/mandos/release : revision 269.2.1

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, program_invocation_short_name */

66

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

65

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

66

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

67

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

68

SIOCSIFFLAGS, if_indextoname(),

69

if_nametoindex(), IF_NAMESIZE */

82

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

83

sigaction(), SIGTERM, sig_atomic_t,

84

raise() */

85

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

86

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

87

85

88

86

#ifdef __linux__

89

87

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

127

125

static const char mandos_protocol_version[] = "1";

128

126

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

129

127

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

130

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

131

char *connect_to = NULL;

132

133

/* Doubly linked list that need to be circular linked when ever used */

134

typedef struct server{

135

const char *ip;

136

uint16_t port;

137

AvahiIfIndex if_index;

138

int af;

139

struct timespec last_seen;

140

struct server *next;

141

struct server *prev;

142

} server;

143

128

144

129

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

145

130

typedef struct {

150

135

gnutls_dh_params_t dh_params;

151

136

const char *priority;

152

137

gpgme_ctx_t ctx;

153

server *current_server;

154

138

} mandos_context;

155

139

156

140

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

157

141

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

158

142

.dh_bits = 1024, .priority = "SECURE256"

159

":!CTYPE-X.509:+CTYPE-OPENPGP", .current_server = NULL };

143

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

160

144

161

145

sig_atomic_t quit_now = 0;

162

146

int signal_received = 0;

163

147

164

/* Function to use when printing errors */

165

void perror_plus(const char *print_text){

166

fprintf(stderr, "Mandos plugin %s: ", program_invocation_short_name);

167

perror(print_text);

168

}

169

170

148

/*

171

149

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

172

150

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

184

162

return buffer_capacity;

185

163

}

186

164

187

int add_server(const char *ip, uint16_t port,

188

AvahiIfIndex if_index,

189

int af){

190

int ret;

191

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

192

if(new_server == NULL){

193

perror_plus("malloc");

194

return -1;

195

}

196

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

197

.port = port,

198

.if_index = if_index,

199

.af = af };

200

if(new_server->ip == NULL){

201

perror_plus("strdup");

202

return -1;

203

}

204

/* uniqe case of first server */

205

if (mc.current_server == NULL){

206

new_server->next = new_server;

207

new_server->prev = new_server;

208

mc.current_server = new_server;

209

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

210

} else {

211

new_server->next = mc.current_server;

212

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

213

new_server->prev->next = new_server;

214

mc.current_server->prev = new_server;

215

}

216

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

217

if(ret == -1){

218

perror_plus("clock_gettime");

219

return -1;

220

}

221

return 0;

222

}

223

224

165

/*

225

166

* Initialize GPGME.

226

167

*/

240

181

241

182

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

242

183

if(fd == -1){

243

perror_plus("open");

184

perror("open");

244

185

return false;

245

186

}

246

187

260

201

261

202

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

262

203

if(ret == -1){

263

perror_plus("close");

204

perror("close");

264

205

}

265

206

gpgme_data_release(pgp_data);

266

207

return true;

391

332

392

333

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

393

334

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

394

perror_plus("gpgme_data_seek");

335

perror("gpgme_data_seek");

395

336

plaintext_length = -1;

396

337

goto decrypt_end;

397

338

}

402

343

(size_t)plaintext_length,

403

344

plaintext_capacity);

404

345

if(plaintext_capacity == 0){

405

perror_plus("incbuffer");

346

perror("incbuffer");

406

347

plaintext_length = -1;

407

348

goto decrypt_end;

408

349

}

415

356

break;

416

357

}

417

358

if(ret < 0){

418

perror_plus("gpgme_data_read");

359

perror("gpgme_data_read");

419

360

plaintext_length = -1;

420

361

goto decrypt_end;

421

362

}

611

552

gnutls_session_t session;

612

553

int pf; /* Protocol family */

613

554

614

errno = 0;

615

616

555

if(quit_now){

617

errno = EINTR;

618

556

return -1;

619

557

}

620

558

627

565

break;

628

566

default:

629

567

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

630

errno = EINVAL;

