/mandos/trunk : revision 505.2.6

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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, intptr_t */

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#include <stdint.h> /* uint16_t, uint32_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(), _exit() */

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setgid(), pause() */

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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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137

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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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in_port_t port;

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uint16_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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159

} mandos_context;

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160

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/* global so signal handler can reach it*/

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AvahiSimplePoll *simple_poll;

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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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sig_atomic_t quit_now = 0;

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int signal_received = 0;

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169

174

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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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177

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

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program_invocation_short_name));

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TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ", program_invocation_short_name));

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

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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, in_port_t port, AvahiIfIndex if_index,

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int af, server **current_server){

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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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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 false;

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return -1;

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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 false;

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return -1;

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}

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/* Special case of first server */

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if(*current_server == NULL){

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if (mc.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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*current_server = new_server;

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mc.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 = *current_server;

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

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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->prev->next = new_server;

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(*current_server)->prev = new_server;

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mc.current_server->prev = new_server;

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}

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

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

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if(ret == -1){

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233

perror_plus("clock_gettime");

242

return false;

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return -1;

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235

}

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return true;

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return 0;

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237

}

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238

247

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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, mandos_context *mc){

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const char *tempdir){

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gpgme_error_t rc;

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245

gpgme_engine_info_t engine_info;

254

246

247

255

248

/*

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

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250

*/

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

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if(rc != GPG_ERR_NO_ERROR){

271

264

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

274

267

}

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268

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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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270

if(rc != GPG_ERR_NO_ERROR){

278

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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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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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274

}

282

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rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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295

}

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305

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rc = gpgme_get_engine_info(&engine_info);

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if(rc != GPG_ERR_NO_ERROR){

307

300

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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gpgme_strsource(rc), gpgme_strerror(rc));

309

302

return false;

310

303

}

311

304

while(engine_info != NULL){

317

310

engine_info = engine_info->next;

318

311

}

319

312

if(engine_info == NULL){

320

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

321

tempdir);

313

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

322

314

return false;

323

315

}

324

316

325

317

/* Create new GPGME "context" */

326

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

318

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

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319

if(rc != GPG_ERR_NO_ERROR){

328

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

329

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

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gpgme_strerror(rc));

321

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

322

gpgme_strerror(rc));

331

323

return false;

332

324

}

333

325

344

336

*/

345

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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,

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mandos_context *mc){

339

char **plaintext){

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gpgme_data_t dh_crypto, dh_plain;

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gpgme_error_t rc;

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342

ssize_t ret;

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0);

362

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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gpgme_strsource(rc), gpgme_strerror(rc));

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return -1;

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357

}

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rc = gpgme_data_new(&dh_plain);

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if(rc != GPG_ERR_NO_ERROR){

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362

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

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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gpgme_data_release(dh_crypto);

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366

return -1;

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367

}

377

368

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

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data buffer */

380

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

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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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gpgme_strsource(rc), gpgme_strerror(rc));

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plaintext_length = -1;

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if(debug){

386

377

gpgme_decrypt_result_t result;

387

result = gpgme_op_decrypt_result(mc->ctx);

378

result = gpgme_op_decrypt_result(mc.ctx);

388

379

if(result == NULL){

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380

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

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381

} else {

391

382

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

392

result->unsupported_algorithm);

383

result->unsupported_algorithm);

393

384

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

394

result->wrong_key_usage);

385

result->wrong_key_usage);

395

386

if(result->file_name != NULL){

396

387

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

397

388

}

399

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recipient = result->recipients;

400

391

while(recipient != NULL){

401

392

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

402

gpgme_pubkey_algo_name

403

(recipient->pubkey_algo));

393

gpgme_pubkey_algo_name(recipient->pubkey_algo));

404

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

405

395

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

406

recipient->status == GPG_ERR_NO_SECKEY

407

? "No" : "Yes");

396

recipient->status == GPG_ERR_NO_SECKEY

397

? "No" : "Yes");

408

398

recipient = recipient->next;

409

399

}

410

400

}

468

458

}

469

459

470

460

static const char * safer_gnutls_strerror(int value){

471

const char *ret = gnutls_strerror(value);

461

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

462

-Wunreachable-code */

472

463

if(ret == NULL)

473

464

ret = "(unknown)";

474

465

return ret;

481

472

}

482

473

483

474

static int init_gnutls_global(const char *pubkeyfilename,

484

const char *seckeyfilename,

485

mandos_context *mc){

475

const char *seckeyfilename){

486

476

int ret;

487

477

488

478

if(debug){

491

481

492

482

ret = gnutls_global_init();

493

483

if(ret != GNUTLS_E_SUCCESS){

494

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

495

safer_gnutls_strerror(ret));

484

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

496

485

return -1;

497

486

}

498

487

505

494

}

506

495

507

496

/* OpenPGP credentials */

508

ret = gnutls_certificate_allocate_credentials(&mc->cred);

497

ret = gnutls_certificate_allocate_credentials(&mc.cred);

509

498

if(ret != GNUTLS_E_SUCCESS){

510

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

511

safer_gnutls_strerror(ret));

499

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

512

500

gnutls_global_deinit();

