/mandos/release : revision 237.25.5

9

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

10

*

11

* Everything else is

12

13

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

46

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

47

strtof(), abort() */

48

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

49

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

50

asprintf(), strncpy(), strsignal()

51

*/

49

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

50

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

52

51

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

53

52

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

54

53

sockaddr_in6, PF_INET6,

58

57

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

59

58

inet_pton(), connect(),

60

59

getnameinfo() */

61

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

60

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

62

61

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

63

62

*/

64

63

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

65

64

strtoimax() */

66

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

67

EAI_SYSTEM, ENETUNREACH,

68

EHOSTUNREACH, ECONNREFUSED, EPROTO,

69

EIO, ENOENT, ENXIO, ENOMEM, EISDIR,

70

ENOTEMPTY,

65

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

71

66

program_invocation_short_name */

72

67

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

73

68

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

310

305

return false;

311

306

}

312

307

313

ret = close(fd);

308

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

314

309

if(ret == -1){

315

310

perror_plus("close");

316

311

}

498

493

return plaintext_length;

499

494

}

500

495

501

__attribute__((warn_unused_result, const))

502

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

503

if(str == NULL)

504

return "(unknown)";

505

return str;

506

}

507

508

496

__attribute__((warn_unused_result))

509

497

static const char *safer_gnutls_strerror(int value){

510

498

const char *ret = gnutls_strerror(value);

511

return safe_string(ret);

499

if(ret == NULL)

500

ret = "(unknown)";

501

return ret;

512

502

}

513

503

514

504

/* GnuTLS log function callback */

518

508

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

519

509

}

520

510

521

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

511

__attribute__((nonnull, warn_unused_result))

522

512

static int init_gnutls_global(const char *pubkeyfilename,

523

513

const char *seckeyfilename,

524

const char *dhparamsfilename,

525

514

mandos_context *mc){

526

515

int ret;

527

unsigned int uret;

528

516

529

517

if(debug){

530

518

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

531

519

}

532

520

521

ret = gnutls_global_init();

522

if(ret != GNUTLS_E_SUCCESS){

523

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

524

safer_gnutls_strerror(ret));

525

return -1;

526

}

527

533

528

if(debug){

534

529

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

535

530

* - GnuTLS manual

543

538

if(ret != GNUTLS_E_SUCCESS){

544

539

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

545

540

safer_gnutls_strerror(ret));

541

gnutls_global_deinit();

546

542

return -1;

547

543

}

548

544

573

569

safer_gnutls_strerror(ret));

574

570

goto globalfail;

575

571

}

576

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

577

if(dhparamsfilename != NULL){

578

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

579

do {

580

int dhpfile = open(dhparamsfilename, O_RDONLY);

581

if(dhpfile == -1){

582

perror_plus("open");

583

dhparamsfilename = NULL;

584

break;

585

}

586

size_t params_capacity = 0;

587

while(true){

588

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

589

(size_t)params.size,

590

(size_t)params_capacity);

591

if(params_capacity == 0){

592

perror_plus("incbuffer");

593

free(params.data);

594

params.data = NULL;

595

dhparamsfilename = NULL;

596

break;

597

}

598

ssize_t bytes_read = read(dhpfile,

599

params.data + params.size,

600

BUFFER_SIZE);

601

/* EOF */

602

if(bytes_read == 0){

603

break;

604

}

605

/* check bytes_read for failure */

606

if(bytes_read < 0){

607

perror_plus("read");

608

free(params.data);

609

params.data = NULL;

610

dhparamsfilename = NULL;

611

break;

612

}

613

params.size += (unsigned int)bytes_read;

614

}

615

if(params.data == NULL){

616

dhparamsfilename = NULL;

617

}

618

if(dhparamsfilename == NULL){

619

break;

620

}

621

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

622

GNUTLS_X509_FMT_PEM);

623

if(ret != GNUTLS_E_SUCCESS){

624

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

625

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

626

safer_gnutls_strerror(ret));

627

dhparamsfilename = NULL;

628

}

629

free(params.data);

630

} while(false);

631

}

632

if(dhparamsfilename == NULL){

633

if(mc->dh_bits == 0){

634

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

635

/* Try to read the private key file */

636

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

637

do {

638

int secfile = open(seckeyfilename, O_RDONLY);

639

if(secfile == -1){

640

perror_plus("open");

641

break;

642

}

643

size_t buffer_capacity = 0;

644

while(true){

645

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

646

(size_t)buffer.size,

647

(size_t)buffer_capacity);

