/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

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);

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);

679

627

if(ret != GNUTLS_E_SUCCESS){

680

fprintf_plus(stderr, "Error initializing OpenPGP key"

681

" structure: %s",

628

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

682

629

safer_gnutls_strerror(ret));

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

}

630

privkey = NULL;

707

631

}

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)));

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

}

717

644

}

718

645

}

719

646

}

720

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

721

if(uret != 0){

722

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;

723

650

if(debug){

724

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

725

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

651

fprintf_plus(stderr, "Falling back to security parameter"

652

" \"%s\"\n",

726

653

safe_string(gnutls_sec_param_get_name

727

(sec_param)),

728

mc->dh_bits);

654

(sec_param)));

729

655

}

730

} else {

731

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

732

" 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",

733

664

safe_string(gnutls_sec_param_get_name

734

665

(sec_param)),

735

safer_gnutls_strerror(ret));

736

goto globalfail;

666

mc->dh_bits);

737

667

}

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,

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)),

746

672

safer_gnutls_strerror(ret));

747

673

goto globalfail;

748

674

}

749

}

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

750

686

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

751

687

752

688

return 0;

754

690

globalfail:

755

691

756

692

gnutls_certificate_free_credentials(mc->cred);

693

gnutls_global_deinit();

757

694

gnutls_dh_params_deinit(mc->dh_params);

758

695

return -1;

759

696

}

811

748

/* ignore client certificate if any. */

812

749

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

813

750

751

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

752

814

753

return 0;

815

754

}

816

755

820

759

821

760

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

822

761

__attribute__((warn_unused_result))

823

int raise_privileges(void){

824

int old_errno = errno;

825

int ret = 0;

762

error_t raise_privileges(void){

763

error_t old_errno = errno;

764

error_t ret_errno = 0;

826

765

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

827

ret = errno;

766

ret_errno = errno;

828

767

}

829

768

errno = old_errno;

830

return ret;

769

return ret_errno;

831

770

}

832

771

833

772

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

834

773

__attribute__((warn_unused_result))

835

int raise_privileges_permanently(void){

836

int old_errno = errno;

837

int ret = raise_privileges();

838

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){

839

778

errno = old_errno;

840

return ret;

779

return ret_errno;

841

780

}

842

781

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

843

ret = errno;

782

ret_errno = errno;

844

783

}

845

784

errno = old_errno;

846

return ret;

785

return ret_errno;

847

786

}

848

787

849

788

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

850

789

__attribute__((warn_unused_result))

851

int lower_privileges(void){

852

int old_errno = errno;

853

int ret = 0;

790

error_t lower_privileges(void){

791

error_t old_errno = errno;

792

error_t ret_errno = 0;

854

793

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

855

ret = errno;

794

ret_errno = errno;

856

795

}

857

796

errno = old_errno;

858

return ret;

797

return ret_errno;

859

798

}

860

799

861

800

/* Lower privileges permanently */

862

801

__attribute__((warn_unused_result))

863

int lower_privileges_permanently(void){

864

int old_errno = errno;

865

int ret = 0;

802

error_t lower_privileges_permanently(void){

803

error_t old_errno = errno;

804

error_t ret_errno = 0;

866

805

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

867

ret = errno;

806

ret_errno = errno;

868

807

}

869

808

errno = old_errno;

870

return ret;

809

return ret_errno;

871

810

}

872

811

873

812

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

929

868

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

930

869

_exit(EX_OSERR);

931

870

}

932

ret = close(devnull);

871

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

933

872

if(ret == -1){

934

873

perror_plus("close");

935

874

_exit(EX_OSERR);

952

891

helper, O_RDONLY));

953

892

if(helper_fd == -1){

954

893

perror_plus("openat");

955

close(helperdir_fd);

956

894

_exit(EX_UNAVAILABLE);

957

895

}

958

close(helperdir_fd);

896

TEMP_FAILURE_RETRY(close(helperdir_fd));

959

897

#ifdef __GNUC__

960

898

#pragma GCC diagnostic push

961

899

#pragma GCC diagnostic ignored "-Wcast-qual"

1080

1018

bool match = false;

1081

1019

{

1082

1020

char *interface = NULL;

1083

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

1084

mc->interfaces_size,

1085

interface))){

1021

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

1022

interface))){

1086

1023

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

1087

1024

match = true;

1088

1025

break;

1130

1067

goto mandos_end;

1131

1068

}

1132

1069

1070

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

1133

1071

if(af == AF_INET6){

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);

1072

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

1073

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

1137

1074

} else { /* IPv4 */

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);

1075

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

1076

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

1141

1077

}

1142

1078

if(ret < 0 ){

1143

1079

int e = errno;

1222

1158

sizeof(struct sockaddr_in));

