/mandos/release : revision 237.11.6

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() */

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";

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 */

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

}

718

684

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

719

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

}

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){

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){

968

926

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

969

927

int e = errno;

970

928

if(debug){

971

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

972

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

929

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

973

930

strerror(errno));

974

931

}

975

932

errno = e;

1033

990

switch(event){

1034

991

default:

1035

992

case AVAHI_RESOLVER_FAILURE:

1036

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

1037

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

993

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

1038

994

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

1039

995

avahi_strerror(avahi_server_errno(mc.server)));

1040

996

break;

1044

1000

char ip[AVAHI_ADDRESS_STR_MAX];

1045

1001

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

1046

1002

if(debug){

1047

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

1048

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

1003

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

1049

1004

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

1050

1005

ip, (intmax_t)interface, port);

1051

1006

}

1085

1040

default:

1086

1041

case AVAHI_BROWSER_FAILURE:

1087

1042

1088

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

1089

"(Avahi browser) %s\n",

1043

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

1090

1044

avahi_strerror(avahi_server_errno(mc.server)));

1091

1045

avahi_simple_poll_quit(mc.simple_poll);

1092

1046

return;

1100

1054

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

1101

1055

name, type, domain, protocol, 0,

1102

1056

resolve_callback, NULL) == NULL)

1103

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

1104

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

1057

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

1105

1058

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

1106

1059

break;

1107

1060

1111

1064

case AVAHI_BROWSER_ALL_FOR_NOW:

1112

1065

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1113

1066

if(debug){

1114

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

1115

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

1067

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

1116

1068

}

1117

1069

break;

1118

1070

}

1133

1085

errno = old_errno;

1134

1086

}

1135

1087

1136

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

1137

int ret;

1138

1139

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

1140

if(s < 0){

1141

perror_plus("socket");

1142

return false;

1143

}

1144

strcpy(ifr->ifr_name, ifname);

1145

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1146

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){

1147

1144

if(debug){

1148

perror_plus("ioctl SIOCGIFFLAGS");

1145

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

1146

flagstring, if_entry->d_name);

1149

1147

}

1150

return false;

1148

free(flagstring);

1149

return 0;

1151

1150

}

1152

return true;

1153

}

1154

1155

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

1156

1151

free(flagstring);

1152

ifreq_flags flags = (ifreq_flags)tmpmax;

1157

1153

/* Reject the loopback device */

1158

if(ifr->ifr_flags & IFF_LOOPBACK){

1154

if(flags & IFF_LOOPBACK){

1159

1155

if(debug){

1160

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

1161

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

1156

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

1157

if_entry->d_name);

1162

1158

}

1163

return false;

1159

return 0;

1164

1160

}

1165

1161

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

1166

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

1162

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

1167

1163

if(debug){

1168

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

1169

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

1164

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

1165

if_entry->d_name);

1170

1166

}

1171

return true;

1167

return 1;

1172

1168

}

1173

1169

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

1174

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

1170

if(not (flags & IFF_BROADCAST)){

1175

1171

if(debug){

1176

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

1177

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

1172

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

1173

if_entry->d_name);

1178

1174

}

1179

return false;

1175

return 0;

1180

1176

}

1181

1177

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

1182

if(ifr->ifr_flags & IFF_NOARP){

1178

if(flags & IFF_NOARP){

1183

1179

if(debug){

1184

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

1185

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

1180

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

1181

if_entry->d_name);

1186

1182

}

1187

return false;

1183

return 0;

1188

1184

}

1189

1190

1185

/* Accept this device */

1191

1186

if(debug){

1192

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

1193

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

1194

}

1195

return true;

1196

}

1197

1198

/*

1199

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

1200

* corresponds to an acceptable network device.

1201

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

1202

*/

1203

int good_interface(const struct dirent *if_entry){

1204

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

1205

return 0;

1206

}

1207

1208

struct ifreq ifr;

1209

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

1210

if(debug){

1211

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

1212

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

1213

if_entry->d_name);

1214

}

1215

return 0;

1216

}

1217

1218

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

1219

return 0;

1220

}

1221

return 1;

1222

}

1223

1224

/*

1225

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

1226

* corresponds to an acceptable network device which is up.

1227

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

1228

*/

1229

int up_interface(const struct dirent *if_entry){

1230

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

1231

return 0;

1232

}

1233

1234

struct ifreq ifr;

1235

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

1236

if(debug){

1237

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

1238

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

1239

if_entry->d_name);

1240

}

1241

return 0;

1242

}

1243

1244

/* Reject down interfaces */

1245

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

1246

if(debug){

1247

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

1248

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

1249

if_entry->d_name);

1250

}

1251

return 0;

1252

}

1253

1254

/* Reject non-running interfaces */

1255

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

1256

if(debug){

1257

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

1258

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

1259

if_entry->d_name);

1260

}

1261

return 0;

1262

}

1263

1264

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

1265

return 0;

