struct argp_state *state) {

491

switch (key) {

492

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

493

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

494

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

495

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

496

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

497

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

498

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

499

break;

500

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

501

free(argfile);

502

argfile = strdup(arg);

503

if(argfile == NULL){

504

perror("strdup");

505

}

506

break;

507

case 130: /* --userid */

508

case 131: /* --groupid */

509

case 132: /* --debug */

510

case ARGP_KEY_ARG:

511

case ARGP_KEY_END:

512

break;

513

default:

514

return ARGP_ERR_UNKNOWN;

515

}

516

return 0;

517

}

460

plugin *plugin_list = NULL;

518

461

519

struct argp argp = { .options = options,

520

.parser = parse_opt_config_file,

521

.args_doc = "",

462

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

463

.args_doc = "[+PLUS_SEPARATED_OPTIONS]",

522

464

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

523

465

524

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

525

config file location, if any. */

526

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

466

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

527

467

if (ret == ARGP_ERR_UNKNOWN){

528

468

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

529

469

exitstatus = EXIT_FAILURE;

530

470

goto fallback;

531

471

}

532

533

/* Reset to the normal argument parser */

534

argp.parser = parse_opt;

535

536

/* Open the configfile if available */

537

if (argfile == NULL){

538

conffp = fopen(AFILE, "r");

539

} else {

540

conffp = fopen(argfile, "r");

541

}

472

473

conffp = fopen(argfile, "r");

542

474

if(conffp != NULL){

543

475

char *org_line = NULL;

544

476

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

547

479

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

548

480

const char comment_delim[] = "#";

549

481

550

custom_argc = 1;

551

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

552

if(custom_argv == NULL){

553

perror("malloc");

554

exitstatus = EXIT_FAILURE;

555

goto fallback;

556

}

557

custom_argv[0] = argv[0];

558

custom_argv[1] = NULL;

559

560

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

561

commented text */

562

482

while(true){

563

483

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

564

484

if(sret == -1){

572

492

continue;

573

493

}

574

494

new_arg = strdup(p);

575

if(new_arg == NULL){

576

perror("strdup");

577

exitstatus = EXIT_FAILURE;

578

free(org_line);

579

goto fallback;

580

}

581

582

custom_argc += 1;

583

custom_argv = realloc(custom_argv, sizeof(char *)

584

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

585

if(custom_argv == NULL){

586

perror("realloc");

587

exitstatus = EXIT_FAILURE;

588

free(org_line);

589

goto fallback;

590

}

591

custom_argv[custom_argc-1] = new_arg;

592

custom_argv[custom_argc] = NULL;

495

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

496

if (custom_argv == NULL){

497

perror("add_to_argv");

498

exitstatus = EXIT_FAILURE;

499

goto fallback;

500

}

593

501

}

594

502

}

595

503

free(org_line);

596

} else {

504

} else{

597

505

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

598

506

not affect opening plugins */

599

507

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

602

510

goto fallback;

603

511

}

604

512

}

605

/* If there was any arguments from configuration file,

606

pass them to parser as command arguments */

513

607

514

if(custom_argv != NULL){

608

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

609

0, NULL);

515

custom_argv[0] = argv[0];

516

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

610

517

if (ret == ARGP_ERR_UNKNOWN){

611

518

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

612

519

exitstatus = EXIT_FAILURE;

614

521

}

615

522

}

616

523

617

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

618

config file */

619

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

620

if (ret == ARGP_ERR_UNKNOWN){

621

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

622

exitstatus = EXIT_FAILURE;

623

goto fallback;

624

}

625

626

524

if(debug){

627

525

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

628

526

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

637

535

}

638

536

}

639

537

640

/* Strip permissions down to nobody */

641

538

ret = setuid(uid);

642

539

if (ret == -1){

643

540

perror("setuid");

644

}

541

}

542

645

543

setgid(gid);

646

544

if (ret == -1){

647

545

perror("setgid");

648

546

}

649

547

650

if (plugindir == NULL){

651

dir = opendir(PDIR);

