/mandos/trunk : revision 594.1.4

9

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

10

*

11

* Everything else is

12

13

12

13

14

*

15

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

16

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

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,

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

95

98

96

#ifdef __linux__

99

97

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

136

134

137

135

bool debug = false;

138

136

static const char mandos_protocol_version[] = "1";

139

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

140

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

137

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

138

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

141

139

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

142

140

char *connect_to = NULL;

143

141

const char *hookdir = HOOKDIR;

147

145

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

148

146

typedef struct server{

149

147

const char *ip;

150

in_port_t port;

148

uint16_t port;

151

149

AvahiIfIndex if_index;

152

150

int af;

153

151

struct timespec last_seen;

157

155

158

156

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

159

157

typedef struct {

158

AvahiSimplePoll *simple_poll;

160

159

AvahiServer *server;

161

160

gnutls_certificate_credentials_t cred;

162

161

unsigned int dh_bits;

164

163

const char *priority;

165

164

gpgme_ctx_t ctx;

166

165

server *current_server;

167

char *interfaces;

168

size_t interfaces_size;

169

166

} mandos_context;

170

167

171

/* global so signal handler can reach it*/

172

AvahiSimplePoll *simple_poll;

168

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

169

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

170

.dh_bits = 1024, .priority = "SECURE256"

171

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

172

.current_server = NULL };

173

174

sig_atomic_t quit_now = 0;

175

int signal_received = 0;

183

perror(print_text);

184

}

185

186

__attribute__((format (gnu_printf, 2, 3), nonnull))

186

__attribute__((format (gnu_printf, 2, 3)))

187

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

188

va_list ap;

189

va_start (ap, format);

190

191

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

192

program_invocation_short_name));

193

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

193

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

194

}

195

196

/*

198

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

199

* "buffer_length" is how much is already used.

200

*/

201

__attribute__((nonnull, warn_unused_result))

202

201

size_t incbuffer(char **buffer, size_t buffer_length,

203

202

size_t buffer_capacity){

204

203

if(buffer_length + BUFFER_SIZE > buffer_capacity){

205

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

206

if(new_buf == NULL){

207

int old_errno = errno;

208

free(*buffer);

209

errno = old_errno;

210

*buffer = NULL;

204

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

205

if(buffer == NULL){

211

206

return 0;

212

207

}

213

*buffer = new_buf;

214

208

buffer_capacity += BUFFER_SIZE;

215

209

}

216

210

return buffer_capacity;

217

211

}

218

212

219

213

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

220

__attribute__((nonnull, warn_unused_result))

221

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

222

int af, server **current_server){

214

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

215

int af){

223

216

int ret;

224

217

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

225

218

if(new_server == NULL){

234

227

perror_plus("strdup");

235

228

return false;

236

229

}

237

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

238

if(ret == -1){

239

perror_plus("clock_gettime");

240

return false;

241

}

242

230

/* Special case of first server */

243

if(*current_server == NULL){

231

if (mc.current_server == NULL){

244

232

new_server->next = new_server;

245

233

new_server->prev = new_server;

246

*current_server = new_server;

234

mc.current_server = new_server;

235

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

247

236

} else {

248

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

249

new_server->next = *current_server;

250

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

237

new_server->next = mc.current_server;

238

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

251

239

new_server->prev->next = new_server;

252

(*current_server)->prev = new_server;

240

mc.current_server->prev = new_server;

241

}

242

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

243

if(ret == -1){

244

perror_plus("clock_gettime");

245

return false;

253

246

}

254

247

return true;

255

248

}

257

250

/*

258

251

* Initialize GPGME.

259

252

*/

260

__attribute__((nonnull, warn_unused_result))

261

static bool init_gpgme(const char * const seckey,

262

const char * const pubkey,

263

const char * const tempdir,

264

mandos_context *mc){

253

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

254

const char *tempdir){

265

255

gpgme_error_t rc;

266

256

gpgme_engine_info_t engine_info;

267

257

258

268

259

/*

269

260

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

270

261

*/

271

bool import_key(const char * const filename){

262

bool import_key(const char *filename){

272

263

int ret;

273

264

int fd;

274

265

gpgme_data_t pgp_data;

286

277

return false;

287

278

}

288

279

289

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

280

rc = gpgme_op_import(mc.ctx, pgp_data);

290

281

if(rc != GPG_ERR_NO_ERROR){

291

282

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

292

283

gpgme_strsource(rc), gpgme_strerror(rc));

336

327

}

337

328

338

329

/* Create new GPGME "context" */

339

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

330

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

340

331

if(rc != GPG_ERR_NO_ERROR){

341

332

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

342

333

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

355

346

* Decrypt OpenPGP data.

356

347

* Returns -1 on error

357

348

*/

358

__attribute__((nonnull, warn_unused_result))

359

349

static ssize_t pgp_packet_decrypt(const char *cryptotext,

360

350

size_t crypto_size,

361

char **plaintext,

362

mandos_context *mc){

351

char **plaintext){

363

352

gpgme_data_t dh_crypto, dh_plain;

364

353

gpgme_error_t rc;

365

354

ssize_t ret;

391

380

392

381

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

393

382

data buffer */

394

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

383

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

395

384

if(rc != GPG_ERR_NO_ERROR){

396

385

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

397

386

gpgme_strsource(rc), gpgme_strerror(rc));

398

387

plaintext_length = -1;

399

388

if(debug){

400

389

gpgme_decrypt_result_t result;

401

result = gpgme_op_decrypt_result(mc->ctx);

390

result = gpgme_op_decrypt_result(mc.ctx);

