/mandos/trunk : revision 505.1.2

53

sockaddr_in6, PF_INET6,

54

SOCK_STREAM, uid_t, gid_t, open(),

55

opendir(), DIR */

56

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

56

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

57

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

58

inet_pton(), connect() */

59

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

85

raise() */

86

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

87

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

88

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

89

WEXITSTATUS(), WTERMSIG() */

90

88

91

89

#ifdef __linux__

92

90

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

125

123

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

126

124

#define SECKEY "seckey.txt"

127

125

#define PUBKEY "pubkey.txt"

128

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

129

126

130

127

bool debug = false;

131

128

static const char mandos_protocol_version[] = "1";

133

130

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

134

131

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

135

132

char *connect_to = NULL;

136

const char *hookdir = HOOKDIR;

137

133

138

134

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

139

135

typedef struct server{

254

250

255

251

rc = gpgme_data_new_from_fd(&pgp_data, fd);

256

252

if(rc != GPG_ERR_NO_ERROR){

257

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

258

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

253

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

259

254

gpgme_strsource(rc), gpgme_strerror(rc));

260

255

return false;

261

256

}

262

257

263

258

rc = gpgme_op_import(mc.ctx, pgp_data);

264

259

if(rc != GPG_ERR_NO_ERROR){

265

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

266

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

260

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

267

261

gpgme_strsource(rc), gpgme_strerror(rc));

268

262

return false;

269

263

}

277

271

}

278

272

279

273

if(debug){

280

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

281

"Initializing GPGME\n");

274

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

282

275

}

283

276

284

277

/* Init GPGME */

285

278

gpgme_check_version(NULL);

286

279

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

287

280

if(rc != GPG_ERR_NO_ERROR){

288

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

289

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

281

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

290

282

gpgme_strsource(rc), gpgme_strerror(rc));

291

283

return false;

292

284

}

294

286

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

295

287

rc = gpgme_get_engine_info(&engine_info);

296

288

if(rc != GPG_ERR_NO_ERROR){

297

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

298

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

289

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

299

290

gpgme_strsource(rc), gpgme_strerror(rc));

300

291

return false;

301

292

}

308

299

engine_info = engine_info->next;

309

300

}

310

301

if(engine_info == NULL){

311

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

312

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

302

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

313

303

return false;

314

304

}

315

305

316

306

/* Create new GPGME "context" */

317

307

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

318

308

if(rc != GPG_ERR_NO_ERROR){

319

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

320

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

321

gpgme_strerror(rc));

309

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

310

gpgme_strsource(rc), gpgme_strerror(rc));

322

311

return false;

323

312

}

324

313

343

332

ssize_t plaintext_length = 0;

344

333

345

334

if(debug){

346

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

347

"Trying to decrypt OpenPGP data\n");

335

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

348

336

}

349

337

350

338

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

351

339

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

352

340

0);

353

341

if(rc != GPG_ERR_NO_ERROR){

354

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

355

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

342

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

356

343

gpgme_strsource(rc), gpgme_strerror(rc));

357

344

return -1;

358

345

}

360

347

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

361

348

rc = gpgme_data_new(&dh_plain);

362

349

if(rc != GPG_ERR_NO_ERROR){

363

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

364

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

350

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

365

351

gpgme_strsource(rc), gpgme_strerror(rc));

366

352

gpgme_data_release(dh_crypto);

367

353

return -1;

371

357

data buffer */

372

358

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

373

359

if(rc != GPG_ERR_NO_ERROR){

374

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

375

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

360

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

376

361

gpgme_strsource(rc), gpgme_strerror(rc));

377

362

plaintext_length = -1;

378

363

if(debug){

379

364

gpgme_decrypt_result_t result;

380

365

result = gpgme_op_decrypt_result(mc.ctx);

381

366

if(result == NULL){

382

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

383

"gpgme_op_decrypt_result failed\n");

367

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

384

368

} else {

385

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

386

"Unsupported algorithm: %s\n",

369

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

387

370

result->unsupported_algorithm);

