/mandos/trunk : revision 505.2.3

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() */

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 */

72

73

*/

73

74

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

74

75

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

75

setgid() */

76

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

76

setgid(), pause() */

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 };

163

164

sig_atomic_t quit_now = 0;

165

int signal_received = 0;

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

}

144

173

145

174

/*

146

175

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

159

188

return buffer_capacity;

160

189

}

161

190

191

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

192

int add_server(const char *ip, uint16_t port,

193

AvahiIfIndex if_index,

194

int af){

195

int ret;

196

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

197

if(new_server == NULL){

198

perror_plus("malloc");

199

return -1;

200

}

201

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

202

.port = port,

203

.if_index = if_index,

204

.af = af };

205

if(new_server->ip == NULL){

206

perror_plus("strdup");

207

return -1;

208

}

209

/* Special case of first server */

210

if (mc.current_server == NULL){

211

new_server->next = new_server;

212

new_server->prev = new_server;

213

mc.current_server = new_server;

214

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

215

} else {

216

new_server->next = mc.current_server;

217

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

218

new_server->prev->next = new_server;

219

mc.current_server->prev = new_server;

220

}

221

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

222

if(ret == -1){

223

perror_plus("clock_gettime");

224

return -1;

225

}

226

return 0;

227

}

228

162

229

/*

163

230

* Initialize GPGME.

164

231

*/

178

245

179

246

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

180

247

if(fd == -1){

181

perror("open");

248

perror_plus("open");

182

249

return false;

183

250

}

184

251

198

265

199

266

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

200

267

if(ret == -1){

201

perror("close");

268

perror_plus("close");

202

269

}

203

270

gpgme_data_release(pgp_data);

204

271

return true;

217

284

return false;

218

285

}

219

286

220

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

287

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

221

288

rc = gpgme_get_engine_info(&engine_info);

222

289

if(rc != GPG_ERR_NO_ERROR){

223

290

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

329

396

330

397

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

331

398

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

332

perror("gpgme_data_seek");

399

perror_plus("gpgme_data_seek");

333

400

plaintext_length = -1;

334

401

goto decrypt_end;

335

402

}

340

407

(size_t)plaintext_length,

341

408

plaintext_capacity);

342

409

if(plaintext_capacity == 0){

343

perror("incbuffer");

410

perror_plus("incbuffer");

344

411

plaintext_length = -1;

345

412

goto decrypt_end;

346

413

}

353

420

break;

354

421

}

355

422

if(ret < 0){

356

perror("gpgme_data_read");

423

perror_plus("gpgme_data_read");

357

424

plaintext_length = -1;

358

425

goto decrypt_end;

359

426

}

416

483

}

417

484

418

485

/* OpenPGP credentials */

419

gnutls_certificate_allocate_credentials(&mc.cred);

486

ret = gnutls_certificate_allocate_credentials(&mc.cred);

420

487

if(ret != GNUTLS_E_SUCCESS){

421

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

422

from

423

-Wunreachable-code

424

*/

488

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

425

489

safer_gnutls_strerror(ret));

426

490

gnutls_global_deinit();

427

491

return -1;

476

540

/* GnuTLS session creation */

477

541

do {

478

542

ret = gnutls_init(session, GNUTLS_SERVER);

543

if(quit_now){

544

return -1;

545

}

479

546

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

480

547

if(ret != GNUTLS_E_SUCCESS){

481

548

fprintf(stderr, "Error in GnuTLS session initialization: %s\n",

486

553

const char *err;

487

554

do {

488

555

ret = gnutls_priority_set_direct(*session, mc.priority, &err);

556

if(quit_now){

557

gnutls_deinit(*session);

558

return -1;

559

}

489

560

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

490

561

if(ret != GNUTLS_E_SUCCESS){

491

562

fprintf(stderr, "Syntax error at: %s\n", err);

499

570

do {

500

571

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

501

572

mc.cred);

573

if(quit_now){

574

gnutls_deinit(*session);

575

return -1;

576

}

502

577

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

503

578

if(ret != GNUTLS_E_SUCCESS){

504

579

fprintf(stderr, "Error setting GnuTLS credentials: %s\n",

519

594

static void empty_log(__attribute__((unused)) AvahiLogLevel level,

520

595

__attribute__((unused)) const char *txt){}

521

596

522

sig_atomic_t quit_now = 0;

523

int signal_received = 0;

524

525

597

/* Called when a Mandos server is found */

526

598

static int start_mandos_communication(const char *ip, uint16_t port,

527

599

AvahiIfIndex if_index,

533

605

struct sockaddr_in6 in6;

534

606

} to;

535

607

char *buffer = NULL;

536

char *decrypted_buffer;

608

char *decrypted_buffer = NULL;

537

609

size_t buffer_length = 0;

538

610

size_t buffer_capacity = 0;

539

611

size_t written;

540

int retval = 0;

612

int retval = -1;

541

613

gnutls_session_t session;

542

614

int pf; /* Protocol family */

543

615

616

errno = 0;

617

544

618

if(quit_now){

619

errno = EINTR;

545

620

return -1;

546

621

}

547

622

554

629

break;

555

630

default:

556

631

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

632

errno = EINVAL;

557

633

return -1;

558

634

}

559

635

569

645

570

646

tcp_sd = socket(pf, SOCK_STREAM, 0);

571

647

if(tcp_sd < 0){

572

perror("socket");

573

retval = -1;

