/mandos/trunk : revision 397

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 */

85

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

88

86

89

87

#ifdef __linux__

90

88

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

128

126

static const char mandos_protocol_version[] = "1";

129

127

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

130

128

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

144

129

145

130

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

146

131

typedef struct {

151

136

gnutls_dh_params_t dh_params;

152

137

const char *priority;

153

138

gpgme_ctx_t ctx;

154

server *current_server;

155

139

} mandos_context;

156

140

157

141

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

158

142

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

159

143

.dh_bits = 1024, .priority = "SECURE256"

160

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

161

.current_server = NULL };

144

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

162

145

163

146

sig_atomic_t quit_now = 0;

164

147

int signal_received = 0;

165

148

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

149

/*

174

150

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

175

151

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

187

163

return buffer_capacity;

188

164

}

189

165

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

166

/*

228

167

* Initialize GPGME.

229

168

*/

243

182

244

183

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

245

184

if(fd == -1){

246

perror_plus("open");

185

perror("open");

247

186

return false;

248

187

}

249

188

263

202

264

203

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

265

204

if(ret == -1){

266

perror_plus("close");

205

perror("close");

267

206

}

268

207

gpgme_data_release(pgp_data);

269

208

return true;

394

333

395

334

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

396

335

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

397

perror_plus("gpgme_data_seek");

336

perror("gpgme_data_seek");

398

337

plaintext_length = -1;

399

338

goto decrypt_end;

400

339

}

405

344

(size_t)plaintext_length,

406

345

plaintext_capacity);

407

346

if(plaintext_capacity == 0){

408

perror_plus("incbuffer");

347

perror("incbuffer");

409

348

plaintext_length = -1;

410

349

goto decrypt_end;

411

350

}

418

357

break;

419

358

}

420

359

if(ret < 0){

421

perror_plus("gpgme_data_read");

360

perror("gpgme_data_read");

422

361

plaintext_length = -1;

423

362

goto decrypt_end;

424

363

}

481

420

}

482

421

483

422

/* OpenPGP credentials */

484

ret = gnutls_certificate_allocate_credentials(&mc.cred);

423

gnutls_certificate_allocate_credentials(&mc.cred);

485

424

if(ret != GNUTLS_E_SUCCESS){

486

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

425

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

426

from

427

-Wunreachable-code

428

*/

487

429

safer_gnutls_strerror(ret));

488

430

gnutls_global_deinit();

489

431

return -1;

611

553

gnutls_session_t session;

612

554

int pf; /* Protocol family */

613

555

614

errno = 0;

615

616

556

if(quit_now){

617

errno = EINTR;

618

557

return -1;

619

558

}

620

559

627

566

break;

628

567

default:

629

568

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

630

errno = EINVAL;

631

569

return -1;

632

570

}

633

571

643

581

644

582

tcp_sd = socket(pf, SOCK_STREAM, 0);

645

583

if(tcp_sd < 0){

646

int e = errno;

647

perror_plus("socket");

648

errno = e;

584

perror("socket");

649

585

goto mandos_end;

650

586

}

651

587

652

588

if(quit_now){

653

errno = EINTR;

654

589

goto mandos_end;

655

590

}

656

591

663

598

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

664

599

}

665

600

if(ret < 0 ){

666

int e = errno;

667

perror_plus("inet_pton");

668

errno = e;

601

perror("inet_pton");

669

602

goto mandos_end;

670

603

}

671

604

if(ret == 0){

672

int e = errno;

673

605

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

674

errno = e;

675

606

goto mandos_end;

676

607

}

677

608

if(af == AF_INET6){

685

616

if(if_index == AVAHI_IF_UNSPEC){

686

617

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

687

618

" without a network interface\n");

688

errno = EINVAL;

689

619

goto mandos_end;

690

620

}

691

621

/* Set the network interface number as scope */

698

628

}

699

629

700

630

if(quit_now){

701

errno = EINTR;

702

631

goto mandos_end;

