/mandos/release : revision 237.7.142

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

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*

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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

16

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

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

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stdout, ferror(), remove() */

44

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

44

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

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

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

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strtof(), abort() */

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*/

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#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() */

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

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

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#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() */

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

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#ifdef __linux__

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#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(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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116

117

/* GPGME */

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

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/* Function to use when printing errors */

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void perror_plus(const char *print_text){

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int e = errno;

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

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program_invocation_short_name);

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errno = e;

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perror(print_text);

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}

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__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));

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}

189

177

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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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* "buffer_length" is how much is already used.

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194

*/

182

195

size_t incbuffer(char **buffer, size_t buffer_length,

183

size_t buffer_capacity){

196

size_t buffer_capacity){

184

197

if(buffer_length + BUFFER_SIZE > buffer_capacity){

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198

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

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199

if(buffer == NULL){

192

205

}

193

206

194

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

195

int add_server(const char *ip, uint16_t port,

196

AvahiIfIndex if_index,

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int af){

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

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int af){

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int ret;

199

211

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

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if(new_server == NULL){

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213

perror_plus("malloc");

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return -1;

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return false;

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}

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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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if (mc.current_server == NULL){

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236

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

225

237

if(ret == -1){

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238

perror_plus("clock_gettime");

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return -1;

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return false;

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240

}

229

return 0;

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return true;

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242

}

231

243

232

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/*

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* Initialize GPGME.

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*/

235

static bool init_gpgme(const char *seckey,

236

const char *pubkey, const char *tempdir){

247

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){

257

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));

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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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}

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rc = gpgme_op_import(mc.ctx, pgp_data);

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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_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){

280

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

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"Initializing GPGME\n");

290

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

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291

}

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/* Init GPGME */

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gpgme_check_version(NULL);

286

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rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

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if(rc != GPG_ERR_NO_ERROR){

288

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;

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300

}

293

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

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rc = gpgme_get_engine_info(&engine_info);

296

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if(rc != GPG_ERR_NO_ERROR){

297

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

298

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

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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));

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return false;

301

308

}

302

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while(engine_info != NULL){

308

315

engine_info = engine_info->next;

309

316

}

310

317

if(engine_info == NULL){

311

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

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"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);

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return false;

314

321

}

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/* Create new GPGME "context" */

317

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

318

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if(rc != GPG_ERR_NO_ERROR){

319

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

320

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

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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));

322

329

return false;

323

330

}

324

331

343

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ssize_t plaintext_length = 0;

344

351

345

352

if(debug){

346

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

347

"Trying to decrypt OpenPGP data\n");

353

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

348

354

}

349

355

350

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

351

357

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

352

358

0);

353

359

if(rc != GPG_ERR_NO_ERROR){

354

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

355

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

356

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));

357

362

return -1;

358

363

}

359

364

360

365

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

361

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rc = gpgme_data_new(&dh_plain);

362

367

if(rc != GPG_ERR_NO_ERROR){

363

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

364

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

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gpgme_strsource(rc), gpgme_strerror(rc));

368

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

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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371

gpgme_data_release(dh_crypto);

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372

return -1;

368

373

}

371

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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){

374

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

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"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",

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gpgme_strsource(rc), gpgme_strerror(rc));

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plaintext_length = -1;

378

382

if(debug){

379

383

gpgme_decrypt_result_t result;

380

384

result = gpgme_op_decrypt_result(mc.ctx);

381

385

if(result == NULL){

382

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

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"gpgme_op_decrypt_result failed\n");

386

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

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387

} else {

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

386

"Unsupported algorithm: %s\n",

387

result->unsupported_algorithm);

388

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

389

"Wrong key usage: %u\n",

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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",

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result->wrong_key_usage);

391

392

if(result->file_name != NULL){

392

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

393

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

393

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

394

}

395

gpgme_recipient_t recipient;

396

recipient = result->recipients;

397

while(recipient != NULL){

398

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

399

"Public key algorithm: %s\n",

400

gpgme_pubkey_algo_name(recipient->pubkey_algo));

401

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

402

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

403

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

404

"Secret key available: %s\n",

405

recipient->status == GPG_ERR_NO_SECKEY

406

? "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");

407

405

recipient = recipient->next;

408

406

}

409

407

}

412

410

}

413

411

414

412

if(debug){

415

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

416

"Decryption of OpenPGP data succeeded\n");

