/mandos/release : revision 237.25.5

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() */

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(), AT_REMOVEDIR */

60

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

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, EINTR, EINVAL,

66

EAI_SYSTEM, ENETUNREACH,

67

EHOSTUNREACH, ECONNREFUSED, EPROTO,

68

EIO, ENOENT, ENXIO, ENOMEM, EISDIR,

69

ENOTEMPTY,

65

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

70

66

program_invocation_short_name */

71

67

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

72

68

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

309

305

return false;

310

306

}

311

307

312

ret = close(fd);

308

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

313

309

if(ret == -1){

314

310

perror_plus("close");

315

311

}

497

493

return plaintext_length;

498

494

}

499

495

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

507

496

__attribute__((warn_unused_result))

508

497

static const char *safer_gnutls_strerror(int value){

509

498

const char *ret = gnutls_strerror(value);

510

return safe_string(ret);

499

if(ret == NULL)

500

ret = "(unknown)";

501

return ret;

511

502

}

512

503

513

504

/* GnuTLS log function callback */

517

508

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

518

509

}

519

510

520

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

511

__attribute__((nonnull, warn_unused_result))

521

512

static int init_gnutls_global(const char *pubkeyfilename,

522

513

const char *seckeyfilename,

523

const char *dhparamsfilename,

524

514

mandos_context *mc){

525

515

int ret;

526

unsigned int uret;

527

516

528

517

if(debug){

529

518

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

530

519

}

531

520

521

ret = gnutls_global_init();

522

if(ret != GNUTLS_E_SUCCESS){

523

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

524

safer_gnutls_strerror(ret));

525

return -1;

526

}

527

532

528

if(debug){

533

529

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

534

530

* - GnuTLS manual

542

538

if(ret != GNUTLS_E_SUCCESS){

543

539

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

544

540

safer_gnutls_strerror(ret));

541

gnutls_global_deinit();

545

542

return -1;

546

543

}

547

544

572

569

safer_gnutls_strerror(ret));

573

570

goto globalfail;

574

571

}

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

}

572

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

573

if(ret != GNUTLS_E_SUCCESS){

574

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

575

safer_gnutls_strerror(ret));

576

goto globalfail;

577

}

578

747

579

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

748

580

749

581

return 0;

751

583

globalfail:

752

584

753

585

gnutls_certificate_free_credentials(mc->cred);

586

gnutls_global_deinit();

754

587

gnutls_dh_params_deinit(mc->dh_params);

755

588

return -1;

756

589

}

808

641

/* ignore client certificate if any. */

809

642

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

810

643

644

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

645

811

646

return 0;

812

647

}

813

648

817

652

818

653

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

819

654

__attribute__((warn_unused_result))

820

int raise_privileges(void){

821

int old_errno = errno;

822

int ret = 0;

655

error_t raise_privileges(void){

656

error_t old_errno = errno;

657

error_t ret_errno = 0;

823

658

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

824

ret = errno;

659

ret_errno = errno;

825

660

}

826

661

errno = old_errno;

827

return ret;

662

return ret_errno;

828

663

}

829

664

830

665

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

831

666

__attribute__((warn_unused_result))

832

int raise_privileges_permanently(void){

833

int old_errno = errno;

834

int ret = raise_privileges();

835

if(ret != 0){

667

error_t raise_privileges_permanently(void){

668

error_t old_errno = errno;

669

error_t ret_errno = raise_privileges();

670

if(ret_errno != 0){

836

671

errno = old_errno;

837

return ret;

672

return ret_errno;

838

673

}

839

674

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

840

ret = errno;

675

ret_errno = errno;

841

676

}

842

677

errno = old_errno;

843

return ret;

678

return ret_errno;

844

679

}

845

680

846

681

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

847

682

__attribute__((warn_unused_result))

848

int lower_privileges(void){

849

int old_errno = errno;

850

int ret = 0;

