/mandos/trunk : revision 882

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> /* memset(), strcmp(), strlen(),

50

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

49

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

50

asprintf(), strncpy(), strsignal()

51

*/

51

52

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

52

53

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

53

54

sockaddr_in6, PF_INET6,

57

58

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

58

59

inet_pton(), connect(),

59

60

getnameinfo() */

60

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

61

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

61

62

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

62

63

*/

63

64

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

64

65

strtoimax() */

65

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

66

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

67

EAI_SYSTEM, ENETUNREACH,

68

EHOSTUNREACH, ECONNREFUSED, EPROTO,

69

EIO, ENOENT, ENXIO, ENOMEM, EISDIR,

70

ENOTEMPTY,

66

71

program_invocation_short_name */

67

72

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

68

73

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

305

310

return false;

306

311

}

307

312

308

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

313

ret = close(fd);

309

314

if(ret == -1){

310

315

perror_plus("close");

311

316

}

513

518

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

514

519

}

515

520

516

__attribute__((nonnull, warn_unused_result))

521

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

517

522

static int init_gnutls_global(const char *pubkeyfilename,

518

523

const char *seckeyfilename,

524

const char *dhparamsfilename,

519

525

mandos_context *mc){

520

526

int ret;

521

527

unsigned int uret;

524

530

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

525

531

}

526

532

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

533

if(debug){

535

534

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

536

535

* - GnuTLS manual

544

543

if(ret != GNUTLS_E_SUCCESS){

545

544

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

546

545

safer_gnutls_strerror(ret));

547

gnutls_global_deinit();

548

546

return -1;

549

547

}

550

548

575

573

safer_gnutls_strerror(ret));

576

574

goto globalfail;

577

575

}

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;

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;

585

587

while(true){

586

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

587

(size_t)buffer.size,

588

(size_t)buffer_capacity);

589

if(buffer_capacity == 0){

588

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

589

(size_t)params.size,

590

(size_t)params_capacity);

591

if(params_capacity == 0){

590

592

perror_plus("incbuffer");

591

free(buffer.data);

592

buffer.data = NULL;

593

free(params.data);

594

params.data = NULL;

595

dhparamsfilename = NULL;

593

596

break;

594

597

}

595

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

598

ssize_t bytes_read = read(dhpfile,

599

params.data + params.size,

596

600

BUFFER_SIZE);

597

601

/* EOF */

598

602

if(bytes_read == 0){

601

605

/* check bytes_read for failure */

602

606

if(bytes_read < 0){

603

607

perror_plus("read");

604

free(buffer.data);

605

buffer.data = NULL;

606

break;

607

}

608

buffer.size += (unsigned int)bytes_read;

609

}

610

close(secfile);

611

}

612

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

613

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

614

if(buffer.data != NULL){

615

{

616

gnutls_openpgp_privkey_t privkey = NULL;

617

ret = gnutls_openpgp_privkey_init(&privkey);

618

if(ret != GNUTLS_E_SUCCESS){

619

fprintf_plus(stderr, "Error initializing OpenPGP key"

620

" structure: %s", safer_gnutls_strerror(ret));

621

free(buffer.data);

622

buffer.data = NULL;

623

} else {

624

ret = gnutls_openpgp_privkey_import(privkey, &buffer,

625

GNUTLS_OPENPGP_FMT_BASE64,

626

"", 0);

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);

627

678

if(ret != GNUTLS_E_SUCCESS){

628

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

679

fprintf_plus(stderr, "Error initializing OpenPGP key"

680

" structure: %s",

629

681

safer_gnutls_strerror(ret));

630

privkey = NULL;

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

}

631

706

}

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

}

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)));

644

716

}

645

717

}

646

718

}

647

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

648

/* Err on the side of caution */

649

sec_param = GNUTLS_SEC_PARAM_ULTRA;

719

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

720

if(uret != 0){

721

mc->dh_bits = uret;

650

722

if(debug){

651

fprintf_plus(stderr, "Falling back to security parameter"

652

" \"%s\"\n",

723

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

724

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

653

725

safe_string(gnutls_sec_param_get_name

654

(sec_param)));

726

(sec_param)),

727

mc->dh_bits);

655

728

}

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",

729

} else {

730

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

731

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

664

732

safe_string(gnutls_sec_param_get_name

665

733

(sec_param)),

666

mc->dh_bits);

734

safer_gnutls_strerror(ret));

735

goto globalfail;

667

736

}

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)),

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,

672

745

safer_gnutls_strerror(ret));

673

746

goto globalfail;

674

747

}

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

748

}

686

749

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

687

750

688

751

return 0;

690

753

globalfail:

691

754

692

755

gnutls_certificate_free_credentials(mc->cred);

693

gnutls_global_deinit();

694

756

gnutls_dh_params_deinit(mc->dh_params);

695

757

return -1;

696

758

}

748

810

/* ignore client certificate if any. */

749

811

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

750

812

751

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

752

753

813

return 0;

754

814

}

755

815

759

819

760

820

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

761

821

__attribute__((warn_unused_result))

762

error_t raise_privileges(void){

763

error_t old_errno = errno;

764

error_t ret_errno = 0;

822

int raise_privileges(void){

823

int old_errno = errno;

824

int ret = 0;

765

825

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

766

ret_errno = errno;

826

ret = errno;

767

827

}

768

828

errno = old_errno;

769

return ret_errno;

829

return ret;

770

830

}

771

831

772

832

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

773

833

__attribute__((warn_unused_result))

774

error_t raise_privileges_permanently(void){

775

error_t old_errno = errno;

776

error_t ret_errno = raise_privileges();

777

if(ret_errno != 0){

834

int raise_privileges_permanently(void){

835

int old_errno = errno;

836

int ret = raise_privileges();

837

if(ret != 0){

778

838

errno = old_errno;

779

return ret_errno;

839

return ret;

780

840

}

781

841

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

782

ret_errno = errno;

842

ret = errno;

783

843

}

784

844

errno = old_errno;

785

return ret_errno;

845

return ret;

786

846

}

787

847

788

848

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

789

849

__attribute__((warn_unused_result))

790

error_t lower_privileges(void){

791

error_t old_errno = errno;

792

error_t ret_errno = 0;

850

int lower_privileges(void){

851

int old_errno = errno;

852

int ret = 0;

793

853

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

794

ret_errno = errno;

854

ret = errno;

795

855

}

796

856

errno = old_errno;

797

return ret_errno;

857

return ret;

798

858

}

799

859

800

860

/* Lower privileges permanently */

801

861

__attribute__((warn_unused_result))

802

error_t lower_privileges_permanently(void){

803

error_t old_errno = errno;

804

error_t ret_errno = 0;

862

int lower_privileges_permanently(void){

863

int old_errno = errno;

864

int ret = 0;

805

865

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

806

ret_errno = errno;

866

ret = errno;

807

867

}

808

868

errno = old_errno;

809

return ret_errno;

869

return ret;

810

870

}

811

871

812

872

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

868

928

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

869

929

_exit(EX_OSERR);

870

930

}

871

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

931

ret = close(devnull);

872

932

if(ret == -1){

873

933

perror_plus("close");

874

934

_exit(EX_OSERR);

891

951

helper, O_RDONLY));

892

952

if(helper_fd == -1){

893

953

perror_plus("openat");

954

close(helperdir_fd);

894

955

_exit(EX_UNAVAILABLE);

895

956

}

896

TEMP_FAILURE_RETRY(close(helperdir_fd));

957

close(helperdir_fd);

897

958

#ifdef __GNUC__

898

959

#pragma GCC diagnostic push

899

960

#pragma GCC diagnostic ignored "-Wcast-qual"

1067

1128

goto mandos_end;

1068

1129

}

1069

1130

1070

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

1071

1131

if(af == AF_INET6){

1072

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

1073

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

1132

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

1133

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

1134

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

1074

1135

} else { /* IPv4 */

1075

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

1076

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

1136

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

1137

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

1138

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

1077

1139

}

1078

1140

if(ret < 0 ){

1079

1141

int e = errno;

1158

1220

sizeof(struct sockaddr_in));

1159

1221

}

1160

1222

if(ret < 0){

1161

if(errno == ENETUNREACH

1223

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

1162

1224

and if_index != AVAHI_IF_UNSPEC

1163

1225

and connect_to == NULL

1164

1226

and not route_added and

1177

1239

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

1178

1240

1179

1241

Avahi bug reference:

1180

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

1242

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

1181

1243

https://bugs.debian.org/587961

1182

1244

*/

1183

1245

if(debug){

1363

1425

&decrypted_buffer, mc);

1364

1426

if(decrypted_buffer_size >= 0){

1365

1427

1428

clearerr(stdout);

1366

1429

written = 0;

1367

1430

while(written < (size_t) decrypted_buffer_size){

1368

1431

if(quit_now){

1384

1447

}

1385

1448

written += (size_t)ret;

1386

1449

}

1450

ret = fflush(stdout);

1451

if(ret != 0){

1452

int e = errno;

1453

if(debug){

1454

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

1455

strerror(errno));

1456

}

1457

errno = e;

1458

goto mandos_end;