413

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

417

414

}

418

415

419

416

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

426

423

*plaintext = NULL;

427

424

while(true){

428

425

plaintext_capacity = incbuffer(plaintext,

429

(size_t)plaintext_length,

430

plaintext_capacity);

426

(size_t)plaintext_length,

427

plaintext_capacity);

431

428

if(plaintext_capacity == 0){

432

perror_plus("incbuffer");

433

plaintext_length = -1;

434

goto decrypt_end;

429

perror_plus("incbuffer");

430

plaintext_length = -1;

431

goto decrypt_end;

435

432

}

436

433

437

434

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

450

447

}

451

448

452

449

if(debug){

453

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

454

"Decrypted password is: ");

450

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

455

451

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

456

452

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

457

453

}

479

475

/* GnuTLS log function callback */

480

476

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

481

477

const char* string){

482

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

478

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

483

479

}

484

480

485

481

static int init_gnutls_global(const char *pubkeyfilename,

487

483

int ret;

488

484

489

485

if(debug){

490

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

491

"Initializing GnuTLS\n");

486

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

492

487

}

493

488

494

489

ret = gnutls_global_init();

495

490

if(ret != GNUTLS_E_SUCCESS){

496

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

497

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

491

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

492

safer_gnutls_strerror(ret));

498

493

return -1;

499

494

}

500

495

509

504

/* OpenPGP credentials */

510

505

ret = gnutls_certificate_allocate_credentials(&mc.cred);

511

506

if(ret != GNUTLS_E_SUCCESS){

512

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

513

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

507

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

508

safer_gnutls_strerror(ret));

514

509

gnutls_global_deinit();

515

510

return -1;

516

511

}

517

512

518

513

if(debug){

519

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

520

"Attempting to use OpenPGP public key %s and"

521

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

522

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);

523

518

}

524

519

525

520

ret = gnutls_certificate_set_openpgp_key_file

526

521

(mc.cred, pubkeyfilename, seckeyfilename,

527

522

GNUTLS_OPENPGP_FMT_BASE64);

528

523

if(ret != GNUTLS_E_SUCCESS){

529

fprintf(stderr,

530

"Mandos plugin mandos-client: "

531

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

532

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

533

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

534

"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));

535

529

goto globalfail;

536

530

}

537

531

538

532

/* GnuTLS server initialization */

539

533

ret = gnutls_dh_params_init(&mc.dh_params);

540

534

if(ret != GNUTLS_E_SUCCESS){

541

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

542

"Error in GnuTLS DH parameter initialization:"

543

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

535

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

536

" initialization: %s\n",

537

safer_gnutls_strerror(ret));

544

538

goto globalfail;

545

539

}

546

540

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

547

541

if(ret != GNUTLS_E_SUCCESS){

548

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

549

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

550

safer_gnutls_strerror(ret));

542

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

543

safer_gnutls_strerror(ret));

551

544

goto globalfail;

552

545

}

553

546

573

566

}

574

567

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

575

568

if(ret != GNUTLS_E_SUCCESS){

576

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

577

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

578

safer_gnutls_strerror(ret));

569

fprintf_plus(stderr,

570

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

571

safer_gnutls_strerror(ret));

579

572

}

580

573

581

574

{

588

581

}

589

582

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

590

583

if(ret != GNUTLS_E_SUCCESS){

591

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

592

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

593

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

594

"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));

595

587

gnutls_deinit(*session);

596

588

return -1;

597

589

}

606

598

}

607

599

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

608

600

if(ret != GNUTLS_E_SUCCESS){

609

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

610

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

611

safer_gnutls_strerror(ret));

601

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

602

safer_gnutls_strerror(ret));

612

603

gnutls_deinit(*session);

613

604

return -1;

614

605

}

659

650

pf = PF_INET;

660

651

break;

661

652

default:

662

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

663

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

653

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

664

654

errno = EINVAL;

665

655

return -1;

666

656

}

671

661

}

672

662

673

663

if(debug){

674

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

675

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

676

"\n", ip, port);

664

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

665

PRIu16 "\n", ip, port);

677

666

}

678

667

679

668

tcp_sd = socket(pf, SOCK_STREAM, 0);

705

694

}

706

695

if(ret == 0){

707

696

int e = errno;

708

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

709

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

697

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

710

698

errno = e;

711

699

goto mandos_end;