648

if(buffer_capacity == 0){

649

perror_plus("incbuffer");

650

free(buffer.data);

651

buffer.data = NULL;

652

break;

653

}

654

ssize_t bytes_read = read(secfile,

655

buffer.data + buffer.size,

656

BUFFER_SIZE);

657

/* EOF */

658

if(bytes_read == 0){

659

break;

660

}

661

/* check bytes_read for failure */

662

if(bytes_read < 0){

663

perror_plus("read");

664

free(buffer.data);

665

buffer.data = NULL;

666

break;

667

}

668

buffer.size += (unsigned int)bytes_read;

669

}

670

close(secfile);

671

} while(false);

672

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

673

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

674

if(buffer.data != NULL){

675

{

676

gnutls_openpgp_privkey_t privkey = NULL;

677

ret = gnutls_openpgp_privkey_init(&privkey);

678

if(ret != GNUTLS_E_SUCCESS){

679

fprintf_plus(stderr, "Error initializing OpenPGP key"

680

" structure: %s",

681

safer_gnutls_strerror(ret));

682

free(buffer.data);

683

buffer.data = NULL;

684

} else {

685

ret = gnutls_openpgp_privkey_import

686

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

687

if(ret != GNUTLS_E_SUCCESS){

688

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

689

safer_gnutls_strerror(ret));

690

privkey = NULL;

691

}

692

free(buffer.data);

693

buffer.data = NULL;

694

if(privkey != NULL){

695

/* Use private key to suggest an appropriate

696

sec_param */

697

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

698

gnutls_openpgp_privkey_deinit(privkey);

699

if(debug){

700

fprintf_plus(stderr, "This OpenPGP key implies using"

701

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

702

safe_string(gnutls_sec_param_get_name

703

(sec_param)));

704

}

705

}

706

}

707

}

708

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

709

/* Err on the side of caution */

710

sec_param = GNUTLS_SEC_PARAM_ULTRA;

711

if(debug){

712

fprintf_plus(stderr, "Falling back to security parameter"

713

" \"%s\"\n",

714

safe_string(gnutls_sec_param_get_name

715

(sec_param)));

716

}

717

}

718

}

719

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

720

if(uret != 0){

721

mc->dh_bits = uret;

722

if(debug){

723

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

724

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

725

safe_string(gnutls_sec_param_get_name

726

(sec_param)),

727

mc->dh_bits);

728

}

729

} else {

730

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

731

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

732

safe_string(gnutls_sec_param_get_name

733

(sec_param)),

734

safer_gnutls_strerror(ret));

735

goto globalfail;

736

}

737

} else if(debug){

738

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

739

mc->dh_bits);

740

}

741

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

742

if(ret != GNUTLS_E_SUCCESS){

743

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

744

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

745

safer_gnutls_strerror(ret));

746

goto globalfail;

747

}

748

}

572

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

573

if(ret != GNUTLS_E_SUCCESS){

574

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

575

safer_gnutls_strerror(ret));

576

goto globalfail;

577

}

578

749

579

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

750

580

751

581

return 0;

753

583

globalfail:

754

584

755

585

gnutls_certificate_free_credentials(mc->cred);

586

gnutls_global_deinit();

756

587

gnutls_dh_params_deinit(mc->dh_params);

757

588

return -1;

758

589

}

810

641

/* ignore client certificate if any. */

811

642

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

812

643

644

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

645

813

646

return 0;

814

647

}

815

648

819

652

820

653

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

821

654

__attribute__((warn_unused_result))

822

int raise_privileges(void){

823

int old_errno = errno;

824

int ret = 0;

655

error_t raise_privileges(void){

656

error_t old_errno = errno;

657

error_t ret_errno = 0;

825

658

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

826

ret = errno;

659

ret_errno = errno;

827

660

}

828

661

errno = old_errno;

829

return ret;

662

return ret_errno;

830

663

}

831

664

832

665

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

833

666

__attribute__((warn_unused_result))

834

int raise_privileges_permanently(void){

835

int old_errno = errno;

836

int ret = raise_privileges();

837

if(ret != 0){

667

error_t raise_privileges_permanently(void){

668

error_t old_errno = errno;

669

error_t ret_errno = raise_privileges();

670

if(ret_errno != 0){

838

671

errno = old_errno;

839

return ret;

672

return ret_errno;

840

673

}

841

674

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

842

ret = errno;

675

ret_errno = errno;

843

676

}

844

677

errno = old_errno;

845

return ret;

678

return ret_errno;

