/mandos/release : revision 237.7.133

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

10

*

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* Everything else is

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*

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

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

73

*/

74

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

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

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setgid(), pause() */

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

77

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

78

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

79

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

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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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

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WEXITSTATUS(), WTERMSIG() */

90

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

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91

92

#ifdef __linux__

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93

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

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111

init_gnutls_session(),

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112

GNUTLS_* */

112

113

#include <gnutls/openpgp.h>

113

/* gnutls_certificate_set_openpgp_key_file(),

114

GNUTLS_OPENPGP_FMT_BASE64 */

114

/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* GPGME */

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118

#include <gpgme.h> /* All GPGME types, constants and

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134

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

134

135

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

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136

char *connect_to = NULL;

137

const char *hookdir = HOOKDIR;

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138

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139

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

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typedef struct server{

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170

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/* Function to use when printing errors */

170

172

void perror_plus(const char *print_text){

173

int e = errno;

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

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175

program_invocation_short_name);

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errno = e;

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perror(print_text);

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}

175

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180

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

181

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

182

va_list ap;

183

va_start (ap, format);

184

185

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

186

program_invocation_short_name));

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

188

}

189

176

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/*

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

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192

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

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193

* "buffer_length" is how much is already used.

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194

*/

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195

size_t incbuffer(char **buffer, size_t buffer_length,

182

size_t buffer_capacity){

196

size_t buffer_capacity){

183

197

if(buffer_length + BUFFER_SIZE > buffer_capacity){

184

198

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

185

199

if(buffer == NULL){

191

205

}

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206

193

207

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

194

int add_server(const char *ip, uint16_t port,

195

AvahiIfIndex if_index,

196

int af){

208

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

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int af){

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int ret;

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

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if(new_server == NULL){

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perror_plus("malloc");

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return -1;

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return false;

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215

}

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

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.port = port,

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.if_index = if_index,

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.af = af };

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.port = port,

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.if_index = if_index,

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.af = af };

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if(new_server->ip == NULL){

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perror_plus("strdup");

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return -1;

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return false;

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}

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/* Special case of first server */

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225

if (mc.current_server == NULL){

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236

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

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237

if(ret == -1){

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238

perror_plus("clock_gettime");

226

return -1;

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return false;

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240

}

228

return 0;

241

return true;

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242

}

230

243

231

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/*

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* Initialize GPGME.

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*/

234

static bool init_gpgme(const char *seckey,

235

const char *pubkey, const char *tempdir){

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

248

const char *tempdir){

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gpgme_error_t rc;

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gpgme_engine_info_t engine_info;

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

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if(rc != GPG_ERR_NO_ERROR){

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

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"bad gpgme_data_new_from_fd: %s: %s\n",

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gpgme_strsource(rc), gpgme_strerror(rc));

269

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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272

}

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rc = gpgme_op_import(mc.ctx, pgp_data);

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if(rc != GPG_ERR_NO_ERROR){

264

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

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"bad gpgme_op_import: %s: %s\n",

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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}

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if(debug){

279

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

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"Initializing GPGME\n");

290

fprintf_plus(stderr, "Initializing GPGME\n");

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}

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/* Init GPGME */

284

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gpgme_check_version(NULL);

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rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

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if(rc != GPG_ERR_NO_ERROR){

287

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

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"bad gpgme_engine_check_version: %s: %s\n",

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gpgme_strsource(rc), gpgme_strerror(rc));

297

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

298

gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

291

300

}

292

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

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303

rc = gpgme_get_engine_info(&engine_info);

295

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if(rc != GPG_ERR_NO_ERROR){

296

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

297

"bad gpgme_get_engine_info: %s: %s\n",

298

gpgme_strsource(rc), gpgme_strerror(rc));

305

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

306

gpgme_strsource(rc), gpgme_strerror(rc));

299

307

return false;

300

308

}

301

309

while(engine_info != NULL){

307

315

engine_info = engine_info->next;

308

316

}

309

317

if(engine_info == NULL){

310

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

311

"Could not set GPGME home dir to %s\n", tempdir);

318

fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",

319

tempdir);

312

320

return false;

313

321

}

314

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315

323

/* Create new GPGME "context" */

316

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

317

325

if(rc != GPG_ERR_NO_ERROR){

318

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

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

320

gpgme_strerror(rc));

326

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

327

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

328

gpgme_strerror(rc));

321

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return false;

322

330

}

323

331

342

350

ssize_t plaintext_length = 0;

343

351

344

352

if(debug){

345

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

346

"Trying to decrypt OpenPGP data\n");

353

fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");

347

354

}

348

355

349

356

/* Create new GPGME data buffer from memory cryptotext */

350

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rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

351

358

0);

352

359

if(rc != GPG_ERR_NO_ERROR){

353

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

354

"bad gpgme_data_new_from_mem: %s: %s\n",

355

gpgme_strsource(rc), gpgme_strerror(rc));

360

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

361

gpgme_strsource(rc), gpgme_strerror(rc));

356

362

return -1;

357

363

}

358

364

359

365

/* Create new empty GPGME data buffer for the plaintext */

360

366

rc = gpgme_data_new(&dh_plain);

361

367

if(rc != GPG_ERR_NO_ERROR){

362

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

363

"bad gpgme_data_new: %s: %s\n",

364

gpgme_strsource(rc), gpgme_strerror(rc));

