/mandos/trunk : revision 654

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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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13

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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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#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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139

char *connect_to = NULL;

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140

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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159

unsigned int dh_bits;

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161

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;

180

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va_start (ap, format);

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

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program_invocation_short_name));

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

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

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}

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/*

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}

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

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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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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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return false;

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}

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/* Special case of first server */

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if (mc.current_server == NULL){

228

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 false;

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248

* 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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gpgme_error_t rc;

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gpgme_engine_info_t engine_info;

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/*

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

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*/

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273

return false;

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274

}

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rc = gpgme_op_import(mc.ctx, pgp_data);

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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323

}

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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){

323

328

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

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329

"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,

342

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;

345

351

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;

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if(debug){

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386

gpgme_decrypt_result_t result;

381

result = gpgme_op_decrypt_result(mc.ctx);

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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");

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} else {

462

468

}

463

469

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470

static const char * safer_gnutls_strerror(int value){

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

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-Wunreachable-code */

471

const char *ret = gnutls_strerror(value);

467

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if(ret == NULL)

468

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ret = "(unknown)";

469

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return ret;

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481

}

477

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static int init_gnutls_global(const char *pubkeyfilename,

479

const char *seckeyfilename){

484

const char *seckeyfilename,

485

mandos_context *mc){

480

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int ret;

481

487

482

488

if(debug){

499

505

}

500

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501

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/* OpenPGP credentials */

502

ret = gnutls_certificate_allocate_credentials(&mc.cred);

508

ret = gnutls_certificate_allocate_credentials(&mc->cred);

503

509

if(ret != GNUTLS_E_SUCCESS){

504

510

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

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safer_gnutls_strerror(ret));

515

521

}

516

522

517

523

ret = gnutls_certificate_set_openpgp_key_file

518

(mc.cred, pubkeyfilename, seckeyfilename,

524

(mc->cred, pubkeyfilename, seckeyfilename,

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GNUTLS_OPENPGP_FMT_BASE64);

520

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if(ret != GNUTLS_E_SUCCESS){

521

527

fprintf_plus(stderr,

527

533

}

528

534

529

535

/* GnuTLS server initialization */

530

ret = gnutls_dh_params_init(&mc.dh_params);

536

ret = gnutls_dh_params_init(&mc->dh_params);

531

537

if(ret != GNUTLS_E_SUCCESS){

532

538

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

533

539

" initialization: %s\n",

534

540

safer_gnutls_strerror(ret));

535

541

goto globalfail;

536

542

}

537

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

543

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

538

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if(ret != GNUTLS_E_SUCCESS){

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

540

546

safer_gnutls_strerror(ret));

541

547

goto globalfail;

542

548

}

543

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gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

550

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

545

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return 0;

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548

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globalfail:

549

555

550

gnutls_certificate_free_credentials(mc.cred);

556

gnutls_certificate_free_credentials(mc->cred);

551

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gnutls_global_deinit();

552

gnutls_dh_params_deinit(mc.dh_params);

558

gnutls_dh_params_deinit(mc->dh_params);

553

559

return -1;

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560

}

555

561

556

static int init_gnutls_session(gnutls_session_t *session){

562

static int init_gnutls_session(gnutls_session_t *session,

563

mandos_context *mc){

557

564

int ret;

558

565

/* GnuTLS session creation */

559

566

do {

571

578

{

572

579

const char *err;

573

580

do {

574

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

581

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

575

582

if(quit_now){

576

583

gnutls_deinit(*session);

577

584

return -1;

588

595

589

596

do {

590

597

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

591

mc.cred);

598

mc->cred);

592

599

if(quit_now){

593

600

gnutls_deinit(*session);

594

601

return -1;

604

611

/* ignore client certificate if any. */

605

612

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

606

613

607

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

614

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

608

615

609

616

return 0;

610

617

}

614

621

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

615

622

616

623

/* Called when a Mandos server is found */

617

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

624

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

618

625

AvahiIfIndex if_index,

619

int af){

626

int af, mandos_context *mc){

620

627

int ret, tcp_sd = -1;

621

628

ssize_t sret;

622

629

union {

652

659

return -1;

653

660

}

654

661

655

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);

656

695

if(ret != 0){

657

696

return -1;

658

697

}

659

698

660

699

if(debug){

661

700

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

662

PRIu16 "\n", ip, port);

701

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

663

702

}

664

703

665

704

tcp_sd = socket(pf, SOCK_STREAM, 0);

696

735

goto mandos_end;

697

736

}

698

737

if(af == AF_INET6){

699

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

700

-Wconversion and

701

-Wunreachable-code */

702

738

to.in6.sin6_port = htons(port);