712

700

}

717

705

718

706

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

719

707

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

720

-Wunreachable-code*/

708

-Wunreachable-code*/

721

709

if(if_index == AVAHI_IF_UNSPEC){

722

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

723

"An IPv6 link-local address is incomplete"

724

" without a network interface\n");

710

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

711

" incomplete without a network interface\n");

725

712

errno = EINVAL;

726

713

goto mandos_end;

727

714

}

745

732

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

746

733

perror_plus("if_indextoname");

747

734

} else {

748

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

749

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

750

ip, interface, port);

735

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

736

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

751

737

}

752

738

} else {

753

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

754

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

739

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

740

ip, port);

755

741

}

756

742

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

757

743

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

767

753

perror_plus("inet_ntop");

768

754

} else {

769

755

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

770

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

771

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

756

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

772

757

}

773

758

}

774

759

}

802

787

while(true){

803

788

size_t out_size = strlen(out);

804

789

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

805

out_size - written));

790

out_size - written));

806

791

if(ret == -1){

807

792

int e = errno;

808

793

perror_plus("write");

828

813

}

829

814

830

815

if(debug){

831

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

832

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

816

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

833

817

}

834

818

835

819

if(quit_now){

837

821

goto mandos_end;

838

822

}

839

823

840

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

841

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

824

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

825

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

826

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

827

gnutls_transport_set_ptr(session,

828

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

842

829

843

830

if(quit_now){

844

831

errno = EINTR;

855

842

856

843

if(ret != GNUTLS_E_SUCCESS){

857

844

if(debug){

858

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

859

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

845

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

860

846

gnutls_perror(ret);

861

847

}

862

848

errno = EPROTO;

866

852

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

867

853

868

854

if(debug){

869

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

870

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

855

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

856

" %s\n", ip);

871

857

}

872

858

873

859

while(true){

878

864

}

879

865

880

866

buffer_capacity = incbuffer(&buffer, buffer_length,

881

buffer_capacity);

867

buffer_capacity);

882

868

if(buffer_capacity == 0){

883

869

int e = errno;

884

870

perror_plus("incbuffer");

911

897

}

912

898

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

913

899

if(ret < 0){

914

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

915

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

900

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

901

"***\n");

916

902

gnutls_perror(ret);

917

903

errno = EPROTO;

918

904

goto mandos_end;

919

905

}

920

906

break;

921

907

default:

922

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

923

"Unknown error while reading data from"

924

" encrypted session with Mandos server\n");

908

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

909

" encrypted session with Mandos server\n");

925

910

gnutls_bye(session, GNUTLS_SHUT_RDWR);

926

911

errno = EIO;

927

912

goto mandos_end;

932

917

}

933

918

934

919

if(debug){

935

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

936

"Closing TLS session\n");

920

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

937

921

}

938

922

939

923

if(quit_now){

951

935

952

936

if(buffer_length > 0){

953

937

ssize_t decrypted_buffer_size;

954

decrypted_buffer_size = pgp_packet_decrypt(buffer,

955

buffer_length,

938

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

956

939

&decrypted_buffer);

957

940

if(decrypted_buffer_size >= 0){

958

941

969

952

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

970

953

int e = errno;

971

954

if(debug){

972

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

973

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

974

strerror(errno));

955

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

956

strerror(errno));

975

957

}

976

958

errno = e;

977

959

goto mandos_end;

1034

1016

switch(event){

1035

1017

default:

1036

1018

case AVAHI_RESOLVER_FAILURE:

1037

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

1038

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

1039

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

1040

avahi_strerror(avahi_server_errno(mc.server)));

1019

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

1020

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

1021

domain,

1022

avahi_strerror(avahi_server_errno(mc.server)));

1041

1023

break;

1042

1024

1043

1025

case AVAHI_RESOLVER_FOUND:

1045

1027

char ip[AVAHI_ADDRESS_STR_MAX];

1046

1028

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

1047

1029

if(debug){

1048

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

1049

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

1050

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

1051

ip, (intmax_t)interface, port);

1030

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

1031

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

1032

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

1052

1033

}

1053

1034

int ret = start_mandos_communication(ip, port, interface,

1054

1035

avahi_proto_to_af(proto));

1055

1036

if(ret == 0){

1056

1037

avahi_simple_poll_quit(mc.simple_poll);

1057

1038

} else {

1058

ret = add_server(ip, port, interface,

1059

avahi_proto_to_af(proto));