368

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

369

"bad gpgme_data_new: %s: %s\n",

370

gpgme_strsource(rc), gpgme_strerror(rc));

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371

gpgme_data_release(dh_crypto);

366

372

return -1;

367

373

}

370

376

data buffer */

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

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if(rc != GPG_ERR_NO_ERROR){

373

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

374

"bad gpgme_op_decrypt: %s: %s\n",

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gpgme_strsource(rc), gpgme_strerror(rc));

379

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

380

gpgme_strsource(rc), gpgme_strerror(rc));

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plaintext_length = -1;

377

382

if(debug){

378

383

gpgme_decrypt_result_t result;

379

384

result = gpgme_op_decrypt_result(mc.ctx);

380

385

if(result == NULL){

381

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

382

"gpgme_op_decrypt_result failed\n");

386

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

383

387

} else {

384

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

385

"Unsupported algorithm: %s\n",

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result->unsupported_algorithm);

387

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

388

"Wrong key usage: %u\n",

389

result->wrong_key_usage);

388

fprintf_plus(stderr, "Unsupported algorithm: %s\n",

389

result->unsupported_algorithm);

390

fprintf_plus(stderr, "Wrong key usage: %u\n",

391

result->wrong_key_usage);

390

392

if(result->file_name != NULL){

391

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

392

"File name: %s\n", result->file_name);

393

fprintf_plus(stderr, "File name: %s\n", result->file_name);

393

394

}

394

395

gpgme_recipient_t recipient;

395

396

recipient = result->recipients;

396

397

while(recipient != NULL){

397

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

398

"Public key algorithm: %s\n",

399

gpgme_pubkey_algo_name(recipient->pubkey_algo));

400

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

401

"Key ID: %s\n", recipient->keyid);

402

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

403

"Secret key available: %s\n",

404

recipient->status == GPG_ERR_NO_SECKEY

405

? "No" : "Yes");

398

fprintf_plus(stderr, "Public key algorithm: %s\n",

399

gpgme_pubkey_algo_name

400

(recipient->pubkey_algo));

401

fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);

402

fprintf_plus(stderr, "Secret key available: %s\n",

403

recipient->status == GPG_ERR_NO_SECKEY

404

? "No" : "Yes");

406

405

recipient = recipient->next;

407

406

}

408

407

}

411

410

}

412

411

413

412

if(debug){

414

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

415

"Decryption of OpenPGP data succeeded\n");

413

fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");

416

414

}

417

415

418

416

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

425

423

*plaintext = NULL;

426

424

while(true){

427

425

plaintext_capacity = incbuffer(plaintext,

428

(size_t)plaintext_length,

429

plaintext_capacity);

426

(size_t)plaintext_length,

427

plaintext_capacity);

430

428

if(plaintext_capacity == 0){

431

perror_plus("incbuffer");

432

plaintext_length = -1;

433

goto decrypt_end;

429

perror_plus("incbuffer");

430

plaintext_length = -1;

431

goto decrypt_end;

434

432

}

435

433

436

434

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

449

447

}

450

448

451

449

if(debug){

452

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

453

"Decrypted password is: ");

450

fprintf_plus(stderr, "Decrypted password is: ");

454

451

for(ssize_t i = 0; i < plaintext_length; i++){

455

452

fprintf(stderr, "%02hhX ", (*plaintext)[i]);

456

453

}

478

475

/* GnuTLS log function callback */

479

476

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

480

477

const char* string){

481

fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);

478

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

482

479

}

483

480

484

481

static int init_gnutls_global(const char *pubkeyfilename,

486

483

int ret;

487

484

488

485

if(debug){

489

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

490

"Initializing GnuTLS\n");

486

fprintf_plus(stderr, "Initializing GnuTLS\n");

491

487

}

492

488

493

489

ret = gnutls_global_init();

494

490

if(ret != GNUTLS_E_SUCCESS){

495

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

496

"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));

491

fprintf_plus(stderr, "GnuTLS global_init: %s\n",

492

safer_gnutls_strerror(ret));

497

493

return -1;

498

494

}

499

495

508

504

/* OpenPGP credentials */

509

505

ret = gnutls_certificate_allocate_credentials(&mc.cred);

510

506

if(ret != GNUTLS_E_SUCCESS){

511

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

512

"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));

507

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

508

safer_gnutls_strerror(ret));

513

509

gnutls_global_deinit();

514

510

return -1;

515

511

}

516

512

517

513

if(debug){

518

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

519

"Attempting to use OpenPGP public key %s and"

520

" secret key %s as GnuTLS credentials\n", pubkeyfilename,

521

seckeyfilename);

514

fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"

515

" secret key %s as GnuTLS credentials\n",

516

pubkeyfilename,

517

seckeyfilename);

522

518

}

523

519

524

520

ret = gnutls_certificate_set_openpgp_key_file

525

521

(mc.cred, pubkeyfilename, seckeyfilename,

526

522

GNUTLS_OPENPGP_FMT_BASE64);

527

523

if(ret != GNUTLS_E_SUCCESS){

528

fprintf(stderr,

529

"Mandos plugin mandos-client: "

530

"Error[%d] while reading the OpenPGP key pair ('%s',"

