/mandos/release : revision 237.7.309

9

* "browse_callback", and parts of "main".

10

*

11

* Everything else is

12

13

14

*

15

* This file is part of Mandos.

16

*

17

* Mandos is free software: you can redistribute it and/or modify it

18

* under the terms of the GNU General Public License as published by

19

* the Free Software Foundation, either version 3 of the License, or

20

* (at your option) any later version.

21

*

22

* Mandos is distributed in the hope that it will be useful, but

12

13

14

*

15

* This program is free software: you can redistribute it and/or

16

* modify it under the terms of the GNU General Public License as

17

* published by the Free Software Foundation, either version 3 of the

18

* License, or (at your option) any later version.

19

*

20

* This program is distributed in the hope that it will be useful, but

23

21

* WITHOUT ANY WARRANTY; without even the implied warranty of

24

22

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

25

23

* General Public License for more details.

26

24

*

27

25

* You should have received a copy of the GNU General Public License

28

* along with Mandos. If not, see <http://www.gnu.org/licenses/>.

26

* along with this program. If not, see

27

* <http://www.gnu.org/licenses/>.

29

28

*

30

29

* Contact the authors at <mandos@recompile.se>.

31

30

*/

47

46

#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),

48

47

strtof(), abort() */

49

48

#include <stdbool.h> /* bool, false, true */

50

#include <string.h> /* strcmp(), strlen(), strerror(),

51

asprintf(), strncpy(), strsignal()

52

*/

49

#include <string.h> /* memset(), strcmp(), strlen(),

50

strerror(), asprintf(), strcpy() */

53

51

#include <sys/ioctl.h> /* ioctl */

54

52

#include <sys/types.h> /* socket(), inet_pton(), sockaddr,

55

53

sockaddr_in6, PF_INET6,

59

57

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

60

58

inet_pton(), connect(),

61

59

getnameinfo() */

62

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

60

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

63

61

#include <dirent.h> /* opendir(), struct dirent, readdir()

64

62

*/

65

63

#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,

66

64

strtoimax() */

67

#include <errno.h> /* perror(), errno, EINTR, EINVAL,

68

EAI_SYSTEM, ENETUNREACH,

69

EHOSTUNREACH, ECONNREFUSED, EPROTO,

70

EIO, ENOENT, ENXIO, ENOMEM, EISDIR,

71

ENOTEMPTY,

65

#include <errno.h> /* perror(), errno,

72

66

program_invocation_short_name */

73

67

#include <time.h> /* nanosleep(), time(), sleep() */

74

68

#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,

311

305

return false;

312

306

}

313

307

314

ret = close(fd);

308

ret = (int)TEMP_FAILURE_RETRY(close(fd));

315

309

if(ret == -1){

316

310

perror_plus("close");

317

311

}

519

513

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

520

514

}

521

515

522

__attribute__((nonnull(1, 2, 4), warn_unused_result))

516

__attribute__((nonnull, warn_unused_result))

523

517

static int init_gnutls_global(const char *pubkeyfilename,

524

518

const char *seckeyfilename,

525

const char *dhparamsfilename,

526

519

mandos_context *mc){

527

520

int ret;

528

521

unsigned int uret;

531

524

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

532

525

}

533

526

527

ret = gnutls_global_init();

528

if(ret != GNUTLS_E_SUCCESS){

529

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

530

safer_gnutls_strerror(ret));

531

return -1;

532

}

533

534

if(debug){

535

/* "Use a log level over 10 to enable all debugging options."

536

* - GnuTLS manual

544

if(ret != GNUTLS_E_SUCCESS){

545

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

546

safer_gnutls_strerror(ret));

547

gnutls_global_deinit();

547

548

return -1;

548

549

}

549

550

574

575

safer_gnutls_strerror(ret));

575

576

goto globalfail;

576

577

}

577

/* If a Diffie-Hellman parameters file was given, try to use it */

578

if(dhparamsfilename != NULL){

579

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

580

do {

581

int dhpfile = open(dhparamsfilename, O_RDONLY);

582

if(dhpfile == -1){

583

perror_plus("open");

584

dhparamsfilename = NULL;

585

break;

586

}

587

size_t params_capacity = 0;

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;