1039

if(not add_server(ip, port, interface,

1040

avahi_proto_to_af(proto))){

1041

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

1042

" list\n", name);

1043

}

1060

1044

}

1061

1045

}

1062

1046

}

1086

1070

default:

1087

1071

case AVAHI_BROWSER_FAILURE:

1088

1072

1089

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

1090

"(Avahi browser) %s\n",

1091

avahi_strerror(avahi_server_errno(mc.server)));

1073

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

1074

avahi_strerror(avahi_server_errno(mc.server)));

1092

1075

avahi_simple_poll_quit(mc.simple_poll);

1093

1076

return;

1094

1077

1101

1084

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

1102

1085

name, type, domain, protocol, 0,

1103

1086

resolve_callback, NULL) == NULL)

1104

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

1105

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

1106

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

1087

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

1088

" %s\n", name,

1089

avahi_strerror(avahi_server_errno(mc.server)));

1107

1090

break;

1108

1091

1109

1092

case AVAHI_BROWSER_REMOVE:

1112

1095

case AVAHI_BROWSER_ALL_FOR_NOW:

1113

1096

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1114

1097

if(debug){

1115

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

1116

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

1098

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

1099

" searching...\n");

1117

1100

}

1118

1101

break;

1119

1102

}

1158

1141

/* Reject the loopback device */

1159

1142

if(ifr->ifr_flags & IFF_LOOPBACK){

1160

1143

if(debug){

1161

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

1162

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

1144

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

1145

ifname);

1163

1146

}

1164

1147

return false;

1165

1148

}

1166

1149

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

1167

1150

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

1168

1151

if(debug){

1169

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

1170

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

1152

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

1153

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

1171

1154

}

1172

1155

return true;

1173

1156

}

1174

1157

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

1175

1158

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

1176

1159

if(debug){

1177

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

1178

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

1160

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1161

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

1179

1162

}

1180

1163

return false;

1181

1164

}

1182

1165

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

1183

1166

if(ifr->ifr_flags & IFF_NOARP){

1184

1167

if(debug){

1185

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

1186

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

1168

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

1169

ifname);

1187

1170

}

1188

1171

return false;

1189

1172

}

1190

1173

1191

1174

/* Accept this device */

1192

1175

if(debug){

1193

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

1194

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

1176

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

1195

1177

}

1196

1178

return true;

1197

1179

}

1209

1191

struct ifreq ifr;

1210

1192

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

1211

1193

if(debug){

1212

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

1213

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

1214

if_entry->d_name);

1194

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

1195

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

1215

1196

}

1216

1197

return 0;

1217

1198

}

1235

1216

struct ifreq ifr;

1236

1217

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

1237

1218

if(debug){

1238

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

1239

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

1240

if_entry->d_name);

1219

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

1220

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

1241

1221

}

1242

1222

return 0;

1243

1223

}

1245

1225

/* Reject down interfaces */

1246

1226

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

1247

1227

if(debug){

1248

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

1249

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

1250

if_entry->d_name);

1228

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

1229

if_entry->d_name);

1251

1230

}

1252

1231

return 0;

1253

1232

}

1255

1234

/* Reject non-running interfaces */

1256

1235

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

1257

1236

if(debug){

1258

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

1259

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

1260

if_entry->d_name);

1237

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

1238

if_entry->d_name);

1261

1239

}

1262

1240

return 0;

1263

1241

}

1282

1260

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

1283

1261

int runnable_hook(const struct dirent *direntry){

1284

1262

int ret;

1263

size_t sret;

1285

1264

struct stat st;

1286

1265

1287

1266

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

1289

1268

return 0;

1290

1269

}

1291

1270

1292

/* Save pointer to last character */

1293

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

1294

1295

if(*end == '~'){

1296

/* Backup name~ */

1297

return 0;

1298

}

1299

1300

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

1301

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

1302

/* Temporary #name# */

1303

return 0;

1304

}

1305

1306

/* XXX more rules here */

1271

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

1272

"abcdefghijklmnopqrstuvwxyz"

1273

"0123456789"

1274

"_-");

1275

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

1276

/* Contains non-allowed characters */

1277

if(debug){

1278

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

1279

direntry->d_name);

1280

}

1281

return 0;

1282

}

1307

1283

1308

1284

char *fullname = NULL;

1309

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

1310

direntry->d_name);

