/mandos/trunk : revision 671

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 */

44

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

58

inet_pton(), connect(),

59

getnameinfo() */

59

60

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

60

61

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

61

62

*/

62

63

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

63

64

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, inet_ntop() */

77

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

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() */

91

97

92

98

#ifdef __linux__

93

99

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

135

141

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

136

142

char *connect_to = NULL;

137

143

const char *hookdir = HOOKDIR;

144

uid_t uid = 65534;

145

gid_t gid = 65534;

138

146

139

147

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

140

148

typedef struct server{

141

149

const char *ip;

142

uint16_t port;

150

in_port_t port;

143

151

AvahiIfIndex if_index;

144

152

int af;

145

153

struct timespec last_seen;

149

157

150

158

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

151

159

typedef struct {

152

AvahiSimplePoll *simple_poll;

153

160

AvahiServer *server;

154

161

gnutls_certificate_credentials_t cred;

155

162

unsigned int dh_bits;

157

164

const char *priority;

158

165

gpgme_ctx_t ctx;

159

166

server *current_server;

167

char *interfaces;

168

size_t interfaces_size;

160

169

} mandos_context;

161

170

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 };

171

/* global so signal handler can reach it*/

172

AvahiSimplePoll *simple_poll;

167

173

168

174

sig_atomic_t quit_now = 0;

169

175

int signal_received = 0;

170

176

171

177

/* Function to use when printing errors */

172

178

void perror_plus(const char *print_text){

179

int e = errno;

173

180

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

174

181

program_invocation_short_name);

182

errno = e;

175

183

perror(print_text);

176

184

}

177

185

186

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

178

187

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

179

188

va_list ap;

180

189

va_start (ap, format);

181

190

182

191

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

183

192

program_invocation_short_name));

184

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

193

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

185

194

}

186

195

187

196

/*

192

201

size_t incbuffer(char **buffer, size_t buffer_length,

193

202

size_t buffer_capacity){

194

203

if(buffer_length + BUFFER_SIZE > buffer_capacity){

195

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

196

if(buffer == NULL){

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;

197

210

return 0;

198

211

}

212

*buffer = new_buf;

199

213

buffer_capacity += BUFFER_SIZE;

200

214

}

201

215

return buffer_capacity;

202

216

}

203

217

204

218

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

205

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

206

int af){

219

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

220

int af, server **current_server){

207

221

int ret;

208

222

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

209

223

if(new_server == NULL){

210

224

perror_plus("malloc");

211

return -1;

225

return false;

212

226

}

213

227

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

214

228

.port = port,

216

230

.af = af };

217

231

if(new_server->ip == NULL){

218

232

perror_plus("strdup");

219

return -1;

233

return false;

234

}

235

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

236

if(ret == -1){

237

perror_plus("clock_gettime");

238

return false;

220

239

}

221

240

/* Special case of first server */

222

if (mc.current_server == NULL){

241

if(*current_server == NULL){

223

242

new_server->next = new_server;

224

243

new_server->prev = new_server;

225

mc.current_server = new_server;

244

*current_server = new_server;

226

245

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

227

246

} else {

228

new_server->next = mc.current_server;

229

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

247

new_server->next = *current_server;

248

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

230

249

new_server->prev->next = new_server;

231

mc.current_server->prev = new_server;

232

}

233

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

234

if(ret == -1){

235

perror_plus("clock_gettime");

236

return -1;

237

}

238

return 0;

250

(*current_server)->prev = new_server;

251

}

252

return true;

239

253

}

240

254

241

255

/*

242

256

* Initialize GPGME.

243

257

*/

244

258

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

245

const char *tempdir){

259

const char *tempdir, mandos_context *mc){

246

260

gpgme_error_t rc;

247

261

gpgme_engine_info_t engine_info;

248

262

249

250

263

/*

251

264

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

252

265

*/

268

281

return false;

269

282

}

270

283

271

rc = gpgme_op_import(mc.ctx, pgp_data);

284

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

272

285

if(rc != GPG_ERR_NO_ERROR){

273

286

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

274

287

gpgme_strsource(rc), gpgme_strerror(rc));

318

331

}

319

332

320

333

/* Create new GPGME "context" */

321

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

334

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

322

335

if(rc != GPG_ERR_NO_ERROR){

323

336

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

324

337

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

339

352

*/

340

353

static ssize_t pgp_packet_decrypt(const char *cryptotext,

341

354

size_t crypto_size,

342

char **plaintext){

355

char **plaintext,

356

mandos_context *mc){

343

357

gpgme_data_t dh_crypto, dh_plain;

