/mandos/release : revision 24.1.186

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, EXIT_FAILURE,

47

srand(), strtof(), abort() */

46

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

47

strtof(), abort() */

48

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

49

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

50

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

62

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

63

strtoimax() */

64

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

65

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

66

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

65

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

66

program_invocation_short_name */

67

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

67

68

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

68

69

SIOCSIFFLAGS, if_indextoname(),

69

70

if_nametoindex(), IF_NAMESIZE */

73

74

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

74

75

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

75

76

setgid(), pause() */

76

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

77

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

77

78

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

78

79

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

79

80

argp_state, struct argp,

82

83

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

83

84

sigaction(), SIGTERM, sig_atomic_t,

84

85

raise() */

86

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

87

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

85

88

86

89

#ifdef __linux__

87

90

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

128

131

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

129

132

char *connect_to = NULL;

130

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;

144

131

145

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

132

146

typedef struct {

133

147

AvahiSimplePoll *simple_poll;

137

151

gnutls_dh_params_t dh_params;

138

152

const char *priority;

139

153

gpgme_ctx_t ctx;

154

server *current_server;

140

155

} mandos_context;

141

156

142

157

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

143

158

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

144

159

.dh_bits = 1024, .priority = "SECURE256"

145

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

160

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

161

.current_server = NULL };

146

162

147

163

sig_atomic_t quit_now = 0;

148

164

int signal_received = 0;

149

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

}

172

150

173

/*

151

174

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

152

175

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

164

187

return buffer_capacity;

165

188

}

166

189

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

167

228

/*

168

229

* Initialize GPGME.

169

230

*/

183

244

184

245

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

185

246

if(fd == -1){

186

perror("open");

247

perror_plus("open");

187

248

return false;

188

249

}

189

250

203

264

204

265

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

205

266

if(ret == -1){

206

perror("close");

267

perror_plus("close");

207

268

}

208

269

gpgme_data_release(pgp_data);

209

270

return true;

222

283

return false;

223

284

}

224

285

225

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

286

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

226

287

rc = gpgme_get_engine_info(&engine_info);

227

288

if(rc != GPG_ERR_NO_ERROR){

228

289

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

334

395

335

396

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

336

397

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

337

perror("gpgme_data_seek");

398

perror_plus("gpgme_data_seek");

338

399

plaintext_length = -1;

339

400

goto decrypt_end;

340

401

}

345

406

(size_t)plaintext_length,

346

407

plaintext_capacity);

347

408

if(plaintext_capacity == 0){

348

perror("incbuffer");

409

perror_plus("incbuffer");

349

410

plaintext_length = -1;

350

411

goto decrypt_end;

351

412

}

358

419

break;

359

420

}

360

421

if(ret < 0){

361

perror("gpgme_data_read");

422

perror_plus("gpgme_data_read");

362

423

plaintext_length = -1;

363

424

goto decrypt_end;

364

425

}

421

482

}

422

483

423

484

/* OpenPGP credentials */

424

gnutls_certificate_allocate_credentials(&mc.cred);

485

ret = gnutls_certificate_allocate_credentials(&mc.cred);

425

486

if(ret != GNUTLS_E_SUCCESS){

426

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

427

from

428

-Wunreachable-code

429

*/

487

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

430

488

safer_gnutls_strerror(ret));

431

489

gnutls_global_deinit();

432

490

return -1;

554

612

gnutls_session_t session;

555

613

int pf; /* Protocol family */

556

614

615

errno = 0;

616

557

617

if(quit_now){

618

errno = EINTR;

558

619

return -1;

559

620

}

560

621

567

628

break;

568

629

default:

569

630

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

631

errno = EINVAL;

570

632

return -1;

571

633

}

572

634

582

644

583

645

tcp_sd = socket(pf, SOCK_STREAM, 0);

584

646

if(tcp_sd < 0){

585

perror("socket");

647

int e = errno;

648

perror_plus("socket");

649

errno = e;

586

650

goto mandos_end;

587

651

}

588

652

589

653

if(quit_now){

654

errno = EINTR;

590

655

goto mandos_end;

591

656

}

592

657

599

664

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

600

665

}

601

666

if(ret < 0 ){

602

perror("inet_pton");

667

int e = errno;

668

perror_plus("inet_pton");

669

errno = e;

603

670

goto mandos_end;