402

391

if(result == NULL){

403

392

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

404

393

} else {

481

470

return plaintext_length;

482

471

}

483

472

484

__attribute__((warn_unused_result))

485

static const char *safer_gnutls_strerror(int value){

486

const char *ret = gnutls_strerror(value);

473

static const char * safer_gnutls_strerror(int value){

474

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

475

-Wunreachable-code */

487

476

if(ret == NULL)

488

477

ret = "(unknown)";

489

478

return ret;

490

479

}

491

480

492

481

/* GnuTLS log function callback */

493

__attribute__((nonnull))

494

482

static void debuggnutls(__attribute__((unused)) int level,

495

483

const char* string){

496

484

fprintf_plus(stderr, "GnuTLS: %s", string);

497

485

}

498

486

499

__attribute__((nonnull, warn_unused_result))

500

487

static int init_gnutls_global(const char *pubkeyfilename,

501

const char *seckeyfilename,

502

mandos_context *mc){

488

const char *seckeyfilename){

503

489

int ret;

504

490

505

491

if(debug){

522

508

}

523

509

524

510

/* OpenPGP credentials */

525

ret = gnutls_certificate_allocate_credentials(&mc->cred);

511

ret = gnutls_certificate_allocate_credentials(&mc.cred);

526

512

if(ret != GNUTLS_E_SUCCESS){

527

513

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

528

514

safer_gnutls_strerror(ret));

538

524

}

539

525

540

526

ret = gnutls_certificate_set_openpgp_key_file

541

(mc->cred, pubkeyfilename, seckeyfilename,

527

(mc.cred, pubkeyfilename, seckeyfilename,

542

528

GNUTLS_OPENPGP_FMT_BASE64);

543

529

if(ret != GNUTLS_E_SUCCESS){

544

530

fprintf_plus(stderr,

550

536

}

551

537

552

538

/* GnuTLS server initialization */

553

ret = gnutls_dh_params_init(&mc->dh_params);

539

ret = gnutls_dh_params_init(&mc.dh_params);

554

540

if(ret != GNUTLS_E_SUCCESS){

555

541

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

556

542

" initialization: %s\n",

557

543

safer_gnutls_strerror(ret));

558

544

goto globalfail;

559

545

}

560

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

546

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

561

547

if(ret != GNUTLS_E_SUCCESS){

562

548

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

563

549

safer_gnutls_strerror(ret));

564

550

goto globalfail;

565

551

}

566

552

567

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

553

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

568

554

569

555

return 0;

570

556

571

557

globalfail:

572

558

573

gnutls_certificate_free_credentials(mc->cred);

559

gnutls_certificate_free_credentials(mc.cred);

574

560

gnutls_global_deinit();

575

gnutls_dh_params_deinit(mc->dh_params);

561

gnutls_dh_params_deinit(mc.dh_params);

576

562

return -1;

577

563

}

578

564

579

__attribute__((nonnull, warn_unused_result))

580

static int init_gnutls_session(gnutls_session_t *session,

581

mandos_context *mc){

565

static int init_gnutls_session(gnutls_session_t *session){

582

566

int ret;

583

567

/* GnuTLS session creation */

584

568

do {

596

580

{

597

581

const char *err;

598

582

do {

599

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

583

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

600

584

if(quit_now){

601

585

gnutls_deinit(*session);

602

586

return -1;

613

597

614

598

do {

615

599

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

616

mc->cred);

600

mc.cred);

617

601

if(quit_now){

618

602

gnutls_deinit(*session);

619

603

return -1;

629

613

/* ignore client certificate if any. */

630

614

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

631

615

632

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

616

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

633

617

634

618

return 0;

635

619

}

639

623

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

640

624

641

625

/* Called when a Mandos server is found */

642

__attribute__((nonnull, warn_unused_result))

643

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

626

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

644

627

AvahiIfIndex if_index,

645

int af, mandos_context *mc){

628

int af){

646

629

int ret, tcp_sd = -1;

647

630

ssize_t sret;

648

struct sockaddr_storage to;

631

union {

632

struct sockaddr_in in;

633

struct sockaddr_in6 in6;

634

} to;

649

635

char *buffer = NULL;

650

636

char *decrypted_buffer = NULL;

651

637

size_t buffer_length = 0;

675

661

return -1;

676

662

}

677

663

678

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

679

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

680

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

681

bool match = false;

682

{

683

char *interface = NULL;

684

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

685

interface))){

686

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

687

match = true;

688

break;

689

}

690

}

691

}

692

if(not match){

693

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

694

connect to the server */

695

if(debug){

696

char interface[IF_NAMESIZE];

697

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

698

perror_plus("if_indextoname");

699

} else {

700

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

701

" \"%s\"\n",

702

if_indextoname((unsigned int)if_index,

703

interface));

704

}

705

}

706

return -1;

707

}

708

}

709

710

ret = init_gnutls_session(&session, mc);

664

ret = init_gnutls_session(&session);

711

665

if(ret != 0){

712

666

return -1;

713

667

}

714

668

715

669

if(debug){

716

670

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

717

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

671

PRIu16 "\n", ip, port);

718

672

}

719

673

720

674

tcp_sd = socket(pf, SOCK_STREAM, 0);

732

686

733

687

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

734

688

if(af == AF_INET6){

735

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

736

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

689

to.in6.sin6_family = (sa_family_t)af;

690

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

737

691

} else { /* IPv4 */

738

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

739

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

692

to.in.sin_family = (sa_family_t)af;

693

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

740

694

}

741

695

if(ret < 0 ){

742

696

int e = errno;

751

705

goto mandos_end;