648

int e = errno;

649

perror_plus("socket");

650

errno = e;

574

651

goto mandos_end;

575

652

}

576

653

577

654

if(quit_now){

655

errno = EINTR;

578

656

goto mandos_end;

579

657

}

580

658

587

665

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

588

666

}

589

667

if(ret < 0 ){

590

perror("inet_pton");

591

retval = -1;

668

int e = errno;

669

perror_plus("inet_pton");

670

errno = e;

592

671

goto mandos_end;

593

672

}

594

673

if(ret == 0){

674

int e = errno;

595

675

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

596

retval = -1;

676

errno = e;

597

677

goto mandos_end;

598

678

}

599

679

if(af == AF_INET6){

607

687

if(if_index == AVAHI_IF_UNSPEC){

608

688

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

609

689

" without a network interface\n");

610

retval = -1;

690

errno = EINVAL;

611

691

goto mandos_end;

612

692

}

613

693

/* Set the network interface number as scope */

620

700

}

621

701

622

702

if(quit_now){

703

errno = EINTR;

623

704

goto mandos_end;

624

705

}

625

706

627

708

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

628

709

char interface[IF_NAMESIZE];

629

710

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

630

perror("if_indextoname");

711

perror_plus("if_indextoname");

631

712

} else {

632

713

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

633

714

ip, interface, port);

647

728

sizeof(addrstr));

648

729

}

649

730

if(pcret == NULL){

650

perror("inet_ntop");

731

perror_plus("inet_ntop");

651

732

} else {

652

733

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

653

734

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

656

737

}

657

738

658

739

if(quit_now){

740

errno = EINTR;

659

741

goto mandos_end;

660

742

}

661

743

665

747

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

666

748

}

667

749

if(ret < 0){

668

perror("connect");

669

retval = -1;

750

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

751

int e = errno;

752

perror_plus("connect");

753

errno = e;

754

}

670

755

goto mandos_end;

671

756

}

672

757

673

758

if(quit_now){

759

errno = EINTR;

674

760

goto mandos_end;

675

761

}

676

762

681

767

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

682

768

out_size - written));

683

769

if(ret == -1){

684

perror("write");

685

retval = -1;

770

int e = errno;

771

perror_plus("write");

772

errno = e;

686

773

goto mandos_end;

687

774

}

688

775

written += (size_t)ret;

698

785

}

699

786

700

787

if(quit_now){

788

errno = EINTR;

701

789

goto mandos_end;

702

790

}

703

791

}

707

795

}

708

796

709

797

if(quit_now){

798

errno = EINTR;

710

799

goto mandos_end;

711

800

}

712

801

802

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

713

803

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

714

804

715

805

if(quit_now){

806

errno = EINTR;

716

807

goto mandos_end;

717

808

}

718

809

719

810

do {

720

811

ret = gnutls_handshake(session);

721

812

if(quit_now){

813

errno = EINTR;

722

814

goto mandos_end;

723

815

}

724

816

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

728

820

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

729

821

gnutls_perror(ret);

730

822

}

731

retval = -1;

823

errno = EPROTO;

732

824

goto mandos_end;

733

825

}

734

826

742

834

while(true){

743

835

744

836

if(quit_now){

837

errno = EINTR;

745

838

goto mandos_end;

746

839

}

747

840

748

841

buffer_capacity = incbuffer(&buffer, buffer_length,

749

842

buffer_capacity);

750

843

if(buffer_capacity == 0){

751

perror("incbuffer");

752

retval = -1;

844

int e = errno;

845

perror_plus("incbuffer");

846

errno = e;

753

847

goto mandos_end;

754

848

}

755

849

756

850

if(quit_now){

851

errno = EINTR;

757

852

goto mandos_end;

758

853

}

759

854

772

867

ret = gnutls_handshake(session);

773

868

774

869

if(quit_now){

870

errno = EINTR;

775

871

goto mandos_end;

776

872

}

777

873

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

778

874

if(ret < 0){

779

875

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

780

876

gnutls_perror(ret);

781

retval = -1;

877

errno = EPROTO;

782

878

goto mandos_end;

783

879

}

784

880

break;

785

881

default:

786

882

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

787

883

" encrypted session with Mandos server\n");

788

retval = -1;

789

884

gnutls_bye(session, GNUTLS_SHUT_RDWR);

885

errno = EIO;

790

886

goto mandos_end;

791

887

}

792

888

} else {

799

895

}

800

896

801

897

if(quit_now){

802

goto mandos_end;

803

}

804

805

gnutls_bye(session, GNUTLS_SHUT_RDWR);

806

807

if(quit_now){

808

goto mandos_end;

809

}

898

errno = EINTR;

899

goto mandos_end;

900

}

901

902

do {

903

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

904

if(quit_now){

905

errno = EINTR;

906

goto mandos_end;

907

}

908

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

810

909

811

910

if(buffer_length > 0){

812

911

ssize_t decrypted_buffer_size;

818

917

written = 0;

819

918

while(written < (size_t) decrypted_buffer_size){

820

919

if(quit_now){

920

errno = EINTR;

821

921

goto mandos_end;

822

922

}

823

923

825

925

(size_t)decrypted_buffer_size - written,

826

926

stdout);

827

927

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

928

int e = errno;

828

929

if(debug){

829

930

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

830

931

strerror(errno));

831

932

}

832

retval = -1;

833

break;

933

errno = e;

