/mandos/release : revision 237.11.2

53

sockaddr_in6, PF_INET6,

54

SOCK_STREAM, uid_t, gid_t, open(),

55

opendir(), DIR */

56

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

56

#include <sys/stat.h> /* open() */

57

#include <sys/socket.h> /* socket(), struct sockaddr_in6,

58

inet_pton(), connect() */

59

#include <fcntl.h> /* open() */

85

raise() */

86

#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,

87

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

88

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

89

WEXITSTATUS(), WTERMSIG() */

90

88

91

89

#ifdef __linux__

92

90

#include <sys/klog.h> /* klogctl() */

110

108

init_gnutls_session(),

111

109

GNUTLS_* */

112

110

#include <gnutls/openpgp.h>

113

/* gnutls_certificate_set_openpgp_key_file(),

114

GNUTLS_OPENPGP_FMT_BASE64 */

111

/* gnutls_certificate_set_openpgp_key_file(),

112

GNUTLS_OPENPGP_FMT_BASE64 */

115

113

116

114

/* GPGME */

117

115

#include <gpgme.h> /* All GPGME types, constants and

125

123

#define PATHDIR "/conf/conf.d/mandos"

126

124

#define SECKEY "seckey.txt"

127

125

#define PUBKEY "pubkey.txt"

128

#define HOOKDIR "/lib/mandos/network-hooks.d"

129

126

130

127

bool debug = false;

131

128

static const char mandos_protocol_version[] = "1";

133

130

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

134

131

static const char sys_class_net[] = "/sys/class/net";

135

132

char *connect_to = NULL;

136

const char *hookdir = HOOKDIR;

137

133

138

134

/* Doubly linked list that need to be circularly linked when used */

139

135

typedef struct server{

180

176

* "buffer_length" is how much is already used.

181

177

*/

182

178

size_t incbuffer(char **buffer, size_t buffer_length,

183

size_t buffer_capacity){

179

size_t buffer_capacity){

184

180

if(buffer_length + BUFFER_SIZE > buffer_capacity){

185

181

*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);

186

182

if(buffer == NULL){

192

188

}

193

189

194

190

/* Add server to set of servers to retry periodically */

195

int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,

196

int af){

191

int add_server(const char *ip, uint16_t port,

192

AvahiIfIndex if_index,

193

int af){

197

194

int ret;

198

195

server *new_server = malloc(sizeof(server));

199

196

if(new_server == NULL){

201

198

return -1;

202

199

}

203

200

*new_server = (server){ .ip = strdup(ip),

204

.port = port,

205

.if_index = if_index,

206

.af = af };

201

.port = port,

202

.if_index = if_index,

203

.af = af };

207

204

if(new_server->ip == NULL){

208

205

perror_plus("strdup");

209

206

return -1;

231

228

/*

232

229

* Initialize GPGME.

233

230

*/

234

static bool init_gpgme(const char *seckey, const char *pubkey,

235

const char *tempdir){

231

static bool init_gpgme(const char *seckey,

232

const char *pubkey, const char *tempdir){

236

233

gpgme_error_t rc;

237

234

gpgme_engine_info_t engine_info;

238

235

253

250

254

251

rc = gpgme_data_new_from_fd(&pgp_data, fd);

255

252

if(rc != GPG_ERR_NO_ERROR){

256

fprintf(stderr, "Mandos plugin mandos-client: "

257

"bad gpgme_data_new_from_fd: %s: %s\n",

253

fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",

258

254

gpgme_strsource(rc), gpgme_strerror(rc));

259

255

return false;

260

256

}

261

257

262

258

rc = gpgme_op_import(mc.ctx, pgp_data);

263

259

if(rc != GPG_ERR_NO_ERROR){

264

fprintf(stderr, "Mandos plugin mandos-client: "

265

"bad gpgme_op_import: %s: %s\n",

260

fprintf(stderr, "bad gpgme_op_import: %s: %s\n",

266

261

gpgme_strsource(rc), gpgme_strerror(rc));

267

262

return false;

268

263

}

276

271

}

277

272

278

273

if(debug){

279

fprintf(stderr, "Mandos plugin mandos-client: "

280

"Initializing GPGME\n");

274

fprintf(stderr, "Initializing GPGME\n");

281

275

}

282

276

283

277

/* Init GPGME */

284

278

gpgme_check_version(NULL);

285

279

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

286

280

if(rc != GPG_ERR_NO_ERROR){

287

fprintf(stderr, "Mandos plugin mandos-client: "

288

"bad gpgme_engine_check_version: %s: %s\n",

281

fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",

289

282

gpgme_strsource(rc), gpgme_strerror(rc));

290

283

return false;

291

284

}

293

286

/* Set GPGME home directory for the OpenPGP engine only */

294

287

rc = gpgme_get_engine_info(&engine_info);

295

288

if(rc != GPG_ERR_NO_ERROR){

296

fprintf(stderr, "Mandos plugin mandos-client: "

297

"bad gpgme_get_engine_info: %s: %s\n",

289

fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",

298

290

gpgme_strsource(rc), gpgme_strerror(rc));

299

291

return false;

300

292

}

307

299

engine_info = engine_info->next;

308

300

}

309

301

if(engine_info == NULL){

310

fprintf(stderr, "Mandos plugin mandos-client: "

311

"Could not set GPGME home dir to %s\n", tempdir);

302

fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);

312

303

return false;

313

304

}

314

305

315

306

/* Create new GPGME "context" */

316

307

rc = gpgme_new(&(mc.ctx));

317

308

if(rc != GPG_ERR_NO_ERROR){

318

fprintf(stderr, "Mandos plugin mandos-client: "

319

"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),

320

gpgme_strerror(rc));