604

671

}

605

672

if(ret == 0){

673

int e = errno;

606

674

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

675

errno = e;

607

676

goto mandos_end;

608

677

}

609

678

if(af == AF_INET6){

617

686

if(if_index == AVAHI_IF_UNSPEC){

618

687

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

619

688

" without a network interface\n");

689

errno = EINVAL;

620

690

goto mandos_end;

621

691

}

622

692

/* Set the network interface number as scope */

629

699

}

630

700

631

701

if(quit_now){

702

errno = EINTR;

632

703

goto mandos_end;

633

704

}

634

705

636

707

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

637

708

char interface[IF_NAMESIZE];

638

709

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

639

perror("if_indextoname");

710

perror_plus("if_indextoname");

640

711

} else {

641

712

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

642

713

ip, interface, port);

656

727

sizeof(addrstr));

657

728

}

658

729

if(pcret == NULL){

659

perror("inet_ntop");

730

perror_plus("inet_ntop");

660

731

} else {

661

732

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

662

733

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

665

736

}

666

737

667

738

if(quit_now){

739

errno = EINTR;

668

740

goto mandos_end;

669

741

}

670

742

674

746

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

675

747

}

676

748

if(ret < 0){

677

perror("connect");

749

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

750

int e = errno;

751

perror_plus("connect");

752

errno = e;

753

}

678

754

goto mandos_end;

679

755

}

680

756

681

757

if(quit_now){

758

errno = EINTR;

682

759

goto mandos_end;

683

760

}

684

761

689

766

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

690

767

out_size - written));

691

768

if(ret == -1){

692

perror("write");

769

int e = errno;

770

perror_plus("write");

771

errno = e;

693

772

goto mandos_end;

694

773

}

695

774

written += (size_t)ret;

705

784

}

706

785

707

786

if(quit_now){

787

errno = EINTR;

708

788

goto mandos_end;

709

789

}

710

790

}

714

794

}

715

795

716

796

if(quit_now){

797

errno = EINTR;

717

798

goto mandos_end;

718

799

}

719

800

801

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

720

802

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

721

803

722

804

if(quit_now){

805

errno = EINTR;

723

806

goto mandos_end;

724

807

}

725

808

726

809

do {

727

810

ret = gnutls_handshake(session);

728

811

if(quit_now){

812

errno = EINTR;

729

813

goto mandos_end;

730

814

}

731

815

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

735

819

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

736

820

gnutls_perror(ret);

737

821

}

822

errno = EPROTO;

738

823

goto mandos_end;

739

824

}

740

825

748

833

while(true){

749

834

750

835

if(quit_now){

836

errno = EINTR;

751

837

goto mandos_end;

752

838

}

753

839

754

840

buffer_capacity = incbuffer(&buffer, buffer_length,

755

841

buffer_capacity);

756

842

if(buffer_capacity == 0){

757

perror("incbuffer");

843

int e = errno;

844

perror_plus("incbuffer");

845

errno = e;

758

846

goto mandos_end;

759

847

}

760

848

761

849

if(quit_now){

850

errno = EINTR;

762

851

goto mandos_end;

763

852

}

764

853

777

866

ret = gnutls_handshake(session);

778

867

779

868

if(quit_now){

869

errno = EINTR;

780

870

goto mandos_end;

781

871

}

782

872

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

783

873

if(ret < 0){

784

874

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

785

875

gnutls_perror(ret);

876

errno = EPROTO;

786

877

goto mandos_end;

787

878

}

788

879

break;

790

881

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

791

882

" encrypted session with Mandos server\n");

792

883

gnutls_bye(session, GNUTLS_SHUT_RDWR);

884

errno = EIO;

793

885

goto mandos_end;

794

886

}

795

887

} else {

802

894

}

803

895

804

896

if(quit_now){

897

errno = EINTR;

805

898

goto mandos_end;

806

899

}

807

900

808

901

do {

809

902

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

810

903

if(quit_now){

904

errno = EINTR;

811

905

goto mandos_end;

812

906

}

813

907

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

822

916

written = 0;

823

917

while(written < (size_t) decrypted_buffer_size){

824

918

if(quit_now){

919

errno = EINTR;

825

920

goto mandos_end;

826

921

}

827

922

829

924

(size_t)decrypted_buffer_size - written,

830

925

stdout);

