/mandos/release : revision 237.16.3

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() */

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";

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 */

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

}

684

718

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

685

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

}

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){

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){

926

968

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

927

969

int e = errno;

928

970

if(debug){

929

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

971

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

972

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

930

973

strerror(errno));

931

974

}

932

975

errno = e;

990

1033

switch(event){

991

1034

default:

992

1035

case AVAHI_RESOLVER_FAILURE:

993

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

1036

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

1037

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

994

1038

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

995

1039

avahi_strerror(avahi_server_errno(mc.server)));

996

1040

break;

1000

1044

char ip[AVAHI_ADDRESS_STR_MAX];

1001

1045

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

1002

1046

if(debug){

1003

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

1047

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

1048

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

1004

1049

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

1005

1050

ip, (intmax_t)interface, port);

1006

1051

}

1040

1085

default:

1041

1086

case AVAHI_BROWSER_FAILURE:

1042

1087

1043

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

1088

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

1089

"(Avahi browser) %s\n",

1044

1090

avahi_strerror(avahi_server_errno(mc.server)));

1045

1091

avahi_simple_poll_quit(mc.simple_poll);

1046

1092

return;

1054

1100

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

1055

1101

name, type, domain, protocol, 0,

1056

1102

resolve_callback, NULL) == NULL)

1057

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

1103

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

1104

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

1058

1105

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

1059

1106

break;

1060

1107

1064

1111

case AVAHI_BROWSER_ALL_FOR_NOW:

1065

1112

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1066

1113

if(debug){

1067

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

1114

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

1115

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

1068

1116

}

1069

1117

break;

1070

1118

}

1085

1133

errno = old_errno;

1086

1134

}

1087

1135

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){

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){

1144

1147

if(debug){

1145

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

1146

flagstring, if_entry->d_name);

1148

perror_plus("ioctl SIOCGIFFLAGS");

1147

1149

}

1148

free(flagstring);

1149

return 0;

1150

return false;

1150

1151

}

1151

free(flagstring);

1152

ifreq_flags flags = (ifreq_flags)tmpmax;

1152

return true;

1153

}

1154

1155

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

1156

1153

1157

/* Reject the loopback device */

1154

if(flags & IFF_LOOPBACK){

1158

if(ifr->ifr_flags & IFF_LOOPBACK){

1155

1159

if(debug){

1156

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

1157

if_entry->d_name);

1160

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

1161

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

1158

1162

}

1159

return 0;

1163

return false;

1160

1164

}

1161

1165

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

1162

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

1166

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

1163

1167

if(debug){

1164

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

1165

if_entry->d_name);

1168

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

1169

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

1166

1170

}

1167

return 1;

1171

return true;

1168

1172

}

1169

1173

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

1170

if(not (flags & IFF_BROADCAST)){

1174

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

1171

1175

if(debug){

1172

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

1173

if_entry->d_name);

1176

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

1177

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

1174

1178

}

1175

return 0;

1179

return false;

1176

1180

}

1177

1181

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

1178

if(flags & IFF_NOARP){

1182

if(ifr->ifr_flags & IFF_NOARP){

1179

1183

if(debug){

1180

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

1181

if_entry->d_name);

1184

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

1185

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

1182

1186

}

1183

return 0;

1187

return false;

1184

1188

}

1189

1185

1190

/* Accept this device */

1186

1191

if(debug){

1187

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

1188

if_entry->d_name);

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;

1189

1266

}

1190

1267

return 1;

1191

1268

}

1201

1278

return 1;

1202

1279

}

1203

1280

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

1204

1325

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1205

1326

int ret;

1206

1327

struct timespec now;

1210

1331

while(true){

1211

1332

if(mc.current_server == NULL){

1212

1333

if (debug){

1213

fprintf(stderr,

1334

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

1214

1335

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

1215

1336

}

1216

1337

ret = avahi_simple_poll_iterate(s, -1);

1217

1338

} else {

1218

1339

if (debug){

1219

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

1340

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

1341

"Check current_server if we should run it,"

1220

1342

" or wait\n");

1221

1343

}

1222

1344

/* the current time */

1239

1361

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

1240

1362

1241

1363

if (debug){

1242

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

1364

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

1365

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

1243

1366

}

1244

1367

1245

1368

if(block_time <= 0){

1265

1388

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

1266

1389

}

1267

1390

if(ret != 0){

1268

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

1391

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

1269

1392

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

1270

1393

}

1271

1394

}

1428

1551

argp_state_help(state, state->out_stream,

1429

1552

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1430

1553

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

1554

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

1431

1555

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

1432

1556

exit(argp_err_exit_status);

1433

1557

break;

1518

1642

}

1519

1643

}

1520

1644

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

1521

1740

if(not debug){

1522

1741

avahi_set_log_function(empty_log);

1523

1742

}

1524

1743

1525

1744

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

1526

1745

struct dirent **direntries;