934

goto mandos_end;

834

935

}

835

936

written += (size_t)ret;

836

937

}

837

free(decrypted_buffer);

838

} else {

839

retval = -1;

938

retval = 0;

840

939

}

841

} else {

842

retval = -1;

843

940

}

844

941

845

942

/* Shutdown procedure */

846

943

847

944

mandos_end:

848

free(buffer);

849

if(tcp_sd >= 0){

850

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

851

}

852

if(ret == -1){

853

perror("close");

854

}

855

gnutls_deinit(session);

856

if(quit_now){

857

retval = -1;

945

{

946

int e = errno;

947

free(decrypted_buffer);

948

free(buffer);

949

if(tcp_sd >= 0){

950

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

951

}

952

if(ret == -1){

953

if(e == 0){

954

e = errno;

955

}

956

perror_plus("close");

957

}

958

gnutls_deinit(session);

959

errno = e;

960

if(quit_now){

961

errno = EINTR;

962

retval = -1;

963

}

858

964

}

859

965

return retval;

860

966

}

903

1009

avahi_proto_to_af(proto));

904

1010

if(ret == 0){

905

1011

avahi_simple_poll_quit(mc.simple_poll);

1012

} else {

1013

ret = add_server(ip, port, interface,

1014

avahi_proto_to_af(proto));

906

1015

}

907

1016

}

908

1017

}

962

1071

}

963

1072

}

964

1073

965

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

1074

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

966

1075

static void handle_sigterm(int sig){

967

1076

if(quit_now){

968

1077

return;

970

1079

quit_now = 1;

971

1080

signal_received = sig;

972

1081

int old_errno = errno;

1082

/* set main loop to exit */

973

1083

if(mc.simple_poll != NULL){

974

1084

avahi_simple_poll_quit(mc.simple_poll);

975

1085

}

976

1086

errno = old_errno;

977

1087

}

978

1088

1089

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

1090

int ret;

1091

1092

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

1093

if(s < 0){

1094

perror_plus("socket");

1095

return false;

1096

}

1097

strcpy(ifr->ifr_name, ifname);

1098

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1099

if(ret == -1){

1100

if(debug){

1101

perror_plus("ioctl SIOCGIFFLAGS");

1102

}

1103

return false;

1104

}

1105

return true;

1106

}

1107

1108

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

1109

1110

/* Reject the loopback device */

1111

if(ifr->ifr_flags & IFF_LOOPBACK){

1112

if(debug){

1113

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

1114

ifname);

1115

}

1116

return false;

1117

}

1118

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

1119

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

1120

if(debug){

1121

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

1122

ifname);

1123

}

1124

return true;

1125

}

1126

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

1127

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

1128

if(debug){

1129

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

1130

ifname);

1131

}

1132

return false;

1133

}

1134

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

1135

if(ifr->ifr_flags & IFF_NOARP){

1136

if(debug){

1137

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

1138

}

1139

return false;

1140

}

1141

1142

/* Accept this device */

1143

if(debug){

1144

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

1145

}

1146

return true;

1147

}

1148

1149

/*

1150

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

1151

* corresponds to an acceptable network device.

1152

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

1153

*/

1154

int good_interface(const struct dirent *if_entry){

1155

int ret;

1156

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

1157

return 0;

1158

}

1159

struct ifreq ifr;

1160

1161

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

1162

return 0;

1163

}

1164

1165

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

1166

return 0;

1167

}

1168

return 1;

1169

}

1170

1171

/*

1172

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

1173

* corresponds to an acceptable network device which is up.

1174

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

1175

*/

1176

int up_interface(const struct dirent *if_entry){

1177

ssize_t ssret;

1178

char *flagname = NULL;

1179

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

1180

return 0;

1181

}

1182

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

1183

if_entry->d_name);

1184

if(ret < 0){

1185

perror_plus("asprintf");

1186

return 0;

1187

}

1188

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

1189

if(flags_fd == -1){

1190

perror_plus("open");

1191

free(flagname);

1192

return 0;

1193

}

1194

free(flagname);

1195

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

1196

/* read line from flags_fd */

1197

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

1198

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

1199

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

1200

if(flagstring == NULL){

1201

perror_plus("malloc");

1202

close(flags_fd);

1203

return 0;

1204

}

1205

while(to_read > 0){

1206

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

1207

(size_t)to_read));

1208

if(ssret == -1){

1209

perror_plus("read");

1210

free(flagstring);

1211

close(flags_fd);

1212

return 0;

1213

}

1214

to_read -= ssret;

1215

if(ssret == 0){

1216

break;

1217

}

1218

}

1219

close(flags_fd);

1220

intmax_t tmpmax;

1221

char *tmp;

1222

errno = 0;

1223

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

1224

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

1225

and not (isspace(*tmp)))

1226

or tmpmax != (ifreq_flags)tmpmax){

1227

if(debug){

1228

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

1229

flagstring, if_entry->d_name);

1230

}

1231

free(flagstring);

1232

return 0;

1233

}

1234

free(flagstring);

1235

ifreq_flags flags = (ifreq_flags)tmpmax;

1236

/* Reject the loopback device */

1237

if(flags & IFF_LOOPBACK){

1238

if(debug){

1239

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

1240

if_entry->d_name);

1241

}

1242

return 0;

1243

}

1244

1245

/* Reject down interfaces */

1246

if(not (flags & IFF_UP)){

1247

return 0;

