/mandos/release : revision 237.2.132

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

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*

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* Everything else is

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*

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

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

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* along with this program. If not, see

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* <http://www.gnu.org/licenses/>.

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*

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* Contact the authors at <mandos@recompile.se>.

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* Contact the authors at <mandos@fukt.bsnet.se>.

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*/

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

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

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stdout, ferror(), remove() */

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

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

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

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

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strtof(), abort() */

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

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srand(), strtof() */

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#include <stdbool.h> /* bool, false, true */

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#include <string.h> /* memset(), strcmp(), strlen(),

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strerror(), asprintf(), strcpy() */

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sockaddr_in6, PF_INET6,

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SOCK_STREAM, uid_t, gid_t, open(),

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opendir(), DIR */

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

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

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

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strtoimax() */

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

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

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program_invocation_short_name */

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

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

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

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#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,

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SIOCSIFFLAGS, if_indextoname(),

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if_nametoindex(), IF_NAMESIZE */

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*/

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

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

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

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

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setgid() */

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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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#include <signal.h> /* sigemptyset(), sigaddset(),

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sigaction(), SIGTERM, sig_atomic_t,

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84

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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85

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#ifdef __linux__

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

111

105

init_gnutls_session(),

112

106

GNUTLS_* */

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107

#include <gnutls/openpgp.h>

114

/* 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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117

111

/* GPGME */

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112

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

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120

#define PATHDIR "/conf/conf.d/mandos"

127

121

#define SECKEY "seckey.txt"

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122

#define PUBKEY "pubkey.txt"

129

#define HOOKDIR "/lib/mandos/network-hooks.d"

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123

131

124

bool debug = false;

132

125

static const char mandos_protocol_version[] = "1";

133

126

const char *argp_program_version = "mandos-client " VERSION;

134

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

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

136

char *connect_to = NULL;

137

const char *hookdir = HOOKDIR;

138

139

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

140

typedef struct server{

141

const char *ip;

142

uint16_t port;

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AvahiIfIndex if_index;

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int af;

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struct timespec last_seen;

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struct server *next;

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struct server *prev;

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} server;

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

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

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typedef struct {

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135

gnutls_dh_params_t dh_params;

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136

const char *priority;

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137

gpgme_ctx_t ctx;

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server *current_server;

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138

} mandos_context;

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139

162

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

163

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

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142

.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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168

sig_atomic_t quit_now = 0;

169

int signal_received = 0;

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171

/* Function to use when printing errors */

172

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;

177

perror(print_text);

178

}

179

180

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

181

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

182

va_list ap;

183

va_start (ap, format);

184

185

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

186

program_invocation_short_name));

187

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

188

}

143

":!CTYPE-X.509:+CTYPE-OPENPGP" };

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144

190

145

/*

191

146

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

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148

* "buffer_length" is how much is already used.

194

149

*/

195

150

size_t incbuffer(char **buffer, size_t buffer_length,

196

size_t buffer_capacity){

151

size_t buffer_capacity){

197

152

if(buffer_length + BUFFER_SIZE > buffer_capacity){

198

153

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

199

154

if(buffer == NULL){

204

159

return buffer_capacity;

205

160

}

206

161

207

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

208

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

209

int af){

210

int ret;

211

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

212

if(new_server == NULL){

213

perror_plus("malloc");

214

return false;

215

}

216

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

217

.port = port,

218

.if_index = if_index,

219

.af = af };

220

if(new_server->ip == NULL){

221

perror_plus("strdup");

222

return false;

223

}

224

/* Special case of first server */

225

if (mc.current_server == NULL){

226

new_server->next = new_server;

227

new_server->prev = new_server;

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mc.current_server = new_server;

229

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

230

} else {

231

new_server->next = mc.current_server;

232

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

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new_server->prev->next = new_server;

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mc.current_server->prev = new_server;

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}

236

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

237

if(ret == -1){

238

perror_plus("clock_gettime");

239

return false;

240

}

241

return true;

242

}

243

244

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/*

245

163

* Initialize GPGME.

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164

*/

247

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

248

const char *tempdir){

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static bool init_gpgme(const char *seckey,

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const char *pubkey, const char *tempdir){

249

167

gpgme_error_t rc;

250

168

gpgme_engine_info_t engine_info;

251

169

260

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261

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fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));

262

180

if(fd == -1){

263

perror_plus("open");

181

perror("open");

264

182

return false;

265

183

}

266

184

267

185

rc = gpgme_data_new_from_fd(&pgp_data, fd);

268

186

if(rc != GPG_ERR_NO_ERROR){

269

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

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gpgme_strsource(rc), gpgme_strerror(rc));

187

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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189

return false;

272

190

}

273

191

274

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rc = gpgme_op_import(mc.ctx, pgp_data);

275

193

if(rc != GPG_ERR_NO_ERROR){

276

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

277

gpgme_strsource(rc), gpgme_strerror(rc));

194

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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196

return false;

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197

}

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198

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

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200

if(ret == -1){

283

perror_plus("close");

201

perror("close");

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202

}

285

203

gpgme_data_release(pgp_data);

286

204

return true;

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205

}

288

206

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if(debug){

290

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

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

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209

}

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/* Init GPGME */

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gpgme_check_version(NULL);

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rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

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if(rc != GPG_ERR_NO_ERROR){

297

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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217

return false;

300

218

}

301

219

302

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

220

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

303

221

rc = gpgme_get_engine_info(&engine_info);

304

222

if(rc != GPG_ERR_NO_ERROR){

305

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

306

gpgme_strsource(rc), gpgme_strerror(rc));

223

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

224

gpgme_strsource(rc), gpgme_strerror(rc));

307

225

return false;

308

226

}

309

227

while(engine_info != NULL){

315

233

engine_info = engine_info->next;

316

234

}

317

235

if(engine_info == NULL){

318

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

319

tempdir);

236

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

320

237

return false;

321

238

}

322

239

323

240

/* Create new GPGME "context" */

324

241

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

325

242

if(rc != GPG_ERR_NO_ERROR){

326

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

327

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

328

gpgme_strerror(rc));

243

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

244

gpgme_strsource(rc), gpgme_strerror(rc));

329

245

return false;

330

246

}

331

247

350

266

ssize_t plaintext_length = 0;

351

267

352

268

if(debug){

353

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

269

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

354

270

}

355

271

356

272

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

357

273

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

358

274

0);

359

275

if(rc != GPG_ERR_NO_ERROR){

360

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

361

gpgme_strsource(rc), gpgme_strerror(rc));

276

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

277

gpgme_strsource(rc), gpgme_strerror(rc));

362

278

return -1;

363

279

}

364

280

365

281

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

366

282

rc = gpgme_data_new(&dh_plain);

367

283

if(rc != GPG_ERR_NO_ERROR){

368

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

369

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

370

gpgme_strsource(rc), gpgme_strerror(rc));

284

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

285

gpgme_strsource(rc), gpgme_strerror(rc));

371

286

gpgme_data_release(dh_crypto);

372

287

return -1;

373

288

}

376

291

data buffer */

377

292

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

378

293

if(rc != GPG_ERR_NO_ERROR){

379

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

380

gpgme_strsource(rc), gpgme_strerror(rc));

294

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

295

gpgme_strsource(rc), gpgme_strerror(rc));

381

296

plaintext_length = -1;

382

297

if(debug){

383

298

gpgme_decrypt_result_t result;

384

299

result = gpgme_op_decrypt_result(mc.ctx);