752

706

}

753

707

if(af == AF_INET6){

754

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

755

if(IN6_IS_ADDR_LINKLOCAL

756

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

708

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

709

-Wconversion and

710

-Wunreachable-code */

711

712

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

713

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

714

-Wunreachable-code*/

757

715

if(if_index == AVAHI_IF_UNSPEC){

758

716

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

759

717

" incomplete without a network interface\n");

761

719

goto mandos_end;

762

720

}

763

721

/* Set the network interface number as scope */

764

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

722

to.in6.sin6_scope_id = (uint32_t)if_index;

765

723

}

766

724

} else {

767

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

725

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

726

-Wconversion and

727

-Wunreachable-code */

768

728

}

769

729

770

730

if(quit_now){

778

738

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

779

739

perror_plus("if_indextoname");

780

740

} else {

781

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

782

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

741

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

742

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

783

743

}

784

744

} else {

785

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

786

ip, (uintmax_t)port);

745

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

746

ip, port);

787

747

}

788

748

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

789

749

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

750

const char *pcret;

790

751

if(af == AF_INET6){

791

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

792

sizeof(struct sockaddr_in6),

793

addrstr, sizeof(addrstr), NULL, 0,

794

NI_NUMERICHOST);

752

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

753

sizeof(addrstr));

795

754

} else {

796

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

797

sizeof(struct sockaddr_in),

798

addrstr, sizeof(addrstr), NULL, 0,

799

NI_NUMERICHOST);

755

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

756

sizeof(addrstr));

800

757

}

801

if(ret == EAI_SYSTEM){

802

perror_plus("getnameinfo");

803

} else if(ret != 0) {

804

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

805

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

806

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

758

if(pcret == NULL){

759

perror_plus("inet_ntop");

760

} else {

761

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

762

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

763

}

807

764

}

808

765

}

809

766

813

770

}

814

771

815

772

if(af == AF_INET6){

816

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

817

sizeof(struct sockaddr_in6));

773

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

818

774

} else {

819

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

820

sizeof(struct sockaddr_in));

775

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

821

776

}

822

777

if(ret < 0){

823

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

778

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

824

779

int e = errno;

825

780

perror_plus("connect");

826

781

errno = e;

987

942

if(buffer_length > 0){

988

943

ssize_t decrypted_buffer_size;

989

944

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

990

&decrypted_buffer, mc);

945

&decrypted_buffer);

991

946

if(decrypted_buffer_size >= 0){

992

947

993

948

written = 0;

1041

996

return retval;

1042

997

}

1043

998

1044

__attribute__((nonnull))

1045

999

static void resolve_callback(AvahiSServiceResolver *r,

1046

1000

AvahiIfIndex interface,

1047

1001

AvahiProtocol proto,

1055

1009

AVAHI_GCC_UNUSED AvahiStringList *txt,

1056

1010

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1057

1011

flags,

1058

void *mc){

1059

if(r == NULL){

1060

return;

1061

}

1012

AVAHI_GCC_UNUSED void* userdata){

1013

assert(r);

1062

1014

1063

1015

/* Called whenever a service has been resolved successfully or

1064

1016

timed out */

1073

1025

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

1074

1026

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

1075

1027

domain,

1076

avahi_strerror(avahi_server_errno

1077

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

1028

avahi_strerror(avahi_server_errno(mc.server)));

1078

1029

break;

1079

1030

1080

1031

case AVAHI_RESOLVER_FOUND:

1086

1037

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

1087

1038

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

1088

1039

}

1089

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

1090

interface,

1091

avahi_proto_to_af(proto),

1092

mc);

1040

int ret = start_mandos_communication(ip, port, interface,

1041

avahi_proto_to_af(proto));

1093

1042

if(ret == 0){

1094

avahi_simple_poll_quit(simple_poll);

1043

avahi_simple_poll_quit(mc.simple_poll);

1095

1044

} else {

1096

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

1097

avahi_proto_to_af(proto),

1098

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

1045

if(not add_server(ip, port, interface,

1046

avahi_proto_to_af(proto))){

1099

1047

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

1100

1048

" list\n", name);

1101

1049

}

1114

1062

const char *domain,

1115

1063

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1116

1064

flags,

1117

void *mc){

1118

if(b == NULL){

1119

return;

1120

}

1065

AVAHI_GCC_UNUSED void* userdata){

1066

assert(b);

1121

1067

1122

1068

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

1123

1069

is removed from the LAN */

1131

1077

case AVAHI_BROWSER_FAILURE:

1132

1078

1133

1079

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

1134

avahi_strerror(avahi_server_errno

1135

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

1136

avahi_simple_poll_quit(simple_poll);

1080

avahi_strerror(avahi_server_errno(mc.server)));

1081

avahi_simple_poll_quit(mc.simple_poll);

1137

1082

return;

1138

1083

1139

1084

case AVAHI_BROWSER_NEW:

1142

1087

the callback function is called the Avahi server will free the

1143

1088

resolver for us. */

1144

1089

1145

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

1146

interface, protocol, name, type,

1147

domain, protocol, 0,

1148

resolve_callback, mc) == NULL)

1090

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

1091

name, type, domain, protocol, 0,

1092

resolve_callback, NULL) == NULL)

1149

1093

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

1150

1094

" %s\n", name,

1151

avahi_strerror(avahi_server_errno

1152

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

1095

avahi_strerror(avahi_server_errno(mc.server)));

1153

1096

break;

1154

1097

1155

1098

case AVAHI_BROWSER_REMOVE:

1174

1117

signal_received = sig;

1175

1118

int old_errno = errno;

1176

1119

/* set main loop to exit */

1177

if(simple_poll != NULL){

1178

avahi_simple_poll_quit(simple_poll);

1120

if(mc.simple_poll != NULL){

1121

avahi_simple_poll_quit(mc.simple_poll);

1179

1122

}

1180

1123

errno = old_errno;

1181

1124

}

1182

1125

1183

__attribute__((nonnull, warn_unused_result))

1184

1126

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

1185

1127

int ret;

1186

1128

error_t ret_errno;

1205

1147

return true;

1206

1148

}

1207

1149

1208

__attribute__((nonnull, warn_unused_result))

1209

1150

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

1210

1151

1211

1152

/* Reject the loopback device */

1253

1194

* corresponds to an acceptable network device.

