/mandos/trunk : revision 180

72

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

73

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

74

75

struct process;

76

77

typedef struct process{

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*/

78

86

pid_t pid;

79

87

int fd;

80

88

char *buffer;

83

91

bool eof;

84

92

volatile bool completed;

85

93

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;

96

94

struct plugin *next;

97

95

} plugin;

98

96

99

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

100

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

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){

101

104

if ((p->name == name)

102

105

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

103

106

return p;

118

121

119

122

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

120

123

.argc = 1,

121

.envc = 0,

122

124

.disabled = false,

123

.next = *plugin_list };

125

.next = plugin_list };

124

126

125

127

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

126

128

if (new_plugin->argv == NULL){

130

132

}

131

133

new_plugin->argv[0] = copy_name;

132

134

new_plugin->argv[1] = NULL;

133

135

134

136

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

135

137

if(new_plugin->environ == NULL){

136

138

free(copy_name);

139

141

return NULL;

140

142

}

141

143

new_plugin->environ[0] = NULL;

144

142

145

/* Append the new plugin to the list */

143

*plugin_list = new_plugin;

146

plugin_list = new_plugin;

144

147

return new_plugin;

145

148

}

146

149

176

179

}

177

180

178

181

/* Add to a plugin's environment */

179

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

182

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

180

183

if(p == NULL){

181

184

return false;

182

185

}

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

}

183

203

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

184

204

}

185

205

186

187

206

/*

188

207

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

189

208

* Descriptor Flags".

200

219

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

201

220

}

202

221

203

process *process_list = NULL;

204

222

205

223

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

206

224

status. */

207

225

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

208

226

while(true){

209

process *proc = process_list;

227

plugin *proc = plugin_list;

210

228

int status;

211

229

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

212

230

if(pid == 0){

220

238

/* No child processes */

221

239

break;

222

240

}

223

241

224

242

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

225

243

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

226

244

proc = proc->next;

234

252

}

235

253

}

236

254

255

/* Prints out a password to stdout */

237

256

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

238

257

ssize_t ret;

239

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

240

length--;

241

}

242

258

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

243

259

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

244

260

length - written));

249

265

return true;

250

266

}

251

267

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);

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);

264

301

}

265

302

}

266

303

304

341

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

305

342

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

306

343

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

307

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

344

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

308

345

.arg = "VAR=value",

309

346

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

310

347

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

311

348

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

312

349

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

313

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

350

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

314

351

.arg = "PLUGIN:ENV=value",

315

352

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

316

353

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

317

354

.arg = "PLUGIN",

318

355

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

356

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

357

.arg = "PLUGIN",

358

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

319

359

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

320

360

.arg = "DIRECTORY",

321

361

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

333

373

{ .name = NULL }

334

374

};

335

375

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;

376

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

377

struct argp_state *state) {

340

378

switch (key) {

341

case 'g':

379

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

342

380

if (arg != NULL){

343

381

char *p;

344

382

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

345

383

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

346

384

continue;

347

385

}

348

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

386

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

349

387

perror("add_argument");

350

388

return ARGP_ERR_UNKNOWN;

351

389

}

352

390

}

353

391

}

354

392

break;

355

case 'e':

393

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

356

394

if(arg == NULL){

357

395

break;

358

396

}

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

}

397

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

398

perror("add_environment");

367

399

}

368

400

break;

369

case 'o':

401

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

370

402

if (arg != NULL){

371

403

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

372

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

404

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

373

405

break;

374

406

}

375

407

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

376

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

408

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

377

409

break;

378

410

}

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

}

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;

389

419

}

390

420

}

391

421

}

392

422

break;

393

case 'f':

423

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

394

424

if(arg == NULL){

395

425

break;

396

426

}

399

429

if(envdef == NULL){

400

430

break;

401

431

}

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)){

432

*envdef = '\0';

433

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

408

434

perror("add_environment");

409

435

}

410

436

}

411

437

break;

412

case 'd':

438

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

413

439

if (arg != NULL){

414

plugin *p = getplugin(arg, plugins);

440

plugin *p = getplugin(arg);

415

441

if(p == NULL){

416

442

return ARGP_ERR_UNKNOWN;

417

443

}

418

444

p->disabled = true;

419

445

}

420

446

break;

421

case 128:

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);

422

458

plugindir = strdup(arg);

423

459

if(plugindir == NULL){

424

460

perror("strdup");

425

461

}

426

462

break;

427

case 129:

463

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

464

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

465

break;

466

case 130: /* --userid */

467

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

468

break;

