/mandos/release : revision 237.7.420

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

} while(false);

630

}

631

if(dhparamsfilename == NULL){

632

if(mc->dh_bits == 0){

633

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

634

/* Try to read the private key file */

635

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

636

do {

637

int secfile = open(seckeyfilename, O_RDONLY);

638

if(secfile == -1){

639

perror_plus("open");

640

break;

641

}

642

size_t buffer_capacity = 0;

643

while(true){

644

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

645

(size_t)buffer.size,

646

(size_t)buffer_capacity);

647

if(buffer_capacity == 0){

648

perror_plus("incbuffer");

649

free(buffer.data);

650

buffer.data = NULL;

651

break;

652

}

653

ssize_t bytes_read = read(secfile,

654

buffer.data + buffer.size,

655

BUFFER_SIZE);

656

/* EOF */

657

if(bytes_read == 0){

658

break;

659

}

660

/* check bytes_read for failure */

661

if(bytes_read < 0){

662

perror_plus("read");

663

free(buffer.data);

664

buffer.data = NULL;

665

break;

666

}

667

buffer.size += (unsigned int)bytes_read;

668

}

669

close(secfile);

670

} while(false);

671

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

672

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

673

if(buffer.data != NULL){

674

{

675

gnutls_openpgp_privkey_t privkey = NULL;

676

ret = gnutls_openpgp_privkey_init(&privkey);

627

677

if(ret != GNUTLS_E_SUCCESS){

628

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

678

fprintf_plus(stderr, "Error initializing OpenPGP key"

679

" structure: %s",

629

680

safer_gnutls_strerror(ret));

630

privkey = NULL;

681

free(buffer.data);

682

buffer.data = NULL;

683

} else {

684

ret = gnutls_openpgp_privkey_import

685

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

686

if(ret != GNUTLS_E_SUCCESS){

687

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

688

safer_gnutls_strerror(ret));

689

privkey = NULL;

690

}

691

free(buffer.data);

692

buffer.data = NULL;

693

if(privkey != NULL){

694

/* Use private key to suggest an appropriate

695

sec_param */

696

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

697

gnutls_openpgp_privkey_deinit(privkey);

698

if(debug){

699

fprintf_plus(stderr, "This OpenPGP key implies using"

700

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

701

safe_string(gnutls_sec_param_get_name

702

(sec_param)));

703

}

704

}

631

705

}

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

}

706

}

707

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

708

/* Err on the side of caution */

709

sec_param = GNUTLS_SEC_PARAM_ULTRA;

710

if(debug){

711

fprintf_plus(stderr, "Falling back to security parameter"

712

" \"%s\"\n",

713

safe_string(gnutls_sec_param_get_name

714

(sec_param)));

644

715

}

645

716

}

646

717

}

647

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

648

/* Err on the side of caution */

649

sec_param = GNUTLS_SEC_PARAM_ULTRA;

718

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

719

if(uret != 0){

720

mc->dh_bits = uret;

650

721

if(debug){

651

fprintf_plus(stderr, "Falling back to security parameter"

652

" \"%s\"\n",

722

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

723

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

653

724

safe_string(gnutls_sec_param_get_name

654

(sec_param)));

725

(sec_param)),

726

mc->dh_bits);

655

727

}

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",

728

} else {

729

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

730

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

664

731

safe_string(gnutls_sec_param_get_name

665

732

(sec_param)),

666

mc->dh_bits);

733

safer_gnutls_strerror(ret));

734

goto globalfail;

667

735

}

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)),

736

} else if(debug){

737

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

738

mc->dh_bits);

739

}

740

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

741

if(ret != GNUTLS_E_SUCCESS){

742

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

743

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

672

744

safer_gnutls_strerror(ret));

673

745

goto globalfail;

674

746

}

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

747

}

686

748

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

687

749

688

750

return 0;

690

752

globalfail:

691

753

692

754

gnutls_certificate_free_credentials(mc->cred);

693

gnutls_global_deinit();

694

755

gnutls_dh_params_deinit(mc->dh_params);

695

756

return -1;

696

757

}

748

809

/* ignore client certificate if any. */

749

810

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

750

811

751

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

752

753

812

return 0;