739

#ifdef __GNUC__

740

#pragma GCC diagnostic push

741

#pragma GCC diagnostic ignored "-Wstrict-aliasing"

742

#endif

703

743

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

704

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

705

-Wunreachable-code*/

744

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

745

#ifdef __GNUC__

746

#pragma GCC diagnostic pop

747

#endif

706

748

if(if_index == AVAHI_IF_UNSPEC){

707

749

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

708

750

" incomplete without a network interface\n");

713

755

to.in6.sin6_scope_id = (uint32_t)if_index;

714

756

}

715

757

} else {

716

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

717

-Wconversion and

718

-Wunreachable-code */

758

to.in.sin_port = htons(port);

719

759

}

720

760

721

761

if(quit_now){

729

769

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

730

770

perror_plus("if_indextoname");

731

771

} else {

732

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

733

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

772

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

773

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

734

774

}

735

775

} else {

736

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

737

ip, port);

776

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

777

ip, (uintmax_t)port);

738

778

}

739

779

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

740

780

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

818

858

goto mandos_end;

819

859

}

820

860

821

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

822

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

861

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

862

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

863

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

864

gnutls_transport_set_ptr(session,

865

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

823

866

824

867

if(quit_now){

825

868

errno = EINTR;

930

973

if(buffer_length > 0){

931

974

ssize_t decrypted_buffer_size;

932

975

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

933

&decrypted_buffer);

976

&decrypted_buffer, mc);

934

977

if(decrypted_buffer_size >= 0){

935

978

936

979

written = 0;

997

1040

AVAHI_GCC_UNUSED AvahiStringList *txt,

998

1041

AVAHI_GCC_UNUSED AvahiLookupResultFlags

999

1042

flags,

1000

AVAHI_GCC_UNUSED void* userdata){

1001

assert(r);

1043

void* mc){

1044

if(r == NULL){

1045

return;

1046

}

1002

1047

1003

1048

/* Called whenever a service has been resolved successfully or

1004

1049

timed out */

1013

1058

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

1014

1059

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

1015

1060

domain,

1016

avahi_strerror(avahi_server_errno(mc.server)));

1061

avahi_strerror(avahi_server_errno

1062

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

1017

1063

break;

1018

1064

1019

1065

case AVAHI_RESOLVER_FOUND:

1025

1071

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

1026

1072

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

1027

1073

}

1028

int ret = start_mandos_communication(ip, port, interface,

1029

avahi_proto_to_af(proto));

1074

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

1075

interface,

1076

avahi_proto_to_af(proto),

1077

mc);

1030

1078

if(ret == 0){

1031

avahi_simple_poll_quit(mc.simple_poll);

1079

avahi_simple_poll_quit(simple_poll);

1032

1080

} else {

1033

if(not add_server(ip, port, interface,

1034

avahi_proto_to_af(proto))){

1081

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

1082

avahi_proto_to_af(proto),

1083

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

1035

1084

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

1036

1085

" list\n", name);

1037

1086

}

1050

1099

const char *domain,

1051

1100

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1052

1101

flags,

1053

AVAHI_GCC_UNUSED void* userdata){

1054

assert(b);

1102

void* mc){

1103

if(b == NULL){

1104

return;

1105

}

1055

1106

1056

1107

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

1057

1108

is removed from the LAN */

1065

1116

case AVAHI_BROWSER_FAILURE:

1066

1117

1067

1118

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

1068

avahi_strerror(avahi_server_errno(mc.server)));

1069

avahi_simple_poll_quit(mc.simple_poll);

1119

avahi_strerror(avahi_server_errno

1120

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

1121

avahi_simple_poll_quit(simple_poll);

1070

1122

return;

1071

1123

1072

1124

case AVAHI_BROWSER_NEW:

1075

1127

the callback function is called the Avahi server will free the

1076

1128

resolver for us. */

1077

1129

1078

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

1079

name, type, domain, protocol, 0,

1080

resolve_callback, NULL) == NULL)

1130

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

1131

interface, protocol, name, type,

1132

domain, protocol, 0,

1133

resolve_callback, mc) == NULL)

1081

1134

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

1082

1135

" %s\n", name,

1083

avahi_strerror(avahi_server_errno(mc.server)));

1136

avahi_strerror(avahi_server_errno

1137

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

1084

1138

break;

1085

1139

1086

1140

case AVAHI_BROWSER_REMOVE:

1105

1159

signal_received = sig;

1106

1160

int old_errno = errno;

1107

1161

/* set main loop to exit */

1108

if(mc.simple_poll != NULL){

1109

avahi_simple_poll_quit(mc.simple_poll);

