/mandos/trunk : revision 547

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

41

42

#include <stdio.h> /* fprintf(), stderr, fwrite(),

43

stdout, ferror(), remove() */

44

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

44

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

45

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

46

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

47

strtof(), abort() */

55

opendir(), DIR */

56

#include <sys/stat.h> /* open(), S_ISREG */

57

#include <sys/socket.h> /* socket(), struct sockaddr_in6,

58

inet_pton(), connect(),

59

getnameinfo() */

58

inet_pton(), connect() */

60

59

#include <fcntl.h> /* open() */

61

60

#include <dirent.h> /* opendir(), struct dirent, readdir()

62

61

*/

63

62

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

64

63

strtoimax() */

64

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

65

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

66

program_invocation_short_name */

67

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

74

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

75

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

76

setgid(), pause(), _exit() */

77

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

77

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

78

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

79

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

80

argp_state, struct argp,

88

#include <sys/wait.h> /* waitpid(), WIFEXITED(),

89

WEXITSTATUS(), WTERMSIG() */

90

#include <grp.h> /* setgroups() */

91

#include <argz.h> /* argz_add_sep(), argz_next(),

92

argz_delete(), argz_append(),

93

argz_stringify(), argz_add(),

94

argz_count() */

95

#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,

96

EAI_SYSTEM, gai_strerror() */

97

91

98

92

#ifdef __linux__

99

93

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

141

135

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

142

136

char *connect_to = NULL;

143

137

const char *hookdir = HOOKDIR;

144

uid_t uid = 65534;

145

gid_t gid = 65534;

146

138

147

139

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

148

140

typedef struct server{

149

141

const char *ip;

150

in_port_t port;

142

uint16_t port;

151

143

AvahiIfIndex if_index;

152

144

int af;

153

145

struct timespec last_seen;

157

149

158

150

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

159

151

typedef struct {

152

AvahiSimplePoll *simple_poll;

160

153

AvahiServer *server;

161

154

gnutls_certificate_credentials_t cred;

162

155

unsigned int dh_bits;

164

157

const char *priority;

165

158

gpgme_ctx_t ctx;

166

159

server *current_server;

167

char *interfaces;

168

size_t interfaces_size;

169

160

} mandos_context;

170

161

171

/* global so signal handler can reach it*/

172

AvahiSimplePoll *simple_poll;

162

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

163

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

164

.dh_bits = 1024, .priority = "SECURE256"

165

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

166

.current_server = NULL };

173

167

174

168

sig_atomic_t quit_now = 0;

175

169

int signal_received = 0;

190

184

191

185

TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",

192

186

program_invocation_short_name));

193

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

187

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

194

188

}

195

189

196

190

/*

201

195

size_t incbuffer(char **buffer, size_t buffer_length,

202

196

size_t buffer_capacity){

203

197

if(buffer_length + BUFFER_SIZE > buffer_capacity){

204

char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);

205

if(new_buf == NULL){

206

int old_errno = errno;

207

free(*buffer);

208

errno = old_errno;

209

*buffer = NULL;

198

*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);

199

if(buffer == NULL){

210

200

return 0;

211

201

}

212

*buffer = new_buf;

213

202

buffer_capacity += BUFFER_SIZE;

214

203

}

215

204

return buffer_capacity;

216

205

}

217

206

218

207

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

219

bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,

220

int af, server **current_server){

208

bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,

209

int af){

221

210

int ret;

222

211

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

223

212

if(new_server == NULL){

232

221

perror_plus("strdup");

233

222

return false;

234

223

}

235

ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));

236

if(ret == -1){

237

perror_plus("clock_gettime");

238

return false;

239

}

240

224

/* Special case of first server */

241

if(*current_server == NULL){

225

if (mc.current_server == NULL){

242

226

new_server->next = new_server;

243

227

new_server->prev = new_server;

244

*current_server = new_server;

228

mc.current_server = new_server;

245

229

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

246

230

} else {

247

new_server->next = *current_server;

248

new_server->prev = (*current_server)->prev;

231

new_server->next = mc.current_server;

232

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

249

233

new_server->prev->next = new_server;

250

(*current_server)->prev = new_server;

234

mc.current_server->prev = new_server;

235

}

236

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

237

if(ret == -1){

238

perror_plus("clock_gettime");

239

return false;

251

240

}

252

241

return true;

253

242

}

256

245

* Initialize GPGME.

257

246

*/

258

247

static bool init_gpgme(const char *seckey, const char *pubkey,

259

const char *tempdir, mandos_context *mc){

248

const char *tempdir){

260

249

gpgme_error_t rc;

261

250

gpgme_engine_info_t engine_info;

262

251

252

263

253

/*

264

254

* Helper function to insert pub and seckey to the engine keyring.

265

255

*/

281

271

return false;

282

272

}

283

273

284

rc = gpgme_op_import(mc->ctx, pgp_data);

274

rc = gpgme_op_import(mc.ctx, pgp_data);

285

275

if(rc != GPG_ERR_NO_ERROR){

286

276

fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",

287

277

gpgme_strsource(rc), gpgme_strerror(rc));

331

321

}

332

322

333

323

/* Create new GPGME "context" */

334

rc = gpgme_new(&(mc->ctx));

324

rc = gpgme_new(&(mc.ctx));

335

325

if(rc != GPG_ERR_NO_ERROR){

336

326

fprintf_plus(stderr, "Mandos plugin mandos-client: "

337

327

"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),

352

342

*/

353

343

static ssize_t pgp_packet_decrypt(const char *cryptotext,

354

344

size_t crypto_size,

355

char **plaintext,

356

mandos_context *mc){

345

char **plaintext){

357

346

gpgme_data_t dh_crypto, dh_plain;

358

347

gpgme_error_t rc;

359

348

ssize_t ret;

385

374

386

375

/* Decrypt data from the cryptotext data buffer to the plaintext

387

376

data buffer */

388

rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);

377

rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);

389

378

if(rc != GPG_ERR_NO_ERROR){

390

379

fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",

391

380

gpgme_strsource(rc), gpgme_strerror(rc));

392

381

plaintext_length = -1;

393

382

if(debug){

394

383

gpgme_decrypt_result_t result;