531

" '%s')\n", ret, pubkeyfilename, seckeyfilename);

532

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

533

"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));

524

fprintf_plus(stderr,

525

"Error[%d] while reading the OpenPGP key pair ('%s',"

526

" '%s')\n", ret, pubkeyfilename, seckeyfilename);

527

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

528

safer_gnutls_strerror(ret));

534

529

goto globalfail;

535

530

}

536

531

537

532

/* GnuTLS server initialization */

538

533

ret = gnutls_dh_params_init(&mc.dh_params);

539

534

if(ret != GNUTLS_E_SUCCESS){

540

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

541

"Error in GnuTLS DH parameter initialization:"

542

" %s\n", safer_gnutls_strerror(ret));

535

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

536

" initialization: %s\n",

537

safer_gnutls_strerror(ret));

543

538

goto globalfail;

544

539

}

545

540

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

546

541

if(ret != GNUTLS_E_SUCCESS){

547

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

548

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

549

safer_gnutls_strerror(ret));

542

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

543

safer_gnutls_strerror(ret));

550

544

goto globalfail;

551

545

}

552

546

572

566

}

573

567

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

574

568

if(ret != GNUTLS_E_SUCCESS){

575

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

576

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

577

safer_gnutls_strerror(ret));

569

fprintf_plus(stderr,

570

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

571

safer_gnutls_strerror(ret));

578

572

}

579

573

580

574

{

587

581

}

588

582

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

589

583

if(ret != GNUTLS_E_SUCCESS){

590

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

591

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

592

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

593

"GnuTLS error: %s\n", safer_gnutls_strerror(ret));

584

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

585

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

586

safer_gnutls_strerror(ret));

594

587

gnutls_deinit(*session);

595

588

return -1;

596

589

}

605

598

}

606

599

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

607

600

if(ret != GNUTLS_E_SUCCESS){

608

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

609

"Error setting GnuTLS credentials: %s\n",

610

safer_gnutls_strerror(ret));

601

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

602

safer_gnutls_strerror(ret));

611

603

gnutls_deinit(*session);

612

604

return -1;

613

605

}

658

650

pf = PF_INET;

659

651

break;

660

652

default:

661

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

662

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

653

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

663

654

errno = EINVAL;

664

655

return -1;

665

656

}

670

661

}

671

662

672

663

if(debug){

673

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

674

"Setting up a TCP connection to %s, port %" PRIu16

675

"\n", ip, port);

664

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

665

PRIu16 "\n", ip, port);

676

666

}

677

667

678

668

tcp_sd = socket(pf, SOCK_STREAM, 0);

704

694

}

705

695

if(ret == 0){

706

696

int e = errno;

707

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

708

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

697

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

709

698

errno = e;

710

699

goto mandos_end;

711

700

}

716

705

717

706

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

718

707

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

719

-Wunreachable-code*/

708

-Wunreachable-code*/

720

709

if(if_index == AVAHI_IF_UNSPEC){

721

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

722

"An IPv6 link-local address is incomplete"

723

" without a network interface\n");

710

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

711

" incomplete without a network interface\n");

724

712

errno = EINVAL;

725

713

goto mandos_end;

726

714

}

744

732

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

745

733

perror_plus("if_indextoname");

746

734

} else {

747

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

748

"Connection to: %s%%%s, port %" PRIu16 "\n",

749

ip, interface, port);

735

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

736

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

750

737

}

751

738

} else {

752

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

753

"Connection to: %s, port %" PRIu16 "\n", ip, port);

739

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

740

ip, port);

754

741

}

755

742

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

756

743

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

766

753

perror_plus("inet_ntop");

767

754

} else {

768

755

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

769

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

770

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

756

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

771

757

}

772

758

}

773

759

}

801

787

while(true){

802

788

size_t out_size = strlen(out);

803

789

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

804

out_size - written));

790

out_size - written));

805

791

if(ret == -1){

806

792

int e = errno;

807

793

perror_plus("write");

827

813

}

828

814

829

815

if(debug){

830

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

831

"Establishing TLS session with %s\n", ip);

816

fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);

832

817

}

833

818

834

819

if(quit_now){

854

839

855

840

if(ret != GNUTLS_E_SUCCESS){

856

841

if(debug){

857

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

858

"*** GnuTLS Handshake failed ***\n");

842

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

859

843

gnutls_perror(ret);

860

844

}

861

845

errno = EPROTO;

865

849

/* Read OpenPGP packet that contains the wanted password */

866

850

867

851

if(debug){

868

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

869

"Retrieving OpenPGP encrypted password from %s\n", ip);

852

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

853

" %s\n", ip);

870

854

}

871

855

872

856

while(true){

877

861

}

878

862

879

863

buffer_capacity = incbuffer(&buffer, buffer_length,

880

buffer_capacity);

864

buffer_capacity);

881

865

if(buffer_capacity == 0){

882

866

int e = errno;

883

867

perror_plus("incbuffer");

910

894

}

911

895

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

912

896

if(ret < 0){

913

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

914

"*** GnuTLS Re-handshake failed ***\n");

897

fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "

898

"***\n");

915

899

gnutls_perror(ret);

916

900

errno = EPROTO;

917

901

goto mandos_end;

918

902

}

919

903

break;

920

904

default:

921

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

922

"Unknown error while reading data from"