831

926

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

927

int e = errno;

832

928

if(debug){

833

929

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

834

930

strerror(errno));

835

931

}

932

errno = e;

836

933

goto mandos_end;

837

934

}

838

935

written += (size_t)ret;

844

941

/* Shutdown procedure */

845

942

846

943

mandos_end:

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;

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

}

858

963

}

859

964

return retval;

860

965

}

903

1008

avahi_proto_to_af(proto));

904

1009

if(ret == 0){

905

1010

avahi_simple_poll_quit(mc.simple_poll);

1011

} else {

1012

ret = add_server(ip, port, interface,

1013

avahi_proto_to_af(proto));

906

1014

}

907

1015

}

908

1016

}

962

1070

}

963

1071

}

964

1072

965

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

1073

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

966

1074

static void handle_sigterm(int sig){

967

1075

if(quit_now){

968

1076

return;

970

1078

quit_now = 1;

971

1079

signal_received = sig;

972

1080

int old_errno = errno;

1081

/* set main loop to exit */

973

1082

if(mc.simple_poll != NULL){

974

1083

avahi_simple_poll_quit(mc.simple_poll);

975

1084

}

984

1093

int good_interface(const struct dirent *if_entry){

985

1094

ssize_t ssret;

986

1095

char *flagname = NULL;

1096

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

1097

return 0;

1098

}

987

1099

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

988

1100

if_entry->d_name);

989

1101

if(ret < 0){

990

perror("asprintf");

991

return 0;

992

}

993

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

1102

perror_plus("asprintf");

994

1103

return 0;

995

1104

}

996

1105

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

997

1106

if(flags_fd == -1){

998

perror("open");

1107

perror_plus("open");

1108

free(flagname);

999

1109

return 0;

1000

1110

}

1111

free(flagname);

1001

1112

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

1002

1113

/* read line from flags_fd */

1003

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

1114

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

1004

1115

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

1005

1116

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

1006

1117

if(flagstring == NULL){

1007

perror("malloc");

1118

perror_plus("malloc");

1008

1119

close(flags_fd);

1009

1120

return 0;

1010

1121

}

1012

1123

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

1013

1124

(size_t)to_read));

1014

1125

if(ssret == -1){

1015

perror("read");

1126

perror_plus("read");

1016

1127

free(flagstring);

1017

1128

close(flags_fd);

1018

1129

return 0;

1063

1174

}

1064

1175

return 0;

1065

1176

}

1177

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

1178

if(flags & IFF_NOARP){

1179

if(debug){

1180

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

1181

if_entry->d_name);

1182

}

1183

return 0;

1184

}

1066

1185

/* Accept this device */

1067

1186

if(debug){

1068

1187

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

1071

1190

return 1;

1072

1191

}

1073

1192

1193

int notdotentries(const struct dirent *direntry){

1194

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

1195

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

1196

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

1197

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

1198

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

1199

return 0;

1200

}

1201

return 1;

1202

}

1203

1204

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1205

int ret;

1206

struct timespec now;

1207

struct timespec waited_time;

1208

intmax_t block_time;

1209

1210

while(true){

1211

if(mc.current_server == NULL){

1212

if (debug){

1213

fprintf(stderr,

1214

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

1215

}

1216

ret = avahi_simple_poll_iterate(s, -1);

1217

} else {

1218

if (debug){

1219

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

1220

" or wait\n");

1221

}

1222

/* the current time */

1223

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1224

if(ret == -1){

1225

perror_plus("clock_gettime");

1226

return -1;

1227

}

1228

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

1229

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

1230

waited_time.tv_sec = (now.tv_sec

1231

- mc.current_server->last_seen.tv_sec);

1232

waited_time.tv_nsec = (now.tv_nsec

1233

- mc.current_server->last_seen.tv_nsec);

1234

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

1235

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

1236

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

1237

block_time = ((retry_interval

1238

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

1239

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

1240

1241

if (debug){

1242

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

1243

}

1244

1245

if(block_time <= 0){

1246

ret = start_mandos_communication(mc.current_server->ip,

1247

mc.current_server->port,

1248

mc.current_server->if_index,

1249

mc.current_server->af);

1250

if(ret == 0){

1251

avahi_simple_poll_quit(mc.simple_poll);

1252

return 0;

