/mandos/trunk : revision 678

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

32

/* Needed by GPGME, specifically gpgme_data_seek() */

33

#ifndef _LARGEFILE_SOURCE

34

#define _LARGEFILE_SOURCE

35

#endif /* not _LARGEFILE_SOURCE */

35

#endif

36

#ifndef _FILE_OFFSET_BITS

37

#define _FILE_OFFSET_BITS 64

38

#endif /* not _FILE_OFFSET_BITS */

38

#endif

39

40

#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */

41

42

#include <stdio.h> /* fprintf(), stderr, fwrite(),

43

stdout, ferror() */

43

stdout, ferror(), remove() */

44

#include <stdint.h> /* uint16_t, uint32_t, intptr_t */

45

#include <stddef.h> /* NULL, size_t, ssize_t */

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() */

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,

78

73

*/

79

74

#include <unistd.h> /* close(), SEEK_SET, off_t, write(),

80

75

getuid(), getgid(), seteuid(),

81

setgid(), pause(), _exit(),

82

unlinkat() */

76

setgid(), pause(), _exit() */

83

77

#include <arpa/inet.h> /* inet_pton(), htons() */

84

78

#include <iso646.h> /* not, or, and */

85

79

#include <argp.h> /* struct argp_option, error_t, struct

142

136

143

137

bool debug = false;

144

138

static const char mandos_protocol_version[] = "1";

145

const char *argp_program_version = "mandos-client " VERSION;

146

const char *argp_program_bug_address = "<mandos@recompile.se>";

139

const char * argp_program_version = "mandos-client " VERSION;

140

const char * argp_program_bug_address = "<mandos@recompile.se>";

147

141

static const char sys_class_net[] = "/sys/class/net";

148

142

char *connect_to = NULL;

149

143

const char *hookdir = HOOKDIR;

150

int hookdir_fd = -1;

151

144

uid_t uid = 65534;

152

145

gid_t gid = 65534;

153

146

239

232

.af = af };

240

233

if(new_server->ip == NULL){

241

234

perror_plus("strdup");

242

free(new_server);

243

235

return false;

244

236

}

245

237

ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));

246

238

if(ret == -1){

247

239

perror_plus("clock_gettime");

248

#ifdef __GNUC__

249

#pragma GCC diagnostic push

250

#pragma GCC diagnostic ignored "-Wcast-qual"

251

#endif

252

free((char *)(new_server->ip));

253

#ifdef __GNUC__

254

#pragma GCC diagnostic pop

255

#endif

256

free(new_server);

257

240

return false;

258

241

}

259

242

/* Special case of first server */

310

293

return false;

311

294

}

312

295

313

ret = close(fd);

296

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

314

297

if(ret == -1){

315

298

perror_plus("close");

316

299

}

498

481

return plaintext_length;

499

482

}

500

483

501

__attribute__((warn_unused_result, const))

502

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

503

if(str == NULL)

504

return "(unknown)";

505

return str;

506

}

507

508

484

__attribute__((warn_unused_result))

509

485

static const char *safer_gnutls_strerror(int value){

510

486

const char *ret = gnutls_strerror(value);

511

return safe_string(ret);

487

if(ret == NULL)

488

ret = "(unknown)";

489

return ret;

512

490

}

513

491

514

492

/* GnuTLS log function callback */

518

496

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

519

497

}

520

498

521

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

499

__attribute__((nonnull, warn_unused_result))

522

500

static int init_gnutls_global(const char *pubkeyfilename,

523

501

const char *seckeyfilename,

524

const char *dhparamsfilename,

525

502

mandos_context *mc){

526

503

int ret;

527

unsigned int uret;

528

504

529

505

if(debug){

530

506

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

531

507

}

532

508

509

ret = gnutls_global_init();

510

if(ret != GNUTLS_E_SUCCESS){

511

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

512

safer_gnutls_strerror(ret));

513

return -1;

514

}

515

533

516

if(debug){

534

517

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

535

518

* - GnuTLS manual

543

526

if(ret != GNUTLS_E_SUCCESS){

544

527

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

545

528

safer_gnutls_strerror(ret));

529

gnutls_global_deinit();

546

530

return -1;

547

531

}

548

532

573

557

safer_gnutls_strerror(ret));

574

558

goto globalfail;

575

559

}

576

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

577

if(dhparamsfilename != NULL){

578

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

579

do {

580

int dhpfile = open(dhparamsfilename, O_RDONLY);

581

if(dhpfile == -1){

582

perror_plus("open");

583

dhparamsfilename = NULL;

584

break;

585

}

586

size_t params_capacity = 0;

587

while(true){

588

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

589

(size_t)params.size,

590

(size_t)params_capacity);

591

if(params_capacity == 0){

592

perror_plus("incbuffer");

593

free(params.data);

594

params.data = NULL;

595

dhparamsfilename = NULL;

596

break;

597

}

598

ssize_t bytes_read = read(dhpfile,

599

params.data + params.size,

600

BUFFER_SIZE);

601

/* EOF */

602

if(bytes_read == 0){

603

break;

604

}

605

/* check bytes_read for failure */

606

if(bytes_read < 0){

607

perror_plus("read");

608

free(params.data);

609

params.data = NULL;

610

dhparamsfilename = NULL;

611

break;

612

}

613

params.size += (unsigned int)bytes_read;

614

}

615

if(params.data == NULL){

616

dhparamsfilename = NULL;

