/mandos/release : revision 237.16.4

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";

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{

250

254

251

255

rc = gpgme_data_new_from_fd(&pgp_data, fd);

252

256

if(rc != GPG_ERR_NO_ERROR){

253

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

257

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

258

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

254

259

gpgme_strsource(rc), gpgme_strerror(rc));

255

260

return false;

256

261

}

257

262

258

263

rc = gpgme_op_import(mc.ctx, pgp_data);

259

264

if(rc != GPG_ERR_NO_ERROR){

260

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

265

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

266

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

261

267

gpgme_strsource(rc), gpgme_strerror(rc));

262

268

return false;

263

269

}

271

277

}

272

278

273

279

if(debug){

274

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

280

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

281

"Initializing GPGME\n");

275

282

}

276

283

277

284

/* Init GPGME */

278

285

gpgme_check_version(NULL);

279

286

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

280

287

if(rc != GPG_ERR_NO_ERROR){

281

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

288

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

289

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

282

290

gpgme_strsource(rc), gpgme_strerror(rc));

283

291

return false;

284

292

}

286

294

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

287

295

rc = gpgme_get_engine_info(&engine_info);

288

296

if(rc != GPG_ERR_NO_ERROR){

289

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

297

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

298

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

290

299

gpgme_strsource(rc), gpgme_strerror(rc));

291

300

return false;

292

301

}

299

308

engine_info = engine_info->next;

300

309

}

301

310

if(engine_info == NULL){

302

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

311

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

312

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

303

313

return false;

304

314

}

305

315

306

316

/* Create new GPGME "context" */

307

317

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

308

318

if(rc != GPG_ERR_NO_ERROR){

309

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

310

gpgme_strsource(rc), gpgme_strerror(rc));

319

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

320

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

321

gpgme_strerror(rc));

311

322

return false;

312

323

}

313

324

332

343

ssize_t plaintext_length = 0;

333

344

334

345

if(debug){

335

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

346

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

347

"Trying to decrypt OpenPGP data\n");

336

348

}

337

349

338

350

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

339

351

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

340

352

0);

341

353

if(rc != GPG_ERR_NO_ERROR){

342

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

354

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

355

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

343

356

gpgme_strsource(rc), gpgme_strerror(rc));

344

357

return -1;

345

358

}

347

360

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

348

361

rc = gpgme_data_new(&dh_plain);

349

362

if(rc != GPG_ERR_NO_ERROR){

350

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

363

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

364

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

351

365

gpgme_strsource(rc), gpgme_strerror(rc));

352

366

gpgme_data_release(dh_crypto);

353

367

return -1;

357

371

data buffer */

358

372

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

359

373

if(rc != GPG_ERR_NO_ERROR){

360

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

374

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

375

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

361

376

gpgme_strsource(rc), gpgme_strerror(rc));

362

377

plaintext_length = -1;

363

378

if(debug){

364

379

gpgme_decrypt_result_t result;

365

380

result = gpgme_op_decrypt_result(mc.ctx);

366

381

if(result == NULL){

367

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

382

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

383

"gpgme_op_decrypt_result failed\n");

368

384

} else {

369

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

385

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

386

"Unsupported algorithm: %s\n",

370

387

result->unsupported_algorithm);

371

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

388

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

389

"Wrong key usage: %u\n",

372

390

result->wrong_key_usage);

373

391

if(result->file_name != NULL){

374

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

392

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

393

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

375

394

}

376

395

gpgme_recipient_t recipient;

377

396

recipient = result->recipients;

378

397

while(recipient != NULL){

379

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

398

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

399

"Public key algorithm: %s\n",

380

400

gpgme_pubkey_algo_name(recipient->pubkey_algo));

381

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

382

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

401

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

402

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

403

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

404

"Secret key available: %s\n",

383

405

recipient->status == GPG_ERR_NO_SECKEY

384

406

? "No" : "Yes");

385

407

recipient = recipient->next;

390

412

}

391

413

392

414

if(debug){

393

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

415

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

416

"Decryption of OpenPGP data succeeded\n");

