/mandos/release : revision 237.7.475

9

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

10

*

11

* Everything else is

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

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

21

23

* WITHOUT ANY WARRANTY; without even the implied warranty of

22

24

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

23

25

* General Public License for more details.

24

26

*

25

27

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

26

* along with this program. If not, see

27

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

28

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

28

29

*

29

30

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

30

31

*/

46

47

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

47

48

strtof(), abort() */

48

49

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

49

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

50

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

50

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

51

asprintf(), strncpy(), strsignal()

52

*/

51

53

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

52

54

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

53

55

sockaddr_in6, PF_INET6,

57

59

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

58

60

inet_pton(), connect(),

59

61

getnameinfo() */

60

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

62

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

61

63

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

62

64

*/

63

65

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

64

66

strtoimax() */

65

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

67

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

68

EAI_SYSTEM, ENETUNREACH,

69

EHOSTUNREACH, ECONNREFUSED, EPROTO,

70

EIO, ENOENT, ENXIO, ENOMEM, EISDIR,

71

ENOTEMPTY,

66

72

program_invocation_short_name */

67

73

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

68

74

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

305

311

return false;

306

312

}

307

313

308

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

314

ret = close(fd);

309

315

if(ret == -1){

310

316

perror_plus("close");

311

317

}

513

519

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

514

520

}

515

521

516

__attribute__((nonnull, warn_unused_result))

522

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

517

523

static int init_gnutls_global(const char *pubkeyfilename,

518

524

const char *seckeyfilename,

525

const char *dhparamsfilename,

519

526

mandos_context *mc){

520

527

int ret;

521

528

unsigned int uret;

524

531

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

525

532

}

526

533

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();

548

547

return -1;

549

548

}

550

549

575

574

safer_gnutls_strerror(ret));

576

575

goto globalfail;

577

576

}

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;

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;

585

588

while(true){

586

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

587

(size_t)buffer.size,

588

(size_t)buffer_capacity);

589

if(buffer_capacity == 0){

589

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

590

(size_t)params.size,

591

(size_t)params_capacity);

592

if(params_capacity == 0){

590

593

perror_plus("incbuffer");

591

free(buffer.data);

592

buffer.data = NULL;

594

free(params.data);

595

params.data = NULL;

596

dhparamsfilename = NULL;

593

597

break;

594

598

}

595

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

599

ssize_t bytes_read = read(dhpfile,

600

params.data + params.size,

596

601

BUFFER_SIZE);

597

602

/* EOF */

598

603

if(bytes_read == 0){

601

606

/* check bytes_read for failure */

602

607

if(bytes_read < 0){

603

608

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);

609

free(params.data);

610

params.data = NULL;

611

dhparamsfilename = NULL;

612

break;

613

}

614

params.size += (unsigned int)bytes_read;

615

}

616

if(params.data == NULL){

617

dhparamsfilename = NULL;

618

}

619

if(dhparamsfilename == NULL){

620

break;

621

}

622

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

623

GNUTLS_X509_FMT_PEM);

624

if(ret != GNUTLS_E_SUCCESS){

625

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

626

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

627

safer_gnutls_strerror(ret));

628

dhparamsfilename = NULL;

629

}

630

free(params.data);

631

} while(false);

632

}

633

if(dhparamsfilename == NULL){

634

if(mc->dh_bits == 0){

635

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

636

/* Try to read the private key file */

637

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

638

do {

639

int secfile = open(seckeyfilename, O_RDONLY);

640

if(secfile == -1){

641

perror_plus("open");

642

break;

643

}

644

size_t buffer_capacity = 0;

645

while(true){

646

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

647

(size_t)buffer.size,

648

(size_t)buffer_capacity);

649

if(buffer_capacity == 0){

650

perror_plus("incbuffer");

651

free(buffer.data);

652

buffer.data = NULL;

653

break;

654

}

655

ssize_t bytes_read = read(secfile,

656

buffer.data + buffer.size,

657

BUFFER_SIZE);

658

/* EOF */

659

if(bytes_read == 0){

660

break;

661

}

662

/* check bytes_read for failure */

663

if(bytes_read < 0){

664

perror_plus("read");

