/mandos/release : revision 237.16.6

53

sockaddr_in6, PF_INET6,

54

SOCK_STREAM, uid_t, gid_t, open(),

55

opendir(), DIR */

56

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

56

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

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() */

88

90

89

91

#ifdef __linux__

90

92

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

108

110

init_gnutls_session(),

109

111

GNUTLS_* */

110

112

#include <gnutls/openpgp.h>

111

/* gnutls_certificate_set_openpgp_key_file(),

112

GNUTLS_OPENPGP_FMT_BASE64 */

113

/* gnutls_certificate_set_openpgp_key_file(),

114

GNUTLS_OPENPGP_FMT_BASE64 */

113

115

114

116

/* GPGME */

115

117

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

123

125

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

124

126

#define SECKEY "seckey.txt"

125

127

#define PUBKEY "pubkey.txt"

128

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

126

129

127

130

bool debug = false;

128

131

static const char mandos_protocol_version[] = "1";

130

133

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

131

134

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

132

135

char *connect_to = NULL;

136

const char *hookdir = HOOKDIR;

133

137

134

138

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

135

139

typedef struct server{

176

180

* "buffer_length" is how much is already used.

177

181

*/

178

182

size_t incbuffer(char **buffer, size_t buffer_length,

179

size_t buffer_capacity){

183

size_t buffer_capacity){

180

184

if(buffer_length + BUFFER_SIZE > buffer_capacity){

181

185

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

182

186

if(buffer == NULL){

188

192

}

189

193

190

194

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

191

int add_server(const char *ip, uint16_t port,

192

AvahiIfIndex if_index,

193

int af){

195

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

196

int af){

194

197

int ret;

195

198

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

196

199

if(new_server == NULL){

198

201

return -1;

199

202

}

200

203

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

201

.port = port,

202

.if_index = if_index,

203

.af = af };

204

.port = port,

205

.if_index = if_index,

206

.af = af };

204

207

if(new_server->ip == NULL){

205

208

perror_plus("strdup");

206

209

return -1;

228

231

/*

229

232

* Initialize GPGME.

230

233

*/

231

static bool init_gpgme(const char *seckey,

232

const char *pubkey, const char *tempdir){

234

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

235

const char *tempdir){

233

236

gpgme_error_t rc;

234

237

gpgme_engine_info_t engine_info;

235

238

250

253

251

254

rc = gpgme_data_new_from_fd(&pgp_data, fd);

252

255

if(rc != GPG_ERR_NO_ERROR){

253

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

256

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

257

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

254

258

gpgme_strsource(rc), gpgme_strerror(rc));

255

259

return false;

256

260

}

257

261

258

262

rc = gpgme_op_import(mc.ctx, pgp_data);

259

263

if(rc != GPG_ERR_NO_ERROR){

260

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

264

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

265

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

261

266

gpgme_strsource(rc), gpgme_strerror(rc));

262

267

return false;

263

268

}

271

276

}

272

277

273

278

if(debug){

274

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

279

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

280

"Initializing GPGME\n");

275

281

}

276

282

277

283

/* Init GPGME */

278

284

gpgme_check_version(NULL);

279

285

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

280

286

if(rc != GPG_ERR_NO_ERROR){

281

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

287

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

288

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

282

289

gpgme_strsource(rc), gpgme_strerror(rc));

283

290

return false;

284

291

}

286

293

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

287

294

rc = gpgme_get_engine_info(&engine_info);

288

295

if(rc != GPG_ERR_NO_ERROR){

289

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

296

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

297

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

290

298

gpgme_strsource(rc), gpgme_strerror(rc));

291

299

return false;

292

300

}

299

307

engine_info = engine_info->next;

300

308

}

301

309

if(engine_info == NULL){

302

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

310

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

311

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

303

312

return false;

304

313

}

305

314

306

315

/* Create new GPGME "context" */

307

316

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

308

317

if(rc != GPG_ERR_NO_ERROR){

309

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

310

gpgme_strsource(rc), gpgme_strerror(rc));

318

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

319

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

320

gpgme_strerror(rc));

311

321

return false;

312

322

}

313

323

332

342

ssize_t plaintext_length = 0;

333

343

334

344

if(debug){

335

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

345

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

346

"Trying to decrypt OpenPGP data\n");

336

347

}

337

348

338

349

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

339

350

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

340

351

0);

341

352

if(rc != GPG_ERR_NO_ERROR){

342

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

353

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

354

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

343

355

gpgme_strsource(rc), gpgme_strerror(rc));

344

356

return -1;

345

357

}

347

359

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

348

360

rc = gpgme_data_new(&dh_plain);

