/mandos/release : revision 269.1.1

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

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(), abort() */

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 */

74

73

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

75

74

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

76

75

setgid(), pause() */

77

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

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() */

131

128

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

132

129

char *connect_to = NULL;

133

130

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;

144

145

131

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

146

132

typedef struct {

147

133

AvahiSimplePoll *simple_poll;

151

137

gnutls_dh_params_t dh_params;

152

138

const char *priority;

153

139

gpgme_ctx_t ctx;

154

server *current_server;

155

140

} mandos_context;

156

141

157

142

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

158

143

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

159

144

.dh_bits = 1024, .priority = "SECURE256"

160

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

161

.current_server = NULL };

145

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

162

146

163

147

sig_atomic_t quit_now = 0;

164

148

int signal_received = 0;

165

149

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

}

172

173

150

/*

174

151

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

175

152

* bytes. "buffer_capacity" is how much is currently allocated,

187

164

return buffer_capacity;

188

165

}

189

166

190

int add_server(const char *ip, uint16_t port,

191

AvahiIfIndex if_index,

192

int af){

193

int ret;

194

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

195

if(new_server == NULL){

196

perror_plus("malloc");

197

return -1;

198

}

199

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

200

.port = port,

201

.if_index = if_index,

202

.af = af };

203

if(new_server->ip == NULL){

204

perror_plus("strdup");

205

return -1;

206

}

207

/* unique case of first server */

208

if (mc.current_server == NULL){

209

new_server->next = new_server;

210

new_server->prev = new_server;

211

mc.current_server = new_server;

212

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

213

} else {

214

new_server->next = mc.current_server;

215

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

216

new_server->prev->next = new_server;

217

mc.current_server->prev = new_server;

218

}

219

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

220

if(ret == -1){

221

perror_plus("clock_gettime");

222

return -1;

223

}

224

return 0;

225

}

226

227

167

/*

228

168

* Initialize GPGME.

229

169

*/

243

183

244

184

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

245

185

if(fd == -1){

246

perror_plus("open");

186

perror("open");

247

187

return false;

248

188

}

249

189

263

203

264

204

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

265

205

if(ret == -1){

266

perror_plus("close");

206

perror("close");

267

207

}

268

208

gpgme_data_release(pgp_data);

269

209

return true;

394

334

395

335

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

396

336

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

397

perror_plus("gpgme_data_seek");

337

perror("gpgme_data_seek");

398

338

plaintext_length = -1;

399

339

goto decrypt_end;

400

340

}

405

345

(size_t)plaintext_length,

406

346

plaintext_capacity);

407

347

if(plaintext_capacity == 0){

408

perror_plus("incbuffer");

348

perror("incbuffer");

409

349

plaintext_length = -1;

410

350

goto decrypt_end;

411

351

}

418

358

break;

419

359

}

420

360

if(ret < 0){

421

perror_plus("gpgme_data_read");

361

perror("gpgme_data_read");

422

362

plaintext_length = -1;

423

363

goto decrypt_end;

424

364

}

481

421

}

482

422

483

423

/* OpenPGP credentials */

484

ret = gnutls_certificate_allocate_credentials(&mc.cred);

424

gnutls_certificate_allocate_credentials(&mc.cred);

485

425

if(ret != GNUTLS_E_SUCCESS){

486

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

426

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

427

from

428

-Wunreachable-code

429

*/

487

430

safer_gnutls_strerror(ret));

488

431

gnutls_global_deinit();

489

432

return -1;

611

554

gnutls_session_t session;

612

555

int pf; /* Protocol family */

613

556

614

errno = 0;

615

616

557

if(quit_now){

617

errno = EINTR;

618

558

return -1;

619

559

}

620

560

627

567

break;

628

568

default:

629

569

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

630

errno = EINVAL;

631

570

return -1;

632

571

}

633

572

643

582

644

583

tcp_sd = socket(pf, SOCK_STREAM, 0);

645

584

if(tcp_sd < 0){

646

int e = errno;

647

perror_plus("socket");

648

errno = e;

585

perror("socket");

649

586

goto mandos_end;

650

587

}

651

588

652

589

if(quit_now){

653

errno = EINTR;

654

590

goto mandos_end;

655

591

}

656

592

663

599

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

664

600

}

665

601

if(ret < 0 ){

666

int e = errno;

667

perror_plus("inet_pton");

668

errno = e;

602

perror("inet_pton");

669

603

goto mandos_end;

