/mandos/trunk : revision 835

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

50

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

49

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

50

asprintf(), strncpy() */

51

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

52

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

53

sockaddr_in6, PF_INET6,

57

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

58

inet_pton(), connect(),

59

getnameinfo() */

60

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

60

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

61

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

62

*/

63

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

64

strtoimax() */

65

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

65

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

66

EAI_SYSTEM, ENETUNREACH,

67

EHOSTUNREACH, ECONNREFUSED, EPROTO,

68

EIO, ENOENT, ENXIO, ENOMEM, EISDIR,

69

ENOTEMPTY,

66

70

program_invocation_short_name */

67

71

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

68

72

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

305

309

return false;

306

310

}

307

311

308

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

312

ret = close(fd);

309

313

if(ret == -1){

310

314

perror_plus("close");

311

315

}

493

497

return plaintext_length;

494

498

}

495

499

500

__attribute__((warn_unused_result, const))

501

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

502

if(str == NULL)

503

return "(unknown)";

504

return str;

505

}

506

496

507

__attribute__((warn_unused_result))

497

508

static const char *safer_gnutls_strerror(int value){

498

509

const char *ret = gnutls_strerror(value);

499

if(ret == NULL)

500

ret = "(unknown)";

501

return ret;

510

return safe_string(ret);

502

511

}

503

512

504

513

/* GnuTLS log function callback */

508

517

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

509

518

}

510

519

511

__attribute__((nonnull, warn_unused_result))

520

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

512

521

static int init_gnutls_global(const char *pubkeyfilename,

513

522

const char *seckeyfilename,

523

const char *dhparamsfilename,

514

524

mandos_context *mc){

515

525

int ret;

526

unsigned int uret;

516

527

517

528

if(debug){

518

529

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

519

530

}

520

531

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

528

532

if(debug){

529

533

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

530

534

* - GnuTLS manual

538

542

if(ret != GNUTLS_E_SUCCESS){

539

543

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

540

544

safer_gnutls_strerror(ret));

541

gnutls_global_deinit();

542

545

return -1;

543

546

}

544

547

569

572

safer_gnutls_strerror(ret));

570

573

goto globalfail;

571

574

}

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

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

}

579

747

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

580

748

581

749

return 0;

583

751

globalfail:

584

752

585

753

gnutls_certificate_free_credentials(mc->cred);

586

gnutls_global_deinit();

587

754

gnutls_dh_params_deinit(mc->dh_params);

588

755

return -1;

589

756

}

641

808

/* ignore client certificate if any. */

642

809

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

643

810

644

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

645

646

811

return 0;

647

812

}

648

813

652

817

653

818

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

654

819

__attribute__((warn_unused_result))

655

error_t raise_privileges(void){

656

error_t old_errno = errno;

657

error_t ret_errno = 0;

820

int raise_privileges(void){

821

int old_errno = errno;

822

int ret = 0;

658

823

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

659

ret_errno = errno;

824

ret = errno;

660

825

}

661

826

errno = old_errno;

662

return ret_errno;

827

return ret;

663

828

}

664

829

665

830

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

666

831

__attribute__((warn_unused_result))

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){

832

int raise_privileges_permanently(void){

833

int old_errno = errno;

834

int ret = raise_privileges();

835

if(ret != 0){

671

836

errno = old_errno;

672

return ret_errno;

837

return ret;

673

838

}

674

839

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

675

ret_errno = errno;

840

ret = errno;

676

841

}

677

842

errno = old_errno;

678

return ret_errno;

843

return ret;

679

844

}

680

845

681

846

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

682

847

__attribute__((warn_unused_result))

683

error_t lower_privileges(void){

684

error_t old_errno = errno;

685

error_t ret_errno = 0;

848

int lower_privileges(void){

849

int old_errno = errno;

850

int ret = 0;

686

851

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

687

ret_errno = errno;

852

ret = errno;