344

358

gpgme_error_t rc;

345

359

ssize_t ret;

371

385

372

386

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

373

387

data buffer */

374

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

388

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

375

389

if(rc != GPG_ERR_NO_ERROR){

376

390

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

377

391

gpgme_strsource(rc), gpgme_strerror(rc));

378

392

plaintext_length = -1;

379

393

if(debug){

380

394

gpgme_decrypt_result_t result;

381

result = gpgme_op_decrypt_result(mc.ctx);

395

result = gpgme_op_decrypt_result(mc->ctx);

382

396

if(result == NULL){

383

397

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

384

398

} else {

462

476

}

463

477

464

478

static const char * safer_gnutls_strerror(int value){

465

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

466

-Wunreachable-code */

479

const char *ret = gnutls_strerror(value);

467

480

if(ret == NULL)

468

481

ret = "(unknown)";

469

482

return ret;

476

489

}

477

490

478

491

static int init_gnutls_global(const char *pubkeyfilename,

479

const char *seckeyfilename){

492

const char *seckeyfilename,

493

mandos_context *mc){

480

494

int ret;

481

495

482

496

if(debug){

499

513

}

500

514

501

515

/* OpenPGP credentials */

502

ret = gnutls_certificate_allocate_credentials(&mc.cred);

516

ret = gnutls_certificate_allocate_credentials(&mc->cred);

503

517

if(ret != GNUTLS_E_SUCCESS){

504

518

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

505

519

safer_gnutls_strerror(ret));

515

529

}

516

530

517

531

ret = gnutls_certificate_set_openpgp_key_file

518

(mc.cred, pubkeyfilename, seckeyfilename,

532

(mc->cred, pubkeyfilename, seckeyfilename,

519

533

GNUTLS_OPENPGP_FMT_BASE64);

520

534

if(ret != GNUTLS_E_SUCCESS){

521

535

fprintf_plus(stderr,

527

541

}

528

542

529

543

/* GnuTLS server initialization */

530

ret = gnutls_dh_params_init(&mc.dh_params);

544

ret = gnutls_dh_params_init(&mc->dh_params);

531

545

if(ret != GNUTLS_E_SUCCESS){

532

546

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

533

547

" initialization: %s\n",

534

548

safer_gnutls_strerror(ret));

535

549

goto globalfail;

536

550

}

537

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

551

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

538

552

if(ret != GNUTLS_E_SUCCESS){

539

553

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

540

554

safer_gnutls_strerror(ret));

541

555

goto globalfail;

542

556

}

543

557

544

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

558

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

545

559

546

560

return 0;

547

561

548

562

globalfail:

549

563

550

gnutls_certificate_free_credentials(mc.cred);

564

gnutls_certificate_free_credentials(mc->cred);

551

565

gnutls_global_deinit();

552

gnutls_dh_params_deinit(mc.dh_params);

566

gnutls_dh_params_deinit(mc->dh_params);

553

567

return -1;

554

568

}

555

569

556

static int init_gnutls_session(gnutls_session_t *session){

570

static int init_gnutls_session(gnutls_session_t *session,

571

mandos_context *mc){

557

572

int ret;

558

573

/* GnuTLS session creation */

559

574

do {

571

586

{

572

587

const char *err;

573

588

do {

574

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

589

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

575

590

if(quit_now){

576

591

gnutls_deinit(*session);

577

592

return -1;

588

603

589

604

do {

590

605

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

591

mc.cred);

606

mc->cred);

592

607

if(quit_now){

593

608

gnutls_deinit(*session);

594

609

return -1;

604

619

/* ignore client certificate if any. */

605

620

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

606

621

607

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

622

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

608

623

609

624

return 0;

610

625

}

614

629

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

615

630

616

631

/* Called when a Mandos server is found */

617

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

632

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

618

633

AvahiIfIndex if_index,

619

int af){

634

int af, mandos_context *mc){

620

635

int ret, tcp_sd = -1;

621

636

ssize_t sret;

622

union {

623

struct sockaddr_in in;

624

struct sockaddr_in6 in6;

625

} to;

637

struct sockaddr_storage to;

626

638

char *buffer = NULL;

627

639

char *decrypted_buffer = NULL;

628

640

size_t buffer_length = 0;

652

664

return -1;

