/mandos/trunk : revision 505.2.4

9

* "browse_callback", and parts of "main".

10

*

11

* Everything else is

12

13

12

13

14

*

15

* This program is free software: you can redistribute it and/or

16

* modify it under the terms of the GNU General Public License as

26

* along with this program. If not, see

27

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

28

*

29

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

29

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

30

*/

31

32

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

43

stdout, ferror(), remove() */

44

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

45

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

46

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

120

123

#define PATHDIR "/conf/conf.d/mandos"

121

124

#define SECKEY "seckey.txt"

122

125

#define PUBKEY "pubkey.txt"

126

#define HOOKDIR "/lib/mandos/network-hooks.d"

123

127

124

128

bool debug = false;

125

129

static const char mandos_protocol_version[] = "1";

126

130

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

127

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

131

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

132

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

133

char *connect_to = NULL;

134

135

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

136

typedef struct server{

137

const char *ip;

138

uint16_t port;

139

AvahiIfIndex if_index;

140

int af;

141

struct timespec last_seen;

142

struct server *next;

143

struct server *prev;

144

} server;

128

145

129

146

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

130

147

typedef struct {

135

152

gnutls_dh_params_t dh_params;

136

153

const char *priority;

137

154

gpgme_ctx_t ctx;

155

server *current_server;

138

156

} mandos_context;

139

157

140

158

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

141

159

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

142

160

.dh_bits = 1024, .priority = "SECURE256"

143

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

161

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

162

.current_server = NULL };

144

163

145

164

sig_atomic_t quit_now = 0;

146

165

int signal_received = 0;

147

166

167

/* Function to use when printing errors */

168

void perror_plus(const char *print_text){

169

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

170

program_invocation_short_name);

171

perror(print_text);

172

}

173

174

int fprintf_plus(FILE *stream, const char *format, ...){

175

va_list ap;

176

va_start (ap, format);

177

178

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

179

return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));

180

}

181

148

182

/*

149

183

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

150

184

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

162

196

return buffer_capacity;

163

197

}

164

198

199

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

200

int add_server(const char *ip, uint16_t port,

201

AvahiIfIndex if_index,

202

int af){

203

int ret;

204

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

205

if(new_server == NULL){

206

perror_plus("malloc");

207

return -1;

208

}

209

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

210

.port = port,

211

.if_index = if_index,

212

.af = af };

213

if(new_server->ip == NULL){

214

perror_plus("strdup");

215

return -1;

216

}

217

/* Special case of first server */

218

if (mc.current_server == NULL){

219

new_server->next = new_server;

220

new_server->prev = new_server;

221

mc.current_server = new_server;

222

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

223

} else {

224

new_server->next = mc.current_server;

225

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

226

new_server->prev->next = new_server;

227

mc.current_server->prev = new_server;

228

}

229

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

230

if(ret == -1){

231

perror_plus("clock_gettime");

232

return -1;

233

}

234

return 0;

235

}

236

165

237

/*

166

238

* Initialize GPGME.

167

239

*/

181

253

182

254

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

183

255

if(fd == -1){

184

perror("open");

256

perror_plus("open");

185

257

return false;

186

258

}

187

259

201

273

202

274

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

203

275

if(ret == -1){

204

perror("close");

276

perror_plus("close");

205

277

}

206

278

gpgme_data_release(pgp_data);

207

279

return true;

220

292

return false;

221

293

}

222

294

223

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

295

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

224

296

rc = gpgme_get_engine_info(&engine_info);

225

297

if(rc != GPG_ERR_NO_ERROR){

226

298

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

332

404

333

405

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

334

406

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

335

perror("gpgme_data_seek");

407

perror_plus("gpgme_data_seek");

336

408

plaintext_length = -1;

337

409

goto decrypt_end;

338

410

}

343

415

(size_t)plaintext_length,

344

416

plaintext_capacity);

345

417

if(plaintext_capacity == 0){

346

perror("incbuffer");

418

perror_plus("incbuffer");

347

419

plaintext_length = -1;

348

420

goto decrypt_end;

349

421

}

356

428

break;

357

429

}

358

430

if(ret < 0){

359

perror("gpgme_data_read");

431

perror_plus("gpgme_data_read");

360

432

plaintext_length = -1;

361

433

goto decrypt_end;

362

434

}

419

491

}

420

492

421

493

/* OpenPGP credentials */

422

gnutls_certificate_allocate_credentials(&mc.cred);

494

ret = gnutls_certificate_allocate_credentials(&mc.cred);

423

495

if(ret != GNUTLS_E_SUCCESS){

424

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

425

from

426

-Wunreachable-code

427

*/

496

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

428

497

safer_gnutls_strerror(ret));

429

498

gnutls_global_deinit();

430

499

return -1;

552

621

gnutls_session_t session;

553

622

int pf; /* Protocol family */

554

623

624

errno = 0;

625

555

626

if(quit_now){

627

errno = EINTR;

556

628

return -1;

557

629

}

558

630

565

637

break;

566

638

default:

567

639

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

640

errno = EINVAL;

568

641

return -1;

569

642

}

570

643

580

653

581

654

tcp_sd = socket(pf, SOCK_STREAM, 0);

582

655

if(tcp_sd < 0){

583

perror("socket");

