/mandos/release : revision 237.7.309

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

}

518

513

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

519

514

}

520

515

521

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

516

__attribute__((nonnull, warn_unused_result))

522

517

static int init_gnutls_global(const char *pubkeyfilename,

523

518

const char *seckeyfilename,

524

const char *dhparamsfilename,

525

519

mandos_context *mc){

526

520

int ret;

527

521

unsigned int uret;

530

524

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

531

525

}

532

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){

534

535

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

535

536

* - GnuTLS manual

543

544

if(ret != GNUTLS_E_SUCCESS){

544

545

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

545

546

safer_gnutls_strerror(ret));

547

gnutls_global_deinit();

546

548

return -1;

547

549

}

548

550

573

575

safer_gnutls_strerror(ret));

574

576

goto globalfail;

575

577

}

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;

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;

587

585

while(true){

588

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

589

(size_t)params.size,

590

(size_t)params_capacity);

591

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){

592

590

perror_plus("incbuffer");

593

free(params.data);

594

params.data = NULL;

595

dhparamsfilename = NULL;

591

free(buffer.data);

592

buffer.data = NULL;

596

593

break;

597

594

}

598

ssize_t bytes_read = read(dhpfile,

599

params.data + params.size,

595

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

600

596

BUFFER_SIZE);

601

597

/* EOF */

602

598

if(bytes_read == 0){

605

601

/* check bytes_read for failure */

606

602

if(bytes_read < 0){

607

603

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);

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);

678

627

if(ret != GNUTLS_E_SUCCESS){

679

fprintf_plus(stderr, "Error initializing OpenPGP key"

680

" structure: %s",

628

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

681

629

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

}

630

privkey = NULL;

706

631

}

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)));

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

}

716

644

}

717

645

}

718

646

}

719

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

720

if(uret != 0){

721

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;

722

650

if(debug){

723

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

724

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

651

fprintf_plus(stderr, "Falling back to security parameter"

652

" \"%s\"\n",

725

653

safe_string(gnutls_sec_param_get_name

726

(sec_param)),

727

mc->dh_bits);

654

(sec_param)));

728

655

}

729

} else {

730

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

731

" 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",

732

664

safe_string(gnutls_sec_param_get_name

733

665

(sec_param)),

734

safer_gnutls_strerror(ret));

735

goto globalfail;

666

mc->dh_bits);

736

667

}

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,

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)),

745

672

safer_gnutls_strerror(ret));

746

673

goto globalfail;

747

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

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

750

687

751

688

return 0;

753

690

globalfail:

754

691

755

692

gnutls_certificate_free_credentials(mc->cred);

693

gnutls_global_deinit();

756

694

gnutls_dh_params_deinit(mc->dh_params);

757

695

return -1;

758

696

}

810

748

/* ignore client certificate if any. */

811

749

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

812

750

751

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

752

813

753

return 0;

814

754

}

815

755

819

759

820

760

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

821

761

__attribute__((warn_unused_result))

822

int raise_privileges(void){

823

int old_errno = errno;

824

int ret = 0;

762

error_t raise_privileges(void){

763

error_t old_errno = errno;

764

error_t ret_errno = 0;

825

765

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

826

ret = errno;

766

ret_errno = errno;

827

767

}

828

768

errno = old_errno;

829

return ret;

769

return ret_errno;

830

770

}

831

771

832

772

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

833

773

__attribute__((warn_unused_result))

834

int raise_privileges_permanently(void){

835

int old_errno = errno;

836

int ret = raise_privileges();

837

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){

838

778

errno = old_errno;

839

return ret;

779

return ret_errno;

840

780

}

841

781

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

842

ret = errno;

782

ret_errno = errno;

843

783

}

844

784

errno = old_errno;

845

return ret;

785

return ret_errno;

846

786

}

847

787

848

788

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

849

789

__attribute__((warn_unused_result))

850

int lower_privileges(void){

851

int old_errno = errno;

852

int ret = 0;

790

error_t lower_privileges(void){

791

error_t old_errno = errno;

