/mandos/trunk : revision 690

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

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*

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* Everything else is

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*

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

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

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

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stdout, ferror(), remove() */

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

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

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

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

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strtof(), abort() */

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opendir(), DIR */

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#include <sys/stat.h> /* open(), S_ISREG */

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#include <sys/socket.h> /* socket(), struct sockaddr_in6,

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inet_pton(), connect() */

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inet_pton(), connect(),

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getnameinfo() */

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#include <fcntl.h> /* open() */

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#include <dirent.h> /* opendir(), struct dirent, readdir()

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*/

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

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strtoimax() */

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

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

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program_invocation_short_name */

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

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*/

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

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

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setgid(), pause() */

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

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

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

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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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argp_state, struct argp,

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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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#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,

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EAI_SYSTEM, gai_strerror() */

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#ifdef __linux__

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

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

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char *connect_to = NULL;

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const char *hookdir = HOOKDIR;

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uid_t uid = 65534;

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gid_t gid = 65534;

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

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typedef struct server{

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const char *ip;

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uint16_t port;

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in_port_t port;

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AvahiIfIndex if_index;

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int af;

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struct timespec last_seen;

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

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typedef struct {

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AvahiSimplePoll *simple_poll;

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AvahiServer *server;

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gnutls_certificate_credentials_t cred;

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162

unsigned int dh_bits;

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164

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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185

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

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187

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

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va_list ap;

179

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

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* "buffer_length" is how much is already used.

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*/

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__attribute__((nonnull, warn_unused_result))

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size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

193

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if(buffer_length + BUFFER_SIZE > buffer_capacity){

194

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

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if(buffer == NULL){

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

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if(new_buf == NULL){

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int old_errno = errno;

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free(*buffer);

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errno = old_errno;

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*buffer = NULL;

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return 0;

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}

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*buffer = new_buf;

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buffer_capacity += BUFFER_SIZE;

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215

}

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return buffer_capacity;

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}

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

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

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int af){

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__attribute__((nonnull, warn_unused_result))

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

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int af, server **current_server){

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int ret;

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

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if(new_server == NULL){

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perror_plus("malloc");

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return -1;

227

return false;

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}

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

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.port = port,

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.af = af };

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if(new_server->ip == NULL){

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perror_plus("strdup");

218

return -1;

235

return false;

236

}

237

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

238

if(ret == -1){

239

perror_plus("clock_gettime");

240

return false;

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241

}

220

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/* Special case of first server */

221

if (mc.current_server == NULL){

243

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

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*current_server = new_server;

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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;

248

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

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new_server->next = *current_server;

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

229

251

new_server->prev->next = new_server;

230

mc.current_server->prev = new_server;

231

}

232

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

233

if(ret == -1){

234

perror_plus("clock_gettime");

235

return -1;

236

}

237

return 0;

252

(*current_server)->prev = new_server;

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}

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return true;

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255

}

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240

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/*

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* Initialize GPGME.

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*/

243

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

244

const char *tempdir){

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__attribute__((nonnull, warn_unused_result))

261

static bool init_gpgme(const char * const seckey,

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const char * const pubkey,

263

const char * const tempdir,

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mandos_context *mc){

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265

gpgme_error_t rc;

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266

gpgme_engine_info_t engine_info;

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267

248

249

268

/*

250

269

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

251

270

*/

252

bool import_key(const char *filename){

271

bool import_key(const char * const filename){

253

272

int ret;

254

273

int fd;

255

274

gpgme_data_t pgp_data;

267

286

return false;

268

287

}

269

288

270

rc = gpgme_op_import(mc.ctx, pgp_data);

289

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

271

290

if(rc != GPG_ERR_NO_ERROR){

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291

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

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gpgme_strsource(rc), gpgme_strerror(rc));

317

336

}

318

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/* Create new GPGME "context" */

320

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

339

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

321

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if(rc != GPG_ERR_NO_ERROR){

322

341

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

323

342

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

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355

* Decrypt OpenPGP data.

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356

* Returns -1 on error

338

357

*/

358

__attribute__((nonnull, warn_unused_result))

339

359

static ssize_t pgp_packet_decrypt(const char *cryptotext,

340

360

size_t crypto_size,

341

char **plaintext){

361

char **plaintext,

362

mandos_context *mc){

342

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gpgme_data_t dh_crypto, dh_plain;

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gpgme_error_t rc;

344

365

ssize_t ret;

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

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data buffer */

373

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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plaintext_length = -1;

378

399

if(debug){

379

400

gpgme_decrypt_result_t result;

380

result = gpgme_op_decrypt_result(mc.ctx);

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result = gpgme_op_decrypt_result(mc->ctx);

381

402

if(result == NULL){

382

403

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

383

404

} else {

460

481

return plaintext_length;

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482

}

462

483

463

static const char * safer_gnutls_strerror(int value){

464

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

465

-Wunreachable-code */

484

__attribute__((warn_unused_result))

485

static const char *safer_gnutls_strerror(int value){

486

const char *ret = gnutls_strerror(value);

466

487

if(ret == NULL)

467

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ret = "(unknown)";

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return ret;

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490

}

470

491

471

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/* GnuTLS log function callback */

493

__attribute__((nonnull))

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494

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

473

495

const char* string){

474

496

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

475

497

}

476

498

499

__attribute__((nonnull, warn_unused_result))

477

500

static int init_gnutls_global(const char *pubkeyfilename,

478

const char *seckeyfilename){

501

const char *seckeyfilename,

502

mandos_context *mc){

479

503

int ret;

480

504

481

505

if(debug){

498

522

}

499

523

500

524

/* OpenPGP credentials */

501

ret = gnutls_certificate_allocate_credentials(&mc.cred);

525

ret = gnutls_certificate_allocate_credentials(&mc->cred);

502

526

if(ret != GNUTLS_E_SUCCESS){

503

527

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

504

528

safer_gnutls_strerror(ret));

514

538

}

515

539

516

540

ret = gnutls_certificate_set_openpgp_key_file

517

(mc.cred, pubkeyfilename, seckeyfilename,

541

(mc->cred, pubkeyfilename, seckeyfilename,

518

542

GNUTLS_OPENPGP_FMT_BASE64);

519

543

if(ret != GNUTLS_E_SUCCESS){

520

544

fprintf_plus(stderr,

526

550

}

527

551

528

552

/* GnuTLS server initialization */

529

ret = gnutls_dh_params_init(&mc.dh_params);

553

ret = gnutls_dh_params_init(&mc->dh_params);

530

554

if(ret != GNUTLS_E_SUCCESS){

531

555

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

532

556

" initialization: %s\n",

533

557

safer_gnutls_strerror(ret));

534

558

goto globalfail;

535

559

}

536

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

560

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

537

561

if(ret != GNUTLS_E_SUCCESS){

538

562

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

539

563

safer_gnutls_strerror(ret));

540

564

goto globalfail;

541

565

}

542

566

543

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

567

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

544

568

545

569

return 0;

546

570

547

571

globalfail:

548

572

549

gnutls_certificate_free_credentials(mc.cred);

573

gnutls_certificate_free_credentials(mc->cred);

550

574

gnutls_global_deinit();

551

gnutls_dh_params_deinit(mc.dh_params);

575

gnutls_dh_params_deinit(mc->dh_params);

552

576

return -1;

553

577

}

554

578

555

static int init_gnutls_session(gnutls_session_t *session){

579

__attribute__((nonnull, warn_unused_result))

580

static int init_gnutls_session(gnutls_session_t *session,

581

mandos_context *mc){

556

582

int ret;

557

583

/* GnuTLS session creation */

558

584

do {

570

596

{

571

597

const char *err;

572

598

do {

573

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

599

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

574

600

if(quit_now){

575

601

gnutls_deinit(*session);

576

602

return -1;

587

613

588

614

do {

589

615

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

590

mc.cred);

616

mc->cred);

591

617

if(quit_now){

592

618

gnutls_deinit(*session);

593

619

return -1;

603

629

/* ignore client certificate if any. */

604

630

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

605

631

606

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

632

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

607

633

608

634

return 0;

609

635

}

613

639

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

614

640

615

641

/* Called when a Mandos server is found */

616

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

642

__attribute__((nonnull, warn_unused_result))

643

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

617

644

AvahiIfIndex if_index,

618

int af){

645

int af, mandos_context *mc){

619

646

int ret, tcp_sd = -1;

620

647

ssize_t sret;

621

union {

622

struct sockaddr_in in;

623

struct sockaddr_in6 in6;

624

} to;

648

struct sockaddr_storage to;

625

649

char *buffer = NULL;

626

650

char *decrypted_buffer = NULL;

627

651

size_t buffer_length = 0;

651

675

return -1;

652

676

}

653

677

654

ret = init_gnutls_session(&session);

678

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

679

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

680

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

681

bool match = false;

682

{

683

char *interface = NULL;

684

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

685

interface))){

686

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

687

match = true;

688

break;

689

}

690

}

691

}

692

if(not match){

693

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

694

connect to the server */

695

if(debug){

696

char interface[IF_NAMESIZE];

697

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

698

perror_plus("if_indextoname");

699

} else {

700

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

701

" \"%s\"\n",

702

if_indextoname((unsigned int)if_index,

703

interface));

704

}

705

}

706

return -1;

707

}

708

}

709

710

ret = init_gnutls_session(&session, mc);

655

711

if(ret != 0){

656

712

return -1;

657

713

}

658

714

659

715

if(debug){

660

716

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

661

PRIu16 "\n", ip, port);

717

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

662

718

}

663

719

664

720

tcp_sd = socket(pf, SOCK_STREAM, 0);

676

732

677

733

memset(&to, 0, sizeof(to));

678

734

if(af == AF_INET6){

679

to.in6.sin6_family = (sa_family_t)af;

680

ret = inet_pton(af, ip, &to.in6.sin6_addr);

735

((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;

736

ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);

681

737

} else { /* IPv4 */

682

to.in.sin_family = (sa_family_t)af;

683

ret = inet_pton(af, ip, &to.in.sin_addr);

738

((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;

739

ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);

684

740

}

685

741

if(ret < 0 ){

686

742

int e = errno;

695

751

goto mandos_end;

696

752

}

697

753

if(af == AF_INET6){

698

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

699

-Wconversion and

700

-Wunreachable-code */

701

702

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

703

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

704

-Wunreachable-code*/

754

((struct sockaddr_in6 *)&to)->sin6_port = htons(port);

755

if(IN6_IS_ADDR_LINKLOCAL

756

(&((struct sockaddr_in6 *)&to)->sin6_addr)){

705

757

if(if_index == AVAHI_IF_UNSPEC){

706

758

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

707

759

" incomplete without a network interface\n");

709

761

goto mandos_end;

710

762

}

711

763

/* Set the network interface number as scope */

712

to.in6.sin6_scope_id = (uint32_t)if_index;

764

((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;

713

765

}

714

766

} else {

715

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

716

-Wconversion and

717

-Wunreachable-code */

767

((struct sockaddr_in *)&to)->sin_port = htons(port);

718

768

}

719

769

720

770

if(quit_now){

728

778

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

729

779

perror_plus("if_indextoname");

730

780

} else {

731

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

732

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

781

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

782

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

733

783

}

734

784

} else {

735

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

736

ip, port);

785

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

786

ip, (uintmax_t)port);

737

787

}

738

788

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

739

789

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

740

const char *pcret;

741

790

if(af == AF_INET6){

742

pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,

743

sizeof(addrstr));

791

ret = getnameinfo((struct sockaddr *)&to,

792

sizeof(struct sockaddr_in6),

793

addrstr, sizeof(addrstr), NULL, 0,

794

NI_NUMERICHOST);

744

795

} else {

745

pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,

746

sizeof(addrstr));

796

ret = getnameinfo((struct sockaddr *)&to,

797

sizeof(struct sockaddr_in),

798

addrstr, sizeof(addrstr), NULL, 0,

799

NI_NUMERICHOST);

747

800

}

748

if(pcret == NULL){

749

perror_plus("inet_ntop");

750

} else {

751

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

752

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

753

}

801

if(ret == EAI_SYSTEM){

802

perror_plus("getnameinfo");

803

} else if(ret != 0) {

804

fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));

805

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

806

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

754

807

}

755

808

}

756

809

760

813

}

761

814

762

815

if(af == AF_INET6){

763

ret = connect(tcp_sd, &to.in6, sizeof(to));

816

ret = connect(tcp_sd, (struct sockaddr *)&to,

817

sizeof(struct sockaddr_in6));

764

818

} else {

765

ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */

819

ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */

820

sizeof(struct sockaddr_in));

766

821

}

767

822

if(ret < 0){

768

if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){

823

if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){

769

824

int e = errno;

770

825

perror_plus("connect");

771

826

errno = e;

817

872

goto mandos_end;

818

873

}

819

874

820

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

821

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

875

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

876

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

877

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

878

gnutls_transport_set_ptr(session,

879

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

822

880

823

881

if(quit_now){

824

882

errno = EINTR;

929

987

if(buffer_length > 0){

930

988

ssize_t decrypted_buffer_size;

931

989

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

932

&decrypted_buffer);

990

&decrypted_buffer, mc);

933

991

if(decrypted_buffer_size >= 0){

934

992

935

993

written = 0;

983

1041

return retval;

984

1042

}

985

1043

1044

__attribute__((nonnull))

986

1045

static void resolve_callback(AvahiSServiceResolver *r,

987

1046

AvahiIfIndex interface,

988

1047

AvahiProtocol proto,

996

1055

AVAHI_GCC_UNUSED AvahiStringList *txt,

997

1056

AVAHI_GCC_UNUSED AvahiLookupResultFlags

998

1057

flags,

999

AVAHI_GCC_UNUSED void* userdata){

1000

assert(r);

1058

void *mc){

1059

if(r == NULL){

1060

return;