309

fprintf(stderr, "bad gpgme_new: %s: %s\n",

310

gpgme_strsource(rc), gpgme_strerror(rc));

321

311

return false;

322

312

}

323

313

342

332

ssize_t plaintext_length = 0;

343

333

344

334

if(debug){

345

fprintf(stderr, "Mandos plugin mandos-client: "

346

"Trying to decrypt OpenPGP data\n");

335

fprintf(stderr, "Trying to decrypt OpenPGP data\n");

347

336

}

348

337

349

338

/* Create new GPGME data buffer from memory cryptotext */

350

339

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

351

340

0);

352

341

if(rc != GPG_ERR_NO_ERROR){

353

fprintf(stderr, "Mandos plugin mandos-client: "

354

"bad gpgme_data_new_from_mem: %s: %s\n",

342

fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",

355

343

gpgme_strsource(rc), gpgme_strerror(rc));

356

344

return -1;

357

345

}

359

347

/* Create new empty GPGME data buffer for the plaintext */

360

348

rc = gpgme_data_new(&dh_plain);

361

349

if(rc != GPG_ERR_NO_ERROR){

362

fprintf(stderr, "Mandos plugin mandos-client: "

363

"bad gpgme_data_new: %s: %s\n",

350

fprintf(stderr, "bad gpgme_data_new: %s: %s\n",

364

351

gpgme_strsource(rc), gpgme_strerror(rc));

365

352

gpgme_data_release(dh_crypto);

366

353

return -1;

370

357

data buffer */

371

358

rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);

372

359

if(rc != GPG_ERR_NO_ERROR){

373

fprintf(stderr, "Mandos plugin mandos-client: "

374

"bad gpgme_op_decrypt: %s: %s\n",

360

fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",

375

361

gpgme_strsource(rc), gpgme_strerror(rc));

376

362

plaintext_length = -1;

377

363

if(debug){

378

364

gpgme_decrypt_result_t result;

379

365

result = gpgme_op_decrypt_result(mc.ctx);

380

366

if(result == NULL){

381

fprintf(stderr, "Mandos plugin mandos-client: "

382

"gpgme_op_decrypt_result failed\n");

367

fprintf(stderr, "gpgme_op_decrypt_result failed\n");

383

368

} else {

384

fprintf(stderr, "Mandos plugin mandos-client: "

385

"Unsupported algorithm: %s\n",

369

fprintf(stderr, "Unsupported algorithm: %s\n",

386

370

result->unsupported_algorithm);

387

fprintf(stderr, "Mandos plugin mandos-client: "

388

"Wrong key usage: %u\n",

371

fprintf(stderr, "Wrong key usage: %u\n",

389

372

result->wrong_key_usage);

390

373

if(result->file_name != NULL){

391

fprintf(stderr, "Mandos plugin mandos-client: "

392

"File name: %s\n", result->file_name);

374

fprintf(stderr, "File name: %s\n", result->file_name);

393

375

}

394

376

gpgme_recipient_t recipient;

395

377

recipient = result->recipients;

396

378

while(recipient != NULL){

397

fprintf(stderr, "Mandos plugin mandos-client: "

398

"Public key algorithm: %s\n",

379

fprintf(stderr, "Public key algorithm: %s\n",

399

380

gpgme_pubkey_algo_name(recipient->pubkey_algo));

400

fprintf(stderr, "Mandos plugin mandos-client: "

401

"Key ID: %s\n", recipient->keyid);

402

fprintf(stderr, "Mandos plugin mandos-client: "

403

"Secret key available: %s\n",

381

fprintf(stderr, "Key ID: %s\n", recipient->keyid);

382

fprintf(stderr, "Secret key available: %s\n",

404

383

recipient->status == GPG_ERR_NO_SECKEY

405

384

? "No" : "Yes");

406

385

recipient = recipient->next;

411

390

}

412

391

413

392

if(debug){

414

fprintf(stderr, "Mandos plugin mandos-client: "

415

"Decryption of OpenPGP data succeeded\n");

393

fprintf(stderr, "Decryption of OpenPGP data succeeded\n");

416

394

}

417

395

418

396

/* Seek back to the beginning of the GPGME plaintext data buffer */

425

403

*plaintext = NULL;

426

404

while(true){

427

405

plaintext_capacity = incbuffer(plaintext,

428

(size_t)plaintext_length,

429

plaintext_capacity);

406

(size_t)plaintext_length,

407

plaintext_capacity);

430

408

if(plaintext_capacity == 0){

431

perror_plus("incbuffer");

432

plaintext_length = -1;

433

goto decrypt_end;

409

perror_plus("incbuffer");

410

plaintext_length = -1;

411

goto decrypt_end;

434

412

}

435

413

436

414

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

449

427

}

450

428

451

429

if(debug){

452

fprintf(stderr, "Mandos plugin mandos-client: "

453

"Decrypted password is: ");

430

fprintf(stderr, "Decrypted password is: ");

454

431

for(ssize_t i = 0; i < plaintext_length; i++){

455

432

fprintf(stderr, "%02hhX ", (*plaintext)[i]);

456

433

}

478

455

/* GnuTLS log function callback */

479

456

static void debuggnutls(__attribute__((unused)) int level,

480

457

const char* string){

481

fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);

458

fprintf(stderr, "GnuTLS: %s", string);

482

459

}

483

460

484

461

static int init_gnutls_global(const char *pubkeyfilename,

486

463

int ret;

487

464

488

465

if(debug){

489

fprintf(stderr, "Mandos plugin mandos-client: "

490

"Initializing GnuTLS\n");

466

fprintf(stderr, "Initializing GnuTLS\n");

491

467

}

492

468

493

469

ret = gnutls_global_init();

494

470

if(ret != GNUTLS_E_SUCCESS){

495

fprintf(stderr, "Mandos plugin mandos-client: "