588

585

while(true){

589

params_capacity = incbuffer((char **)&params.data,

590

(size_t)params.size,

591

(size_t)params_capacity);

592

if(params_capacity == 0){

586

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

587

(size_t)buffer.size,

588

(size_t)buffer_capacity);

589

if(buffer_capacity == 0){

593

590

perror_plus("incbuffer");

594

free(params.data);

595

params.data = NULL;

596

dhparamsfilename = NULL;

591

free(buffer.data);

592

buffer.data = NULL;

597

593

break;

598

594

}

599

ssize_t bytes_read = read(dhpfile,

600

params.data + params.size,

595

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

601

596

BUFFER_SIZE);

602

597

/* EOF */

603

598

if(bytes_read == 0){

606

601

/* check bytes_read for failure */

607

602

if(bytes_read < 0){

608

603

perror_plus("read");

609

free(params.data);

610

params.data = NULL;

611

dhparamsfilename = NULL;

612

break;

613

}

614

params.size += (unsigned int)bytes_read;

615

}

616

ret = close(dhpfile);

617

if(ret == -1){

618

perror_plus("close");

619

}

620

if(params.data == NULL){

621

dhparamsfilename = NULL;

622

}

623

if(dhparamsfilename == NULL){

624

break;

625

}

626

ret = gnutls_dh_params_import_pkcs3(mc->dh_params, &params,

627

GNUTLS_X509_FMT_PEM);

628

if(ret != GNUTLS_E_SUCCESS){

629

fprintf_plus(stderr, "Failed to parse DH parameters in file"

630

" \"%s\": %s\n", dhparamsfilename,

631

safer_gnutls_strerror(ret));

632

dhparamsfilename = NULL;

633

}

634

free(params.data);

635

} while(false);

636

}

637

if(dhparamsfilename == NULL){

638

if(mc->dh_bits == 0){

639

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

640

/* Try to read the private key file */

641

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

642

do {

643

int secfile = open(seckeyfilename, O_RDONLY);

644

if(secfile == -1){

645

perror_plus("open");

646

break;

647

}

648

size_t buffer_capacity = 0;

649

while(true){

650

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

651

(size_t)buffer.size,

652

(size_t)buffer_capacity);

653

if(buffer_capacity == 0){

654

perror_plus("incbuffer");

655

free(buffer.data);

656

buffer.data = NULL;

657

break;

658

}

659

ssize_t bytes_read = read(secfile,

660

buffer.data + buffer.size,

661

BUFFER_SIZE);

662

/* EOF */

663

if(bytes_read == 0){

664

break;

665

}

666

/* check bytes_read for failure */

667

if(bytes_read < 0){

668

perror_plus("read");

669

free(buffer.data);

670

buffer.data = NULL;

671

break;

672

}

673

buffer.size += (unsigned int)bytes_read;

674

}

675

close(secfile);

676

} while(false);

677

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

678

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

679

if(buffer.data != NULL){

680

{

681

gnutls_openpgp_privkey_t privkey = NULL;

682

ret = gnutls_openpgp_privkey_init(&privkey);

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);

683

627

if(ret != GNUTLS_E_SUCCESS){

684

fprintf_plus(stderr, "Error initializing OpenPGP key"

685

" structure: %s",

628

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

686

629

safer_gnutls_strerror(ret));

687

free(buffer.data);

688

buffer.data = NULL;

689

} else {

690

ret = gnutls_openpgp_privkey_import

691

(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);

692

if(ret != GNUTLS_E_SUCCESS){

693

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

694

safer_gnutls_strerror(ret));

695

privkey = NULL;

696

}

697

free(buffer.data);

698

buffer.data = NULL;

699

if(privkey != NULL){

700

/* Use private key to suggest an appropriate

701

sec_param */

702

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

703

gnutls_openpgp_privkey_deinit(privkey);

704

if(debug){

705

fprintf_plus(stderr, "This OpenPGP key implies using"

706

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

707

safe_string(gnutls_sec_param_get_name

708

(sec_param)));

709

}

710

}

630

privkey = NULL;

711

631

}

712

}

713

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

714

/* Err on the side of caution */

715

sec_param = GNUTLS_SEC_PARAM_ULTRA;