665

free(buffer.data);

666

buffer.data = NULL;

667

break;

668

}

669

buffer.size += (unsigned int)bytes_read;

670

}

671

close(secfile);

672

} while(false);

673

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

674

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

675

if(buffer.data != NULL){

676

{

677

gnutls_openpgp_privkey_t privkey = NULL;

678

ret = gnutls_openpgp_privkey_init(&privkey);

627

679

if(ret != GNUTLS_E_SUCCESS){

628

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

680

fprintf_plus(stderr, "Error initializing OpenPGP key"

681

" structure: %s",

629

682

safer_gnutls_strerror(ret));

630

privkey = NULL;

683

free(buffer.data);

684

buffer.data = NULL;

685

} else {

686

ret = gnutls_openpgp_privkey_import

687

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

688

if(ret != GNUTLS_E_SUCCESS){

689

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

690

safer_gnutls_strerror(ret));

691

privkey = NULL;

692

}

693

free(buffer.data);

694

buffer.data = NULL;

695

if(privkey != NULL){

696

/* Use private key to suggest an appropriate

697

sec_param */

698

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

699

gnutls_openpgp_privkey_deinit(privkey);

700

if(debug){

701

fprintf_plus(stderr, "This OpenPGP key implies using"

702

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

703

safe_string(gnutls_sec_param_get_name

704

(sec_param)));

705

}

706

}

631

707

}

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

}

708

}

709

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

710

/* Err on the side of caution */

711

sec_param = GNUTLS_SEC_PARAM_ULTRA;

712

if(debug){

713

fprintf_plus(stderr, "Falling back to security parameter"

714

" \"%s\"\n",

715

safe_string(gnutls_sec_param_get_name

716

(sec_param)));

644

717

}

645

718

}

646

719

}

647

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

648

/* Err on the side of caution */

649

sec_param = GNUTLS_SEC_PARAM_ULTRA;

720

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

721

if(uret != 0){

722

mc->dh_bits = uret;

650

723

if(debug){

651

fprintf_plus(stderr, "Falling back to security parameter"

652

" \"%s\"\n",

724

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

725

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

653

726

safe_string(gnutls_sec_param_get_name

654

(sec_param)));

727

(sec_param)),

728

mc->dh_bits);

655

729

}

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",

730

} else {

731

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

732

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

664

733

safe_string(gnutls_sec_param_get_name

665

734

(sec_param)),

666

mc->dh_bits);

735

safer_gnutls_strerror(ret));

736

goto globalfail;

667

737

}

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)),

738

} else if(debug){

739

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

740

mc->dh_bits);

741

}

742

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

743

if(ret != GNUTLS_E_SUCCESS){

744

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

745

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

672

746

safer_gnutls_strerror(ret));

673

747

goto globalfail;

674

748

}

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

749

}

686

750

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

687

751

688

752

return 0;

690

754

globalfail:

691

755

692

756

gnutls_certificate_free_credentials(mc->cred);

693

gnutls_global_deinit();

694

757

gnutls_dh_params_deinit(mc->dh_params);

695

758

return -1;

696

759

}

748

811

/* ignore client certificate if any. */

749

812

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

750

813

751

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

752

753

814

return 0;

754

815

}

755

816

759

820

760

821

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

761

822

__attribute__((warn_unused_result))

762

error_t raise_privileges(void){

763

error_t old_errno = errno;

764

error_t ret_errno = 0;

823

int raise_privileges(void){

824

int old_errno = errno;

825

int ret = 0;

765

826

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

766

ret_errno = errno;

827

ret = errno;

767

828

}

768

829

errno = old_errno;

769

return ret_errno;

830

return ret;

770

831

}

771

832

772

833

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

773

834

__attribute__((warn_unused_result))

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){

835

int raise_privileges_permanently(void){

836

int old_errno = errno;

837

int ret = raise_privileges();

838

if(ret != 0){

778

839

errno = old_errno;

779

return ret_errno;

840

return ret;

780

841

}

781

842

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

782

ret_errno = errno;

843

ret = errno;

783

844

}

784

845

errno = old_errno;

785

return ret_errno;

846

return ret;