1187

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

1188

if_entry->d_name);

1266

1189

}

1267

1190

return 1;

1268

1191

}

1278

1201

return 1;

1279

1202

}

1280

1203

1281

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

1282

int runnable_hook(const struct dirent *direntry){

1283

int ret;

1284

struct stat st;

1285

1286

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

1287

/* Empty name? */

1288

return 0;

1289

}

1290

1291

/* Save pointer to last character */

1292

char *end = strchr(direntry->d_name, '\0')-1;

1293

1294

if(*end == '~'){

1295

/* Backup name~ */

1296

return 0;

1297

}

1298

1299

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

1300

and (*end == '#')){

1301

/* Temporary #name# */

1302

return 0;

1303

}

1304

1305

/* XXX more rules here */

1306

1307

ret = stat(direntry->d_name, &st);

1308

if(ret == -1){

1309

if(debug){

1310

perror_plus("Could not stat plugin");

1311

}

1312

return 0;

1313

}

1314

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

1315

/* Not a regular file */

1316

return 0;

1317

}

1318

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

1319

/* Not executable */

1320

return 0;

1321

}

1322

return 1;

1323

}

1324

1325

1204

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1326

1205

int ret;

1327

1206

struct timespec now;

1331

1210

while(true){

1332

1211

if(mc.current_server == NULL){

1333

1212

if (debug){

1334

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

1213

fprintf(stderr,

1335

1214

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

1336

1215

}

1337

1216

ret = avahi_simple_poll_iterate(s, -1);

1338

1217

} else {

1339

1218

if (debug){

1340

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

1341

"Check current_server if we should run it,"

1219

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

1342

1220

" or wait\n");

1343

1221

}

1344

1222

/* the current time */

1361

1239

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

1362

1240

1363

1241

if (debug){

1364

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

1365

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

1242

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

1366

1243

}

1367

1244

1368

1245

if(block_time <= 0){

1388

1265

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

1389

1266

}

1390

1267

if(ret != 0){

1391

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

1268

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

1392

1269

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

1393

1270

}

1394

1271

}

1551

1428

argp_state_help(state, state->out_stream,

1552

1429

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1553

1430

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

1554

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

1555

1431

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

1556

1432

exit(argp_err_exit_status);

1557

1433

break;

1642

1518

}

1643

1519

}

1644

1520

1645

/* Find network hooks and run them */

1646

{

1647

struct dirent **direntries;

1648

struct dirent *direntry;

1649

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

1650

alphasort);

1651

if(numhooks == -1){

1652

perror_plus("scandir");

1653

} else {

1654

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

1655

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

1656

direntry = direntries[0];

1657

char *fullname = NULL;

1658

ret = asprintf(&fullname, "%s/%s", tempdir,

1659

direntry->d_name);

1660

if(ret < 0){

1661

perror_plus("asprintf");

1662

continue;

1663

}

1664

pid_t hook_pid = fork();

1665

if(hook_pid == 0){

1666

/* Child */

1667

dup2(devnull, STDIN_FILENO);

1668

close(devnull);

1669

dup2(STDERR_FILENO, STDOUT_FILENO);

1670

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

1671

if(ret == -1){

1672

perror_plus("setenv");

1673

exit(1);

1674

}

1675

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

1676

if(ret == -1){

1677

perror_plus("setenv");

1678

exit(1);

1679

}

1680

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

1681

if(ret == -1){

1682

perror_plus("setenv");

1683

exit(1);

1684

}

1685

char *delaystring;

1686

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

1687

if(ret == -1){

1688

perror_plus("asprintf");

1689

exit(1);

1690

}

1691

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

1692

if(ret == -1){

1693

free(delaystring);

1694

perror_plus("setenv");

1695

exit(1);

1696

}

1697

free(delaystring);

1698

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

1699

perror_plus("execl");

1700

} else {

1701

int status;

1702

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

1703

perror_plus("waitpid");

1704

free(fullname);

1705

continue;

1706

}

1707

if(WIFEXITED(status)){

1708

if(WEXITSTATUS(status) != 0){

1709

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

1710

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

1711

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

1712

WEXITSTATUS(status));

1713

free(fullname);

1714

continue;

1715

}

1716

} else if(WIFSIGNALED(status)){

1717

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

1718

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

1719

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

1720

WTERMSIG(status));

1721

free(fullname);

1722

continue;

1723

} else {

1724

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

1725

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

1726

direntry->d_name);

1727

free(fullname);

1728

continue;

1729

}

1730

}

1731

free(fullname);

1732

if(quit_now){

1733

goto end;

1734

}

1735

}

1736

close(devnull);

1737

}

1738

}

1739

1740

1521

if(not debug){

1741

1522

avahi_set_log_function(empty_log);

1742

1523

}

1743

1524

1744

1525

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

1745

1526

struct dirent **direntries;

1746

/* First look for interfaces that are up */

1747

ret = scandir(sys_class_net, &direntries, up_interface,

1527

ret = scandir(sys_class_net, &direntries, good_interface,

1748

1528

alphasort);