496

"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));

471

fprintf(stderr, "GnuTLS global_init: %s\n",

472

safer_gnutls_strerror(ret));

497

473

return -1;

498

474

}

499

475

508

484

/* OpenPGP credentials */

509

485

ret = gnutls_certificate_allocate_credentials(&mc.cred);

510

486

if(ret != GNUTLS_E_SUCCESS){

511

fprintf(stderr, "Mandos plugin mandos-client: "

512

"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));

487

fprintf(stderr, "GnuTLS memory error: %s\n",

488

safer_gnutls_strerror(ret));

513

489

gnutls_global_deinit();

514

490

return -1;

515

491

}

516

492

517

493

if(debug){

518

fprintf(stderr, "Mandos plugin mandos-client: "

519

"Attempting to use OpenPGP public key %s and"

494

fprintf(stderr, "Attempting to use OpenPGP public key %s and"

520

495

" secret key %s as GnuTLS credentials\n", pubkeyfilename,

521

496

seckeyfilename);

522

497

}

526

501

GNUTLS_OPENPGP_FMT_BASE64);

527

502

if(ret != GNUTLS_E_SUCCESS){

528

503

fprintf(stderr,

529

"Mandos plugin mandos-client: "

530

504

"Error[%d] while reading the OpenPGP key pair ('%s',"

531

505

" '%s')\n", ret, pubkeyfilename, seckeyfilename);

532

fprintf(stderr, "Mandos plugin mandos-client: "

533

"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));

506

fprintf(stderr, "The GnuTLS error is: %s\n",

507

safer_gnutls_strerror(ret));

534

508

goto globalfail;

535

509

}

536

510

537

511

/* GnuTLS server initialization */

538

512

ret = gnutls_dh_params_init(&mc.dh_params);

539

513

if(ret != GNUTLS_E_SUCCESS){

540

fprintf(stderr, "Mandos plugin mandos-client: "

541

"Error in GnuTLS DH parameter initialization:"

514

fprintf(stderr, "Error in GnuTLS DH parameter initialization:"

542

515

" %s\n", safer_gnutls_strerror(ret));

543

516

goto globalfail;

544

517

}

545

518

ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);

546

519

if(ret != GNUTLS_E_SUCCESS){

547

fprintf(stderr, "Mandos plugin mandos-client: "

548

"Error in GnuTLS prime generation: %s\n",

520

fprintf(stderr, "Error in GnuTLS prime generation: %s\n",

549

521

safer_gnutls_strerror(ret));

550

522

goto globalfail;

551

523

}

572

544

}

573

545

} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);

574

546

if(ret != GNUTLS_E_SUCCESS){

575

fprintf(stderr, "Mandos plugin mandos-client: "

576

"Error in GnuTLS session initialization: %s\n",

547

fprintf(stderr, "Error in GnuTLS session initialization: %s\n",

577

548

safer_gnutls_strerror(ret));

578

549

}

579

550

587

558

}

588

559

} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);

589

560

if(ret != GNUTLS_E_SUCCESS){

590

fprintf(stderr, "Mandos plugin mandos-client: "

591

"Syntax error at: %s\n", err);

592

fprintf(stderr, "Mandos plugin mandos-client: "

593

"GnuTLS error: %s\n", safer_gnutls_strerror(ret));

561

fprintf(stderr, "Syntax error at: %s\n", err);

562

fprintf(stderr, "GnuTLS error: %s\n",

563

safer_gnutls_strerror(ret));

594

564

gnutls_deinit(*session);

595

565

return -1;

596

566

}

605

575

}

606

576

} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);

607

577

if(ret != GNUTLS_E_SUCCESS){

608

fprintf(stderr, "Mandos plugin mandos-client: "

609

"Error setting GnuTLS credentials: %s\n",

578

fprintf(stderr, "Error setting GnuTLS credentials: %s\n",

610

579

safer_gnutls_strerror(ret));

611

580

gnutls_deinit(*session);

612

581

return -1;

658

627

pf = PF_INET;

659

628

break;

660

629

default:

661

fprintf(stderr, "Mandos plugin mandos-client: "

662

"Bad address family: %d\n", af);

630

fprintf(stderr, "Bad address family: %d\n", af);

663

631

errno = EINVAL;

664

632

return -1;

665

633

}

670

638

}

671

639

672

640

if(debug){

673

fprintf(stderr, "Mandos plugin mandos-client: "

674

"Setting up a TCP connection to %s, port %" PRIu16

641

fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16

675

642

"\n", ip, port);

676

643

}

677

644

704

671

}

705

672

if(ret == 0){

706

673

int e = errno;

707

fprintf(stderr, "Mandos plugin mandos-client: "

708

"Bad address: %s\n", ip);

674

fprintf(stderr, "Bad address: %s\n", ip);

709

675

errno = e;

710

676

goto mandos_end;

711

677

}

716

682

717

683

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

718

684

(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and

719

-Wunreachable-code*/

685

-Wunreachable-code*/

720

686

if(if_index == AVAHI_IF_UNSPEC){

721

fprintf(stderr, "Mandos plugin mandos-client: "

722

"An IPv6 link-local address is incomplete"

687

fprintf(stderr, "An IPv6 link-local address is incomplete"

723

688

" without a network interface\n");

724

689

errno = EINVAL;

725

690

goto mandos_end;

744

709

if(if_indextoname((unsigned int)if_index, interface) == NULL){

745

710

perror_plus("if_indextoname");

746

711

} else {

747

fprintf(stderr, "Mandos plugin mandos-client: "

748

"Connection to: %s%%%s, port %" PRIu16 "\n",

712

fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",

749

713

ip, interface, port);

750

714

}

751

715

} else {

752

fprintf(stderr, "Mandos plugin mandos-client: "

