/mandos/trunk : revision 821

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

40

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

41

42

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

43

stdout, ferror(), remove() */

43

stdout, ferror() */

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

50

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

49

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

50

asprintf(), strncpy() */

51

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

52

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

53

sockaddr_in6, PF_INET6,

57

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

58

inet_pton(), connect(),

59

getnameinfo() */

60

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

60

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

61

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

62

*/

63

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

64

strtoimax() */

65

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

65

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

66

EAI_SYSTEM, ENETUNREACH,

67

EHOSTUNREACH, ECONNREFUSED, EPROTO,

68

EIO, ENOENT, ENXIO, ENOMEM, EISDIR,

69

ENOTEMPTY,

66

70

program_invocation_short_name */

67

71

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

68

72

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

73

77

*/

74

78

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

75

79

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

76

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

80

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

81

unlinkat() */

77

82

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

78

83

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

79

84

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

233

238

.af = af };

234

239

if(new_server->ip == NULL){

235

240

perror_plus("strdup");

241

free(new_server);

236

242

return false;

237

243

}

238

244

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

239

245

if(ret == -1){

240

246

perror_plus("clock_gettime");

247

#ifdef __GNUC__

248

#pragma GCC diagnostic push

249

#pragma GCC diagnostic ignored "-Wcast-qual"

250

#endif

251

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

252

#ifdef __GNUC__

253

#pragma GCC diagnostic pop

254

#endif

255

free(new_server);

241

256

return false;

242

257

}

243

258

/* Special case of first server */

294

309

return false;

295

310

}

296

311

297

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

312

ret = close(fd);

298

313

if(ret == -1){

299

314

perror_plus("close");

300

315

}

482

497

return plaintext_length;

483

498

}

484

499

500

__attribute__((warn_unused_result, const))

501

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

502

if(str == NULL)

503

return "(unknown)";

504

return str;

505

}

506

485

507

__attribute__((warn_unused_result))

486

508

static const char *safer_gnutls_strerror(int value){

487

509

const char *ret = gnutls_strerror(value);

488

if(ret == NULL)

489

ret = "(unknown)";

490

return ret;

510

return safe_string(ret);

491

511

}

492

512

493

513

/* GnuTLS log function callback */

497

517

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

498

518

}

499

519

500

__attribute__((nonnull, warn_unused_result))

520

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

501

521

static int init_gnutls_global(const char *pubkeyfilename,

502

522

const char *seckeyfilename,

523

const char *dhparamsfilename,

503

524

mandos_context *mc){

504

525

int ret;

526

unsigned int uret;

505

527

506

528

if(debug){

507

529

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

508

530

}

509

531

510

ret = gnutls_global_init();

511

if(ret != GNUTLS_E_SUCCESS){

512

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

513

safer_gnutls_strerror(ret));

514

return -1;

515

}

516

517

532

if(debug){

518

533

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

519

534

* - GnuTLS manual

527

542

if(ret != GNUTLS_E_SUCCESS){

528

543

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

529

544

safer_gnutls_strerror(ret));

530

gnutls_global_deinit();

531

545

return -1;

532

546

}

533

547

558

572

safer_gnutls_strerror(ret));

559

573

goto globalfail;

560

574

}

561

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

562

if(ret != GNUTLS_E_SUCCESS){

563

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

564

safer_gnutls_strerror(ret));

565

goto globalfail;

566

}

567

575

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

576

if(dhparamsfilename != NULL){

577

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

578

do {

579

int dhpfile = open(dhparamsfilename, O_RDONLY);

580

if(dhpfile == -1){

581

perror_plus("open");

582

dhparamsfilename = NULL;

583

break;

584

}

585

size_t params_capacity = 0;

586

while(true){

587

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

588

(size_t)params.size,

589

(size_t)params_capacity);

590

if(params_capacity == 0){

591

perror_plus("incbuffer");

592

free(params.data);

593

params.data = NULL;

594

dhparamsfilename = NULL;

595

break;

596

}

597

ssize_t bytes_read = read(dhpfile,

598

params.data + params.size,

599

BUFFER_SIZE);

600

/* EOF */

601

if(bytes_read == 0){

602

break;

603

}

604

/* check bytes_read for failure */

605

if(bytes_read < 0){

606

perror_plus("read");

607

free(params.data);

608

params.data = NULL;

609

dhparamsfilename = NULL;

610

break;

611

}

612

params.size += (unsigned int)bytes_read;

613

}

614

if(params.data == NULL){

615

dhparamsfilename = NULL;

616

}

617

if(dhparamsfilename == NULL){

618

break;

619

}

620

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

621

GNUTLS_X509_FMT_PEM);

622

if(ret != GNUTLS_E_SUCCESS){

623

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

624

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

625

safer_gnutls_strerror(ret));

626

dhparamsfilename = NULL;

627

}

628

} while(false);

629

}

630

if(dhparamsfilename == NULL){

631

if(mc->dh_bits == 0){

632

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

633

/* Try to read the private key file */

634

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

635

do {

636

int secfile = open(seckeyfilename, O_RDONLY);

