/mandos/trunk : revision 743

9

* "browse_callback", and parts of "main".

10

*

11

* Everything else is

12

13

12

13

14

*

15

* This program is free software: you can redistribute it and/or

16

* modify it under the terms of the GNU General Public License as

46

#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),

47

strtof(), abort() */

48

#include <stdbool.h> /* bool, false, true */

49

#include <string.h> /* 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

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inet_pton(), connect(),

60

59

getnameinfo() */

61

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

60

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

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,

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EAI_SYSTEM, ENETUNREACH,

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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,

310

305

return false;

311

306

}

312

307

313

ret = close(fd);

308

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

314

309

if(ret == -1){

315

310

perror_plus("close");

316

311

}

518

513

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

519

514

}

520

515

521

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

516

__attribute__((nonnull, warn_unused_result))

522

517

static int init_gnutls_global(const char *pubkeyfilename,

523

518

const char *seckeyfilename,

524

const char *dhparamsfilename,

525

519

mandos_context *mc){

526

520

int ret;

527

521

unsigned int uret;

530

524

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

531

525

}

532

526

527

ret = gnutls_global_init();

528

if(ret != GNUTLS_E_SUCCESS){

529

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

530

safer_gnutls_strerror(ret));

531

return -1;

532

}

533

534

if(debug){

534

535

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

535

536

* - GnuTLS manual

543

544

if(ret != GNUTLS_E_SUCCESS){

544

545

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

545

546

safer_gnutls_strerror(ret));

547

gnutls_global_deinit();

546

548

return -1;

547

549

}

548

550

573

575

safer_gnutls_strerror(ret));

574

576

goto globalfail;

575

577

}

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;

578

if(mc->dh_bits == 0){

579

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

580

/* Try to read the private key file */

581

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

582

{

583

int secfile = open(seckeyfilename, O_RDONLY);

584

size_t buffer_capacity = 0;

587

585

while(true){

588

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

589

(size_t)params.size,

590

(size_t)params_capacity);

591

if(params_capacity == 0){

586

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

587

(size_t)buffer.size,

588

(size_t)buffer_capacity);

589

if(buffer_capacity == 0){

592

590

perror_plus("incbuffer");

593

free(params.data);

594

params.data = NULL;

595

dhparamsfilename = NULL;

591

free(buffer.data);

592

buffer.data = NULL;

596

593

break;

597

594

}

598

ssize_t bytes_read = read(dhpfile,

599

params.data + params.size,

595

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

600

596

BUFFER_SIZE);

601

597

/* EOF */

602

598

if(bytes_read == 0){

605

601

/* check bytes_read for failure */

606

602

if(bytes_read < 0){

607

603

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);

604

free(buffer.data);

605

buffer.data = NULL;

606

break;

607

}

608

buffer.size += (unsigned int)bytes_read;

609

}

610

close(secfile);

611

}

612

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

613

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

614

if(buffer.data != NULL){

615

{

616

gnutls_openpgp_privkey_t privkey = NULL;

617

ret = gnutls_openpgp_privkey_init(&privkey);

618

if(ret != GNUTLS_E_SUCCESS){

619

fprintf_plus(stderr, "Error initializing OpenPGP key"

620

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

621

free(buffer.data);

622

buffer.data = NULL;

623

} else {

624

ret = gnutls_openpgp_privkey_import(privkey, &buffer,

625

GNUTLS_OPENPGP_FMT_BASE64,

626

"", 0);

677

627

if(ret != GNUTLS_E_SUCCESS){

678

fprintf_plus(stderr, "Error initializing OpenPGP key"

679

" structure: %s",

628

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

680

629

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

}

630

privkey = NULL;

705

631

}

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)));

632

free(buffer.data);

633

buffer.data = NULL;

634

if(privkey != NULL){

635

/* Use private key to suggest an appropriate sec_param */

636

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

637

gnutls_openpgp_privkey_deinit(privkey);

638

if(debug){

639

fprintf_plus(stderr, "This OpenPGP key implies using a"

640

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

641

safe_string(gnutls_sec_param_get_name

642

(sec_param)));

643

}

715

644

}

716

645

}

717

646

}

718

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

719

if(uret != 0){

720

mc->dh_bits = uret;

647

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

648

/* Err on the side of caution */

649

sec_param = GNUTLS_SEC_PARAM_ULTRA;

721

650

if(debug){

722

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

723

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

651

fprintf_plus(stderr, "Falling back to security parameter"

