/mandos/trunk : revision 370

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

26

* along with this program. If not, see

27

* <http://www.gnu.org/licenses/>.

28

*

29

* Contact the authors at <mandos@recompile.se>.

29

* Contact the authors at <mandos@fukt.bsnet.se>.

30

*/

31

32

/* Needed by GPGME, specifically gpgme_data_seek() */

43

stdout, ferror(), remove() */

44

#include <stdint.h> /* uint16_t, uint32_t */

45

#include <stddef.h> /* NULL, size_t, ssize_t */

46

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

47

strtof(), abort() */

46

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

47

srand(), strtof() */

48

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

49

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

50

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

62

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

63

strtoimax() */

64

#include <assert.h> /* assert() */

65

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

66

program_invocation_short_name */

67

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

65

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

66

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

68

67

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

69

68

SIOCSIFFLAGS, if_indextoname(),

70

69

if_nametoindex(), IF_NAMESIZE */

73

72

*/

74

73

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

75

74

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

76

setgid(), pause() */

77

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

75

setgid() */

76

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

78

77

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

79

78

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

80

79

argp_state, struct argp,

83

82

#include <signal.h> /* sigemptyset(), sigaddset(),

84

83

sigaction(), SIGTERM, sig_atomic_t,

85

84

raise() */

86

#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,

87

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

88

85

89

86

#ifdef __linux__

90

87

#include <sys/klog.h> /* klogctl() */

127

124

bool debug = false;

128

125

static const char mandos_protocol_version[] = "1";

129

126

const char *argp_program_version = "mandos-client " VERSION;

130

const char *argp_program_bug_address = "<mandos@recompile.se>";

131

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

132

char *connect_to = NULL;

133

134

/* Doubly linked list that need to be circularly linked when used */

135

typedef struct server{

136

const char *ip;

137

uint16_t port;

138

AvahiIfIndex if_index;

139

int af;

140

struct timespec last_seen;

141

struct server *next;

142

struct server *prev;

143

} server;

127

const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";

144

128

145

129

/* Used for passing in values through the Avahi callback functions */

146

130

typedef struct {

151

135

gnutls_dh_params_t dh_params;

152

136

const char *priority;

153

137

gpgme_ctx_t ctx;

154

server *current_server;

155

138

} mandos_context;

156

139

157

140

/* global context so signal handler can reach it*/

158

141

mandos_context mc = { .simple_poll = NULL, .server = NULL,

159

142

.dh_bits = 1024, .priority = "SECURE256"

160

":!CTYPE-X.509:+CTYPE-OPENPGP",

161

.current_server = NULL };

162

163

sig_atomic_t quit_now = 0;

164

int signal_received = 0;

165

166

/* Function to use when printing errors */

167

void perror_plus(const char *print_text){

168

fprintf(stderr, "Mandos plugin %s: ",

169

program_invocation_short_name);

170

perror(print_text);

171

}

143

":!CTYPE-X.509:+CTYPE-OPENPGP" };

172

144

173

145

/*

174

146

* Make additional room in "buffer" for at least BUFFER_SIZE more

187

159

return buffer_capacity;

188

160

}

189

161

190

/* Add server to set of servers to retry periodically */

191

int add_server(const char *ip, uint16_t port,

192

AvahiIfIndex if_index,

193

int af){

194

int ret;

195

server *new_server = malloc(sizeof(server));

196

if(new_server == NULL){

197

perror_plus("malloc");

198

return -1;

199

}

200

*new_server = (server){ .ip = strdup(ip),

201

.port = port,

202

.if_index = if_index,

203

.af = af };

204

if(new_server->ip == NULL){

205

perror_plus("strdup");

206

return -1;

207

}

208

/* Special case of first server */

209

if (mc.current_server == NULL){

210

new_server->next = new_server;

211

new_server->prev = new_server;

212

mc.current_server = new_server;

213

/* Place the new server last in the list */

214

} else {

215

new_server->next = mc.current_server;

216

new_server->prev = mc.current_server->prev;

217

new_server->prev->next = new_server;

218

mc.current_server->prev = new_server;

219

}

220

ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);

221

if(ret == -1){

222

perror_plus("clock_gettime");

223

return -1;

224

}

225

return 0;

226

}

227

228

162

/*

229

163

* Initialize GPGME.

230

164

*/

244

178

245

179

fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));

246

180

if(fd == -1){

247

perror_plus("open");

181

perror("open");

248

182

return false;

249

183

}

250

184

264

198

265

199

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

266

200

if(ret == -1){

267

perror_plus("close");

201

perror("close");

268

202

}

269

203

gpgme_data_release(pgp_data);

270

204

return true;

283

217

return false;

284

218

}

285

219

286

/* Set GPGME home directory for the OpenPGP engine only */

220

/* Set GPGME home directory for the OpenPGP engine only */

287

221

rc = gpgme_get_engine_info(&engine_info);

288

222

if(rc != GPG_ERR_NO_ERROR){

289

223

fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",

395

329

396

330

/* Seek back to the beginning of the GPGME plaintext data buffer */

397

331

if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){

398

perror_plus("gpgme_data_seek");

332

perror("gpgme_data_seek");

399

333

plaintext_length = -1;

400

334

goto decrypt_end;

401

335

}

406

340

(size_t)plaintext_length,

407

341

plaintext_capacity);

408

342

if(plaintext_capacity == 0){

409

perror_plus("incbuffer");

343

perror("incbuffer");

410

344

plaintext_length = -1;

411

345

goto decrypt_end;

412

346

}

419

353

break;

420

354

}

421

355

if(ret < 0){

422

perror_plus("gpgme_data_read");

356

perror("gpgme_data_read");

423

357

plaintext_length = -1;

424

358

goto decrypt_end;

425

359

}

482

416

}

483

417

484

418

/* OpenPGP credentials */

485

ret = gnutls_certificate_allocate_credentials(&mc.cred);

419

gnutls_certificate_allocate_credentials(&mc.cred);