637

if(secfile == -1){

638

perror_plus("open");

639

break;

640

}

641

size_t buffer_capacity = 0;

642

while(true){

643

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

644

(size_t)buffer.size,

645

(size_t)buffer_capacity);

646

if(buffer_capacity == 0){

647

perror_plus("incbuffer");

648

free(buffer.data);

649

buffer.data = NULL;

650

break;

651

}

652

ssize_t bytes_read = read(secfile,

653

buffer.data + buffer.size,

654

BUFFER_SIZE);

655

/* EOF */

656

if(bytes_read == 0){

657

break;

658

}

659

/* check bytes_read for failure */

660

if(bytes_read < 0){

661

perror_plus("read");

662

free(buffer.data);

663

buffer.data = NULL;

664

break;

665

}

666

buffer.size += (unsigned int)bytes_read;

667

}

668

close(secfile);

669

} while(false);

670

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

671

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

672

if(buffer.data != NULL){

673

{

674

gnutls_openpgp_privkey_t privkey = NULL;

675

ret = gnutls_openpgp_privkey_init(&privkey);

676

if(ret != GNUTLS_E_SUCCESS){

677

fprintf_plus(stderr, "Error initializing OpenPGP key"

678

" structure: %s",

679

safer_gnutls_strerror(ret));

680

free(buffer.data);

681

buffer.data = NULL;

682

} else {

683

ret = gnutls_openpgp_privkey_import

684

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

685

if(ret != GNUTLS_E_SUCCESS){

686

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

687

safer_gnutls_strerror(ret));

688

privkey = NULL;

689

}

690

free(buffer.data);

691

buffer.data = NULL;

692

if(privkey != NULL){

693

/* Use private key to suggest an appropriate

694

sec_param */

695

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

696

gnutls_openpgp_privkey_deinit(privkey);

697

if(debug){

698

fprintf_plus(stderr, "This OpenPGP key implies using"

699

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

700

safe_string(gnutls_sec_param_get_name

701

(sec_param)));

702

}

703

}

704

}

705

}

706

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

707

/* Err on the side of caution */

708

sec_param = GNUTLS_SEC_PARAM_ULTRA;

709

if(debug){

710

fprintf_plus(stderr, "Falling back to security parameter"

711

" \"%s\"\n",

712

safe_string(gnutls_sec_param_get_name

713

(sec_param)));

714

}

715

}

716

}

717

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

718

if(uret != 0){

719

mc->dh_bits = uret;

720

if(debug){

721

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

722

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

723

safe_string(gnutls_sec_param_get_name

724

(sec_param)),

725

mc->dh_bits);

726

}

727

} else {

728

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

729

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

730

safe_string(gnutls_sec_param_get_name

731

(sec_param)),

732

safer_gnutls_strerror(ret));

733

goto globalfail;

734

}

735

} else if(debug){

736

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

737

mc->dh_bits);

738

}

739

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

740

if(ret != GNUTLS_E_SUCCESS){

741

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

742

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

743

safer_gnutls_strerror(ret));

744

goto globalfail;

745

}

746

}

568

747

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

569

748

570

749

return 0;

572

751

globalfail:

573

752

574

753

gnutls_certificate_free_credentials(mc->cred);

575

gnutls_global_deinit();

576

754

gnutls_dh_params_deinit(mc->dh_params);

577

755

return -1;

578

756

}

630

808

/* ignore client certificate if any. */

631

809

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

632

810

633

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

634

635

811

return 0;

636

812

}

637

813

639

815

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

640

816

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

641

817

818

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

819

__attribute__((warn_unused_result))

820

int raise_privileges(void){

821

int old_errno = errno;

822

int ret = 0;

823

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

824

ret = errno;

825

}

826

errno = old_errno;

827

return ret;

828

}

829

830

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

831

__attribute__((warn_unused_result))

832

int raise_privileges_permanently(void){

833

int old_errno = errno;

834

int ret = raise_privileges();

835

if(ret != 0){

836

errno = old_errno;

837

return ret;

838

}

839

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

840

ret = errno;

841

}

842

errno = old_errno;

843

return ret;

844

}

845

846

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

847

__attribute__((warn_unused_result))

848

int lower_privileges(void){

849

int old_errno = errno;

850

int ret = 0;

851

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

852

ret = errno;

853

}

854

errno = old_errno;

855

return ret;

856

}

857

858

/* Lower privileges permanently */

859

__attribute__((warn_unused_result))

860

int lower_privileges_permanently(void){

861

int old_errno = errno;

862

int ret = 0;

863

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

864

ret = errno;

865

}

866

errno = old_errno;

867

return ret;

868

}

869

870

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

871

__attribute__((nonnull, warn_unused_result))

872

static bool add_delete_local_route(const bool add,

873

const char *address,

874

AvahiIfIndex if_index){

875

int ret;

876

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

877

char add_arg[] = "add";

878

char delete_arg[] = "delete";