385

300

if(result == NULL){

386

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

301

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

387

302

} else {

388

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

389

result->unsupported_algorithm);

390

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

391

result->wrong_key_usage);

303

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

304

result->unsupported_algorithm);

305

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

306

result->wrong_key_usage);

392

307

if(result->file_name != NULL){

393

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

308

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

394

309

}

395

310

gpgme_recipient_t recipient;

396

311

recipient = result->recipients;

397

312

while(recipient != NULL){

398

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

399

gpgme_pubkey_algo_name

400

(recipient->pubkey_algo));

401

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

402

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

403

recipient->status == GPG_ERR_NO_SECKEY

404

? "No" : "Yes");

313

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

314

gpgme_pubkey_algo_name(recipient->pubkey_algo));

315

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

316

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

317

recipient->status == GPG_ERR_NO_SECKEY

318

? "No" : "Yes");

405

319

recipient = recipient->next;

406

320

}

407

321

}

410

324

}

411

325

412

326

if(debug){

413

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

327

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

414

328

}

415

329

416

330

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

417

331

if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){

418

perror_plus("gpgme_data_seek");

332

perror("gpgme_data_seek");

419

333

plaintext_length = -1;

420

334

goto decrypt_end;

421

335

}

423

337

*plaintext = NULL;

424

338

while(true){

425

339

plaintext_capacity = incbuffer(plaintext,

426

(size_t)plaintext_length,

427

plaintext_capacity);

340

(size_t)plaintext_length,

341

plaintext_capacity);

428

342

if(plaintext_capacity == 0){

429

perror_plus("incbuffer");

430

plaintext_length = -1;

431

goto decrypt_end;

343

perror("incbuffer");

344

plaintext_length = -1;

345

goto decrypt_end;

432

346

}

433

347

434

348

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

439

353

break;

440

354

}

441

355

if(ret < 0){

442

perror_plus("gpgme_data_read");

356

perror("gpgme_data_read");

443

357

plaintext_length = -1;

444

358

goto decrypt_end;

445

359

}

447

361

}

448

362

449

363

if(debug){

450

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

364

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

451

365

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

452

366

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

453

367

}

475

389

/* GnuTLS log function callback */

476

390

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

477

391

const char* string){

478

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

392

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

479

393

}

480

394

481

395

static int init_gnutls_global(const char *pubkeyfilename,

483

397

int ret;

484

398

485

399

if(debug){

486

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

400

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

487

401

}

488

402

489

403

ret = gnutls_global_init();

490

404

if(ret != GNUTLS_E_SUCCESS){

491

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

492

safer_gnutls_strerror(ret));

405

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

406

safer_gnutls_strerror(ret));

493

407

return -1;

494

408

}

495

409

502

416

}

503

417

504

418

/* OpenPGP credentials */

505

ret = gnutls_certificate_allocate_credentials(&mc.cred);

419

gnutls_certificate_allocate_credentials(&mc.cred);

506

420

if(ret != GNUTLS_E_SUCCESS){

507

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

508

safer_gnutls_strerror(ret));

421

fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning

422

from

423

-Wunreachable-code

424

*/

425

safer_gnutls_strerror(ret));

509

426

gnutls_global_deinit();

510

427

return -1;

511

428

}

512

429

513

430

if(debug){

514

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

515

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

516

pubkeyfilename,

517

seckeyfilename);

431

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

432

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

433

seckeyfilename);

518

434

}

519

435

520

436

ret = gnutls_certificate_set_openpgp_key_file

521

437

(mc.cred, pubkeyfilename, seckeyfilename,

522

438

GNUTLS_OPENPGP_FMT_BASE64);

523

439

if(ret != GNUTLS_E_SUCCESS){

524

fprintf_plus(stderr,

525

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

526

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

527

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

528

safer_gnutls_strerror(ret));

440

fprintf(stderr,

441

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

442

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

443

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

444

safer_gnutls_strerror(ret));

529

445

goto globalfail;

530

446

}

531

447

532

448

/* GnuTLS server initialization */

533

449

ret = gnutls_dh_params_init(&mc.dh_params);

534

450

if(ret != GNUTLS_E_SUCCESS){

535

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

536

" initialization: %s\n",

537

safer_gnutls_strerror(ret));

451

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

452

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

538

453

goto globalfail;

539

454

}

540

455

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

541

456

if(ret != GNUTLS_E_SUCCESS){

542

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

543

safer_gnutls_strerror(ret));

457

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

458

safer_gnutls_strerror(ret));

544

459

goto globalfail;

545

460

}

546

461

561

476

/* GnuTLS session creation */

562

477

do {

563

478

ret = gnutls_init(session, GNUTLS_SERVER);

564

if(quit_now){

565

return -1;

566

}

567

479

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

568

480

if(ret != GNUTLS_E_SUCCESS){

569

fprintf_plus(stderr,

570

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

571

safer_gnutls_strerror(ret));

481

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

482

safer_gnutls_strerror(ret));

572

483

}

573

484

574

485

{

575

486

const char *err;

576

487

do {

577

488

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

578

if(quit_now){

579

gnutls_deinit(*session);

580

return -1;

581

}

582

489

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

583

490

if(ret != GNUTLS_E_SUCCESS){

584

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

585

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

586

safer_gnutls_strerror(ret));

491

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

492

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

493

safer_gnutls_strerror(ret));

587

494

gnutls_deinit(*session);

588

495

return -1;

589

496

}

592

499

do {

593

500

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

594

501

mc.cred);

595

if(quit_now){

596

gnutls_deinit(*session);

597

return -1;

598

}

599

502

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

600

503

if(ret != GNUTLS_E_SUCCESS){

601

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

602

safer_gnutls_strerror(ret));

504

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

505

safer_gnutls_strerror(ret));

603

506

gnutls_deinit(*session);

604

507

return -1;

605

508

}

616

519

static void empty_log(__attribute__((unused)) AvahiLogLevel level,

617

520

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

618

521

522

sig_atomic_t quit_now = 0;

523

int signal_received = 0;

524

619

525

/* Called when a Mandos server is found */

620

526

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

621

527

AvahiIfIndex if_index,

627

533

struct sockaddr_in6 in6;

628

534

} to;

629

535

char *buffer = NULL;

630

char *decrypted_buffer = NULL;

536

char *decrypted_buffer;

631

537

size_t buffer_length = 0;

632

538

size_t buffer_capacity = 0;

633

539

size_t written;

634

int retval = -1;

540

int retval = 0;

635

541

gnutls_session_t session;

636

542

int pf; /* Protocol family */

637

543

638

errno = 0;

639

640

544

if(quit_now){

641

errno = EINTR;

642

545

return -1;

643

546

}

644

547

650

553

pf = PF_INET;

651

554

break;

652

555

default:

653

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

654

errno = EINVAL;

556

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

655

557

return -1;

656

558

}

657

559

661

563

}

662

564

663

565

if(debug){

664

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

665

PRIu16 "\n", ip, port);

566

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

567

"\n", ip, port);

666

568

}

667

569

668

570

tcp_sd = socket(pf, SOCK_STREAM, 0);

669

571

if(tcp_sd < 0){

670

int e = errno;

671

perror_plus("socket");

672

errno = e;

572

perror("socket");

573

retval = -1;

673

574

goto mandos_end;

674

575

}

675

576

676

577

if(quit_now){

677

errno = EINTR;

678

578

goto mandos_end;

679

579

}

680

580

687

587

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

688

588

}

689

589

if(ret < 0 ){

690

int e = errno;

691

perror_plus("inet_pton");