1162

if(simple_poll != NULL){

1163

avahi_simple_poll_quit(simple_poll);

1110

1164

}

1111

1165

errno = old_errno;

1112

1166

}

1113

1167

1114

1168

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

1115

1169

int ret;

1170

error_t ret_errno;

1116

1171

1117

1172

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

1118

1173

if(s < 0){

1174

ret_errno = errno;

1119

1175

perror_plus("socket");

1176

errno = ret_errno;

1120

1177

return false;

1121

1178

}

1122

1179

strcpy(ifr->ifr_name, ifname);

1123

1180

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1124

1181

if(ret == -1){

1125

1182

if(debug){

1183

ret_errno = errno;

1126

1184

perror_plus("ioctl SIOCGIFFLAGS");

1185

errno = ret_errno;

1127

1186

}

1128

1187

return false;

1129

1188

}

1198

1257

}

1199

1258

1200

1259

/*

1201

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

1202

* corresponds to an acceptable network device which is up.

1203

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

1204

*/

1205

int up_interface(const struct dirent *if_entry){

1206

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

1207

return 0;

1208

}

1209

1210

struct ifreq ifr;

1211

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

1212

if(debug){

1213

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

1214

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

1215

}

1216

return 0;

1217

}

1218

1219

/* Reject down interfaces */

1220

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

1221

if(debug){

1222

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

1223

if_entry->d_name);

1224

}

1225

return 0;

1226

}

1227

1228

/* Reject non-running interfaces */

1229

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

1230

if(debug){

1231

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

1232

if_entry->d_name);

1233

}

1234

return 0;

1235

}

1236

1237

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

1238

return 0;

1239

}

1240

return 1;

1260

* This function determines if a network interface is up.

1261

*/

1262

bool interface_is_up(const char *interface){

1263

struct ifreq ifr;

1264

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

1265

if(debug){

1266

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

1267

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

1268

}

1269

return false;

1270

}

1271

1272

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

1273

}

1274

1275

/*

1276

* This function determines if a network interface is running

1277

*/

1278

bool interface_is_running(const char *interface){

1279

struct ifreq ifr;

1280

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

1281

if(debug){

1282

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

1283

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

1284

}

1285

return false;

1286

}

1287

1288

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

1241

1289

}

1242

1290

1243

1291

int notdotentries(const struct dirent *direntry){

1312

1360

return 1;

1313

1361

}

1314

1362

1315

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1363

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1364

mandos_context *mc){

1316

1365

int ret;

1317

1366

struct timespec now;

1318

1367

struct timespec waited_time;

1319

1368

intmax_t block_time;

1320

1369

1321

1370

while(true){

1322

if(mc.current_server == NULL){

1371

if(mc->current_server == NULL){

1323

1372

if (debug){

1324

1373

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

1325

1374

" No timeout!\n");

1339

1388

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

1340

1389

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

1341

1390

waited_time.tv_sec = (now.tv_sec

1342

- mc.current_server->last_seen.tv_sec);

1391

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

1343

1392

waited_time.tv_nsec = (now.tv_nsec

1344

- mc.current_server->last_seen.tv_nsec);

1393

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

1345

1394

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

1346

1395

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

1347

1396

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

1355

1404

}

1356

1405

1357

1406

if(block_time <= 0){

1358

ret = start_mandos_communication(mc.current_server->ip,

1359

mc.current_server->port,

1360

mc.current_server->if_index,

1361

mc.current_server->af);

1407

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

1408

mc->current_server->port,

1409

mc->current_server->if_index,

1410

mc->current_server->af, mc);

1362

1411

if(ret == 0){

1363

avahi_simple_poll_quit(mc.simple_poll);

1412

avahi_simple_poll_quit(s);

1364

1413

return 0;

1365

1414

}

1366

1415

ret = clock_gettime(CLOCK_MONOTONIC,

1367

&mc.current_server->last_seen);

1416

&mc->current_server->last_seen);

1368

1417

if(ret == -1){

1369

1418

perror_plus("clock_gettime");

1370

1419

return -1;

1371

1420

}

1372

mc.current_server = mc.current_server->next;

1421

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

1373

1422

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

1374

1423

servers, but don't block */

1375

1424

}

1384

1433

}

1385

1434

}

1386

1435

1436

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

1437

error_t raise_privileges(void){

1438

error_t old_errno = errno;

1439

error_t ret_errno = 0;

1440

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

1441

ret_errno = errno;

1442

perror_plus("seteuid");

1443

}

1444

errno = old_errno;

1445

return ret_errno;

1446

}

1447

1448

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

1449

error_t raise_privileges_permanently(void){

1450

error_t old_errno = errno;

