/mandos/trunk : revision 761

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

234

.af = af };

235

if(new_server->ip == NULL){

236

perror_plus("strdup");

237

free(new_server);

237

238

return false;

238

239

}

239

240

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

240

241

if(ret == -1){

241

242

perror_plus("clock_gettime");

243

#ifdef __GNUC__

244

#pragma GCC diagnostic push

245

#pragma GCC diagnostic ignored "-Wcast-qual"

246

#endif

247

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

248

#ifdef __GNUC__

249

#pragma GCC diagnostic pop

250

#endif

251

free(new_server);

242

252

return false;

243

253

}

244

254

/* Special case of first server */

483

493

return plaintext_length;

484

494

}

485

495

496

__attribute__((warn_unused_result, const))

497

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

498

if(str == NULL)

499

return "(unknown)";

500

return str;

501

}

502

486

503

__attribute__((warn_unused_result))

487

504

static const char *safer_gnutls_strerror(int value){

488

505

const char *ret = gnutls_strerror(value);

489

if(ret == NULL)

490

ret = "(unknown)";

491

return ret;

506

return safe_string(ret);

492

507

}

493

508

494

509

/* GnuTLS log function callback */

503

518

const char *seckeyfilename,

504

519

mandos_context *mc){

505

520

int ret;

521

unsigned int uret;

506

522

507

523

if(debug){

508

524

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

559

575

safer_gnutls_strerror(ret));

560

576

goto globalfail;

561

577

}

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;

585

while(true){

586

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

587

(size_t)buffer.size,

588

(size_t)buffer_capacity);

589

if(buffer_capacity == 0){

590

perror_plus("incbuffer");

591

free(buffer.data);

592

buffer.data = NULL;

593

break;

594

}

595

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

596

BUFFER_SIZE);

597

/* EOF */

598

if(bytes_read == 0){

599

break;

600

}

601

/* check bytes_read for failure */

602

if(bytes_read < 0){

603

perror_plus("read");

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);

627

if(ret != GNUTLS_E_SUCCESS){

628

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

629

safer_gnutls_strerror(ret));

630

privkey = NULL;

631

}

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

}

644

}

645

}

646

}

647

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

648

/* Err on the side of caution */

649

sec_param = GNUTLS_SEC_PARAM_ULTRA;

650

if(debug){

651

fprintf_plus(stderr, "Falling back to security parameter"

652

" \"%s\"\n",

653

safe_string(gnutls_sec_param_get_name

654

(sec_param)));

655

}

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",

664

safe_string(gnutls_sec_param_get_name

665

(sec_param)),

666

mc->dh_bits);

667

}

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)),

672

safer_gnutls_strerror(ret));

673

goto globalfail;

674

}

675

} else if(debug){

676

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

677

mc->dh_bits);

678

}

562

679

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

563

680

if(ret != GNUTLS_E_SUCCESS){

564

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

565

safer_gnutls_strerror(ret));

681

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

682

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

566

683

goto globalfail;

567

684

}

568

685

640

757

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

641

758

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

642

759

760

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

761

__attribute__((warn_unused_result))

762

error_t raise_privileges(void){

763

error_t old_errno = errno;

764

error_t ret_errno = 0;

765

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

766

ret_errno = errno;

767

}

768

errno = old_errno;

769

return ret_errno;

770

}

771

772

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

773

__attribute__((warn_unused_result))

774

error_t raise_privileges_permanently(void){

775

error_t old_errno = errno;

776

error_t ret_errno = raise_privileges();

777

if(ret_errno != 0){

778

errno = old_errno;

779

return ret_errno;

780

}

781

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

782

ret_errno = errno;

783

}

784

errno = old_errno;

785

return ret_errno;

786

}

787

788

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

789

__attribute__((warn_unused_result))

790

error_t lower_privileges(void){

791

error_t old_errno = errno;

792

error_t ret_errno = 0;

793

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

794

ret_errno = errno;

795

}

796

errno = old_errno;

797

return ret_errno;

798

}

799

800

/* Lower privileges permanently */

801

__attribute__((warn_unused_result))

802

error_t lower_privileges_permanently(void){

803

error_t old_errno = errno;