388

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

389

"Wrong key usage: %u\n",

371

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

390

372

result->wrong_key_usage);

391

373

if(result->file_name != NULL){

392

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

393

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

374

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

394

375

}

395

376

gpgme_recipient_t recipient;

396

377

recipient = result->recipients;

397

378

while(recipient != NULL){

398

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

399

"Public key algorithm: %s\n",

379

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

400

380

gpgme_pubkey_algo_name(recipient->pubkey_algo));

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",

381

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

382

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

405

383

recipient->status == GPG_ERR_NO_SECKEY

406

384

? "No" : "Yes");

407

385

recipient = recipient->next;

412

390

}

413

391

414

392

if(debug){

415

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

416

"Decryption of OpenPGP data succeeded\n");

393

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

417

394

}

418

395

419

396

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

450

427

}

451

428

452

429

if(debug){

453

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

454

"Decrypted password is: ");

430

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

455

431

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

456

432

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

457

433

}

479

455

/* GnuTLS log function callback */

480

456

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

481

457

const char* string){

482

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

458

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

483

459

}

484

460

485

461

static int init_gnutls_global(const char *pubkeyfilename,

487

463

int ret;

488

464

489

465

if(debug){

490

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

491

"Initializing GnuTLS\n");

466

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

492

467

}

493

468

494

469

ret = gnutls_global_init();

495

470

if(ret != GNUTLS_E_SUCCESS){

496

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

497

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

471

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

472

safer_gnutls_strerror(ret));

498

473

return -1;

499

474

}

500

475

509

484

/* OpenPGP credentials */

510

485

ret = gnutls_certificate_allocate_credentials(&mc.cred);

511

486

if(ret != GNUTLS_E_SUCCESS){

512

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

513

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

487

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

488

safer_gnutls_strerror(ret));

514

489

gnutls_global_deinit();

515

490

return -1;

516

491

}

517

492

518

493

if(debug){

519

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

520

"Attempting to use OpenPGP public key %s and"

494

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

521

495

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

522

496

seckeyfilename);

523

497

}

527

501

GNUTLS_OPENPGP_FMT_BASE64);

528

502

if(ret != GNUTLS_E_SUCCESS){

529

503

fprintf(stderr,

530

"Mandos plugin mandos-client: "

531

504

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

532

505

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

533

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

534

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

506

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

507

safer_gnutls_strerror(ret));

535

508

goto globalfail;

536

509

}

537

510

538

511

/* GnuTLS server initialization */

539

512

ret = gnutls_dh_params_init(&mc.dh_params);

540

513

if(ret != GNUTLS_E_SUCCESS){

541

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

542

"Error in GnuTLS DH parameter initialization:"

514

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

543

515

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

544

516

goto globalfail;

545

517

}

546

518

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

547

519

if(ret != GNUTLS_E_SUCCESS){

548

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

549

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

520

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

550

521

safer_gnutls_strerror(ret));

551

522

goto globalfail;

552

523

}

573

544

}

574

545

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

575

546

if(ret != GNUTLS_E_SUCCESS){

576

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

577

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

547

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

578

548

safer_gnutls_strerror(ret));

579

549

}

580

550

588

558

}

589

559

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

590

560

if(ret != GNUTLS_E_SUCCESS){

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));

561

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

562

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

563

safer_gnutls_strerror(ret));

595

564

gnutls_deinit(*session);

596

565

return -1;

597

566

}

606

575

}

607

576

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

608

577

if(ret != GNUTLS_E_SUCCESS){

609

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

610

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

578

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

611

579

safer_gnutls_strerror(ret));

612

580

gnutls_deinit(*session);

613

581

return -1;

659

627

pf = PF_INET;

660

628

break;

661

629

default:

662

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

663

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

630

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

664

631

errno = EINVAL;

665

632

return -1;

666

633

}

671

638

}

672

639

673

640

if(debug){

674

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

675

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

641

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

676

642

"\n", ip, port);

677

643

}

678

644

705

671

}

706

672

if(ret == 0){

707

673

int e = errno;

708

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

709

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

674

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

710

675

errno = e;

