/mandos/release : revision 237.23.1

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

10

*

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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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/* Needed by GPGME, specifically gpgme_data_seek() */

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#ifndef _LARGEFILE_SOURCE

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#define _LARGEFILE_SOURCE

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#endif

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#endif /* not _LARGEFILE_SOURCE */

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#ifndef _FILE_OFFSET_BITS

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#define _FILE_OFFSET_BITS 64

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#endif

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#endif /* not _FILE_OFFSET_BITS */

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#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */

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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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stdout, ferror() */

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

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inet_pton(), connect(),

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getnameinfo() */

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

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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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unlinkat() */

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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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raise() */

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#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,

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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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init_gnutls_session(),

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119

GNUTLS_* */

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#include <gnutls/openpgp.h>

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* GPGME */

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

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const char *argp_program_bug_address = "<mandos@recompile.se>";

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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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int hookdir_fd = -1;

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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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151

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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162

AvahiServer *server;

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gnutls_certificate_credentials_t cred;

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164

unsigned int dh_bits;

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166

const char *priority;

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gpgme_ctx_t ctx;

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168

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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177

int signal_received = 0;

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/* Function to use when printing errors */

168

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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), nonnull))

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

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va_list ap;

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va_start (ap, format);

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193

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

194

program_invocation_short_name));

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

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}

197

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/*

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* Make additional room in "buffer" for at least BUFFER_SIZE more

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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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202

*/

203

__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){

205

size_t buffer_capacity){

181

206

if(buffer_length + BUFFER_SIZE > buffer_capacity){

182

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

183

if(buffer == NULL){

207

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

208

if(new_buf == NULL){

209

int old_errno = errno;

210

free(*buffer);

211

errno = old_errno;

212

*buffer = NULL;

184

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return 0;

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214

}

215

*buffer = new_buf;

186

216

buffer_capacity += BUFFER_SIZE;

187

217

}

188

218

return buffer_capacity;

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219

}

190

220

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

192

int add_server(const char *ip, uint16_t port,

193

AvahiIfIndex if_index,

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int af){

222

__attribute__((nonnull, warn_unused_result))

223

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

224

int af, server **current_server){

195

225

int ret;

196

226

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

197

227

if(new_server == NULL){

198

228

perror_plus("malloc");

199

return -1;

229

return false;

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230

}

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231

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

202

.port = port,

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.if_index = if_index,

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.af = af };

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.port = port,

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.if_index = if_index,

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.af = af };

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if(new_server->ip == NULL){

206

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perror_plus("strdup");

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return -1;

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free(new_server);

238

return false;

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}

240

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

241

if(ret == -1){

242

perror_plus("clock_gettime");

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#ifdef __GNUC__

244

#pragma GCC diagnostic push

245

#pragma GCC diagnostic ignored "-Wcast-qual"

246

#endif

247

free((char *)(new_server->ip));

248

#ifdef __GNUC__

249

#pragma GCC diagnostic pop

250

#endif

251

free(new_server);

252

return false;

208

253

}

209

254

/* Special case of first server */

210

if (mc.current_server == NULL){

255

if(*current_server == NULL){

211

256

new_server->next = new_server;

212

257

new_server->prev = new_server;

213

mc.current_server = new_server;

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

258

*current_server = new_server;

215

259

} else {

216

new_server->next = mc.current_server;

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

260

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

261

new_server->next = *current_server;

262

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

218

263

new_server->prev->next = new_server;

219

mc.current_server->prev = new_server;

220

}

221

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

222

if(ret == -1){

223

perror_plus("clock_gettime");

224

return -1;

225

}

226

return 0;

264

(*current_server)->prev = new_server;

265

}

266

return true;

227

267

}

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229

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/*

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270

* Initialize GPGME.

231

271

*/

232

static bool init_gpgme(const char *seckey,

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const char *pubkey, const char *tempdir){

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__attribute__((nonnull, warn_unused_result))

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static bool init_gpgme(const char * const seckey,

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const char * const pubkey,

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const char * const tempdir,

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mandos_context *mc){

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gpgme_error_t rc;

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gpgme_engine_info_t engine_info;

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279

237

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/*

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

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282

*/

241

bool import_key(const char *filename){

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bool import_key(const char * const filename){

242

284

int ret;

243

285

int fd;

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286

gpgme_data_t pgp_data;

251

293

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

253

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

257

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}

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300

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rc = gpgme_op_import(mc.ctx, pgp_data);

301

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

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302

if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

303

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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305

return false;

264

306

}

265

307

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314

}

273

315

274

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if(debug){

275

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

317

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

276

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}

277

319

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/* Init GPGME */

279

321

gpgme_check_version(NULL);

280

322

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

281

323

if(rc != GPG_ERR_NO_ERROR){

282

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

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gpgme_strsource(rc), gpgme_strerror(rc));

324

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

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gpgme_strsource(rc), gpgme_strerror(rc));

284

326

return false;

285

327

}

286

328

287

329

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

288

330

rc = gpgme_get_engine_info(&engine_info);

289

331

if(rc != GPG_ERR_NO_ERROR){

290

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

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gpgme_strsource(rc), gpgme_strerror(rc));

332

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

333

gpgme_strsource(rc), gpgme_strerror(rc));

292

334

return false;

293

335

}

294

336

while(engine_info != NULL){

300

342

engine_info = engine_info->next;

301

343

}

302

344

if(engine_info == NULL){

303

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

345

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

346

tempdir);

304

347

return false;

305

348

}

306

349

307

350

/* Create new GPGME "context" */

308

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

351

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

309

352

if(rc != GPG_ERR_NO_ERROR){

310

fprintf(stderr, "bad gpgme_new: %s: %s\n",

311

gpgme_strsource(rc), gpgme_strerror(rc));

353

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

354

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

355

gpgme_strerror(rc));

312

356

return false;

313

357

}

314

358

323

367

* Decrypt OpenPGP data.

324

368

* Returns -1 on error

325

369

*/

370

__attribute__((nonnull, warn_unused_result))

326

371

static ssize_t pgp_packet_decrypt(const char *cryptotext,

327

372

size_t crypto_size,

328

char **plaintext){

373

char **plaintext,

374

mandos_context *mc){

329

375

gpgme_data_t dh_crypto, dh_plain;

330

376

gpgme_error_t rc;

331

377

ssize_t ret;

333

379

ssize_t plaintext_length = 0;

334

380

335

381

if(debug){

336

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

382

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

337

383

}

338

384

339

385

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

340

386

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

341

387

0);

342

388

if(rc != GPG_ERR_NO_ERROR){

343

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

344

gpgme_strsource(rc), gpgme_strerror(rc));

389

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

390

gpgme_strsource(rc), gpgme_strerror(rc));

345

391

return -1;

346

392

}

347

393

348

394

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

349

395

rc = gpgme_data_new(&dh_plain);

350

396

if(rc != GPG_ERR_NO_ERROR){

351

fprintf(stderr, "bad gpgme_data_new: %s: %s\n",

352

gpgme_strsource(rc), gpgme_strerror(rc));

397

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

398

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

399

gpgme_strsource(rc), gpgme_strerror(rc));

353

400

gpgme_data_release(dh_crypto);

354

401

return -1;

355

402

}

356

403

357

404

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

358

405

data buffer */

359

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

406

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

360

407

if(rc != GPG_ERR_NO_ERROR){

361

fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",

362

gpgme_strsource(rc), gpgme_strerror(rc));

408

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

409

gpgme_strsource(rc), gpgme_strerror(rc));

363

410

plaintext_length = -1;

364

411

if(debug){

365

412

gpgme_decrypt_result_t result;

366

result = gpgme_op_decrypt_result(mc.ctx);

413

result = gpgme_op_decrypt_result(mc->ctx);

367

414

if(result == NULL){

368

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

415

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

369

416

} else {

370

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

371

result->unsupported_algorithm);

372

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

373

result->wrong_key_usage);

417

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

418

result->unsupported_algorithm);

419

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

420

result->wrong_key_usage);

374

421

if(result->file_name != NULL){

375

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

422

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

376

423

}

377

424

gpgme_recipient_t recipient;

378

425

recipient = result->recipients;

379

426

while(recipient != NULL){

380

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

381

gpgme_pubkey_algo_name(recipient->pubkey_algo));

382

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

383

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

384

recipient->status == GPG_ERR_NO_SECKEY

385

? "No" : "Yes");

427

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

428

gpgme_pubkey_algo_name

429

(recipient->pubkey_algo));

430

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

431

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

432

recipient->status == GPG_ERR_NO_SECKEY

433

? "No" : "Yes");

386

434

recipient = recipient->next;

387

435

}

388

436

}

391

439

}

392

440

393

441

if(debug){

394

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

442

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

395

443

}

396

444

397

445

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

404

452

*plaintext = NULL;

405

453

while(true){

406

454

plaintext_capacity = incbuffer(plaintext,

407

(size_t)plaintext_length,

408

plaintext_capacity);