1285

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

1311

1286

if(ret < 0){

1312

1287

perror_plus("asprintf");

1313

1288

return 0;

1316

1291

ret = stat(fullname, &st);

1317

1292

if(ret == -1){

1318

1293

if(debug){

1319

perror_plus("Could not stat plugin");

1294

perror_plus("Could not stat hook");

1320

1295

}

1321

1296

return 0;

1322

1297

}

1323

1298

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

1324

1299

/* Not a regular file */

1300

if(debug){

1301

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

1302

direntry->d_name);

1303

}

1325

1304

return 0;

1326

1305

}

1327

1306

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

1328

1307

/* Not executable */

1308

if(debug){

1309

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

1310

direntry->d_name);

1311

}

1329

1312

return 0;

1330

1313

}

1314

if(debug){

1315

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

1316

direntry->d_name);

1317

}

1331

1318

return 1;

1332

1319

}

1333

1320

1340

1327

while(true){

1341

1328

if(mc.current_server == NULL){

1342

1329

if (debug){

1343

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

1344

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

1330

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

1331

" No timeout!\n");

1345

1332

}

1346

1333

ret = avahi_simple_poll_iterate(s, -1);

1347

1334

} else {

1348

1335

if (debug){

1349

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

1350

"Check current_server if we should run it,"

1351

" or wait\n");

1336

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

1337

" it, or wait\n");

1352

1338

}

1353

1339

/* the current time */

1354

1340

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1370

1356

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

1371

1357

1372

1358

if (debug){

1373

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

1374

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

1359

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

1360

block_time);

1375

1361

}

1376

1362

1377

1363

if(block_time <= 0){

1404

1390

}

1405

1391

}

1406

1392

1393

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

1394

const float delay){

1395

struct dirent **direntries;

1396

struct dirent *direntry;

1397

int ret;

1398

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

1399

alphasort);

1400

if(numhooks == -1){

1401

perror_plus("scandir");

1402

} else {

1403

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

1404

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

1405

direntry = direntries[i];

1406

char *fullname = NULL;

1407

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

1408

if(ret < 0){

1409

perror_plus("asprintf");

1410

continue;

1411

}

1412

if(debug){

1413

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

1414

direntry->d_name);

1415

}

1416

pid_t hook_pid = fork();

1417

if(hook_pid == 0){

1418

/* Child */

1419

/* Raise privileges */

1420

errno = 0;

1421

ret = seteuid(0);

1422

if(ret == -1){

1423

perror_plus("seteuid");

1424

}

1425

/* Raise privileges even more */

1426

errno = 0;

1427

ret = setuid(0);

1428

if(ret == -1){

1429

perror_plus("setuid");

1430

}

1431

/* Set group */

1432

errno = 0;

1433

ret = setgid(0);

1434

if(ret == -1){

1435

perror_plus("setgid");

1436

}

1437

/* Reset supplementary groups */

1438

errno = 0;

1439

ret = setgroups(0, NULL);

1440

if(ret == -1){

1441

perror_plus("setgroups");

1442

}

1443

dup2(devnull, STDIN_FILENO);

1444

close(devnull);

1445

dup2(STDERR_FILENO, STDOUT_FILENO);

1446

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

1447

if(ret == -1){

1448

perror_plus("setenv");

1449

_exit(EX_OSERR);

1450

}

1451

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

1452

if(ret == -1){

1453

perror_plus("setenv");

1454

_exit(EX_OSERR);

1455

}

1456

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

1457

if(ret == -1){

1458

perror_plus("setenv");

1459

_exit(EX_OSERR);

1460

}

1461

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

1462

if(ret == -1){

1463

perror_plus("setenv");

1464

_exit(EX_OSERR);

1465

}

1466

char *delaystring;

1467

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

1468

if(ret == -1){

1469

perror_plus("asprintf");

1470

_exit(EX_OSERR);

1471

}

1472

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

1473

if(ret == -1){

1474

free(delaystring);

1475

perror_plus("setenv");

1476

_exit(EX_OSERR);

1477

}

1478

free(delaystring);

1479

if(connect_to != NULL){

1480

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

1481

if(ret == -1){

1482

perror_plus("setenv");

1483

_exit(EX_OSERR);

1484

}

1485

}

1486

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

1487

perror_plus("execl");

1488

_exit(EXIT_FAILURE);

1489

}

1490

} else {

1491

int status;