716

if(debug){

717

fprintf_plus(stderr, "Falling back to security parameter"

718

" \"%s\"\n",

719

safe_string(gnutls_sec_param_get_name

720

(sec_param)));

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

}

721

644

}

722

645

}

723

646

}

724

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

725

if(uret != 0){

726

mc->dh_bits = uret;

647

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

648

/* Err on the side of caution */

649

sec_param = GNUTLS_SEC_PARAM_ULTRA;

727

650

if(debug){

728

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

729

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

651

fprintf_plus(stderr, "Falling back to security parameter"

652

" \"%s\"\n",

730

653

safe_string(gnutls_sec_param_get_name

731

(sec_param)),

732

mc->dh_bits);

654

(sec_param)));

733

655

}

734

} else {

735

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

736

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

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",

737

664

safe_string(gnutls_sec_param_get_name

738

665

(sec_param)),

739

safer_gnutls_strerror(ret));

740

goto globalfail;

666

mc->dh_bits);

741

667

}

742

} else if(debug){

743

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

744

mc->dh_bits);

745

}

746

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

747

if(ret != GNUTLS_E_SUCCESS){

748

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

749

" bits): %s\n", mc->dh_bits,

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)),

750

672

safer_gnutls_strerror(ret));

751

673

goto globalfail;

752

674

}

753

}

675

} else if(debug){

676

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

677

mc->dh_bits);

678

}

679

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

680

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));

683

goto globalfail;

684

}

685

754

686

gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);

755

687

756

688

return 0;

758

690

globalfail:

759

691

760

692

gnutls_certificate_free_credentials(mc->cred);

693

gnutls_global_deinit();

761

694

gnutls_dh_params_deinit(mc->dh_params);

762

695

return -1;

763

696

}

815

748

/* ignore client certificate if any. */

816

749

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

817

750

751

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

752

818

753

return 0;

819

754

}

820

755

824

759

825

760

/* Set effective uid to 0, return errno */

826

761

__attribute__((warn_unused_result))

827

int raise_privileges(void){

828

int old_errno = errno;

829

int ret = 0;

762

error_t raise_privileges(void){

763

error_t old_errno = errno;

764

error_t ret_errno = 0;

830

765

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

831

ret = errno;

766

ret_errno = errno;

832

767

}

833

768

errno = old_errno;

834

return ret;

769

return ret_errno;

835

770

}

836

771

837

772

/* Set effective and real user ID to 0. Return errno. */

838

773

__attribute__((warn_unused_result))

839

int raise_privileges_permanently(void){

840

int old_errno = errno;

841

int ret = raise_privileges();

842

if(ret != 0){

774

error_t raise_privileges_permanently(void){

775

error_t old_errno = errno;

776

error_t ret_errno = raise_privileges();

777

if(ret_errno != 0){

843

778

errno = old_errno;

844

return ret;

779

return ret_errno;

845

780

}

846

781

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

847

ret = errno;

782

ret_errno = errno;

848

783

}

849

784

errno = old_errno;

850

return ret;

785

return ret_errno;

851

786

}

852

787

853

788

/* Set effective user ID to unprivileged saved user ID */

854

789

__attribute__((warn_unused_result))

855

int lower_privileges(void){

856

int old_errno = errno;

857

int ret = 0;

790

error_t lower_privileges(void){

791

error_t old_errno = errno;

792

error_t ret_errno = 0;

858

793

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

859

ret = errno;

794

ret_errno = errno;

860

795

}

861

796

errno = old_errno;

862

return ret;

797

return ret_errno;

863

798

}

864

799

865

800

/* Lower privileges permanently */

866

801

__attribute__((warn_unused_result))

867

int lower_privileges_permanently(void){

868

int old_errno = errno;

869

int ret = 0;

802

error_t lower_privileges_permanently(void){

803

error_t old_errno = errno;

804

error_t ret_errno = 0;

870

805

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

871

ret = errno;

806

ret_errno = errno;

872

807

}

873

808

errno = old_errno;

874

return ret;

809

return ret_errno;

875

810

}

876

811

877

812

/* Helper function to add_local_route() and delete_local_route() */

933

868

perror_plus("dup2(devnull, STDIN_FILENO)");