486

420

if(ret != GNUTLS_E_SUCCESS){

487

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

421

fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning

422

from

423

-Wunreachable-code

424

*/

488

425

safer_gnutls_strerror(ret));

489

426

gnutls_global_deinit();

490

427

return -1;

539

476

/* GnuTLS session creation */

540

477

do {

541

478

ret = gnutls_init(session, GNUTLS_SERVER);

542

if(quit_now){

543

return -1;

544

}

545

479

} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);

546

480

if(ret != GNUTLS_E_SUCCESS){

547

481

fprintf(stderr, "Error in GnuTLS session initialization: %s\n",

552

486

const char *err;

553

487

do {

554

488

ret = gnutls_priority_set_direct(*session, mc.priority, &err);

555

if(quit_now){

556

gnutls_deinit(*session);

557

return -1;

558

}

559

489

} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);

560

490

if(ret != GNUTLS_E_SUCCESS){

561

491

fprintf(stderr, "Syntax error at: %s\n", err);

569

499

do {

570

500

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

571

501

mc.cred);

572

if(quit_now){

573

gnutls_deinit(*session);

574

return -1;

575

}

576

502

} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);

577

503

if(ret != GNUTLS_E_SUCCESS){

578

504

fprintf(stderr, "Error setting GnuTLS credentials: %s\n",

593

519

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

594

520

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

595

521

522

sig_atomic_t quit_now = 0;

523

int signal_received = 0;

524

596

525

/* Called when a Mandos server is found */

597

526

static int start_mandos_communication(const char *ip, uint16_t port,

598

527

AvahiIfIndex if_index,

604

533

struct sockaddr_in6 in6;

605

534

} to;

606

535

char *buffer = NULL;

607

char *decrypted_buffer = NULL;

536

char *decrypted_buffer;

608

537

size_t buffer_length = 0;

609

538

size_t buffer_capacity = 0;

610

539

size_t written;

611

int retval = -1;

540

int retval = 0;

612

541

gnutls_session_t session;

613

542

int pf; /* Protocol family */

614

543

615

errno = 0;

616

617

544

if(quit_now){

618

errno = EINTR;

619

545

return -1;

620

546

}

621

547

628

554

break;

629

555

default:

630

556

fprintf(stderr, "Bad address family: %d\n", af);

631

errno = EINVAL;

632

557

return -1;

633

558

}

634

559

644

569

645

570

tcp_sd = socket(pf, SOCK_STREAM, 0);

646

571

if(tcp_sd < 0){

647

int e = errno;

648

perror_plus("socket");

649

errno = e;

572

perror("socket");

573

retval = -1;

650

574

goto mandos_end;

651

575

}

652

576

653

577

if(quit_now){

654

errno = EINTR;

655

578

goto mandos_end;

656

579

}

657

580

664

587

ret = inet_pton(af, ip, &to.in.sin_addr);

665

588

}

666

589

if(ret < 0 ){

667

int e = errno;

668

perror_plus("inet_pton");

669

errno = e;

590

perror("inet_pton");

591

retval = -1;

670

592

goto mandos_end;

671

593

}

672

594

if(ret == 0){

673

int e = errno;

674

595

fprintf(stderr, "Bad address: %s\n", ip);

675

errno = e;

596

retval = -1;

676

597

goto mandos_end;

677

598

}

678

599

if(af == AF_INET6){

686

607

if(if_index == AVAHI_IF_UNSPEC){

687

608

fprintf(stderr, "An IPv6 link-local address is incomplete"

688

609

" without a network interface\n");

689

errno = EINVAL;

610

retval = -1;

690

611

goto mandos_end;

691

612

}

692

613

/* Set the network interface number as scope */

699

620

}

700

621

701

622

if(quit_now){

702

errno = EINTR;

703

623

goto mandos_end;

704

624

}

705

625

707

627

if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){

708

628

char interface[IF_NAMESIZE];

709

629

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

710

perror_plus("if_indextoname");

630

perror("if_indextoname");

711

631

} else {

712

632

fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",

713

633

ip, interface, port);

727

647

sizeof(addrstr));

728

648

}

729

649

if(pcret == NULL){

730

perror_plus("inet_ntop");

650

perror("inet_ntop");

731

651

} else {

732

652

if(strcmp(addrstr, ip) != 0){

733

653

fprintf(stderr, "Canonical address form: %s\n", addrstr);

736

656

}

737

657

738

658

if(quit_now){

739

errno = EINTR;

740

659

goto mandos_end;

741

660

}

742

661

746

665

ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */

747

666

}

748

667

if(ret < 0){

749

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

750

int e = errno;

751

perror_plus("connect");

752

errno = e;

753

}

668

perror("connect");

669

retval = -1;

754

670

goto mandos_end;

755

671

}

756

672

757

673

if(quit_now){

758

errno = EINTR;

759

674

goto mandos_end;

760

675

}

761

676

766

681

ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,

767

682

out_size - written));

768

683

if(ret == -1){

769

int e = errno;

770

perror_plus("write");

771

errno = e;

684

perror("write");

685

retval = -1;

772

686

goto mandos_end;

773

687

}

774

688

written += (size_t)ret;

784

698

}

785

699

786

700

if(quit_now){

787

errno = EINTR;

788

701

goto mandos_end;

789

702

}

790

703

}

794

707

}

795

708

796

709

if(quit_now){

797

errno = EINTR;

798

710

goto mandos_end;

799

711

}

800

712

801

/* Spurious warning from -Wint-to-pointer-cast */

802

713

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

803

714

804

715

if(quit_now){

805

errno = EINTR;

806

716

goto mandos_end;

807

717

}

808

718

809

719

do {

810

720

ret = gnutls_handshake(session);

811

721

if(quit_now){

812

errno = EINTR;

813

722

goto mandos_end;

814

723

}

815

724

} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);

819

728

fprintf(stderr, "*** GnuTLS Handshake failed ***\n");

820

729

gnutls_perror(ret);