846

679

}

847

680

848

681

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

849

682

__attribute__((warn_unused_result))

850

int lower_privileges(void){

851

int old_errno = errno;

852

int ret = 0;

683

error_t lower_privileges(void){

684

error_t old_errno = errno;

685

error_t ret_errno = 0;

853

686

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

854

ret = errno;

687

ret_errno = errno;

855

688

}

856

689

errno = old_errno;

857

return ret;

690

return ret_errno;

858

691

}

859

692

860

693

/* Lower privileges permanently */

861

694

__attribute__((warn_unused_result))

862

int lower_privileges_permanently(void){

863

int old_errno = errno;

864

int ret = 0;

695

error_t lower_privileges_permanently(void){

696

error_t old_errno = errno;

697

error_t ret_errno = 0;

865

698

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

866

ret = errno;

699

ret_errno = errno;

867

700

}

868

701

errno = old_errno;

869

return ret;

702

return ret_errno;

870

703

}

871

704

872

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

705

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

873

706

__attribute__((nonnull, warn_unused_result))

874

static bool add_delete_local_route(const bool add,

707

static bool add_remove_local_route(const bool add,

875

708

const char *address,

876

709

AvahiIfIndex if_index){

877

710

int ret;

878

711

char helper[] = "mandos-client-iprouteadddel";

879

712

char add_arg[] = "add";

880

713

char delete_arg[] = "delete";

881

char debug_flag[] = "--debug";

882

714

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

883

715

if(pluginhelperdir == NULL){

884

716

if(debug){

928

760

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

929

761

_exit(EX_OSERR);

930

762

}

931

ret = close(devnull);

763

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

932

764

if(ret == -1){

933

765

perror_plus("close");

934

766

_exit(EX_OSERR);

951

783

helper, O_RDONLY));

952

784

if(helper_fd == -1){

953

785

perror_plus("openat");

954

close(helperdir_fd);

955

786

_exit(EX_UNAVAILABLE);

956

787

}

957

close(helperdir_fd);

788

TEMP_FAILURE_RETRY(close(helperdir_fd));

958

789

#ifdef __GNUC__

959

790

#pragma GCC diagnostic push

960

791

#pragma GCC diagnostic ignored "-Wcast-qual"

961

792

#endif

962

793

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

963

794

{ helper, add ? add_arg : delete_arg, (char *)address,

964

interface, debug ? debug_flag : NULL, NULL },

965

environ) == -1){

795

interface, NULL }, environ) == -1){

966

796

#ifdef __GNUC__

967

797

#pragma GCC diagnostic pop

968

798

#endif

1020

850

__attribute__((nonnull, warn_unused_result))

1021

851

static bool add_local_route(const char *address,

1022

852

AvahiIfIndex if_index){

1023

if(debug){

1024

fprintf_plus(stderr, "Adding route to %s\n", address);

1025

}

1026

return add_delete_local_route(true, address, if_index);

853

return add_remove_local_route(true, address, if_index);

1027

854

}

1028

855

1029

856

__attribute__((nonnull, warn_unused_result))

1030

static bool delete_local_route(const char *address,

857

static bool remove_local_route(const char *address,

1031

858

AvahiIfIndex if_index){

1032

if(debug){

1033

fprintf_plus(stderr, "Removing route to %s\n", address);

1034

}

1035

return add_delete_local_route(false, address, if_index);

859

return add_remove_local_route(false, address, if_index);

1036

860

}

1037

861

1038

862

/* Called when a Mandos server is found */

1079

903

bool match = false;

1080

904

{

1081

905

char *interface = NULL;

1082

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

1083

mc->interfaces_size,

1084

interface))){

906

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

907

interface))){

1085

908

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

1086

909

match = true;

1087

910

break;

1129

952

goto mandos_end;

1130

953

}

1131

954

955

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

1132

956

if(af == AF_INET6){

1133

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

1134

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

1135

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

957

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

958

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

1136

959

} else { /* IPv4 */

1137

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

1138

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

1139

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

960

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

961

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

1140

962

}

1141

963

if(ret < 0 ){

1142

964

int e = errno;

1221

1043

sizeof(struct sockaddr_in));

1222

1044

}

1223

1045

if(ret < 0){

1224

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

1046

if(errno == ENETUNREACH

1225

1047

and if_index != AVAHI_IF_UNSPEC

1226

1048

and connect_to == NULL

1227

1049

and not route_added and

1240

1062

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

1241

1063

1242

1064

Avahi bug reference:

1243

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

1065

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

1244

1066

https://bugs.debian.org/587961

1245

1067

*/

1246

if(debug){

1247

fprintf_plus(stderr, "Mandos server unreachable, trying"

1248

" direct route\n");

1249

}

1250

1068

int e = errno;

1251

1069

route_added = add_local_route(ip, if_index);

1252

1070

if(route_added){

1426

1244

&decrypted_buffer, mc);

1427

1245

if(decrypted_buffer_size >= 0){

1428

1246

1429

clearerr(stdout);

1430

1247

written = 0;

1431

1248

while(written < (size_t) decrypted_buffer_size){

1432

1249

if(quit_now){

1448

1265

}

1449

1266

written += (size_t)ret;

1450

1267

}

1451

ret = fflush(stdout);

1452

if(ret != 0){

1453

int e = errno;

1454

if(debug){

1455

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

1456

strerror(errno));

1457

}

1458

errno = e;

1459

goto mandos_end;

1460

}

1461

1268

retval = 0;

1462

1269

}

1463

1270

}

1467

1274

mandos_end:

1468

1275

{

1469

1276

if(route_added){

1470

if(not delete_local_route(ip, if_index)){

1471

fprintf_plus(stderr, "Failed to delete local route to %s on"

1277

if(not remove_local_route(ip, if_index)){

1278

fprintf_plus(stderr, "Failed to remove local route to %s on"

1472

1279

" interface %d", ip, if_index);

1473

1280

}

1474

1281

}

1476

1283

free(decrypted_buffer);

1477

1284

free(buffer);

1478

1285

if(tcp_sd >= 0){

1479

ret = close(tcp_sd);

1286

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

1480

1287

}

1481

1288

if(ret == -1){

1482

1289

if(e == 0){

1637

1444

__attribute__((nonnull, warn_unused_result))

1638

1445

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

1639

1446

int ret;

1640

int old_errno;

1447

error_t ret_errno;

1641

1448

1642

1449

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

1643

1450

if(s < 0){

1644

old_errno = errno;

1451

ret_errno = errno;

1645

1452

perror_plus("socket");

1646

errno = old_errno;

1453

errno = ret_errno;

1647

1454

return false;

1648

1455

}

1649

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

1650

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

1456

strcpy(ifr->ifr_name, ifname);

1651

1457

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1652

1458

if(ret == -1){

1653

1459

if(debug){

1654

old_errno = errno;

1460

ret_errno = errno;

1655

1461

perror_plus("ioctl SIOCGIFFLAGS");

1656

errno = old_errno;

1462

errno = ret_errno;

1657

1463

}

1658

1464

return false;

1659

1465

}

1923

1729

return;

1924

1730

}

1925

1731

}

1732

#ifdef __GLIBC__

1733

#if __GLIBC_PREREQ(2, 15)

1926

1734

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

1927

1735

runnable_hook, alphasort);

1736

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

1737

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

1738

alphasort);

1739

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

1740

#else /* not __GLIBC__ */

1741

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

1742

alphasort);

1743

#endif /* not __GLIBC__ */

1928

1744

if(numhooks == -1){

1929

1745

perror_plus("scandir");

1930

1746

return;

2012

1828

perror_plus("openat");

2013

1829

_exit(EXIT_FAILURE);

2014

1830

}

2015

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

1831

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

2016

1832

perror_plus("close");

2017

1833

_exit(EXIT_FAILURE);

2018

1834

}

2021

1837

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

2022

1838

_exit(EX_OSERR);

2023

1839

}

2024

ret = close(devnull);

1840

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

2025

1841

if(ret == -1){

2026

1842

perror_plus("close");

2027

1843

_exit(EX_OSERR);

2076

1892

free(direntry);

2077

1893

}

2078

1894

free(direntries);

2079

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

1895

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

2080

1896

perror_plus("close");

2081

1897

} else {

2082

1898

hookdir_fd = -1;

2085

1901

}

2086

1902

2087

1903

__attribute__((nonnull, warn_unused_result))

2088

int bring_up_interface(const char *const interface,

2089

const float delay){

2090

int old_errno = errno;

1904

error_t bring_up_interface(const char *const interface,

1905

const float delay){

1906

error_t old_errno = errno;

2091

1907

int ret;

2092

1908

struct ifreq network;

2093

1909

unsigned int if_index = if_nametoindex(interface);

2103

1919

}

2104

1920

2105

1921

if(not interface_is_up(interface)){

2106

int ret_errno = 0;

2107

int ioctl_errno = 0;

1922

error_t ret_errno = 0, ioctl_errno = 0;

2108

1923

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

2109

1924

ret_errno = errno;

2110

1925

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

2123

1938

}

2124

1939

2125

1940

if(quit_now){

2126

ret = close(sd);

1941

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

2127

1942

if(ret == -1){

2128

1943

perror_plus("close");

2129

1944

}

2179

1994

}

2180

1995

2181

1996

/* Close the socket */

2182

ret = close(sd);

1997

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

2183

1998

if(ret == -1){

2184

1999

perror_plus("close");

2185

2000

}

2197

2012

2198

2013

/* Sleep checking until interface is running.