652

" \"%s\"\n",

724

653

safe_string(gnutls_sec_param_get_name

725

(sec_param)),

726

mc->dh_bits);

654

(sec_param)));

727

655

}

728

} else {

729

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

730

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

656

}

657

}

658

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

659

if(uret != 0){

660

mc->dh_bits = uret;

661

if(debug){

662

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

663

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

731

664

safe_string(gnutls_sec_param_get_name

732

665

(sec_param)),

733

safer_gnutls_strerror(ret));

734

goto globalfail;

666

mc->dh_bits);

735

667

}

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,

668

} else {

669

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

670

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

671

safe_string(gnutls_sec_param_get_name(sec_param)),

744

672

safer_gnutls_strerror(ret));

745

673

goto globalfail;

746

674

}

747

}

675

} else if(debug){

676

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

677

mc->dh_bits);

678

}

679

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

680

if(ret != GNUTLS_E_SUCCESS){

681

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

682

" %s\n", mc->dh_bits, safer_gnutls_strerror(ret));

683

goto globalfail;

684

}

685

748

686

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

749

687

750

688

return 0;

752

690

globalfail:

753

691

754

692

gnutls_certificate_free_credentials(mc->cred);

693

gnutls_global_deinit();

755

694

gnutls_dh_params_deinit(mc->dh_params);

756

695

return -1;

757

696

}

809

748

/* ignore client certificate if any. */

810

749

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

811

750

751

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

752

812

753

return 0;

813

754

}

814

755

816

757

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

817

758

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

818

759

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

760

/* Called when a Mandos server is found */

1038

761

__attribute__((nonnull, warn_unused_result))

1039

762

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

1050

773

int retval = -1;

1051

774

gnutls_session_t session;

1052

775

int pf; /* Protocol family */

1053

bool route_added = false;

1054

776

1055

777

errno = 0;

1056

778

1114

836

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

1115

837

}

1116

838

1117

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

839

tcp_sd = socket(pf, SOCK_STREAM, 0);

1118

840

if(tcp_sd < 0){

1119

841

int e = errno;

1120

842

perror_plus("socket");

1127

849

goto mandos_end;

1128

850

}

1129

851

852

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

1130

853

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);

854

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

855

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

1134

856

} 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);

857

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

858

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

1138

859

}

1139

860

if(ret < 0 ){

1140

861

int e = errno;

1210

931

goto mandos_end;

1211

932

}

1212

933

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;

934

if(af == AF_INET6){

935

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

936

sizeof(struct sockaddr_in6));

937

} else {

938

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

939

sizeof(struct sockaddr_in));

940

}

941

if(ret < 0){

942

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

943

int e = errno;

944

perror_plus("connect");

945

errno = e;

946

}

947

goto mandos_end;

948

}

949

950

if(quit_now){

951

errno = EINTR;

952

goto mandos_end;

1268

953

}

1269

954

1270

955

const char *out = mandos_protocol_version;

1424

1109

&decrypted_buffer, mc);

1425

1110

if(decrypted_buffer_size >= 0){

1426

1111

1427

clearerr(stdout);

1428

1112

written = 0;

1429

1113

while(written < (size_t) decrypted_buffer_size){

1430

1114

if(quit_now){

1446

1130

}

1447

1131

written += (size_t)ret;

1448

1132

}

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

1133

retval = 0;

1460

1134

}

1461

1135

}

1464

1138

1465

1139

mandos_end:

1466

1140

{

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

1141

int e = errno;

1474

1142

free(decrypted_buffer);

1475

1143

free(buffer);

1476

1144

if(tcp_sd >= 0){

1477

ret = close(tcp_sd);

1145

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

1478

1146

}

1479

1147

if(ret == -1){

1480

1148

if(e == 0){

1635

1303

__attribute__((nonnull, warn_unused_result))

1636

1304

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

1637

1305

int ret;

1638

int old_errno;

1306

error_t ret_errno;

1639

1307

1640

1308

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

1641

1309

if(s < 0){

1642

old_errno = errno;

1310

ret_errno = errno;

1643

1311

perror_plus("socket");

1644

errno = old_errno;

1312

errno = ret_errno;

1645

1313

return false;

1646

1314

}

1647

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

1648

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

1315

strcpy(ifr->ifr_name, ifname);

1649

1316

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1650

1317

if(ret == -1){

1651

1318

if(debug){

1652

old_errno = errno;

1319

ret_errno = errno;

1653

1320

perror_plus("ioctl SIOCGIFFLAGS");