804

error_t ret_errno = 0;

805

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

806

ret_errno = errno;

807

}

808

errno = old_errno;

809

return ret_errno;

810

}

811

812

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

813

__attribute__((nonnull, warn_unused_result))

814

static bool add_delete_local_route(const bool add,

815

const char *address,

816

AvahiIfIndex if_index){

817

int ret;

818

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

819

char add_arg[] = "add";

820

char delete_arg[] = "delete";

821

char debug_flag[] = "--debug";

822

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

823

if(pluginhelperdir == NULL){

824

if(debug){

825

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

826

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

827

}

828

return false;

829

}

830

831

char interface[IF_NAMESIZE];

832

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

833

perror_plus("if_indextoname");

834

return false;

835

}

836

837

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

838

if(devnull == -1){

839

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

840

return false;

841

}

842

pid_t pid = fork();

843

if(pid == 0){

844

/* Child */

845

/* Raise privileges */

846

errno = raise_privileges_permanently();

847

if(errno != 0){

848

perror_plus("Failed to raise privileges");

849

/* _exit(EX_NOPERM); */

850

} else {

851

/* Set group */

852

errno = 0;

853

ret = setgid(0);

854

if(ret == -1){

855

perror_plus("setgid");

856

_exit(EX_NOPERM);

857

}

858

/* Reset supplementary groups */

859

errno = 0;

860

ret = setgroups(0, NULL);

861

if(ret == -1){

862

perror_plus("setgroups");

863

_exit(EX_NOPERM);

864

}

865

}

866

ret = dup2(devnull, STDIN_FILENO);

867

if(ret == -1){

868

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

869

_exit(EX_OSERR);

870

}

871

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

872

if(ret == -1){

873

perror_plus("close");

874

_exit(EX_OSERR);

875

}

876

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

877

if(ret == -1){

878

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

879

_exit(EX_OSERR);

880

}

881

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

882

O_RDONLY

883

| O_DIRECTORY

884

| O_PATH

885

| O_CLOEXEC));

886

if(helperdir_fd == -1){

887

perror_plus("open");

888

_exit(EX_UNAVAILABLE);

889

}

890

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

891

helper, O_RDONLY));

892

if(helper_fd == -1){

893

perror_plus("openat");

894

_exit(EX_UNAVAILABLE);

895

}

896

TEMP_FAILURE_RETRY(close(helperdir_fd));

897

#ifdef __GNUC__

898

#pragma GCC diagnostic push

899

#pragma GCC diagnostic ignored "-Wcast-qual"

900

#endif

901

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

902

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

903

interface, debug ? debug_flag : NULL, NULL },

904

environ) == -1){

905

#ifdef __GNUC__

906

#pragma GCC diagnostic pop

907

#endif

908

perror_plus("fexecve");

909

_exit(EXIT_FAILURE);

910

}

911

}

912

if(pid == -1){

913

perror_plus("fork");

914

return false;

915

}

916

int status;

917

pid_t pret = -1;

918

errno = 0;

919

do {

920

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

921

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

922

int errno_raising = 0;

923

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

924

errno_raising = errno;

925

perror_plus("Failed to raise privileges in order to"

926

" kill helper program");

927

}

928

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

929

perror_plus("kill");

930

}

931

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

932

perror_plus("Failed to lower privileges after killing"

933

" helper program");

934

}

935

return false;

936

}

937

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

938

if(pret == -1){

939

perror_plus("waitpid");

940

return false;

941

}

942

if(WIFEXITED(status)){

943

if(WEXITSTATUS(status) != 0){

944

fprintf_plus(stderr, "Error: iprouteadddel exited"

945

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

946

return false;

947

}

948

return true;

949

}

950

if(WIFSIGNALED(status)){

951

fprintf_plus(stderr, "Error: iprouteadddel died by"

952

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

953

return false;

954

}

955

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

956

return false;

957

}

958

959

__attribute__((nonnull, warn_unused_result))

960

static bool add_local_route(const char *address,

961

AvahiIfIndex if_index){

962

if(debug){

963

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

964

}

965

return add_delete_local_route(true, address, if_index);