1253

}

1254

ret = clock_gettime(CLOCK_MONOTONIC,

1255

&mc.current_server->last_seen);

1256

if(ret == -1){

1257

perror_plus("clock_gettime");

1258

return -1;

1259

}

1260

mc.current_server = mc.current_server->next;

1261

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

1262

servers, but don't block */

1263

}

1264

1265

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

1266

}

1267

if(ret != 0){

1268

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

1269

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

1270

}

1271

}

1272

}

1273

}

1274

1074

1275

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

1075

1276

AvahiSServiceBrowser *sb = NULL;

1076

1277

int error;

1093

1294

bool gnutls_initialized = false;

1094

1295

bool gpgme_initialized = false;

1095

1296

float delay = 2.5f;

1297

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

1298

retrying the same server again */

1096

1299

1097

1300

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1098

1301

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1104

1307

errno = 0;

1105

1308

ret = setgid(gid);

1106

1309

if(ret == -1){

1107

perror("setgid");

1310

perror_plus("setgid");

1108

1311

}

1109

1312

1110

1313

/* Lower user privileges (temporarily) */

1111

1314

errno = 0;

1112

1315

ret = seteuid(uid);

1113

1316

if(ret == -1){

1114

perror("seteuid");

1317

perror_plus("seteuid");

1115

1318

}

1116

1319

1117

1320

if(quit_now){

1152

1355

.arg = "SECONDS",

1153

1356

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

1154

1357

.group = 2 },

1358

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

1359

.arg = "SECONDS",

1360

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

1361

.group = 2 },

1362

/*

1363

* These reproduce what we would get without ARGP_NO_HELP

1364

*/

1365

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

1366

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

1367

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

1368

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

1369

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

1370

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

1155

1371

{ .name = NULL }

1156

1372

};

1157

1373

1158

1374

error_t parse_opt(int key, char *arg,

1159

1375

struct argp_state *state){

1376

errno = 0;

1160

1377

switch(key){

1161

1378

case 128: /* --debug */

1162

1379

debug = true;

1178

1395

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

1179

1396

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

1180

1397

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

1181

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

1182

exit(EXIT_FAILURE);

1398

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

1183

1399

}

1184

1400

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

1185

1401

break;

1190

1406

errno = 0;

1191

1407

delay = strtof(arg, &tmp);

1192

1408

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

1193

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

1194

exit(EXIT_FAILURE);

1409

argp_error(state, "Bad delay");

1410

}

1411

case 132: /* --retry */

1412

errno = 0;

1413

retry_interval = strtod(arg, &tmp);

1414

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

1415

or (retry_interval * 1000) > INT_MAX

1416

or retry_interval < 0){

1417

argp_error(state, "Bad retry interval");

1195

1418

}

1196

1419

break;

1197

case ARGP_KEY_ARG:

1198

argp_usage(state);

1199

case ARGP_KEY_END:

1420

/*

1421

* These reproduce what we would get without ARGP_NO_HELP

1422

*/

1423

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

1424

argp_state_help(state, state->out_stream,

1425

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1426

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1427

case -3: /* --usage */

1428

argp_state_help(state, state->out_stream,

1429

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1430

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

1431

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

1432

exit(argp_err_exit_status);

1200

1433

break;

1201

1434

default:

1202

1435

return ARGP_ERR_UNKNOWN;

1203

1436

}

1204

return 0;

1437

return errno;

1205

1438

}

1206

1439

1207

1440

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

1208

1441

.args_doc = "",

1209

1442

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

1210

1443

" passwords from a Mandos server" };

1211

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

1212

if(ret == ARGP_ERR_UNKNOWN){

1213

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

1214

exitcode = EXIT_FAILURE;

1215

goto end;

1444

ret = argp_parse(&argp, argc, argv,

1445

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1446

switch(ret){

1447

case 0:

1448

break;

1449

case ENOMEM:

1450

default:

1451

errno = ret;

1452

perror_plus("argp_parse");

1453

exitcode = EX_OSERR;

1454

goto end;

1455

case EINVAL:

1456

exitcode = EX_USAGE;

1457

goto end;

1458

}

1459

}

1460

1461

{

1462

/* Work around Debian bug #633582:

1463

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

1464

struct stat st;

1465

1466

/* Re-raise priviliges */

1467

errno = 0;

1468

ret = seteuid(0);

