/mandos/release : revision 164

65

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

66

67

#define BUFFER_SIZE 256

68

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

68

69

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

70

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

69

71

70

72

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

71

73

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

72

74

73

struct process;

74

75

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*/

76

86

pid_t pid;

77

87

int fd;

78

88

char *buffer;

81

91

bool eof;

82

92

volatile bool completed;

83

93

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

98

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){

99

104

if ((p->name == name)

100

105

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

101

106

return p;

116

121

117

122

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

118

123

.argc = 1,

119

.envc = 0,

120

124

.disabled = false,

121

.next = *plugin_list };

125

.next = plugin_list };

122

126

123

127

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

124

128

if (new_plugin->argv == NULL){

128

132

}

129

133

new_plugin->argv[0] = copy_name;

130

134

new_plugin->argv[1] = NULL;

131

135

132

136

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

133

137

if(new_plugin->environ == NULL){

134

138

free(copy_name);

137

141

return NULL;

138

142

}

139

143

new_plugin->environ[0] = NULL;

144

140

145

/* Append the new plugin to the list */

141

*plugin_list = new_plugin;

146

plugin_list = new_plugin;

142

147

return new_plugin;

143

148

}

144

149

174

179

}

175

180

176

181

/* Add to a plugin's environment */

177

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

182

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

178

183

if(p == NULL){

179

184

return false;

180

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

}

181

203

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

182

204

}

183

205

184

185

206

/*

186

207

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

187

208

* Descriptor Flags".

198

219

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

199

220

}

200

221

201

process *process_list = NULL;

202

222

203

223

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

204

224

status. */

205

225

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

206

226

while(true){

207

process *proc = process_list;

227

plugin *proc = plugin_list;

208

228

int status;

209

229

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

210

230

if(pid == 0){

218

238

/* No child processes */

219

239

break;

220

240

}

221

241

222

242

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

223

243

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

224

244

proc = proc->next;

232

252

}

233

253

}

234

254

255

/* Prints out a password to stdout */

235

256

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

236

257

ssize_t ret;

237

258

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

247

268

return true;

248

269

}

249

270

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;

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

}

256

295

}

257

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

258

parsing */

259

argv[1] = NULL;

260

}

261

*argc += 1;

262

argv = realloc(argv, sizeof(char *)

263

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

264

if(argv == NULL){

265

return NULL;

266

}

267

argv[*argc-1] = arg;

268

argv[*argc] = NULL;

269

return argv;

296

}

297

298

free(plugin_node);

270

299

}

271

300

272

static void free_plugin_list(plugin *plugin_list){

273

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

274

next = plugin_list->next;

275

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

276

free(*arg);

277

}

278

free(plugin_list->argv);

279

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

280

free(*env);

281

}

282

free(plugin_list->environ);

283

free(plugin_list);

301

static void free_plugin_list(void){

302

while(plugin_list != NULL){

303

free_plugin(plugin_list);

284

304

}

285

305

}

286

306

287

307

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

288

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

289

const char *argfile = ARGFILE;

308

char *plugindir = NULL;

309

char *argfile = NULL;

290

310

FILE *conffp;

291

311

size_t d_name_len;

292

312

DIR *dir = NULL;

324

344

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

325

345

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

326

346

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

327

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

347

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

328

348

.arg = "VAR=value",

329

349

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

330

350

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

331

351

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

332

352

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

333

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

353

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

334

354

.arg = "PLUGIN:ENV=value",

335

355

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

336

356

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

337

357

.arg = "PLUGIN",

338

358

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

359

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

360

.arg = "PLUGIN",

361

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

339

362

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

340

363

.arg = "DIRECTORY",

341

364

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

342

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

343

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

344

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

345

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

346

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

347

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

348

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

349

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

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 },

350

376

{ .name = NULL }

351

377

};

352

378

353

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

354

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

355

pointer to our plugin list pointer. */

356

plugin **plugins = state->input;

379

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

380

struct argp_state *state) {

357

381

switch (key) {

358

case 'g':

382

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

359

383

if (arg != NULL){

360

384

char *p;

361

385

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

362

386

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

363

387

continue;

364

388

}

365

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

389

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

366

390

perror("add_argument");

367

391

return ARGP_ERR_UNKNOWN;

368

392

}

369

393

}

370

394

}

371

395

break;

372

case 'e':

396

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

373

397

if(arg == NULL){

374

398

break;

375

399

}

378

402

if(envdef == NULL){

379

403

break;