934

869

_exit(EX_OSERR);

935

870

}

936

ret = close(devnull);

871

ret = (int)TEMP_FAILURE_RETRY(close(devnull));

937

872

if(ret == -1){

938

873

perror_plus("close");

939

874

_exit(EX_OSERR);

956

891

helper, O_RDONLY));

957

892

if(helper_fd == -1){

958

893

perror_plus("openat");

959

close(helperdir_fd);

960

894

_exit(EX_UNAVAILABLE);

961

895

}

962

close(helperdir_fd);

896

TEMP_FAILURE_RETRY(close(helperdir_fd));

963

897

#ifdef __GNUC__

964

898

#pragma GCC diagnostic push

965

899

#pragma GCC diagnostic ignored "-Wcast-qual"

1084

1018

bool match = false;

1085

1019

{

1086

1020

char *interface = NULL;

1087

while((interface = argz_next(mc->interfaces,

1088

mc->interfaces_size,

1089

interface))){

1021

while((interface=argz_next(mc->interfaces, mc->interfaces_size,

1022

interface))){

1090

1023

if(if_nametoindex(interface) == (unsigned int)if_index){

1091

1024

match = true;

1092

1025

break;

1134

1067

goto mandos_end;

1135

1068

}

1136

1069

1070

memset(&to, 0, sizeof(to));

1137

1071

if(af == AF_INET6){

1138

struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;

1139

*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };

1140

ret = inet_pton(af, ip, &to6->sin6_addr);

1072

((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;

1073

ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);

1141

1074

} else { /* IPv4 */

1142

struct sockaddr_in *to4 = (struct sockaddr_in *)&to;

1143

*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };

1144

ret = inet_pton(af, ip, &to4->sin_addr);

1075

((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;

1076

ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);

1145

1077

}

1146

1078

if(ret < 0 ){

1147

1079

int e = errno;

1226

1158

sizeof(struct sockaddr_in));

1227

1159

}

1228

1160

if(ret < 0){

1229

if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))

1161

if(errno == ENETUNREACH

1230

1162

and if_index != AVAHI_IF_UNSPEC

1231

1163

and connect_to == NULL

1232

1164

and not route_added and

1245

1177

with an explicit route added with the server's address.

1246

1178

1247

1179

Avahi bug reference:

1248

https://lists.freedesktop.org/archives/avahi/2010-February/001833.html

1180

http://lists.freedesktop.org/archives/avahi/2010-February/001833.html

1249

1181

https://bugs.debian.org/587961

1250

1182

*/

1251

1183

if(debug){

1431

1363

&decrypted_buffer, mc);

1432

1364

if(decrypted_buffer_size >= 0){

1433

1365

1434

clearerr(stdout);

1435

1366

written = 0;

1436

1367

while(written < (size_t) decrypted_buffer_size){

1437

1368

if(quit_now){

1453

1384

}

1454

1385

written += (size_t)ret;

1455

1386

}

1456

ret = fflush(stdout);

1457

if(ret != 0){

1458

int e = errno;

1459

if(debug){

1460

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

1461

strerror(errno));

1462

}

1463

errno = e;

1464

goto mandos_end;

1465

}

1466

1387

retval = 0;

1467

1388

}

1468

1389

}

1481

1402

free(decrypted_buffer);

1482

1403

free(buffer);

1483

1404

if(tcp_sd >= 0){

1484

ret = close(tcp_sd);

1405

ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));

1485

1406

}

1486

1407

if(ret == -1){

1487

1408

if(e == 0){

1499

1420

return retval;

1500

1421

}

1501

1422

1423

__attribute__((nonnull))

1502

1424

static void resolve_callback(AvahiSServiceResolver *r,

1503

1425

AvahiIfIndex interface,

1504

1426

AvahiProtocol proto,

1641

1563

__attribute__((nonnull, warn_unused_result))

1642

1564

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

1643

1565

int ret;

1644

int old_errno;

1566

error_t ret_errno;

1645

1567

1646

1568

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

1647

1569

if(s < 0){

1648

old_errno = errno;

1570

ret_errno = errno;

1649

1571

perror_plus("socket");

1650

errno = old_errno;

1572

errno = ret_errno;

1651

1573

return false;

