/mandos/release : revision 237.7.243

234

.af = af };

235

if(new_server->ip == NULL){

236

perror_plus("strdup");

237

free(new_server);

238

237

return false;

239

238

}

240

239

ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));

241

240

if(ret == -1){

242

241

perror_plus("clock_gettime");

243

#ifdef __GNUC__

244

#pragma GCC diagnostic push

245

#pragma GCC diagnostic ignored "-Wcast-qual"

246

#endif

247

free((char *)(new_server->ip));

248

#ifdef __GNUC__

249

#pragma GCC diagnostic pop

250

#endif

251

free(new_server);

252

242

return false;

253

243

}

254

244

/* Special case of first server */

493

483

return plaintext_length;

494

484

}

495

485

496

__attribute__((warn_unused_result, const))

497

static const char *safe_string(const char *str){

498

if(str == NULL)

499

return "(unknown)";

500

return str;

501

}

502

503

486

__attribute__((warn_unused_result))

504

487

static const char *safer_gnutls_strerror(int value){

505

488

const char *ret = gnutls_strerror(value);

506

return safe_string(ret);

489

if(ret == NULL)

490

ret = "(unknown)";

491

return ret;

507

492

}

508

493

509

494

/* GnuTLS log function callback */

518

503

const char *seckeyfilename,

519

504

mandos_context *mc){

520

505

int ret;

521

unsigned int uret;

522

506

523

507

if(debug){

524

508

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

575

559

safer_gnutls_strerror(ret));

576

560

goto globalfail;

577

561

}

578

if(mc->dh_bits == 0){

579

/* Find out the optimal number of DH bits */

580

/* Try to read the private key file */

581

gnutls_datum_t buffer = { .data = NULL, .size = 0 };

582

{

583

int secfile = open(seckeyfilename, O_RDONLY);

584

size_t buffer_capacity = 0;

585

while(true){

586

buffer_capacity = incbuffer((char **)&buffer.data,

587

(size_t)buffer.size,

588

(size_t)buffer_capacity);

589

if(buffer_capacity == 0){

590

perror_plus("incbuffer");

591

free(buffer.data);

592

buffer.data = NULL;

593

break;

594

}

595

ssize_t bytes_read = read(secfile, buffer.data + buffer.size,

596

BUFFER_SIZE);

597

/* EOF */

598

if(bytes_read == 0){

599

break;

600

}

601

/* check bytes_read for failure */

602

if(bytes_read < 0){

603

perror_plus("read");

604

free(buffer.data);

605

buffer.data = NULL;

606

break;

607

}

608

buffer.size += (unsigned int)bytes_read;

609

}

610

close(secfile);

611

}

612

/* If successful, use buffer to parse private key */

613

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

614

if(buffer.data != NULL){

615

{

616

gnutls_openpgp_privkey_t privkey = NULL;

617

ret = gnutls_openpgp_privkey_init(&privkey);

618

if(ret != GNUTLS_E_SUCCESS){

619

fprintf_plus(stderr, "Error initializing OpenPGP key"

620

" structure: %s", safer_gnutls_strerror(ret));

621

free(buffer.data);

622

buffer.data = NULL;

623

} else {

624

ret = gnutls_openpgp_privkey_import(privkey, &buffer,

625

GNUTLS_OPENPGP_FMT_BASE64,

626

"", 0);

627

if(ret != GNUTLS_E_SUCCESS){

628

fprintf_plus(stderr, "Error importing OpenPGP key : %s",

629

safer_gnutls_strerror(ret));

630

privkey = NULL;

631

}

632

free(buffer.data);

633

buffer.data = NULL;

634

if(privkey != NULL){

635

/* Use private key to suggest an appropriate sec_param */

636

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

637

gnutls_openpgp_privkey_deinit(privkey);

638

if(debug){

639

fprintf_plus(stderr, "This OpenPGP key implies using a"

640

" GnuTLS security parameter \"%s\".\n",

641

safe_string(gnutls_sec_param_get_name

642

(sec_param)));

643

}

644

}

645

}

646

}

647

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

648

/* Err on the side of caution */

649

sec_param = GNUTLS_SEC_PARAM_ULTRA;

650

if(debug){

651

fprintf_plus(stderr, "Falling back to security parameter"

652

" \"%s\"\n",

653

safe_string(gnutls_sec_param_get_name

654

(sec_param)));

655

}

656

}

657

}

658

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

659

if(uret != 0){

660

mc->dh_bits = uret;

661

if(debug){

662

fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"

663

" implies %u DH bits; using that.\n",

664

safe_string(gnutls_sec_param_get_name

665

(sec_param)),

666

mc->dh_bits);

667

}

668

} else {

669

fprintf_plus(stderr, "Failed to get implied number of DH"

670

" bits for security parameter \"%s\"): %s\n",

671

safe_string(gnutls_sec_param_get_name(sec_param)),

672

safer_gnutls_strerror(ret));

673

goto globalfail;

674

}

675

} else if(debug){

676

fprintf_plus(stderr, "DH bits explicitly set to %u\n",

677

mc->dh_bits);