1459

}

1387

1460

retval = 0;

1388

1461

}

1389

1462

}

1402

1475

free(decrypted_buffer);

1403

1476

free(buffer);

1404

1477

if(tcp_sd >= 0){

1405

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

1478

ret = close(tcp_sd);

1406

1479

}

1407

1480

if(ret == -1){

1408

1481

if(e == 0){

1563

1636

__attribute__((nonnull, warn_unused_result))

1564

1637

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

1565

1638

int ret;

1566

error_t ret_errno;

1639

int old_errno;

1567

1640

1568

1641

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

1569

1642

if(s < 0){

1570

ret_errno = errno;

1643

old_errno = errno;

1571

1644

perror_plus("socket");

1572

errno = ret_errno;

1645

errno = old_errno;

1573

1646

return false;

1574

1647

}

1575

strcpy(ifr->ifr_name, ifname);

1648

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

1649

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

1576

1650

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1577

1651

if(ret == -1){

1578

1652

if(debug){

1579

ret_errno = errno;

1653

old_errno = errno;

1580

1654

perror_plus("ioctl SIOCGIFFLAGS");

1581

errno = ret_errno;

1655

errno = old_errno;

1582

1656

}

1583

1657

return false;

1584

1658

}

1848

1922

return;

1849

1923

}

1850

1924

}

1851

#ifdef __GLIBC__

1852

#if __GLIBC_PREREQ(2, 15)

1853

1925

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

1854

1926

runnable_hook, alphasort);

1855

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

1856

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

1857

alphasort);

1858

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

1859

#else /* not __GLIBC__ */

1860

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

1861

alphasort);

1862

#endif /* not __GLIBC__ */

1863

1927

if(numhooks == -1){

1864

1928

perror_plus("scandir");

1865

1929

return;

1947

2011

perror_plus("openat");

1948

2012

_exit(EXIT_FAILURE);

1949

2013

}

1950

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

2014

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

1951

2015

perror_plus("close");

1952

2016

_exit(EXIT_FAILURE);

1953

2017

}

1956

2020

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

1957

2021

_exit(EX_OSERR);

1958

2022

}

1959

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

2023

ret = close(devnull);

1960

2024

if(ret == -1){

1961

2025

perror_plus("close");

1962

2026

_exit(EX_OSERR);

2011

2075

free(direntry);

2012

2076

}

2013

2077

free(direntries);

2014

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

2078

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

2015

2079

perror_plus("close");

2016

2080

} else {

2017

2081

hookdir_fd = -1;

2020

2084

}

2021

2085

2022

2086

__attribute__((nonnull, warn_unused_result))

2023

error_t bring_up_interface(const char *const interface,

2024

const float delay){

2025

error_t old_errno = errno;

2087

int bring_up_interface(const char *const interface,

2088

const float delay){

2089

int old_errno = errno;

2026

2090

int ret;

2027

2091

struct ifreq network;

2028

2092

unsigned int if_index = if_nametoindex(interface);

2038

2102

}

2039

2103

2040

2104

if(not interface_is_up(interface)){

2041

error_t ret_errno = 0, ioctl_errno = 0;

2105

int ret_errno = 0;

2106

int ioctl_errno = 0;

2042

2107

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

2043

2108

ret_errno = errno;

2044

2109

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

2057

2122

}

2058

2123

2059

2124

if(quit_now){

2060

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

2125

ret = close(sd);

2061

2126

if(ret == -1){

2062

2127

perror_plus("close");

2063

2128

}

2113

2178

}

2114

2179

2115

2180

/* Close the socket */

2116

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

2181

ret = close(sd);

2117

2182

if(ret == -1){

2118

2183

perror_plus("close");

2119

2184

}

2147

2212

}

2148

2213

2149

2214

__attribute__((nonnull, warn_unused_result))

2150

error_t take_down_interface(const char *const interface){

2151

error_t old_errno = errno;

2215

int take_down_interface(const char *const interface){

2216

int old_errno = errno;

2152

2217

struct ifreq network;

2153

2218

unsigned int if_index = if_nametoindex(interface);

2154

2219

if(if_index == 0){

2157

2222

return ENXIO;

2158

2223

}

2159

2224

if(interface_is_up(interface)){

2160

error_t ret_errno = 0, ioctl_errno = 0;

2225

int ret_errno = 0;

2226

int ioctl_errno = 0;

2161

2227

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

2162

2228

ret_errno = errno;

2163

2229

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

2201

2267

}

2202

2268

2203

2269

/* Close the socket */

2204

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

2270

int ret = close(sd);

2205

2271

if(ret == -1){

2206

2272

perror_plus("close");