923

" encrypted session with Mandos server\n");

905

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

906

" encrypted session with Mandos server\n");

924

907

gnutls_bye(session, GNUTLS_SHUT_RDWR);

925

908

errno = EIO;

926

909

goto mandos_end;

931

914

}

932

915

933

916

if(debug){

934

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

935

"Closing TLS session\n");

917

fprintf_plus(stderr, "Closing TLS session\n");

936

918

}

937

919

938

920

if(quit_now){

950

932

951

933

if(buffer_length > 0){

952

934

ssize_t decrypted_buffer_size;

953

decrypted_buffer_size = pgp_packet_decrypt(buffer,

954

buffer_length,

935

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

955

936

&decrypted_buffer);

956

937

if(decrypted_buffer_size >= 0){

957

938

968

949

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

969

950

int e = errno;

970

951

if(debug){

971

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

972

"Error writing encrypted data: %s\n",

973

strerror(errno));

952

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

953

strerror(errno));

974

954

}

975

955

errno = e;

976

956

goto mandos_end;

1033

1013

switch(event){

1034

1014

default:

1035

1015

case AVAHI_RESOLVER_FAILURE:

1036

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

1037

"(Avahi Resolver) Failed to resolve service '%s'"

1038

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

1039

avahi_strerror(avahi_server_errno(mc.server)));

1016

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

1017

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

1018

domain,

1019

avahi_strerror(avahi_server_errno(mc.server)));

1040

1020

break;

1041

1021

1042

1022

case AVAHI_RESOLVER_FOUND:

1044

1024

char ip[AVAHI_ADDRESS_STR_MAX];

1045

1025

avahi_address_snprint(ip, sizeof(ip), address);

1046

1026

if(debug){

1047

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

1048

"Mandos server \"%s\" found on %s (%s, %"

1049

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

1050

ip, (intmax_t)interface, port);

1027

fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"

1028

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

1029

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

1051

1030

}

1052

1031

int ret = start_mandos_communication(ip, port, interface,

1053

1032

avahi_proto_to_af(proto));

1054

1033

if(ret == 0){

1055

1034

avahi_simple_poll_quit(mc.simple_poll);

1056

1035

} else {

1057

ret = add_server(ip, port, interface,

1058

avahi_proto_to_af(proto));

1036

if(not add_server(ip, port, interface,

1037

avahi_proto_to_af(proto))){

1038

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

1039

" list\n", name);

1040

}

1059

1041

}

1060

1042

}

1061

1043

}

1085

1067

default:

1086

1068

case AVAHI_BROWSER_FAILURE:

1087

1069

1088

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

1089

"(Avahi browser) %s\n",

1090

avahi_strerror(avahi_server_errno(mc.server)));

1070

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

1071

avahi_strerror(avahi_server_errno(mc.server)));

1091

1072

avahi_simple_poll_quit(mc.simple_poll);

1092

1073

return;

1093

1074

1100

1081

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

1101

1082

name, type, domain, protocol, 0,

1102

1083

resolve_callback, NULL) == NULL)

1103

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

1104

"Avahi: Failed to resolve service '%s': %s\n",

1105

name, avahi_strerror(avahi_server_errno(mc.server)));

1084

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

1085

" %s\n", name,

1086

avahi_strerror(avahi_server_errno(mc.server)));

1106

1087

break;

1107

1088

1108

1089

case AVAHI_BROWSER_REMOVE:

1111

1092

case AVAHI_BROWSER_ALL_FOR_NOW:

1112

1093

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1113

1094

if(debug){

1114

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

1115

"No Mandos server found, still searching...\n");

1095

fprintf_plus(stderr, "No Mandos server found, still"

1096

" searching...\n");

1116

1097

}

1117

1098

break;

1118

1099

}

1157

1138

/* Reject the loopback device */

1158

1139

if(ifr->ifr_flags & IFF_LOOPBACK){

1159

1140

if(debug){

1160

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

1161

"Rejecting loopback interface \"%s\"\n", ifname);

1141

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

1142

ifname);

1162

1143

}

1163

1144

return false;

1164

1145

}

1165

1146

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

1166

1147

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

1167

1148

if(debug){

1168

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

1169

"Accepting point-to-point interface \"%s\"\n", ifname);

1149

fprintf_plus(stderr, "Accepting point-to-point interface"

1150

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

1170

1151

}

1171

1152

return true;

1172

1153

}

1173

1154

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

1174

1155

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

1175

1156

if(debug){

1176

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

1177

"Rejecting non-broadcast interface \"%s\"\n", ifname);

1157

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1158

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

1178

1159

}

1179

1160

return false;

1180

1161

}

1181

1162

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

1182

1163

if(ifr->ifr_flags & IFF_NOARP){

1183

1164

if(debug){

1184

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

1185

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

1165

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

1166

ifname);

1186

1167

}

1187

1168

return false;

1188

1169

}

1189

1170

1190

1171

/* Accept this device */

1191

1172

if(debug){

1192

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

1193

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

1173

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

1194

1174

}

1195

1175

return true;

1196

1176

}

1208

1188

struct ifreq ifr;

1209

1189

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

1210

1190

if(debug){

1211

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

1212

"Failed to get flags for interface \"%s\"\n",

1213

if_entry->d_name);