821

730

}

822

errno = EPROTO;

731

retval = -1;

823

732

goto mandos_end;

824

733

}

825

734

833

742

while(true){

834

743

835

744

if(quit_now){

836

errno = EINTR;

837

745

goto mandos_end;

838

746

}

839

747

840

748

buffer_capacity = incbuffer(&buffer, buffer_length,

841

749

buffer_capacity);

842

750

if(buffer_capacity == 0){

843

int e = errno;

844

perror_plus("incbuffer");

845

errno = e;

751

perror("incbuffer");

752

retval = -1;

846

753

goto mandos_end;

847

754

}

848

755

849

756

if(quit_now){

850

errno = EINTR;

851

757

goto mandos_end;

852

758

}

853

759

866

772

ret = gnutls_handshake(session);

867

773

868

774

if(quit_now){

869

errno = EINTR;

870

775

goto mandos_end;

871

776

}

872

777

} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);

873

778

if(ret < 0){

874

779

fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");

875

780

gnutls_perror(ret);

876

errno = EPROTO;

781

retval = -1;

877

782

goto mandos_end;

878

783

}

879

784

break;

880

785

default:

881

786

fprintf(stderr, "Unknown error while reading data from"

882

787

" encrypted session with Mandos server\n");

788

retval = -1;

883

789

gnutls_bye(session, GNUTLS_SHUT_RDWR);

884

errno = EIO;

885

790

goto mandos_end;

886

791

}

887

792

} else {

894

799

}

895

800

896

801

if(quit_now){

897

errno = EINTR;

898

goto mandos_end;

899

}

900

901

do {

902

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

903

if(quit_now){

904

errno = EINTR;

905

goto mandos_end;

906

}

907

} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);

802

goto mandos_end;

803

}

804

805

gnutls_bye(session, GNUTLS_SHUT_RDWR);

806

807

if(quit_now){

808

goto mandos_end;

809

}

908

810

909

811

if(buffer_length > 0){

910

812

ssize_t decrypted_buffer_size;

916

818

written = 0;

917

819

while(written < (size_t) decrypted_buffer_size){

918

820

if(quit_now){

919

errno = EINTR;

920

821

goto mandos_end;

921

822

}

922

823

924

825

(size_t)decrypted_buffer_size - written,

925

826

stdout);

926

827

if(ret == 0 and ferror(stdout)){

927

int e = errno;

928

828

if(debug){

929

829

fprintf(stderr, "Error writing encrypted data: %s\n",

930

830

strerror(errno));

931

831

}

932

errno = e;

933

goto mandos_end;

832

retval = -1;

833

break;

934

834

}

935

835

written += (size_t)ret;

936

836

}

937

retval = 0;

837

free(decrypted_buffer);

838

} else {

839

retval = -1;

938

840

}

841

} else {

842

retval = -1;

939

843

}

940

844

941

845

/* Shutdown procedure */

942

846

943

847

mandos_end:

944

{

945

int e = errno;

946

free(decrypted_buffer);

947

free(buffer);

948

if(tcp_sd >= 0){

949

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

950

}

951

if(ret == -1){

952

if(e == 0){

953

e = errno;

954

}

955

perror_plus("close");

956

}

957

gnutls_deinit(session);

958

errno = e;

959

if(quit_now){

960

errno = EINTR;

961

retval = -1;

962

}

848

free(buffer);

849

if(tcp_sd >= 0){

850

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

851

}

852

if(ret == -1){

853

perror("close");

854

}

855

gnutls_deinit(session);

856

if(quit_now){

857

retval = -1;

963

858

}

964

859

return retval;

965

860

}

1008

903

avahi_proto_to_af(proto));

1009

904

if(ret == 0){

1010

905

avahi_simple_poll_quit(mc.simple_poll);

1011

} else {

1012

ret = add_server(ip, port, interface,

1013

avahi_proto_to_af(proto));

1014

906

}

1015

907

}

1016

908

}

1070

962

}

1071

963

}

1072

964

1073

/* Signal handler that stops main loop after SIGTERM */

965

/* stop main loop after sigterm has been called */

1074

966

static void handle_sigterm(int sig){

1075

967

if(quit_now){

1076

968

return;

1078

970

quit_now = 1;

1079

971

signal_received = sig;

1080

972

int old_errno = errno;

1081

/* set main loop to exit */

1082

973

if(mc.simple_poll != NULL){

1083

974

avahi_simple_poll_quit(mc.simple_poll);

1084

975

}

1085

976

errno = old_errno;

1086

977

}

1087

978

1088

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

1089

int ret;

1090

1091

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

1092

if(s < 0){

1093

perror_plus("socket");

1094

return false;

1095

}

1096

strcpy(ifr->ifr_name, ifname);

1097

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1098

if(ret == -1){

1099

if(debug){

1100

perror_plus("ioctl SIOCGIFFLAGS");

1101

}

1102

return false;

1103

}

1104

return true;

1105

}

1106

1107

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

1108

1109

/* Reject the loopback device */

1110

if(ifr->ifr_flags & IFF_LOOPBACK){

1111

if(debug){

1112

fprintf(stderr, "Rejecting loopback interface \"%s\"\n",

1113

ifname);

1114

}

1115

return false;

1116

}

1117

/* Accept point-to-point devices only if connect_to is specified */

1118

if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){

1119

if(debug){

1120

fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",

1121

ifname);

1122

}

1123

return true;

1124

}

1125

/* Otherwise, reject non-broadcast-capable devices */

1126

if(not (ifr->ifr_flags & IFF_BROADCAST)){

1127

if(debug){

1128

fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",

1129

ifname);

1130

}

1131

return false;

1132

}

1133

/* Reject non-ARP interfaces (including dummy interfaces) */

1134

if(ifr->ifr_flags & IFF_NOARP){

1135

if(debug){

1136

fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);

1137

}

1138

return false;

1139

}

1140

1141

/* Accept this device */

1142

if(debug){

1143

fprintf(stderr, "Interface \"%s\" is good\n", ifname);

1144

}

1145

return true;

1146

}

1147

1148

/*

1149

* This function determines if a directory entry in /sys/class/net

1150

* corresponds to an acceptable network device.