688

853

}

689

854

errno = old_errno;

690

return ret_errno;

855

return ret;

691

856

}

692

857

693

858

/* Lower privileges permanently */

694

859

__attribute__((warn_unused_result))

695

error_t lower_privileges_permanently(void){

696

error_t old_errno = errno;

697

error_t ret_errno = 0;

860

int lower_privileges_permanently(void){

861

int old_errno = errno;

862

int ret = 0;

698

863

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

699

ret_errno = errno;

864

ret = errno;

700

865

}

701

866

errno = old_errno;

702

return ret_errno;

867

return ret;

703

868

}

704

869

705

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

870

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

706

871

__attribute__((nonnull, warn_unused_result))

707

static bool add_remove_local_route(const bool add,

872

static bool add_delete_local_route(const bool add,

708

873

const char *address,

709

874

AvahiIfIndex if_index){

710

875

int ret;

711

876

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

712

877

char add_arg[] = "add";

713

char remove_arg[] = "remove";

878

char delete_arg[] = "delete";

879

char debug_flag[] = "--debug";

714

880

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

715

881

if(pluginhelperdir == NULL){

716

882

if(debug){

760

926

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

761

927

_exit(EX_OSERR);

762

928

}

763

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

929

ret = close(devnull);

764

930

if(ret == -1){

765

931

perror_plus("close");

766

932

_exit(EX_OSERR);

783

949

helper, O_RDONLY));

784

950

if(helper_fd == -1){

785

951

perror_plus("openat");

952

close(helperdir_fd);

786

953

_exit(EX_UNAVAILABLE);

787

954

}

788

TEMP_FAILURE_RETRY(close(helperdir_fd));

955

close(helperdir_fd);

789

956

#ifdef __GNUC__

790

957

#pragma GCC diagnostic push

791

958

#pragma GCC diagnostic ignored "-Wcast-qual"

792

959

#endif

793

960

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

794

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

795

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

961

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

962

interface, debug ? debug_flag : NULL, NULL },

963

environ) == -1){

796

964

#ifdef __GNUC__

797

965

#pragma GCC diagnostic pop

798

966

#endif

850

1018

__attribute__((nonnull, warn_unused_result))

851

1019

static bool add_local_route(const char *address,

852

1020

AvahiIfIndex if_index){

853

return add_remove_local_route(true, address, 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);

854

1025

}

855

1026

856

1027

__attribute__((nonnull, warn_unused_result))

857

static bool remove_local_route(const char *address,

1028

static bool delete_local_route(const char *address,

858

1029

AvahiIfIndex if_index){

859

return add_remove_local_route(false, address, 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);

860

1034

}

861

1035

862

1036

/* Called when a Mandos server is found */

952

1126

goto mandos_end;

953

1127

}

954

1128

955

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

956

1129

if(af == AF_INET6){

957

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

958

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

1130

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

1131

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

1132

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

959

1133

} else { /* IPv4 */

960

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

961

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

1134

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

1135

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

1136

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

962

1137

}

963

1138

if(ret < 0 ){

964

1139

int e = errno;

1043

1218

sizeof(struct sockaddr_in));

1044

1219

}

1045

1220

if(ret < 0){

1046

if(errno == ENETUNREACH

1221

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

1047

1222

and if_index != AVAHI_IF_UNSPEC

1048

1223

and connect_to == NULL

1049

1224

and not route_added and

1065

1240

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

1066

1241

https://bugs.debian.org/587961

1067

1242

*/

1243

if(debug){

1244

fprintf_plus(stderr, "Mandos server unreachable, trying"

1245

" direct route\n");

1246

}

1068

1247

int e = errno;

1069

1248

route_added = add_local_route(ip, if_index);

1070

1249

if(route_added){

1274

1453

mandos_end:

1275

1454

{

1276

1455

if(route_added){

1277

if(not remove_local_route(ip, if_index)){

1278

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

1456

if(not delete_local_route(ip, if_index)){

1457

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

1279

1458

" interface %d", ip, if_index);

1280

1459

}

1281

1460

}

1283

1462

free(decrypted_buffer);

1284

1463

free(buffer);

1285

1464

if(tcp_sd >= 0){

1286

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

1465

ret = close(tcp_sd);

1287

1466

}

1288

1467

if(ret == -1){

1289

1468

if(e == 0){

1444

1623

__attribute__((nonnull, warn_unused_result))

1445

1624

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

1446

1625

int ret;

1447

error_t ret_errno;

1626

int old_errno;

1448

1627

1449

1628

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

1450

1629

if(s < 0){

1451

ret_errno = errno;

1630

old_errno = errno;

1452

1631

perror_plus("socket");

1453

errno = ret_errno;

1632

errno = old_errno;

1454

1633

return false;

1455

1634

}

1456

strcpy(ifr->ifr_name, ifname);

1635

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

1636

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

1457

1637

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1458

1638

if(ret == -1){

1459

1639

if(debug){

1460

ret_errno = errno;

1640

old_errno = errno;

1461

1641

perror_plus("ioctl SIOCGIFFLAGS");

1462

errno = ret_errno;

1642

errno = old_errno;

1463

1643

}

1464

1644

return false;

1465

1645

}

1729

1909

return;

1730

1910

}

1731

1911

}

1732

#ifdef __GLIBC__

1733

#if __GLIBC_PREREQ(2, 15)

1734

1912

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

1735

1913

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__ */

1744

1914

if(numhooks == -1){

1745

1915

perror_plus("scandir");

1746

1916

return;

1828

1998

perror_plus("openat");

1829

1999

_exit(EXIT_FAILURE);

1830

2000

}

1831

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

2001

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

1832

2002

perror_plus("close");

1833

2003

_exit(EXIT_FAILURE);

1834

2004

}

1837

2007

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

1838

2008

_exit(EX_OSERR);

1839

2009

}

1840

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

2010

ret = close(devnull);

1841

2011

if(ret == -1){

1842

2012

perror_plus("close");

1843

2013

_exit(EX_OSERR);

1892

2062

free(direntry);

1893

2063

}

1894

2064

free(direntries);

1895

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

2065

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

1896

2066

perror_plus("close");

1897

2067

} else {

1898

2068

hookdir_fd = -1;

1901

2071

}

1902

2072

1903

2073

__attribute__((nonnull, warn_unused_result))

1904

error_t bring_up_interface(const char *const interface,

1905

const float delay){

1906

error_t old_errno = errno;

2074

int bring_up_interface(const char *const interface,

2075

const float delay){

2076

int old_errno = errno;

1907

2077

int ret;

1908

2078

struct ifreq network;

1909

2079

unsigned int if_index = if_nametoindex(interface);

1919

2089

}

1920

2090

1921

2091

if(not interface_is_up(interface)){

1922

error_t ret_errno = 0, ioctl_errno = 0;

2092

int ret_errno = 0;

2093

int ioctl_errno = 0;

1923

2094

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

1924

2095

ret_errno = errno;

1925

2096

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

1938

2109

}

1939

2110

1940

2111

if(quit_now){

1941

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

2112

ret = close(sd);

1942

2113

if(ret == -1){

1943

2114

perror_plus("close");

1944

2115

}

1994

2165

}

1995

2166

1996

2167

/* Close the socket */

1997

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

2168

ret = close(sd);

1998

2169

if(ret == -1){

1999

2170

perror_plus("close");

2000

2171

}

2028

2199

}

2029

2200

2030

2201

__attribute__((nonnull, warn_unused_result))

2031

error_t take_down_interface(const char *const interface){

2032

error_t old_errno = errno;

2202

int take_down_interface(const char *const interface){

2203

int old_errno = errno;

2033

2204

struct ifreq network;