879

char debug_flag[] = "--debug";

880

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

881

if(pluginhelperdir == NULL){

882

if(debug){

883

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

884

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

885

}

886

return false;

887

}

888

889

char interface[IF_NAMESIZE];

890

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

891

perror_plus("if_indextoname");

892

return false;

893

}

894

895

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

896

if(devnull == -1){

897

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

898

return false;

899

}

900

pid_t pid = fork();

901

if(pid == 0){

902

/* Child */

903

/* Raise privileges */

904

errno = raise_privileges_permanently();

905

if(errno != 0){

906

perror_plus("Failed to raise privileges");

907

/* _exit(EX_NOPERM); */

908

} else {

909

/* Set group */

910

errno = 0;

911

ret = setgid(0);

912

if(ret == -1){

913

perror_plus("setgid");

914

_exit(EX_NOPERM);

915

}

916

/* Reset supplementary groups */

917

errno = 0;

918

ret = setgroups(0, NULL);

919

if(ret == -1){

920

perror_plus("setgroups");

921

_exit(EX_NOPERM);

922

}

923

}

924

ret = dup2(devnull, STDIN_FILENO);

925

if(ret == -1){

926

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

927

_exit(EX_OSERR);

928

}

929

ret = close(devnull);

930

if(ret == -1){

931

perror_plus("close");

932

_exit(EX_OSERR);

933

}

934

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

935

if(ret == -1){

936

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

937

_exit(EX_OSERR);

938

}

939

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

940

O_RDONLY

941

| O_DIRECTORY

942

| O_PATH

943

| O_CLOEXEC));

944

if(helperdir_fd == -1){

945

perror_plus("open");

946

_exit(EX_UNAVAILABLE);

947

}

948

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

949

helper, O_RDONLY));

950

if(helper_fd == -1){

951

perror_plus("openat");

952

close(helperdir_fd);

953

_exit(EX_UNAVAILABLE);

954

}

955

close(helperdir_fd);

956

#ifdef __GNUC__

957

#pragma GCC diagnostic push

958

#pragma GCC diagnostic ignored "-Wcast-qual"

959

#endif

960

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

961

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

962

interface, debug ? debug_flag : NULL, NULL },

963

environ) == -1){

964

#ifdef __GNUC__

965

#pragma GCC diagnostic pop

966

#endif

967

perror_plus("fexecve");

968

_exit(EXIT_FAILURE);

969

}

970

}

971

if(pid == -1){

972

perror_plus("fork");

973

return false;

974

}

975

int status;

976

pid_t pret = -1;

977

errno = 0;

978

do {

979

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

980

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

981

int errno_raising = 0;

982

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

983

errno_raising = errno;

984

perror_plus("Failed to raise privileges in order to"

985

" kill helper program");

986

}

987

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

988

perror_plus("kill");

989

}

990

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

991

perror_plus("Failed to lower privileges after killing"

992

" helper program");

993

}

994

return false;

995

}

996

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

997

if(pret == -1){

998

perror_plus("waitpid");

999

return false;

1000

}

1001

if(WIFEXITED(status)){

1002

if(WEXITSTATUS(status) != 0){

1003

fprintf_plus(stderr, "Error: iprouteadddel exited"

1004

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

1005

return false;

1006

}

1007

return true;

1008

}

1009

if(WIFSIGNALED(status)){

1010

fprintf_plus(stderr, "Error: iprouteadddel died by"

1011

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

1012

return false;

1013

}

1014

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

1015

return false;

1016

}

1017

1018

__attribute__((nonnull, warn_unused_result))

1019

static bool add_local_route(const char *address,

1020

AvahiIfIndex if_index){

1021

if(debug){

1022

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

1023

}

1024

return add_delete_local_route(true, address, if_index);

1025

}

1026

1027

__attribute__((nonnull, warn_unused_result))

1028

static bool delete_local_route(const char *address,

1029

AvahiIfIndex if_index){

1030

if(debug){

1031

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

1032

}

1033

return add_delete_local_route(false, address, if_index);

1034

}

1035

642

1036

/* Called when a Mandos server is found */

643

1037

__attribute__((nonnull, warn_unused_result))

644

1038

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

655

1049

int retval = -1;

656

1050

gnutls_session_t session;

657

1051

int pf; /* Protocol family */

1052

bool route_added = false;

658

1053

659

1054

errno = 0;

660

1055

718

1113

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

719

1114

}

720

1115

721

tcp_sd = socket(pf, SOCK_STREAM, 0);

1116

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

722

1117

if(tcp_sd < 0){

723

1118

int e = errno;

724

1119

perror_plus("socket");

731

1126

goto mandos_end;

732

1127

}

733

1128

734

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

735

1129

if(af == AF_INET6){

736

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

737

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

1130

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

1131

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

1132

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

738

1133

} else { /* IPv4 */

739

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

740

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

1134

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

1135

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

1136

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

741

1137

}

742

1138

if(ret < 0 ){

743

1139

int e = errno;