617

}

618

if(dhparamsfilename == NULL){

619

break;

620

}

621

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

622

GNUTLS_X509_FMT_PEM);

623

if(ret != GNUTLS_E_SUCCESS){

624

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

625

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

626

safer_gnutls_strerror(ret));

627

dhparamsfilename = NULL;

628

}

629

} 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);

677

if(ret != GNUTLS_E_SUCCESS){

678

fprintf_plus(stderr, "Error initializing OpenPGP key"

679

" structure: %s",

680

safer_gnutls_strerror(ret));

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

}

705

}

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)));

715

}

716

}

717

}

718

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

719

if(uret != 0){

720

mc->dh_bits = uret;

721

if(debug){

722

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

723

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

724

safe_string(gnutls_sec_param_get_name

725

(sec_param)),

726

mc->dh_bits);

727

}

728

} else {

729

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

730

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

731

safe_string(gnutls_sec_param_get_name

732

(sec_param)),

733

safer_gnutls_strerror(ret));

734

goto globalfail;

735

}

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,

744

safer_gnutls_strerror(ret));

745

goto globalfail;

746

}

747

}

560

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

561

if(ret != GNUTLS_E_SUCCESS){

562

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

563

safer_gnutls_strerror(ret));

564

goto globalfail;

565

}

566

748

567

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

749

568

750

569

return 0;

752

571

globalfail:

753

572

754

573

gnutls_certificate_free_credentials(mc->cred);

574

gnutls_global_deinit();

755

575

gnutls_dh_params_deinit(mc->dh_params);

756

576

return -1;

757

577

}

809

629

/* ignore client certificate if any. */

810

630

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

811

631

632

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

633

812

634

return 0;

813

635

}

814

636

816

638

static void empty_log(__attribute__((unused)) AvahiLogLevel level,

817

639

__attribute__((unused)) const char *txt){}

818

640

819

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

820

__attribute__((warn_unused_result))

821

int raise_privileges(void){

822

int old_errno = errno;

823

int ret = 0;

824

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

825

ret = errno;

826

}

827

errno = old_errno;

828

return ret;

829

}

830

831

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

832

__attribute__((warn_unused_result))

833

int raise_privileges_permanently(void){

834

int old_errno = errno;

835

int ret = raise_privileges();

836

if(ret != 0){

837

errno = old_errno;

838

return ret;

839

}

840

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

841

ret = errno;

842

}

843

errno = old_errno;

844

return ret;

845

}

846

847

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

848

__attribute__((warn_unused_result))

849

int lower_privileges(void){

850

int old_errno = errno;

851

int ret = 0;

852

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

853

ret = errno;

854

}

855

errno = old_errno;

856

return ret;

857

}

858

859

/* Lower privileges permanently */

860

__attribute__((warn_unused_result))

861

int lower_privileges_permanently(void){

862

int old_errno = errno;

863

int ret = 0;

864

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

865

ret = errno;

866

}

867

errno = old_errno;

868

return ret;

869

}

870

871

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

872

__attribute__((nonnull, warn_unused_result))

873

static bool add_delete_local_route(const bool add,

874

const char *address,

875

AvahiIfIndex if_index){

876

int ret;

877

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

878

char add_arg[] = "add";

879

char delete_arg[] = "delete";

880

char debug_flag[] = "--debug";

881

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

882

if(pluginhelperdir == NULL){

883

if(debug){

884

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

885

" variable not set; cannot run helper\n");

886

}

887

return false;

888

}

889

890

char interface[IF_NAMESIZE];

891

if(if_indextoname((unsigned int)if_index, interface) == NULL){

892

perror_plus("if_indextoname");

893

return false;

894

}

895

896

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

897

if(devnull == -1){

898

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

899

return false;

900

}

901

pid_t pid = fork();

902

if(pid == 0){

903

/* Child */

904

/* Raise privileges */

905

errno = raise_privileges_permanently();

906

if(errno != 0){

907

perror_plus("Failed to raise privileges");

908

/* _exit(EX_NOPERM); */

909

} else {

910

/* Set group */

911

errno = 0;

912

ret = setgid(0);

913

if(ret == -1){

914

perror_plus("setgid");

915

_exit(EX_NOPERM);

916

}

917

/* Reset supplementary groups */

918

errno = 0;

919

ret = setgroups(0, NULL);

920

if(ret == -1){

921

perror_plus("setgroups");

922

_exit(EX_NOPERM);

923

}

924

}

925

ret = dup2(devnull, STDIN_FILENO);

926

if(ret == -1){

927

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

928

_exit(EX_OSERR);

929

}

930

ret = close(devnull);

931

if(ret == -1){

932

perror_plus("close");

933

_exit(EX_OSERR);

934

}

935

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

936

if(ret == -1){

937

perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");

938

_exit(EX_OSERR);

939

}

940

int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,

941

O_RDONLY

942

| O_DIRECTORY

943

| O_PATH

944

| O_CLOEXEC));

945

if(helperdir_fd == -1){

946

perror_plus("open");

947

_exit(EX_UNAVAILABLE);

948

}

949

int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,

950

helper, O_RDONLY));

951

if(helper_fd == -1){

952

perror_plus("openat");

953

close(helperdir_fd);

954

_exit(EX_UNAVAILABLE);

955

}

956

close(helperdir_fd);