380

404

}

381

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

405

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

382

406

perror("add_environment");

383

407

}

384

408

}

385

409

break;

386

case 'o':

410

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

387

411

if (arg != NULL){

388

412

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

389

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

413

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

390

414

break;

391

415

}

392

416

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

393

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

417

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

394

418

break;

395

419

}

396

if(opt != NULL){

397

char *p;

398

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

399

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

400

continue;

401

}

402

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

403

perror("add_argument");

404

return ARGP_ERR_UNKNOWN;

405

}

420

char *p;

421

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

422

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

423

continue;

424

}

425

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

426

perror("add_argument");

427

return ARGP_ERR_UNKNOWN;

406

428

}

407

429

}

408

430

}

409

431

break;

410

case 'f':

432

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

411

433

if(arg == NULL){

412

434

break;

413

435

}

421

443

break;

422

444

}

423

445

envdef++;

424

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

446

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

425

447

perror("add_environment");

426

448

}

427

449

}

428

450

break;

429

case 'd':

451

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

430

452

if (arg != NULL){

431

plugin *p = getplugin(arg, plugins);

453

plugin *p = getplugin(arg);

432

454

if(p == NULL){

433

455

return ARGP_ERR_UNKNOWN;

434

456

}

435

457

p->disabled = true;

436

458

}

437

459

break;

438

case 128:

439

plugindir = arg;

440

break;

441

case 129:

460

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

461

if (arg != NULL){

462

plugin *p = getplugin(arg);

463

if(p == NULL){

464

return ARGP_ERR_UNKNOWN;

465

}

466

p->disabled = false;

467

}

468

break;

469

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

470

plugindir = strdup(arg);

471

if(plugindir == NULL){

472

perror("strdup");

473

}

474

break;

475

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

476

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

477

break;

478

case 130: /* --userid */

442

479

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

443

480

break;

444

case 130:

481

case 131: /* --groupid */

445

482

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

446

483

break;

447

case 131:

484

case 132: /* --debug */

448

485

debug = true;

449

486

break;

450

487

case ARGP_KEY_ARG:

458

495

return 0;

459

496

}

460

497

461

plugin *plugin_list = NULL;

498

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

499

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

500

error_t parse_opt_config_file (int key, char *arg,

501

__attribute__((unused))

502

struct argp_state *state) {

503

switch (key) {

504

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

505

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

506

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

507

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

508

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

509

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

510

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

511

break;

512

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

513

argfile = strdup(arg);

514

if(argfile == NULL){

515

perror("strdup");

516

}

517

break;

518

case 130: /* --userid */

519

case 131: /* --groupid */

520

case 132: /* --debug */

521

case ARGP_KEY_ARG:

522

case ARGP_KEY_END:

523

break;

524

default:

525

return ARGP_ERR_UNKNOWN;

526

}

527

return 0;

528

}

462

529

463

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

464

.args_doc = "[+PLUS_SEPARATED_OPTIONS]",

530

struct argp argp = { .options = options,

531

.parser = parse_opt_config_file,

532

.args_doc = "",

465

533

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

466

534

467

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

535

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

536

config file location, if any. */

537

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

468

538

if (ret == ARGP_ERR_UNKNOWN){

469

539

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

470

540

exitstatus = EXIT_FAILURE;

471

541

goto fallback;

472

542

}

473

474

conffp = fopen(argfile, "r");

543

544

/* Reset to the normal argument parser */

545

argp.parser = parse_opt;

546

547

/* Open the configfile if available */

548

if (argfile == NULL){

549

conffp = fopen(AFILE, "r");

550

} else {

551

conffp = fopen(argfile, "r");

552

}

475

553

if(conffp != NULL){

476

554

char *org_line = NULL;

477

555

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

480

558

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

481

559

const char comment_delim[] = "#";

482

560

561

custom_argc = 1;

562

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

563

if(custom_argv == NULL){

564

perror("malloc");

565

exitstatus = EXIT_FAILURE;

566

goto fallback;

567

}

568

custom_argv[0] = argv[0];

569

custom_argv[1] = NULL;

570

571

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

572

commented text */

483

573

while(true){

484

574

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

485

575

if(sret == -1){

493

583

continue;

494

584

}

495

585

new_arg = strdup(p);

496

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

497

if (custom_argv == NULL){

498

perror("add_to_argv");

499

exitstatus = EXIT_FAILURE;

500

goto fallback;

501

}

586

if(new_arg == NULL){

587

perror("strdup");