349

361

if(rc != GPG_ERR_NO_ERROR){

350

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

362

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

363

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

351

364

gpgme_strsource(rc), gpgme_strerror(rc));

352

365

gpgme_data_release(dh_crypto);

353

366

return -1;

357

370

data buffer */

358

371

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

359

372

if(rc != GPG_ERR_NO_ERROR){

360

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

373

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

374

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

361

375

gpgme_strsource(rc), gpgme_strerror(rc));

362

376

plaintext_length = -1;

363

377

if(debug){

364

378

gpgme_decrypt_result_t result;

365

379

result = gpgme_op_decrypt_result(mc.ctx);

366

380

if(result == NULL){

367

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

381

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

382

"gpgme_op_decrypt_result failed\n");

368

383

} else {

369

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

384

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

385

"Unsupported algorithm: %s\n",

370

386

result->unsupported_algorithm);

371

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

387

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

388

"Wrong key usage: %u\n",

372

389

result->wrong_key_usage);

373

390

if(result->file_name != NULL){

374

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

391

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

392

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

375

393

}

376

394

gpgme_recipient_t recipient;

377

395

recipient = result->recipients;

378

396

while(recipient != NULL){

379

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

397

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

398

"Public key algorithm: %s\n",

380

399

gpgme_pubkey_algo_name(recipient->pubkey_algo));

381

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

382

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

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",

383

404

recipient->status == GPG_ERR_NO_SECKEY

384

405

? "No" : "Yes");

385

406

recipient = recipient->next;

390

411

}

391

412

392

413

if(debug){

393

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

414

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

415

"Decryption of OpenPGP data succeeded\n");

394

416

}

395

417

396

418

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

403

425

*plaintext = NULL;

404

426

while(true){

405

427

plaintext_capacity = incbuffer(plaintext,

406

(size_t)plaintext_length,

407

plaintext_capacity);

428

(size_t)plaintext_length,

429

plaintext_capacity);

408

430

if(plaintext_capacity == 0){

409

perror_plus("incbuffer");

410

plaintext_length = -1;

411

goto decrypt_end;

431

perror_plus("incbuffer");

432

plaintext_length = -1;

433

goto decrypt_end;

412

434

}

413

435

414

436

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

427

449

}

428

450

429

451

if(debug){

430

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

452

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

453

"Decrypted password is: ");

431

454

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

432

455

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

433

456

}

455

478

/* GnuTLS log function callback */

456

479

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

457

480

const char* string){

458

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

481

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

459

482

}

460

483

461

484

static int init_gnutls_global(const char *pubkeyfilename,

463

486

int ret;

464

487

465

488

if(debug){

466

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

489

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

490

"Initializing GnuTLS\n");

467

491

}

468

492

469

493

ret = gnutls_global_init();

470

494

if(ret != GNUTLS_E_SUCCESS){

471

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

472

safer_gnutls_strerror(ret));

495

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

496

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

473

497

return -1;

474

498

}

475

499

484

508

/* OpenPGP credentials */

485

509

ret = gnutls_certificate_allocate_credentials(&mc.cred);

486

510

if(ret != GNUTLS_E_SUCCESS){

487

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

488

safer_gnutls_strerror(ret));

511

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

512

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

489

513

gnutls_global_deinit();

490

514

return -1;

491

515

}

492

516

493

517

if(debug){

494

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

518

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

519

"Attempting to use OpenPGP public key %s and"

495

520

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

496

521

seckeyfilename);

497

522

}

501

526

GNUTLS_OPENPGP_FMT_BASE64);

502

527

if(ret != GNUTLS_E_SUCCESS){

503

528

fprintf(stderr,

529

"Mandos plugin mandos-client: "

504

530

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

505

531

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

506

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

507

safer_gnutls_strerror(ret));

532

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

533

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

508

534

goto globalfail;

509

535

}

510

536

511

537

/* GnuTLS server initialization */

512

538

ret = gnutls_dh_params_init(&mc.dh_params);

513

539

if(ret != GNUTLS_E_SUCCESS){

514

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

540

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

541

"Error in GnuTLS DH parameter initialization:"

515

542

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

516

543

goto globalfail;

517

544

}

518

545

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

519

546

if(ret != GNUTLS_E_SUCCESS){

520

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

547

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

548

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

521

549

safer_gnutls_strerror(ret));

522

550

goto globalfail;

523

551

}

544

572

}

545

573

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

546

574

if(ret != GNUTLS_E_SUCCESS){

547

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

575

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

576

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

548

577

safer_gnutls_strerror(ret));