792

error_t ret_errno = 0;

853

793

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

854

ret = errno;

794

ret_errno = errno;

855

795

}

856

796

errno = old_errno;

857

return ret;

797

return ret_errno;

858

798

}

859

799

860

800

/* Lower privileges permanently */

861

801

__attribute__((warn_unused_result))

862

int lower_privileges_permanently(void){

863

int old_errno = errno;

864

int ret = 0;

802

error_t lower_privileges_permanently(void){

803

error_t old_errno = errno;

804

error_t ret_errno = 0;

865

805

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

866

ret = errno;

806

ret_errno = errno;

867

807

}

868

808

errno = old_errno;

869

return ret;

809

return ret_errno;

870

810

}

871

811

872

812

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

928

868

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

929

869

_exit(EX_OSERR);

930

870

}

931

ret = close(devnull);

871

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

932

872

if(ret == -1){

933

873

perror_plus("close");

934

874

_exit(EX_OSERR);

951

891

helper, O_RDONLY));

952

892

if(helper_fd == -1){

953

893

perror_plus("openat");

954

close(helperdir_fd);

955

894

_exit(EX_UNAVAILABLE);

956

895

}

957

close(helperdir_fd);

896

TEMP_FAILURE_RETRY(close(helperdir_fd));

958

897

#ifdef __GNUC__

959

898

#pragma GCC diagnostic push

960

899

#pragma GCC diagnostic ignored "-Wcast-qual"

1079

1018

bool match = false;

1080

1019

{

1081

1020

char *interface = NULL;

1082

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

1083

mc->interfaces_size,

1084

interface))){

1021

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

1022

interface))){

1085

1023

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

1086

1024

match = true;

1087

1025

break;

1129

1067

goto mandos_end;

1130

1068

}

1131

1069

1070

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

1132

1071

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);

1072

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

1073

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

1136

1074

} 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);

1075

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

1076

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

1140

1077

}

1141

1078

if(ret < 0 ){

1142

1079

int e = errno;

1221

1158

sizeof(struct sockaddr_in));

1222

1159

}

1223

1160

if(ret < 0){

1224

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

1161

if(errno == ENETUNREACH

1225

1162

and if_index != AVAHI_IF_UNSPEC

1226

1163

and connect_to == NULL

1227

1164

and not route_added and

1240

1177

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

1241

1178

1242

1179

Avahi bug reference:

1243

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

1180

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

1244

1181

https://bugs.debian.org/587961

1245

1182

*/

1246

1183

if(debug){

1426

1363

&decrypted_buffer, mc);

1427

1364

if(decrypted_buffer_size >= 0){

1428

1365

1429

clearerr(stdout);

1430

1366

written = 0;

1431

1367

while(written < (size_t) decrypted_buffer_size){

1432

1368

if(quit_now){

1448

1384

}

1449

1385

written += (size_t)ret;

1450

1386

}

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

1387

retval = 0;

1462

1388

}

1463

1389

}

1476

1402

free(decrypted_buffer);

1477

1403

free(buffer);

1478

1404

if(tcp_sd >= 0){

1479

ret = close(tcp_sd);

1405

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

1480

1406

}

1481

1407

if(ret == -1){

1482

1408

if(e == 0){

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

}

1851

#ifdef __GLIBC__

1852

#if __GLIBC_PREREQ(2, 15)

1926

1853

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

1927

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__ */

1928

1863

if(numhooks == -1){

1929

1864

perror_plus("scandir");

1930

1865

return;

2012

1947

perror_plus("openat");

2013

1948

_exit(EXIT_FAILURE);

2014

1949

}

2015

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

1950

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

2016

1951

perror_plus("close");

2017

1952

_exit(EXIT_FAILURE);

2018

1953

}

2021

1956

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

2022

1957

_exit(EX_OSERR);

2023

1958

}

2024

ret = close(devnull);

1959

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

2025

1960

if(ret == -1){

2026

1961

perror_plus("close");

2027

1962

_exit(EX_OSERR);

2076

2011

free(direntry);