656

int e = errno;

657

perror_plus("socket");

658

errno = e;

584

659

goto mandos_end;

585

660

}

586

661

587

662

if(quit_now){

663

errno = EINTR;

588

664

goto mandos_end;

589

665

}

590

666

597

673

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

598

674

}

599

675

if(ret < 0 ){

600

perror("inet_pton");

676

int e = errno;

677

perror_plus("inet_pton");

678

errno = e;

601

679

goto mandos_end;

602

680

}

603

681

if(ret == 0){

682

int e = errno;

604

683

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

684

errno = e;

605

685

goto mandos_end;

606

686

}

607

687

if(af == AF_INET6){

615

695

if(if_index == AVAHI_IF_UNSPEC){

616

696

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

617

697

" without a network interface\n");

698

errno = EINVAL;

618

699

goto mandos_end;

619

700

}

620

701

/* Set the network interface number as scope */

627

708

}

628

709

629

710

if(quit_now){

711

errno = EINTR;

630

712

goto mandos_end;

631

713

}

632

714

634

716

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

635

717

char interface[IF_NAMESIZE];

636

718

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

637

perror("if_indextoname");

719

perror_plus("if_indextoname");

638

720

} else {

639

721

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

640

722

ip, interface, port);

654

736

sizeof(addrstr));

655

737

}

656

738

if(pcret == NULL){

657

perror("inet_ntop");

739

perror_plus("inet_ntop");

658

740

} else {

659

741

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

660

742

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

663

745

}

664

746

665

747

if(quit_now){

748

errno = EINTR;

666

749

goto mandos_end;

667

750

}

668

751

672

755

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

673

756

}

674

757

if(ret < 0){

675

perror("connect");

758

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

759

int e = errno;

760

perror_plus("connect");

761

errno = e;

762

}

676

763

goto mandos_end;

677

764

}

678

765

679

766

if(quit_now){

767

errno = EINTR;

680

768

goto mandos_end;

681

769

}

682

770

687

775

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

688

776

out_size - written));

689

777

if(ret == -1){

690

perror("write");

778

int e = errno;

779

perror_plus("write");

780

errno = e;

691

781

goto mandos_end;

692

782

}

693

783

written += (size_t)ret;

703

793

}

704

794

705

795

if(quit_now){

796

errno = EINTR;

706

797

goto mandos_end;

707

798

}

708

799

}

712

803

}

713

804

714

805

if(quit_now){

806

errno = EINTR;

715

807

goto mandos_end;

716

808

}

717

809

810

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

718

811

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

719

812

720

813

if(quit_now){

814

errno = EINTR;

721

815

goto mandos_end;

722

816

}

723

817

724

818

do {

725

819

ret = gnutls_handshake(session);

726

820

if(quit_now){

821

errno = EINTR;

727

822

goto mandos_end;

728

823

}

729

824

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

733

828

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

734

829

gnutls_perror(ret);

735

830

}

831

errno = EPROTO;

736

832

goto mandos_end;

737

833

}

738

834

746

842

while(true){

747

843

748

844

if(quit_now){

845

errno = EINTR;

749

846

goto mandos_end;

750

847

}

751

848

752

849

buffer_capacity = incbuffer(&buffer, buffer_length,

753

850

buffer_capacity);

754

851

if(buffer_capacity == 0){

755

perror("incbuffer");

852

int e = errno;

853

perror_plus("incbuffer");

854

errno = e;

756

855

goto mandos_end;

757

856

}

758

857

759

858

if(quit_now){

859

errno = EINTR;

760

860

goto mandos_end;

761

861

}

762

862

775

875

ret = gnutls_handshake(session);

776

876

777

877

if(quit_now){

878

errno = EINTR;

778

879

goto mandos_end;

779

880

}

780

881

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

781

882

if(ret < 0){

782

883

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

783

884

gnutls_perror(ret);

885

errno = EPROTO;

784

886

goto mandos_end;

785

887

}

786

888

break;

788

890

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

789

891

" encrypted session with Mandos server\n");

790

892

gnutls_bye(session, GNUTLS_SHUT_RDWR);

893

errno = EIO;

791

894

goto mandos_end;

792

895

}

793

896

} else {

800

903

}

801

904

802

905

if(quit_now){

906

errno = EINTR;

803

907

goto mandos_end;

804

908

}

805

909

806

910

do {

807

911

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

808

912

if(quit_now){

913

errno = EINTR;

809

914

goto mandos_end;

810

915

}

811

916

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

820

925

written = 0;

821

926

while(written < (size_t) decrypted_buffer_size){

822

927

if(quit_now){

928

errno = EINTR;

823

929

goto mandos_end;

824

930

}

825

931

827

933

(size_t)decrypted_buffer_size - written,

828

934

stdout);

829

935

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

936

int e = errno;

830

937

if(debug){

831

938

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

832

939

strerror(errno));

833

940

}

941

errno = e;

834

942

goto mandos_end;

835

943

}

836

944

written += (size_t)ret;

842

950

/* Shutdown procedure */

843

951

844

952

mandos_end:

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;

953

{

954

int e = errno;

955

free(decrypted_buffer);

956

free(buffer);