1469

if(ret == -1){

1470

perror_plus("seteuid");

1471

}

1472

1473

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

1474

int seckey_fd = open(seckey, O_RDONLY);

1475

if(seckey_fd == -1){

1476

perror_plus("open");

1477

} else {

1478

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

1479

if(ret == -1){

1480

perror_plus("fstat");

1481

} else {

1482

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

1483

ret = fchown(seckey_fd, uid, gid);

1484

if(ret == -1){

1485

perror_plus("fchown");

1486

}

1487

}

1488

}

1489

TEMP_FAILURE_RETRY(close(seckey_fd));

1490

}

1491

}

1492

1493

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

1494

int pubkey_fd = open(pubkey, O_RDONLY);

1495

if(pubkey_fd == -1){

1496

perror_plus("open");

1497

} else {

1498

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

1499

if(ret == -1){

1500

perror_plus("fstat");

1501

} else {

1502

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

1503

ret = fchown(pubkey_fd, uid, gid);

1504

if(ret == -1){

1505

perror_plus("fchown");

1506

}

1507

}

1508

}

1509

TEMP_FAILURE_RETRY(close(pubkey_fd));

1510

}

1511

}

1512

1513

/* Lower privileges */

1514

errno = 0;

1515

ret = seteuid(uid);

1516

if(ret == -1){

1517

perror_plus("seteuid");

1216

1518

}

1217

1519

}

1218

1520

1231

1533

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

1232

1534

}

1233

1535

if(interface == NULL){

1234

perror("malloc");

1536

perror_plus("malloc");

1235

1537

free(direntries);

1236

1538

exitcode = EXIT_FAILURE;

1237

1539

goto end;

1252

1554

mc.simple_poll = avahi_simple_poll_new();

1253

1555

if(mc.simple_poll == NULL){

1254

1556

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

1255

exitcode = EXIT_FAILURE;

1557

exitcode = EX_UNAVAILABLE;

1256

1558

goto end;

1257

1559

}

1258

1560

1259

1561

sigemptyset(&sigterm_action.sa_mask);

1260

1562

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

1261

1563

if(ret == -1){

1262

perror("sigaddset");

1263

exitcode = EXIT_FAILURE;

1564

perror_plus("sigaddset");

1565

exitcode = EX_OSERR;

1264

1566

goto end;

1265

1567

}

1266

1568

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

1267

1569

if(ret == -1){

1268

perror("sigaddset");

1269

exitcode = EXIT_FAILURE;

1570

perror_plus("sigaddset");

1571

exitcode = EX_OSERR;

1270

1572

goto end;

1271

1573

}

1272

1574

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

1273

1575

if(ret == -1){

1274

perror("sigaddset");

1275

exitcode = EXIT_FAILURE;

1576

perror_plus("sigaddset");

1577

exitcode = EX_OSERR;

1276

1578

goto end;

1277

1579

}

1278

1580

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

1281

1583

*/

1282

1584

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

1283

1585

if(ret == -1){

1284

perror("sigaction");

1285

return EXIT_FAILURE;

1586

perror_plus("sigaction");

1587

return EX_OSERR;

1286

1588

}

1287

1589

if(old_sigterm_action.sa_handler != SIG_IGN){

1288

1590

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

1289

1591

if(ret == -1){

1290

perror("sigaction");

1291

exitcode = EXIT_FAILURE;

1592

perror_plus("sigaction");

1593

exitcode = EX_OSERR;

1292

1594

goto end;

1293

1595

}

1294

1596

}

1295

1597

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

1296

1598

if(ret == -1){

1297

perror("sigaction");

1298

return EXIT_FAILURE;

1599

perror_plus("sigaction");

1600

return EX_OSERR;

1299

1601

}

1300

1602

if(old_sigterm_action.sa_handler != SIG_IGN){

1301

1603

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

1302

1604

if(ret == -1){

1303

perror("sigaction");

1304

exitcode = EXIT_FAILURE;

1605

perror_plus("sigaction");

1606

exitcode = EX_OSERR;

1305

1607

goto end;

1306

1608

}

1307

1609

}

1308

1610

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

1309

1611

if(ret == -1){

1310

perror("sigaction");

1311

return EXIT_FAILURE;

1612

perror_plus("sigaction");

1613

return EX_OSERR;