1254

1195

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

1255

1196

*/

1256

__attribute__((nonnull, warn_unused_result))

1257

1197

int good_interface(const struct dirent *if_entry){

1258

1198

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

1259

1199

return 0;

1277

1217

/*

1278

1218

* This function determines if a network interface is up.

1279

1219

*/

1280

__attribute__((nonnull, warn_unused_result))

1281

1220

bool interface_is_up(const char *interface){

1282

1221

struct ifreq ifr;

1283

1222

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

1294

1233

/*

1295

1234

* This function determines if a network interface is running

1296

1235

*/

1297

__attribute__((nonnull, warn_unused_result))

1298

1236

bool interface_is_running(const char *interface){

1299

1237

struct ifreq ifr;

1300

1238

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

1308

1246

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

1309

1247

}

1310

1248

1311

__attribute__((nonnull, pure, warn_unused_result))

1312

1249

int notdotentries(const struct dirent *direntry){

1313

1250

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

1314

1251

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

1321

1258

}

1322

1259

1323

1260

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

1324

__attribute__((nonnull, warn_unused_result))

1325

1261

int runnable_hook(const struct dirent *direntry){

1326

1262

int ret;

1327

1263

size_t sret;

1382

1318

return 1;

1383

1319

}

1384

1320

1385

__attribute__((nonnull, warn_unused_result))

1386

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1387

mandos_context *mc){

1321

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1388

1322

int ret;

1389

1323

struct timespec now;

1390

1324

struct timespec waited_time;

1391

1325

intmax_t block_time;

1392

1326

1393

1327

while(true){

1394

if(mc->current_server == NULL){

1395

if(debug){

1328

if(mc.current_server == NULL){

1329

if (debug){

1396

1330

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

1397

1331

" No timeout!\n");

1398

1332

}

1399

1333

ret = avahi_simple_poll_iterate(s, -1);

1400

1334

} else {

1401

if(debug){

1335

if (debug){

1402

1336

fprintf_plus(stderr, "Check current_server if we should run"

1403

1337

" it, or wait\n");

1404

1338

}

1411

1345

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

1412

1346

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

1413

1347

waited_time.tv_sec = (now.tv_sec

1414

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

1348

- mc.current_server->last_seen.tv_sec);

1415

1349

waited_time.tv_nsec = (now.tv_nsec

1416

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

1350

- mc.current_server->last_seen.tv_nsec);

1417

1351

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

1418

1352

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

1419

1353

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

1421

1355

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

1422

1356

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

1423

1357

1424

if(debug){

1358

if (debug){

1425

1359

fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",

1426

1360

block_time);

1427

1361

}

1428

1362

1429

1363

if(block_time <= 0){

1430

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

1431

mc->current_server->port,

1432

mc->current_server->if_index,

1433

mc->current_server->af, mc);

1364

ret = start_mandos_communication(mc.current_server->ip,

1365

mc.current_server->port,

1366

mc.current_server->if_index,

1367

mc.current_server->af);

1434

1368

if(ret == 0){

1435

avahi_simple_poll_quit(s);

1369

avahi_simple_poll_quit(mc.simple_poll);

1436

1370

return 0;

1437

1371

}

1438

1372

ret = clock_gettime(CLOCK_MONOTONIC,

1439

&mc->current_server->last_seen);

1373

&mc.current_server->last_seen);

1440

1374

if(ret == -1){

1441

1375

perror_plus("clock_gettime");

1442

1376

return -1;

1443

1377

}

1444

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

1378

mc.current_server = mc.current_server->next;

1445

1379

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

1446

1380

servers, but don't block */

1447

1381

}

1449

1383

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

1450

1384

}

1451

1385

if(ret != 0){

1452

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

1386

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

1453

1387

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

1454

1388

}

1455

1389

}

1457

1391

}

1458

1392

1459

1393

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

1460

__attribute__((warn_unused_result))

1461

1394

error_t raise_privileges(void){

1462

1395

error_t old_errno = errno;

1463

1396

error_t ret_errno = 0;

1470

1403

}

1471

1404

1472

1405

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

1473

__attribute__((warn_unused_result))

1474

1406

error_t raise_privileges_permanently(void){

1475

1407

error_t old_errno = errno;

1476

1408

error_t ret_errno = raise_privileges();

1487

1419

}

1488

1420

1489

1421

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

1490

__attribute__((warn_unused_result))

1491

1422

error_t lower_privileges(void){

1492

1423

error_t old_errno = errno;

1493

1424

error_t ret_errno = 0;

1500

1431

}

1501

1432

1502

1433

/* Lower privileges permanently */

1503

__attribute__((warn_unused_result))

1504

1434

error_t lower_privileges_permanently(void){

1505

1435

error_t old_errno = errno;

1506

1436

error_t ret_errno = 0;

1512

1442

return ret_errno;

1513

1443

}

1514

1444

1515

__attribute__((nonnull))

1516

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

1445

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

1517

1446

const float delay){

1518

1447

struct dirent **direntries;