1451

error_t ret_errno = raise_privileges();

1452

if(ret_errno != 0){

1453

errno = old_errno;

1454

return ret_errno;

1455

}

1456

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

1457

ret_errno = errno;

1458

perror_plus("seteuid");

1459

}

1460

errno = old_errno;

1461

return ret_errno;

1462

}

1463

1464

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

1465

error_t lower_privileges(void){

1466

error_t old_errno = errno;

1467

error_t ret_errno = 0;

1468

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

1469

ret_errno = errno;

1470

perror_plus("seteuid");

1471

}

1472

errno = old_errno;

1473

return ret_errno;

1474

}

1475

1476

/* Lower privileges permanently */

1477

error_t lower_privileges_permanently(void){

1478

error_t old_errno = errno;

1479

error_t ret_errno = 0;

1480

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

1481

ret_errno = errno;

1482

perror_plus("setuid");

1483

}

1484

errno = old_errno;

1485

return ret_errno;

1486

}

1487

1387

1488

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

1388

1489

const float delay){

1389

1490

struct dirent **direntries;

1392

1493

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

1393

1494

alphasort);

1394

1495

if(numhooks == -1){

1395

perror_plus("scandir");

1496

if(errno == ENOENT){

1497

if(debug){

1498

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

1499

" found\n", hookdir);

1500

}

1501

} else {

1502

perror_plus("scandir");

1503

}

1396

1504

} else {

1397

1505

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

1398

1506

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

1411

1519

if(hook_pid == 0){

1412

1520

/* Child */

1413

1521

/* Raise privileges */

1414

errno = 0;

1415

ret = seteuid(0);

1416

if(ret == -1){

1417

perror_plus("seteuid");

1418

}

1419

/* Raise privileges even more */

1420

errno = 0;

1421

ret = setuid(0);

1422

if(ret == -1){

1423

perror_plus("setuid");

1424

}

1522

raise_privileges_permanently();

1425

1523

/* Set group */

1426

1524

errno = 0;

1427

1525

ret = setgid(0);

1447

1545

perror_plus("setenv");

1448

1546

_exit(EX_OSERR);

1449

1547

}

1450

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

1548

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

1451

1549

if(ret == -1){

1452

1550

perror_plus("setenv");

1453

1551

_exit(EX_OSERR);

1470

1568

_exit(EX_OSERR);

1471

1569

}

1472

1570

free(delaystring);

1473

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

1474

perror_plus("execl");

1571

if(connect_to != NULL){

1572

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

1573

if(ret == -1){

1574

perror_plus("setenv");

1575

_exit(EX_OSERR);

1576

}

1577

}

1578

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

1579

perror_plus("execl");

1580

_exit(EXIT_FAILURE);

1581

}

1475

1582

} else {

1476

1583

int status;

1477

1584

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

1511

1618

return true;

1512

1619

}

1513

1620

1621

error_t bring_up_interface(const char *const interface,

1622

const float delay){

1623

int sd = -1;

1624

error_t old_errno = errno;

1625

error_t ret_errno = 0;

1626

int ret, ret_setflags;

1627

struct ifreq network;

1628

unsigned int if_index = if_nametoindex(interface);

1629

if(if_index == 0){

1630

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

1631

errno = old_errno;

1632

return ENXIO;

1633

}

1634

1635

if(quit_now){

1636

errno = old_errno;

1637

return EINTR;

1638

}

1639

1640

if(not interface_is_up(interface)){

1641

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

1642

ret_errno = errno;

1643

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

1644

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

1645

return ret_errno;

1646

}

1647

network.ifr_flags |= IFF_UP;

1648

1649

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1650

if(sd < 0){

1651

ret_errno = errno;

1652

perror_plus("socket");

1653

errno = old_errno;

1654

return ret_errno;

1655

}

1656

1657

if(quit_now){

1658

close(sd);

1659

errno = old_errno;

1660

return EINTR;

1661

}

1662

1663

if(debug){

1664

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

1665

interface);

1666

}

1667

1668

/* Raise priviliges */

1669

raise_privileges();

1670

1671

#ifdef __linux__

1672

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1673

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

1674

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

1675

bool restore_loglevel = true;

1676

if(ret_linux == -1){

1677

restore_loglevel = false;

1678

perror_plus("klogctl");

1679

}

1680

#endif /* __linux__ */

1681

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

1682

ret_errno = errno;

1683

#ifdef __linux__

1684

if(restore_loglevel){

1685

ret_linux = klogctl(7, NULL, 0);

1686

if(ret_linux == -1){

1687

perror_plus("klogctl");

1688

}

1689

}

1690

#endif /* __linux__ */

1691

1692

/* Lower privileges */

1693

lower_privileges();

1694

1695

/* Close the socket */

1696

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

1697

if(ret == -1){

1698

perror_plus("close");

1699

}

1700

1701

if(ret_setflags == -1){

1702

errno = ret_errno;

1703

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1704

errno = old_errno;

1705

return ret_errno;

1706

}

1707

} else if(debug){

1708

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

1709

interface);

1710

}

1711

1712

/* Sleep checking until interface is running.