1061

}

1001

1062

1002

1063

/* Called whenever a service has been resolved successfully or

1003

1064

timed out */

1012

1073

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

1013

1074

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

1014

1075

domain,

1015

avahi_strerror(avahi_server_errno(mc.server)));

1076

avahi_strerror(avahi_server_errno

1077

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

1016

1078

break;

1017

1079

1018

1080

case AVAHI_RESOLVER_FOUND:

1024

1086

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

1025

1087

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

1026

1088

}

1027

int ret = start_mandos_communication(ip, port, interface,

1028

avahi_proto_to_af(proto));

1089

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

1090

interface,

1091

avahi_proto_to_af(proto),

1092

mc);

1029

1093

if(ret == 0){

1030

avahi_simple_poll_quit(mc.simple_poll);

1094

avahi_simple_poll_quit(simple_poll);

1031

1095

} else {

1032

ret = add_server(ip, port, interface,

1033

avahi_proto_to_af(proto));

1096

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

1097

avahi_proto_to_af(proto),

1098

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

1099

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

1100

" list\n", name);

1101

}

1034

1102

}

1035

1103

}

1036

1104

}

1046

1114

const char *domain,

1047

1115

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1048

1116

flags,

1049

AVAHI_GCC_UNUSED void* userdata){

1050

assert(b);

1117

void *mc){

1118

if(b == NULL){

1119

return;

1120

}

1051

1121

1052

1122

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

1053

1123

is removed from the LAN */

1061

1131

case AVAHI_BROWSER_FAILURE:

1062

1132

1063

1133

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

1064

avahi_strerror(avahi_server_errno(mc.server)));

1065

avahi_simple_poll_quit(mc.simple_poll);

1134

avahi_strerror(avahi_server_errno

1135

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

1136

avahi_simple_poll_quit(simple_poll);

1066

1137

return;

1067

1138

1068

1139

case AVAHI_BROWSER_NEW:

1071

1142

the callback function is called the Avahi server will free the

1072

1143

resolver for us. */

1073

1144

1074

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

1075

name, type, domain, protocol, 0,

1076

resolve_callback, NULL) == NULL)

1145

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

1146

interface, protocol, name, type,

1147

domain, protocol, 0,

1148

resolve_callback, mc) == NULL)

1077

1149

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

1078

1150

" %s\n", name,

1079

avahi_strerror(avahi_server_errno(mc.server)));

1151

avahi_strerror(avahi_server_errno

1152

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

1080

1153

break;

1081

1154

1082

1155

case AVAHI_BROWSER_REMOVE:

1101

1174

signal_received = sig;

1102

1175

int old_errno = errno;

1103

1176

/* set main loop to exit */

1104

if(mc.simple_poll != NULL){

1105

avahi_simple_poll_quit(mc.simple_poll);

1177

if(simple_poll != NULL){

1178

avahi_simple_poll_quit(simple_poll);

1106

1179

}

1107

1180

errno = old_errno;

1108

1181

}

1109

1182

1183

__attribute__((nonnull, warn_unused_result))

1110

1184

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

1111

1185

int ret;

1186

error_t ret_errno;

1112

1187

1113

1188

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

1114

1189

if(s < 0){

1190

ret_errno = errno;

1115

1191

perror_plus("socket");

1192

errno = ret_errno;

1116

1193

return false;

1117

1194

}

1118

1195

strcpy(ifr->ifr_name, ifname);

1119

1196

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1120

1197

if(ret == -1){

1121

1198

if(debug){

1199

ret_errno = errno;

1122

1200

perror_plus("ioctl SIOCGIFFLAGS");

1201

errno = ret_errno;

1123

1202

}

1124

1203

return false;

1125

1204

}

1126

1205

return true;

1127

1206

}

1128

1207

1208

__attribute__((nonnull, warn_unused_result))

1129

1209

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

1130

1210

1131

1211

/* Reject the loopback device */

1173

1253

* corresponds to an acceptable network device.

1174

1254

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

1175

1255

*/

1256

__attribute__((nonnull, warn_unused_result))

1176

1257

int good_interface(const struct dirent *if_entry){

1177

1258

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

1178

1259

return 0;

1194

1275

}

1195

1276

1196

1277

/*

1197

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

1198

* corresponds to an acceptable network device which is up.

1199

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

1200

*/

1201

int up_interface(const struct dirent *if_entry){

1202

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

1203

return 0;

1204

}

1205

1206

struct ifreq ifr;

1207

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

1208

if(debug){

1209

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

1210

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

1211

}

1212

return 0;

1213

}

1214

1215

/* Reject down interfaces */

1216

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

1217

if(debug){

1218

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

1219

if_entry->d_name);

1220

}

1221

return 0;

1222

}

1223

1224

/* Reject non-running interfaces */

1225

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

1226

if(debug){

1227

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

1228

if_entry->d_name);

1229

}

1230

return 0;

1231

}

1232

1233

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

1234

return 0;

1235

}

1236

return 1;

1237

}

1238

1278

* This function determines if a network interface is up.

1279

*/

1280

__attribute__((nonnull, warn_unused_result))

1281

bool interface_is_up(const char *interface){

1282

struct ifreq ifr;

1283

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

1284

if(debug){

1285

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

1286

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

1287

}

1288

return false;

1289

}

1290

1291

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

1292

}

1293

1294

/*

1295

* This function determines if a network interface is running

1296

*/

1297

__attribute__((nonnull, warn_unused_result))

1298

bool interface_is_running(const char *interface){

1299

struct ifreq ifr;

1300

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

1301

if(debug){

1302

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

1303

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

1304

}

1305

return false;

1306

}

1307

1308

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

1309

}

1310

1311

__attribute__((nonnull, pure, warn_unused_result))

1239

1312

int notdotentries(const struct dirent *direntry){

1240

1313

/* Skip "." and ".." */

1241

1314

if(direntry->d_name[0] == '.'

1248

1321

}

1249

1322

1250

1323

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

1324

__attribute__((nonnull, warn_unused_result))

1251

1325

int runnable_hook(const struct dirent *direntry){

1252

1326

int ret;

1253

1327

size_t sret;

1261

1335

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

1262

1336

"abcdefghijklmnopqrstuvwxyz"

1263

1337

"0123456789"

1264

"_-");

1338

"_.-");

1265

1339

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

1266

1340

/* Contains non-allowed characters */

1267

1341

if(debug){

1285

1359

}

1286

1360

return 0;

1287

1361

}

1362

free(fullname);

1288

1363

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

1289

1364

/* Not a regular file */

1290

1365

if(debug){

1301

1376

}

1302

1377

return 0;

1303

1378

}

1379

if(debug){

1380

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

1381

direntry->d_name);

1382

}

1304

1383

return 1;

1305

1384

}

1306

1385

1307

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1386

__attribute__((nonnull, warn_unused_result))

1387

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1388

mandos_context *mc){

1308

1389

int ret;

1309

1390

struct timespec now;

1310

1391

struct timespec waited_time;

1311

1392

intmax_t block_time;

