/mandos/trunk : revision 145

1

/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */

1

/* -*- coding: utf-8 -*- */

2

/*

3

* Mandos plugin runner - Run Mandos plugins

4

*

5

6

5

7

6

*

8

7

* This program is free software: you can redistribute it and/or

9

8

* modify it under the terms of the GNU General Public License as

28

27

#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,

29

28

EXIT_SUCCESS, realloc() */

30

29

#include <stdbool.h> /* bool, true, false */

31

#include <stdio.h> /* perror, fileno(), fprintf(),

32

stderr, STDOUT_FILENO */

30

#include <stdio.h> /* perror, popen(), fileno(),

31

fprintf(), stderr, STDOUT_FILENO */

33

32

#include <sys/types.h> /* DIR, opendir(), stat(), struct

34

33

stat, waitpid(), WIFEXITED(),

35

34

WEXITSTATUS(), wait(), pid_t,

38

37

#include <sys/select.h> /* fd_set, select(), FD_ZERO(),

39

38

FD_SET(), FD_ISSET(), FD_CLR */

40

39

#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),

41

WEXITSTATUS(), WTERMSIG(),

42

WCOREDUMP() */

40

WEXITSTATUS() */

43

41

#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */

44

42

#include <iso646.h> /* and, or, not */

45

43

#include <dirent.h> /* DIR, struct dirent, opendir(),

48

46

fcntl(), setuid(), setgid(),

49

47

F_GETFD, F_SETFD, FD_CLOEXEC,

50

48

access(), pipe(), fork(), close()

51

dup2(), STDOUT_FILENO, _exit(),

49

dup2, STDOUT_FILENO, _exit(),

52

50

execv(), write(), read(),

53

51

close() */

54

52

#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,

55

53

FD_CLOEXEC */

56

#include <string.h> /* strsep, strlen(), asprintf(),

57

strsignal() */

54

#include <string.h> /* strsep, strlen(), asprintf() */

58

55

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

59

56

#include <argp.h> /* struct argp_option, struct

60

57

argp_state, struct argp,

64

61

#include <signal.h> /* struct sigaction, sigemptyset(),

65

62

sigaddset(), sigaction(),

66

63

sigprocmask(), SIG_BLOCK, SIGCHLD,

67

SIG_UNBLOCK, kill(), sig_atomic_t

68

*/

64

SIG_UNBLOCK, kill() */

69

65

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

70

#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */

71

66

72

67

#define BUFFER_SIZE 256

73

68

74

69

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

75

70

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

76

71

77

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

72

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

78

73

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

79

74

75

struct plugin;

76

80

77

typedef struct plugin{

81

78

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

82

79

char **argv;

84

81

char **environ;

85

82

int envc;

86

83

bool disabled;

87

84

88

85

/* Variables used for running processes*/

89

86

pid_t pid;

90

87

int fd;

92

89

size_t buffer_size;

93

90

size_t buffer_length;

94

91

bool eof;

95

volatile sig_atomic_t completed;

96

int status;

92

volatile bool completed;

93

volatile int status;

97

94

struct plugin *next;

98

95

} plugin;

99

96

100

97

static plugin *plugin_list = NULL;

101

98

102

/* Gets an existing plugin based on name,

99

/* Gets a existing plugin based on name,

103

100

or if none is found, creates a new one */

104

101

static plugin *getplugin(char *name){

105

102

/* Check for exiting plugin with that name */

106

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

107

if((p->name == name)

108

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

103

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

104

if ((p->name == name)

105

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

109

106

return p;

110

107

}

111

108

}

112

109

/* Create a new plugin */

113

plugin *new_plugin = NULL;

114

do {

115

new_plugin = malloc(sizeof(plugin));

116

} while(new_plugin == NULL and errno == EINTR);

117

if(new_plugin == NULL){

110

plugin *new_plugin = malloc(sizeof(plugin));

111

if (new_plugin == NULL){

118

112

return NULL;

119

113

}

120

114

char *copy_name = NULL;

121

115

if(name != NULL){

122

do {

123

copy_name = strdup(name);

124

} while(copy_name == NULL and errno == EINTR);

116

copy_name = strdup(name);

125

117

if(copy_name == NULL){

126

free(new_plugin);

127

118

return NULL;

128

119

}

129

120

}

130

131

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

132

.argc = 1,

133

.disabled = false,

134

.next = plugin_list };

135

136

do {

137

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

138

} while(new_plugin->argv == NULL and errno == EINTR);