683

error_t lower_privileges(void){

684

error_t old_errno = errno;

685

error_t ret_errno = 0;

851

686

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

852

ret = errno;

687

ret_errno = errno;

853

688

}

854

689

errno = old_errno;

855

return ret;

690

return ret_errno;

856

691

}

857

692

858

693

/* Lower privileges permanently */

859

694

__attribute__((warn_unused_result))

860

int lower_privileges_permanently(void){

861

int old_errno = errno;

862

int ret = 0;

695

error_t lower_privileges_permanently(void){

696

error_t old_errno = errno;

697

error_t ret_errno = 0;

863

698

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

864

ret = errno;

699

ret_errno = errno;

865

700

}

866

701

errno = old_errno;

867

return ret;

702

return ret_errno;

868

703

}

869

704

870

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

705

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

871

706

__attribute__((nonnull, warn_unused_result))

872

static bool add_delete_local_route(const bool add,

707

static bool add_remove_local_route(const bool add,

873

708

const char *address,

874

709

AvahiIfIndex if_index){

875

710

int ret;

876

711

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

877

712

char add_arg[] = "add";

878

713

char delete_arg[] = "delete";

879

char debug_flag[] = "--debug";

880

714

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

881

715

if(pluginhelperdir == NULL){

882

716

if(debug){

926

760

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

927

761

_exit(EX_OSERR);

928

762

}

929

ret = close(devnull);

763

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

930

764

if(ret == -1){

931

765

perror_plus("close");

932

766

_exit(EX_OSERR);

949

783

helper, O_RDONLY));

950

784

if(helper_fd == -1){

951

785

perror_plus("openat");

952

close(helperdir_fd);

953

786

_exit(EX_UNAVAILABLE);

954

787

}

955

close(helperdir_fd);

788

TEMP_FAILURE_RETRY(close(helperdir_fd));

956

789

#ifdef __GNUC__

957

790

#pragma GCC diagnostic push

958

791

#pragma GCC diagnostic ignored "-Wcast-qual"

959

792

#endif

960

793

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

961

794

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

962

interface, debug ? debug_flag : NULL, NULL },

963

environ) == -1){

795

interface, NULL }, environ) == -1){

964

796

#ifdef __GNUC__

965

797

#pragma GCC diagnostic pop

966

798

#endif

1018

850

__attribute__((nonnull, warn_unused_result))

1019

851

static bool add_local_route(const char *address,

1020

852

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);

853

return add_remove_local_route(true, address, if_index);

1025

854

}

1026

855

1027

856

__attribute__((nonnull, warn_unused_result))

1028

static bool delete_local_route(const char *address,

857

static bool remove_local_route(const char *address,

1029

858

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);

859

return add_remove_local_route(false, address, if_index);

1034

860

}

1035

861

1036

862

/* Called when a Mandos server is found */

1126

952

goto mandos_end;

1127

953

}

1128

954

955

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

1129

956

if(af == AF_INET6){

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);

957

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

958

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

1133

959

} else { /* IPv4 */

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);

960

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

961

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

1137

962

}

1138

963

if(ret < 0 ){

1139

964

int e = errno;

1218

1043

sizeof(struct sockaddr_in));

1219

1044

}

1220

1045

if(ret < 0){

1221

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

1046

if(errno == ENETUNREACH

1222

1047

and if_index != AVAHI_IF_UNSPEC

1223

1048

and connect_to == NULL

1224

1049

and not route_added and

1240

1065

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

1241

1066

https://bugs.debian.org/587961

1242

1067

*/

1243

if(debug){

1244

fprintf_plus(stderr, "Mandos server unreachable, trying"

1245

" direct route\n");

1246

}

1247

1068

int e = errno;

1248

1069

route_added = add_local_route(ip, if_index);

1249

1070

if(route_added){

1453

1274

mandos_end:

1454

1275

{

1455

1276

if(route_added){

1456

if(not delete_local_route(ip, if_index)){

1457

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

1277

if(not remove_local_route(ip, if_index)){

1278

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

1458

1279

" interface %d", ip, if_index);

1459

1280

}

1460

1281

}

1462

1283

free(decrypted_buffer);

1463

1284

free(buffer);

1464

1285

if(tcp_sd >= 0){

1465

ret = close(tcp_sd);

1286

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

1466

1287

}

1467

1288

if(ret == -1){

1468

1289

if(e == 0){

1623

1444

__attribute__((nonnull, warn_unused_result))

1624

1445

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

1625

1446

int ret;

1626

int old_errno;

1447

error_t ret_errno;

1627

1448

1628

1449

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

1629

1450

if(s < 0){

1630

old_errno = errno;

1451

ret_errno = errno;

1631

1452

perror_plus("socket");

1632

errno = old_errno;

1453

errno = ret_errno;

1633

1454

return false;

1634

1455

}

1635

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

1636

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

1456

strcpy(ifr->ifr_name, ifname);

1637

1457

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1638

1458

if(ret == -1){

1639

1459

if(debug){

1640

old_errno = errno;

1460

ret_errno = errno;

1641

1461

perror_plus("ioctl SIOCGIFFLAGS");

1642

errno = old_errno;

1462

errno = ret_errno;

1643

1463

}

1644

1464

return false;

1645

1465

}

1909

1729

return;

1910

1730

}

1911

1731

}

1732

#ifdef __GLIBC__

1733

#if __GLIBC_PREREQ(2, 15)

1912

1734

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

1913

1735

runnable_hook, alphasort);

1736

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

1737

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

1738

alphasort);

1739

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

1740

#else /* not __GLIBC__ */

1741

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

1742

alphasort);

1743

#endif /* not __GLIBC__ */

1914

1744

if(numhooks == -1){

1915

1745

perror_plus("scandir");

1916

1746

return;

1998

1828

perror_plus("openat");

1999

1829

_exit(EXIT_FAILURE);

2000

1830

}

2001

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

1831

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

2002

1832

perror_plus("close");

2003

1833

_exit(EXIT_FAILURE);

2004

1834

}

2007

1837

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

2008

1838

_exit(EX_OSERR);

2009

1839

}

2010

ret = close(devnull);

1840

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

2011

1841

if(ret == -1){

2012

1842

perror_plus("close");

2013

1843

_exit(EX_OSERR);

2062

1892

free(direntry);

2063

1893

}

2064

1894

free(direntries);

2065

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

1895

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

2066

1896

perror_plus("close");

2067

1897

} else {

2068

1898

hookdir_fd = -1;

2071

1901

}

2072

1902

2073

1903

__attribute__((nonnull, warn_unused_result))

2074

int bring_up_interface(const char *const interface,

2075

const float delay){

2076

int old_errno = errno;

1904

error_t bring_up_interface(const char *const interface,

1905

const float delay){

1906

error_t old_errno = errno;

2077

1907

int ret;

2078

1908

struct ifreq network;

2079

1909

unsigned int if_index = if_nametoindex(interface);

2089

1919

}

2090

1920

2091

1921

if(not interface_is_up(interface)){

2092

int ret_errno = 0;

2093

int ioctl_errno = 0;

1922

error_t ret_errno = 0, ioctl_errno = 0;

2094

1923

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

2095

1924

ret_errno = errno;

2096

1925

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

2109

1938

}

2110

1939

2111

1940

if(quit_now){

2112

ret = close(sd);

1941

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

2113

1942

if(ret == -1){

2114

1943

perror_plus("close");

2115

1944

}

2165

1994

}

2166

1995

2167

1996

/* Close the socket */

2168

ret = close(sd);

1997

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

2169

1998

if(ret == -1){

2170

1999

perror_plus("close");