1223

1159

}

1224

1160

if(ret < 0){

1225

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

1161

if(errno == ENETUNREACH

1226

1162

and if_index != AVAHI_IF_UNSPEC

1227

1163

and connect_to == NULL

1228

1164

and not route_added and

1241

1177

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

1242

1178

1243

1179

Avahi bug reference:

1244

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

1180

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

1245

1181

https://bugs.debian.org/587961

1246

1182

*/

1247

1183

if(debug){

1427

1363

&decrypted_buffer, mc);

1428

1364

if(decrypted_buffer_size >= 0){

1429

1365

1430

clearerr(stdout);

1431

1366

written = 0;

1432

1367

while(written < (size_t) decrypted_buffer_size){

1433

1368

if(quit_now){

1449

1384

}

1450

1385

written += (size_t)ret;

1451

1386

}

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

}

1462

1387

retval = 0;

1463

1388

}

1464

1389

}

1477

1402

free(decrypted_buffer);

1478

1403

free(buffer);

1479

1404

if(tcp_sd >= 0){

1480

ret = close(tcp_sd);

1405

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

1481

1406

}

1482

1407

if(ret == -1){

1483

1408

if(e == 0){

1495

1420

return retval;

1496

1421

}

1497

1422

1423

__attribute__((nonnull))

1498

1424

static void resolve_callback(AvahiSServiceResolver *r,

1499

1425

AvahiIfIndex interface,

1500

1426

AvahiProtocol proto,

1637

1563

__attribute__((nonnull, warn_unused_result))

1638

1564

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

1639

1565

int ret;

1640

int old_errno;

1566

error_t ret_errno;

1641

1567

1642

1568

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

1643

1569

if(s < 0){

1644

old_errno = errno;

1570

ret_errno = errno;

1645

1571

perror_plus("socket");

1646

errno = old_errno;

1572

errno = ret_errno;

1647

1573

return false;

1648

1574

}

1649

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

1650

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

1575

strcpy(ifr->ifr_name, ifname);

1651

1576

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1652

1577

if(ret == -1){

1653

1578

if(debug){

1654

old_errno = errno;

1579

ret_errno = errno;

1655

1580

perror_plus("ioctl SIOCGIFFLAGS");

1656

errno = old_errno;

1581

errno = ret_errno;

1657

1582

}

1658

1583

return false;

1659

1584

}

1923

1848

return;

1924

1849

}

1925

1850

}

1926

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

1927

if(devnull == -1){

1928

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

1929

return;

1930

}

1851

#ifdef __GLIBC__

1852

#if __GLIBC_PREREQ(2, 15)

1931

1853

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

1932

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__ */

1933

1863

if(numhooks == -1){

1934

1864

perror_plus("scandir");

1935

close(devnull);

1936

1865

return;

1937

1866

}

1938

1867

struct dirent *direntry;

1939

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

}

1940

1874

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

1941

1875

direntry = direntries[i];

1942

1876

if(debug){

2013

1947

perror_plus("openat");

2014

1948

_exit(EXIT_FAILURE);

2015

1949

}

2016

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

1950

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

2017

1951

perror_plus("close");

2018

1952

_exit(EXIT_FAILURE);

2019

1953

}

2022

1956

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

2023

1957

_exit(EX_OSERR);

2024

1958

}

2025

ret = close(devnull);

1959

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

2026

1960

if(ret == -1){

2027

1961

perror_plus("close");

2028

1962

_exit(EX_OSERR);

2077

2011

free(direntry);

2078

2012

}

2079

2013

free(direntries);

2080

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

2014

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

2081

2015

perror_plus("close");

2082

2016

} else {

2083

2017

hookdir_fd = -1;

2086

2020

}

2087

2021

2088

2022

__attribute__((nonnull, warn_unused_result))

2089

int bring_up_interface(const char *const interface,

2090

const float delay){

2091

int old_errno = errno;

2023

error_t bring_up_interface(const char *const interface,

2024

const float delay){

2025

error_t old_errno = errno;

2092

2026

int ret;

2093

2027

struct ifreq network;

2094

2028

unsigned int if_index = if_nametoindex(interface);

2104

2038

}

2105

2039

2106

2040

if(not interface_is_up(interface)){

2107

int ret_errno = 0;

2108

int ioctl_errno = 0;

2041

error_t ret_errno = 0, ioctl_errno = 0;

2109

2042

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

2110

2043

ret_errno = errno;

2111

2044

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

2124

2057

}

2125

2058

2126

2059

if(quit_now){

2127

ret = close(sd);

2060

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

2128

2061

if(ret == -1){

2129

2062

perror_plus("close");

2130

2063

}

2180

2113

}

2181

2114

2182

2115

/* Close the socket */

2183

ret = close(sd);

2116

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

2184

2117

if(ret == -1){

2185

2118

perror_plus("close");

2186

2119

}

2198

2131

2199

2132

/* Sleep checking until interface is running.