753

"Connection to: %s, port %" PRIu16 "\n", ip, port);

716

fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,

717

port);

754

718

}

755

719

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

756

720

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

766

730

perror_plus("inet_ntop");

767

731

} else {

768

732

if(strcmp(addrstr, ip) != 0){

769

fprintf(stderr, "Mandos plugin mandos-client: "

770

"Canonical address form: %s\n", addrstr);

733

fprintf(stderr, "Canonical address form: %s\n", addrstr);

771

734

}

772

735

}

773

736

}

801

764

while(true){

802

765

size_t out_size = strlen(out);

803

766

ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,

804

out_size - written));

767

out_size - written));

805

768

if(ret == -1){

806

769

int e = errno;

807

770

perror_plus("write");

827

790

}

828

791

829

792

if(debug){

830

fprintf(stderr, "Mandos plugin mandos-client: "

831

"Establishing TLS session with %s\n", ip);

793

fprintf(stderr, "Establishing TLS session with %s\n", ip);

832

794

}

833

795

834

796

if(quit_now){

854

816

855

817

if(ret != GNUTLS_E_SUCCESS){

856

818

if(debug){

857

fprintf(stderr, "Mandos plugin mandos-client: "

858

"*** GnuTLS Handshake failed ***\n");

819

fprintf(stderr, "*** GnuTLS Handshake failed ***\n");

859

820

gnutls_perror(ret);

860

821

}

861

822

errno = EPROTO;

865

826

/* Read OpenPGP packet that contains the wanted password */

866

827

867

828

if(debug){

868

fprintf(stderr, "Mandos plugin mandos-client: "

869

"Retrieving OpenPGP encrypted password from %s\n", ip);

829

fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",

830

ip);

870

831

}

871

832

872

833

while(true){

877

838

}

878

839

879

840

buffer_capacity = incbuffer(&buffer, buffer_length,

880

buffer_capacity);

841

buffer_capacity);

881

842

if(buffer_capacity == 0){

882

843

int e = errno;

883

844

perror_plus("incbuffer");

910

871

}

911

872

} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);

912

873

if(ret < 0){

913

fprintf(stderr, "Mandos plugin mandos-client: "

914

"*** GnuTLS Re-handshake failed ***\n");

874

fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");

915

875

gnutls_perror(ret);

916

876

errno = EPROTO;

917

877

goto mandos_end;

918

878

}

919

879

break;

920

880

default:

921

fprintf(stderr, "Mandos plugin mandos-client: "

922

"Unknown error while reading data from"

881

fprintf(stderr, "Unknown error while reading data from"

923

882

" encrypted session with Mandos server\n");

924

883

gnutls_bye(session, GNUTLS_SHUT_RDWR);

925

884

errno = EIO;

931

890

}

932

891

933

892

if(debug){

934

fprintf(stderr, "Mandos plugin mandos-client: "

935

"Closing TLS session\n");

893

fprintf(stderr, "Closing TLS session\n");

936

894

}

937

895

938

896

if(quit_now){

950

908

951

909

if(buffer_length > 0){

952

910

ssize_t decrypted_buffer_size;

953

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

911

decrypted_buffer_size = pgp_packet_decrypt(buffer,

912

buffer_length,

954

913

&decrypted_buffer);

955

914

if(decrypted_buffer_size >= 0){

956

915

967

926

if(ret == 0 and ferror(stdout)){

968

927

int e = errno;

969

928

if(debug){

970

fprintf(stderr, "Mandos plugin mandos-client: "

971

"Error writing encrypted data: %s\n",

929

fprintf(stderr, "Error writing encrypted data: %s\n",

972

930

strerror(errno));

973

931

}

974

932

errno = e;

1032

990

switch(event){

1033

991

default:

1034

992

case AVAHI_RESOLVER_FAILURE:

1035

fprintf(stderr, "Mandos plugin mandos-client: "

1036

"(Avahi Resolver) Failed to resolve service '%s'"

993

fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"

1037

994

" of type '%s' in domain '%s': %s\n", name, type, domain,

1038

995

avahi_strerror(avahi_server_errno(mc.server)));

1039

996

break;

1043

1000

char ip[AVAHI_ADDRESS_STR_MAX];

1044

1001

avahi_address_snprint(ip, sizeof(ip), address);

1045

1002

if(debug){

1046

fprintf(stderr, "Mandos plugin mandos-client: "

1047

"Mandos server \"%s\" found on %s (%s, %"

1003

fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"

1048

1004

PRIdMAX ") on port %" PRIu16 "\n", name, host_name,

1049

1005

ip, (intmax_t)interface, port);

1050

1006

}

1084

1040

default:

1085

1041

case AVAHI_BROWSER_FAILURE:

1086

1042

1087

fprintf(stderr, "Mandos plugin mandos-client: "

1088

"(Avahi browser) %s\n",

1043

fprintf(stderr, "(Avahi browser) %s\n",

1089

1044

avahi_strerror(avahi_server_errno(mc.server)));

1090

1045

avahi_simple_poll_quit(mc.simple_poll);

1091

1046

return;

1099

1054

if(avahi_s_service_resolver_new(mc.server, interface, protocol,

1100

1055

name, type, domain, protocol, 0,

1101

1056

resolve_callback, NULL) == NULL)

1102

fprintf(stderr, "Mandos plugin mandos-client: "

1103

"Avahi: Failed to resolve service '%s': %s\n",

1057

fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",

1104

1058

name, avahi_strerror(avahi_server_errno(mc.server)));

1105

1059

break;

1106

1060

1110

1064

case AVAHI_BROWSER_ALL_FOR_NOW:

1111

1065

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1112

1066

if(debug){

1113

fprintf(stderr, "Mandos plugin mandos-client: "

1114

"No Mandos server found, still searching...\n");

1067

fprintf(stderr, "No Mandos server found, still searching...\n");

1115

1068

}

1116

1069

break;

1117

1070

}

1132

1085

errno = old_errno;

1133

1086

}

1134

1087

1135

bool get_flags(const char *ifname, struct ifreq *ifr){

1136

int ret;

1137

1138

int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1139

if(s < 0){

1140

perror_plus("socket");

1141

return false;

1142

}

1143

strcpy(ifr->ifr_name, ifname);

1144

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1145

if(ret == -1){

1088

/*

1089

* This function determines if a directory entry in /sys/class/net

1090

* corresponds to an acceptable network device.