703

632

}

704

633

706

635

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

707

636

char interface[IF_NAMESIZE];

708

637

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

709

perror_plus("if_indextoname");

638

perror("if_indextoname");

710

639

} else {

711

640

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

712

641

ip, interface, port);

726

655

sizeof(addrstr));

727

656

}

728

657

if(pcret == NULL){

729

perror_plus("inet_ntop");

658

perror("inet_ntop");

730

659

} else {

731

660

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

732

661

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

735

664

}

736

665

737

666

if(quit_now){

738

errno = EINTR;

739

667

goto mandos_end;

740

668

}

741

669

745

673

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

746

674

}

747

675

if(ret < 0){

748

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

749

int e = errno;

750

perror_plus("connect");

751

errno = e;

752

}

676

perror("connect");

753

677

goto mandos_end;

754

678

}

755

679

756

680

if(quit_now){

757

errno = EINTR;

758

681

goto mandos_end;

759

682

}

760

683

765

688

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

766

689

out_size - written));

767

690

if(ret == -1){

768

int e = errno;

769

perror_plus("write");

770

errno = e;

691

perror("write");

771

692

goto mandos_end;

772

693

}

773

694

written += (size_t)ret;

783

704

}

784

705

785

706

if(quit_now){

786

errno = EINTR;

787

707

goto mandos_end;

788

708

}

789

709

}

793

713

}

794

714

795

715

if(quit_now){

796

errno = EINTR;

797

716

goto mandos_end;

798

717

}

799

718

800

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

801

719

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

802

720

803

721

if(quit_now){

804

errno = EINTR;

805

722

goto mandos_end;

806

723

}

807

724

808

725

do {

809

726

ret = gnutls_handshake(session);

810

727

if(quit_now){

811

errno = EINTR;

812

728

goto mandos_end;

813

729

}

814

730

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

818

734

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

819

735

gnutls_perror(ret);

820

736

}

821

errno = EPROTO;

822

737

goto mandos_end;

823

738

}

824

739

832

747

while(true){

833

748

834

749

if(quit_now){

835

errno = EINTR;

836

750

goto mandos_end;

837

751

}

838

752

839

753

buffer_capacity = incbuffer(&buffer, buffer_length,

840

754

buffer_capacity);

841

755

if(buffer_capacity == 0){

842

int e = errno;

843

perror_plus("incbuffer");

844

errno = e;

756

perror("incbuffer");

845

757

goto mandos_end;

846

758

}

847

759

848

760

if(quit_now){

849

errno = EINTR;

850

761

goto mandos_end;

851

762

}

852

763

865

776

ret = gnutls_handshake(session);

866

777

867

778

if(quit_now){

868

errno = EINTR;

869

779

goto mandos_end;

870

780

}

871

781

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

872

782

if(ret < 0){

873

783

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

874

784

gnutls_perror(ret);

875

errno = EPROTO;

876

785

goto mandos_end;

877

786

}

878

787

break;

880

789

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

881

790

" encrypted session with Mandos server\n");

882

791

gnutls_bye(session, GNUTLS_SHUT_RDWR);

883

errno = EIO;

884

792

goto mandos_end;

885

793

}

886

794

} else {

893

801

}

894

802

895

803

if(quit_now){

896

errno = EINTR;

897

804

goto mandos_end;

898

805

}

899

806

900

807

do {

901

808

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

902

809

if(quit_now){

903

errno = EINTR;

904

810

goto mandos_end;

905

811

}

906

812

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

915

821

written = 0;

916

822

while(written < (size_t) decrypted_buffer_size){

917

823

if(quit_now){

918

errno = EINTR;

919

824

goto mandos_end;

920

825

}

921

826

923

828

(size_t)decrypted_buffer_size - written,

924

829

stdout);

925

830

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

926

int e = errno;

927

831

if(debug){

928

832

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

929

833

strerror(errno));

930

834

}

931

errno = e;

932

835

goto mandos_end;

933

836

}

934

837

written += (size_t)ret;