1652

1574

}

1653

strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);

1654

ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */

1575

strcpy(ifr->ifr_name, ifname);

1655

1576

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1656

1577

if(ret == -1){

1657

1578

if(debug){

1658

old_errno = errno;

1579

ret_errno = errno;

1659

1580

perror_plus("ioctl SIOCGIFFLAGS");

1660

errno = old_errno;

1661

}

1662

if((close(s) == -1) and debug){

1663

old_errno = errno;

1664

perror_plus("close");

1665

errno = old_errno;

1581

errno = ret_errno;

1666

1582

}

1667

1583

return false;

1668

1584

}

1669

if((close(s) == -1) and debug){

1670

old_errno = errno;

1671

perror_plus("close");

1672

errno = old_errno;

1673

}

1674

1585

return true;

1675

1586

}

1676

1587

1937

1848

return;

1938

1849

}

1939

1850

}

1940

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

1941

if(devnull == -1){

1942

perror_plus("open(\"/dev/null\", O_RDONLY)");

1943

return;

1944

}

1851

#ifdef __GLIBC__

1852

#if __GLIBC_PREREQ(2, 15)

1945

1853

int numhooks = scandirat(hookdir_fd, ".", &direntries,

1946

1854

runnable_hook, alphasort);

1855

#else /* not __GLIBC_PREREQ(2, 15) */

1856

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

1857

alphasort);

1858

#endif /* not __GLIBC_PREREQ(2, 15) */

1859

#else /* not __GLIBC__ */

1860

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

1861

alphasort);

1862

#endif /* not __GLIBC__ */

1947

1863

if(numhooks == -1){

1948

1864

perror_plus("scandir");

1949

close(devnull);

1950

1865

return;

1951

1866

}

1952

1867

struct dirent *direntry;

1953

1868

int ret;

1869

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

1870

if(devnull == -1){

1871

perror_plus("open(\"/dev/null\", O_RDONLY)");

1872

return;

1873

}

1954

1874

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

1955

1875

direntry = direntries[i];

1956

1876

if(debug){

2027

1947

perror_plus("openat");

2028

1948

_exit(EXIT_FAILURE);

2029

1949

}

2030

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

1950

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

2031

1951

perror_plus("close");

2032

1952

_exit(EXIT_FAILURE);

2033

1953

}

2036

1956

perror_plus("dup2(devnull, STDIN_FILENO)");

2037

1957

_exit(EX_OSERR);

2038

1958

}

2039

ret = close(devnull);

1959

ret = (int)TEMP_FAILURE_RETRY(close(devnull));

2040

1960

if(ret == -1){

2041

1961

perror_plus("close");

2042

1962

_exit(EX_OSERR);

2091

2011

free(direntry);

2092

2012

}

2093

2013

free(direntries);

2094

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

2014

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

2095

2015

perror_plus("close");

2096

2016

} else {

2097

2017

hookdir_fd = -1;

2100

2020

}

2101

2021

2102

2022

__attribute__((nonnull, warn_unused_result))

2103

int bring_up_interface(const char *const interface,

2104

const float delay){

2105

int old_errno = errno;

2023

error_t bring_up_interface(const char *const interface,

2024

const float delay){

2025

error_t old_errno = errno;

2106

2026

int ret;

2107

2027

struct ifreq network;

2108

2028

unsigned int if_index = if_nametoindex(interface);

2118

2038

}

2119

2039

2120

2040

if(not interface_is_up(interface)){

2121

int ret_errno = 0;

2122

int ioctl_errno = 0;

2041

error_t ret_errno = 0, ioctl_errno = 0;

2123

2042

if(not get_flags(interface, &network)){

2124

2043

ret_errno = errno;

2125

2044

fprintf_plus(stderr, "Failed to get flags for interface "

2138

2057

}

2139

2058

2140

2059

if(quit_now){

2141

ret = close(sd);

2060

ret = (int)TEMP_FAILURE_RETRY(close(sd));

2142

2061

if(ret == -1){

2143

2062

perror_plus("close");

2144

2063

}

2194

2113

}

2195

2114

2196

2115

/* Close the socket */

2197

ret = close(sd);

2116

ret = (int)TEMP_FAILURE_RETRY(close(sd));

2198

2117

if(ret == -1){

2199

2118

perror_plus("close");

2200

2119

}

2212

2131

2213

2132

/* Sleep checking until interface is running.