1191

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

1192

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

1214

1193

}

1215

1194

return 0;

1216

1195

}

1234

1213

struct ifreq ifr;

1235

1214

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

1236

1215

if(debug){

1237

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

1238

"Failed to get flags for interface \"%s\"\n",

1239

if_entry->d_name);

1216

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

1217

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

1240

1218

}

1241

1219

return 0;

1242

1220

}

1244

1222

/* Reject down interfaces */

1245

1223

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

1246

1224

if(debug){

1247

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

1248

"Rejecting down interface \"%s\"\n",

1249

if_entry->d_name);

1225

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

1226

if_entry->d_name);

1250

1227

}

1251

1228

return 0;

1252

1229

}

1254

1231

/* Reject non-running interfaces */

1255

1232

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

1256

1233

if(debug){

1257

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

1258

"Rejecting non-running interface \"%s\"\n",

1259

if_entry->d_name);

1234

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

1235

if_entry->d_name);

1260

1236

}

1261

1237

return 0;

1262

1238

}

1281

1257

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

1282

1258

int runnable_hook(const struct dirent *direntry){

1283

1259

int ret;

1260

size_t sret;

1284

1261

struct stat st;

1285

1262

1286

1263

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

1288

1265

return 0;

1289

1266

}

1290

1267

1291

/* Save pointer to last character */

1292

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

1293

1294

if(*end == '~'){

1295

/* Backup name~ */

1296

return 0;

1297

}

1298

1299

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

1300

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

1301

/* Temporary #name# */

1302

return 0;

1303

}

1304

1305

/* XXX more rules here */

1306

1307

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

1268

sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"

1269

"abcdefghijklmnopqrstuvwxyz"

1270

"0123456789"

1271

"_-");

1272

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

1273

/* Contains non-allowed characters */

1274

if(debug){

1275

fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",

1276

direntry->d_name);

1277

}

1278

return 0;

1279

}

1280

1281

char *fullname = NULL;

1282

ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);

1283

if(ret < 0){

1284

perror_plus("asprintf");

1285

return 0;

1286

}

1287

1288

ret = stat(fullname, &st);

1308

1289

if(ret == -1){

1309

1290

if(debug){

1310

perror_plus("Could not stat plugin");

1291

perror_plus("Could not stat hook");

1311

1292

}

1312

1293

return 0;

1313

1294

}

1314

1295

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

1315

1296

/* Not a regular file */

1297

if(debug){

1298

fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",

1299

direntry->d_name);

1300

}

1316

1301

return 0;

1317

1302

}

1318

1303

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

1319

1304

/* Not executable */

1305

if(debug){

1306

fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",

1307

direntry->d_name);

1308

}

1320

1309

return 0;

1321

1310

}

1311

if(debug){

1312

fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",

1313

direntry->d_name);

1314

}

1322

1315

return 1;

1323

1316

}

1324

1317

1331

1324

while(true){

1332

1325

if(mc.current_server == NULL){

1333

1326

if (debug){

1334

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

1335

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

1327

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

1328

" No timeout!\n");

1336

1329

}

1337

1330

ret = avahi_simple_poll_iterate(s, -1);

1338

1331

} else {

1339

1332

if (debug){

1340

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

1341

"Check current_server if we should run it,"

1342

" or wait\n");

1333

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

1334

" it, or wait\n");

1343

1335

}

1344

1336

/* the current time */

1345

1337

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1361

1353

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

1362

1354

1363

1355

if (debug){

1364

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

1365

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

1356

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

1357

block_time);

1366

1358

}

1367

1359

1368

1360

if(block_time <= 0){

1395

1387

}

1396

1388

}

1397

1389

1390

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

1391

const float delay){

1392

struct dirent **direntries;

1393

struct dirent *direntry;

1394

int ret;

1395

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

1396

alphasort);

1397

if(numhooks == -1){

1398

perror_plus("scandir");

1399

} else {

1400

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

1401

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

1402

direntry = direntries[i];

1403

char *fullname = NULL;

1404

ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);

1405

if(ret < 0){

1406

perror_plus("asprintf");

1407

continue;

1408

}

1409

if(debug){

1410

fprintf_plus(stderr, "Running network hook \"%s\"\n",

1411

direntry->d_name);

1412

}

1413

pid_t hook_pid = fork();

1414

if(hook_pid == 0){

1415

/* Child */

1416

/* Raise privileges */

1417

errno = 0;

1418

ret = seteuid(0);

1419

if(ret == -1){

1420

perror_plus("seteuid");

1421

}

1422

/* Raise privileges even more */

1423

errno = 0;

1424

ret = setuid(0);

1425

if(ret == -1){

1426

perror_plus("setuid");

1427

}

1428

/* Set group */

1429

errno = 0;

1430

ret = setgid(0);

1431

if(ret == -1){

1432

perror_plus("setgid");

1433

}

1434

/* Reset supplementary groups */

1435

errno = 0;

1436

ret = setgroups(0, NULL);

1437

if(ret == -1){

1438

perror_plus("setgroups");

1439

}

1440

dup2(devnull, STDIN_FILENO);

1441

close(devnull);

1442

dup2(STDERR_FILENO, STDOUT_FILENO);

1443

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

1444

if(ret == -1){

1445

perror_plus("setenv");

1446

_exit(EX_OSERR);

