/mandos/release : revision 237.2.50

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/* -*- coding: utf-8 -*- */

2

/*

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* Mandos client - get and decrypt data from a Mandos server

3

* Mandos-client - get and decrypt data from a Mandos server

4

*

5

* This program is partly derived from an example program for an Avahi

6

* service browser, downloaded from

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

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*

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* Everything else is

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13

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*

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15

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

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16

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

32

33

#define _LARGEFILE_SOURCE

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34

#define _FILE_OFFSET_BITS 64

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35

#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */

36

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

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37

#include <stdio.h>

38

#include <assert.h>

39

#include <stdlib.h>

40

#include <time.h>

41

#include <net/if.h> /* if_nametoindex */

42

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

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SIOCSIFFLAGS */

38

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

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stdout, ferror(), sscanf(),

40

remove() */

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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, EXIT_FAILURE,

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srand() */

45

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

46

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

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

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#include <sys/ioctl.h> /* ioctl */

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#include <sys/types.h> /* socket(), inet_pton(), sockaddr,

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sockaddr_in6, PF_INET6,

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SOCK_STREAM, INET6_ADDRSTRLEN,

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uid_t, gid_t, open(), opendir(),

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DIR */

54

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

55

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

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struct in6_addr, inet_pton(),

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connect() */

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

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

60

*/

61

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

62

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

63

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

64

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

44

65

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

45

SIOCSIFFLAGS */

66

SIOCSIFFLAGS, if_indextoname(),

67

if_nametoindex(), IF_NAMESIZE */

68

#include <netinet/in.h>

69

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

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getuid(), getgid(), setuid(),

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setgid() */

72

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

73

#include <iso646.h> /* not, and, or */

74

#include <argp.h> /* struct argp_option, error_t, struct

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argp_state, struct argp,

76

argp_parse(), ARGP_KEY_ARG,

77

ARGP_KEY_END, ARGP_ERR_UNKNOWN */

46

78

79

/* Avahi */

80

/* All Avahi types, constants and functions

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Avahi*, avahi_*,

82

AVAHI_* */

47

83

#include <avahi-core/core.h>

48

84

#include <avahi-core/lookup.h>

49

85

#include <avahi-core/log.h>

51

87

#include <avahi-common/malloc.h>

52

88

#include <avahi-common/error.h>

53

89

54

/* Mandos client part */

55

#include <sys/types.h> /* socket(), inet_pton() */

56

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

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struct in6_addr, inet_pton() */

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#include <gnutls/gnutls.h> /* All GnuTLS stuff */

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#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */

60

61

#include <unistd.h> /* close() */

62

#include <netinet/in.h>

63

#include <stdbool.h> /* true */

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#include <string.h> /* memset */

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

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#include <iso646.h> /* not */

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#include <net/if.h> /* IF_NAMESIZE */

90

/* GnuTLS */

91

#include <gnutls/gnutls.h> /* All GnuTLS types, constants and

92

functions:

93

gnutls_*

94

init_gnutls_session(),

95

GNUTLS_* */

96

#include <gnutls/openpgp.h>

97

/* gnutls_certificate_set_openpgp_key_file(),

98

GNUTLS_OPENPGP_FMT_BASE64 */

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99

69

100

/* GPGME */

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

71

#include <gpgme.h>

72

73

/* getopt_long */

74

#include <getopt.h>

101

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

102

functions:

103

gpgme_*

104

GPGME_PROTOCOL_OpenPGP,

105

GPG_ERR_NO_* */

75

106

76

107

#define BUFFER_SIZE 256

77

108

78

static const char *keydir = "/conf/conf.d/mandos";

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static const char *pubkeyfile = "pubkey.txt";

80

static const char *seckeyfile = "seckey.txt";

109

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

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#define SECKEY "seckey.txt"

111

#define PUBKEY "pubkey.txt"

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112

82

113

bool debug = false;

83

84

const char mandos_protocol_version[] = "1";

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86

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

114

static const char mandos_protocol_version[] = "1";

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

116

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

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118

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

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119

typedef struct {

88

120

AvahiSimplePoll *simple_poll;

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121

AvahiServer *server;

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122

gnutls_certificate_credentials_t cred;

91

123

unsigned int dh_bits;

124

gnutls_dh_params_t dh_params;

92

125

const char *priority;

126

gpgme_ctx_t ctx;

93

127

} mandos_context;

94

128

129

/*

130

* Make room in "buffer" for at least BUFFER_SIZE additional bytes.

131

* "buffer_capacity" is how much is currently allocated,

132

* "buffer_length" is how much is already used.

133

*/

95

134

size_t adjustbuffer(char **buffer, size_t buffer_length,

96

135

size_t buffer_capacity){

97

if (buffer_length + BUFFER_SIZE > buffer_capacity){

136

if(buffer_length + BUFFER_SIZE > buffer_capacity){

98

137

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

99

if (buffer == NULL){

138

if(buffer == NULL){

100

139

return 0;

101

140

}

102

141

buffer_capacity += BUFFER_SIZE;

105

144

}

106

145

107

146

/*

108

* Decrypt OpenPGP data using keyrings in HOMEDIR.

