/mandos/trunk : revision 109

72

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

73

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

74

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*/

75

struct process;

76

77

typedef struct process{

86

78

pid_t pid;

87

79

int fd;

88

80

char *buffer;

91

83

bool eof;

92

84

volatile bool completed;

93

85

volatile int status;

86

struct process *next;

87

} process;

88

89

typedef struct plugin{

90

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

91

char **argv;

92

int argc;

93

char **environ;

94

int envc;

95

bool disabled;

94

96

struct plugin *next;

95

97

} plugin;

96

98

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){

99

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

100

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

104

101

if ((p->name == name)

105

102

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

106

103

return p;

121

118

122

119

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

123

120

.argc = 1,

121

.envc = 0,

124

122

.disabled = false,

125

.next = plugin_list };

123

.next = *plugin_list };

126

124

127

125

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

128

126

if (new_plugin->argv == NULL){

132

130

}

133

131

new_plugin->argv[0] = copy_name;

134

132

new_plugin->argv[1] = NULL;

135

133

136

134

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

137

135

if(new_plugin->environ == NULL){

138

136

free(copy_name);

141

139

return NULL;

142

140

}

143

141

new_plugin->environ[0] = NULL;

144

145

142

/* Append the new plugin to the list */

146

plugin_list = new_plugin;

143

*plugin_list = new_plugin;

147

144

return new_plugin;

148

145

}

149

146

179

176

}

180

177

181

178

/* Add to a plugin's environment */

182

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

179

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

183

180

if(p == NULL){

184

181

return false;

185

182

}

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

183

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

204

184

}

205

185

186

206

187

/*

207

188

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

208

189

* Descriptor Flags".

219

200

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

220

201

}

221

202

203

process *process_list = NULL;

222

204

223

205

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

224

206

status. */

225

207

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

226

208

while(true){

227

plugin *proc = plugin_list;

209

process *proc = process_list;

228

210

int status;

229

211

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

230

212

if(pid == 0){

238

220

/* No child processes */

239

221

break;

240

222

}

241

223

242

224

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

243

225

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

244

226

proc = proc->next;

252

234

}

253

235

}

254

236

255

/* Prints out a password to stdout */

256

237

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

257

238

ssize_t ret;

239

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

240

length--;

241

}

258

242

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

259

243

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

260

244

length - written));

265

249

return true;

266

250

}

267

251

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

}

292

}

293

}

294

295

free(plugin_node);

296

}

297

298

static void free_plugin_list(void){

299

while(plugin_list != NULL){

300

free_plugin(plugin_list);

252

static void free_plugin_list(plugin *plugin_list){

253

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

254

next = plugin_list->next;

255

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

256

free(*arg);

257

}

258

free(plugin_list->argv);

259

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

260

free(*env);

261

}

262

free(plugin_list->environ);

263

free(plugin_list);

301

264

}

302

265

}

303

266

341

304

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

342

305

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

343

306

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

344

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

307

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

345

308

.arg = "VAR=value",

346

309

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

347

310

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

348

311

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

349

312

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

350

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

313

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

351

314

.arg = "PLUGIN:ENV=value",

352

315

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

353

316

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

354

317

.arg = "PLUGIN",

355

318

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

356

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

357

.arg = "PLUGIN",

358

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

359

319

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

360

320

.arg = "DIRECTORY",

361

321

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

373

333

{ .name = NULL }

374

334

};

375

335

376

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

377

struct argp_state *state) {

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;

378

340

switch (key) {

379

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

341

case 'g':

380

342

if (arg != NULL){

381

343

char *p;

382

344

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

383

345

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

384

346

continue;

385

347

}

386

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

348

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

387

349

perror("add_argument");

388

350

return ARGP_ERR_UNKNOWN;

389

351

}

390

352

}

391

353

}

392

354

break;

393

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

355

case 'e':

394

356

if(arg == NULL){

395

357

break;

396

358

}

397

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

398

perror("add_environment");

359

{

360

char *envdef = strdup(arg);

361

if(envdef == NULL){

362

break;

363

}

364

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

365

perror("add_environment");

366

}

399

367

}

400

368

break;

401

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

369

case 'o':

402

370

if (arg != NULL){

403

371

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

404

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

372

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

405

373

break;

406

374

}

407

375

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

408

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

376

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

409

377

break;

410

378

}

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;

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

}

419

389

}

420

390

}

421

391

}

422

392

break;

423

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

393

case 'f':

424

394

if(arg == NULL){

425

395

break;

426

396

}

429

399

if(envdef == NULL){

430

400

break;

431

401

}

432

*envdef = '\0';

433

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

402

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

403

if(p_name == NULL){

404

break;

405

}

406

envdef++;

407

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

434

408

perror("add_environment");

435

409

}

436

410

}

437

411

break;

438

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

412

case 'd':

439

413

if (arg != NULL){

440

plugin *p = getplugin(arg);

414

plugin *p = getplugin(arg, plugins);