2171

2000

}

2199

2028

}

2200

2029

2201

2030

__attribute__((nonnull, warn_unused_result))

2202

int take_down_interface(const char *const interface){

2203

int old_errno = errno;

2031

error_t take_down_interface(const char *const interface){

2032

error_t old_errno = errno;

2204

2033

struct ifreq network;

2205

2034

unsigned int if_index = if_nametoindex(interface);

2206

2035

if(if_index == 0){

2209

2038

return ENXIO;

2210

2039

}

2211

2040

if(interface_is_up(interface)){

2212

int ret_errno = 0;

2213

int ioctl_errno = 0;

2041

error_t ret_errno = 0, ioctl_errno = 0;

2214

2042

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

2215

2043

ret_errno = errno;

2216

2044

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

2254

2082

}

2255

2083

2256

2084

/* Close the socket */

2257

int ret = close(sd);

2085

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

2258

2086

if(ret == -1){

2259

2087

perror_plus("close");

2260

2088

}

2275

2103

}

2276

2104

2277

2105

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

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 };

2106

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

2107

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

2108

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

2109

.interfaces = NULL, .interfaces_size = 0 };

2283

2110

AvahiSServiceBrowser *sb = NULL;

2284

2111

error_t ret_errno;

2285

2112

int ret;

2294

2121

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2295

2122

const char *seckey = PATHDIR "/" SECKEY;

2296

2123

const char *pubkey = PATHDIR "/" PUBKEY;

2297

const char *dh_params_file = NULL;

2298

2124

char *interfaces_hooks = NULL;

2299

2125

2300

2126

bool gnutls_initialized = false;

2353

2179

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

2354

2180

" Diffie-Hellman key exchange",

2355

2181

.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 },

2361

2182

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

2362

2183

.arg = "STRING",

2363

2184

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

2418

2239

}

2419

2240

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

2420

2241

break;

2421

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

2422

dh_params_file = arg;

2423

break;

2424

2242

case 130: /* --priority */

2425

2243

mc.priority = arg;

2426

2244

break;

2466

2284

.args_doc = "",

2467

2285

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

2468

2286

" passwords from a Mandos server" };

2469

ret_errno = argp_parse(&argp, argc, argv,

2470

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2471

switch(ret_errno){

2287

ret = argp_parse(&argp, argc, argv,

2288

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2289

switch(ret){

2472

2290

case 0:

2473

2291

break;

2474

2292

case ENOMEM:

2475

2293

default:

2476

errno = ret_errno;

2294

errno = ret;

2477

2295

perror_plus("argp_parse");

2478

2296

exitcode = EX_OSERR;

2479

2297

goto end;

2488

2306

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

2489

2307

2490

2308

/* Re-raise privileges */

2491

ret = raise_privileges();

2492

if(ret != 0){

2493

errno = ret;

2309

ret_errno = raise_privileges();

2310

if(ret_errno != 0){

2311

errno = ret_errno;

2494

2312

perror_plus("Failed to raise privileges");

2495

2313

} else {

2496

2314

struct stat st;

2512

2330

}

2513

2331

}

2514

2332

}

2515

close(seckey_fd);

2333

TEMP_FAILURE_RETRY(close(seckey_fd));

2516

2334

}

2517

2335

}

2518

2336

2533

2351

}

2534

2352

}

2535

2353

}

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);

2354

TEMP_FAILURE_RETRY(close(pubkey_fd));

2559

2355

}

2560

2356

}

2561

2357

2562

2358

/* Lower privileges */

2563

ret = lower_privileges();

2564

if(ret != 0){

2565

errno = ret;

2359

ret_errno = lower_privileges();

2360

if(ret_errno != 0){

2361

errno = ret_errno;

2566

2362

perror_plus("Failed to lower privileges");

2567

2363

}

2568

2364

}

2738

2534

errno = bring_up_interface(interface, delay);

2739

2535

if(not interface_was_up){

2740

2536

if(errno != 0){

2741

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

2742

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

2537

perror_plus("Failed to bring up interface");

