/mandos/release : revision 237.7.219

9

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

10

*

11

* Everything else is

12

13

12

13

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*

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() */

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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,

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program_invocation_short_name */

67

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

74

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

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

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

77

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

77

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

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#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(),

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WEXITSTATUS(), WTERMSIG() */

90

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

91

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

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argz_delete(), argz_append(),

93

argz_stringify(), argz_add(),

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argz_count() */

95

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

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EAI_SYSTEM, gai_strerror() */

91

97

92

98

#ifdef __linux__

93

99

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

141

147

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

142

148

typedef struct server{

143

149

const char *ip;

144

uint16_t port;

150

in_port_t port;

145

151

AvahiIfIndex if_index;

146

152

int af;

147

153

struct timespec last_seen;

151

157

152

158

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

153

159

typedef struct {

154

AvahiSimplePoll *simple_poll;

155

160

AvahiServer *server;

156

161

gnutls_certificate_credentials_t cred;

157

162

unsigned int dh_bits;

159

164

const char *priority;

160

165

gpgme_ctx_t ctx;

161

166

server *current_server;

167

char *interfaces;

168

size_t interfaces_size;

162

169

} mandos_context;

163

170

164

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

165

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

166

.dh_bits = 1024, .priority = "SECURE256"

167

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

168

.current_server = NULL };

171

/* global so signal handler can reach it*/

172

AvahiSimplePoll *simple_poll;

169

173

170

174

sig_atomic_t quit_now = 0;

171

175

int signal_received = 0;

186

190

187

191

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

188

192

program_invocation_short_name));

189

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

193

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

190

194

}

191

195

192

196

/*

197

201

size_t incbuffer(char **buffer, size_t buffer_length,

198

202

size_t buffer_capacity){

199

203

if(buffer_length + BUFFER_SIZE > buffer_capacity){

200

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

201

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;

202

210

return 0;

203

211

}

212

*buffer = new_buf;

204

213

buffer_capacity += BUFFER_SIZE;

205

214

}

206

215

return buffer_capacity;

207

216

}

208

217

209

218

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

210

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

211

int af){

219

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

220

int af, server **current_server){

212

221

int ret;

213

222

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

214

223

if(new_server == NULL){

223

232

perror_plus("strdup");

224

233

return false;

225

234

}

235

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

236

if(ret == -1){

237

perror_plus("clock_gettime");

238

return false;

239

}

226

240

/* Special case of first server */

227

if (mc.current_server == NULL){

241

if(*current_server == NULL){

228

242

new_server->next = new_server;

229

243

new_server->prev = new_server;

230

mc.current_server = new_server;

244

*current_server = new_server;

231

245

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

232

246

} else {

233

new_server->next = mc.current_server;

234

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

247

new_server->next = *current_server;

248

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

235

249

new_server->prev->next = new_server;

236

mc.current_server->prev = new_server;

237

}

238

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

239

if(ret == -1){

240

perror_plus("clock_gettime");

241

return false;

250

(*current_server)->prev = new_server;

242

251

}

243

252

return true;

244

253

}

247

256

* Initialize GPGME.

248

257

*/

249

258

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

250

const char *tempdir){

259

const char *tempdir, mandos_context *mc){

251

260

gpgme_error_t rc;

252

261

gpgme_engine_info_t engine_info;

253

262

254

255

263

/*

256

264

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

257

265

*/

273

281

return false;

274

282

}

275

283

276

rc = gpgme_op_import(mc.ctx, pgp_data);

284

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

277

285

if(rc != GPG_ERR_NO_ERROR){

278

286

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

279

287

gpgme_strsource(rc), gpgme_strerror(rc));

323

331

}

324

332

325

333

/* Create new GPGME "context" */

326

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

334

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

327

335

if(rc != GPG_ERR_NO_ERROR){

328

336

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

329

337

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

344

352

*/

345

353

static ssize_t pgp_packet_decrypt(const char *cryptotext,

346

354

size_t crypto_size,

347

char **plaintext){

355

char **plaintext,

356

mandos_context *mc){

348

357

gpgme_data_t dh_crypto, dh_plain;