957

#ifdef __GNUC__

958

#pragma GCC diagnostic push

959

#pragma GCC diagnostic ignored "-Wcast-qual"

960

#endif

961

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

962

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

963

interface, debug ? debug_flag : NULL, NULL },

964

environ) == -1){

965

#ifdef __GNUC__

966

#pragma GCC diagnostic pop

967

#endif

968

perror_plus("fexecve");

969

_exit(EXIT_FAILURE);

970

}

971

}

972

if(pid == -1){

973

perror_plus("fork");

974

return false;

975

}

976

int status;

977

pid_t pret = -1;

978

errno = 0;

979

do {

980

pret = waitpid(pid, &status, 0);

981

if(pret == -1 and errno == EINTR and quit_now){

982

int errno_raising = 0;

983

if((errno = raise_privileges()) != 0){

984

errno_raising = errno;

985

perror_plus("Failed to raise privileges in order to"

986

" kill helper program");

987

}

988

if(kill(pid, SIGTERM) == -1){

989

perror_plus("kill");

990

}

991

if((errno_raising == 0) and (errno = lower_privileges()) != 0){

992

perror_plus("Failed to lower privileges after killing"

993

" helper program");

994

}

995

return false;

996

}

997

} while(pret == -1 and errno == EINTR);

998

if(pret == -1){

999

perror_plus("waitpid");

1000

return false;

1001

}

1002

if(WIFEXITED(status)){

1003

if(WEXITSTATUS(status) != 0){

1004

fprintf_plus(stderr, "Error: iprouteadddel exited"

1005

" with status %d\n", WEXITSTATUS(status));

1006

return false;

1007

}

1008

return true;

1009

}

1010

if(WIFSIGNALED(status)){

1011

fprintf_plus(stderr, "Error: iprouteadddel died by"

1012

" signal %d\n", WTERMSIG(status));

1013

return false;

1014

}

1015

fprintf_plus(stderr, "Error: iprouteadddel crashed\n");

1016

return false;

1017

}

1018

1019

__attribute__((nonnull, warn_unused_result))

1020

static bool add_local_route(const char *address,

1021

AvahiIfIndex if_index){

1022

if(debug){

1023

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

1024

}

1025

return add_delete_local_route(true, address, if_index);

1026

}

1027

1028

__attribute__((nonnull, warn_unused_result))

1029

static bool delete_local_route(const char *address,

1030

AvahiIfIndex if_index){

1031

if(debug){

1032

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

1033

}

1034

return add_delete_local_route(false, address, if_index);

1035

}

1036

1037

641

/* Called when a Mandos server is found */

1038

642

__attribute__((nonnull, warn_unused_result))

1039

643

static int start_mandos_communication(const char *ip, in_port_t port,

1050

654

int retval = -1;

1051

655

gnutls_session_t session;

1052

656

int pf; /* Protocol family */

1053

bool route_added = false;

1054

657

1055

658

errno = 0;

1056

659

1114

717

PRIuMAX "\n", ip, (uintmax_t)port);

1115

718

}

1116

719

1117

tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);

720

tcp_sd = socket(pf, SOCK_STREAM, 0);

1118

721

if(tcp_sd < 0){

1119

722

int e = errno;

1120

723

perror_plus("socket");

1127

730

goto mandos_end;

1128

731

}

1129

732

733

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

1130

734

if(af == AF_INET6){

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);

735

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

736

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

1134

737

} else { /* IPv4 */

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);

738

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

739

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

1138

740

}

1139

741

if(ret < 0 ){

1140

742

int e = errno;

1210

812

goto mandos_end;

1211

813

}

1212

814

1213

while(true){

1214

if(af == AF_INET6){

1215

ret = connect(tcp_sd, (struct sockaddr *)&to,

1216

sizeof(struct sockaddr_in6));

1217

} else {

1218

ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */

1219

sizeof(struct sockaddr_in));

1220

}

1221

if(ret < 0){

1222

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

1223

and if_index != AVAHI_IF_UNSPEC

1224

and connect_to == NULL

1225

and not route_added and

1226

((af == AF_INET6 and not

1227

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1228

&to)->sin6_addr)))

1229

or (af == AF_INET and

1230

/* Not a a IPv4LL address */

1231

(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)

1232

& 0xFFFF0000L) != 0xA9FE0000L))){

1233

/* Work around Avahi bug - Avahi does not announce link-local

1234

addresses if it has a global address, so local hosts with

1235

*only* a link-local address (e.g. Mandos clients) cannot

1236

connect to a Mandos server announced by Avahi on a server

1237

host with a global address. Work around this by retrying

1238

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

1239

1240

Avahi bug reference:

1241

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

1242

https://bugs.debian.org/587961

1243

*/

1244

if(debug){

1245

fprintf_plus(stderr, "Mandos server unreachable, trying"

1246

" direct route\n");

1247

}

1248

int e = errno;

1249

route_added = add_local_route(ip, if_index);

1250

if(route_added){

1251

continue;

1252

}

1253

errno = e;

1254

}

1255

if(errno != ECONNREFUSED or debug){

1256

int e = errno;

1257

perror_plus("connect");

1258

errno = e;

1259

}

1260

goto mandos_end;

1261

}

1262

1263

if(quit_now){

1264

errno = EINTR;

1265

goto mandos_end;

1266

}

1267

break;

815

if(af == AF_INET6){

816

ret = connect(tcp_sd, (struct sockaddr *)&to,

817

sizeof(struct sockaddr_in6));