1492

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

1493

perror_plus("waitpid");

1494

free(fullname);

1495

continue;

1496

}

1497

if(WIFEXITED(status)){

1498

if(WEXITSTATUS(status) != 0){

1499

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

1500

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

1501

WEXITSTATUS(status));

1502

free(fullname);

1503

continue;

1504

}

1505

} else if(WIFSIGNALED(status)){

1506

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

1507

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

1508

WTERMSIG(status));

1509

free(fullname);

1510

continue;

1511

} else {

1512

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

1513

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

1514

free(fullname);

1515

continue;

1516

}

1517

}

1518

free(fullname);

1519

if(debug){

1520

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

1521

direntry->d_name);

1522

}

1523

}

1524

close(devnull);

1525

}

1526

return true;

1527

}

1528

1407

1529

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

1408

1530

AvahiSServiceBrowser *sb = NULL;

1409

1531

int error;

1489

1611

.group = 2 },

1490

1612

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

1491

1613

.arg = "SECONDS",

1492

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

1614

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

1493

1615

.group = 2 },

1494

1616

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

1495

1617

.arg = "DIR",

1567

1689

argp_state_help(state, state->out_stream,

1568

1690

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1569

1691

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

1570

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

1571

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

1692

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

1572

1693

exit(argp_err_exit_status);

1573

1694

break;

1574

1695

default:

1601

1722

{

1602

1723

/* Work around Debian bug #633582:

1603

1724

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

1604

struct stat st;

1605

1725

1606

1726

/* Re-raise priviliges */

1607

1727

errno = 0;

1608

1728

ret = seteuid(0);

1609

1729

if(ret == -1){

1610

1730

perror_plus("seteuid");

1611

}

1612

1613

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

1614

int seckey_fd = open(seckey, O_RDONLY);

1615

if(seckey_fd == -1){

1616

perror_plus("open");

1617

} else {

1618

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

1619

if(ret == -1){

1620

perror_plus("fstat");

1621

} else {

1622

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

1623

ret = fchown(seckey_fd, uid, gid);

1624

if(ret == -1){

1625

perror_plus("fchown");

1626

}

1627

}

1628

}

1629

TEMP_FAILURE_RETRY(close(seckey_fd));

1630

}

1631

}

1632

1633

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

1634

int pubkey_fd = open(pubkey, O_RDONLY);

1635

if(pubkey_fd == -1){

1636

perror_plus("open");

1637

} else {

1638

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

1639

if(ret == -1){

1640

perror_plus("fstat");

1641

} else {

1642

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

1643

ret = fchown(pubkey_fd, uid, gid);

1644

if(ret == -1){

1645

perror_plus("fchown");

1646

}

1647

}

1648

}

1649

TEMP_FAILURE_RETRY(close(pubkey_fd));

1650

}

1651

}

1652

1653

/* Lower privileges */

1654

errno = 0;

1655

ret = seteuid(uid);

1656

if(ret == -1){

1657

perror_plus("seteuid");

1658

}

1659

}

1660

1661

/* Find network hooks and run them */

1662

{

1663

struct dirent **direntries;

1664

struct dirent *direntry;

1665

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

1666

alphasort);

1667

if(numhooks == -1){

1668

perror_plus("scandir");

1669

1731

} else {

1670

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

1671

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

1672

direntry = direntries[0];

1673

char *fullname = NULL;

1674

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

1675

if(ret < 0){

1676

perror_plus("asprintf");

1677

continue;

1678

}

1679

pid_t hook_pid = fork();

1680

if(hook_pid == 0){

1681

/* Child */

1682

dup2(devnull, STDIN_FILENO);

1683

close(devnull);

1684

dup2(STDERR_FILENO, STDOUT_FILENO);

1685

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

1686

if(ret == -1){

1687

perror_plus("setenv");

1688

exit(1);

1689

}

1690

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

1691

if(ret == -1){

1692

perror_plus("setenv");

1693

exit(1);

1694

}

1695

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

1696

if(ret == -1){

1697

perror_plus("setenv");

1698

exit(1);

1699

}

1700

char *delaystring;

1701

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

1702

if(ret == -1){

1703

perror_plus("asprintf");

1704

exit(1);

1705

}

1706

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

1707

if(ret == -1){

1708

free(delaystring);

1709

perror_plus("setenv");

1710

exit(1);

1711

}

1712

free(delaystring);