653

665

}

654

666

655

ret = init_gnutls_session(&session);

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);

656

700

if(ret != 0){

657

701

return -1;

658

702

}

659

703

660

704

if(debug){

661

705

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

662

PRIu16 "\n", ip, port);

706

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

663

707

}

664

708

665

709

tcp_sd = socket(pf, SOCK_STREAM, 0);

677

721

678

722

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

679

723

if(af == AF_INET6){

680

to.in6.sin6_family = (sa_family_t)af;

681

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

724

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

725

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

682

726

} else { /* IPv4 */

683

to.in.sin_family = (sa_family_t)af;

684

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

727

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

728

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

685

729

}

686

730

if(ret < 0 ){

687

731

int e = errno;

696

740

goto mandos_end;

697

741

}

698

742

if(af == AF_INET6){

699

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

700

-Wconversion and

701

-Wunreachable-code */

702

703

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

704

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

705

-Wunreachable-code*/

743

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

744

if(IN6_IS_ADDR_LINKLOCAL

745

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

706

746

if(if_index == AVAHI_IF_UNSPEC){

707

747

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

708

748

" incomplete without a network interface\n");

710

750

goto mandos_end;

711

751

}

712

752

/* Set the network interface number as scope */

713

to.in6.sin6_scope_id = (uint32_t)if_index;

753

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

714

754

}

715

755

} else {

716

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

717

-Wconversion and

718

-Wunreachable-code */

756

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

719

757

}

720

758

721

759

if(quit_now){

729

767

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

730

768

perror_plus("if_indextoname");

731

769

} else {

732

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

733

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

770

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

771

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

734

772

}

735

773

} else {

736

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

737

ip, port);

774

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

775

ip, (uintmax_t)port);

738

776

}

739

777

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

740

778

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

741

const char *pcret;

742

779

if(af == AF_INET6){

743

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

744

sizeof(addrstr));

780

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

781

sizeof(struct sockaddr_in6),

782

addrstr, sizeof(addrstr), NULL, 0,

783

NI_NUMERICHOST);

745

784

} else {

746

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

747

sizeof(addrstr));

785

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

786

sizeof(struct sockaddr_in),

787

addrstr, sizeof(addrstr), NULL, 0,

788

NI_NUMERICHOST);

748

789

}

749

if(pcret == NULL){

750

perror_plus("inet_ntop");

751

} else {

752

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

753

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

754

}

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);

755

796

}

756

797

}

757

798

761

802

}

762

803

763

804

if(af == AF_INET6){

764

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

805

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

806

sizeof(struct sockaddr_in6));

765

807

} else {

766

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

808

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

809

sizeof(struct sockaddr_in));

767

810

}

768

811

if(ret < 0){

769

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

812

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

770

813

int e = errno;

771

814

perror_plus("connect");

772

815

errno = e;

818

861

goto mandos_end;

819

862

}

820

863

821

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

822

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

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);

823

869

824

870

if(quit_now){

825

871

errno = EINTR;

930

976

if(buffer_length > 0){

931

977

ssize_t decrypted_buffer_size;

932

978

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

933

&decrypted_buffer);

979

&decrypted_buffer, mc);

934

980

if(decrypted_buffer_size >= 0){

935

981

936

982

written = 0;

997

1043

AVAHI_GCC_UNUSED AvahiStringList *txt,

998

1044

AVAHI_GCC_UNUSED AvahiLookupResultFlags

999

1045

flags,

1000

AVAHI_GCC_UNUSED void* userdata){

1001

assert(r);

1046

void* mc){

1047

if(r == NULL){

1048

return;

1049

}

1002

1050

1003

1051

/* Called whenever a service has been resolved successfully or

1004

1052

timed out */

1013

1061

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

1014

1062

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

1015

1063

domain,

1016

avahi_strerror(avahi_server_errno(mc.server)));

1064

avahi_strerror(avahi_server_errno

1065

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

1017

1066

break;

1018

1067

1019

1068

case AVAHI_RESOLVER_FOUND:

1025

1074

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

1026

1075

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

1027

1076

}

1028

int ret = start_mandos_communication(ip, port, interface,

1029

avahi_proto_to_af(proto));

1077

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

1078

interface,

1079

avahi_proto_to_af(proto),

1080

mc);

1030

1081

if(ret == 0){

1031

avahi_simple_poll_quit(mc.simple_poll);

1082

avahi_simple_poll_quit(simple_poll);