2200

2133

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

2201

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

2134

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

2202

2135

if(interface_is_running(interface)){

2203

2136

break;

2204

2137

}

2214

2147

}

2215

2148

2216

2149

__attribute__((nonnull, warn_unused_result))

2217

int take_down_interface(const char *const interface){

2218

int old_errno = errno;

2150

error_t take_down_interface(const char *const interface){

2151

error_t old_errno = errno;

2219

2152

struct ifreq network;

2220

2153

unsigned int if_index = if_nametoindex(interface);

2221

2154

if(if_index == 0){

2224

2157

return ENXIO;

2225

2158

}

2226

2159

if(interface_is_up(interface)){

2227

int ret_errno = 0;

2228

int ioctl_errno = 0;

2160

error_t ret_errno = 0, ioctl_errno = 0;

2229

2161

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

2230

2162

ret_errno = errno;

2231

2163

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

2269

2201

}

2270

2202

2271

2203

/* Close the socket */

2272

int ret = close(sd);

2204

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

2273

2205

if(ret == -1){

2274

2206

perror_plus("close");

2275

2207

}

2291

2223

2292

2224

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

2293

2225

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

2294

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

2295

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

2296

.current_server = NULL, .interfaces = NULL,

2297

.interfaces_size = 0 };

2226

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

2227

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

2228

.interfaces = NULL, .interfaces_size = 0 };

2298

2229

AvahiSServiceBrowser *sb = NULL;

2299

2230

error_t ret_errno;

2300

2231

int ret;

2309

2240

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2310

2241

const char *seckey = PATHDIR "/" SECKEY;

2311

2242

const char *pubkey = PATHDIR "/" PUBKEY;

2312

const char *dh_params_file = NULL;

2313

2243

char *interfaces_hooks = NULL;

2314

2244

2315

2245

bool gnutls_initialized = false;

2368

2298

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

2369

2299

" Diffie-Hellman key exchange",

2370

2300

.group = 2 },

2371

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

2372

.arg = "FILE",

2373

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

2374

" for the Diffie-Hellman key exchange",

2375

.group = 2 },

2376

2301

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

2377

2302

.arg = "STRING",

2378

2303

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

2433

2358

}

2434

2359

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

2435

2360

break;

2436

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

2437

dh_params_file = arg;

2438

break;

2439

2361

case 130: /* --priority */

2440

2362

mc.priority = arg;

2441

2363

break;

2481

2403

.args_doc = "",

2482

2404

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

2483

2405

" passwords from a Mandos server" };

2484

ret_errno = argp_parse(&argp, argc, argv,

2485

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2486

switch(ret_errno){

2406

ret = argp_parse(&argp, argc, argv,

2407

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2408

switch(ret){

2487

2409

case 0:

2488

2410

break;

2489

2411

case ENOMEM:

2490

2412

default:

2491

errno = ret_errno;

2413

errno = ret;

2492

2414

perror_plus("argp_parse");

2493

2415

exitcode = EX_OSERR;

2494

2416

goto end;

2500

2422

2501

2423

{

2502

2424

/* Work around Debian bug #633582:

2503

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

2425

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

2504

2426

2505

2427

/* Re-raise privileges */

2506

ret = raise_privileges();

2507

if(ret != 0){

2508

errno = ret;

2428

ret_errno = raise_privileges();

2429

if(ret_errno != 0){

2430

errno = ret_errno;

2509

2431

perror_plus("Failed to raise privileges");

2510

2432

} else {

2511

2433

struct stat st;

2527

2449

}

2528

2450

}

2529

2451

}

2530

close(seckey_fd);

2452

TEMP_FAILURE_RETRY(close(seckey_fd));

2531

2453

}

2532

2454

}

2533

2455

2548

2470

}

2549

2471

}

2550

2472

}

2551

close(pubkey_fd);

2552

}

2553

}

2554

2555

if(dh_params_file != NULL

2556

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

2557

int dhparams_fd = open(dh_params_file, O_RDONLY);

2558

if(dhparams_fd == -1){

2559

perror_plus("open");

2560

} else {

2561

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

2562

if(ret == -1){

2563

perror_plus("fstat");

2564

} else {

2565

if(S_ISREG(st.st_mode)

2566

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

2567

ret = fchown(dhparams_fd, uid, gid);

2568

if(ret == -1){

2569

perror_plus("fchown");

2570

}

2571

}

2572

}

2573

close(dhparams_fd);

2473

TEMP_FAILURE_RETRY(close(pubkey_fd));