678

}

679

562

ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);

680

563

if(ret != GNUTLS_E_SUCCESS){

681

fprintf_plus(stderr, "Error in GnuTLS prime generation (%u bits):"

682

" %s\n", mc->dh_bits, safer_gnutls_strerror(ret));

564

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

565

safer_gnutls_strerror(ret));

683

566

goto globalfail;

684

567

}

685

568

1183

1066

timed out */

1184

1067

1185

1068

if(quit_now){

1186

avahi_s_service_resolver_free(r);

1187

1069

return;

1188

1070

}

1189

1071

1576

1458

error_t ret_errno = 0;

1577

1459

if(seteuid(0) == -1){

1578

1460

ret_errno = errno;

1461

perror_plus("seteuid");

1579

1462

}

1580

1463

errno = old_errno;

1581

1464

return ret_errno;

1592

1475

}

1593

1476

if(setuid(0) == -1){

1594

1477

ret_errno = errno;

1478

perror_plus("seteuid");

1595

1479

}

1596

1480

errno = old_errno;

1597

1481

return ret_errno;

1604

1488

error_t ret_errno = 0;

1605

1489

if(seteuid(uid) == -1){

1606

1490

ret_errno = errno;

1491

perror_plus("seteuid");

1607

1492

}

1608

1493

errno = old_errno;

1609

1494

return ret_errno;

1616

1501

error_t ret_errno = 0;

1617

1502

if(setuid(uid) == -1){

1618

1503

ret_errno = errno;

1504

perror_plus("setuid");

1619

1505

}

1620

1506

errno = old_errno;

1621

1507

return ret_errno;

1622

1508

}

1623

1509

1510

#ifndef O_CLOEXEC

1511

/*

1512

* Based on the example in the GNU LibC manual chapter 13.13 "File

1513

* Descriptor Flags".

1514

| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |

1515

*/

1516

__attribute__((warn_unused_result))

1517

static int set_cloexec_flag(int fd){

1518

int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));

1519

/* If reading the flags failed, return error indication now. */

1520

if(ret < 0){

1521

return ret;

1522

}

1523

/* Store modified flag word in the descriptor. */

1524

return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,

1525

ret | FD_CLOEXEC));

1526

}

1527

#endif /* not O_CLOEXEC */

1528

1624

1529

__attribute__((nonnull))

1625

1530

void run_network_hooks(const char *mode, const char *interface,

1626

1531

const float delay){

1627

struct dirent **direntries = NULL;

1532

struct dirent **direntries;

1628

1533

if(hookdir_fd == -1){

1629

hookdir_fd = open(hookdir, O_RDONLY);

1534

hookdir_fd = open(hookdir, O_RDONLY |

1535

#ifdef O_CLOEXEC

1536

O_CLOEXEC

1537

#else /* not O_CLOEXEC */

1538

0

1539

#endif /* not O_CLOEXEC */

1540

);

1630

1541

if(hookdir_fd == -1){

1631

1542

if(errno == ENOENT){

1632

1543

if(debug){

1638

1549

}

1639

1550

return;

1640

1551

}

1552

#ifndef O_CLOEXEC

1553

if(set_cloexec_flag(hookdir_fd) < 0){

1554

perror_plus("set_cloexec_flag");

1555

if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){

1556

perror_plus("close");

1557

} else {

1558

hookdir_fd = -1;

1559

}

1560

return;

1561

}

1562

#endif /* not O_CLOEXEC */

1641

1563

}

1642

1564

#ifdef __GLIBC__

1643

1565

#if __GLIBC_PREREQ(2, 15)

1668

1590

if(hook_pid == 0){

1669

1591

/* Child */

1670

1592

/* Raise privileges */

1671

errno = raise_privileges_permanently();

1672

if(errno != 0){

1593

if(raise_privileges_permanently() != 0){

1673

1594

perror_plus("Failed to raise privileges");

1674

1595

_exit(EX_NOPERM);

1675

1596

}

1742

1663

_exit(EX_OSERR);

1743

1664

}

1744

1665

}

1745

int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);

1746

if(hook_fd == -1){

1747

perror_plus("openat");

1748

_exit(EXIT_FAILURE);

1749

}

1750

if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){

1751

perror_plus("close");

1752

_exit(EXIT_FAILURE);

1753

}

1754

if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },

1755

environ) == -1){

1666

if(fexecve(hookdir_fd, (char *const [])

1667

{ direntry->d_name, NULL }, environ) == -1){

1756

1668

perror_plus("fexecve");

1757

1669

_exit(EXIT_FAILURE);

1758

1670

}

1759

1671

} else {

1760

if(hook_pid == -1){

1761

perror_plus("fork");

1762

free(direntry);

1763

continue;

1764

}

1765

1672

int status;

1766

1673

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

1767

1674

perror_plus("waitpid");

1768

free(direntry);

1769

1675

continue;

1770

1676

}

1771

1677

if(WIFEXITED(status)){

1773

1679

fprintf_plus(stderr, "Warning: network hook \"%s\" exited"

1774

1680

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

1775

1681

WEXITSTATUS(status));

1776

free(direntry);