513

501

return -1;

514

502

}

515

503

516

504

if(debug){

517

505

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

518

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

519

pubkeyfilename,

520

seckeyfilename);

506

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

507

seckeyfilename);

521

508

}

522

509

523

510

ret = gnutls_certificate_set_openpgp_key_file

524

(mc->cred, pubkeyfilename, seckeyfilename,

511

(mc.cred, pubkeyfilename, seckeyfilename,

525

512

GNUTLS_OPENPGP_FMT_BASE64);

526

513

if(ret != GNUTLS_E_SUCCESS){

527

514

fprintf_plus(stderr,

528

515

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

529

516

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

530

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

531

safer_gnutls_strerror(ret));

517

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

532

518

goto globalfail;

533

519

}

534

520

535

521

/* GnuTLS server initialization */

536

ret = gnutls_dh_params_init(&mc->dh_params);

522

ret = gnutls_dh_params_init(&mc.dh_params);

537

523

if(ret != GNUTLS_E_SUCCESS){

538

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

539

" initialization: %s\n",

540

safer_gnutls_strerror(ret));

524

fprintf_plus(stderr, "Error in GnuTLS DH parameter initialization:"

525

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

541

526

goto globalfail;

542

527

}

543

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

528

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

544

529

if(ret != GNUTLS_E_SUCCESS){

545

530

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

546

safer_gnutls_strerror(ret));

531

safer_gnutls_strerror(ret));

547

532

goto globalfail;

548

533

}

549

534

550

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

535

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

551

536

552

537

return 0;

553

538

554

539

globalfail:

555

540

556

gnutls_certificate_free_credentials(mc->cred);

541

gnutls_certificate_free_credentials(mc.cred);

557

542

gnutls_global_deinit();

558

gnutls_dh_params_deinit(mc->dh_params);

543

gnutls_dh_params_deinit(mc.dh_params);

559

544

return -1;

560

545

}

561

546

562

static int init_gnutls_session(gnutls_session_t *session,

563

mandos_context *mc){

547

static int init_gnutls_session(gnutls_session_t *session){

564

548

int ret;

565

549

/* GnuTLS session creation */

566

550

do {

570

554

}

571

555

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

572

556

if(ret != GNUTLS_E_SUCCESS){

573

fprintf_plus(stderr,

574

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

575

safer_gnutls_strerror(ret));

557

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

558

safer_gnutls_strerror(ret));

576

559

}

577

560

578

561

{

579

562

const char *err;

580

563

do {

581

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

564

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

582

565

if(quit_now){

583

566

gnutls_deinit(*session);

584

567

return -1;

586

569

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

587

570

if(ret != GNUTLS_E_SUCCESS){

588

571

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

589

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

590

safer_gnutls_strerror(ret));

572

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

591

573

gnutls_deinit(*session);

592

574

return -1;

593

575

}

595

577

596

578

do {

597

579

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

598

mc->cred);

580

mc.cred);

599

581

if(quit_now){

600

582

gnutls_deinit(*session);

601

583

return -1;

603

585

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

604

586

if(ret != GNUTLS_E_SUCCESS){

605

587

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

606

safer_gnutls_strerror(ret));

588

safer_gnutls_strerror(ret));

607

589

gnutls_deinit(*session);

608

590

return -1;

609

591

}

611

593

/* ignore client certificate if any. */

612

594

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

613

595

614

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

596

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

615

597

616

598

return 0;

617

599

}

621

603

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

622

604

623

605

/* Called when a Mandos server is found */

624

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

606

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

625

607

AvahiIfIndex if_index,

626

int af, mandos_context *mc){

608

int af){

627

609

int ret, tcp_sd = -1;

628

610

ssize_t sret;

629

611

union {

659

641

return -1;

660

642

}

661

643

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);

644

ret = init_gnutls_session(&session);

695

645

if(ret != 0){

696

646

return -1;

697

647

}

698

648

699

649

if(debug){

700

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

701

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

650

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

651

"\n", ip, port);

702

652

}

703

653

704

654

tcp_sd = socket(pf, SOCK_STREAM, 0);

735

685

goto mandos_end;

736

686

}

737

687

if(af == AF_INET6){

738

to.in6.sin6_port = htons(port);

688

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

689

-Wconversion and

690

-Wunreachable-code */

691

739

692

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

740

693

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

741

694

-Wunreachable-code*/

742

695

if(if_index == AVAHI_IF_UNSPEC){

743

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

744

" incomplete without a network interface\n");

696

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

697

" without a network interface\n");

745

698

errno = EINVAL;

746

699

goto mandos_end;

747

700

}

765

718

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

766

719

perror_plus("if_indextoname");

767

720

} else {

768

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

769

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

721

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

722

ip, interface, port);

770

723

}

771

724

} else {

772

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

773

ip, (uintmax_t)port);

725

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

774

726

}

775

727

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

776

728

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

854

806

goto mandos_end;

855

807

}

856

808

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);

809

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

810

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

862

811

863

812

if(quit_now){

864

813

errno = EINTR;

885

834

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

886

835

887

836

if(debug){

888

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

889

" %s\n", ip);