754

813

}

755

814

759

818

760

819

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

761

820

__attribute__((warn_unused_result))

762

error_t raise_privileges(void){

763

error_t old_errno = errno;

764

error_t ret_errno = 0;

821

int raise_privileges(void){

822

int old_errno = errno;

823

int ret = 0;

765

824

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

766

ret_errno = errno;

825

ret = errno;

767

826

}

768

827

errno = old_errno;

769

return ret_errno;

828

return ret;

770

829

}

771

830

772

831

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

773

832

__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){

833

int raise_privileges_permanently(void){

834

int old_errno = errno;

835

int ret = raise_privileges();

836

if(ret != 0){

778

837

errno = old_errno;

779

return ret_errno;

838

return ret;

780

839

}

781

840

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

782

ret_errno = errno;

841

ret = errno;

783

842

}

784

843

errno = old_errno;

785

return ret_errno;

844

return ret;

786

845

}

787

846

788

847

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

789

848

__attribute__((warn_unused_result))

790

error_t lower_privileges(void){

791

error_t old_errno = errno;

792

error_t ret_errno = 0;

849

int lower_privileges(void){

850

int old_errno = errno;

851

int ret = 0;

793

852

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

794

ret_errno = errno;

853

ret = errno;

795

854

}

796

855

errno = old_errno;

797

return ret_errno;

856

return ret;

798

857

}

799

858

800

859

/* Lower privileges permanently */

801

860

__attribute__((warn_unused_result))

802

error_t lower_privileges_permanently(void){

803

error_t old_errno = errno;

804

error_t ret_errno = 0;

861

int lower_privileges_permanently(void){

862

int old_errno = errno;

863

int ret = 0;

805

864

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

806

ret_errno = errno;

865

ret = errno;

807

866

}

808

867

errno = old_errno;

809

return ret_errno;

868

return ret;

810

869

}

811

870

812

871

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

868

927

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

869

928

_exit(EX_OSERR);

870

929

}

871

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

930

ret = close(devnull);

872

931

if(ret == -1){

873

932

perror_plus("close");

874

933

_exit(EX_OSERR);

891

950

helper, O_RDONLY));

892

951

if(helper_fd == -1){

893

952

perror_plus("openat");

953

close(helperdir_fd);

894

954

_exit(EX_UNAVAILABLE);

895

955

}

896

TEMP_FAILURE_RETRY(close(helperdir_fd));

956

close(helperdir_fd);

897

957

#ifdef __GNUC__

898

958

#pragma GCC diagnostic push

899

959

#pragma GCC diagnostic ignored "-Wcast-qual"

1067

1127

goto mandos_end;

1068

1128

}

1069

1129

1070

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

1071

1130

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);

1131

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

1132

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

1133

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

1074

1134

} 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);

1135

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

1136

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

1137

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

1077

1138

}

1078

1139

if(ret < 0 ){

1079

1140

int e = errno;

1158

1219

sizeof(struct sockaddr_in));

1159

1220

}

1160

1221

if(ret < 0){

1161

if(errno == ENETUNREACH

1222

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

1162

1223

and if_index != AVAHI_IF_UNSPEC

1163

1224

and connect_to == NULL

1164

1225

and not route_added and

1177

1238

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

1178

1239

1179

1240

Avahi bug reference:

1180

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

1241

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

1181

1242

https://bugs.debian.org/587961

1182

1243

*/

1183

1244

if(debug){

1363

1424

&decrypted_buffer, mc);

1364

1425

if(decrypted_buffer_size >= 0){

1365

1426

1427

clearerr(stdout);

1366

1428

written = 0;

1367

1429

while(written < (size_t) decrypted_buffer_size){

1368

1430

if(quit_now){

1384

1446

}

1385

1447

written += (size_t)ret;

1386

1448

}

1449

ret = fflush(stdout);

1450

if(ret != 0){

1451

int e = errno;

1452

if(debug){

1453

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

1454

strerror(errno));

1455

}

1456

errno = e;

1457

goto mandos_end;

1458

}

1387

1459

retval = 0;