1713

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

1714

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

1715

if(interface_is_running(interface)){

1716

break;

1717

}

1718

struct timespec sleeptime = { .tv_nsec = 250000000 };

1719

ret = nanosleep(&sleeptime, NULL);

1720

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

1721

perror_plus("nanosleep");

1722

}

1723

}

1724

1725

errno = old_errno;

1726

return 0;

1727

}

1728

1729

error_t take_down_interface(const char *const interface){

1730

int sd = -1;

1731

error_t old_errno = errno;

1732

error_t ret_errno = 0;

1733

int ret, ret_setflags;

1734

struct ifreq network;

1735

unsigned int if_index = if_nametoindex(interface);

1736

if(if_index == 0){

1737

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

1738

errno = old_errno;

1739

return ENXIO;

1740

}

1741

if(interface_is_up(interface)){

1742

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

1743

ret_errno = errno;

1744

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

1745

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

1746

return ret_errno;

1747

}

1748

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

1749

1750

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1751

if(sd < 0){

1752

ret_errno = errno;

1753

perror_plus("socket");

1754

errno = old_errno;

1755

return ret_errno;

1756

}

1757

1758

if(debug){

1759

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

1760

interface);

1761

}

1762

1763

/* Raise priviliges */

1764

raise_privileges();

1765

1766

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

1767

ret_errno = errno;

1768

1769

/* Lower privileges */

1770

lower_privileges();

1771

1772

/* Close the socket */

1773

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

1774

if(ret == -1){

1775

perror_plus("close");

1776

}

1777

1778

if(ret_setflags == -1){

1779

errno = ret_errno;

1780

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1781

errno = old_errno;

1782

return ret_errno;

1783

}

1784

} else if(debug){

1785

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

1786

interface);

1787

}

1788

1789

errno = old_errno;

1790

return 0;

1791

}

1792

1514

1793

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

1794

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

1795

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

1796

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

1797

.interfaces = NULL, .interfaces_size = 0 };

1515

1798

AvahiSServiceBrowser *sb = NULL;

1516

int error;

1799

error_t ret_errno;

1517

1800

int ret;

1518

1801

intmax_t tmpmax;

1519

1802

char *tmp;

1520

1803

int exitcode = EXIT_SUCCESS;

1521

const char *interface = "";

1522

struct ifreq network;

1523

int sd = -1;

1524

bool take_down_interface = false;

1525

uid_t uid;

1526

gid_t gid;

1804

char *interfaces_to_take_down = NULL;

1805

size_t interfaces_to_take_down_size = 0;

1527

1806

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

1528

1807

bool tempdir_created = false;

1529

1808

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1530

1809

const char *seckey = PATHDIR "/" SECKEY;

1531

1810

const char *pubkey = PATHDIR "/" PUBKEY;

1811

char *interfaces_hooks = NULL;

1812

size_t interfaces_hooks_size = 0;

1532

1813

1533

1814

bool gnutls_initialized = false;

1534

1815

bool gpgme_initialized = false;

1596

1877

.group = 2 },

1597

1878

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

1598

1879

.arg = "SECONDS",

1599

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

1880

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

1600

1881

.group = 2 },

1601

1882

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

1602

1883

.arg = "DIR",

1625

1906

connect_to = arg;

1626

1907

break;

1627

1908

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

1628

interface = arg;

1909

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

1910

arg, (int)',');

1911

if(ret_errno != 0){

1912

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

1913

}

1629

1914

break;

1630

1915

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

1631

1916

seckey = arg;

1709

1994

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

1710

1995

1711

1996

/* Re-raise priviliges */

1712

errno = 0;

1713

ret = seteuid(0);

1714

if(ret == -1){

1715

perror_plus("seteuid");

1716

} else {

1997

if(raise_privileges() == 0){

1717

1998

struct stat st;

1718

1999

1719

2000

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

1759

2040

}

1760

2041

1761

2042

/* Lower privileges */

1762

errno = 0;

1763

ret = seteuid(uid);

1764

if(ret == -1){

1765

perror_plus("seteuid");

2043

lower_privileges();

2044

}

2045

}

2046

2047

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

2048

{

2049

char *interface = NULL;