837

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

890

838

}

891

839

892

840

while(true){

930

878

}

931

879

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

932

880

if(ret < 0){

933

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

934

"***\n");

881

fprintf_plus(stderr, "*** GnuTLS Re-handshake failed ***\n");

935

882

gnutls_perror(ret);

936

883

errno = EPROTO;

937

884

goto mandos_end;

939

886

break;

940

887

default:

941

888

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

942

" encrypted session with Mandos server\n");

889

" encrypted session with Mandos server\n");

943

890

gnutls_bye(session, GNUTLS_SHUT_RDWR);

944

891

errno = EIO;

945

892

goto mandos_end;

969

916

if(buffer_length > 0){

970

917

ssize_t decrypted_buffer_size;

971

918

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

972

&decrypted_buffer, mc);

919

&decrypted_buffer);

973

920

if(decrypted_buffer_size >= 0){

974

921

975

922

written = 0;

986

933

int e = errno;

987

934

if(debug){

988

935

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

989

strerror(errno));

936

strerror(errno));

990

937

}

991

938

errno = e;

992

939

goto mandos_end;

1036

983

AVAHI_GCC_UNUSED AvahiStringList *txt,

1037

984

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1038

985

flags,

1039

void* mc){

1040

if(r == NULL){

1041

return;

1042

}

986

AVAHI_GCC_UNUSED void* userdata){

987

assert(r);

1043

988

1044

989

/* Called whenever a service has been resolved successfully or

1045

990

timed out */

1051

996

switch(event){

1052

997

default:

1053

998

case AVAHI_RESOLVER_FAILURE:

1054

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

1055

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

1056

domain,

1057

avahi_strerror(avahi_server_errno

1058

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

999

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

1000

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

1001

avahi_strerror(avahi_server_errno(mc.server)));

1059

1002

break;

1060

1003

1061

1004

case AVAHI_RESOLVER_FOUND:

1064

1007

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

1065

1008

if(debug){

1066

1009

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

1067

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

1068

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

1010

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

1011

ip, (intmax_t)interface, port);

1069

1012

}

1070

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

1071

interface,

1072

avahi_proto_to_af(proto),

1073

mc);

1013

int ret = start_mandos_communication(ip, port, interface,

1014

avahi_proto_to_af(proto));

1074

1015

if(ret == 0){

1075

avahi_simple_poll_quit(simple_poll);

1016

avahi_simple_poll_quit(mc.simple_poll);

1076

1017

} else {

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

}

1018

ret = add_server(ip, port, interface,

1019

avahi_proto_to_af(proto));

1083

1020

}

1084

1021

}

1085

1022

}

1095

1032

const char *domain,

1096

1033

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1097

1034

flags,

1098

void* mc){

1099

if(b == NULL){

1100

return;

1101

}

1035

AVAHI_GCC_UNUSED void* userdata){

1036

assert(b);

1102

1037

1103

1038

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

1104

1039

is removed from the LAN */

1112

1047

case AVAHI_BROWSER_FAILURE:

1113

1048

1114

1049

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

1115

avahi_strerror(avahi_server_errno

1116

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

1117

avahi_simple_poll_quit(simple_poll);

1050

avahi_strerror(avahi_server_errno(mc.server)));

1051

avahi_simple_poll_quit(mc.simple_poll);

1118

1052

return;

1119

1053

1120

1054

case AVAHI_BROWSER_NEW:

1123

1057

the callback function is called the Avahi server will free the

1124

1058

resolver for us. */

1125

1059

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)

1130

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

1131

" %s\n", name,

1132

avahi_strerror(avahi_server_errno

1133

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

1060

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

1061

name, type, domain, protocol, 0,

1062

resolve_callback, NULL) == NULL)

1063

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

1064

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

1134

1065

break;

1135

1066

1136

1067

case AVAHI_BROWSER_REMOVE:

1139

1070

case AVAHI_BROWSER_ALL_FOR_NOW:

1140

1071

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1141

1072

if(debug){

1142

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

1143

" searching...\n");

1073

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

1144

1074

}

1145

1075

break;

1146

1076

}

1155

1085

signal_received = sig;

1156

1086

int old_errno = errno;

1157

1087

/* set main loop to exit */

1158

if(simple_poll != NULL){

1159

avahi_simple_poll_quit(simple_poll);

1088

if(mc.simple_poll != NULL){

1089

avahi_simple_poll_quit(mc.simple_poll);

1160

1090

}

1161

1091

errno = old_errno;

1162

1092

}

1163

1093

1164

1094

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

1165

1095

int ret;

1166

error_t ret_errno;

1167

1096

1168

1097

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

1169

1098

if(s < 0){

1170

ret_errno = errno;

1171

1099

perror_plus("socket");

1172

errno = ret_errno;

1173

1100

return false;

1174

1101

}

1175

1102

strcpy(ifr->ifr_name, ifname);

1176

1103

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1177

1104

if(ret == -1){

1178

1105

if(debug){

1179

ret_errno = errno;

1180

1106

perror_plus("ioctl SIOCGIFFLAGS");

1181

errno = ret_errno;

1182

1107

}

1183

1108

return false;