631

568

return -1;

632

569

}

633

570

643

580

644

581

tcp_sd = socket(pf, SOCK_STREAM, 0);

645

582

if(tcp_sd < 0){

646

int e = errno;

647

perror_plus("socket");

648

errno = e;

583

perror("socket");

649

584

goto mandos_end;

650

585

}

651

586

652

587

if(quit_now){

653

errno = EINTR;

654

588

goto mandos_end;

655

589

}

656

590

663

597

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

664

598

}

665

599

if(ret < 0 ){

666

int e = errno;

667

perror_plus("inet_pton");

668

errno = e;

600

perror("inet_pton");

669

601

goto mandos_end;

670

602

}

671

603

if(ret == 0){

672

int e = errno;

673

604

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

674

errno = e;

675

605

goto mandos_end;

676

606

}

677

607

if(af == AF_INET6){

685

615

if(if_index == AVAHI_IF_UNSPEC){

686

616

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

687

617

" without a network interface\n");

688

errno = EINVAL;

689

618

goto mandos_end;

690

619

}

691

620

/* Set the network interface number as scope */

698

627

}

699

628

700

629

if(quit_now){

701

errno = EINTR;

702

630

goto mandos_end;

703

631

}

704

632

706

634

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

707

635

char interface[IF_NAMESIZE];

708

636

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

709

perror_plus("if_indextoname");

637

perror("if_indextoname");

710

638

} else {

711

639

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

712

640

ip, interface, port);

726

654

sizeof(addrstr));

727

655

}

728

656

if(pcret == NULL){

729

perror_plus("inet_ntop");

657

perror("inet_ntop");

730

658

} else {

731

659

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

732

660

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

735

663

}

736

664

737

665

if(quit_now){

738

errno = EINTR;

739

666

goto mandos_end;

740

667

}

741

668

745

672

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

746

673

}

747

674

if(ret < 0){

748

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

749

int e = errno;

750

perror_plus("connect");

751

errno = e;

752

}

675

perror("connect");

753

676

goto mandos_end;

754

677

}

755

678

756

679

if(quit_now){

757

errno = EINTR;

758

680

goto mandos_end;

759

681

}

760

682

765

687

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

766

688

out_size - written));

767

689

if(ret == -1){

768

int e = errno;

769

perror_plus("write");

770

errno = e;

690

perror("write");

771

691

goto mandos_end;

772

692

}

773

693

written += (size_t)ret;

783

703

}

784

704

785

705

if(quit_now){

786

errno = EINTR;

787

706

goto mandos_end;

788

707

}

789

708

}

793

712

}

794

713

795

714

if(quit_now){

796

errno = EINTR;

797

715

goto mandos_end;

798

716

}

799

800

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

717

801

718

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

802

719

803

720

if(quit_now){

804

errno = EINTR;

805

721

goto mandos_end;

806

722

}

807

723

808

724

do {

809

725

ret = gnutls_handshake(session);

810

726

if(quit_now){

811

errno = EINTR;

812

727

goto mandos_end;

813

728

}

814

729

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

818

733

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

819

734

gnutls_perror(ret);

820

735

}

821

errno = EPROTO;

822

736

goto mandos_end;

823

737

}

824

738

832

746

while(true){

833

747

834

748

if(quit_now){

835

errno = EINTR;

836

749

goto mandos_end;

837

750

}

838

751

839

752

buffer_capacity = incbuffer(&buffer, buffer_length,

840

753

buffer_capacity);

841

754

if(buffer_capacity == 0){

842

int e = errno;

843

perror_plus("incbuffer");

844

errno = e;

755

perror("incbuffer");

845

756

goto mandos_end;

846

757

}

847

758

848

759

if(quit_now){

849

errno = EINTR;

850

760

goto mandos_end;

851

761

}

852

762

865

775

ret = gnutls_handshake(session);

866

776

867

777

if(quit_now){

868

errno = EINTR;

869

778

goto mandos_end;

870

779

}

871

780

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

872

781

if(ret < 0){

873

782

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

874

783

gnutls_perror(ret);