957

if(tcp_sd >= 0){

958

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

959

}

960

if(ret == -1){

961

if(e == 0){

962

e = errno;

963

}

964

perror_plus("close");

965

}

966

gnutls_deinit(session);

967

errno = e;

968

if(quit_now){

969

errno = EINTR;

970

retval = -1;

971

}

856

972

}

857

973

return retval;

858

974

}

901

1017

avahi_proto_to_af(proto));

902

1018

if(ret == 0){

903

1019

avahi_simple_poll_quit(mc.simple_poll);

1020

} else {

1021

ret = add_server(ip, port, interface,

1022

avahi_proto_to_af(proto));

904

1023

}

905

1024

}

906

1025

}

960

1079

}

961

1080

}

962

1081

963

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

1082

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

964

1083

static void handle_sigterm(int sig){

965

1084

if(quit_now){

966

1085

return;

968

1087

quit_now = 1;

969

1088

signal_received = sig;

970

1089

int old_errno = errno;

1090

/* set main loop to exit */

971

1091

if(mc.simple_poll != NULL){

972

1092

avahi_simple_poll_quit(mc.simple_poll);

973

1093

}

974

1094

errno = old_errno;

975

1095

}

976

1096

1097

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

1098

int ret;

1099

1100

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

1101

if(s < 0){

1102

perror_plus("socket");

1103

return false;

1104

}

1105

strcpy(ifr->ifr_name, ifname);

1106

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1107

if(ret == -1){

1108

if(debug){

1109

perror_plus("ioctl SIOCGIFFLAGS");

1110

}

1111

return false;

1112

}

1113

return true;

1114

}

1115

1116

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

1117

1118

/* Reject the loopback device */

1119

if(ifr->ifr_flags & IFF_LOOPBACK){

1120

if(debug){

1121

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

1122

ifname);

1123

}

1124

return false;

1125

}

1126

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

1127

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

1128

if(debug){

1129

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

1130

ifname);

1131

}

1132

return true;

1133

}

1134

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

1135

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

1136

if(debug){

1137

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

1138

ifname);

1139

}

1140

return false;

1141

}

1142

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

1143

if(ifr->ifr_flags & IFF_NOARP){

1144

if(debug){

1145

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

1146

}

1147

return false;

1148

}

1149

1150

/* Accept this device */

1151

if(debug){

1152

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

1153

}

1154

return true;

1155

}

1156

1157

/*

1158

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

1159

* corresponds to an acceptable network device.

1160

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

1161

*/

1162

int good_interface(const struct dirent *if_entry){

1163

int ret;

1164

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

1165

return 0;

1166

}

1167

struct ifreq ifr;

1168

1169

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

1170

return 0;

1171

}

1172

1173

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

1174

return 0;

1175

}

1176

return 1;

1177

}

1178

1179

/*

1180

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

1181

* corresponds to an acceptable network device which is up.

1182

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

1183

*/

1184

int up_interface(const struct dirent *if_entry){

1185

ssize_t ssret;

1186

char *flagname = NULL;

1187

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

1188

return 0;

1189

}

1190

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

1191

if_entry->d_name);

1192

if(ret < 0){

1193

perror_plus("asprintf");

1194

return 0;

1195

}

1196

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

1197

if(flags_fd == -1){

1198

perror_plus("open");

1199

free(flagname);

1200

return 0;

1201

}

1202

free(flagname);

1203

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

1204

/* read line from flags_fd */

1205

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

1206

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

1207

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

1208

if(flagstring == NULL){

1209

perror_plus("malloc");

1210

close(flags_fd);

1211

return 0;

1212

}

1213

while(to_read > 0){

1214

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

1215

(size_t)to_read));

1216

if(ssret == -1){

1217

perror_plus("read");

1218

free(flagstring);

1219

close(flags_fd);

1220

return 0;

1221

}

1222

to_read -= ssret;

1223

if(ssret == 0){

1224

break;

1225

}

1226

}

1227

close(flags_fd);

1228

intmax_t tmpmax;

1229

char *tmp;

1230

errno = 0;

1231

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

1232

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

1233

and not (isspace(*tmp)))

1234

or tmpmax != (ifreq_flags)tmpmax){

1235

if(debug){

1236

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

1237

flagstring, if_entry->d_name);

1238

}

1239

free(flagstring);

1240

return 0;

1241

}

1242

free(flagstring);

1243

ifreq_flags flags = (ifreq_flags)tmpmax;

1244

/* Reject the loopback device */

1245

if(flags & IFF_LOOPBACK){

1246

if(debug){

1247

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

1248

if_entry->d_name);

1249

}

1250

return 0;

1251

}

1252

1253

/* Reject down interfaces */

1254

if(not (flags & IFF_UP)){

1255

return 0;

1256

}

1257

1258

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

1259

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

1260

if(debug){

1261

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

1262

if_entry->d_name);

1263

}

1264

return 1;

1265

}

1266

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

1267

if(not (flags & IFF_BROADCAST)){

1268

if(debug){

1269

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

1270

if_entry->d_name);

1271

}

1272

return 0;

1273

}

1274

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

1275

if(flags & IFF_NOARP){

1276

if(debug){

1277

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

1278

if_entry->d_name);

1279

}

1280

return 0;