692

errno = e;

590

perror("inet_pton");

591

retval = -1;

693

592

goto mandos_end;

694

593

}

695

594

if(ret == 0){

696

int e = errno;

697

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

698

errno = e;

595

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

596

retval = -1;

699

597

goto mandos_end;

700

598

}

701

599

if(af == AF_INET6){

705

603

706

604

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

707

605

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

708

-Wunreachable-code*/

606

-Wunreachable-code*/

709

607

if(if_index == AVAHI_IF_UNSPEC){

710

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

711

" incomplete without a network interface\n");

712

errno = EINVAL;

608

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

609

" without a network interface\n");

610

retval = -1;

713

611

goto mandos_end;

714

612

}

715

613

/* Set the network interface number as scope */

722

620

}

723

621

724

622

if(quit_now){

725

errno = EINTR;

726

623

goto mandos_end;

727

624

}

728

625

730

627

if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){

731

628

char interface[IF_NAMESIZE];

732

629

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

733

perror_plus("if_indextoname");

630

perror("if_indextoname");

734

631

} else {

735

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

736

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

632

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

633

ip, interface, port);

737

634

}

738

635

} else {

739

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

740

ip, port);

636

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

637

port);

741

638

}

742

639

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

743

640

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

750

647

sizeof(addrstr));

751

648

}

752

649

if(pcret == NULL){

753

perror_plus("inet_ntop");

650

perror("inet_ntop");

754

651

} else {

755

652

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

756

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

653

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

757

654

}

758

655

}

759

656

}

760

657

761

658

if(quit_now){

762

errno = EINTR;

763

659

goto mandos_end;

764

660

}

765

661

769

665

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

770

666

}

771

667

if(ret < 0){

772

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

773

int e = errno;

774

perror_plus("connect");

775

errno = e;

776

}

668

perror("connect");

669

retval = -1;

777

670

goto mandos_end;

778

671

}

779

672

780

673

if(quit_now){

781

errno = EINTR;

782

674

goto mandos_end;

783

675

}

784

676

787

679

while(true){

788

680

size_t out_size = strlen(out);

789

681

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

790

out_size - written));

682

out_size - written));

791

683

if(ret == -1){

792

int e = errno;

793

perror_plus("write");

794

errno = e;

684

perror("write");

685

retval = -1;

795

686

goto mandos_end;

796

687

}

797

688

written += (size_t)ret;

807

698

}

808

699

809

700

if(quit_now){

810

errno = EINTR;

811

701

goto mandos_end;

812

702

}

813

703

}

814

704

815

705

if(debug){

816

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

706

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

817

707

}

818

708

819

709

if(quit_now){

820

errno = EINTR;

821

710

goto mandos_end;

822

711

}

823

712

824

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

825

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

826

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

827

gnutls_transport_set_ptr(session,

828

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

713

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

829

714

830

715

if(quit_now){

831

errno = EINTR;

832

716

goto mandos_end;

833

717

}

834

718

835

719

do {

836

720

ret = gnutls_handshake(session);

837

721

if(quit_now){

838

errno = EINTR;

839

722

goto mandos_end;

840

723

}

841

724

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

842

725

843

726

if(ret != GNUTLS_E_SUCCESS){

844

727

if(debug){

845

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

728

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

846

729

gnutls_perror(ret);

847

730

}

848

errno = EPROTO;

731

retval = -1;

849

732

goto mandos_end;

850

733

}

851

734

852

735

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

853

736

854

737

if(debug){

855

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

856

" %s\n", ip);

738

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

739

ip);

857

740

}

858

741

859

742

while(true){

860

743

861

744

if(quit_now){

862

errno = EINTR;

863

745

goto mandos_end;

864

746

}

865

747

866

748

buffer_capacity = incbuffer(&buffer, buffer_length,

867

buffer_capacity);

749

buffer_capacity);

868

750

if(buffer_capacity == 0){

869

int e = errno;

870

perror_plus("incbuffer");

871

errno = e;

751

perror("incbuffer");

752

retval = -1;

872

753

goto mandos_end;

873

754

}

874

755

875

756

if(quit_now){

876

errno = EINTR;

877

757

goto mandos_end;

878

758

}

879

759

892

772

ret = gnutls_handshake(session);

893

773

894

774

if(quit_now){

895

errno = EINTR;

896

775

goto mandos_end;

897

776

}

898

777

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

899

778

if(ret < 0){

900

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

901

"***\n");

779

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

902

780

gnutls_perror(ret);

903

errno = EPROTO;

781

retval = -1;

904

782

goto mandos_end;

905

783

}

906

784

break;

907

785

default:

908

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

909

" encrypted session with Mandos server\n");

786

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

787

" encrypted session with Mandos server\n");

788

retval = -1;

910

789

gnutls_bye(session, GNUTLS_SHUT_RDWR);

911

errno = EIO;

912

790

goto mandos_end;

913

791

}

914

792

} else {

917

795

}

918

796

919

797

if(debug){

920

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

921

}

922

923

if(quit_now){

924

errno = EINTR;

925

goto mandos_end;

926

}

927

928

do {

929

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

930

if(quit_now){

931

errno = EINTR;

932

goto mandos_end;

933

}

934

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

798

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

799

}

800

801

if(quit_now){

802

goto mandos_end;

803

}

804

805

gnutls_bye(session, GNUTLS_SHUT_RDWR);

806

807

if(quit_now){

808

goto mandos_end;

809

}

935

810

936

811

if(buffer_length > 0){

937

812

ssize_t decrypted_buffer_size;

938

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

813

decrypted_buffer_size = pgp_packet_decrypt(buffer,

814

buffer_length,

939

815

&decrypted_buffer);

940

816

if(decrypted_buffer_size >= 0){

941

817

942

818

written = 0;

943

819

while(written < (size_t) decrypted_buffer_size){

944

820

if(quit_now){

945

errno = EINTR;

946

821

goto mandos_end;

947

822

}

948

823

950

825

(size_t)decrypted_buffer_size - written,

951

826

stdout);

952

827

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

953

int e = errno;

954

828

if(debug){

955

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

956

strerror(errno));

829

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

830

strerror(errno));

957

831

}

958

errno = e;

959

goto mandos_end;

832

retval = -1;

833

break;

960

834

}

961

835

written += (size_t)ret;

962

836

}

963

retval = 0;

837

free(decrypted_buffer);

838

} else {

839

retval = -1;

964

840

}

841

} else {

842

retval = -1;

965

843

}

966

844

967

845

/* Shutdown procedure */

968

846

969

847

mandos_end:

970

{

971

int e = errno;

972

free(decrypted_buffer);

973

free(buffer);

974

if(tcp_sd >= 0){

975

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

976

}

977

if(ret == -1){

978

if(e == 0){

979

e = errno;

980

}

981

perror_plus("close");

982

}

983

gnutls_deinit(session);

984

errno = e;

985

if(quit_now){

986

errno = EINTR;

987

retval = -1;

988

}

848

free(buffer);

849

if(tcp_sd >= 0){

850

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

851

}

852

if(ret == -1){

853

perror("close");

854

}

855

gnutls_deinit(session);

856

if(quit_now){

857

retval = -1;

989

858

}

990

859

return retval;

991

860

}

1016

885

switch(event){

1017

886

default:

1018

887

case AVAHI_RESOLVER_FAILURE:

1019

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

1020

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

1021

domain,

1022

avahi_strerror(avahi_server_errno(mc.server)));

888

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

889

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

890

avahi_strerror(avahi_server_errno(mc.server)));

