/mandos/release : revision 237.7.231

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() */

49

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

50

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

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(), unlinkat() */

60

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

61

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

62

*/

63

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

73

*/

74

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

75

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

76

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

77

unlinkat() */

76

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

78

77

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

79

78

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

80

79

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

142

141

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

143

142

char *connect_to = NULL;

144

143

const char *hookdir = HOOKDIR;

145

int hookdir_fd = -1;

146

144

uid_t uid = 65534;

147

145

gid_t gid = 65534;

148

146

234

232

.af = af };

235

233

if(new_server->ip == NULL){

236

234

perror_plus("strdup");

237

free(new_server);

238

235

return false;

239

236

}

240

237

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

241

238

if(ret == -1){

242

239

perror_plus("clock_gettime");

243

#ifdef __GNUC__

244

#pragma GCC diagnostic push

245

#pragma GCC diagnostic ignored "-Wcast-qual"

246

#endif

247

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

248

#ifdef __GNUC__

249

#pragma GCC diagnostic pop

250

#endif

251

free(new_server);

252

240

return false;

253

241

}

254

242

/* Special case of first server */

305

293

return false;

306

294

}

307

295

308

ret = close(fd);

296

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

309

297

if(ret == -1){

310

298

perror_plus("close");

311

299

}

493

481

return plaintext_length;

494

482

}

495

483

496

__attribute__((warn_unused_result, const))

497

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

498

if(str == NULL)

499

return "(unknown)";

500

return str;

501

}

502

503

484

__attribute__((warn_unused_result))

504

485

static const char *safer_gnutls_strerror(int value){

505

486

const char *ret = gnutls_strerror(value);

506

return safe_string(ret);

487

if(ret == NULL)

488

ret = "(unknown)";

489

return ret;

507

490

}

508

491

509

492

/* GnuTLS log function callback */

513

496

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

514

497

}

515

498

516

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

499

__attribute__((nonnull, warn_unused_result))

517

500

static int init_gnutls_global(const char *pubkeyfilename,

518

501

const char *seckeyfilename,

519

const char *dhparamsfilename,

520

502

mandos_context *mc){

521

503

int ret;

522

unsigned int uret;

523

504

524

505

if(debug){

525

506

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

526

507

}

527

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

528

516

if(debug){

529

517

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

530

518

* - GnuTLS manual

538

526

if(ret != GNUTLS_E_SUCCESS){

539

527

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

540

528

safer_gnutls_strerror(ret));

529

gnutls_global_deinit();

541

530

return -1;

542

531

}

543

532

568

557

safer_gnutls_strerror(ret));

569

558

goto globalfail;

570

559

}

571

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

572

if(dhparamsfilename != NULL){

573

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

574

do {

575

int dhpfile = open(dhparamsfilename, O_RDONLY);

576

if(dhpfile == -1){

577

perror_plus("open");

578

dhparamsfilename = NULL;

579

break;

580

}

581

size_t params_capacity = 0;

582

while(true){

583

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

584

(size_t)params.size,

585

(size_t)params_capacity);

586

if(params_capacity == 0){

587

perror_plus("incbuffer");

588

free(params.data);

589

params.data = NULL;

590

dhparamsfilename = NULL;

591

break;

592

}

593

ssize_t bytes_read = read(dhpfile,

594

params.data + params.size,

595

BUFFER_SIZE);

596

/* EOF */

597

if(bytes_read == 0){

598

break;

599

}

600

/* check bytes_read for failure */

601

if(bytes_read < 0){

602

perror_plus("read");

603

free(params.data);

604

params.data = NULL;

605

dhparamsfilename = NULL;

606

break;

607

}

608

params.size += (unsigned int)bytes_read;

609

}

610

if(params.data == NULL){

611

dhparamsfilename = NULL;

612

}

613

if(dhparamsfilename == NULL){

614

break;

615

}

616

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

617

GNUTLS_X509_FMT_PEM);

618

if(ret != GNUTLS_E_SUCCESS){

619

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

620

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

621

safer_gnutls_strerror(ret));

622

dhparamsfilename = NULL;

623

}

624

} while(false);

625

}

626

if(dhparamsfilename == NULL){

627

if(mc->dh_bits == 0){

628

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

629

/* Try to read the private key file */

630

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

631

do {

632

int secfile = open(seckeyfilename, O_RDONLY);

633

if(secfile == -1){

634

perror_plus("open");

635

break;