139

if(new_plugin->argv == NULL){

121

122

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

123

.argc = 1,

124

.disabled = false,

125

.next = plugin_list };

126

127

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

128

if (new_plugin->argv == NULL){

140

129

free(copy_name);

141

130

free(new_plugin);

142

131

return NULL;

144

133

new_plugin->argv[0] = copy_name;

145

134

new_plugin->argv[1] = NULL;

146

135

147

do {

148

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

149

} while(new_plugin->environ == NULL and errno == EINTR);

136

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

150

137

if(new_plugin->environ == NULL){

151

138

free(copy_name);

152

139

free(new_plugin->argv);

164

151

static bool add_to_char_array(const char *new, char ***array,

165

152

int *len){

166

153

/* Resize the pointed-to array to hold one more pointer */

167

do {

168

*array = realloc(*array, sizeof(char *)

169

* (size_t) ((*len) + 2));

170

} while(*array == NULL and errno == EINTR);

154

*array = realloc(*array, sizeof(char *)

155

* (size_t) ((*len) + 2));

171

156

/* Malloc check */

172

157

if(*array == NULL){

173

158

return false;

174

159

}

175

160

/* Make a copy of the new string */

176

char *copy;

177

do {

178

copy = strdup(new);

179

} while(copy == NULL and errno == EINTR);

161

char *copy = strdup(new);

180

162

if(copy == NULL){

181

163

return false;

182

164

}

205

187

size_t namelen = (size_t)(strchrnul(def, '=') - def);

206

188

/* Search for this environment variable */

207

189

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

208

if(strncmp(*e, def, namelen + 1) == 0){

190

if(strncmp(*e, def, namelen+1) == 0){

209

191

/* It already exists */

210

192

if(replace){

211

char *new;

212

do {

213

new = realloc(*e, strlen(def) + 1);

214

} while(new == NULL and errno == EINTR);

193

char *new = realloc(*e, strlen(def));

215

194

if(new == NULL){

216

195

return false;

217

196

}

227

206

/*

228

207

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

229

208

* Descriptor Flags".

230

| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |

209

* *Note File Descriptor Flags:(libc)Descriptor Flags.

231

210

*/

232

static int set_cloexec_flag(int fd){

233

int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));

211

static int set_cloexec_flag(int fd)

212

{

213

int ret = fcntl(fd, F_GETFD, 0);

234

214

/* If reading the flags failed, return error indication now. */

235

215

if(ret < 0){

236

216

return ret;

237

217

}

238

218

/* Store modified flag word in the descriptor. */

239

return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,

240

ret | FD_CLOEXEC));

219

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

241

220

}

242

221

243

222

244

223

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

245

224

status. */

246

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

247

int old_errno = errno;

225

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

248

226

while(true){

249

227

plugin *proc = plugin_list;

250

228

int status;

254

232

break;

255

233

}

256

234

if(pid == -1){

257

if(errno == ECHILD){

258

/* No child processes */

259

break;

235

if (errno != ECHILD){

236

perror("waitpid");

260

237

}

261

perror("waitpid");

238

/* No child processes */

239

break;

262

240

}

263

241

264

242

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

265

243

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

266

244

proc = proc->next;

270

248

continue;

271

249

}

272

250

proc->status = status;

273

proc->completed = 1;

251

proc->completed = true;

274

252

}

275

errno = old_errno;

276

253

}

277

254

278

255

/* Prints out a password to stdout */

279

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

256

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

280

257

ssize_t ret;

258

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

259

length--;

260

}

281

261

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

282

262

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

283

263

length - written));

300

280

}

301

281

free(plugin_node->environ);

302

282

free(plugin_node->buffer);

303

283

304

284

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

305

285

if(plugin_node == plugin_list){

306

286

/* First one - simple */

334

314

struct stat st;

335

315

fd_set rfds_all;

336

316

int ret, maxfd = 0;

337

ssize_t sret;

338

317

uid_t uid = 65534;

339

318

gid_t gid = 65534;

340

319

bool debug = false;

397

376

{ .name = NULL }

398

377

};

399

378

400

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

401

struct argp_state *state){

402

switch(key){

403

char *tmp;

404

intmax_t tmpmax;

379

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

380

struct argp_state *state) {

381

switch (key) {

405

382

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

406

if(arg != NULL){

407

char *plugin_option;

408

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

409

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

383

if (arg != NULL){

384

char *p;

385

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

386

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

410

387

continue;

411

388

}

412

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

389

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

413

390

perror("add_argument");

414

391

return ARGP_ERR_UNKNOWN;