2050

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

2051

interface))){

2052

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

2053

and if_nametoindex(interface) == 0){

2054

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

2055

fprintf_plus(stderr, "Not using nonexisting interface"

2056

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

2057

}

2058

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

2059

interface = NULL;

1766

2060

}

1767

2061

}

1768

2062

}

1769

2063

1770

2064

/* Run network hooks */

1771

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

1772

goto end;

2065

{

2066

if(mc.interfaces != NULL){

2067

interfaces_hooks = malloc(mc.interfaces_size);

2068

if(interfaces_hooks == NULL){

2069

perror_plus("malloc");

2070

goto end;

2071

}

2072

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

2073

interfaces_hooks_size = mc.interfaces_size;

2074

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2075

(int)',');

2076

}

2077

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

2078

interfaces_hooks : "", delay)){

2079

goto end;

2080

}

1773

2081

}

1774

2082

1775

2083

if(not debug){

1776

2084

avahi_set_log_function(empty_log);

1777

2085

}

1778

2086

1779

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

1780

struct dirent **direntries;

1781

/* First look for interfaces that are up */

1782

ret = scandir(sys_class_net, &direntries, up_interface,

1783

alphasort);

1784

if(ret == 0){

1785

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

1786

free(direntries);

1787

ret = scandir(sys_class_net, &direntries, good_interface,

1788

alphasort);

1789

}

1790

if(ret >= 1){

1791

/* Pick the first interface returned */

1792

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

1793

if(debug){

1794

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

1795

}

1796

if(interface == NULL){

1797

perror_plus("malloc");

1798

free(direntries);

1799

exitcode = EXIT_FAILURE;

1800

goto end;

1801

}

1802

free(direntries);

1803

} else {

1804

free(direntries);

1805

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

1806

exitcode = EXIT_FAILURE;

1807

goto end;

1808

}

1809

}

1810

1811

2087

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

1812

2088

from the signal handler */

1813

2089

/* Initialize the pseudo-RNG for Avahi */

1814

2090

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

1815

mc.simple_poll = avahi_simple_poll_new();

1816

if(mc.simple_poll == NULL){

2091

simple_poll = avahi_simple_poll_new();

2092

if(simple_poll == NULL){

1817

2093

fprintf_plus(stderr,

1818

2094

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

1819

2095

exitcode = EX_UNAVAILABLE;

1883

2159

}

1884

2160

}

1885

2161

1886

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

1887

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

1888

if_index = (AvahiIfIndex) if_nametoindex(interface);

1889

if(if_index == 0){

1890

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

1891

exitcode = EX_UNAVAILABLE;

1892

goto end;

1893

}

1894

1895

if(quit_now){

1896

goto end;

1897

}

1898

1899

/* Re-raise priviliges */

1900

errno = 0;

1901

ret = seteuid(0);

1902

if(ret == -1){

1903

perror_plus("seteuid");

1904

}

1905

1906

#ifdef __linux__

1907

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1908

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

1909

ret = klogctl(8, NULL, 5);

1910

bool restore_loglevel = true;

1911

if(ret == -1){

1912

restore_loglevel = false;

1913

perror_plus("klogctl");

1914

}

1915

#endif /* __linux__ */

1916

1917

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1918

if(sd < 0){

1919

perror_plus("socket");

1920

exitcode = EX_OSERR;

1921

#ifdef __linux__

1922

if(restore_loglevel){

1923

ret = klogctl(7, NULL, 0);

1924

if(ret == -1){

1925

perror_plus("klogctl");

1926

}

1927

}

1928

#endif /* __linux__ */

1929

/* Lower privileges */

1930

errno = 0;

1931

ret = seteuid(uid);

1932

if(ret == -1){

1933

perror_plus("seteuid");

1934

}

1935

goto end;

1936

}

1937

strcpy(network.ifr_name, interface);

1938

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

1939

if(ret == -1){

1940

perror_plus("ioctl SIOCGIFFLAGS");

1941

#ifdef __linux__

1942

if(restore_loglevel){

1943

ret = klogctl(7, NULL, 0);

1944

if(ret == -1){

1945

perror_plus("klogctl");

1946

}

1947

}

1948

#endif /* __linux__ */

1949

exitcode = EX_OSERR;

1950

/* Lower privileges */

1951

errno = 0;

1952

ret = seteuid(uid);

1953

if(ret == -1){

1954

perror_plus("seteuid");

1955

}

1956

goto end;

1957

}

1958

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

1959

network.ifr_flags |= IFF_UP;

1960

take_down_interface = true;

1961

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

1962

if(ret == -1){

1963

take_down_interface = false;

1964

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1965

exitcode = EX_OSERR;