1151

* (This function is passed to scandir(3) as a filter function.)

1152

*/

1153

int good_interface(const struct dirent *if_entry){

1154

int ret;

1155

if(if_entry->d_name[0] == '.'){

1156

return 0;

1157

}

1158

struct ifreq ifr;

1159

1160

if(not get_flags(if_entry->d_name, &ifr)){

1161

return 0;

1162

}

1163

1164

if(not good_flags(if_entry->d_name, &ifr)){

1165

return 0;

1166

}

1167

return 1;

1168

}

1169

1170

int notdotentries(const struct dirent *direntry){

1171

/* Skip "." and ".." */

1172

if(direntry->d_name[0] == '.'

1173

and (direntry->d_name[1] == '\0'

1174

or (direntry->d_name[1] == '.'

1175

and direntry->d_name[2] == '\0'))){

1176

return 0;

1177

}

1178

return 1;

1179

}

1180

1181

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1182

int ret;

1183

struct timespec now;

1184

struct timespec waited_time;

1185

intmax_t block_time;

1186

1187

while(true){

1188

if(mc.current_server == NULL){

1189

if (debug){

1190

fprintf(stderr,

1191

"Wait until first server is found. No timeout!\n");

1192

}

1193

ret = avahi_simple_poll_iterate(s, -1);

1194

} else {

1195

if (debug){

1196

fprintf(stderr, "Check current_server if we should run it,"

1197

" or wait\n");

1198

}

1199

/* the current time */

1200

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1201

if(ret == -1){

1202

perror_plus("clock_gettime");

1203

return -1;

1204

}

1205

/* Calculating in ms how long time between now and server

1206

who we visted longest time ago. Now - last seen. */

1207

waited_time.tv_sec = (now.tv_sec

1208

- mc.current_server->last_seen.tv_sec);

1209

waited_time.tv_nsec = (now.tv_nsec

1210

- mc.current_server->last_seen.tv_nsec);

1211

/* total time is 10s/10,000ms.

1212

Converting to s from ms by dividing by 1,000,

1213

and ns to ms by dividing by 1,000,000. */

1214

block_time = ((retry_interval

1215

- ((intmax_t)waited_time.tv_sec * 1000))

1216

- ((intmax_t)waited_time.tv_nsec / 1000000));

1217

1218

if (debug){

1219

fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);

1220

}

1221

1222

if(block_time <= 0){

1223

ret = start_mandos_communication(mc.current_server->ip,

1224

mc.current_server->port,

1225

mc.current_server->if_index,

1226

mc.current_server->af);

1227

if(ret == 0){

1228

avahi_simple_poll_quit(mc.simple_poll);

1229

return 0;

1230

}

1231

ret = clock_gettime(CLOCK_MONOTONIC,

1232

&mc.current_server->last_seen);

1233

if(ret == -1){

1234

perror_plus("clock_gettime");

1235

return -1;

1236

}

1237

mc.current_server = mc.current_server->next;

1238

block_time = 0; /* Call avahi to find new Mandos

1239

servers, but don't block */

1240

}

1241

1242

ret = avahi_simple_poll_iterate(s, (int)block_time);

1243

}

1244

if(ret != 0){

1245

if (ret > 0 or errno != EINTR) {

1246

return (ret != 1) ? ret : 0;

1247

}

1248

}

1249

}

1250

}

1251

1252

979

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

1253

980

AvahiSServiceBrowser *sb = NULL;

1254

981

int error;

1256

983

intmax_t tmpmax;

1257

984

char *tmp;

1258

985

int exitcode = EXIT_SUCCESS;

1259

const char *interface = "";

986

const char *interface = "eth0";

1260

987

struct ifreq network;

1261

988

int sd = -1;

1262

989

bool take_down_interface = false;

1263

990

uid_t uid;

1264

991

gid_t gid;

992

char *connect_to = NULL;

1265

993

char tempdir[] = "/tmp/mandosXXXXXX";

1266

994

bool tempdir_created = false;

1267

995

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1271

999

bool gnutls_initialized = false;

1272

1000

bool gpgme_initialized = false;

1273

1001

float delay = 2.5f;

1274

double retry_interval = 10; /* 10s between trying a server and

1275

retrying the same server again */

1276

1002

1277

1003

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1278

1004

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1284

1010

errno = 0;

1285

1011

ret = setgid(gid);

1286

1012

if(ret == -1){

1287

perror_plus("setgid");

1013

perror("setgid");

1288

1014

}

1289

1015

1290

1016

/* Lower user privileges (temporarily) */

1291

1017

errno = 0;

1292

1018

ret = seteuid(uid);

1293

1019

if(ret == -1){

1294

perror_plus("seteuid");

1020

perror("seteuid");

1295

1021

}

1296

1022

1297

1023

if(quit_now){

1332

1058

.arg = "SECONDS",

1333

1059

.doc = "Maximum delay to wait for interface startup",

1334

1060

.group = 2 },

1335

{ .name = "retry", .key = 132,

1336

.arg = "SECONDS",

1337

.doc = "Retry interval used when denied by the mandos server",

1338

.group = 2 },

1339

/*

1340

* These reproduce what we would get without ARGP_NO_HELP

1341

*/

1342

{ .name = "help", .key = '?',

1343

.doc = "Give this help list", .group = -1 },

1344

{ .name = "usage", .key = -3,

1345

.doc = "Give a short usage message", .group = -1 },

1346

{ .name = "version", .key = 'V',

1347

.doc = "Print program version", .group = -1 },

1348

1061

{ .name = NULL }

1349

1062

};

1350

1063

1351

1064

error_t parse_opt(int key, char *arg,

1352

1065

struct argp_state *state){

1353

errno = 0;

