/mandos/trunk : revision 177

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:

428

argfile = strdup(arg);

429

if(argfile == NULL){

430

perror("strdup");

431

}

432

break;

433

case 130:

463

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

464

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

465

break;

466

case 130: /* --userid */

434

467

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

435

468

break;

436

case 131:

469

case 131: /* --groupid */

437

470

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

438

471

break;

439

case 132:

472

case 132: /* --debug */

440

473

debug = true;

441

474

break;

442

475

case ARGP_KEY_ARG:

450

483

return 0;

451

484

}

452

485

453

plugin *plugin_list = NULL;

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

}

454

518

455

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

456

.args_doc = "[+PLUS_SEPARATED_OPTIONS]",

519

struct argp argp = { .options = options,

520

.parser = parse_opt_config_file,

521

.args_doc = "",

457

522

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

458

523

459

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

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);

460

527

if (ret == ARGP_ERR_UNKNOWN){

461

528

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

462

529

exitstatus = EXIT_FAILURE;

463

530

goto fallback;

464

531

}

465

532

533

/* Reset to the normal argument parser */

534

argp.parser = parse_opt;

535

536

/* Open the configfile if available */

466

537

if (argfile == NULL){

467

538

conffp = fopen(AFILE, "r");

468

539

} else {

469

540

conffp = fopen(argfile, "r");

470

}

471

541

}

472

542

if(conffp != NULL){

473

543

char *org_line = NULL;

474

544

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

486

556

}

487

557

custom_argv[0] = argv[0];

488

558

custom_argv[1] = NULL;

489

559

560

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

561

commented text */

490

562

while(true){

491

563

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

492

564

if(sret == -1){

521

593

}

522

594

}

523

595

free(org_line);

524

} else{

596

} else {

525

597

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

526

598

not affect opening plugins */

527

599

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

530

602

goto fallback;

531

603

}

532

604

}

533

605

/* If there was any arguments from configuration file,

606

pass them to parser as command arguments */

534

607

if(custom_argv != NULL){

535

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

608

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

609

0, NULL);

536

610

if (ret == ARGP_ERR_UNKNOWN){

537

611

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

538

612

exitstatus = EXIT_FAILURE;

540

614

}

541

615

}

542

616

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

543

626

if(debug){

544

627

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

545

628

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

554

637

}

555

638

}

556

639

640

/* Strip permissions down to nobody */

557

641

ret = setuid(uid);

558

642

if (ret == -1){

559

643

perror("setuid");

560

}

561

644

}

562

645

setgid(gid);

563

646

if (ret == -1){

564

647

perror("setgid");

565

648

}

566

649

567

650

if (plugindir == NULL){

568

651

dir = opendir(PDIR);

569

652

} else {

591

674

592

675

FD_ZERO(&rfds_all);

593

676

677

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

594

678

while(true){

595

679

dirst = readdir(dir);

596

680

597

// All directory entries have been processed

681

/* All directory entries have been processed */

598

682

if(dirst == NULL){

599

683

if (errno == EBADF){

600

684

perror("readdir");

606

690

607

691

d_name_len = strlen(dirst->d_name);

608

692

609

// Ignore dotfiles, backup files and other junk

693

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

610

694

{

611

695

bool bad_name = false;

612

696

627

711

break;

628

712

}

629

713

}

630

631

714

if(bad_name){

632

715

continue;

633

716

}

634

635

717

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

636

718

size_t suf_len = strlen(*suf);

637

719

if((d_name_len >= suf_len)

652

734

}

653

735

654

736

char *filename;

655

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

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

}

656

742

if(ret < 0){

657

743

perror("asprintf");

658

744

continue;

664

750

free(filename);

665

751

continue;

666

752

}

667

753

754

/* Ignore non-executable files */

668

755

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

669

756

if(debug){

670

757

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

673

760

free(filename);

674

761

continue;

675

762

}

676

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

763

764

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

677

765

if(p == NULL){

678

766

perror("getplugin");

679

767

free(filename);

689

777

}

690

778

{

691

779

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

692

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

780

plugin *g = getplugin(NULL);

693

781

if(g != NULL){

694

782

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

695

783

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

698

786

}

699

787

/* Add global environment variables */

700

788

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

701

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

789

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

702

790

perror("add_environment");

703

791

}

704

792

}

709

797

process, too. */

710

798

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

711

799

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)){

800

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

718

801

perror("add_environment");