394

417

}

395

418

396

419

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

427

450

}

428

451

429

452

if(debug){

430

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

453

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

454

"Decrypted password is: ");

431

455

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

432

456

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

433

457

}

455

479

/* GnuTLS log function callback */

456

480

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

457

481

const char* string){

458

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

482

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

459

483

}

460

484

461

485

static int init_gnutls_global(const char *pubkeyfilename,

463

487

int ret;

464

488

465

489

if(debug){

466

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

490

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

491

"Initializing GnuTLS\n");

467

492

}

468

493

469

494

ret = gnutls_global_init();

470

495

if(ret != GNUTLS_E_SUCCESS){

471

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

472

safer_gnutls_strerror(ret));

496

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

497

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

473

498

return -1;

474

499

}

475

500

484

509

/* OpenPGP credentials */

485

510

ret = gnutls_certificate_allocate_credentials(&mc.cred);

486

511

if(ret != GNUTLS_E_SUCCESS){

487

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

488

safer_gnutls_strerror(ret));

512

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

513

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

489

514

gnutls_global_deinit();

490

515

return -1;

491

516

}

492

517

493

518

if(debug){

494

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

519

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

520

"Attempting to use OpenPGP public key %s and"

495

521

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

496

522

seckeyfilename);

497

523

}

501

527

GNUTLS_OPENPGP_FMT_BASE64);

502

528

if(ret != GNUTLS_E_SUCCESS){

503

529

fprintf(stderr,

530

"Mandos plugin mandos-client: "

504

531

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

505

532

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

506

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

507

safer_gnutls_strerror(ret));

533

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

534

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

508

535

goto globalfail;

509

536

}

510

537

511

538

/* GnuTLS server initialization */

512

539

ret = gnutls_dh_params_init(&mc.dh_params);

513

540

if(ret != GNUTLS_E_SUCCESS){

514

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

541

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

542

"Error in GnuTLS DH parameter initialization:"

515

543

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

516

544

goto globalfail;

517

545

}

518

546

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

519

547

if(ret != GNUTLS_E_SUCCESS){

520

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

548

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

549

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

521

550

safer_gnutls_strerror(ret));

522

551

goto globalfail;

523

552

}

544

573

}

545

574

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

546

575

if(ret != GNUTLS_E_SUCCESS){

547

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

576

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

577

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

548

578

safer_gnutls_strerror(ret));

549

579

}

550

580

558

588

}

559

589

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

560

590

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));

591

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

592

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

593

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

594

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

564

595

gnutls_deinit(*session);

565

596

return -1;

566

597

}

575

606

}

576

607

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

577

608

if(ret != GNUTLS_E_SUCCESS){

578

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

609

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

610

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

579

611

safer_gnutls_strerror(ret));

580

612

gnutls_deinit(*session);

581

613

return -1;

627

659

pf = PF_INET;

628

660

break;

629

661

default:

630

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

662

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

663

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

631

664

errno = EINVAL;

632

665

return -1;

633

666

}

638

671

}

639

672

640

673

if(debug){

641

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

674

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

675

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

642

676

"\n", ip, port);

643

677

}

644

678

671

705

}

672

706

if(ret == 0){

673

707

int e = errno;

674

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

708

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

709

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

675

710

errno = e;

676

711

goto mandos_end;

677

712

}

684

719

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

685

720

-Wunreachable-code*/

686

721

if(if_index == AVAHI_IF_UNSPEC){

687

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

722

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

723

"An IPv6 link-local address is incomplete"

688

724

" without a network interface\n");

689

725

errno = EINVAL;

690

726

goto mandos_end;

709

745

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

710

746

perror_plus("if_indextoname");

711

747

} else {

712

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

748

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

749

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

713

750

ip, interface, port);

714

751

}

715

752

} else {

716

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

717

port);

753

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

754

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

718

755

}

719

756

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

720

757

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

730

767

perror_plus("inet_ntop");

731

768

} else {

732

769

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

733

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

770

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

771

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

734

772

}

735

773

}

736

774

}

790

828

}

791

829

792

830

if(debug){

793

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

831

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

832

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

794

833

}

795

834

796

835

if(quit_now){

816

855

817

856

if(ret != GNUTLS_E_SUCCESS){

818

857

if(debug){

819

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

858

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

859

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

820

860

gnutls_perror(ret);