1023

891

break;

1024

892

1025

893

case AVAHI_RESOLVER_FOUND:

1027

895

char ip[AVAHI_ADDRESS_STR_MAX];

1028

896

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

1029

897

if(debug){

1030

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

1031

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

1032

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

898

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

899

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

900

ip, (intmax_t)interface, port);

1033

901

}

1034

902

int ret = start_mandos_communication(ip, port, interface,

1035

903

avahi_proto_to_af(proto));

1036

904

if(ret == 0){

1037

905

avahi_simple_poll_quit(mc.simple_poll);

1038

} else {

1039

if(not add_server(ip, port, interface,

1040

avahi_proto_to_af(proto))){

1041

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

1042

" list\n", name);

1043

}

1044

906

}

1045

907

}

1046

908

}

1070

932

default:

1071

933

case AVAHI_BROWSER_FAILURE:

1072

934

1073

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

1074

avahi_strerror(avahi_server_errno(mc.server)));

935

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

936

avahi_strerror(avahi_server_errno(mc.server)));

1075

937

avahi_simple_poll_quit(mc.simple_poll);

1076

938

return;

1077

939

1084

946

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

1085

947

name, type, domain, protocol, 0,

1086

948

resolve_callback, NULL) == NULL)

1087

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

1088

" %s\n", name,

1089

avahi_strerror(avahi_server_errno(mc.server)));

949

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

950

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

1090

951

break;

1091

952

1092

953

case AVAHI_BROWSER_REMOVE:

1095

956

case AVAHI_BROWSER_ALL_FOR_NOW:

1096

957

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1097

958

if(debug){

1098

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

1099

" searching...\n");

959

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

1100

960

}

1101

961

break;

1102

962

}

1103

963

}

1104

964

1105

/* Signal handler that stops main loop after SIGTERM */

965

/* stop main loop after sigterm has been called */

1106

966

static void handle_sigterm(int sig){

1107

967

if(quit_now){

1108

968

return;

1110

970

quit_now = 1;

1111

971

signal_received = sig;

1112

972

int old_errno = errno;

1113

/* set main loop to exit */

1114

973

if(mc.simple_poll != NULL){

1115

974

avahi_simple_poll_quit(mc.simple_poll);

1116

975

}

1117

976

errno = old_errno;

1118

977

}

1119

978

1120

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

1121

int ret;

1122

1123

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

1124

if(s < 0){

1125

perror_plus("socket");

1126

return false;

1127

}

1128

strcpy(ifr->ifr_name, ifname);

1129

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1130

if(ret == -1){

1131

if(debug){

1132

perror_plus("ioctl SIOCGIFFLAGS");

1133

}

1134

return false;

1135

}

1136

return true;

1137

}

1138

1139

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

1140

1141

/* Reject the loopback device */

1142

if(ifr->ifr_flags & IFF_LOOPBACK){

1143

if(debug){

1144

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

1145

ifname);

1146

}

1147

return false;

1148

}

1149

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

1150

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

1151

if(debug){

1152

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

1153

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

1154

}

1155

return true;

1156

}

1157

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

1158

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

1159

if(debug){

1160

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1161

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

1162

}

1163

return false;

1164

}

1165

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

1166

if(ifr->ifr_flags & IFF_NOARP){

1167

if(debug){

1168

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

1169

ifname);

1170

}

1171

return false;

1172

}

1173

1174

/* Accept this device */

1175

if(debug){

1176

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

1177

}

1178

return true;

1179

}

1180

1181

/*

1182

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

1183

* corresponds to an acceptable network device.

1184

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

1185

*/

1186

int good_interface(const struct dirent *if_entry){

1187

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

1188

return 0;

1189

}

1190

1191

struct ifreq ifr;

1192

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

1193

if(debug){

1194

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

1195

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

1196

}

1197

return 0;

1198

}

1199

1200

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

1201

return 0;

1202

}

1203

return 1;

1204

}

1205

1206

/*

1207

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

1208

* corresponds to an acceptable network device which is up.

1209

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

1210

*/

1211

int up_interface(const struct dirent *if_entry){

1212

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

1213

return 0;

1214

}

1215

1216

struct ifreq ifr;

1217

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

1218

if(debug){

1219

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

1220

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

1221

}

1222

return 0;

1223

}

1224

1225

/* Reject down interfaces */

1226

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

1227

if(debug){

1228

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

1229

if_entry->d_name);

1230

}

1231

return 0;

1232

}

1233

1234

/* Reject non-running interfaces */

1235

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

1236

if(debug){

1237

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

1238

if_entry->d_name);

1239

}

1240

return 0;

1241

}

1242

1243

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

1244

return 0;

1245

}

1246

return 1;

1247

}

1248

1249

int notdotentries(const struct dirent *direntry){

1250

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

1251

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

1252

and (direntry->d_name[1] == '\0'

1253

or (direntry->d_name[1] == '.'

1254

and direntry->d_name[2] == '\0'))){

1255

return 0;

1256

}

1257

return 1;

1258

}

1259

1260

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

1261

int runnable_hook(const struct dirent *direntry){

1262

int ret;

1263

size_t sret;

1264

struct stat st;

1265

1266

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

1267

/* Empty name? */

1268

return 0;

1269

}

1270

1271

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

1272

"abcdefghijklmnopqrstuvwxyz"

1273

"0123456789"

1274

"_-");

1275

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

1276

/* Contains non-allowed characters */

1277

if(debug){

1278

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

1279

direntry->d_name);

1280

}

1281

return 0;

1282

}

1283

1284

char *fullname = NULL;

1285

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

1286

if(ret < 0){

1287

perror_plus("asprintf");

1288

return 0;

1289

}

1290

1291

ret = stat(fullname, &st);

1292

if(ret == -1){

1293

if(debug){

1294

perror_plus("Could not stat hook");

1295

}

1296

return 0;

1297

}

1298

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

1299

/* Not a regular file */

1300

if(debug){

1301

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

1302

direntry->d_name);

1303

}

1304

return 0;

1305

}

1306

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

1307

/* Not executable */

1308

if(debug){

1309

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

1310

direntry->d_name);

1311

}

1312

return 0;

1313

}

1314

if(debug){

1315

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

1316

direntry->d_name);

1317

}

1318

return 1;

1319

}

1320

1321

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1322

int ret;

1323

struct timespec now;

1324

struct timespec waited_time;

1325

intmax_t block_time;

1326

1327

while(true){

1328

if(mc.current_server == NULL){

1329

if (debug){

1330

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

1331

" No timeout!\n");

1332

}

1333

ret = avahi_simple_poll_iterate(s, -1);

1334

} else {

1335

if (debug){

1336

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

1337

" it, or wait\n");

1338

}

1339

/* the current time */

1340

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1341

if(ret == -1){

1342

perror_plus("clock_gettime");

1343

return -1;

1344

}

1345

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

1346

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

1347

waited_time.tv_sec = (now.tv_sec

1348

- mc.current_server->last_seen.tv_sec);

1349

waited_time.tv_nsec = (now.tv_nsec

1350

- mc.current_server->last_seen.tv_nsec);

1351

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

1352

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

1353

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

1354

block_time = ((retry_interval

1355

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

1356

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

1357

1358

if (debug){

1359

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

1360

block_time);

1361

}

1362

1363

if(block_time <= 0){

1364

ret = start_mandos_communication(mc.current_server->ip,

1365

mc.current_server->port,

1366

mc.current_server->if_index,

1367

mc.current_server->af);