1184

1109

}

1190

1115

/* Reject the loopback device */

1191

1116

if(ifr->ifr_flags & IFF_LOOPBACK){

1192

1117

if(debug){

1193

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

1194

ifname);

1118

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

1195

1119

}

1196

1120

return false;

1197

1121

}

1198

1122

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

1199

1123

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

1200

1124

if(debug){

1201

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

1202

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

1125

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

1203

1126

}

1204

1127

return true;

1205

1128

}

1206

1129

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

1207

1130

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

1208

1131

if(debug){

1209

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1210

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

1132

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

1211

1133

}

1212

1134

return false;

1213

1135

}

1214

1136

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

1215

1137

if(ifr->ifr_flags & IFF_NOARP){

1216

1138

if(debug){

1217

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

1218

ifname);

1139

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

1219

1140

}

1220

1141

return false;

1221

1142

}

1240

1161

struct ifreq ifr;

1241

1162

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

1242

1163

if(debug){

1243

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

1244

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

1245

}

1246

return 0;

1247

}

1248

1249

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

1250

return 0;

1251

}

1252

return 1;

1253

}

1254

1255

/*

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);

1164

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

1165

if_entry->d_name);

1166

}

1167

return 0;

1168

}

1169

1170

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

1171

return 0;

1172

}

1173

return 1;

1174

}

1175

1176

/*

1177

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

1178

* corresponds to an acceptable network device which is up.

1179

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

1180

*/

1181

int up_interface(const struct dirent *if_entry){

1182

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

1183

return 0;

1184

}

1185

1186

struct ifreq ifr;

1187

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

1188

if(debug){

1189

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

1190

if_entry->d_name);

1191

}

1192

return 0;

1193

}

1194

1195

/* Reject down interfaces */

1196

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

1197

if(debug){

1198

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

1199

if_entry->d_name);

1200

}

1201

return 0;

1202

}

1203

1204

/* Reject non-running interfaces */

1205

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

1206

if(debug){

1207

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

1208

if_entry->d_name);

1209

}

1210

return 0;

1211

}

1212

1213

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

1214

return 0;

1215

}

1216

return 1;

1285

1217

}

1286

1218

1287

1219

int notdotentries(const struct dirent *direntry){

1314

1246

/* Contains non-allowed characters */

1315

1247

if(debug){

1316

1248

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

1317

direntry->d_name);

1249

direntry->d_name);

1318

1250

}

1319

1251

return 0;

1320

1252

}

1337

1269

/* Not a regular file */

1338

1270

if(debug){

1339

1271

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

1340

direntry->d_name);

1272

direntry->d_name);

1341

1273

}

1342

1274

return 0;

1343

1275

}

1345

1277

/* Not executable */

1346

1278

if(debug){

1347

1279

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

1348

direntry->d_name);

1280

direntry->d_name);

1349

1281

}

1350

1282

return 0;

1351

1283

}

1352

if(debug){

1353

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

1354

direntry->d_name);

1355

}

1356

1284

return 1;

1357

1285

}

1358

1286

1359

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1360

mandos_context *mc){

1287

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1361

1288

int ret;

1362

1289

struct timespec now;

1363

1290

struct timespec waited_time;

1364

1291

intmax_t block_time;

1365

1292

1366

1293

while(true){

1367

if(mc->current_server == NULL){

1294

if(mc.current_server == NULL){

1368

1295

if (debug){

1369

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

1370

" No timeout!\n");

1296

fprintf_plus(stderr, "Wait until first server is found. No timeout!\n");

1371

1297

}

1372

1298

ret = avahi_simple_poll_iterate(s, -1);

1373

1299

} else {

1374

1300

if (debug){

1375

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

1376

" it, or wait\n");

1301

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

1302

" or wait\n");

1377

1303

}

1378

1304

/* the current time */

1379

1305

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1384

1310

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

1385

1311

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

1386

1312

waited_time.tv_sec = (now.tv_sec

1387

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

1313

- mc.current_server->last_seen.tv_sec);

1388

1314

waited_time.tv_nsec = (now.tv_nsec

1389

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

1315

- mc.current_server->last_seen.tv_nsec);

1390

1316

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

1391

1317

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

1392

1318

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

1395

1321

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

1396

1322

1397

1323

if (debug){

1398

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

1399

block_time);

1324

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

1400

1325

}

1401

1326

1402

1327

if(block_time <= 0){

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);

1328

ret = start_mandos_communication(mc.current_server->ip,

1329

mc.current_server->port,

1330

mc.current_server->if_index,

1331

mc.current_server->af);

1407

1332

if(ret == 0){

1408

avahi_simple_poll_quit(s);

1333

avahi_simple_poll_quit(mc.simple_poll);

1409

1334

return 0;

1410

1335

}

1411

1336

ret = clock_gettime(CLOCK_MONOTONIC,

1412

&mc->current_server->last_seen);

1337

&mc.current_server->last_seen);

1413

1338

if(ret == -1){

1414

1339

perror_plus("clock_gettime");

1415

1340

return -1;

1416

1341

}

1417

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

1342

mc.current_server = mc.current_server->next;