636

}

637

size_t buffer_capacity = 0;

638

while(true){

639

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

640

(size_t)buffer.size,

641

(size_t)buffer_capacity);

642

if(buffer_capacity == 0){

643

perror_plus("incbuffer");

644

free(buffer.data);

645

buffer.data = NULL;

646

break;

647

}

648

ssize_t bytes_read = read(secfile,

649

buffer.data + buffer.size,

650

BUFFER_SIZE);

651

/* EOF */

652

if(bytes_read == 0){

653

break;

654

}

655

/* check bytes_read for failure */

656

if(bytes_read < 0){

657

perror_plus("read");

658

free(buffer.data);

659

buffer.data = NULL;

660

break;

661

}

662

buffer.size += (unsigned int)bytes_read;

663

}

664

close(secfile);

665

} while(false);

666

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

667

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

668

if(buffer.data != NULL){

669

{

670

gnutls_openpgp_privkey_t privkey = NULL;

671

ret = gnutls_openpgp_privkey_init(&privkey);

672

if(ret != GNUTLS_E_SUCCESS){

673

fprintf_plus(stderr, "Error initializing OpenPGP key"

674

" structure: %s",

675

safer_gnutls_strerror(ret));

676

free(buffer.data);

677

buffer.data = NULL;

678

} else {

679

ret = gnutls_openpgp_privkey_import

680

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

681

if(ret != GNUTLS_E_SUCCESS){

682

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

683

safer_gnutls_strerror(ret));

684

privkey = NULL;

685

}

686

free(buffer.data);

687

buffer.data = NULL;

688

if(privkey != NULL){

689

/* Use private key to suggest an appropriate

690

sec_param */

691

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

692

gnutls_openpgp_privkey_deinit(privkey);

693

if(debug){

694

fprintf_plus(stderr, "This OpenPGP key implies using"

695

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

696

safe_string(gnutls_sec_param_get_name

697

(sec_param)));

698

}

699

}

700

}

701

}

702

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

703

/* Err on the side of caution */

704

sec_param = GNUTLS_SEC_PARAM_ULTRA;

705

if(debug){

706

fprintf_plus(stderr, "Falling back to security parameter"

707

" \"%s\"\n",

708

safe_string(gnutls_sec_param_get_name

709

(sec_param)));

710

}

711

}

712

}

713

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

714

if(uret != 0){

715

mc->dh_bits = uret;

716

if(debug){

717

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

718

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

719

safe_string(gnutls_sec_param_get_name

720

(sec_param)),

721

mc->dh_bits);

722

}

723

} else {

724

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

725

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

726

safe_string(gnutls_sec_param_get_name

727

(sec_param)),

728

safer_gnutls_strerror(ret));

729

goto globalfail;

730

}

731

} else if(debug){

732

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

733

mc->dh_bits);

734

}

735

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

736

if(ret != GNUTLS_E_SUCCESS){

737

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

738

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

739

safer_gnutls_strerror(ret));

740

goto globalfail;

741

}

742

}

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

743

567

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

744

568

745

569

return 0;

747

571

globalfail:

748

572

749

573

gnutls_certificate_free_credentials(mc->cred);

574

gnutls_global_deinit();

750

575

gnutls_dh_params_deinit(mc->dh_params);

751

576

return -1;

752

577

}

804

629

/* ignore client certificate if any. */

805

630

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

806

631

632

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

633

807

634

return 0;

808

635

}

809

636

811

638

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

812

639

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

813

640

814

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

815

__attribute__((warn_unused_result))

816

error_t raise_privileges(void){

817

error_t old_errno = errno;

818

error_t ret_errno = 0;

819

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

820

ret_errno = errno;

821

}

822

errno = old_errno;

823

return ret_errno;

824

}

825

826

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

827

__attribute__((warn_unused_result))

828

error_t raise_privileges_permanently(void){

829

error_t old_errno = errno;

830

error_t ret_errno = raise_privileges();

831

if(ret_errno != 0){

832

errno = old_errno;

833

return ret_errno;

834

}

835

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

836

ret_errno = errno;

837

}

838

errno = old_errno;

839

return ret_errno;

840

}

841

842

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

843

__attribute__((warn_unused_result))

844

error_t lower_privileges(void){

845

error_t old_errno = errno;

846

error_t ret_errno = 0;

847

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

848

ret_errno = errno;

849

}

850

errno = old_errno;

851

return ret_errno;

