/mandos/trunk : revision 617

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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

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* 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() */

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

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

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strtoimax() */

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#include <assert.h> /* assert() */

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#include <errno.h> /* perror(), errno,

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program_invocation_short_name */

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

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

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argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

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argz_count() */

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#ifdef __linux__

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

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

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char *connect_to = NULL;

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const char *hookdir = HOOKDIR;

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uid_t uid = 65534;

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gid_t gid = 65534;

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

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typedef struct server{

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const char *ip;

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uint16_t port;

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in_port_t port;

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AvahiIfIndex if_index;

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int af;

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struct timespec last_seen;

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

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typedef struct {

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AvahiSimplePoll *simple_poll;

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AvahiServer *server;

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gnutls_certificate_credentials_t cred;

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unsigned int dh_bits;

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const char *priority;

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gpgme_ctx_t ctx;

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server *current_server;

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char *interfaces;

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size_t interfaces_size;

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} mandos_context;

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

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

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.dh_bits = 1024, .priority = "SECURE256"

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

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.current_server = NULL };

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/* global so signal handler can reach it*/

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AvahiSimplePoll *simple_poll;

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sig_atomic_t quit_now = 0;

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int signal_received = 0;

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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)))

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

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va_list ap;

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va_start (ap, format);

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}

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

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

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int af){

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

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int af, server **current_server){

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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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}

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

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.port = port,

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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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if(*current_server == NULL){

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new_server->next = new_server;

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new_server->prev = new_server;

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mc.current_server = new_server;

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*current_server = new_server;

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

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} else {

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new_server->next = mc.current_server;

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

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new_server->next = *current_server;

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

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new_server->prev->next = new_server;

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mc.current_server->prev = new_server;

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(*current_server)->prev = new_server;

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}

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

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

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if(ret == -1){

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perror_plus("clock_gettime");

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return -1;

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return false;

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}

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return 0;

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return true;

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}

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/*

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* Initialize GPGME.

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*/

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

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const char *tempdir){

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const char *tempdir, mandos_context *mc){

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252

gpgme_error_t rc;

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253

gpgme_engine_info_t engine_info;

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254

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249

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/*

250

256

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

251

257

*/

267

273

return false;

268

274

}

269

275

270

rc = gpgme_op_import(mc.ctx, pgp_data);

276

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

271

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if(rc != GPG_ERR_NO_ERROR){

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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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323

}

318

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319

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/* Create new GPGME "context" */

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

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

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if(rc != GPG_ERR_NO_ERROR){

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

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

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344

*/

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static ssize_t pgp_packet_decrypt(const char *cryptotext,

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size_t crypto_size,

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char **plaintext){

347

char **plaintext,

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mandos_context *mc){

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gpgme_data_t dh_crypto, dh_plain;

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gpgme_error_t rc;

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ssize_t ret;

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

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data buffer */

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

380

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

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if(rc != GPG_ERR_NO_ERROR){

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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

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if(debug){

379

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gpgme_decrypt_result_t result;

380

result = gpgme_op_decrypt_result(mc.ctx);

387

result = gpgme_op_decrypt_result(mc->ctx);

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if(result == NULL){

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

383

390

} else {

461

468

}

462

469

463

470

static const char * safer_gnutls_strerror(int value){

464

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

465

-Wunreachable-code */

471

const char *ret = gnutls_strerror(value);

466

472

if(ret == NULL)

467

473

ret = "(unknown)";

468

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return ret;

475

481

}

476

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477

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static int init_gnutls_global(const char *pubkeyfilename,

478

const char *seckeyfilename){

484

const char *seckeyfilename,

485

mandos_context *mc){

479

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int ret;

480

487

481

488

if(debug){

498

505

}

499

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500

507

/* OpenPGP credentials */

501

ret = gnutls_certificate_allocate_credentials(&mc.cred);

508

ret = gnutls_certificate_allocate_credentials(&mc->cred);

502

509

if(ret != GNUTLS_E_SUCCESS){

503

510

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

504

511

safer_gnutls_strerror(ret));

514

521

}

515

522

516

523

ret = gnutls_certificate_set_openpgp_key_file

517

(mc.cred, pubkeyfilename, seckeyfilename,

524

(mc->cred, pubkeyfilename, seckeyfilename,

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GNUTLS_OPENPGP_FMT_BASE64);

519

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if(ret != GNUTLS_E_SUCCESS){

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fprintf_plus(stderr,

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533

}

527

534

528

535

/* GnuTLS server initialization */

529

ret = gnutls_dh_params_init(&mc.dh_params);

536

ret = gnutls_dh_params_init(&mc->dh_params);

530

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if(ret != GNUTLS_E_SUCCESS){

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fprintf_plus(stderr, "Error in GnuTLS DH parameter"

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" initialization: %s\n",

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safer_gnutls_strerror(ret));

534

541

goto globalfail;

535

542

}

536

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

543

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

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if(ret != GNUTLS_E_SUCCESS){

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

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safer_gnutls_strerror(ret));

540

547

goto globalfail;

541

548

}

542

549

543

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

550

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

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545

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return 0;

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547

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globalfail:

548

555

549

gnutls_certificate_free_credentials(mc.cred);

556

gnutls_certificate_free_credentials(mc->cred);

550

557

gnutls_global_deinit();

551

gnutls_dh_params_deinit(mc.dh_params);

558

gnutls_dh_params_deinit(mc->dh_params);

552

559

return -1;