441

415

if(p == NULL){

442

416

return ARGP_ERR_UNKNOWN;

443

417

}

444

418

p->disabled = true;

445

419

}

446

420

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);

421

case 128:

458

422

plugindir = strdup(arg);

459

423

if(plugindir == NULL){

460

424

perror("strdup");

461

425

}

462

426

break;

463

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

464

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

465

break;

466

case 130: /* --userid */

427

case 129:

428

argfile = strdup(arg);

429

if(argfile == NULL){

430

perror("strdup");

431

}

432

break;

433

case 130:

467

434

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

468

435

break;

469

case 131: /* --groupid */

436

case 131:

470

437

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

471

438

break;

472

case 132: /* --debug */

439

case 132:

473

440

debug = true;

474

441

break;

475

442

case ARGP_KEY_ARG:

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 = "",

443

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

444

break;

445

case ARGP_KEY_END:

446

break;

447

default:

448

return ARGP_ERR_UNKNOWN;

449

}

450

return 0;

451

}

452

453

plugin *plugin_list = NULL;

454

455

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

456

.args_doc = "[+PLUS_SEPARATED_OPTIONS]",

527

457

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

528

458

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);

459

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

532

460

if (ret == ARGP_ERR_UNKNOWN){

533

461

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

534

462

exitstatus = EXIT_FAILURE;

535

463

goto fallback;

536

464

}

537

538

/* Reset to the normal argument parser */

539

argp.parser = parse_opt;

540

541

/* Open the configfile if available */

465

542

466

if (argfile == NULL){

543

467

conffp = fopen(AFILE, "r");

544

468

} else {

545

469

conffp = fopen(argfile, "r");

546

}

470

}

471

547

472

if(conffp != NULL){

548

473

char *org_line = NULL;

549

474

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

561

486

}

562

487

custom_argv[0] = argv[0];

563

488

custom_argv[1] = NULL;

564

565

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

566

commented text */

489

567

490

while(true){

568

491

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

569

492

if(sret == -1){

598

521

}

599

522

}

600

523

free(org_line);

601

} else {

524

} else{

602

525

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

603

526

not affect opening plugins */

604

527

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

607

530

goto fallback;

608

531

}

609

532

}

610

/* If there was any arguments from configuration file,

611

pass them to parser as command arguments */

533

612

534

if(custom_argv != NULL){

613

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

614

0, NULL);

535

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

615

536

if (ret == ARGP_ERR_UNKNOWN){

616

537

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

617

538

exitstatus = EXIT_FAILURE;

619

540

}

620

541

}

621

542

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

631

543

if(debug){

632

544

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

633

545

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

642

554

}

643

555

}

644

556

645

/* Strip permissions down to nobody */

646

557

ret = setuid(uid);

647

558

if (ret == -1){

648

559

perror("setuid");

649

}

560

}

561

650

562

setgid(gid);

651

563

if (ret == -1){

652

564

perror("setgid");

653

565

}

654

566

655

567

if (plugindir == NULL){

656

568

dir = opendir(PDIR);

657

569

} else {

679

591

680

592

FD_ZERO(&rfds_all);

681

593

682

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

683

594

while(true){

684

595

dirst = readdir(dir);

685

596

686

/* All directory entries have been processed */

597

// All directory entries have been processed

687

598

if(dirst == NULL){

688

599

if (errno == EBADF){

689

600

perror("readdir");

695

606

696

607

d_name_len = strlen(dirst->d_name);

697

608

698

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

609

// Ignore dotfiles, backup files and other junk

699

610

{

700

611

bool bad_name = false;

701

612

716

627

break;

717

628

}

718

629

}

630

719

631

if(bad_name){

720

632

continue;

721

633

}

634

722

635

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

723

636

size_t suf_len = strlen(*suf);

724

637

if((d_name_len >= suf_len)

739

652

}

740

653

741

654

char *filename;

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

}

655

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

747

656

if(ret < 0){

748

657

perror("asprintf");

749

658

continue;

755

664

free(filename);

756

665

continue;

757

666

}

758

759

/* Ignore non-executable files */

667

760

668

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

761

669

if(debug){

762

670

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

765

673

free(filename);

766

674

continue;

767

675

}

768

769

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

676

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

770

677

if(p == NULL){

771

678

perror("getplugin");

772

679

free(filename);

782

689

}

783

690

{

784

691

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

785

plugin *g = getplugin(NULL);

692

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

786

693

if(g != NULL){

787

694

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

788

695

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

791

698

}

792

699

/* Add global environment variables */

793

700

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

794

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

701

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

795

702

perror("add_environment");

796

703

}

797

704

}

802

709

process, too. */

803

710

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

804

711

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

805

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

712

char *copy = strdup(*e);

713

if(copy == NULL){

714

perror("strdup");

715

continue;

716

}

717

if(not add_environment(p, copy)){

806

718

perror("add_environment");