940

843

/* Shutdown procedure */

941

844

942

845

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

}

846

free(decrypted_buffer);

847

free(buffer);

848

if(tcp_sd >= 0){

849

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

850

}

851

if(ret == -1){

852

perror("close");

853

}

854

gnutls_deinit(session);

855

if(quit_now){

856

retval = -1;

962

857

}

963

858

return retval;

964

859

}

1007

902

avahi_proto_to_af(proto));

1008

903

if(ret == 0){

1009

904

avahi_simple_poll_quit(mc.simple_poll);

1010

} else {

1011

ret = add_server(ip, port, interface,

1012

avahi_proto_to_af(proto));

1013

905

}

1014

906

}

1015

907

}

1069

961

}

1070

962

}

1071

963

1072

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

964

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

1073

965

static void handle_sigterm(int sig){

1074

966

if(quit_now){

1075

967

return;

1077

969

quit_now = 1;

1078

970

signal_received = sig;

1079

971

int old_errno = errno;

1080

/* set main loop to exit */

1081

972

if(mc.simple_poll != NULL){

1082

973

avahi_simple_poll_quit(mc.simple_poll);

1083

974

}

1084

975

errno = old_errno;

1085

976

}

1086

977

1087

/*

1088

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

1089

* corresponds to an acceptable network device.

1090

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

1091

*/

1092

int good_interface(const struct dirent *if_entry){

1093

ssize_t ssret;

1094

char *flagname = NULL;

1095

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

1096

return 0;

1097

}

1098

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

1099

if_entry->d_name);

1100

if(ret < 0){

1101

perror_plus("asprintf");

1102

return 0;

1103

}

1104

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

1105

if(flags_fd == -1){

1106

perror_plus("open");

1107

free(flagname);

1108

return 0;

1109

}

1110

free(flagname);

1111

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

1112

/* 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';

1116

if(flagstring == NULL){

1117

perror_plus("malloc");

1118

close(flags_fd);

1119

return 0;

1120

}

1121

while(to_read > 0){

1122

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

1123

(size_t)to_read));

1124

if(ssret == -1){

1125

perror_plus("read");

1126

free(flagstring);

1127

close(flags_fd);

1128

return 0;

1129

}

1130

to_read -= ssret;

1131

if(ssret == 0){

1132

break;

1133

}

1134

}

1135

close(flags_fd);

1136

intmax_t tmpmax;

1137

char *tmp;

1138

errno = 0;

1139

tmpmax = strtoimax(flagstring, &tmp, 0);

1140

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

1141

and not (isspace(*tmp)))

1142

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

free(flagstring);

1148

return 0;

1149

}

1150

free(flagstring);

1151

ifreq_flags flags = (ifreq_flags)tmpmax;

1152

/* Reject the loopback device */

1153

if(flags & IFF_LOOPBACK){

1154

if(debug){

1155

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

1156

if_entry->d_name);

1157

}

1158

return 0;

1159

}

1160

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

1161

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

return 1;

1167

}

1168

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

1169

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

return 0;

1183

}

1184

/* 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

}

1272

}

1273

1274

978

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

1275

979

AvahiSServiceBrowser *sb = NULL;

1276

980

int error;

1278

982

intmax_t tmpmax;

1279

983

char *tmp;

1280

984

int exitcode = EXIT_SUCCESS;

1281

const char *interface = "";

985

const char *interface = "eth0";

1282

986

struct ifreq network;

1283

987

int sd = -1;

1284

988

bool take_down_interface = false;

1285

989

uid_t uid;

1286

990

gid_t gid;

991

char *connect_to = NULL;

1287

992

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

1288

993

bool tempdir_created = false;

1289

994

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1293

998

bool gnutls_initialized = false;

1294

999

bool gpgme_initialized = false;

1295

1000

float delay = 2.5f;

1296

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

1297

retrying the same server again */

1298

1001

1299

1002

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1300

1003

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1306

1009

errno = 0;

1307

1010

ret = setgid(gid);

1308

1011

if(ret == -1){

1309

perror_plus("setgid");