349

358

gpgme_error_t rc;

350

359

ssize_t ret;

376

385

377

386

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

378

387

data buffer */

379

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

388

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

380

389

if(rc != GPG_ERR_NO_ERROR){

381

390

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

382

391

gpgme_strsource(rc), gpgme_strerror(rc));

383

392

plaintext_length = -1;

384

393

if(debug){

385

394

gpgme_decrypt_result_t result;

386

result = gpgme_op_decrypt_result(mc.ctx);

395

result = gpgme_op_decrypt_result(mc->ctx);

387

396

if(result == NULL){

388

397

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

389

398

} else {

467

476

}

468

477

469

478

static const char * safer_gnutls_strerror(int value){

470

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

471

-Wunreachable-code */

479

const char *ret = gnutls_strerror(value);

472

480

if(ret == NULL)

473

481

ret = "(unknown)";

474

482

return ret;

481

489

}

482

490

483

491

static int init_gnutls_global(const char *pubkeyfilename,

484

const char *seckeyfilename){

492

const char *seckeyfilename,

493

mandos_context *mc){

485

494

int ret;

486

495

487

496

if(debug){

504

513

}

505

514

506

515

/* OpenPGP credentials */

507

ret = gnutls_certificate_allocate_credentials(&mc.cred);

516

ret = gnutls_certificate_allocate_credentials(&mc->cred);

508

517

if(ret != GNUTLS_E_SUCCESS){

509

518

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

510

519

safer_gnutls_strerror(ret));

520

529

}

521

530

522

531

ret = gnutls_certificate_set_openpgp_key_file

523

(mc.cred, pubkeyfilename, seckeyfilename,

532

(mc->cred, pubkeyfilename, seckeyfilename,

524

533

GNUTLS_OPENPGP_FMT_BASE64);

525

534

if(ret != GNUTLS_E_SUCCESS){

526

535

fprintf_plus(stderr,

532

541

}

533

542

534

543

/* GnuTLS server initialization */

535

ret = gnutls_dh_params_init(&mc.dh_params);

544

ret = gnutls_dh_params_init(&mc->dh_params);

536

545

if(ret != GNUTLS_E_SUCCESS){

537

546

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

538

547

" initialization: %s\n",

539

548

safer_gnutls_strerror(ret));

540

549

goto globalfail;

541

550

}

542

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

551

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

543

552

if(ret != GNUTLS_E_SUCCESS){

544

553

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

545

554

safer_gnutls_strerror(ret));

546

555

goto globalfail;

547

556

}

548

557

549

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

558

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

550

559

551

560

return 0;

552

561

553

562

globalfail:

554

563

555

gnutls_certificate_free_credentials(mc.cred);

564

gnutls_certificate_free_credentials(mc->cred);

556

565

gnutls_global_deinit();

557

gnutls_dh_params_deinit(mc.dh_params);

566

gnutls_dh_params_deinit(mc->dh_params);

558

567

return -1;

559

568

}

560

569

561

static int init_gnutls_session(gnutls_session_t *session){

570

static int init_gnutls_session(gnutls_session_t *session,

571

mandos_context *mc){

562

572

int ret;

563

573

/* GnuTLS session creation */

564

574

do {

576

586

{

577

587

const char *err;

578

588

do {

579

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

589

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

580

590

if(quit_now){

581

591

gnutls_deinit(*session);

582

592

return -1;

593

603

594

604

do {

595

605

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

596

mc.cred);

606

mc->cred);

597

607

if(quit_now){

598

608

gnutls_deinit(*session);

599

609

return -1;

609

619

/* ignore client certificate if any. */

610

620

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

611

621

612

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

622

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

613

623

614

624

return 0;