1448

struct dirent *direntry;

1449

int ret;

1519

1450

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

1520

1451

alphasort);

1521

1452

if(numhooks == -1){

1522

if(errno == ENOENT){

1523

if(debug){

1524

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

1525

" found\n", hookdir);

1526

}

1527

} else {

1528

perror_plus("scandir");

1529

}

1453

perror_plus("scandir");

1530

1454

} else {

1531

struct dirent *direntry;

1532

int ret;

1533

1455

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

1534

1456

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

1535

1457

direntry = direntries[i];

1547

1469

if(hook_pid == 0){

1548

1470

/* Child */

1549

1471

/* Raise privileges */

1550

if(raise_privileges_permanently() != 0){

1551

perror_plus("Failed to raise privileges");

1552

_exit(EX_NOPERM);

1553

}

1472

raise_privileges_permanently();

1554

1473

/* Set group */

1555

1474

errno = 0;

1556

1475

ret = setgid(0);

1557

1476

if(ret == -1){

1558

1477

perror_plus("setgid");

1559

_exit(EX_NOPERM);

1560

1478

}

1561

1479

/* Reset supplementary groups */

1562

1480

errno = 0;

1563

1481

ret = setgroups(0, NULL);

1564

1482

if(ret == -1){

1565

1483

perror_plus("setgroups");

1566

_exit(EX_NOPERM);

1567

}

1568

ret = dup2(devnull, STDIN_FILENO);

1569

if(ret == -1){

1570

perror_plus("dup2(devnull, STDIN_FILENO)");

1571

_exit(EX_OSERR);

1572

}

1573

ret = close(devnull);

1574

if(ret == -1){

1575

perror_plus("close");

1576

_exit(EX_OSERR);

1577

}

1578

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1579

if(ret == -1){

1580

perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");

1581

_exit(EX_OSERR);

1582

}

1484

}

1485

dup2(devnull, STDIN_FILENO);

1486

close(devnull);

1487

dup2(STDERR_FILENO, STDOUT_FILENO);

1583

1488

ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);

1584

1489

if(ret == -1){

1585

1490

perror_plus("setenv");

1601

1506

_exit(EX_OSERR);

1602

1507

}

1603

1508

char *delaystring;

1604

ret = asprintf(&delaystring, "%f", (double)delay);

1509

ret = asprintf(&delaystring, "%f", delay);

1605

1510

if(ret == -1){

1606

1511

perror_plus("asprintf");

1607

1512

_exit(EX_OSERR);

1660

1565

}

1661

1566

close(devnull);

1662

1567

}

1568

return true;

1663

1569

}

1664

1570

1665

__attribute__((nonnull, warn_unused_result))

1666

1571

error_t bring_up_interface(const char *const interface,

1667

1572

const float delay){

1573

int sd = -1;

1668

1574

error_t old_errno = errno;

1669

int ret;

1575

error_t ret_errno = 0;

1576

int ret, ret_setflags;

1670

1577

struct ifreq network;

1671

1578

unsigned int if_index = if_nametoindex(interface);

1672

1579

if(if_index == 0){

1681

1588

}

1682

1589

1683

1590

if(not interface_is_up(interface)){

1684

error_t ret_errno = 0, ioctl_errno = 0;

1685

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

1591

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

1686

1592

ret_errno = errno;

1687

1593

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

1688

1594

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

1689

errno = old_errno;

1690

1595

return ret_errno;

1691

1596

}

1692

network.ifr_flags |= IFF_UP; /* set flag */

1597

network.ifr_flags |= IFF_UP;

1693

1598

1694

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

1695

if(sd == -1){

1599

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1600

if(sd < 0){

1696

1601

ret_errno = errno;

1697

1602

perror_plus("socket");

1698

1603

errno = old_errno;

1699

1604

return ret_errno;

1700

1605

}

1701

1606

1702

1607

if(quit_now){

1703

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

1704

if(ret == -1){

1705

perror_plus("close");

1706

}

1608

close(sd);

1707

1609

errno = old_errno;

1708

1610

return EINTR;

1709

1611

}

1713

1615

interface);

1714

1616

}

1715

1617

1716

/* Raise privileges */

1717

ret_errno = raise_privileges();

1718

bool restore_loglevel = false;

1719

if(ret_errno != 0){

1720

perror_plus("Failed to raise privileges");

1721

}

1618

/* Raise priviliges */

1619

raise_privileges();

1620

1722

1621

#ifdef __linux__

1723

int ret_linux;

1724

if(ret_errno == 0){

1725

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1726

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

1727

ret_linux = klogctl(8, NULL, 5);

1728

if(ret_linux == -1){

1729

perror_plus("klogctl");

1730

} else {

1731

restore_loglevel = true;

1732

}

1622

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1623

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

1624

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

1625

bool restore_loglevel = true;

1626

if(ret_linux == -1){

1627

restore_loglevel = false;

1628

perror_plus("klogctl");

1733

1629

}

1734

1630

#endif /* __linux__ */

1735

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

1736

ioctl_errno = errno;

1631

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

1632

ret_errno = errno;

1737

1633

#ifdef __linux__

1738

1634

if(restore_loglevel){

1739

1635

ret_linux = klogctl(7, NULL, 0);

1743

1639

}

1744

1640

#endif /* __linux__ */

1745

1641

1746

/* If raise_privileges() succeeded above */

1747

if(ret_errno == 0){

1748

/* Lower privileges */

1749

ret_errno = lower_privileges();

1750

if(ret_errno != 0){

1751

errno = ret_errno;

1752

perror_plus("Failed to lower privileges");