2207

2273

}

2223

2289

2224

2290

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

2225

2291

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

2226

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

2227

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

2228

.interfaces = NULL, .interfaces_size = 0 };

2292

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

2293

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

2294

.current_server = NULL, .interfaces = NULL,

2295

.interfaces_size = 0 };

2229

2296

AvahiSServiceBrowser *sb = NULL;

2230

2297

error_t ret_errno;

2231

2298

int ret;

2240

2307

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2241

2308

const char *seckey = PATHDIR "/" SECKEY;

2242

2309

const char *pubkey = PATHDIR "/" PUBKEY;

2310

const char *dh_params_file = NULL;

2243

2311

char *interfaces_hooks = NULL;

2244

2312

2245

2313

bool gnutls_initialized = false;

2298

2366

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

2299

2367

" Diffie-Hellman key exchange",

2300

2368

.group = 2 },

2369

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

2370

.arg = "FILE",

2371

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

2372

" for the Diffie-Hellman key exchange",

2373

.group = 2 },

2301

2374

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

2302

2375

.arg = "STRING",

2303

2376

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

2358

2431

}

2359

2432

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

2360

2433

break;

2434

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

2435

dh_params_file = arg;

2436

break;

2361

2437

case 130: /* --priority */

2362

2438

mc.priority = arg;

2363

2439

break;

2403

2479

.args_doc = "",

2404

2480

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

2405

2481

" passwords from a Mandos server" };

2406

ret = argp_parse(&argp, argc, argv,

2407

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2408

switch(ret){

2482

ret_errno = argp_parse(&argp, argc, argv,

2483

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2484

switch(ret_errno){

2409

2485

case 0:

2410

2486

break;

2411

2487

case ENOMEM:

2412

2488

default:

2413

errno = ret;

2489

errno = ret_errno;

2414

2490

perror_plus("argp_parse");

2415

2491

exitcode = EX_OSERR;

2416

2492

goto end;

2422

2498

2423

2499

{

2424

2500

/* Work around Debian bug #633582:

2425

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

2501

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

2426

2502

2427

2503

/* Re-raise privileges */

2428

ret_errno = raise_privileges();

2429

if(ret_errno != 0){

2430

errno = ret_errno;

2504

ret = raise_privileges();

2505

if(ret != 0){

2506

errno = ret;

2431

2507

perror_plus("Failed to raise privileges");

2432

2508

} else {

2433

2509

struct stat st;

2449

2525

}

2450

2526

}

2451

2527

}

2452

TEMP_FAILURE_RETRY(close(seckey_fd));

2528

close(seckey_fd);

2453

2529

}

2454

2530

}

2455

2531

2470

2546

}

2471

2547

}

2472

2548

}

2473

TEMP_FAILURE_RETRY(close(pubkey_fd));

2549

close(pubkey_fd);

2550

}

2551

}

2552

2553

if(dh_params_file != NULL

2554

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

2555

int dhparams_fd = open(dh_params_file, O_RDONLY);

2556

if(dhparams_fd == -1){

2557

perror_plus("open");

2558

} else {

2559

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

2560

if(ret == -1){

2561

perror_plus("fstat");

2562

} else {

2563

if(S_ISREG(st.st_mode)

2564

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

2565

ret = fchown(dhparams_fd, uid, gid);

2566

if(ret == -1){

2567

perror_plus("fchown");

2568

}

2569

}

2570

}

2571

close(dhparams_fd);

2474

2572

}

2475

2573

}

2476

2574

2477

2575

/* Lower privileges */

2478

ret_errno = lower_privileges();

2479

if(ret_errno != 0){

2480

errno = ret_errno;

2576

ret = lower_privileges();

2577

if(ret != 0){

2578

errno = ret;

2481

2579

perror_plus("Failed to lower privileges");

2482

2580

}

2483

2581

}

2653

2751

errno = bring_up_interface(interface, delay);

2654

2752

if(not interface_was_up){

2655

2753

if(errno != 0){

2656

perror_plus("Failed to bring up interface");

2754

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

2755

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

2657

2756

} else {

2658

2757

errno = argz_add(&interfaces_to_take_down,

2659

2758

&interfaces_to_take_down_size,

2682

2781

goto end;

2683

2782

}

2684

2783

2685

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

2784

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

2686

2785

if(ret == -1){

2687

2786

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

2688

2787

exitcode = EX_UNAVAILABLE;

2810

2909

2811

2910

/* Allocate a new server */

2812

2911

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2813

&config, NULL, NULL, &ret_errno);

2912

&config, NULL, NULL, &ret);