615

625

}

619

629

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

620

630

621

631

/* Called when a Mandos server is found */

622

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

632

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

623

633

AvahiIfIndex if_index,

624

int af){

634

int af, mandos_context *mc){

625

635

int ret, tcp_sd = -1;

626

636

ssize_t sret;

627

union {

628

struct sockaddr_in in;

629

struct sockaddr_in6 in6;

630

} to;

637

struct sockaddr_storage to;

631

638

char *buffer = NULL;

632

639

char *decrypted_buffer = NULL;

633

640

size_t buffer_length = 0;

657

664

return -1;

658

665

}

659

666

660

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);

661

700

if(ret != 0){

662

701

return -1;

663

702

}

664

703

665

704

if(debug){

666

705

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

667

PRIu16 "\n", ip, port);

706

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

668

707

}

669

708

670

709

tcp_sd = socket(pf, SOCK_STREAM, 0);

682

721

683

722

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

684

723

if(af == AF_INET6){

685

to.in6.sin6_family = (sa_family_t)af;

686

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);

687

726

} else { /* IPv4 */

688

to.in.sin_family = (sa_family_t)af;

689

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);

690

729

}

691

730

if(ret < 0 ){

692

731

int e = errno;

701

740

goto mandos_end;

702

741

}

703

742

if(af == AF_INET6){

704

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

705

-Wconversion and

706

-Wunreachable-code */

707

708

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

709

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

710

-Wunreachable-code*/

743

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

744

if(IN6_IS_ADDR_LINKLOCAL

745

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

711

746

if(if_index == AVAHI_IF_UNSPEC){

712

747

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

713

748

" incomplete without a network interface\n");

715

750

goto mandos_end;

716

751

}

717

752

/* Set the network interface number as scope */

718

to.in6.sin6_scope_id = (uint32_t)if_index;

753

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

719

754

}

720

755

} else {

721

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

722

-Wconversion and

723

-Wunreachable-code */

756

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

724

757

}

725

758

726

759

if(quit_now){

734

767

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

735

768

perror_plus("if_indextoname");

736

769

} else {

737

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

738

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

770

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

771

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

739

772

}

740

773

} else {

741

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

742

ip, port);

774

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

775

ip, (uintmax_t)port);

743

776

}

744

777

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

745

778

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

746

const char *pcret;

747

779

if(af == AF_INET6){

748

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

749

sizeof(addrstr));

780

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

781

sizeof(struct sockaddr_in6),

782

addrstr, sizeof(addrstr), NULL, 0,

783

NI_NUMERICHOST);

750

784

} else {

751

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

752

sizeof(addrstr));

785

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

786

sizeof(struct sockaddr_in),

787

addrstr, sizeof(addrstr), NULL, 0,

788

NI_NUMERICHOST);

753

789

}

754

if(pcret == NULL){

755

perror_plus("inet_ntop");

756

} else {

757

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

758

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

759

}

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);

760

796

}

761

797

}

762

798

766

802

}

767

803

768

804

if(af == AF_INET6){

769

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

805

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

806

sizeof(struct sockaddr_in6));

770

807

} else {

771

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

808

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

809

sizeof(struct sockaddr_in));

772

810

}

773

811

if(ret < 0){

774

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

812

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

775

813

int e = errno;

776

814

perror_plus("connect");

777

815

errno = e;

938

976

if(buffer_length > 0){

939

977

ssize_t decrypted_buffer_size;

940

978

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

941

&decrypted_buffer);

979

&decrypted_buffer, mc);

942

980

if(decrypted_buffer_size >= 0){

943

981

944

982

written = 0;

1005

1043

AVAHI_GCC_UNUSED AvahiStringList *txt,

1006

1044

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1007

1045

flags,

1008

AVAHI_GCC_UNUSED void* userdata){

1009

assert(r);

1046

void* mc){

1047

if(r == NULL){

1048

return;

1049

}

1010

1050

1011

1051

/* Called whenever a service has been resolved successfully or

1012

1052

timed out */

1021

1061

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

1022

1062

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

1023

1063

domain,

1024

avahi_strerror(avahi_server_errno(mc.server)));