875

errno = EPROTO;

876

784

goto mandos_end;

877

785

}

878

786

break;

880

788

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

881

789

" encrypted session with Mandos server\n");

882

790

gnutls_bye(session, GNUTLS_SHUT_RDWR);

883

errno = EIO;

884

791

goto mandos_end;

885

792

}

886

793

} else {

893

800

}

894

801

895

802

if(quit_now){

896

errno = EINTR;

897

803

goto mandos_end;

898

804

}

899

805

900

806

do {

901

807

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

902

808

if(quit_now){

903

errno = EINTR;

904

809

goto mandos_end;

905

810

}

906

811

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

915

820

written = 0;

916

821

while(written < (size_t) decrypted_buffer_size){

917

822

if(quit_now){

918

errno = EINTR;

919

823

goto mandos_end;

920

824

}

921

825

923

827

(size_t)decrypted_buffer_size - written,

924

828

stdout);

925

829

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

926

int e = errno;

927

830

if(debug){

928

831

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

929

832

strerror(errno));

930

833

}

931

errno = e;

932

834

goto mandos_end;

933

835

}

934

836

written += (size_t)ret;

940

842

/* Shutdown procedure */

941

843

942

844

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

}

845

free(decrypted_buffer);

846

free(buffer);

847

if(tcp_sd >= 0){

848

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

849

}

850

if(ret == -1){

851

perror("close");

852

}

853

gnutls_deinit(session);

854

if(quit_now){

855

retval = -1;

962

856

}

963

857

return retval;

964

858

}

1007

901

avahi_proto_to_af(proto));

1008

902

if(ret == 0){

1009

903

avahi_simple_poll_quit(mc.simple_poll);

1010

} else {

1011

ret = add_server(ip, port, interface,

1012

avahi_proto_to_af(proto));

1013

904

}

1014

905

}

1015

906

}

1069

960

}

1070

961

}

1071

962

1072

/* Signal handler that stops main loop after sigterm has been called */

963

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

1073

964

static void handle_sigterm(int sig){

1074

965

if(quit_now){

1075

966

return;

1077

968

quit_now = 1;

1078

969

signal_received = sig;

1079

970

int old_errno = errno;

1080

/* set main loop to exit */

1081

971

if(mc.simple_poll != NULL){

1082

972

avahi_simple_poll_quit(mc.simple_poll);

1083

973

}

1084

974

errno = old_errno;

1085

975

}

1086

976

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 = (sizeof(ifreq_flags)*2)+3; /* "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, "Wait until first server is found. No timeout!\n");

1213

}

1214

ret = avahi_simple_poll_iterate(s, -1);

1215

} else {

1216

if (debug){

1217

fprintf(stderr, "Check current_server if we should run it, or wait\n");

1218

}

1219

/* the current time */

1220

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1221

if(ret == -1){

1222

perror_plus("clock_gettime");

1223

return -1;

1224

}

1225

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

1226

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

1227

waited_time.tv_sec = now.tv_sec - mc.current_server->last_seen.tv_sec;

1228

waited_time.tv_nsec = now.tv_nsec - mc.current_server->last_seen.tv_nsec;

1229

/* total time is 10s/10000ms. Converting to s to ms by 1000/s, and ns to ms by divind by 1000000. */

1230

block_time = (retry_interval - ((intmax_t)waited_time.tv_sec * 1000)) - ((intmax_t)waited_time.tv_nsec / 1000000);

1231

1232

if (debug){

1233

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

1234

}

1235

1236

if(block_time <= 0){

1237

ret = start_mandos_communication(mc.current_server->ip,

1238

mc.current_server->port,

1239

mc.current_server->if_index,

1240

mc.current_server->af);

1241

if(ret == 0){

1242

avahi_simple_poll_quit(mc.simple_poll);

1243

return 0;

1244

}

1245

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

1246

if(ret == -1){

1247

perror_plus("clock_gettime");

1248

return -1;

1249

}

1250

mc.current_server = mc.current_server->next;