1091

* (This function is passed to scandir(3) as a filter function.)

1092

*/

1093

int good_interface(const struct dirent *if_entry){

1094

ssize_t ssret;

1095

char *flagname = NULL;

1096

if(if_entry->d_name[0] == '.'){

1097

return 0;

1098

}

1099

int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,

1100

if_entry->d_name);

1101

if(ret < 0){

1102

perror_plus("asprintf");

1103

return 0;

1104

}

1105

int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));

1106

if(flags_fd == -1){

1107

perror_plus("open");

1108

free(flagname);

1109

return 0;

1110

}

1111

free(flagname);

1112

typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */

1113

/* read line from flags_fd */

1114

ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */

1115

char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */

1116

flagstring[(size_t)to_read] = '\0';

1117

if(flagstring == NULL){

1118

perror_plus("malloc");

1119

close(flags_fd);

1120

return 0;

1121

}

1122

while(to_read > 0){

1123

ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,

1124

(size_t)to_read));

1125

if(ssret == -1){

1126

perror_plus("read");

1127

free(flagstring);

1128

close(flags_fd);

1129

return 0;

1130

}

1131

to_read -= ssret;

1132

if(ssret == 0){

1133

break;

1134

}

1135

}

1136

close(flags_fd);

1137

intmax_t tmpmax;

1138

char *tmp;

1139

errno = 0;

1140

tmpmax = strtoimax(flagstring, &tmp, 0);

1141

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

1142

and not (isspace(*tmp)))

1143

or tmpmax != (ifreq_flags)tmpmax){

1146

1144

if(debug){

1147

perror_plus("ioctl SIOCGIFFLAGS");

1145

fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",

1146

flagstring, if_entry->d_name);

1148

1147

}

1149

return false;

1148

free(flagstring);

1149

return 0;

1150

}

1151

return true;

1152

}

1153

1154

bool good_flags(const char *ifname, const struct ifreq *ifr){

1155

1151

free(flagstring);

1152

ifreq_flags flags = (ifreq_flags)tmpmax;

1156

1153

/* Reject the loopback device */

1157

if(ifr->ifr_flags & IFF_LOOPBACK){

1154

if(flags & IFF_LOOPBACK){

1158

1155

if(debug){

1159

fprintf(stderr, "Mandos plugin mandos-client: "

1160

"Rejecting loopback interface \"%s\"\n", ifname);

1156

fprintf(stderr, "Rejecting loopback interface \"%s\"\n",

1157

if_entry->d_name);

1161

1158

}

1162

return false;

1159

return 0;

1163

1160

}

1164

1161

/* Accept point-to-point devices only if connect_to is specified */

1165

if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){

1162

if(connect_to != NULL and (flags & IFF_POINTOPOINT)){

1166

1163

if(debug){

1167

fprintf(stderr, "Mandos plugin mandos-client: "

1168

"Accepting point-to-point interface \"%s\"\n", ifname);

1164

fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",

1165

if_entry->d_name);

1169

1166

}

1170

return true;

1167

return 1;

1171

1168

}

1172

1169

/* Otherwise, reject non-broadcast-capable devices */

1173

if(not (ifr->ifr_flags & IFF_BROADCAST)){

1170

if(not (flags & IFF_BROADCAST)){

1174

1171

if(debug){

1175

fprintf(stderr, "Mandos plugin mandos-client: "

1176

"Rejecting non-broadcast interface \"%s\"\n", ifname);

1172

fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",

1173

if_entry->d_name);

1177

1174

}

1178

return false;

1175

return 0;

1179

1176

}

1180

1177

/* Reject non-ARP interfaces (including dummy interfaces) */

1181

if(ifr->ifr_flags & IFF_NOARP){

1178

if(flags & IFF_NOARP){

1182

1179

if(debug){

1183

fprintf(stderr, "Mandos plugin mandos-client: "

1184

"Rejecting non-ARP interface \"%s\"\n", ifname);

1180

fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",

1181

if_entry->d_name);

1185

1182

}

1186

return false;

1183

return 0;

1187

1184

}

1188

1189

1185

/* Accept this device */

1190

1186

if(debug){

1191

fprintf(stderr, "Mandos plugin mandos-client: "

1192

"Interface \"%s\" is good\n", ifname);

1193

}

1194

return true;

1195

}

1196

1197

/*

1198

* This function determines if a directory entry in /sys/class/net

1199

* corresponds to an acceptable network device.

1200

* (This function is passed to scandir(3) as a filter function.)

1201

*/

1202

int good_interface(const struct dirent *if_entry){

1203

if(if_entry->d_name[0] == '.'){

1204

return 0;

1205

}

1206

1207

struct ifreq ifr;

1208

if(not get_flags(if_entry->d_name, &ifr)){

1209

if(debug){

1210

fprintf(stderr, "Mandos plugin mandos-client: "

1211

"Failed to get flags for interface \"%s\"\n",

1212

if_entry->d_name);

1213

}

1214

return 0;

1215

}

1216

1217

if(not good_flags(if_entry->d_name, &ifr)){

1218

return 0;

1219

}

1220

return 1;

1221

}

1222

1223

/*

1224

* This function determines if a directory entry in /sys/class/net

1225

* corresponds to an acceptable network device which is up.