1281

}

1282

/* Accept this device */

1283

if(debug){

1284

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

1285

if_entry->d_name);

1286

}

1287

return 1;

1288

}

1289

1290

int notdotentries(const struct dirent *direntry){

1291

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

1292

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

1293

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

1294

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

1295

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

1296

return 0;

1297

}

1298

return 1;

1299

}

1300

1301

/* Is this directory entry a runnable program? */

1302

int runnable_hook(const struct dirent *direntry){

1303

int ret;

1304

struct stat st;

1305

1306

if((direntry->d_name)[0] == '\0'){

1307

/* Empty name? */

1308

return 0;

1309

}

1310

1311

/* Save pointer to last character */

1312

char *end = strchr(direntry->d_name, '\0')-1;

1313

1314

if(*end == '~'){

1315

/* Backup name~ */

1316

return 0;

1317

}

1318

1319

if(((direntry->d_name)[0] == '#')

1320

and (*end == '#')){

1321

/* Temporary #name# */

1322

return 0;

1323

}

1324

1325

/* XXX more rules here */

1326

1327

ret = stat(direntry->d_name, &st);

1328

if(ret == -1){

1329

if(debug){

1330

perror_plus("Could not stat plugin");

1331

}

1332

return 0;

1333

}

1334

if(not (st.st_mode & S_ISREG)){

1335

/* Not a regular file */

1336

return 0;

1337

}

1338

if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){

1339

/* Not executable */

1340

return 0;

1341

}

1342

return 1;

1343

}

1344

1345

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1346

int ret;

1347

struct timespec now;

1348

struct timespec waited_time;

1349

intmax_t block_time;

1350

1351

while(true){

1352

if(mc.current_server == NULL){

1353

if (debug){

1354

fprintf(stderr,

1355

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

1356

}

1357

ret = avahi_simple_poll_iterate(s, -1);

1358

} else {

1359

if (debug){

1360

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

1361

" or wait\n");

1362

}

1363

/* the current time */

1364

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1365

if(ret == -1){

1366

perror_plus("clock_gettime");

1367

return -1;

1368

}

1369

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

1370

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

1371

waited_time.tv_sec = (now.tv_sec

1372

- mc.current_server->last_seen.tv_sec);

1373

waited_time.tv_nsec = (now.tv_nsec

1374

- mc.current_server->last_seen.tv_nsec);

1375

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

1376

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

1377

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

1378

block_time = ((retry_interval

1379

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

1380

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

1381

1382

if (debug){

1383

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

1384

}

1385

1386

if(block_time <= 0){

1387

ret = start_mandos_communication(mc.current_server->ip,

1388

mc.current_server->port,

1389

mc.current_server->if_index,

1390

mc.current_server->af);

1391

if(ret == 0){

1392

avahi_simple_poll_quit(mc.simple_poll);

1393

return 0;

1394

}

1395

ret = clock_gettime(CLOCK_MONOTONIC,

1396

&mc.current_server->last_seen);

1397

if(ret == -1){

1398

perror_plus("clock_gettime");

1399

return -1;

1400

}

1401

mc.current_server = mc.current_server->next;

1402

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

1403

servers, but don't block */

1404

}

1405

1406

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

1407

}

1408

if(ret != 0){

1409

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

1410

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

1411

}

1412

}

1413

}

1414

}

1415

977

1416

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

978

1417

AvahiSServiceBrowser *sb = NULL;

979

1418

int error;

981

1420

intmax_t tmpmax;

982

1421

char *tmp;

983

1422

int exitcode = EXIT_SUCCESS;

984

const char *interface = "eth0";

1423

const char *interface = "";

985

1424

struct ifreq network;

986

1425

int sd = -1;

987

1426

bool take_down_interface = false;

988

1427

uid_t uid;

989

1428

gid_t gid;

990

char *connect_to = NULL;

991

1429

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

992

1430

bool tempdir_created = false;

993

1431

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

997

1435

bool gnutls_initialized = false;

998

1436

bool gpgme_initialized = false;

999

1437

float delay = 2.5f;

1438

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

1439

retrying the same server again */

1000

1440

1001

1441

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1002

1442

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1008

1448

errno = 0;

1009

1449

ret = setgid(gid);

1010

1450

if(ret == -1){

1011

perror("setgid");

1451

perror_plus("setgid");

1012

1452

}

1013

1453

1014

1454

/* Lower user privileges (temporarily) */

1015

1455

errno = 0;

1016

1456

ret = seteuid(uid);

1017

1457

if(ret == -1){

1018

perror("seteuid");

1458

perror_plus("seteuid");

1019

1459

}

1020

1460

1021

1461

if(quit_now){

1056

1496

.arg = "SECONDS",

1057

1497

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

1058

1498

.group = 2 },

1499

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

1500

.arg = "SECONDS",

1501

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

1502

.group = 2 },

1503

/*

1504

* These reproduce what we would get without ARGP_NO_HELP

1505

*/

1506

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

1507

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

1508

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

1509

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

1510

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

1511

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

1059

1512

{ .name = NULL }

1060

1513

};

1061

1514

1062

1515

error_t parse_opt(int key, char *arg,

1063

1516

struct argp_state *state){

1517

errno = 0;

1064

1518

switch(key){

1065

1519

case 128: /* --debug */

1066

1520

debug = true;