1312

1614

}

1313

1615

if(old_sigterm_action.sa_handler != SIG_IGN){

1314

1616

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

1315

1617

if(ret == -1){

1316

perror("sigaction");

1317

exitcode = EXIT_FAILURE;

1618

perror_plus("sigaction");

1619

exitcode = EX_OSERR;

1318

1620

goto end;

1319

1621

}

1320

1622

}

1324

1626

if_index = (AvahiIfIndex) if_nametoindex(interface);

1325

1627

if(if_index == 0){

1326

1628

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

1327

exitcode = EXIT_FAILURE;

1629

exitcode = EX_UNAVAILABLE;

1328

1630

goto end;

1329

1631

}

1330

1632

1336

1638

errno = 0;

1337

1639

ret = seteuid(0);

1338

1640

if(ret == -1){

1339

perror("seteuid");

1641

perror_plus("seteuid");

1340

1642

}

1341

1643

1342

1644

#ifdef __linux__

1343

1645

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1344

messages to mess up the prompt */

1646

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

1345

1647

ret = klogctl(8, NULL, 5);

1346

1648

bool restore_loglevel = true;

1347

1649

if(ret == -1){

1348

1650

restore_loglevel = false;

1349

perror("klogctl");

1651

perror_plus("klogctl");

1350

1652

}

1351

1653

#endif /* __linux__ */

1352

1654

1353

1655

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1354

1656

if(sd < 0){

1355

perror("socket");

1356

exitcode = EXIT_FAILURE;

1657

perror_plus("socket");

1658

exitcode = EX_OSERR;

1357

1659

#ifdef __linux__

1358

1660

if(restore_loglevel){

1359

1661

ret = klogctl(7, NULL, 0);

1360

1662

if(ret == -1){

1361

perror("klogctl");

1663

perror_plus("klogctl");

1362

1664

}

1363

1665

}

1364

1666

#endif /* __linux__ */

1366

1668

errno = 0;

1367

1669

ret = seteuid(uid);

1368

1670

if(ret == -1){

1369

perror("seteuid");

1671

perror_plus("seteuid");

1370

1672

}

1371

1673

goto end;

1372

1674

}

1373

1675

strcpy(network.ifr_name, interface);

1374

1676

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

1375

1677

if(ret == -1){

1376

perror("ioctl SIOCGIFFLAGS");

1678

perror_plus("ioctl SIOCGIFFLAGS");

1377

1679

#ifdef __linux__

1378

1680

if(restore_loglevel){

1379

1681

ret = klogctl(7, NULL, 0);

1380

1682

if(ret == -1){

1381

perror("klogctl");

1683

perror_plus("klogctl");

1382

1684

}

1383

1685

}

1384

1686

#endif /* __linux__ */

1385

exitcode = EXIT_FAILURE;

1687

exitcode = EX_OSERR;

1386

1688

/* Lower privileges */

1387

1689

errno = 0;

1388

1690

ret = seteuid(uid);

1389

1691

if(ret == -1){

1390

perror("seteuid");

1692

perror_plus("seteuid");

1391

1693

}

1392

1694

goto end;

1393

1695

}

1397

1699

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

1398

1700

if(ret == -1){

1399

1701

take_down_interface = false;

1400

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1401

exitcode = EXIT_FAILURE;

1702

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1703

exitcode = EX_OSERR;

1402

1704

#ifdef __linux__

1403

1705

if(restore_loglevel){

1404

1706

ret = klogctl(7, NULL, 0);

1405

1707

if(ret == -1){

1406

perror("klogctl");

1708

perror_plus("klogctl");

1407

1709

}

1408

1710

}

1409

1711

#endif /* __linux__ */

1411

1713

errno = 0;

1412

1714

ret = seteuid(uid);

1413

1715

if(ret == -1){

1414

perror("seteuid");

1716

perror_plus("seteuid");

1415

1717

}

1416

1718

goto end;

1417

1719

}

1418

1720

}

1419

/* sleep checking until interface is running */

1721

/* Sleep checking until interface is running.