966

}

967

968

__attribute__((nonnull, warn_unused_result))

969

static bool delete_local_route(const char *address,

970

AvahiIfIndex if_index){

971

if(debug){

972

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

973

}

974

return add_delete_local_route(false, address, if_index);

975

}

976

643

977

/* Called when a Mandos server is found */

644

978

__attribute__((nonnull, warn_unused_result))

645

979

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

656

990

int retval = -1;

657

991

gnutls_session_t session;

658

992

int pf; /* Protocol family */

993

bool route_added = false;

659

994

660

995

errno = 0;

661

996

719

1054

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

720

1055

}

721

1056

722

tcp_sd = socket(pf, SOCK_STREAM, 0);

1057

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

723

1058

if(tcp_sd < 0){

724

1059

int e = errno;

725

1060

perror_plus("socket");

814

1149

goto mandos_end;

815

1150

}

816

1151

817

if(af == AF_INET6){

818

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

819

sizeof(struct sockaddr_in6));

820

} else {

821

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

822

sizeof(struct sockaddr_in));

823

}

824

if(ret < 0){

825

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

826

int e = errno;

827

perror_plus("connect");

828

errno = e;

829

}

830

goto mandos_end;

831

}

832

833

if(quit_now){

834

errno = EINTR;

835

goto mandos_end;

1152

while(true){

1153

if(af == AF_INET6){

1154

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

1155

sizeof(struct sockaddr_in6));

1156

} else {

1157

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

1158

sizeof(struct sockaddr_in));

1159

}

1160

if(ret < 0){

1161

if(errno == ENETUNREACH

1162

and if_index != AVAHI_IF_UNSPEC

1163

and connect_to == NULL

1164

and not route_added and

1165

((af == AF_INET6 and not

1166

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1167

&to)->sin6_addr)))

1168

or (af == AF_INET and

1169

/* Not a a IPv4LL address */

1170

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

1171

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

1172

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

1173

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

1174

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

1175

connect to a Mandos server announced by Avahi on a server

1176

host with a global address. Work around this by retrying

1177

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

1178

1179

Avahi bug reference:

1180

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

1181

https://bugs.debian.org/587961

1182

*/

1183

if(debug){

1184

fprintf_plus(stderr, "Mandos server unreachable, trying"

1185

" direct route\n");

1186

}

1187

int e = errno;

1188

route_added = add_local_route(ip, if_index);

1189

if(route_added){

1190

continue;

1191

}

1192

errno = e;

1193

}

1194

if(errno != ECONNREFUSED or debug){

1195

int e = errno;

1196

perror_plus("connect");

1197

errno = e;

1198

}

1199

goto mandos_end;

1200

}

1201

1202

if(quit_now){

1203

errno = EINTR;

1204

goto mandos_end;

1205

}

1206

break;

836

1207

}

837

1208

838

1209

const char *out = mandos_protocol_version;

1021

1392

1022

1393

mandos_end:

1023

1394

{

1395

if(route_added){

1396

if(not delete_local_route(ip, if_index)){

1397

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

1398

" interface %d", ip, if_index);

1399

}

1400

}

1024

1401

int e = errno;

1025

1402

free(decrypted_buffer);

1026

1403

free(buffer);

1066

1443

timed out */

1067

1444

1068

1445

if(quit_now){

1446

avahi_s_service_resolver_free(r);

1069

1447

return;

1070

1448

}

1071

1449

1451

1829

}

1452

1830

}

1453

1831

1454

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

1455

__attribute__((warn_unused_result))

1456

error_t raise_privileges(void){

1457

error_t old_errno = errno;

1458

error_t ret_errno = 0;

1459

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

1460

ret_errno = errno;

1461

perror_plus("seteuid");

1462

}

1463

errno = old_errno;

1464

return ret_errno;

1465

}

1466

1467

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

1468

__attribute__((warn_unused_result))

1469

error_t raise_privileges_permanently(void){

1470

error_t old_errno = errno;

1471

error_t ret_errno = raise_privileges();

1472

if(ret_errno != 0){

1473

errno = old_errno;

1474

return ret_errno;