1388

1460

}

1389

1461

}

1402

1474

free(decrypted_buffer);

1403

1475

free(buffer);

1404

1476

if(tcp_sd >= 0){

1405

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

1477

ret = close(tcp_sd);

1406

1478

}

1407

1479

if(ret == -1){

1408

1480

if(e == 0){

1563

1635

__attribute__((nonnull, warn_unused_result))

1564

1636

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

1565

1637

int ret;

1566

error_t ret_errno;

1638

int old_errno;

1567

1639

1568

1640

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

1569

1641

if(s < 0){

1570

ret_errno = errno;

1642

old_errno = errno;

1571

1643

perror_plus("socket");

1572

errno = ret_errno;

1644

errno = old_errno;

1573

1645

return false;

1574

1646

}

1575

strcpy(ifr->ifr_name, ifname);

1647

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

1648

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

1576

1649

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1577

1650

if(ret == -1){

1578

1651

if(debug){

1579

ret_errno = errno;

1652

old_errno = errno;

1580

1653

perror_plus("ioctl SIOCGIFFLAGS");

1581

errno = ret_errno;

1654

errno = old_errno;

1582

1655

}

1583

1656

return false;

1584

1657

}

1848

1921

return;

1849

1922

}

1850

1923

}

1851

#ifdef __GLIBC__

1852

#if __GLIBC_PREREQ(2, 15)

1853

1924

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

1854

1925

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

1926

if(numhooks == -1){

1864

1927

perror_plus("scandir");

1865

1928

return;

1947

2010

perror_plus("openat");

1948

2011

_exit(EXIT_FAILURE);

1949

2012

}

1950

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

2013

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

1951

2014

perror_plus("close");

1952

2015

_exit(EXIT_FAILURE);

1953

2016

}

1956

2019

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

1957

2020

_exit(EX_OSERR);

1958

2021

}

1959

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

2022

ret = close(devnull);

1960

2023

if(ret == -1){

1961

2024

perror_plus("close");

1962

2025

_exit(EX_OSERR);

2011

2074

free(direntry);

2012

2075

}

2013

2076

free(direntries);

2014

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

2077

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

2015

2078

perror_plus("close");

2016

2079

} else {

2017

2080

hookdir_fd = -1;

2020

2083

}

2021

2084

2022

2085

__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;

2086

int bring_up_interface(const char *const interface,

2087

const float delay){

2088

int old_errno = errno;

2026

2089

int ret;

2027

2090

struct ifreq network;

2028

2091

unsigned int if_index = if_nametoindex(interface);

2038

2101

}

2039

2102

2040

2103

if(not interface_is_up(interface)){

2041

error_t ret_errno = 0, ioctl_errno = 0;

2104

int ret_errno = 0;

2105

int ioctl_errno = 0;

2042

2106

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

2043

2107

ret_errno = errno;

2044

2108

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

2057

2121

}

2058

2122

2059

2123

if(quit_now){

2060

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

2124

ret = close(sd);

2061

2125

if(ret == -1){

2062

2126

perror_plus("close");

2063

2127

}

2113

2177

}

2114

2178

2115

2179

/* Close the socket */

2116

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

2180

ret = close(sd);

2117

2181

if(ret == -1){

2118

2182

perror_plus("close");

2119

2183

}

2147

2211

}

2148

2212

2149

2213

__attribute__((nonnull, warn_unused_result))

2150

error_t take_down_interface(const char *const interface){

2151

error_t old_errno = errno;

2214

int take_down_interface(const char *const interface){

2215

int old_errno = errno;

2152

2216

struct ifreq network;

2153

2217

unsigned int if_index = if_nametoindex(interface);

2154

2218

if(if_index == 0){

2157

2221

return ENXIO;

2158

2222

}

2159

2223

if(interface_is_up(interface)){

2160

error_t ret_errno = 0, ioctl_errno = 0;

2224

int ret_errno = 0;

2225

int ioctl_errno = 0;

2161

2226

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

2162

2227

ret_errno = errno;

2163

2228

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

2201

2266

}

2202

2267

2203

2268

/* Close the socket */

2204

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

2269

int ret = close(sd);