1226

* (This function is passed to scandir(3) as a filter function.)

1227

*/

1228

int up_interface(const struct dirent *if_entry){

1229

if(if_entry->d_name[0] == '.'){

1230

return 0;

1231

}

1232

1233

struct ifreq ifr;

1234

if(not get_flags(if_entry->d_name, &ifr)){

1235

if(debug){

1236

fprintf(stderr, "Mandos plugin mandos-client: "

1237

"Failed to get flags for interface \"%s\"\n",

1238

if_entry->d_name);

1239

}

1240

return 0;

1241

}

1242

1243

/* Reject down interfaces */

1244

if(not (ifr.ifr_flags & IFF_UP)){

1245

if(debug){

1246

fprintf(stderr, "Mandos plugin mandos-client: "

1247

"Rejecting down interface \"%s\"\n",

1248

if_entry->d_name);

1249

}

1250

return 0;

1251

}

1252

1253

/* Reject non-running interfaces */

1254

if(not (ifr.ifr_flags & IFF_RUNNING)){

1255

if(debug){

1256

fprintf(stderr, "Mandos plugin mandos-client: "

1257

"Rejecting non-running interface \"%s\"\n",

1258

if_entry->d_name);

1259

}

1260

return 0;

1261

}

1262

1263

if(not good_flags(if_entry->d_name, &ifr)){

1264

return 0;

1187

fprintf(stderr, "Interface \"%s\" is acceptable\n",

1188

if_entry->d_name);

1265

1189

}

1266

1190

return 1;

1267

1191

}

1277

1201

return 1;

1278

1202

}

1279

1203

1280

/* Is this directory entry a runnable program? */

1281

int runnable_hook(const struct dirent *direntry){

1282

int ret;

1283

size_t sret;

1284

struct stat st;

1285

1286

if((direntry->d_name)[0] == '\0'){

1287

/* Empty name? */

1288

return 0;

1289

}

1290

1291

sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"

1292

"abcdefghijklmnopqrstuvwxyz"

1293

"0123456789"

1294

"_-");

1295

if((direntry->d_name)[sret] != '\0'){

1296

/* Contains non-allowed characters */

1297

if(debug){

1298

fprintf(stderr, "Mandos plugin mandos-client: "

1299

"Ignoring hook \"%s\" with bad name\n",

1300

direntry->d_name);

1301

}

1302

return 0;

1303

}

1304

1305

char *fullname = NULL;

1306

ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);

1307

if(ret < 0){

1308

perror_plus("asprintf");

1309

return 0;

1310

}

1311

1312

ret = stat(fullname, &st);

1313

if(ret == -1){

1314

if(debug){

1315

perror_plus("Could not stat hook");

1316

}

1317

return 0;

1318

}

1319

if(not (S_ISREG(st.st_mode))){

1320

/* Not a regular file */

1321

if(debug){

1322

fprintf(stderr, "Mandos plugin mandos-client: "

1323

"Ignoring hook \"%s\" - not a file\n",

1324

direntry->d_name);

1325

}

1326

return 0;

1327

}

1328

if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){

1329

/* Not executable */

1330

if(debug){

1331

fprintf(stderr, "Mandos plugin mandos-client: "

1332

"Ignoring hook \"%s\" - not executable\n",

1333

direntry->d_name);

1334

}

1335

return 0;

1336

}

1337

return 1;

1338

}

1339

1340

1204

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1341

1205

int ret;

1342

1206

struct timespec now;

1346

1210

while(true){

1347

1211

if(mc.current_server == NULL){

1348

1212

if (debug){

1349

fprintf(stderr, "Mandos plugin mandos-client: "

1213

fprintf(stderr,

1350

1214

"Wait until first server is found. No timeout!\n");

1351

1215

}

1352

1216

ret = avahi_simple_poll_iterate(s, -1);

1353

1217

} else {

1354

1218

if (debug){

1355

fprintf(stderr, "Mandos plugin mandos-client: "

1356

"Check current_server if we should run it,"

1219

fprintf(stderr, "Check current_server if we should run it,"

1357

1220

" or wait\n");

1358

1221

}

1359

1222

/* the current time */

1376

1239

- ((intmax_t)waited_time.tv_nsec / 1000000));

1377

1240

1378

1241

if (debug){

1379

fprintf(stderr, "Mandos plugin mandos-client: "

1380

"Blocking for %" PRIdMAX " ms\n", block_time);

1242

fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);

1381

1243

}

1382

1244

1383

1245

if(block_time <= 0){

1403

1265

ret = avahi_simple_poll_iterate(s, (int)block_time);

1404

1266

}

1405

1267

if(ret != 0){

1406

if (ret > 0 or errno != EINTR){

1268

if (ret > 0 or errno != EINTR) {

1407

1269

return (ret != 1) ? ret : 0;

1408

1270

}

1409

1271

}

1497

1359

.arg = "SECONDS",

1498

1360

.doc = "Retry interval used when denied by the mandos server",

1499

1361

.group = 2 },

1500

{ .name = "network-hook-dir", .key = 133,

1501

.arg = "DIR",

1502

.doc = "Directory where network hooks are located",

1503

.group = 2 },

1504

1362

/*

1505

1363

* These reproduce what we would get without ARGP_NO_HELP

1506

1364

*/

1559

1417

argp_error(state, "Bad retry interval");

1560

1418

}

1561

1419

break;

1562

case 133: /* --network-hook-dir */

1563

hookdir = arg;

1564

break;