1012

perror("setgid");

1310

1013

}

1311

1014

1312

1015

/* Lower user privileges (temporarily) */

1313

1016

errno = 0;

1314

1017

ret = seteuid(uid);

1315

1018

if(ret == -1){

1316

perror_plus("seteuid");

1019

perror("seteuid");

1317

1020

}

1318

1021

1319

1022

if(quit_now){

1354

1057

.arg = "SECONDS",

1355

1058

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

1356

1059

.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

1060

/*

1362

1061

* These reproduce what we would get without ARGP_NO_HELP

1363

1062

*/

1407

1106

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

1408

1107

argp_error(state, "Bad delay");

1409

1108

}

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");

1416

}

1417

1109

break;

1418

1110

/*

1419

1111

* These reproduce what we would get without ARGP_NO_HELP

1447

1139

case ENOMEM:

1448

1140

default:

1449

1141

errno = ret;

1450

perror_plus("argp_parse");

1142

perror("argp_parse");

1451

1143

exitcode = EX_OSERR;

1452

1144

goto end;

1453

1145

case EINVAL:

1455

1147

goto end;

1456

1148

}

1457

1149

}

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");

1512

}

1513

}

1514

1150

1515

1151

if(not debug){

1516

1152

avahi_set_log_function(empty_log);

1517

1153

}

1518

1519

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

1520

struct dirent **direntries;

1521

ret = scandir(sys_class_net, &direntries, good_interface,

1522

alphasort);

1523

if(ret >= 1){

1524

/* Pick the first good interface */

1525

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

1526

if(debug){

1527

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

1528

}

1529

if(interface == NULL){

1530

perror_plus("malloc");

1531

free(direntries);

1532

exitcode = EXIT_FAILURE;

1533

goto end;

1534

}

1535

free(direntries);

1536

} else {

1537

free(direntries);

1538

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

1539

exitcode = EXIT_FAILURE;

1540

goto end;

1541

}

1542

}

1543

1154

1544

1155

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

1545

1156

from the signal handler */

1548

1159

mc.simple_poll = avahi_simple_poll_new();

1549

1160

if(mc.simple_poll == NULL){

1550

1161

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

1551

exitcode = EX_UNAVAILABLE;

1162

exitcode = EXIT_FAILURE;

1552

1163

goto end;

1553

1164

}

1554

1165

1555

1166

sigemptyset(&sigterm_action.sa_mask);

1556

1167

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

1557

1168

if(ret == -1){

1558

perror_plus("sigaddset");

1559

exitcode = EX_OSERR;

1169

perror("sigaddset");

1170

exitcode = EXIT_FAILURE;

1560

1171

goto end;

1561

1172

}

1562

1173

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

1563

1174

if(ret == -1){

1564

perror_plus("sigaddset");

1565

exitcode = EX_OSERR;

1175

perror("sigaddset");

1176

exitcode = EXIT_FAILURE;

1566

1177

goto end;

1567

1178

}

1568

1179

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

1569

1180

if(ret == -1){

1570

perror_plus("sigaddset");

1571

exitcode = EX_OSERR;

1181

perror("sigaddset");

1182

exitcode = EXIT_FAILURE;

1572

1183

goto end;

1573

1184

}

1574

1185

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

1577

1188

*/

1578

1189

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

1579

1190

if(ret == -1){

1580

perror_plus("sigaction");

1581

return EX_OSERR;

1191

perror("sigaction");

1192

return EXIT_FAILURE;

1582

1193

}

1583

1194

if(old_sigterm_action.sa_handler != SIG_IGN){

1584

1195

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

1585

1196

if(ret == -1){

1586

perror_plus("sigaction");

1587

exitcode = EX_OSERR;

1197

perror("sigaction");

1198

exitcode = EXIT_FAILURE;

1588

1199

goto end;

1589

1200

}

1590

1201

}

1591

1202

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

1592

1203

if(ret == -1){

1593

perror_plus("sigaction");

1594

return EX_OSERR;