588

exitstatus = EXIT_FAILURE;

589

free(org_line);

590

goto fallback;

591

}

592

593

custom_argc += 1;

594

custom_argv = realloc(custom_argv, sizeof(char *)

595

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

596

if(custom_argv == NULL){

597

perror("realloc");

598

exitstatus = EXIT_FAILURE;

599

free(org_line);

600

goto fallback;

601

}

602

custom_argv[custom_argc-1] = new_arg;

603

custom_argv[custom_argc] = NULL;

502

604

}

503

605

}

504

606

free(org_line);

505

} else{

607

} else {

506

608

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

507

609

not affect opening plugins */

508

610

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

511

613

goto fallback;

512

614

}

513

615

}

514

616

/* If there was any arguments from configuration file,

617

pass them to parser as command arguments */

515

618

if(custom_argv != NULL){

516

custom_argv[0] = argv[0];

517

ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0,

518

&plugin_list);

619

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

620

0, NULL);

519

621

if (ret == ARGP_ERR_UNKNOWN){

520

622

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

521

623

exitstatus = EXIT_FAILURE;

523

625

}

524

626

}

525

627

628

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

629

config file */

630

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

631

if (ret == ARGP_ERR_UNKNOWN){

632

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

633

exitstatus = EXIT_FAILURE;

634

goto fallback;

635

}

636

526

637

if(debug){

527

638

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

528

639

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

537

648

}

538

649

}

539

650

651

/* Strip permissions down to nobody */

540

652

ret = setuid(uid);

541

653

if (ret == -1){

542

654

perror("setuid");

543

}

544

655

}

545

656

setgid(gid);

546

657

if (ret == -1){

547

658

perror("setgid");

548

659

}

549

660

550

dir = opendir(plugindir);

661

if (plugindir == NULL){

662

dir = opendir(PDIR);

663

} else {

664

dir = opendir(plugindir);

665

}

666

551

667

if(dir == NULL){

552

668

perror("Could not open plugin dir");

553

669

exitstatus = EXIT_FAILURE;

569

685

570

686

FD_ZERO(&rfds_all);

571

687

688

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

572

689

while(true){

573

690

dirst = readdir(dir);

574

691

575

// All directory entries have been processed

692

/* All directory entries have been processed */

576

693

if(dirst == NULL){

577

694

if (errno == EBADF){

578

695

perror("readdir");

584

701

585

702

d_name_len = strlen(dirst->d_name);

586

703

587

// Ignore dotfiles, backup files and other junk

704

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

588

705

{

589

706

bool bad_name = false;

590

707

605

722

break;

606

723

}

607

724

}

608

609

725

if(bad_name){

610

726

continue;

611

727

}

612

613

728

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

614

729

size_t suf_len = strlen(*suf);

615

730

if((d_name_len >= suf_len)

642

757

free(filename);

643

758

continue;

644

759

}

645

760

761

/* Ignore non-executable files */

646

762

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

647

763

if(debug){

648

764

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

651

767

free(filename);

652

768

continue;

653

769

}

654

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

770

771

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

655

772

if(p == NULL){

656

773

perror("getplugin");

657

774

free(filename);

667

784

}

668

785

{

669

786

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

670

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

787

plugin *g = getplugin(NULL);

671

788

if(g != NULL){

672

789

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

673

790

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

676

793

}

677

794

/* Add global environment variables */

678

795

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

679

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

796

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

680

797

perror("add_environment");

681

798

}

682

799

}

687

804

process, too. */

688

805

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

689

806

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

690

char *copy = strdup(*e);

691

if(copy == NULL){

692

perror("strdup");

693

continue;

694

}

695

if(not add_environment(p, copy)){

807

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

696

808

perror("add_environment");

697

809

}

698

810

}

705

817

exitstatus = EXIT_FAILURE;

706

818

goto fallback;

707

819

}

820

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

708

821

ret = set_cloexec_flag(pipefd[0]);

709

822

if(ret < 0){

710

823

perror("set_cloexec_flag");

724

837

exitstatus = EXIT_FAILURE;

725

838

goto fallback;

726

839

}

727

// Starting a new process to be watched

840

/* Starting a new process to be watched */

728

841

pid_t pid = fork();

729

842

if(pid == -1){

730

843

perror("fork");

768

881

}

769

882

/* no return */

770

883

}

771

/* parent process */

884

/* Parent process */

885

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

772

886

free(filename);