455

(size_t)plaintext_length,

456

plaintext_capacity);

409

457

if(plaintext_capacity == 0){

410

perror_plus("incbuffer");

411

plaintext_length = -1;

412

goto decrypt_end;

458

perror_plus("incbuffer");

459

plaintext_length = -1;

460

goto decrypt_end;

413

461

}

414

462

415

463

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

428

476

}

429

477

430

478

if(debug){

431

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

479

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

432

480

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

433

481

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

434

482

}

445

493

return plaintext_length;

446

494

}

447

495

448

static const char * safer_gnutls_strerror(int value){

449

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

450

-Wunreachable-code */

496

__attribute__((warn_unused_result))

497

static const char *safer_gnutls_strerror(int value){

498

const char *ret = gnutls_strerror(value);

451

499

if(ret == NULL)

452

500

ret = "(unknown)";

453

501

return ret;

454

502

}

455

503

456

504

/* GnuTLS log function callback */

505

__attribute__((nonnull))

457

506

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

458

507

const char* string){

459

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

508

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

460

509

}

461

510

511

__attribute__((nonnull, warn_unused_result))

462

512

static int init_gnutls_global(const char *pubkeyfilename,

463

const char *seckeyfilename){

513

const char *seckeyfilename,

514

mandos_context *mc){

464

515

int ret;

465

516

466

517

if(debug){

467

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

518

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

468

519

}

469

520

470

521

ret = gnutls_global_init();

471

522

if(ret != GNUTLS_E_SUCCESS){

472

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

473

safer_gnutls_strerror(ret));

523

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

524

safer_gnutls_strerror(ret));

474

525

return -1;

475

526

}

476

527

483

534

}

484

535

485

536

/* OpenPGP credentials */

486

ret = gnutls_certificate_allocate_credentials(&mc.cred);

537

ret = gnutls_certificate_allocate_credentials(&mc->cred);

487

538

if(ret != GNUTLS_E_SUCCESS){

488

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

489

safer_gnutls_strerror(ret));

539

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

540

safer_gnutls_strerror(ret));

490

541

gnutls_global_deinit();

491

542

return -1;

492

543

}

493

544

494

545

if(debug){

495

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

496

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

497

seckeyfilename);

546

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

547

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

548

pubkeyfilename,

549

seckeyfilename);

498

550

}

499

551

500

552

ret = gnutls_certificate_set_openpgp_key_file

501

(mc.cred, pubkeyfilename, seckeyfilename,

553

(mc->cred, pubkeyfilename, seckeyfilename,

502

554

GNUTLS_OPENPGP_FMT_BASE64);

503

555

if(ret != GNUTLS_E_SUCCESS){

504

fprintf(stderr,

505

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

506

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

507

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

508

safer_gnutls_strerror(ret));

556

fprintf_plus(stderr,

557

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

558

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

559

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

560

safer_gnutls_strerror(ret));

509

561

goto globalfail;

510

562

}

511

563

512

564

/* GnuTLS server initialization */

513

ret = gnutls_dh_params_init(&mc.dh_params);

565

ret = gnutls_dh_params_init(&mc->dh_params);

514

566

if(ret != GNUTLS_E_SUCCESS){

515

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

516

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

567

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

568

" initialization: %s\n",

569

safer_gnutls_strerror(ret));

517

570

goto globalfail;

518

571

}

519

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

572

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

520

573

if(ret != GNUTLS_E_SUCCESS){

521

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

522

safer_gnutls_strerror(ret));

574

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

575

safer_gnutls_strerror(ret));

523

576

goto globalfail;

524

577

}

525

578

526

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

579

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

527

580

528

581

return 0;

529

582

530

583

globalfail:

531

584

532

gnutls_certificate_free_credentials(mc.cred);

585

gnutls_certificate_free_credentials(mc->cred);

533

586

gnutls_global_deinit();

534

gnutls_dh_params_deinit(mc.dh_params);

587

gnutls_dh_params_deinit(mc->dh_params);

535

588

return -1;

536

589

}

537

590

538

static int init_gnutls_session(gnutls_session_t *session){

591

__attribute__((nonnull, warn_unused_result))

592

static int init_gnutls_session(gnutls_session_t *session,

593

mandos_context *mc){

539

594

int ret;

540

595

/* GnuTLS session creation */

541

596

do {

545

600

}

546

601

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

547

602

if(ret != GNUTLS_E_SUCCESS){

548

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

549

safer_gnutls_strerror(ret));

603

fprintf_plus(stderr,

604

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

605

safer_gnutls_strerror(ret));

550

606

}

551

607

552

608

{

553

609

const char *err;

554

610

do {

555

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

611

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

556

612

if(quit_now){

557

613

gnutls_deinit(*session);

558

614

return -1;

559

615

}

560

616

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

561

617

if(ret != GNUTLS_E_SUCCESS){

562

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

563

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

564

safer_gnutls_strerror(ret));

618

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

619

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

620

safer_gnutls_strerror(ret));

565

621

gnutls_deinit(*session);

566

622

return -1;

567

623

}

569

625

570

626

do {

571

627

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

572

mc.cred);

628

mc->cred);

573

629

if(quit_now){

574

630

gnutls_deinit(*session);

575

631

return -1;

576

632

}

577

633

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

578

634

if(ret != GNUTLS_E_SUCCESS){

579

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

580

safer_gnutls_strerror(ret));

635

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

636

safer_gnutls_strerror(ret));

581

637

gnutls_deinit(*session);

582

638

return -1;

583

639

}

585

641

/* ignore client certificate if any. */

586

642

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

587

643

588

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

644

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

589

645

590

646

return 0;

591

647

}

595

651

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

596

652

597

653

/* Called when a Mandos server is found */

598

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

654

__attribute__((nonnull, warn_unused_result))

655

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

599

656

AvahiIfIndex if_index,

600

int af){

657

int af, mandos_context *mc){

601

658

int ret, tcp_sd = -1;

602

659

ssize_t sret;

603

union {

604

struct sockaddr_in in;

605

struct sockaddr_in6 in6;

606

} to;

660

struct sockaddr_storage to;

607

661

char *buffer = NULL;

608

662

char *decrypted_buffer = NULL;

609

663

size_t buffer_length = 0;

628

682

pf = PF_INET;

629

683

break;

630

684

default:

631

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

685

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

632

686

errno = EINVAL;

633

687

return -1;

634

688

}

635

689

636

ret = init_gnutls_session(&session);

690

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

691

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

692

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

693

bool match = false;

694

{

695

char *interface = NULL;

696

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

697

interface))){

698

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

699

match = true;

700

break;

701

}

702

}

703

}

704

if(not match){

705

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

706

connect to the server */

707

if(debug){

708

char interface[IF_NAMESIZE];

709

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

710

perror_plus("if_indextoname");

711

} else {

712

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

713

" \"%s\"\n",

714

if_indextoname((unsigned int)if_index,

715

interface));

716

}

717

}

718

return -1;

719

}

720

}

721

722

ret = init_gnutls_session(&session, mc);

637

723

if(ret != 0){

638

724

return -1;

639

725

}

640

726

641

727

if(debug){

642

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

643

"\n", ip, port);

728

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

729

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

644

730

}

645

731

646

732

tcp_sd = socket(pf, SOCK_STREAM, 0);

658

744

659

745

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

660

746

if(af == AF_INET6){

661

to.in6.sin6_family = (sa_family_t)af;

662

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

747

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

748

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

663

749

} else { /* IPv4 */

664

to.in.sin_family = (sa_family_t)af;

665

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

750

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

751

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

666

752

}

667

753

if(ret < 0 ){

668

754

int e = errno;

672

758

}

673

759

if(ret == 0){

674

760

int e = errno;

675

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

761

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

676

762

errno = e;

677

763

goto mandos_end;

678

764

}

679

765

if(af == AF_INET6){

680

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

681

-Wconversion and

682

-Wunreachable-code */

683

684

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

685

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

686

-Wunreachable-code*/

766

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

767

if(IN6_IS_ADDR_LINKLOCAL

768

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

687

769

if(if_index == AVAHI_IF_UNSPEC){

688

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

689

" without a network interface\n");

770

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

771

" incomplete without a network interface\n");

690

772

errno = EINVAL;

691

773

goto mandos_end;

692

774

}

693

775

/* Set the network interface number as scope */

694

to.in6.sin6_scope_id = (uint32_t)if_index;

776

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

695

777

}

696

778

} else {

697

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

698

-Wconversion and

699

-Wunreachable-code */

779

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

700

780

}

701

781

702

782

if(quit_now){

710

790

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

711

791

perror_plus("if_indextoname");

712

792

} else {

713

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

714

ip, interface, port);

793

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

794

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

715

795

}

716

796

} else {

717

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

718

port);

797

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

798

ip, (uintmax_t)port);

719

799

}

720

800

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

721

801

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

722

const char *pcret;