1418

1343

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

1419

1344

servers, but don't block */

1420

1345

}

1429

1354

}

1430

1355

}

1431

1356

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

1484

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

1485

const float delay){

1486

struct dirent **direntries;

1487

struct dirent *direntry;

1488

int ret;

1489

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

1490

alphasort);

1491

if(numhooks == -1){

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

}

1500

} else {

1501

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

1502

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

1503

direntry = direntries[i];

1504

char *fullname = NULL;

1505

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

1506

if(ret < 0){

1507

perror_plus("asprintf");

1508

continue;

1509

}

1510

if(debug){

1511

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

1512

direntry->d_name);

1513

}

1514

pid_t hook_pid = fork();

1515

if(hook_pid == 0){

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

}

1531

dup2(devnull, STDIN_FILENO);

1532

close(devnull);

1533

dup2(STDERR_FILENO, STDOUT_FILENO);

1534

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

1535

if(ret == -1){

1536

perror_plus("setenv");

1537

_exit(EX_OSERR);

1538

}

1539

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

1540

if(ret == -1){

1541

perror_plus("setenv");

1542

_exit(EX_OSERR);

1543

}

1544

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

1545

if(ret == -1){

1546

perror_plus("setenv");

1547

_exit(EX_OSERR);

1548

}

1549

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

1550

if(ret == -1){

1551

perror_plus("setenv");

1552

_exit(EX_OSERR);

1553

}

1554

char *delaystring;

1555

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

1556

if(ret == -1){

1557

perror_plus("asprintf");

1558

_exit(EX_OSERR);

1559

}

1560

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

1561

if(ret == -1){

1562

free(delaystring);

1563

perror_plus("setenv");

1564

_exit(EX_OSERR);

1565

}

1566

free(delaystring);

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

}

1578

} else {

1579

int status;

1580

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

1581

perror_plus("waitpid");

1582

free(fullname);

1583

continue;

1584

}

1585

if(WIFEXITED(status)){

1586

if(WEXITSTATUS(status) != 0){

1587

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

1588

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

1589

WEXITSTATUS(status));

1590

free(fullname);

1591

continue;

1592

}

1593

} else if(WIFSIGNALED(status)){

1594

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

1595

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

1596

WTERMSIG(status));

1597

free(fullname);

1598

continue;

1599

} else {

1600

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

1601

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

1602

free(fullname);

1603

continue;

1604

}

1605

}

1606

free(fullname);

1607

if(debug){

1608

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

1609

direntry->d_name);

1610

}

1611

}

1612

close(devnull);

1613

}

1614

return true;

1615

}

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

1789

1357

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 };

1794

1358

AvahiSServiceBrowser *sb = NULL;

1795

error_t ret_errno;

1359

int error;

1796

1360

int ret;

1797

1361

intmax_t tmpmax;

1798

1362

char *tmp;

1799

1363

int exitcode = EXIT_SUCCESS;

1800

char *interfaces_to_take_down = NULL;

1801

size_t interfaces_to_take_down_size = 0;

1364

const char *interface = "";

1365

struct ifreq network;

1366

int sd = -1;

1367

bool take_down_interface = false;

1368

uid_t uid;

1369

gid_t gid;

1802

1370

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

1803

1371

bool tempdir_created = false;

1804

1372

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1805

1373

const char *seckey = PATHDIR "/" SECKEY;

1806

1374

const char *pubkey = PATHDIR "/" PUBKEY;

1807

char *interfaces_hooks = NULL;

1808

size_t interfaces_hooks_size = 0;

1809

1375

1810

1376

bool gnutls_initialized = false;

1811

1377

bool gpgme_initialized = false;

1873

1439

.group = 2 },

1874

1440

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

1875

1441

.arg = "SECONDS",

1876

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

1442

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

1877

1443

.group = 2 },

1878

1444

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

1879

1445

.arg = "DIR",

1902

1468

connect_to = arg;

1903

1469

break;

1904

1470

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

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

}

1471

interface = arg;

1910

1472

break;

1911

1473

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

1912

1474

seckey = arg;

1955

1517

argp_state_help(state, state->out_stream,

1956

1518

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1957

1519

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

1520

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

1958

1521

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

1959

1522

exit(argp_err_exit_status);

1960

1523

break;

1988

1551

{

1989

1552

/* Work around Debian bug #633582:

1990

1553

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

1554

struct stat st;

1991

1555

1992

1556

/* Re-raise priviliges */

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

}

2057

}

2058

}

2059

2060

/* Run network hooks */

2061

{

2062

if(mc.interfaces != NULL){

2063

interfaces_hooks = malloc(mc.interfaces_size);

2064

if(interfaces_hooks == NULL){

2065

perror_plus("malloc");

2066

goto end;

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)',');

2072

}

2073

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

2074

interfaces_hooks : "", delay)){

2075

goto end;

1557

errno = 0;

1558

ret = seteuid(0);

1559

if(ret == -1){

1560

perror_plus("seteuid");

1561

}

1562

1563

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

1564

int seckey_fd = open(seckey, O_RDONLY);

1565

if(seckey_fd == -1){

1566

perror_plus("open");

1567

} else {

1568

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

1569

if(ret == -1){

1570

perror_plus("fstat");