395

result = gpgme_op_decrypt_result(mc->ctx);

384

result = gpgme_op_decrypt_result(mc.ctx);

396

385

if(result == NULL){

397

386

fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");

398

387

} else {

476

465

}

477

466

478

467

static const char * safer_gnutls_strerror(int value){

479

const char *ret = gnutls_strerror(value);

468

const char *ret = gnutls_strerror(value); /* Spurious warning from

469

-Wunreachable-code */

480

470

if(ret == NULL)

481

471

ret = "(unknown)";

482

472

return ret;

489

479

}

490

480

491

481

static int init_gnutls_global(const char *pubkeyfilename,

492

const char *seckeyfilename,

493

mandos_context *mc){

482

const char *seckeyfilename){

494

483

int ret;

495

484

496

485

if(debug){

513

502

}

514

503

515

504

/* OpenPGP credentials */

516

ret = gnutls_certificate_allocate_credentials(&mc->cred);

505

ret = gnutls_certificate_allocate_credentials(&mc.cred);

517

506

if(ret != GNUTLS_E_SUCCESS){

518

507

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

519

508

safer_gnutls_strerror(ret));

529

518

}

530

519

531

520

ret = gnutls_certificate_set_openpgp_key_file

532

(mc->cred, pubkeyfilename, seckeyfilename,

521

(mc.cred, pubkeyfilename, seckeyfilename,

533

522

GNUTLS_OPENPGP_FMT_BASE64);

534

523

if(ret != GNUTLS_E_SUCCESS){

535

524

fprintf_plus(stderr,

541

530

}

542

531

543

532

/* GnuTLS server initialization */

544

ret = gnutls_dh_params_init(&mc->dh_params);

533

ret = gnutls_dh_params_init(&mc.dh_params);

545

534

if(ret != GNUTLS_E_SUCCESS){

546

535

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

547

536

" initialization: %s\n",

548

537

safer_gnutls_strerror(ret));

549

538

goto globalfail;

550

539

}

551

ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);

540

ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);

552

541

if(ret != GNUTLS_E_SUCCESS){

553

542

fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",

554

543

safer_gnutls_strerror(ret));

555

544

goto globalfail;

556

545

}

557

546

558

gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);

547

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

559

548

560

549

return 0;

561

550

562

551

globalfail:

563

552

564

gnutls_certificate_free_credentials(mc->cred);

553

gnutls_certificate_free_credentials(mc.cred);

565

554

gnutls_global_deinit();

566

gnutls_dh_params_deinit(mc->dh_params);

555

gnutls_dh_params_deinit(mc.dh_params);

567

556

return -1;

568

557

}

569

558

570

static int init_gnutls_session(gnutls_session_t *session,

571

mandos_context *mc){

559

static int init_gnutls_session(gnutls_session_t *session){

572

560

int ret;

573

561

/* GnuTLS session creation */

574

562

do {

586

574

{

587

575

const char *err;

588

576

do {

589

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

577

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

590

578

if(quit_now){

591

579

gnutls_deinit(*session);

592

580

return -1;

603

591

604

592

do {

605

593

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

606

mc->cred);

594

mc.cred);

607

595

if(quit_now){

608

596

gnutls_deinit(*session);

609

597

return -1;

619

607

/* ignore client certificate if any. */

620

608

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

621

609

622

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

610

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

623

611

624

612

return 0;

625

613

}

629

617

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

630

618

631

619

/* Called when a Mandos server is found */

632

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

620

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

633

621

AvahiIfIndex if_index,

634

int af, mandos_context *mc){

622

int af){

635

623

int ret, tcp_sd = -1;

636

624

ssize_t sret;

637

struct sockaddr_storage to;

625

union {

626

struct sockaddr_in in;

627

struct sockaddr_in6 in6;

628

} to;

638

629

char *buffer = NULL;

639

630

char *decrypted_buffer = NULL;

640

631

size_t buffer_length = 0;

664

655

return -1;

665

656

}

666

657

667

/* If the interface is specified and we have a list of interfaces */

668

if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){

669

/* Check if the interface is one of the interfaces we are using */

670

bool match = false;

671

{

672

char *interface = NULL;

673

while((interface=argz_next(mc->interfaces, mc->interfaces_size,

674

interface))){

675

if(if_nametoindex(interface) == (unsigned int)if_index){

676

match = true;

677

break;

678

}

679

}

680

}

681

if(not match){

682

/* This interface does not match any in the list, so we don't

683

connect to the server */

684

if(debug){

685

char interface[IF_NAMESIZE];

686

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

687

perror_plus("if_indextoname");

688

} else {

689

fprintf_plus(stderr, "Skipping server on non-used interface"

690

" \"%s\"\n",

691

if_indextoname((unsigned int)if_index,

692

interface));

693

}

694

}

695

return -1;

696

}

697

}

698

699

ret = init_gnutls_session(&session, mc);

658

ret = init_gnutls_session(&session);

700

659

if(ret != 0){

701

660

return -1;

702

661

}

703

662

704

663

if(debug){

705

664

fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"

706

PRIuMAX "\n", ip, (uintmax_t)port);

665

PRIu16 "\n", ip, port);

707

666

}

708

667

709

668

tcp_sd = socket(pf, SOCK_STREAM, 0);

721

680

722

681

memset(&to, 0, sizeof(to));

723

682

if(af == AF_INET6){

724

((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;

725

ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);

683

to.in6.sin6_family = (sa_family_t)af;

684

ret = inet_pton(af, ip, &to.in6.sin6_addr);

726

685

} else { /* IPv4 */

727

((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;

728

ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);

686

to.in.sin_family = (sa_family_t)af;

687

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

729

688

}

730

689

if(ret < 0 ){

731

690

int e = errno;

740

699

goto mandos_end;

741

700

}

742

701

if(af == AF_INET6){

743

((struct sockaddr_in6 *)&to)->sin6_port = htons(port);

744

if(IN6_IS_ADDR_LINKLOCAL

745

(&((struct sockaddr_in6 *)&to)->sin6_addr)){

702

to.in6.sin6_port = htons(port); /* Spurious warnings from

703

-Wconversion and

704

-Wunreachable-code */

705

706

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

707

(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and

708

-Wunreachable-code*/

746

709

if(if_index == AVAHI_IF_UNSPEC){

747

710

fprintf_plus(stderr, "An IPv6 link-local address is"