723

802

if(af == AF_INET6){

724

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

725

sizeof(addrstr));

803

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

804

sizeof(struct sockaddr_in6),

805

addrstr, sizeof(addrstr), NULL, 0,

806

NI_NUMERICHOST);

726

807

} else {

727

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

728

sizeof(addrstr));

808

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

809

sizeof(struct sockaddr_in),

810

addrstr, sizeof(addrstr), NULL, 0,

811

NI_NUMERICHOST);

729

812

}

730

if(pcret == NULL){

731

perror_plus("inet_ntop");

732

} else {

733

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

734

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

735

}

813

if(ret == EAI_SYSTEM){

814

perror_plus("getnameinfo");

815

} else if(ret != 0) {

816

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

817

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

818

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

736

819

}

737

820

}

738

821

742

825

}

743

826

744

827

if(af == AF_INET6){

745

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

828

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

829

sizeof(struct sockaddr_in6));

746

830

} else {

747

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

831

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

832

sizeof(struct sockaddr_in));

748

833

}

749

834

if(ret < 0){

750

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

835

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

751

836

int e = errno;

752

837

perror_plus("connect");

753

838

errno = e;

765

850

while(true){

766

851

size_t out_size = strlen(out);

767

852

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

768

out_size - written));

853

out_size - written));

769

854

if(ret == -1){

770

855

int e = errno;

771

856

perror_plus("write");

791

876

}

792

877

793

878

if(debug){

794

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

879

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

795

880

}

796

881

797

882

if(quit_now){

799

884

goto mandos_end;

800

885

}

801

886

802

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

803

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

887

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

888

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

889

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

890

gnutls_transport_set_ptr(session,

891

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

804

892

805

893

if(quit_now){

806

894

errno = EINTR;

817

905

818

906

if(ret != GNUTLS_E_SUCCESS){

819

907

if(debug){

820

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

908

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

821

909

gnutls_perror(ret);

822

910

}

823

911

errno = EPROTO;

827

915

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

828

916

829

917

if(debug){

830

fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",

831

ip);

918

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

919

" %s\n", ip);

832

920

}

833

921

834

922

while(true){

839

927

}

840

928

841

929

buffer_capacity = incbuffer(&buffer, buffer_length,

842

buffer_capacity);

930

buffer_capacity);

843

931

if(buffer_capacity == 0){

844

932

int e = errno;

845

933

perror_plus("incbuffer");

872

960

}

873

961

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

874

962

if(ret < 0){

875

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

963

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

964

"***\n");

876

965

gnutls_perror(ret);

877

966

errno = EPROTO;

878

967

goto mandos_end;

879

968

}

880

969

break;

881

970

default:

882

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

883

" encrypted session with Mandos server\n");

971

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

972

" encrypted session with Mandos server\n");

884

973

gnutls_bye(session, GNUTLS_SHUT_RDWR);

885

974

errno = EIO;

886

975

goto mandos_end;

891

980

}

892

981

893

982

if(debug){

894

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

983

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

895

984

}

896

985

897

986

if(quit_now){

909

998

910

999

if(buffer_length > 0){

911

1000

ssize_t decrypted_buffer_size;

912

decrypted_buffer_size = pgp_packet_decrypt(buffer,

913

buffer_length,

914

&decrypted_buffer);

1001

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

1002

&decrypted_buffer, mc);

915

1003

if(decrypted_buffer_size >= 0){

916

1004

917

1005

written = 0;

927

1015

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

928

1016

int e = errno;

929

1017

if(debug){

930

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

931

strerror(errno));

1018

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

1019

strerror(errno));

932

1020

}

933

1021

errno = e;

934

1022

goto mandos_end;

965

1053

return retval;

966

1054

}

967

1055

1056

__attribute__((nonnull))

968

1057

static void resolve_callback(AvahiSServiceResolver *r,

969

1058

AvahiIfIndex interface,

970

1059

AvahiProtocol proto,

978

1067

AVAHI_GCC_UNUSED AvahiStringList *txt,

979

1068

AVAHI_GCC_UNUSED AvahiLookupResultFlags

980

1069

flags,

981

AVAHI_GCC_UNUSED void* userdata){

982

assert(r);

1070

void *mc){

1071

if(r == NULL){

1072

return;

1073

}

983

1074

984

1075

/* Called whenever a service has been resolved successfully or

985

1076

timed out */

986

1077

987

1078

if(quit_now){

1079

avahi_s_service_resolver_free(r);

988

1080

return;

989

1081

}

990

1082

991

1083

switch(event){

992

1084

default:

993

1085

case AVAHI_RESOLVER_FAILURE:

994

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

995

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

996

avahi_strerror(avahi_server_errno(mc.server)));

1086

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

1087

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

1088

domain,

1089

avahi_strerror(avahi_server_errno

1090

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

997

1091

break;

998

1092

999

1093

case AVAHI_RESOLVER_FOUND:

1001

1095

char ip[AVAHI_ADDRESS_STR_MAX];

1002

1096

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

1003

1097

if(debug){

1004

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

1005

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

1006

ip, (intmax_t)interface, port);

1098

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

1099

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

1100

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

1007

1101

}

1008

int ret = start_mandos_communication(ip, port, interface,

1009

avahi_proto_to_af(proto));

1102

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

1103

interface,

1104

avahi_proto_to_af(proto),

1105

mc);

1010

1106

if(ret == 0){

1011

avahi_simple_poll_quit(mc.simple_poll);

1107

avahi_simple_poll_quit(simple_poll);

1012

1108

} else {

1013

ret = add_server(ip, port, interface,

1014

avahi_proto_to_af(proto));

1109

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

1110

avahi_proto_to_af(proto),

1111

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

1112

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

1113

" list\n", name);

1114

}

1015

1115

}

1016

1116

}

1017

1117

}

1027

1127

const char *domain,

1028

1128

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1029

1129

flags,

1030

AVAHI_GCC_UNUSED void* userdata){

1031

assert(b);

1130

void *mc){

1131

if(b == NULL){

1132

return;

1133

}

1032

1134

1033

1135

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

1034

1136

is removed from the LAN */

1041

1143

default:

1042

1144

case AVAHI_BROWSER_FAILURE:

1043

1145

1044

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

1045

avahi_strerror(avahi_server_errno(mc.server)));

1046

avahi_simple_poll_quit(mc.simple_poll);

1146

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

1147

avahi_strerror(avahi_server_errno

1148

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

1149

avahi_simple_poll_quit(simple_poll);

1047

1150

return;

1048

1151

1049

1152

case AVAHI_BROWSER_NEW:

1052

1155

the callback function is called the Avahi server will free the

1053

1156

resolver for us. */

1054

1157

1055

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

1056

name, type, domain, protocol, 0,

1057

resolve_callback, NULL) == NULL)

1058

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

1059

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

1158

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

1159

interface, protocol, name, type,

1160

domain, protocol, 0,

1161

resolve_callback, mc) == NULL)

1162

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

1163

" %s\n", name,

1164

avahi_strerror(avahi_server_errno

1165

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

1060

1166

break;

1061

1167

1062

1168

case AVAHI_BROWSER_REMOVE:

1065

1171

case AVAHI_BROWSER_ALL_FOR_NOW:

1066

1172

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1067

1173

if(debug){

1068

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

1174

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

1175

" searching...\n");

1069

1176

}

1070

1177

break;

1071

1178

}

1080

1187

signal_received = sig;

1081

1188

int old_errno = errno;

1082

1189

/* set main loop to exit */

1083

if(mc.simple_poll != NULL){

1084

avahi_simple_poll_quit(mc.simple_poll);

1190

if(simple_poll != NULL){

1191

avahi_simple_poll_quit(simple_poll);

1085

1192

}

1086

1193

errno = old_errno;

1087

1194

}

1088

1195

1196

__attribute__((nonnull, warn_unused_result))

1089

1197

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

1090

1198

int ret;

1199

error_t ret_errno;

1091

1200

1092

1201

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

1093

1202

if(s < 0){

1203

ret_errno = errno;

1094

1204

perror_plus("socket");

1205

errno = ret_errno;

1095

1206

return false;

1096

1207

}

1097

1208

strcpy(ifr->ifr_name, ifname);

1098

1209

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1099

1210

if(ret == -1){

1100

1211

if(debug){

1212

ret_errno = errno;

1101

1213

perror_plus("ioctl SIOCGIFFLAGS");

1214

errno = ret_errno;

1102

1215

}

1103

1216

return false;

1104

1217

}

1105

1218

return true;

1106

1219

}

1107

1220

1221

__attribute__((nonnull, warn_unused_result))

1108

1222

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

1109

1223

1110

1224

/* Reject the loopback device */

1111

1225

if(ifr->ifr_flags & IFF_LOOPBACK){

1112

1226

if(debug){

1113

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

1114

ifname);

1227

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

1228

ifname);

1115

1229

}

1116

1230

return false;

1117

1231

}

1118

1232

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

1119

1233

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

1120

1234

if(debug){

1121

fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",

1122

ifname);

1235

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

1236

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

1123

1237

}

1124

1238

return true;

1125

1239

}

1126

1240

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

1127

1241

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

1128

1242

if(debug){

1129

fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",

1130

ifname);

1243

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1244

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

1131

1245

}

1132

1246

return false;

1133

1247

}

1134

1248

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

1135

1249

if(ifr->ifr_flags & IFF_NOARP){

1136

1250

if(debug){

1137

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

1251

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

1252

ifname);

1138

1253

}

1139

1254

return false;

1140

1255

}

1141

1256

1142

1257

/* Accept this device */

1143

1258

if(debug){

1144

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

1259

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

1145

1260

}

1146

1261

return true;

1147

1262

}

1151

1266

* corresponds to an acceptable network device.