818

} else {

819

ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */

820

sizeof(struct sockaddr_in));

821

}

822

if(ret < 0){

823

if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){

824

int e = errno;

825

perror_plus("connect");

826

errno = e;

827

}

828

goto mandos_end;

829

}

830

831

if(quit_now){

832

errno = EINTR;

833

goto mandos_end;

1268

834

}

1269

835

1270

836

const char *out = mandos_protocol_version;

1424

990

&decrypted_buffer, mc);

1425

991

if(decrypted_buffer_size >= 0){

1426

992

1427

clearerr(stdout);

1428

993

written = 0;

1429

994

while(written < (size_t) decrypted_buffer_size){

1430

995

if(quit_now){

1446

1011

}

1447

1012

written += (size_t)ret;

1448

1013

}

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

}

1459

1014

retval = 0;

1460

1015

}

1461

1016

}

1464

1019

1465

1020

mandos_end:

1466

1021

{

1467

if(route_added){

1468

if(not delete_local_route(ip, if_index)){

1469

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

1470

" interface %d", ip, if_index);

1471

}

1472

}

1473

1022

int e = errno;

1474

1023

free(decrypted_buffer);

1475

1024

free(buffer);

1476

1025

if(tcp_sd >= 0){

1477

ret = close(tcp_sd);

1026

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

1478

1027

}

1479

1028

if(ret == -1){

1480

1029

if(e == 0){

1515

1064

timed out */

1516

1065

1517

1066

if(quit_now){

1518

avahi_s_service_resolver_free(r);

1519

1067

return;

1520

1068

}

1521

1069

1635

1183

__attribute__((nonnull, warn_unused_result))

1636

1184

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

1637

1185

int ret;

1638

int old_errno;

1186

error_t ret_errno;

1639

1187

1640

1188

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

1641

1189

if(s < 0){

1642

old_errno = errno;

1190

ret_errno = errno;

1643

1191

perror_plus("socket");

1644

errno = old_errno;

1192

errno = ret_errno;

1645

1193

return false;

1646

1194

}

1647

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

1648

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

1195

strcpy(ifr->ifr_name, ifname);

1649

1196

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1650

1197

if(ret == -1){

1651

1198

if(debug){

1652

old_errno = errno;

1199

ret_errno = errno;

1653

1200

perror_plus("ioctl SIOCGIFFLAGS");

1654

errno = old_errno;

1201

errno = ret_errno;

1655

1202

}

1656

1203

return false;

1657

1204

}

1788

1335

sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"

1789

1336

"abcdefghijklmnopqrstuvwxyz"

1790

1337

"0123456789"

1791

"_.-");

1338

"_-");

1792

1339

if((direntry->d_name)[sret] != '\0'){

1793

1340

/* Contains non-allowed characters */

1794

1341

if(debug){

1798

1345

return 0;

1799

1346

}

1800

1347

1801

ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);

1348

char *fullname = NULL;

1349

ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);

1350

if(ret < 0){

1351

perror_plus("asprintf");

1352

return 0;

1353

}

1354

1355

ret = stat(fullname, &st);

1802

1356

if(ret == -1){

1803

1357

if(debug){

1804

1358

perror_plus("Could not stat hook");

1902

1456

}

1903

1457

}

1904

1458

1459

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

1460

__attribute__((warn_unused_result))

1461

error_t raise_privileges(void){

1462

error_t old_errno = errno;

1463

error_t ret_errno = 0;

1464

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

1465

ret_errno = errno;

1466

perror_plus("seteuid");

1467

}

1468

errno = old_errno;

1469

return ret_errno;

1470

}

1471

1472

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

1473

__attribute__((warn_unused_result))

1474

error_t raise_privileges_permanently(void){

1475

error_t old_errno = errno;

1476

error_t ret_errno = raise_privileges();

1477

if(ret_errno != 0){

1478

errno = old_errno;

1479

return ret_errno;

1480

}

1481

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

1482

ret_errno = errno;

1483

perror_plus("seteuid");

1484

}

1485

errno = old_errno;

1486

return ret_errno;

1487

}

1488

1489

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

1490

__attribute__((warn_unused_result))

1491

error_t lower_privileges(void){

1492

error_t old_errno = errno;

1493

error_t ret_errno = 0;

1494

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

1495

ret_errno = errno;

1496

perror_plus("seteuid");

1497

}

1498

errno = old_errno;

1499

return ret_errno;

1500

}

1501

1502

/* Lower privileges permanently */

1503

__attribute__((warn_unused_result))

1504

error_t lower_privileges_permanently(void){

1505

error_t old_errno = errno;

1506

error_t ret_errno = 0;

1507

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

1508

ret_errno = errno;

1509

perror_plus("setuid");

1510

}

1511

errno = old_errno;

1512

return ret_errno;

1513

}

1514

1905

1515

__attribute__((nonnull))

1906

1516

void run_network_hooks(const char *mode, const char *interface,

1907

1517

const float delay){

1908

struct dirent **direntries = NULL;

1909

if(hookdir_fd == -1){

1910

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1911

| O_CLOEXEC);

1912

if(hookdir_fd == -1){

1913

if(errno == ENOENT){

1914

if(debug){

1915

fprintf_plus(stderr, "Network hook directory \"%s\" not"

1916

" found\n", hookdir);

1917

}

1918

} else {

1919

perror_plus("open");

