/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 a 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;

118

113

return NULL;

119

114

}

120

115

}

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));

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){

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;

258

237

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

268

247

return true;

269

248

}

270

249

271

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

272

static void free_plugin(plugin *plugin_node){

273

274

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

275

free(*arg);

276

}

277

free(plugin_node->argv);

278

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

279

free(*env);

280

}

281

free(plugin_node->environ);

282

free(plugin_node->buffer);

283

284

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

285

if(plugin_node == plugin_list){

286

/* First one - simple */

287

plugin_list = plugin_list->next;

288

} else {

289

/* Second one or later */

290

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

291

if(p->next == plugin_node){

292

p->next = plugin_node->next;

293

break;

294

}

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;

295

256

}

296

}

297

298

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;

299

269

}

300

270

301

static void free_plugin_list(void){

302

while(plugin_list != NULL){

303

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);

304

283

}

305

284

}

306

285

307

286

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

308

char *plugindir = NULL;

309

char *argfile = NULL;

287

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

288

const char *argfile = ARGFILE;

310

289

FILE *conffp;

311

290

size_t d_name_len;

312

291

DIR *dir = NULL;

344

323

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

345

324

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

346

325

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

347

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

326

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

348

327

.arg = "VAR=value",

349

328

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

350

329

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

351

330

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

352

331

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

353

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

332

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

354

333

.arg = "PLUGIN:ENV=value",

355

334

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

356

335

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

357

336

.arg = "PLUGIN",

358

337

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

359

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

360

.arg = "PLUGIN",

361

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

362

338

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

363

339

.arg = "DIRECTORY",

364

340

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

365

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

366

.arg = "FILE",

367

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

368

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

369

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

370

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

371

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

372

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

373

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

374

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

375

.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 },

376

349

{ .name = NULL }

377

350

};

378

351

379

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

380

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;

381

356

switch (key) {

382

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

357

case 'g':

383

358

if (arg != NULL){

384

359

char *p;

385

360

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

386

361

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

387

362

continue;

388

363

}

389

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

364

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

390

365

perror("add_argument");

391

366

return ARGP_ERR_UNKNOWN;

392

367

}

393

368

}

394

369

}

395

370

break;

396

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

371

case 'e':

397

372

if(arg == NULL){

398

373

break;

399

374

}

402

377

if(envdef == NULL){

403

378

break;

404

379

}

405

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

380

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

406

381

perror("add_environment");

407

382

}

408

383

}

409

384

break;

410

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

385

case 'o':

411

386

if (arg != NULL){

412

387

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

413

388

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

423

398

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

424

399

continue;

425

400

}

426

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

401

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

427

402

perror("add_argument");

428

403

return ARGP_ERR_UNKNOWN;

429

404

}

431

406

}

432

407

}

433

408

break;

434

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

409

case 'f':

435

410

if(arg == NULL){

436

411

break;

437

412

}

445

420

break;

446

421

}

447

422

envdef++;

448

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

423

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

449

424

perror("add_environment");

450

425

}

451

426

}

452

427

break;

453

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

428

case 'd':

454

429

if (arg != NULL){

455

plugin *p = getplugin(arg);

430

plugin *p = getplugin(arg, plugins);

456

431

if(p == NULL){

457

432

return ARGP_ERR_UNKNOWN;

458

433

}

459

434

p->disabled = true;

460

435

}

461

436

break;

462

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

463

if (arg != NULL){

464

plugin *p = getplugin(arg);

465

if(p == NULL){

466

return ARGP_ERR_UNKNOWN;

467

}

468

p->disabled = false;

469

}

470

break;

471

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

472

plugindir = strdup(arg);

473

if(plugindir == NULL){

474

perror("strdup");

475

}

476

break;

477

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

478

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

479

break;

480

case 130: /* --userid */

437

case 128:

438

plugindir = arg;

439

break;

440

case 129:

481

441

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

482

442

break;

483

case 131: /* --groupid */

443

case 130:

484

444

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

485

445

break;

486

case 132: /* --debug */

446

case 131:

487

447

debug = true;

488

448

break;

489

449

case ARGP_KEY_ARG:

497

457

return 0;

498

458

}

499

459

500

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

501

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

502

error_t parse_opt_config_file (int key, char *arg,

503

__attribute__((unused))

504

struct argp_state *state) {

505

switch (key) {

506

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

507

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

508

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

509

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

510

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

511

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

512

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

513

break;

514

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

515

argfile = strdup(arg);

516

if(argfile == NULL){

517

perror("strdup");

518

}

519

break;

520

case 130: /* --userid */

521

case 131: /* --groupid */

522

case 132: /* --debug */

523

case ARGP_KEY_ARG:

524

case ARGP_KEY_END:

525

break;

526

default:

527

return ARGP_ERR_UNKNOWN;