807

719

}

808

720

}

815

727

exitstatus = EXIT_FAILURE;

816

728

goto fallback;

817

729

}

818

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

819

730

ret = set_cloexec_flag(pipefd[0]);

820

731

if(ret < 0){

821

732

perror("set_cloexec_flag");

835

746

exitstatus = EXIT_FAILURE;

836

747

goto fallback;

837

748

}

838

/* Starting a new process to be watched */

749

// Starting a new process to be watched

839

750

pid_t pid = fork();

840

751

if(pid == -1){

841

752

perror("fork");

879

790

}

880

791

/* no return */

881

792

}

882

/* Parent process */

883

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

793

/* parent process */

884

794

free(filename);

885

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

886

if (new_plugin == NULL){

887

perror("getplugin");

795

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

796

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

797

if (new_process == NULL){

798

perror("malloc");

888

799

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

889

800

if(ret < 0){

890

perror("sigprocmask");

801

perror("sigprocmask");

891

802

}

892

803

exitstatus = EXIT_FAILURE;

893

804

goto fallback;

894

805

}

895

806

896

new_plugin->pid = pid;

897

new_plugin->fd = pipefd[0];

898

807

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

808

.fd = pipefd[0],

809

.next = process_list };

810

// List handling

811

process_list = new_process;

899

812

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

900

813

has already completed */

901

814

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

905

818

goto fallback;

906

819

}

907

820

908

FD_SET(new_plugin->fd, &rfds_all);

821

FD_SET(new_process->fd, &rfds_all);

909

822

910

if (maxfd < new_plugin->fd){

911

maxfd = new_plugin->fd;

823

if (maxfd < new_process->fd){

824

maxfd = new_process->fd;

912

825

}

913

826

914

827

}

828

829

free_plugin_list(plugin_list);

830

plugin_list = NULL;

915

831

916

832

closedir(dir);

917

833

dir = 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

}

834

835

if (process_list == NULL){

836

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

837

" directory?\n");

838

process_list = NULL;

928

839

}

929

930

/* Main loop while running plugins exist */

931

while(plugin_list){

840

while(process_list){

932

841

fd_set rfds = rfds_all;

933

842

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

934

843

if (select_ret == -1){

938

847

}

939

848

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

940

849

from one of them */

941

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

850

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

942

851

/* Is this process completely done? */

943

852

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

944

853

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

945

854

if(not WIFEXITED(proc->status)

946

855

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

947

856

/* Bad exit by plugin */

948

949

857

if(debug){

950

858

if(WIFEXITED(proc->status)){

951

859

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

960

868

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

961

869

}

962

870

}

963

964

871

/* Remove the plugin */

965

872

FD_CLR(proc->fd, &rfds_all);

966

967

873

/* Block signal while modifying process_list */

968

874

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

969

875

if(ret < 0){

971

877

exitstatus = EXIT_FAILURE;

972

878

goto fallback;

973

879

}

974

880

/* Delete this process entry from the list */

881

if(process_list == proc){

882

/* First one - simple */

883

process_list = proc->next;

884

} else {

885

/* Second one or later */

886

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

887

if(p->next == proc){

888

p->next = proc->next;

889

break;

890

}

891

}

892

}

975

893

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

976

894

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,

977

895

NULL);

978

896

if(ret < 0){

979

897

perror("sigprocmask");

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;

898

}

899

free(proc->buffer);

900

free(proc);

901

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

902

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

903

the process list */

904

break;

992

905

}

993

994

906

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

995

907

996

908

bool bret = print_out_password(proc->buffer,

1001

913

}

1002

914

goto fallback;

1003

915

}

1004

1005

916

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

1006

917

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

1007

918

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

1008

proc = proc->next;

1009

919

continue;

1010

920

}

1011

921

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

1024

934

BUFFER_SIZE);

1025

935

if(ret < 0){

1026

936

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

1027

proc = proc->next;

1028

937

continue;

1029

938

}

1030

939

if(ret == 0){

1039

948

1040

949

fallback:

1041

950

1042

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

951

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

1043

952

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

1044

953

occured */

1045

954

bool bret;

1046

955

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

1047

956

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

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);

957

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

1055

958

if(not bret){

1056

959

perror("print_out_password");

1057

960

exitstatus = EXIT_FAILURE;

1071

974

}

1072

975

free(custom_argv);

1073

976

}

977

free_plugin_list(plugin_list);

1074

978

1075

979

if(dir != NULL){

1076

980

closedir(dir);

1077

981

}

1078

982

1079

983

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

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

}

984

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

985

next = process_list->next;

986

close(process_list->fd);

987

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

988

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

989

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

990

perror("kill");

1088

991

}

992

free(process_list->buffer);

993

free(process_list);

1089

994

}

1090

995

1091

996

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

1096

1001

perror("wait");

1097

1002

}

1098

1003

1099

free_plugin_list();

1100

1101

1004

free(plugindir);

1102

1005

free(argfile);

1103

1006