1565

1420

/*

1566

1421

* These reproduce what we would get without ARGP_NO_HELP

1567

1422

*/

1573

1428

argp_state_help(state, state->out_stream,

1574

1429

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1575

1430

case 'V': /* --version */

1576

fprintf(state->out_stream, "Mandos plugin mandos-client: ");

1577

1431

fprintf(state->out_stream, "%s\n", argp_program_version);

1578

1432

exit(argp_err_exit_status);

1579

1433

break;

1664

1518

}

1665

1519

}

1666

1520

1667

/* Find network hooks and run them */

1668

{

1669

struct dirent **direntries;

1670

struct dirent *direntry;

1671

int numhooks = scandir(hookdir, &direntries, runnable_hook,

1672

alphasort);

1673

if(numhooks == -1){

1674

perror_plus("scandir");

1675

} else {

1676

int devnull = open("/dev/null", O_RDONLY);

1677

for(int i = 0; i < numhooks; i++){

1678

direntry = direntries[0];

1679

char *fullname = NULL;

1680

ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);

1681

if(ret < 0){

1682

perror_plus("asprintf");

1683

continue;

1684

}

1685

pid_t hook_pid = fork();

1686

if(hook_pid == 0){

1687

/* Child */

1688

dup2(devnull, STDIN_FILENO);

1689

close(devnull);

1690

dup2(STDERR_FILENO, STDOUT_FILENO);

1691

ret = setenv("DEVICE", interface, 1);

1692

if(ret == -1){

1693

perror_plus("setenv");

1694

exit(1);

1695

}

1696

ret = setenv("VERBOSE", debug ? "1" : "0", 1);

1697

if(ret == -1){

1698

perror_plus("setenv");

1699

exit(1);

1700

}

1701

ret = setenv("MODE", "start", 1);

1702

if(ret == -1){

1703

perror_plus("setenv");

1704

exit(1);

1705

}

1706

char *delaystring;

1707

ret = asprintf(&delaystring, "%f", delay);

1708

if(ret == -1){

1709

perror_plus("asprintf");

1710

exit(1);

1711

}

1712

ret = setenv("DELAY", delaystring, 1);

1713

if(ret == -1){

1714

free(delaystring);

1715

perror_plus("setenv");

1716

exit(1);

1717

}

1718

free(delaystring);

1719

ret = execl(fullname, direntry->d_name, "start", NULL);

1720

perror_plus("execl");

1721

} else {

1722

int status;

1723

if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){

1724

perror_plus("waitpid");

1725

free(fullname);

1726

continue;

1727

}

1728

if(WIFEXITED(status)){

1729

if(WEXITSTATUS(status) != 0){

1730

fprintf(stderr, "Mandos plugin mandos-client: "

1731

"Warning: network hook \"%s\" exited"

1732

" with status %d\n", direntry->d_name,

1733

WEXITSTATUS(status));

1734

free(fullname);

1735

continue;

1736

}

1737

} else if(WIFSIGNALED(status)){

1738

fprintf(stderr, "Mandos plugin mandos-client: "

1739

"Warning: network hook \"%s\" died by"

1740

" signal %d\n", direntry->d_name,

1741

WTERMSIG(status));

1742

free(fullname);

1743

continue;

1744

} else {

1745

fprintf(stderr, "Mandos plugin mandos-client: "

1746

"Warning: network hook \"%s\" crashed\n",

1747

direntry->d_name);

1748

free(fullname);

1749

continue;

1750

}

1751

}

1752

free(fullname);

1753

if(quit_now){

1754

goto end;

1755

}

1756

}

1757

close(devnull);

1758

}

1759

}

1760

1761

1521

if(not debug){

1762

1522

avahi_set_log_function(empty_log);

1763

1523

}

1764

1524

1765

1525

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

1766

1526

struct dirent **direntries;

1767

/* First look for interfaces that are up */

1768

ret = scandir(sys_class_net, &direntries, up_interface,

1527

ret = scandir(sys_class_net, &direntries, good_interface,

1769

1528

alphasort);

1770

if(ret == 0){

1771

/* No up interfaces, look for any good interfaces */

1772

free(direntries);

1773

ret = scandir(sys_class_net, &direntries, good_interface,

1774

alphasort);

1775

}

1776

1529

if(ret >= 1){

1777

/* Pick the first interface returned */

1530

/* Pick the first good interface */

1778

1531

interface = strdup(direntries[0]->d_name);

1779

1532

if(debug){

1780

fprintf(stderr, "Mandos plugin mandos-client: "

1781

"Using interface \"%s\"\n", interface);

1533

fprintf(stderr, "Using interface \"%s\"\n", interface);

1782

1534

}

1783

1535

if(interface == NULL){

1784

1536

perror_plus("malloc");

1789

1541

free(direntries);

1790

1542

} else {

1791

1543

free(direntries);

1792

fprintf(stderr, "Mandos plugin mandos-client: "

1793

"Could not find a network interface\n");

1544

fprintf(stderr, "Could not find a network interface\n");

1794

1545

exitcode = EXIT_FAILURE;

1795

1546

goto end;

1796

1547

}

1802

1553

srand((unsigned int) time(NULL));

1803

1554

mc.simple_poll = avahi_simple_poll_new();

1804

1555

if(mc.simple_poll == NULL){

1805

fprintf(stderr, "Mandos plugin mandos-client: "

1806

"Avahi: Failed to create simple poll object.\n");

1556

fprintf(stderr, "Avahi: Failed to create simple poll object.\n");

1807

1557

exitcode = EX_UNAVAILABLE;

1808

1558

goto end;

1809

1559

}

1875

1625

if(strcmp(interface, "none") != 0){

1876

1626

if_index = (AvahiIfIndex) if_nametoindex(interface);

1877

1627

if(if_index == 0){

1878

fprintf(stderr, "Mandos plugin mandos-client: "

1879

"No such interface: \"%s\"\n", interface);