813

1209

goto mandos_end;

814

1210

}

815

1211

816

if(af == AF_INET6){

817

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

818

sizeof(struct sockaddr_in6));

819

} else {

820

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

821

sizeof(struct sockaddr_in));

822

}

823

if(ret < 0){

824

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

825

int e = errno;

826

perror_plus("connect");

827

errno = e;

828

}

829

goto mandos_end;

830

}

831

832

if(quit_now){

833

errno = EINTR;

834

goto mandos_end;

1212

while(true){

1213

if(af == AF_INET6){

1214

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

1215

sizeof(struct sockaddr_in6));

1216

} else {

1217

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

1218

sizeof(struct sockaddr_in));

1219

}

1220

if(ret < 0){

1221

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

1222

and if_index != AVAHI_IF_UNSPEC

1223

and connect_to == NULL

1224

and not route_added and

1225

((af == AF_INET6 and not

1226

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1227

&to)->sin6_addr)))

1228

or (af == AF_INET and

1229

/* Not a a IPv4LL address */

1230

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

1231

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

1232

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

1233

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

1234

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

1235

connect to a Mandos server announced by Avahi on a server

1236

host with a global address. Work around this by retrying

1237

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

1238

1239

Avahi bug reference:

1240

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

1241

https://bugs.debian.org/587961

1242

*/

1243

if(debug){

1244

fprintf_plus(stderr, "Mandos server unreachable, trying"

1245

" direct route\n");

1246

}

1247

int e = errno;

1248

route_added = add_local_route(ip, if_index);

1249

if(route_added){

1250

continue;

1251

}

1252

errno = e;

1253

}

1254

if(errno != ECONNREFUSED or debug){

1255

int e = errno;

1256

perror_plus("connect");

1257

errno = e;

1258

}

1259

goto mandos_end;

1260

}

1261

1262

if(quit_now){

1263

errno = EINTR;

1264

goto mandos_end;

1265

}

1266

break;

835

1267

}

836

1268

837

1269

const char *out = mandos_protocol_version;

1020

1452

1021

1453

mandos_end:

1022

1454

{

1455

if(route_added){

1456

if(not delete_local_route(ip, if_index)){

1457

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

1458

" interface %d", ip, if_index);

1459

}

1460

}

1023

1461

int e = errno;

1024

1462

free(decrypted_buffer);

1025

1463

free(buffer);

1026

1464

if(tcp_sd >= 0){

1027

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

1465

ret = close(tcp_sd);

1028

1466

}

1029

1467

if(ret == -1){

1030

1468

if(e == 0){

1065

1503

timed out */

1066

1504

1067

1505

if(quit_now){

1506

avahi_s_service_resolver_free(r);

1068

1507

return;

1069

1508

}

1070

1509

1184

1623

__attribute__((nonnull, warn_unused_result))

1185

1624

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

1186

1625

int ret;

1187

error_t ret_errno;

1626

int old_errno;

1188

1627

1189

1628

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

1190

1629

if(s < 0){

1191

ret_errno = errno;

1630

old_errno = errno;

1192

1631

perror_plus("socket");

1193

errno = ret_errno;

1632

errno = old_errno;

1194

1633

return false;

1195

1634

}

1196

strcpy(ifr->ifr_name, ifname);

1635

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

1636

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

1197

1637

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1198

1638

if(ret == -1){

1199

1639

if(debug){

1200

ret_errno = errno;

1640

old_errno = errno;

1201

1641

perror_plus("ioctl SIOCGIFFLAGS");

1202

errno = ret_errno;

1642

errno = old_errno;

1203

1643

}

1204

1644

return false;

1205

1645

}

1346

1786

return 0;

1347

1787

}

1348

1788

1349

char *fullname = NULL;

1350

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

1351

if(ret < 0){

1352

perror_plus("asprintf");

1353

return 0;

1354

}

1355

1356

ret = stat(fullname, &st);

1789

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

1357

1790

if(ret == -1){

1358

1791

if(debug){

1359

1792

perror_plus("Could not stat hook");

1360

1793

}

1361

1794

return 0;

1362

1795

}

1363

free(fullname);

1364

1796

if(not (S_ISREG(st.st_mode))){

1365

1797

/* Not a regular file */

1366

1798

if(debug){

1458

1890

}

1459

1891

}

1460

1892

1461

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

1462

__attribute__((warn_unused_result))

1463

error_t raise_privileges(void){

1464

error_t old_errno = errno;

1465

error_t ret_errno = 0;

1466

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

1467

ret_errno = errno;

1468

perror_plus("seteuid");

1469

}

1470

errno = old_errno;

1471

return ret_errno;

1472

}

1473

1474

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

1475

__attribute__((warn_unused_result))

1476

error_t raise_privileges_permanently(void){

1477

error_t old_errno = errno;

1478

error_t ret_errno = raise_privileges();

1479

if(ret_errno != 0){

1480

errno = old_errno;

1481

return ret_errno;

1482

}

1483

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

1484

ret_errno = errno;