1753

}

1754

}

1642

/* Lower privileges */

1643

lower_privileges();

1755

1644

1756

1645

/* Close the socket */

1757

1646

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

1760

1649

}

1761

1650

1762

1651

if(ret_setflags == -1){

1763

errno = ioctl_errno;

1652

errno = ret_errno;

1764

1653

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1765

1654

errno = old_errno;

1766

return ioctl_errno;

1655

return ret_errno;

1767

1656

}

1768

1657

} else if(debug){

1769

1658

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

1787

1676

return 0;

1788

1677

}

1789

1678

1790

__attribute__((nonnull, warn_unused_result))

1791

1679

error_t take_down_interface(const char *const interface){

1680

int sd = -1;

1792

1681

error_t old_errno = errno;

1682

error_t ret_errno = 0;

1683

int ret, ret_setflags;

1793

1684

struct ifreq network;

1794

1685

unsigned int if_index = if_nametoindex(interface);

1795

1686

if(if_index == 0){

1798

1689

return ENXIO;

1799

1690

}

1800

1691

if(interface_is_up(interface)){

1801

error_t ret_errno = 0, ioctl_errno = 0;

1802

1692

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

1803

1693

ret_errno = errno;

1804

1694

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

1805

1695

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

1806

errno = old_errno;

1807

1696

return ret_errno;

1808

1697

}

1809

1698

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

1810

1699

1811

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

1812

if(sd == -1){

1700

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1701

if(sd < 0){

1813

1702

ret_errno = errno;

1814

1703

perror_plus("socket");

1815

1704

errno = old_errno;

1821

1710

interface);

1822

1711

}

1823

1712

1824

/* Raise privileges */

1825

ret_errno = raise_privileges();

1826

if(ret_errno != 0){

1827

perror_plus("Failed to raise privileges");

1828

}

1829

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

1830

ioctl_errno = errno;

1831

1832

/* If raise_privileges() succeeded above */

1833

if(ret_errno == 0){

1834

/* Lower privileges */

1835

ret_errno = lower_privileges();

1836

if(ret_errno != 0){

1837

errno = ret_errno;

1838

perror_plus("Failed to lower privileges");

1839

}

1840

}

1713

/* Raise priviliges */

1714

raise_privileges();

1715

1716

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

1717

ret_errno = errno;

1718

1719

/* Lower privileges */

1720

lower_privileges();

1841

1721

1842

1722

/* Close the socket */

1843

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

1723

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

1844

1724

if(ret == -1){

1845

1725

perror_plus("close");

1846

1726

}

1847

1727

1848

1728

if(ret_setflags == -1){

1849

errno = ioctl_errno;

1729

errno = ret_errno;

1850

1730

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1851

1731

errno = old_errno;

1852

return ioctl_errno;

1732

return ret_errno;

1853

1733

}

1854

1734

} else if(debug){

1855

1735

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

1861

1741

}

1862

1742

1863

1743

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

1864

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

1865

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

1866

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

1867

.interfaces = NULL, .interfaces_size = 0 };

1868

1744

AvahiSServiceBrowser *sb = NULL;

1869

1745

error_t ret_errno;

1870

1746

int ret;

1871

1747

intmax_t tmpmax;

1872

1748

char *tmp;

1873

1749

int exitcode = EXIT_SUCCESS;

1750

char *interfaces = NULL;

1751

size_t interfaces_size = 0;

1874

1752

char *interfaces_to_take_down = NULL;

1875

1753

size_t interfaces_to_take_down_size = 0;

1876

char run_tempdir[] = "/run/tmp/mandosXXXXXX";

1877

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

1878

char *tempdir = NULL;

1754

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

1755

bool tempdir_created = false;

1879

1756

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1880

1757

const char *seckey = PATHDIR "/" SECKEY;

1881

1758

const char *pubkey = PATHDIR "/" PUBKEY;

1882

1759

char *interfaces_hooks = NULL;

1760

size_t interfaces_hooks_size = 0;

1883

1761

1884

1762

bool gnutls_initialized = false;

1885

1763

bool gpgme_initialized = false;

1976

1854

connect_to = arg;

1977

1855

break;

1978

1856

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

1979

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

1980

arg, (int)',');

1857

ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,

1858

(int)',');

1981

1859

if(ret_errno != 0){

1982

1860

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

1983

1861

}

2063

1941

/* Work around Debian bug #633582:

2064

1942

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

2065

1943

2066

/* Re-raise privileges */

2067

ret_errno = raise_privileges();

2068

if(ret_errno != 0){

2069

errno = ret_errno;

2070

perror_plus("Failed to raise privileges");

2071

} else {

1944

/* Re-raise priviliges */

1945

if(raise_privileges() == 0){

2072

1946

struct stat st;

2073

1947

2074

1948

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

2114

1988

}

2115

1989

2116

1990

/* Lower privileges */

2117

ret_errno = lower_privileges();

2118

if(ret_errno != 0){

2119

errno = ret_errno;

2120

perror_plus("Failed to lower privileges");

1991

errno = 0;

1992

ret = seteuid(uid);

1993

if(ret == -1){

1994

perror_plus("seteuid");

2121

1995

}

2122

1996

}

2123

1997

}

2124

1998

2125

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

1999

/* Remove empty interface names */

2126

2000

{

2127

2001

char *interface = NULL;

2128

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

2002

while((interface = argz_next(interfaces, interfaces_size,

2129

2003

interface))){

2130

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

2131

and if_nametoindex(interface) == 0){

2132

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

2004

if(if_nametoindex(interface) == 0){

2005

if(interface[0] != '\0' and strcmp(interface, "none") != 0){

2133

2006

fprintf_plus(stderr, "Not using nonexisting interface"

2134

2007

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

2135

2008

}

2136

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

2009

argz_delete(&interfaces, &interfaces_size, interface);

2137

2010

interface = NULL;

2138

2011

}

2139

2012

}

2141

2014

2142

2015

/* Run network hooks */

2143

2016

{

2144

if(mc.interfaces != NULL){

2145

interfaces_hooks = malloc(mc.interfaces_size);

2146

if(interfaces_hooks == NULL){

2147

perror_plus("malloc");

2148

goto end;

2149

}

2150

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

2151

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

2152

}

2153

run_network_hooks("start", interfaces_hooks != NULL ?