1152

1267

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

1153

1268

*/

1269

__attribute__((nonnull, warn_unused_result))

1154

1270

int good_interface(const struct dirent *if_entry){

1155

1271

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

1156

1272

return 0;

1159

1275

struct ifreq ifr;

1160

1276

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

1161

1277

if(debug){

1162

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

1163

if_entry->d_name);

1164

}

1165

return 0;

1166

}

1167

1168

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

1169

return 0;

1170

}

1171

return 1;

1172

}

1173

1174

/*

1175

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

1176

* corresponds to an acceptable network device which is up.

1177

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

1178

*/

1179

int up_interface(const struct dirent *if_entry){

1180

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

1181

return 0;

1182

}

1183

1184

struct ifreq ifr;

1185

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

1186

if(debug){

1187

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

1188

if_entry->d_name);

1189

}

1190

return 0;

1191

}

1192

1193

/* Reject down interfaces */

1194

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

1195

if(debug){

1196

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

1197

if_entry->d_name);

1198

}

1199

return 0;

1200

}

1201

1202

/* Reject non-running interfaces */

1203

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

1204

if(debug){

1205

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

1206

if_entry->d_name);

1207

}

1208

return 0;

1209

}

1210

1211

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

1212

return 0;

1213

}

1214

return 1;

1215

}

1216

1278

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

1279

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

1280

}

1281

return 0;

1282

}

1283

1284

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

1285

return 0;

1286

}

1287

return 1;

1288

}

1289

1290

/*

1291

* This function determines if a network interface is up.

1292

*/

1293

__attribute__((nonnull, warn_unused_result))

1294

bool interface_is_up(const char *interface){

1295

struct ifreq ifr;

1296

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

1297

if(debug){

1298

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

1299

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

1300

}

1301

return false;

1302

}

1303

1304

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

1305

}

1306

1307

/*

1308

* This function determines if a network interface is running

1309

*/

1310

__attribute__((nonnull, warn_unused_result))

1311

bool interface_is_running(const char *interface){

1312

struct ifreq ifr;

1313

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

1314

if(debug){

1315

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

1316

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

1317

}

1318

return false;

1319

}

1320

1321

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

1322

}

1323

1324

__attribute__((nonnull, pure, warn_unused_result))

1217

1325

int notdotentries(const struct dirent *direntry){

1218

1326

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

1219

1327

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

1226

1334

}

1227

1335

1228

1336

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

1337

__attribute__((nonnull, warn_unused_result))

1229

1338

int runnable_hook(const struct dirent *direntry){

1230

1339

int ret;

1340

size_t sret;

1231

1341

struct stat st;

1232

1342

1233

1343

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

1235

1345

return 0;

1236

1346

}

1237

1347

1238

/* Save pointer to last character */

1239

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

1240

1241

if(*end == '~'){

1242

/* Backup name~ */

1243

return 0;

1244

}

1245

1246

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

1247

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

1248

/* Temporary #name# */

1249

return 0;

1250

}

1251

1252

/* XXX more rules here */

1253

1254

ret = stat(direntry->d_name, &st);

1348

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

1349

"abcdefghijklmnopqrstuvwxyz"

1350

"0123456789"

1351

"_.-");

1352

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

1353

/* Contains non-allowed characters */

1354

if(debug){

1355

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

1356

direntry->d_name);

1357

}

1358

return 0;

1359

}

1360

1361

ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);

1255

1362

if(ret == -1){

1256

1363

if(debug){

1257

perror_plus("Could not stat plugin");

1364

perror_plus("Could not stat hook");

1258

1365

}

1259

1366

return 0;

1260

1367

}

1261

1368

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

1262

1369

/* Not a regular file */

1370

if(debug){

1371

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

1372

direntry->d_name);

1373

}

1263

1374

return 0;

1264

1375

}

1265

1376

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

1266

1377

/* Not executable */

1378

if(debug){

1379

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

1380

direntry->d_name);

1381

}

1267

1382

return 0;

1268

1383

}

1384

if(debug){

1385

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

1386

direntry->d_name);

1387

}

1269

1388

return 1;

1270

1389

}

1271

1390

1272

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1391

__attribute__((nonnull, warn_unused_result))

1392

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1393

mandos_context *mc){

1273

1394

int ret;

1274

1395

struct timespec now;

1275

1396

struct timespec waited_time;

1276

1397

intmax_t block_time;

1277

1398

1278

1399

while(true){

1279

if(mc.current_server == NULL){

1280

if (debug){

1281

fprintf(stderr,

1282

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

1400

if(mc->current_server == NULL){

1401

if(debug){

1402

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

1403

" No timeout!\n");

1283

1404

}

1284

1405

ret = avahi_simple_poll_iterate(s, -1);

1285

1406

} else {

1286

if (debug){

1287

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

1288

" or wait\n");

1407

if(debug){

1408

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

1409

" it, or wait\n");

1289

1410

}

1290

1411

/* the current time */

1291

1412

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1296

1417

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

1297

1418

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

1298

1419

waited_time.tv_sec = (now.tv_sec

1299

- mc.current_server->last_seen.tv_sec);

1420

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

1300

1421

waited_time.tv_nsec = (now.tv_nsec

1301

- mc.current_server->last_seen.tv_nsec);

1422

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

1302

1423

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

1303

1424

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

1304

1425

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

1306

1427

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

1307

1428

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

1308

1429

1309

if (debug){

1310

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

1430

if(debug){

1431

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

1432

block_time);

1311

1433

}

1312

1434

1313

1435

if(block_time <= 0){

1314

ret = start_mandos_communication(mc.current_server->ip,

1315

mc.current_server->port,

1316

mc.current_server->if_index,

1317

mc.current_server->af);

1436

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

1437

mc->current_server->port,

1438

mc->current_server->if_index,

1439

mc->current_server->af, mc);

1318

1440

if(ret == 0){

1319

avahi_simple_poll_quit(mc.simple_poll);

1441

avahi_simple_poll_quit(s);

1320

1442

return 0;

1321

1443

}

1322

1444

ret = clock_gettime(CLOCK_MONOTONIC,

1323

&mc.current_server->last_seen);

1445

&mc->current_server->last_seen);

1324

1446

if(ret == -1){

1325

1447

perror_plus("clock_gettime");

1326

1448

return -1;

1327

1449

}

1328

mc.current_server = mc.current_server->next;

1450

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

1329

1451

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

1330

1452

servers, but don't block */

1331

1453

}

1333

1455

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

1334

1456

}

1335

1457

if(ret != 0){

1336

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

1458

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

1337

1459

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

1338

1460

}

1339

1461

}

1340

1462

}

1341

1463

}

1342

1464

1465

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

1466

__attribute__((warn_unused_result))

1467

error_t raise_privileges(void){

1468

error_t old_errno = errno;

1469

error_t ret_errno = 0;

1470

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

1471

ret_errno = errno;

1472

}

1473

errno = old_errno;

1474

return ret_errno;

1475

}

1476

1477

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

1478

__attribute__((warn_unused_result))

1479

error_t raise_privileges_permanently(void){

1480

error_t old_errno = errno;

1481

error_t ret_errno = raise_privileges();

1482

if(ret_errno != 0){

1483

errno = old_errno;

1484

return ret_errno;

1485

}

1486

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

1487

ret_errno = errno;

1488

}

1489

errno = old_errno;

1490

return ret_errno;

1491

}

1492

1493

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

1494

__attribute__((warn_unused_result))

1495

error_t lower_privileges(void){

1496

error_t old_errno = errno;

1497

error_t ret_errno = 0;

1498

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

1499

ret_errno = errno;

1500

}

1501

errno = old_errno;

1502

return ret_errno;

1503

}

1504

1505

/* Lower privileges permanently */

1506

__attribute__((warn_unused_result))

1507

error_t lower_privileges_permanently(void){

1508

error_t old_errno = errno;

1509

error_t ret_errno = 0;

1510

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

1511

ret_errno = errno;

1512

}

1513

errno = old_errno;

1514

return ret_errno;