2034

2205

unsigned int if_index = if_nametoindex(interface);

2035

2206

if(if_index == 0){

2038

2209

return ENXIO;

2039

2210

}

2040

2211

if(interface_is_up(interface)){

2041

error_t ret_errno = 0, ioctl_errno = 0;

2212

int ret_errno = 0;

2213

int ioctl_errno = 0;

2042

2214

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

2043

2215

ret_errno = errno;

2044

2216

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

2082

2254

}

2083

2255

2084

2256

/* Close the socket */

2085

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

2257

int ret = close(sd);

2086

2258

if(ret == -1){

2087

2259

perror_plus("close");

2088

2260

}

2103

2275

}

2104

2276

2105

2277

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

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 };

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 };

2110

2283

AvahiSServiceBrowser *sb = NULL;

2111

2284

error_t ret_errno;

2112

2285

int ret;

2121

2294

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2122

2295

const char *seckey = PATHDIR "/" SECKEY;

2123

2296

const char *pubkey = PATHDIR "/" PUBKEY;

2297

const char *dh_params_file = NULL;

2124

2298

char *interfaces_hooks = NULL;

2125

2299

2126

2300

bool gnutls_initialized = false;

2179

2353

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

2180

2354

" Diffie-Hellman key exchange",

2181

2355

.group = 2 },

2356

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

2357

.arg = "FILE",

2358

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

2359

" for the Diffie-Hellman key exchange",

2360

.group = 2 },

2182

2361

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

2183

2362

.arg = "STRING",

2184

2363

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

2239

2418

}

2240

2419

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

2241

2420

break;

2421

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

2422

dh_params_file = arg;

2423

break;

2242

2424

case 130: /* --priority */

2243

2425

mc.priority = arg;

2244

2426

break;

2284

2466

.args_doc = "",

2285

2467

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

2286

2468

" passwords from a Mandos server" };

2287

ret = argp_parse(&argp, argc, argv,

2288

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2289

switch(ret){

2469

ret_errno = argp_parse(&argp, argc, argv,

2470

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2471

switch(ret_errno){

2290

2472

case 0:

2291

2473

break;

2292

2474

case ENOMEM:

2293

2475

default:

2294

errno = ret;

2476

errno = ret_errno;

2295

2477

perror_plus("argp_parse");

2296

2478

exitcode = EX_OSERR;

2297

2479

goto end;

2306

2488

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

2307

2489

2308

2490

/* Re-raise privileges */

2309

ret_errno = raise_privileges();

2310

if(ret_errno != 0){

2311

errno = ret_errno;

2491

ret = raise_privileges();

2492

if(ret != 0){

2493

errno = ret;

2312

2494

perror_plus("Failed to raise privileges");

2313

2495

} else {

2314

2496

struct stat st;

2330

2512

}

2331

2513

}

2332

2514

}

2333

TEMP_FAILURE_RETRY(close(seckey_fd));

2515

close(seckey_fd);

2334

2516

}

2335

2517

}

2336

2518

2351

2533

}

2352

2534

}

2353

2535

}

2354

TEMP_FAILURE_RETRY(close(pubkey_fd));

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);

2355

2559

}

2356

2560

}

2357

2561

2358

2562

/* Lower privileges */

2359

ret_errno = lower_privileges();

2360

if(ret_errno != 0){

2361

errno = ret_errno;

2563

ret = lower_privileges();

2564

if(ret != 0){

2565

errno = ret;

2362

2566

perror_plus("Failed to lower privileges");

2363

2567

}

2364

2568

}

2534

2738

errno = bring_up_interface(interface, delay);

2535

2739

if(not interface_was_up){

2536

2740

if(errno != 0){

2537

perror_plus("Failed to bring up interface");

2741

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

2742

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

2538

2743

} else {

2539

2744

errno = argz_add(&interfaces_to_take_down,

2540

2745

&interfaces_to_take_down_size,

2563

2768

goto end;