1032

1083

} else {

1033

ret = add_server(ip, port, interface,

1034

avahi_proto_to_af(proto));

1084

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

1085

avahi_proto_to_af(proto),

1086

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

1087

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

1088

" list\n", name);

1089

}

1035

1090

}

1036

1091

}

1037

1092

}

1047

1102

const char *domain,

1048

1103

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1049

1104

flags,

1050

AVAHI_GCC_UNUSED void* userdata){

1051

assert(b);

1105

void* mc){

1106

if(b == NULL){

1107

return;

1108

}

1052

1109

1053

1110

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

1054

1111

is removed from the LAN */

1062

1119

case AVAHI_BROWSER_FAILURE:

1063

1120

1064

1121

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

1065

avahi_strerror(avahi_server_errno(mc.server)));

1066

avahi_simple_poll_quit(mc.simple_poll);

1122

avahi_strerror(avahi_server_errno

1123

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

1124

avahi_simple_poll_quit(simple_poll);

1067

1125

return;

1068

1126

1069

1127

case AVAHI_BROWSER_NEW:

1072

1130

the callback function is called the Avahi server will free the

1073

1131

resolver for us. */

1074

1132

1075

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

1076

name, type, domain, protocol, 0,

1077

resolve_callback, NULL) == NULL)

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)

1078

1137

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

1079

1138

" %s\n", name,

1080

avahi_strerror(avahi_server_errno(mc.server)));

1139

avahi_strerror(avahi_server_errno

1140

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

1081

1141

break;

1082

1142

1083

1143

case AVAHI_BROWSER_REMOVE:

1102

1162

signal_received = sig;

1103

1163

int old_errno = errno;

1104

1164

/* set main loop to exit */

1105

if(mc.simple_poll != NULL){

1106

avahi_simple_poll_quit(mc.simple_poll);

1165

if(simple_poll != NULL){

1166

avahi_simple_poll_quit(simple_poll);

1107

1167

}

1108

1168

errno = old_errno;

1109

1169

}

1110

1170

1111

1171

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

1112

1172

int ret;

1173

error_t ret_errno;

1113

1174

1114

1175

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

1115

1176

if(s < 0){

1177

ret_errno = errno;

1116

1178

perror_plus("socket");

1179

errno = ret_errno;

1117

1180

return false;

1118

1181

}

1119

1182

strcpy(ifr->ifr_name, ifname);

1120

1183

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1121

1184

if(ret == -1){

1122

1185

if(debug){

1186

ret_errno = errno;

1123

1187

perror_plus("ioctl SIOCGIFFLAGS");

1188

errno = ret_errno;

1124

1189

}

1125

1190

return false;

1126

1191

}

1195

1260

}

1196

1261

1197

1262

/*

1198

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

1199

* corresponds to an acceptable network device which is up.

1200

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

1201

*/

1202

int up_interface(const struct dirent *if_entry){

1203

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

1204

return 0;

1205

}

1206

1207

struct ifreq ifr;

1208

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

1209

if(debug){

1210

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

1211

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

1212

}

1213

return 0;

1214

}

1215

1216

/* Reject down interfaces */

1217

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

1218

if(debug){

1219

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

1220

if_entry->d_name);

1221

}

1222

return 0;

1223

}

1224

1225

/* Reject non-running interfaces */

1226

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

1227

if(debug){

1228

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

1229

if_entry->d_name);

1230

}

1231

return 0;

1232

}

1233

1234

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

1235

return 0;

1236

}

1237

return 1;

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);

1238

1292

}

1239

1293

1240

1294

int notdotentries(const struct dirent *direntry){

1309

1363

return 1;

1310

1364

}

1311

1365

1312

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1366

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1367

mandos_context *mc){

1313

1368

int ret;

1314

1369

struct timespec now;

1315

1370

struct timespec waited_time;

1316

1371

intmax_t block_time;

1317

1372

1318

1373

while(true){

1319

if(mc.current_server == NULL){

1320

if (debug){

1374

if(mc->current_server == NULL){

1375

if(debug){

1321

1376

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

1322

1377

" No timeout!\n");

1323

1378

}

1324

1379

ret = avahi_simple_poll_iterate(s, -1);

1325

1380

} else {

1326

if (debug){

1381

if(debug){

1327

1382

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

1328

1383

" it, or wait\n");

1329

1384

}

1336

1391

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

1337

1392

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

1338

1393

waited_time.tv_sec = (now.tv_sec

1339

- mc.current_server->last_seen.tv_sec);