1485

perror_plus("seteuid");

1486

}

1487

errno = old_errno;

1488

return ret_errno;

1489

}

1490

1491

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

1492

__attribute__((warn_unused_result))

1493

error_t lower_privileges(void){

1494

error_t old_errno = errno;

1495

error_t ret_errno = 0;

1496

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

1497

ret_errno = errno;

1498

perror_plus("seteuid");

1499

}

1500

errno = old_errno;

1501

return ret_errno;

1502

}

1503

1504

/* Lower privileges permanently */

1505

__attribute__((warn_unused_result))

1506

error_t lower_privileges_permanently(void){

1507

error_t old_errno = errno;

1508

error_t ret_errno = 0;

1509

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

1510

ret_errno = errno;

1511

perror_plus("setuid");

1512

}

1513

errno = old_errno;

1514

return ret_errno;

1515

}

1516

1517

#ifndef O_CLOEXEC

1518

/*

1519

* Based on the example in the GNU LibC manual chapter 13.13 "File

1520

* Descriptor Flags".

1521

| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |

1522

*/

1523

__attribute__((warn_unused_result))

1524

static int set_cloexec_flag(int fd){

1525

int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));

1526

/* If reading the flags failed, return error indication now. */

1527

if(ret < 0){

1528

return ret;

1529

}

1530

/* Store modified flag word in the descriptor. */

1531

return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,

1532

ret | FD_CLOEXEC));

1533

}

1534

#endif /* not O_CLOEXEC */

1535

1536

1893

__attribute__((nonnull))

1537

1894

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

1538

1895

const float delay){

1539

struct dirent **direntries;

1896

struct dirent **direntries = NULL;

1540

1897

if(hookdir_fd == -1){

1541

hookdir_fd = open(hookdir, O_RDONLY |

1542

#ifdef O_CLOEXEC

1543

O_CLOEXEC

1544

#else /* not O_CLOEXEC */

1545

0

1546

#endif /* not O_CLOEXEC */

1547

);

1898

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1899

| O_CLOEXEC);

1548

1900

if(hookdir_fd == -1){

1549

1901

if(errno == ENOENT){

1550

1902

if(debug){

1556

1908

}

1557

1909

return;

1558

1910

}

1559

#ifndef O_CLOEXEC

1560

if(set_cloexec_flag(hookdir_fd) < 0){

1561

perror_plus("set_cloexec_flag");

1562

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

1563

perror_plus("close");

1564

} else {

1565

hookdir_fd = -1;

1566

}

1567

return;

1568

}

1569

#endif /* not O_CLOEXEC */

1570

1911

}

1571

#ifdef __GLIBC__

1572

#if __GLIBC_PREREQ(2, 15)

1573

1912

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

1574

1913

runnable_hook, alphasort);

1575

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

1576

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

1577

alphasort);

1578

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

1579

#else /* not __GLIBC__ */

1580

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

1581

alphasort);

1582

#endif /* not __GLIBC__ */

1583

1914

if(numhooks == -1){

1584

1915

perror_plus("scandir");

1585

1916

return;

1586

1917

}

1587

1918

struct dirent *direntry;

1588

1919

int ret;

1589

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

1920

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

1921

if(devnull == -1){

1922

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

1923

return;

1924

}

1590

1925

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

1591

1926

direntry = direntries[i];

1592

char *fullname = NULL;

1593

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

1594

if(ret < 0){

1595

perror_plus("asprintf");

1596

continue;

1597

}

1598

1927

if(debug){

1599

1928

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

1600

1929

direntry->d_name);

1603

1932

if(hook_pid == 0){

1604

1933

/* Child */

1605

1934

/* Raise privileges */

1606

if(raise_privileges_permanently() != 0){

1935

errno = raise_privileges_permanently();

1936

if(errno != 0){

1607

1937

perror_plus("Failed to raise privileges");

1608

1938

_exit(EX_NOPERM);

1609

1939

}

1621

1951

perror_plus("setgroups");

1622

1952

_exit(EX_NOPERM);

1623

1953

}

1624

ret = dup2(devnull, STDIN_FILENO);

1625

if(ret == -1){

1626

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

1627

_exit(EX_OSERR);

1628

}

1629

ret = close(devnull);

1630

if(ret == -1){

1631

perror_plus("close");

1632

_exit(EX_OSERR);

1633

}

1634

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1635

if(ret == -1){

1636

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

1637

_exit(EX_OSERR);

1638

}

1639

1954

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

1640

1955

if(ret == -1){

1641

1956

perror_plus("setenv");

1676

1991

_exit(EX_OSERR);

1677

1992

}

1678

1993

}

1679

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

1680

perror_plus("execl");

1994

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

1995

direntry->d_name,

1996

O_RDONLY));

1997

if(hook_fd == -1){

1998

perror_plus("openat");

1999

_exit(EXIT_FAILURE);

2000

}

2001

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

2002

perror_plus("close");

2003

_exit(EXIT_FAILURE);