2814

2913

2815

2914

/* Free the Avahi configuration data */

2816

2915

avahi_server_config_free(&config);

2819

2918

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

2820

2919

if(mc.server == NULL){

2821

2920

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

2822

avahi_strerror(ret_errno));

2921

avahi_strerror(ret));

2823

2922

exitcode = EX_UNAVAILABLE;

2824

2923

goto end;

2825

2924

}

2860

2959

end:

2861

2960

2862

2961

if(debug){

2863

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

2962

if(signal_received){

2963

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

2964

argv[0], signal_received,

2965

strsignal(signal_received));

2966

} else {

2967

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

2968

}

2864

2969

}

2865

2970

2866

2971

/* Cleanup things */

2877

2982

2878

2983

if(gnutls_initialized){

2879

2984

gnutls_certificate_free_credentials(mc.cred);

2880

gnutls_global_deinit();

2881

2985

gnutls_dh_params_deinit(mc.dh_params);

2882

2986

}

2883

2987

2906

3010

2907

3011

/* Re-raise privileges */

2908

3012

{

2909

ret_errno = raise_privileges();

2910

if(ret_errno != 0){

2911

errno = ret_errno;

3013

ret = raise_privileges();

3014

if(ret != 0){

3015

errno = ret;

2912

3016

perror_plus("Failed to raise privileges");

2913

3017

} else {

2914

3018

2922

3026

while((interface=argz_next(interfaces_to_take_down,

2923

3027

interfaces_to_take_down_size,

2924

3028

interface))){

2925

ret_errno = take_down_interface(interface);

2926

if(ret_errno != 0){

2927

errno = ret_errno;

3029

ret = take_down_interface(interface);

3030

if(ret != 0){

3031

errno = ret;

2928

3032

perror_plus("Failed to take down interface");

2929

3033

}

2930

3034

}

2935

3039

}

2936

3040

}

2937

3041

2938

ret_errno = lower_privileges_permanently();

2939

if(ret_errno != 0){

2940

errno = ret_errno;

3042

ret = lower_privileges_permanently();

3043

if(ret != 0){

3044

errno = ret;

2941

3045

perror_plus("Failed to lower privileges permanently");

2942

3046

}

2943

3047

}

2945

3049

free(interfaces_to_take_down);

2946

3050

free(interfaces_hooks);

2947

3051

3052

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

3053

uintmax_t level){

3054

struct dirent **direntries = NULL;

3055

int dret;

3056

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

3057

O_RDONLY

3058

| O_NOFOLLOW

3059

| O_DIRECTORY

3060

| O_PATH));

3061

if(dir_fd == -1){

3062

perror_plus("open");

3063

}

3064

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

3065

notdotentries, alphasort);

3066

if(numentries >= 0){

3067

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

3068

if(debug){

3069

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

3070

dirname, direntries[i]->d_name);

3071

}

3072

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

3073

if(dret == -1){

3074

if(errno == EISDIR){

3075

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

3076

AT_REMOVEDIR);

3077

}

3078

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

3079

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

3080

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

3081

/* Recurse only in this special case */

3082

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

3083

dret = 0;

3084

}

3085

if(dret == -1){

3086

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

3087

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

3088

}

3089

}

3090

free(direntries[i]);

3091

}

3092

3093

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

3094

free(direntries);

3095

if(numentries == -1){

3096

perror_plus("scandirat");

3097

}

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

2948

3108

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

2949

3109

if(tempdir != NULL){

2950

struct dirent **direntries = NULL;

2951

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

2952

| O_NOFOLLOW

2953

| O_DIRECTORY

2954

| O_PATH));

2955

if(tempdir_fd == -1){

2956

perror_plus("open");

2957

} else {

2958

#ifdef __GLIBC__

2959

#if __GLIBC_PREREQ(2, 15)

2960

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

2961

notdotentries, alphasort);

2962

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

2963

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

2964

alphasort);

2965

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

2966

#else /* not __GLIBC__ */

2967

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

2968

alphasort);

2969

#endif /* not __GLIBC__ */

2970

if(numentries >= 0){

2971

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

2972

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

2973

if(ret == -1){

2974

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

2975

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

2976

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

2977

}

2978

free(direntries[i]);

2979

}

2980

2981

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

2982

free(direntries);

2983

if(numentries == -1){

2984

perror_plus("scandir");

2985

}

2986

ret = rmdir(tempdir);

2987

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

2988

perror_plus("rmdir");

2989

}

2990

}

2991

TEMP_FAILURE_RETRY(close(tempdir_fd));

2992

}

3110

clean_dir_at(-1, tempdir, 0);

2993

3111

}

2994

3112

2995

3113

if(quit_now){