109

* Returns -1 on error

147

* Initialize GPGME.

110

148

*/

111

static ssize_t pgp_packet_decrypt (const char *cryptotext,

112

size_t crypto_size,

113

char **plaintext,

114

const char *homedir){

115

gpgme_data_t dh_crypto, dh_plain;

116

gpgme_ctx_t ctx;

149

static bool init_gpgme(mandos_context *mc, const char *seckey,

150

const char *pubkey, const char *tempdir){

151

int ret;

117

152

gpgme_error_t rc;

118

ssize_t ret;

119

size_t plaintext_capacity = 0;

120

ssize_t plaintext_length = 0;

121

153

gpgme_engine_info_t engine_info;

122

154

123

if (debug){

124

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

155

156

/*

157

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

158

*/

159

bool import_key(const char *filename){

160

int fd;

161

gpgme_data_t pgp_data;

162

163

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

164

if(fd == -1){

165

perror("open");

166

return false;

167

}

168

169

rc = gpgme_data_new_from_fd(&pgp_data, fd);

170

if(rc != GPG_ERR_NO_ERROR){

171

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

172

gpgme_strsource(rc), gpgme_strerror(rc));

173

return false;

174

}

175

176

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

177

if(rc != GPG_ERR_NO_ERROR){

178

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

179

gpgme_strsource(rc), gpgme_strerror(rc));

180

return false;

181

}

182

183

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

184

if(ret == -1){

185

perror("close");

186

}

187

gpgme_data_release(pgp_data);

188

return true;

189

}

190

191

if(debug){

192

fprintf(stderr, "Initialize gpgme\n");

125

193

}

126

194

127

195

/* Init GPGME */

128

196

gpgme_check_version(NULL);

129

197

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

130

if (rc != GPG_ERR_NO_ERROR){

198

if(rc != GPG_ERR_NO_ERROR){

131

199

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

132

200

gpgme_strsource(rc), gpgme_strerror(rc));

133

return -1;

201

return false;

134

202

}

135

203

136

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

137

rc = gpgme_get_engine_info (&engine_info);

138

if (rc != GPG_ERR_NO_ERROR){

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

205

rc = gpgme_get_engine_info(&engine_info);

206

if(rc != GPG_ERR_NO_ERROR){

139

207

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return -1;

209

return false;

142

210

}

143

211

while(engine_info != NULL){

144

212

if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){

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213

gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,

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engine_info->file_name, homedir);

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engine_info->file_name, tempdir);

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break;

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216

}

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engine_info = engine_info->next;

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218

}

151

219

if(engine_info == NULL){

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

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return -1;

220

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

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return false;

222

}

223

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/* Create new GPGME "context" */

225

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

226

if(rc != GPG_ERR_NO_ERROR){

227

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

228

gpgme_strsource(rc), gpgme_strerror(rc));

229

return false;

230

}

231

232

if(not import_key(pubkey) or not import_key(seckey)){

233

return false;

234

}

235

236

return true;

237

}

238

239

/*

240

* Decrypt OpenPGP data.

241

* Returns -1 on error

242

*/

243

static ssize_t pgp_packet_decrypt(const mandos_context *mc,

244

const char *cryptotext,

245

size_t crypto_size,

246

char **plaintext){

247

gpgme_data_t dh_crypto, dh_plain;

248

gpgme_error_t rc;

249

ssize_t ret;

250

size_t plaintext_capacity = 0;

251

ssize_t plaintext_length = 0;

252

253

if(debug){

254

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

154

255

}

155

256

156

257

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

157

258

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

158

259

0);

159

if (rc != GPG_ERR_NO_ERROR){

260

if(rc != GPG_ERR_NO_ERROR){

160

261

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

161

262

gpgme_strsource(rc), gpgme_strerror(rc));

162

263

return -1;

164

265

165

266

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

166

267

rc = gpgme_data_new(&dh_plain);

167

if (rc != GPG_ERR_NO_ERROR){

268

if(rc != GPG_ERR_NO_ERROR){

168

269

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

169

270

gpgme_strsource(rc), gpgme_strerror(rc));

170

271

gpgme_data_release(dh_crypto);

171

272

return -1;

172

273

}

173

274

174

/* Create new GPGME "context" */

175

rc = gpgme_new(&ctx);

176

if (rc != GPG_ERR_NO_ERROR){

177

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

178

gpgme_strsource(rc), gpgme_strerror(rc));

179

plaintext_length = -1;

180

goto decrypt_end;

181

}

182

183

275

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

184

276

data buffer */

185

rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);

186

if (rc != GPG_ERR_NO_ERROR){

277

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

278

if(rc != GPG_ERR_NO_ERROR){

187

279

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

188

280

gpgme_strsource(rc), gpgme_strerror(rc));

189

281

plaintext_length = -1;

282

if(debug){

283

gpgme_decrypt_result_t result;