1515

}

1516

1517

__attribute__((nonnull))

1518

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

1519

const float delay){

1520

struct dirent **direntries = NULL;

1521

if(hookdir_fd == -1){

1522

hookdir_fd = open(hookdir, O_RDONLY);

1523

if(hookdir_fd == -1){

1524

if(errno == ENOENT){

1525

if(debug){

1526

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

1527

" found\n", hookdir);

1528

}

1529

} else {

1530

perror_plus("open");

1531

}

1532

return;

1533

}

1534

}

1535

#ifdef __GLIBC__

1536

#if __GLIBC_PREREQ(2, 15)

1537

int numhooks = scandirat(hookdir_fd, ".", &direntries,

1538

runnable_hook, alphasort);

1539

#else /* not __GLIBC_PREREQ(2, 15) */

1540

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

1541

alphasort);

1542

#endif /* not __GLIBC_PREREQ(2, 15) */

1543

#else /* not __GLIBC__ */

1544

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

1545

alphasort);

1546

#endif /* not __GLIBC__ */

1547

if(numhooks == -1){

1548

perror_plus("scandir");

1549

return;

1550

}

1551

struct dirent *direntry;

1552

int ret;

1553

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

1554

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

1555

direntry = direntries[i];

1556

if(debug){

1557

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

1558

direntry->d_name);

1559

}

1560

pid_t hook_pid = fork();

1561

if(hook_pid == 0){

1562

/* Child */

1563

/* Raise privileges */

1564

errno = raise_privileges_permanently();

1565

if(errno != 0){

1566

perror_plus("Failed to raise privileges");

1567

_exit(EX_NOPERM);

1568

}

1569

/* Set group */

1570

errno = 0;

1571

ret = setgid(0);

1572

if(ret == -1){

1573

perror_plus("setgid");

1574

_exit(EX_NOPERM);

1575

}

1576

/* Reset supplementary groups */

1577

errno = 0;

1578

ret = setgroups(0, NULL);

1579

if(ret == -1){

1580

perror_plus("setgroups");

1581

_exit(EX_NOPERM);

1582

}

1583

ret = dup2(devnull, STDIN_FILENO);

1584

if(ret == -1){

1585

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

1586

_exit(EX_OSERR);

1587

}

1588

ret = close(devnull);

1589

if(ret == -1){

1590

perror_plus("close");

1591

_exit(EX_OSERR);

1592

}

1593

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1594

if(ret == -1){

1595

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

1596

_exit(EX_OSERR);

1597

}

1598

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

1599

if(ret == -1){

1600

perror_plus("setenv");

1601

_exit(EX_OSERR);

1602

}

1603

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

1604

if(ret == -1){

1605

perror_plus("setenv");

1606

_exit(EX_OSERR);

1607

}

1608

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

1609

if(ret == -1){

1610

perror_plus("setenv");

1611

_exit(EX_OSERR);

1612

}

1613

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

1614

if(ret == -1){

1615

perror_plus("setenv");

1616

_exit(EX_OSERR);

1617

}

1618

char *delaystring;

1619

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

1620

if(ret == -1){

1621

perror_plus("asprintf");

1622

_exit(EX_OSERR);

1623

}

1624

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

1625

if(ret == -1){

1626

free(delaystring);

1627

perror_plus("setenv");

1628

_exit(EX_OSERR);

1629

}

1630

free(delaystring);

1631

if(connect_to != NULL){

1632

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

1633

if(ret == -1){

1634

perror_plus("setenv");

1635

_exit(EX_OSERR);

1636

}

1637

}

1638

int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);

1639

if(hook_fd == -1){

1640

perror_plus("openat");

1641

_exit(EXIT_FAILURE);

1642

}

1643

if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){

1644

perror_plus("close");

1645

_exit(EXIT_FAILURE);

1646

}

1647

if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },

1648

environ) == -1){

1649

perror_plus("fexecve");

1650

_exit(EXIT_FAILURE);

1651

}

1652

} else {

1653

int status;

1654

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

1655

perror_plus("waitpid");

1656

free(direntry);

1657

continue;

1658

}

1659

if(WIFEXITED(status)){

1660

if(WEXITSTATUS(status) != 0){

1661

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

1662

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

1663

WEXITSTATUS(status));

1664

free(direntry);

1665

continue;

1666

}

1667

} else if(WIFSIGNALED(status)){

1668

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

1669

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

1670

WTERMSIG(status));

1671

free(direntry);

1672

continue;

1673

} else {

1674

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

1675

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

1676

free(direntry);

1677

continue;

1678

}

1679

}

1680

if(debug){

1681

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

1682

direntry->d_name);

1683

}

1684

free(direntry);

1685

}

1686

free(direntries);

1687

if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){

1688

perror_plus("close");

1689

} else {

1690

hookdir_fd = -1;

1691

}

1692

close(devnull);

1693

}

1694

1695

__attribute__((nonnull, warn_unused_result))

1696

error_t bring_up_interface(const char *const interface,

1697

const float delay){

1698

error_t old_errno = errno;

1699

int ret;

1700

struct ifreq network;

1701

unsigned int if_index = if_nametoindex(interface);

1702

if(if_index == 0){

1703

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

1704

errno = old_errno;

1705

return ENXIO;

1706

}

1707

1708

if(quit_now){

1709

errno = old_errno;

1710

return EINTR;

1711

}

1712

1713

if(not interface_is_up(interface)){

1714

error_t ret_errno = 0, ioctl_errno = 0;

1715

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

1716

ret_errno = errno;

1717

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

1718

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

1719

errno = old_errno;

1720

return ret_errno;

1721

}

1722

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

1723

1724

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

1725

if(sd == -1){

1726

ret_errno = errno;

1727

perror_plus("socket");

1728

errno = old_errno;

1729

return ret_errno;

1730

}

1731

1732

if(quit_now){

1733

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

1734

if(ret == -1){

1735

perror_plus("close");

1736

}

1737

errno = old_errno;

1738

return EINTR;

1739

}

1740

1741

if(debug){

1742

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

1743

interface);

1744

}

1745

1746

/* Raise privileges */

1747

ret_errno = raise_privileges();

1748

if(ret_errno != 0){

1749

errno = ret_errno;

1750

perror_plus("Failed to raise privileges");

1751

}

1752

1753

#ifdef __linux__

1754

int ret_linux;

1755

bool restore_loglevel = false;

1756

if(ret_errno == 0){

1757

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1758

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

1759

ret_linux = klogctl(8, NULL, 5);

1760

if(ret_linux == -1){

1761

perror_plus("klogctl");

1762

} else {

1763

restore_loglevel = true;

1764

}

1765

}

1766

#endif /* __linux__ */

1767

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

1768

ioctl_errno = errno;

1769

#ifdef __linux__

1770

if(restore_loglevel){

1771

ret_linux = klogctl(7, NULL, 0);

1772

if(ret_linux == -1){

1773

perror_plus("klogctl");

1774

}

1775

}

1776

#endif /* __linux__ */

1777

1778

/* If raise_privileges() succeeded above */

1779

if(ret_errno == 0){

1780

/* Lower privileges */

1781

ret_errno = lower_privileges();

1782

if(ret_errno != 0){

1783

errno = ret_errno;

1784

perror_plus("Failed to lower privileges");

1785

}

1786

}

1787

1788

/* Close the socket */

1789

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

1790

if(ret == -1){

1791

perror_plus("close");

1792

}

1793

1794

if(ret_setflags == -1){

1795

errno = ioctl_errno;

1796

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1797

errno = old_errno;

1798

return ioctl_errno;

1799

}

1800

} else if(debug){

1801

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

1802

interface);

1803

}

1804

1805

/* Sleep checking until interface is running.