652

} else {

653

dir = opendir(plugindir);

654

}

655

548

dir = opendir(plugindir);

656

549

if(dir == NULL){

657

550

perror("Could not open plugin dir");

658

551

exitstatus = EXIT_FAILURE;

674

567

675

568

FD_ZERO(&rfds_all);

676

569

677

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

678

570

while(true){

679

571

dirst = readdir(dir);

680

572

681

/* All directory entries have been processed */

573

// All directory entries have been processed

682

574

if(dirst == NULL){

683

575

if (errno == EBADF){

684

576

perror("readdir");

690

582

691

583

d_name_len = strlen(dirst->d_name);

692

584

693

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

585

// Ignore dotfiles, backup files and other junk

694

586

{

695

587

bool bad_name = false;

696

588

711

603

break;

712

604

}

713

605

}

606

714

607

if(bad_name){

715

608

continue;

716

609

}

610

717

611

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

718

612

size_t suf_len = strlen(*suf);

719

613

if((d_name_len >= suf_len)

734

628

}

735

629

736

630

char *filename;

737

if(plugindir == NULL){

738

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

739

} else {

740

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

741

}

631

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

742

632

if(ret < 0){

743

633

perror("asprintf");

744

634

continue;

750

640

free(filename);

751

641

continue;

752

642

}

753

754

/* Ignore non-executable files */

643

755

644

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

756

645

if(debug){

757

646

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

760

649

free(filename);

761

650

continue;

762

651

}

763

764

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

652

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

765

653

if(p == NULL){

766

654

perror("getplugin");

767

655

free(filename);

777

665

}

778

666

{

779

667

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

780

plugin *g = getplugin(NULL);

668

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

781

669

if(g != NULL){

782

670

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

783

671

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

786

674

}

787

675

/* Add global environment variables */

788

676

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

789

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

677

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

790

678

perror("add_environment");

791

679

}

792

680

}

797

685

process, too. */

798

686

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

799

687

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

800

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

688

char *copy = strdup(*e);

689

if(copy == NULL){

690

perror("strdup");

691

continue;

692

}

693

if(not add_environment(p, copy)){

801

694

perror("add_environment");

802

695

}

803

696

}

810

703

exitstatus = EXIT_FAILURE;

811

704

goto fallback;

812

705

}

813

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

814

706

ret = set_cloexec_flag(pipefd[0]);

815

707

if(ret < 0){

816

708

perror("set_cloexec_flag");

830

722

exitstatus = EXIT_FAILURE;

831

723

goto fallback;

832

724

}

833

/* Starting a new process to be watched */

725

// Starting a new process to be watched

834

726

pid_t pid = fork();

835

727

if(pid == -1){

836

728

perror("fork");

874

766

}

875

767

/* no return */

876

768

}

877

/* Parent process */

878

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

769

/* parent process */

879

770

free(filename);

880

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

881

if (new_plugin == NULL){

882

perror("getplugin");

771

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

772

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

773

if (new_process == NULL){

774

perror("malloc");

883

775

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

884

776

if(ret < 0){

885

perror("sigprocmask");

777

perror("sigprocmask");

886

778

}

887

779

exitstatus = EXIT_FAILURE;

888

780

goto fallback;

889

781

}

890

782

891

new_plugin->pid = pid;

892

new_plugin->fd = pipefd[0];

893

783

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

784

.fd = pipefd[0],

785

.next = process_list };

786

// List handling

787

process_list = new_process;

894

788

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

895

789

has already completed */

896

790

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

900

794

goto fallback;

901

795

}

902

796

903

FD_SET(new_plugin->fd, &rfds_all);

797

FD_SET(new_process->fd, &rfds_all);

904

798

905

if (maxfd < new_plugin->fd){

906

maxfd = new_plugin->fd;

799

if (maxfd < new_process->fd){

800

maxfd = new_process->fd;

907

801

}

908

802

909

803

}

910

804

805

free_plugin_list(plugin_list);

806

plugin_list = NULL;

807

911

808

closedir(dir);

912

809

dir = NULL;