284

result = gpgme_op_decrypt_result(mc->ctx);

285

if(result == NULL){

286

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

287

} else {

288

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

289

result->unsupported_algorithm);

290

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

291

result->wrong_key_usage);

292

if(result->file_name != NULL){

293

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

294

}

295

gpgme_recipient_t recipient;

296

recipient = result->recipients;

297

if(recipient){

298

while(recipient != NULL){

299

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

300

gpgme_pubkey_algo_name(recipient->pubkey_algo));

301

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

302

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

303

recipient->status == GPG_ERR_NO_SECKEY

304

? "No" : "Yes");

305

recipient = recipient->next;

306

}

307

}

308

}

309

}

190

310

goto decrypt_end;

191

311

}

192

312

194

314

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

195

315

}

196

316

197

if (debug){

198

gpgme_decrypt_result_t result;

199

result = gpgme_op_decrypt_result(ctx);

200

if (result == NULL){

201

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

202

} else {

203

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

204

result->unsupported_algorithm);

205

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

206

result->wrong_key_usage);

207

if(result->file_name != NULL){

208

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

209

}

210

gpgme_recipient_t recipient;

211

recipient = result->recipients;

212

if(recipient){

213

while(recipient != NULL){

214

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

215

gpgme_pubkey_algo_name(recipient->pubkey_algo));

216

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

217

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

218

recipient->status == GPG_ERR_NO_SECKEY

219

? "No" : "Yes");

220

recipient = recipient->next;

221

}

222

}

223

}

224

}

225

226

317

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

227

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

228

perror("pgpme_data_seek");

318

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

319

perror("gpgme_data_seek");

229

320

plaintext_length = -1;

230

321

goto decrypt_end;

231

322

}

232

323

233

324

*plaintext = NULL;

234

325

while(true){

235

plaintext_capacity = adjustbuffer(plaintext, (size_t)plaintext_length,

326

plaintext_capacity = adjustbuffer(plaintext,

327

(size_t)plaintext_length,

236

328

plaintext_capacity);

237

if (plaintext_capacity == 0){

329

if(plaintext_capacity == 0){

238

330

perror("adjustbuffer");

239

331

plaintext_length = -1;

240

332

goto decrypt_end;

243

335

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

244

336

BUFFER_SIZE);

245

337

/* Print the data, if any */

246

if (ret == 0){

338

if(ret == 0){

247

339

/* EOF */

248

340

break;

249

341

}

254

346

}

255

347

plaintext_length += ret;

256

348

}

257

349

258

350

if(debug){

259

351

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

260

352

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

273

365

return plaintext_length;

274

366

}

275

367

276

static const char * safer_gnutls_strerror (int value) {

277

const char *ret = gnutls_strerror (value);

278

if (ret == NULL)

368

static const char * safer_gnutls_strerror(int value) {

369

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

370

-Wunreachable-code */

371

if(ret == NULL)

279

372

ret = "(unknown)";

280

373

return ret;

281

374

}

286

379

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

287

380

}

288

381

289

static int initgnutls(mandos_context *mc, gnutls_session_t *session,

290

gnutls_dh_params_t *dh_params){

382

static int init_gnutls_global(mandos_context *mc,

383

const char *pubkeyfilename,

384

const char *seckeyfilename){

291

385

int ret;

292

386

293

387

if(debug){

294

388

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

295

389

}

296

297

if ((ret = gnutls_global_init ())

298

!= GNUTLS_E_SUCCESS) {

299

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

300

safer_gnutls_strerror(ret));

390

391

ret = gnutls_global_init();

392

if(ret != GNUTLS_E_SUCCESS) {

393

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

394

safer_gnutls_strerror(ret));

301

395

return -1;

302

396

}

303

397

304

if (debug){

398

if(debug){

305

399

/* "Use a log level over 10 to enable all debugging options."

306

400

* - GnuTLS manual

307

401

*/

310

404

}

311

405

312

406

/* OpenPGP credentials */

313

if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))

314

!= GNUTLS_E_SUCCESS) {

315

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

316

safer_gnutls_strerror(ret));

407

gnutls_certificate_allocate_credentials(&mc->cred);

408

if(ret != GNUTLS_E_SUCCESS){

409

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

410

* from

411

* -Wunreachable-code

412

*/

413

safer_gnutls_strerror(ret));

414

gnutls_global_deinit();

317

415

return -1;

318

416

}

319

417

320

418

if(debug){

321

fprintf(stderr, "Attempting to use OpenPGP certificate %s"

322

" and keyfile %s as GnuTLS credentials\n", pubkeyfile,

323

seckeyfile);

419

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

420

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

421

seckeyfilename);

324

422

}

325

423

326

424

ret = gnutls_certificate_set_openpgp_key_file

327

(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);

328

if (ret != GNUTLS_E_SUCCESS) {

425

(mc->cred, pubkeyfilename, seckeyfilename,

426

GNUTLS_OPENPGP_FMT_BASE64);