2004

}

2005

ret = dup2(devnull, STDIN_FILENO);

2006

if(ret == -1){

2007

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

2008

_exit(EX_OSERR);

2009

}

2010

ret = close(devnull);

2011

if(ret == -1){

2012

perror_plus("close");

2013

_exit(EX_OSERR);

2014

}

2015

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2016

if(ret == -1){

2017

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

2018

_exit(EX_OSERR);

2019

}

2020

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

2021

environ) == -1){

2022

perror_plus("fexecve");

1681

2023

_exit(EXIT_FAILURE);

1682

2024

}

1683

2025

} else {

2026

if(hook_pid == -1){

2027

perror_plus("fork");

2028

free(direntry);

2029

continue;

2030

}

1684

2031

int status;

1685

2032

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

1686

2033

perror_plus("waitpid");

1687

free(fullname);

2034

free(direntry);

1688

2035

continue;

1689

2036

}

1690

2037

if(WIFEXITED(status)){

1692

2039

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

1693

2040

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

1694

2041

WEXITSTATUS(status));

1695

free(fullname);

2042

free(direntry);

1696

2043

continue;

1697

2044

}

1698

2045

} else if(WIFSIGNALED(status)){

1699

2046

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

1700

2047

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

1701

2048

WTERMSIG(status));

1702

free(fullname);

2049

free(direntry);

1703

2050

continue;

1704

2051

} else {

1705

2052

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

1706

2053

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

1707

free(fullname);

2054

free(direntry);

1708

2055

continue;

1709

2056

}

1710

2057

}

1711

free(fullname);

1712

2058

if(debug){

1713

2059

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

1714

2060

direntry->d_name);

1715

2061

}

2062

free(direntry);

1716

2063

}

1717

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

2064

free(direntries);

2065

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

1718

2066

perror_plus("close");

1719

2067

} else {

1720

2068

hookdir_fd = -1;

1723

2071

}

1724

2072

1725

2073

__attribute__((nonnull, warn_unused_result))

1726

error_t bring_up_interface(const char *const interface,

1727

const float delay){

1728

error_t old_errno = errno;

2074

int bring_up_interface(const char *const interface,

2075

const float delay){

2076

int old_errno = errno;

1729

2077

int ret;

1730

2078

struct ifreq network;

1731

2079

unsigned int if_index = if_nametoindex(interface);

1741

2089

}

1742

2090

1743

2091

if(not interface_is_up(interface)){

1744

error_t ret_errno = 0, ioctl_errno = 0;

2092

int ret_errno = 0;

2093

int ioctl_errno = 0;

1745

2094

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

1746

2095

ret_errno = errno;

1747

2096

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

1760

2109

}

1761

2110

1762

2111

if(quit_now){

1763

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

2112

ret = close(sd);

1764

2113

if(ret == -1){

1765

2114

perror_plus("close");

1766

2115

}

1776

2125

/* Raise privileges */

1777

2126

ret_errno = raise_privileges();

1778

2127

if(ret_errno != 0){

2128

errno = ret_errno;

1779

2129

perror_plus("Failed to raise privileges");

1780

2130

}

1781

2131

1815

2165

}

1816

2166

1817

2167

/* Close the socket */

1818

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

2168

ret = close(sd);

1819

2169

if(ret == -1){

1820

2170

perror_plus("close");

1821

2171

}

1849

2199

}

1850

2200

1851

2201

__attribute__((nonnull, warn_unused_result))

1852

error_t take_down_interface(const char *const interface){

1853

error_t old_errno = errno;

2202

int take_down_interface(const char *const interface){

2203

int old_errno = errno;

1854

2204

struct ifreq network;

1855

2205

unsigned int if_index = if_nametoindex(interface);

1856

2206

if(if_index == 0){

1859

2209

return ENXIO;

1860

2210

}

1861

2211

if(interface_is_up(interface)){

1862

error_t ret_errno = 0, ioctl_errno = 0;

2212

int ret_errno = 0;

2213

int ioctl_errno = 0;

1863

2214

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

1864

2215

ret_errno = errno;

1865

2216

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

1885

2236

/* Raise privileges */

1886

2237

ret_errno = raise_privileges();

1887

2238

if(ret_errno != 0){

2239

errno = ret_errno;

1888

2240

perror_plus("Failed to raise privileges");

1889

2241

}

1890

2242

1902

2254

}

1903

2255

1904

2256

/* Close the socket */

1905

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

2257

int ret = close(sd);

1906

2258

if(ret == -1){

1907

2259

perror_plus("close");

1908

2260

}

1923

2275

}

1924

2276

1925

2277

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

1926

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

1927

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

1928

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

1929

.interfaces = NULL, .interfaces_size = 0 };

2278

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

2279

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

2280

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

2281

.current_server = NULL, .interfaces = NULL,

2282

.interfaces_size = 0 };

1930

2283

AvahiSServiceBrowser *sb = NULL;

1931

2284

error_t ret_errno;

1932

2285

int ret;