1204

perror("sigaction");

1205

return EXIT_FAILURE;

1595

1206

}

1596

1207

if(old_sigterm_action.sa_handler != SIG_IGN){

1597

1208

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

1598

1209

if(ret == -1){

1599

perror_plus("sigaction");

1600

exitcode = EX_OSERR;

1210

perror("sigaction");

1211

exitcode = EXIT_FAILURE;

1601

1212

goto end;

1602

1213

}

1603

1214

}

1604

1215

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

1605

1216

if(ret == -1){

1606

perror_plus("sigaction");

1607

return EX_OSERR;

1217

perror("sigaction");

1218

return EXIT_FAILURE;

1608

1219

}

1609

1220

if(old_sigterm_action.sa_handler != SIG_IGN){

1610

1221

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

1611

1222

if(ret == -1){

1612

perror_plus("sigaction");

1613

exitcode = EX_OSERR;

1223

perror("sigaction");

1224

exitcode = EXIT_FAILURE;

1614

1225

goto end;

1615

1226

}

1616

1227

}

1617

1228

1618

1229

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

1619

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

1230

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

1620

1231

if_index = (AvahiIfIndex) if_nametoindex(interface);

1621

1232

if(if_index == 0){

1622

1233

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

1623

exitcode = EX_UNAVAILABLE;

1234

exitcode = EXIT_FAILURE;

1624

1235

goto end;

1625

1236

}

1626

1237

1632

1243

errno = 0;

1633

1244

ret = seteuid(0);

1634

1245

if(ret == -1){

1635

perror_plus("seteuid");

1246

perror("seteuid");

1636

1247

}

1637

1248

1638

1249

#ifdef __linux__

1642

1253

bool restore_loglevel = true;

1643

1254

if(ret == -1){

1644

1255

restore_loglevel = false;

1645

perror_plus("klogctl");

1256

perror("klogctl");

1646

1257

}

1647

1258

#endif /* __linux__ */

1648

1259

1649

1260

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1650

1261

if(sd < 0){

1651

perror_plus("socket");

1652

exitcode = EX_OSERR;

1262

perror("socket");

1263

exitcode = EXIT_FAILURE;

1653

1264

#ifdef __linux__

1654

1265

if(restore_loglevel){

1655

1266

ret = klogctl(7, NULL, 0);

1656

1267

if(ret == -1){

1657

perror_plus("klogctl");

1268

perror("klogctl");

1658

1269

}

1659

1270

}

1660

1271

#endif /* __linux__ */

1662

1273

errno = 0;

1663

1274

ret = seteuid(uid);

1664

1275

if(ret == -1){

1665

perror_plus("seteuid");

1276

perror("seteuid");

1666

1277

}

1667

1278

goto end;

1668

1279

}

1669

1280

strcpy(network.ifr_name, interface);

1670

1281

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

1671

1282

if(ret == -1){

1672

perror_plus("ioctl SIOCGIFFLAGS");

1283

perror("ioctl SIOCGIFFLAGS");

1673

1284

#ifdef __linux__

1674

1285

if(restore_loglevel){

1675

1286

ret = klogctl(7, NULL, 0);

1676

1287

if(ret == -1){

1677

perror_plus("klogctl");

1288

perror("klogctl");

1678

1289

}

1679

1290

}

1680

1291

#endif /* __linux__ */

1681

exitcode = EX_OSERR;

1292

exitcode = EXIT_FAILURE;

1682

1293

/* Lower privileges */

1683

1294

errno = 0;

1684

1295

ret = seteuid(uid);

1685

1296

if(ret == -1){

1686

perror_plus("seteuid");

1297

perror("seteuid");

1687

1298

}

1688

1299

goto end;

1689

1300

}

1693

1304

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

1694

1305

if(ret == -1){

1695

1306

take_down_interface = false;

1696

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1697

exitcode = EX_OSERR;

1307

perror("ioctl SIOCSIFFLAGS");

1308

exitcode = EXIT_FAILURE;