2564

2769

}

2565

2770

2566

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

2771

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

2567

2772

if(ret == -1){

2568

2773

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

2569

2774

exitcode = EX_UNAVAILABLE;

2691

2896

2692

2897

/* Allocate a new server */

2693

2898

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2694

&config, NULL, NULL, &ret_errno);

2899

&config, NULL, NULL, &ret);

2695

2900

2696

2901

/* Free the Avahi configuration data */

2697

2902

avahi_server_config_free(&config);

2700

2905

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

2701

2906

if(mc.server == NULL){

2702

2907

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

2703

avahi_strerror(ret_errno));

2908

avahi_strerror(ret));

2704

2909

exitcode = EX_UNAVAILABLE;

2705

2910

goto end;

2706

2911

}

2758

2963

2759

2964

if(gnutls_initialized){

2760

2965

gnutls_certificate_free_credentials(mc.cred);

2761

gnutls_global_deinit();

2762

2966

gnutls_dh_params_deinit(mc.dh_params);

2763

2967

}

2764

2968

2787

2991

2788

2992

/* Re-raise privileges */

2789

2993

{

2790

ret_errno = raise_privileges();

2791

if(ret_errno != 0){

2792

errno = ret_errno;

2994

ret = raise_privileges();

2995

if(ret != 0){

2996

errno = ret;

2793

2997

perror_plus("Failed to raise privileges");

2794

2998

} else {

2795

2999

2803

3007

while((interface=argz_next(interfaces_to_take_down,

2804

3008

interfaces_to_take_down_size,

2805

3009

interface))){

2806

ret_errno = take_down_interface(interface);

2807

if(ret_errno != 0){

2808

errno = ret_errno;

3010

ret = take_down_interface(interface);

3011

if(ret != 0){

3012

errno = ret;

2809

3013

perror_plus("Failed to take down interface");

2810

3014

}

2811

3015

}

2816

3020

}

2817

3021

}

2818

3022

2819

ret_errno = lower_privileges_permanently();

2820

if(ret_errno != 0){

2821

errno = ret_errno;

3023

ret = lower_privileges_permanently();

3024

if(ret != 0){

3025

errno = ret;

2822

3026

perror_plus("Failed to lower privileges permanently");

2823

3027

}

2824

3028

}

2826

3030

free(interfaces_to_take_down);

2827

3031

free(interfaces_hooks);

2828

3032

3033

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

3034

uintmax_t level){

3035

struct dirent **direntries = NULL;

3036

int dret;

3037

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

3038

O_RDONLY

3039

| O_NOFOLLOW

3040

| O_DIRECTORY

3041

| O_PATH));

3042

if(dir_fd == -1){

3043

perror_plus("open");

3044

}

3045

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

3046

notdotentries, alphasort);

3047

if(numentries >= 0){

3048

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

3049

if(debug){

3050

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

3051

dirname, direntries[i]->d_name);

3052

}

3053

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

3054

if(dret == -1){

3055

if(errno == EISDIR){

3056

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

3057

AT_REMOVEDIR);

3058

}

3059

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

3060

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

3061

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

3062

/* Recurse only in this special case */

3063

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

3064

dret = 0;

3065

}

3066

if(dret == -1){

3067

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

3068

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

3069

}

3070

}

3071

free(direntries[i]);

3072

}

3073

3074

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

3075

free(direntries);

3076

if(numentries == -1){

3077

perror_plus("scandirat");

3078

}

3079

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3080

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

3081

perror_plus("rmdir");

3082

}

3083

} else {

3084

perror_plus("scandirat");

3085

}

3086

close(dir_fd);

3087

}

3088

2829

3089

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

2830

3090

if(tempdir != NULL){

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

}

3091

clean_dir_at(-1, tempdir, 0);

2874

3092

}

2875

3093

2876

3094

if(quit_now){