1722

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

1420

1723

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

1421

1724

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

1422

1725

if(ret == -1){

1423

perror("ioctl SIOCGIFFLAGS");

1726

perror_plus("ioctl SIOCGIFFLAGS");

1424

1727

} else if(network.ifr_flags & IFF_RUNNING){

1425

1728

break;

1426

1729

}

1427

1730

struct timespec sleeptime = { .tv_nsec = 250000000 };

1428

1731

ret = nanosleep(&sleeptime, NULL);

1429

1732

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

1430

perror("nanosleep");

1733

perror_plus("nanosleep");

1431

1734

}

1432

1735

}

1433

1736

if(not take_down_interface){

1434

1737

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

1435

1738

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

1436

1739

if(ret == -1){

1437

perror("close");

1740

perror_plus("close");

1438

1741

}

1439

1742

}

1440

1743

#ifdef __linux__

1442

1745

/* Restores kernel loglevel to default */

1443

1746

ret = klogctl(7, NULL, 0);

1444

1747

if(ret == -1){

1445

perror("klogctl");

1748

perror_plus("klogctl");

1446

1749

}

1447

1750

}

1448

1751

#endif /* __linux__ */

1452

1755

/* Lower privileges */

1453

1756

ret = seteuid(uid);

1454

1757

if(ret == -1){

1455

perror("seteuid");

1758

perror_plus("seteuid");

1456

1759

}

1457

1760

} else {

1458

1761

/* Lower privileges permanently */

1459

1762

ret = setuid(uid);

1460

1763

if(ret == -1){

1461

perror("setuid");

1764

perror_plus("setuid");

1462

1765

}

1463

1766

}

1464

1767

}

1470

1773

ret = init_gnutls_global(pubkey, seckey);

1471

1774

if(ret == -1){

1472

1775

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

1473

exitcode = EXIT_FAILURE;

1776

exitcode = EX_UNAVAILABLE;

1474

1777

goto end;

1475

1778

} else {

1476

1779

gnutls_initialized = true;

1480

1783

goto end;

1481

1784

}

1482

1785

1786

if(mkdtemp(tempdir) == NULL){

1787

perror_plus("mkdtemp");

1788

goto end;

1789

}

1483

1790

tempdir_created = true;

1484

if(mkdtemp(tempdir) == NULL){

1485

tempdir_created = false;

1486

perror("mkdtemp");

1487

goto end;

1488

}

1489

1791

1490

1792

if(quit_now){

1491

1793

goto end;

1493

1795

1494

1796

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

1495

1797

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

1496

exitcode = EXIT_FAILURE;

1798

exitcode = EX_UNAVAILABLE;

1497

1799

goto end;

1498

1800

} else {

1499

1801

gpgme_initialized = true;

1509

1811

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

1510

1812

if(address == NULL){

1511

1813

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

1512

exitcode = EXIT_FAILURE;

1814

exitcode = EX_USAGE;

1513

1815

goto end;

1514

1816

}

1515

1817

1523

1825

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

1524

1826

or tmpmax != (uint16_t)tmpmax){

1525

1827

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

1526

exitcode = EXIT_FAILURE;

1828

exitcode = EX_USAGE;

1527

1829

goto end;

1528

1830

}

1529

1831

1533

1835

1534

1836

port = (uint16_t)tmpmax;

1535

1837

*address = '\0';

1536

address = connect_to;

1537

1838

/* Colon in address indicates IPv6 */

1538

1839

int af;

1539

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

1840

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

1540

1841

af = AF_INET6;

1842

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

1843

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

1844

{

1845

connect_to++;

1846

address[-1] = '\0';

1847

}

1541

1848

} else {

1542

1849

af = AF_INET;

1543

1850

}

1851

address = connect_to;

1544

1852

1545

1853

if(quit_now){

1546

1854

goto end;

1547

1855

}

1548

1856

1549

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

1550

if(ret < 0){

1551

exitcode = EXIT_FAILURE;

1552

} else {

1857

while(not quit_now){

1858

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

1859

if(quit_now or ret == 0){

1860

break;

1861

}

1862

if(debug){

1863

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

1864

(int)retry_interval);

1865

}

1866

sleep((int)retry_interval);

1867

}

1868

1869

if (not quit_now){

1553

1870

exitcode = EXIT_SUCCESS;

1554

1871

}

1872

1555

1873

goto end;

1556

1874

}

1557

1875

1581

1899

if(mc.server == NULL){

1582

1900

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

1583

1901

avahi_strerror(error));

1584

exitcode = EXIT_FAILURE;

1902

exitcode = EX_UNAVAILABLE;

1585

1903

goto end;