1698

1309

#ifdef __linux__

1699

1310

if(restore_loglevel){

1700

1311

ret = klogctl(7, NULL, 0);

1701

1312

if(ret == -1){

1702

perror_plus("klogctl");

1313

perror("klogctl");

1703

1314

}

1704

1315

}

1705

1316

#endif /* __linux__ */

1707

1318

errno = 0;

1708

1319

ret = seteuid(uid);

1709

1320

if(ret == -1){

1710

perror_plus("seteuid");

1321

perror("seteuid");

1711

1322

}

1712

1323

goto end;

1713

1324

}

1714

1325

}

1715

/* Sleep checking until interface is running.

1716

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

1326

/* sleep checking until interface is running */

1717

1327

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

1718

1328

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

1719

1329

if(ret == -1){

1720

perror_plus("ioctl SIOCGIFFLAGS");

1330

perror("ioctl SIOCGIFFLAGS");

1721

1331

} else if(network.ifr_flags & IFF_RUNNING){

1722

1332

break;

1723

1333

}

1724

1334

struct timespec sleeptime = { .tv_nsec = 250000000 };

1725

1335

ret = nanosleep(&sleeptime, NULL);

1726

1336

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

1727

perror_plus("nanosleep");

1337

perror("nanosleep");

1728

1338

}

1729

1339

}

1730

1340

if(not take_down_interface){

1731

1341

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

1732

1342

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

1733

1343

if(ret == -1){

1734

perror_plus("close");

1344

perror("close");

1735

1345

}

1736

1346

}

1737

1347

#ifdef __linux__

1739

1349

/* Restores kernel loglevel to default */

1740

1350

ret = klogctl(7, NULL, 0);

1741

1351

if(ret == -1){

1742

perror_plus("klogctl");

1352

perror("klogctl");

1743

1353

}

1744

1354

}

1745

1355

#endif /* __linux__ */

1749

1359

/* Lower privileges */

1750

1360

ret = seteuid(uid);

1751

1361

if(ret == -1){

1752

perror_plus("seteuid");

1362

perror("seteuid");

1753

1363

}

1754

1364

} else {

1755

1365

/* Lower privileges permanently */

1756

1366

ret = setuid(uid);

1757

1367

if(ret == -1){

1758

perror_plus("setuid");

1368

perror("setuid");

1759

1369

}

1760

1370

}

1761

1371

}

1767

1377

ret = init_gnutls_global(pubkey, seckey);

1768

1378

if(ret == -1){

1769

1379

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

1770

exitcode = EX_UNAVAILABLE;

1380

exitcode = EXIT_FAILURE;

1771

1381

goto end;

1772

1382

} else {

1773

1383

gnutls_initialized = true;

1777

1387

goto end;

1778

1388

}

1779

1389

1390

tempdir_created = true;

1780

1391

if(mkdtemp(tempdir) == NULL){

1781

perror_plus("mkdtemp");

1392

tempdir_created = false;

1393

perror("mkdtemp");

1782

1394

goto end;

1783

1395

}

1784

tempdir_created = true;

1785

1396

1786

1397

if(quit_now){

1787

1398

goto end;

1789

1400

1790

1401

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

1791

1402

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

1792

exitcode = EX_UNAVAILABLE;

1403

exitcode = EXIT_FAILURE;

1793

1404

goto end;

1794

1405

} else {

1795

1406

gpgme_initialized = true;

1805

1416

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

1806

1417

if(address == NULL){

1807

1418

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

1808

exitcode = EX_USAGE;

1419

exitcode = EXIT_FAILURE;

1809

1420

goto end;

1810

1421

}

1811

1422

1819

1430

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

1820

1431

or tmpmax != (uint16_t)tmpmax){

1821

1432

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

1822

exitcode = EX_USAGE;

1433

exitcode = EXIT_FAILURE;

1823

1434

goto end;

1824

1435

}

1825

1436

1841

1452

if(quit_now){

1842

1453

goto end;