415

392

}

420

397

if(arg == NULL){

421

398

break;

422

399

}

423

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

424

perror("add_environment");

400

{

401

char *envdef = strdup(arg);

402

if(envdef == NULL){

403

break;

404

}

405

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

406

perror("add_environment");

407

}

425

408

}

426

409

break;

427

410

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

428

if(arg != NULL){

429

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

430

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

431

break;

432

}

433

char *plugin_option;

434

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

435

if(not add_argument(getplugin(plugin_name), plugin_option)){

436

perror("add_argument");

437

return ARGP_ERR_UNKNOWN;

411

if (arg != NULL){

412

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

413

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

414

break;

415

}

416

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

417

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

418

break;

419

}

420

if(opt != NULL){

421

char *p;

422

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

423

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

424

continue;

425

}

426

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

427

perror("add_argument");

428

return ARGP_ERR_UNKNOWN;

429

}

438

430

}

439

431

}

440

432

}

448

440

if(envdef == NULL){

449

441

break;

450

442

}

451

*envdef = '\0';

452

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

443

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

444

if(p_name == NULL){

445

break;

446

}

447

envdef++;

448

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

453

449

perror("add_environment");

454

450

}

455

451

}

456

452

break;

457

453

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

458

if(arg != NULL){

454

if (arg != NULL){

459

455

plugin *p = getplugin(arg);

460

456

if(p == NULL){

461

457

return ARGP_ERR_UNKNOWN;

464

460

}

465

461

break;

466

462

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

467

if(arg != NULL){

463

if (arg != NULL){

468

464

plugin *p = getplugin(arg);

469

465

if(p == NULL){

470

466

return ARGP_ERR_UNKNOWN;

473

469

}

474

470

break;

475

471

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

476

free(plugindir);

477

472

plugindir = strdup(arg);

478

473

if(plugindir == NULL){

479

474

perror("strdup");

480

}

475

}

481

476

break;

482

477

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

483

478

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

484

479

break;

485

480

case 130: /* --userid */

486

errno = 0;

487

tmpmax = strtoimax(arg, &tmp, 10);

488

if(errno != 0 or tmp == arg or *tmp != '\0'

489

or tmpmax != (uid_t)tmpmax){

490

fprintf(stderr, "Bad user ID number: \"%s\", using %"

491

PRIdMAX "\n", arg, (intmax_t)uid);

492

} else {

493

uid = (uid_t)tmpmax;

494

}

481

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

495

482

break;

496

483

case 131: /* --groupid */

497

errno = 0;

498

tmpmax = strtoimax(arg, &tmp, 10);

499

if(errno != 0 or tmp == arg or *tmp != '\0'

500

or tmpmax != (gid_t)tmpmax){

501

fprintf(stderr, "Bad group ID number: \"%s\", using %"

502

PRIdMAX "\n", arg, (intmax_t)gid);

503

} else {

504

gid = (gid_t)tmpmax;

505

}

484

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

506

485

break;

507

486

case 132: /* --debug */

508

487

debug = true;

509

488

break;

510

/*

511

* When adding more options before this line, remember to also add a

512

* "case" to the "parse_opt_config_file" function below.

513

*/

514

489

case ARGP_KEY_ARG:

515

/* Cryptsetup always passes an argument, which is an empty

516

string if "none" was specified in /etc/crypttab. So if

517

argument was empty, we ignore it silently. */

518

if(arg[0] != '\0'){

519

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

520

}

490

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

521

491

break;

522

492

case ARGP_KEY_END:

523

493

break;

529

499

530

500

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

531

501

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

532

error_t parse_opt_config_file(int key, char *arg,

533

__attribute__((unused))

534

struct argp_state *state){

535

switch(key){

502

error_t parse_opt_config_file (int key, char *arg,

503

__attribute__((unused))

504

struct argp_state *state) {

505

switch (key) {

536

506

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

537

507

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

538

508

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

542

512

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

543

513

break;

544

514

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

545

free(argfile);

546

515

argfile = strdup(arg);

547

516

if(argfile == NULL){

548

517

perror("strdup");

549

518

}

550

break;

519

break;

551

520

case 130: /* --userid */

552

521

case 131: /* --groupid */

553

522

case 132: /* --debug */

565

534

.args_doc = "",

566

535

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

567

536

568

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

537

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

569

538

config file location, if any. */

570

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

571

if(ret == ARGP_ERR_UNKNOWN){

539

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

540

if (ret == ARGP_ERR_UNKNOWN){

572

541

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

573

542

exitstatus = EXIT_FAILURE;