1571

} else {

1572

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

1573

ret = fchown(seckey_fd, uid, gid);

1574

if(ret == -1){

1575

perror_plus("fchown");

1576

}

1577

}

1578

}

1579

TEMP_FAILURE_RETRY(close(seckey_fd));

1580

}

1581

}

1582

1583

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

1584

int pubkey_fd = open(pubkey, O_RDONLY);

1585

if(pubkey_fd == -1){

1586

perror_plus("open");

1587

} else {

1588

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

1589

if(ret == -1){

1590

perror_plus("fstat");

1591

} else {

1592

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

1593

ret = fchown(pubkey_fd, uid, gid);

1594

if(ret == -1){

1595

perror_plus("fchown");

1596

}

1597

}

1598

}

1599

TEMP_FAILURE_RETRY(close(pubkey_fd));

1600

}

1601

}

1602

1603

/* Lower privileges */

1604

errno = 0;

1605

ret = seteuid(uid);

1606

if(ret == -1){

1607

perror_plus("seteuid");

1608

}

1609

}

1610

1611

/* Find network hooks and run them */

1612

{

1613

struct dirent **direntries;

1614

struct dirent *direntry;

1615

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

1616

alphasort);

1617

if(numhooks == -1){

1618

perror_plus("scandir");

1619

} else {

1620

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

1621

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

1622

direntry = direntries[0];

1623

char *fullname = NULL;

1624

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

1625

if(ret < 0){

1626

perror_plus("asprintf");

1627

continue;

1628

}

1629

pid_t hook_pid = fork();

1630

if(hook_pid == 0){

1631

/* Child */

1632

dup2(devnull, STDIN_FILENO);

1633

close(devnull);

1634

dup2(STDERR_FILENO, STDOUT_FILENO);

1635

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

1636

if(ret == -1){

1637

perror_plus("setenv");

1638

exit(1);

1639

}

1640

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

1641

if(ret == -1){

1642

perror_plus("setenv");

1643

exit(1);

1644

}

1645

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

1646

if(ret == -1){

1647

perror_plus("setenv");

1648

exit(1);

1649

}

1650

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

1651

if(ret == -1){

1652

perror_plus("setenv");

1653

exit(1);

1654

}

1655

char *delaystring;

1656

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

1657

if(ret == -1){

1658

perror_plus("asprintf");

1659

exit(1);

1660

}

1661

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

1662

if(ret == -1){

1663

free(delaystring);

1664

perror_plus("setenv");

1665

exit(1);

1666

}

1667

free(delaystring);

1668

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

1669

perror_plus("execl");

1670

} else {

1671

int status;

1672

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

1673

perror_plus("waitpid");

1674

free(fullname);

1675

continue;

1676

}

1677

if(WIFEXITED(status)){

1678

if(WEXITSTATUS(status) != 0){

1679

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

1680

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

1681

WEXITSTATUS(status));

1682

free(fullname);

1683

continue;

1684

}

1685

} else if(WIFSIGNALED(status)){

1686

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

1687

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

1688

WTERMSIG(status));

1689

free(fullname);

1690

continue;

1691

} else {

1692

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

1693

direntry->d_name);

1694

free(fullname);

1695

continue;

1696

}

1697

}

1698

free(fullname);

1699

if(quit_now){

1700

goto end;

1701

}

1702

}

1703

close(devnull);

2076

1704

}

2077

1705

}

2078

1706

2080

1708

avahi_set_log_function(empty_log);

2081

1709

}

2082

1710

1711

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

1712

struct dirent **direntries;

1713

/* First look for interfaces that are up */

1714

ret = scandir(sys_class_net, &direntries, up_interface,

1715

alphasort);

1716

if(ret == 0){

1717

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

1718

free(direntries);

1719

ret = scandir(sys_class_net, &direntries, good_interface,

1720

alphasort);

1721

}

1722

if(ret >= 1){

1723

/* Pick the first interface returned */

1724

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

1725

if(debug){

1726

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

1727

}

1728

if(interface == NULL){

1729

perror_plus("malloc");

1730

free(direntries);

1731

exitcode = EXIT_FAILURE;

1732

goto end;

1733

}

1734

free(direntries);

1735

} else {

1736

free(direntries);

1737

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

1738

exitcode = EXIT_FAILURE;

1739

goto end;

1740

}

1741

}

1742

2083

1743

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

2084

1744

from the signal handler */

2085

1745

/* Initialize the pseudo-RNG for Avahi */

2086

1746

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

2087

simple_poll = avahi_simple_poll_new();

2088

if(simple_poll == NULL){

2089

fprintf_plus(stderr,

2090

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

1747

mc.simple_poll = avahi_simple_poll_new();

1748

if(mc.simple_poll == NULL){

1749

fprintf_plus(stderr, "Avahi: Failed to create simple poll object.\n");

2091

1750

exitcode = EX_UNAVAILABLE;

2092

1751

goto end;

2093

1752

}

2155

1814

}

2156

1815

}

2157

1816

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;

1817

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

1818

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

1819

if_index = (AvahiIfIndex) if_nametoindex(interface);