427

if(ret != GNUTLS_E_SUCCESS) {

329

428

fprintf(stderr,

330

429

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

331

" '%s')\n", ret, pubkeyfile, seckeyfile);

332

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

430

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

431

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

333

432

safer_gnutls_strerror(ret));

334

return -1;

433

goto globalfail;

335

434

}

336

435

337

436

/* GnuTLS server initialization */

338

ret = gnutls_dh_params_init(dh_params);

339

if (ret != GNUTLS_E_SUCCESS) {

340

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

341

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

342

return -1;

343

}

344

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

345

if (ret != GNUTLS_E_SUCCESS) {

346

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

347

safer_gnutls_strerror(ret));

348

return -1;

349

}

350

351

gnutls_certificate_set_dh_params(mc->cred, *dh_params);

352

437

ret = gnutls_dh_params_init(&mc->dh_params);

438

if(ret != GNUTLS_E_SUCCESS) {

439

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

440

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

441

goto globalfail;

442

}

443

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

444

if(ret != GNUTLS_E_SUCCESS) {

445

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

446

safer_gnutls_strerror(ret));

447

goto globalfail;

448

}

449

450

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

451

452

return 0;

453

454

globalfail:

455

456

gnutls_certificate_free_credentials(mc->cred);

457

gnutls_global_deinit();

458

gnutls_dh_params_deinit(mc->dh_params);

459

return -1;

460

}

461

462

static int init_gnutls_session(mandos_context *mc,

463

gnutls_session_t *session){

464

int ret;

353

465

/* GnuTLS session creation */

354

466

ret = gnutls_init(session, GNUTLS_SERVER);

355

if (ret != GNUTLS_E_SUCCESS){

467

if(ret != GNUTLS_E_SUCCESS){

356

468

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

357

469

safer_gnutls_strerror(ret));

358

470

}

360

472

{

361

473

const char *err;

362

474

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

363

if (ret != GNUTLS_E_SUCCESS) {

475

if(ret != GNUTLS_E_SUCCESS) {

364

476

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

365

477

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

366

478

safer_gnutls_strerror(ret));

479

gnutls_deinit(*session);

367

480

return -1;

368

481

}

369

482

}

370

483

371

484

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

372

485

mc->cred);

373

if (ret != GNUTLS_E_SUCCESS) {

486

if(ret != GNUTLS_E_SUCCESS) {

374

487

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

375

488

safer_gnutls_strerror(ret));

489

gnutls_deinit(*session);

376

490

return -1;

377

491

}

378

492

379

493

/* ignore client certificate if any. */

380

gnutls_certificate_server_set_request (*session,

381

GNUTLS_CERT_IGNORE);

494

gnutls_certificate_server_set_request(*session,

495

GNUTLS_CERT_IGNORE);

382

496

383

gnutls_dh_set_prime_bits (*session, mc->dh_bits);

497

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

384

498

385

499

return 0;

386

500

}

394

508

AvahiIfIndex if_index,

395

509

mandos_context *mc){

396

510

int ret, tcp_sd;

397

struct sockaddr_in6 to;

511

ssize_t sret;

512

union { struct sockaddr in; struct sockaddr_in6 in6; } to;

398

513

char *buffer = NULL;

399

514

char *decrypted_buffer;

400

515

size_t buffer_length = 0;

404

519

int retval = 0;

405

520

char interface[IF_NAMESIZE];

406

521

gnutls_session_t session;

407

gnutls_dh_params_t dh_params;

408

522

409

ret = initgnutls (mc, &session, &dh_params);

410

if (ret != 0){

523

ret = init_gnutls_session(mc, &session);

524

if(ret != 0){

411

525

return -1;

412

526

}

413

527

414

528

if(debug){

415

fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",

416

ip, port);

529

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

530

"\n", ip, port);

417

531

}

418

532

419

533

tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);

421

535

perror("socket");

422

536

return -1;

423

537

}

424

538

425

539

if(debug){

426

540

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

427

541

perror("if_indextoname");

430

544

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

431

545

}

432

546

433

memset(&to,0,sizeof(to)); /* Spurious warning */

434

to.sin6_family = AF_INET6;

547

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

548

to.in6.sin6_family = AF_INET6;

435

549

/* It would be nice to have a way to detect if we were passed an

436

550

IPv4 address here. Now we assume an IPv6 address. */

437

ret = inet_pton(AF_INET6, ip, &to.sin6_addr);

438

if (ret < 0 ){

551

ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);

552

if(ret < 0 ){

439

553

perror("inet_pton");

440

554

return -1;

441

555

}

443

557

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

444

558

return -1;

445

559

}

446

to.sin6_port = htons(port); /* Spurious warning */

560

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

561

-Wconversion and

562

-Wunreachable-code */

447

563

448

to.sin6_scope_id = (uint32_t)if_index;

564

to.in6.sin6_scope_id = (uint32_t)if_index;

449

565

450

566

if(debug){

451

fprintf(stderr, "Connection to: %s, port %d\n", ip, port);

567

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

568

port);

452

569

char addrstr[INET6_ADDRSTRLEN] = "";