1064

avahi_strerror(avahi_server_errno

1065

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

1025

1066

break;

1026

1067

1027

1068

case AVAHI_RESOLVER_FOUND:

1033

1074

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

1034

1075

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

1035

1076

}

1036

int ret = start_mandos_communication(ip, port, interface,

1037

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);

1038

1081

if(ret == 0){

1039

avahi_simple_poll_quit(mc.simple_poll);

1082

avahi_simple_poll_quit(simple_poll);

1040

1083

} else {

1041

if(not add_server(ip, port, interface,

1042

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)){

1043

1087

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

1044

1088

" list\n", name);

1045

1089

}

1058

1102

const char *domain,

1059

1103

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1060

1104

flags,

1061

AVAHI_GCC_UNUSED void* userdata){

1062

assert(b);

1105

void* mc){

1106

if(b == NULL){

1107

return;

1108

}

1063

1109

1064

1110

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

1065

1111

is removed from the LAN */

1073

1119

case AVAHI_BROWSER_FAILURE:

1074

1120

1075

1121

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

1076

avahi_strerror(avahi_server_errno(mc.server)));

1077

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);

1078

1125

return;

1079

1126

1080

1127

case AVAHI_BROWSER_NEW:

1083

1130

the callback function is called the Avahi server will free the

1084

1131

resolver for us. */

1085

1132

1086

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

1087

name, type, domain, protocol, 0,

1088

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)

1089

1137

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

1090

1138

" %s\n", name,

1091

avahi_strerror(avahi_server_errno(mc.server)));

1139

avahi_strerror(avahi_server_errno

1140

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

1092

1141

break;

1093

1142

1094

1143

case AVAHI_BROWSER_REMOVE:

1113

1162

signal_received = sig;

1114

1163

int old_errno = errno;

1115

1164

/* set main loop to exit */

1116

if(mc.simple_poll != NULL){

1117

avahi_simple_poll_quit(mc.simple_poll);

1165

if(simple_poll != NULL){

1166

avahi_simple_poll_quit(simple_poll);

1118

1167

}

1119

1168

errno = old_errno;

1120

1169

}

1121

1170

1122

1171

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

1123

1172

int ret;

1173

error_t ret_errno;

1124

1174

1125

1175

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

1126

1176

if(s < 0){

1177

ret_errno = errno;

1127

1178

perror_plus("socket");

1179

errno = ret_errno;

1128

1180

return false;

1129

1181

}

1130

1182

strcpy(ifr->ifr_name, ifname);

1131

1183

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1132

1184

if(ret == -1){

1133

1185

if(debug){

1186

ret_errno = errno;

1134

1187

perror_plus("ioctl SIOCGIFFLAGS");

1188

errno = ret_errno;

1135

1189

}

1136

1190

return false;

1137

1191

}

1206

1260

}

1207

1261

1208

1262

/*

1209

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

1210

* corresponds to an acceptable network device which is up.

1211

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

1212

*/

1213

int up_interface(const struct dirent *if_entry){

1214

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

1215

return 0;

1216

}

1217

1218

struct ifreq ifr;

1219

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

1220

if(debug){

1221

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

1222

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

1223

}

1224

return 0;

1225

}

1226

1227

/* Reject down interfaces */

1228

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

1229

if(debug){

1230

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

1231

if_entry->d_name);

1232

}

1233

return 0;

1234

}

1235

1236

/* Reject non-running interfaces */

1237

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

1238

if(debug){

1239

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

1240

if_entry->d_name);

1241

}

1242

return 0;

1243

}

1244

1245

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

1246

return 0;

1247

}

1248

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);

1249

1292

}

1250

1293

1251

1294

int notdotentries(const struct dirent *direntry){

1320

1363

return 1;

1321

1364

}

1322

1365

1323

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){

1324

1368

int ret;

1325

1369

struct timespec now;