1368

if(ret == 0){

1369

avahi_simple_poll_quit(mc.simple_poll);

1370

return 0;

1371

}

1372

ret = clock_gettime(CLOCK_MONOTONIC,

1373

&mc.current_server->last_seen);

1374

if(ret == -1){

1375

perror_plus("clock_gettime");

1376

return -1;

1377

}

1378

mc.current_server = mc.current_server->next;

1379

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

1380

servers, but don't block */

1381

}

1382

1383

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

1384

}

1385

if(ret != 0){

1386

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

1387

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

1388

}

1389

}

1390

}

1391

}

1392

1393

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

1394

const float delay){

1395

struct dirent **direntries;

1396

struct dirent *direntry;

1397

int ret;

1398

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

1399

alphasort);

1400

if(numhooks == -1){

1401

perror_plus("scandir");

1402

} else {

1403

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

1404

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

1405

direntry = direntries[i];

1406

char *fullname = NULL;

1407

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

1408

if(ret < 0){

1409

perror_plus("asprintf");

1410

continue;

1411

}

1412

if(debug){

1413

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

1414

direntry->d_name);

1415

}

1416

pid_t hook_pid = fork();

1417

if(hook_pid == 0){

1418

/* Child */

1419

/* Raise privileges */

1420

errno = 0;

1421

ret = seteuid(0);

1422

if(ret == -1){

1423

perror_plus("seteuid");

1424

}

1425

/* Raise privileges even more */

1426

errno = 0;

1427

ret = setuid(0);

1428

if(ret == -1){

1429

perror_plus("setuid");

1430

}

1431

/* Set group */

1432

errno = 0;

1433

ret = setgid(0);

1434

if(ret == -1){

1435

perror_plus("setgid");

1436

}

1437

/* Reset supplementary groups */

1438

errno = 0;

1439

ret = setgroups(0, NULL);

1440

if(ret == -1){

1441

perror_plus("setgroups");

1442

}

1443

dup2(devnull, STDIN_FILENO);

1444

close(devnull);

1445

dup2(STDERR_FILENO, STDOUT_FILENO);

1446

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

1447

if(ret == -1){

1448

perror_plus("setenv");

1449

_exit(EX_OSERR);

1450

}

1451

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

1452

if(ret == -1){

1453

perror_plus("setenv");

1454

_exit(EX_OSERR);

1455

}

1456

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

1457

if(ret == -1){

1458

perror_plus("setenv");

1459

_exit(EX_OSERR);

1460

}

1461

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

1462

if(ret == -1){

1463

perror_plus("setenv");

1464

_exit(EX_OSERR);

1465

}

1466

char *delaystring;

1467

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

1468

if(ret == -1){

1469

perror_plus("asprintf");

1470

_exit(EX_OSERR);

1471

}

1472

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

1473

if(ret == -1){

1474

free(delaystring);

1475

perror_plus("setenv");

1476

_exit(EX_OSERR);

1477

}

1478

free(delaystring);

1479

if(connect_to != NULL){

1480

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

1481

if(ret == -1){

1482

perror_plus("setenv");

1483

_exit(EX_OSERR);

1484

}

1485

}

1486

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

1487

perror_plus("execl");

1488

_exit(EXIT_FAILURE);

1489

}

1490

} else {

1491

int status;

1492

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

1493

perror_plus("waitpid");

1494

free(fullname);

1495

continue;

1496

}

1497

if(WIFEXITED(status)){

1498

if(WEXITSTATUS(status) != 0){

1499

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

1500

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

1501

WEXITSTATUS(status));

1502

free(fullname);

1503

continue;

1504

}

1505

} else if(WIFSIGNALED(status)){

1506

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

1507

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

1508

WTERMSIG(status));

1509

free(fullname);

1510

continue;

1511

} else {

1512

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

1513

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

1514

free(fullname);

1515

continue;

1516

}

1517

}

1518

free(fullname);

1519

if(debug){

1520

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

1521

direntry->d_name);

1522

}

1523

}

1524

close(devnull);

1525

}

1526

return true;

1527

}

1528

1529

979

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

1530

980

AvahiSServiceBrowser *sb = NULL;

1531

981

int error;

1533

983

intmax_t tmpmax;

1534

984

char *tmp;

1535

985

int exitcode = EXIT_SUCCESS;

1536

const char *interface = "";

986

const char *interface = "eth0";

1537

987

struct ifreq network;

1538

988

int sd = -1;

1539

989

bool take_down_interface = false;

1540

990

uid_t uid;

1541

991

gid_t gid;

992

char *connect_to = NULL;

1542

993

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

1543

994

bool tempdir_created = false;

1544

995

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1548

999

bool gnutls_initialized = false;

1549

1000

bool gpgme_initialized = false;

1550

1001

float delay = 2.5f;

1551

double retry_interval = 10; /* 10s between trying a server and

1552

retrying the same server again */

1553

1002

1554

1003

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1555

1004

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1561

1010

errno = 0;

1562

1011

ret = setgid(gid);

1563

1012

if(ret == -1){

1564

perror_plus("setgid");

1013

perror("setgid");

1565

1014

}

1566

1015

1567

1016

/* Lower user privileges (temporarily) */

1568

1017

errno = 0;

1569

1018

ret = seteuid(uid);

1570

1019

if(ret == -1){

1571

perror_plus("seteuid");

1020

perror("seteuid");

1572

1021

}

1573

1022

1574

1023

if(quit_now){

1609

1058

.arg = "SECONDS",

1610

1059

.doc = "Maximum delay to wait for interface startup",

1611

1060

.group = 2 },

1612

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

1613

.arg = "SECONDS",

1614

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

1615

.group = 2 },

1616

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

1617

.arg = "DIR",

1618

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

1619

.group = 2 },

1620

/*

1621

* These reproduce what we would get without ARGP_NO_HELP

1622

*/

1623

{ .name = "help", .key = '?',

1624

.doc = "Give this help list", .group = -1 },

1625

{ .name = "usage", .key = -3,

1626

.doc = "Give a short usage message", .group = -1 },

1627

{ .name = "version", .key = 'V',

1628

.doc = "Print program version", .group = -1 },

1629

1061

{ .name = NULL }

1630

1062

};

1631

1063

1632

1064

error_t parse_opt(int key, char *arg,

1633

1065

struct argp_state *state){

1634

errno = 0;

1635

1066

switch(key){

1636

1067

case 128: /* --debug */

1637

1068

debug = true;

1653

1084

tmpmax = strtoimax(arg, &tmp, 10);

1654

1085

if(errno != 0 or tmp == arg or *tmp != '\0'

1655

1086

or tmpmax != (typeof(mc.dh_bits))tmpmax){

1656

argp_error(state, "Bad number of DH bits");

1087

fprintf(stderr, "Bad number of DH bits\n");

1088

exit(EXIT_FAILURE);

1657

1089

}

1658

1090

mc.dh_bits = (typeof(mc.dh_bits))tmpmax;

1659

1091

break;

1664

1096

errno = 0;

1665

1097

delay = strtof(arg, &tmp);

1666

1098

if(errno != 0 or tmp == arg or *tmp != '\0'){

1667

argp_error(state, "Bad delay");

1668

}

1669

case 132: /* --retry */

1670

errno = 0;

1671

retry_interval = strtod(arg, &tmp);

1672

if(errno != 0 or tmp == arg or *tmp != '\0'

1673

or (retry_interval * 1000) > INT_MAX

1674

or retry_interval < 0){

1675

argp_error(state, "Bad retry interval");