1251

block_time = 0; /* call avahi to find new mandos servers, but dont block */

1252

}

1253

1254

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

1255

}

1256

if(ret != 0){

1257

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

1258

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

1259

}

1260

}

1261

}

1262

}

1263

1264

977

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

1265

978

AvahiSServiceBrowser *sb = NULL;

1266

979

int error;

1268

981

intmax_t tmpmax;

1269

982

char *tmp;

1270

983

int exitcode = EXIT_SUCCESS;

1271

const char *interface = "";

984

const char *interface = "eth0";

1272

985

struct ifreq network;

1273

986

int sd = -1;

1274

987

bool take_down_interface = false;

1275

988

uid_t uid;

1276

989

gid_t gid;

990

char *connect_to = NULL;

1277

991

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

1278

992

bool tempdir_created = false;

1279

993

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1283

997

bool gnutls_initialized = false;

1284

998

bool gpgme_initialized = false;

1285

999

float delay = 2.5f;

1286

double retry_interval = 10; /* 10s between retrying a server and checking again*/

1287

1000

1288

1001

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1289

1002

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1295

1008

errno = 0;

1296

1009

ret = setgid(gid);

1297

1010

if(ret == -1){

1298

perror_plus("setgid");

1011

perror("setgid");

1299

1012

}

1300

1013

1301

1014

/* Lower user privileges (temporarily) */

1302

1015

errno = 0;

1303

1016

ret = seteuid(uid);

1304

1017

if(ret == -1){

1305

perror_plus("seteuid");

1018

perror("seteuid");

1306

1019

}

1307

1020

1308

1021

if(quit_now){

1343

1056

.arg = "SECONDS",

1344

1057

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

1345

1058

.group = 2 },

1346

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

1347

.arg = "SECONDS",

1348

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

1349

.group = 2 },

1350

/*

1351

* These reproduce what we would get without ARGP_NO_HELP

1352

*/

1353

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

1354

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

1355

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

1356

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

1357

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

1358

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

1359

1059

{ .name = NULL }

1360

1060

};

1361

1061

1362

1062

error_t parse_opt(int key, char *arg,

1363

1063

struct argp_state *state){

1364

errno = 0;

1365

1064

switch(key){

1366

1065

case 128: /* --debug */

1367

1066

debug = true;

1383

1082

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

1384

1083

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

1385

1084

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

1386

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

1085

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

1086

exit(EXIT_FAILURE);

1387

1087

}

1388

1088

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

1389

1089

break;

1394

1094

errno = 0;

1395

1095

delay = strtof(arg, &tmp);

1396

1096

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

1397

argp_error(state, "Bad delay");

1398

}

1399

case 132: /* --retry */

1400

errno = 0;

1401

retry_interval = strtod(arg, &tmp);

1402

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

1403

or (retry_interval * 1000) > INT_MAX){

1404

argp_error(state, "Bad retry interval");

1097

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

1098

exit(EXIT_FAILURE);

1405

1099

}

1406

1100

break;

1407

/*

1408

* These reproduce what we would get without ARGP_NO_HELP

1409

*/

1410

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

1411

argp_state_help(state, state->out_stream,

1412

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1413

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1414

case -3: /* --usage */

1415

argp_state_help(state, state->out_stream,

1416

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1417

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

1418

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

1419

exit(argp_err_exit_status);

1101

case ARGP_KEY_ARG:

1102

argp_usage(state);

1103

case ARGP_KEY_END:

1420

1104

break;

1421

1105

default:

1422

1106

return ARGP_ERR_UNKNOWN;

1423

1107

}

1424

return errno;

1108

return 0;

1425

1109

}

1426

1110

1427

1111

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

1428

1112

.args_doc = "",

1429

1113

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

1430

1114

" passwords from a Mandos server" };

1431

ret = argp_parse(&argp, argc, argv,

1432

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1433

switch(ret){

1434

case 0:

1435

break;

1436

case ENOMEM:

1437

default:

1438

errno = ret;

1439

perror_plus("argp_parse");

1440

exitcode = EX_OSERR;

1441

goto end;

1442

case EINVAL:

1443

exitcode = EX_USAGE;

1115

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

1116

if(ret == ARGP_ERR_UNKNOWN){

1117

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

1118

exitcode = EXIT_FAILURE;

1444

1119

goto end;

1445

1120

}

1446

1121

}

1448

1123

if(not debug){

1449

1124

avahi_set_log_function(empty_log);

1450

1125

}

1451

1452

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

1453

struct dirent **direntries;

1454

ret = scandir(sys_class_net, &direntries, good_interface,

1455

alphasort);

1456

if(ret >= 1){

1457

/* Pick the first good interface */

1458

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

1459

if(debug){

1460

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

1461

}

1462

if(interface == NULL){

1463

perror_plus("malloc");

1464

free(direntries);

1465

exitcode = EXIT_FAILURE;

1466

goto end;

1467

}

1468

free(direntries);

1469

} else {

1470

free(direntries);

1471

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

1472

exitcode = EXIT_FAILURE;

1473

goto end;

1474

}

1475

}

1476

1126

1477

1127

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

1478

1128

from the signal handler */

1481

1131

mc.simple_poll = avahi_simple_poll_new();

1482

1132

if(mc.simple_poll == NULL){

1483

1133

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

1484

exitcode = EX_UNAVAILABLE;

1134

exitcode = EXIT_FAILURE;

1485

1135

goto end;

1486

1136

}

1487

1137

1488

1138

sigemptyset(&sigterm_action.sa_mask);

1489

1139

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

1490

1140

if(ret == -1){

1491

perror_plus("sigaddset");

1492

exitcode = EX_OSERR;

1141

perror("sigaddset");

1142

exitcode = EXIT_FAILURE;

1493

1143

goto end;

1494

1144

}

1495

1145

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

1496

1146

if(ret == -1){

1497

perror_plus("sigaddset");

1498

exitcode = EX_OSERR;

1147

perror("sigaddset");

1148

exitcode = EXIT_FAILURE;

1499

1149

goto end;

1500

1150

}

1501

1151

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

1502

1152

if(ret == -1){

1503

perror_plus("sigaddset");

1504

exitcode = EX_OSERR;

1153

perror("sigaddset");

1154

exitcode = EXIT_FAILURE;

1505

1155

goto end;

1506

1156

}

1507

1157

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

1510

1160

*/

1511

1161

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

1512

1162

if(ret == -1){

1513

perror_plus("sigaction");

1514

return EX_OSERR;

1163

perror("sigaction");

1164

return EXIT_FAILURE;

1515

1165

}

1516

1166

if(old_sigterm_action.sa_handler != SIG_IGN){

1517

1167

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

1518

1168

if(ret == -1){

1519

perror_plus("sigaction");

1520

exitcode = EX_OSERR;

1169

perror("sigaction");

1170

exitcode = EXIT_FAILURE;

1521

1171

goto end;

1522

1172

}

1523

1173

}

1524

1174

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

1525

1175

if(ret == -1){

1526

perror_plus("sigaction");

1527

return EX_OSERR;

1176

perror("sigaction");

1177

return EXIT_FAILURE;

1528

1178

}

1529

1179

if(old_sigterm_action.sa_handler != SIG_IGN){

1530

1180

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

1531

1181

if(ret == -1){

1532

perror_plus("sigaction");

1533

exitcode = EX_OSERR;

1182

perror("sigaction");

1183

exitcode = EXIT_FAILURE;

1534

1184

goto end;

1535

1185

}

1536

1186

}

1537

1187

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

1538

1188

if(ret == -1){

1539

perror_plus("sigaction");

1540

return EX_OSERR;

1189

perror("sigaction");

1190

return EXIT_FAILURE;

1541

1191

}

1542

1192

if(old_sigterm_action.sa_handler != SIG_IGN){

1543

1193

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

1544

1194

if(ret == -1){

1545

perror_plus("sigaction");

1546

exitcode = EX_OSERR;

1195

perror("sigaction");

1196

exitcode = EXIT_FAILURE;

1547

1197

goto end;