748

711

" incomplete without a network interface\n");

750

713

goto mandos_end;

751

714

}

752

715

/* Set the network interface number as scope */

753

((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;

716

to.in6.sin6_scope_id = (uint32_t)if_index;

754

717

}

755

718

} else {

756

((struct sockaddr_in *)&to)->sin_port = htons(port);

719

to.in.sin_port = htons(port); /* Spurious warnings from

720

-Wconversion and

721

-Wunreachable-code */

757

722

}

758

723

759

724

if(quit_now){

767

732

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

768

733

perror_plus("if_indextoname");

769

734

} else {

770

fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX

771

"\n", ip, interface, (uintmax_t)port);

735

fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16

736

"\n", ip, interface, port);

772

737

}

773

738

} else {

774

fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",

775

ip, (uintmax_t)port);

739

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

740

ip, port);

776

741

}

777

742

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

778

743

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

744

const char *pcret;

779

745

if(af == AF_INET6){

780

ret = getnameinfo((struct sockaddr *)&to,

781

sizeof(struct sockaddr_in6),

782

addrstr, sizeof(addrstr), NULL, 0,

783

NI_NUMERICHOST);

746

pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,

747

sizeof(addrstr));

784

748

} else {

785

ret = getnameinfo((struct sockaddr *)&to,

786

sizeof(struct sockaddr_in),

787

addrstr, sizeof(addrstr), NULL, 0,

788

NI_NUMERICHOST);

749

pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,

750

sizeof(addrstr));

789

751

}

790

if(ret == EAI_SYSTEM){

791

perror_plus("getnameinfo");

792

} else if(ret != 0) {

793

fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));

794

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

795

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

752

if(pcret == NULL){

753

perror_plus("inet_ntop");

754

} else {

755

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

756

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

757

}

796

758

}

797

759

}

798

760

802

764

}

803

765

804

766

if(af == AF_INET6){

805

ret = connect(tcp_sd, (struct sockaddr *)&to,

806

sizeof(struct sockaddr_in6));

767

ret = connect(tcp_sd, &to.in6, sizeof(to));

807

768

} else {

808

ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */

809

sizeof(struct sockaddr_in));

769

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

810

770

}

811

771

if(ret < 0){

812

772

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

861

821

goto mandos_end;

862

822

}

863

823

864

/* This casting via intptr_t is to eliminate warning about casting

865

an int to a pointer type. This is exactly how the GnuTLS Guile

866

function "set-session-transport-fd!" does it. */

867

gnutls_transport_set_ptr(session,

868

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

824

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

825

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

869

826

870

827

if(quit_now){

871

828

errno = EINTR;

976

933

if(buffer_length > 0){

977

934

ssize_t decrypted_buffer_size;

978

935

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

979

&decrypted_buffer, mc);

936

&decrypted_buffer);

980

937

if(decrypted_buffer_size >= 0){

981

938

982

939

written = 0;

1043

1000

AVAHI_GCC_UNUSED AvahiStringList *txt,

1044

1001

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1045

1002

flags,

1046

void* mc){

1047

if(r == NULL){

1048

return;

1049

}

1003

AVAHI_GCC_UNUSED void* userdata){

1004

assert(r);

1050

1005

1051

1006

/* Called whenever a service has been resolved successfully or

1052

1007

timed out */

1061

1016

fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "

1062

1017

"'%s' of type '%s' in domain '%s': %s\n", name, type,

1063

1018

domain,

1064

avahi_strerror(avahi_server_errno

1065

(((mandos_context*)mc)->server)));

1019

avahi_strerror(avahi_server_errno(mc.server)));

1066

1020

break;

1067

1021

1068

1022

case AVAHI_RESOLVER_FOUND:

1074

1028

PRIdMAX ") on port %" PRIu16 "\n", name,

1075

1029

host_name, ip, (intmax_t)interface, port);

1076

1030

}

1077

int ret = start_mandos_communication(ip, (in_port_t)port,

1078

interface,

1079

avahi_proto_to_af(proto),

1080

mc);

1031

int ret = start_mandos_communication(ip, port, interface,

1032

avahi_proto_to_af(proto));

1081

1033

if(ret == 0){

1082

avahi_simple_poll_quit(simple_poll);

1034

avahi_simple_poll_quit(mc.simple_poll);

1083

1035

} else {

1084

if(not add_server(ip, (in_port_t)port, interface,

1085

avahi_proto_to_af(proto),

1086

&((mandos_context*)mc)->current_server)){

1036

if(not add_server(ip, port, interface,

1037

avahi_proto_to_af(proto))){

1087

1038

fprintf_plus(stderr, "Failed to add server \"%s\" to server"

1088

1039

" list\n", name);

1089

1040

}

1102

1053

const char *domain,

1103

1054

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1104

1055

flags,

1105

void* mc){

1106

if(b == NULL){

1107

return;

1108

}

1056

AVAHI_GCC_UNUSED void* userdata){

1057

assert(b);

1109

1058

1110

1059

/* Called whenever a new services becomes available on the LAN or

1111

1060

is removed from the LAN */

1119

1068

case AVAHI_BROWSER_FAILURE:

1120

1069

1121

1070

fprintf_plus(stderr, "(Avahi browser) %s\n",

1122

avahi_strerror(avahi_server_errno

1123

(((mandos_context*)mc)->server)));

1124

avahi_simple_poll_quit(simple_poll);

1071

avahi_strerror(avahi_server_errno(mc.server)));

1072

avahi_simple_poll_quit(mc.simple_poll);

1125

1073

return;

1126

1074

1127

1075

case AVAHI_BROWSER_NEW:

1130

1078

the callback function is called the Avahi server will free the

1131

1079

resolver for us. */

1132

1080

1133

if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,

1134

interface, protocol, name, type,

1135

domain, protocol, 0,

1136

resolve_callback, mc) == NULL)

1081

if(avahi_s_service_resolver_new(mc.server, interface, protocol,

1082

name, type, domain, protocol, 0,

1083

resolve_callback, NULL) == NULL)

1137

1084

fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"