670

604

}

671

605

if(ret == 0){

672

int e = errno;

673

606

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

674

errno = e;

675

607

goto mandos_end;

676

608

}

677

609

if(af == AF_INET6){

685

617

if(if_index == AVAHI_IF_UNSPEC){

686

618

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

687

619

" without a network interface\n");

688

errno = EINVAL;

689

620

goto mandos_end;

690

621

}

691

622

/* Set the network interface number as scope */

698

629

}

699

630

700

631

if(quit_now){

701

errno = EINTR;

702

632

goto mandos_end;

703

633

}

704

634

706

636

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

707

637

char interface[IF_NAMESIZE];

708

638

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

709

perror_plus("if_indextoname");

639

perror("if_indextoname");

710

640

} else {

711

641

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

712

642

ip, interface, port);

726

656

sizeof(addrstr));

727

657

}

728

658

if(pcret == NULL){

729

perror_plus("inet_ntop");

659

perror("inet_ntop");

730

660

} else {

731

661

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

732

662

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

735

665

}

736

666

737

667

if(quit_now){

738

errno = EINTR;

739

668

goto mandos_end;

740

669

}

741

670

745

674

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

746

675

}

747

676

if(ret < 0){

748

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

749

int e = errno;

750

perror_plus("connect");

751

errno = e;

752

}

677

perror("connect");

753

678

goto mandos_end;

754

679

}

755

680

756

681

if(quit_now){

757

errno = EINTR;

758

682

goto mandos_end;

759

683

}

760

684

765

689

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

766

690

out_size - written));

767

691

if(ret == -1){

768

int e = errno;

769

perror_plus("write");

770

errno = e;

692

perror("write");

771

693

goto mandos_end;

772

694

}

773

695

written += (size_t)ret;

783

705

}

784

706

785

707

if(quit_now){

786

errno = EINTR;

787

708

goto mandos_end;

788

709

}

789

710

}

793

714

}

794

715

795

716

if(quit_now){

796

errno = EINTR;

797

717

goto mandos_end;

798

718

}

799

719

800

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

801

720

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

802

721

803

722

if(quit_now){

804

errno = EINTR;

805

723

goto mandos_end;

806

724

}

807

725

808

726

do {

809

727

ret = gnutls_handshake(session);

810

728

if(quit_now){

811

errno = EINTR;

812

729

goto mandos_end;

813

730

}

814

731

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

818

735

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

819

736

gnutls_perror(ret);

820

737

}

821

errno = EPROTO;

822

738

goto mandos_end;

823

739

}

824

740

832

748

while(true){

833

749

834

750

if(quit_now){

835

errno = EINTR;

836

751

goto mandos_end;

837

752

}

838

753

839

754

buffer_capacity = incbuffer(&buffer, buffer_length,

840

755

buffer_capacity);

841

756

if(buffer_capacity == 0){

842

int e = errno;

843

perror_plus("incbuffer");

844

errno = e;

757

perror("incbuffer");

845

758

goto mandos_end;

846

759

}

847

760

848

761

if(quit_now){

849

errno = EINTR;

850

762

goto mandos_end;

851

763

}

852

764

865

777

ret = gnutls_handshake(session);

866

778

867

779

if(quit_now){

868

errno = EINTR;

869

780

goto mandos_end;

870

781

}

871

782

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

872

783

if(ret < 0){

873

784

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

874

785

gnutls_perror(ret);

875

errno = EPROTO;

876

786

goto mandos_end;

877

787

}

878

788

break;

880

790

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

881

791

" encrypted session with Mandos server\n");

882

792

gnutls_bye(session, GNUTLS_SHUT_RDWR);

883

errno = EIO;

884

793

goto mandos_end;

885

794

}

886

795

} else {

893

802

}

894

803

895

804

if(quit_now){

896

errno = EINTR;

897

805

goto mandos_end;

898

806

}

899

807

900

808

do {

901

809

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

902

810

if(quit_now){

903

errno = EINTR;

904

811

goto mandos_end;

905

812

}

906

813

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

915

822

written = 0;

916

823

while(written < (size_t) decrypted_buffer_size){

917

824

if(quit_now){

918

errno = EINTR;

919

825

goto mandos_end;

920

826

}

921

827

923

829

(size_t)decrypted_buffer_size - written,

924

830

stdout);

925

831

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

926

int e = errno;

927

832

if(debug){

928

833

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

929

834

strerror(errno));

930

835

}

931

errno = e;

932

836

goto mandos_end;