821

861

}

822

862

errno = EPROTO;

826

866

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

827

867

828

868

if(debug){

829

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

830

ip);

869

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

870

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

831

871

}

832

872

833

873

while(true){

871

911

}

872

912

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

873

913

if(ret < 0){

874

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

914

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

915

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

875

916

gnutls_perror(ret);

876

917

errno = EPROTO;

877

918

goto mandos_end;

878

919

}

879

920

break;

880

921

default:

881

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

922

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

923

"Unknown error while reading data from"

882

924

" encrypted session with Mandos server\n");

883

925

gnutls_bye(session, GNUTLS_SHUT_RDWR);

884

926

errno = EIO;

890

932

}

891

933

892

934

if(debug){

893

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

935

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

936

"Closing TLS session\n");

894

937

}

895

938

896

939

if(quit_now){

926

969

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

927

970

int e = errno;

928

971

if(debug){

929

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

972

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

973

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

930

974

strerror(errno));

931

975

}

932

976

errno = e;

990

1034

switch(event){

991

1035

default:

992

1036

case AVAHI_RESOLVER_FAILURE:

993

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

1037

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

1038

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

994

1039

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

995

1040

avahi_strerror(avahi_server_errno(mc.server)));

996

1041

break;

1000

1045

char ip[AVAHI_ADDRESS_STR_MAX];

1001

1046

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

1002

1047

if(debug){

1003

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

1048

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

1049

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

1004

1050

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

1005

1051

ip, (intmax_t)interface, port);

1006

1052

}

1040

1086

default:

1041

1087

case AVAHI_BROWSER_FAILURE:

1042

1088

1043

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

1089

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

1090

"(Avahi browser) %s\n",

1044

1091

avahi_strerror(avahi_server_errno(mc.server)));

1045

1092

avahi_simple_poll_quit(mc.simple_poll);

1046

1093

return;

1054

1101

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

1055

1102

name, type, domain, protocol, 0,

1056

1103

resolve_callback, NULL) == NULL)

1057

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

1104

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

1105

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

1058

1106

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

1059

1107

break;

1060

1108

1064

1112

case AVAHI_BROWSER_ALL_FOR_NOW:

1065

1113

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1066

1114

if(debug){

1067

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

1115

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

1116

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

1068

1117

}

1069

1118

break;

1070

1119

}

1085

1134

errno = old_errno;

1086

1135

}

1087

1136

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){

1137

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

1138

int ret;

1139

1140

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

1141

if(s < 0){

1142

perror_plus("socket");

1143

return false;

1144

}

1145

strcpy(ifr->ifr_name, ifname);

1146

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1147

if(ret == -1){

1144

1148

if(debug){

1145

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

1146

flagstring, if_entry->d_name);

1149

perror_plus("ioctl SIOCGIFFLAGS");

1147

1150

}

1148

free(flagstring);

1149

return 0;

1151

return false;

1150

1152

}

1151

free(flagstring);

1152

ifreq_flags flags = (ifreq_flags)tmpmax;

1153

return true;

1154

}

1155

1156

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

1157

1153

1158

/* Reject the loopback device */

1154

if(flags & IFF_LOOPBACK){

1159

if(ifr->ifr_flags & IFF_LOOPBACK){

1155

1160

if(debug){

1156

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

1157

if_entry->d_name);

1161

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

1162

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

1158

1163

}

1159

return 0;

1164

return false;

1160

1165

}

1161

1166

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

1162

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

1167

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

1163

1168

if(debug){

1164

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

1165

if_entry->d_name);

1169

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

1170

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

1166

1171

}

1167

return 1;

1172

return true;

1168

1173

}

1169

1174

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

1170

if(not (flags & IFF_BROADCAST)){

1175

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

1171

1176

if(debug){

1172

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

1173

if_entry->d_name);

1177

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

1178

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

1174

1179

}

1175

return 0;

1180

return false;

1176

1181

}

1177

1182

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

1178

if(flags & IFF_NOARP){

1183

if(ifr->ifr_flags & IFF_NOARP){

1179

1184

if(debug){

1180

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

1181

if_entry->d_name);

1185

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

1186

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

1182

1187

}

1183

return 0;

1188

return false;

1184

1189

}

1190

1185

1191

/* Accept this device */

1186

1192

if(debug){

1187

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

1188

if_entry->d_name);

1193

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

1194

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

1195

}

1196

return true;

1197

}

1198

1199

/*

1200

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

1201

* corresponds to an acceptable network device.