2214

2133

Check every 0.25s, up to total time of delay */

2215

for(int i = 0; i < delay * 4; i++){

2134

for(int i=0; i < delay * 4; i++){

2216

2135

if(interface_is_running(interface)){

2217

2136

break;

2218

2137

}

2228

2147

}

2229

2148

2230

2149

__attribute__((nonnull, warn_unused_result))

2231

int take_down_interface(const char *const interface){

2232

int old_errno = errno;

2150

error_t take_down_interface(const char *const interface){

2151

error_t old_errno = errno;

2233

2152

struct ifreq network;

2234

2153

unsigned int if_index = if_nametoindex(interface);

2235

2154

if(if_index == 0){

2238

2157

return ENXIO;

2239

2158

}

2240

2159

if(interface_is_up(interface)){

2241

int ret_errno = 0;

2242

int ioctl_errno = 0;

2160

error_t ret_errno = 0, ioctl_errno = 0;

2243

2161

if(not get_flags(interface, &network) and debug){

2244

2162

ret_errno = errno;

2245

2163

fprintf_plus(stderr, "Failed to get flags for interface "

2283

2201

}

2284

2202

2285

2203

/* Close the socket */

2286

int ret = close(sd);

2204

int ret = (int)TEMP_FAILURE_RETRY(close(sd));

2287

2205

if(ret == -1){

2288

2206

perror_plus("close");

2289

2207

}

2305

2223

2306

2224

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

2307

2225

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

2308

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

2309

":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",

2310

.current_server = NULL, .interfaces = NULL,

2311

.interfaces_size = 0 };

2226

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

2227

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

2228

.interfaces = NULL, .interfaces_size = 0 };

2312

2229

AvahiSServiceBrowser *sb = NULL;

2313

2230

error_t ret_errno;

2314

2231

int ret;

2323

2240

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2324

2241

const char *seckey = PATHDIR "/" SECKEY;

2325

2242

const char *pubkey = PATHDIR "/" PUBKEY;

2326

const char *dh_params_file = NULL;

2327

2243

char *interfaces_hooks = NULL;

2328

2244

2329

2245

bool gnutls_initialized = false;

2382

2298

.doc = "Bit length of the prime number used in the"

2383

2299

" Diffie-Hellman key exchange",

2384

2300

.group = 2 },

2385

{ .name = "dh-params", .key = 134,

2386

.arg = "FILE",

2387

.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"

2388

" for the Diffie-Hellman key exchange",

2389

.group = 2 },

2390

2301

{ .name = "priority", .key = 130,

2391

2302

.arg = "STRING",

2392

2303

.doc = "GnuTLS priority string for the TLS handshake",

2447

2358

}

2448

2359

mc.dh_bits = (typeof(mc.dh_bits))tmpmax;

2449

2360

break;

2450

case 134: /* --dh-params */

2451

dh_params_file = arg;

2452

break;

2453

2361

case 130: /* --priority */

2454

2362

mc.priority = arg;

2455

2363

break;

2495

2403

.args_doc = "",

2496

2404

.doc = "Mandos client -- Get and decrypt"

2497

2405

" passwords from a Mandos server" };

2498

ret_errno = argp_parse(&argp, argc, argv,

2499

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2500

switch(ret_errno){

2406

ret = argp_parse(&argp, argc, argv,

2407

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2408

switch(ret){

2501

2409

case 0:

2502

2410

break;

2503

2411

case ENOMEM:

2504

2412

default:

2505

errno = ret_errno;

2413

errno = ret;

2506

2414

perror_plus("argp_parse");

2507

2415

exitcode = EX_OSERR;

2508

2416

goto end;

2514

2422

2515

2423

{

2516

2424

/* Work around Debian bug #633582:

2517

<https://bugs.debian.org/633582> */

2425

<http://bugs.debian.org/633582> */

2518

2426

2519

2427

/* Re-raise privileges */

2520

ret = raise_privileges();

2521

if(ret != 0){

2522

errno = ret;

2428

ret_errno = raise_privileges();