1354

1066

switch(key){

1355

1067

case 128: /* --debug */

1356

1068

debug = true;

1372

1084

tmpmax = strtoimax(arg, &tmp, 10);

1373

1085

if(errno != 0 or tmp == arg or *tmp != '\0'

1374

1086

or tmpmax != (typeof(mc.dh_bits))tmpmax){

1375

argp_error(state, "Bad number of DH bits");

1087

fprintf(stderr, "Bad number of DH bits\n");

1088

exit(EXIT_FAILURE);

1376

1089

}

1377

1090

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

1378

1091

break;

1383

1096

errno = 0;

1384

1097

delay = strtof(arg, &tmp);

1385

1098

if(errno != 0 or tmp == arg or *tmp != '\0'){

1386

argp_error(state, "Bad delay");

1387

}

1388

case 132: /* --retry */

1389

errno = 0;

1390

retry_interval = strtod(arg, &tmp);

1391

if(errno != 0 or tmp == arg or *tmp != '\0'

1392

or (retry_interval * 1000) > INT_MAX

1393

or retry_interval < 0){

1394

argp_error(state, "Bad retry interval");

1099

fprintf(stderr, "Bad delay\n");

1100

exit(EXIT_FAILURE);

1395

1101

}

1396

1102

break;

1397

/*

1398

* These reproduce what we would get without ARGP_NO_HELP

1399

*/

1400

case '?': /* --help */

1401

argp_state_help(state, state->out_stream,

1402

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1403

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1404

case -3: /* --usage */

1405

argp_state_help(state, state->out_stream,

1406

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1407

case 'V': /* --version */

1408

fprintf(state->out_stream, "%s\n", argp_program_version);

1409

exit(argp_err_exit_status);

1103

case ARGP_KEY_ARG:

1104

argp_usage(state);

1105

case ARGP_KEY_END:

1410

1106

break;

1411

1107

default:

1412

1108

return ARGP_ERR_UNKNOWN;

1413

1109

}

1414

return errno;

1110

return 0;

1415

1111

}

1416

1112

1417

1113

struct argp argp = { .options = options, .parser = parse_opt,

1418

1114

.args_doc = "",

1419

1115

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

1420

1116

" passwords from a Mandos server" };

1421

ret = argp_parse(&argp, argc, argv,

1422

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1423

switch(ret){

1424

case 0:

1425

break;

1426

case ENOMEM:

1427

default:

1428

errno = ret;

1429

perror_plus("argp_parse");

1430

exitcode = EX_OSERR;

1431

goto end;

1432

case EINVAL:

1433

exitcode = EX_USAGE;

1434

goto end;

1435

}

1436

}

1437

1438

{

1439

/* Work around Debian bug #633582:

1440

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

1441

struct stat st;

1442

1443

/* Re-raise priviliges */

1444

errno = 0;

1445

ret = seteuid(0);

1446

if(ret == -1){

1447

perror_plus("seteuid");

1448

}

1449

1450

if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){

1451

int seckey_fd = open(seckey, O_RDONLY);

1452

if(seckey_fd == -1){

1453

perror_plus("open");

1454

} else {

1455

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

1456

if(ret == -1){

1457

perror_plus("fstat");

1458

} else {

1459

if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){

1460

ret = fchown(seckey_fd, uid, gid);

1461

if(ret == -1){

1462

perror_plus("fchown");

1463

}

1464

}

1465

}

1466

TEMP_FAILURE_RETRY(close(seckey_fd));

1467

}

1468

}

1469

1470

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

1471

int pubkey_fd = open(pubkey, O_RDONLY);

1472

if(pubkey_fd == -1){

1473

perror_plus("open");

1474

} else {

1475

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

1476

if(ret == -1){

1477

perror_plus("fstat");

1478

} else {

1479

if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){

1480

ret = fchown(pubkey_fd, uid, gid);

1481

if(ret == -1){

1482

perror_plus("fchown");

1483

}

1484

}

1485

}

1486

TEMP_FAILURE_RETRY(close(pubkey_fd));

1487

}

1488

}

1489

1490

/* Lower privileges */

1491

errno = 0;

1492

ret = seteuid(uid);

1493

if(ret == -1){

1494

perror_plus("seteuid");

1117

ret = argp_parse(&argp, argc, argv, 0, 0, NULL);

1118

if(ret == ARGP_ERR_UNKNOWN){

1119

fprintf(stderr, "Unknown error while parsing arguments\n");

1120

exitcode = EXIT_FAILURE;

1121

goto end;

1495

1122

}

1496

1123

}

1497

1124

1498

1125

if(not debug){

1499

1126

avahi_set_log_function(empty_log);

1500

1127

}

1501

1502

if(interface[0] == '\0'){

1503

struct dirent **direntries;

1504

ret = scandir(sys_class_net, &direntries, good_interface,

1505

alphasort);

1506

if(ret >= 1){

1507

/* Pick the first good interface */

1508

interface = strdup(direntries[0]->d_name);

1509

if(debug){

1510

fprintf(stderr, "Using interface \"%s\"\n", interface);

1511

}

1512

if(interface == NULL){

1513

perror_plus("malloc");

1514

free(direntries);

1515

exitcode = EXIT_FAILURE;

1516

goto end;

1517

}

1518

free(direntries);

1519

} else {

1520

free(direntries);

1521

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

1522

exitcode = EXIT_FAILURE;

1523

goto end;

1524

}

1525

}

1526

1128

1527

1129

/* Initialize Avahi early so avahi_simple_poll_quit() can be called

1528

1130

from the signal handler */

1531

1133

mc.simple_poll = avahi_simple_poll_new();

1532

1134

if(mc.simple_poll == NULL){

1533

1135

fprintf(stderr, "Avahi: Failed to create simple poll object.\n");

1534

exitcode = EX_UNAVAILABLE;

1136

exitcode = EXIT_FAILURE;

1535

1137

goto end;

1536

1138

}

1537

1139

1538

1140

sigemptyset(&sigterm_action.sa_mask);