1202

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

1203

*/

1204

int good_interface(const struct dirent *if_entry){

1205

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

1206

return 0;

1207

}

1208

1209

struct ifreq ifr;

1210

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

1211

if(debug){

1212

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

1213

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

1214

if_entry->d_name);

1215

}

1216

return 0;

1217

}

1218

1219

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

1220

return 0;

1221

}

1222

return 1;

1223

}

1224

1225

/*

1226

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

1227

* corresponds to an acceptable network device which is up.

1228

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

1229

*/

1230

int up_interface(const struct dirent *if_entry){

1231

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

1232

return 0;

1233

}

1234

1235

struct ifreq ifr;

1236

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

1237

if(debug){

1238

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

1239

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

1240

if_entry->d_name);

1241

}

1242

return 0;

1243

}

1244

1245

/* Reject down interfaces */

1246

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

1247

if(debug){

1248

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

1249

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

1250

if_entry->d_name);

1251

}

1252

return 0;

1253

}

1254

1255

/* Reject non-running interfaces */

1256

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

1257

if(debug){

1258

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

1259

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

1260

if_entry->d_name);

1261

}

1262

return 0;

1263

}

1264

1265

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

1266

return 0;

1189

1267

}

1190

1268

return 1;

1191

1269

}

1201

1279

return 1;

1202

1280

}

1203

1281

1282

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

1283

int runnable_hook(const struct dirent *direntry){

1284

int ret;

1285

struct stat st;

1286

1287

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

1288

/* Empty name? */

1289

return 0;

1290

}

1291

1292

/* Save pointer to last character */

1293

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

1294

1295

if(*end == '~'){

1296

/* Backup name~ */

1297

return 0;

1298

}

1299

1300

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

1301

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

1302

/* Temporary #name# */

1303

return 0;

1304

}

1305

1306

/* XXX more rules here */

1307

1308

char *fullname = NULL;

1309

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

1310

direntry->d_name);

1311

if(ret < 0){

1312

perror_plus("asprintf");

1313

return 0;

1314

}

1315

1316

ret = stat(fullname, &st);

1317

if(ret == -1){

1318

if(debug){

1319

perror_plus("Could not stat plugin");

1320

}

1321

return 0;

1322

}

1323

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

1324

/* Not a regular file */

1325

return 0;

1326

}

1327

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

1328

/* Not executable */

1329

return 0;

1330

}

1331

return 1;

1332

}

1333

1204

1334

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1205

1335

int ret;

1206

1336

struct timespec now;

1210

1340

while(true){

1211

1341

if(mc.current_server == NULL){

1212

1342

if (debug){

1213

fprintf(stderr,

1343

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

1214

1344

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

1215

1345

}

1216

1346

ret = avahi_simple_poll_iterate(s, -1);

1217

1347

} else {

1218

1348

if (debug){

1219

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

1349

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

1350

"Check current_server if we should run it,"

1220

1351

" or wait\n");

1221

1352

}

1222

1353

/* the current time */

1239

1370

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

1240

1371

1241

1372

if (debug){

1242

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

1373

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

1374

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

1243

1375

}

1244

1376

1245

1377

if(block_time <= 0){

1265

1397

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

1266

1398

}

1267

1399

if(ret != 0){

1268

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

1400

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

1269

1401

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

1270

1402

}

1271

1403

}

1359

1491

.arg = "SECONDS",

1360

1492

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

1361

1493

.group = 2 },

1494

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

1495

.arg = "DIR",

1496

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

1497

.group = 2 },

1362

1498

/*

1363

1499

* These reproduce what we would get without ARGP_NO_HELP

1364

1500

*/

1417

1553

argp_error(state, "Bad retry interval");