1312

1393

1313

1394

while(true){

1314

if(mc.current_server == NULL){

1315

if (debug){

1395

if(mc->current_server == NULL){

1396

if(debug){

1316

1397

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

1317

1398

" No timeout!\n");

1318

1399

}

1319

1400

ret = avahi_simple_poll_iterate(s, -1);

1320

1401

} else {

1321

if (debug){

1402

if(debug){

1322

1403

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

1323

1404

" it, or wait\n");

1324

1405

}

1331

1412

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

1332

1413

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

1333

1414

waited_time.tv_sec = (now.tv_sec

1334

- mc.current_server->last_seen.tv_sec);

1415

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

1335

1416

waited_time.tv_nsec = (now.tv_nsec

1336

- mc.current_server->last_seen.tv_nsec);

1417

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

1337

1418

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

1338

1419

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

1339

1420

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

1341

1422

- ((intmax_t)waited_time.tv_sec * 1000))

1342

1423

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

1343

1424

1344

if (debug){

1425

if(debug){

1345

1426

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

1346

1427

block_time);

1347

1428

}

1348

1429

1349

1430

if(block_time <= 0){

1350

ret = start_mandos_communication(mc.current_server->ip,

1351

mc.current_server->port,

1352

mc.current_server->if_index,

1353

mc.current_server->af);

1431

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

1432

mc->current_server->port,

1433

mc->current_server->if_index,

1434

mc->current_server->af, mc);

1354

1435

if(ret == 0){

1355

avahi_simple_poll_quit(mc.simple_poll);

1436

avahi_simple_poll_quit(s);

1356

1437

return 0;

1357

1438

}

1358

1439

ret = clock_gettime(CLOCK_MONOTONIC,

1359

&mc.current_server->last_seen);

1440

&mc->current_server->last_seen);

1360

1441

if(ret == -1){

1361

1442

perror_plus("clock_gettime");

1362

1443

return -1;

1363

1444

}

1364

mc.current_server = mc.current_server->next;

1445

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

1365

1446

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

1366

1447

servers, but don't block */

1367

1448

}

1369

1450

ret = avahi_simple_poll_iterate(s, (int)block_time);

1370

1451

}

1371

1452

if(ret != 0){

1372

if (ret > 0 or errno != EINTR){

1453

if(ret > 0 or errno != EINTR){

1373

1454

return (ret != 1) ? ret : 0;

1374

1455

}

1375

1456

}

1376

1457

}

1377

1458

}

1378

1459

1379

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

1460

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

1461

__attribute__((warn_unused_result))

1462

error_t raise_privileges(void){

1463

error_t old_errno = errno;

1464

error_t ret_errno = 0;

1465

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

1466

ret_errno = errno;

1467

perror_plus("seteuid");

1468

}

1469

errno = old_errno;

1470

return ret_errno;

1471

}

1472

1473

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

1474

__attribute__((warn_unused_result))

1475

error_t raise_privileges_permanently(void){

1476

error_t old_errno = errno;

1477

error_t ret_errno = raise_privileges();

1478

if(ret_errno != 0){

1479

errno = old_errno;

1480

return ret_errno;

1481

}

1482

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

1483

ret_errno = errno;

1484

perror_plus("seteuid");

1485

}

1486

errno = old_errno;

1487

return ret_errno;

1488

}

1489

1490

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

1491

__attribute__((warn_unused_result))

1492

error_t lower_privileges(void){

1493

error_t old_errno = errno;

1494

error_t ret_errno = 0;

1495

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

1496

ret_errno = errno;

1497

perror_plus("seteuid");

1498

}

1499

errno = old_errno;

1500

return ret_errno;

1501

}

1502

1503

/* Lower privileges permanently */

1504

__attribute__((warn_unused_result))

1505

error_t lower_privileges_permanently(void){

1506

error_t old_errno = errno;

1507

error_t ret_errno = 0;

1508

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

1509

ret_errno = errno;

1510

perror_plus("setuid");

1511

}

1512

errno = old_errno;

1513

return ret_errno;

1514

}

1515

1516

__attribute__((nonnull))

1517

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

1380

1518

const float delay){

1381

1519

struct dirent **direntries;

1382

struct dirent *direntry;

1383

int ret;

1384

1520

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

1385

1521

alphasort);

1386

1522

if(numhooks == -1){

1387

perror_plus("scandir");

1523

if(errno == ENOENT){

1524

if(debug){

1525

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

1526

" found\n", hookdir);

1527

}

1528

} else {

1529

perror_plus("scandir");

1530

}

1388

1531

} else {

1532

struct dirent *direntry;

1533

int ret;

1389

1534

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

1390

1535

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

1391

direntry = direntries[0];

1536

direntry = direntries[i];

1392

1537

char *fullname = NULL;

1393

1538

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

1394

1539

if(ret < 0){

1395

1540

perror_plus("asprintf");

1396

1541

continue;

1397

1542

}

1543

if(debug){

1544

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

1545

direntry->d_name);

1546

}

1398

1547

pid_t hook_pid = fork();

1399

1548

if(hook_pid == 0){

1400

1549

/* Child */

1401

dup2(devnull, STDIN_FILENO);

1402

close(devnull);

1403

dup2(STDERR_FILENO, STDOUT_FILENO);

1550

/* Raise privileges */

1551

if(raise_privileges_permanently() != 0){

1552

perror_plus("Failed to raise privileges");

1553

_exit(EX_NOPERM);

1554

}

1555

/* Set group */

1556

errno = 0;

1557

ret = setgid(0);

1558

if(ret == -1){

1559

perror_plus("setgid");

1560

_exit(EX_NOPERM);

1561

}

1562

/* Reset supplementary groups */

1563

errno = 0;

1564

ret = setgroups(0, NULL);

1565

if(ret == -1){

1566

perror_plus("setgroups");

1567

_exit(EX_NOPERM);

1568

}

1569

ret = dup2(devnull, STDIN_FILENO);

1570

if(ret == -1){

1571

perror_plus("dup2(devnull, STDIN_FILENO)");

1572

_exit(EX_OSERR);

1573

}

1574

ret = close(devnull);

1575

if(ret == -1){

1576

perror_plus("close");

1577

_exit(EX_OSERR);

1578

}

1579

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1580

if(ret == -1){

1581

perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");

1582

_exit(EX_OSERR);

1583

}

1404

1584

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

1405

1585

if(ret == -1){

1406

1586

perror_plus("setenv");

1407

return false;

1587

_exit(EX_OSERR);

1408

1588

}

1409

1589

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

1410

1590

if(ret == -1){

1411

1591

perror_plus("setenv");

1412

return false;

1592

_exit(EX_OSERR);

1413

1593

}

1414

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

1594

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

1415

1595

if(ret == -1){

1416

1596

perror_plus("setenv");

1417

return false;

1597

_exit(EX_OSERR);

1418

1598

}

1419

1599

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

1420

1600

if(ret == -1){

1421

1601

perror_plus("setenv");

1422

return false;

1602

_exit(EX_OSERR);

1423

1603

}

1424

1604

char *delaystring;