1920

}

1921

return;

1922

}

1923

}

1924

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

1925

runnable_hook, alphasort);

1518

struct dirent **direntries;

1519

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

1520

alphasort);

1926

1521

if(numhooks == -1){

1927

perror_plus("scandir");

1928

return;

1929

}

1930

struct dirent *direntry;

1931

int ret;

1932

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

1933

if(devnull == -1){

1934

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

1935

return;

1936

}

1937

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

1938

direntry = direntries[i];

1939

if(debug){

1940

fprintf_plus(stderr, "Running network hook \"%s\"\n",

1941

direntry->d_name);

1522

if(errno == ENOENT){

1523

if(debug){

1524

fprintf_plus(stderr, "Network hook directory \"%s\" not"

1525

" found\n", hookdir);

1526

}

1527

} else {

1528

perror_plus("scandir");

1942

1529

}

1943

pid_t hook_pid = fork();

1944

if(hook_pid == 0){

1945

/* Child */

1946

/* Raise privileges */

1947

errno = raise_privileges_permanently();

1948

if(errno != 0){

1949

perror_plus("Failed to raise privileges");

1950

_exit(EX_NOPERM);

1951

}

1952

/* Set group */

1953

errno = 0;

1954

ret = setgid(0);

1955

if(ret == -1){

1956

perror_plus("setgid");

1957

_exit(EX_NOPERM);

1958

}

1959

/* Reset supplementary groups */

1960

errno = 0;

1961

ret = setgroups(0, NULL);

1962

if(ret == -1){

1963

perror_plus("setgroups");

1964

_exit(EX_NOPERM);

1965

}

1966

ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);

1967

if(ret == -1){

1968

perror_plus("setenv");

1969

_exit(EX_OSERR);

1970

}

1971

ret = setenv("DEVICE", interface, 1);

1972

if(ret == -1){

1973

perror_plus("setenv");

1974

_exit(EX_OSERR);

1975

}

1976

ret = setenv("VERBOSITY", debug ? "1" : "0", 1);

1977

if(ret == -1){

1978

perror_plus("setenv");

1979

_exit(EX_OSERR);

1980

}

1981

ret = setenv("MODE", mode, 1);

1982

if(ret == -1){

1983

perror_plus("setenv");

1984

_exit(EX_OSERR);

1985

}

1986

char *delaystring;

1987

ret = asprintf(&delaystring, "%f", (double)delay);

1988

if(ret == -1){

1530

} else {

1531

struct dirent *direntry;

1532

int ret;

1533

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

1534

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

1535

direntry = direntries[i];

1536

char *fullname = NULL;

1537

ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);

1538

if(ret < 0){

1989

1539

perror_plus("asprintf");

1990

_exit(EX_OSERR);

1991

}

1992

ret = setenv("DELAY", delaystring, 1);

1993

if(ret == -1){

1540

continue;

1541

}

1542

if(debug){

1543

fprintf_plus(stderr, "Running network hook \"%s\"\n",

1544

direntry->d_name);

1545

}

1546

pid_t hook_pid = fork();

1547

if(hook_pid == 0){

1548

/* Child */

1549

/* Raise privileges */

1550

if(raise_privileges_permanently() != 0){

1551

perror_plus("Failed to raise privileges");

1552

_exit(EX_NOPERM);

1553

}

1554

/* Set group */

1555

errno = 0;

1556

ret = setgid(0);

1557

if(ret == -1){

1558

perror_plus("setgid");

1559

_exit(EX_NOPERM);

1560

}

1561

/* Reset supplementary groups */

1562

errno = 0;

1563

ret = setgroups(0, NULL);

1564

if(ret == -1){

1565

perror_plus("setgroups");

1566

_exit(EX_NOPERM);

1567

}

1568

ret = dup2(devnull, STDIN_FILENO);

1569

if(ret == -1){

1570

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

1571

_exit(EX_OSERR);

1572

}

1573

ret = close(devnull);

1574

if(ret == -1){

1575

perror_plus("close");

1576

_exit(EX_OSERR);

1577

}

1578

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1579

if(ret == -1){

1580

perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");

1581

_exit(EX_OSERR);

1582

}

1583

ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);

1584

if(ret == -1){

1585

perror_plus("setenv");

1586

_exit(EX_OSERR);

1587

}

1588

ret = setenv("DEVICE", interface, 1);

1589

if(ret == -1){

1590

perror_plus("setenv");

1591

_exit(EX_OSERR);

1592

}

1593

ret = setenv("VERBOSITY", debug ? "1" : "0", 1);

1594

if(ret == -1){

1595

perror_plus("setenv");

1596

_exit(EX_OSERR);

1597

}

1598

ret = setenv("MODE", mode, 1);

1599

if(ret == -1){

1600

perror_plus("setenv");

1601

_exit(EX_OSERR);

1602

}

1603

char *delaystring;

1604

ret = asprintf(&delaystring, "%f", (double)delay);

1605

if(ret == -1){

1606

perror_plus("asprintf");

1607

_exit(EX_OSERR);

1608

}

1609

ret = setenv("DELAY", delaystring, 1);

1610

if(ret == -1){

1611

free(delaystring);

1612

perror_plus("setenv");

1613

_exit(EX_OSERR);

1614

}

1994

1615

free(delaystring);

1995

perror_plus("setenv");

1996

_exit(EX_OSERR);

1997

}

1998

free(delaystring);