2077

2012

}

2078

2013

free(direntries);

2079

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

2014

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

2080

2015

perror_plus("close");

2081

2016

} else {

2082

2017

hookdir_fd = -1;

2085

2020

}

2086

2021

2087

2022

__attribute__((nonnull, warn_unused_result))

2088

int bring_up_interface(const char *const interface,

2089

const float delay){

2090

int old_errno = errno;

2023

error_t bring_up_interface(const char *const interface,

2024

const float delay){

2025

error_t old_errno = errno;

2091

2026

int ret;

2092

2027

struct ifreq network;

2093

2028

unsigned int if_index = if_nametoindex(interface);

2103

2038

}

2104

2039

2105

2040

if(not interface_is_up(interface)){

2106

int ret_errno = 0;

2107

int ioctl_errno = 0;

2041

error_t ret_errno = 0, ioctl_errno = 0;

2108

2042

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

2109

2043

ret_errno = errno;

2110

2044

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

2123

2057

}

2124

2058

2125

2059

if(quit_now){

2126

ret = close(sd);

2060

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

2127

2061

if(ret == -1){

2128

2062

perror_plus("close");

2129

2063

}

2179

2113

}

2180

2114

2181

2115

/* Close the socket */

2182

ret = close(sd);

2116

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

2183

2117

if(ret == -1){

2184

2118

perror_plus("close");

2185

2119

}

2197

2131

2198

2132

/* Sleep checking until interface is running.

2199

2133

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

2200

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

2134

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

2201

2135

if(interface_is_running(interface)){

2202

2136

break;

2203

2137

}

2213

2147

}

2214

2148

2215

2149

__attribute__((nonnull, warn_unused_result))

2216

int take_down_interface(const char *const interface){

2217

int old_errno = errno;

2150

error_t take_down_interface(const char *const interface){

2151

error_t old_errno = errno;

2218

2152

struct ifreq network;

2219

2153

unsigned int if_index = if_nametoindex(interface);

2220

2154

if(if_index == 0){

2223

2157

return ENXIO;

2224

2158

}

2225

2159

if(interface_is_up(interface)){

2226

int ret_errno = 0;

2227

int ioctl_errno = 0;

2160

error_t ret_errno = 0, ioctl_errno = 0;

2228

2161

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

2229

2162

ret_errno = errno;

2230

2163

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

2268

2201

}

2269

2202

2270

2203

/* Close the socket */

2271

int ret = close(sd);

2204

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

2272

2205

if(ret == -1){

2273

2206

perror_plus("close");

2274

2207

}

2290

2223

2291

2224

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

2292

2225

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 };

2226

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

2227

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

2228

.interfaces = NULL, .interfaces_size = 0 };

2297

2229

AvahiSServiceBrowser *sb = NULL;

2298

2230

error_t ret_errno;

2299

2231

int ret;

2308

2240

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2309

2241

const char *seckey = PATHDIR "/" SECKEY;

2310

2242

const char *pubkey = PATHDIR "/" PUBKEY;

2311

const char *dh_params_file = NULL;

2312

2243

char *interfaces_hooks = NULL;

2313

2244

2314

2245

bool gnutls_initialized = false;

2367

2298

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

2368

2299

" Diffie-Hellman key exchange",

2369

2300

.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

2301

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

2376

2302

.arg = "STRING",

2377

2303

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

2432

2358

}

2433

2359

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

2434

2360

break;

2435

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

2436

dh_params_file = arg;

2437

break;

2438

2361

case 130: /* --priority */

2439

2362

mc.priority = arg;

2440

2363

break;

2480

2403

.args_doc = "",

2481

2404

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

2482

2405

" 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){

2406

ret = argp_parse(&argp, argc, argv,

2407

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2408

switch(ret){

2486

2409

case 0:

2487

2410

break;

2488

2411

case ENOMEM:

2489

2412

default:

2490

errno = ret_errno;

2413

errno = ret;

2491

2414

perror_plus("argp_parse");

2492

2415

exitcode = EX_OSERR;

2493

2416

goto end;