549

578

}

550

579

558

587

}

559

588

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

560

589

if(ret != GNUTLS_E_SUCCESS){

561

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

562

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

563

safer_gnutls_strerror(ret));

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));

564

594

gnutls_deinit(*session);

565

595

return -1;

566

596

}

575

605

}

576

606

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

577

607

if(ret != GNUTLS_E_SUCCESS){

578

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

608

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

609

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

579

610

safer_gnutls_strerror(ret));

580

611

gnutls_deinit(*session);

581

612

return -1;

627

658

pf = PF_INET;

628

659

break;

629

660

default:

630

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

661

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

662

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

631

663

errno = EINVAL;

632

664

return -1;

633

665

}

638

670

}

639

671

640

672

if(debug){

641

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

673

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

674

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

642

675

"\n", ip, port);

643

676

}

644

677

671

704

}

672

705

if(ret == 0){

673

706

int e = errno;

674

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

707

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

708

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

675

709

errno = e;

676

710

goto mandos_end;

677

711

}

682

716

683

717

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

684

718

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

685

-Wunreachable-code*/

719

-Wunreachable-code*/

686

720

if(if_index == AVAHI_IF_UNSPEC){

687

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

721

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

722

"An IPv6 link-local address is incomplete"

688

723

" without a network interface\n");

689

724

errno = EINVAL;

690

725

goto mandos_end;

709

744

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

710

745

perror_plus("if_indextoname");

711

746

} else {

712

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

747

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

748

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

713

749

ip, interface, port);

714

750

}

715

751

} else {

716

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

717

port);

752

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

753

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

718

754

}

719

755

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

720

756

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

730

766

perror_plus("inet_ntop");

731

767

} else {

732

768

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

733

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

769

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

770

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

734

771

}

735

772

}

736

773

}

764

801

while(true){

765

802

size_t out_size = strlen(out);

766

803

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

767

out_size - written));

804

out_size - written));

768

805

if(ret == -1){

769

806

int e = errno;

770

807

perror_plus("write");

790

827

}

791

828

792

829

if(debug){

793

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

830

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

831

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

794

832

}

795

833

796

834

if(quit_now){

816

854

817

855

if(ret != GNUTLS_E_SUCCESS){

818

856

if(debug){

819

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

857

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

858

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

820

859

gnutls_perror(ret);

821

860

}

822

861

errno = EPROTO;

826

865

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

827

866

828

867

if(debug){

829

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

830

ip);

868

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

869

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

831

870

}

832

871

833

872

while(true){

838

877

}

839

878

840

879

buffer_capacity = incbuffer(&buffer, buffer_length,

841

buffer_capacity);

880

buffer_capacity);

842

881

if(buffer_capacity == 0){

843

882

int e = errno;

844

883

perror_plus("incbuffer");

871

910

}

872

911

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

873

912

if(ret < 0){

874

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

913

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

914

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

875

915

gnutls_perror(ret);

876

916

errno = EPROTO;

877

917

goto mandos_end;

878

918

}

879

919

break;

880

920

default:

881

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

921

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

922

"Unknown error while reading data from"

882

923

" encrypted session with Mandos server\n");

883

924

gnutls_bye(session, GNUTLS_SHUT_RDWR);

884

925

errno = EIO;

890

931

}

891

932

892

933

if(debug){

893

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

934

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

935

"Closing TLS session\n");

894

936

}

895

937

896

938

if(quit_now){

908

950

909

951

if(buffer_length > 0){

910

952

ssize_t decrypted_buffer_size;

911

decrypted_buffer_size = pgp_packet_decrypt(buffer,

912

buffer_length,

953

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

913

954

&decrypted_buffer);

914

955

if(decrypted_buffer_size >= 0){

915

956

926

967

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

927

968

int e = errno;

928

969

if(debug){

929

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

970

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

971

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

930

972

strerror(errno));

931

973

}

932

974

errno = e;

990

1032

switch(event){

991

1033

default:

992

1034

case AVAHI_RESOLVER_FAILURE:

993

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

1035

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

1036

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

994

1037

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

995

1038

avahi_strerror(avahi_server_errno(mc.server)));

996

1039

break;

1000

1043

char ip[AVAHI_ADDRESS_STR_MAX];

1001

1044

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

1002

1045

if(debug){

1003

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

1046

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

1047

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

1004

1048

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

1005

1049

ip, (intmax_t)interface, port);

1006

1050

}

1040

1084

default:

1041

1085

case AVAHI_BROWSER_FAILURE:

1042

1086

1043

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

1087

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

1088

"(Avahi browser) %s\n",

1044

1089

avahi_strerror(avahi_server_errno(mc.server)));