1326

1370

struct timespec waited_time;

1327

1371

intmax_t block_time;

1328

1372

1329

1373

while(true){

1330

if(mc.current_server == NULL){

1331

if (debug){

1374

if(mc->current_server == NULL){

1375

if(debug){

1332

1376

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

1333

1377

" No timeout!\n");

1334

1378

}

1335

1379

ret = avahi_simple_poll_iterate(s, -1);

1336

1380

} else {

1337

if (debug){

1381

if(debug){

1338

1382

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

1339

1383

" it, or wait\n");

1340

1384

}

1347

1391

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

1348

1392

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

1349

1393

waited_time.tv_sec = (now.tv_sec

1350

- mc.current_server->last_seen.tv_sec);

1394

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

1351

1395

waited_time.tv_nsec = (now.tv_nsec

1352

- mc.current_server->last_seen.tv_nsec);

1396

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

1353

1397

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

1354

1398

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

1355

1399

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

1357

1401

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

1358

1402

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

1359

1403

1360

if (debug){

1404

if(debug){

1361

1405

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

1362

1406

block_time);

1363

1407

}

1364

1408

1365

1409

if(block_time <= 0){

1366

ret = start_mandos_communication(mc.current_server->ip,

1367

mc.current_server->port,

1368

mc.current_server->if_index,

1369

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);

1370

1414

if(ret == 0){

1371

avahi_simple_poll_quit(mc.simple_poll);

1415

avahi_simple_poll_quit(s);

1372

1416

return 0;

1373

1417

}

1374

1418

ret = clock_gettime(CLOCK_MONOTONIC,

1375

&mc.current_server->last_seen);

1419

&mc->current_server->last_seen);

1376

1420

if(ret == -1){

1377

1421

perror_plus("clock_gettime");

1378

1422

return -1;

1379

1423

}

1380

mc.current_server = mc.current_server->next;

1424

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

1381

1425

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

1382

1426

servers, but don't block */

1383

1427

}

1385

1429

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

1386

1430

}

1387

1431

if(ret != 0){

1388

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

1432

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

1389

1433

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

1390

1434

}

1391

1435

}

1432

1476

return ret_errno;

1433

1477

}

1434

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

1435

1491

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

1436

1492

const float delay){

1437

1493

struct dirent **direntries;

1438

struct dirent *direntry;

1439

int ret;

1440

1494

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

1441

1495

alphasort);

1442

1496

if(numhooks == -1){

1443

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

}

1444

1505

} else {

1506

struct dirent *direntry;

1507

int ret;

1445

1508

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

1446

1509

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

1447

1510

direntry = direntries[i];

1558

1621

return true;

1559

1622

}

1560

1623

1561

int bring_up_interface(const char *const interface,

1562

const float delay){

1624

error_t bring_up_interface(const char *const interface,

1625

const float delay){

1563

1626

int sd = -1;

1564

int old_errno = errno;

1565

int ret_errno = 0;

1566

int ret;

1627

error_t old_errno = errno;

1628

error_t ret_errno = 0;

1629

int ret, ret_setflags;

1567

1630

struct ifreq network;

1568

AvahiIfIndex if_index = (AvahiIfIndex)if_nametoindex(interface);

1631

unsigned int if_index = if_nametoindex(interface);

1569

1632

if(if_index == 0){

1570

1633

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

1571

1634

errno = old_errno;

1577

1640

return EINTR;

1578

1641

}

1579

1642

1580

/* Re-raise priviliges */

1581

raise_privileges();

1582

1583

#ifdef __linux__

1584

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1585

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

1586

ret = klogctl(8, NULL, 5);

1587

bool restore_loglevel = true;

1588

if(ret == -1){

1589

restore_loglevel = false;

1590

perror_plus("klogctl");

1591

}

1592

#endif /* __linux__ */

1593

1594

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1595

if(sd < 0){

1596

ret_errno = errno;

1597

perror_plus("socket");