2205

2270

if(ret == -1){

2206

2271

perror_plus("close");

2207

2272

}

2223

2288

2224

2289

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

2225

2290

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 };

2291

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

2292

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

2293

.current_server = NULL, .interfaces = NULL,

2294

.interfaces_size = 0 };

2229

2295

AvahiSServiceBrowser *sb = NULL;

2230

2296

error_t ret_errno;

2231

2297

int ret;

2240

2306

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2241

2307

const char *seckey = PATHDIR "/" SECKEY;

2242

2308

const char *pubkey = PATHDIR "/" PUBKEY;

2309

const char *dh_params_file = NULL;

2243

2310

char *interfaces_hooks = NULL;

2244

2311

2245

2312

bool gnutls_initialized = false;

2298

2365

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

2299

2366

" Diffie-Hellman key exchange",

2300

2367

.group = 2 },

2368

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

2369

.arg = "FILE",

2370

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

2371

" for the Diffie-Hellman key exchange",

2372

.group = 2 },

2301

2373

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

2302

2374

.arg = "STRING",

2303

2375

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

2358

2430

}

2359

2431

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

2360

2432

break;

2433

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

2434

dh_params_file = arg;

2435

break;

2361

2436

case 130: /* --priority */

2362

2437

mc.priority = arg;

2363

2438

break;

2403

2478

.args_doc = "",

2404

2479

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

2405

2480

" passwords from a Mandos server" };

2406

ret = argp_parse(&argp, argc, argv,

2407

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2408

switch(ret){

2481

ret_errno = argp_parse(&argp, argc, argv,

2482

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2483

switch(ret_errno){

2409

2484

case 0:

2410

2485

break;

2411

2486

case ENOMEM:

2412

2487

default:

2413

errno = ret;

2488

errno = ret_errno;

2414

2489

perror_plus("argp_parse");

2415

2490

exitcode = EX_OSERR;

2416

2491

goto end;

2422

2497

2423

2498

{

2424

2499

/* Work around Debian bug #633582:

2425

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

2500

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

2426

2501

2427

2502

/* Re-raise privileges */

2428

ret_errno = raise_privileges();

2429

if(ret_errno != 0){

2430

errno = ret_errno;

2503

ret = raise_privileges();

2504

if(ret != 0){

2505

errno = ret;

2431

2506

perror_plus("Failed to raise privileges");

2432

2507

} else {

2433

2508

struct stat st;

2449

2524

}

2450

2525

}

2451

2526

}

2452

TEMP_FAILURE_RETRY(close(seckey_fd));

2527

close(seckey_fd);

2453

2528

}

2454

2529

}

2455

2530

2470

2545

}

2471

2546

}

2472

2547

}

2473

TEMP_FAILURE_RETRY(close(pubkey_fd));

2548

close(pubkey_fd);

2549

}

2550

}

2551

2552

if(dh_params_file != NULL

2553

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

2554

int dhparams_fd = open(dh_params_file, O_RDONLY);

2555

if(dhparams_fd == -1){

2556

perror_plus("open");

2557

} else {

2558

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

2559

if(ret == -1){

2560

perror_plus("fstat");

2561

} else {

2562

if(S_ISREG(st.st_mode)

2563

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

2564

ret = fchown(dhparams_fd, uid, gid);

2565

if(ret == -1){

2566

perror_plus("fchown");

2567

}

2568

}

2569

}

2570

close(dhparams_fd);

2474

2571

}

2475

2572

}

2476

2573

2477

2574

/* Lower privileges */

2478

ret_errno = lower_privileges();

2479

if(ret_errno != 0){

2480

errno = ret_errno;

2575

ret = lower_privileges();

2576

if(ret != 0){

2577

errno = ret;

2481

2578

perror_plus("Failed to lower privileges");

2482

2579

}

2483

2580

}

2653

2750

errno = bring_up_interface(interface, delay);

2654

2751

if(not interface_was_up){

2655

2752

if(errno != 0){

2656

perror_plus("Failed to bring up interface");

2753

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

2754

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

2657

2755

} else {

2658

2756

errno = argz_add(&interfaces_to_take_down,

2659

2757

&interfaces_to_take_down_size,

2682

2780

goto end;