852

}

853

854

/* Lower privileges permanently */

855

__attribute__((warn_unused_result))

856

error_t lower_privileges_permanently(void){

857

error_t old_errno = errno;

858

error_t ret_errno = 0;

859

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

860

ret_errno = errno;

861

}

862

errno = old_errno;

863

return ret_errno;

864

}

865

866

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

867

__attribute__((nonnull, warn_unused_result))

868

static bool add_delete_local_route(const bool add,

869

const char *address,

870

AvahiIfIndex if_index){

871

int ret;

872

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

873

char add_arg[] = "add";

874

char delete_arg[] = "delete";

875

char debug_flag[] = "--debug";

876

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

877

if(pluginhelperdir == NULL){

878

if(debug){

879

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

880

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

881

}

882

return false;

883

}

884

885

char interface[IF_NAMESIZE];

886

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

887

perror_plus("if_indextoname");

888

return false;

889

}

890

891

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

892

if(devnull == -1){

893

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

894

return false;

895

}

896

pid_t pid = fork();

897

if(pid == 0){

898

/* Child */

899

/* Raise privileges */

900

errno = raise_privileges_permanently();

901

if(errno != 0){

902

perror_plus("Failed to raise privileges");

903

/* _exit(EX_NOPERM); */

904

} else {

905

/* Set group */

906

errno = 0;

907

ret = setgid(0);

908

if(ret == -1){

909

perror_plus("setgid");

910

_exit(EX_NOPERM);

911

}

912

/* Reset supplementary groups */

913

errno = 0;

914

ret = setgroups(0, NULL);

915

if(ret == -1){

916

perror_plus("setgroups");

917

_exit(EX_NOPERM);

918

}

919

}

920

ret = dup2(devnull, STDIN_FILENO);

921

if(ret == -1){

922

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

923

_exit(EX_OSERR);

924

}

925

ret = close(devnull);

926

if(ret == -1){

927

perror_plus("close");

928

_exit(EX_OSERR);

929

}

930

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

931

if(ret == -1){

932

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

933

_exit(EX_OSERR);

934

}

935

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

936

O_RDONLY

937

| O_DIRECTORY

938

| O_PATH

939

| O_CLOEXEC));

940

if(helperdir_fd == -1){

941

perror_plus("open");

942

_exit(EX_UNAVAILABLE);

943

}

944

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

945

helper, O_RDONLY));

946

if(helper_fd == -1){

947

perror_plus("openat");

948

close(helperdir_fd);

949

_exit(EX_UNAVAILABLE);

950

}

951

close(helperdir_fd);

952

#ifdef __GNUC__

953

#pragma GCC diagnostic push

954

#pragma GCC diagnostic ignored "-Wcast-qual"

955

#endif

956

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

957

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

958

interface, debug ? debug_flag : NULL, NULL },

959

environ) == -1){

960

#ifdef __GNUC__

961

#pragma GCC diagnostic pop

962

#endif

963

perror_plus("fexecve");

964

_exit(EXIT_FAILURE);

965

}

966

}

967

if(pid == -1){

968

perror_plus("fork");

969

return false;

970

}

971

int status;

972

pid_t pret = -1;

973

errno = 0;

974

do {

975

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

976

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

977

int errno_raising = 0;

978

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

979

errno_raising = errno;

980

perror_plus("Failed to raise privileges in order to"

981

" kill helper program");

982

}

983

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

984

perror_plus("kill");

985

}

986

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

987

perror_plus("Failed to lower privileges after killing"

988

" helper program");

989

}

990

return false;

991

}

992

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

993

if(pret == -1){

994

perror_plus("waitpid");

995

return false;

996

}

997

if(WIFEXITED(status)){

998

if(WEXITSTATUS(status) != 0){

999

fprintf_plus(stderr, "Error: iprouteadddel exited"

1000

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

1001

return false;

1002

}

1003

return true;

1004

}

1005

if(WIFSIGNALED(status)){

1006

fprintf_plus(stderr, "Error: iprouteadddel died by"

1007

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

1008

return false;

1009

}

1010

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

1011

return false;

1012

}

1013

1014

__attribute__((nonnull, warn_unused_result))

1015

static bool add_local_route(const char *address,

1016

AvahiIfIndex if_index){

1017

if(debug){

1018

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

1019

}

1020

return add_delete_local_route(true, address, if_index);