1138

1085

" %s\n", name,

1139

avahi_strerror(avahi_server_errno

1140

(((mandos_context*)mc)->server)));

1086

avahi_strerror(avahi_server_errno(mc.server)));

1141

1087

break;

1142

1088

1143

1089

case AVAHI_BROWSER_REMOVE:

1162

1108

signal_received = sig;

1163

1109

int old_errno = errno;

1164

1110

/* set main loop to exit */

1165

if(simple_poll != NULL){

1166

avahi_simple_poll_quit(simple_poll);

1111

if(mc.simple_poll != NULL){

1112

avahi_simple_poll_quit(mc.simple_poll);

1167

1113

}

1168

1114

errno = old_errno;

1169

1115

}

1170

1116

1171

1117

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

1172

1118

int ret;

1173

error_t ret_errno;

1174

1119

1175

1120

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

1176

1121

if(s < 0){

1177

ret_errno = errno;

1178

1122

perror_plus("socket");

1179

errno = ret_errno;

1180

1123

return false;

1181

1124

}

1182

1125

strcpy(ifr->ifr_name, ifname);

1183

1126

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1184

1127

if(ret == -1){

1185

1128

if(debug){

1186

ret_errno = errno;

1187

1129

perror_plus("ioctl SIOCGIFFLAGS");

1188

errno = ret_errno;

1189

1130

}

1190

1131

return false;

1191

1132

}

1260

1201

}

1261

1202

1262

1203

/*

1263

* This function determines if a network interface is up.

1264

*/

1265

bool interface_is_up(const char *interface){

1266

struct ifreq ifr;

1267

if(not get_flags(interface, &ifr)){

1268

if(debug){

1269

fprintf_plus(stderr, "Failed to get flags for interface "

1270

"\"%s\"\n", interface);

1271

}

1272

return false;

1273

}

1274

1275

return (bool)(ifr.ifr_flags & IFF_UP);

1276

}

1277

1278

/*

1279

* This function determines if a network interface is running

1280

*/

1281

bool interface_is_running(const char *interface){

1282

struct ifreq ifr;

1283

if(not get_flags(interface, &ifr)){

1284

if(debug){

1285

fprintf_plus(stderr, "Failed to get flags for interface "

1286

"\"%s\"\n", interface);

1287

}

1288

return false;

1289

}

1290

1291

return (bool)(ifr.ifr_flags & IFF_RUNNING);

1204

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

1205

* corresponds to an acceptable network device which is up.

1206

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

1207

*/

1208

int up_interface(const struct dirent *if_entry){

1209

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

1210

return 0;

1211

}

1212

1213

struct ifreq ifr;

1214

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

1215

if(debug){

1216

fprintf_plus(stderr, "Failed to get flags for interface "

1217

"\"%s\"\n", if_entry->d_name);

1218

}

1219

return 0;

1220

}

1221

1222

/* Reject down interfaces */

1223

if(not (ifr.ifr_flags & IFF_UP)){

1224

if(debug){

1225

fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",

1226

if_entry->d_name);

1227

}

1228

return 0;

1229

}

1230

1231

/* Reject non-running interfaces */

1232

if(not (ifr.ifr_flags & IFF_RUNNING)){

1233

if(debug){

1234

fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",

1235

if_entry->d_name);

1236

}

1237

return 0;

1238

}

1239

1240

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

1241

return 0;

1242

}

1243

return 1;

1292

1244

}

1293

1245

1294

1246

int notdotentries(const struct dirent *direntry){

1363

1315

return 1;

1364

1316

}

1365

1317

1366

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1367

mandos_context *mc){

1318

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1368

1319

int ret;

1369

1320

struct timespec now;

1370

1321

struct timespec waited_time;

1371

1322

intmax_t block_time;

1372

1323

1373

1324

while(true){

1374

if(mc->current_server == NULL){

1325

if(mc.current_server == NULL){

1375

1326

if (debug){

1376

1327

fprintf_plus(stderr, "Wait until first server is found."

1377

1328

" No timeout!\n");

1391

1342

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

1392

1343

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

1393

1344

waited_time.tv_sec = (now.tv_sec

1394

- mc->current_server->last_seen.tv_sec);

1345

- mc.current_server->last_seen.tv_sec);

1395

1346

waited_time.tv_nsec = (now.tv_nsec

1396

- mc->current_server->last_seen.tv_nsec);

1347

- mc.current_server->last_seen.tv_nsec);

1397

1348

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

1398

1349

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

1399

1350

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

1407

1358

}

1408

1359

1409

1360

if(block_time <= 0){

1410

ret = start_mandos_communication(mc->current_server->ip,

1411

mc->current_server->port,

1412

mc->current_server->if_index,

1413

mc->current_server->af, mc);

1361

ret = start_mandos_communication(mc.current_server->ip,

1362

mc.current_server->port,

1363

mc.current_server->if_index,

1364

mc.current_server->af);

1414

1365

if(ret == 0){

1415

avahi_simple_poll_quit(s);

1366

avahi_simple_poll_quit(mc.simple_poll);

1416

1367

return 0;

1417

1368

}

1418

1369

ret = clock_gettime(CLOCK_MONOTONIC,

1419

&mc->current_server->last_seen);

1370

&mc.current_server->last_seen);

1420

1371

if(ret == -1){

1421

1372

perror_plus("clock_gettime");

1422

1373

return -1;

1423

1374

}

1424

mc->current_server = mc->current_server->next;

1375

mc.current_server = mc.current_server->next;

1425

1376

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

1426

1377

servers, but don't block */

1427

1378

}

1436

1387

}

1437

1388

}

1438

1389

1439

/* Set effective uid to 0, return errno */

1440

error_t raise_privileges(void){

1441

error_t old_errno = errno;

1442

error_t ret_errno = 0;

1443

if(seteuid(0) == -1){

1444

ret_errno = errno;

1445

perror_plus("seteuid");

1446

}

1447

errno = old_errno;

1448

return ret_errno;

1449

}

1450

1451

/* Set effective and real user ID to 0. Return errno. */

1452

error_t raise_privileges_permanently(void){

1453

error_t old_errno = errno;

1454

error_t ret_errno = raise_privileges();