1394

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

1340

1395

waited_time.tv_nsec = (now.tv_nsec

1341

- mc.current_server->last_seen.tv_nsec);

1396

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

1342

1397

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

1343

1398

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

1344

1399

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

1346

1401

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

1347

1402

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

1348

1403

1349

if (debug){

1404

if(debug){

1350

1405

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

1351

1406

block_time);

1352

1407

}

1353

1408

1354

1409

if(block_time <= 0){

1355

ret = start_mandos_communication(mc.current_server->ip,

1356

mc.current_server->port,

1357

mc.current_server->if_index,

1358

mc.current_server->af);

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);

1359

1414

if(ret == 0){

1360

avahi_simple_poll_quit(mc.simple_poll);

1415

avahi_simple_poll_quit(s);

1361

1416

return 0;

1362

1417

}

1363

1418

ret = clock_gettime(CLOCK_MONOTONIC,

1364

&mc.current_server->last_seen);

1419

&mc->current_server->last_seen);

1365

1420

if(ret == -1){

1366

1421

perror_plus("clock_gettime");

1367

1422

return -1;

1368

1423

}

1369

mc.current_server = mc.current_server->next;

1424

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

1370

1425

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

1371

1426

servers, but don't block */

1372

1427

}

1374

1429

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

1375

1430

}

1376

1431

if(ret != 0){

1377

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

1432

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

1378

1433

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

1379

1434

}

1380

1435

}

1381

1436

}

1382

1437

}

1383

1438

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

1384

1491

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

1385

1492

const float delay){

1386

1493

struct dirent **direntries;

1387

struct dirent *direntry;

1388

int ret;

1389

1494

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

1390

1495

alphasort);

1391

1496

if(numhooks == -1){

1392

perror_plus("scandir");

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

}

1393

1505

} else {

1506

struct dirent *direntry;

1507

int ret;

1394

1508

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

1395

1509

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

1396

1510

direntry = direntries[i];

1408

1522

if(hook_pid == 0){

1409

1523

/* Child */

1410

1524

/* Raise privileges */

1411

errno = 0;

1412

ret = seteuid(0);

1413

if(ret == -1){

1414

perror_plus("seteuid");

1415

}

1416

/* Raise privileges even more */

1417

errno = 0;

1418

ret = setuid(0);

1419

if(ret == -1){

1420

perror_plus("setuid");

1421

}

1525

raise_privileges_permanently();

1422

1526

/* Set group */

1423

1527

errno = 0;

1424

1528

ret = setgid(0);

1444

1548

perror_plus("setenv");

1445

1549

_exit(EX_OSERR);

1446

1550

}

1447

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

1551

ret = setenv("VERBOSITY", debug ? "1" : "0", 1);

1448

1552

if(ret == -1){

1449

1553

perror_plus("setenv");

1450

1554

_exit(EX_OSERR);

1467

1571

_exit(EX_OSERR);

1468

1572

}

1469

1573

free(delaystring);

1470

ret = execl(fullname, direntry->d_name, mode, NULL);

1471

perror_plus("execl");

1574

if(connect_to != NULL){

1575

ret = setenv("CONNECT", connect_to, 1);

1576

if(ret == -1){

1577

perror_plus("setenv");

1578

_exit(EX_OSERR);

1579

}

1580

}

1581

if(execl(fullname, direntry->d_name, mode, NULL) == -1){

1582

perror_plus("execl");

1583

_exit(EXIT_FAILURE);

1584

}

1472

1585

} else {

1473

1586

int status;

1474

1587

if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){

1508

1621

return true;

1509

1622

}

1510

1623

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

1511

1794

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 };

1512

1799

AvahiSServiceBrowser *sb = NULL;

1513

int error;

1800

error_t ret_errno;

1514

1801

int ret;

1515

1802

intmax_t tmpmax;

1516

1803

char *tmp;

1517

1804

int exitcode = EXIT_SUCCESS;

1518

const char *interface = "";

1519

struct ifreq network;

1520

int sd = -1;

1521

bool take_down_interface = false;

1522

uid_t uid;

1523

gid_t gid;

1805

char *interfaces_to_take_down = NULL;

1806

size_t interfaces_to_take_down_size = 0;

1524

1807

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

1525

1808

bool tempdir_created = false;

1526

1809

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1527

1810

const char *seckey = PATHDIR "/" SECKEY;