1021

}

1022

1023

__attribute__((nonnull, warn_unused_result))

1024

static bool delete_local_route(const char *address,

1025

AvahiIfIndex if_index){

1026

if(debug){

1027

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

1028

}

1029

return add_delete_local_route(false, address, if_index);

1030

}

1031

1032

641

/* Called when a Mandos server is found */

1033

642

__attribute__((nonnull, warn_unused_result))

1034

643

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

1045

654

int retval = -1;

1046

655

gnutls_session_t session;

1047

656

int pf; /* Protocol family */

1048

bool route_added = false;

1049

657

1050

658

errno = 0;

1051

659

1109

717

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

1110

718

}

1111

719

1112

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

720

tcp_sd = socket(pf, SOCK_STREAM, 0);

1113

721

if(tcp_sd < 0){

1114

722

int e = errno;

1115

723

perror_plus("socket");

1122

730

goto mandos_end;

1123

731

}

1124

732

733

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

1125

734

if(af == AF_INET6){

1126

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

1127

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

1128

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);

1129

737

} else { /* IPv4 */

1130

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

1131

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

1132

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);

1133

740

}

1134

741

if(ret < 0 ){

1135

742

int e = errno;

1205

812

goto mandos_end;

1206

813

}

1207

814

1208

while(true){

1209

if(af == AF_INET6){

1210

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

1211

sizeof(struct sockaddr_in6));

1212

} else {

1213

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

1214

sizeof(struct sockaddr_in));

1215

}

1216

if(ret < 0){

1217

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

1218

and if_index != AVAHI_IF_UNSPEC

1219

and connect_to == NULL

1220

and not route_added and

1221

((af == AF_INET6 and not

1222

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1223

&to)->sin6_addr)))

1224

or (af == AF_INET and

1225

/* Not a a IPv4LL address */

1226

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

1227

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

1228

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

1229

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

1230

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

1231

connect to a Mandos server announced by Avahi on a server

1232

host with a global address. Work around this by retrying

1233

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

1234

1235

Avahi bug reference:

1236

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

1237

https://bugs.debian.org/587961

1238

*/

1239

if(debug){

1240

fprintf_plus(stderr, "Mandos server unreachable, trying"

1241

" direct route\n");

1242

}

1243

int e = errno;

1244

route_added = add_local_route(ip, if_index);

1245

if(route_added){

1246

continue;

1247

}

1248

errno = e;

1249

}

1250

if(errno != ECONNREFUSED or debug){

1251

int e = errno;

1252

perror_plus("connect");

1253

errno = e;

1254

}

1255

goto mandos_end;

1256

}

1257

1258

if(quit_now){

1259

errno = EINTR;

1260

goto mandos_end;

1261

}

1262

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;

1263

834

}

1264

835

1265

836

const char *out = mandos_protocol_version;

1448

1019

1449

1020

mandos_end:

1450

1021

{

1451

if(route_added){

1452

if(not delete_local_route(ip, if_index)){

1453

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

1454

" interface %d", ip, if_index);

1455

}

1456

}

1457

1022

int e = errno;

1458

1023

free(decrypted_buffer);

1459

1024

free(buffer);

1460

1025

if(tcp_sd >= 0){

1461

ret = close(tcp_sd);

1026

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

1462

1027

}

1463

1028

if(ret == -1){

1464

1029

if(e == 0){

1499

1064

timed out */

1500

1065

1501

1066

if(quit_now){

1502

avahi_s_service_resolver_free(r);

1503

1067

return;

1504

1068

}

1505

1069

1628

1192

errno = ret_errno;

1629

1193

return false;

1630

1194

}

1631

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

1632

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

1195

strcpy(ifr->ifr_name, ifname);

1633

1196

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1634

1197

if(ret == -1){

1635

1198

if(debug){

1772

1335

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

1773

1336

"abcdefghijklmnopqrstuvwxyz"

1774

1337

"0123456789"

1775

"_.-");

1338

"_-");

1776

1339

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

1777

1340

/* Contains non-allowed characters */

1778

1341

if(debug){

1782

1345

return 0;

1783

1346

}

1784

1347

1785

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);

1786

1356

if(ret == -1){

1787

1357

if(debug){

1788

1358

perror_plus("Could not stat hook");

1886

1456

}

1887

1457

}

1888

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

1889

1515

__attribute__((nonnull))

1890

1516

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

1891

1517

const float delay){

1892

struct dirent **direntries = NULL;