1425

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

1605

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

1426

1606

if(ret == -1){

1427

1607

perror_plus("asprintf");

1428

return false;

1608

_exit(EX_OSERR);

1429

1609

}

1430

1610

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

1431

1611

if(ret == -1){

1432

1612

free(delaystring);

1433

1613

perror_plus("setenv");

1434

return false;

1614

_exit(EX_OSERR);

1435

1615

}

1436

1616

free(delaystring);

1437

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

1438

perror_plus("execl");

1617

if(connect_to != NULL){

1618

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

1619

if(ret == -1){

1620

perror_plus("setenv");

1621

_exit(EX_OSERR);

1622

}

1623

}

1624

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

1625

perror_plus("execl");

1626

_exit(EXIT_FAILURE);

1627

}

1439

1628

} else {

1440

1629

int status;

1441

1630

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

1465

1654

}

1466

1655

}

1467

1656

free(fullname);

1468

if(quit_now){

1469

break;

1657

if(debug){

1658

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

1659

direntry->d_name);

1470

1660

}

1471

1661

}

1472

1662

close(devnull);

1473

1663

}

1474

return true;

1664

}

1665

1666

__attribute__((nonnull, warn_unused_result))

1667

error_t bring_up_interface(const char *const interface,

1668

const float delay){

1669

error_t old_errno = errno;

1670

int ret;

1671

struct ifreq network;

1672

unsigned int if_index = if_nametoindex(interface);

1673

if(if_index == 0){

1674

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

1675

errno = old_errno;

1676

return ENXIO;

1677

}

1678

1679

if(quit_now){

1680

errno = old_errno;

1681

return EINTR;

1682

}

1683

1684

if(not interface_is_up(interface)){

1685

error_t ret_errno = 0, ioctl_errno = 0;

1686

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

1687

ret_errno = errno;

1688

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

1689

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

1690

errno = old_errno;

1691

return ret_errno;

1692

}

1693

network.ifr_flags |= IFF_UP; /* set flag */

1694

1695

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

1696

if(sd == -1){

1697

ret_errno = errno;

1698

perror_plus("socket");

1699

errno = old_errno;

1700

return ret_errno;

1701

}

1702

1703

if(quit_now){

1704

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

1705

if(ret == -1){

1706

perror_plus("close");

1707

}

1708

errno = old_errno;

1709

return EINTR;

1710

}

1711

1712

if(debug){

1713

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

1714

interface);

1715

}

1716

1717

/* Raise privileges */

1718

ret_errno = raise_privileges();

1719

if(ret_errno != 0){

1720

perror_plus("Failed to raise privileges");

1721

}

1722

1723

#ifdef __linux__

1724

int ret_linux;

1725

bool restore_loglevel = false;

1726

if(ret_errno == 0){

1727

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1728

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

1729

ret_linux = klogctl(8, NULL, 5);

1730

if(ret_linux == -1){

1731

perror_plus("klogctl");

1732

} else {

1733

restore_loglevel = true;

1734

}

1735

}

1736

#endif /* __linux__ */

1737

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

1738

ioctl_errno = errno;

1739

#ifdef __linux__

1740

if(restore_loglevel){

1741

ret_linux = klogctl(7, NULL, 0);

1742

if(ret_linux == -1){

1743

perror_plus("klogctl");

1744

}

1745

}

1746

#endif /* __linux__ */

1747

1748

/* If raise_privileges() succeeded above */

1749

if(ret_errno == 0){

1750

/* Lower privileges */

1751

ret_errno = lower_privileges();

1752

if(ret_errno != 0){

1753

errno = ret_errno;

1754

perror_plus("Failed to lower privileges");

1755

}

1756

}

1757

1758

/* Close the socket */

1759

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

1760

if(ret == -1){

1761

perror_plus("close");

1762

}

1763

1764

if(ret_setflags == -1){

1765

errno = ioctl_errno;

1766

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1767

errno = old_errno;

1768

return ioctl_errno;

1769

}

1770

} else if(debug){

1771

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

1772

interface);

1773

}

1774

1775

/* Sleep checking until interface is running.

1776

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

1777

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

1778

if(interface_is_running(interface)){

1779

break;

1780

}

1781

struct timespec sleeptime = { .tv_nsec = 250000000 };

1782

ret = nanosleep(&sleeptime, NULL);

1783

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

1784

perror_plus("nanosleep");

1785

}

1786

}

1787

1788

errno = old_errno;

1789

return 0;

1790

}

1791

1792

__attribute__((nonnull, warn_unused_result))

1793

error_t take_down_interface(const char *const interface){

1794

error_t old_errno = errno;

1795

struct ifreq network;

1796

unsigned int if_index = if_nametoindex(interface);

1797

if(if_index == 0){

1798

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

1799

errno = old_errno;

1800

return ENXIO;

1801

}

1802

if(interface_is_up(interface)){

1803

error_t ret_errno = 0, ioctl_errno = 0;

1804

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

1805

ret_errno = errno;

1806

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

1807

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

1808

errno = old_errno;

1809

return ret_errno;

1810

}

1811

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

1812

1813

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

1814

if(sd == -1){

1815

ret_errno = errno;

1816

perror_plus("socket");

1817

errno = old_errno;

1818

return ret_errno;

1819

}

1820

1821

if(debug){

1822

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

1823

interface);

1824

}

1825

1826

/* Raise privileges */

1827

ret_errno = raise_privileges();

1828

if(ret_errno != 0){

1829

perror_plus("Failed to raise privileges");

1830

}

1831

1832

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

1833

ioctl_errno = errno;

1834

1835

/* If raise_privileges() succeeded above */

1836

if(ret_errno == 0){

1837

/* Lower privileges */

1838

ret_errno = lower_privileges();

1839

if(ret_errno != 0){

1840

errno = ret_errno;

1841

perror_plus("Failed to lower privileges");

1842

}

1843

}

1844

1845

/* Close the socket */

1846

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

1847

if(ret == -1){

1848

perror_plus("close");

1849

}

1850

1851

if(ret_setflags == -1){

1852

errno = ioctl_errno;

1853

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1854

errno = old_errno;

1855

return ioctl_errno;

1856

}

1857

} else if(debug){

1858

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

1859

interface);

1860

}

1861

1862

errno = old_errno;

1863

return 0;

1475

1864

}

1476

1865

1477

1866

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

1867

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

1868

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

1869

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

1870

.interfaces = NULL, .interfaces_size = 0 };

1478

1871

AvahiSServiceBrowser *sb = NULL;

1479

int error;

1872

error_t ret_errno;

1480

1873

int ret;

1481

1874

intmax_t tmpmax;

1482

1875

char *tmp;

1483

1876

int exitcode = EXIT_SUCCESS;

1484

const char *interface = "";

1485

struct ifreq network;

1486

int sd = -1;

1487

bool take_down_interface = false;

1488

uid_t uid;

1489

gid_t gid;

1490

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

1491

bool tempdir_created = false;

1877

char *interfaces_to_take_down = NULL;