711

676

goto mandos_end;

712

677

}

719

684

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

720

685

-Wunreachable-code*/

721

686

if(if_index == AVAHI_IF_UNSPEC){

722

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

723

"An IPv6 link-local address is incomplete"

687

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

724

688

" without a network interface\n");

725

689

errno = EINVAL;

726

690

goto mandos_end;

745

709

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

746

710

perror_plus("if_indextoname");

747

711

} else {

748

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

749

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

712

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

750

713

ip, interface, port);

751

714

}

752

715

} else {

753

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

754

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

716

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

717

port);

755

718

}

756

719

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

757

720

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

767

730

perror_plus("inet_ntop");

768

731

} else {

769

732

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

770

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

771

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

733

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

772

734

}

773

735

}

774

736

}

828

790

}

829

791

830

792

if(debug){

831

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

832

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

793

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

833

794

}

834

795

835

796

if(quit_now){

855

816

856

817

if(ret != GNUTLS_E_SUCCESS){

857

818

if(debug){

858

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

859

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

819

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

860

820

gnutls_perror(ret);

861

821

}

862

822

errno = EPROTO;

866

826

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

867

827

868

828

if(debug){

869

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

870

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

829

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

830

ip);

871

831

}

872

832

873

833

while(true){

911

871

}

912

872

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

913

873

if(ret < 0){

914

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

915

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

874

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

916

875

gnutls_perror(ret);

917

876

errno = EPROTO;

918

877

goto mandos_end;

919

878

}

920

879

break;

921

880

default:

922

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

923

"Unknown error while reading data from"

881

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

924

882

" encrypted session with Mandos server\n");

925

883

gnutls_bye(session, GNUTLS_SHUT_RDWR);

926

884

errno = EIO;

932

890

}

933

891

934

892

if(debug){

935

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

936

"Closing TLS session\n");

893

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

937

894

}

938

895

939

896

if(quit_now){

969

926

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

970

927

int e = errno;

971

928

if(debug){

972

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

973

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

929

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

974

930

strerror(errno));

975

931

}

976

932

errno = e;

1034

990

switch(event){

1035

991

default:

1036

992

case AVAHI_RESOLVER_FAILURE:

1037

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

1038

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

993

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

1039

994

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

1040

995

avahi_strerror(avahi_server_errno(mc.server)));

1041

996

break;

1045

1000

char ip[AVAHI_ADDRESS_STR_MAX];

1046

1001

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

1047

1002

if(debug){

1048

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

1049

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

1003

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

1050

1004

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

1051

1005

ip, (intmax_t)interface, port);

1052

1006

}

1086

1040

default:

1087

1041

case AVAHI_BROWSER_FAILURE:

1088

1042

1089

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

1090

"(Avahi browser) %s\n",

1043

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

1091

1044

avahi_strerror(avahi_server_errno(mc.server)));

1092

1045

avahi_simple_poll_quit(mc.simple_poll);

1093

1046

return;

1101

1054

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

1102

1055

name, type, domain, protocol, 0,

1103

1056

resolve_callback, NULL) == NULL)

1104

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

1105

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

1057

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

1106

1058

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

1107

1059

break;

1108

1060

1112

1064

case AVAHI_BROWSER_ALL_FOR_NOW:

1113

1065

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1114

1066

if(debug){

1115

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

1116

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

1067

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

1117

1068

}

1118

1069

break;

1119

1070

}

1134

1085

errno = old_errno;

1135

1086

}

1136

1087

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){

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){

1148

1144

if(debug){

1149

perror_plus("ioctl SIOCGIFFLAGS");

1145

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

1146

flagstring, if_entry->d_name);

1150

1147

}

1151

return false;

1148

free(flagstring);

1149

return 0;

1152

1150

}

1153

return true;

1154

}

1155

1156

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

1157

1151

free(flagstring);

1152

ifreq_flags flags = (ifreq_flags)tmpmax;

1158

1153

/* Reject the loopback device */

1159

if(ifr->ifr_flags & IFF_LOOPBACK){

1154

if(flags & IFF_LOOPBACK){

1160

1155

if(debug){

1161

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

1162

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

1156

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

1157

if_entry->d_name);