2154

interfaces_hooks : "", delay);

2017

ret_errno = argz_append(&interfaces_hooks, &interfaces_hooks_size,

2018

interfaces, interfaces_size);

2019

if(ret_errno != 0){

2020

errno = ret_errno;

2021

perror_plus("argz_append");

2022

goto end;

2023

}

2024

argz_stringify(interfaces_hooks, interfaces_hooks_size, (int)',');

2025

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

2026

goto end;

2027

}

2155

2028

}

2156

2029

2157

2030

if(not debug){

2162

2035

from the signal handler */

2163

2036

/* Initialize the pseudo-RNG for Avahi */

2164

2037

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

2165

simple_poll = avahi_simple_poll_new();

2166

if(simple_poll == NULL){

2038

mc.simple_poll = avahi_simple_poll_new();

2039

if(mc.simple_poll == NULL){

2167

2040

fprintf_plus(stderr,

2168

2041

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

2169

2042

exitcode = EX_UNAVAILABLE;

2234

2107

}

2235

2108

2236

2109

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

2237

if(mc.interfaces == NULL){

2110

if(interfaces == NULL){

2238

2111

struct dirent **direntries;

2239

2112

/* Look for any good interfaces */

2240

2113

ret = scandir(sys_class_net, &direntries, good_interface,

2242

2115

if(ret >= 1){

2243

2116

/* Add all found interfaces to interfaces list */

2244

2117

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

2245

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

2118

ret_errno = argz_add(&interfaces, &interfaces_size,

2246

2119

direntries[i]->d_name);

2247

2120

if(ret_errno != 0){

2248

errno = ret_errno;

2249

2121

perror_plus("argz_add");

2250

2122

continue;

2251

2123

}

2263

2135

}

2264

2136

}

2265

2137

2266

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

2267

{

2138

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

2139

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

2140

if(debug){

2141

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

2142

interfaces);

2143

}

2144

if_index = (AvahiIfIndex)if_nametoindex(interfaces);

2145

}

2146

2147

/* Bring up interfaces which are down */

2148

if(not (argz_count(interfaces, interfaces_size) == 1

2149

and strcmp(interfaces, "none") == 0)){

2268

2150

char *interface = NULL;

2269

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

2151

while((interface = argz_next(interfaces, interfaces_size,

2270

2152

interface))){

2271

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

2272

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

2273

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

2274

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

2275

interface);

2276

interface = NULL;

2277

while((interface = argz_next(mc.interfaces,

2278

mc.interfaces_size, interface))){

2279

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

2280

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

2281

interface);

2282

interface = NULL;

2283

}

2284

}

2285

break;

2286

}

2287

2153

bool interface_was_up = interface_is_up(interface);

2288

errno = bring_up_interface(interface, delay);

2154

ret = bring_up_interface(interface, delay);

2289

2155

if(not interface_was_up){

2290

if(errno != 0){

2156

if(ret != 0){

2157

errno = ret;

2291

2158

perror_plus("Failed to bring up interface");

2292

2159

} else {

2293

errno = argz_add(&interfaces_to_take_down,

2294

&interfaces_to_take_down_size,

2295

interface);

2296

if(errno != 0){

2297

perror_plus("argz_add");

2298

}

2160

ret_errno = argz_add(&interfaces_to_take_down,

2161

&interfaces_to_take_down_size,

2162

interface);

2299

2163

}

2300

2164

}

2301

2165

}

2166

free(interfaces);

2167

interfaces = NULL;

2168

interfaces_size = 0;

2302

2169

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

2303

2170

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

2304

2171

}

2305

2172

}

2306

2173

2307

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

2308

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

2309

if(debug){

2310

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

2311

mc.interfaces);

2312

}

2313

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

2314

}

2315

2316

2174

if(quit_now){

2317

2175

goto end;

2318

2176

}

2319

2177

2320

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

2178

ret = init_gnutls_global(pubkey, seckey);

2321

2179

if(ret == -1){

2322

2180

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

2323

2181

exitcode = EX_UNAVAILABLE;

2330

2188

goto end;

2331

2189

}

2332

2190

2333

/* Try /run/tmp before /tmp */

2334

tempdir = mkdtemp(run_tempdir);

2335

if(tempdir == NULL and errno == ENOENT){

2336

if(debug){

2337

fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",

2338

run_tempdir, old_tempdir);

2339

}

2340

tempdir = mkdtemp(old_tempdir);

2341

}

2342

if(tempdir == NULL){

2191

if(mkdtemp(tempdir) == NULL){

2343

2192

perror_plus("mkdtemp");

2344

2193

goto end;

2345

2194

}

2195

tempdir_created = true;

2346

2196

2347

2197

if(quit_now){

2348

2198

goto end;

2349

2199

}

2350

2200

2351

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

2201

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

2352

2202

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

2353

2203

exitcode = EX_UNAVAILABLE;

2354

2204

goto end;

2375

2225

goto end;

2376

2226

}

2377

2227

2378

in_port_t port;