1539

1141

ret = sigaddset(&sigterm_action.sa_mask, SIGINT);

1540

1142

if(ret == -1){

1541

perror_plus("sigaddset");

1542

exitcode = EX_OSERR;

1143

perror("sigaddset");

1144

exitcode = EXIT_FAILURE;

1543

1145

goto end;

1544

1146

}

1545

1147

ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);

1546

1148

if(ret == -1){

1547

perror_plus("sigaddset");

1548

exitcode = EX_OSERR;

1149

perror("sigaddset");

1150

exitcode = EXIT_FAILURE;

1549

1151

goto end;

1550

1152

}

1551

1153

ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);

1552

1154

if(ret == -1){

1553

perror_plus("sigaddset");

1554

exitcode = EX_OSERR;

1155

perror("sigaddset");

1156

exitcode = EXIT_FAILURE;

1555

1157

goto end;

1556

1158

}

1557

1159

/* Need to check if the handler is SIG_IGN before handling:

1560

1162

*/

1561

1163

ret = sigaction(SIGINT, NULL, &old_sigterm_action);

1562

1164

if(ret == -1){

1563

perror_plus("sigaction");

1564

return EX_OSERR;

1165

perror("sigaction");

1166

return EXIT_FAILURE;

1565

1167

}

1566

1168

if(old_sigterm_action.sa_handler != SIG_IGN){

1567

1169

ret = sigaction(SIGINT, &sigterm_action, NULL);

1568

1170

if(ret == -1){

1569

perror_plus("sigaction");

1570

exitcode = EX_OSERR;

1171

perror("sigaction");

1172

exitcode = EXIT_FAILURE;

1571

1173

goto end;

1572

1174

}

1573

1175

}

1574

1176

ret = sigaction(SIGHUP, NULL, &old_sigterm_action);

1575

1177

if(ret == -1){

1576

perror_plus("sigaction");

1577

return EX_OSERR;

1178

perror("sigaction");

1179

return EXIT_FAILURE;

1578

1180

}

1579

1181

if(old_sigterm_action.sa_handler != SIG_IGN){

1580

1182

ret = sigaction(SIGHUP, &sigterm_action, NULL);

1581

1183

if(ret == -1){

1582

perror_plus("sigaction");

1583

exitcode = EX_OSERR;

1184

perror("sigaction");

1185

exitcode = EXIT_FAILURE;

1584

1186

goto end;

1585

1187

}

1586

1188

}

1587

1189

ret = sigaction(SIGTERM, NULL, &old_sigterm_action);

1588

1190

if(ret == -1){

1589

perror_plus("sigaction");

1590

return EX_OSERR;

1191

perror("sigaction");

1192

return EXIT_FAILURE;

1591

1193

}

1592

1194

if(old_sigterm_action.sa_handler != SIG_IGN){

1593

1195

ret = sigaction(SIGTERM, &sigterm_action, NULL);

1594

1196

if(ret == -1){

1595

perror_plus("sigaction");

1596

exitcode = EX_OSERR;

1197

perror("sigaction");

1198

exitcode = EXIT_FAILURE;

1597

1199

goto end;

1598

1200

}

1599

1201

}

1600

1202

1601

1203

/* If the interface is down, bring it up */

1602

if(strcmp(interface, "none") != 0){

1204

if(interface[0] != '\0'){

1603

1205

if_index = (AvahiIfIndex) if_nametoindex(interface);

1604

1206

if(if_index == 0){

1605

1207

fprintf(stderr, "No such interface: \"%s\"\n", interface);

1606

exitcode = EX_UNAVAILABLE;

1208

exitcode = EXIT_FAILURE;

1607

1209

goto end;

1608

1210

}

1609

1211

1615

1217

errno = 0;

1616

1218

ret = seteuid(0);

1617

1219

if(ret == -1){

1618

perror_plus("seteuid");

1220

perror("seteuid");

1619

1221

}

1620

1222

1621

1223

#ifdef __linux__

1622

1224

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1623

messages about the network interface to mess up the prompt */

1225

messages to mess up the prompt */

1624

1226

ret = klogctl(8, NULL, 5);

1625

1227

bool restore_loglevel = true;

1626

1228

if(ret == -1){

1627

1229

restore_loglevel = false;

1628

perror_plus("klogctl");

1230

perror("klogctl");

1629

1231

}

1630

1232

#endif /* __linux__ */

1631

1233

1632

1234

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1633

1235

if(sd < 0){

1634

perror_plus("socket");

1635

exitcode = EX_OSERR;

1236

perror("socket");

1237

exitcode = EXIT_FAILURE;

1636

1238

#ifdef __linux__

1637

1239

if(restore_loglevel){

1638

1240

ret = klogctl(7, NULL, 0);

1639

1241

if(ret == -1){

1640

perror_plus("klogctl");

1242

perror("klogctl");

1641

1243

}

1642

1244

}

1643

1245

#endif /* __linux__ */

1645

1247

errno = 0;

1646

1248

ret = seteuid(uid);

1647

1249

if(ret == -1){

1648

perror_plus("seteuid");

1250

perror("seteuid");

1649

1251

}

1650

1252

goto end;

1651

1253

}

1652

1254

strcpy(network.ifr_name, interface);

1653

1255

ret = ioctl(sd, SIOCGIFFLAGS, &network);

1654

1256

if(ret == -1){

1655

perror_plus("ioctl SIOCGIFFLAGS");

1257

perror("ioctl SIOCGIFFLAGS");

1656

1258

#ifdef __linux__

1657

1259

if(restore_loglevel){

1658

1260

ret = klogctl(7, NULL, 0);

1659

1261

if(ret == -1){

1660

perror_plus("klogctl");

1262

perror("klogctl");

1661

1263

}

1662

1264

}

1663

1265

#endif /* __linux__ */

1664

exitcode = EX_OSERR;

1266

exitcode = EXIT_FAILURE;

1665

1267

/* Lower privileges */

1666

1268

errno = 0;