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560

}

554

561

555

static int init_gnutls_session(gnutls_session_t *session){

562

static int init_gnutls_session(gnutls_session_t *session,

563

mandos_context *mc){

556

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int ret;

557

565

/* GnuTLS session creation */

558

566

do {

570

578

{

571

579

const char *err;

572

580

do {

573

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

581

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

574

582

if(quit_now){

575

583

gnutls_deinit(*session);

576

584

return -1;

587

595

588

596

do {

589

597

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

590

mc.cred);

598

mc->cred);

591

599

if(quit_now){

592

600

gnutls_deinit(*session);

593

601

return -1;

603

611

/* ignore client certificate if any. */

604

612

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

605

613

606

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

614

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

607

615

608

616

return 0;

609

617

}

613

621

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

614

622

615

623

/* Called when a Mandos server is found */

616

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

624

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

617

625

AvahiIfIndex if_index,

618

int af){

626

int af, mandos_context *mc){

619

627

int ret, tcp_sd = -1;

620

628

ssize_t sret;

621

629

union {

651

659

return -1;

652

660

}

653

661

654

ret = init_gnutls_session(&session);

662

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

663

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

664

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

665

bool match = false;

666

{

667

char *interface = NULL;

668

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

669

interface))){

670

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

671

match = true;

672

break;

673

}

674

}

675

}

676

if(not match){

677

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

678

connect to the server */

679

if(debug){

680

char interface[IF_NAMESIZE];

681

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

682

perror_plus("if_indextoname");

683

} else {

684

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

685

" \"%s\"\n",

686

if_indextoname((unsigned int)if_index,

687

interface));

688

}

689

}

690

return -1;

691

}

692

}

693

694

ret = init_gnutls_session(&session, mc);

655

695

if(ret != 0){

656

696

return -1;

657

697

}

658

698

659

699

if(debug){

660

700

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

661

PRIu16 "\n", ip, port);

701

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

662

702

}

663

703

664

704

tcp_sd = socket(pf, SOCK_STREAM, 0);

695

735

goto mandos_end;

696

736

}

697

737

if(af == AF_INET6){

698

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

699

-Wconversion and

700

-Wunreachable-code */

701

738

to.in6.sin6_port = htons(port);

702

739

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

703

740

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

704

741

-Wunreachable-code*/

728

765

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

729

766

perror_plus("if_indextoname");

730

767

} else {

731

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

732

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

768

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

769

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

733

770

}

734

771

} else {

735

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

736

ip, port);

772

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

773

ip, (uintmax_t)port);

737

774

}

738

775

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

739

776

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

817

854

goto mandos_end;

818

855

}

819

856

820

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

821

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

857

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

858

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

859

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

860

gnutls_transport_set_ptr(session,

861

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

822

862

823

863

if(quit_now){

824

864

errno = EINTR;

929

969

if(buffer_length > 0){

930

970

ssize_t decrypted_buffer_size;

931

971

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

932

&decrypted_buffer);

972

&decrypted_buffer, mc);

933

973

if(decrypted_buffer_size >= 0){

934

974

935

975

written = 0;

996

1036

AVAHI_GCC_UNUSED AvahiStringList *txt,

997

1037

AVAHI_GCC_UNUSED AvahiLookupResultFlags

998

1038

flags,

999

AVAHI_GCC_UNUSED void* userdata){

1000

assert(r);

1039

void* mc){

1040

if(r == NULL){

1041

return;

1042

}

1001

1043

1002

1044

/* Called whenever a service has been resolved successfully or

1003

1045

timed out */

1012

1054

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

1013

1055

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

1014

1056

domain,

1015

avahi_strerror(avahi_server_errno(mc.server)));

1057

avahi_strerror(avahi_server_errno

1058

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

1016

1059

break;

1017

1060

1018

1061

case AVAHI_RESOLVER_FOUND:

1024

1067

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

1025

1068

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

1026

1069

}

1027

int ret = start_mandos_communication(ip, port, interface,

1028

avahi_proto_to_af(proto));

1070

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

1071

interface,

1072

avahi_proto_to_af(proto),

1073

mc);

1029

1074

if(ret == 0){

1030

avahi_simple_poll_quit(mc.simple_poll);

1075

avahi_simple_poll_quit(simple_poll);

1031

1076

} else {

1032

ret = add_server(ip, port, interface,

1033

avahi_proto_to_af(proto));

1077

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

1078

avahi_proto_to_af(proto),

1079

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

1080

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

1081

" list\n", name);

1082

}

1034

1083

}

1035

1084

}

1036

1085

}

1046

1095

const char *domain,

1047

1096

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1048

1097

flags,

1049

AVAHI_GCC_UNUSED void* userdata){

1050

assert(b);

1098

void* mc){

1099

if(b == NULL){

1100

return;

1101

}

1051

1102

1052

1103

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

1053

1104

is removed from the LAN */

1061

1112

case AVAHI_BROWSER_FAILURE:

1062

1113

1063

1114

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

1064

avahi_strerror(avahi_server_errno(mc.server)));

1065

avahi_simple_poll_quit(mc.simple_poll);

1115

avahi_strerror(avahi_server_errno

1116

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

1117

avahi_simple_poll_quit(simple_poll);

1066

1118

return;

1067

1119

1068

1120

case AVAHI_BROWSER_NEW:

1071

1123

the callback function is called the Avahi server will free the

1072

1124

resolver for us. */

1073

1125

1074

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

1075

name, type, domain, protocol, 0,

1076

resolve_callback, NULL) == NULL)