786

847

}

787

848

788

849

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

789

850

__attribute__((warn_unused_result))

790

error_t lower_privileges(void){

791

error_t old_errno = errno;

792

error_t ret_errno = 0;

851

int lower_privileges(void){

852

int old_errno = errno;

853

int ret = 0;

793

854

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

794

ret_errno = errno;

855

ret = errno;

795

856

}

796

857

errno = old_errno;

797

return ret_errno;

858

return ret;

798

859

}

799

860

800

861

/* Lower privileges permanently */

801

862

__attribute__((warn_unused_result))

802

error_t lower_privileges_permanently(void){

803

error_t old_errno = errno;

804

error_t ret_errno = 0;

863

int lower_privileges_permanently(void){

864

int old_errno = errno;

865

int ret = 0;

805

866

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

806

ret_errno = errno;

867

ret = errno;

807

868

}

808

869

errno = old_errno;

809

return ret_errno;

870

return ret;

810

871

}

811

872

812

873

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

868

929

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

869

930

_exit(EX_OSERR);

870

931

}

871

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

932

ret = close(devnull);

872

933

if(ret == -1){

873

934

perror_plus("close");

874

935

_exit(EX_OSERR);

891

952

helper, O_RDONLY));

892

953

if(helper_fd == -1){

893

954

perror_plus("openat");

955

close(helperdir_fd);

894

956

_exit(EX_UNAVAILABLE);

895

957

}

896

TEMP_FAILURE_RETRY(close(helperdir_fd));

958

close(helperdir_fd);

897

959

#ifdef __GNUC__

898

960

#pragma GCC diagnostic push

899

961

#pragma GCC diagnostic ignored "-Wcast-qual"

1018

1080

bool match = false;

1019

1081

{

1020

1082

char *interface = NULL;

1021

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

1022

interface))){

1083

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

1084

mc->interfaces_size,

1085

interface))){

1023

1086

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

1024

1087

match = true;

1025

1088

break;

1067

1130

goto mandos_end;

1068

1131

}

1069

1132

1070

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

1071

1133

if(af == AF_INET6){

1072

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

1073

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

1134

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

1135

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

1136

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

1074

1137

} else { /* IPv4 */

1075

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

1076

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

1138

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

1139

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

1140

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

1077

1141

}

1078

1142

if(ret < 0 ){

1079

1143

int e = errno;

1158

1222

sizeof(struct sockaddr_in));

1159

1223

}

1160

1224

if(ret < 0){

1161

if(errno == ENETUNREACH

1225

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

1162

1226

and if_index != AVAHI_IF_UNSPEC

1163

1227

and connect_to == NULL

1164

1228

and not route_added and

1177

1241

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

1178

1242

1179

1243

Avahi bug reference:

1180

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

1244

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

1181

1245

https://bugs.debian.org/587961

1182

1246

*/

1183

1247

if(debug){

1363

1427

&decrypted_buffer, mc);

1364

1428

if(decrypted_buffer_size >= 0){

1365

1429

1430

clearerr(stdout);

1366

1431

written = 0;

1367

1432

while(written < (size_t) decrypted_buffer_size){

1368

1433

if(quit_now){

1384

1449

}

1385

1450

written += (size_t)ret;

1386

1451

}

1452

ret = fflush(stdout);

1453

if(ret != 0){

1454

int e = errno;

1455

if(debug){

1456

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

1457

strerror(errno));

1458

}

1459

errno = e;

1460

goto mandos_end;

1461

}

1387

1462

retval = 0;

1388

1463

}

1389

1464

}

1402

1477

free(decrypted_buffer);

1403

1478

free(buffer);

1404

1479

if(tcp_sd >= 0){

1405

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

1480

ret = close(tcp_sd);

1406

1481

}

1407

1482

if(ret == -1){

1408

1483

if(e == 0){

1420

1495

return retval;

1421

1496

}

1422

1497

1423

__attribute__((nonnull))

1424

1498

static void resolve_callback(AvahiSServiceResolver *r,

1425

1499

AvahiIfIndex interface,

1426

1500

AvahiProtocol proto,

1563

1637

__attribute__((nonnull, warn_unused_result))

1564

1638

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

1565

1639

int ret;