2429

if(ret_errno != 0){

2430

errno = ret_errno;

2523

2431

perror_plus("Failed to raise privileges");

2524

2432

} else {

2525

2433

struct stat st;

2541

2449

}

2542

2450

}

2543

2451

}

2544

close(seckey_fd);

2452

TEMP_FAILURE_RETRY(close(seckey_fd));

2545

2453

}

2546

2454

}

2547

2455

2562

2470

}

2563

2471

}

2564

2472

}

2565

close(pubkey_fd);

2566

}

2567

}

2568

2569

if(dh_params_file != NULL

2570

and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){

2571

int dhparams_fd = open(dh_params_file, O_RDONLY);

2572

if(dhparams_fd == -1){

2573

perror_plus("open");

2574

} else {

2575

ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));

2576

if(ret == -1){

2577

perror_plus("fstat");

2578

} else {

2579

if(S_ISREG(st.st_mode)

2580

and st.st_uid == 0 and st.st_gid == 0){

2581

ret = fchown(dhparams_fd, uid, gid);

2582

if(ret == -1){

2583

perror_plus("fchown");

2584

}

2585

}

2586

}

2587

close(dhparams_fd);

2473

TEMP_FAILURE_RETRY(close(pubkey_fd));

2588

2474

}

2589

2475

}

2590

2476

2591

2477

/* Lower privileges */

2592

ret = lower_privileges();

2593

if(ret != 0){

2594

errno = ret;

2478

ret_errno = lower_privileges();

2479

if(ret_errno != 0){

2480

errno = ret_errno;

2595

2481

perror_plus("Failed to lower privileges");

2596

2482

}

2597

2483

}

2767

2653

errno = bring_up_interface(interface, delay);

2768

2654

if(not interface_was_up){

2769

2655

if(errno != 0){

2770

fprintf_plus(stderr, "Failed to bring up interface \"%s\":"

2771

" %s\n", interface, strerror(errno));

2656

perror_plus("Failed to bring up interface");

2772

2657

} else {

2773

2658

errno = argz_add(&interfaces_to_take_down,

2774

2659

&interfaces_to_take_down_size,

2797

2682

goto end;

2798

2683

}

2799

2684

2800

ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);

2685

ret = init_gnutls_global(pubkey, seckey, &mc);

2801

2686

if(ret == -1){

2802

2687

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

2803

2688

exitcode = EX_UNAVAILABLE;

2925

2810

2926

2811

/* Allocate a new server */

2927

2812

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2928

&config, NULL, NULL, &ret);

2813

&config, NULL, NULL, &ret_errno);

2929

2814

2930

2815

/* Free the Avahi configuration data */

2931

2816

avahi_server_config_free(&config);

2934

2819

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

2935

2820

if(mc.server == NULL){

2936

2821

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

2937

avahi_strerror(ret));

2822

avahi_strerror(ret_errno));

2938

2823

exitcode = EX_UNAVAILABLE;

2939

2824

goto end;

2940

2825

}

2975

2860

end:

2976

2861

2977

2862

if(debug){

2978

if(signal_received){

2979

fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",

2980

argv[0], signal_received,

2981

strsignal(signal_received));

2982

} else {

2983

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

2984

}

2863

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

2985

2864

}

2986

2865

2987

2866

/* Cleanup things */

2998

2877

2999

2878

if(gnutls_initialized){

3000

2879

gnutls_certificate_free_credentials(mc.cred);

2880

gnutls_global_deinit();

3001

2881

gnutls_dh_params_deinit(mc.dh_params);

3002

2882

}

3003

2883

3026

2906

3027

2907

/* Re-raise privileges */

3028

2908

{

3029

ret = raise_privileges();

3030

if(ret != 0){

3031

errno = ret;

2909

ret_errno = raise_privileges();

2910

if(ret_errno != 0){

2911

errno = ret_errno;

3032

2912

perror_plus("Failed to raise privileges");

3033

2913

} else {

3034

2914

3039

2919

/* Take down the network interfaces which were brought up */

3040

2920

{

3041

2921

char *interface = NULL;

3042

while((interface = argz_next(interfaces_to_take_down,

3043

interfaces_to_take_down_size,

3044

interface))){

3045

ret = take_down_interface(interface);