1126

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

1127

interface, protocol, name, type,

1128

domain, protocol, 0,

1129

resolve_callback, mc) == NULL)

1077

1130

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

1078

1131

" %s\n", name,

1079

avahi_strerror(avahi_server_errno(mc.server)));

1132

avahi_strerror(avahi_server_errno

1133

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

1080

1134

break;

1081

1135

1082

1136

case AVAHI_BROWSER_REMOVE:

1101

1155

signal_received = sig;

1102

1156

int old_errno = errno;

1103

1157

/* set main loop to exit */

1104

if(mc.simple_poll != NULL){

1105

avahi_simple_poll_quit(mc.simple_poll);

1158

if(simple_poll != NULL){

1159

avahi_simple_poll_quit(simple_poll);

1106

1160

}

1107

1161

errno = old_errno;

1108

1162

}

1109

1163

1110

1164

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

1111

1165

int ret;

1166

error_t ret_errno;

1112

1167

1113

1168

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

1114

1169

if(s < 0){

1170

ret_errno = errno;

1115

1171

perror_plus("socket");

1172

errno = ret_errno;

1116

1173

return false;

1117

1174

}

1118

1175

strcpy(ifr->ifr_name, ifname);

1119

1176

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1120

1177

if(ret == -1){

1121

1178

if(debug){

1179

ret_errno = errno;

1122

1180

perror_plus("ioctl SIOCGIFFLAGS");

1181

errno = ret_errno;

1123

1182

}

1124

1183

return false;

1125

1184

}

1194

1253

}

1195

1254

1196

1255

/*

1197

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

1198

* corresponds to an acceptable network device which is up.

1199

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

1200

*/

1201

int up_interface(const struct dirent *if_entry){

1202

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

1203

return 0;

1204

}

1205

1206

struct ifreq ifr;

1207

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

1208

if(debug){

1209

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

1210

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

1211

}

1212

return 0;

1213

}

1214

1215

/* Reject down interfaces */

1216

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

1217

if(debug){

1218

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

1219

if_entry->d_name);

1220

}

1221

return 0;

1222

}

1223

1224

/* Reject non-running interfaces */

1225

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

1226

if(debug){

1227

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

1228

if_entry->d_name);

1229

}

1230

return 0;

1231

}

1232

1233

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

1234

return 0;

1235

}

1236

return 1;

1256

* This function determines if a network interface is up.

1257

*/

1258

bool interface_is_up(const char *interface){

1259

struct ifreq ifr;

1260

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

1261

if(debug){

1262

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

1263

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

1264

}

1265

return false;

1266

}

1267

1268

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

1269

}

1270

1271

/*

1272

* This function determines if a network interface is running

1273

*/

1274

bool interface_is_running(const char *interface){

1275

struct ifreq ifr;

1276

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

1277

if(debug){

1278

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

1279

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

1280

}

1281

return false;

1282

}

1283

1284

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

1237

1285

}

1238

1286

1239

1287

int notdotentries(const struct dirent *direntry){

1308

1356

return 1;

1309

1357

}

1310

1358

1311

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1359

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1360

mandos_context *mc){

1312

1361

int ret;

1313

1362

struct timespec now;

1314

1363

struct timespec waited_time;

1315

1364

intmax_t block_time;

1316

1365

1317

1366

while(true){

1318

if(mc.current_server == NULL){

1367

if(mc->current_server == NULL){

1319

1368

if (debug){

1320

1369

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

1321

1370

" No timeout!\n");

1335

1384

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

1336

1385

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

1337

1386

waited_time.tv_sec = (now.tv_sec

1338

- mc.current_server->last_seen.tv_sec);

1387

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

1339

1388

waited_time.tv_nsec = (now.tv_nsec

1340

- mc.current_server->last_seen.tv_nsec);

1389

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

1341

1390

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

1342

1391

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

1343

1392

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

1351

1400

}

1352

1401

1353

1402

if(block_time <= 0){

1354

ret = start_mandos_communication(mc.current_server->ip,

1355

mc.current_server->port,

1356

mc.current_server->if_index,

1357

mc.current_server->af);

1403

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

1404

mc->current_server->port,

1405

mc->current_server->if_index,

1406

mc->current_server->af, mc);

1358

1407

if(ret == 0){

1359

avahi_simple_poll_quit(mc.simple_poll);

1408

avahi_simple_poll_quit(s);

1360

1409

return 0;

1361

1410

}

1362

1411

ret = clock_gettime(CLOCK_MONOTONIC,

1363

&mc.current_server->last_seen);

1412

&mc->current_server->last_seen);

1364

1413

if(ret == -1){

1365

1414

perror_plus("clock_gettime");

1366

1415

return -1;

1367

1416

}

1368

mc.current_server = mc.current_server->next;

1417

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

1369

1418

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

1370

1419

servers, but don't block */

1371

1420

}

1380

1429

}

1381

1430

}

1382

1431

1432

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

1433

error_t raise_privileges(void){

1434

error_t old_errno = errno;

1435

error_t ret_errno = 0;

1436

if(seteuid(0) == -1){

1437

ret_errno = errno;

1438

perror_plus("seteuid");

1439

}

1440

errno = old_errno;

1441

return ret_errno;

1442

}

1443

1444

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

1445

error_t raise_privileges_permanently(void){

1446

error_t old_errno = errno;

1447

error_t ret_errno = raise_privileges();

1448

if(ret_errno != 0){

1449

errno = old_errno;