1447

}

1448

ret = setenv("DEVICE", interface, 1);

1449

if(ret == -1){

1450

perror_plus("setenv");

1451

_exit(EX_OSERR);

1452

}

1453

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

1454

if(ret == -1){

1455

perror_plus("setenv");

1456

_exit(EX_OSERR);

1457

}

1458

ret = setenv("MODE", mode, 1);

1459

if(ret == -1){

1460

perror_plus("setenv");

1461

_exit(EX_OSERR);

1462

}

1463

char *delaystring;

1464

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

1465

if(ret == -1){

1466

perror_plus("asprintf");

1467

_exit(EX_OSERR);

1468

}

1469

ret = setenv("DELAY", delaystring, 1);

1470

if(ret == -1){

1471

free(delaystring);

1472

perror_plus("setenv");

1473

_exit(EX_OSERR);

1474

}

1475

free(delaystring);

1476

if(connect_to != NULL){

1477

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

1478

if(ret == -1){

1479

perror_plus("setenv");

1480

_exit(EX_OSERR);

1481

}

1482

}

1483

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

1484

perror_plus("execl");

1485

_exit(EXIT_FAILURE);

1486

}

1487

} else {

1488

int status;

1489

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

1490

perror_plus("waitpid");

1491

free(fullname);

1492

continue;

1493

}

1494

if(WIFEXITED(status)){

1495

if(WEXITSTATUS(status) != 0){

1496

fprintf_plus(stderr, "Warning: network hook \"%s\" exited"

1497

" with status %d\n", direntry->d_name,

1498

WEXITSTATUS(status));

1499

free(fullname);

1500

continue;

1501

}

1502

} else if(WIFSIGNALED(status)){

1503

fprintf_plus(stderr, "Warning: network hook \"%s\" died by"

1504

" signal %d\n", direntry->d_name,

1505

WTERMSIG(status));

1506

free(fullname);

1507

continue;

1508

} else {

1509

fprintf_plus(stderr, "Warning: network hook \"%s\""

1510

" crashed\n", direntry->d_name);

1511

free(fullname);

1512

continue;

1513

}

1514

}

1515

free(fullname);

1516

if(debug){

1517

fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",

1518

direntry->d_name);

1519

}

1520

}

1521

close(devnull);

1522

}

1523

return true;

1524

}

1525

1398

1526

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

1399

1527

AvahiSServiceBrowser *sb = NULL;

1400

1528

int error;

1480

1608

.group = 2 },

1481

1609

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

1482

1610

.arg = "SECONDS",

1483

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

1611

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

1612

.group = 2 },

1613

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

1614

.arg = "DIR",

1615

.doc = "Directory where network hooks are located",

1484

1616

.group = 2 },

1485

1617

/*

1486

1618

* These reproduce what we would get without ARGP_NO_HELP

1540

1672

argp_error(state, "Bad retry interval");

1541

1673

}

1542

1674

break;

1675

case 133: /* --network-hook-dir */

1676

hookdir = arg;

1677

break;

1543

1678

/*

1544

1679

* These reproduce what we would get without ARGP_NO_HELP

1545

1680

*/

1551

1686

argp_state_help(state, state->out_stream,

1552

1687

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1553

1688

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

1554

fprintf(state->out_stream, "Mandos plugin mandos-client: ");

1555

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

1689

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

1556

1690

exit(argp_err_exit_status);

1557

1691

break;

1558

1692

default:

1585

1719

{

1586

1720

/* Work around Debian bug #633582:

1587

1721

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

1588

struct stat st;

1589

1722

1590

1723

/* Re-raise priviliges */

1591

1724

errno = 0;

1592

1725

ret = seteuid(0);

1593

1726

if(ret == -1){

1594

1727

perror_plus("seteuid");

1595

}

1596

1597

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

1598

int seckey_fd = open(seckey, O_RDONLY);

1599

if(seckey_fd == -1){

1600

perror_plus("open");

1601

} else {

1602

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

1603

if(ret == -1){

1604

perror_plus("fstat");

1605

} else {

1606

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

1607

ret = fchown(seckey_fd, uid, gid);

1608

if(ret == -1){

1609

perror_plus("fchown");

1610

}

1611

}

1612

}

1613

TEMP_FAILURE_RETRY(close(seckey_fd));

1614

}

1615

}

1616

1617

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

1618

int pubkey_fd = open(pubkey, O_RDONLY);

1619

if(pubkey_fd == -1){

1620

perror_plus("open");

1621

} else {

1622

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

1623

if(ret == -1){

1624

perror_plus("fstat");

1625

} else {

1626

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

1627

ret = fchown(pubkey_fd, uid, gid);

1628

if(ret == -1){

1629

perror_plus("fchown");

1630

}

1631

}

1632

}

1633

TEMP_FAILURE_RETRY(close(pubkey_fd));

1634

}

1635

}

1636

1637

/* Lower privileges */

1638

errno = 0;

1639

ret = seteuid(uid);

1640

if(ret == -1){

1641

perror_plus("seteuid");

1642

}

1643

}

1644

1645

/* Find network hooks and run them */

1646

{

1647

struct dirent **direntries;

1648

struct dirent *direntry;

1649

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

1650

alphasort);

1651

if(numhooks == -1){

1652

perror_plus("scandir");