1455

if(ret_errno != 0){

1456

errno = old_errno;

1457

return ret_errno;

1458

}

1459

if(setuid(0) == -1){

1460

ret_errno = errno;

1461

perror_plus("seteuid");

1462

}

1463

errno = old_errno;

1464

return ret_errno;

1465

}

1466

1467

/* Set effective user ID to unprivileged saved user ID */

1468

error_t lower_privileges(void){

1469

error_t old_errno = errno;

1470

error_t ret_errno = 0;

1471

if(seteuid(uid) == -1){

1472

ret_errno = errno;

1473

perror_plus("seteuid");

1474

}

1475

errno = old_errno;

1476

return ret_errno;

1477

}

1478

1479

/* Lower privileges permanently */

1480

error_t lower_privileges_permanently(void){

1481

error_t old_errno = errno;

1482

error_t ret_errno = 0;

1483

if(setuid(uid) == -1){

1484

ret_errno = errno;

1485

perror_plus("setuid");

1486

}

1487

errno = old_errno;

1488

return ret_errno;

1489

}

1490

1491

1390

bool run_network_hooks(const char *mode, const char *interface,

1492

1391

const float delay){

1493

1392

struct dirent **direntries;

1393

struct dirent *direntry;

1394

int ret;

1494

1395

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

1495

1396

alphasort);

1496

1397

if(numhooks == -1){

1497

if(errno == ENOENT){

1498

if(debug){

1499

fprintf_plus(stderr, "Network hook directory \"%s\" not"

1500

" found\n", hookdir);

1501

}

1502

} else {

1503

perror_plus("scandir");

1504

}

1398

perror_plus("scandir");

1505

1399

} else {

1506

struct dirent *direntry;

1507

int ret;

1508

1400

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

1509

1401

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

1510

1402

direntry = direntries[i];

1522

1414

if(hook_pid == 0){

1523

1415

/* Child */

1524

1416

/* Raise privileges */

1525

raise_privileges_permanently();

1417

errno = 0;

1418

ret = seteuid(0);

1419

if(ret == -1){

1420

perror_plus("seteuid");

1421

}

1422

/* Raise privileges even more */

1423

errno = 0;

1424

ret = setuid(0);

1425

if(ret == -1){

1426

perror_plus("setuid");

1427

}

1526

1428

/* Set group */

1527

1429

errno = 0;

1528

1430

ret = setgid(0);

1621

1523

return true;

1622

1524

}

1623

1525

1624

error_t bring_up_interface(const char *const interface,

1625

const float delay){

1626

int sd = -1;

1627

error_t old_errno = errno;

1628

error_t ret_errno = 0;

1629

int ret, ret_setflags;

1630

struct ifreq network;

1631

unsigned int if_index = if_nametoindex(interface);

1632

if(if_index == 0){

1633

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

1634

errno = old_errno;

1635

return ENXIO;

1636

}

1637

1638

if(quit_now){

1639

errno = old_errno;

1640

return EINTR;

1641

}

1642

1643

if(not interface_is_up(interface)){

1644

if(not get_flags(interface, &network) and debug){

1645

ret_errno = errno;

1646

fprintf_plus(stderr, "Failed to get flags for interface "

1647

"\"%s\"\n", interface);

1648

return ret_errno;

1649

}

1650

network.ifr_flags |= IFF_UP;

1651

1652

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1653

if(sd < 0){

1654

ret_errno = errno;

1655

perror_plus("socket");

1656

errno = old_errno;

1657

return ret_errno;

1658

}

1659

1660

if(quit_now){

1661

close(sd);

1662

errno = old_errno;

1663

return EINTR;

1664

}

1665

1666

if(debug){

1667

fprintf_plus(stderr, "Bringing up interface \"%s\"\n",

1668

interface);

1669

}

1670

1671

/* Raise priviliges */

1672

raise_privileges();

1673

1674

#ifdef __linux__

1675

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1676

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

1677

int ret_linux = klogctl(8, NULL, 5);

1678

bool restore_loglevel = true;

1679

if(ret_linux == -1){

1680

restore_loglevel = false;

1681

perror_plus("klogctl");

1682

}

1683

#endif /* __linux__ */

1684

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

1685

ret_errno = errno;

1686

#ifdef __linux__

1687

if(restore_loglevel){

1688

ret_linux = klogctl(7, NULL, 0);

1689

if(ret_linux == -1){

1690

perror_plus("klogctl");

1691

}

1692

}

1693

#endif /* __linux__ */

1694

1695

/* Lower privileges */

1696

lower_privileges();

1697

1698

/* Close the socket */

1699

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

1700

if(ret == -1){

1701

perror_plus("close");

1702

}

1703

1704

if(ret_setflags == -1){

1705

errno = ret_errno;

1706

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1707

errno = old_errno;

1708

return ret_errno;

1709

}

1710

} else if(debug){

1711

fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",

1712

interface);

1713

}

1714

1715

/* Sleep checking until interface is running.

1716

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

1717

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

1718

if(interface_is_running(interface)){

1719

break;

1720

}

1721

struct timespec sleeptime = { .tv_nsec = 250000000 };

1722

ret = nanosleep(&sleeptime, NULL);

1723

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

1724

perror_plus("nanosleep");

1725

}

1726

}

1727

1728

errno = old_errno;

1729

return 0;

1730

}

1731

1732

error_t take_down_interface(const char *const interface){

1733

error_t old_errno = errno;

1734

struct ifreq network;

1735

unsigned int if_index = if_nametoindex(interface);

1736

if(if_index == 0){

1737

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

1738

errno = old_errno;

1739

return ENXIO;

1740

}

1741

if(interface_is_up(interface)){

1742

error_t ret_errno = 0;

1743

if(not get_flags(interface, &network) and debug){

1744

ret_errno = errno;

1745

fprintf_plus(stderr, "Failed to get flags for interface "

1746

"\"%s\"\n", interface);

1747

return ret_errno;

1748

}

1749

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

1750

1751

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

1752

if(sd < 0){

1753

ret_errno = errno;

1754

perror_plus("socket");

1755

errno = old_errno;

1756

return ret_errno;

1757

}

1758

1759

if(debug){

1760

fprintf_plus(stderr, "Taking down interface \"%s\"\n",

1761

interface);