453

if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr,

570

if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,

454

571

sizeof(addrstr)) == NULL){

455

572

perror("inet_ntop");

456

573

} else {

460

577

}

461

578

}

462

579

463

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

464

if (ret < 0){

580

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

581

if(ret < 0){

465

582

perror("connect");

466

583

return -1;

467

584

}

468

585

469

586

const char *out = mandos_protocol_version;

470

587

written = 0;

471

while (true){

588

while(true){

472

589

size_t out_size = strlen(out);

473

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

590

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

474

591

out_size - written));

475

if (ret == -1){

592

if(ret == -1){

476

593

perror("write");

477

594

retval = -1;

478

595

goto mandos_end;

481

598

if(written < out_size){

482

599

continue;

483

600

} else {

484

if (out == mandos_protocol_version){

601

if(out == mandos_protocol_version){

485

602

written = 0;

486

603

out = "\r\n";

487

604

} else {

489

606

}

490

607

}

491

608

}

492

609

493

610

if(debug){

494

611

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

495

612

}

496

613

497

gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);

498

499

ret = gnutls_handshake (session);

500

501

if (ret != GNUTLS_E_SUCCESS){

614

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

615

616

do{

617

ret = gnutls_handshake(session);

618

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

619

620

if(ret != GNUTLS_E_SUCCESS){

502

621

if(debug){

503

622

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

504

gnutls_perror (ret);

623

gnutls_perror(ret);

505

624

}

506

625

retval = -1;

507

626

goto mandos_end;

513

632

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

514

633

ip);

515

634

}

516

635

517

636

while(true){

518

buffer_capacity = adjustbuffer(&buffer, buffer_length, buffer_capacity);

519

if (buffer_capacity == 0){

637

buffer_capacity = adjustbuffer(&buffer, buffer_length,

638

buffer_capacity);

639

if(buffer_capacity == 0){

520

640

perror("adjustbuffer");

521

641

retval = -1;

522

642

goto mandos_end;

523

643

}

524

644

525

ret = gnutls_record_recv(session, buffer+buffer_length,

526

BUFFER_SIZE);

527

if (ret == 0){

645

sret = gnutls_record_recv(session, buffer+buffer_length,

646

BUFFER_SIZE);

647

if(sret == 0){

528

648

break;

529

649

}

530

if (ret < 0){

531

switch(ret){

650

if(sret < 0){

651

switch(sret){

532

652

case GNUTLS_E_INTERRUPTED:

533

653

case GNUTLS_E_AGAIN:

534

654

break;

535

655

case GNUTLS_E_REHANDSHAKE:

536

ret = gnutls_handshake (session);

537

if (ret < 0){

656

do{

657

ret = gnutls_handshake(session);

658

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

659

if(ret < 0){

538

660

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

539

gnutls_perror (ret);

661

gnutls_perror(ret);

540

662

retval = -1;

541

663

goto mandos_end;

542

664

}

545

667

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

546

668

" encrypted session with Mandos server\n");

547

669

retval = -1;

548

gnutls_bye (session, GNUTLS_SHUT_RDWR);

670

gnutls_bye(session, GNUTLS_SHUT_RDWR);

549

671

goto mandos_end;

550

672

}

551

673

} else {

552

buffer_length += (size_t) ret;

674

buffer_length += (size_t) sret;

553

675

}

554

676

}

555

677

557

679

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

558

680

}

559

681

560

gnutls_bye (session, GNUTLS_SHUT_RDWR);

682

gnutls_bye(session, GNUTLS_SHUT_RDWR);

561

683

562

if (buffer_length > 0){

563

decrypted_buffer_size = pgp_packet_decrypt(buffer,

684

if(buffer_length > 0){

685

decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,

564

686

buffer_length,

565

&decrypted_buffer,

566

keydir);

567

if (decrypted_buffer_size >= 0){

687

&decrypted_buffer);

688

if(decrypted_buffer_size >= 0){

568

689

written = 0;

569

690

while(written < (size_t) decrypted_buffer_size){

570

ret = (int)fwrite (decrypted_buffer + written, 1,

571

(size_t)decrypted_buffer_size - written,

572

stdout);

691

ret = (int)fwrite(decrypted_buffer + written, 1,

692

(size_t)decrypted_buffer_size - written,

693

stdout);

573

694

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

574

695

if(debug){

575

696

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

584

705

} else {

585

706

retval = -1;

586

707

}

708

} else {

709

retval = -1;

587

710

}

588

711

589

712

/* Shutdown procedure */

590

713

591

714

mandos_end:

592

715

free(buffer);

593

close(tcp_sd);

594

gnutls_deinit (session);

595

gnutls_certificate_free_credentials (mc->cred);

596

gnutls_global_deinit ();

716

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

717

if(ret == -1){

718

perror("close");

719

}

720

gnutls_deinit(session);

597

721

return retval;

598

722

}

599

723

612

736

flags,

613

737

void* userdata) {

614

738

mandos_context *mc = userdata;