1475

}

1476

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

1477

ret_errno = errno;

1478

perror_plus("seteuid");

1479

}

1480

errno = old_errno;

1481

return ret_errno;

1482

}

1483

1484

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

1485

__attribute__((warn_unused_result))

1486

error_t lower_privileges(void){

1487

error_t old_errno = errno;

1488

error_t ret_errno = 0;

1489

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

1490

ret_errno = errno;

1491

perror_plus("seteuid");

1492

}

1493

errno = old_errno;

1494

return ret_errno;

1495

}

1496

1497

/* Lower privileges permanently */

1498

__attribute__((warn_unused_result))

1499

error_t lower_privileges_permanently(void){

1500

error_t old_errno = errno;

1501

error_t ret_errno = 0;

1502

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

1503

ret_errno = errno;

1504

perror_plus("setuid");

1505

}

1506

errno = old_errno;

1507

return ret_errno;

1508

}

1509

1510

1832

__attribute__((nonnull))

1511

1833

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

1512

1834

const float delay){

1513

1835

struct dirent **direntries = NULL;

1514

1836

if(hookdir_fd == -1){

1515

hookdir_fd = open(hookdir, O_RDONLY);

1837

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1838

| O_CLOEXEC);

1516

1839

if(hookdir_fd == -1){

1517

1840

if(errno == ENOENT){

1518

1841

if(debug){

1543

1866

}

1544

1867

struct dirent *direntry;

1545

1868

int ret;

1546

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

1869

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

1870

if(devnull == -1){

1871

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

1872

return;

1873

}

1547

1874

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

1548

1875

direntry = direntries[i];

1549

1876

if(debug){

1554

1881

if(hook_pid == 0){

1555

1882

/* Child */

1556

1883

/* Raise privileges */

1557

if(raise_privileges_permanently() != 0){

1884

errno = raise_privileges_permanently();

1885

if(errno != 0){

1558

1886

perror_plus("Failed to raise privileges");

1559

1887

_exit(EX_NOPERM);

1560

1888

}

1572

1900

perror_plus("setgroups");

1573

1901

_exit(EX_NOPERM);

1574

1902

}

1575

ret = dup2(devnull, STDIN_FILENO);

1576

if(ret == -1){

1577

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

1578

_exit(EX_OSERR);

1579

}

1580

ret = close(devnull);

1581

if(ret == -1){

1582

perror_plus("close");

1583

_exit(EX_OSERR);

1584

}

1585

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1586

if(ret == -1){

1587

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

1588

_exit(EX_OSERR);

1589

}

1590

1903

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

1591

1904

if(ret == -1){

1592

1905

perror_plus("setenv");

1627

1940

_exit(EX_OSERR);

1628

1941

}

1629

1942

}

1630

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

1943

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

1944

direntry->d_name,

1945

O_RDONLY));

1631

1946

if(hook_fd == -1){

1632

1947

perror_plus("openat");

1633

1948

_exit(EXIT_FAILURE);

1636

1951

perror_plus("close");

1637

1952

_exit(EXIT_FAILURE);

1638

1953

}

1954

ret = dup2(devnull, STDIN_FILENO);

1955

if(ret == -1){

1956

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

1957

_exit(EX_OSERR);

1958

}

1959

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

1960

if(ret == -1){

1961

perror_plus("close");

1962

_exit(EX_OSERR);

1963

}

1964

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1965

if(ret == -1){

1966

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

1967

_exit(EX_OSERR);

1968

}

1639

1969

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

1640

1970

environ) == -1){

1641

1971

perror_plus("fexecve");

1642

1972

_exit(EXIT_FAILURE);

1643

1973

}

1644

1974

} else {

1975

if(hook_pid == -1){

1976

perror_plus("fork");

1977

free(direntry);

1978

continue;

1979

}

1645

1980

int status;

1646

1981

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

1647

1982

perror_plus("waitpid");

1983

free(direntry);

1648

1984

continue;

1649

1985

}

1650

1986

if(WIFEXITED(status)){

1652

1988

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

1653

1989

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

1654

1990

WEXITSTATUS(status));

1991

free(direntry);