1762

}

1763

1764

/* Raise priviliges */

1765

raise_privileges();

1766

1767

int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);

1768

ret_errno = errno;

1769

1770

/* Lower privileges */

1771

lower_privileges();

1772

1773

/* Close the socket */

1774

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

1775

if(ret == -1){

1776

perror_plus("close");

1777

}

1778

1779

if(ret_setflags == -1){

1780

errno = ret_errno;

1781

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1782

errno = old_errno;

1783

return ret_errno;

1784

}

1785

} else if(debug){

1786

fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",

1787

interface);

1788

}

1789

1790

errno = old_errno;

1791

return 0;

1792

}

1793

1794

1526

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

1795

mandos_context mc = { .server = NULL, .dh_bits = 1024,

1796

.priority = "SECURE256:!CTYPE-X.509:"

1797

"+CTYPE-OPENPGP", .current_server = NULL,

1798

.interfaces = NULL, .interfaces_size = 0 };

1799

1527

AvahiSServiceBrowser *sb = NULL;

1800

error_t ret_errno;

1528

int error;

1801

1529

int ret;

1802

1530

intmax_t tmpmax;

1803

1531

char *tmp;

1804

1532

int exitcode = EXIT_SUCCESS;

1805

char *interfaces_to_take_down = NULL;

1806

size_t interfaces_to_take_down_size = 0;

1533

const char *interface = "";

1534

struct ifreq network;

1535

int sd = -1;

1536

bool take_down_interface = false;

1537

uid_t uid;

1538

gid_t gid;

1807

1539

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

1808

1540

bool tempdir_created = false;

1809

1541

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1810

1542

const char *seckey = PATHDIR "/" SECKEY;

1811

1543

const char *pubkey = PATHDIR "/" PUBKEY;

1812

char *interfaces_hooks = NULL;

1813

1544

1814

1545

bool gnutls_initialized = false;

1815

1546

bool gpgme_initialized = false;

1906

1637

connect_to = arg;

1907

1638

break;

1908

1639

case 'i': /* --interface */

1909

ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,

1910

arg, (int)',');

1911

if(ret_errno != 0){

1912

argp_error(state, "%s", strerror(ret_errno));

1913

}

1640

interface = arg;

1914

1641

break;

1915

1642

case 's': /* --seckey */

1916

1643

seckey = arg;

1994

1721

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

1995

1722

1996

1723

/* Re-raise priviliges */

1997

if(raise_privileges() == 0){

1724

errno = 0;

1725

ret = seteuid(0);

1726

if(ret == -1){

1727

perror_plus("seteuid");

1728

} else {

1998

1729

struct stat st;

1999

1730

2000

1731

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

2040

1771

}

2041

1772

2042

1773

/* Lower privileges */

2043

lower_privileges();

2044

}

2045

}

2046

2047

/* Remove invalid interface names (except "none") */

2048

{

2049

char *interface = NULL;

2050

while((interface = argz_next(mc.interfaces, mc.interfaces_size,

2051

interface))){

2052

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

2053

and if_nametoindex(interface) == 0){

2054

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

2055

fprintf_plus(stderr, "Not using nonexisting interface"

2056

" \"%s\"\n", interface);

2057

}

2058

argz_delete(&mc.interfaces, &mc.interfaces_size, interface);

2059

interface = NULL;

1774

errno = 0;

1775

ret = seteuid(uid);

1776

if(ret == -1){

1777

perror_plus("seteuid");

2060

1778

}

2061

1779

}

2062

1780

}

2063

1781

2064

1782

/* Run network hooks */

2065

{

2066

if(mc.interfaces != NULL){

2067

interfaces_hooks = malloc(mc.interfaces_size);

2068

if(interfaces_hooks == NULL){

2069

perror_plus("malloc");

2070

goto end;

2071

}

2072

memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);

2073

argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');

2074

}

2075

if(not run_network_hooks("start", interfaces_hooks != NULL ?

2076

interfaces_hooks : "", delay)){

2077

goto end;

2078

}

1783

if(not run_network_hooks("start", interface, delay)){

1784

goto end;

2079

1785

}

2080

1786

2081

1787

if(not debug){

2082

1788

avahi_set_log_function(empty_log);

2083

1789

}

2084

1790

1791

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

1792

struct dirent **direntries;

1793

/* First look for interfaces that are up */

1794

ret = scandir(sys_class_net, &direntries, up_interface,

1795

alphasort);

1796

if(ret == 0){

1797

/* No up interfaces, look for any good interfaces */

1798

free(direntries);

1799

ret = scandir(sys_class_net, &direntries, good_interface,

1800

alphasort);

1801

}

1802

if(ret >= 1){

1803

/* Pick the first interface returned */

1804

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

1805

if(debug){

1806

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

1807

}

1808

if(interface == NULL){

1809

perror_plus("malloc");

1810

free(direntries);

1811

exitcode = EXIT_FAILURE;

1812

goto end;

1813

}

1814

free(direntries);

1815

} else {

1816

free(direntries);

1817

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

1818

exitcode = EXIT_FAILURE;

1819

goto end;

1820

}

1821

}

1822

2085

1823

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

2086

1824

from the signal handler */

2087

1825

/* Initialize the pseudo-RNG for Avahi */

2088

1826

srand((unsigned int) time(NULL));

2089

simple_poll = avahi_simple_poll_new();

2090

if(simple_poll == NULL){

1827

mc.simple_poll = avahi_simple_poll_new();

1828

if(mc.simple_poll == NULL){

2091

1829

fprintf_plus(stderr,

2092

1830

"Avahi: Failed to create simple poll object.\n");

2093

1831

exitcode = EX_UNAVAILABLE;

2157

1895

}

2158

1896

}

2159

1897

2160

/* If no interfaces were specified, make a list */

2161

if(mc.interfaces == NULL){

2162

struct dirent **direntries;

2163

/* Look for any good interfaces */

2164

ret = scandir(sys_class_net, &direntries, good_interface,

2165

alphasort);

2166

if(ret >= 1){

2167

/* Add all found interfaces to interfaces list */

2168

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

2169

ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,

2170

direntries[i]->d_name);

2171

if(ret_errno != 0){

2172

errno = ret_errno;

2173

perror_plus("argz_add");

2174

continue;

2175

}

2176

if(debug){

2177

fprintf_plus(stderr, "Will use interface \"%s\"\n",

2178

direntries[i]->d_name);

2179

}

2180

}

2181

free(direntries);

2182

} else {

2183

free(direntries);

2184

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

2185

exitcode = EXIT_FAILURE;

2186

goto end;

2187

}

2188

}

2189

2190

/* Bring up interfaces which are down, and remove any "none"s */

2191

{

2192

char *interface = NULL;

2193

while((interface = argz_next(mc.interfaces, mc.interfaces_size,

2194

interface))){

2195

/* If interface name is "none", stop bringing up interfaces.