1548

1198

}

1549

1199

}

1550

1200

1551

1201

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

1552

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

1202

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

1553

1203

if_index = (AvahiIfIndex) if_nametoindex(interface);

1554

1204

if(if_index == 0){

1555

1205

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

1556

exitcode = EX_UNAVAILABLE;

1206

exitcode = EXIT_FAILURE;

1557

1207

goto end;

1558

1208

}

1559

1209

1565

1215

errno = 0;

1566

1216

ret = seteuid(0);

1567

1217

if(ret == -1){

1568

perror_plus("seteuid");

1218

perror("seteuid");

1569

1219

}

1570

1220

1571

1221

#ifdef __linux__

1572

1222

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1573

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

1223

messages to mess up the prompt */

1574

1224

ret = klogctl(8, NULL, 5);

1575

1225

bool restore_loglevel = true;

1576

1226

if(ret == -1){

1577

1227

restore_loglevel = false;

1578

perror_plus("klogctl");

1228

perror("klogctl");

1579

1229

}

1580

1230

#endif /* __linux__ */

1581

1231

1582

1232

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1583

1233

if(sd < 0){

1584

perror_plus("socket");

1585

exitcode = EX_OSERR;

1234

perror("socket");

1235

exitcode = EXIT_FAILURE;

1586

1236

#ifdef __linux__

1587

1237

if(restore_loglevel){

1588

1238

ret = klogctl(7, NULL, 0);

1589

1239

if(ret == -1){

1590

perror_plus("klogctl");

1240

perror("klogctl");

1591

1241

}

1592

1242

}

1593

1243

#endif /* __linux__ */

1595

1245

errno = 0;

1596

1246

ret = seteuid(uid);

1597

1247

if(ret == -1){

1598

perror_plus("seteuid");

1248

perror("seteuid");

1599

1249

}

1600

1250

goto end;

1601

1251

}

1602

1252

strcpy(network.ifr_name, interface);

1603

1253

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

1604

1254

if(ret == -1){

1605

perror_plus("ioctl SIOCGIFFLAGS");

1255

perror("ioctl SIOCGIFFLAGS");

1606

1256

#ifdef __linux__

1607

1257

if(restore_loglevel){

1608

1258

ret = klogctl(7, NULL, 0);

1609

1259

if(ret == -1){

1610

perror_plus("klogctl");

1260

perror("klogctl");

1611

1261

}

1612

1262

}

1613

1263

#endif /* __linux__ */

1614

exitcode = EX_OSERR;

1264

exitcode = EXIT_FAILURE;

1615

1265

/* Lower privileges */

1616

1266

errno = 0;

1617

1267

ret = seteuid(uid);

1618

1268

if(ret == -1){

1619

perror_plus("seteuid");

1269

perror("seteuid");

1620

1270

}

1621

1271

goto end;

1622

1272

}

1626

1276

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

1627

1277

if(ret == -1){

1628

1278

take_down_interface = false;

1629

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1630

exitcode = EX_OSERR;

1279

perror("ioctl SIOCSIFFLAGS");

1280

exitcode = EXIT_FAILURE;

1631

1281

#ifdef __linux__

1632

1282

if(restore_loglevel){

1633

1283

ret = klogctl(7, NULL, 0);

1634

1284

if(ret == -1){

1635

perror_plus("klogctl");

1285

perror("klogctl");

1636

1286

}

1637

1287

}

1638

1288

#endif /* __linux__ */

1640

1290

errno = 0;

1641

1291

ret = seteuid(uid);

1642

1292

if(ret == -1){

1643

perror_plus("seteuid");

1293

perror("seteuid");

1644

1294

}

1645

1295

goto end;

1646

1296

}

1647

1297

}

1648

/* sleep checking until interface is running. Check every 0.25s, up to total time of delay */

1298

/* sleep checking until interface is running */

1649

1299

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

1650

1300

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

1651

1301

if(ret == -1){

1652

perror_plus("ioctl SIOCGIFFLAGS");

1302

perror("ioctl SIOCGIFFLAGS");

1653

1303

} else if(network.ifr_flags & IFF_RUNNING){

1654

1304

break;