1999

if(connect_to != NULL){

2000

ret = setenv("CONNECT", connect_to, 1);

2001

if(ret == -1){

2002

perror_plus("setenv");

2003

_exit(EX_OSERR);

2004

}

2005

}

2006

int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,

2007

direntry->d_name,

2008

O_RDONLY));

2009

if(hook_fd == -1){

2010

perror_plus("openat");

2011

_exit(EXIT_FAILURE);

2012

}

2013

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

2014

perror_plus("close");

2015

_exit(EXIT_FAILURE);

2016

}

2017

ret = dup2(devnull, STDIN_FILENO);

2018

if(ret == -1){

2019

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

2020

_exit(EX_OSERR);

2021

}

2022

ret = close(devnull);

2023

if(ret == -1){

2024

perror_plus("close");

2025

_exit(EX_OSERR);

2026

}

2027

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2028

if(ret == -1){

2029

perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");

2030

_exit(EX_OSERR);

2031

}

2032

if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },

2033

environ) == -1){

2034

perror_plus("fexecve");

2035

_exit(EXIT_FAILURE);

2036

}

2037

} else {

2038

if(hook_pid == -1){

2039

perror_plus("fork");

2040

free(direntry);

2041

continue;

2042

}

2043

int status;

2044

if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){

2045

perror_plus("waitpid");

2046

free(direntry);

2047

continue;

2048

}

2049

if(WIFEXITED(status)){

2050

if(WEXITSTATUS(status) != 0){

2051

fprintf_plus(stderr, "Warning: network hook \"%s\" exited"

2052

" with status %d\n", direntry->d_name,

2053

WEXITSTATUS(status));

2054

free(direntry);

2055

continue;

2056

}

2057

} else if(WIFSIGNALED(status)){

2058

fprintf_plus(stderr, "Warning: network hook \"%s\" died by"

2059

" signal %d\n", direntry->d_name,

2060

WTERMSIG(status));

2061

free(direntry);

2062

continue;

1616

if(connect_to != NULL){

1617

ret = setenv("CONNECT", connect_to, 1);

1618

if(ret == -1){

1619

perror_plus("setenv");

1620

_exit(EX_OSERR);

1621

}

1622

}

1623

if(execl(fullname, direntry->d_name, mode, NULL) == -1){

1624

perror_plus("execl");

1625

_exit(EXIT_FAILURE);

1626

}

2063

1627

} else {

2064

fprintf_plus(stderr, "Warning: network hook \"%s\""

2065

" crashed\n", direntry->d_name);

2066

free(direntry);

2067

continue;

2068

}

2069

}

2070

if(debug){

2071

fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",

2072

direntry->d_name);

2073

}

2074

free(direntry);

2075

}

2076

free(direntries);

2077

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

2078

perror_plus("close");

2079

} else {

2080

hookdir_fd = -1;

2081

}

2082

close(devnull);

1628

int status;

1629

if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){

1630

perror_plus("waitpid");

1631

free(fullname);

1632

continue;

1633

}

1634

if(WIFEXITED(status)){

1635

if(WEXITSTATUS(status) != 0){

1636

fprintf_plus(stderr, "Warning: network hook \"%s\" exited"

1637

" with status %d\n", direntry->d_name,

1638

WEXITSTATUS(status));

1639

free(fullname);

1640

continue;

1641

}

1642

} else if(WIFSIGNALED(status)){

1643

fprintf_plus(stderr, "Warning: network hook \"%s\" died by"

1644

" signal %d\n", direntry->d_name,

1645

WTERMSIG(status));

1646

free(fullname);

1647

continue;

1648

} else {

1649

fprintf_plus(stderr, "Warning: network hook \"%s\""

1650

" crashed\n", direntry->d_name);

1651

free(fullname);

1652

continue;

1653

}

1654

}

1655

free(fullname);

1656

if(debug){

1657

fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",

1658

direntry->d_name);

1659

}

1660

}

1661

close(devnull);

1662

}

2083

1663

}

2084

1664

2085

1665

__attribute__((nonnull, warn_unused_result))

2086

int bring_up_interface(const char *const interface,

2087

const float delay){

2088

int old_errno = errno;

1666

error_t bring_up_interface(const char *const interface,

1667

const float delay){

1668

error_t old_errno = errno;

2089

1669

int ret;

2090

1670

struct ifreq network;

2091

1671

unsigned int if_index = if_nametoindex(interface);

2101

1681

}

2102

1682

2103

1683

if(not interface_is_up(interface)){

2104

int ret_errno = 0;

2105

int ioctl_errno = 0;

1684

error_t ret_errno = 0, ioctl_errno = 0;

2106

1685

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

2107

1686

ret_errno = errno;

2108

1687

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

2121

1700

}

2122

1701

2123

1702

if(quit_now){

2124

ret = close(sd);

1703

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

2125

1704

if(ret == -1){

2126

1705

perror_plus("close");

2127

1706

}

2136

1715

2137

1716

/* Raise privileges */

2138

1717

ret_errno = raise_privileges();

1718

bool restore_loglevel = false;

2139

1719

if(ret_errno != 0){

2140

errno = ret_errno;

2141

1720

perror_plus("Failed to raise privileges");

2142

1721

}

2143

2144

1722

#ifdef __linux__

2145

1723

int ret_linux;

2146

bool restore_loglevel = false;