574

543

goto fallback;

578

547

argp.parser = parse_opt;

579

548

580

549

/* Open the configfile if available */

581

if(argfile == NULL){

550

if (argfile == NULL){

582

551

conffp = fopen(AFILE, "r");

583

552

} else {

584

553

conffp = fopen(argfile, "r");

585

}

554

}

586

555

if(conffp != NULL){

587

556

char *org_line = NULL;

588

557

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

589

558

size_t size = 0;

559

ssize_t sret;

590

560

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

591

561

const char comment_delim[] = "#";

592

562

593

563

custom_argc = 1;

594

564

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

595

565

if(custom_argv == NULL){

599

569

}

600

570

custom_argv[0] = argv[0];

601

571

custom_argv[1] = NULL;

602

572

603

573

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

604

574

commented text */

605

575

while(true){

607

577

if(sret == -1){

608

578

break;

609

579

}

610

580

611

581

line = org_line;

612

582

arg = strsep(&line, comment_delim);

613

583

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

632

602

goto fallback;

633

603

}

634

604

custom_argv[custom_argc-1] = new_arg;

635

custom_argv[custom_argc] = NULL;

605

custom_argv[custom_argc] = NULL;

636

606

}

637

607

}

638

do {

639

ret = fclose(conffp);

640

} while(ret == EOF and errno == EINTR);

641

if(ret == EOF){

642

perror("fclose");

643

exitstatus = EXIT_FAILURE;

644

goto fallback;

645

}

646

608

free(org_line);

647

609

} else {

648

610

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

649

611

not affect opening plugins */

650

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

612

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

651

613

perror("fopen");

652

614

exitstatus = EXIT_FAILURE;

653

615

goto fallback;

656

618

/* If there was any arguments from configuration file,

657

619

pass them to parser as command arguments */

658

620

if(custom_argv != NULL){

659

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

660

0, NULL);

661

if(ret == ARGP_ERR_UNKNOWN){

621

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

622

0, NULL);

623

if (ret == ARGP_ERR_UNKNOWN){

662

624

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

663

625

exitstatus = EXIT_FAILURE;

664

626

goto fallback;

667

629

668

630

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

669

631

config file */

670

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

671

if(ret == ARGP_ERR_UNKNOWN){

632

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

633

if (ret == ARGP_ERR_UNKNOWN){

672

634

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

673

635

exitstatus = EXIT_FAILURE;

674

636

goto fallback;

681

643

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

682

644

fprintf(stderr, "\tArg: %s\n", *a);

683

645

}

684

fprintf(stderr, "...and %d environment variables\n", p->envc);

646

fprintf(stderr, "...and %u environment variables\n", p->envc);

685

647

for(char **a = p->environ; *a != NULL; a++){

686

648

fprintf(stderr, "\t%s\n", *a);

687

649

}

689

651

}

690

652

691

653

/* Strip permissions down to nobody */

654

ret = setuid(uid);

655

if (ret == -1){

656

perror("setuid");

657

}

692

658

setgid(gid);

693

if(ret == -1){

659

if (ret == -1){

694

660

perror("setgid");

695

661

}

696

ret = setuid(uid);

697

if(ret == -1){

698

perror("setuid");

699

}

700

662

701

if(plugindir == NULL){

663

if (plugindir == NULL){

702

664

dir = opendir(PDIR);

703

665

} else {

704

666

dir = opendir(plugindir);

727

689

728

690

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

729

691

while(true){

730

do {

731

dirst = readdir(dir);

732

} while(dirst == NULL and errno == EINTR);

692

dirst = readdir(dir);

733

693

734

694

/* All directory entries have been processed */

735

695

if(dirst == NULL){

736

if(errno == EBADF){

696

if (errno == EBADF){

737

697

perror("readdir");

738

698

exitstatus = EXIT_FAILURE;

739

699

goto fallback;

751

711

752

712

const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",

753

713

".dpkg-old",

754

".dpkg-bak",

755

714

".dpkg-divert", NULL };

756

715

for(const char **pre = bad_prefixes; *pre != NULL; pre++){

757

716

size_t pre_len = strlen(*pre);

786

745

continue;

787

746

}

788

747

}

789

748

790

749

char *filename;

791

if(plugindir == NULL){

792

ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",

793

dirst->d_name));

794

} else {

795

ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",

796

plugindir,

797

dirst->d_name));

798

}

750

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

799

751

if(ret < 0){

800

752

perror("asprintf");