1528

1811

const char *pubkey = PATHDIR "/" PUBKEY;

1812

char *interfaces_hooks = NULL;

1529

1813

1530

1814

bool gnutls_initialized = false;

1531

1815

bool gpgme_initialized = false;

1593

1877

.group = 2 },

1594

1878

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

1595

1879

.arg = "SECONDS",

1596

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

1880

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

1597

1881

.group = 2 },

1598

1882

{ .name = "network-hook-dir", .key = 133,

1599

1883

.arg = "DIR",

1622

1906

connect_to = arg;

1623

1907

break;

1624

1908

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

1625

interface = arg;

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

}

1626

1914

break;

1627

1915

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

1628

1916

seckey = arg;

1671

1959

argp_state_help(state, state->out_stream,

1672

1960

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1673

1961

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

1674

fprintf_plus(state->out_stream,

1675

"Mandos plugin mandos-client: ");

1676

1962

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

1677

1963

exit(argp_err_exit_status);

1678

1964

break;

1708

1994

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

1709

1995

1710

1996

/* Re-raise priviliges */

1711

errno = 0;

1712

ret = seteuid(0);

1713

if(ret == -1){

1714

perror_plus("seteuid");

1715

} else {

1997

if(raise_privileges() == 0){

1716

1998

struct stat st;

1717

1999

1718

2000

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

1758

2040

}

1759

2041

1760

2042

/* Lower privileges */

1761

errno = 0;

1762

ret = seteuid(uid);

1763

if(ret == -1){

1764

perror_plus("seteuid");

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;

1765

2060

}

1766

2061

}

1767

2062

}

1768

2063

1769

2064

/* Run network hooks */

1770

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

1771

goto end;

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

}

1772

2079

}

1773

2080

1774

2081

if(not debug){

1775

2082

avahi_set_log_function(empty_log);

1776

2083

}

1777

2084

1778

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

1779

struct dirent **direntries;

1780

/* First look for interfaces that are up */

1781

ret = scandir(sys_class_net, &direntries, up_interface,

1782

alphasort);

1783

if(ret == 0){

1784

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

1785

free(direntries);

1786

ret = scandir(sys_class_net, &direntries, good_interface,

1787

alphasort);

1788

}

1789

if(ret >= 1){

1790

/* Pick the first interface returned */

1791

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

1792

if(debug){

1793

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

1794

}

1795

if(interface == NULL){

1796

perror_plus("malloc");

1797

free(direntries);

1798

exitcode = EXIT_FAILURE;

1799

goto end;

1800

}

1801

free(direntries);

1802

} else {

1803

free(direntries);

1804

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

1805

exitcode = EXIT_FAILURE;

1806

goto end;

1807

}

1808

}

1809

1810

2085

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

1811

2086

from the signal handler */

1812

2087

/* Initialize the pseudo-RNG for Avahi */

1813

2088

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

1814

mc.simple_poll = avahi_simple_poll_new();

1815

if(mc.simple_poll == NULL){

2089

simple_poll = avahi_simple_poll_new();

2090

if(simple_poll == NULL){

1816

2091

fprintf_plus(stderr,

1817

2092

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

1818

2093

exitcode = EX_UNAVAILABLE;

1882

2157

}

1883

2158

}

1884

2159

1885

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

1886

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

1887

if_index = (AvahiIfIndex) if_nametoindex(interface);

1888

if(if_index == 0){

1889

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

1890

exitcode = EX_UNAVAILABLE;

1891

goto end;

1892

}

1893

1894

if(quit_now){

1895

goto end;

1896

}

1897

1898

/* Re-raise priviliges */

1899

errno = 0;

1900

ret = seteuid(0);

1901

if(ret == -1){

1902

perror_plus("seteuid");

1903

}

1904

1905

#ifdef __linux__

1906

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1907

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

1908

ret = klogctl(8, NULL, 5);

1909

bool restore_loglevel = true;

1910

if(ret == -1){

1911

restore_loglevel = false;

1912

perror_plus("klogctl");

1913

}

1914

#endif /* __linux__ */

1915

1916

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1917

if(sd < 0){

1918

perror_plus("socket");

1919

exitcode = EX_OSERR;

1920

#ifdef __linux__

1921

if(restore_loglevel){

1922

ret = klogctl(7, NULL, 0);

1923

if(ret == -1){

1924

perror_plus("klogctl");