1248

}

1249

1250

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

1251

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

1252

if(debug){

1253

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

1254

if_entry->d_name);

1255

}

1256

return 1;

1257

}

1258

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

1259

if(not (flags & IFF_BROADCAST)){

1260

if(debug){

1261

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

1262

if_entry->d_name);

1263

}

1264

return 0;

1265

}

1266

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

1267

if(flags & IFF_NOARP){

1268

if(debug){

1269

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

1270

if_entry->d_name);

1271

}

1272

return 0;

1273

}

1274

/* Accept this device */

1275

if(debug){

1276

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

1277

if_entry->d_name);

1278

}

1279

return 1;

1280

}

1281

1282

int notdotentries(const struct dirent *direntry){

1283

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

1284

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

1285

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

1286

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

1287

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

1288

return 0;

1289

}

1290

return 1;

1291

}

1292

1293

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

1294

int runnable_hook(const struct dirent *direntry){

1295

int ret;

1296

struct stat st;

1297

1298

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

1299

/* Empty name? */

1300

return 0;

1301

}

1302

1303

/* Save pointer to last character */

1304

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

1305

1306

if(*end == '~'){

1307

/* Backup name~ */

1308

return 0;

1309

}

1310

1311

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

1312

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

1313

/* Temporary #name# */

1314

return 0;

1315

}

1316

1317

/* XXX more rules here */

1318

1319

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

1320

if(ret == -1){

1321

if(debug){

1322

perror_plus("Could not stat plugin");

1323

}

1324

return 0;

1325

}

1326

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

1327

/* Not a regular file */

1328

return 0;

1329

}

1330

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

1331

/* Not executable */

1332

return 0;

1333

}

1334

return 1;

1335

}

1336

1337

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1338

int ret;

1339

struct timespec now;

1340

struct timespec waited_time;

1341

intmax_t block_time;

1342

1343

while(true){

1344

if(mc.current_server == NULL){

1345

if (debug){

1346

fprintf(stderr,

1347

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

1348

}

1349

ret = avahi_simple_poll_iterate(s, -1);

1350

} else {

1351

if (debug){

1352

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

1353

" or wait\n");

1354

}

1355

/* the current time */

1356

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1357

if(ret == -1){

1358

perror_plus("clock_gettime");

1359

return -1;

1360

}

1361

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

1362

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

1363

waited_time.tv_sec = (now.tv_sec

1364

- mc.current_server->last_seen.tv_sec);

1365

waited_time.tv_nsec = (now.tv_nsec

1366

- mc.current_server->last_seen.tv_nsec);

1367

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

1368

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

1369

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

1370

block_time = ((retry_interval

1371

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

1372

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

1373

1374

if (debug){

1375

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

1376

}

1377

1378

if(block_time <= 0){

1379

ret = start_mandos_communication(mc.current_server->ip,

1380

mc.current_server->port,

1381

mc.current_server->if_index,

1382

mc.current_server->af);

1383

if(ret == 0){

1384

avahi_simple_poll_quit(mc.simple_poll);

1385

return 0;

1386

}

1387

ret = clock_gettime(CLOCK_MONOTONIC,

1388

&mc.current_server->last_seen);

1389

if(ret == -1){

1390

perror_plus("clock_gettime");

1391

return -1;

1392

}

1393

mc.current_server = mc.current_server->next;

1394

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

1395

servers, but don't block */

1396

}

1397

1398

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

1399

}

1400

if(ret != 0){

1401

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

1402

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

1403

}

1404

}

1405

}

1406

}

1407

979

1408

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

980

1409

AvahiSServiceBrowser *sb = NULL;

981

1410

int error;

983

1412

intmax_t tmpmax;

984

1413

char *tmp;

985

1414

int exitcode = EXIT_SUCCESS;

986

const char *interface = "eth0";

1415

const char *interface = "";

987

1416

struct ifreq network;

988

1417

int sd = -1;

989

1418

bool take_down_interface = false;

990

1419

uid_t uid;

991

1420

gid_t gid;

992

char *connect_to = NULL;

993

1421

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

994

1422

bool tempdir_created = false;

995

1423

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

999

1427

bool gnutls_initialized = false;

1000

1428

bool gpgme_initialized = false;

1001

1429

float delay = 2.5f;

1430

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

1431

retrying the same server again */

1002

1432

1003

1433

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1004

1434

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1010

1440

errno = 0;

1011

1441

ret = setgid(gid);

1012

1442

if(ret == -1){

1013

perror("setgid");

1443

perror_plus("setgid");

1014

1444

}

1015

1445

1016

1446

/* Lower user privileges (temporarily) */

1017

1447

errno = 0;

1018

1448

ret = seteuid(uid);

1019

1449

if(ret == -1){

1020

perror("seteuid");

1450

perror_plus("seteuid");

1021

1451

}

1022

1452

1023

1453

if(quit_now){

1058

1488

.arg = "SECONDS",

1059

1489

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

1060

1490

.group = 2 },

1491

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

1492

.arg = "SECONDS",

1493

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

1494

.group = 2 },

1495

/*

1496

* These reproduce what we would get without ARGP_NO_HELP

1497

*/

1498

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

1499

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

1500

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

1501

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

1502

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

1503

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

1061

1504

{ .name = NULL }

1062

1505

};

1063

1506

1064

1507

error_t parse_opt(int key, char *arg,

1065

1508

struct argp_state *state){

1509

errno = 0;