1628

fprintf(stderr, "No such interface: \"%s\"\n", interface);

1880

1629

exitcode = EX_UNAVAILABLE;

1881

1630

goto end;

1882

1631

}

2023

1772

2024

1773

ret = init_gnutls_global(pubkey, seckey);

2025

1774

if(ret == -1){

2026

fprintf(stderr, "Mandos plugin mandos-client: "

2027

"init_gnutls_global failed\n");

1775

fprintf(stderr, "init_gnutls_global failed\n");

2028

1776

exitcode = EX_UNAVAILABLE;

2029

1777

goto end;

2030

1778

} else {

2046

1794

}

2047

1795

2048

1796

if(not init_gpgme(pubkey, seckey, tempdir)){

2049

fprintf(stderr, "Mandos plugin mandos-client: "

2050

"init_gpgme failed\n");

1797

fprintf(stderr, "init_gpgme failed\n");

2051

1798

exitcode = EX_UNAVAILABLE;

2052

1799

goto end;

2053

1800

} else {

2063

1810

/* (Mainly meant for debugging) */

2064

1811

char *address = strrchr(connect_to, ':');

2065

1812

if(address == NULL){

2066

fprintf(stderr, "Mandos plugin mandos-client: "

2067

"No colon in address\n");

1813

fprintf(stderr, "No colon in address\n");

2068

1814

exitcode = EX_USAGE;

2069

1815

goto end;

2070

1816

}

2078

1824

tmpmax = strtoimax(address+1, &tmp, 10);

2079

1825

if(errno != 0 or tmp == address+1 or *tmp != '\0'

2080

1826

or tmpmax != (uint16_t)tmpmax){

2081

fprintf(stderr, "Mandos plugin mandos-client: "

2082

"Bad port number\n");

1827

fprintf(stderr, "Bad port number\n");

2083

1828

exitcode = EX_USAGE;

2084

1829

goto end;

2085

1830

}

2115

1860

break;

2116

1861

}

2117

1862

if(debug){

2118

fprintf(stderr, "Mandos plugin mandos-client: "

2119

"Retrying in %d seconds\n", (int)retry_interval);

1863

fprintf(stderr, "Retrying in %d seconds\n",

1864

(int)retry_interval);

2120

1865

}

2121

1866

sleep((int)retry_interval);

2122

1867

}

2124

1869

if (not quit_now){

2125

1870

exitcode = EXIT_SUCCESS;

2126

1871

}

2127

1872

2128

1873

goto end;

2129

1874

}

2130

1875

2152

1897

2153

1898

/* Check if creating the Avahi server object succeeded */

2154

1899

if(mc.server == NULL){

2155

fprintf(stderr, "Mandos plugin mandos-client: "

2156

"Failed to create Avahi server: %s\n",

1900

fprintf(stderr, "Failed to create Avahi server: %s\n",

2157

1901

avahi_strerror(error));

2158

1902

exitcode = EX_UNAVAILABLE;

2159

1903

goto end;

2168

1912

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2169

1913

NULL, 0, browse_callback, NULL);

2170

1914

if(sb == NULL){

2171

fprintf(stderr, "Mandos plugin mandos-client: "

2172

"Failed to create service browser: %s\n",

1915

fprintf(stderr, "Failed to create service browser: %s\n",

2173

1916

avahi_strerror(avahi_server_errno(mc.server)));

2174

1917

exitcode = EX_UNAVAILABLE;

2175

1918

goto end;

2182

1925

/* Run the main loop */

2183

1926

2184

1927

if(debug){

2185

fprintf(stderr, "Mandos plugin mandos-client: "

2186

"Starting Avahi loop search\n");

1928

fprintf(stderr, "Starting Avahi loop search\n");

2187

1929

}

2188

1930

2189

1931

ret = avahi_loop_with_timeout(mc.simple_poll,

2190

1932

(int)(retry_interval * 1000));

2191

1933

if(debug){

2192

fprintf(stderr, "Mandos plugin mandos-client: "

2193

"avahi_loop_with_timeout exited %s\n",

1934

fprintf(stderr, "avahi_loop_with_timeout exited %s\n",

2194

1935

(ret == 0) ? "successfully" : "with error");

2195

1936

}

2196

1937

2197

1938

end:

2198

1939

2199

1940

if(debug){

2200

fprintf(stderr, "Mandos plugin mandos-client: "

2201

"%s exiting\n", argv[0]);

1941

fprintf(stderr, "%s exiting\n", argv[0]);

2202

1942

}

2203

1943

2204

1944

/* Cleanup things */

2232

1972

}

2233

1973

}

2234

1974

2235

/* XXX run network hooks "stop" here */

2236

2237

1975

/* Take down the network interface */

2238

1976

if(take_down_interface){

2239

1977

/* Re-raise priviliges */

2246

1984

ret = ioctl(sd, SIOCGIFFLAGS, &network);

2247

1985

if(ret == -1){

2248

1986

perror_plus("ioctl SIOCGIFFLAGS");

2249

} else if(network.ifr_flags & IFF_UP){

1987

} else if(network.ifr_flags & IFF_UP) {

2250

1988

network.ifr_flags &= ~(short)IFF_UP; /* clear flag */

2251

1989

ret = ioctl(sd, SIOCSIFFLAGS, &network);

2252

1990

if(ret == -1){

2284

2022

}

2285

2023

ret = remove(fullname);

2286

2024

if(ret == -1){

2287

fprintf(stderr, "Mandos plugin mandos-client: "

2288

"remove(\"%s\"): %s\n", fullname, strerror(errno));

2025

fprintf(stderr, "remove(\"%s\"): %s\n", fullname,

2026

strerror(errno));

2289

2027

}

2290

2028

free(fullname);

2291

2029

}