1820

if(if_index == 0){

1821

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

1822

exitcode = EX_UNAVAILABLE;

1823

goto end;

1824

}

1825

1826

if(quit_now){

1827

goto end;

1828

}

1829

1830

/* Re-raise priviliges */

1831

errno = 0;

1832

ret = seteuid(0);

1833

if(ret == -1){

1834

perror_plus("seteuid");

1835

}

1836

1837

#ifdef __linux__

1838

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1839

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

1840

ret = klogctl(8, NULL, 5);

1841

bool restore_loglevel = true;

1842

if(ret == -1){

1843

restore_loglevel = false;

1844

perror_plus("klogctl");

1845

}

1846

#endif /* __linux__ */

1847

1848

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1849

if(sd < 0){

1850

perror_plus("socket");

1851

exitcode = EX_OSERR;

1852

#ifdef __linux__

1853

if(restore_loglevel){

1854

ret = klogctl(7, NULL, 0);

1855

if(ret == -1){

1856

perror_plus("klogctl");

1857

}

1858

}

1859

#endif /* __linux__ */

1860

/* Lower privileges */

1861

errno = 0;

1862

ret = seteuid(uid);

1863

if(ret == -1){

1864

perror_plus("seteuid");

1865

}

1866

goto end;

1867

}

1868

strcpy(network.ifr_name, interface);

1869

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

1870

if(ret == -1){

1871

perror_plus("ioctl SIOCGIFFLAGS");

1872

#ifdef __linux__

1873

if(restore_loglevel){

1874

ret = klogctl(7, NULL, 0);

1875

if(ret == -1){

1876

perror_plus("klogctl");

1877

}

1878

}

1879

#endif /* __linux__ */

1880

exitcode = EX_OSERR;

1881

/* Lower privileges */

1882

errno = 0;

1883

ret = seteuid(uid);

1884

if(ret == -1){

1885

perror_plus("seteuid");

1886

}

1887

goto end;

1888

}

1889

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

1890

network.ifr_flags |= IFF_UP;

1891

take_down_interface = true;

1892

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

1893

if(ret == -1){

1894

take_down_interface = false;

1895

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1896

exitcode = EX_OSERR;

1897

#ifdef __linux__

1898

if(restore_loglevel){

1899

ret = klogctl(7, NULL, 0);

1900

if(ret == -1){

1901

perror_plus("klogctl");

2204

1902

}

2205

1903

}

1904

#endif /* __linux__ */

1905

/* Lower privileges */

1906

errno = 0;

1907

ret = seteuid(uid);

1908

if(ret == -1){

1909

perror_plus("seteuid");

1910

}

1911

goto end;

1912

}

1913

}

1914

/* Sleep checking until interface is running.

1915

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

1916

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

1917

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

1918

if(ret == -1){

1919

perror_plus("ioctl SIOCGIFFLAGS");

1920

} else if(network.ifr_flags & IFF_RUNNING){

2206

1921

break;

2207

1922

}

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);

1923

struct timespec sleeptime = { .tv_nsec = 250000000 };

1924

ret = nanosleep(&sleeptime, NULL);

1925

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

1926

perror_plus("nanosleep");

1927

}

1928

}

1929

if(not take_down_interface){

1930

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

1931

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

1932

if(ret == -1){

1933

perror_plus("close");

1934

}

1935

}

1936

#ifdef __linux__

1937

if(restore_loglevel){

1938

/* Restores kernel loglevel to default */

1939

ret = klogctl(7, NULL, 0);

1940

if(ret == -1){

1941

perror_plus("klogctl");

1942

}

1943

}

1944

#endif /* __linux__ */

1945

/* Lower privileges */

1946

errno = 0;

1947

if(take_down_interface){

1948

/* Lower privileges */

1949

ret = seteuid(uid);

1950

if(ret == -1){

1951

perror_plus("seteuid");

1952

}

1953

} else {

1954

/* Lower privileges permanently */

1955

ret = setuid(uid);

1956

if(ret == -1){

1957

perror_plus("setuid");

1958

}

1959

}

2233

1960

}

2234

1961

2235

1962

if(quit_now){

2236

1963

goto end;

2237

1964

}

2238

1965

2239

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

1966

ret = init_gnutls_global(pubkey, seckey);

2240

1967

if(ret == -1){

2241

1968

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

2242

1969

exitcode = EX_UNAVAILABLE;

2259

1986

goto end;

2260

1987

}

2261

1988

2262

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

1989

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

2263

1990

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

2264

1991

exitcode = EX_UNAVAILABLE;

2265

1992

goto end;

2275

2002

/* Connect directly, do not use Zeroconf */

2276

2003

/* (Mainly meant for debugging) */

2277

2004

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

2278

2279

2005

if(address == NULL){

2280

2006

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

2281

2007

exitcode = EX_USAGE;

2286

2012

goto end;

2287

2013

}

2288

2014

2289

in_port_t port;

2015

uint16_t port;

2290

2016

errno = 0;

2291

2017

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

2292

2018

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

2293

or tmpmax != (in_port_t)tmpmax){

2019

or tmpmax != (uint16_t)tmpmax){

2294

2020

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

2295

2021

exitcode = EX_USAGE;