1598

#ifdef __linux__

1599

if(restore_loglevel){

1600

ret = klogctl(7, NULL, 0);

1601

if(ret == -1){

1602

perror_plus("klogctl");

1603

}

1604

}

1605

#endif /* __linux__ */

1606

/* Lower privileges */

1607

lower_privileges();

1608

errno = old_errno;

1609

return ret_errno;

1610

}

1611

strcpy(network.ifr_name, interface);

1612

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

1613

if(ret == -1){

1614

ret_errno = errno;

1615

perror_plus("ioctl SIOCGIFFLAGS");

1616

#ifdef __linux__

1617

if(restore_loglevel){

1618

ret = klogctl(7, NULL, 0);

1619

if(ret == -1){

1620

perror_plus("klogctl");

1621

}

1622

}

1623

#endif /* __linux__ */

1624

/* Lower privileges */

1625

lower_privileges();

1626

errno = old_errno;

1627

return ret_errno;

1628

}

1629

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

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

}

1630

1650

network.ifr_flags |= IFF_UP;

1631

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

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));

1632

1700

if(ret == -1){

1633

ret_errno = errno;

1701

perror_plus("close");

1702

}

1703

1704

if(ret_setflags == -1){

1705

errno = ret_errno;

1634

1706

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1635

#ifdef __linux__

1636

if(restore_loglevel){

1637

ret = klogctl(7, NULL, 0);

1638

if(ret == -1){

1639

perror_plus("klogctl");

1640

}

1641

}

1642

#endif /* __linux__ */

1643

/* Lower privileges */

1644

lower_privileges();

1645

1707

errno = old_errno;

1646

1708

return ret_errno;

1647

1709

}

1710

} else if(debug){

1711

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

1712

interface);

1648

1713

}

1714

1649

1715

/* Sleep checking until interface is running.

1650

1716

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

1651

1717

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

1652

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

1653

if(ret == -1){

1654

perror_plus("ioctl SIOCGIFFLAGS");

1655

} else if(network.ifr_flags & IFF_RUNNING){

1718

if(interface_is_running(interface)){

1656

1719

break;

1657

1720

}

1658

1721

struct timespec sleeptime = { .tv_nsec = 250000000 };

1661

1724

perror_plus("nanosleep");

1662

1725

}

1663

1726

}

1664

/* Close the socket */

1665

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

1666

if(ret == -1){

1667

perror_plus("close");

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;

1668

1740

}

1669

#ifdef __linux__

1670

if(restore_loglevel){

1671

/* Restores kernel loglevel to default */

1672

ret = klogctl(7, NULL, 0);

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));

1673

1775

if(ret == -1){

1674

perror_plus("klogctl");

1675

}

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);

1676

1788

}

1677

#endif /* __linux__ */

1678

/* Lower privileges */

1679

lower_privileges();

1789

1680

1790

errno = old_errno;

1681

1791

return 0;

1682

1792

}

1683

1793

1684

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 };

1685

1799

AvahiSServiceBrowser *sb = NULL;

1686

int error;

1800

error_t ret_errno;

1687

1801

int ret;

1688

1802

intmax_t tmpmax;

1689

1803

char *tmp;

1690

1804

int exitcode = EXIT_SUCCESS;

1691

const char *interface = "";

1692

struct ifreq network;

1693

int sd = -1;

1694

bool take_down_interface = false;

1805

char *interfaces_to_take_down = NULL;

1806

size_t interfaces_to_take_down_size = 0;

1695

1807

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

1696

1808

bool tempdir_created = false;

1697

1809

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1698

1810

const char *seckey = PATHDIR "/" SECKEY;

1699

1811

const char *pubkey = PATHDIR "/" PUBKEY;

1812

char *interfaces_hooks = NULL;

1700

1813

1701

1814

bool gnutls_initialized = false;

1702

1815

bool gpgme_initialized = false;

1793

1906

connect_to = arg;

1794

1907

break;