1749

if(ret == 0){

1750

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

1751

free(direntries);

1752

ret = scandir(sys_class_net, &direntries, good_interface,

1753

alphasort);

1754

}

1755

1529

if(ret >= 1){

1756

/* Pick the first interface returned */

1530

/* Pick the first good interface */

1757

1531

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

1758

1532

if(debug){

1759

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

1760

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

1533

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

1761

1534

}

1762

1535

if(interface == NULL){

1763

1536

perror_plus("malloc");

1768

1541

free(direntries);

1769

1542

} else {

1770

1543

free(direntries);

1771

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

1772

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

1544

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

1773

1545

exitcode = EXIT_FAILURE;

1774

1546

goto end;

1775

1547

}

1781

1553

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

1782

1554

mc.simple_poll = avahi_simple_poll_new();

1783

1555

if(mc.simple_poll == NULL){

1784

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

1785

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

1556

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

1786

1557

exitcode = EX_UNAVAILABLE;

1787

1558

goto end;

1788

1559

}

1854

1625

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

1855

1626

if_index = (AvahiIfIndex) if_nametoindex(interface);

1856

1627

if(if_index == 0){

1857

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

1858

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

1628

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

1859

1629

exitcode = EX_UNAVAILABLE;

1860

1630

goto end;

1861

1631

}

2002

1772

2003

1773

ret = init_gnutls_global(pubkey, seckey);

2004

1774

if(ret == -1){

2005

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

2006

"init_gnutls_global failed\n");

1775

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

2007

1776

exitcode = EX_UNAVAILABLE;

2008

1777

goto end;

2009

1778

} else {

2025

1794

}

2026

1795

2027

1796

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

2028

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

2029

"init_gpgme failed\n");

1797

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

2030

1798

exitcode = EX_UNAVAILABLE;

2031

1799

goto end;

2032

1800

} else {

2042

1810

/* (Mainly meant for debugging) */

2043

1811

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

2044

1812

if(address == NULL){

2045

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

2046

"No colon in address\n");

1813

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

2047

1814

exitcode = EX_USAGE;

2048

1815

goto end;

2049

1816

}

2057

1824

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

2058

1825

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

2059

1826

or tmpmax != (uint16_t)tmpmax){

2060

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

2061

"Bad port number\n");

1827

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

2062

1828

exitcode = EX_USAGE;

2063

1829

goto end;

2064

1830

}

2094

1860

break;

2095

1861

}

2096

1862

if(debug){

2097

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

2098

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

1863

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

1864

(int)retry_interval);

2099

1865

}

2100

1866

sleep((int)retry_interval);

2101

1867

}

2103

1869

if (not quit_now){

2104

1870

exitcode = EXIT_SUCCESS;

2105

1871

}

2106

1872

2107

1873

goto end;

2108

1874

}

2109

1875

2131

1897

2132

1898

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

2133

1899

if(mc.server == NULL){

2134

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

2135

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

1900

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

2136

1901

avahi_strerror(error));

2137

1902

exitcode = EX_UNAVAILABLE;

2138

1903

goto end;

2147

1912

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2148

1913

NULL, 0, browse_callback, NULL);

2149

1914

if(sb == NULL){

2150

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

2151

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

1915

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

2152

1916

avahi_strerror(avahi_server_errno(mc.server)));

2153

1917

exitcode = EX_UNAVAILABLE;

2154

1918

goto end;

2161

1925

/* Run the main loop */

2162

1926

2163

1927

if(debug){

2164

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

2165

"Starting Avahi loop search\n");

1928

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

2166

1929

}

2167

1930

2168

1931

ret = avahi_loop_with_timeout(mc.simple_poll,

2169

1932

(int)(retry_interval * 1000));

2170

1933

if(debug){

2171

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

2172

"avahi_loop_with_timeout exited %s\n",

1934

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

2173

1935

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

2174

1936

}

2175

1937

2176

1938

end:

2177

1939

2178

1940

if(debug){

2179

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

2180

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

1941

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

2181

1942

}

2182

1943

2183

1944

/* Cleanup things */

2211

1972

}

2212

1973

}

2213

1974

2214

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

2215

2216

1975

/* Take down the network interface */

2217

1976

if(take_down_interface){

2218

1977

/* Re-raise priviliges */

2225

1984

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

2226

1985

if(ret == -1){

2227

1986

perror_plus("ioctl SIOCGIFFLAGS");

2228

} else if(network.ifr_flags & IFF_UP){

1987

} else if(network.ifr_flags & IFF_UP) {

2229

1988

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

2230

1989

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

2231

1990

if(ret == -1){

2263

2022

}

2264

2023

ret = remove(fullname);

2265

2024

if(ret == -1){

2266

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

2267

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

2025

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

2026

strerror(errno));

2268

2027

}

2269

2028

free(fullname);

2270

2029

}