469

case 131: /* --groupid */

470

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

471

break;

472

case 132: /* --debug */

473

debug = true;

474

break;

475

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);

428

507

argfile = strdup(arg);

429

508

if(argfile == NULL){

430

509

perror("strdup");

431

510

}

432

511

break;

433

case 130:

434

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

435

break;

436

case 131:

437

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

438

break;

439

case 132:

440

debug = true;

441

break;

512

case 130: /* --userid */

513

case 131: /* --groupid */

514

case 132: /* --debug */

442

515

case ARGP_KEY_ARG:

443

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

444

break;

445

516

case ARGP_KEY_END:

446

517

break;

447

518

default:

450

521

return 0;

451

522

}

452

523

453

plugin *plugin_list = NULL;

454

455

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

456

.args_doc = "[+PLUS_SEPARATED_OPTIONS]",

524

struct argp argp = { .options = options,

525

.parser = parse_opt_config_file,

526

.args_doc = "",

457

527

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

458

528

459

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);

460

532

if (ret == ARGP_ERR_UNKNOWN){

461

533

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

462

534

exitstatus = EXIT_FAILURE;

463

535

goto fallback;

464

536

}

465

537

538

/* Reset to the normal argument parser */

539

argp.parser = parse_opt;

540

541

/* Open the configfile if available */

466

542

if (argfile == NULL){

467

543

conffp = fopen(AFILE, "r");

468

544

} else {

469

545

conffp = fopen(argfile, "r");

470

}

471

546

}

472

547

if(conffp != NULL){

473

548

char *org_line = NULL;

474

549

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

486

561

}

487

562

custom_argv[0] = argv[0];

488

563

custom_argv[1] = NULL;

489

564

565

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

566

commented text */

490

567

while(true){

491

568

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

492

569

if(sret == -1){

521

598

}

522

599

}

523

600

free(org_line);

524

} else{

601

} else {

525

602

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

526

603

not affect opening plugins */

527

604

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

530

607

goto fallback;

531

608

}

532

609

}

533

610

/* If there was any arguments from configuration file,

611

pass them to parser as command arguments */

534

612

if(custom_argv != NULL){

535

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

613

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

614

0, NULL);

536

615

if (ret == ARGP_ERR_UNKNOWN){

537

616

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

538

617

exitstatus = EXIT_FAILURE;

540

619

}

541

620

}

542

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

543

631

if(debug){

544

632

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

545

633

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

554

642

}

555

643

}

556

644

645

/* Strip permissions down to nobody */

557

646

ret = setuid(uid);

558

647

if (ret == -1){

559

648

perror("setuid");

560

}

561

649

}

562

650

setgid(gid);

563

651

if (ret == -1){

564

652

perror("setgid");

565

653

}

566

654

567

655

if (plugindir == NULL){

568

656

dir = opendir(PDIR);

569

657

} else {

591

679

592

680

FD_ZERO(&rfds_all);

593

681

682

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

594

683

while(true){

595

684

dirst = readdir(dir);

596

685

597

// All directory entries have been processed

686

/* All directory entries have been processed */

598

687

if(dirst == NULL){

599

688

if (errno == EBADF){

600

689

perror("readdir");

606

695

607

696

d_name_len = strlen(dirst->d_name);

608

697

609

// Ignore dotfiles, backup files and other junk

698

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

610

699

{

611

700

bool bad_name = false;

612

701

627

716

break;

628

717

}

629

718

}

630

631

719

if(bad_name){

632

720

continue;

633

721

}

634

635

722

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

636

723

size_t suf_len = strlen(*suf);

637

724

if((d_name_len >= suf_len)

652

739

}

653

740

654

741

char *filename;

655

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

}

656

747

if(ret < 0){

657

748

perror("asprintf");

658

749

continue;

664

755

free(filename);

665

756

continue;

666

757

}

667

758

759

/* Ignore non-executable files */

668

760

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

669

761

if(debug){

670

762

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

673

765

free(filename);

674

766

continue;

675

767

}

676

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

768

769

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

677

770

if(p == NULL){

678

771

perror("getplugin");

679

772

free(filename);

689

782

}

690

783

{

691

784

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

692

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

785

plugin *g = getplugin(NULL);

693

786

if(g != NULL){

694

787

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

695

788

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

698

791

}

699

792

/* Add global environment variables */

700

793

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

701

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

794

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

702

795

perror("add_environment");

703

796

}

704

797

}

709

802

process, too. */

710

803

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

711

804

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

712

char *copy = strdup(*e);