2228

uint16_t port;

2379

2229

errno = 0;

2380

2230

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

2381

2231

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

2382

or tmpmax != (in_port_t)tmpmax){

2232

or tmpmax != (uint16_t)tmpmax){

2383

2233

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

2384

2234

exitcode = EX_USAGE;

2385

2235

goto end;

2386

2236

}

2387

2237

2388

2238

if(quit_now){

2389

2239

goto end;

2390

2240

}

2391

2241

2392

port = (in_port_t)tmpmax;

2242

port = (uint16_t)tmpmax;

2393

2243

*address = '\0';

2394

2244

/* Colon in address indicates IPv6 */

2395

2245

int af;

2411

2261

}

2412

2262

2413

2263

while(not quit_now){

2414

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

2415

&mc);

2264

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

2416

2265

if(quit_now or ret == 0){

2417

2266

break;

2418

2267

}

2420

2269

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

2421

2270

(int)retry_interval);

2422

2271

}

2423

sleep((unsigned int)retry_interval);

2272

sleep((int)retry_interval);

2424

2273

}

2425

2274

2426

if(not quit_now){

2275

if (not quit_now){

2427

2276

exitcode = EXIT_SUCCESS;

2428

2277

}

2429

2278

2444

2293

config.publish_domain = 0;

2445

2294

2446

2295

/* Allocate a new server */

2447

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2448

&config, NULL, NULL, &ret_errno);

2296

mc.server = avahi_server_new(avahi_simple_poll_get

2297

(mc.simple_poll), &config, NULL,

2298

NULL, &ret_errno);

2449

2299

2450

2300

/* Free the Avahi configuration data */

2451

2301

avahi_server_config_free(&config);

2466

2316

/* Create the Avahi service browser */

2467

2317

sb = avahi_s_service_browser_new(mc.server, if_index,

2468

2318

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2469

NULL, 0, browse_callback,

2470

(void *)&mc);

2319

NULL, 0, browse_callback, NULL);

2471

2320

if(sb == NULL){

2472

2321

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

2473

2322

avahi_strerror(avahi_server_errno(mc.server)));

2485

2334

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

2486

2335

}

2487

2336

2488

ret = avahi_loop_with_timeout(simple_poll,

2489

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

2337

ret = avahi_loop_with_timeout(mc.simple_poll,

2338

(int)(retry_interval * 1000));

2490

2339

if(debug){

2491

2340

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

2492

2341

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

2499

2348

}

2500

2349

2501

2350

/* Cleanup things */

2502

free(mc.interfaces);

2503

2504

2351

if(sb != NULL)

2505

2352

avahi_s_service_browser_free(sb);

2506

2353

2507

2354

if(mc.server != NULL)

2508

2355

avahi_server_free(mc.server);

2509

2356

2510

if(simple_poll != NULL)

2511

avahi_simple_poll_free(simple_poll);

2357

if(mc.simple_poll != NULL)

2358

avahi_simple_poll_free(mc.simple_poll);

2512

2359

2513

2360

if(gnutls_initialized){

2514

2361

gnutls_certificate_free_credentials(mc.cred);

2531

2378

}

2532

2379

}

2533

2380

2534

/* Re-raise privileges */

2381

/* Re-raise priviliges */

2535

2382

{

2536

ret_errno = raise_privileges();

2537

if(ret_errno != 0){

2538

perror_plus("Failed to raise privileges");

2539

} else {

2540

2541

/* Run network hooks */

2542

run_network_hooks("stop", interfaces_hooks != NULL ?

2543

interfaces_hooks : "", delay);

2544

2545

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

2546

{

2547

char *interface = NULL;

2548

while((interface=argz_next(interfaces_to_take_down,

2549

interfaces_to_take_down_size,

2550

interface))){

2551

ret_errno = take_down_interface(interface);

2552

if(ret_errno != 0){

2553

errno = ret_errno;

2554

perror_plus("Failed to take down interface");

2555

}

2556

}

2557

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

2558

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

2559

" down\n");

2560

}

2561

}

2562

}

2563

ret_errno = lower_privileges_permanently();

2564

if(ret_errno != 0){

2565

perror_plus("Failed to lower privileges permanently");

2566

}

2383

raise_privileges();

2384

2385

/* Run network hooks */

2386

run_network_hooks("stop", interfaces_hooks, delay);

2387

2388

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

2389

{

2390

char *interface = NULL;

2391

while((interface=argz_next(interfaces_to_take_down,

2392

interfaces_to_take_down_size,

2393

interface))){

2394

ret_errno = take_down_interface(interface);

2395

if(ret_errno != 0){

2396

errno = ret_errno;

2397

perror_plus("Failed to take down interface");

2398

}

2399

}

2400

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

2401

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

2402

" down\n");

2403

}

2404

}

2405

2406

lower_privileges_permanently();

2567

2407

}

2568

2408

2569

2409

free(interfaces_to_take_down);

2570

2410

free(interfaces_hooks);

2571

2411

2572

2412

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

2573

if(tempdir != NULL){

2413

if(tempdir_created){

2574

2414

struct dirent **direntries = NULL;

2575

2415

struct dirent *direntry = NULL;

2576

2416

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

2577

2417

alphasort);

2578

if(numentries > 0){

2418

if (numentries > 0){

2579

2419

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

2580

2420

direntry = direntries[i];

2581

2421

char *fullname = NULL;

2596

2436

2597

2437

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

2598

2438

free(direntries);

2599

if(numentries == -1){

2439

if (numentries == -1){

2600

2440

perror_plus("scandir");

2601

2441

}

2602

2442

ret = rmdir(tempdir);