1806

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

1807

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

1808

if(interface_is_running(interface)){

1809

break;

1810

}

1811

struct timespec sleeptime = { .tv_nsec = 250000000 };

1812

ret = nanosleep(&sleeptime, NULL);

1813

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

1814

perror_plus("nanosleep");

1815

}

1816

}

1817

1818

errno = old_errno;

1819

return 0;

1820

}

1821

1822

__attribute__((nonnull, warn_unused_result))

1823

error_t take_down_interface(const char *const interface){

1824

error_t old_errno = errno;

1825

struct ifreq network;

1826

unsigned int if_index = if_nametoindex(interface);

1827

if(if_index == 0){

1828

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

1829

errno = old_errno;

1830

return ENXIO;

1831

}

1832

if(interface_is_up(interface)){

1833

error_t ret_errno = 0, ioctl_errno = 0;

1834

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

1835

ret_errno = errno;

1836

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

1837

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

1838

errno = old_errno;

1839

return ret_errno;

1840

}

1841

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

1842

1843

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

1844

if(sd == -1){

1845

ret_errno = errno;

1846

perror_plus("socket");

1847

errno = old_errno;

1848

return ret_errno;

1849

}

1850

1851

if(debug){

1852

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

1853

interface);

1854

}

1855

1856

/* Raise privileges */

1857

ret_errno = raise_privileges();

1858

if(ret_errno != 0){

1859

errno = ret_errno;

1860

perror_plus("Failed to raise privileges");

1861

}

1862

1863

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

1864

ioctl_errno = errno;

1865

1866

/* If raise_privileges() succeeded above */

1867

if(ret_errno == 0){

1868

/* Lower privileges */

1869

ret_errno = lower_privileges();

1870

if(ret_errno != 0){

1871

errno = ret_errno;

1872

perror_plus("Failed to lower privileges");

1873

}

1874

}

1875

1876

/* Close the socket */

1877

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

1878

if(ret == -1){

1879

perror_plus("close");

1880

}

1881

1882

if(ret_setflags == -1){

1883

errno = ioctl_errno;

1884

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1885

errno = old_errno;

1886

return ioctl_errno;

1887

}

1888

} else if(debug){

1889

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

1890

interface);

1891

}

1892

1893

errno = old_errno;

1894

return 0;

1895

}

1896

1343

1897

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

1898

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

1899

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

1900

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

1901

.interfaces = NULL, .interfaces_size = 0 };

1344

1902

AvahiSServiceBrowser *sb = NULL;

1345

int error;

1903

error_t ret_errno;

1346

1904

int ret;

1347

1905

intmax_t tmpmax;

1348

1906

char *tmp;

1349

1907

int exitcode = EXIT_SUCCESS;

1350

const char *interface = "";

1351

struct ifreq network;

1352

int sd = -1;

1353

bool take_down_interface = false;

1354

uid_t uid;

1355

gid_t gid;

1356

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

1357

bool tempdir_created = false;

1908

char *interfaces_to_take_down = NULL;

1909

size_t interfaces_to_take_down_size = 0;

1910

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

1911

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

1912

char *tempdir = NULL;

1358

1913

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1359

1914

const char *seckey = PATHDIR "/" SECKEY;

1360

1915

const char *pubkey = PATHDIR "/" PUBKEY;

1916

char *interfaces_hooks = NULL;

1361

1917

1362

1918

bool gnutls_initialized = false;

1363

1919

bool gpgme_initialized = false;

1425

1981

.group = 2 },

1426

1982

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

1427

1983

.arg = "SECONDS",

1428

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

1984

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

1985

.group = 2 },

1986

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

1987

.arg = "DIR",

1988

.doc = "Directory where network hooks are located",

1429

1989

.group = 2 },

1430

1990

/*

1431

1991

* These reproduce what we would get without ARGP_NO_HELP

1450

2010

connect_to = arg;

1451

2011

break;

1452

2012

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

1453

interface = arg;

2013

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

2014

arg, (int)',');

2015

if(ret_errno != 0){

2016

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

2017

}

1454

2018

break;

1455

2019

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

1456

2020

seckey = arg;

1485

2049

argp_error(state, "Bad retry interval");

1486

2050

}

1487

2051

break;

2052

case 133: /* --network-hook-dir */

2053

hookdir = arg;

2054

break;

1488

2055

/*

1489

2056

* These reproduce what we would get without ARGP_NO_HELP

1490

2057

*/

1496

2063

argp_state_help(state, state->out_stream,

1497

2064

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1498

2065

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

1499

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

2066

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

1500

2067

exit(argp_err_exit_status);

1501

2068

break;

1502

2069

default:

1529

2096

{

1530

2097

/* Work around Debian bug #633582:

1531

2098

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

1532

struct stat st;

1533

1534

/* Re-raise priviliges */

1535

errno = 0;

1536

ret = seteuid(0);

1537

if(ret == -1){

1538

perror_plus("seteuid");

1539

}

1540

1541

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

1542

int seckey_fd = open(seckey, O_RDONLY);

1543

if(seckey_fd == -1){

1544

perror_plus("open");

1545

} else {

1546

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

1547

if(ret == -1){

1548

perror_plus("fstat");

1549

} else {

1550

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

1551

ret = fchown(seckey_fd, uid, gid);

1552

if(ret == -1){

1553

perror_plus("fchown");

1554

}

1555

}

1556

}

1557

TEMP_FAILURE_RETRY(close(seckey_fd));

1558

}

1559

}

1560

1561

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

1562

int pubkey_fd = open(pubkey, O_RDONLY);

1563

if(pubkey_fd == -1){

1564

perror_plus("open");

1565

} else {

1566

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

1567

if(ret == -1){

1568

perror_plus("fstat");

1569

} else {

1570

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

1571

ret = fchown(pubkey_fd, uid, gid);

1572

if(ret == -1){

1573

perror_plus("fchown");

1574

}

1575

}

1576

}

1577

TEMP_FAILURE_RETRY(close(pubkey_fd));

1578

}

1579

}

1580

1581

/* Lower privileges */

1582

errno = 0;

1583

ret = seteuid(uid);

1584

if(ret == -1){

1585

perror_plus("seteuid");

1586

}

1587

}

1588

1589

/* Find network hooks and run them */

1590

{

1591

struct dirent **direntries;

1592

struct dirent *direntry;

1593

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

1594

alphasort);

1595

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

1596

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

1597

direntry = direntries[0];

1598

char *fullname = NULL;

1599

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

1600

direntry->d_name);

1601

if(ret < 0){

1602

perror_plus("asprintf");

1603

continue;

1604

}

1605

pid_t hook_pid = fork();

1606

if(hook_pid == 0){

1607

/* Child */

1608

dup2(devnull, STDIN_FILENO);

1609

close(devnull);

1610

dup2(STDERR_FILENO, STDOUT_FILENO);

1611

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

1612

if(ret == -1){

1613

perror_plus("setenv");

1614

exit(1);

1615

}

1616

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

1617

if(ret == -1){

1618

perror_plus("setenv");

1619

exit(1);

1620

}

1621

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

1622

if(ret == -1){

1623

perror_plus("setenv");

1624

exit(1);

1625

}

1626

char *delaystring;

1627

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

1628

if(ret == -1){

1629

perror_plus("asprintf");

1630

exit(1);

1631

}

1632

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

1633

if(ret == -1){

1634

free(delaystring);

1635

perror_plus("setenv");

1636

exit(1);

1637

}

1638

free(delaystring);

1639

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

1640

perror_plus("execl");

1641

}

1642

free(fullname);

1643

if(quit_now){

2099

2100

/* Re-raise privileges */

2101

ret_errno = raise_privileges();

2102

if(ret_errno != 0){

2103

errno = ret_errno;

2104

perror_plus("Failed to raise privileges");

2105

} else {

2106

struct stat st;

2107

2108

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

2109

int seckey_fd = open(seckey, O_RDONLY);

2110

if(seckey_fd == -1){

2111

perror_plus("open");

2112

} else {

2113

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

2114

if(ret == -1){

2115

perror_plus("fstat");

2116

} else {

2117

if(S_ISREG(st.st_mode)

2118

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

2119

ret = fchown(seckey_fd, uid, gid);

2120

if(ret == -1){

2121

perror_plus("fchown");

2122

}

2123

}

2124

}

2125

TEMP_FAILURE_RETRY(close(seckey_fd));

2126

}

2127

}

2128

2129

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

2130

int pubkey_fd = open(pubkey, O_RDONLY);

2131

if(pubkey_fd == -1){

2132

perror_plus("open");

2133

} else {

2134

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

2135

if(ret == -1){

2136

perror_plus("fstat");

2137

} else {

2138

if(S_ISREG(st.st_mode)

2139

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

2140

ret = fchown(pubkey_fd, uid, gid);

2141

if(ret == -1){

2142

perror_plus("fchown");

2143

}

2144

}

2145

}

2146

TEMP_FAILURE_RETRY(close(pubkey_fd));

2147

}

2148

}

2149

2150

/* Lower privileges */

2151

ret_errno = lower_privileges();

2152

if(ret_errno != 0){

2153

errno = ret_errno;

2154

perror_plus("Failed to lower privileges");

2155

}

2156

}

2157

}

2158

2159

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

2160

{

2161

char *interface = NULL;

2162

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

2163

interface))){

2164

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

2165

and if_nametoindex(interface) == 0){

2166

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

2167

fprintf_plus(stderr, "Not using nonexisting interface"

2168

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

2169

}

2170

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

2171

interface = NULL;

2172

}

2173

}

2174

}

2175

2176

/* Run network hooks */

2177

{

2178

if(mc.interfaces != NULL){

2179

interfaces_hooks = malloc(mc.interfaces_size);

2180

if(interfaces_hooks == NULL){

2181

perror_plus("malloc");

1644

2182

goto end;

1645

2183

}

2184

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

2185

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

1646

2186

}

1647

close(devnull);

2187

run_network_hooks("start", interfaces_hooks != NULL ?