1893

if(hookdir_fd == -1){

1894

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1895

| O_CLOEXEC);

1896

if(hookdir_fd == -1){

1897

if(errno == ENOENT){

1898

if(debug){

1899

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

1900

" found\n", hookdir);

1901

}

1902

} else {

1903

perror_plus("open");

1904

}

1905

return;

1906

}

1907

}

1908

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

1909

runnable_hook, alphasort);

1518

struct dirent **direntries;

1519

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

1520

alphasort);

1910

1521

if(numhooks == -1){

1911

perror_plus("scandir");

1912

return;

1913

}

1914

struct dirent *direntry;

1915

int ret;

1916

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

1917

if(devnull == -1){

1918

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

1919

return;

1920

}

1921

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

1922

direntry = direntries[i];

1923

if(debug){

1924

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

1925

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");

1926

1529

}

1927

pid_t hook_pid = fork();

1928

if(hook_pid == 0){

1929

/* Child */

1930

/* Raise privileges */

1931

errno = raise_privileges_permanently();

1932

if(errno != 0){

1933

perror_plus("Failed to raise privileges");

1934

_exit(EX_NOPERM);

1935

}

1936

/* Set group */

1937

errno = 0;

1938

ret = setgid(0);

1939

if(ret == -1){

1940

perror_plus("setgid");

1941

_exit(EX_NOPERM);

1942

}

1943

/* Reset supplementary groups */

1944

errno = 0;

1945

ret = setgroups(0, NULL);

1946

if(ret == -1){

1947

perror_plus("setgroups");

1948

_exit(EX_NOPERM);

1949

}

1950

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

1951

if(ret == -1){

1952

perror_plus("setenv");

1953

_exit(EX_OSERR);

1954

}

1955

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

1956

if(ret == -1){

1957

perror_plus("setenv");

1958

_exit(EX_OSERR);

1959

}

1960

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

1961

if(ret == -1){

1962

perror_plus("setenv");

1963

_exit(EX_OSERR);

1964

}

1965

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

1966

if(ret == -1){

1967

perror_plus("setenv");

1968

_exit(EX_OSERR);

1969

}

1970

char *delaystring;

1971

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

1972

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){

1973

1539

perror_plus("asprintf");

1974

_exit(EX_OSERR);

1975

}

1976

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

1977

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

}

1978

1615

free(delaystring);

1979

perror_plus("setenv");

1980

_exit(EX_OSERR);

1981

}

1982

free(delaystring);

1983

if(connect_to != NULL){

1984

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

1985

if(ret == -1){

1986

perror_plus("setenv");

1987

_exit(EX_OSERR);

1988

}

1989

}

1990

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

1991

direntry->d_name,

1992

O_RDONLY));

1993

if(hook_fd == -1){

1994

perror_plus("openat");

1995

_exit(EXIT_FAILURE);

1996

}

1997

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

1998

perror_plus("close");

1999

_exit(EXIT_FAILURE);

2000

}

2001

ret = dup2(devnull, STDIN_FILENO);

2002

if(ret == -1){

2003

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

2004

_exit(EX_OSERR);

2005

}

2006

ret = close(devnull);

2007

if(ret == -1){

2008

perror_plus("close");

2009

_exit(EX_OSERR);

2010

}

2011

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2012

if(ret == -1){

2013

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

2014

_exit(EX_OSERR);

2015

}

2016

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

2017

environ) == -1){

2018

perror_plus("fexecve");

2019

_exit(EXIT_FAILURE);

2020

}

2021

} else {

2022

if(hook_pid == -1){

2023

perror_plus("fork");

2024

free(direntry);

2025

continue;

2026

}

2027

int status;

2028

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

2029

perror_plus("waitpid");

2030

free(direntry);

2031

continue;

2032

}

2033

if(WIFEXITED(status)){

2034

if(WEXITSTATUS(status) != 0){

2035

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

2036

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

2037

WEXITSTATUS(status));

2038

free(direntry);

2039

continue;

2040

}

2041

} else if(WIFSIGNALED(status)){

2042

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

2043

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

2044

WTERMSIG(status));

2045

free(direntry);

2046

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

}

2047

1627

} else {

2048

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

2049

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

2050

free(direntry);

2051

continue;

2052

}

2053

}

2054

if(debug){

2055

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

2056

direntry->d_name);

2057

}

2058

free(direntry);

2059

}

2060

free(direntries);

2061

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

2062

perror_plus("close");