1163

1158

}

1164

return false;

1159

return 0;

1165

1160

}

1166

1161

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

1167

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

1162

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

1168

1163

if(debug){

1169

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

1170

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

1164

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

1165

if_entry->d_name);

1171

1166

}

1172

return true;

1167

return 1;

1173

1168

}

1174

1169

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

1175

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

1170

if(not (flags & IFF_BROADCAST)){

1176

1171

if(debug){

1177

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

1178

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

1172

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

1173

if_entry->d_name);

1179

1174

}

1180

return false;

1175

return 0;

1181

1176

}

1182

1177

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

1183

if(ifr->ifr_flags & IFF_NOARP){

1178

if(flags & IFF_NOARP){

1184

1179

if(debug){

1185

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

1186

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

1180

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

1181

if_entry->d_name);

1187

1182

}

1188

return false;

1183

return 0;

1189

1184

}

1190

1191

1185

/* Accept this device */

1192

1186

if(debug){

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;

1187

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

1188

if_entry->d_name);

1267

1189

}

1268

1190

return 1;

1269

1191

}

1279

1201

return 1;

1280

1202

}

1281

1203

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

1334

1204

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1335

1205

int ret;

1336

1206

struct timespec now;

1340

1210

while(true){

1341

1211

if(mc.current_server == NULL){

1342

1212

if (debug){

1343

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

1213

fprintf(stderr,

1344

1214

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

1345

1215

}

1346

1216

ret = avahi_simple_poll_iterate(s, -1);

1347

1217

} else {

1348

1218

if (debug){

1349

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

1350

"Check current_server if we should run it,"

1219

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

1351

1220

" or wait\n");

1352

1221

}

1353

1222

/* the current time */

1370

1239

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

1371

1240

1372

1241

if (debug){

1373

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

1374

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

1242

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

1375

1243

}

1376

1244

1377

1245

if(block_time <= 0){

1397

1265

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

1398

1266

}

1399

1267

if(ret != 0){

1400

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

1268

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

1401

1269

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

1402

1270

}

1403

1271

}

1491

1359

.arg = "SECONDS",

1492

1360

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

1493

1361

.group = 2 },

1494

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

1495

.arg = "DIR",

1496

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

1497

.group = 2 },

1498

1362

/*

1499

1363

* These reproduce what we would get without ARGP_NO_HELP

1500

1364

*/

1553

1417

argp_error(state, "Bad retry interval");

1554

1418

}

1555

1419

break;

1556

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

1557

hookdir = arg;

1558

break;

1559

1420

/*

1560

1421

* These reproduce what we would get without ARGP_NO_HELP

1561

1422

*/

1567

1428

argp_state_help(state, state->out_stream,

1568

1429

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1569

1430

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

1570

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

1571

1431

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

1572

1432

exit(argp_err_exit_status);

1573

1433

break;

1658

1518

}

1659

1519

}

1660

1520

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

1755

1521

if(not debug){

1756

1522

avahi_set_log_function(empty_log);

1757

1523

}

1758

1524

1759

1525

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

1760

1526

struct dirent **direntries;

1761

/* First look for interfaces that are up */

1762

ret = scandir(sys_class_net, &direntries, up_interface,

1527

ret = scandir(sys_class_net, &direntries, good_interface,

1763

1528

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

}

1770

1529

if(ret >= 1){

1771

/* Pick the first interface returned */

1530

/* Pick the first good interface */

1772

1531

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

1773

1532

if(debug){

1774

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

1775

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

1533

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

1776

1534

}

1777

1535

if(interface == NULL){

1778

1536

perror_plus("malloc");

1783

1541

free(direntries);

1784

1542

} else {

1785

1543

free(direntries);

1786

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

1787

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

1544

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

1788

1545

exitcode = EXIT_FAILURE;

1789

1546

goto end;

1790

1547

}

1796

1553

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

1797

1554

mc.simple_poll = avahi_simple_poll_new();