1450

return ret_errno;

1451

}

1452

if(setuid(0) == -1){

1453

ret_errno = errno;

1454

perror_plus("seteuid");

1455

}

1456

errno = old_errno;

1457

return ret_errno;

1458

}

1459

1460

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

1461

error_t lower_privileges(void){

1462

error_t old_errno = errno;

1463

error_t ret_errno = 0;

1464

if(seteuid(uid) == -1){

1465

ret_errno = errno;

1466

perror_plus("seteuid");

1467

}

1468

errno = old_errno;

1469

return ret_errno;

1470

}

1471

1472

/* Lower privileges permanently */

1473

error_t lower_privileges_permanently(void){

1474

error_t old_errno = errno;

1475

error_t ret_errno = 0;

1476

if(setuid(uid) == -1){

1477

ret_errno = errno;

1478

perror_plus("setuid");

1479

}

1480

errno = old_errno;

1481

return ret_errno;

1482

}

1483

1383

1484

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

1384

1485

const float delay){

1385

1486

struct dirent **direntries;

1388

1489

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

1389

1490

alphasort);

1390

1491

if(numhooks == -1){

1391

perror_plus("scandir");

1492

if(errno == ENOENT){

1493

if(debug){

1494

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

1495

" found\n", hookdir);

1496

}

1497

} else {

1498

perror_plus("scandir");

1499

}

1392

1500

} else {

1393

1501

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

1394

1502

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

1406

1514

pid_t hook_pid = fork();

1407

1515

if(hook_pid == 0){

1408

1516

/* Child */

1517

/* Raise privileges */

1518

raise_privileges_permanently();

1519

/* Set group */

1520

errno = 0;

1521

ret = setgid(0);

1522

if(ret == -1){

1523

perror_plus("setgid");

1524

}

1525

/* Reset supplementary groups */

1526

errno = 0;

1527

ret = setgroups(0, NULL);

1528

if(ret == -1){

1529

perror_plus("setgroups");

1530

}

1409

1531

dup2(devnull, STDIN_FILENO);

1410

1532

close(devnull);

1411

1533

dup2(STDERR_FILENO, STDOUT_FILENO);

1412

1534

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

1413

1535

if(ret == -1){

1414

1536

perror_plus("setenv");

1415

return false;

1537

_exit(EX_OSERR);

1416

1538

}

1417

1539

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

1418

1540

if(ret == -1){

1419

1541

perror_plus("setenv");

1420

return false;

1542

_exit(EX_OSERR);

1421

1543

}

1422

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

1544

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

1423

1545

if(ret == -1){

1424

1546

perror_plus("setenv");

1425

return false;

1547

_exit(EX_OSERR);

1426

1548

}

1427

1549

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

1428

1550

if(ret == -1){

1429

1551

perror_plus("setenv");

1430

return false;

1552

_exit(EX_OSERR);

1431

1553

}

1432

1554

char *delaystring;

1433

1555

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

1434

1556

if(ret == -1){

1435

1557

perror_plus("asprintf");

1436

return false;

1558

_exit(EX_OSERR);

1437

1559

}

1438

1560

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

1439

1561

if(ret == -1){

1440

1562

free(delaystring);

1441

1563

perror_plus("setenv");

1442

return false;

1564

_exit(EX_OSERR);

1443

1565

}

1444

1566

free(delaystring);

1445

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

1446

perror_plus("execl");

1567

if(connect_to != NULL){

1568

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

1569

if(ret == -1){

1570

perror_plus("setenv");

1571

_exit(EX_OSERR);

1572

}

1573

}

1574

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

1575

perror_plus("execl");

1576

_exit(EXIT_FAILURE);

1577

}

1447

1578

} else {

1448

1579

int status;

1449

1580

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

1483

1614

return true;

1484

1615

}

1485

1616

1617

error_t bring_up_interface(const char *const interface,

1618

const float delay){

1619

int sd = -1;

1620

error_t old_errno = errno;

1621

error_t ret_errno = 0;

1622

int ret, ret_setflags;

1623

struct ifreq network;

1624

unsigned int if_index = if_nametoindex(interface);

1625

if(if_index == 0){

1626

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

1627

errno = old_errno;

1628

return ENXIO;

1629

}

1630

1631

if(quit_now){

1632

errno = old_errno;

1633

return EINTR;

1634

}

1635

1636

if(not interface_is_up(interface)){

1637

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

1638

ret_errno = errno;

1639

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

1640

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

1641

return ret_errno;

1642

}

1643

network.ifr_flags |= IFF_UP;

1644

1645

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1646

if(sd < 0){

1647

ret_errno = errno;

1648

perror_plus("socket");

1649

errno = old_errno;

1650

return ret_errno;

1651

}

1652

1653

if(quit_now){

1654

close(sd);

1655

errno = old_errno;

1656

return EINTR;

1657

}

1658

1659

if(debug){

1660

fprintf_plus(stderr, "Bringing up interface \"%s\"\n",

1661

interface);

1662

}

1663

1664

/* Raise priviliges */

1665

raise_privileges();

1666

1667

#ifdef __linux__

1668

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1669

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

1670

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

1671

bool restore_loglevel = true;

1672

if(ret_linux == -1){

1673

restore_loglevel = false;

1674

perror_plus("klogctl");

1675

}

1676

#endif /* __linux__ */

1677

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

1678

ret_errno = errno;

1679

#ifdef __linux__

1680

if(restore_loglevel){

1681

ret_linux = klogctl(7, NULL, 0);

1682

if(ret_linux == -1){

1683

perror_plus("klogctl");

1684

}

1685

}

1686

#endif /* __linux__ */

1687

1688

/* Lower privileges */

1689

lower_privileges();

1690

1691

/* Close the socket */

1692

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

1693

if(ret == -1){

1694

perror_plus("close");

1695

}

1696

1697

if(ret_setflags == -1){

1698

errno = ret_errno;

1699

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1700

errno = old_errno;

1701

return ret_errno;

1702

}

1703

} else if(debug){

1704

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

1705

interface);

1706

}

1707

1708

/* Sleep checking until interface is running.