2063

} else {

2064

hookdir_fd = -1;

2065

}

2066

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

}

2067

1663

}

2068

1664

2069

1665

__attribute__((nonnull, warn_unused_result))

2104

1700

}

2105

1701

2106

1702

if(quit_now){

2107

ret = close(sd);

1703

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

2108

1704

if(ret == -1){

2109

1705

perror_plus("close");

2110

1706

}

2120

1716

/* Raise privileges */

2121

1717

ret_errno = raise_privileges();

2122

1718

if(ret_errno != 0){

2123

errno = ret_errno;

2124

1719

perror_plus("Failed to raise privileges");

2125

1720

}

2126

1721

2160

1755

}

2161

1756

2162

1757

/* Close the socket */

2163

ret = close(sd);

1758

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

2164

1759

if(ret == -1){

2165

1760

perror_plus("close");

2166

1761

}

2230

1825

/* Raise privileges */

2231

1826

ret_errno = raise_privileges();

2232

1827

if(ret_errno != 0){

2233

errno = ret_errno;

2234

1828

perror_plus("Failed to raise privileges");

2235

1829

}

2236

1830

2248

1842

}

2249

1843

2250

1844

/* Close the socket */

2251

int ret = close(sd);

1845

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

2252

1846

if(ret == -1){

2253

1847

perror_plus("close");

2254

1848

}

2269

1863

}

2270

1864

2271

1865

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

2272

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

2273

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

2274

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

2275

.current_server = NULL, .interfaces = NULL,

2276

.interfaces_size = 0 };

1866

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

1867

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

1868

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

1869

.interfaces = NULL, .interfaces_size = 0 };

2277

1870

AvahiSServiceBrowser *sb = NULL;

2278

1871

error_t ret_errno;

2279

1872

int ret;

2288

1881

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2289

1882

const char *seckey = PATHDIR "/" SECKEY;

2290

1883

const char *pubkey = PATHDIR "/" PUBKEY;

2291

const char *dh_params_file = NULL;

2292

1884

char *interfaces_hooks = NULL;

2293

1885

2294

1886

bool gnutls_initialized = false;

2347

1939

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

2348

1940

" Diffie-Hellman key exchange",

2349

1941

.group = 2 },

2350

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

2351

.arg = "FILE",

2352

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

2353

" for the Diffie-Hellman key exchange",

2354

.group = 2 },

2355

1942

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

2356

1943

.arg = "STRING",

2357

1944

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

2412

1999

}

2413

2000

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

2414

2001

break;

2415

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

2416

dh_params_file = arg;

2417

break;

2418

2002

case 130: /* --priority */

2419

2003

mc.priority = arg;

2420

2004

break;

2476

2060

goto end;

2477

2061

}

2478

2062

}

2479

2063

2480

2064

{

2481

2065

/* Work around Debian bug #633582:

2482

2066

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

2506

2090

}

2507

2091

}

2508

2092

}

2509

close(seckey_fd);

2093

TEMP_FAILURE_RETRY(close(seckey_fd));

2510

2094

}

2511

2095

}

2512

2096

2513

2097

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

2514

2098

int pubkey_fd = open(pubkey, O_RDONLY);

2515

2099

if(pubkey_fd == -1){

2527

2111

}

2528

2112

}

2529

2113

}

2530

close(pubkey_fd);

2531

}

2532

}

2533

2534

if(dh_params_file != NULL

2535

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

2536

int dhparams_fd = open(dh_params_file, O_RDONLY);

2537

if(dhparams_fd == -1){

2538

perror_plus("open");

2539

} else {

2540

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

2541

if(ret == -1){

2542

perror_plus("fstat");

2543

} else {

2544

if(S_ISREG(st.st_mode)

2545

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

2546

ret = fchown(dhparams_fd, uid, gid);

2547

if(ret == -1){

2548

perror_plus("fchown");

2549

}

2550

}

2551

}

2552

close(dhparams_fd);

2553

}

2554

}

2555

2114

TEMP_FAILURE_RETRY(close(pubkey_fd));

2115

}

2116

}

2117

2556

2118

/* Lower privileges */

2557

2119

ret_errno = lower_privileges();

2558

2120

if(ret_errno != 0){

2675

2237

2676

2238

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

2677

2239

if(mc.interfaces == NULL){

2678

struct dirent **direntries = NULL;

2240

struct dirent **direntries;