1653

1728

} else {

1654

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

1655

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

1656

direntry = direntries[0];

1657

char *fullname = NULL;

1658

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

1659

direntry->d_name);

1660

if(ret < 0){

1661

perror_plus("asprintf");

1662

continue;

1663

}

1664

pid_t hook_pid = fork();

1665

if(hook_pid == 0){

1666

/* Child */

1667

dup2(devnull, STDIN_FILENO);

1668

close(devnull);

1669

dup2(STDERR_FILENO, STDOUT_FILENO);

1670

ret = setenv("DEVICE", interface, 1);

1671

if(ret == -1){

1672

perror_plus("setenv");

1673

exit(1);

1674

}

1675

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

1676

if(ret == -1){

1677

perror_plus("setenv");

1678

exit(1);

1679

}

1680

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

1681

if(ret == -1){

1682

perror_plus("setenv");

1683

exit(1);

1684

}

1685

char *delaystring;

1686

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

1687

if(ret == -1){

1688

perror_plus("asprintf");

1689

exit(1);

1690

}

1691

ret = setenv("DELAY", delaystring, 1);

1692

if(ret == -1){

1693

free(delaystring);

1694

perror_plus("setenv");

1695

exit(1);

1696

}

1697

free(delaystring);

1698

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

1699

perror_plus("execl");

1700

} else {

1701

int status;

1702

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

1703

perror_plus("waitpid");

1704

free(fullname);

1705

continue;

1706

}

1707

if(WIFEXITED(status)){

1708

if(WEXITSTATUS(status) != 0){

1709

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

1710

"Warning: network hook \"%s\" exited"

1711

" with status %d\n", direntry->d_name,

1712

WEXITSTATUS(status));

1713

free(fullname);

1714

continue;

1715

}

1716

} else if(WIFSIGNALED(status)){

1717

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

1718

"Warning: network hook \"%s\" died by"

1719

" signal %d\n", direntry->d_name,

1720

WTERMSIG(status));

1721

free(fullname);

1722

continue;

1723

} else {

1724

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

1725

"Warning: network hook \"%s\" crashed\n",

1726

direntry->d_name);

1727

free(fullname);

1728

continue;

1729

}

1730

}

1731

free(fullname);

1732

if(quit_now){

1733

goto end;

1734

}

1735

}

1736

close(devnull);

1729

struct stat st;

1730

1731

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

1732

int seckey_fd = open(seckey, O_RDONLY);

1733

if(seckey_fd == -1){

1734

perror_plus("open");

1735

} else {

1736

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

1737

if(ret == -1){

1738

perror_plus("fstat");

1739

} else {

1740

if(S_ISREG(st.st_mode)

1741

and st.st_uid == 0 and st.st_gid == 0){

1742

ret = fchown(seckey_fd, uid, gid);

1743

if(ret == -1){

1744

perror_plus("fchown");

1745

}

1746

}

1747

}

1748

TEMP_FAILURE_RETRY(close(seckey_fd));

1749

}

1750

}

1751

1752

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

1753

int pubkey_fd = open(pubkey, O_RDONLY);

1754

if(pubkey_fd == -1){

1755

perror_plus("open");

1756

} else {

1757

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

1758

if(ret == -1){

1759

perror_plus("fstat");

1760

} else {

1761

if(S_ISREG(st.st_mode)

1762

and st.st_uid == 0 and st.st_gid == 0){

1763

ret = fchown(pubkey_fd, uid, gid);

1764

if(ret == -1){

1765

perror_plus("fchown");

1766

}

1767

}

1768

}

1769

TEMP_FAILURE_RETRY(close(pubkey_fd));

1770

}

1771

}

1772

1773

/* Lower privileges */

1774

errno = 0;

1775

ret = seteuid(uid);

1776

if(ret == -1){

1777

perror_plus("seteuid");

1778

}

1737

1779

}

1738

1780

}

1739

1781

1782

/* Run network hooks */

1783

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

1784

goto end;

1785

}

1786

1740

1787

if(not debug){

1741

1788

avahi_set_log_function(empty_log);

1742

1789

}

1756

1803

/* Pick the first interface returned */

1757

1804

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

1758

1805

if(debug){

1759

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

1760

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

1806

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

1761

1807

}

1762

1808

if(interface == NULL){

1763

1809

perror_plus("malloc");

1768

1814

free(direntries);

1769

1815

} else {

1770

1816

free(direntries);

1771

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

1772

"Could not find a network interface\n");

1817

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

1773

1818

exitcode = EXIT_FAILURE;

1774

1819

goto end;

1775

1820

}

1781

1826

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

1782

1827

mc.simple_poll = avahi_simple_poll_new();

1783

1828

if(mc.simple_poll == NULL){

1784

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

1785

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

1829

fprintf_plus(stderr,

1830

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

1786

1831

exitcode = EX_UNAVAILABLE;

1787

1832

goto end;

1788

1833

}

1854

1899

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

1855

1900

if_index = (AvahiIfIndex) if_nametoindex(interface);

1856

1901

if(if_index == 0){

1857

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

1858

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

1902

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

1859

1903

exitcode = EX_UNAVAILABLE;

1860

1904

goto end;

1861

1905

}

1981

2025

#endif /* __linux__ */

1982

2026

/* Lower privileges */

1983

2027

errno = 0;