1878

size_t interfaces_to_take_down_size = 0;

1879

char run_tempdir[] = "/run/tmp/mandosXXXXXX";

1880

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

1881

char *tempdir = NULL;

1492

1882

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1493

1883

const char *seckey = PATHDIR "/" SECKEY;

1494

1884

const char *pubkey = PATHDIR "/" PUBKEY;

1885

char *interfaces_hooks = NULL;

1495

1886

1496

1887

bool gnutls_initialized = false;

1497

1888

bool gpgme_initialized = false;

1559

1950

.group = 2 },

1560

1951

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

1561

1952

.arg = "SECONDS",

1562

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

1953

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

1563

1954

.group = 2 },

1564

1955

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

1565

1956

.arg = "DIR",

1588

1979

connect_to = arg;

1589

1980

break;

1590

1981

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

1591

interface = arg;

1982

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

1983

arg, (int)',');

1984

if(ret_errno != 0){

1985

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

1986

}

1592

1987

break;

1593

1988

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

1594

1989

seckey = arg;

1637

2032

argp_state_help(state, state->out_stream,

1638

2033

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1639

2034

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

1640

fprintf_plus(state->out_stream,

1641

"Mandos plugin mandos-client: ");

1642

2035

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

1643

2036

exit(argp_err_exit_status);

1644

2037

break;

1672

2065

{

1673

2066

/* Work around Debian bug #633582:

1674

2067

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

1675

struct stat st;

1676

1677

/* Re-raise priviliges */

1678

errno = 0;

1679

ret = seteuid(0);

1680

if(ret == -1){

1681

perror_plus("seteuid");

1682

}

1683

1684

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

1685

int seckey_fd = open(seckey, O_RDONLY);

1686

if(seckey_fd == -1){

1687

perror_plus("open");

1688

} else {

1689

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

1690

if(ret == -1){

1691

perror_plus("fstat");

1692

} else {

1693

if(S_ISREG(st.st_mode)

1694

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

1695

ret = fchown(seckey_fd, uid, gid);

1696

if(ret == -1){

1697

perror_plus("fchown");

1698

}

1699

}

1700

}

1701

TEMP_FAILURE_RETRY(close(seckey_fd));

1702

}

1703

}

1704

1705

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

1706

int pubkey_fd = open(pubkey, O_RDONLY);

1707

if(pubkey_fd == -1){

1708

perror_plus("open");

1709

} else {

1710

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

1711

if(ret == -1){

1712

perror_plus("fstat");

1713

} else {

1714

if(S_ISREG(st.st_mode)

1715

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

1716

ret = fchown(pubkey_fd, uid, gid);

1717

if(ret == -1){

1718

perror_plus("fchown");

1719

}

1720

}

1721

}

1722

TEMP_FAILURE_RETRY(close(pubkey_fd));

1723

}

1724

}

1725

1726

/* Lower privileges */

1727

errno = 0;

1728

ret = seteuid(uid);

1729

if(ret == -1){

1730

perror_plus("seteuid");

2068

2069

/* Re-raise privileges */

2070

ret_errno = raise_privileges();

2071

if(ret_errno != 0){

2072

errno = ret_errno;

2073

perror_plus("Failed to raise privileges");

2074

} else {

2075

struct stat st;

2076

2077

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

2078

int seckey_fd = open(seckey, O_RDONLY);

2079

if(seckey_fd == -1){

2080

perror_plus("open");

2081

} else {

2082

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

2083

if(ret == -1){

2084

perror_plus("fstat");

2085

} else {

2086

if(S_ISREG(st.st_mode)

2087

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

2088

ret = fchown(seckey_fd, uid, gid);

2089

if(ret == -1){

2090

perror_plus("fchown");

2091

}

2092

}

2093

}

2094

TEMP_FAILURE_RETRY(close(seckey_fd));

2095

}

2096

}

2097

2098

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

2099

int pubkey_fd = open(pubkey, O_RDONLY);

2100

if(pubkey_fd == -1){

2101

perror_plus("open");

2102

} else {

2103

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

2104

if(ret == -1){

2105

perror_plus("fstat");

2106

} else {

2107

if(S_ISREG(st.st_mode)

2108

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

2109

ret = fchown(pubkey_fd, uid, gid);

2110

if(ret == -1){

2111

perror_plus("fchown");

2112

}

2113

}

2114

}

2115

TEMP_FAILURE_RETRY(close(pubkey_fd));

2116

}

2117

}

2118

2119

/* Lower privileges */

2120

ret_errno = lower_privileges();

2121

if(ret_errno != 0){

2122

errno = ret_errno;

2123

perror_plus("Failed to lower privileges");

2124

}

2125

}

2126

}

2127

2128

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

2129

{

2130

char *interface = NULL;

2131

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

2132

interface))){

2133

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

2134

and if_nametoindex(interface) == 0){

2135

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

2136

fprintf_plus(stderr, "Not using nonexisting interface"

2137

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

2138

}

2139

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

2140

interface = NULL;

2141

}

1731

2142

}

1732

2143

}

1733

2144

1734

2145

/* Run network hooks */

1735

2146

{

1736

/* Re-raise priviliges */

1737

errno = 0;

1738

ret = seteuid(0);

1739

if(ret == -1){

1740

perror_plus("seteuid");

1741

}

1742

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

1743

goto end;

1744

}

1745

/* Lower privileges */

1746

errno = 0;

1747

ret = seteuid(uid);

1748

if(ret == -1){

1749

perror_plus("seteuid");

1750

}

2147

if(mc.interfaces != NULL){

2148

interfaces_hooks = malloc(mc.interfaces_size);

2149

if(interfaces_hooks == NULL){

2150

perror_plus("malloc");

2151

goto end;

2152

}

2153

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

2154

argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');

2155

}

2156

run_network_hooks("start", interfaces_hooks != NULL ?

2157

interfaces_hooks : "", delay);

1751

2158

}

1752

2159

1753

2160

if(not debug){

1754

2161

avahi_set_log_function(empty_log);

1755

2162

}

1756

2163

1757

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

1758

struct dirent **direntries;

1759

/* First look for interfaces that are up */

1760

ret = scandir(sys_class_net, &direntries, up_interface,

1761

alphasort);

1762

if(ret == 0){

1763

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

1764

free(direntries);

1765

ret = scandir(sys_class_net, &direntries, good_interface,

1766

alphasort);

1767

}

1768

if(ret >= 1){

1769

/* Pick the first interface returned */

1770

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

1771

if(debug){

1772

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

1773

}

1774

if(interface == NULL){

1775

perror_plus("malloc");

1776

free(direntries);

1777

exitcode = EXIT_FAILURE;

1778

goto end;

1779

}

1780

free(direntries);

1781

} else {

1782

free(direntries);

1783

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

1784

exitcode = EXIT_FAILURE;

1785

goto end;

1786

}

1787

}

1788

1789

2164

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

1790

2165

from the signal handler */

1791

2166

/* Initialize the pseudo-RNG for Avahi */

1792

2167

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

1793

mc.simple_poll = avahi_simple_poll_new();