1676

}

1677

break;

1678

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

1679

hookdir = arg;

1680

break;

1681

/*

1682

* These reproduce what we would get without ARGP_NO_HELP

1683

*/

1684

case '?': /* --help */

1685

argp_state_help(state, state->out_stream,

1686

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1687

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1688

case -3: /* --usage */

1689

argp_state_help(state, state->out_stream,

1690

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1691

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

1692

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

1693

exit(argp_err_exit_status);

1099

fprintf(stderr, "Bad delay\n");

1100

exit(EXIT_FAILURE);

1101

}

1102

break;

1103

case ARGP_KEY_ARG:

1104

argp_usage(state);

1105

case ARGP_KEY_END:

1694

1106

break;

1695

1107

default:

1696

1108

return ARGP_ERR_UNKNOWN;

1697

1109

}

1698

return errno;

1110

return 0;

1699

1111

}

1700

1112

1701

1113

struct argp argp = { .options = options, .parser = parse_opt,

1702

1114

.args_doc = "",

1703

1115

.doc = "Mandos client -- Get and decrypt"

1704

1116

" passwords from a Mandos server" };

1705

ret = argp_parse(&argp, argc, argv,

1706

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1707

switch(ret){

1708

case 0:

1709

break;

1710

case ENOMEM:

1711

default:

1712

errno = ret;

1713

perror_plus("argp_parse");

1714

exitcode = EX_OSERR;

1715

goto end;

1716

case EINVAL:

1717

exitcode = EX_USAGE;

1718

goto end;

1719

}

1720

}

1721

1722

{

1723

/* Work around Debian bug #633582:

1724

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

1725

1726

/* Re-raise priviliges */

1727

errno = 0;

1728

ret = seteuid(0);

1729

if(ret == -1){

1730

perror_plus("seteuid");

1731

} else {

1732

struct stat st;

1733

1734

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

1735

int seckey_fd = open(seckey, O_RDONLY);

1736

if(seckey_fd == -1){

1737

perror_plus("open");

1738

} else {

1739

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

1740

if(ret == -1){

1741

perror_plus("fstat");

1742

} else {

1743

if(S_ISREG(st.st_mode)

1744

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

1745

ret = fchown(seckey_fd, uid, gid);

1746

if(ret == -1){

1747

perror_plus("fchown");

1748

}

1749

}

1750

}

1751

TEMP_FAILURE_RETRY(close(seckey_fd));

1752

}

1753

}

1754

1755

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

1756

int pubkey_fd = open(pubkey, O_RDONLY);

1757

if(pubkey_fd == -1){

1758

perror_plus("open");

1759

} else {

1760

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

1761

if(ret == -1){

1762

perror_plus("fstat");

1763

} else {

1764

if(S_ISREG(st.st_mode)

1765

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

1766

ret = fchown(pubkey_fd, uid, gid);

1767

if(ret == -1){

1768

perror_plus("fchown");

1769

}

1770

}

1771

}

1772

TEMP_FAILURE_RETRY(close(pubkey_fd));

1773

}

1774

}

1775

1776

/* Lower privileges */

1777

errno = 0;

1778

ret = seteuid(uid);

1779

if(ret == -1){

1780

perror_plus("seteuid");

1781

}

1782

}

1783

}

1784

1785

/* Run network hooks */

1786

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

1787

goto end;

1117

ret = argp_parse(&argp, argc, argv, 0, 0, NULL);

1118

if(ret == ARGP_ERR_UNKNOWN){

1119

fprintf(stderr, "Unknown error while parsing arguments\n");

1120

exitcode = EXIT_FAILURE;

1121

goto end;

1122

}

1788

1123

}

1789

1124

1790

1125

if(not debug){

1791

1126

avahi_set_log_function(empty_log);

1792

1127

}

1793

1128

1794

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

1795

struct dirent **direntries;

1796

/* First look for interfaces that are up */

1797

ret = scandir(sys_class_net, &direntries, up_interface,

1798

alphasort);

1799

if(ret == 0){

1800

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

1801

free(direntries);

1802

ret = scandir(sys_class_net, &direntries, good_interface,

1803

alphasort);

1804

}

1805

if(ret >= 1){

1806

/* Pick the first interface returned */

1807

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

1808

if(debug){

1809

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

1810

}

1811

if(interface == NULL){

1812

perror_plus("malloc");

1813

free(direntries);

1814

exitcode = EXIT_FAILURE;

1815

goto end;

1816

}

1817

free(direntries);

1818

} else {

1819

free(direntries);

1820

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

1821

exitcode = EXIT_FAILURE;

1822

goto end;

1823

}

1824

}

1825

1826

1129

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

1827

1130

from the signal handler */

1828

1131

/* Initialize the pseudo-RNG for Avahi */

1829

1132

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

1830

1133

mc.simple_poll = avahi_simple_poll_new();

1831

1134

if(mc.simple_poll == NULL){

1832

fprintf_plus(stderr,

1833

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

1834

exitcode = EX_UNAVAILABLE;

1135

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

1136

exitcode = EXIT_FAILURE;

1835

1137

goto end;

1836

1138

}

1837

1139

1838

1140

sigemptyset(&sigterm_action.sa_mask);

1839

1141

ret = sigaddset(&sigterm_action.sa_mask, SIGINT);

1840

1142

if(ret == -1){

1841

perror_plus("sigaddset");

1842

exitcode = EX_OSERR;

1143

perror("sigaddset");

1144

exitcode = EXIT_FAILURE;

1843

1145

goto end;

1844

1146

}

1845

1147

ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);

1846

1148

if(ret == -1){

1847

perror_plus("sigaddset");

1848

exitcode = EX_OSERR;

1149

perror("sigaddset");

1150

exitcode = EXIT_FAILURE;

1849

1151

goto end;

1850

1152

}

1851

1153

ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);

1852

1154

if(ret == -1){

1853

perror_plus("sigaddset");

1854

exitcode = EX_OSERR;

1155

perror("sigaddset");

1156

exitcode = EXIT_FAILURE;

1855

1157

goto end;

1856

1158

}

1857

1159

/* Need to check if the handler is SIG_IGN before handling:

1860

1162

*/

1861

1163

ret = sigaction(SIGINT, NULL, &old_sigterm_action);

1862

1164

if(ret == -1){

1863

perror_plus("sigaction");

1864

return EX_OSERR;

1165

perror("sigaction");

1166

return EXIT_FAILURE;

1865

1167

}

1866

1168

if(old_sigterm_action.sa_handler != SIG_IGN){

1867

1169

ret = sigaction(SIGINT, &sigterm_action, NULL);

1868

1170

if(ret == -1){

1869

perror_plus("sigaction");

1870

exitcode = EX_OSERR;

1171

perror("sigaction");

1172

exitcode = EXIT_FAILURE;

1871

1173

goto end;

1872

1174

}

1873

1175

}

1874

1176

ret = sigaction(SIGHUP, NULL, &old_sigterm_action);

1875

1177

if(ret == -1){

1876

perror_plus("sigaction");

1877

return EX_OSERR;

1178

perror("sigaction");

1179

return EXIT_FAILURE;

1878

1180

}

1879

1181

if(old_sigterm_action.sa_handler != SIG_IGN){

1880

1182

ret = sigaction(SIGHUP, &sigterm_action, NULL);

1881

1183

if(ret == -1){

1882

perror_plus("sigaction");

1883

exitcode = EX_OSERR;

1184

perror("sigaction");

1185

exitcode = EXIT_FAILURE;

1884

1186

goto end;