773

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

774

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

775

if (new_process == NULL){

776

perror("malloc");

887

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

888

if (new_plugin == NULL){

889

perror("getplugin");

777

890

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

778

891

if(ret < 0){

779

perror("sigprocmask");

892

perror("sigprocmask");

780

893

}

781

894

exitstatus = EXIT_FAILURE;

782

895

goto fallback;

783

896

}

784

897

785

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

786

.fd = pipefd[0],

787

.next = process_list };

788

// List handling

789

process_list = new_process;

898

new_plugin->pid = pid;

899

new_plugin->fd = pipefd[0];

900

790

901

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

791

902

has already completed */

792

903

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

796

907

goto fallback;

797

908

}

798

909

799

FD_SET(new_process->fd, &rfds_all);

910

FD_SET(new_plugin->fd, &rfds_all);

800

911

801

if (maxfd < new_process->fd){

802

maxfd = new_process->fd;

912

if (maxfd < new_plugin->fd){

913

maxfd = new_plugin->fd;

803

914

}

804

915

805

916

}

806

917

807

free_plugin_list(plugin_list);

808

plugin_list = NULL;

809

810

918

closedir(dir);

811

919

dir = NULL;

812

813

if (process_list == NULL){

814

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

815

" directory?\n");

816

process_list = NULL;

920

921

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

922

if(p->pid != 0){

923

break;

924

}

925

if(p->next == NULL){

926

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

927

" directory?\n");

928

free_plugin_list();

929

}

817

930

}

818

while(process_list){

931

932

/* Main loop while running plugins exist */

933

while(plugin_list){

819

934

fd_set rfds = rfds_all;

820

935

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

821

936

if (select_ret == -1){

825

940

}

826

941

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

827

942

from one of them */

828

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

943

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

829

944

/* Is this process completely done? */

830

945

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

831

946

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

832

947

if(not WIFEXITED(proc->status)

833

948

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

834

949

/* Bad exit by plugin */

950

835

951

if(debug){

836

952

if(WIFEXITED(proc->status)){

837

953

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

846

962

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

847

963

}

848

964

}

965

849

966

/* Remove the plugin */

850

967

FD_CLR(proc->fd, &rfds_all);

968

851

969

/* Block signal while modifying process_list */

852

970

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

853

971

if(ret < 0){

855

973

exitstatus = EXIT_FAILURE;

856

974

goto fallback;

857

975

}

858

/* Delete this process entry from the list */

859

if(process_list == proc){

860

/* First one - simple */

861

process_list = proc->next;

862

} else {

863

/* Second one or later */

864

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

865

if(p->next == proc){

866

p->next = proc->next;

867

break;

868

}

869

}

870

}

976

free_plugin(proc);

871

977

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

872

978

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,

873

979

NULL);

874

980

if(ret < 0){

875

981

perror("sigprocmask");

876

}

877

free(proc->buffer);

878

free(proc);

879

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

880

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

881

the process list */

882

break;

982

exitstatus = EXIT_FAILURE;

983

goto fallback;

984

}

985

986

if(plugin_list == NULL){

987

break;

988

}

989

continue;

883

990

}

991

884

992

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

885

993

886

994

bool bret = print_out_password(proc->buffer,

891

999

}

892

1000

goto fallback;

893

1001

}

1002

894

1003

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

895

1004

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

896

1005

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

926

1035

927

1036

fallback:

928

1037

929

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

1038

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

930

1039

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

931

1040

occured */

932

1041

bool bret;

947

1056

}

948

1057

949

1058

if(custom_argv != NULL){

950

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

1059

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

951

1060

free(*arg);

952

1061

}

953

1062

free(custom_argv);

954

1063

}

955

free_plugin_list(plugin_list);

956

1064

957

1065

if(dir != NULL){

958

1066

closedir(dir);

959

1067

}

960

1068

961

1069

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

962

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

963

next = process_list->next;

964

close(process_list->fd);

965

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

966

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

967

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

968

perror("kill");

1070

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

1071

if(p->pid != 0){

1072

close(p->fd);

1073

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

1074

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

1075

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

1076

perror("kill");

1077

}

969

1078

}

970

free(process_list->buffer);

971

free(process_list);

972

1079

}

973

1080

974

1081

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

978

1085

if(errno != ECHILD){

979

1086

perror("wait");

980

1087

}

1088

1089

free_plugin_list();

1090

1091

free(plugindir);

1092

free(argfile);

981

1093

982

1094

return exitstatus;

983

1095

}