1066

1510

switch(key){

1067

1511

case 128: /* --debug */

1068

1512

debug = true;

1084

1528

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

1085

1529

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

1086

1530

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

1087

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

1088

exit(EXIT_FAILURE);

1531

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

1089

1532

}

1090

1533

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

1091

1534

break;

1096

1539

errno = 0;

1097

1540

delay = strtof(arg, &tmp);

1098

1541

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

1099

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

1100

exit(EXIT_FAILURE);

1542

argp_error(state, "Bad delay");

1543

}

1544

case 132: /* --retry */

1545

errno = 0;

1546

retry_interval = strtod(arg, &tmp);

1547

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

1548

or (retry_interval * 1000) > INT_MAX

1549

or retry_interval < 0){

1550

argp_error(state, "Bad retry interval");

1101

1551

}

1102

1552

break;

1103

case ARGP_KEY_ARG:

1104

argp_usage(state);

1105

case ARGP_KEY_END:

1553

/*

1554

* These reproduce what we would get without ARGP_NO_HELP

1555

*/

1556

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

1557

argp_state_help(state, state->out_stream,

1558

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1559

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1560

case -3: /* --usage */

1561

argp_state_help(state, state->out_stream,

1562

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1563

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

1564

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

1565

exit(argp_err_exit_status);

1106

1566

break;

1107

1567

default:

1108

1568

return ARGP_ERR_UNKNOWN;

1109

1569

}

1110

return 0;

1570

return errno;

1111

1571

}

1112

1572

1113

1573

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

1114

1574

.args_doc = "",

1115

1575

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

1116

1576

" passwords from a Mandos server" };

1117

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

1118

if(ret == ARGP_ERR_UNKNOWN){

1119

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

1120

exitcode = EXIT_FAILURE;

1121

goto end;

1122

}

1577

ret = argp_parse(&argp, argc, argv,

1578

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1579

switch(ret){

1580

case 0:

1581

break;

1582

case ENOMEM:

1583

default:

1584

errno = ret;

1585

perror_plus("argp_parse");

1586

exitcode = EX_OSERR;

1587

goto end;

1588

case EINVAL:

1589

exitcode = EX_USAGE;

1590

goto end;

1591

}

1592

}

1593

1594

{

1595

/* Work around Debian bug #633582:

1596

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

1597

struct stat st;

1598

1599

/* Re-raise priviliges */

1600

errno = 0;

1601

ret = seteuid(0);

1602

if(ret == -1){

1603

perror_plus("seteuid");

1604

}

1605

1606

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

1607

int seckey_fd = open(seckey, O_RDONLY);

1608

if(seckey_fd == -1){

1609

perror_plus("open");

1610

} else {

1611

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

1612

if(ret == -1){

1613

perror_plus("fstat");

1614

} else {

1615

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

1616

ret = fchown(seckey_fd, uid, gid);

1617

if(ret == -1){

1618

perror_plus("fchown");

1619

}

1620

}

1621

}

1622

TEMP_FAILURE_RETRY(close(seckey_fd));

1623

}

1624

}

1625

1626

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

1627

int pubkey_fd = open(pubkey, O_RDONLY);

1628

if(pubkey_fd == -1){

1629

perror_plus("open");

1630

} else {

1631

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

1632

if(ret == -1){

1633

perror_plus("fstat");

1634

} else {

1635

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

1636

ret = fchown(pubkey_fd, uid, gid);

1637

if(ret == -1){

1638

perror_plus("fchown");

1639

}

1640

}

1641

}

1642

TEMP_FAILURE_RETRY(close(pubkey_fd));

1643

}

1644

}

1645

1646

/* Lower privileges */

1647

errno = 0;

1648

ret = seteuid(uid);

1649

if(ret == -1){

1650

perror_plus("seteuid");

1651

}

1652

}

1653

1654

/* Find network hooks and run them */

1655

{

1656

struct dirent **direntries;

1657

struct dirent *direntry;

1658

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

1659

alphasort);

1660

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

1661

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

1662

direntry = direntries[0];

1663

char *fullname = NULL;

1664

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

1665

direntry->d_name);

1666

if(ret < 0){

1667

perror_plus("asprintf");

1668

continue;

1669

}

1670

pid_t hook_pid = fork();

1671

if(hook_pid == 0){

1672

/* Child */

1673

dup2(devnull, STDIN_FILENO);

1674

close(devnull);

1675

dup2(STDERR_FILENO, STDOUT_FILENO);

1676

setenv("DEVICE", interface, 1);

1677

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

1678

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

1679

/* setenv( XXX more here */

1680

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

1681

perror_plus("execl");

1682

}

1683

free(fullname);

1684

if(quit_now){

1685

goto end;

1686

}

1687

}

1688

close(devnull);

1123

1689

}

1124

1690

1125

1691

if(not debug){

1126

1692

avahi_set_log_function(empty_log);

1127

1693

}

1128

1694

1695

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

1696

struct dirent **direntries;

1697

ret = scandir(sys_class_net, &direntries, good_interface,

1698

alphasort);

1699

if(ret >= 1){

1700

/* Pick the first good interface */

1701

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

1702

if(debug){

1703

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

1704

}

1705

if(interface == NULL){

1706

perror_plus("malloc");

1707

free(direntries);

1708

exitcode = EXIT_FAILURE;

1709

goto end;