1798

1555

if(mc.simple_poll == NULL){

1799

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

1800

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

1556

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

1801

1557

exitcode = EX_UNAVAILABLE;

1802

1558

goto end;

1803

1559

}

1869

1625

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

1870

1626

if_index = (AvahiIfIndex) if_nametoindex(interface);

1871

1627

if(if_index == 0){

1872

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

1873

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

1628

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

1874

1629

exitcode = EX_UNAVAILABLE;

1875

1630

goto end;

1876

1631

}

2017

1772

2018

1773

ret = init_gnutls_global(pubkey, seckey);

2019

1774

if(ret == -1){

2020

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

2021

"init_gnutls_global failed\n");

1775

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

2022

1776

exitcode = EX_UNAVAILABLE;

2023

1777

goto end;

2024

1778

} else {

2040

1794

}

2041

1795

2042

1796

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

2043

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

2044

"init_gpgme failed\n");

1797

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

2045

1798

exitcode = EX_UNAVAILABLE;

2046

1799

goto end;

2047

1800

} else {

2057

1810

/* (Mainly meant for debugging) */

2058

1811

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

2059

1812

if(address == NULL){

2060

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

2061

"No colon in address\n");

1813

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

2062

1814

exitcode = EX_USAGE;

2063

1815

goto end;

2064

1816

}

2072

1824

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

2073

1825

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

2074

1826

or tmpmax != (uint16_t)tmpmax){

2075

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

2076

"Bad port number\n");

1827

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

2077

1828

exitcode = EX_USAGE;

2078

1829

goto end;

2079

1830

}

2109

1860

break;

2110

1861

}

2111

1862

if(debug){

2112

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

2113

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

1863

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

1864

(int)retry_interval);

2114

1865

}

2115

1866

sleep((int)retry_interval);

2116

1867

}

2118

1869

if (not quit_now){

2119

1870

exitcode = EXIT_SUCCESS;

2120

1871

}

2121

1872

2122

1873

goto end;

2123

1874

}

2124

1875

2146

1897

2147

1898

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

2148

1899

if(mc.server == NULL){

2149

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

2150

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

1900

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

2151

1901

avahi_strerror(error));

2152

1902

exitcode = EX_UNAVAILABLE;

2153

1903

goto end;

2162

1912

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2163

1913

NULL, 0, browse_callback, NULL);

2164

1914

if(sb == NULL){

2165

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

2166

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

1915

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

2167

1916

avahi_strerror(avahi_server_errno(mc.server)));

2168

1917

exitcode = EX_UNAVAILABLE;

2169

1918

goto end;

2176

1925

/* Run the main loop */

2177

1926

2178

1927

if(debug){

2179

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

2180

"Starting Avahi loop search\n");

1928

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

2181

1929

}

2182

1930

2183

1931

ret = avahi_loop_with_timeout(mc.simple_poll,

2184

1932

(int)(retry_interval * 1000));

2185

1933

if(debug){

2186

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

2187

"avahi_loop_with_timeout exited %s\n",

1934

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

2188

1935

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

2189

1936

}

2190

1937

2191

1938

end:

2192

1939

2193

1940

if(debug){

2194

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

2195

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

1941

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

2196

1942

}

2197

1943

2198

1944

/* Cleanup things */

2226

1972

}

2227

1973

}

2228

1974

2229

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

2230

2231

1975

/* Take down the network interface */

2232

1976

if(take_down_interface){

2233

1977

/* Re-raise priviliges */

2240

1984

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

2241

1985

if(ret == -1){

2242

1986

perror_plus("ioctl SIOCGIFFLAGS");

2243

} else if(network.ifr_flags & IFF_UP){

1987

} else if(network.ifr_flags & IFF_UP) {

2244

1988

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

2245

1989

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

2246

1990

if(ret == -1){

2278

2022

}

2279

2023

ret = remove(fullname);

2280

2024

if(ret == -1){

2281

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

2282

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

2025

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

2026

strerror(errno));

2283

2027

}

2284

2028

free(fullname);

2285

2029

}