2499

2422

2500

2423

{

2501

2424

/* Work around Debian bug #633582:

2502

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

2425

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

2503

2426

2504

2427

/* Re-raise privileges */

2505

ret = raise_privileges();

2506

if(ret != 0){

2507

errno = ret;

2428

ret_errno = raise_privileges();

2429

if(ret_errno != 0){

2430

errno = ret_errno;

2508

2431

perror_plus("Failed to raise privileges");

2509

2432

} else {

2510

2433

struct stat st;

2526

2449

}

2527

2450

}

2528

2451

}

2529

close(seckey_fd);

2452

TEMP_FAILURE_RETRY(close(seckey_fd));

2530

2453

}

2531

2454

}

2532

2455

2547

2470

}

2548

2471

}

2549

2472

}

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);

2473

TEMP_FAILURE_RETRY(close(pubkey_fd));

2573

2474

}

2574

2475

}

2575

2476

2576

2477

/* Lower privileges */

2577

ret = lower_privileges();

2578

if(ret != 0){

2579

errno = ret;

2478

ret_errno = lower_privileges();

2479

if(ret_errno != 0){

2480

errno = ret_errno;

2580

2481

perror_plus("Failed to lower privileges");

2581

2482

}

2582

2483

}

2752

2653

errno = bring_up_interface(interface, delay);

2753

2654

if(not interface_was_up){

2754

2655

if(errno != 0){

2755

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

2756

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

2656

perror_plus("Failed to bring up interface");

2757

2657

} else {

2758

2658

errno = argz_add(&interfaces_to_take_down,

2759

2659

&interfaces_to_take_down_size,

2782

2682

goto end;

2783

2683

}

2784

2684

2785

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

2685

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

2786

2686

if(ret == -1){

2787

2687

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

2788

2688

exitcode = EX_UNAVAILABLE;

2910

2810

2911

2811

/* Allocate a new server */

2912

2812

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2913

&config, NULL, NULL, &ret);

2813

&config, NULL, NULL, &ret_errno);

2914

2814

2915

2815

/* Free the Avahi configuration data */

2916

2816

avahi_server_config_free(&config);

2919

2819

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

2920

2820

if(mc.server == NULL){

2921

2821

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

2922

avahi_strerror(ret));

2822

avahi_strerror(ret_errno));

2923

2823

exitcode = EX_UNAVAILABLE;

2924

2824

goto end;

2925

2825

}

2960

2860

end:

2961

2861

2962

2862

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

}

2863

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

2970

2864

}

2971

2865

2972

2866

/* Cleanup things */

2983

2877

2984

2878

if(gnutls_initialized){

2985

2879

gnutls_certificate_free_credentials(mc.cred);

2880

gnutls_global_deinit();

2986

2881

gnutls_dh_params_deinit(mc.dh_params);

2987

2882

}

2988

2883

3011

2906

3012

2907

/* Re-raise privileges */

3013

2908

{

3014

ret = raise_privileges();

3015

if(ret != 0){

3016

errno = ret;

2909

ret_errno = raise_privileges();

2910

if(ret_errno != 0){

2911

errno = ret_errno;

3017

2912

perror_plus("Failed to raise privileges");

3018

2913

} else {

3019

2914

3024

2919

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

3025

2920

{

3026

2921

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;

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;

3033

2928

perror_plus("Failed to take down interface");

3034

2929

}

3035

2930

}

3040

2935

}

3041

2936

}

3042

2937

3043

ret = lower_privileges_permanently();

3044

if(ret != 0){

3045

errno = ret;

2938

ret_errno = lower_privileges_permanently();

2939

if(ret_errno != 0){

2940

errno = ret_errno;

3046

2941

perror_plus("Failed to lower privileges permanently");

3047

2942

}

3048

2943

}

3050

2945

free(interfaces_to_take_down);

3051

2946

free(interfaces_hooks);

3052

2947

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

2948

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

3110

2949

if(tempdir != NULL){

3111

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

}

3112

2993

}

3113

2994

3114

2995

if(quit_now){