1795

1908

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

1796

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

}

1797

1914

break;

1798

1915

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

1799

1916

seckey = arg;

1923

2040

}

1924

2041

1925

2042

/* Lower privileges */

1926

errno = 0;

1927

ret = seteuid(uid);

1928

if(ret == -1){

1929

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;

1930

2060

}

1931

2061

}

1932

2062

}

1933

2063

1934

2064

/* Run network hooks */

1935

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

1936

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

}

1937

2079

}

1938

2080

1939

2081

if(not debug){

1940

2082

avahi_set_log_function(empty_log);

1941

2083

}

1942

2084

1943

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

1944

struct dirent **direntries;

1945

/* First look for interfaces that are up */

1946

ret = scandir(sys_class_net, &direntries, up_interface,

1947

alphasort);

1948

if(ret == 0){

1949

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

1950

free(direntries);

1951

ret = scandir(sys_class_net, &direntries, good_interface,

1952

alphasort);

1953

}

1954

if(ret >= 1){

1955

/* Pick the first interface returned */

1956

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

1957

if(debug){

1958

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

1959

}

1960

if(interface == NULL){

1961

perror_plus("malloc");

1962

free(direntries);

1963

exitcode = EXIT_FAILURE;

1964

goto end;

1965

}

1966

free(direntries);

1967

} else {

1968

free(direntries);

1969

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

1970

exitcode = EXIT_FAILURE;

1971

goto end;

1972

}

1973

}

1974

1975

2085

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

1976

2086

from the signal handler */

1977

2087

/* Initialize the pseudo-RNG for Avahi */

1978

2088

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

1979

mc.simple_poll = avahi_simple_poll_new();

1980

if(mc.simple_poll == NULL){

2089

simple_poll = avahi_simple_poll_new();

2090

if(simple_poll == NULL){

1981

2091

fprintf_plus(stderr,

1982

2092

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

1983

2093

exitcode = EX_UNAVAILABLE;

2047

2157

}

2048

2158

}

2049

2159

2050

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

2051

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

2052

ret = bring_up_interface(interface, delay);

2053

if(ret != 0){

2054

errno = ret;

2055

perror_plus("Failed to bring up interface");

2056

}

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;

2207

}

2208

}

2209

break;

2210

}

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);

2057

2240

}

2058

2241

2059

2242

if(quit_now){

2060

2243

goto end;

2061

2244

}

2062

2245

2063

ret = init_gnutls_global(pubkey, seckey);

2246

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

2064

2247

if(ret == -1){

2065

2248

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

2066

2249

exitcode = EX_UNAVAILABLE;

2083

2266

goto end;

2084

2267

}

2085

2268

2086

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

2269

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

2087

2270

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

2088

2271

exitcode = EX_UNAVAILABLE;

2089

2272

goto end;

2110

2293

goto end;

2111

2294

}

2112

2295

2113

uint16_t port;

2296

in_port_t port;

2114

2297

errno = 0;

2115

2298

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

2116

2299

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

2117

or tmpmax != (uint16_t)tmpmax){

2300

or tmpmax != (in_port_t)tmpmax){

2118

2301

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

2119

2302

exitcode = EX_USAGE;

2120

2303

goto end;

2121

2304

}

2122

2305

2123

2306

if(quit_now){

2124

2307

goto end;

2125

2308

}

2126

2309

2127

port = (uint16_t)tmpmax;

2310

port = (in_port_t)tmpmax;

2128

2311

*address = '\0';

2129

2312

/* Colon in address indicates IPv6 */

2130

2313

int af;

2146

2329

}

2147

2330

2148

2331

while(not quit_now){

2149

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

2332

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

2333

&mc);

2150

2334

if(quit_now or ret == 0){

2151

2335

break;

2152

2336

}

2154

2338

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

2155

2339

(int)retry_interval);

2156

2340

}

2157

sleep((int)retry_interval);

2341

sleep((unsigned int)retry_interval);