1710

}

1711

free(direntries);

1712

} else {

1713

free(direntries);

1714

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

1715

exitcode = EXIT_FAILURE;

1716

goto end;

1717

}

1718

}

1719

1129

1720

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

1130

1721

from the signal handler */

1131

1722

/* Initialize the pseudo-RNG for Avahi */

1133

1724

mc.simple_poll = avahi_simple_poll_new();

1134

1725

if(mc.simple_poll == NULL){

1135

1726

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

1136

exitcode = EXIT_FAILURE;

1727

exitcode = EX_UNAVAILABLE;

1137

1728

goto end;

1138

1729

}

1139

1730

1140

1731

sigemptyset(&sigterm_action.sa_mask);

1141

1732

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

1142

1733

if(ret == -1){

1143

perror("sigaddset");

1144

exitcode = EXIT_FAILURE;

1734

perror_plus("sigaddset");

1735

exitcode = EX_OSERR;

1145

1736

goto end;

1146

1737

}

1147

1738

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

1148

1739

if(ret == -1){

1149

perror("sigaddset");

1150

exitcode = EXIT_FAILURE;

1740

perror_plus("sigaddset");

1741

exitcode = EX_OSERR;

1151

1742

goto end;

1152

1743

}

1153

1744

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

1154

1745

if(ret == -1){

1155

perror("sigaddset");

1156

exitcode = EXIT_FAILURE;

1746

perror_plus("sigaddset");

1747

exitcode = EX_OSERR;

1157

1748

goto end;

1158

1749

}

1159

1750

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

1162

1753

*/

1163

1754

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

1164

1755

if(ret == -1){

1165

perror("sigaction");

1166

return EXIT_FAILURE;

1756

perror_plus("sigaction");

1757

return EX_OSERR;

1167

1758

}

1168

1759

if(old_sigterm_action.sa_handler != SIG_IGN){

1169

1760

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

1170

1761

if(ret == -1){

1171

perror("sigaction");

1172

exitcode = EXIT_FAILURE;

1762

perror_plus("sigaction");

1763

exitcode = EX_OSERR;

1173

1764

goto end;

1174

1765

}

1175

1766

}

1176

1767

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

1177

1768

if(ret == -1){

1178

perror("sigaction");

1179

return EXIT_FAILURE;

1769

perror_plus("sigaction");

1770

return EX_OSERR;

1180

1771

}

1181

1772

if(old_sigterm_action.sa_handler != SIG_IGN){

1182

1773

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

1183

1774

if(ret == -1){

1184

perror("sigaction");

1185

exitcode = EXIT_FAILURE;

1775

perror_plus("sigaction");

1776

exitcode = EX_OSERR;

1186

1777

goto end;

1187

1778

}

1188

1779

}

1189

1780

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

1190

1781

if(ret == -1){

1191

perror("sigaction");

1192

return EXIT_FAILURE;

1782

perror_plus("sigaction");

1783

return EX_OSERR;

1193

1784

}

1194

1785

if(old_sigterm_action.sa_handler != SIG_IGN){

1195

1786

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

1196

1787

if(ret == -1){

1197

perror("sigaction");

1198

exitcode = EXIT_FAILURE;

1788

perror_plus("sigaction");

1789

exitcode = EX_OSERR;

1199

1790

goto end;

1200

1791

}

1201

1792

}

1202

1793

1203

1794

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

1204

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

1795

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

1205

1796

if_index = (AvahiIfIndex) if_nametoindex(interface);

1206

1797

if(if_index == 0){

1207

1798

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

1208

exitcode = EXIT_FAILURE;

1799

exitcode = EX_UNAVAILABLE;

1209

1800

goto end;

1210

1801

}

1211

1802

1217

1808

errno = 0;

1218

1809

ret = seteuid(0);

1219

1810

if(ret == -1){

1220

perror("seteuid");

1811

perror_plus("seteuid");

1221

1812

}

1222

1813

1223

1814

#ifdef __linux__

1224

1815

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1225

messages to mess up the prompt */

1816

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

1226

1817

ret = klogctl(8, NULL, 5);

1227

1818

bool restore_loglevel = true;

1228

1819

if(ret == -1){

1229

1820

restore_loglevel = false;

1230

perror("klogctl");

1821

perror_plus("klogctl");

1231

1822

}

1232

1823

#endif /* __linux__ */

1233

1824

1234

1825

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1235

1826

if(sd < 0){

1236

perror("socket");

1237

exitcode = EXIT_FAILURE;

1827

perror_plus("socket");

1828

exitcode = EX_OSERR;

1238

1829

#ifdef __linux__

1239

1830

if(restore_loglevel){

1240

1831

ret = klogctl(7, NULL, 0);

1241

1832

if(ret == -1){

1242

perror("klogctl");

1833

perror_plus("klogctl");

1243

1834

}

1244

1835

}

1245

1836

#endif /* __linux__ */

1247

1838

errno = 0;

1248

1839

ret = seteuid(uid);

1249

1840

if(ret == -1){

1250

perror("seteuid");

1841

perror_plus("seteuid");

1251

1842

}

1252

1843

goto end;

1253

1844

}

1254

1845

strcpy(network.ifr_name, interface);

1255

1846

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

1256

1847

if(ret == -1){

1257

perror("ioctl SIOCGIFFLAGS");

1848

perror_plus("ioctl SIOCGIFFLAGS");