2199

2014

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

2200

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

2015

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

2201

2016

if(interface_is_running(interface)){

2202

2017

break;

2203

2018

}

2213

2028

}

2214

2029

2215

2030

__attribute__((nonnull, warn_unused_result))

2216

int take_down_interface(const char *const interface){

2217

int old_errno = errno;

2031

error_t take_down_interface(const char *const interface){

2032

error_t old_errno = errno;

2218

2033

struct ifreq network;

2219

2034

unsigned int if_index = if_nametoindex(interface);

2220

2035

if(if_index == 0){

2223

2038

return ENXIO;

2224

2039

}

2225

2040

if(interface_is_up(interface)){

2226

int ret_errno = 0;

2227

int ioctl_errno = 0;

2041

error_t ret_errno = 0, ioctl_errno = 0;

2228

2042

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

2229

2043

ret_errno = errno;

2230

2044

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

2268

2082

}

2269

2083

2270

2084

/* Close the socket */

2271

int ret = close(sd);

2085

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

2272

2086

if(ret == -1){

2273

2087

perror_plus("close");

2274

2088

}

2289

2103

}

2290

2104

2291

2105

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

2292

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

2293

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

2294

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

2295

.current_server = NULL, .interfaces = NULL,

2296

.interfaces_size = 0 };

2106

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

2107

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

2108

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

2109

.interfaces = NULL, .interfaces_size = 0 };

2297

2110

AvahiSServiceBrowser *sb = NULL;

2298

2111

error_t ret_errno;

2299

2112

int ret;

2308

2121

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2309

2122

const char *seckey = PATHDIR "/" SECKEY;

2310

2123

const char *pubkey = PATHDIR "/" PUBKEY;

2311

const char *dh_params_file = NULL;

2312

2124

char *interfaces_hooks = NULL;

2313

2125

2314

2126

bool gnutls_initialized = false;

2367

2179

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

2368

2180

" Diffie-Hellman key exchange",

2369

2181

.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 },

2375

2182

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

2376

2183

.arg = "STRING",

2377

2184

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

2432

2239

}

2433

2240

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

2434

2241

break;

2435

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

2436

dh_params_file = arg;

2437

break;

2438

2242

case 130: /* --priority */

2439

2243

mc.priority = arg;

2440

2244

break;

2480

2284

.args_doc = "",

2481

2285

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

2482

2286

" passwords from a Mandos server" };

2483

ret_errno = argp_parse(&argp, argc, argv,

2484

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2485

switch(ret_errno){

2287

ret = argp_parse(&argp, argc, argv,

2288

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2289

switch(ret){

2486

2290

case 0:

2487

2291

break;

2488

2292

case ENOMEM:

2489

2293

default:

2490

errno = ret_errno;

2294

errno = ret;

2491

2295

perror_plus("argp_parse");

2492

2296

exitcode = EX_OSERR;

2493

2297

goto end;

2499

2303

2500

2304

{

2501

2305

/* Work around Debian bug #633582:

2502

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

2306

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

2503

2307

2504

2308

/* Re-raise privileges */

2505

ret = raise_privileges();

2506

if(ret != 0){

2507

errno = ret;

2309

ret_errno = raise_privileges();

2310

if(ret_errno != 0){

2311

errno = ret_errno;

2508

2312

perror_plus("Failed to raise privileges");

2509

2313

} else {

2510

2314

struct stat st;

2526

2330

}

2527

2331

}

2528

2332

}

2529

close(seckey_fd);

2333

TEMP_FAILURE_RETRY(close(seckey_fd));

2530

2334

}

2531

2335

}

2532

2336

2547

2351

}

2548

2352

}

2549

2353

}

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);

2354

TEMP_FAILURE_RETRY(close(pubkey_fd));

2573

2355

}

2574

2356

}

2575

2357

2576

2358

/* Lower privileges */

2577

ret = lower_privileges();