1885

1187

}

1886

1188

}

1887

1189

ret = sigaction(SIGTERM, NULL, &old_sigterm_action);

1888

1190

if(ret == -1){

1889

perror_plus("sigaction");

1890

return EX_OSERR;

1191

perror("sigaction");

1192

return EXIT_FAILURE;

1891

1193

}

1892

1194

if(old_sigterm_action.sa_handler != SIG_IGN){

1893

1195

ret = sigaction(SIGTERM, &sigterm_action, NULL);

1894

1196

if(ret == -1){

1895

perror_plus("sigaction");

1896

exitcode = EX_OSERR;

1197

perror("sigaction");

1198

exitcode = EXIT_FAILURE;

1897

1199

goto end;

1898

1200

}

1899

1201

}

1900

1202

1901

1203

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

1902

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

1204

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

1903

1205

if_index = (AvahiIfIndex) if_nametoindex(interface);

1904

1206

if(if_index == 0){

1905

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

1906

exitcode = EX_UNAVAILABLE;

1207

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

1208

exitcode = EXIT_FAILURE;

1907

1209

goto end;

1908

1210

}

1909

1211

1915

1217

errno = 0;

1916

1218

ret = seteuid(0);

1917

1219

if(ret == -1){

1918

perror_plus("seteuid");

1220

perror("seteuid");

1919

1221

}

1920

1222

1921

1223

#ifdef __linux__

1922

1224

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1923

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

1225

messages to mess up the prompt */

1924

1226

ret = klogctl(8, NULL, 5);

1925

1227

bool restore_loglevel = true;

1926

1228

if(ret == -1){

1927

1229

restore_loglevel = false;

1928

perror_plus("klogctl");

1230

perror("klogctl");

1929

1231

}

1930

1232

#endif /* __linux__ */

1931

1233

1932

1234

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1933

1235

if(sd < 0){

1934

perror_plus("socket");

1935

exitcode = EX_OSERR;

1236

perror("socket");

1237

exitcode = EXIT_FAILURE;

1936

1238

#ifdef __linux__

1937

1239

if(restore_loglevel){

1938

1240

ret = klogctl(7, NULL, 0);

1939

1241

if(ret == -1){

1940

perror_plus("klogctl");

1242

perror("klogctl");

1941

1243

}

1942

1244

}

1943

1245

#endif /* __linux__ */

1945

1247

errno = 0;

1946

1248

ret = seteuid(uid);

1947

1249

if(ret == -1){

1948

perror_plus("seteuid");

1250

perror("seteuid");

1949

1251

}

1950

1252

goto end;

1951

1253

}

1952

1254

strcpy(network.ifr_name, interface);

1953

1255

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

1954

1256

if(ret == -1){

1955

perror_plus("ioctl SIOCGIFFLAGS");

1257

perror("ioctl SIOCGIFFLAGS");

1956

1258

#ifdef __linux__

1957

1259

if(restore_loglevel){

1958

1260

ret = klogctl(7, NULL, 0);

1959

1261

if(ret == -1){

1960

perror_plus("klogctl");

1262

perror("klogctl");

1961

1263

}

1962

1264

}

1963

1265

#endif /* __linux__ */

1964

exitcode = EX_OSERR;

1266

exitcode = EXIT_FAILURE;

1965

1267

/* Lower privileges */

1966

1268

errno = 0;

1967

1269

ret = seteuid(uid);

1968

1270

if(ret == -1){

1969

perror_plus("seteuid");

1271

perror("seteuid");

1970

1272

}

1971

1273

goto end;

1972

1274

}

1976

1278

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

1977

1279

if(ret == -1){

1978

1280

take_down_interface = false;

1979

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1980

exitcode = EX_OSERR;

1281

perror("ioctl SIOCSIFFLAGS");

1282

exitcode = EXIT_FAILURE;

1981

1283

#ifdef __linux__

1982

1284

if(restore_loglevel){

1983

1285

ret = klogctl(7, NULL, 0);

1984

1286

if(ret == -1){

1985

perror_plus("klogctl");

1287

perror("klogctl");

1986

1288

}

1987

1289

}

1988

1290

#endif /* __linux__ */

1990

1292

errno = 0;

1991

1293

ret = seteuid(uid);

1992

1294

if(ret == -1){

1993

perror_plus("seteuid");

1295

perror("seteuid");

1994

1296

}

1995

1297

goto end;

1996

1298

}

1997

1299

}

1998

/* Sleep checking until interface is running.

1999

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

1300

/* sleep checking until interface is running */

2000

1301

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

2001

1302

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

2002

1303

if(ret == -1){

2003

perror_plus("ioctl SIOCGIFFLAGS");

1304

perror("ioctl SIOCGIFFLAGS");

2004

1305

} else if(network.ifr_flags & IFF_RUNNING){

2005

1306

break;

2006

1307

}

2007

1308

struct timespec sleeptime = { .tv_nsec = 250000000 };

2008

1309

ret = nanosleep(&sleeptime, NULL);

2009

1310

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

2010

perror_plus("nanosleep");

1311

perror("nanosleep");

2011

1312

}

2012

1313

}

2013

1314

if(not take_down_interface){

2014

1315

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

2015

1316

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

2016

1317

if(ret == -1){

2017

perror_plus("close");

1318

perror("close");

2018

1319

}

2019

1320

}

2020

1321

#ifdef __linux__

2022

1323

/* Restores kernel loglevel to default */

2023

1324

ret = klogctl(7, NULL, 0);

2024

1325

if(ret == -1){

2025

perror_plus("klogctl");

1326

perror("klogctl");

2026

1327

}

2027

1328

}

2028

1329

#endif /* __linux__ */

2029

1330

/* Lower privileges */

2030

1331

errno = 0;

2031

/* Lower privileges */

2032

ret = seteuid(uid);

2033

if(ret == -1){

2034

perror_plus("seteuid");

1332

if(take_down_interface){

1333

/* Lower privileges */

1334

ret = seteuid(uid);

1335

if(ret == -1){

1336

perror("seteuid");

1337

}

1338

} else {

1339

/* Lower privileges permanently */

1340

ret = setuid(uid);

1341

if(ret == -1){

1342

perror("setuid");

1343

}

2035

1344

}

2036

1345

}

2037

1346

2041

1350

2042

1351

ret = init_gnutls_global(pubkey, seckey);

2043

1352

if(ret == -1){

2044

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

2045

exitcode = EX_UNAVAILABLE;

1353

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

1354

exitcode = EXIT_FAILURE;

2046

1355

goto end;

2047

1356

} else {

2048

1357

gnutls_initialized = true;

2052

1361

goto end;

2053

1362

}

2054

1363

1364

tempdir_created = true;

2055

1365

if(mkdtemp(tempdir) == NULL){

2056

perror_plus("mkdtemp");

1366

tempdir_created = false;

1367

perror("mkdtemp");

2057

1368

goto end;

2058

1369

}

2059

tempdir_created = true;

2060

1370

2061

1371

if(quit_now){

2062

1372

goto end;

2063

1373

}

2064

1374

2065

1375

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

2066

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

2067

exitcode = EX_UNAVAILABLE;

1376

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

1377

exitcode = EXIT_FAILURE;

2068

1378

goto end;

2069

1379

} else {

2070

1380

gpgme_initialized = true;

2079

1389

/* (Mainly meant for debugging) */

2080

1390

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

2081

1391

if(address == NULL){

2082

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

2083

exitcode = EX_USAGE;

1392

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

1393

exitcode = EXIT_FAILURE;