1777

1682

continue;

1778

1683

}

1779

1684

} else if(WIFSIGNALED(status)){

1780

1685

fprintf_plus(stderr, "Warning: network hook \"%s\" died by"

1781

1686

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

1782

1687

WTERMSIG(status));

1783

free(direntry);

1784

1688

continue;

1785

1689

} else {

1786

1690

fprintf_plus(stderr, "Warning: network hook \"%s\""

1787

1691

" crashed\n", direntry->d_name);

1788

free(direntry);

1789

1692

continue;

1790

1693

}

1791

1694

}

1793

1696

fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",

1794

1697

direntry->d_name);

1795

1698

}

1796

free(direntry);

1797

1699

}

1798

free(direntries);

1799

1700

if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){

1800

1701

perror_plus("close");

1801

1702

} else {

1858

1759

/* Raise privileges */

1859

1760

ret_errno = raise_privileges();

1860

1761

if(ret_errno != 0){

1861

errno = ret_errno;

1862

1762

perror_plus("Failed to raise privileges");

1863

1763

}

1864

1764

1968

1868

/* Raise privileges */

1969

1869

ret_errno = raise_privileges();

1970

1870

if(ret_errno != 0){

1971

errno = ret_errno;

1972

1871

perror_plus("Failed to raise privileges");

1973

1872

}

1974

1873

2007

1906

}

2008

1907

2009

1908

int main(int argc, char *argv[]){

2010

mandos_context mc = { .server = NULL, .dh_bits = 0,

1909

mandos_context mc = { .server = NULL, .dh_bits = 1024,

2011

1910

.priority = "SECURE256:!CTYPE-X.509:"

2012

"+CTYPE-OPENPGP:!RSA", .current_server = NULL,

1911

"+CTYPE-OPENPGP", .current_server = NULL,

2013

1912

.interfaces = NULL, .interfaces_size = 0 };

2014

1913

AvahiSServiceBrowser *sb = NULL;

2015

1914

error_t ret_errno;

2381

2280

2382

2281

/* If no interfaces were specified, make a list */

2383

2282

if(mc.interfaces == NULL){

2384

struct dirent **direntries = NULL;

2283

struct dirent **direntries;

2385

2284

/* Look for any good interfaces */

2386

2285

ret = scandir(sys_class_net, &direntries, good_interface,

2387

2286

alphasort);

2393

2292

if(ret_errno != 0){

2394

2293

errno = ret_errno;

2395

2294

perror_plus("argz_add");

2396

free(direntries[i]);

2397

2295

continue;

2398

2296

}

2399

2297

if(debug){

2400

2298

fprintf_plus(stderr, "Will use interface \"%s\"\n",

2401

2299

direntries[i]->d_name);

2402

2300

}

2403

free(direntries[i]);

2404

2301

}

2405

2302

free(direntries);

2406

2303

} else {

2407

if(ret == 0){

2408

free(direntries);

2409

}

2304

free(direntries);

2410

2305

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

2411

2306

exitcode = EXIT_FAILURE;

2412

2307

goto end;

2676

2571

mc.current_server->prev->next = NULL;

2677

2572

while(mc.current_server != NULL){

2678

2573

server *next = mc.current_server->next;

2679

#ifdef __GNUC__

2680

#pragma GCC diagnostic push

2681

#pragma GCC diagnostic ignored "-Wcast-qual"

2682

#endif

2683

free((char *)(mc.current_server->ip));

2684

#ifdef __GNUC__

2685

#pragma GCC diagnostic pop

2686

#endif

2687

2574

free(mc.current_server);

2688

2575

mc.current_server = next;

2689

2576

}

2693

2580

{

2694

2581

ret_errno = raise_privileges();

2695

2582

if(ret_errno != 0){

2696

errno = ret_errno;

2697

2583

perror_plus("Failed to raise privileges");

2698

2584

} else {

2699

2585

2722

2608

2723

2609

ret_errno = lower_privileges_permanently();

2724

2610

if(ret_errno != 0){

2725

errno = ret_errno;

2726

2611

perror_plus("Failed to lower privileges permanently");

2727

2612

}

2728

2613

}

2733

2618

/* Removes the GPGME temp directory and all files inside */

2734

2619

if(tempdir != NULL){

2735

2620

struct dirent **direntries = NULL;

2736

int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |

2737

O_NOFOLLOW));

2621

int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY));

2738

2622

if(tempdir_fd == -1){

2739

2623

perror_plus("open");

2740

2624

} else {

2750

2634

int numentries = scandir(tempdir, &direntries, notdotentries,

2751

2635

alphasort);

2752

2636

#endif /* not __GLIBC__ */

2753

if(numentries >= 0){

2637

if(numentries > 0){

2754

2638

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

2755

2639

ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);

2756

2640

if(ret == -1){

2758

2642

" \"%s\", 0): %s\n", tempdir,

2759

2643

direntries[i]->d_name, strerror(errno));

2760

2644

}

2761

free(direntries[i]);

2762

2645

}

2763

2646

2764

2647

/* need to clean even if 0 because man page doesn't specify */