615

assert(r); /* Spurious warning */

739

assert(r);

616

740

617

741

/* Called whenever a service has been resolved successfully or

618

742

timed out */

619

743

620

switch (event) {

744

switch(event) {

621

745

default:

622

746

case AVAHI_RESOLVER_FAILURE:

623

747

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

630

754

char ip[AVAHI_ADDRESS_STR_MAX];

631

755

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

632

756

if(debug){

633

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

634

" port %d\n", name, host_name, ip, interface, port);

757

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

758

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

759

ip, (intmax_t)interface, port);

635

760

}

636

761

int ret = start_mandos_communication(ip, port, interface, mc);

637

if (ret == 0){

638

exit(EXIT_SUCCESS);

762

if(ret == 0){

763

avahi_simple_poll_quit(mc->simple_poll);

639

764

}

640

765

}

641

766

}

653

778

flags,

654

779

void* userdata) {

655

780

mandos_context *mc = userdata;

656

assert(b); /* Spurious warning */

781

assert(b);

657

782

658

783

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

659

784

is removed from the LAN */

660

785

661

switch (event) {

786

switch(event) {

662

787

default:

663

788

case AVAHI_BROWSER_FAILURE:

664

789

673

798

the callback function is called the Avahi server will free the

674

799

resolver for us. */

675

800

676

if (!(avahi_s_service_resolver_new(mc->server, interface,

801

if(!(avahi_s_service_resolver_new(mc->server, interface,

677

802

protocol, name, type, domain,

678

803

AVAHI_PROTO_INET6, 0,

679

804

resolve_callback, mc)))

693

818

}

694

819

}

695

820

696

/* Combines file name and path and returns the malloced new

697

string. some sane checks could/should be added */

698

static const char *combinepath(const char *first, const char *second){

699

size_t f_len = strlen(first);

700

size_t s_len = strlen(second);

701

char *tmp = malloc(f_len + s_len + 2);

702

if (tmp == NULL){

703

return NULL;

704

}

705

if(f_len > 0){

706

memcpy(tmp, first, f_len); /* Spurious warning */

707

}

708

tmp[f_len] = '/';

709

if(s_len > 0){

710

memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */

711

}

712

tmp[f_len + 1 + s_len] = '\0';

713

return tmp;

714

}

715

716

717

821

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

718

822

AvahiSServiceBrowser *sb = NULL;

719

823

int error;

720

824

int ret;

825

intmax_t tmpmax;

826

int numchars;

721

827

int exitcode = EXIT_SUCCESS;

722

828

const char *interface = "eth0";

723

829

struct ifreq network;

724

830

int sd;

831

uid_t uid;

832

gid_t gid;

725

833

char *connect_to = NULL;

834

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

726

835

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

836

const char *seckey = PATHDIR "/" SECKEY;

837

const char *pubkey = PATHDIR "/" PUBKEY;

838

727

839

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

728

.dh_bits = 1024, .priority = "SECURE256"};

840

.dh_bits = 1024, .priority = "SECURE256"

841

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

842

bool gnutls_initialized = false;

843

bool gpgme_initialized = false;

729

844

730

845

{

731

/* Temporary int to get the address of for getopt_long */

732

int debug_int = debug ? 1 : 0;

733

while (true){

734

struct option long_options[] = {

735

{"debug", no_argument, &debug_int, 1},

736

{"connect", required_argument, NULL, 'c'},

737

{"interface", required_argument, NULL, 'i'},

738

{"keydir", required_argument, NULL, 'd'},

739

{"seckey", required_argument, NULL, 's'},

740

{"pubkey", required_argument, NULL, 'p'},

741

{"dh-bits", required_argument, NULL, 'D'},

742

{"priority", required_argument, NULL, 'P'},

743

{0, 0, 0, 0} };

744

745

int option_index = 0;

746

ret = getopt_long (argc, argv, "i:", long_options,

747

&option_index);

748

749

if (ret == -1){

750

break;

751

}

752

753

switch(ret){

754

case 0:

755

break;

756

case 'i':

757

interface = optarg;

758

break;

759

case 'c':

760

connect_to = optarg;

761

break;

762

case 'd':

763

keydir = optarg;

764

break;

765

case 'p':

766

pubkeyfile = optarg;

767

break;

768

case 's':

769

seckeyfile = optarg;

770

break;

771

case 'D':

772

errno = 0;

773

mc.dh_bits = (unsigned int) strtol(optarg, NULL, 10);

774

if (errno){

775

perror("strtol");

846

struct argp_option options[] = {

847

{ .name = "debug", .key = 128,

848

.doc = "Debug mode", .group = 3 },

849

{ .name = "connect", .key = 'c',

850

.arg = "ADDRESS:PORT",

851

.doc = "Connect directly to a specific Mandos server",

852

.group = 1 },

853

{ .name = "interface", .key = 'i',

854

.arg = "NAME",

855

.doc = "Interface that will be used to search for Mandos"