1082

1536

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

1083

1537

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

1084

1538

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

1085

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

1086

exit(EXIT_FAILURE);

1539

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

1087

1540

}

1088

1541

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

1089

1542

break;

1094

1547

errno = 0;

1095

1548

delay = strtof(arg, &tmp);

1096

1549

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

1097

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

1098

exit(EXIT_FAILURE);

1550

argp_error(state, "Bad delay");

1551

}

1552

case 132: /* --retry */

1553

errno = 0;

1554

retry_interval = strtod(arg, &tmp);

1555

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

1556

or (retry_interval * 1000) > INT_MAX

1557

or retry_interval < 0){

1558

argp_error(state, "Bad retry interval");

1099

1559

}

1100

1560

break;

1101

case ARGP_KEY_ARG:

1102

argp_usage(state);

1103

case ARGP_KEY_END:

1561

/*

1562

* These reproduce what we would get without ARGP_NO_HELP

1563

*/

1564

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

1565

argp_state_help(state, state->out_stream,

1566

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1567

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1568

case -3: /* --usage */

1569

argp_state_help(state, state->out_stream,

1570

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1571

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

1572

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

1573

exit(argp_err_exit_status);

1104

1574

break;

1105

1575

default:

1106

1576

return ARGP_ERR_UNKNOWN;

1107

1577

}

1108

return 0;

1578

return errno;

1109

1579

}

1110

1580

1111

1581

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

1112

1582

.args_doc = "",

1113

1583

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

1114

1584

" passwords from a Mandos server" };

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;

1119

goto end;

1120

}

1585

ret = argp_parse(&argp, argc, argv,

1586

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1587

switch(ret){

1588

case 0:

1589

break;

1590

case ENOMEM:

1591

default:

1592

errno = ret;

1593

perror_plus("argp_parse");

1594

exitcode = EX_OSERR;

1595

goto end;

1596

case EINVAL:

1597

exitcode = EX_USAGE;

1598

goto end;

1599

}

1600

}

1601

1602

{

1603

/* Work around Debian bug #633582:

1604

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

1605

struct stat st;

1606

1607

/* Re-raise priviliges */

1608

errno = 0;

1609

ret = seteuid(0);

1610

if(ret == -1){

1611

perror_plus("seteuid");

1612

}

1613

1614

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

1615

int seckey_fd = open(seckey, O_RDONLY);

1616

if(seckey_fd == -1){

1617

perror_plus("open");

1618

} else {

1619

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

1620

if(ret == -1){

1621

perror_plus("fstat");

1622

} else {

1623

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

1624

ret = fchown(seckey_fd, uid, gid);

1625

if(ret == -1){

1626

perror_plus("fchown");

1627

}

1628

}

1629

}

1630

TEMP_FAILURE_RETRY(close(seckey_fd));

1631

}

1632

}

1633

1634

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

1635

int pubkey_fd = open(pubkey, O_RDONLY);

1636

if(pubkey_fd == -1){

1637

perror_plus("open");

1638

} else {

1639

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

1640

if(ret == -1){

1641

perror_plus("fstat");

1642

} else {

1643

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

1644

ret = fchown(pubkey_fd, uid, gid);

1645

if(ret == -1){

1646

perror_plus("fchown");

1647

}

1648

}

1649

}

1650

TEMP_FAILURE_RETRY(close(pubkey_fd));

1651

}

1652

}

1653

1654

/* Lower privileges */

1655

errno = 0;

1656

ret = seteuid(uid);

1657

if(ret == -1){

1658

perror_plus("seteuid");

1659

}

1660

}

1661

1662

/* Find network hooks and run them */

1663

{

1664

struct dirent **direntries;

1665

struct dirent *direntry;

1666

int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,

1667

alphasort);

1668

int devnull = open("/dev/null", O_RDONLY);

1669

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

1670

direntry = direntries[0];

1671

char *fullname = NULL;

1672

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

1673

direntry->d_name);

1674

if(ret < 0){

1675

perror_plus("asprintf");

1676

continue;

1677

}

1678

pid_t hook_pid = fork();

1679

if(hook_pid == 0){

1680

/* Child */

1681

dup2(devnull, STDIN_FILENO);

1682

close(devnull);

1683

dup2(STDERR_FILENO, STDOUT_FILENO);

1684

setenv("DEVICE", interface, 1);

1685

setenv("VERBOSE", debug ? "1" : "0", 1);

1686

setenv("MODE", "start", 1);

1687

/* setenv( XXX more here */

1688

ret = execl(fullname, direntry->d_name, "start");

1689

perror_plus("execl");

1690

}

1691

free(fullname);

1692

if(quit_now){

1693

goto end;

1694

}

1695

}

1696

close(devnull);

1121

1697

}

1122

1698

1123

1699

if(not debug){

1124

1700

avahi_set_log_function(empty_log);

1125

1701

}

1126

1702

1703

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

1704

struct dirent **direntries;

1705

ret = scandir(sys_class_net, &direntries, good_interface,

1706

alphasort);

1707

if(ret >= 1){

1708

/* Pick the first good interface */

1709

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

1710

if(debug){

1711

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

1712

}

1713

if(interface == NULL){

1714

perror_plus("malloc");