2147

1724

if(ret_errno == 0){

2148

1725

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2149

1726

messages about the network interface to mess up the prompt */

2177

1754

}

2178

1755

2179

1756

/* Close the socket */

2180

ret = close(sd);

1757

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

2181

1758

if(ret == -1){

2182

1759

perror_plus("close");

2183

1760

}

2211

1788

}

2212

1789

2213

1790

__attribute__((nonnull, warn_unused_result))

2214

int take_down_interface(const char *const interface){

2215

int old_errno = errno;

1791

error_t take_down_interface(const char *const interface){

1792

error_t old_errno = errno;

2216

1793

struct ifreq network;

2217

1794

unsigned int if_index = if_nametoindex(interface);

2218

1795

if(if_index == 0){

2221

1798

return ENXIO;

2222

1799

}

2223

1800

if(interface_is_up(interface)){

2224

int ret_errno = 0;

2225

int ioctl_errno = 0;

1801

error_t ret_errno = 0, ioctl_errno = 0;

2226

1802

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

2227

1803

ret_errno = errno;

2228

1804

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

2248

1824

/* Raise privileges */

2249

1825

ret_errno = raise_privileges();

2250

1826

if(ret_errno != 0){

2251

errno = ret_errno;

2252

1827

perror_plus("Failed to raise privileges");

2253

1828

}

2254

2255

1829

int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);

2256

1830

ioctl_errno = errno;

2257

1831

2266

1840

}

2267

1841

2268

1842

/* Close the socket */

2269

int ret = close(sd);

1843

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

2270

1844

if(ret == -1){

2271

1845

perror_plus("close");

2272

1846

}

2287

1861

}

2288

1862

2289

1863

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

2290

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

2291

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

2292

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

2293

.current_server = NULL, .interfaces = NULL,

2294

.interfaces_size = 0 };

1864

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

1865

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

1866

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

1867

.interfaces = NULL, .interfaces_size = 0 };

2295

1868

AvahiSServiceBrowser *sb = NULL;

2296

1869

error_t ret_errno;

2297

1870

int ret;

2306

1879

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2307

1880

const char *seckey = PATHDIR "/" SECKEY;

2308

1881

const char *pubkey = PATHDIR "/" PUBKEY;

2309

const char *dh_params_file = NULL;

2310

1882

char *interfaces_hooks = NULL;

2311

1883

2312

1884

bool gnutls_initialized = false;

2365

1937

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

2366

1938

" Diffie-Hellman key exchange",

2367

1939

.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 },

2373

1940

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

2374

1941

.arg = "STRING",

2375

1942

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

2430

1997

}

2431

1998

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

2432

1999

break;

2433

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

2434

dh_params_file = arg;

2435

break;

2436

2000

case 130: /* --priority */

2437

2001

mc.priority = arg;

2438

2002

break;

2478

2042

.args_doc = "",

2479

2043

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

2480

2044

" passwords from a Mandos server" };

2481

ret_errno = argp_parse(&argp, argc, argv,

2482

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2483

switch(ret_errno){

2045

ret = argp_parse(&argp, argc, argv,

2046

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2047

switch(ret){

2484

2048

case 0:

2485

2049

break;

2486

2050

case ENOMEM:

2487

2051

default:

2488

errno = ret_errno;

2052

errno = ret;

2489

2053

perror_plus("argp_parse");

2490

2054

exitcode = EX_OSERR;

2491

2055

goto end;

2494

2058

goto end;

2495

2059

}

2496

2060

}

2497

2061

2498

2062

{

2499

2063

/* Work around Debian bug #633582:

2500

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

2064

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

2501

2065

2502

2066

/* Re-raise privileges */

2503

ret = raise_privileges();

2504

if(ret != 0){

2505

errno = ret;

2067

ret_errno = raise_privileges();

2068

if(ret_errno != 0){

2069

errno = ret_errno;

2506

2070

perror_plus("Failed to raise privileges");

2507

2071

} else {

2508

2072

struct stat st;

2524

2088

}

2525

2089

}

2526

2090

}

2527

close(seckey_fd);

2091

TEMP_FAILURE_RETRY(close(seckey_fd));

2528

2092

}

2529

2093

}

2530

2094

2531

2095

if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){

2532

2096

int pubkey_fd = open(pubkey, O_RDONLY);

2533

2097

if(pubkey_fd == -1){

2545

2109

}

2546

2110

}

2547

2111

}

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);

2571

}

2572

}

2573

2112

TEMP_FAILURE_RETRY(close(pubkey_fd));

2113

}

2114

}

2115

2574

2116

/* Lower privileges */

2575

ret = lower_privileges();

2576

if(ret != 0){

2577

errno = ret;

2117

ret_errno = lower_privileges();

2118

if(ret_errno != 0){

2119

errno = ret_errno;

2578

2120

perror_plus("Failed to lower privileges");

2579

2121

}

2580

2122

}

2693

2235

2694

2236

/* If no interfaces were specified, make a list */

2695

2237

if(mc.interfaces == NULL){

2696

struct dirent **direntries = NULL;

2238

struct dirent **direntries;

2697

2239

/* Look for any good interfaces */

2698

2240

ret = scandir(sys_class_net, &direntries, good_interface,

2699

2241

alphasort);

2705

2247

if(ret_errno != 0){

2706

2248

errno = ret_errno;

2707

2249

perror_plus("argz_add");

2708

free(direntries[i]);