2296

2022

goto end;

2297

2023

}

2298

2024

2299

2025

if(quit_now){

2300

2026

goto end;

2301

2027

}

2302

2028

2303

port = (in_port_t)tmpmax;

2029

port = (uint16_t)tmpmax;

2304

2030

*address = '\0';

2305

2031

/* Colon in address indicates IPv6 */

2306

2032

int af;

2322

2048

}

2323

2049

2324

2050

while(not quit_now){

2325

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

2326

&mc);

2051

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

2327

2052

if(quit_now or ret == 0){

2328

2053

break;

2329

2054

}

2330

2055

if(debug){

2331

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

2332

(int)retry_interval);

2056

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

2333

2057

}

2334

2058

sleep((int)retry_interval);

2335

2059

}

2355

2079

config.publish_domain = 0;

2356

2080

2357

2081

/* Allocate a new server */

2358

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2359

&config, NULL, NULL, &ret_errno);

2082

mc.server = avahi_server_new(avahi_simple_poll_get

2083

(mc.simple_poll), &config, NULL,

2084

NULL, &error);

2360

2085

2361

2086

/* Free the Avahi configuration data */

2362

2087

avahi_server_config_free(&config);

2365

2090

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

2366

2091

if(mc.server == NULL){

2367

2092

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

2368

avahi_strerror(ret_errno));

2093

avahi_strerror(error));

2369

2094

exitcode = EX_UNAVAILABLE;

2370

2095

goto end;

2371

2096

}

2377

2102

/* Create the Avahi service browser */

2378

2103

sb = avahi_s_service_browser_new(mc.server, if_index,

2379

2104

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2380

NULL, 0, browse_callback,

2381

(void *)&mc);

2105

NULL, 0, browse_callback, NULL);

2382

2106

if(sb == NULL){

2383

2107

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

2384

avahi_strerror(avahi_server_errno(mc.server)));

2108

avahi_strerror(avahi_server_errno(mc.server)));

2385

2109

exitcode = EX_UNAVAILABLE;

2386

2110

goto end;

2387

2111

}

2396

2120

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

2397

2121

}

2398

2122

2399

ret = avahi_loop_with_timeout(simple_poll,

2400

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

2123

ret = avahi_loop_with_timeout(mc.simple_poll,

2124

(int)(retry_interval * 1000));

2401

2125

if(debug){

2402

2126

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

2403

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

2127

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

2404

2128

}

2405

2129

2406

2130

end:

2410

2134

}

2411

2135

2412

2136

/* Cleanup things */

2413

free(mc.interfaces);

2414

2415

2137

if(sb != NULL)

2416

2138

avahi_s_service_browser_free(sb);

2417

2139

2418

2140

if(mc.server != NULL)

2419

2141

avahi_server_free(mc.server);

2420

2142

2421

if(simple_poll != NULL)

2422

avahi_simple_poll_free(simple_poll);

2143

if(mc.simple_poll != NULL)

2144

avahi_simple_poll_free(mc.simple_poll);

2423

2145

2424

2146

if(gnutls_initialized){

2425

2147

gnutls_certificate_free_credentials(mc.cred);

2430

2152

if(gpgme_initialized){

2431

2153

gpgme_release(mc.ctx);

2432

2154

}

2433

2155

2434

2156

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

2435

2157

has seen */

2436

2158

if(mc.current_server != NULL){

2442

2164

}

2443

2165

}

2444

2166

2445

/* Re-raise priviliges */

2446

{

2447

raise_privileges();

2448

2449

/* Run network hooks */

2450

run_network_hooks("stop", interfaces_hooks != NULL ?

2451

interfaces_hooks : "", delay);

2452

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");

2167

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

2168

2169

/* Take down the network interface */

2170

if(take_down_interface){

2171

/* Re-raise priviliges */

2172

errno = 0;

2173

ret = seteuid(0);

2174

if(ret == -1){

2175

perror_plus("seteuid");

2176

}

2177

if(geteuid() == 0){

2178

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

2179

if(ret == -1){

2180

perror_plus("ioctl SIOCGIFFLAGS");

2181

} else if(network.ifr_flags & IFF_UP){

2182

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

2183

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

2184

if(ret == -1){

2185

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2463

2186

}

2464

2187

}

2465

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

2466

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

2467

" down\n");

2188

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

2189

if(ret == -1){

2190

perror_plus("close");

2191

}

2192

/* Lower privileges permanently */

2193

errno = 0;

2194

ret = setuid(uid);

2195

if(ret == -1){

2196

perror_plus("setuid");

2468

2197

}

2469

2198

}

2470

2471

lower_privileges_permanently();

2472

2199

}

2473

2200

2474

free(interfaces_to_take_down);

2475

free(interfaces_hooks);

2476

2477

2201

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

2478

2202

if(tempdir_created){

2479

2203

struct dirent **direntries = NULL;

2492

2216

}

2493

2217

ret = remove(fullname);

2494

2218

if(ret == -1){

2495

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

2496

strerror(errno));

2219

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

2497

2220

}

2498

2221

free(fullname);

2499

2222

}