2578

if(ret != 0){

2579

errno = ret;

2359

ret_errno = lower_privileges();

2360

if(ret_errno != 0){

2361

errno = ret_errno;

2580

2362

perror_plus("Failed to lower privileges");

2581

2363

}

2582

2364

}

2752

2534

errno = bring_up_interface(interface, delay);

2753

2535

if(not interface_was_up){

2754

2536

if(errno != 0){

2755

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

2756

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

2537

perror_plus("Failed to bring up interface");

2757

2538

} else {

2758

2539

errno = argz_add(&interfaces_to_take_down,

2759

2540

&interfaces_to_take_down_size,

2782

2563

goto end;

2783

2564

}

2784

2565

2785

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

2566

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

2786

2567

if(ret == -1){

2787

2568

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

2788

2569

exitcode = EX_UNAVAILABLE;

2910

2691

2911

2692

/* Allocate a new server */

2912

2693

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2913

&config, NULL, NULL, &ret);

2694

&config, NULL, NULL, &ret_errno);

2914

2695

2915

2696

/* Free the Avahi configuration data */

2916

2697

avahi_server_config_free(&config);

2919

2700

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

2920

2701

if(mc.server == NULL){

2921

2702

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

2922

avahi_strerror(ret));

2703

avahi_strerror(ret_errno));

2923

2704

exitcode = EX_UNAVAILABLE;

2924

2705

goto end;

2925

2706

}

2960

2741

end:

2961

2742

2962

2743

if(debug){

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

}

2744

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

2970

2745

}

2971

2746

2972

2747

/* Cleanup things */

2983

2758

2984

2759

if(gnutls_initialized){

2985

2760

gnutls_certificate_free_credentials(mc.cred);

2761

gnutls_global_deinit();

2986

2762

gnutls_dh_params_deinit(mc.dh_params);

2987

2763

}

2988

2764

3011

2787

3012

2788

/* Re-raise privileges */

3013

2789

{

3014

ret = raise_privileges();

3015

if(ret != 0){

3016

errno = ret;

2790

ret_errno = raise_privileges();

2791

if(ret_errno != 0){

2792

errno = ret_errno;

3017

2793

perror_plus("Failed to raise privileges");

3018

2794

} else {

3019

2795

3024

2800

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

3025

2801

{

3026

2802

char *interface = NULL;

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;

2803

while((interface=argz_next(interfaces_to_take_down,

2804

interfaces_to_take_down_size,

2805

interface))){

2806

ret_errno = take_down_interface(interface);

2807

if(ret_errno != 0){

2808

errno = ret_errno;

3033

2809

perror_plus("Failed to take down interface");

3034

2810

}

3035

2811

}

3040

2816

}

3041

2817

}

3042

2818

3043

ret = lower_privileges_permanently();

3044

if(ret != 0){

3045

errno = ret;

2819

ret_errno = lower_privileges_permanently();

2820

if(ret_errno != 0){

2821

errno = ret_errno;

3046

2822

perror_plus("Failed to lower privileges permanently");

3047

2823

}

3048

2824

}

3050

2826

free(interfaces_to_take_down);

3051

2827

free(interfaces_hooks);

3052

2828

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

3109

2829

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

3110

2830

if(tempdir != NULL){

3111

clean_dir_at(-1, tempdir, 0);

2831

struct dirent **direntries = NULL;

2832

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

2833

| O_NOFOLLOW

2834

| O_DIRECTORY

2835

| O_PATH));

2836

if(tempdir_fd == -1){

2837

perror_plus("open");

2838

} else {

2839

#ifdef __GLIBC__

2840

#if __GLIBC_PREREQ(2, 15)

2841

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

2842

notdotentries, alphasort);

2843

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

2844

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

2845

alphasort);

2846

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

2847

#else /* not __GLIBC__ */

2848

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

2849

alphasort);

2850

#endif /* not __GLIBC__ */

2851

if(numentries >= 0){

2852

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

2853

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

2854

if(ret == -1){

2855

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

2856

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

2857

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

2858

}

2859

free(direntries[i]);

2860

}

2861

2862

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

2863

free(direntries);

2864

if(numentries == -1){

2865

perror_plus("scandir");

2866

}

2867

ret = rmdir(tempdir);

2868

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

2869

perror_plus("rmdir");

2870

}

2871

}

2872

TEMP_FAILURE_RETRY(close(tempdir_fd));

2873

}

3112

2874

}

3113

2875

3114

2876

if(quit_now){