2188

interfaces_hooks : "", delay);

1648

2189

}

1649

2190

1650

2191

if(not debug){

1651

2192

avahi_set_log_function(empty_log);

1652

2193

}

1653

2194

1654

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

1655

struct dirent **direntries;

1656

/* First look for interfaces that are up */

1657

ret = scandir(sys_class_net, &direntries, up_interface,

1658

alphasort);

1659

if(ret == 0){

1660

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

1661

free(direntries);

1662

ret = scandir(sys_class_net, &direntries, good_interface,

1663

alphasort);

1664

}

1665

if(ret >= 1){

1666

/* Pick the first interface returned */

1667

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

1668

if(debug){

1669

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

1670

}

1671

if(interface == NULL){

1672

perror_plus("malloc");

1673

free(direntries);

1674

exitcode = EXIT_FAILURE;

1675

goto end;

1676

}

1677

free(direntries);

1678

} else {

1679

free(direntries);

1680

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

1681

exitcode = EXIT_FAILURE;

1682

goto end;

1683

}

1684

}

1685

1686

2195

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

1687

2196

from the signal handler */

1688

2197

/* Initialize the pseudo-RNG for Avahi */

1689

2198

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

1690

mc.simple_poll = avahi_simple_poll_new();

1691

if(mc.simple_poll == NULL){

1692

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

2199

simple_poll = avahi_simple_poll_new();

2200

if(simple_poll == NULL){

2201

fprintf_plus(stderr,

2202

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

1693

2203

exitcode = EX_UNAVAILABLE;

1694

2204

goto end;

1695

2205

}

1757

2267

}

1758

2268

}

1759

2269

1760

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

1761

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

1762

if_index = (AvahiIfIndex) if_nametoindex(interface);

1763

if(if_index == 0){

1764

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

1765

exitcode = EX_UNAVAILABLE;

1766

goto end;

1767

}

1768

1769

if(quit_now){

1770

goto end;

1771

}

1772

1773

/* Re-raise priviliges */

1774

errno = 0;

1775

ret = seteuid(0);

1776

if(ret == -1){

1777

perror_plus("seteuid");

1778

}

1779

1780

#ifdef __linux__

1781

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1782

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

1783

ret = klogctl(8, NULL, 5);

1784

bool restore_loglevel = true;

1785

if(ret == -1){

1786

restore_loglevel = false;

1787

perror_plus("klogctl");

1788

}

1789

#endif /* __linux__ */

1790

1791

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1792

if(sd < 0){

1793

perror_plus("socket");

1794

exitcode = EX_OSERR;

1795

#ifdef __linux__

1796

if(restore_loglevel){

1797

ret = klogctl(7, NULL, 0);

1798

if(ret == -1){

1799

perror_plus("klogctl");

1800

}

1801

}

1802

#endif /* __linux__ */

1803

/* Lower privileges */

1804

errno = 0;

1805

ret = seteuid(uid);

1806

if(ret == -1){

1807

perror_plus("seteuid");

1808

}

1809

goto end;

1810

}

1811

strcpy(network.ifr_name, interface);

1812

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

1813

if(ret == -1){

1814

perror_plus("ioctl SIOCGIFFLAGS");

1815

#ifdef __linux__

1816

if(restore_loglevel){

1817

ret = klogctl(7, NULL, 0);

1818

if(ret == -1){

1819

perror_plus("klogctl");

1820

}

1821

}

1822

#endif /* __linux__ */

1823

exitcode = EX_OSERR;

1824

/* Lower privileges */

1825

errno = 0;

1826

ret = seteuid(uid);

1827

if(ret == -1){

1828

perror_plus("seteuid");

1829

}

1830

goto end;

1831

}

1832

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

1833

network.ifr_flags |= IFF_UP;

1834

take_down_interface = true;

1835

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

1836

if(ret == -1){

1837

take_down_interface = false;

1838

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1839

exitcode = EX_OSERR;

1840

#ifdef __linux__

1841

if(restore_loglevel){

1842

ret = klogctl(7, NULL, 0);

1843

if(ret == -1){

1844

perror_plus("klogctl");

2270

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

2271

if(mc.interfaces == NULL){

2272

struct dirent **direntries = NULL;

2273

/* Look for any good interfaces */

2274

ret = scandir(sys_class_net, &direntries, good_interface,

2275

alphasort);

2276

if(ret >= 1){

2277

/* Add all found interfaces to interfaces list */

2278

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

2279

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

2280

direntries[i]->d_name);

2281

if(ret_errno != 0){

2282

errno = ret_errno;

2283

perror_plus("argz_add");

2284

free(direntries[i]);

2285

continue;

2286

}

2287

if(debug){

2288

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

2289

direntries[i]->d_name);

2290

}

2291

free(direntries[i]);

2292

}

2293

free(direntries);

2294

} else {

2295

if(ret == 0){

2296

free(direntries);

2297

}

2298

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

2299

exitcode = EXIT_FAILURE;

2300

goto end;

2301

}

2302

}

2303

2304

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

2305

{

2306

char *interface = NULL;

2307

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

2308

interface))){

2309

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

2310

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

2311

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

2312

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

2313

interface);

2314

interface = NULL;

2315

while((interface = argz_next(mc.interfaces,

2316

mc.interfaces_size, interface))){

2317

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

2318

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

2319

interface);

2320

interface = NULL;

1845

2321

}

1846

2322

}

1847

#endif /* __linux__ */

1848

/* Lower privileges */

1849

errno = 0;

1850

ret = seteuid(uid);

1851

if(ret == -1){

1852

perror_plus("seteuid");

1853

}

1854

goto end;

1855

}

1856

}

1857

/* Sleep checking until interface is running.

1858

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

1859

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

1860

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

1861

if(ret == -1){

1862

perror_plus("ioctl SIOCGIFFLAGS");

1863

} else if(network.ifr_flags & IFF_RUNNING){

1864

2323

break;

1865

2324

}

1866

struct timespec sleeptime = { .tv_nsec = 250000000 };

1867

ret = nanosleep(&sleeptime, NULL);

1868

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

1869

perror_plus("nanosleep");

1870

}

1871

}

1872

if(not take_down_interface){

1873

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

1874

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

1875

if(ret == -1){

1876

perror_plus("close");

1877

}

1878

}

1879

#ifdef __linux__

1880

if(restore_loglevel){

1881

/* Restores kernel loglevel to default */

1882

ret = klogctl(7, NULL, 0);

1883

if(ret == -1){

1884

perror_plus("klogctl");

1885

}

1886

}

1887

#endif /* __linux__ */

1888

/* Lower privileges */

1889

errno = 0;

1890

if(take_down_interface){

1891

/* Lower privileges */

1892

ret = seteuid(uid);

1893

if(ret == -1){

1894

perror_plus("seteuid");

1895

}

1896

} else {

1897

/* Lower privileges permanently */

1898

ret = setuid(uid);

1899

if(ret == -1){

1900

perror_plus("setuid");

1901

}

1902

}

2325

bool interface_was_up = interface_is_up(interface);

2326

errno = bring_up_interface(interface, delay);

2327

if(not interface_was_up){

2328

if(errno != 0){

2329

perror_plus("Failed to bring up interface");

2330

} else {

2331

errno = argz_add(&interfaces_to_take_down,

2332

&interfaces_to_take_down_size,

2333

interface);

2334

if(errno != 0){

2335

perror_plus("argz_add");

2336

}

2337

}

2338

}

2339

}

2340

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

2341

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

2342

}

2343

}

2344

2345

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

2346

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

2347

if(debug){

2348

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

2349

mc.interfaces);

2350

}

2351

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

1903

2352

}

1904

2353

1905

2354

if(quit_now){

1906

2355

goto end;

1907

2356

}

1908

2357

1909

ret = init_gnutls_global(pubkey, seckey);

2358

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

1910

2359

if(ret == -1){

1911

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

2360

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

1912

2361

exitcode = EX_UNAVAILABLE;

1913

2362

goto end;

1914

2363

} else {

1919

2368

goto end;

1920

2369

}

1921

2370

1922

if(mkdtemp(tempdir) == NULL){

2371

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

2372

tempdir = mkdtemp(run_tempdir);

2373

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

2374

if(debug){

2375

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

2376

run_tempdir, old_tempdir);

2377

}

2378

tempdir = mkdtemp(old_tempdir);

2379

}

2380

if(tempdir == NULL){

1923

2381

perror_plus("mkdtemp");

1924

2382

goto end;

1925

2383

}

1926

tempdir_created = true;

1927

2384

1928

2385

if(quit_now){

1929

2386

goto end;

1930

2387

}

1931

2388

1932

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

1933

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

2389

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

2390

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

1934

2391

exitcode = EX_UNAVAILABLE;

1935

2392

goto end;

1936

2393

} else {

1945

2402

/* Connect directly, do not use Zeroconf */

1946

2403

/* (Mainly meant for debugging) */

1947

2404

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

2405

1948

2406

if(address == NULL){

1949

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

2407

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

1950

2408

exitcode = EX_USAGE;

1951

2409

goto end;