1715

free(direntries);

1716

exitcode = EXIT_FAILURE;

1717

goto end;

1718

}

1719

free(direntries);

1720

} else {

1721

free(direntries);

1722

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

1723

exitcode = EXIT_FAILURE;

1724

goto end;

1725

}

1726

}

1727

1127

1728

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

1128

1729

from the signal handler */

1129

1730

/* Initialize the pseudo-RNG for Avahi */

1131

1732

mc.simple_poll = avahi_simple_poll_new();

1132

1733

if(mc.simple_poll == NULL){

1133

1734

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

1134

exitcode = EXIT_FAILURE;

1735

exitcode = EX_UNAVAILABLE;

1135

1736

goto end;

1136

1737

}

1137

1738

1138

1739

sigemptyset(&sigterm_action.sa_mask);

1139

1740

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

1140

1741

if(ret == -1){

1141

perror("sigaddset");

1142

exitcode = EXIT_FAILURE;

1742

perror_plus("sigaddset");

1743

exitcode = EX_OSERR;

1143

1744

goto end;

1144

1745

}

1145

1746

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

1146

1747

if(ret == -1){

1147

perror("sigaddset");

1148

exitcode = EXIT_FAILURE;

1748

perror_plus("sigaddset");

1749

exitcode = EX_OSERR;

1149

1750

goto end;

1150

1751

}

1151

1752

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

1152

1753

if(ret == -1){

1153

perror("sigaddset");

1154

exitcode = EXIT_FAILURE;

1754

perror_plus("sigaddset");

1755

exitcode = EX_OSERR;

1155

1756

goto end;

1156

1757

}

1157

1758

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

1160

1761

*/

1161

1762

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

1162

1763

if(ret == -1){

1163

perror("sigaction");

1164

return EXIT_FAILURE;

1764

perror_plus("sigaction");

1765

return EX_OSERR;

1165

1766

}

1166

1767

if(old_sigterm_action.sa_handler != SIG_IGN){

1167

1768

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

1168

1769

if(ret == -1){

1169

perror("sigaction");

1170

exitcode = EXIT_FAILURE;

1770

perror_plus("sigaction");

1771

exitcode = EX_OSERR;

1171

1772

goto end;

1172

1773

}

1173

1774

}

1174

1775

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

1175

1776

if(ret == -1){

1176

perror("sigaction");

1177

return EXIT_FAILURE;

1777

perror_plus("sigaction");

1778

return EX_OSERR;

1178

1779

}

1179

1780

if(old_sigterm_action.sa_handler != SIG_IGN){

1180

1781

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

1181

1782

if(ret == -1){

1182

perror("sigaction");

1183

exitcode = EXIT_FAILURE;

1783

perror_plus("sigaction");

1784

exitcode = EX_OSERR;

1184

1785

goto end;

1185

1786

}

1186

1787

}

1187

1788

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

1188

1789

if(ret == -1){

1189

perror("sigaction");

1190

return EXIT_FAILURE;

1790

perror_plus("sigaction");

1791

return EX_OSERR;

1191

1792

}

1192

1793

if(old_sigterm_action.sa_handler != SIG_IGN){

1193

1794

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

1194

1795

if(ret == -1){

1195

perror("sigaction");

1196

exitcode = EXIT_FAILURE;

1796

perror_plus("sigaction");

1797

exitcode = EX_OSERR;

1197

1798

goto end;

1198

1799

}

1199

1800

}

1200

1801

1201

1802

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

1202

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

1803

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

1203

1804

if_index = (AvahiIfIndex) if_nametoindex(interface);

1204

1805

if(if_index == 0){

1205

1806

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

1206

exitcode = EXIT_FAILURE;

1807

exitcode = EX_UNAVAILABLE;

1207

1808

goto end;

1208

1809

}

1209

1810

1215

1816

errno = 0;

1216

1817

ret = seteuid(0);

1217

1818

if(ret == -1){

1218

perror("seteuid");

1819

perror_plus("seteuid");

1219

1820

}

1220

1821

1221

1822

#ifdef __linux__

1222

1823

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1223

messages to mess up the prompt */

1824

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

1224

1825

ret = klogctl(8, NULL, 5);

1225

1826

bool restore_loglevel = true;

1226

1827

if(ret == -1){

1227

1828

restore_loglevel = false;

1228

perror("klogctl");

1829

perror_plus("klogctl");

1229

1830

}

1230

1831

#endif /* __linux__ */

1231

1832

1232

1833

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1233

1834

if(sd < 0){

1234

perror("socket");

1235

exitcode = EXIT_FAILURE;

1835

perror_plus("socket");

1836

exitcode = EX_OSERR;

1236

1837

#ifdef __linux__

1237

1838

if(restore_loglevel){

1238

1839

ret = klogctl(7, NULL, 0);

1239

1840

if(ret == -1){

1240

perror("klogctl");

1841

perror_plus("klogctl");

1241

1842

}

1242

1843

}

1243

1844

#endif /* __linux__ */

1245

1846

errno = 0;

1246

1847

ret = seteuid(uid);

1247

1848

if(ret == -1){

1248

perror("seteuid");

1849

perror_plus("seteuid");

1249

1850

}

1250

1851

goto end;