1713

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

1714

perror_plus("execl");

1715

} else {

1716

int status;

1717

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

1718

perror_plus("waitpid");

1719

free(fullname);

1720

continue;

1721

}

1722

if(WIFEXITED(status)){

1723

if(WEXITSTATUS(status) != 0){

1724

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

1725

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

1726

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

1727

WEXITSTATUS(status));

1728

free(fullname);

1729

continue;

1730

}

1731

} else if(WIFSIGNALED(status)){

1732

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

1733

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

1734

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

1735

WTERMSIG(status));

1736

free(fullname);

1737

continue;

1738

} else {

1739

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

1740

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

1741

direntry->d_name);

1742

free(fullname);

1743

continue;

1744

}

1745

}

1746

free(fullname);

1747

if(quit_now){

1748

goto end;

1749

}

1750

}

1751

close(devnull);

1732

struct stat st;

1733

1734

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

1735

int seckey_fd = open(seckey, O_RDONLY);

1736

if(seckey_fd == -1){

1737

perror_plus("open");

1738

} else {

1739

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

1740

if(ret == -1){

1741

perror_plus("fstat");

1742

} else {

1743

if(S_ISREG(st.st_mode)

1744

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

1745

ret = fchown(seckey_fd, uid, gid);

1746

if(ret == -1){

1747

perror_plus("fchown");

1748

}

1749

}

1750

}

1751

TEMP_FAILURE_RETRY(close(seckey_fd));

1752

}

1753

}

1754

1755

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

1756

int pubkey_fd = open(pubkey, O_RDONLY);

1757

if(pubkey_fd == -1){

1758

perror_plus("open");

1759

} else {

1760

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

1761

if(ret == -1){

1762

perror_plus("fstat");

1763

} else {

1764

if(S_ISREG(st.st_mode)

1765

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

1766

ret = fchown(pubkey_fd, uid, gid);

1767

if(ret == -1){

1768

perror_plus("fchown");

1769

}

1770

}

1771

}

1772

TEMP_FAILURE_RETRY(close(pubkey_fd));

1773

}

1774

}

1775

1776

/* Lower privileges */

1777

errno = 0;

1778

ret = seteuid(uid);

1779

if(ret == -1){

1780

perror_plus("seteuid");

1781

}

1752

1782

}

1753

1783

}

1754

1784

1785

/* Run network hooks */

1786

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

1787

goto end;

1788

}

1789

1755

1790

if(not debug){

1756

1791

avahi_set_log_function(empty_log);

1757

1792

}

1771

1806

/* Pick the first interface returned */

1772

1807

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

1773

1808

if(debug){

1774

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

1775

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

1809

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

1776

1810

}

1777

1811

if(interface == NULL){

1778

1812

perror_plus("malloc");

1783

1817

free(direntries);

1784

1818

} else {

1785

1819

free(direntries);

1786

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

1787

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

1820

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

1788

1821

exitcode = EXIT_FAILURE;

1789

1822

goto end;

1790

1823

}

1796

1829

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

1797

1830

mc.simple_poll = avahi_simple_poll_new();

1798

1831

if(mc.simple_poll == NULL){

1799

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

1800

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

1832

fprintf_plus(stderr,

1833

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

1801

1834

exitcode = EX_UNAVAILABLE;

1802

1835

goto end;

1803

1836

}

1869

1902

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

1870

1903

if_index = (AvahiIfIndex) if_nametoindex(interface);

1871

1904

if(if_index == 0){

1872

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

1873

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

1905

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

1874

1906

exitcode = EX_UNAVAILABLE;

1875

1907

goto end;

1876

1908

}

1996

2028

#endif /* __linux__ */

1997

2029

/* Lower privileges */

1998

2030

errno = 0;

1999

if(take_down_interface){

2000

/* Lower privileges */

2001

ret = seteuid(uid);

2002

if(ret == -1){

2003

perror_plus("seteuid");

2004

}

2005

} else {

2006

/* Lower privileges permanently */

2007

ret = setuid(uid);

2008

if(ret == -1){

2009

perror_plus("setuid");

2010

}

2031

/* Lower privileges */

2032

ret = seteuid(uid);

2033

if(ret == -1){

2034

perror_plus("seteuid");

2011

2035

}

2012

2036

}

2013

2037

2017

2041

2018

2042

ret = init_gnutls_global(pubkey, seckey);