933

837

}

934

838

written += (size_t)ret;

940

844

/* Shutdown procedure */

941

845

942

846

mandos_end:

943

{

944

int e = errno;

945

free(decrypted_buffer);

946

free(buffer);

947

if(tcp_sd >= 0){

948

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

949

}

950

if(ret == -1){

951

if(e == 0){

952

e = errno;

953

}

954

perror_plus("close");

955

}

956

gnutls_deinit(session);

957

errno = e;

958

if(quit_now){

959

errno = EINTR;

960

retval = -1;

961

}

847

free(decrypted_buffer);

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;

962

858

}

963

859

return retval;

964

860

}

1007

903

avahi_proto_to_af(proto));

1008

904

if(ret == 0){

1009

905

avahi_simple_poll_quit(mc.simple_poll);

1010

} else {

1011

ret = add_server(ip, port, interface,

1012

avahi_proto_to_af(proto));

1013

906

}

1014

907

}

1015

908

}

1069

962

}

1070

963

}

1071

964

1072

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

965

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

1073

966

static void handle_sigterm(int sig){

1074

967

if(quit_now){

1075

968

return;

1077

970

quit_now = 1;

1078

971

signal_received = sig;

1079

972

int old_errno = errno;

1080

/* set main loop to exit */

1081

973

if(mc.simple_poll != NULL){

1082

974

avahi_simple_poll_quit(mc.simple_poll);

1083

975

}

1092

984

int good_interface(const struct dirent *if_entry){

1093

985

ssize_t ssret;

1094

986

char *flagname = NULL;

1095

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

1096

return 0;

1097

}

1098

987

int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,

1099

988

if_entry->d_name);

1100

989

if(ret < 0){

1101

perror_plus("asprintf");

990

perror("asprintf");

991

return 0;

992

}

993

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

1102

994

return 0;

1103

995

}

1104

996

int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));

1105

997

if(flags_fd == -1){

1106

perror_plus("open");

1107

free(flagname);

998

perror("open");

1108

999

return 0;

1109

1000

}

1110

free(flagname);

1111

1001

typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */

1112

1002

/* read line from flags_fd */

1113

ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */

1114

char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */

1115

flagstring[(size_t)to_read] = '\0';

1003

ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */

1004

char *flagstring = malloc((size_t)to_read);

1116

1005

if(flagstring == NULL){

1117

perror_plus("malloc");

1006

perror("malloc");

1118

1007

close(flags_fd);

1119

1008

return 0;

1120

1009

}

1122

1011

ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,

1123

1012

(size_t)to_read));

1124

1013

if(ssret == -1){

1125

perror_plus("read");

1014

perror("read");

1126

1015

free(flagstring);

1127

1016

close(flags_fd);

1128

1017

return 0;

1140

1029

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

1141

1030

and not (isspace(*tmp)))

1142

1031

or tmpmax != (ifreq_flags)tmpmax){

1143

if(debug){

1144

fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",

1145

flagstring, if_entry->d_name);

1146

}

1147

1032

free(flagstring);

1148

1033

return 0;

1149

1034

}

1151

1036

ifreq_flags flags = (ifreq_flags)tmpmax;

1152

1037

/* Reject the loopback device */

1153

1038

if(flags & IFF_LOOPBACK){

1154

if(debug){

1155

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

1156

if_entry->d_name);

1157

}

1158

1039

return 0;

1159

1040

}

1160

1041

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

1161

1042

if(connect_to != NULL and (flags & IFF_POINTOPOINT)){

1162

if(debug){

1163

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

1164

if_entry->d_name);

1165

}

1166

1043

return 1;

1167

1044

}

1168

1045

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

1169

1046

if(not (flags & IFF_BROADCAST)){

1170

if(debug){

1171

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

1172

if_entry->d_name);

1173

}

1174

return 0;

1175

}

1176

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

1177

if(flags & IFF_NOARP){

1178

if(debug){

1179

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

1180

if_entry->d_name);

1181

}

1182

1047

return 0;

1183

1048

}

1184

1049

/* Accept this device */

1185

if(debug){

1186

fprintf(stderr, "Interface \"%s\" is acceptable\n",

1187

if_entry->d_name);

1188

}

1189

return 1;

1190

}

1191

1192

int notdotentries(const struct dirent *direntry){

1193

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

1194

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

1195

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

1196

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

1197

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

1198

return 0;

1199

}

1200

return 1;

1201

}

1202

1203

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1204

int ret;