2679

2241

/* Look for any good interfaces */

2680

2242

ret = scandir(sys_class_net, &direntries, good_interface,

2681

2243

alphasort);

2687

2249

if(ret_errno != 0){

2688

2250

errno = ret_errno;

2689

2251

perror_plus("argz_add");

2690

free(direntries[i]);

2691

2252

continue;

2692

2253

}

2693

2254

if(debug){

2694

2255

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

2695

2256

direntries[i]->d_name);

2696

2257

}

2697

free(direntries[i]);

2698

2258

}

2699

2259

free(direntries);

2700

2260

} else {

2701

if(ret == 0){

2702

free(direntries);

2703

}

2261

free(direntries);

2704

2262

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

2705

2263

exitcode = EXIT_FAILURE;

2706

2264

goto end;

2732

2290

errno = bring_up_interface(interface, delay);

2733

2291

if(not interface_was_up){

2734

2292

if(errno != 0){

2735

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

2736

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

2293

perror_plus("Failed to bring up interface");

2737

2294

} else {

2738

2295

errno = argz_add(&interfaces_to_take_down,

2739

2296

&interfaces_to_take_down_size,

2762

2319

goto end;

2763

2320

}

2764

2321

2765

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

2322

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

2766

2323

if(ret == -1){

2767

2324

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

2768

2325

exitcode = EX_UNAVAILABLE;

2929

2486

if(debug){

2930

2487

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

2931

2488

}

2932

2489

2933

2490

ret = avahi_loop_with_timeout(simple_poll,

2934

2491

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

2935

2492

if(debug){

2957

2514

2958

2515

if(gnutls_initialized){

2959

2516

gnutls_certificate_free_credentials(mc.cred);

2517

gnutls_global_deinit();

2960

2518

gnutls_dh_params_deinit(mc.dh_params);

2961

2519

}

2962

2520

2970

2528

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

2971

2529

while(mc.current_server != NULL){

2972

2530

server *next = mc.current_server->next;

2973

#ifdef __GNUC__

2974

#pragma GCC diagnostic push

2975

#pragma GCC diagnostic ignored "-Wcast-qual"

2976

#endif

2977

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

2978

#ifdef __GNUC__

2979

#pragma GCC diagnostic pop

2980

#endif

2981

2531

free(mc.current_server);

2982

2532

mc.current_server = next;

2983

2533

}

2987

2537

{

2988

2538

ret_errno = raise_privileges();

2989

2539

if(ret_errno != 0){

2990

errno = ret_errno;

2991

2540

perror_plus("Failed to raise privileges");

2992

2541

} else {

2993

2542

3016

2565

3017

2566

ret_errno = lower_privileges_permanently();

3018

2567

if(ret_errno != 0){

3019

errno = ret_errno;

3020

2568

perror_plus("Failed to lower privileges permanently");

3021

2569

}

3022

2570

}

3027

2575

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

3028

2576

if(tempdir != NULL){

3029

2577

struct dirent **direntries = NULL;

3030

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

3031

| O_NOFOLLOW

3032

| O_DIRECTORY

3033

| O_PATH));

3034

if(tempdir_fd == -1){

3035

perror_plus("open");

3036

} else {

3037

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

3038

notdotentries, alphasort);

3039

if(numentries >= 0){

3040

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

3041

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

3042

if(ret == -1){

3043

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

3044

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

3045

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

3046

}

3047

free(direntries[i]);

3048

}

3049

3050

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

3051

free(direntries);

3052

if(numentries == -1){

3053

perror_plus("scandir");

3054

}

3055

ret = rmdir(tempdir);

3056

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

3057

perror_plus("rmdir");

3058

}

2578

struct dirent *direntry = NULL;

2579

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

2580

alphasort);

2581

if(numentries > 0){

2582

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

2583

direntry = direntries[i];

2584

char *fullname = NULL;

2585

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

2586

direntry->d_name);

2587

if(ret < 0){

2588

perror_plus("asprintf");

2589

continue;

2590

}

2591

ret = remove(fullname);

2592

if(ret == -1){

2593

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

2594

strerror(errno));

2595

}

2596

free(fullname);

3059

2597

}

3060

close(tempdir_fd);

2598

}

2599

2600

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

2601

free(direntries);

2602

if(numentries == -1){

2603

perror_plus("scandir");

2604

}

2605

ret = rmdir(tempdir);

2606

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

2607

perror_plus("rmdir");

3061

2608

}

3062

2609

}

3063

2610