1258

1849

#ifdef __linux__

1259

1850

if(restore_loglevel){

1260

1851

ret = klogctl(7, NULL, 0);

1261

1852

if(ret == -1){

1262

perror("klogctl");

1853

perror_plus("klogctl");

1263

1854

}

1264

1855

}

1265

1856

#endif /* __linux__ */

1266

exitcode = EXIT_FAILURE;

1857

exitcode = EX_OSERR;

1267

1858

/* Lower privileges */

1268

1859

errno = 0;

1269

1860

ret = seteuid(uid);

1270

1861

if(ret == -1){

1271

perror("seteuid");

1862

perror_plus("seteuid");

1272

1863

}

1273

1864

goto end;

1274

1865

}

1278

1869

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

1279

1870

if(ret == -1){

1280

1871

take_down_interface = false;

1281

perror("ioctl SIOCSIFFLAGS");

1282

exitcode = EXIT_FAILURE;

1872

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1873

exitcode = EX_OSERR;

1283

1874

#ifdef __linux__

1284

1875

if(restore_loglevel){

1285

1876

ret = klogctl(7, NULL, 0);

1286

1877

if(ret == -1){

1287

perror("klogctl");

1878

perror_plus("klogctl");

1288

1879

}

1289

1880

}

1290

1881

#endif /* __linux__ */

1292

1883

errno = 0;

1293

1884

ret = seteuid(uid);

1294

1885

if(ret == -1){

1295

perror("seteuid");

1886

perror_plus("seteuid");

1296

1887

}

1297

1888

goto end;

1298

1889

}

1299

1890

}

1300

/* sleep checking until interface is running */

1891

/* Sleep checking until interface is running.

1892

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

1301

1893

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

1302

1894

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

1303

1895

if(ret == -1){

1304

perror("ioctl SIOCGIFFLAGS");

1896

perror_plus("ioctl SIOCGIFFLAGS");

1305

1897

} else if(network.ifr_flags & IFF_RUNNING){

1306

1898

break;

1307

1899

}

1308

1900

struct timespec sleeptime = { .tv_nsec = 250000000 };

1309

1901

ret = nanosleep(&sleeptime, NULL);

1310

1902

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

1311

perror("nanosleep");

1903

perror_plus("nanosleep");

1312

1904

}

1313

1905

}

1314

1906

if(not take_down_interface){

1315

1907

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

1316

1908

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

1317

1909

if(ret == -1){

1318

perror("close");

1910

perror_plus("close");

1319

1911

}

1320

1912

}

1321

1913

#ifdef __linux__

1323

1915

/* Restores kernel loglevel to default */

1324

1916

ret = klogctl(7, NULL, 0);

1325

1917

if(ret == -1){

1326

perror("klogctl");

1918

perror_plus("klogctl");

1327

1919

}

1328

1920

}

1329

1921

#endif /* __linux__ */

1333

1925

/* Lower privileges */

1334

1926

ret = seteuid(uid);

1335

1927

if(ret == -1){

1336

perror("seteuid");

1928

perror_plus("seteuid");

1337

1929

}

1338

1930

} else {

1339

1931

/* Lower privileges permanently */

1340

1932

ret = setuid(uid);

1341

1933

if(ret == -1){

1342

perror("setuid");

1934

perror_plus("setuid");

1343

1935

}

1344

1936

}

1345

1937

}

1351

1943

ret = init_gnutls_global(pubkey, seckey);

1352

1944

if(ret == -1){

1353

1945

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

1354

exitcode = EXIT_FAILURE;

1946

exitcode = EX_UNAVAILABLE;

1355

1947

goto end;

1356

1948

} else {

1357

1949

gnutls_initialized = true;

1361

1953

goto end;

1362

1954

}

1363

1955

1956

if(mkdtemp(tempdir) == NULL){

1957

perror_plus("mkdtemp");

1958

goto end;

1959

}

1364

1960

tempdir_created = true;

1365

if(mkdtemp(tempdir) == NULL){

1366

tempdir_created = false;

1367

perror("mkdtemp");

1368

goto end;

1369

}

1370

1961

1371

1962

if(quit_now){

1372

1963

goto end;

1374

1965

1375

1966

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

1376

1967

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

1377

exitcode = EXIT_FAILURE;

1968

exitcode = EX_UNAVAILABLE;

1378

1969

goto end;

1379

1970

} else {

1380

1971

gpgme_initialized = true;

1390

1981

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

1391

1982

if(address == NULL){

1392

1983

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

1393

exitcode = EXIT_FAILURE;

1984

exitcode = EX_USAGE;

1394

1985

goto end;

1395

1986

}

1396

1987

1404

1995

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

1405

1996

or tmpmax != (uint16_t)tmpmax){

1406

1997

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

1407

exitcode = EXIT_FAILURE;

1998

exitcode = EX_USAGE;

1408

1999

goto end;

1409

2000

}

1410

2001

1414

2005

1415

2006

port = (uint16_t)tmpmax;

1416

2007

*address = '\0';

1417

address = connect_to;

1418

2008

/* Colon in address indicates IPv6 */

1419

2009

int af;

1420

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

2010

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

1421

2011

af = AF_INET6;

2012

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

2013

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

2014

{

2015

connect_to++;

2016

address[-1] = '\0';

2017

}

1422

2018

} else {

1423

2019

af = AF_INET;

1424

2020

}

2021

address = connect_to;