1925

}

1926

}

1927

#endif /* __linux__ */

1928

/* Lower privileges */

1929

errno = 0;

1930

ret = seteuid(uid);

1931

if(ret == -1){

1932

perror_plus("seteuid");

1933

}

1934

goto end;

1935

}

1936

strcpy(network.ifr_name, interface);

1937

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

1938

if(ret == -1){

1939

perror_plus("ioctl SIOCGIFFLAGS");

1940

#ifdef __linux__

1941

if(restore_loglevel){

1942

ret = klogctl(7, NULL, 0);

1943

if(ret == -1){

1944

perror_plus("klogctl");

1945

}

1946

}

1947

#endif /* __linux__ */

1948

exitcode = EX_OSERR;

1949

/* Lower privileges */

1950

errno = 0;

1951

ret = seteuid(uid);

1952

if(ret == -1){

1953

perror_plus("seteuid");

1954

}

1955

goto end;

1956

}

1957

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

1958

network.ifr_flags |= IFF_UP;

1959

take_down_interface = true;

1960

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

1961

if(ret == -1){

1962

take_down_interface = false;

1963

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1964

exitcode = EX_OSERR;

1965

#ifdef __linux__

1966

if(restore_loglevel){

1967

ret = klogctl(7, NULL, 0);

1968

if(ret == -1){

1969

perror_plus("klogctl");

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;

1970

2207

}

1971

2208

}

1972

#endif /* __linux__ */

1973

/* Lower privileges */

1974

errno = 0;

1975

ret = seteuid(uid);

1976

if(ret == -1){

1977

perror_plus("seteuid");

1978

}

1979

goto end;

1980

}

1981

}

1982

/* Sleep checking until interface is running.

1983

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

1984

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

1985

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

1986

if(ret == -1){

1987

perror_plus("ioctl SIOCGIFFLAGS");

1988

} else if(network.ifr_flags & IFF_RUNNING){

1989

2209

break;

1990

2210

}

1991

struct timespec sleeptime = { .tv_nsec = 250000000 };

1992

ret = nanosleep(&sleeptime, NULL);

1993

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

1994

perror_plus("nanosleep");

1995

}

1996

}

1997

if(not take_down_interface){

1998

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

1999

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

2000

if(ret == -1){

2001

perror_plus("close");

2002

}

2003

}

2004

#ifdef __linux__

2005

if(restore_loglevel){

2006

/* Restores kernel loglevel to default */

2007

ret = klogctl(7, NULL, 0);

2008

if(ret == -1){

2009

perror_plus("klogctl");

2010

}

2011

}

2012

#endif /* __linux__ */

2013

/* Lower privileges */

2014

errno = 0;

2015

/* Lower privileges */

2016

ret = seteuid(uid);

2017

if(ret == -1){

2018

perror_plus("seteuid");

2019

}

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);

2020

2240

}

2021

2241

2022

2242

if(quit_now){

2023

2243

goto end;

2024

2244

}

2025

2245

2026

ret = init_gnutls_global(pubkey, seckey);

2246

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

2027

2247

if(ret == -1){

2028

2248

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

2029

2249

exitcode = EX_UNAVAILABLE;

2046

2266

goto end;

2047

2267

}

2048

2268

2049

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

2269

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

2050

2270

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

2051

2271

exitcode = EX_UNAVAILABLE;

2052

2272

goto end;

2062

2282

/* Connect directly, do not use Zeroconf */

2063

2283

/* (Mainly meant for debugging) */

2064

2284

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

2285

2065

2286

if(address == NULL){

2066

2287

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

2067

2288

exitcode = EX_USAGE;

2072

2293

goto end;

2073

2294

}

2074

2295

2075

uint16_t port;

2296

in_port_t port;

2076

2297

errno = 0;

2077

2298

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

2078

2299

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

2079

or tmpmax != (uint16_t)tmpmax){

2300

or tmpmax != (in_port_t)tmpmax){

2080

2301

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

2081

2302

exitcode = EX_USAGE;

2082

2303

goto end;

2083

2304

}

2084

2305

2085

2306

if(quit_now){

2086

2307

goto end;

2087

2308

}

2088

2309

2089

port = (uint16_t)tmpmax;

2310

port = (in_port_t)tmpmax;

2090

2311

*address = '\0';

2091

2312

/* Colon in address indicates IPv6 */

2092

2313

int af;

2108

2329

}

2109

2330

2110

2331

while(not quit_now){

2111

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

2332

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

2333

&mc);