719

802

}

720

803

}

727

810

exitstatus = EXIT_FAILURE;

728

811

goto fallback;

729

812

}

813

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

730

814

ret = set_cloexec_flag(pipefd[0]);

731

815

if(ret < 0){

732

816

perror("set_cloexec_flag");

746

830

exitstatus = EXIT_FAILURE;

747

831

goto fallback;

748

832

}

749

// Starting a new process to be watched

833

/* Starting a new process to be watched */

750

834

pid_t pid = fork();

751

835

if(pid == -1){

752

836

perror("fork");

790

874

}

791

875

/* no return */

792

876

}

793

/* parent process */

877

/* Parent process */

878

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

794

879

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");

880

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

881

if (new_plugin == NULL){

882

perror("getplugin");

799

883

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

800

884

if(ret < 0){

801

perror("sigprocmask");

885

perror("sigprocmask");

802

886

}

803

887

exitstatus = EXIT_FAILURE;

804

888

goto fallback;

805

889

}

806

890

807

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

808

.fd = pipefd[0],

809

.next = process_list };

810

// List handling

811

process_list = new_process;

891

new_plugin->pid = pid;

892

new_plugin->fd = pipefd[0];

893

812

894

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

813

895

has already completed */

814

896

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

818

900

goto fallback;

819

901

}

820

902

821

FD_SET(new_process->fd, &rfds_all);

903

FD_SET(new_plugin->fd, &rfds_all);

822

904

823

if (maxfd < new_process->fd){

824

maxfd = new_process->fd;

905

if (maxfd < new_plugin->fd){

906

maxfd = new_plugin->fd;

825

907

}

826

908

827

909

}

828

829

free_plugin_list(plugin_list);

830

plugin_list = NULL;

831

910

832

911

closedir(dir);

833

912

dir = NULL;

834

835

if (process_list == NULL){

836

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

837

" directory?\n");

838

process_list = 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

}

839

923

}

840

while(process_list){

924

925

/* Main loop while running plugins exist */

926

while(plugin_list){

841

927

fd_set rfds = rfds_all;

842

928

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

843

929

if (select_ret == -1){

847

933

}

848

934

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

849

935

from one of them */

850

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

936

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

851

937

/* Is this process completely done? */

852

938

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

853

939

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

854

940

if(not WIFEXITED(proc->status)

855

941

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

856

942

/* Bad exit by plugin */

943

857

944

if(debug){

858

945

if(WIFEXITED(proc->status)){

859

946

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

868

955

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

869

956

}

870

957

}

958

871

959

/* Remove the plugin */

872

960

FD_CLR(proc->fd, &rfds_all);

961

873

962

/* Block signal while modifying process_list */

874

963

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

875

964

if(ret < 0){

877

966

exitstatus = EXIT_FAILURE;

878

967

goto fallback;

879

968

}

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

}

969

893

970

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

894

971

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,

895

972

NULL);

896

973

if(ret < 0){

897

974

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;

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;

905

987

}

988

906

989

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

907

990

908

991

bool bret = print_out_password(proc->buffer,

913

996

}

914

997

goto fallback;

915

998

}

999

916

1000

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

917

1001

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

918

1002

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

1003

proc = proc->next;

919

1004

continue;

920

1005

}

921

1006

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

934

1019

BUFFER_SIZE);

935

1020

if(ret < 0){

936

1021

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

1022

proc = proc->next;

937

1023

continue;

938

1024

}

939

1025

if(ret == 0){

948

1034

949

1035

fallback:

950

1036

951

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

1037

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

952

1038

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

953

1039

occured */

954

1040

bool bret;

955

1041

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

956

1042

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

957

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

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);

958

1050

if(not bret){

959

1051

perror("print_out_password");

960

1052

exitstatus = EXIT_FAILURE;

974

1066

}

975

1067

free(custom_argv);

976

1068

}

977

free_plugin_list(plugin_list);

978

1069

979

1070

if(dir != NULL){

980

1071

closedir(dir);

981

1072

}

982

1073

983

1074

/* 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");

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

}

991

1083

}

992

free(process_list->buffer);

993

free(process_list);

994

1084

}

995

1085

996

1086

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

1001

1091

perror("wait");

1002

1092

}

1003

1093

1094

free_plugin_list();

1095

1004

1096

free(plugindir);

1005

1097

free(argfile);

1006

1098