856

" servers",

857

.group = 1 },

858

{ .name = "seckey", .key = 's',

859

.arg = "FILE",

860

.doc = "OpenPGP secret key file base name",

861

.group = 1 },

862

{ .name = "pubkey", .key = 'p',

863

.arg = "FILE",

864

.doc = "OpenPGP public key file base name",

865

.group = 2 },

866

{ .name = "dh-bits", .key = 129,

867

.arg = "BITS",

868

.doc = "Bit length of the prime number used in the"

869

" Diffie-Hellman key exchange",

870

.group = 2 },

871

{ .name = "priority", .key = 130,

872

.arg = "STRING",

873

.doc = "GnuTLS priority string for the TLS handshake",

874

.group = 1 },

875

{ .name = NULL }

876

};

877

878

error_t parse_opt(int key, char *arg,

879

struct argp_state *state) {

880

switch(key) {

881

case 128: /* --debug */

882

debug = true;

883

break;

884

case 'c': /* --connect */

885

connect_to = arg;

886

break;

887

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

888

interface = arg;

889

break;

890

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

891

seckey = arg;

892

break;

893

case 'p': /* --pubkey */

894

pubkey = arg;

895

break;

896

case 129: /* --dh-bits */

897

ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);

898

if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax

899

or arg[numchars] != '\0'){

900

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

776

901

exit(EXIT_FAILURE);

777

902

}

778

break;

779

case 'P':

780

mc.priority = optarg;

781

break;

782

case '?':

903

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

904

break;

905

case 130: /* --priority */

906

mc.priority = arg;

907

break;

908

case ARGP_KEY_ARG:

909

argp_usage(state);

910

case ARGP_KEY_END:

911

break;

783

912

default:

784

/* getopt_long() has already printed a message about the

785

unrcognized option, so just exit. */

786

exit(EXIT_FAILURE);

787

}

788

}

789

/* Set the global debug flag from the temporary int */

790

debug = debug_int ? true : false;

791

}

792

793

pubkeyfile = combinepath(keydir, pubkeyfile);

794

if (pubkeyfile == NULL){

795

perror("combinepath");

796

exitcode = EXIT_FAILURE;

797

goto end;

798

}

799

800

seckeyfile = combinepath(keydir, seckeyfile);

801

if (seckeyfile == NULL){

802

perror("combinepath");

803

goto end;

913

return ARGP_ERR_UNKNOWN;

914

}

915

return 0;

916

}

917

918

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

919

.args_doc = "",

920

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

921

" passwords from a Mandos server" };

922

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

923

if(ret == ARGP_ERR_UNKNOWN){

924

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

925

exitcode = EXIT_FAILURE;

926

goto end;

927

}

928

}

929

930

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

931

{

932

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

933

if(sd < 0) {

934

perror("socket");

935

exitcode = EXIT_FAILURE;

936

goto end;

937

}

938

strcpy(network.ifr_name, interface);

939

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

940

if(ret == -1){

941

perror("ioctl SIOCGIFFLAGS");

942

exitcode = EXIT_FAILURE;

943

goto end;

944

}

945

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

946

network.ifr_flags |= IFF_UP;

947

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

948

if(ret == -1){

949

perror("ioctl SIOCSIFFLAGS");

950

exitcode = EXIT_FAILURE;

951

goto end;

952

}

953

}

954

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

955

if(ret == -1){

956

perror("close");

957

}

958

}

959

960

uid = getuid();

961

gid = getgid();

962

963

ret = setuid(uid);

964

if(ret == -1){

965

perror("setuid");

966

}

967

968

setgid(gid);

969

if(ret == -1){

970

perror("setgid");

971

}

972

973

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

974

if(ret == -1){

975

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

976

exitcode = EXIT_FAILURE;

977

goto end;

978

} else {

979

gnutls_initialized = true;

980

}

981

982

if(mkdtemp(tempdir) == NULL){

983

perror("mkdtemp");

984

tempdir[0] = '\0';

985

goto end;

986

}

987

988

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

989

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

990

exitcode = EXIT_FAILURE;

991

goto end;

992

} else {

993

gpgme_initialized = true;

804

994

}

805

995

806

996

if_index = (AvahiIfIndex) if_nametoindex(interface);

815

1005

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

816

1006

if(address == NULL){

817

1007

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

818

exit(EXIT_FAILURE);

819

}

820

errno = 0;

821

uint16_t port = (uint16_t) strtol(address+1, NULL, 10);

822

if(errno){

823

perror("Bad port number");

824

exit(EXIT_FAILURE);

825

}

1008

exitcode = EXIT_FAILURE;

1009

goto end;

1010

}

1011

uint16_t port;

1012

ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);

1013

if(ret < 1 or tmpmax != (uint16_t)tmpmax

1014

or address[numchars+1] != '\0'){

1015

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

1016

exitcode = EXIT_FAILURE;

1017

goto end;

1018

}

1019

port = (uint16_t)tmpmax;

826

1020

*address = '\0';

827

1021

address = connect_to;

828

1022

ret = start_mandos_communication(address, port, if_index, &mc);