1251

1852

}

1252

1853

strcpy(network.ifr_name, interface);

1253

1854

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

1254

1855

if(ret == -1){

1255

perror("ioctl SIOCGIFFLAGS");

1856

perror_plus("ioctl SIOCGIFFLAGS");

1256

1857

#ifdef __linux__

1257

1858

if(restore_loglevel){

1258

1859

ret = klogctl(7, NULL, 0);

1259

1860

if(ret == -1){

1260

perror("klogctl");

1861

perror_plus("klogctl");

1261

1862

}

1262

1863

}

1263

1864

#endif /* __linux__ */

1264

exitcode = EXIT_FAILURE;

1865

exitcode = EX_OSERR;

1265

1866

/* Lower privileges */

1266

1867

errno = 0;

1267

1868

ret = seteuid(uid);

1268

1869

if(ret == -1){

1269

perror("seteuid");

1870

perror_plus("seteuid");

1270

1871

}

1271

1872

goto end;

1272

1873

}

1276

1877

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

1277

1878

if(ret == -1){

1278

1879

take_down_interface = false;

1279

perror("ioctl SIOCSIFFLAGS");

1280

exitcode = EXIT_FAILURE;

1880

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1881

exitcode = EX_OSERR;

1281

1882

#ifdef __linux__

1282

1883

if(restore_loglevel){

1283

1884

ret = klogctl(7, NULL, 0);

1284

1885

if(ret == -1){

1285

perror("klogctl");

1886

perror_plus("klogctl");

1286

1887

}

1287

1888

}

1288

1889

#endif /* __linux__ */

1290

1891

errno = 0;

1291

1892

ret = seteuid(uid);

1292

1893

if(ret == -1){

1293

perror("seteuid");

1894

perror_plus("seteuid");

1294

1895

}

1295

1896

goto end;

1296

1897

}

1297

1898

}

1298

/* sleep checking until interface is running */

1899

/* Sleep checking until interface is running.

1900

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

1299

1901

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

1300

1902

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

1301

1903

if(ret == -1){

1302

perror("ioctl SIOCGIFFLAGS");

1904

perror_plus("ioctl SIOCGIFFLAGS");

1303

1905

} else if(network.ifr_flags & IFF_RUNNING){

1304

1906

break;

1305

1907

}

1306

1908

struct timespec sleeptime = { .tv_nsec = 250000000 };

1307

1909

ret = nanosleep(&sleeptime, NULL);

1308

1910

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

1309

perror("nanosleep");

1911

perror_plus("nanosleep");

1310

1912

}

1311

1913

}

1312

1914

if(not take_down_interface){

1313

1915

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

1314

1916

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

1315

1917

if(ret == -1){

1316

perror("close");

1918

perror_plus("close");

1317

1919

}

1318

1920

}

1319

1921

#ifdef __linux__

1321

1923

/* Restores kernel loglevel to default */

1322

1924

ret = klogctl(7, NULL, 0);

1323

1925

if(ret == -1){

1324

perror("klogctl");

1926

perror_plus("klogctl");

1325

1927

}

1326

1928

}

1327

1929

#endif /* __linux__ */

1331

1933

/* Lower privileges */

1332

1934

ret = seteuid(uid);

1333

1935

if(ret == -1){

1334

perror("seteuid");

1936

perror_plus("seteuid");

1335

1937

}

1336

1938

} else {

1337

1939

/* Lower privileges permanently */

1338

1940

ret = setuid(uid);

1339

1941

if(ret == -1){

1340

perror("setuid");

1942

perror_plus("setuid");

1341

1943

}

1342

1944

}

1343

1945

}

1349

1951

ret = init_gnutls_global(pubkey, seckey);

1350

1952

if(ret == -1){

1351

1953

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

1352

exitcode = EXIT_FAILURE;

1954

exitcode = EX_UNAVAILABLE;

1353

1955

goto end;

1354

1956

} else {

1355

1957

gnutls_initialized = true;

1359

1961

goto end;

1360

1962

}

1361

1963

1964

if(mkdtemp(tempdir) == NULL){

1965

perror_plus("mkdtemp");

1966

goto end;

1967

}

1362

1968

tempdir_created = true;

1363

if(mkdtemp(tempdir) == NULL){

1364

tempdir_created = false;

1365

perror("mkdtemp");

1366

goto end;

1367

}

1368

1969

1369

1970

if(quit_now){

1370

1971

goto end;

1372

1973

1373

1974

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

1374

1975

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

1375

exitcode = EXIT_FAILURE;

1976

exitcode = EX_UNAVAILABLE;

1376

1977

goto end;

1377

1978

} else {

1378

1979

gpgme_initialized = true;

1388

1989

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

1389

1990

if(address == NULL){

1390

1991

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

1391

exitcode = EXIT_FAILURE;

1992

exitcode = EX_USAGE;

1392

1993

goto end;

1393

1994

}

1394

1995

1402

2003

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

1403

2004

or tmpmax != (uint16_t)tmpmax){

1404

2005

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

1405

exitcode = EXIT_FAILURE;

2006

exitcode = EX_USAGE;

1406

2007

goto end;

1407

2008

}

1408

2009

1412

2013

1413

2014

port = (uint16_t)tmpmax;

1414

2015

*address = '\0';