1566

error_t ret_errno;

1640

int old_errno;

1567

1641

1568

1642

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

1569

1643

if(s < 0){

1570

ret_errno = errno;

1644

old_errno = errno;

1571

1645

perror_plus("socket");

1572

errno = ret_errno;

1646

errno = old_errno;

1573

1647

return false;

1574

1648

}

1575

strcpy(ifr->ifr_name, ifname);

1649

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

1650

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

1576

1651

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1577

1652

if(ret == -1){

1578

1653

if(debug){

1579

ret_errno = errno;

1654

old_errno = errno;

1580

1655

perror_plus("ioctl SIOCGIFFLAGS");

1581

errno = ret_errno;

1656

errno = old_errno;

1582

1657

}

1583

1658

return false;

1584

1659

}

1848

1923

return;

1849

1924

}

1850

1925

}

1851

#ifdef __GLIBC__

1852

#if __GLIBC_PREREQ(2, 15)

1853

1926

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

1854

1927

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__ */

1863

1928

if(numhooks == -1){

1864

1929

perror_plus("scandir");

1865

1930

return;

1947

2012

perror_plus("openat");

1948

2013

_exit(EXIT_FAILURE);

1949

2014

}

1950

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

2015

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

1951

2016

perror_plus("close");

1952

2017

_exit(EXIT_FAILURE);

1953

2018

}

1956

2021

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

1957

2022

_exit(EX_OSERR);

1958

2023

}

1959

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

2024

ret = close(devnull);

1960

2025

if(ret == -1){

1961

2026

perror_plus("close");

1962

2027

_exit(EX_OSERR);

2011

2076

free(direntry);

2012

2077

}

2013

2078

free(direntries);

2014

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

2079

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

2015

2080

perror_plus("close");

2016

2081

} else {

2017

2082

hookdir_fd = -1;

2020

2085

}

2021

2086

2022

2087

__attribute__((nonnull, warn_unused_result))

2023

error_t bring_up_interface(const char *const interface,

2024

const float delay){

2025

error_t old_errno = errno;

2088

int bring_up_interface(const char *const interface,

2089

const float delay){

2090

int old_errno = errno;

2026

2091

int ret;

2027

2092

struct ifreq network;

2028

2093

unsigned int if_index = if_nametoindex(interface);

2038

2103

}

2039

2104

2040

2105

if(not interface_is_up(interface)){

2041

error_t ret_errno = 0, ioctl_errno = 0;

2106

int ret_errno = 0;

2107

int ioctl_errno = 0;

2042

2108

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

2043

2109

ret_errno = errno;

2044

2110

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

2057

2123

}

2058

2124

2059

2125

if(quit_now){

2060

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

2126

ret = close(sd);

2061

2127

if(ret == -1){

2062

2128

perror_plus("close");

2063

2129

}

2113

2179

}

2114

2180

2115

2181

/* Close the socket */

2116

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

2182

ret = close(sd);

2117

2183

if(ret == -1){

2118

2184

perror_plus("close");

2119

2185

}

2131

2197

2132

2198

/* Sleep checking until interface is running.

2133

2199

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

2134

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

2200

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

2135

2201

if(interface_is_running(interface)){

2136

2202

break;

2137

2203

}

2147

2213

}

2148

2214

2149

2215

__attribute__((nonnull, warn_unused_result))

2150

error_t take_down_interface(const char *const interface){

2151

error_t old_errno = errno;

2216

int take_down_interface(const char *const interface){

2217

int old_errno = errno;

2152

2218

struct ifreq network;

2153

2219

unsigned int if_index = if_nametoindex(interface);

2154

2220

if(if_index == 0){

2157

2223

return ENXIO;

2158

2224

}

2159

2225

if(interface_is_up(interface)){

2160

error_t ret_errno = 0, ioctl_errno = 0;

2226

int ret_errno = 0;

2227

int ioctl_errno = 0;

2161

2228

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

2162

2229

ret_errno = errno;

2163

2230

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

2201

2268

}

2202

2269

2203

2270

/* Close the socket */

2204

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

2271

int ret = close(sd);

2205

2272

if(ret == -1){

2206

2273

perror_plus("close");