1709

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

1710

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

1711

if(interface_is_running(interface)){

1712

break;

1713

}

1714

struct timespec sleeptime = { .tv_nsec = 250000000 };

1715

ret = nanosleep(&sleeptime, NULL);

1716

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

1717

perror_plus("nanosleep");

1718

}

1719

}

1720

1721

errno = old_errno;

1722

return 0;

1723

}

1724

1725

error_t take_down_interface(const char *const interface){

1726

int sd = -1;

1727

error_t old_errno = errno;

1728

error_t ret_errno = 0;

1729

int ret, ret_setflags;

1730

struct ifreq network;

1731

unsigned int if_index = if_nametoindex(interface);

1732

if(if_index == 0){

1733

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

1734

errno = old_errno;

1735

return ENXIO;

1736

}

1737

if(interface_is_up(interface)){

1738

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

1739

ret_errno = errno;

1740

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

1741

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

1742

return ret_errno;

1743

}

1744

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

1745

1746

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1747

if(sd < 0){

1748

ret_errno = errno;

1749

perror_plus("socket");

1750

errno = old_errno;

1751

return ret_errno;

1752

}

1753

1754

if(debug){

1755

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

1756

interface);

1757

}

1758

1759

/* Raise priviliges */

1760

raise_privileges();

1761

1762

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

1763

ret_errno = errno;

1764

1765

/* Lower privileges */

1766

lower_privileges();

1767

1768

/* Close the socket */

1769

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

1770

if(ret == -1){

1771

perror_plus("close");

1772

}

1773

1774

if(ret_setflags == -1){

1775

errno = ret_errno;

1776

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1777

errno = old_errno;

1778

return ret_errno;

1779

}

1780

} else if(debug){

1781

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

1782

interface);

1783

}

1784

1785

errno = old_errno;

1786

return 0;

1787

}

1788

1486

1789

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

1790

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

1791

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

1792

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

1793

.interfaces = NULL, .interfaces_size = 0 };

1487

1794

AvahiSServiceBrowser *sb = NULL;

1488

int error;

1795

error_t ret_errno;

1489

1796

int ret;

1490

1797

intmax_t tmpmax;

1491

1798

char *tmp;

1492

1799

int exitcode = EXIT_SUCCESS;

1493

const char *interface = "";

1494

struct ifreq network;

1495

int sd = -1;

1496

bool take_down_interface = false;

1497

uid_t uid;

1498

gid_t gid;

1800

char *interfaces_to_take_down = NULL;

1801

size_t interfaces_to_take_down_size = 0;

1499

1802

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

1500

1803

bool tempdir_created = false;

1501

1804

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1502

1805

const char *seckey = PATHDIR "/" SECKEY;

1503

1806

const char *pubkey = PATHDIR "/" PUBKEY;

1807

char *interfaces_hooks = NULL;

1808

size_t interfaces_hooks_size = 0;

1504

1809

1505

1810

bool gnutls_initialized = false;

1506

1811

bool gpgme_initialized = false;

1568

1873

.group = 2 },

1569

1874

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

1570

1875

.arg = "SECONDS",

1571

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

1876

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

1572

1877

.group = 2 },

1573

1878

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

1574

1879

.arg = "DIR",

1597

1902

connect_to = arg;

1598

1903

break;

1599

1904

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

1600

interface = arg;

1905

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

1906

arg, (int)',');

1907

if(ret_errno != 0){

1908

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

1909

}

1601

1910

break;

1602

1911

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

1603

1912

seckey = arg;

1646

1955

argp_state_help(state, state->out_stream,

1647

1956

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1648

1957

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

1649

fprintf_plus(state->out_stream,

1650

"Mandos plugin mandos-client: ");

1651

1958

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

1652

1959

exit(argp_err_exit_status);

1653

1960

break;

1678

1985

}

1679

1986

}

1680

1987

1681

if(getuid() == 0){

1988

{

1682

1989

/* Work around Debian bug #633582:

1683

1990

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

1684

struct stat st;

1685

1991

1686

1992

/* Re-raise priviliges */

1687

errno = 0;

1688

ret = seteuid(0);

1689

if(ret == -1){

1690

perror_plus("seteuid");

1691

}

1692

1693

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

1694

int seckey_fd = open(seckey, O_RDONLY);

1695

if(seckey_fd == -1){

1696

perror_plus("open");

1697

} else {

1698

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

1699

if(ret == -1){

1700

perror_plus("fstat");

1701

} else {

1702

if(S_ISREG(st.st_mode)

1703

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

1704

ret = fchown(seckey_fd, uid, gid);

1705

if(ret == -1){

1706

perror_plus("fchown");

1707

}

1708

}

1709

}

1710

TEMP_FAILURE_RETRY(close(seckey_fd));

1711

}

1712

}

1713

1714

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

1715

int pubkey_fd = open(pubkey, O_RDONLY);