2683

2781

}

2684

2782

2685

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

2783

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

2686

2784

if(ret == -1){

2687

2785

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

2688

2786

exitcode = EX_UNAVAILABLE;

2810

2908

2811

2909

/* Allocate a new server */

2812

2910

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2813

&config, NULL, NULL, &ret_errno);

2911

&config, NULL, NULL, &ret);

2814

2912

2815

2913

/* Free the Avahi configuration data */

2816

2914

avahi_server_config_free(&config);

2819

2917

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

2820

2918

if(mc.server == NULL){

2821

2919

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

2822

avahi_strerror(ret_errno));

2920

avahi_strerror(ret));

2823

2921

exitcode = EX_UNAVAILABLE;

2824

2922

goto end;

2825

2923

}

2860

2958

end:

2861

2959

2862

2960

if(debug){

2863

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

2961

if(signal_received){

2962

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

2963

argv[0], signal_received,

2964

strsignal(signal_received));

2965

} else {

2966

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

2967

}

2864

2968

}

2865

2969

2866

2970

/* Cleanup things */

2877

2981

2878

2982

if(gnutls_initialized){

2879

2983

gnutls_certificate_free_credentials(mc.cred);

2880

gnutls_global_deinit();

2881

2984

gnutls_dh_params_deinit(mc.dh_params);

2882

2985

}

2883

2986

2906

3009

2907

3010

/* Re-raise privileges */

2908

3011

{

2909

ret_errno = raise_privileges();

2910

if(ret_errno != 0){

2911

errno = ret_errno;

3012

ret = raise_privileges();

3013

if(ret != 0){

3014

errno = ret;

2912

3015

perror_plus("Failed to raise privileges");

2913

3016

} else {

2914

3017

2922

3025

while((interface=argz_next(interfaces_to_take_down,

2923

3026

interfaces_to_take_down_size,

2924

3027

interface))){

2925

ret_errno = take_down_interface(interface);

2926

if(ret_errno != 0){

2927

errno = ret_errno;

3028

ret = take_down_interface(interface);

3029

if(ret != 0){

3030

errno = ret;

2928

3031

perror_plus("Failed to take down interface");

2929

3032

}

2930

3033

}

2935

3038

}

2936

3039

}

2937

3040

2938

ret_errno = lower_privileges_permanently();

2939

if(ret_errno != 0){

2940

errno = ret_errno;

3041

ret = lower_privileges_permanently();

3042

if(ret != 0){

3043

errno = ret;

2941

3044

perror_plus("Failed to lower privileges permanently");

2942

3045

}

2943

3046

}

2945

3048

free(interfaces_to_take_down);

2946

3049

free(interfaces_hooks);

2947

3050

3051

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

3052

uintmax_t level){

3053

struct dirent **direntries = NULL;

3054

int dret;

3055

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

3056

O_RDONLY

3057

| O_NOFOLLOW

3058

| O_DIRECTORY

3059

| O_PATH));

3060

if(dir_fd == -1){

3061

perror_plus("open");

3062

}

3063

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

3064

notdotentries, alphasort);

3065

if(numentries >= 0){

3066

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

3067

if(debug){

3068

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

3069

dirname, direntries[i]->d_name);

3070

}

3071

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

3072

if(dret == -1){

3073

if(errno == EISDIR){

3074

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

3075

AT_REMOVEDIR);

3076

}

3077

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

3078

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

3079

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

3080

/* Recurse only in this special case */

3081

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

3082

dret = 0;

3083

}

3084

if(dret == -1){

3085

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

3086

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

3087

}

3088

}

3089

free(direntries[i]);

3090

}

3091

3092

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

3093

free(direntries);

3094

if(numentries == -1){

3095

perror_plus("scandirat");

3096

}

3097

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3098

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

3099

perror_plus("rmdir");

3100

}

3101

} else {

3102

perror_plus("scandirat");

3103

}

3104

close(dir_fd);

3105

}

3106

2948

3107

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

2949

3108

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

}

3109

clean_dir_at(-1, tempdir, 0);

2993

3110

}

2994

3111

2995

3112

if(quit_now){