1418

1554

}

1419

1555

break;

1556

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

1557

hookdir = arg;

1558

break;

1420

1559

/*

1421

1560

* These reproduce what we would get without ARGP_NO_HELP

1422

1561

*/

1428

1567

argp_state_help(state, state->out_stream,

1429

1568

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1430

1569

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

1570

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

1431

1571

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

1432

1572

exit(argp_err_exit_status);

1433

1573

break;

1518

1658

}

1519

1659

}

1520

1660

1661

/* Find network hooks and run them */

1662

{

1663

struct dirent **direntries;

1664

struct dirent *direntry;

1665

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

1666

alphasort);

1667

if(numhooks == -1){

1668

perror_plus("scandir");

1669

} else {

1670

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

1671

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

1672

direntry = direntries[0];

1673

char *fullname = NULL;

1674

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

1675

if(ret < 0){

1676

perror_plus("asprintf");

1677

continue;

1678

}

1679

pid_t hook_pid = fork();

1680

if(hook_pid == 0){

1681

/* Child */

1682

dup2(devnull, STDIN_FILENO);

1683

close(devnull);

1684

dup2(STDERR_FILENO, STDOUT_FILENO);

1685

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

1686

if(ret == -1){

1687

perror_plus("setenv");

1688

exit(1);

1689

}

1690

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

1691

if(ret == -1){

1692

perror_plus("setenv");

1693

exit(1);

1694

}

1695

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

1696

if(ret == -1){

1697

perror_plus("setenv");

1698

exit(1);

1699

}

1700

char *delaystring;

1701

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

1702

if(ret == -1){

1703

perror_plus("asprintf");

1704

exit(1);

1705

}

1706

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

1707

if(ret == -1){

1708

free(delaystring);

1709

perror_plus("setenv");

1710

exit(1);

1711

}

1712

free(delaystring);

1713

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

1714

perror_plus("execl");

1715

} else {

1716

int status;

1717

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

1718

perror_plus("waitpid");

1719

free(fullname);

1720

continue;

1721

}

1722

if(WIFEXITED(status)){

1723

if(WEXITSTATUS(status) != 0){

1724

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

1725

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

1726

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

1727

WEXITSTATUS(status));

1728

free(fullname);

1729

continue;

1730

}

1731

} else if(WIFSIGNALED(status)){

1732

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

1733

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

1734

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

1735

WTERMSIG(status));

1736

free(fullname);

1737

continue;

1738

} else {

1739

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

1740

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

1741

direntry->d_name);

1742

free(fullname);

1743

continue;

1744

}

1745

}

1746

free(fullname);

1747

if(quit_now){

1748

goto end;

1749

}

1750

}

1751

close(devnull);

1752

}

1753

}

1754

1521

1755

if(not debug){

1522

1756

avahi_set_log_function(empty_log);

1523

1757

}

1524

1758

1525

1759

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

1526

1760

struct dirent **direntries;

1527

ret = scandir(sys_class_net, &direntries, good_interface,

1761

/* First look for interfaces that are up */

1762

ret = scandir(sys_class_net, &direntries, up_interface,

1528

1763

alphasort);

1764

if(ret == 0){

1765

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

1766

free(direntries);

1767

ret = scandir(sys_class_net, &direntries, good_interface,

1768

alphasort);

1769

}

1529

1770

if(ret >= 1){

1530

/* Pick the first good interface */

1771

/* Pick the first interface returned */

1531

1772

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

1532

1773

if(debug){

1533

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

1774

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

1775

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

1534

1776

}

1535

1777

if(interface == NULL){

1536

1778

perror_plus("malloc");

1541

1783

free(direntries);

1542

1784

} else {

1543

1785

free(direntries);

1544

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

1786

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

1787

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

1545

1788

exitcode = EXIT_FAILURE;

1546

1789

goto end;

1547

1790

}

1553

1796

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

1554

1797

mc.simple_poll = avahi_simple_poll_new();