1794

if(mc.simple_poll == NULL){

2168

simple_poll = avahi_simple_poll_new();

2169

if(simple_poll == NULL){

1795

2170

fprintf_plus(stderr,

1796

2171

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

1797

2172

exitcode = EX_UNAVAILABLE;

1861

2236

}

1862

2237

}

1863

2238

1864

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

1865

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

1866

if_index = (AvahiIfIndex) if_nametoindex(interface);

1867

if(if_index == 0){

1868

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

1869

exitcode = EX_UNAVAILABLE;

1870

goto end;

1871

}

1872

1873

if(quit_now){

1874

goto end;

1875

}

1876

1877

/* Re-raise priviliges */

1878

errno = 0;

1879

ret = seteuid(0);

1880

if(ret == -1){

1881

perror_plus("seteuid");

1882

}

1883

1884

#ifdef __linux__

1885

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1886

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

1887

ret = klogctl(8, NULL, 5);

1888

bool restore_loglevel = true;

1889

if(ret == -1){

1890

restore_loglevel = false;

1891

perror_plus("klogctl");

1892

}

1893

#endif /* __linux__ */

1894

1895

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1896

if(sd < 0){

1897

perror_plus("socket");

1898

exitcode = EX_OSERR;

1899

#ifdef __linux__

1900

if(restore_loglevel){

1901

ret = klogctl(7, NULL, 0);

1902

if(ret == -1){

1903

perror_plus("klogctl");

1904

}

1905

}

1906

#endif /* __linux__ */

1907

/* Lower privileges */

1908

errno = 0;

1909

ret = seteuid(uid);

1910

if(ret == -1){

1911

perror_plus("seteuid");

1912

}

1913

goto end;

1914

}

1915

strcpy(network.ifr_name, interface);

1916

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

1917

if(ret == -1){

1918

perror_plus("ioctl SIOCGIFFLAGS");

1919

#ifdef __linux__

1920

if(restore_loglevel){

1921

ret = klogctl(7, NULL, 0);

1922

if(ret == -1){

1923

perror_plus("klogctl");

1924

}

1925

}

1926

#endif /* __linux__ */

1927

exitcode = EX_OSERR;

1928

/* Lower privileges */

1929

errno = 0;

1930

ret = seteuid(uid);

1931

if(ret == -1){

1932

perror_plus("seteuid");

1933

}

1934

goto end;

1935

}

1936

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

1937

network.ifr_flags |= IFF_UP;

1938

take_down_interface = true;

1939

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

1940

if(ret == -1){

1941

take_down_interface = false;

1942

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1943

exitcode = EX_OSERR;

1944

#ifdef __linux__

1945

if(restore_loglevel){

1946

ret = klogctl(7, NULL, 0);

1947

if(ret == -1){

1948

perror_plus("klogctl");

2239

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

2240

if(mc.interfaces == NULL){

2241

struct dirent **direntries;

2242

/* Look for any good interfaces */

2243

ret = scandir(sys_class_net, &direntries, good_interface,

2244

alphasort);

2245

if(ret >= 1){

2246

/* Add all found interfaces to interfaces list */

2247

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

2248

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

2249

direntries[i]->d_name);

2250

if(ret_errno != 0){

2251

errno = ret_errno;

2252

perror_plus("argz_add");

2253

continue;

2254

}

2255

if(debug){

2256

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

2257

direntries[i]->d_name);

2258

}

2259

}

2260

free(direntries);

2261

} else {

2262

free(direntries);

2263

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

2264

exitcode = EXIT_FAILURE;

2265

goto end;

2266

}

2267

}

2268

2269

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

2270

{

2271

char *interface = NULL;

2272

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

2273

interface))){

2274

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

2275

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

2276

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

2277

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

2278

interface);

2279

interface = NULL;

2280

while((interface = argz_next(mc.interfaces,

2281

mc.interfaces_size, interface))){

2282

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

2283

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

2284

interface);

2285

interface = NULL;

1949

2286

}

1950

2287

}

1951

#endif /* __linux__ */

1952

/* Lower privileges */

1953

errno = 0;

1954

ret = seteuid(uid);

1955

if(ret == -1){

1956

perror_plus("seteuid");

1957

}

1958

goto end;

1959

}

1960

}

1961

/* Sleep checking until interface is running.

1962

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

1963

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

1964

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

1965

if(ret == -1){

1966

perror_plus("ioctl SIOCGIFFLAGS");

1967

} else if(network.ifr_flags & IFF_RUNNING){

1968

2288

break;

1969

2289

}

1970

struct timespec sleeptime = { .tv_nsec = 250000000 };

1971

ret = nanosleep(&sleeptime, NULL);

1972

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

1973

perror_plus("nanosleep");

1974

}

1975

}

1976

if(not take_down_interface){

1977

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

1978

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

1979

if(ret == -1){

1980

perror_plus("close");

1981

}

1982

}

1983

#ifdef __linux__

1984

if(restore_loglevel){

1985

/* Restores kernel loglevel to default */

1986

ret = klogctl(7, NULL, 0);

1987

if(ret == -1){

1988

perror_plus("klogctl");

1989

}

1990

}

1991

#endif /* __linux__ */

1992

/* Lower privileges */

1993

errno = 0;

1994

/* Lower privileges */

1995

ret = seteuid(uid);

1996

if(ret == -1){

1997

perror_plus("seteuid");

1998

}

2290

bool interface_was_up = interface_is_up(interface);

2291

errno = bring_up_interface(interface, delay);

2292

if(not interface_was_up){

2293

if(errno != 0){

2294

perror_plus("Failed to bring up interface");

2295

} else {

2296

errno = argz_add(&interfaces_to_take_down,

2297

&interfaces_to_take_down_size,

2298

interface);

2299

if(errno != 0){

2300

perror_plus("argz_add");

2301

}

2302

}

2303

}

2304

}

2305

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

2306

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

2307

}

2308

}

2309

2310

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

2311

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

2312

if(debug){

2313

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

2314

mc.interfaces);

2315

}

2316

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

1999

2317

}

2000

2318

2001

2319

if(quit_now){

2002

2320

goto end;

2003

2321

}

2004

2322

2005

ret = init_gnutls_global(pubkey, seckey);

2323

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

2006

2324

if(ret == -1){

2007

2325

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

2008

2326

exitcode = EX_UNAVAILABLE;

2015

2333

goto end;

2016

2334

}

2017

2335

2018

if(mkdtemp(tempdir) == NULL){

2336

/* Try /run/tmp before /tmp */

2337

tempdir = mkdtemp(run_tempdir);

2338

if(tempdir == NULL and errno == ENOENT){

2339

if(debug){

2340

fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",

2341

run_tempdir, old_tempdir);

2342

}

2343

tempdir = mkdtemp(old_tempdir);

2344

}

2345

if(tempdir == NULL){

2019

2346

perror_plus("mkdtemp");

2020

2347

goto end;

2021

2348

}

2022

tempdir_created = true;