1205

struct timespec now;

1206

struct timespec waited_time;

1207

intmax_t block_time;

1208

1209

while(true){

1210

if(mc.current_server == NULL){

1211

if (debug){

1212

fprintf(stderr,

1213

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

1214

}

1215

ret = avahi_simple_poll_iterate(s, -1);

1216

} else {

1217

if (debug){

1218

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

1219

" or wait\n");

1220

}

1221

/* the current time */

1222

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1223

if(ret == -1){

1224

perror_plus("clock_gettime");

1225

return -1;

1226

}

1227

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

1228

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

1229

waited_time.tv_sec = (now.tv_sec

1230

- mc.current_server->last_seen.tv_sec);

1231

waited_time.tv_nsec = (now.tv_nsec

1232

- mc.current_server->last_seen.tv_nsec);

1233

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

1234

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

1235

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

1236

block_time = ((retry_interval

1237

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

1238

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

1239

1240

if (debug){

1241

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

1242

}

1243

1244

if(block_time <= 0){

1245

ret = start_mandos_communication(mc.current_server->ip,

1246

mc.current_server->port,

1247

mc.current_server->if_index,

1248

mc.current_server->af);

1249

if(ret == 0){

1250

avahi_simple_poll_quit(mc.simple_poll);

1251

return 0;

1252

}

1253

ret = clock_gettime(CLOCK_MONOTONIC,

1254

&mc.current_server->last_seen);

1255

if(ret == -1){

1256

perror_plus("clock_gettime");

1257

return -1;

1258

}

1259

mc.current_server = mc.current_server->next;

1260

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

1261

servers, but don't block */

1262

}

1263

1264

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

1265

}

1266

if(ret != 0){

1267

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

1268

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

1269

}

1270

}

1271

}

1050

return 1;

1272

1051

}

1273

1052

1274

1053

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

1293

1072

bool gnutls_initialized = false;

1294

1073

bool gpgme_initialized = false;

1295

1074

float delay = 2.5f;

1296

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

1297

retrying the same server again */

1298

1075

1299

1076

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1300

1077

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1306

1083

errno = 0;

1307

1084

ret = setgid(gid);

1308

1085

if(ret == -1){

1309

perror_plus("setgid");

1086

perror("setgid");

1310

1087

}

1311

1088

1312

1089

/* Lower user privileges (temporarily) */

1313

1090

errno = 0;

1314

1091

ret = seteuid(uid);

1315

1092

if(ret == -1){

1316

perror_plus("seteuid");

1093

perror("seteuid");

1317

1094

}

1318

1095

1319

1096

if(quit_now){

1354

1131

.arg = "SECONDS",

1355

1132

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

1356

1133

.group = 2 },

1357

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

1358

.arg = "SECONDS",

1359

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

1360

.group = 2 },

1361

/*

1362

* These reproduce what we would get without ARGP_NO_HELP

1363

*/

1364

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

1365

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

1366

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

1367

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

1368

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

1369

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

1370

1134

{ .name = NULL }

1371

1135

};

1372

1136

1373

1137

error_t parse_opt(int key, char *arg,

1374

1138

struct argp_state *state){

1375

errno = 0;

1376

1139

switch(key){

1377

1140

case 128: /* --debug */

1378

1141

debug = true;

1394

1157

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

1395

1158

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

1396

1159

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

1397

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

1160

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

1161

exit(EXIT_FAILURE);

1398

1162

}

1399

1163

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

1400

1164

break;

1405

1169

errno = 0;

1406

1170

delay = strtof(arg, &tmp);

1407

1171

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

1408

argp_error(state, "Bad delay");

1409

}

1410

case 132: /* --retry */

1411

errno = 0;

1412

retry_interval = strtod(arg, &tmp);

1413

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

1414

or (retry_interval * 1000) > INT_MAX){

1415

argp_error(state, "Bad retry interval");

1172

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

1173

exit(EXIT_FAILURE);

1416

1174

}

1417

1175

break;

1418

/*

1419

* These reproduce what we would get without ARGP_NO_HELP

1420

*/

1421

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

1422

argp_state_help(state, state->out_stream,

1423

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1424

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1425

case -3: /* --usage */

1426

argp_state_help(state, state->out_stream,

1427

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1428

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

1429

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

1430

exit(argp_err_exit_status);

1176

case ARGP_KEY_ARG:

1177

argp_usage(state);

1178

case ARGP_KEY_END:

1431

1179

break;

1432

1180

default:

1433

1181

return ARGP_ERR_UNKNOWN;

1434

1182

}

1435

return errno;

1183

return 0;

1436

1184

}

1437

1185

1438

1186

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

1439

1187

.args_doc = "",

1440

1188

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

1441

1189

" passwords from a Mandos server" };

1442

ret = argp_parse(&argp, argc, argv,

1443

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1444

switch(ret){

1445

case 0:

1446

break;

1447

case ENOMEM:

1448

default:

1449

errno = ret;

1450

perror_plus("argp_parse");

1451

exitcode = EX_OSERR;

1452

goto end;

1453

case EINVAL:

1454

exitcode = EX_USAGE;

1455

goto end;

1456

}

1457

}

1458

1459

{

1460

/* Work around Debian bug #633582:

1461

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

1462

struct stat st;

1463

1464

/* Re-raise priviliges */

1465

errno = 0;

1466

ret = seteuid(0);

1467

if(ret == -1){

1468

perror_plus("seteuid");

1469

}

1470

1471

int seckey_fd = open(PATHDIR "/" SECKEY, O_RDONLY);

1472

if(seckey_fd == -1){

1473

perror_plus("open");

1474

} else {

1475

ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_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(seckey_fd, uid, gid);

1481

if(ret == -1){

1482

perror_plus("fchown");

1483

}

1484

}

1485

}

1486

TEMP_FAILURE_RETRY(close(seckey_fd));

1487

}

1488

1489

int pubkey_fd = open(PATHDIR "/" PUBKEY, O_RDONLY);

1490

if(pubkey_fd == -1){

1491

perror_plus("open");

1492

} else {

1493

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

1494

if(ret == -1){

1495

perror_plus("fstat");

1496

} else {

1497

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

1498

ret = fchown(pubkey_fd, uid, gid);

1499

if(ret == -1){

1500

perror_plus("fchown");

1501

}

1502

}

1503

}

1504

TEMP_FAILURE_RETRY(close(pubkey_fd));

1505

}

1506

1507

/* Lower privileges */

1508

errno = 0;

1509

ret = seteuid(uid);

1510

if(ret == -1){

1511

perror_plus("seteuid");

1190

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

1191

if(ret == ARGP_ERR_UNKNOWN){

1192

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

1193

exitcode = EXIT_FAILURE;

1194

goto end;

1512

1195

}

1513

1196

}

1514

1197

1523

1206

if(ret >= 1){

1524

1207

/* Pick the first good interface */

1525

1208

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

1526

if(debug){

1527

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

1528

}

1529

1209

if(interface == NULL){

1530

perror_plus("malloc");

1210

perror("malloc");

1531

1211

free(direntries);

1532

1212

exitcode = EXIT_FAILURE;

1533

1213

goto end;

1548

1228

mc.simple_poll = avahi_simple_poll_new();

1549

1229

if(mc.simple_poll == NULL){

1550

1230

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

1551

exitcode = EX_UNAVAILABLE;

1231

exitcode = EXIT_FAILURE;

1552

1232

goto end;

1553

1233

}

1554

1234

1555

1235

sigemptyset(&sigterm_action.sa_mask);

1556

1236

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

1557

1237

if(ret == -1){

1558

perror_plus("sigaddset");

1559

exitcode = EX_OSERR;

1238

perror("sigaddset");

1239

exitcode = EXIT_FAILURE;

1560

1240

goto end;

1561

1241

}

1562

1242

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

1563

1243

if(ret == -1){

1564

perror_plus("sigaddset");

1565

exitcode = EX_OSERR;

1244

perror("sigaddset");

1245

exitcode = EXIT_FAILURE;

1566

1246

goto end;

1567

1247

}

1568

1248

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

1569

1249

if(ret == -1){

1570

perror_plus("sigaddset");

1571

exitcode = EX_OSERR;

1250

perror("sigaddset");

1251

exitcode = EXIT_FAILURE;

1572

1252

goto end;

1573

1253

}

1574

1254

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

1577

1257

*/

1578

1258

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

1579

1259

if(ret == -1){

1580

perror_plus("sigaction");

1581

return EX_OSERR;

1260

perror("sigaction");

1261

return EXIT_FAILURE;

1582

1262

}

1583

1263

if(old_sigterm_action.sa_handler != SIG_IGN){

1584

1264

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

1585

1265

if(ret == -1){

1586

perror_plus("sigaction");

1587

exitcode = EX_OSERR;

1266

perror("sigaction");