713

if(copy == NULL){

714

perror("strdup");

715

continue;

716

}

717

if(not add_environment(p, copy)){

805

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

718

806

perror("add_environment");

719

807

}

720

808

}

727

815

exitstatus = EXIT_FAILURE;

728

816

goto fallback;

729

817

}

818

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

730

819

ret = set_cloexec_flag(pipefd[0]);

731

820

if(ret < 0){

732

821

perror("set_cloexec_flag");

746

835

exitstatus = EXIT_FAILURE;

747

836

goto fallback;

748

837

}

749

// Starting a new process to be watched

838

/* Starting a new process to be watched */

750

839

pid_t pid = fork();

751

840

if(pid == -1){

752

841

perror("fork");

790

879

}

791

880

/* no return */

792

881

}

793

/* parent process */

882

/* Parent process */

883

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

794

884

free(filename);

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");

885

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

886

if (new_plugin == NULL){

887

perror("getplugin");

799

888

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

800

889

if(ret < 0){

801

perror("sigprocmask");

890

perror("sigprocmask");

802

891

}

803

892

exitstatus = EXIT_FAILURE;

804

893

goto fallback;

805

894

}

806

895

807

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

808

.fd = pipefd[0],

809

.next = process_list };

810

// List handling

811

process_list = new_process;

896

new_plugin->pid = pid;

897

new_plugin->fd = pipefd[0];

898

812

899

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

813

900

has already completed */

814

901

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

818

905

goto fallback;

819

906

}

820

907

821

FD_SET(new_process->fd, &rfds_all);

908

FD_SET(new_plugin->fd, &rfds_all);

822

909

823

if (maxfd < new_process->fd){

824

maxfd = new_process->fd;

910

if (maxfd < new_plugin->fd){

911

maxfd = new_plugin->fd;

825

912

}

826

913

827

914

}

828

829

free_plugin_list(plugin_list);

830

plugin_list = NULL;

831

915

832

916

closedir(dir);

833

917

dir = NULL;

834

835

if (process_list == NULL){

836

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

837

" directory?\n");

838

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

}

839

928

}

840

while(process_list){

929

930

/* Main loop while running plugins exist */

931

while(plugin_list){

841

932

fd_set rfds = rfds_all;

842

933

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

843

934

if (select_ret == -1){

847

938

}

848

939

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

849

940

from one of them */

850

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

941

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

851

942

/* Is this process completely done? */

852

943

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

853

944

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

854

945

if(not WIFEXITED(proc->status)

855

946

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

856

947

/* Bad exit by plugin */

948

857

949

if(debug){

858

950

if(WIFEXITED(proc->status)){

859

951

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

868

960

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

869

961

}

870

962

}

963

871

964

/* Remove the plugin */

872

965

FD_CLR(proc->fd, &rfds_all);

966

873

967

/* Block signal while modifying process_list */

874

968

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

875

969

if(ret < 0){

877

971

exitstatus = EXIT_FAILURE;

878

972

goto fallback;

879

973

}

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

}

974

893

975

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

894

976

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,

895

977

NULL);

896

978

if(ret < 0){

897

979

perror("sigprocmask");

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;

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;

905

992

}

993

906

994

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

907

995

908

996

bool bret = print_out_password(proc->buffer,

913

1001

}

914

1002

goto fallback;

915

1003

}

1004

916

1005

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

917

1006

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

918

1007

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

1008

proc = proc->next;

919

1009

continue;

920

1010

}

921

1011

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

934

1024

BUFFER_SIZE);

935

1025

if(ret < 0){

936

1026

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

1027

proc = proc->next;

937

1028

continue;

938

1029

}

939

1030

if(ret == 0){

948

1039

949

1040

fallback:

950

1041

951

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

1042

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

952

1043

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

953

1044

occured */

954

1045

bool bret;

955

1046

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

956

1047

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

957

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);

958

1055

if(not bret){

959

1056

perror("print_out_password");

960

1057

exitstatus = EXIT_FAILURE;

974

1071

}

975

1072

free(custom_argv);

976

1073

}

977

free_plugin_list(plugin_list);

978

1074

979

1075

if(dir != NULL){

980

1076

closedir(dir);

981

1077

}

982

1078

983

1079

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

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");

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

}

991

1088

}

992

free(process_list->buffer);

993

free(process_list);

994

1089

}

995

1090

996

1091

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

1001

1096

perror("wait");

1002

1097

}

1003

1098

1099

free_plugin_list();

1100

1004

1101

free(plugindir);

1005

1102

free(argfile);

1006

1103