528

}

529

return 0;

530

}

460

plugin *plugin_list = NULL;

531

461

532

struct argp argp = { .options = options,

533

.parser = parse_opt_config_file,

534

.args_doc = "",

462

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

463

.args_doc = "[+PLUS_SEPARATED_OPTIONS]",

535

464

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

536

465

537

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

538

config file location, if any. */

539

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

466

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

540

467

if (ret == ARGP_ERR_UNKNOWN){

541

468

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

542

469

exitstatus = EXIT_FAILURE;

543

470

goto fallback;

544

471

}

545

546

/* Reset to the normal argument parser */

547

argp.parser = parse_opt;

548

549

/* Open the configfile if available */

550

if (argfile == NULL){

551

conffp = fopen(AFILE, "r");

552

} else {

553

conffp = fopen(argfile, "r");

554

}

472

473

conffp = fopen(argfile, "r");

555

474

if(conffp != NULL){

556

475

char *org_line = NULL;

557

476

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

560

479

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

561

480

const char comment_delim[] = "#";

562

481

563

custom_argc = 1;

564

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

565

if(custom_argv == NULL){

566

perror("malloc");

567

exitstatus = EXIT_FAILURE;

568

goto fallback;

569

}

570

custom_argv[0] = argv[0];

571

custom_argv[1] = NULL;

572

573

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

574

commented text */

575

482

while(true){

576

483

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

577

484

if(sret == -1){

585

492

continue;

586

493

}

587

494

new_arg = strdup(p);

588

if(new_arg == NULL){

589

perror("strdup");

590

exitstatus = EXIT_FAILURE;

591

free(org_line);

592

goto fallback;

593

}

594

595

custom_argc += 1;

596

custom_argv = realloc(custom_argv, sizeof(char *)

597

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

598

if(custom_argv == NULL){

599

perror("realloc");

600

exitstatus = EXIT_FAILURE;

601

free(org_line);

602

goto fallback;

603

}

604

custom_argv[custom_argc-1] = new_arg;

605

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

}

606

501

}

607

502

}

608

503

free(org_line);

609

} else {

504

} else{

610

505

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

611

506

not affect opening plugins */

612

507

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

615

510

goto fallback;

616

511

}

617

512

}

618

/* If there was any arguments from configuration file,

619

pass them to parser as command arguments */

513

620

514

if(custom_argv != NULL){

621

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

622

0, NULL);

515

custom_argv[0] = argv[0];

516

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

623

517

if (ret == ARGP_ERR_UNKNOWN){

624

518

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

625

519

exitstatus = EXIT_FAILURE;

627

521

}

628

522

}

629

523

630

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

631

config file */

632

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

633

if (ret == ARGP_ERR_UNKNOWN){

634

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

635

exitstatus = EXIT_FAILURE;

636

goto fallback;

637

}

638

639

524

if(debug){

640

525

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

641

526

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

650

535

}

651

536

}

652

537

653

/* Strip permissions down to nobody */

654

538

ret = setuid(uid);

655

539

if (ret == -1){

656

540

perror("setuid");

657

}

541

}

542

658

543

setgid(gid);

659

544

if (ret == -1){

660

545

perror("setgid");

661

546

}

662

547

663

if (plugindir == NULL){

664

dir = opendir(PDIR);

665

} else {

666

dir = opendir(plugindir);

667

}

668

548

dir = opendir(plugindir);

669

549

if(dir == NULL){

670

550

perror("Could not open plugin dir");

671

551

exitstatus = EXIT_FAILURE;

687

567

688

568

FD_ZERO(&rfds_all);

689

569

690

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

691

570

while(true){

692

571

dirst = readdir(dir);

693

572

694

/* All directory entries have been processed */

573

// All directory entries have been processed

695

574

if(dirst == NULL){

696

575

if (errno == EBADF){

697

576

perror("readdir");

703

582

704

583

d_name_len = strlen(dirst->d_name);

705

584

706

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

585

// Ignore dotfiles, backup files and other junk

707

586

{

708

587

bool bad_name = false;

709

588

724

603

break;

725

604

}

726

605

}

606

727

607

if(bad_name){

728

608

continue;

729

609

}

610

730

611

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

731

612

size_t suf_len = strlen(*suf);

732

613

if((d_name_len >= suf_len)

759

640

free(filename);

760

641

continue;

761

642

}

762

763

/* Ignore non-executable files */

643

764

644

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

765

645

if(debug){

766

646

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

769

649

free(filename);

770

650

continue;

771

651

}

772

773

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

652

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

774

653

if(p == NULL){

775

654

perror("getplugin");

776

655

free(filename);

786

665

}

787

666

{

788

667

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

789

plugin *g = getplugin(NULL);

668

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

790

669

if(g != NULL){

791

670

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

792

671

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

795

674

}

796

675

/* Add global environment variables */

797

676

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

798

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

677

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

799

678

perror("add_environment");