1654

errno = old_errno;

1321

errno = ret_errno;

1655

1322

}

1656

1323

return false;

1657

1324

}

1902

1569

}

1903

1570

}

1904

1571

1572

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

1573

__attribute__((warn_unused_result))

1574

error_t raise_privileges(void){

1575

error_t old_errno = errno;

1576

error_t ret_errno = 0;

1577

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

1578

ret_errno = errno;

1579

}

1580

errno = old_errno;

1581

return ret_errno;

1582

}

1583

1584

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

1585

__attribute__((warn_unused_result))

1586

error_t raise_privileges_permanently(void){

1587

error_t old_errno = errno;

1588

error_t ret_errno = raise_privileges();

1589

if(ret_errno != 0){

1590

errno = old_errno;

1591

return ret_errno;

1592

}

1593

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

1594

ret_errno = errno;

1595

}

1596

errno = old_errno;

1597

return ret_errno;

1598

}

1599

1600

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

1601

__attribute__((warn_unused_result))

1602

error_t lower_privileges(void){

1603

error_t old_errno = errno;

1604

error_t ret_errno = 0;

1605

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

1606

ret_errno = errno;

1607

}

1608

errno = old_errno;

1609

return ret_errno;

1610

}

1611

1612

/* Lower privileges permanently */

1613

__attribute__((warn_unused_result))

1614

error_t lower_privileges_permanently(void){

1615

error_t old_errno = errno;

1616

error_t ret_errno = 0;

1617

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

1618

ret_errno = errno;

1619

}

1620

errno = old_errno;

1621

return ret_errno;

1622

}

1623

1905

1624

__attribute__((nonnull))

1906

1625

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

1907

1626

const float delay){

1908

1627

struct dirent **direntries = NULL;

1909

1628

if(hookdir_fd == -1){

1910

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1911

| O_CLOEXEC);

1629

hookdir_fd = open(hookdir, O_RDONLY);

1912

1630

if(hookdir_fd == -1){

1913

1631

if(errno == ENOENT){

1914

1632

if(debug){

1921

1639

return;

1922

1640

}

1923

1641

}

1642

#ifdef __GLIBC__

1643

#if __GLIBC_PREREQ(2, 15)

1924

1644

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

1925

1645

runnable_hook, alphasort);

1646

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

1647

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

1648

alphasort);

1649

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

1650

#else /* not __GLIBC__ */

1651

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

1652

alphasort);

1653

#endif /* not __GLIBC__ */

1926

1654

if(numhooks == -1){

1927

1655

perror_plus("scandir");

1928

1656

return;

1929

1657

}

1930

1658

struct dirent *direntry;

1931

1659

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

}

1660

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

1937

1661

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

1938

1662

direntry = direntries[i];

1939

1663

if(debug){

1963

1687

perror_plus("setgroups");

1964

1688

_exit(EX_NOPERM);

1965

1689

}

1690

ret = dup2(devnull, STDIN_FILENO);

1691

if(ret == -1){

1692

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

1693

_exit(EX_OSERR);

1694

}

1695

ret = close(devnull);

1696

if(ret == -1){

1697

perror_plus("close");

1698

_exit(EX_OSERR);

1699

}

1700

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1701

if(ret == -1){

1702

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

1703

_exit(EX_OSERR);

1704

}

1966

1705

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

1967

1706

if(ret == -1){

1968

1707

perror_plus("setenv");

2003

1742

_exit(EX_OSERR);

2004

1743

}

2005

1744

}

2006

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

2007

direntry->d_name,

2008

O_RDONLY));

1745

int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);

2009

1746

if(hook_fd == -1){

2010

1747

perror_plus("openat");

2011

1748

_exit(EXIT_FAILURE);

2012

1749

}

2013

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

1750

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

2014

1751

perror_plus("close");

2015

1752

_exit(EXIT_FAILURE);

2016

1753

}

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

1754

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

2033

1755

environ) == -1){

2034

1756

perror_plus("fexecve");

2074

1796

free(direntry);

2075

1797

}

2076

1798

free(direntries);

2077

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

1799

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

2078

1800

perror_plus("close");

2079

1801

} else {

2080

1802

hookdir_fd = -1;

2083

1805

}

2084

1806

2085

1807

__attribute__((nonnull, warn_unused_result))

2086

int bring_up_interface(const char *const interface,

2087

const float delay){

2088

int old_errno = errno;

1808

error_t bring_up_interface(const char *const interface,

1809

const float delay){

1810

error_t old_errno = errno;