1425

2022

1426

2023

if(quit_now){

1427

2024

goto end;

1428

2025

}

1429

2026

1430

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

1431

if(ret < 0){

1432

exitcode = EXIT_FAILURE;

1433

} else {

2027

while(not quit_now){

2028

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

2029

if(quit_now or ret == 0){

2030

break;

2031

}

2032

if(debug){

2033

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

2034

(int)retry_interval);

2035

}

2036

sleep((int)retry_interval);

2037

}

2038

2039

if (not quit_now){

1434

2040

exitcode = EXIT_SUCCESS;

1435

2041

}

2042

1436

2043

goto end;

1437

2044

}

1438

2045

1462

2069

if(mc.server == NULL){

1463

2070

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

1464

2071

avahi_strerror(error));

1465

exitcode = EXIT_FAILURE;

2072

exitcode = EX_UNAVAILABLE;

1466

2073

goto end;

1467

2074

}

1468

2075

1477

2084

if(sb == NULL){

1478

2085

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

1479

2086

avahi_strerror(avahi_server_errno(mc.server)));

1480

exitcode = EXIT_FAILURE;

2087

exitcode = EX_UNAVAILABLE;

1481

2088

goto end;

1482

2089

}

1483

2090

1490

2097

if(debug){

1491

2098

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

1492

2099

}

1493

1494

avahi_simple_poll_loop(mc.simple_poll);

2100

2101

ret = avahi_loop_with_timeout(mc.simple_poll,

2102

(int)(retry_interval * 1000));

2103

if(debug){

2104

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

2105

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

2106

}

1495

2107

1496

2108

end:

1497

2109

1518

2130

if(gpgme_initialized){

1519

2131

gpgme_release(mc.ctx);

1520

2132

}

2133

2134

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

2135

has seen */

2136

if(mc.current_server != NULL){

2137

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

2138

while(mc.current_server != NULL){

2139

server *next = mc.current_server->next;

2140

free(mc.current_server);

2141

mc.current_server = next;

2142

}

2143

}

2144

2145

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

1521

2146

1522

2147

/* Take down the network interface */

1523

2148

if(take_down_interface){

1525

2150

errno = 0;

1526

2151

ret = seteuid(0);

1527

2152

if(ret == -1){

1528

perror("seteuid");

2153

perror_plus("seteuid");

1529

2154

}

1530

2155

if(geteuid() == 0){

1531

2156

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

1532

2157

if(ret == -1){

1533

perror("ioctl SIOCGIFFLAGS");

2158

perror_plus("ioctl SIOCGIFFLAGS");

1534

2159

} else if(network.ifr_flags & IFF_UP) {

1535

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

2160

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

1536

2161

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

1537

2162

if(ret == -1){

1538

perror("ioctl SIOCSIFFLAGS");

2163

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1539

2164

}

1540

2165

}

1541

2166

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

1542

2167

if(ret == -1){

1543

perror("close");

2168

perror_plus("close");

1544

2169

}

1545

2170

/* Lower privileges permanently */

1546

2171

errno = 0;

1547

2172

ret = setuid(uid);

1548

2173

if(ret == -1){

1549

perror("setuid");

2174

perror_plus("setuid");

1550

2175

}

1551

2176

}

1552

2177

}

1553

2178

1554

/* Removes the temp directory used by GPGME */

2179

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

1555

2180

if(tempdir_created){

1556

DIR *d;

1557

struct dirent *direntry;

1558

d = opendir(tempdir);

1559

if(d == NULL){

1560

if(errno != ENOENT){

1561

perror("opendir");

1562

}

1563

} else {

1564

while(true){

1565

direntry = readdir(d);

1566

if(direntry == NULL){

1567

break;

1568

}

1569

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

1570

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

1571

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

1572

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

1573

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

1574

continue;

1575

}

2181

struct dirent **direntries = NULL;

2182

struct dirent *direntry = NULL;

2183

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

2184

alphasort);

2185

if (numentries > 0){

2186

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

2187

direntry = direntries[i];

1576

2188

char *fullname = NULL;

1577

2189

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

1578

2190

direntry->d_name);

1579

2191

if(ret < 0){

1580

perror("asprintf");

2192

perror_plus("asprintf");

1581

2193

continue;

1582

2194

}

1583

2195

ret = remove(fullname);

1587

2199

}

1588

2200

free(fullname);

1589

2201

}

1590

closedir(d);

2202

}

2203

2204

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

2205

free(direntries);

2206

if (numentries == -1){

2207

perror_plus("scandir");

1591

2208

}

1592

2209

ret = rmdir(tempdir);

1593

2210

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

1594

perror("rmdir");

2211

perror_plus("rmdir");

1595

2212

}

1596

2213

}

1597

2214

1598

2215

if(quit_now){

1599

2216

sigemptyset(&old_sigterm_action.sa_mask);

1600

2217

old_sigterm_action.sa_handler = SIG_DFL;

1601

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

2218

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

2219

&old_sigterm_action,

2220

NULL));

1602

2221

if(ret == -1){

1603

perror("sigaction");

1604

}

1605

raise(signal_received);

2222

perror_plus("sigaction");

2223

}

2224

do {

2225

ret = raise(signal_received);

2226

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

2227

if(ret != 0){

2228

perror_plus("raise");

2229

abort();

2230

}

2231

TEMP_FAILURE_RETRY(pause());

1606

2232

}

1607

2233

1608

2234

return exitcode;