829

1023

if(ret < 0){

830

exit(EXIT_FAILURE);

1024

exitcode = EXIT_FAILURE;

831

1025

} else {

832

exit(EXIT_SUCCESS);

833

}

834

}

835

836

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

837

{

838

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

839

if(sd < 0) {

840

perror("socket");

841

exitcode = EXIT_FAILURE;

842

goto end;

843

}

844

strcpy(network.ifr_name, interface); /* Spurious warning */

845

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

846

if(ret == -1){

847

perror("ioctl SIOCGIFFLAGS");

848

exitcode = EXIT_FAILURE;

849

goto end;

850

}

851

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

852

network.ifr_flags |= IFF_UP;

853

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

854

if(ret == -1){

855

perror("ioctl SIOCSIFFLAGS");

856

exitcode = EXIT_FAILURE;

857

goto end;

858

}

859

}

860

close(sd);

861

}

862

863

if (not debug){

1026

exitcode = EXIT_SUCCESS;

1027

}

1028

goto end;

1029

}

1030

1031

if(not debug){

864

1032

avahi_set_log_function(empty_log);

865

1033

}

866

1034

869

1037

870

1038

/* Allocate main Avahi loop object */

871

1039

mc.simple_poll = avahi_simple_poll_new();

872

if (mc.simple_poll == NULL) {

1040

if(mc.simple_poll == NULL) {

873

1041

fprintf(stderr, "Avahi: Failed to create simple poll"

874

1042

" object.\n");

875

1043

exitcode = EXIT_FAILURE;

876

1044

goto end;

877

1045

}

878

1046

879

1047

{

880

1048

AvahiServerConfig config;

881

1049

/* Do not publish any local Zeroconf records */

884

1052

config.publish_addresses = 0;

885

1053

config.publish_workstation = 0;

886

1054

config.publish_domain = 0;

887

1055

888

1056

/* Allocate a new server */

889

1057

mc.server = avahi_server_new(avahi_simple_poll_get

890

1058

(mc.simple_poll), &config, NULL,

891

1059

NULL, &error);

892

1060

893

1061

/* Free the Avahi configuration data */

894

1062

avahi_server_config_free(&config);

895

1063

}

896

1064

897

1065

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

898

if (mc.server == NULL) {

1066

if(mc.server == NULL) {

899

1067

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

900

1068

avahi_strerror(error));

901

1069

exitcode = EXIT_FAILURE;

907

1075

AVAHI_PROTO_INET6,

908

1076

"_mandos._tcp", NULL, 0,

909

1077

browse_callback, &mc);

910

if (sb == NULL) {

1078

if(sb == NULL) {

911

1079

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

912

1080

avahi_strerror(avahi_server_errno(mc.server)));

913

1081

exitcode = EXIT_FAILURE;

915

1083

}

916

1084

917

1085

/* Run the main loop */

918

919

if (debug){

1086

1087

if(debug){

920

1088

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

921

1089

}

922

1090

923

1091

avahi_simple_poll_loop(mc.simple_poll);

924

1092

925

1093

end:

926

927

if (debug){

1094

1095

if(debug){

928

1096

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

929

1097

}

930

1098

931

1099

/* Cleanup things */

932

if (sb != NULL)

1100

if(sb != NULL)

933

1101

avahi_s_service_browser_free(sb);

934

1102

935

if (mc.server != NULL)

1103

if(mc.server != NULL)

936

1104

avahi_server_free(mc.server);

937

938

if (mc.simple_poll != NULL)

1105

1106

if(mc.simple_poll != NULL)

939

1107

avahi_simple_poll_free(mc.simple_poll);

940

free(pubkeyfile);

941

free(seckeyfile);

1108

1109

if(gnutls_initialized){

1110

gnutls_certificate_free_credentials(mc.cred);

1111

gnutls_global_deinit();

1112

gnutls_dh_params_deinit(mc.dh_params);

1113

}

1114

1115

if(gpgme_initialized){

1116

gpgme_release(mc.ctx);

1117

}

1118

1119

/* Removes the temp directory used by GPGME */

1120

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

1121

DIR *d;

1122

struct dirent *direntry;

1123

d = opendir(tempdir);

1124

if(d == NULL){

1125

if(errno != ENOENT){

1126

perror("opendir");

1127

}

1128

} else {

1129

while(true){

1130

direntry = readdir(d);

1131

if(direntry == NULL){

1132

break;

1133

}

1134

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

1135

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

1136

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

1137

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

1138

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

1139

continue;

1140

}

1141

char *fullname = NULL;

1142

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

1143

direntry->d_name);

1144

if(ret < 0){

1145

perror("asprintf");

1146

continue;

1147

}

1148

ret = remove(fullname);

1149

if(ret == -1){

1150

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

1151

strerror(errno));

1152

}

1153

free(fullname);

1154

}

1155

closedir(d);

1156

}

1157

ret = rmdir(tempdir);

1158

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

1159

perror("rmdir");

1160

}

1161

}

942

1162

943

1163

return exitcode;

944

1164

}