1966

#ifdef __linux__

1967

if(restore_loglevel){

1968

ret = klogctl(7, NULL, 0);

1969

if(ret == -1){

1970

perror_plus("klogctl");

2162

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

2163

if(mc.interfaces == NULL){

2164

struct dirent **direntries;

2165

/* Look for any good interfaces */

2166

ret = scandir(sys_class_net, &direntries, good_interface,

2167

alphasort);

2168

if(ret >= 1){

2169

/* Add all found interfaces to interfaces list */

2170

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

2171

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

2172

direntries[i]->d_name);

2173

if(ret_errno != 0){

2174

perror_plus("argz_add");

2175

continue;

2176

}

2177

if(debug){

2178

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

2179

direntries[i]->d_name);

2180

}

2181

}

2182

free(direntries);

2183

} else {

2184

free(direntries);

2185

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

2186

exitcode = EXIT_FAILURE;

2187

goto end;

2188

}

2189

}

2190

2191

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

2192

{

2193

char *interface = NULL;

2194

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

2195

interface))){

2196

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

2197

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

2198

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

2199

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

2200

interface);

2201

interface = NULL;

2202

while((interface = argz_next(mc.interfaces,

2203

mc.interfaces_size, interface))){

2204

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

2205

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

2206

interface);

2207

interface = NULL;

1971

2208

}

1972

2209

}

1973

#endif /* __linux__ */

1974

/* Lower privileges */

1975

errno = 0;

1976

ret = seteuid(uid);

1977

if(ret == -1){

1978

perror_plus("seteuid");

1979

}

1980

goto end;

1981

}

1982

}

1983

/* Sleep checking until interface is running.

1984

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

1985

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

1986

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

1987

if(ret == -1){

1988

perror_plus("ioctl SIOCGIFFLAGS");

1989

} else if(network.ifr_flags & IFF_RUNNING){

1990

2210

break;

1991

2211

}

1992

struct timespec sleeptime = { .tv_nsec = 250000000 };

1993

ret = nanosleep(&sleeptime, NULL);

1994

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

1995

perror_plus("nanosleep");

1996

}

1997

}

1998

if(not take_down_interface){

1999

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

2000

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

2001

if(ret == -1){

2002

perror_plus("close");

2003

}

2004

}

2005

#ifdef __linux__

2006

if(restore_loglevel){

2007

/* Restores kernel loglevel to default */

2008

ret = klogctl(7, NULL, 0);

2009

if(ret == -1){

2010

perror_plus("klogctl");

2011

}

2012

}

2013

#endif /* __linux__ */

2014

/* Lower privileges */

2015

errno = 0;

2016

/* Lower privileges */

2017

ret = seteuid(uid);

2018

if(ret == -1){

2019

perror_plus("seteuid");

2020

}

2212

bool interface_was_up = interface_is_up(interface);

2213

ret = bring_up_interface(interface, delay);

2214

if(not interface_was_up){

2215

if(ret != 0){

2216

errno = ret;

2217

perror_plus("Failed to bring up interface");

2218

} else {

2219

ret_errno = argz_add(&interfaces_to_take_down,

2220

&interfaces_to_take_down_size,

2221

interface);

2222

}

2223

}

2224

}

2225

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

2226

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

2227

}

2228

}

2229

2230

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

2231

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

2232

if(debug){

2233

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

2234

mc.interfaces);

2235

}

2236

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

2021

2237

}

2022

2238

2023

2239

if(quit_now){

2024

2240

goto end;

2025

2241

}

2026

2242

2027

ret = init_gnutls_global(pubkey, seckey);

2243

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

2028

2244

if(ret == -1){

2029

2245

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

2030

2246

exitcode = EX_UNAVAILABLE;

2047

2263

goto end;

2048

2264

}

2049

2265

2050

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

2266

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

2051

2267

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

2052

2268

exitcode = EX_UNAVAILABLE;

2053

2269

goto end;

2063

2279

/* Connect directly, do not use Zeroconf */

2064

2280

/* (Mainly meant for debugging) */

2065

2281

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

2282

2066

2283

if(address == NULL){

2067

2284

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

2068

2285

exitcode = EX_USAGE;

2073

2290

goto end;

2074

2291

}

2075

2292

2076

uint16_t port;

2293

in_port_t port;

2077

2294

errno = 0;

2078

2295

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

2079

2296

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

2080

or tmpmax != (uint16_t)tmpmax){

2297

or tmpmax != (in_port_t)tmpmax){

2081

2298

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

2082

2299

exitcode = EX_USAGE;

2083

2300

goto end;

2084

2301

}

2085

2302

2086

2303

if(quit_now){

2087

2304

goto end;