2112

2334

if(quit_now or ret == 0){

2113

2335

break;

2114

2336

}

2116

2338

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

2117

2339

(int)retry_interval);

2118

2340

}

2119

sleep((int)retry_interval);

2341

sleep((unsigned int)retry_interval);

2120

2342

}

2121

2343

2122

if (not quit_now){

2344

if(not quit_now){

2123

2345

exitcode = EXIT_SUCCESS;

2124

2346

}

2125

2347

2140

2362

config.publish_domain = 0;

2141

2363

2142

2364

/* Allocate a new server */

2143

mc.server = avahi_server_new(avahi_simple_poll_get

2144

(mc.simple_poll), &config, NULL,

2145

NULL, &error);

2365

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2366

&config, NULL, NULL, &ret_errno);

2146

2367

2147

2368

/* Free the Avahi configuration data */

2148

2369

avahi_server_config_free(&config);

2151

2372

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

2152

2373

if(mc.server == NULL){

2153

2374

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

2154

avahi_strerror(error));

2375

avahi_strerror(ret_errno));

2155

2376

exitcode = EX_UNAVAILABLE;

2156

2377

goto end;

2157

2378

}

2163

2384

/* Create the Avahi service browser */

2164

2385

sb = avahi_s_service_browser_new(mc.server, if_index,

2165

2386

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2166

NULL, 0, browse_callback, NULL);

2387

NULL, 0, browse_callback,

2388

(void *)&mc);

2167

2389

if(sb == NULL){

2168

2390

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

2169

2391

avahi_strerror(avahi_server_errno(mc.server)));

2181

2403

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

2182

2404

}

2183

2405

2184

ret = avahi_loop_with_timeout(mc.simple_poll,

2185

(int)(retry_interval * 1000));

2406

ret = avahi_loop_with_timeout(simple_poll,

2407

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

2186

2408

if(debug){

2187

2409

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

2188

2410

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

2195

2417

}

2196

2418

2197

2419

/* Cleanup things */

2420

free(mc.interfaces);

2421

2198

2422

if(sb != NULL)

2199

2423

avahi_s_service_browser_free(sb);

2200

2424

2201

2425

if(mc.server != NULL)

2202

2426

avahi_server_free(mc.server);

2203

2427

2204

if(mc.simple_poll != NULL)

2205

avahi_simple_poll_free(mc.simple_poll);

2428

if(simple_poll != NULL)

2429

avahi_simple_poll_free(simple_poll);

2206

2430

2207

2431

if(gnutls_initialized){

2208

2432

gnutls_certificate_free_credentials(mc.cred);

2225

2449

}

2226

2450

}

2227

2451

2228

/* Run network hooks */

2229

run_network_hooks("stop", interface, delay);

2230

2231

2452

/* Re-raise priviliges */

2232

2453

{

2233

errno = 0;

2234

ret = seteuid(0);

2235

if(ret == -1){

2236

perror_plus("seteuid");

2237

}

2238

2239

/* Take down the network interface */

2240

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

2241

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

2242

if(ret == -1){

2243

perror_plus("ioctl SIOCGIFFLAGS");

2244

} else if(network.ifr_flags & IFF_UP){

2245

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

2246

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

2247

if(ret == -1){

2248

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

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");

2249

2470

}

2250

2471

}

2251

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

2252

if(ret == -1){

2253

perror_plus("close");

2472

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

2473

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

2474

" down\n");

2254

2475

}

2255

2476

}

2256

}

2257

/* Lower privileges permanently */

2258

errno = 0;

2259

ret = setuid(uid);

2260

if(ret == -1){

2261

perror_plus("setuid");

2262

}

2477

2478

lower_privileges_permanently();

2479

}

2480

2481

free(interfaces_to_take_down);

2482

free(interfaces_hooks);

2263

2483

2264

2484

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

2265

2485

if(tempdir_created){

2267

2487

struct dirent *direntry = NULL;

2268

2488

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

2269

2489

alphasort);

2270

if (numentries > 0){

2490

if(numentries > 0){

2271

2491

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

2272

2492

direntry = direntries[i];

2273

2493

char *fullname = NULL;

2288

2508

2289

2509

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

2290

2510

free(direntries);

2291

if (numentries == -1){

2511

if(numentries == -1){

2292

2512

perror_plus("scandir");

2293

2513

}

2294

2514

ret = rmdir(tempdir);