2089

1811

int ret;

2090

1812

struct ifreq network;

2091

1813

unsigned int if_index = if_nametoindex(interface);

2101

1823

}

2102

1824

2103

1825

if(not interface_is_up(interface)){

2104

int ret_errno = 0;

2105

int ioctl_errno = 0;

1826

error_t ret_errno = 0, ioctl_errno = 0;

2106

1827

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

2107

1828

ret_errno = errno;

2108

1829

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

2121

1842

}

2122

1843

2123

1844

if(quit_now){

2124

ret = close(sd);

1845

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

2125

1846

if(ret == -1){

2126

1847

perror_plus("close");

2127

1848

}

2177

1898

}

2178

1899

2179

1900

/* Close the socket */

2180

ret = close(sd);

1901

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

2181

1902

if(ret == -1){

2182

1903

perror_plus("close");

2183

1904

}

2211

1932

}

2212

1933

2213

1934

__attribute__((nonnull, warn_unused_result))

2214

int take_down_interface(const char *const interface){

2215

int old_errno = errno;

1935

error_t take_down_interface(const char *const interface){

1936

error_t old_errno = errno;

2216

1937

struct ifreq network;

2217

1938

unsigned int if_index = if_nametoindex(interface);

2218

1939

if(if_index == 0){

2221

1942

return ENXIO;

2222

1943

}

2223

1944

if(interface_is_up(interface)){

2224

int ret_errno = 0;

2225

int ioctl_errno = 0;

1945

error_t ret_errno = 0, ioctl_errno = 0;

2226

1946

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

2227

1947

ret_errno = errno;

2228

1948

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

2266

1986

}

2267

1987

2268

1988

/* Close the socket */

2269

int ret = close(sd);

1989

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

2270

1990

if(ret == -1){

2271

1991

perror_plus("close");

2272

1992

}

2288

2008

2289

2009

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

2290

2010

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 };

2011

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

2012

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

2013

.interfaces = NULL, .interfaces_size = 0 };

2295

2014

AvahiSServiceBrowser *sb = NULL;

2296

2015

error_t ret_errno;

2297

2016

int ret;

2306

2025

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2307

2026

const char *seckey = PATHDIR "/" SECKEY;

2308

2027

const char *pubkey = PATHDIR "/" PUBKEY;

2309

const char *dh_params_file = NULL;

2310

2028

char *interfaces_hooks = NULL;

2311

2029

2312

2030

bool gnutls_initialized = false;

2365

2083

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

2366

2084

" Diffie-Hellman key exchange",

2367

2085

.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

2086

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

2374

2087

.arg = "STRING",

2375

2088

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

2430

2143

}

2431

2144

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

2432

2145

break;

2433

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

2434

dh_params_file = arg;

2435

break;

2436

2146

case 130: /* --priority */

2437

2147

mc.priority = arg;

2438

2148

break;

2478

2188

.args_doc = "",

2479

2189

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

2480

2190

" 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){

2191

ret = argp_parse(&argp, argc, argv,

2192

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2193

switch(ret){

2484

2194

case 0:

2485

2195

break;

2486

2196

case ENOMEM:

2487

2197

default:

2488

errno = ret_errno;

2198

errno = ret;

2489

2199

perror_plus("argp_parse");

2490

2200

exitcode = EX_OSERR;

2491

2201

goto end;

2494

2204

goto end;

2495

2205

}

2496

2206

}

2497

2207

2498

2208

{

2499

2209

/* Work around Debian bug #633582:

2500

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

2210

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

2501

2211

2502

2212

/* Re-raise privileges */

2503

ret = raise_privileges();

2504

if(ret != 0){

2505

errno = ret;

2213

ret_errno = raise_privileges();

2214

if(ret_errno != 0){

2215

errno = ret_errno;

2506

2216

perror_plus("Failed to raise privileges");

2507

2217

} else {

2508

2218

struct stat st;

2524

2234

}

2525

2235

}

2526

2236

}

2527

close(seckey_fd);

2237

TEMP_FAILURE_RETRY(close(seckey_fd));

2528

2238

}

2529

2239

}

2530

2240

2531

2241

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

2532

2242

int pubkey_fd = open(pubkey, O_RDONLY);

2533

2243

if(pubkey_fd == -1){

2545

2255

}

2546

2256

}

2547

2257

}

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

2258

TEMP_FAILURE_RETRY(close(pubkey_fd));