1555

1798

if(mc.simple_poll == NULL){

1556

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

1799

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

1800

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

1557

1801

exitcode = EX_UNAVAILABLE;

1558

1802

goto end;

1559

1803

}

1625

1869

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

1626

1870

if_index = (AvahiIfIndex) if_nametoindex(interface);

1627

1871

if(if_index == 0){

1628

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

1872

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

1873

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

1629

1874

exitcode = EX_UNAVAILABLE;

1630

1875

goto end;

1631

1876

}

1772

2017

1773

2018

ret = init_gnutls_global(pubkey, seckey);

1774

2019

if(ret == -1){

1775

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

2020

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

2021

"init_gnutls_global failed\n");

1776

2022

exitcode = EX_UNAVAILABLE;

1777

2023

goto end;

1778

2024

} else {

1794

2040

}

1795

2041

1796

2042

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

1797

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

2043

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

2044

"init_gpgme failed\n");

1798

2045

exitcode = EX_UNAVAILABLE;

1799

2046

goto end;

1800

2047

} else {

1810

2057

/* (Mainly meant for debugging) */

1811

2058

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

1812

2059

if(address == NULL){

1813

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

2060

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

2061

"No colon in address\n");

1814

2062

exitcode = EX_USAGE;

1815

2063

goto end;

1816

2064

}

1824

2072

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

1825

2073

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

1826

2074

or tmpmax != (uint16_t)tmpmax){

1827

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

2075

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

2076

"Bad port number\n");

1828

2077

exitcode = EX_USAGE;

1829

2078

goto end;

1830

2079

}

1860

2109

break;

1861

2110

}

1862

2111

if(debug){

1863

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

1864

(int)retry_interval);

2112

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

2113

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

1865

2114

}

1866

2115

sleep((int)retry_interval);

1867

2116

}

1869

2118

if (not quit_now){

1870

2119

exitcode = EXIT_SUCCESS;

1871

2120

}

1872

2121

1873

2122

goto end;

1874

2123

}

1875

2124

1897

2146

1898

2147

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

1899

2148

if(mc.server == NULL){

1900

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

2149

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

2150

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

1901

2151

avahi_strerror(error));

1902

2152

exitcode = EX_UNAVAILABLE;

1903

2153

goto end;

1912

2162

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1913

2163

NULL, 0, browse_callback, NULL);

1914

2164

if(sb == NULL){

1915

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

2165

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

2166

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

1916

2167

avahi_strerror(avahi_server_errno(mc.server)));

1917

2168

exitcode = EX_UNAVAILABLE;

1918

2169

goto end;

1925

2176

/* Run the main loop */

1926

2177

1927

2178

if(debug){

1928

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

2179

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

2180

"Starting Avahi loop search\n");

1929

2181

}

1930

2182

1931

2183

ret = avahi_loop_with_timeout(mc.simple_poll,

1932

2184

(int)(retry_interval * 1000));

1933

2185

if(debug){

1934

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

2186

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

2187

"avahi_loop_with_timeout exited %s\n",

1935

2188

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

1936

2189

}

1937

2190

1938

2191

end:

1939

2192

1940

2193

if(debug){

1941

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

2194

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

2195

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

1942

2196

}

1943

2197

1944

2198

/* Cleanup things */

1972

2226

}

1973

2227

}

1974

2228

2229

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

2230

1975

2231

/* Take down the network interface */

1976

2232

if(take_down_interface){

1977

2233

/* Re-raise priviliges */

1984

2240

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

1985

2241

if(ret == -1){

1986

2242

perror_plus("ioctl SIOCGIFFLAGS");

1987

} else if(network.ifr_flags & IFF_UP) {

2243

} else if(network.ifr_flags & IFF_UP){

1988

2244

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

1989

2245

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

1990

2246

if(ret == -1){

2022

2278

}

2023

2279

ret = remove(fullname);

2024

2280

if(ret == -1){

2025

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

2026

strerror(errno));

2281

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

2282

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

2027

2283

}

2028

2284

free(fullname);

2029

2285

}