2207

2274

}

2223

2290

2224

2291

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

2225

2292

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

2226

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

2227

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

2228

.interfaces = NULL, .interfaces_size = 0 };

2293

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

2294

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

2295

.current_server = NULL, .interfaces = NULL,

2296

.interfaces_size = 0 };

2229

2297

AvahiSServiceBrowser *sb = NULL;

2230

2298

error_t ret_errno;

2231

2299

int ret;

2240

2308

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2241

2309

const char *seckey = PATHDIR "/" SECKEY;

2242

2310

const char *pubkey = PATHDIR "/" PUBKEY;

2311

const char *dh_params_file = NULL;

2243

2312

char *interfaces_hooks = NULL;

2244

2313

2245

2314

bool gnutls_initialized = false;

2298

2367

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

2299

2368

" Diffie-Hellman key exchange",

2300

2369

.group = 2 },

2370

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

2371

.arg = "FILE",

2372

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

2373

" for the Diffie-Hellman key exchange",

2374

.group = 2 },

2301

2375

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

2302

2376

.arg = "STRING",

2303

2377

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

2358

2432

}

2359

2433

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

2360

2434

break;

2435

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

2436

dh_params_file = arg;

2437

break;

2361

2438

case 130: /* --priority */

2362

2439

mc.priority = arg;

2363

2440

break;

2403

2480

.args_doc = "",

2404

2481

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

2405

2482

" passwords from a Mandos server" };

2406

ret = argp_parse(&argp, argc, argv,

2407

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2408

switch(ret){

2483

ret_errno = argp_parse(&argp, argc, argv,

2484

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2485

switch(ret_errno){

2409

2486

case 0:

2410

2487

break;

2411

2488

case ENOMEM:

2412

2489

default:

2413

errno = ret;

2490

errno = ret_errno;

2414

2491

perror_plus("argp_parse");

2415

2492

exitcode = EX_OSERR;

2416

2493

goto end;

2422

2499

2423

2500

{

2424

2501

/* Work around Debian bug #633582:

2425

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

2502

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

2426

2503

2427

2504

/* Re-raise privileges */

2428

ret_errno = raise_privileges();

2429

if(ret_errno != 0){

2430

errno = ret_errno;

2505

ret = raise_privileges();

2506

if(ret != 0){

2507

errno = ret;

2431

2508

perror_plus("Failed to raise privileges");

2432

2509

} else {

2433

2510

struct stat st;

2449

2526

}

2450

2527

}

2451

2528

}

2452

TEMP_FAILURE_RETRY(close(seckey_fd));

2529

close(seckey_fd);

2453

2530

}

2454

2531

}

2455

2532

2470

2547

}

2471

2548

}

2472

2549

}

2473

TEMP_FAILURE_RETRY(close(pubkey_fd));

2550

close(pubkey_fd);

2551

}

2552

}

2553

2554

if(dh_params_file != NULL

2555

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

2556

int dhparams_fd = open(dh_params_file, O_RDONLY);

2557

if(dhparams_fd == -1){

2558

perror_plus("open");

2559

} else {

2560

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

2561

if(ret == -1){

2562

perror_plus("fstat");

2563

} else {

2564

if(S_ISREG(st.st_mode)

2565

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

2566

ret = fchown(dhparams_fd, uid, gid);

2567

if(ret == -1){

2568

perror_plus("fchown");

2569

}

2570

}

2571

}

2572

close(dhparams_fd);

2474

2573

}

2475

2574

}

2476

2575

2477

2576

/* Lower privileges */

2478

ret_errno = lower_privileges();

2479

if(ret_errno != 0){

2480

errno = ret_errno;

2577

ret = lower_privileges();

2578

if(ret != 0){

2579

errno = ret;

2481

2580

perror_plus("Failed to lower privileges");

2482

2581

}

2483

2582

}

2653

2752

errno = bring_up_interface(interface, delay);

2654

2753

if(not interface_was_up){

2655

2754

if(errno != 0){

2656

perror_plus("Failed to bring up interface");

2755

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

2756

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

2657

2757

} else {

2658

2758

errno = argz_add(&interfaces_to_take_down,

2659

2759

&interfaces_to_take_down_size,

2682

2782

goto end;