2023

2349

2024

2350

if(quit_now){

2025

2351

goto end;

2026

2352

}

2027

2353

2028

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

2354

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

2029

2355

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

2030

2356

exitcode = EX_UNAVAILABLE;

2031

2357

goto end;

2041

2367

/* Connect directly, do not use Zeroconf */

2042

2368

/* (Mainly meant for debugging) */

2043

2369

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

2370

2044

2371

if(address == NULL){

2045

2372

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

2046

2373

exitcode = EX_USAGE;

2051

2378

goto end;

2052

2379

}

2053

2380

2054

uint16_t port;

2381

in_port_t port;

2055

2382

errno = 0;

2056

2383

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

2057

2384

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

2058

or tmpmax != (uint16_t)tmpmax){

2385

or tmpmax != (in_port_t)tmpmax){

2059

2386

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

2060

2387

exitcode = EX_USAGE;

2061

2388

goto end;

2062

2389

}

2063

2390

2064

2391

if(quit_now){

2065

2392

goto end;

2066

2393

}

2067

2394

2068

port = (uint16_t)tmpmax;

2395

port = (in_port_t)tmpmax;

2069

2396

*address = '\0';

2070

2397

/* Colon in address indicates IPv6 */

2071

2398

int af;

2087

2414

}

2088

2415

2089

2416

while(not quit_now){

2090

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

2417

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

2418

&mc);

2091

2419

if(quit_now or ret == 0){

2092

2420

break;

2093

2421

}

2095

2423

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

2096

2424

(int)retry_interval);

2097

2425

}

2098

sleep((int)retry_interval);

2426

sleep((unsigned int)retry_interval);

2099

2427

}

2100

2428

2101

if (not quit_now){

2429

if(not quit_now){

2102

2430

exitcode = EXIT_SUCCESS;

2103

2431

}

2104

2432

2119

2447

config.publish_domain = 0;

2120

2448

2121

2449

/* Allocate a new server */

2122

mc.server = avahi_server_new(avahi_simple_poll_get

2123

(mc.simple_poll), &config, NULL,

2124

NULL, &error);

2450

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2451

&config, NULL, NULL, &ret_errno);

2125

2452

2126

2453

/* Free the Avahi configuration data */

2127

2454

avahi_server_config_free(&config);

2130

2457

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

2131

2458

if(mc.server == NULL){

2132

2459

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

2133

avahi_strerror(error));

2460

avahi_strerror(ret_errno));

2134

2461

exitcode = EX_UNAVAILABLE;

2135

2462

goto end;

2136

2463

}

2142

2469

/* Create the Avahi service browser */

2143

2470

sb = avahi_s_service_browser_new(mc.server, if_index,

2144

2471

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2145

NULL, 0, browse_callback, NULL);

2472

NULL, 0, browse_callback,

2473

(void *)&mc);

2146

2474

if(sb == NULL){

2147

2475

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

2148

2476

avahi_strerror(avahi_server_errno(mc.server)));

2159

2487

if(debug){

2160

2488

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

2161

2489

}

2162

2163

ret = avahi_loop_with_timeout(mc.simple_poll,

2164

(int)(retry_interval * 1000));

2490

2491

ret = avahi_loop_with_timeout(simple_poll,

2492

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

2165

2493

if(debug){

2166

2494

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

2167

2495

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

2174

2502

}

2175

2503

2176

2504

/* Cleanup things */

2505

free(mc.interfaces);

2506

2177

2507

if(sb != NULL)

2178

2508

avahi_s_service_browser_free(sb);

2179

2509

2180

2510

if(mc.server != NULL)

2181

2511

avahi_server_free(mc.server);

2182

2512

2183

if(mc.simple_poll != NULL)

2184

avahi_simple_poll_free(mc.simple_poll);

2513

if(simple_poll != NULL)

2514

avahi_simple_poll_free(simple_poll);

2185

2515

2186

2516

if(gnutls_initialized){

2187

2517

gnutls_certificate_free_credentials(mc.cred);

2192

2522

if(gpgme_initialized){

2193

2523

gpgme_release(mc.ctx);

2194

2524

}

2195

2525

2196

2526

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

2197

2527

has seen */

2198

2528

if(mc.current_server != NULL){

2204

2534

}

2205

2535

}

2206

2536

2207

/* Re-raise priviliges */

2537

/* Re-raise privileges */

2208

2538

{

2209

errno = 0;

2210

ret = seteuid(0);

2211

if(ret == -1){

2212

perror_plus("seteuid");

2213

}

2214

/* Run network hooks */

2215

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

2216

goto end;

2539

ret_errno = raise_privileges();

2540

if(ret_errno != 0){

2541

perror_plus("Failed to raise privileges");

2542

} else {

2543

2544

/* Run network hooks */

2545

run_network_hooks("stop", interfaces_hooks != NULL ?

2546

interfaces_hooks : "", delay);

2547

2548

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

2549

{

2550

char *interface = NULL;

2551

while((interface=argz_next(interfaces_to_take_down,

2552

interfaces_to_take_down_size,

2553

interface))){

2554

ret_errno = take_down_interface(interface);

2555

if(ret_errno != 0){

2556

errno = ret_errno;

2557

perror_plus("Failed to take down interface");

2558

}

2559

}

2560

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

2561

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

2562

" down\n");

2563

}

2564

}

2217

2565

}

2218

2566

2219

/* Take down the network interface */

2220

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

2221

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

2222

if(ret == -1){

2223

perror_plus("ioctl SIOCGIFFLAGS");

2224

} else if(network.ifr_flags & IFF_UP){

2225

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

2226

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

2227

if(ret == -1){

2228

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2229

}

2230

}

2231

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

2232

if(ret == -1){

2233

perror_plus("close");

2234

}

2567

ret_errno = lower_privileges_permanently();

2568

if(ret_errno != 0){

2569

perror_plus("Failed to lower privileges permanently");

2235

2570

}

2236

2571

}

2237

/* Lower privileges permanently */

2238

errno = 0;

2239

ret = setuid(uid);

2240

if(ret == -1){

2241

perror_plus("setuid");

2242

}

2572

2573

free(interfaces_to_take_down);

2574

free(interfaces_hooks);

2243

2575

2244

2576

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

2245

if(tempdir_created){

2577

if(tempdir != NULL){

2246

2578

struct dirent **direntries = NULL;

2247

2579

struct dirent *direntry = NULL;

2248

2580

int numentries = scandir(tempdir, &direntries, notdotentries,

2249

2581

alphasort);

2250

if (numentries > 0){

2582

if(numentries > 0){

2251

2583

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

2252

2584

direntry = direntries[i];

2253

2585

char *fullname = NULL;

2265

2597

free(fullname);

2266

2598

}

2267

2599

}

2268

2600

2269

2601

/* need to clean even if 0 because man page doesn't specify */

2270

2602

free(direntries);

2271

if (numentries == -1){

2603

if(numentries == -1){

2272

2604

perror_plus("scandir");

2273

2605

}

2274

2606

ret = rmdir(tempdir);