1716

if(pubkey_fd == -1){

1717

perror_plus("open");

1718

} else {

1719

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

1720

if(ret == -1){

1721

perror_plus("fstat");

1722

} else {

1723

if(S_ISREG(st.st_mode)

1724

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

1725

ret = fchown(pubkey_fd, uid, gid);

1726

if(ret == -1){

1727

perror_plus("fchown");

1728

}

1729

}

1730

}

1731

TEMP_FAILURE_RETRY(close(pubkey_fd));

1732

}

1733

}

1734

1735

/* Lower privileges */

1736

errno = 0;

1737

ret = seteuid(uid);

1738

if(ret == -1){

1739

perror_plus("seteuid");

1993

if(raise_privileges() == 0){

1994

struct stat st;

1995

1996

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

1997

int seckey_fd = open(seckey, O_RDONLY);

1998

if(seckey_fd == -1){

1999

perror_plus("open");

2000

} else {

2001

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

2002

if(ret == -1){

2003

perror_plus("fstat");

2004

} else {

2005

if(S_ISREG(st.st_mode)

2006

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

2007

ret = fchown(seckey_fd, uid, gid);

2008

if(ret == -1){

2009

perror_plus("fchown");

2010

}

2011

}

2012

}

2013

TEMP_FAILURE_RETRY(close(seckey_fd));

2014

}

2015

}

2016

2017

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

2018

int pubkey_fd = open(pubkey, O_RDONLY);

2019

if(pubkey_fd == -1){

2020

perror_plus("open");

2021

} else {

2022

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

2023

if(ret == -1){

2024

perror_plus("fstat");

2025

} else {

2026

if(S_ISREG(st.st_mode)

2027

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

2028

ret = fchown(pubkey_fd, uid, gid);

2029

if(ret == -1){

2030

perror_plus("fchown");

2031

}

2032

}

2033

}

2034

TEMP_FAILURE_RETRY(close(pubkey_fd));

2035

}

2036

}

2037

2038

/* Lower privileges */

2039

lower_privileges();

2040

}

2041

}

2042

2043

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

2044

{

2045

char *interface = NULL;

2046

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

2047

interface))){

2048

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

2049

and if_nametoindex(interface) == 0){

2050

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

2051

fprintf_plus(stderr, "Not using nonexisting interface"

2052

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

2053

}

2054

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

2055

interface = NULL;

2056

}

1740

2057

}

1741

2058

}

1742

2059

1743

2060

/* Run network hooks */

1744

2061

{

1745

if(getuid() == 0){

1746

/* Re-raise priviliges */

1747

errno = 0;

1748

ret = seteuid(0);

1749

if(ret == -1){

1750

perror_plus("seteuid");

2062

if(mc.interfaces != NULL){

2063

interfaces_hooks = malloc(mc.interfaces_size);

2064

if(interfaces_hooks == NULL){

2065

perror_plus("malloc");

2066

goto end;

1751

2067

}

2068

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

2069

interfaces_hooks_size = mc.interfaces_size;

2070

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2071

(int)',');

1752

2072

}

1753

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

2073

if(not run_network_hooks("start", interfaces_hooks != NULL ?

2074

interfaces_hooks : "", delay)){

1754

2075

goto end;

1755

2076

}

1756

if(getuid() == 0){

1757

/* Lower privileges */

1758

errno = 0;

1759

ret = seteuid(uid);

1760

if(ret == -1){

1761

perror_plus("seteuid");

1762

}

1763

}

1764

2077

}

1765

2078

1766

2079

if(not debug){

1767

2080

avahi_set_log_function(empty_log);

1768

2081

}

1769

2082

1770

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

1771

struct dirent **direntries;

1772

/* First look for interfaces that are up */

1773

ret = scandir(sys_class_net, &direntries, up_interface,

1774

alphasort);

1775

if(ret == 0){

1776

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

1777

free(direntries);

1778

ret = scandir(sys_class_net, &direntries, good_interface,

1779

alphasort);

1780

}

1781

if(ret >= 1){

1782

/* Pick the first interface returned */

1783

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

1784

if(debug){

1785

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

1786

}

1787

if(interface == NULL){

1788

perror_plus("malloc");

1789

free(direntries);

1790

exitcode = EXIT_FAILURE;

1791

goto end;

1792

}

1793

free(direntries);

1794

} else {

1795

free(direntries);

1796

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

1797

exitcode = EXIT_FAILURE;

1798

goto end;

1799

}

1800

}

1801

1802

2083

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

1803

2084

from the signal handler */

1804

2085

/* Initialize the pseudo-RNG for Avahi */

1805

2086

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

1806

mc.simple_poll = avahi_simple_poll_new();

1807

if(mc.simple_poll == NULL){

2087

simple_poll = avahi_simple_poll_new();

2088

if(simple_poll == NULL){

1808

2089

fprintf_plus(stderr,

1809

2090

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

1810

2091

exitcode = EX_UNAVAILABLE;

1874

2155

}

1875

2156

}

1876

2157

1877

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

1878

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

1879

if_index = (AvahiIfIndex) if_nametoindex(interface);

1880

if(if_index == 0){

1881

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

1882

exitcode = EX_UNAVAILABLE;

1883

goto end;

1884

}

1885

1886

if(quit_now){

1887

goto end;

1888

}

1889

1890

/* Re-raise priviliges */

1891

errno = 0;

1892

ret = seteuid(0);

1893

if(ret == -1){

1894

perror_plus("seteuid");