2574

2474

}

2575

2475

}

2576

2476

2577

2477

/* Lower privileges */

2578

ret = lower_privileges();

2579

if(ret != 0){

2580

errno = ret;

2478

ret_errno = lower_privileges();

2479

if(ret_errno != 0){

2480

errno = ret_errno;

2581

2481

perror_plus("Failed to lower privileges");

2582

2482

}

2583

2483

}

2753

2653

errno = bring_up_interface(interface, delay);

2754

2654

if(not interface_was_up){

2755

2655

if(errno != 0){

2756

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

2757

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

2656

perror_plus("Failed to bring up interface");

2758

2657

} else {

2759

2658

errno = argz_add(&interfaces_to_take_down,

2760

2659

&interfaces_to_take_down_size,

2783

2682

goto end;

2784

2683

}

2785

2684

2786

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

2685

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

2787

2686

if(ret == -1){

2788

2687

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

2789

2688

exitcode = EX_UNAVAILABLE;

2911

2810

2912

2811

/* Allocate a new server */

2913

2812

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2914

&config, NULL, NULL, &ret);

2813

&config, NULL, NULL, &ret_errno);

2915

2814

2916

2815

/* Free the Avahi configuration data */

2917

2816

avahi_server_config_free(&config);

2920

2819

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

2921

2820

if(mc.server == NULL){

2922

2821

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

2923

avahi_strerror(ret));

2822

avahi_strerror(ret_errno));

2924

2823

exitcode = EX_UNAVAILABLE;

2925

2824

goto end;

2926

2825

}

2961

2860

end:

2962

2861

2963

2862

if(debug){

2964

if(signal_received){

2965

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

2966

argv[0], signal_received,

2967

strsignal(signal_received));

2968

} else {

2969

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

2970

}

2863

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

2971

2864

}

2972

2865

2973

2866

/* Cleanup things */

2984

2877

2985

2878

if(gnutls_initialized){

2986

2879

gnutls_certificate_free_credentials(mc.cred);

2880

gnutls_global_deinit();

2987

2881

gnutls_dh_params_deinit(mc.dh_params);

2988

2882

}

2989

2883

3012

2906

3013

2907

/* Re-raise privileges */

3014

2908

{

3015

ret = raise_privileges();

3016

if(ret != 0){

3017

errno = ret;

2909

ret_errno = raise_privileges();

2910

if(ret_errno != 0){

2911

errno = ret_errno;

3018

2912

perror_plus("Failed to raise privileges");

3019

2913

} else {

3020

2914

3025

2919

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

3026

2920

{

3027

2921

char *interface = NULL;

3028

while((interface = argz_next(interfaces_to_take_down,

3029

interfaces_to_take_down_size,

3030

interface))){

3031

ret = take_down_interface(interface);

3032

if(ret != 0){

3033

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;

3034

2928

perror_plus("Failed to take down interface");

3035

2929

}

3036

2930

}

3041

2935

}

3042

2936

}

3043

2937

3044

ret = lower_privileges_permanently();

3045

if(ret != 0){

3046

errno = ret;

2938

ret_errno = lower_privileges_permanently();

2939

if(ret_errno != 0){

2940

errno = ret_errno;

3047

2941

perror_plus("Failed to lower privileges permanently");

3048

2942

}

3049

2943

}

3051

2945

free(interfaces_to_take_down);

3052

2946

free(interfaces_hooks);

3053

2947

3054

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

3055

uintmax_t level){

3056

struct dirent **direntries = NULL;

3057

int dret;

3058

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

3059

O_RDONLY

3060

| O_NOFOLLOW

3061

| O_DIRECTORY

3062

| O_PATH));

3063

if(dir_fd == -1){

3064

perror_plus("open");

3065

return;

3066

}

3067

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

3068

notdotentries, alphasort);

3069

if(numentries >= 0){

3070

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

3071

if(debug){

3072

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

3073

dirname, direntries[i]->d_name);

3074

}

3075

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

3076

if(dret == -1){

3077

if(errno == EISDIR){

3078

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

3079

AT_REMOVEDIR);

3080

}

3081

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

3082

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

3083

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

3084

/* Recurse only in this special case */

3085

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

3086

dret = 0;

3087

}

3088

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

3089

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

3090

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

3091

}

3092

}

3093

free(direntries[i]);

3094

}

3095

3096

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

3097

free(direntries);

3098

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3099

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

3100

perror_plus("rmdir");

3101

}

3102

} else {

3103

perror_plus("scandirat");

3104

}

3105

close(dir_fd);

3106

}

3107

3108

2948

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

3109

2949

if(tempdir != NULL){

3110

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

}

3111

2993

}

3112

2994

3113

2995

if(quit_now){