913

914

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

915

if(p->pid != 0){

916

break;

917

}

918

if(p->next == NULL){

919

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

920

" directory?\n");

921

free_plugin_list();

922

}

810

811

if (process_list == NULL){

812

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

813

" directory?\n");

814

process_list = NULL;

923

815

}

924

925

/* Main loop while running plugins exist */

926

while(plugin_list){

816

while(process_list){

927

817

fd_set rfds = rfds_all;

928

818

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

929

819

if (select_ret == -1){

933

823

}

934

824

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

935

825

from one of them */

936

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

826

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

937

827

/* Is this process completely done? */

938

828

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

939

829

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

940

830

if(not WIFEXITED(proc->status)

941

831

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

942

832

/* Bad exit by plugin */

943

944

833

if(debug){

945

834

if(WIFEXITED(proc->status)){

946

835

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

955

844

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

956

845

}

957

846

}

958

959

847

/* Remove the plugin */

960

848

FD_CLR(proc->fd, &rfds_all);

961

962

849

/* Block signal while modifying process_list */

963

850

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

964

851

if(ret < 0){

966

853

exitstatus = EXIT_FAILURE;

967

854

goto fallback;

968

855

}

969

856

/* Delete this process entry from the list */

857

if(process_list == proc){

858

/* First one - simple */

859

process_list = proc->next;

860

} else {

861

/* Second one or later */

862

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

863

if(p->next == proc){

864

p->next = proc->next;

865

break;

866

}

867

}

868

}

970

869

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

971

870

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,

972

871

NULL);

973

872

if(ret < 0){

974

873

perror("sigprocmask");

975

exitstatus = EXIT_FAILURE;

976

goto fallback;

977

}

978

979

if(plugin_list == NULL){

980

break;

981

}

982

983

plugin *next_plugin = proc->next;

984

free_plugin(proc);

985

proc = next_plugin;

986

continue;

874

}

875

free(proc->buffer);

876

free(proc);

877

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

878

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

879

the process list */

880

break;

987

881

}

988

989

882

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

990

883

991

884

bool bret = print_out_password(proc->buffer,

996

889

}

997

890

goto fallback;

998

891

}

999

1000

892

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

1001

893

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

1002

894

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

1003

proc = proc->next;

1004

895

continue;

1005

896

}

1006

897

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

1019

910

BUFFER_SIZE);

1020

911

if(ret < 0){

1021

912

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

1022

proc = proc->next;

1023

913

continue;

1024

914

}

1025

915

if(ret == 0){

1034

924

1035

925

fallback:

1036

926

1037

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

927

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

1038

928

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

1039

929

occured */

1040

930

bool bret;

1041

931

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

1042

932

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

1043

size_t len = strlen(passwordbuffer);

1044

/* Strip trailing newline */

1045

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

1046

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

1047

len--;

1048

}

1049

bret = print_out_password(passwordbuffer, len);

933

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

1050

934

if(not bret){

1051

935

perror("print_out_password");

1052

936

exitstatus = EXIT_FAILURE;

1061

945

}

1062

946

1063

947

if(custom_argv != NULL){

1064

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

948

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

1065

949

free(*arg);

1066

950

}

1067

951

free(custom_argv);

1068

952

}

953

free_plugin_list(plugin_list);

1069

954

1070

955

if(dir != NULL){

1071

956

closedir(dir);

1072

957

}

1073

958

1074

959

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

1075

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

1076

if(p->pid != 0){

1077

close(p->fd);

1078

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

1079

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

1080

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

1081

perror("kill");

1082

}

960

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

961

next = process_list->next;

962

close(process_list->fd);

963

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

964

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

965

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

966

perror("kill");

1083

967

}

968

free(process_list->buffer);

969

free(process_list);

1084

970

}

1085

971

1086

972

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

1090

976

if(errno != ECHILD){

1091

977

perror("wait");

1092

978

}

1093

1094

free_plugin_list();

1095

1096

free(plugindir);

1097

free(argfile);

1098

979

1099

980

return exitstatus;

1100

981

}