801

753

continue;

802

754

}

803

755

804

ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));

805

if(ret == -1){

756

ret = stat(filename, &st);

757

if (ret == -1){

806

758

perror("stat");

807

759

free(filename);

808

760

continue;

809

761

}

810

762

811

763

/* Ignore non-executable files */

812

if(not S_ISREG(st.st_mode)

813

or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){

764

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

814

765

if(debug){

815

766

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

816

767

" with bad type or mode\n", filename);

862

813

}

863

814

864

815

int pipefd[2];

865

ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));

866

if(ret == -1){

816

ret = pipe(pipefd);

817

if (ret == -1){

867

818

perror("pipe");

868

819

exitstatus = EXIT_FAILURE;

869

820

goto fallback;

882

833

goto fallback;

883

834

}

884

835

/* Block SIGCHLD until process is safely in process list */

885

ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,

886

&sigchld_action.sa_mask,

887

NULL));

836

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

888

837

if(ret < 0){

889

838

perror("sigprocmask");

890

839

exitstatus = EXIT_FAILURE;

891

840

goto fallback;

892

841

}

893

842

/* Starting a new process to be watched */

894

pid_t pid;

895

do {

896

pid = fork();

897

} while(pid == -1 and errno == EINTR);

843

pid_t pid = fork();

898

844

if(pid == -1){

899

845

perror("fork");

900

846

exitstatus = EXIT_FAILURE;

907

853

perror("sigaction");

908

854

_exit(EXIT_FAILURE);

909

855

}

910

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

856

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

911

857

if(ret < 0){

912

858

perror("sigprocmask");

913

859

_exit(EXIT_FAILURE);

914

860

}

915

861

916

862

ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */

917

863

if(ret == -1){

918

864

perror("dup2");

938

884

/* no return */

939

885

}

940

886

/* Parent process */

941

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

942

pipe */

887

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

943

888

free(filename);

944

889

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

945

if(new_plugin == NULL){

890

if (new_plugin == NULL){

946

891

perror("getplugin");

947

ret = (int)(TEMP_FAILURE_RETRY

948

(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,

949

NULL)));

892

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

950

893

if(ret < 0){

951

894

perror("sigprocmask");

952

895

}

959

902

960

903

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

961

904

has already completed */

962

ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,

963

&sigchld_action.sa_mask,

964

NULL));

905

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

965

906

if(ret < 0){

966

907

perror("sigprocmask");

967

908

exitstatus = EXIT_FAILURE;

970

911

971

912

FD_SET(new_plugin->fd, &rfds_all);

972

913

973

if(maxfd < new_plugin->fd){

914

if (maxfd < new_plugin->fd){

974

915

maxfd = new_plugin->fd;

975

916

}

917

976

918

}

977

919

978

TEMP_FAILURE_RETRY(closedir(dir));

920

closedir(dir);

979

921

dir = NULL;

980

free_plugin(getplugin(NULL));

981

922

982

923

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

983

924

if(p->pid != 0){

984

925

break;

989

930

free_plugin_list();

990

931

}

991

932

}

992

933

993

934

/* Main loop while running plugins exist */

994

935

while(plugin_list){

995

936

fd_set rfds = rfds_all;

996

937

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

997

if(select_ret == -1 and errno != EINTR){

938

if (select_ret == -1){

998

939

perror("select");

999

940

exitstatus = EXIT_FAILURE;

1000

941

goto fallback;

1001

942

}

1002

943

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

1003

944

from one of them */

1004

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

945

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

1005

946

/* Is this process completely done? */

1006

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

947

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

1007

948

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

1008

949

if(not WIFEXITED(proc->status)

1009

950

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

1010

951

/* Bad exit by plugin */

1011

952

1012

953

if(debug){

1013

954

if(WIFEXITED(proc->status)){

1014

fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"

1015

" status %d\n", proc->name,

1016

(intmax_t) (proc->pid),

955

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

956

(unsigned int) (proc->pid),

1017

957

WEXITSTATUS(proc->status));

1018

} else if(WIFSIGNALED(proc->status)){

1019

fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"

1020

" signal %d: %s\n", proc->name,

1021

(intmax_t) (proc->pid),

1022

WTERMSIG(proc->status),

1023

strsignal(WTERMSIG(proc->status)));

958

} else if(WIFSIGNALED(proc->status)) {

959

fprintf(stderr, "Plugin %u killed by signal %d\n",

960

(unsigned int) (proc->pid),

961

WTERMSIG(proc->status));