1655

1305

}

1656

1306

struct timespec sleeptime = { .tv_nsec = 250000000 };

1657

1307

ret = nanosleep(&sleeptime, NULL);

1658

1308

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

1659

perror_plus("nanosleep");

1309

perror("nanosleep");

1660

1310

}

1661

1311

}

1662

1312

if(not take_down_interface){

1663

1313

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

1664

1314

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

1665

1315

if(ret == -1){

1666

perror_plus("close");

1316

perror("close");

1667

1317

}

1668

1318

}

1669

1319

#ifdef __linux__

1671

1321

/* Restores kernel loglevel to default */

1672

1322

ret = klogctl(7, NULL, 0);

1673

1323

if(ret == -1){

1674

perror_plus("klogctl");

1324

perror("klogctl");

1675

1325

}

1676

1326

}

1677

1327

#endif /* __linux__ */

1681

1331

/* Lower privileges */

1682

1332

ret = seteuid(uid);

1683

1333

if(ret == -1){

1684

perror_plus("seteuid");

1334

perror("seteuid");

1685

1335

}

1686

1336

} else {

1687

1337

/* Lower privileges permanently */

1688

1338

ret = setuid(uid);

1689

1339

if(ret == -1){

1690

perror_plus("setuid");

1340

perror("setuid");

1691

1341

}

1692

1342

}

1693

1343

}

1699

1349

ret = init_gnutls_global(pubkey, seckey);

1700

1350

if(ret == -1){

1701

1351

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

1702

exitcode = EX_UNAVAILABLE;

1352

exitcode = EXIT_FAILURE;

1703

1353

goto end;

1704

1354

} else {

1705

1355

gnutls_initialized = true;

1709

1359

goto end;

1710

1360

}

1711

1361

1362

tempdir_created = true;

1712

1363

if(mkdtemp(tempdir) == NULL){

1713

perror_plus("mkdtemp");

1364

tempdir_created = false;

1365

perror("mkdtemp");

1714

1366

goto end;

1715

1367

}

1716

tempdir_created = true;

1717

1368

1718

1369

if(quit_now){

1719

1370

goto end;

1721

1372

1722

1373

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

1723

1374

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

1724

exitcode = EX_UNAVAILABLE;

1375

exitcode = EXIT_FAILURE;

1725

1376

goto end;

1726

1377

} else {

1727

1378

gpgme_initialized = true;

1737

1388

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

1738

1389

if(address == NULL){

1739

1390

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

1740

exitcode = EX_USAGE;

1391

exitcode = EXIT_FAILURE;

1741

1392

goto end;

1742

1393

}

1743

1394

1751

1402

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

1752

1403

or tmpmax != (uint16_t)tmpmax){

1753

1404

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

1754

exitcode = EX_USAGE;

1405

exitcode = EXIT_FAILURE;

1755

1406

goto end;

1756

1407

}

1757

1408

1773

1424

if(quit_now){

1774

1425

goto end;

1775

1426

}

1776

1777

while(not quit_now){

1778

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

1779

if(quit_now or ret == 0){

1780

break;

1781

}

1782

sleep((int)retry_interval or 1);

1783

};

1784

1785

if (not quit_now){

1427

1428

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

1429

if(ret < 0){

1430

exitcode = EXIT_FAILURE;

1431

} else {

1786

1432

exitcode = EXIT_SUCCESS;

1787

1433

}

1788

1789

1434

goto end;

1790

1435

}

1791

1436

1815

1460

if(mc.server == NULL){

1816

1461

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

1817

1462

avahi_strerror(error));

1818

exitcode = EX_UNAVAILABLE;

1463

exitcode = EXIT_FAILURE;

1819

1464

goto end;

1820

1465

}

1821

1466

1830

1475

if(sb == NULL){

1831

1476

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

1832

1477

avahi_strerror(avahi_server_errno(mc.server)));

1833

exitcode = EX_UNAVAILABLE;

1478

exitcode = EXIT_FAILURE;

1834

1479

goto end;