2259

}

2260

}

2261

2574

2262

/* Lower privileges */

2575

ret = lower_privileges();

2576

if(ret != 0){

2577

errno = ret;

2263

ret_errno = lower_privileges();

2264

if(ret_errno != 0){

2265

errno = ret_errno;

2578

2266

perror_plus("Failed to lower privileges");

2579

2267

}

2580

2268

}

2750

2438

errno = bring_up_interface(interface, delay);

2751

2439

if(not interface_was_up){

2752

2440

if(errno != 0){

2753

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

2754

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

2441

perror_plus("Failed to bring up interface");

2755

2442

} else {

2756

2443

errno = argz_add(&interfaces_to_take_down,

2757

2444

&interfaces_to_take_down_size,

2780

2467

goto end;

2781

2468

}

2782

2469

2783

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

2470

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

2784

2471

if(ret == -1){

2785

2472

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

2786

2473

exitcode = EX_UNAVAILABLE;

2908

2595

2909

2596

/* Allocate a new server */

2910

2597

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2911

&config, NULL, NULL, &ret);

2598

&config, NULL, NULL, &ret_errno);

2912

2599

2913

2600

/* Free the Avahi configuration data */

2914

2601

avahi_server_config_free(&config);

2917

2604

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

2918

2605

if(mc.server == NULL){

2919

2606

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

2920

avahi_strerror(ret));

2607

avahi_strerror(ret_errno));

2921

2608

exitcode = EX_UNAVAILABLE;

2922

2609

goto end;

2923

2610

}

2958

2645

end:

2959

2646

2960

2647

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

}

2648

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

2968

2649

}

2969

2650

2970

2651

/* Cleanup things */

2981

2662

2982

2663

if(gnutls_initialized){

2983

2664

gnutls_certificate_free_credentials(mc.cred);

2665

gnutls_global_deinit();

2984

2666

gnutls_dh_params_deinit(mc.dh_params);

2985

2667

}

2986

2668

3009

2691

3010

2692

/* Re-raise privileges */

3011

2693

{

3012

ret = raise_privileges();

3013

if(ret != 0){

3014

errno = ret;

2694

ret_errno = raise_privileges();

2695

if(ret_errno != 0){

2696

errno = ret_errno;

3015

2697

perror_plus("Failed to raise privileges");

3016

2698

} else {

3017

2699

3025

2707

while((interface=argz_next(interfaces_to_take_down,

3026

2708

interfaces_to_take_down_size,

3027

2709

interface))){

3028

ret = take_down_interface(interface);

3029

if(ret != 0){

3030

errno = ret;

2710

ret_errno = take_down_interface(interface);

2711

if(ret_errno != 0){

2712

errno = ret_errno;

3031

2713

perror_plus("Failed to take down interface");

3032

2714

}

3033

2715

}

3038

2720

}

3039

2721

}

3040

2722

3041

ret = lower_privileges_permanently();

3042

if(ret != 0){

3043

errno = ret;

2723

ret_errno = lower_privileges_permanently();

2724

if(ret_errno != 0){

2725

errno = ret_errno;

3044

2726

perror_plus("Failed to lower privileges permanently");

3045

2727

}

3046

2728

}

3048

2730

free(interfaces_to_take_down);

3049

2731

free(interfaces_hooks);

3050

2732

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

2733

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

3108

2734

if(tempdir != NULL){

3109

clean_dir_at(-1, tempdir, 0);

2735

struct dirent **direntries = NULL;

2736

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

2737

O_NOFOLLOW));

2738

if(tempdir_fd == -1){

2739

perror_plus("open");

2740

} else {

2741

#ifdef __GLIBC__

2742

#if __GLIBC_PREREQ(2, 15)

2743

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

2744

notdotentries, alphasort);

2745

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

2746

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

2747

alphasort);

2748

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

2749

#else /* not __GLIBC__ */

2750

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

2751

alphasort);

2752

#endif /* not __GLIBC__ */

2753

if(numentries >= 0){

2754

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

2755

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

2756

if(ret == -1){

2757

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

2758

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

2759

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

2760

}

2761

free(direntries[i]);

2762

}

2763

2764

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

2765

free(direntries);

2766

if(numentries == -1){

2767

perror_plus("scandir");

2768

}

2769

ret = rmdir(tempdir);

2770

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

2771

perror_plus("rmdir");

2772

}

2773

}

2774

TEMP_FAILURE_RETRY(close(tempdir_fd));

2775

}

3110

2776

}

3111

2777

3112

2778

if(quit_now){