1895

}

1896

1897

#ifdef __linux__

1898

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1899

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

1900

ret = klogctl(8, NULL, 5);

1901

bool restore_loglevel = true;

1902

if(ret == -1){

1903

restore_loglevel = false;

1904

perror_plus("klogctl");

1905

}

1906

#endif /* __linux__ */

1907

1908

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1909

if(sd < 0){

1910

perror_plus("socket");

1911

exitcode = EX_OSERR;

1912

#ifdef __linux__

1913

if(restore_loglevel){

1914

ret = klogctl(7, NULL, 0);

1915

if(ret == -1){

1916

perror_plus("klogctl");

1917

}

1918

}

1919

#endif /* __linux__ */

1920

/* Lower privileges */

1921

errno = 0;

1922

ret = seteuid(uid);

1923

if(ret == -1){

1924

perror_plus("seteuid");

1925

}

1926

goto end;

1927

}

1928

strcpy(network.ifr_name, interface);

1929

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

1930

if(ret == -1){

1931

perror_plus("ioctl SIOCGIFFLAGS");

1932

#ifdef __linux__

1933

if(restore_loglevel){

1934

ret = klogctl(7, NULL, 0);

1935

if(ret == -1){

1936

perror_plus("klogctl");

1937

}

1938

}

1939

#endif /* __linux__ */

1940

exitcode = EX_OSERR;

1941

/* Lower privileges */

1942

errno = 0;

1943

ret = seteuid(uid);

1944

if(ret == -1){

1945

perror_plus("seteuid");

1946

}

1947

goto end;

1948

}

1949

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

1950

network.ifr_flags |= IFF_UP;

1951

take_down_interface = true;

1952

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

1953

if(ret == -1){

1954

take_down_interface = false;

1955

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1956

exitcode = EX_OSERR;

1957

#ifdef __linux__

1958

if(restore_loglevel){

1959

ret = klogctl(7, NULL, 0);

1960

if(ret == -1){

1961

perror_plus("klogctl");

2158

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

2159

if(mc.interfaces == NULL){

2160

struct dirent **direntries;

2161

/* Look for any good interfaces */

2162

ret = scandir(sys_class_net, &direntries, good_interface,

2163

alphasort);

2164

if(ret >= 1){

2165

/* Add all found interfaces to interfaces list */

2166

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

2167

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

2168

direntries[i]->d_name);

2169

if(ret_errno != 0){

2170

perror_plus("argz_add");

2171

continue;

2172

}

2173

if(debug){

2174

fprintf_plus(stderr, "Will use interface \"%s\"\n",

2175

direntries[i]->d_name);

2176

}

2177

}

2178

free(direntries);

2179

} else {

2180

free(direntries);

2181

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

2182

exitcode = EXIT_FAILURE;

2183

goto end;

2184

}

2185

}

2186

2187

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

2188

{

2189

char *interface = NULL;

2190

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

2191

interface))){

2192

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

2193

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

2194

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

2195

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

2196

interface);

2197

interface = NULL;

2198

while((interface = argz_next(mc.interfaces,

2199

mc.interfaces_size, interface))){

2200

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

2201

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

2202

interface);

2203

interface = NULL;

1962

2204

}

1963

2205

}

1964

#endif /* __linux__ */

1965

/* Lower privileges */

1966

errno = 0;

1967

ret = seteuid(uid);

1968

if(ret == -1){

1969

perror_plus("seteuid");

1970

}

1971

goto end;

1972

}

1973

}

1974

/* Sleep checking until interface is running.

1975

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

1976

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

1977

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

1978

if(ret == -1){

1979

perror_plus("ioctl SIOCGIFFLAGS");

1980

} else if(network.ifr_flags & IFF_RUNNING){

1981

2206

break;

1982

2207

}

1983

struct timespec sleeptime = { .tv_nsec = 250000000 };

1984

ret = nanosleep(&sleeptime, NULL);

1985

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

1986

perror_plus("nanosleep");

1987

}

1988

}

1989

if(not take_down_interface){

1990

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

1991

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

1992

if(ret == -1){

1993

perror_plus("close");

1994

}

1995

}

1996

#ifdef __linux__

1997

if(restore_loglevel){

1998

/* Restores kernel loglevel to default */

1999

ret = klogctl(7, NULL, 0);

2000

if(ret == -1){

2001

perror_plus("klogctl");

2002

}

2003

}

2004

#endif /* __linux__ */

2005

/* Lower privileges */

2006

errno = 0;

2007

/* Lower privileges */

2008

ret = seteuid(uid);

2009

if(ret == -1){

2010

perror_plus("seteuid");

2011

}

2208

bool interface_was_up = interface_is_up(interface);

2209

ret = bring_up_interface(interface, delay);

2210

if(not interface_was_up){

2211

if(ret != 0){

2212

errno = ret;

2213

perror_plus("Failed to bring up interface");

2214

} else {

2215

ret_errno = argz_add(&interfaces_to_take_down,

2216

&interfaces_to_take_down_size,

2217

interface);

2218

}

2219

}

2220

}

2221

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

2222

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

2223

}

2224

}

2225

2226

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

2227

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

2228

if(debug){

2229

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

2230

mc.interfaces);

2231

}

2232

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

2012

2233

}

2013

2234

2014

2235

if(quit_now){

2015

2236

goto end;

2016

2237

}

2017

2238

2018

ret = init_gnutls_global(pubkey, seckey);