1984

if(take_down_interface){

1985

/* Lower privileges */

1986

ret = seteuid(uid);

1987

if(ret == -1){

1988

perror_plus("seteuid");

1989

}

1990

} else {

1991

/* Lower privileges permanently */

1992

ret = setuid(uid);

1993

if(ret == -1){

1994

perror_plus("setuid");

1995

}

2028

/* Lower privileges */

2029

ret = seteuid(uid);

2030

if(ret == -1){

2031

perror_plus("seteuid");

1996

2032

}

1997

2033

}

1998

2034

2002

2038

2003

2039

ret = init_gnutls_global(pubkey, seckey);

2004

2040

if(ret == -1){

2005

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

2006

"init_gnutls_global failed\n");

2041

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

2007

2042

exitcode = EX_UNAVAILABLE;

2008

2043

goto end;

2009

2044

} else {

2025

2060

}

2026

2061

2027

2062

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

2028

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

2029

"init_gpgme failed\n");

2063

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

2030

2064

exitcode = EX_UNAVAILABLE;

2031

2065

goto end;

2032

2066

} else {

2042

2076

/* (Mainly meant for debugging) */

2043

2077

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

2044

2078

if(address == NULL){

2045

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

2046

"No colon in address\n");

2079

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

2047

2080

exitcode = EX_USAGE;

2048

2081

goto end;

2049

2082

}

2057

2090

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

2058

2091

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

2059

2092

or tmpmax != (uint16_t)tmpmax){

2060

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

2061

"Bad port number\n");

2093

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

2062

2094

exitcode = EX_USAGE;

2063

2095

goto end;

2064

2096

}

2094

2126

break;

2095

2127

}

2096

2128

if(debug){

2097

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

2098

"Retrying in %d seconds\n", (int)retry_interval);

2129

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

2130

(int)retry_interval);

2099

2131

}

2100

2132

sleep((int)retry_interval);

2101

2133

}

2131

2163

2132

2164

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

2133

2165

if(mc.server == NULL){

2134

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

2135

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

2136

avahi_strerror(error));

2166

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

2167

avahi_strerror(error));

2137

2168

exitcode = EX_UNAVAILABLE;

2138

2169

goto end;

2139

2170

}

2147

2178

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2148

2179

NULL, 0, browse_callback, NULL);

2149

2180

if(sb == NULL){

2150

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

2151

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

2152

avahi_strerror(avahi_server_errno(mc.server)));

2181

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

2182

avahi_strerror(avahi_server_errno(mc.server)));

2153

2183

exitcode = EX_UNAVAILABLE;

2154

2184

goto end;

2155

2185

}

2161

2191

/* Run the main loop */

2162

2192

2163

2193

if(debug){

2164

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

2165

"Starting Avahi loop search\n");

2194

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

2166

2195

}

2167

2196

2168

2197

ret = avahi_loop_with_timeout(mc.simple_poll,

2169

2198

(int)(retry_interval * 1000));

2170

2199

if(debug){

2171

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

2172

"avahi_loop_with_timeout exited %s\n",

2173

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

2200

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

2201

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

2174

2202

}

2175

2203

2176

2204

end:

2177

2205

2178

2206

if(debug){

2179

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

2180

"%s exiting\n", argv[0]);

2207

fprintf_plus(stderr, "%s exiting\n", argv[0]);

2181

2208

}

2182

2209

2183

2210

/* Cleanup things */

2199

2226

if(gpgme_initialized){

2200

2227

gpgme_release(mc.ctx);

2201

2228

}

2202

2229

2203

2230

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

2204

2231

has seen */

2205

2232

if(mc.current_server != NULL){

2211

2238

}

2212

2239

}

2213

2240

2214

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

2241

/* Run network hooks */

2242

run_network_hooks("stop", interface, delay);

2215

2243

2216

/* Take down the network interface */

2217

if(take_down_interface){

2218

/* Re-raise priviliges */

2244

/* Re-raise priviliges */

2245

{

2219

2246

errno = 0;

2220

2247

ret = seteuid(0);

2221

2248

if(ret == -1){

2222

2249

perror_plus("seteuid");

2223

2250

}

2224

if(geteuid() == 0){

2251

2252

/* Take down the network interface */

2253

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

2225

2254

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

2226

2255

if(ret == -1){

2227

2256

perror_plus("ioctl SIOCGIFFLAGS");

2236

2265

if(ret == -1){

2237

2266

perror_plus("close");

2238

2267

}

2239

/* Lower privileges permanently */

2240

errno = 0;

2241

ret = setuid(uid);

2242

if(ret == -1){

2243

perror_plus("setuid");

2244

}

2245

2268

}

2246

2269

}

2270

/* Lower privileges permanently */

2271

errno = 0;

2272

ret = setuid(uid);

2273

if(ret == -1){

2274

perror_plus("setuid");

2275

}

2247

2276

2248

2277

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

2249

2278

if(tempdir_created){

2263

2292

}

2264

2293

ret = remove(fullname);

2265

2294

if(ret == -1){

2266

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

2267

"remove(\"%s\"): %s\n", fullname, strerror(errno));

2295

fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,

2296

strerror(errno));

2268

2297

}

2269

2298

free(fullname);

2270

2299

}