1952

2410

}

1955

2413

goto end;

1956

2414

}

1957

2415

1958

uint16_t port;

2416

in_port_t port;

1959

2417

errno = 0;

1960

2418

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

1961

2419

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

1962

or tmpmax != (uint16_t)tmpmax){

1963

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

2420

or tmpmax != (in_port_t)tmpmax){

2421

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

1964

2422

exitcode = EX_USAGE;

1965

2423

goto end;

1966

2424

}

1967

2425

1968

2426

if(quit_now){

1969

2427

goto end;

1970

2428

}

1971

2429

1972

port = (uint16_t)tmpmax;

2430

port = (in_port_t)tmpmax;

1973

2431

*address = '\0';

1974

2432

/* Colon in address indicates IPv6 */

1975

2433

int af;

1991

2449

}

1992

2450

1993

2451

while(not quit_now){

1994

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

2452

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

2453

&mc);

1995

2454

if(quit_now or ret == 0){

1996

2455

break;

1997

2456

}

1998

2457

if(debug){

1999

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

2000

(int)retry_interval);

2458

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

2459

(int)retry_interval);

2001

2460

}

2002

sleep((int)retry_interval);

2461

sleep((unsigned int)retry_interval);

2003

2462

}

2004

2463

2005

if (not quit_now){

2464

if(not quit_now){

2006

2465

exitcode = EXIT_SUCCESS;

2007

2466

}

2008

2467

2023

2482

config.publish_domain = 0;

2024

2483

2025

2484

/* Allocate a new server */

2026

mc.server = avahi_server_new(avahi_simple_poll_get

2027

(mc.simple_poll), &config, NULL,

2028

NULL, &error);

2485

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2486

&config, NULL, NULL, &ret_errno);

2029

2487

2030

2488

/* Free the Avahi configuration data */

2031

2489

avahi_server_config_free(&config);

2033

2491

2034

2492

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

2035

2493

if(mc.server == NULL){

2036

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

2037

avahi_strerror(error));

2494

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

2495

avahi_strerror(ret_errno));

2038

2496

exitcode = EX_UNAVAILABLE;

2039

2497

goto end;

2040

2498

}

2046

2504

/* Create the Avahi service browser */

2047

2505

sb = avahi_s_service_browser_new(mc.server, if_index,

2048

2506

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2049

NULL, 0, browse_callback, NULL);

2507

NULL, 0, browse_callback,

2508

(void *)&mc);

2050

2509

if(sb == NULL){

2051

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

2052

avahi_strerror(avahi_server_errno(mc.server)));

2510

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

2511

avahi_strerror(avahi_server_errno(mc.server)));

2053

2512

exitcode = EX_UNAVAILABLE;

2054

2513

goto end;

2055

2514

}

2061

2520

/* Run the main loop */

2062

2521

2063

2522

if(debug){

2064

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

2523

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

2065

2524

}

2066

2067

ret = avahi_loop_with_timeout(mc.simple_poll,

2068

(int)(retry_interval * 1000));

2525

2526

ret = avahi_loop_with_timeout(simple_poll,

2527

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

2069

2528

if(debug){

2070

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

2071

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

2529

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

2530

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

2072

2531

}

2073

2532

2074

2533

end:

2075

2534

2076

2535

if(debug){

2077

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

2536

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

2078

2537

}

2079

2538

2080

2539

/* Cleanup things */

2540

free(mc.interfaces);

2541

2081

2542

if(sb != NULL)

2082

2543

avahi_s_service_browser_free(sb);

2083

2544

2084

2545

if(mc.server != NULL)

2085

2546

avahi_server_free(mc.server);

2086

2547

2087

if(mc.simple_poll != NULL)

2088

avahi_simple_poll_free(mc.simple_poll);

2548

if(simple_poll != NULL)

2549

avahi_simple_poll_free(simple_poll);

2089

2550

2090

2551

if(gnutls_initialized){

2091

2552

gnutls_certificate_free_credentials(mc.cred);

2096

2557

if(gpgme_initialized){

2097

2558

gpgme_release(mc.ctx);

2098

2559

}

2099

2560

2100

2561

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

2101

2562

has seen */

2102

2563

if(mc.current_server != NULL){

2103

2564

mc.current_server->prev->next = NULL;

2104

2565

while(mc.current_server != NULL){

2105

2566

server *next = mc.current_server->next;

2567

#ifdef __GNUC__

2568

#pragma GCC diagnostic push

2569

#pragma GCC diagnostic ignored "-Wcast-qual"

2570

#endif

2571

free((char *)(mc.current_server->ip));

2572

#ifdef __GNUC__

2573

#pragma GCC diagnostic pop

2574

#endif

2106

2575

free(mc.current_server);

2107

2576

mc.current_server = next;

2108

2577

}

2109

2578

}

2110

2579

2111

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

2112

2113

/* Take down the network interface */

2114

if(take_down_interface){

2115

/* Re-raise priviliges */

2116

errno = 0;

2117

ret = seteuid(0);

2118

if(ret == -1){

2119

perror_plus("seteuid");

2580

/* Re-raise privileges */

2581

{

2582

ret_errno = raise_privileges();

2583

if(ret_errno != 0){

2584

errno = ret_errno;

2585

perror_plus("Failed to raise privileges");

2586

} else {

2587

2588

/* Run network hooks */

2589

run_network_hooks("stop", interfaces_hooks != NULL ?

2590

interfaces_hooks : "", delay);

2591

2592

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

2593

{

2594

char *interface = NULL;

2595

while((interface=argz_next(interfaces_to_take_down,

2596

interfaces_to_take_down_size,

2597

interface))){

2598

ret_errno = take_down_interface(interface);

2599

if(ret_errno != 0){

2600

errno = ret_errno;

2601

perror_plus("Failed to take down interface");

2602

}

2603

}

2604

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

2605

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

2606

" down\n");

2607

}

2608

}

2120

2609

}

2121

if(geteuid() == 0){

2122

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

2123

if(ret == -1){

2124

perror_plus("ioctl SIOCGIFFLAGS");

2125

} else if(network.ifr_flags & IFF_UP) {

2126

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

2127

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

2128

if(ret == -1){

2129

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2130

}

2131

}

2132

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

2133

if(ret == -1){

2134

perror_plus("close");

2135

}

2136

/* Lower privileges permanently */

2137

errno = 0;

2138

ret = setuid(uid);

2139

if(ret == -1){

2140

perror_plus("setuid");

2141

}

2610

2611

ret_errno = lower_privileges_permanently();

2612

if(ret_errno != 0){

2613

errno = ret_errno;

2614

perror_plus("Failed to lower privileges permanently");

2142

2615

}

2143

2616

}

2144

2617

2618

free(interfaces_to_take_down);

2619

free(interfaces_hooks);

2620

2145

2621

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

2146

if(tempdir_created){

2622

if(tempdir != NULL){

2147

2623

struct dirent **direntries = NULL;

2148

struct dirent *direntry = NULL;

2149

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

2150

alphasort);

2151

if (numentries > 0){

2152

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

2153

direntry = direntries[i];

2154

char *fullname = NULL;

2155

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

2156

direntry->d_name);

2157

if(ret < 0){

2158

perror_plus("asprintf");

2159

continue;

2160

}

2161

ret = remove(fullname);

2162

if(ret == -1){

2163

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

2164

strerror(errno));

2165

}

2166

free(fullname);

2624

int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |

2625

O_NOFOLLOW));

2626

if(tempdir_fd == -1){

2627

perror_plus("open");

2628

} else {

2629

#ifdef __GLIBC__

2630

#if __GLIBC_PREREQ(2, 15)

2631

int numentries = scandirat(tempdir_fd, ".", &direntries,

2632

notdotentries, alphasort);

2633

#else /* not __GLIBC_PREREQ(2, 15) */

2634

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

2635

alphasort);

2636

#endif /* not __GLIBC_PREREQ(2, 15) */

2637

#else /* not __GLIBC__ */

2638

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

2639

alphasort);

2640

#endif /* not __GLIBC__ */

2641

if(numentries >= 0){

2642

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

2643

ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);

2644

if(ret == -1){

2645

fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"

2646

" \"%s\", 0): %s\n", tempdir,

2647

direntries[i]->d_name, strerror(errno));

2648

}

2649

free(direntries[i]);

2650

}

2651

2652

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

2653

free(direntries);

2654

if(numentries == -1){

2655

perror_plus("scandir");

2656

}

2657

ret = rmdir(tempdir);

2658

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

2659

perror_plus("rmdir");

2660

}

2167

2661

}

2168

}

2169

2170

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

2171

free(direntries);

2172

if (numentries == -1){

2173

perror_plus("scandir");

2174

}

2175

ret = rmdir(tempdir);

2176

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

2177

perror_plus("rmdir");

2662

TEMP_FAILURE_RETRY(close(tempdir_fd));

2178

2663

}

2179

2664

}

2180

2665