2088

2305

}

2089

2306

2090

port = (uint16_t)tmpmax;

2307

port = (in_port_t)tmpmax;

2091

2308

*address = '\0';

2092

2309

/* Colon in address indicates IPv6 */

2093

2310

int af;

2109

2326

}

2110

2327

2111

2328

while(not quit_now){

2112

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

2329

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

2330

&mc);

2113

2331

if(quit_now or ret == 0){

2114

2332

break;

2115

2333

}

2117

2335

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

2118

2336

(int)retry_interval);

2119

2337

}

2120

sleep((int)retry_interval);

2338

sleep((unsigned int)retry_interval);

2121

2339

}

2122

2340

2123

2341

if (not quit_now){

2141

2359

config.publish_domain = 0;

2142

2360

2143

2361

/* Allocate a new server */

2144

mc.server = avahi_server_new(avahi_simple_poll_get

2145

(mc.simple_poll), &config, NULL,

2146

NULL, &error);

2362

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2363

&config, NULL, NULL, &ret_errno);

2147

2364

2148

2365

/* Free the Avahi configuration data */

2149

2366

avahi_server_config_free(&config);

2152

2369

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

2153

2370

if(mc.server == NULL){

2154

2371

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

2155

avahi_strerror(error));

2372

avahi_strerror(ret_errno));

2156

2373

exitcode = EX_UNAVAILABLE;

2157

2374

goto end;

2158

2375

}

2164

2381

/* Create the Avahi service browser */

2165

2382

sb = avahi_s_service_browser_new(mc.server, if_index,

2166

2383

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2167

NULL, 0, browse_callback, NULL);

2384

NULL, 0, browse_callback,

2385

(void *)&mc);

2168

2386

if(sb == NULL){

2169

2387

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

2170

2388

avahi_strerror(avahi_server_errno(mc.server)));

2182

2400

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

2183

2401

}

2184

2402

2185

ret = avahi_loop_with_timeout(mc.simple_poll,

2186

(int)(retry_interval * 1000));

2403

ret = avahi_loop_with_timeout(simple_poll,

2404

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

2187

2405

if(debug){

2188

2406

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

2189

2407

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

2196

2414

}

2197

2415

2198

2416

/* Cleanup things */

2417

free(mc.interfaces);

2418

2199

2419

if(sb != NULL)

2200

2420

avahi_s_service_browser_free(sb);

2201

2421

2202

2422

if(mc.server != NULL)

2203

2423

avahi_server_free(mc.server);

2204

2424

2205

if(mc.simple_poll != NULL)

2206

avahi_simple_poll_free(mc.simple_poll);

2425

if(simple_poll != NULL)

2426

avahi_simple_poll_free(simple_poll);

2207

2427

2208

2428

if(gnutls_initialized){

2209

2429

gnutls_certificate_free_credentials(mc.cred);

2226

2446

}

2227

2447

}

2228

2448

2229

/* Run network hooks */

2230

run_network_hooks("stop", interface, delay);

2231

2232

2449

/* Re-raise priviliges */

2233

2450

{

2234

errno = 0;

2235

ret = seteuid(0);

2236

if(ret == -1){

2237

perror_plus("seteuid");

2238

}

2239

2240

/* Take down the network interface */

2241

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

2242

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

2243

if(ret == -1){

2244

perror_plus("ioctl SIOCGIFFLAGS");

2245

} else if(network.ifr_flags & IFF_UP){

2246

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

2247

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

2248

if(ret == -1){

2249

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2451

raise_privileges();

2452

2453

/* Run network hooks */

2454

run_network_hooks("stop", interfaces_hooks != NULL ?

2455

interfaces_hooks : "", delay);

2456

2457

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

2458

{

2459

char *interface = NULL;

2460

while((interface=argz_next(interfaces_to_take_down,

2461

interfaces_to_take_down_size,

2462

interface))){

2463

ret_errno = take_down_interface(interface);

2464

if(ret_errno != 0){

2465

errno = ret_errno;

2466

perror_plus("Failed to take down interface");

2250

2467

}

2251

2468

}

2252

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

2253

if(ret == -1){

2254

perror_plus("close");

2469

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

2470

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

2471

" down\n");

2255

2472

}

2256

2473

}

2257

}

2258

/* Lower privileges permanently */

2259

errno = 0;

2260

ret = setuid(uid);

2261

if(ret == -1){

2262

perror_plus("setuid");

2263

}

2474

2475

lower_privileges_permanently();

2476

}

2477

2478

free(interfaces_to_take_down);

2479

free(interfaces_hooks);

2264

2480

2265

2481

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

2266

2482

if(tempdir_created){