1667

1269

ret = seteuid(uid);

1668

1270

if(ret == -1){

1669

perror_plus("seteuid");

1271

perror("seteuid");

1670

1272

}

1671

1273

goto end;

1672

1274

}

1676

1278

ret = ioctl(sd, SIOCSIFFLAGS, &network);

1677

1279

if(ret == -1){

1678

1280

take_down_interface = false;

1679

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1680

exitcode = EX_OSERR;

1281

perror("ioctl SIOCSIFFLAGS");

1282

exitcode = EXIT_FAILURE;

1681

1283

#ifdef __linux__

1682

1284

if(restore_loglevel){

1683

1285

ret = klogctl(7, NULL, 0);

1684

1286

if(ret == -1){

1685

perror_plus("klogctl");

1287

perror("klogctl");

1686

1288

}

1687

1289

}

1688

1290

#endif /* __linux__ */

1690

1292

errno = 0;

1691

1293

ret = seteuid(uid);

1692

1294

if(ret == -1){

1693

perror_plus("seteuid");

1295

perror("seteuid");

1694

1296

}

1695

1297

goto end;

1696

1298

}

1697

1299

}

1698

/* Sleep checking until interface is running.

1699

Check every 0.25s, up to total time of delay */

1300

/* sleep checking until interface is running */

1700

1301

for(int i=0; i < delay * 4; i++){

1701

1302

ret = ioctl(sd, SIOCGIFFLAGS, &network);

1702

1303

if(ret == -1){

1703

perror_plus("ioctl SIOCGIFFLAGS");

1304

perror("ioctl SIOCGIFFLAGS");

1704

1305

} else if(network.ifr_flags & IFF_RUNNING){

1705

1306

break;

1706

1307

}

1707

1308

struct timespec sleeptime = { .tv_nsec = 250000000 };

1708

1309

ret = nanosleep(&sleeptime, NULL);

1709

1310

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

1710

perror_plus("nanosleep");

1311

perror("nanosleep");

1711

1312

}

1712

1313

}

1713

1314

if(not take_down_interface){

1714

1315

/* We won't need the socket anymore */

1715

1316

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

1716

1317

if(ret == -1){

1717

perror_plus("close");

1318

perror("close");

1718

1319

}

1719

1320

}

1720

1321

#ifdef __linux__

1722

1323

/* Restores kernel loglevel to default */

1723

1324

ret = klogctl(7, NULL, 0);

1724

1325

if(ret == -1){

1725

perror_plus("klogctl");

1326

perror("klogctl");

1726

1327

}

1727

1328

}

1728

1329

#endif /* __linux__ */

1732

1333

/* Lower privileges */

1733

1334

ret = seteuid(uid);

1734

1335

if(ret == -1){

1735

perror_plus("seteuid");

1336

perror("seteuid");

1736

1337

}

1737

1338

} else {

1738

1339

/* Lower privileges permanently */

1739

1340

ret = setuid(uid);

1740

1341

if(ret == -1){

1741

perror_plus("setuid");

1342

perror("setuid");

1742

1343

}

1743

1344

}

1744

1345

}

1750

1351

ret = init_gnutls_global(pubkey, seckey);

1751

1352

if(ret == -1){

1752

1353

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

1753

exitcode = EX_UNAVAILABLE;

1354

exitcode = EXIT_FAILURE;

1754

1355

goto end;

1755

1356

} else {

1756

1357

gnutls_initialized = true;

1760

1361

goto end;

1761

1362

}

1762

1363

1364

tempdir_created = true;

1763

1365

if(mkdtemp(tempdir) == NULL){

1764

perror_plus("mkdtemp");

1366

tempdir_created = false;

1367

perror("mkdtemp");

1765

1368

goto end;

1766

1369

}

1767

tempdir_created = true;

1768

1370

1769

1371

if(quit_now){

1770

1372

goto end;

1772

1374

1773

1375

if(not init_gpgme(pubkey, seckey, tempdir)){

1774

1376

fprintf(stderr, "init_gpgme failed\n");

1775

exitcode = EX_UNAVAILABLE;

1377

exitcode = EXIT_FAILURE;

1776

1378

goto end;

1777

1379

} else {

1778

1380

gpgme_initialized = true;

1788

1390

char *address = strrchr(connect_to, ':');

1789

1391

if(address == NULL){

1790

1392

fprintf(stderr, "No colon in address\n");

1791

exitcode = EX_USAGE;

1393

exitcode = EXIT_FAILURE;

1792

1394

goto end;

1793

1395

}

1794

1396

1802

1404

if(errno != 0 or tmp == address+1 or *tmp != '\0'

1803

1405

or tmpmax != (uint16_t)tmpmax){

1804

1406

fprintf(stderr, "Bad port number\n");

1805

exitcode = EX_USAGE;

1407

exitcode = EXIT_FAILURE;

1806

1408

goto end;

1807

1409

}

1808

1410

1812

1414

1813

1415

port = (uint16_t)tmpmax;

1814

1416

*address = '\0';

1417

address = connect_to;

1815

1418

/* Colon in address indicates IPv6 */

1816

1419

int af;

1817

if(strchr(connect_to, ':') != NULL){

1420

if(strchr(address, ':') != NULL){

1818

1421

af = AF_INET6;

1819

/* Accept [] around IPv6 address - see RFC 5952 */

1820

if(connect_to[0] == '[' and address[-1] == ']')

1821

{

1822

connect_to++;

1823

address[-1] = '\0';

1824

}

1825

1422

} else {

1826

1423

af = AF_INET;

1827

1424

}

1828

address = connect_to;

1829

1425

1830

1426

if(quit_now){

1831

1427

goto end;

1832

1428

}

1833

1429

1834

while(not quit_now){

1835

ret = start_mandos_communication(address, port, if_index, af);

1836

if(quit_now or ret == 0){

1837

break;

1838

}

1839

if(debug){

1840

fprintf(stderr, "Retrying in %d seconds\n",

1841

(int)retry_interval);