1843

1454

}

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){

1455

1456

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

1457

if(ret < 0){

1458

exitcode = EXIT_FAILURE;

1459

} else {

1854

1460

exitcode = EXIT_SUCCESS;

1855

1461

}

1856

1857

1462

goto end;

1858

1463

}

1859

1464

1883

1488

if(mc.server == NULL){

1884

1489

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

1885

1490

avahi_strerror(error));

1886

exitcode = EX_UNAVAILABLE;

1491

exitcode = EXIT_FAILURE;

1887

1492

goto end;

1888

1493

}

1889

1494

1898

1503

if(sb == NULL){

1899

1504

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

1900

1505

avahi_strerror(avahi_server_errno(mc.server)));

1901

exitcode = EX_UNAVAILABLE;

1506

exitcode = EXIT_FAILURE;

1902

1507

goto end;

1903

1508

}

1904

1509

1911

1516

if(debug){

1912

1517

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

1913

1518

}

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

}

1519

1520

avahi_simple_poll_loop(mc.simple_poll);

1921

1521

1922

1522

end:

1923

1523

1944

1544

if(gpgme_initialized){

1945

1545

gpgme_release(mc.ctx);

1946

1546

}

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

1547

1959

1548

/* Take down the network interface */

1960

1549

if(take_down_interface){

1962

1551

errno = 0;

1963

1552

ret = seteuid(0);

1964

1553

if(ret == -1){

1965

perror_plus("seteuid");

1554

perror("seteuid");

1966

1555

}

1967

1556

if(geteuid() == 0){

1968

1557

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

1969

1558

if(ret == -1){

1970

perror_plus("ioctl SIOCGIFFLAGS");

1559

perror("ioctl SIOCGIFFLAGS");

1971

1560

} else if(network.ifr_flags & IFF_UP) {

1972

1561

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

1973

1562

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

1974

1563

if(ret == -1){

1975

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1564

perror("ioctl SIOCSIFFLAGS");

1976

1565

}

1977

1566

}

1978

1567

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

1979

1568

if(ret == -1){

1980

perror_plus("close");

1569

perror("close");

1981

1570

}

1982

1571

/* Lower privileges permanently */

1983

1572

errno = 0;

1984

1573

ret = setuid(uid);

1985

1574

if(ret == -1){

1986

perror_plus("setuid");

1575

perror("setuid");

1987

1576

}

1988

1577

}

1989

1578

}

1990

1579

1991

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

1580

/* Removes the temp directory used by GPGME */

1992

1581

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];

1582

DIR *d;

1583

struct dirent *direntry;

1584

d = opendir(tempdir);

1585

if(d == NULL){

1586

if(errno != ENOENT){

1587

perror("opendir");

1588

}

1589

} else {

1590

while(true){

1591

direntry = readdir(d);

1592

if(direntry == NULL){

1593

break;

1594

}

1595

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

1596

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

1597

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

1598

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

1599

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

1600

continue;

1601

}

1999

1602

char *fullname = NULL;

2000

1603

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

2001

1604

direntry->d_name);

2002

1605

if(ret < 0){

2003

perror_plus("asprintf");

1606

perror("asprintf");

2004

1607

continue;

2005

1608

}

2006

1609

ret = remove(fullname);

2010

1613

}

2011

1614

free(fullname);

2012

1615

}

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");

1616

closedir(d);

2020

1617

}

2021

1618

ret = rmdir(tempdir);

2022

1619

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

2023

perror_plus("rmdir");

1620

perror("rmdir");

2024

1621

}

2025

1622

}

2026

1623

2031

1628

&old_sigterm_action,

2032

1629

NULL));

2033

1630

if(ret == -1){

2034

perror_plus("sigaction");

1631

perror("sigaction");

2035

1632

}

2036

1633

do {

2037

1634

ret = raise(signal_received);

2038

1635

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

2039

1636

if(ret != 0){

2040

perror_plus("raise");

1637

perror("raise");

2041

1638

abort();

2042

1639

}

2043

1640

TEMP_FAILURE_RETRY(pause());