1835

1480

}

1836

1481

1843

1488

if(debug){

1844

1489

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

1845

1490

}

1846

1847

ret = avahi_loop_with_timeout(mc.simple_poll, (int)(retry_interval * 1000));

1848

if(debug){

1849

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

1850

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

1851

}

1491

1492

avahi_simple_poll_loop(mc.simple_poll);

1852

1493

1853

1494

end:

1854

1495

1875

1516

if(gpgme_initialized){

1876

1517

gpgme_release(mc.ctx);

1877

1518

}

1878

1879

/* cleans up the circular linked list of mandos servers the client has seen */

1880

if(mc.current_server != NULL){

1881

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

1882

while(mc.current_server != NULL){

1883

server *next = mc.current_server->next;

1884

free(mc.current_server);

1885

mc.current_server = next;

1886

}

1887

}

1888

1519

1889

1520

/* Take down the network interface */

1890

1521

if(take_down_interface){

1892

1523

errno = 0;

1893

1524

ret = seteuid(0);

1894

1525

if(ret == -1){

1895

perror_plus("seteuid");

1526

perror("seteuid");

1896

1527

}

1897

1528

if(geteuid() == 0){

1898

1529

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

1899

1530

if(ret == -1){

1900

perror_plus("ioctl SIOCGIFFLAGS");

1531

perror("ioctl SIOCGIFFLAGS");

1901

1532

} else if(network.ifr_flags & IFF_UP) {

1902

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

1533

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

1903

1534

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

1904

1535

if(ret == -1){

1905

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1536

perror("ioctl SIOCSIFFLAGS");

1906

1537

}

1907

1538

}

1908

1539

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

1909

1540

if(ret == -1){

1910

perror_plus("close");

1541

perror("close");

1911

1542

}

1912

1543

/* Lower privileges permanently */

1913

1544

errno = 0;

1914

1545

ret = setuid(uid);

1915

1546

if(ret == -1){

1916

perror_plus("setuid");

1547

perror("setuid");

1917

1548

}

1918

1549

}

1919

1550

}

1920

1551

1921

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

1552

/* Removes the temp directory used by GPGME */

1922

1553

if(tempdir_created){

1923

struct dirent **direntries = NULL;

1924

struct dirent *direntry = NULL;

1925

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

1926

if (ret > 0){

1927

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

1928

direntry = direntries[i];

1554

DIR *d;

1555

struct dirent *direntry;

1556

d = opendir(tempdir);

1557

if(d == NULL){

1558

if(errno != ENOENT){

1559

perror("opendir");

1560

}

1561

} else {

1562

while(true){

1563

direntry = readdir(d);

1564

if(direntry == NULL){

1565

break;

1566

}

1567

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

1568

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

1569

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

1570

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

1571

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

1572

continue;

1573

}

1929

1574

char *fullname = NULL;

1930

1575

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

1931

1576

direntry->d_name);

1932

1577

if(ret < 0){

1933

perror_plus("asprintf");

1578

perror("asprintf");

1934

1579

continue;

1935

1580

}

1936

1581

ret = remove(fullname);

1940

1585

}

1941

1586

free(fullname);

1942

1587

}

1943

}

1944

1945

/* need to be cleaned even if ret == 0 because man page dont specify */

1946

free(direntries);

1947

if (ret == -1){

1948

perror_plus("scandir");

1588

closedir(d);

1949

1589

}

1950

1590

ret = rmdir(tempdir);

1951

1591

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

1952

perror_plus("rmdir");

1592

perror("rmdir");

1953

1593

}

1954

1594

}

1955

1595

1960

1600

&old_sigterm_action,

1961

1601

NULL));

1962

1602

if(ret == -1){

1963

perror_plus("sigaction");

1603

perror("sigaction");

1964

1604

}

1965

1605

do {

1966

1606

ret = raise(signal_received);

1967

1607

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

1968

1608

if(ret != 0){

1969

perror_plus("raise");

1609

perror("raise");

1970

1610

abort();

1971

1611

}

1972

1612

TEMP_FAILURE_RETRY(pause());