2084

1394

goto end;

2085

1395

}

2086

1396

2093

1403

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

2094

1404

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

2095

1405

or tmpmax != (uint16_t)tmpmax){

2096

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

2097

exitcode = EX_USAGE;

1406

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

1407

exitcode = EXIT_FAILURE;

2098

1408

goto end;

2099

1409

}

2100

1410

2104

1414

2105

1415

port = (uint16_t)tmpmax;

2106

1416

*address = '\0';

1417

address = connect_to;

2107

1418

/* Colon in address indicates IPv6 */

2108

1419

int af;

2109

if(strchr(connect_to, ':') != NULL){

1420

if(strchr(address, ':') != NULL){

2110

1421

af = AF_INET6;

2111

/* Accept [] around IPv6 address - see RFC 5952 */

2112

if(connect_to[0] == '[' and address[-1] == ']')

2113

{

2114

connect_to++;

2115

address[-1] = '\0';

2116

}

2117

1422

} else {

2118

1423

af = AF_INET;

2119

1424

}

2120

address = connect_to;

2121

1425

2122

1426

if(quit_now){

2123

1427

goto end;

2124

1428

}

2125

1429

2126

while(not quit_now){

2127

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

2128

if(quit_now or ret == 0){

2129

break;

2130

}

2131

if(debug){

2132

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

2133

(int)retry_interval);

2134

}

2135

sleep((int)retry_interval);

2136

}

2137

2138

if (not quit_now){

1430

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

1431

if(ret < 0){

1432

exitcode = EXIT_FAILURE;

1433

} else {

2139

1434

exitcode = EXIT_SUCCESS;

2140

1435

}

2141

2142

1436

goto end;

2143

1437

}

2144

1438

2166

1460

2167

1461

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

2168

1462

if(mc.server == NULL){

2169

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

2170

avahi_strerror(error));

2171

exitcode = EX_UNAVAILABLE;

1463

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

1464

avahi_strerror(error));

1465

exitcode = EXIT_FAILURE;

2172

1466

goto end;

2173

1467

}

2174

1468

2181

1475

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2182

1476

NULL, 0, browse_callback, NULL);

2183

1477

if(sb == NULL){

2184

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

2185

avahi_strerror(avahi_server_errno(mc.server)));

2186

exitcode = EX_UNAVAILABLE;

1478

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

1479

avahi_strerror(avahi_server_errno(mc.server)));

1480

exitcode = EXIT_FAILURE;

2187

1481

goto end;

2188

1482

}

2189

1483

2194

1488

/* Run the main loop */

2195

1489

2196

1490

if(debug){

2197

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

2198

}

2199

2200

ret = avahi_loop_with_timeout(mc.simple_poll,

2201

(int)(retry_interval * 1000));

2202

if(debug){

2203

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

2204

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

2205

}

1491

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

1492

}

1493

1494

avahi_simple_poll_loop(mc.simple_poll);

2206

1495

2207

1496

end:

2208

1497

2209

1498

if(debug){

2210

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

1499

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

2211

1500

}

2212

1501

2213

1502

/* Cleanup things */

2230

1519

gpgme_release(mc.ctx);

2231

1520

}

2232

1521

2233

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

2234

has seen */

2235

if(mc.current_server != NULL){

2236

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

2237

while(mc.current_server != NULL){

2238

server *next = mc.current_server->next;

2239

free(mc.current_server);

2240

mc.current_server = next;

2241

}

2242

}

2243

2244

/* Run network hooks */

2245

run_network_hooks("stop", interface, delay);

2246

2247

/* Re-raise priviliges */

2248

{

1522

/* Take down the network interface */

1523

if(take_down_interface){

1524

/* Re-raise priviliges */

2249

1525

errno = 0;

2250

1526

ret = seteuid(0);

2251

1527

if(ret == -1){

2252

perror_plus("seteuid");

1528

perror("seteuid");

2253

1529

}

2254

2255

/* Take down the network interface */

2256

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

1530

if(geteuid() == 0){

2257

1531

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

2258

1532

if(ret == -1){

2259

perror_plus("ioctl SIOCGIFFLAGS");

2260

} else if(network.ifr_flags & IFF_UP){

2261

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

1533

perror("ioctl SIOCGIFFLAGS");

1534

} else if(network.ifr_flags & IFF_UP) {

1535

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

2262

1536

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

2263

1537

if(ret == -1){

2264

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1538

perror("ioctl SIOCSIFFLAGS");

2265

1539

}

2266

1540

}

2267

1541

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

2268

1542

if(ret == -1){

2269

perror_plus("close");

1543

perror("close");

1544

}

1545

/* Lower privileges permanently */

1546

errno = 0;

1547

ret = setuid(uid);

1548

if(ret == -1){

1549

perror("setuid");

2270

1550

}

2271

1551

}

2272

1552

}

2273

/* Lower privileges permanently */

2274

errno = 0;

2275

ret = setuid(uid);

2276

if(ret == -1){

2277

perror_plus("setuid");

2278

}

2279

1553

2280

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

1554

/* Removes the temp directory used by GPGME */

2281

1555

if(tempdir_created){

2282

struct dirent **direntries = NULL;

2283

struct dirent *direntry = NULL;

2284

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

2285

alphasort);

2286

if (numentries > 0){

2287

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

2288

direntry = direntries[i];

1556

DIR *d;

1557

struct dirent *direntry;

1558

d = opendir(tempdir);

1559

if(d == NULL){

1560

if(errno != ENOENT){

1561

perror("opendir");

1562

}

1563

} else {

1564

while(true){

1565

direntry = readdir(d);

1566

if(direntry == NULL){

1567

break;

1568

}

1569

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

1570

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

1571

and (direntry->d_name[1] == '\0'

1572

or (direntry->d_name[1] == '.'

1573

and direntry->d_name[2] == '\0'))){

1574

continue;

1575

}

2289

1576

char *fullname = NULL;

2290

1577

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

2291

1578

direntry->d_name);

2292

1579

if(ret < 0){

2293

perror_plus("asprintf");

1580

perror("asprintf");

2294

1581

continue;

2295

1582

}

2296

1583

ret = remove(fullname);

2297

1584

if(ret == -1){

2298

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

2299

strerror(errno));

1585

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

1586

strerror(errno));

2300

1587

}

2301

1588

free(fullname);

2302

1589

}

2303

}

2304

2305

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

2306

free(direntries);

2307

if (numentries == -1){

2308

perror_plus("scandir");

1590

closedir(d);

2309

1591

}

2310

1592

ret = rmdir(tempdir);

2311

1593

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

2312

perror_plus("rmdir");

1594

perror("rmdir");

2313

1595

}

2314

1596

}

2315

1597

2316

1598

if(quit_now){

2317

1599

sigemptyset(&old_sigterm_action.sa_mask);

2318

1600

old_sigterm_action.sa_handler = SIG_DFL;

2319

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

2320

&old_sigterm_action,

2321

NULL));

1601

ret = sigaction(signal_received, &old_sigterm_action, NULL);

2322

1602

if(ret == -1){

2323

perror_plus("sigaction");

2324

}

2325

do {

2326

ret = raise(signal_received);

2327

} while(ret != 0 and errno == EINTR);

2328

if(ret != 0){

2329

perror_plus("raise");

2330

abort();

2331

}

2332

TEMP_FAILURE_RETRY(pause());

1603

perror("sigaction");

1604

}

1605

raise(signal_received);

2333

1606

}

2334

1607

2335

1608

return exitcode;