1267

exitcode = EXIT_FAILURE;

1588

1268

goto end;

1589

1269

}

1590

1270

}

1591

1271

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

1592

1272

if(ret == -1){

1593

perror_plus("sigaction");

1594

return EX_OSERR;

1273

perror("sigaction");

1274

return EXIT_FAILURE;

1595

1275

}

1596

1276

if(old_sigterm_action.sa_handler != SIG_IGN){

1597

1277

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

1598

1278

if(ret == -1){

1599

perror_plus("sigaction");

1600

exitcode = EX_OSERR;

1279

perror("sigaction");

1280

exitcode = EXIT_FAILURE;

1601

1281

goto end;

1602

1282

}

1603

1283

}

1604

1284

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

1605

1285

if(ret == -1){

1606

perror_plus("sigaction");

1607

return EX_OSERR;

1286

perror("sigaction");

1287

return EXIT_FAILURE;

1608

1288

}

1609

1289

if(old_sigterm_action.sa_handler != SIG_IGN){

1610

1290

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

1611

1291

if(ret == -1){

1612

perror_plus("sigaction");

1613

exitcode = EX_OSERR;

1292

perror("sigaction");

1293

exitcode = EXIT_FAILURE;

1614

1294

goto end;

1615

1295

}

1616

1296

}

1620

1300

if_index = (AvahiIfIndex) if_nametoindex(interface);

1621

1301

if(if_index == 0){

1622

1302

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

1623

exitcode = EX_UNAVAILABLE;

1303

exitcode = EXIT_FAILURE;

1624

1304

goto end;

1625

1305

}

1626

1306

1632

1312

errno = 0;

1633

1313

ret = seteuid(0);

1634

1314

if(ret == -1){

1635

perror_plus("seteuid");

1315

perror("seteuid");

1636

1316

}

1637

1317

1638

1318

#ifdef __linux__

1639

1319

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1640

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

1320

messages to mess up the prompt */

1641

1321

ret = klogctl(8, NULL, 5);

1642

1322

bool restore_loglevel = true;

1643

1323

if(ret == -1){

1644

1324

restore_loglevel = false;

1645

perror_plus("klogctl");

1325

perror("klogctl");

1646

1326

}

1647

1327

#endif /* __linux__ */

1648

1328

1649

1329

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1650

1330

if(sd < 0){

1651

perror_plus("socket");

1652

exitcode = EX_OSERR;

1331

perror("socket");

1332

exitcode = EXIT_FAILURE;

1653

1333

#ifdef __linux__

1654

1334

if(restore_loglevel){

1655

1335

ret = klogctl(7, NULL, 0);

1656

1336

if(ret == -1){

1657

perror_plus("klogctl");

1337

perror("klogctl");

1658

1338

}

1659

1339

}

1660

1340

#endif /* __linux__ */

1662

1342

errno = 0;

1663

1343

ret = seteuid(uid);

1664

1344

if(ret == -1){

1665

perror_plus("seteuid");

1345

perror("seteuid");

1666

1346

}

1667

1347

goto end;

1668

1348

}

1669

1349

strcpy(network.ifr_name, interface);

1670

1350

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

1671

1351

if(ret == -1){

1672

perror_plus("ioctl SIOCGIFFLAGS");

1352

perror("ioctl SIOCGIFFLAGS");

1673

1353

#ifdef __linux__

1674

1354

if(restore_loglevel){

1675

1355

ret = klogctl(7, NULL, 0);

1676

1356

if(ret == -1){

1677

perror_plus("klogctl");

1357

perror("klogctl");

1678

1358

}

1679

1359

}

1680

1360

#endif /* __linux__ */

1681

exitcode = EX_OSERR;

1361

exitcode = EXIT_FAILURE;

1682

1362

/* Lower privileges */

1683

1363

errno = 0;

1684

1364

ret = seteuid(uid);

1685

1365

if(ret == -1){

1686

perror_plus("seteuid");

1366

perror("seteuid");

1687

1367

}

1688

1368

goto end;

1689

1369

}

1693

1373

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

1694

1374

if(ret == -1){

1695

1375

take_down_interface = false;

1696

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1697

exitcode = EX_OSERR;

1376

perror("ioctl SIOCSIFFLAGS");

1377

exitcode = EXIT_FAILURE;

1698

1378

#ifdef __linux__

1699

1379

if(restore_loglevel){

1700

1380

ret = klogctl(7, NULL, 0);

1701

1381

if(ret == -1){

1702

perror_plus("klogctl");

1382

perror("klogctl");

1703

1383

}

1704

1384

}

1705

1385

#endif /* __linux__ */

1707

1387

errno = 0;

1708

1388

ret = seteuid(uid);

1709

1389

if(ret == -1){

1710

perror_plus("seteuid");

1390

perror("seteuid");

1711

1391

}

1712

1392

goto end;

1713

1393

}

1714

1394

}

1715

/* Sleep checking until interface is running.