1024

962

} else if(WCOREDUMP(proc->status)){

1025

fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"

1026

" core\n", proc->name, (intmax_t) (proc->pid));

963

fprintf(stderr, "Plugin %d dumped core\n",

964

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

1027

965

}

1028

966

}

1029

967

1030

968

/* Remove the plugin */

1031

969

FD_CLR(proc->fd, &rfds_all);

1032

970

1033

971

/* Block signal while modifying process_list */

1034

ret = (int)TEMP_FAILURE_RETRY(sigprocmask

1035

(SIG_BLOCK,

1036

&sigchld_action.sa_mask,

1037

NULL));

972

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

1038

973

if(ret < 0){

1039

974

perror("sigprocmask");

1040

975

exitstatus = EXIT_FAILURE;

1041

976

goto fallback;

1042

977

}

1043

1044

plugin *next_plugin = proc->next;

1045

978

free_plugin(proc);

1046

proc = next_plugin;

1047

1048

979

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

1049

ret = (int)(TEMP_FAILURE_RETRY

1050

(sigprocmask(SIG_UNBLOCK,

1051

&sigchld_action.sa_mask, NULL)));

980

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,

981

NULL);

1052

982

if(ret < 0){

1053

983

perror("sigprocmask");

1054

984

exitstatus = EXIT_FAILURE;

1058

988

if(plugin_list == NULL){

1059

989

break;

1060

990

}

1061

1062

991

continue;

1063

992

}

1064

993

1065

994

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

1066

995

1067

996

bool bret = print_out_password(proc->buffer,

1068

997

proc->buffer_length);

1069

998

if(not bret){

1076

1005

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

1077

1006

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

1078

1007

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

1079

proc = proc->next;

1080

1008

continue;

1081

1009

}

1082

1010

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

1083

1011

if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){

1084

1012

proc->buffer = realloc(proc->buffer, proc->buffer_size

1085

1013

+ (size_t) BUFFER_SIZE);

1086

if(proc->buffer == NULL){

1014

if (proc->buffer == NULL){

1087

1015

perror("malloc");

1088

1016

exitstatus = EXIT_FAILURE;

1089

1017

goto fallback;

1091

1019

proc->buffer_size += BUFFER_SIZE;

1092

1020

}

1093

1021

/* Read from the process */

1094

sret = TEMP_FAILURE_RETRY(read(proc->fd,

1095

proc->buffer

1096

+ proc->buffer_length,

1097

BUFFER_SIZE));

1098

if(sret < 0){

1022

ret = read(proc->fd, proc->buffer + proc->buffer_length,

1023

BUFFER_SIZE);

1024

if(ret < 0){

1099

1025

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

1100

proc = proc->next;

1101

1026

continue;

1102

1027

}

1103

if(sret == 0){

1028

if(ret == 0){

1104

1029

/* got EOF */

1105

1030

proc->eof = true;

1106

1031

} else {

1107

proc->buffer_length += (size_t) sret;

1032

proc->buffer_length += (size_t) ret;

1108

1033

}

1109

1034

}

1110

1035

}

1111

1112

1036

1037

1113

1038

fallback:

1114

1039

1115

1040

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

1118

1043

bool bret;

1119

1044

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

1120

1045

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

1121

size_t len = strlen(passwordbuffer);

1122

/* Strip trailing newline */

1123

if(len > 0 and passwordbuffer[len-1] == '\n'){

1124

passwordbuffer[len-1] = '\0'; /* not strictly necessary */

1125

len--;

1126

}

1127

bret = print_out_password(passwordbuffer, len);

1046

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

1128

1047

if(not bret){

1129

1048

perror("print_out_password");

1130

1049

exitstatus = EXIT_FAILURE;

1137

1056

perror("sigaction");

1138

1057

exitstatus = EXIT_FAILURE;

1139

1058

}

1140

1059

1141

1060

if(custom_argv != NULL){

1142

1061

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

1143

1062

free(*arg);

1149

1068

closedir(dir);

1150

1069

}

1151

1070

1152

/* Kill the processes */

1071

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

1153

1072

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

1154

1073

if(p->pid != 0){

1155

1074

close(p->fd);

1162

1081

}

1163

1082

1164

1083

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

1165

do {

1084

do{

1166

1085

ret = wait(NULL);

1167

1086

} while(ret >= 0);

1168

1087

if(errno != ECHILD){

1169

1088

perror("wait");

1170

1089

}

1171

1090

1172

1091

free_plugin_list();

1173

1092

1174

1093

free(plugindir);