2158

2342

}

2159

2343

2160

if (not quit_now){

2344

if(not quit_now){

2161

2345

exitcode = EXIT_SUCCESS;

2162

2346

}

2163

2347

2178

2362

config.publish_domain = 0;

2179

2363

2180

2364

/* Allocate a new server */

2181

mc.server = avahi_server_new(avahi_simple_poll_get

2182

(mc.simple_poll), &config, NULL,

2183

NULL, &error);

2365

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2366

&config, NULL, NULL, &ret_errno);

2184

2367

2185

2368

/* Free the Avahi configuration data */

2186

2369

avahi_server_config_free(&config);

2189

2372

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

2190

2373

if(mc.server == NULL){

2191

2374

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

2192

avahi_strerror(error));

2375

avahi_strerror(ret_errno));

2193

2376

exitcode = EX_UNAVAILABLE;

2194

2377

goto end;

2195

2378

}

2201

2384

/* Create the Avahi service browser */

2202

2385

sb = avahi_s_service_browser_new(mc.server, if_index,

2203

2386

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2204

NULL, 0, browse_callback, NULL);

2387

NULL, 0, browse_callback,

2388

(void *)&mc);

2205

2389

if(sb == NULL){

2206

2390

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

2207

2391

avahi_strerror(avahi_server_errno(mc.server)));

2219

2403

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

2220

2404

}

2221

2405

2222

ret = avahi_loop_with_timeout(mc.simple_poll,

2223

(int)(retry_interval * 1000));

2406

ret = avahi_loop_with_timeout(simple_poll,

2407

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

2224

2408

if(debug){

2225

2409

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

2226

2410

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

2233

2417

}

2234

2418

2235

2419

/* Cleanup things */

2420

free(mc.interfaces);

2421

2236

2422

if(sb != NULL)

2237

2423

avahi_s_service_browser_free(sb);

2238

2424

2239

2425

if(mc.server != NULL)

2240

2426

avahi_server_free(mc.server);

2241

2427

2242

if(mc.simple_poll != NULL)

2243

avahi_simple_poll_free(mc.simple_poll);

2428

if(simple_poll != NULL)

2429

avahi_simple_poll_free(simple_poll);

2244

2430

2245

2431

if(gnutls_initialized){

2246

2432

gnutls_certificate_free_credentials(mc.cred);

2263

2449

}

2264

2450

}

2265

2451

2266

/* Run network hooks */

2267

run_network_hooks("stop", interface, delay);

2268

2269

2452

/* Re-raise priviliges */

2270

2453

{

2271

2454

raise_privileges();

2272

2455

2273

/* Take down the network interface */

2274

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

2275

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

2276

if(ret == -1){

2277

perror_plus("ioctl SIOCGIFFLAGS");

2278

} else if(network.ifr_flags & IFF_UP){

2279

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

2280

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

2281

if(ret == -1){

2282

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

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");

2283

2470

}

2284

2471

}

2285

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

2286

if(ret == -1){

2287

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");

2288

2475

}

2289

2476

}

2290

}

2291

/* Lower privileges permanently */

2292

errno = 0;

2293

ret = setuid(uid);

2294

if(ret == -1){

2295

perror_plus("setuid");

2296

}

2477

2478

lower_privileges_permanently();

2479

}

2480

2481

free(interfaces_to_take_down);

2482

free(interfaces_hooks);

2297

2483

2298

2484

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

2299

2485

if(tempdir_created){

2301

2487

struct dirent *direntry = NULL;

2302

2488

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

2303

2489

alphasort);

2304

if (numentries > 0){

2490

if(numentries > 0){

2305

2491

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

2306

2492

direntry = direntries[i];

2307

2493

char *fullname = NULL;

2322

2508

2323

2509

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

2324

2510

free(direntries);

2325

if (numentries == -1){

2511

if(numentries == -1){

2326

2512

perror_plus("scandir");

2327

2513

}

2328

2514

ret = rmdir(tempdir);