2019

2043

if(ret == -1){

2020

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

2021

"init_gnutls_global failed\n");

2044

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

2022

2045

exitcode = EX_UNAVAILABLE;

2023

2046

goto end;

2024

2047

} else {

2040

2063

}

2041

2064

2042

2065

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

2043

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

2044

"init_gpgme failed\n");

2066

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

2045

2067

exitcode = EX_UNAVAILABLE;

2046

2068

goto end;

2047

2069

} else {

2057

2079

/* (Mainly meant for debugging) */

2058

2080

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

2059

2081

if(address == NULL){

2060

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

2061

"No colon in address\n");

2082

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

2062

2083

exitcode = EX_USAGE;

2063

2084

goto end;

2064

2085

}

2072

2093

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

2073

2094

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

2074

2095

or tmpmax != (uint16_t)tmpmax){

2075

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

2076

"Bad port number\n");

2096

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

2077

2097

exitcode = EX_USAGE;

2078

2098

goto end;

2079

2099

}

2109

2129

break;

2110

2130

}

2111

2131

if(debug){

2112

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

2113

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

2132

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

2133

(int)retry_interval);

2114

2134

}

2115

2135

sleep((int)retry_interval);

2116

2136

}

2146

2166

2147

2167

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

2148

2168

if(mc.server == NULL){

2149

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

2150

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

2151

avahi_strerror(error));

2169

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

2170

avahi_strerror(error));

2152

2171

exitcode = EX_UNAVAILABLE;

2153

2172

goto end;

2154

2173

}

2162

2181

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2163

2182

NULL, 0, browse_callback, NULL);

2164

2183

if(sb == NULL){

2165

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

2166

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

2167

avahi_strerror(avahi_server_errno(mc.server)));

2184

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

2185

avahi_strerror(avahi_server_errno(mc.server)));

2168

2186

exitcode = EX_UNAVAILABLE;

2169

2187

goto end;

2170

2188

}

2176

2194

/* Run the main loop */

2177

2195

2178

2196

if(debug){

2179

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

2180

"Starting Avahi loop search\n");

2197

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

2181

2198

}

2182

2199

2183

2200

ret = avahi_loop_with_timeout(mc.simple_poll,

2184

2201

(int)(retry_interval * 1000));

2185

2202

if(debug){

2186

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

2187

"avahi_loop_with_timeout exited %s\n",

2188

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

2203

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

2204

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

2189

2205

}

2190

2206

2191

2207

end:

2192

2208

2193

2209

if(debug){

2194

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

2195

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

2210

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

2196

2211

}

2197

2212

2198

2213

/* Cleanup things */

2214

2229

if(gpgme_initialized){

2215

2230

gpgme_release(mc.ctx);

2216

2231

}

2217

2232

2218

2233

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

2219

2234

has seen */

2220

2235

if(mc.current_server != NULL){

2226

2241

}

2227

2242

}

2228

2243

2229

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

2244

/* Run network hooks */

2245

run_network_hooks("stop", interface, delay);

2230

2246

2231

/* Take down the network interface */

2232

if(take_down_interface){

2233

/* Re-raise priviliges */

2247

/* Re-raise priviliges */

2248

{

2234

2249

errno = 0;

2235

2250

ret = seteuid(0);

2236

2251

if(ret == -1){

2237

2252

perror_plus("seteuid");

2238

2253

}

2239

if(geteuid() == 0){

2254

2255

/* Take down the network interface */

2256

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

2240

2257

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

2241

2258

if(ret == -1){

2242

2259

perror_plus("ioctl SIOCGIFFLAGS");

2251

2268

if(ret == -1){

2252

2269

perror_plus("close");

2253

2270

}

2254

/* Lower privileges permanently */

2255

errno = 0;

2256

ret = setuid(uid);

2257

if(ret == -1){

2258

perror_plus("setuid");

2259

}

2260

2271

}

2261

2272

}

2273

/* Lower privileges permanently */

2274

errno = 0;

2275

ret = setuid(uid);

2276

if(ret == -1){

2277

perror_plus("setuid");

2278

}

2262

2279

2263

2280

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

2264

2281

if(tempdir_created){

2278

2295

}

2279

2296

ret = remove(fullname);

2280

2297

if(ret == -1){

2281

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

2282

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

2298

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

2299

strerror(errno));

2283

2300

}

2284

2301

free(fullname);

2285

2302

}