1655

1992

continue;

1656

1993

}

1657

1994

} else if(WIFSIGNALED(status)){

1658

1995

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

1659

1996

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

1660

1997

WTERMSIG(status));

1998

free(direntry);

1661

1999

continue;

1662

2000

} else {

1663

2001

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

1664

2002

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

2003

free(direntry);

1665

2004

continue;

1666

2005

}

1667

2006

}

1669

2008

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

1670

2009

direntry->d_name);

1671

2010

}

2011

free(direntry);

1672

2012

}

1673

2013

free(direntries);

1674

2014

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

1733

2073

/* Raise privileges */

1734

2074

ret_errno = raise_privileges();

1735

2075

if(ret_errno != 0){

2076

errno = ret_errno;

1736

2077

perror_plus("Failed to raise privileges");

1737

2078

}

1738

2079

1842

2183

/* Raise privileges */

1843

2184

ret_errno = raise_privileges();

1844

2185

if(ret_errno != 0){

2186

errno = ret_errno;

1845

2187

perror_plus("Failed to raise privileges");

1846

2188

}

1847

2189

1880

2222

}

1881

2223

1882

2224

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

1883

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

2225

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

1884

2226

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

1885

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

2227

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

1886

2228

.interfaces = NULL, .interfaces_size = 0 };

1887

2229

AvahiSServiceBrowser *sb = NULL;

1888

2230

error_t ret_errno;

2077

2419

goto end;

2078

2420

}

2079

2421

}

2080

2422

2081

2423

{

2082

2424

/* Work around Debian bug #633582:

2083

2425

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

2110

2452

TEMP_FAILURE_RETRY(close(seckey_fd));

2111

2453

}

2112

2454

}

2113

2455

2114

2456

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

2115

2457

int pubkey_fd = open(pubkey, O_RDONLY);

2116

2458

if(pubkey_fd == -1){

2131

2473

TEMP_FAILURE_RETRY(close(pubkey_fd));

2132

2474

}

2133

2475

}

2134

2476

2135

2477

/* Lower privileges */

2136

2478

ret_errno = lower_privileges();

2137

2479

if(ret_errno != 0){

2266

2608

if(ret_errno != 0){

2267

2609

errno = ret_errno;

2268

2610

perror_plus("argz_add");

2611

free(direntries[i]);

2269

2612

continue;

2270

2613

}

2271

2614

if(debug){

2272

2615

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

2273

2616

direntries[i]->d_name);

2274

2617

}

2618

free(direntries[i]);

2275

2619

}

2276

2620

free(direntries);

2277

2621

} else {

2547

2891

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

2548

2892

while(mc.current_server != NULL){

2549

2893

server *next = mc.current_server->next;

2894

#ifdef __GNUC__

2895

#pragma GCC diagnostic push

2896

#pragma GCC diagnostic ignored "-Wcast-qual"

2897

#endif

2898

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

2899

#ifdef __GNUC__

2900

#pragma GCC diagnostic pop

2901

#endif

2550

2902

free(mc.current_server);

2551

2903

mc.current_server = next;

2552

2904

}

2556

2908

{

2557

2909

ret_errno = raise_privileges();

2558

2910

if(ret_errno != 0){

2911

errno = ret_errno;

2559

2912

perror_plus("Failed to raise privileges");

2560

2913

} else {

2561

2914

2584

2937

2585

2938

ret_errno = lower_privileges_permanently();

2586

2939

if(ret_errno != 0){

2940

errno = ret_errno;

2587

2941

perror_plus("Failed to lower privileges permanently");

2588

2942

}

2589

2943

}

2594

2948

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

2595

2949

if(tempdir != NULL){

2596

2950

struct dirent **direntries = NULL;

2597

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

2598

O_NOFOLLOW));

2951

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

2952

| O_NOFOLLOW

2953

| O_DIRECTORY

2954

| O_PATH));

2599

2955

if(tempdir_fd == -1){

2600

2956

perror_plus("open");

2601

2957

} else {

2619

2975

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

2620

2976

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

2621

2977

}

2978

free(direntries[i]);

2622

2979

}

2623

2980

2624

2981

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