1716

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

1395

/* sleep checking until interface is running */

1717

1396

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

1718

1397

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

1719

1398

if(ret == -1){

1720

perror_plus("ioctl SIOCGIFFLAGS");

1399

perror("ioctl SIOCGIFFLAGS");

1721

1400

} else if(network.ifr_flags & IFF_RUNNING){

1722

1401

break;

1723

1402

}

1724

1403

struct timespec sleeptime = { .tv_nsec = 250000000 };

1725

1404

ret = nanosleep(&sleeptime, NULL);

1726

1405

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

1727

perror_plus("nanosleep");

1406

perror("nanosleep");

1728

1407

}

1729

1408

}

1730

1409

if(not take_down_interface){

1731

1410

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

1732

1411

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

1733

1412

if(ret == -1){

1734

perror_plus("close");

1413

perror("close");

1735

1414

}

1736

1415

}

1737

1416

#ifdef __linux__

1739

1418

/* Restores kernel loglevel to default */

1740

1419

ret = klogctl(7, NULL, 0);

1741

1420

if(ret == -1){

1742

perror_plus("klogctl");

1421

perror("klogctl");

1743

1422

}

1744

1423

}

1745

1424

#endif /* __linux__ */

1749

1428

/* Lower privileges */

1750

1429

ret = seteuid(uid);

1751

1430

if(ret == -1){

1752

perror_plus("seteuid");

1431

perror("seteuid");

1753

1432

}

1754

1433

} else {

1755

1434

/* Lower privileges permanently */

1756

1435

ret = setuid(uid);

1757

1436

if(ret == -1){

1758

perror_plus("setuid");

1437

perror("setuid");

1759

1438

}

1760

1439

}

1761

1440

}

1767

1446

ret = init_gnutls_global(pubkey, seckey);

1768

1447

if(ret == -1){

1769

1448

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

1770

exitcode = EX_UNAVAILABLE;

1449

exitcode = EXIT_FAILURE;

1771

1450

goto end;

1772

1451

} else {

1773

1452

gnutls_initialized = true;

1777

1456

goto end;

1778

1457

}

1779

1458

1459

tempdir_created = true;

1780

1460

if(mkdtemp(tempdir) == NULL){

1781

perror_plus("mkdtemp");

1461

tempdir_created = false;

1462

perror("mkdtemp");

1782

1463

goto end;

1783

1464

}

1784

tempdir_created = true;

1785

1465

1786

1466

if(quit_now){

1787

1467

goto end;

1789

1469

1790

1470

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

1791

1471

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

1792

exitcode = EX_UNAVAILABLE;

1472

exitcode = EXIT_FAILURE;

1793

1473

goto end;

1794

1474

} else {

1795

1475

gpgme_initialized = true;

1805

1485

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

1806

1486

if(address == NULL){

1807

1487

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

1808

exitcode = EX_USAGE;

1488

exitcode = EXIT_FAILURE;

1809

1489

goto end;

1810

1490

}

1811

1491

1819

1499

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

1820

1500

or tmpmax != (uint16_t)tmpmax){

1821

1501

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

1822

exitcode = EX_USAGE;

1502

exitcode = EXIT_FAILURE;

1823

1503

goto end;

1824

1504

}

1825

1505

1841

1521

if(quit_now){

1842

1522

goto end;

1843

1523

}

1844

1845

while(not quit_now){

1846

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

1847

if(quit_now or ret == 0){

1848

break;

1849

}

1850

sleep((int)retry_interval or 1);

1851

};

1852

1853

if (not quit_now){

1524

1525

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

1526

if(ret < 0){

1527

exitcode = EXIT_FAILURE;

1528

} else {

1854

1529

exitcode = EXIT_SUCCESS;

1855

1530

}

1856

1857

1531

goto end;

1858

1532

}

1859

1533

1883

1557

if(mc.server == NULL){

1884

1558

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

1885

1559

avahi_strerror(error));

1886

exitcode = EX_UNAVAILABLE;

1560

exitcode = EXIT_FAILURE;