1045

1090

avahi_simple_poll_quit(mc.simple_poll);

1046

1091

return;

1054

1099

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

1055

1100

name, type, domain, protocol, 0,

1056

1101

resolve_callback, NULL) == NULL)

1057

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

1102

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

1103

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

1058

1104

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

1059

1105

break;

1060

1106

1064

1110

case AVAHI_BROWSER_ALL_FOR_NOW:

1065

1111

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1066

1112

if(debug){

1067

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

1113

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

1114

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

1068

1115

}

1069

1116

break;

1070

1117

}

1085

1132

errno = old_errno;

1086

1133

}

1087

1134

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){

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){

1144

1146

if(debug){

1145

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

1146

flagstring, if_entry->d_name);

1147

perror_plus("ioctl SIOCGIFFLAGS");

1147

1148

}

1148

free(flagstring);

1149

return 0;

1149

return false;

1150

}

1151

free(flagstring);

1152

ifreq_flags flags = (ifreq_flags)tmpmax;

1151

return true;

1152

}

1153

1154

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

1155

1153

1156

/* Reject the loopback device */

1154

if(flags & IFF_LOOPBACK){

1157

if(ifr->ifr_flags & IFF_LOOPBACK){

1155

1158

if(debug){

1156

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

1157

if_entry->d_name);

1159

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

1160

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

1158

1161

}

1159

return 0;

1162

return false;

1160

1163

}

1161

1164

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

1162

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

1165

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

1163

1166

if(debug){

1164

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

1165

if_entry->d_name);

1167

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

1168

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

1166

1169

}

1167

return 1;

1170

return true;

1168

1171

}

1169

1172

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

1170

if(not (flags & IFF_BROADCAST)){

1173

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

1171

1174

if(debug){

1172

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

1173

if_entry->d_name);

1175

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

1176

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

1174

1177

}

1175

return 0;

1178

return false;

1176

1179

}

1177

1180

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

1178

if(flags & IFF_NOARP){

1181

if(ifr->ifr_flags & IFF_NOARP){

1179

1182

if(debug){

1180

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

1181

if_entry->d_name);

1183

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

1184

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

1182

1185

}

1183

return 0;

1186

return false;

1184

1187

}

1188

1185

1189

/* Accept this device */

1186

1190

if(debug){

1187

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

1188

if_entry->d_name);

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;

1189

1265

}

1190

1266

return 1;

1191

1267

}

1201

1277

return 1;

1202

1278

}

1203

1279

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

1204

1340

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1205

1341

int ret;

1206

1342

struct timespec now;

1210

1346

while(true){

1211

1347

if(mc.current_server == NULL){

1212

1348

if (debug){

1213

fprintf(stderr,

1349

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

1214

1350

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

1215

1351

}

1216

1352

ret = avahi_simple_poll_iterate(s, -1);

1217

1353

} else {

1218

1354

if (debug){

1219

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

1355

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

1356

"Check current_server if we should run it,"

1220

1357

" or wait\n");

1221

1358

}

1222

1359

/* the current time */

1239

1376

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

1240

1377

1241

1378

if (debug){

1242

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

1379

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

1380

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

1243

1381

}

1244

1382

1245

1383

if(block_time <= 0){

1265

1403

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

1266

1404

}

1267

1405

if(ret != 0){

1268

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

1406

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

1269

1407

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

1270

1408

}

1271

1409

}

1359

1497

.arg = "SECONDS",

1360

1498

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

1361

1499

.group = 2 },

1500

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

1501

.arg = "DIR",

1502

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

1503

.group = 2 },

1362

1504

/*

1363

1505

* These reproduce what we would get without ARGP_NO_HELP

1364

1506

*/

1417

1559

argp_error(state, "Bad retry interval");

1418

1560

}

1419

1561

break;

1562

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

1563

hookdir = arg;

1564

break;

1420

1565

/*

1421

1566

* These reproduce what we would get without ARGP_NO_HELP

1422

1567

*/

1428

1573

argp_state_help(state, state->out_stream,

1429

1574

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1430

1575

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

1576

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

1431

1577

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

1432

1578

exit(argp_err_exit_status);

1433

1579

break;

1518

1664

}

1519

1665

}

1520

1666

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

1521

1761

if(not debug){

1522

1762

avahi_set_log_function(empty_log);

1523

1763

}

1524

1764

1525

1765

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

1526

1766

struct dirent **direntries;