1586

1904

}

1587

1905

1596

1914

if(sb == NULL){

1597

1915

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

1598

1916

avahi_strerror(avahi_server_errno(mc.server)));

1599

exitcode = EXIT_FAILURE;

1917

exitcode = EX_UNAVAILABLE;

1600

1918

goto end;

1601

1919

}

1602

1920

1609

1927

if(debug){

1610

1928

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

1611

1929

}

1612

1613

avahi_simple_poll_loop(mc.simple_poll);

1930

1931

ret = avahi_loop_with_timeout(mc.simple_poll,

1932

(int)(retry_interval * 1000));

1933

if(debug){

1934

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

1935

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

1936

}

1614

1937

1615

1938

end:

1616

1939

1637

1960

if(gpgme_initialized){

1638

1961

gpgme_release(mc.ctx);

1639

1962

}

1963

1964

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

1965

has seen */

1966

if(mc.current_server != NULL){

1967

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

1968

while(mc.current_server != NULL){

1969

server *next = mc.current_server->next;

1970

free(mc.current_server);

1971

mc.current_server = next;

1972

}

1973

}

1640

1974

1641

1975

/* Take down the network interface */

1642

1976

if(take_down_interface){

1644

1978

errno = 0;

1645

1979

ret = seteuid(0);

1646

1980

if(ret == -1){

1647

perror("seteuid");

1981

perror_plus("seteuid");

1648

1982

}

1649

1983

if(geteuid() == 0){

1650

1984

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

1651

1985

if(ret == -1){

1652

perror("ioctl SIOCGIFFLAGS");

1986

perror_plus("ioctl SIOCGIFFLAGS");

1653

1987

} else if(network.ifr_flags & IFF_UP) {

1654

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

1988

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

1655

1989

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

1656

1990

if(ret == -1){

1657

perror("ioctl SIOCSIFFLAGS -IFF_UP");

1991

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1658

1992

}

1659

1993

}

1660

1994

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

1661

1995

if(ret == -1){

1662

perror("close");

1996

perror_plus("close");

1663

1997

}

1664

1998

/* Lower privileges permanently */

1665

1999

errno = 0;

1666

2000

ret = setuid(uid);

1667

2001

if(ret == -1){

1668

perror("setuid");

2002

perror_plus("setuid");

1669

2003

}

1670

2004

}

1671

2005

}

1672

2006

1673

/* Removes the temp directory used by GPGME */

2007

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

1674

2008

if(tempdir_created){

1675

DIR *d;

1676

struct dirent *direntry;

1677

d = opendir(tempdir);

1678

if(d == NULL){

1679

if(errno != ENOENT){

1680

perror("opendir");

1681

}

1682

} else {

1683

while(true){

1684

direntry = readdir(d);

1685

if(direntry == NULL){

1686

break;

1687

}

1688

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

1689

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

1690

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

1691

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

1692

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

1693

continue;

1694

}

2009

struct dirent **direntries = NULL;

2010

struct dirent *direntry = NULL;

2011

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

2012

alphasort);

2013

if (numentries > 0){

2014

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

2015

direntry = direntries[i];

1695

2016

char *fullname = NULL;

1696

2017

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

1697

2018

direntry->d_name);

1698

2019

if(ret < 0){

1699

perror("asprintf");

2020

perror_plus("asprintf");

1700

2021

continue;

1701

2022

}

1702

2023

ret = remove(fullname);

1706

2027

}

1707

2028

free(fullname);

1708

2029

}

1709

closedir(d);

2030

}

2031

2032

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

2033

free(direntries);

2034

if (numentries == -1){

2035

perror_plus("scandir");

1710

2036

}

1711

2037

ret = rmdir(tempdir);

1712

2038

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

1713

perror("rmdir");

2039

perror_plus("rmdir");

1714

2040

}

1715

2041

}

1716

2042

1721

2047

&old_sigterm_action,

1722

2048

NULL));

1723

2049

if(ret == -1){

1724

perror("sigaction");

2050

perror_plus("sigaction");

1725

2051

}

1726

2052

do {

1727

2053

ret = raise(signal_received);

1728

2054

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

1729

2055

if(ret != 0){

1730

perror("raise");

2056

perror_plus("raise");

1731

2057

abort();

1732

2058

}

1733

2059

TEMP_FAILURE_RETRY(pause());