1527

ret = scandir(sys_class_net, &direntries, good_interface,

1746

/* First look for interfaces that are up */

1747

ret = scandir(sys_class_net, &direntries, up_interface,

1528

1748

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

}

1529

1755

if(ret >= 1){

1530

/* Pick the first good interface */

1756

/* Pick the first interface returned */

1531

1757

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

1532

1758

if(debug){

1533

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

1759

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

1760

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

1534

1761

}

1535

1762

if(interface == NULL){

1536

1763

perror_plus("malloc");

1541

1768

free(direntries);

1542

1769

} else {

1543

1770

free(direntries);

1544

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

1771

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

1772

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

1545

1773

exitcode = EXIT_FAILURE;

1546

1774

goto end;

1547

1775

}

1553

1781

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

1554

1782

mc.simple_poll = avahi_simple_poll_new();

1555

1783

if(mc.simple_poll == NULL){

1556

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

1784

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

1785

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

1557

1786

exitcode = EX_UNAVAILABLE;

1558

1787

goto end;

1559

1788

}

1625

1854

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

1626

1855

if_index = (AvahiIfIndex) if_nametoindex(interface);

1627

1856

if(if_index == 0){

1628

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

1857

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

1858

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

1629

1859

exitcode = EX_UNAVAILABLE;

1630

1860

goto end;

1631

1861

}

1772

2002

1773

2003

ret = init_gnutls_global(pubkey, seckey);

1774

2004

if(ret == -1){

1775

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

2005

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

2006

"init_gnutls_global failed\n");

1776

2007

exitcode = EX_UNAVAILABLE;

1777

2008

goto end;

1778

2009

} else {

1794

2025

}

1795

2026

1796

2027

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

1797

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

2028

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

2029

"init_gpgme failed\n");

1798

2030

exitcode = EX_UNAVAILABLE;

1799

2031

goto end;

1800

2032

} else {

1810

2042

/* (Mainly meant for debugging) */

1811

2043

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

1812

2044

if(address == NULL){

1813

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

2045

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

2046

"No colon in address\n");

1814

2047

exitcode = EX_USAGE;

1815

2048

goto end;

1816

2049

}

1824

2057

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

1825

2058

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

1826

2059

or tmpmax != (uint16_t)tmpmax){

1827

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

2060

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

2061

"Bad port number\n");

1828

2062

exitcode = EX_USAGE;

1829

2063

goto end;

1830

2064

}

1860

2094

break;

1861

2095

}

1862

2096

if(debug){

1863

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

1864

(int)retry_interval);

2097

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

2098

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

1865

2099

}

1866

2100

sleep((int)retry_interval);

1867

2101

}

1869

2103

if (not quit_now){

1870

2104

exitcode = EXIT_SUCCESS;

1871

2105

}

1872

2106

1873

2107

goto end;

1874

2108

}

1875

2109

1897

2131

1898

2132

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

1899

2133

if(mc.server == NULL){

1900

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

2134

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

2135

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

1901

2136

avahi_strerror(error));

1902

2137

exitcode = EX_UNAVAILABLE;

1903

2138

goto end;

1912

2147

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1913

2148

NULL, 0, browse_callback, NULL);

1914

2149

if(sb == NULL){

1915

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

2150

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

2151

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

1916

2152

avahi_strerror(avahi_server_errno(mc.server)));

1917

2153

exitcode = EX_UNAVAILABLE;

1918

2154

goto end;

1925

2161

/* Run the main loop */

1926

2162

1927

2163

if(debug){

1928

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

2164

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

2165

"Starting Avahi loop search\n");

1929

2166

}

1930

2167

1931

2168

ret = avahi_loop_with_timeout(mc.simple_poll,

1932

2169

(int)(retry_interval * 1000));

1933

2170

if(debug){

1934

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

2171

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

2172

"avahi_loop_with_timeout exited %s\n",

1935

2173

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

1936

2174

}

1937

2175

1938

2176

end:

1939

2177

1940

2178

if(debug){

1941

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

2179

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

2180

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

1942

2181

}

1943

2182

1944

2183

/* Cleanup things */

1972

2211

}

1973

2212

}

1974

2213

2214

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

2215

1975

2216

/* Take down the network interface */

1976

2217

if(take_down_interface){

1977

2218

/* Re-raise priviliges */

1984

2225

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

1985

2226

if(ret == -1){

1986

2227

perror_plus("ioctl SIOCGIFFLAGS");

1987

} else if(network.ifr_flags & IFF_UP) {

2228

} else if(network.ifr_flags & IFF_UP){

1988

2229

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

1989

2230

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

1990

2231

if(ret == -1){

2022

2263

}

2023

2264

ret = remove(fullname);

2024

2265

if(ret == -1){

2025

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

2026

strerror(errno));

2266

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

2267

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

2027

2268

}

2028

2269

free(fullname);

2029

2270

}