2683

2783

}

2684

2784

2685

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

2785

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

2686

2786

if(ret == -1){

2687

2787

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

2688

2788

exitcode = EX_UNAVAILABLE;

2810

2910

2811

2911

/* Allocate a new server */

2812

2912

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2813

&config, NULL, NULL, &ret_errno);

2913

&config, NULL, NULL, &ret);

2814

2914

2815

2915

/* Free the Avahi configuration data */

2816

2916

avahi_server_config_free(&config);

2819

2919

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

2820

2920

if(mc.server == NULL){

2821

2921

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

2822

avahi_strerror(ret_errno));

2922

avahi_strerror(ret));

2823

2923

exitcode = EX_UNAVAILABLE;

2824

2924

goto end;

2825

2925

}

2860

2960

end:

2861

2961

2862

2962

if(debug){

2863

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

2963

if(signal_received){

2964

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

2965

argv[0], signal_received,

2966

strsignal(signal_received));

2967

} else {

2968

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

2969

}

2864

2970

}

2865

2971

2866

2972

/* Cleanup things */

2877

2983

2878

2984

if(gnutls_initialized){

2879

2985

gnutls_certificate_free_credentials(mc.cred);

2880

gnutls_global_deinit();

2881

2986

gnutls_dh_params_deinit(mc.dh_params);

2882

2987

}

2883

2988

2906

3011

2907

3012

/* Re-raise privileges */

2908

3013

{

2909

ret_errno = raise_privileges();

2910

if(ret_errno != 0){

2911

errno = ret_errno;

3014

ret = raise_privileges();

3015

if(ret != 0){

3016

errno = ret;

2912

3017

perror_plus("Failed to raise privileges");

2913

3018

} else {

2914

3019

2919

3024

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

2920

3025

{

2921

3026

char *interface = NULL;

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;

3027

while((interface = argz_next(interfaces_to_take_down,

3028

interfaces_to_take_down_size,

3029

interface))){

3030

ret = take_down_interface(interface);

3031

if(ret != 0){

3032

errno = ret;

2928

3033

perror_plus("Failed to take down interface");

2929

3034

}

2930

3035

}

2935

3040

}

2936

3041

}

2937

3042

2938

ret_errno = lower_privileges_permanently();

2939

if(ret_errno != 0){

2940

errno = ret_errno;

3043

ret = lower_privileges_permanently();

3044

if(ret != 0){

3045

errno = ret;

2941

3046

perror_plus("Failed to lower privileges permanently");

2942

3047

}

2943

3048

}

2945

3050

free(interfaces_to_take_down);

2946

3051

free(interfaces_hooks);

2947

3052

3053

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

3054

uintmax_t level){

3055

struct dirent **direntries = NULL;

3056

int dret;

3057

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

3058

O_RDONLY

3059

| O_NOFOLLOW

3060

| O_DIRECTORY

3061

| O_PATH));

3062

if(dir_fd == -1){

3063

perror_plus("open");

3064

}

3065

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

3066

notdotentries, alphasort);

3067

if(numentries >= 0){

3068

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

3069

if(debug){

3070

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

3071

dirname, direntries[i]->d_name);

3072

}

3073

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

3074

if(dret == -1){

3075

if(errno == EISDIR){

3076

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

3077

AT_REMOVEDIR);

3078

}

3079

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

3080

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

3081

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

3082

/* Recurse only in this special case */

3083

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

3084

dret = 0;

3085

}

3086

if(dret == -1){

3087

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

3088

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

3089

}

3090

}

3091

free(direntries[i]);

3092

}

3093

3094

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

3095

free(direntries);

3096

if(numentries == -1){

3097

perror_plus("scandirat");

3098

}

3099

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3100

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

3101

perror_plus("rmdir");

3102

}

3103

} else {

3104

perror_plus("scandirat");

3105

}

3106

close(dir_fd);

3107

}

3108

2948

3109

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

2949

3110

if(tempdir != NULL){

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

}

3111

clean_dir_at(-1, tempdir, 0);

2993

3112

}

2994

3113

2995

3114

if(quit_now){