800

679

}

801

680

}

806

685

process, too. */

807

686

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

808

687

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

809

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)){

810

694

perror("add_environment");

811

695

}

812

696

}

819

703

exitstatus = EXIT_FAILURE;

820

704

goto fallback;

821

705

}

822

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

823

706

ret = set_cloexec_flag(pipefd[0]);

824

707

if(ret < 0){

825

708

perror("set_cloexec_flag");

839

722

exitstatus = EXIT_FAILURE;

840

723

goto fallback;

841

724

}

842

/* Starting a new process to be watched */

725

// Starting a new process to be watched

843

726

pid_t pid = fork();

844

727

if(pid == -1){

845

728

perror("fork");

883

766

}

884

767

/* no return */

885

768

}

886

/* Parent process */

887

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

769

/* parent process */

888

770

free(filename);

889

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

890

if (new_plugin == NULL){

891

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");

892

775

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

893

776

if(ret < 0){

894

perror("sigprocmask");

777

perror("sigprocmask");

895

778

}

896

779

exitstatus = EXIT_FAILURE;

897

780

goto fallback;

898

781

}

899

782

900

new_plugin->pid = pid;

901

new_plugin->fd = pipefd[0];

902

783

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

784

.fd = pipefd[0],

785

.next = process_list };

786

// List handling

787

process_list = new_process;

903

788

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

904

789

has already completed */

905

790

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

909

794

goto fallback;

910

795

}

911

796

912

FD_SET(new_plugin->fd, &rfds_all);

797

FD_SET(new_process->fd, &rfds_all);

913

798

914

if (maxfd < new_plugin->fd){

915

maxfd = new_plugin->fd;

799

if (maxfd < new_process->fd){

800

maxfd = new_process->fd;

916

801

}

917

802

918

803

}

919

804

805

free_plugin_list(plugin_list);

806

plugin_list = NULL;

807

920

808

closedir(dir);

921

809

dir = NULL;

922

923

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

924

if(p->pid != 0){

925

break;

926

}

927

if(p->next == NULL){

928

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

929

" directory?\n");

930

free_plugin_list();

931

}

810

811

if (process_list == NULL){

812

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

813

" directory?\n");

814

process_list = NULL;

932

815

}

933

934

/* Main loop while running plugins exist */

935

while(plugin_list){

816

while(process_list){

936

817

fd_set rfds = rfds_all;

937

818

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

938

819

if (select_ret == -1){

942

823

}

943

824

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

944

825

from one of them */

945

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

826

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

946

827

/* Is this process completely done? */

947

828

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

948

829

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

949

830

if(not WIFEXITED(proc->status)

950

831

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

951

832

/* Bad exit by plugin */

952

953

833

if(debug){

954

834

if(WIFEXITED(proc->status)){

955

835

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

964

844

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

965

845

}

966

846

}

967

968

847

/* Remove the plugin */

969

848

FD_CLR(proc->fd, &rfds_all);

970

971

849

/* Block signal while modifying process_list */

972

850

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

973

851

if(ret < 0){

975

853

exitstatus = EXIT_FAILURE;

976

854

goto fallback;

977

855

}

978

free_plugin(proc);

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

}

979

869

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

980

870

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,

981

871

NULL);

982

872

if(ret < 0){

983

873

perror("sigprocmask");

984

exitstatus = EXIT_FAILURE;

985

goto fallback;

986

}

987

988

if(plugin_list == NULL){

989

break;

990

}

991

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;

992

881

}

993

994

882

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

995

883

996

884

bool bret = print_out_password(proc->buffer,

1001

889

}

1002

890

goto fallback;

1003

891

}

1004

1005

892

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

1006

893

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

1007

894

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

1037

924

1038

925

fallback:

1039

926

1040

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

927

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

1041

928

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

1042

929

occured */

1043

930

bool bret;

1058

945

}

1059

946

1060

947

if(custom_argv != NULL){

1061

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

948

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

1062

949

free(*arg);

1063

950

}

1064

951

free(custom_argv);

1065

952

}

953

free_plugin_list(plugin_list);

1066

954

1067

955

if(dir != NULL){

1068

956

closedir(dir);

1069

957

}

1070

958

1071

959

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

1072

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

1073

if(p->pid != 0){

1074

close(p->fd);

1075

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

1076

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

1077

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

1078

perror("kill");

1079

}

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");

1080

967

}

968

free(process_list->buffer);

969

free(process_list);

1081

970

}

1082

971

1083

972

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

1087

976

if(errno != ECHILD){

1088

977

perror("wait");

1089

978

}

1090

1091

free_plugin_list();

1092

1093

free(plugindir);

1094

free(argfile);

1095

979

1096

980

return exitstatus;

1097

981

}