1941

2294

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1942

2295

const char *seckey = PATHDIR "/" SECKEY;

1943

2296

const char *pubkey = PATHDIR "/" PUBKEY;

2297

const char *dh_params_file = NULL;

1944

2298

char *interfaces_hooks = NULL;

1945

2299

1946

2300

bool gnutls_initialized = false;

1999

2353

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

2000

2354

" Diffie-Hellman key exchange",

2001

2355

.group = 2 },

2356

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

2357

.arg = "FILE",

2358

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

2359

" for the Diffie-Hellman key exchange",

2360

.group = 2 },

2002

2361

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

2003

2362

.arg = "STRING",

2004

2363

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

2059

2418

}

2060

2419

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

2061

2420

break;

2421

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

2422

dh_params_file = arg;

2423

break;

2062

2424

case 130: /* --priority */

2063

2425

mc.priority = arg;

2064

2426

break;

2104

2466

.args_doc = "",

2105

2467

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

2106

2468

" passwords from a Mandos server" };

2107

ret = argp_parse(&argp, argc, argv,

2108

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2109

switch(ret){

2469

ret_errno = argp_parse(&argp, argc, argv,

2470

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2471

switch(ret_errno){

2110

2472

case 0:

2111

2473

break;

2112

2474

case ENOMEM:

2113

2475

default:

2114

errno = ret;

2476

errno = ret_errno;

2115

2477

perror_plus("argp_parse");

2116

2478

exitcode = EX_OSERR;

2117

2479

goto end;

2120

2482

goto end;

2121

2483

}

2122

2484

}

2123

2485

2124

2486

{

2125

2487

/* Work around Debian bug #633582:

2126

2488

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

2127

2489

2128

2490

/* Re-raise privileges */

2129

ret_errno = raise_privileges();

2130

if(ret_errno != 0){

2131

errno = ret_errno;

2491

ret = raise_privileges();

2492

if(ret != 0){

2493

errno = ret;

2132

2494

perror_plus("Failed to raise privileges");

2133

2495

} else {

2134

2496

struct stat st;

2150

2512

}

2151

2513

}

2152

2514

}

2153

TEMP_FAILURE_RETRY(close(seckey_fd));

2515

close(seckey_fd);

2154

2516

}

2155

2517

}

2156

2518

2157

2519

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

2158

2520

int pubkey_fd = open(pubkey, O_RDONLY);

2159

2521

if(pubkey_fd == -1){

2171

2533

}

2172

2534

}

2173

2535

}

2174

TEMP_FAILURE_RETRY(close(pubkey_fd));

2175

}

2176

}

2177

2536

close(pubkey_fd);

2537

}

2538

}

2539

2540

if(dh_params_file != NULL

2541

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

2542

int dhparams_fd = open(dh_params_file, O_RDONLY);

2543

if(dhparams_fd == -1){

2544

perror_plus("open");

2545

} else {

2546

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

2547

if(ret == -1){

2548

perror_plus("fstat");

2549

} else {

2550

if(S_ISREG(st.st_mode)

2551

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

2552

ret = fchown(dhparams_fd, uid, gid);

2553

if(ret == -1){

2554

perror_plus("fchown");

2555

}

2556

}

2557

}

2558

close(dhparams_fd);

2559

}

2560

}

2561

2178

2562

/* Lower privileges */

2179

ret_errno = lower_privileges();

2180

if(ret_errno != 0){

2181

errno = ret_errno;

2563

ret = lower_privileges();

2564

if(ret != 0){

2565

errno = ret;

2182

2566

perror_plus("Failed to lower privileges");

2183

2567

}

2184

2568

}

2297

2681

2298

2682

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

2299

2683

if(mc.interfaces == NULL){

2300

struct dirent **direntries;

2684

struct dirent **direntries = NULL;

2301

2685

/* Look for any good interfaces */

2302

2686

ret = scandir(sys_class_net, &direntries, good_interface,

2303

2687

alphasort);

2309

2693

if(ret_errno != 0){

2310

2694

errno = ret_errno;

2311

2695

perror_plus("argz_add");

2696

free(direntries[i]);

2312

2697

continue;

2313

2698

}

2314

2699

if(debug){

2315

2700

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

2316

2701

direntries[i]->d_name);

2317

2702

}

2703

free(direntries[i]);

2318

2704

}

2319

2705

free(direntries);

2320

2706

} else {

2321

free(direntries);

2707

if(ret == 0){

2708

free(direntries);

2709

}

2322

2710

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

2323

2711

exitcode = EXIT_FAILURE;

2324

2712

goto end;

2350

2738

errno = bring_up_interface(interface, delay);

2351

2739

if(not interface_was_up){

2352

2740

if(errno != 0){

2353

perror_plus("Failed to bring up interface");

2741

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

2742

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

2354

2743

} else {

2355

2744

errno = argz_add(&interfaces_to_take_down,

2356

2745

&interfaces_to_take_down_size,

2379

2768

goto end;