1527

ret = scandir(sys_class_net, &direntries, good_interface,

1767

/* First look for interfaces that are up */

1768

ret = scandir(sys_class_net, &direntries, up_interface,

1528

1769

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

}

1529

1776

if(ret >= 1){

1530

/* Pick the first good interface */

1777

/* Pick the first interface returned */

1531

1778

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

1532

1779

if(debug){

1533

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

1780

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

1781

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

1534

1782

}

1535

1783

if(interface == NULL){

1536

1784

perror_plus("malloc");

1541

1789

free(direntries);

1542

1790

} else {

1543

1791

free(direntries);

1544

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

1792

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

1793

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

1545

1794

exitcode = EXIT_FAILURE;

1546

1795

goto end;

1547

1796

}

1553

1802

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

1554

1803

mc.simple_poll = avahi_simple_poll_new();

1555

1804

if(mc.simple_poll == NULL){

1556

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

1805

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

1806

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

1557

1807

exitcode = EX_UNAVAILABLE;

1558

1808

goto end;

1559

1809

}

1625

1875

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

1626

1876

if_index = (AvahiIfIndex) if_nametoindex(interface);

1627

1877

if(if_index == 0){

1628

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

1878

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

1879

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

1629

1880

exitcode = EX_UNAVAILABLE;

1630

1881

goto end;

1631

1882

}

1772

2023

1773

2024

ret = init_gnutls_global(pubkey, seckey);

1774

2025

if(ret == -1){

1775

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

2026

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

2027

"init_gnutls_global failed\n");

1776

2028

exitcode = EX_UNAVAILABLE;

1777

2029

goto end;

1778

2030

} else {

1794

2046

}

1795

2047

1796

2048

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

1797

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

2049

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

2050

"init_gpgme failed\n");

1798

2051

exitcode = EX_UNAVAILABLE;

1799

2052

goto end;

1800

2053

} else {

1810

2063

/* (Mainly meant for debugging) */

1811

2064

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

1812

2065

if(address == NULL){

1813

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

2066

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

2067

"No colon in address\n");

1814

2068

exitcode = EX_USAGE;

1815

2069

goto end;

1816

2070

}

1824

2078

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

1825

2079

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

1826

2080

or tmpmax != (uint16_t)tmpmax){

1827

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

2081

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

2082

"Bad port number\n");

1828

2083

exitcode = EX_USAGE;

1829

2084

goto end;

1830

2085

}

1860

2115

break;

1861

2116

}

1862

2117

if(debug){

1863

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

1864

(int)retry_interval);

2118

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

2119

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

1865

2120

}

1866

2121

sleep((int)retry_interval);

1867

2122

}

1869

2124

if (not quit_now){

1870

2125

exitcode = EXIT_SUCCESS;

1871

2126

}

1872

2127

1873

2128

goto end;

1874

2129

}

1875

2130

1897

2152

1898

2153

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

1899

2154

if(mc.server == NULL){

1900

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

2155

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

2156

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

1901

2157

avahi_strerror(error));

1902

2158

exitcode = EX_UNAVAILABLE;

1903

2159

goto end;

1912

2168

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1913

2169

NULL, 0, browse_callback, NULL);

1914

2170

if(sb == NULL){

1915

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

2171

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

2172

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

1916

2173

avahi_strerror(avahi_server_errno(mc.server)));

1917

2174

exitcode = EX_UNAVAILABLE;

1918

2175

goto end;

1925

2182

/* Run the main loop */

1926

2183

1927

2184

if(debug){

1928

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

2185

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

2186

"Starting Avahi loop search\n");

1929

2187

}

1930

2188

1931

2189

ret = avahi_loop_with_timeout(mc.simple_poll,

1932

2190

(int)(retry_interval * 1000));

1933

2191

if(debug){

1934

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

2192

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

2193

"avahi_loop_with_timeout exited %s\n",

1935

2194

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

1936

2195

}

1937

2196

1938

2197

end:

1939

2198

1940

2199

if(debug){

1941

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

2200

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

2201

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

1942

2202

}

1943

2203

1944

2204

/* Cleanup things */

1972

2232

}

1973

2233

}

1974

2234

2235

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

2236

1975

2237

/* Take down the network interface */

1976

2238

if(take_down_interface){

1977

2239

/* Re-raise priviliges */

1984

2246

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

1985

2247

if(ret == -1){

1986

2248

perror_plus("ioctl SIOCGIFFLAGS");

1987

} else if(network.ifr_flags & IFF_UP) {

2249

} else if(network.ifr_flags & IFF_UP){

1988

2250

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

1989

2251

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

1990

2252

if(ret == -1){

2022

2284

}

2023

2285

ret = remove(fullname);

2024

2286

if(ret == -1){

2025

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

2026

strerror(errno));

2287

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

2288

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

2027

2289

}

2028

2290

free(fullname);

2029

2291

}