1887

1561

goto end;

1888

1562

}

1889

1563

1898

1572

if(sb == NULL){

1899

1573

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

1900

1574

avahi_strerror(avahi_server_errno(mc.server)));

1901

exitcode = EX_UNAVAILABLE;

1575

exitcode = EXIT_FAILURE;

1902

1576

goto end;

1903

1577

}

1904

1578

1911

1585

if(debug){

1912

1586

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

1913

1587

}

1914

1915

ret = avahi_loop_with_timeout(mc.simple_poll,

1916

(int)(retry_interval * 1000));

1917

if(debug){

1918

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

1919

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

1920

}

1588

1589

avahi_simple_poll_loop(mc.simple_poll);

1921

1590

1922

1591

end:

1923

1592

1944

1613

if(gpgme_initialized){

1945

1614

gpgme_release(mc.ctx);

1946

1615

}

1947

1948

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

1949

has seen */

1950

if(mc.current_server != NULL){

1951

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

1952

while(mc.current_server != NULL){

1953

server *next = mc.current_server->next;

1954

free(mc.current_server);

1955

mc.current_server = next;

1956

}

1957

}

1958

1616

1959

1617

/* Take down the network interface */

1960

1618

if(take_down_interface){

1962

1620

errno = 0;

1963

1621

ret = seteuid(0);

1964

1622

if(ret == -1){

1965

perror_plus("seteuid");

1623

perror("seteuid");

1966

1624

}

1967

1625

if(geteuid() == 0){

1968

1626

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

1969

1627

if(ret == -1){

1970

perror_plus("ioctl SIOCGIFFLAGS");

1628

perror("ioctl SIOCGIFFLAGS");

1971

1629

} else if(network.ifr_flags & IFF_UP) {

1972

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

1630

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

1973

1631

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

1974

1632

if(ret == -1){

1975

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1633

perror("ioctl SIOCSIFFLAGS");

1976

1634

}

1977

1635

}

1978

1636

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

1979

1637

if(ret == -1){

1980

perror_plus("close");

1638

perror("close");

1981

1639

}

1982

1640

/* Lower privileges permanently */

1983

1641

errno = 0;

1984

1642

ret = setuid(uid);

1985

1643

if(ret == -1){

1986

perror_plus("setuid");

1644

perror("setuid");

1987

1645

}

1988

1646

}

1989

1647

}

1990

1648

1991

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

1649

/* Removes the temp directory used by GPGME */

1992

1650

if(tempdir_created){

1993

struct dirent **direntries = NULL;

1994

struct dirent *direntry = NULL;

1995

ret = scandir(tempdir, &direntries, notdotentries, alphasort);

1996

if (ret > 0){

1997

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

1998

direntry = direntries[i];

1651

DIR *d;

1652

struct dirent *direntry;

1653

d = opendir(tempdir);

1654

if(d == NULL){

1655

if(errno != ENOENT){

1656

perror("opendir");

1657

}

1658

} else {

1659

while(true){

1660

direntry = readdir(d);

1661

if(direntry == NULL){

1662

break;

1663

}

1664

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

1665

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

1666

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

1667

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

1668

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

1669

continue;

1670

}

1999

1671

char *fullname = NULL;

2000

1672

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

2001

1673

direntry->d_name);

2002

1674

if(ret < 0){

2003

perror_plus("asprintf");

1675

perror("asprintf");

2004

1676

continue;

2005

1677

}

2006

1678

ret = remove(fullname);

2010

1682

}

2011

1683

free(fullname);

2012

1684

}

2013

}

2014

2015

/* need to be cleaned even if ret == 0 because man page doesn't

2016

specify */

2017

free(direntries);

2018

if (ret == -1){

2019

perror_plus("scandir");

1685

closedir(d);

2020

1686

}

2021

1687

ret = rmdir(tempdir);

2022

1688

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

2023

perror_plus("rmdir");

1689

perror("rmdir");

2024

1690

}

2025

1691

}

2026

1692

2031

1697

&old_sigterm_action,

2032

1698

NULL));

2033

1699

if(ret == -1){

2034

perror_plus("sigaction");

1700

perror("sigaction");

2035

1701

}

2036

1702

do {

2037

1703

ret = raise(signal_received);

2038

1704

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

2039

1705

if(ret != 0){

2040

perror_plus("raise");

1706

perror("raise");

2041

1707

abort();

2042

1708

}

2043

1709

TEMP_FAILURE_RETRY(pause());