2743

2538

} else {

2744

2539

errno = argz_add(&interfaces_to_take_down,

2745

2540

&interfaces_to_take_down_size,

2768

2563

goto end;

2769

2564

}

2770

2565

2771

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

2566

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

2772

2567

if(ret == -1){

2773

2568

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

2774

2569

exitcode = EX_UNAVAILABLE;

2896

2691

2897

2692

/* Allocate a new server */

2898

2693

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2899

&config, NULL, NULL, &ret);

2694

&config, NULL, NULL, &ret_errno);

2900

2695

2901

2696

/* Free the Avahi configuration data */

2902

2697

avahi_server_config_free(&config);

2905

2700

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

2906

2701

if(mc.server == NULL){

2907

2702

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

2908

avahi_strerror(ret));

2703

avahi_strerror(ret_errno));

2909

2704

exitcode = EX_UNAVAILABLE;

2910

2705

goto end;

2911

2706

}

2963

2758

2964

2759

if(gnutls_initialized){

2965

2760

gnutls_certificate_free_credentials(mc.cred);

2761

gnutls_global_deinit();

2966

2762

gnutls_dh_params_deinit(mc.dh_params);

2967

2763

}

2968

2764

2991

2787

2992

2788

/* Re-raise privileges */

2993

2789

{

2994

ret = raise_privileges();

2995

if(ret != 0){

2996

errno = ret;

2790

ret_errno = raise_privileges();

2791

if(ret_errno != 0){

2792

errno = ret_errno;

2997

2793

perror_plus("Failed to raise privileges");

2998

2794

} else {

2999

2795

3007

2803

while((interface=argz_next(interfaces_to_take_down,

3008

2804

interfaces_to_take_down_size,

3009

2805

interface))){

3010

ret = take_down_interface(interface);

3011

if(ret != 0){

3012

errno = ret;

2806

ret_errno = take_down_interface(interface);

2807

if(ret_errno != 0){

2808

errno = ret_errno;

3013

2809

perror_plus("Failed to take down interface");

3014

2810

}

3015

2811

}

3020

2816

}

3021

2817

}

3022

2818

3023

ret = lower_privileges_permanently();

3024

if(ret != 0){

3025

errno = ret;

2819

ret_errno = lower_privileges_permanently();

2820

if(ret_errno != 0){

2821

errno = ret_errno;

3026

2822

perror_plus("Failed to lower privileges permanently");

3027

2823

}

3028

2824

}

3030

2826

free(interfaces_to_take_down);

3031

2827

free(interfaces_hooks);

3032

2828

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

3089

2829

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

3090

2830

if(tempdir != NULL){

3091

clean_dir_at(-1, tempdir, 0);

2831

struct dirent **direntries = NULL;

2832

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

2833

| O_NOFOLLOW

2834

| O_DIRECTORY

2835

| O_PATH));

2836

if(tempdir_fd == -1){

2837

perror_plus("open");

2838

} else {

2839

#ifdef __GLIBC__

2840

#if __GLIBC_PREREQ(2, 15)

2841

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

2842

notdotentries, alphasort);

2843

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

2844

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

2845

alphasort);

2846

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

2847

#else /* not __GLIBC__ */

2848

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

2849

alphasort);

2850

#endif /* not __GLIBC__ */

2851

if(numentries >= 0){

2852

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

2853

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

2854

if(ret == -1){

2855

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

2856

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

2857

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

2858

}

2859

free(direntries[i]);

2860

}

2861

2862

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

2863

free(direntries);

2864

if(numentries == -1){

2865

perror_plus("scandir");

2866

}

2867

ret = rmdir(tempdir);

2868

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

2869

perror_plus("rmdir");

2870

}

2871

}

2872

TEMP_FAILURE_RETRY(close(tempdir_fd));

2873

}

3092

2874

}

3093

2875

3094

2876

if(quit_now){