2380

2769

}

2381

2770

2382

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

2771

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

2383

2772

if(ret == -1){

2384

2773

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

2385

2774

exitcode = EX_UNAVAILABLE;

2507

2896

2508

2897

/* Allocate a new server */

2509

2898

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2510

&config, NULL, NULL, &ret_errno);

2899

&config, NULL, NULL, &ret);

2511

2900

2512

2901

/* Free the Avahi configuration data */

2513

2902

avahi_server_config_free(&config);

2516

2905

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

2517

2906

if(mc.server == NULL){

2518

2907

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

2519

avahi_strerror(ret_errno));

2908

avahi_strerror(ret));

2520

2909

exitcode = EX_UNAVAILABLE;

2521

2910

goto end;

2522

2911

}

2574

2963

2575

2964

if(gnutls_initialized){

2576

2965

gnutls_certificate_free_credentials(mc.cred);

2577

gnutls_global_deinit();

2578

2966

gnutls_dh_params_deinit(mc.dh_params);

2579

2967

}

2580

2968

2588

2976

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

2589

2977

while(mc.current_server != NULL){

2590

2978

server *next = mc.current_server->next;

2979

#ifdef __GNUC__

2980

#pragma GCC diagnostic push

2981

#pragma GCC diagnostic ignored "-Wcast-qual"

2982

#endif

2983

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

2984

#ifdef __GNUC__

2985

#pragma GCC diagnostic pop

2986

#endif

2591

2987

free(mc.current_server);

2592

2988

mc.current_server = next;

2593

2989

}

2595

2991

2596

2992

/* Re-raise privileges */

2597

2993

{

2598

ret_errno = raise_privileges();

2599

if(ret_errno != 0){

2994

ret = raise_privileges();

2995

if(ret != 0){

2996

errno = ret;

2600

2997

perror_plus("Failed to raise privileges");

2601

2998

} else {

2602

2999

2610

3007

while((interface=argz_next(interfaces_to_take_down,

2611

3008

interfaces_to_take_down_size,

2612

3009

interface))){

2613

ret_errno = take_down_interface(interface);

2614

if(ret_errno != 0){

2615

errno = ret_errno;

3010

ret = take_down_interface(interface);

3011

if(ret != 0){

3012

errno = ret;

2616

3013

perror_plus("Failed to take down interface");

2617

3014

}

2618

3015

}

2623

3020

}

2624

3021

}

2625

3022

2626

ret_errno = lower_privileges_permanently();

2627

if(ret_errno != 0){

3023

ret = lower_privileges_permanently();

3024

if(ret != 0){

3025

errno = ret;

2628

3026

perror_plus("Failed to lower privileges permanently");

2629

3027

}

2630

3028

}

2632

3030

free(interfaces_to_take_down);

2633

3031

free(interfaces_hooks);

2634

3032

3033

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

3034

uintmax_t level){

3035

struct dirent **direntries = NULL;

3036

int dret;

3037

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

3038

O_RDONLY

3039

| O_NOFOLLOW

3040

| O_DIRECTORY

3041

| O_PATH));

3042

if(dir_fd == -1){

3043

perror_plus("open");

3044

}

3045

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

3046

notdotentries, alphasort);

3047

if(numentries >= 0){

3048

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

3049

if(debug){

3050

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

3051

dirname, direntries[i]->d_name);

3052

}

3053

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

3054

if(dret == -1){

3055

if(errno == EISDIR){

3056

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

3057

AT_REMOVEDIR);

3058

}

3059

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

3060

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

3061

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

3062

/* Recurse only in this special case */

3063

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

3064

dret = 0;

3065

}

3066

if(dret == -1){

3067

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

3068

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

3069

}

3070

}

3071

free(direntries[i]);

3072

}

3073

3074

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

3075

free(direntries);

3076

if(numentries == -1){

3077

perror_plus("scandirat");

3078

}

3079

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3080

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

3081

perror_plus("rmdir");

3082

}

3083

} else {

3084

perror_plus("scandirat");

3085

}

3086

close(dir_fd);

3087

}

3088

2635

3089

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

2636

3090

if(tempdir != NULL){

2637

struct dirent **direntries = NULL;

2638

struct dirent *direntry = NULL;

2639

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

2640

alphasort);

2641

if(numentries > 0){

2642

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

2643

direntry = direntries[i];

2644

char *fullname = NULL;

2645

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

2646

direntry->d_name);

2647

if(ret < 0){

2648

perror_plus("asprintf");

2649

continue;

2650

}

2651

ret = remove(fullname);

2652

if(ret == -1){

2653

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

2654

strerror(errno));

2655

}

2656

free(fullname);

2657

}

2658

}

2659

2660

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

2661

free(direntries);

2662

if(numentries == -1){

2663

perror_plus("scandir");

2664

}

2665

ret = rmdir(tempdir);

2666

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

2667

perror_plus("rmdir");

2668

}

3091

clean_dir_at(-1, tempdir, 0);

2669

3092

}

2670

3093

2671

3094

if(quit_now){