2196

Also remove all instances of "none" from the list */

2197

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

2198

argz_delete(&mc.interfaces, &mc.interfaces_size,

2199

interface);

2200

interface = NULL;

2201

while((interface = argz_next(mc.interfaces,

2202

mc.interfaces_size, interface))){

2203

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

2204

argz_delete(&mc.interfaces, &mc.interfaces_size,

2205

interface);

2206

interface = NULL;

1898

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

1899

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

1900

if_index = (AvahiIfIndex) if_nametoindex(interface);

1901

if(if_index == 0){

1902

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

1903

exitcode = EX_UNAVAILABLE;

1904

goto end;

1905

}

1906

1907

if(quit_now){

1908

goto end;

1909

}

1910

1911

/* Re-raise priviliges */

1912

errno = 0;

1913

ret = seteuid(0);

1914

if(ret == -1){

1915

perror_plus("seteuid");

1916

}

1917

1918

#ifdef __linux__

1919

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1920

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

1921

ret = klogctl(8, NULL, 5);

1922

bool restore_loglevel = true;

1923

if(ret == -1){

1924

restore_loglevel = false;

1925

perror_plus("klogctl");

1926

}

1927

#endif /* __linux__ */

1928

1929

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1930

if(sd < 0){

1931

perror_plus("socket");

1932

exitcode = EX_OSERR;

1933

#ifdef __linux__

1934

if(restore_loglevel){

1935

ret = klogctl(7, NULL, 0);

1936

if(ret == -1){

1937

perror_plus("klogctl");

1938

}

1939

}

1940

#endif /* __linux__ */

1941

/* Lower privileges */

1942

errno = 0;

1943

ret = seteuid(uid);

1944

if(ret == -1){

1945

perror_plus("seteuid");

1946

}

1947

goto end;

1948

}

1949

strcpy(network.ifr_name, interface);

1950

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

1951

if(ret == -1){

1952

perror_plus("ioctl SIOCGIFFLAGS");

1953

#ifdef __linux__

1954

if(restore_loglevel){

1955

ret = klogctl(7, NULL, 0);

1956

if(ret == -1){

1957

perror_plus("klogctl");

1958

}

1959

}

1960

#endif /* __linux__ */

1961

exitcode = EX_OSERR;

1962

/* Lower privileges */

1963

errno = 0;

1964

ret = seteuid(uid);

1965

if(ret == -1){

1966

perror_plus("seteuid");

1967

}

1968

goto end;

1969

}

1970

if((network.ifr_flags & IFF_UP) == 0){

1971

network.ifr_flags |= IFF_UP;

1972

take_down_interface = true;

1973

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

1974

if(ret == -1){

1975

take_down_interface = false;

1976

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1977

exitcode = EX_OSERR;

1978

#ifdef __linux__

1979

if(restore_loglevel){

1980

ret = klogctl(7, NULL, 0);

1981

if(ret == -1){

1982

perror_plus("klogctl");

2207

1983

}

2208

1984

}

1985

#endif /* __linux__ */

1986

/* Lower privileges */

1987

errno = 0;

1988

ret = seteuid(uid);

1989

if(ret == -1){

1990

perror_plus("seteuid");

1991

}

1992

goto end;

1993

}

1994

}

1995

/* Sleep checking until interface is running.

1996

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

1997

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

1998

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

1999

if(ret == -1){

2000

perror_plus("ioctl SIOCGIFFLAGS");

2001

} else if(network.ifr_flags & IFF_RUNNING){

2209

2002

break;

2210

2003

}

2211

bool interface_was_up = interface_is_up(interface);

2212

ret = bring_up_interface(interface, delay);

2213

if(not interface_was_up){

2214

if(ret != 0){

2215

errno = ret;

2216

perror_plus("Failed to bring up interface");

2217

} else {

2218

ret_errno = argz_add(&interfaces_to_take_down,

2219

&interfaces_to_take_down_size,

2220

interface);

2221

if(ret_errno != 0){

2222

errno = ret_errno;

2223

perror_plus("argz_add");

2224

}

2225

}

2226

}

2227

}

2228

if(debug and (interfaces_to_take_down == NULL)){

2229

fprintf_plus(stderr, "No interfaces were brought up\n");

2230

}

2231

}

2232

2233

/* If we only got one interface, explicitly use only that one */

2234

if(argz_count(mc.interfaces, mc.interfaces_size) == 1){

2235

if(debug){

2236

fprintf_plus(stderr, "Using only interface \"%s\"\n",

2237

mc.interfaces);

2238

}

2239

if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);

2004

struct timespec sleeptime = { .tv_nsec = 250000000 };

2005

ret = nanosleep(&sleeptime, NULL);

2006

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

2007

perror_plus("nanosleep");

2008

}

2009

}

2010

if(not take_down_interface){

2011

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

2012

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

2013

if(ret == -1){

2014

perror_plus("close");

2015

}

2016

}

2017

#ifdef __linux__

2018

if(restore_loglevel){

2019

/* Restores kernel loglevel to default */

2020

ret = klogctl(7, NULL, 0);

2021

if(ret == -1){

2022

perror_plus("klogctl");

2023

}

2024

}

2025

#endif /* __linux__ */

2026

/* Lower privileges */

2027

errno = 0;

2028

/* Lower privileges */

2029

ret = seteuid(uid);

2030

if(ret == -1){

2031

perror_plus("seteuid");

2032

}

2240

2033

}

2241

2034

2242

2035

if(quit_now){

2243

2036

goto end;