2709

2250

continue;

2710

2251

}

2711

2252

if(debug){

2712

2253

fprintf_plus(stderr, "Will use interface \"%s\"\n",

2713

2254

direntries[i]->d_name);

2714

2255

}

2715

free(direntries[i]);

2716

2256

}

2717

2257

free(direntries);

2718

2258

} else {

2719

if(ret == 0){

2720

free(direntries);

2721

}

2259

free(direntries);

2722

2260

fprintf_plus(stderr, "Could not find a network interface\n");

2723

2261

exitcode = EXIT_FAILURE;

2724

2262

goto end;

2750

2288

errno = bring_up_interface(interface, delay);

2751

2289

if(not interface_was_up){

2752

2290

if(errno != 0){

2753

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

2754

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

2291

perror_plus("Failed to bring up interface");

2755

2292

} else {

2756

2293

errno = argz_add(&interfaces_to_take_down,

2757

2294

&interfaces_to_take_down_size,

2780

2317

goto end;

2781

2318

}

2782

2319

2783

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

2320

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

2784

2321

if(ret == -1){

2785

2322

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

2786

2323

exitcode = EX_UNAVAILABLE;

2908

2445

2909

2446

/* Allocate a new server */

2910

2447

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2911

&config, NULL, NULL, &ret);

2448

&config, NULL, NULL, &ret_errno);

2912

2449

2913

2450

/* Free the Avahi configuration data */

2914

2451

avahi_server_config_free(&config);

2917

2454

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

2918

2455

if(mc.server == NULL){

2919

2456

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

2920

avahi_strerror(ret));

2457

avahi_strerror(ret_errno));

2921

2458

exitcode = EX_UNAVAILABLE;

2922

2459

goto end;

2923

2460

}

2947

2484

if(debug){

2948

2485

fprintf_plus(stderr, "Starting Avahi loop search\n");

2949

2486

}

2950

2487

2951

2488

ret = avahi_loop_with_timeout(simple_poll,

2952

2489

(int)(retry_interval * 1000), &mc);

2953

2490

if(debug){

2958

2495

end:

2959

2496

2960

2497

if(debug){

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

}

2498

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

2968

2499

}

2969

2500

2970

2501

/* Cleanup things */

2981

2512

2982

2513

if(gnutls_initialized){

2983

2514

gnutls_certificate_free_credentials(mc.cred);

2515

gnutls_global_deinit();

2984

2516

gnutls_dh_params_deinit(mc.dh_params);

2985

2517

}

2986

2518

2994

2526

mc.current_server->prev->next = NULL;

2995

2527

while(mc.current_server != NULL){

2996

2528

server *next = mc.current_server->next;

2997

#ifdef __GNUC__

2998

#pragma GCC diagnostic push

2999

#pragma GCC diagnostic ignored "-Wcast-qual"

3000

#endif

3001

free((char *)(mc.current_server->ip));

3002

#ifdef __GNUC__

3003

#pragma GCC diagnostic pop

3004

#endif

3005

2529

free(mc.current_server);

3006

2530

mc.current_server = next;

3007

2531

}

3009

2533

3010

2534

/* Re-raise privileges */

3011

2535

{

3012

ret = raise_privileges();

3013

if(ret != 0){

3014

errno = ret;

2536

ret_errno = raise_privileges();

2537

if(ret_errno != 0){

3015

2538

perror_plus("Failed to raise privileges");

3016

2539

} else {

3017

2540

3025

2548

while((interface=argz_next(interfaces_to_take_down,

3026

2549

interfaces_to_take_down_size,

3027

2550

interface))){

3028

ret = take_down_interface(interface);

3029

if(ret != 0){

3030

errno = ret;

2551

ret_errno = take_down_interface(interface);

2552

if(ret_errno != 0){

2553

errno = ret_errno;

3031

2554

perror_plus("Failed to take down interface");

3032

2555

}

3033

2556

}

3037

2560

}

3038

2561

}

3039

2562

}

3040

3041

ret = lower_privileges_permanently();

3042

if(ret != 0){

3043

errno = ret;

2563

ret_errno = lower_privileges_permanently();

2564

if(ret_errno != 0){

3044

2565

perror_plus("Failed to lower privileges permanently");

3045

2566

}

3046

2567

}

3048

2569

free(interfaces_to_take_down);

3049

2570

free(interfaces_hooks);

3050

2571

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

3107

2572

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

3108

2573

if(tempdir != NULL){

3109

clean_dir_at(-1, tempdir, 0);

2574

struct dirent **direntries = NULL;

2575

struct dirent *direntry = NULL;

2576

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

2577

alphasort);

2578

if(numentries > 0){

2579

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

2580

direntry = direntries[i];

2581

char *fullname = NULL;

2582

ret = asprintf(&fullname, "%s/%s", tempdir,

2583

direntry->d_name);

2584

if(ret < 0){

2585

perror_plus("asprintf");

2586

continue;

2587

}

2588

ret = remove(fullname);

2589

if(ret == -1){

2590

fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,

2591

strerror(errno));

2592

}

2593

free(fullname);

2594

}

2595

}

2596

2597

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

2598

free(direntries);

2599

if(numentries == -1){

2600

perror_plus("scandir");

2601

}

2602

ret = rmdir(tempdir);

2603

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

2604

perror_plus("rmdir");

2605

}

3110

2606

}

3111

2607

3112

2608

if(quit_now){