2239

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

2019

2240

if(ret == -1){

2020

2241

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

2021

2242

exitcode = EX_UNAVAILABLE;

2038

2259

goto end;

2039

2260

}

2040

2261

2041

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

2262

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

2042

2263

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

2043

2264

exitcode = EX_UNAVAILABLE;

2044

2265

goto end;

2054

2275

/* Connect directly, do not use Zeroconf */

2055

2276

/* (Mainly meant for debugging) */

2056

2277

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

2278

2057

2279

if(address == NULL){

2058

2280

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

2059

2281

exitcode = EX_USAGE;

2064

2286

goto end;

2065

2287

}

2066

2288

2067

uint16_t port;

2289

in_port_t port;

2068

2290

errno = 0;

2069

2291

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

2070

2292

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

2071

or tmpmax != (uint16_t)tmpmax){

2293

or tmpmax != (in_port_t)tmpmax){

2072

2294

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

2073

2295

exitcode = EX_USAGE;

2074

2296

goto end;

2075

2297

}

2076

2298

2077

2299

if(quit_now){

2078

2300

goto end;

2079

2301

}

2080

2302

2081

port = (uint16_t)tmpmax;

2303

port = (in_port_t)tmpmax;

2082

2304

*address = '\0';

2083

2305

/* Colon in address indicates IPv6 */

2084

2306

int af;

2100

2322

}

2101

2323

2102

2324

while(not quit_now){

2103

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

2325

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

2326

&mc);

2104

2327

if(quit_now or ret == 0){

2105

2328

break;

2106

2329

}

2132

2355

config.publish_domain = 0;

2133

2356

2134

2357

/* Allocate a new server */

2135

mc.server = avahi_server_new(avahi_simple_poll_get

2136

(mc.simple_poll), &config, NULL,

2137

NULL, &error);

2358

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2359

&config, NULL, NULL, &ret_errno);

2138

2360

2139

2361

/* Free the Avahi configuration data */

2140

2362

avahi_server_config_free(&config);

2143

2365

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

2144

2366

if(mc.server == NULL){

2145

2367

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

2146

avahi_strerror(error));

2368

avahi_strerror(ret_errno));

2147

2369

exitcode = EX_UNAVAILABLE;

2148

2370

goto end;

2149

2371

}

2155

2377

/* Create the Avahi service browser */

2156

2378

sb = avahi_s_service_browser_new(mc.server, if_index,

2157

2379

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2158

NULL, 0, browse_callback, NULL);

2380

NULL, 0, browse_callback,

2381

(void *)&mc);

2159

2382

if(sb == NULL){

2160

2383

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

2161

2384

avahi_strerror(avahi_server_errno(mc.server)));

2173

2396

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

2174

2397

}

2175

2398

2176

ret = avahi_loop_with_timeout(mc.simple_poll,

2177

(int)(retry_interval * 1000));

2399

ret = avahi_loop_with_timeout(simple_poll,

2400

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

2178

2401

if(debug){

2179

2402

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

2180

2403

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

2187

2410

}

2188

2411

2189

2412

/* Cleanup things */

2413

free(mc.interfaces);

2414

2190

2415

if(sb != NULL)

2191

2416

avahi_s_service_browser_free(sb);

2192

2417

2193

2418

if(mc.server != NULL)

2194

2419

avahi_server_free(mc.server);

2195

2420

2196

if(mc.simple_poll != NULL)

2197

avahi_simple_poll_free(mc.simple_poll);

2421

if(simple_poll != NULL)

2422

avahi_simple_poll_free(simple_poll);

2198

2423

2199

2424

if(gnutls_initialized){

2200

2425

gnutls_certificate_free_credentials(mc.cred);

2219

2444

2220

2445

/* Re-raise priviliges */

2221

2446

{

2222

if(getuid() == 0){

2223

errno = 0;

2224

ret = seteuid(0);

2225

if(ret == -1){

2226

perror_plus("seteuid");

2227

}

2228

}

2447

raise_privileges();

2229

2448

2230

2449

/* Run network hooks */

2231

run_network_hooks("stop", interface, delay);

2450

run_network_hooks("stop", interfaces_hooks != NULL ?

2451

interfaces_hooks : "", delay);

2232

2452

2233

/* Take down the network interface */

2234

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

2235

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

2236

if(ret == -1){

2237

perror_plus("ioctl SIOCGIFFLAGS");

2238

} else if(network.ifr_flags & IFF_UP){

2239

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

2240

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

2241

if(ret == -1){

2242

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2453

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

2454

{

2455

char *interface = NULL;

2456

while((interface=argz_next(interfaces_to_take_down,

2457

interfaces_to_take_down_size,

2458

interface))){

2459

ret_errno = take_down_interface(interface);

2460

if(ret_errno != 0){

2461

errno = ret_errno;

2462

perror_plus("Failed to take down interface");

2243

2463

}

2244

2464

}

2245

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

2246

if(ret == -1){

2247

perror_plus("close");

2465

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

2466

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

2467

" down\n");

2248

2468

}

2249

2469

}

2250

}

2251

if(getuid() == 0){

2252

/* Lower privileges permanently */

2253

errno = 0;

2254

ret = setuid(uid);

2255

if(ret == -1){

2256

perror_plus("setuid");

2257

}

2258

}

2470

2471

lower_privileges_permanently();

2472

}

2473

2474

free(interfaces_to_take_down);

2475

free(interfaces_hooks);

2259

2476

2260

2477

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

2261

2478

if(tempdir_created){