3046

if(ret != 0){

3047

errno = ret;

2922

while((interface=argz_next(interfaces_to_take_down,

2923

interfaces_to_take_down_size,

2924

interface))){

2925

ret_errno = take_down_interface(interface);

2926

if(ret_errno != 0){

2927

errno = ret_errno;

3048

2928

perror_plus("Failed to take down interface");

3049

2929

}

3050

2930

}

3055

2935

}

3056

2936

}

3057

2937

3058

ret = lower_privileges_permanently();

3059

if(ret != 0){

3060

errno = ret;

2938

ret_errno = lower_privileges_permanently();

2939

if(ret_errno != 0){

2940

errno = ret_errno;

3061

2941

perror_plus("Failed to lower privileges permanently");

3062

2942

}

3063

2943

}

3065

2945

free(interfaces_to_take_down);

3066

2946

free(interfaces_hooks);

3067

2947

3068

void clean_dir_at(int base, const char * const dirname,

3069

uintmax_t level){

3070

struct dirent **direntries = NULL;

3071

int dret;

3072

int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,

3073

O_RDONLY

3074

| O_NOFOLLOW

3075

| O_DIRECTORY

3076

| O_PATH));

3077

if(dir_fd == -1){

3078

perror_plus("open");

3079

return;

3080

}

3081

int numentries = scandirat(dir_fd, ".", &direntries,

3082

notdotentries, alphasort);

3083

if(numentries >= 0){

3084

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

3085

if(debug){

3086

fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",

3087

dirname, direntries[i]->d_name);

3088

}

3089

dret = unlinkat(dir_fd, direntries[i]->d_name, 0);

3090

if(dret == -1){

3091

if(errno == EISDIR){

3092

dret = unlinkat(dir_fd, direntries[i]->d_name,

3093

AT_REMOVEDIR);

3094

}

3095

if((dret == -1) and (errno == ENOTEMPTY)

3096

and (strcmp(direntries[i]->d_name, "private-keys-v1.d")

3097

== 0) and (level == 0)){

3098

/* Recurse only in this special case */

3099

clean_dir_at(dir_fd, direntries[i]->d_name, level+1);

3100

dret = 0;

3101

}

3102

if((dret == -1) and (errno != ENOENT)){

3103

fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,

3104

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

3105

}

3106

}

3107

free(direntries[i]);

3108

}

3109

3110

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

3111

free(direntries);

3112

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3113

if(dret == -1 and errno != ENOENT){

3114

perror_plus("rmdir");

3115

}

3116

} else {

3117

perror_plus("scandirat");

3118

}

3119

close(dir_fd);

3120

}

3121

3122

2948

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

3123

2949

if(tempdir != NULL){

3124

clean_dir_at(-1, tempdir, 0);

2950

struct dirent **direntries = NULL;

2951

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

2952

| O_NOFOLLOW

2953

| O_DIRECTORY

2954

| O_PATH));

2955

if(tempdir_fd == -1){

2956

perror_plus("open");

2957

} else {

2958

#ifdef __GLIBC__

2959

#if __GLIBC_PREREQ(2, 15)

2960

int numentries = scandirat(tempdir_fd, ".", &direntries,

2961

notdotentries, alphasort);

2962

#else /* not __GLIBC_PREREQ(2, 15) */

2963

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

2964

alphasort);

2965

#endif /* not __GLIBC_PREREQ(2, 15) */

2966

#else /* not __GLIBC__ */

2967

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

2968

alphasort);

2969

#endif /* not __GLIBC__ */

2970

if(numentries >= 0){

2971

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

2972

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

2973

if(ret == -1){

2974

fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"

2975

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

2976

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

2977

}

2978

free(direntries[i]);

2979

}

2980

2981

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

2982

free(direntries);

2983

if(numentries == -1){

2984

perror_plus("scandir");

2985

}

2986

ret = rmdir(tempdir);

2987

if(ret == -1 and errno != ENOENT){

2988

perror_plus("rmdir");

2989

}

2990

}

2991

TEMP_FAILURE_RETRY(close(tempdir_fd));

2992

}

3125

2993

}

3126

2994

3127

2995

if(quit_now){