1415

address = connect_to;

1416

2016

/* Colon in address indicates IPv6 */

1417

2017

int af;

1418

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

2018

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

1419

2019

af = AF_INET6;

2020

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

2021

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

2022

{

2023

connect_to++;

2024

address[-1] = '\0';

2025

}

1420

2026

} else {

1421

2027

af = AF_INET;

1422

2028

}

2029

address = connect_to;

1423

2030

1424

2031

if(quit_now){

1425

2032

goto end;

1426

2033

}

1427

2034

1428

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

1429

if(ret < 0){

1430

exitcode = EXIT_FAILURE;

1431

} else {

2035

while(not quit_now){

2036

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

2037

if(quit_now or ret == 0){

2038

break;

2039

}

2040

if(debug){

2041

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

2042

(int)retry_interval);

2043

}

2044

sleep((int)retry_interval);

2045

}

2046

2047

if (not quit_now){

1432

2048

exitcode = EXIT_SUCCESS;

1433

2049

}

2050

1434

2051

goto end;

1435

2052

}

1436

2053

1460

2077

if(mc.server == NULL){

1461

2078

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

1462

2079

avahi_strerror(error));

1463

exitcode = EXIT_FAILURE;

2080

exitcode = EX_UNAVAILABLE;

1464

2081

goto end;

1465

2082

}

1466

2083

1475

2092

if(sb == NULL){

1476

2093

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

1477

2094

avahi_strerror(avahi_server_errno(mc.server)));

1478

exitcode = EXIT_FAILURE;

2095

exitcode = EX_UNAVAILABLE;

1479

2096

goto end;

1480

2097

}

1481

2098

1488

2105

if(debug){

1489

2106

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

1490

2107

}

1491

1492

avahi_simple_poll_loop(mc.simple_poll);

2108

2109

ret = avahi_loop_with_timeout(mc.simple_poll,

2110

(int)(retry_interval * 1000));

2111

if(debug){

2112

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

2113

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

2114

}

1493

2115

1494

2116

end:

1495

2117

1516

2138

if(gpgme_initialized){

1517

2139

gpgme_release(mc.ctx);

1518

2140

}

2141

2142

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

2143

has seen */

2144

if(mc.current_server != NULL){

2145

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

2146

while(mc.current_server != NULL){

2147

server *next = mc.current_server->next;

2148

free(mc.current_server);

2149

mc.current_server = next;

2150

}

2151

}

2152

2153

/* XXX run network hooks "stop" here */

1519

2154

1520

2155

/* Take down the network interface */

1521

2156

if(take_down_interface){

1523

2158

errno = 0;

1524

2159

ret = seteuid(0);

1525

2160

if(ret == -1){

1526

perror("seteuid");

2161

perror_plus("seteuid");

1527

2162

}

1528

2163

if(geteuid() == 0){

1529

2164

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

1530

2165

if(ret == -1){

1531

perror("ioctl SIOCGIFFLAGS");

2166

perror_plus("ioctl SIOCGIFFLAGS");

1532

2167

} else if(network.ifr_flags & IFF_UP) {

1533

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

2168

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

1534

2169

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

1535

2170

if(ret == -1){

1536

perror("ioctl SIOCSIFFLAGS");

2171

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1537

2172

}

1538

2173

}

1539

2174

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

1540

2175

if(ret == -1){

1541

perror("close");

2176

perror_plus("close");

1542

2177

}

1543

2178

/* Lower privileges permanently */

1544

2179

errno = 0;

1545

2180

ret = setuid(uid);

1546

2181

if(ret == -1){

1547

perror("setuid");

2182

perror_plus("setuid");

1548

2183

}

1549

2184

}

1550

2185

}

1551

2186

1552

/* Removes the temp directory used by GPGME */

2187

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

1553

2188

if(tempdir_created){

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

}

2189

struct dirent **direntries = NULL;

2190

struct dirent *direntry = NULL;

2191

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

2192

alphasort);

2193

if (numentries > 0){

2194

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

2195

direntry = direntries[i];

1574

2196

char *fullname = NULL;

1575

2197

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

1576

2198

direntry->d_name);

1577

2199

if(ret < 0){

1578

perror("asprintf");

2200

perror_plus("asprintf");

1579

2201

continue;

1580

2202

}

1581

2203

ret = remove(fullname);

1585

2207

}

1586

2208

free(fullname);

1587

2209

}

1588

closedir(d);

2210

}

2211

2212

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

2213

free(direntries);

2214

if (numentries == -1){

2215

perror_plus("scandir");

1589

2216

}

1590

2217

ret = rmdir(tempdir);

1591

2218

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

1592

perror("rmdir");

2219

perror_plus("rmdir");

1593

2220

}

1594

2221

}

1595

2222

1600

2227

&old_sigterm_action,

1601

2228

NULL));

1602

2229

if(ret == -1){

1603

perror("sigaction");

2230

perror_plus("sigaction");

1604

2231

}

1605

2232

do {

1606

2233

ret = raise(signal_received);

1607

2234

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

1608

2235

if(ret != 0){

1609

perror("raise");

2236

perror_plus("raise");

1610

2237

abort();

1611

2238

}

1612

2239

TEMP_FAILURE_RETRY(pause());