2244

2037

}

2245

2038

2246

ret = init_gnutls_global(pubkey, seckey, &mc);

2039

ret = init_gnutls_global(pubkey, seckey);

2247

2040

if(ret == -1){

2248

2041

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

2249

2042

exitcode = EX_UNAVAILABLE;

2266

2059

goto end;

2267

2060

}

2268

2061

2269

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

2062

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

2270

2063

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

2271

2064

exitcode = EX_UNAVAILABLE;

2272

2065

goto end;

2282

2075

/* Connect directly, do not use Zeroconf */

2283

2076

/* (Mainly meant for debugging) */

2284

2077

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

2285

2286

2078

if(address == NULL){

2287

2079

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

2288

2080

exitcode = EX_USAGE;

2293

2085

goto end;

2294

2086

}

2295

2087

2296

in_port_t port;

2088

uint16_t port;

2297

2089

errno = 0;

2298

2090

tmpmax = strtoimax(address+1, &tmp, 10);

2299

2091

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

2300

or tmpmax != (in_port_t)tmpmax){

2092

or tmpmax != (uint16_t)tmpmax){

2301

2093

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

2302

2094

exitcode = EX_USAGE;

2303

2095

goto end;

2304

2096

}

2305

2097

2306

2098

if(quit_now){

2307

2099

goto end;

2308

2100

}

2309

2101

2310

port = (in_port_t)tmpmax;

2102

port = (uint16_t)tmpmax;

2311

2103

*address = '\0';

2312

2104

/* Colon in address indicates IPv6 */

2313

2105

int af;

2329

2121

}

2330

2122

2331

2123

while(not quit_now){

2332

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

2333

&mc);

2124

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

2334

2125

if(quit_now or ret == 0){

2335

2126

break;

2336

2127

}

2338

2129

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

2339

2130

(int)retry_interval);

2340

2131

}

2341

sleep((unsigned int)retry_interval);

2132

sleep((int)retry_interval);

2342

2133

}

2343

2134

2344

2135

if (not quit_now){

2362

2153

config.publish_domain = 0;

2363

2154

2364

2155

/* Allocate a new server */

2365

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2366

&config, NULL, NULL, &ret_errno);

2156

mc.server = avahi_server_new(avahi_simple_poll_get

2157

(mc.simple_poll), &config, NULL,

2158

NULL, &error);

2367

2159

2368

2160

/* Free the Avahi configuration data */

2369

2161

avahi_server_config_free(&config);

2372

2164

/* Check if creating the Avahi server object succeeded */

2373

2165

if(mc.server == NULL){

2374

2166

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

2375

avahi_strerror(ret_errno));

2167

avahi_strerror(error));

2376

2168

exitcode = EX_UNAVAILABLE;

2377

2169

goto end;

2378

2170

}

2384

2176

/* Create the Avahi service browser */

2385

2177

sb = avahi_s_service_browser_new(mc.server, if_index,

2386

2178

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2387

NULL, 0, browse_callback,

2388

(void *)&mc);

2179

NULL, 0, browse_callback, NULL);

2389

2180

if(sb == NULL){

2390

2181

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

2391

2182

avahi_strerror(avahi_server_errno(mc.server)));

2403

2194

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

2404

2195

}

2405

2196

2406

ret = avahi_loop_with_timeout(simple_poll,

2407

(int)(retry_interval * 1000), &mc);

2197

ret = avahi_loop_with_timeout(mc.simple_poll,

2198

(int)(retry_interval * 1000));

2408

2199

if(debug){

2409

2200

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

2410

2201

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

2417

2208

}

2418

2209

2419

2210

/* Cleanup things */

2420

free(mc.interfaces);

2421

2422

2211

if(sb != NULL)

2423

2212

avahi_s_service_browser_free(sb);

2424

2213

2425

2214

if(mc.server != NULL)

2426

2215

avahi_server_free(mc.server);

2427

2216

2428

if(simple_poll != NULL)

2429

avahi_simple_poll_free(simple_poll);

2217

if(mc.simple_poll != NULL)

2218

avahi_simple_poll_free(mc.simple_poll);

2430

2219

2431

2220

if(gnutls_initialized){

2432

2221

gnutls_certificate_free_credentials(mc.cred);

2449

2238

}

2450

2239

}

2451

2240

2241

/* Run network hooks */

2242

run_network_hooks("stop", interface, delay);

2243

2452

2244

/* Re-raise priviliges */

2453

2245

{

2454

raise_privileges();

2455

2456

/* Run network hooks */

2457

run_network_hooks("stop", interfaces_hooks != NULL ?

2458

interfaces_hooks : "", delay);

2459

2460

/* Take down the network interfaces which were brought up */

2461

{

2462

char *interface = NULL;

2463

while((interface=argz_next(interfaces_to_take_down,

2464

interfaces_to_take_down_size,

2465

interface))){

2466

ret_errno = take_down_interface(interface);

2467

if(ret_errno != 0){

2468

errno = ret_errno;

2469

perror_plus("Failed to take down interface");

2246

errno = 0;

2247

ret = seteuid(0);

2248

if(ret == -1){

2249

perror_plus("seteuid");

2250

}

2251

2252

/* Take down the network interface */

2253

if(take_down_interface and geteuid() == 0){

2254

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

2255

if(ret == -1){

2256

perror_plus("ioctl SIOCGIFFLAGS");

2257

} else if(network.ifr_flags & IFF_UP){

2258

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

2259

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

2260

if(ret == -1){

2261

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2470

2262

}

2471

2263

}

2472

if(debug and (interfaces_to_take_down == NULL)){

2473

fprintf_plus(stderr, "No interfaces needed to be taken"

2474

" down\n");

2264

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

2265

if(ret == -1){

2266

perror_plus("close");

2475

2267

}

2476

2268

}

2477

2478

lower_privileges_permanently();

2479

}

2480

2481

free(interfaces_to_take_down);

2482

free(interfaces_hooks);

2269

}

2270

/* Lower privileges permanently */

2271

errno = 0;

2272

ret = setuid(uid);

2273

if(ret == -1){

2274

perror_plus("setuid");

2275

}

2483

2276

2484

2277

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

2485

2278

if(tempdir_created){