1842

}

1843

sleep((int)retry_interval);

1844

}

1845

1846

if (not quit_now){

1430

ret = start_mandos_communication(address, port, if_index, af);

1431

if(ret < 0){

1432

exitcode = EXIT_FAILURE;

1433

} else {

1847

1434

exitcode = EXIT_SUCCESS;

1848

1435

}

1849

1850

1436

goto end;

1851

1437

}

1852

1438

1876

1462

if(mc.server == NULL){

1877

1463

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

1878

1464

avahi_strerror(error));

1879

exitcode = EX_UNAVAILABLE;

1465

exitcode = EXIT_FAILURE;

1880

1466

goto end;

1881

1467

}

1882

1468

1891

1477

if(sb == NULL){

1892

1478

fprintf(stderr, "Failed to create service browser: %s\n",

1893

1479

avahi_strerror(avahi_server_errno(mc.server)));

1894

exitcode = EX_UNAVAILABLE;

1480

exitcode = EXIT_FAILURE;

1895

1481

goto end;

1896

1482

}

1897

1483

1904

1490

if(debug){

1905

1491

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

1906

1492

}

1907

1908

ret = avahi_loop_with_timeout(mc.simple_poll,

1909

(int)(retry_interval * 1000));

1910

if(debug){

1911

fprintf(stderr, "avahi_loop_with_timeout exited %s\n",

1912

(ret == 0) ? "successfully" : "with error");

1913

}

1493

1494

avahi_simple_poll_loop(mc.simple_poll);

1914

1495

1915

1496

end:

1916

1497

1937

1518

if(gpgme_initialized){

1938

1519

gpgme_release(mc.ctx);

1939

1520

}

1940

1941

/* Cleans up the circular linked list of Mandos servers the client

1942

has seen */

1943

if(mc.current_server != NULL){

1944

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

1945

while(mc.current_server != NULL){

1946

server *next = mc.current_server->next;

1947

free(mc.current_server);

1948

mc.current_server = next;

1949

}

1950

}

1951

1521

1952

1522

/* Take down the network interface */

1953

1523

if(take_down_interface){

1955

1525

errno = 0;

1956

1526

ret = seteuid(0);

1957

1527

if(ret == -1){

1958

perror_plus("seteuid");

1528

perror("seteuid");

1959

1529

}

1960

1530

if(geteuid() == 0){

1961

1531

ret = ioctl(sd, SIOCGIFFLAGS, &network);

1962

1532

if(ret == -1){

1963

perror_plus("ioctl SIOCGIFFLAGS");

1533

perror("ioctl SIOCGIFFLAGS");

1964

1534

} else if(network.ifr_flags & IFF_UP) {

1965

network.ifr_flags &= ~(short)IFF_UP; /* clear flag */

1535

network.ifr_flags &= ~IFF_UP; /* clear flag */

1966

1536

ret = ioctl(sd, SIOCSIFFLAGS, &network);

1967

1537

if(ret == -1){

1968

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1538

perror("ioctl SIOCSIFFLAGS");

1969

1539

}

1970

1540

}

1971

1541

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

1972

1542

if(ret == -1){

1973

perror_plus("close");

1543

perror("close");

1974

1544

}

1975

1545

/* Lower privileges permanently */

1976

1546

errno = 0;

1977

1547

ret = setuid(uid);

1978

1548

if(ret == -1){

1979

perror_plus("setuid");

1549

perror("setuid");

1980

1550

}

1981

1551

}

1982

1552

}

1983

1553

1984

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

1554

/* Removes the temp directory used by GPGME */

1985

1555

if(tempdir_created){

1986

struct dirent **direntries = NULL;

1987

struct dirent *direntry = NULL;

1988

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

1989

alphasort);

1990

if (numentries > 0){

1991

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

1992

direntry = direntries[i];

1556

DIR *d;

1557

struct dirent *direntry;

1558

d = opendir(tempdir);

1559

if(d == NULL){

1560

if(errno != ENOENT){

1561

perror("opendir");

1562

}

1563

} else {

1564

while(true){

1565

direntry = readdir(d);

1566

if(direntry == NULL){

1567

break;

1568

}

1569

/* Skip "." and ".." */

1570

if(direntry->d_name[0] == '.'

1571

and (direntry->d_name[1] == '\0'

1572

or (direntry->d_name[1] == '.'

1573

and direntry->d_name[2] == '\0'))){

1574

continue;

1575

}

1993

1576

char *fullname = NULL;

1994

1577

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

1995

1578

direntry->d_name);

1996

1579

if(ret < 0){

1997

perror_plus("asprintf");

1580

perror("asprintf");

1998

1581

continue;

1999

1582

}

2000

1583

ret = remove(fullname);

2004

1587

}

2005

1588

free(fullname);

2006

1589

}

2007

}

2008

2009

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

2010

free(direntries);

2011

if (numentries == -1){

2012

perror_plus("scandir");

1590

closedir(d);

2013

1591

}

2014

1592

ret = rmdir(tempdir);

2015

1593

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

2016

perror_plus("rmdir");

1594

perror("rmdir");

2017

1595

}

2018

1596

}

2019

1597

2020

1598

if(quit_now){

2021

1599

sigemptyset(&old_sigterm_action.sa_mask);

2022

1600

old_sigterm_action.sa_handler = SIG_DFL;

2023

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

2024

&old_sigterm_action,

2025

NULL));

1601

ret = sigaction(signal_received, &old_sigterm_action, NULL);

2026

1602

if(ret == -1){

2027

perror_plus("sigaction");

2028

}

2029

do {

2030

ret = raise(signal_received);

2031

} while(ret != 0 and errno == EINTR);

2032

if(ret != 0){

2033

perror_plus("raise");

2034

abort();

2035

}

2036

TEMP_FAILURE_RETRY(pause());

1603

perror("sigaction");

1604

}

1605

raise(signal_received);

2037

1606

}

2038

1607

2039

1608

return exitcode;