/mandos/trunk : revision 314

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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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#ifndef _LARGEFILE_SOURCE

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33

#define _LARGEFILE_SOURCE

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#endif

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#ifndef _FILE_OFFSET_BITS

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#define _FILE_OFFSET_BITS 64

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#endif

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

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stdout, ferror(), 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, 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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INET_ADDRSTRLEN, INET6_ADDRSTRLEN

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*/

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

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

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setgid(), pause() */

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

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

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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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argp_parse(), ARGP_KEY_ARG,

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ARGP_KEY_END, ARGP_ERR_UNKNOWN */

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

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sigaction(), SIGTERM, sig_atomic_t,

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raise() */

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

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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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#include <sys/wait.h> /* waitpid(), WIFEXITED(),

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WEXITSTATUS(), WTERMSIG() */

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sigaction(), SIGTERM, sigaction,

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sig_atomic_t */

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#ifdef __linux__

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

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init_gnutls_session(),

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102

GNUTLS_* */

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103

#include <gnutls/openpgp.h>

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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116

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/* GPGME */

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

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116

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

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117

#define SECKEY "seckey.txt"

127

118

#define PUBKEY "pubkey.txt"

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

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119

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bool debug = false;

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121

static const char mandos_protocol_version[] = "1";

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122

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

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

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

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char *connect_to = NULL;

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const char *hookdir = HOOKDIR;

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

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typedef struct server{

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const char *ip;

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uint16_t port;

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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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149

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

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126

typedef struct {

155

131

gnutls_dh_params_t dh_params;

156

132

const char *priority;

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133

gpgme_ctx_t ctx;

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server *current_server;

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134

} mandos_context;

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135

161

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

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

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138

.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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167

sig_atomic_t quit_now = 0;

168

int signal_received = 0;

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170

/* Function to use when printing errors */

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void perror_plus(const char *print_text){

172

fprintf(stderr, "Mandos plugin %s: ",

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program_invocation_short_name);

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perror(print_text);

175

}

176

177

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

178

va_list ap;

179

va_start (ap, format);

180

181

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

182

program_invocation_short_name));

183

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

184

}

139

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

185

140

186

141

/*

187

142

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

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144

* "buffer_length" is how much is already used.

190

145

*/

191

146

size_t incbuffer(char **buffer, size_t buffer_length,

192

size_t buffer_capacity){

147

size_t buffer_capacity){

193

148

if(buffer_length + BUFFER_SIZE > buffer_capacity){

194

149

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

195

150

if(buffer == NULL){

200

155

return buffer_capacity;

201

156

}

202

157

203

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

204

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

205

int af){

206

int ret;

207

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

208

if(new_server == NULL){

209

perror_plus("malloc");

210

return -1;

211

}

212

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

213

.port = port,

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.if_index = if_index,

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.af = af };

216

if(new_server->ip == NULL){

217

perror_plus("strdup");

218

return -1;

219

}

220

/* Special case of first server */

221

if (mc.current_server == NULL){

222

new_server->next = new_server;

223

new_server->prev = new_server;

224

mc.current_server = new_server;

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

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} else {

227

new_server->next = mc.current_server;

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

229

new_server->prev->next = new_server;

230

mc.current_server->prev = new_server;

231

}

232

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

233

if(ret == -1){

234

perror_plus("clock_gettime");

235

return -1;

236

}

237

return 0;

238

}

239

240

158

/*

241

159

* Initialize GPGME.

242

160

*/

243

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

244

const char *tempdir){

161

static bool init_gpgme(const char *seckey,

162

const char *pubkey, const char *tempdir){

163

int ret;

245

164

gpgme_error_t rc;

246

165

gpgme_engine_info_t engine_info;

247

166

250

169

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

251

170

*/

252

171

bool import_key(const char *filename){

253

int ret;

254

172

int fd;

255

173

gpgme_data_t pgp_data;

256

174

257

175

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

258

176

if(fd == -1){

259

perror_plus("open");

177

perror("open");

260

178

return false;

261

179

}

262

180

263

181

rc = gpgme_data_new_from_fd(&pgp_data, fd);

264

182

if(rc != GPG_ERR_NO_ERROR){

265

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

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gpgme_strsource(rc), gpgme_strerror(rc));

183

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

184

gpgme_strsource(rc), gpgme_strerror(rc));

267

185

return false;

268

186

}

269

187

270

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rc = gpgme_op_import(mc.ctx, pgp_data);

271

189

if(rc != GPG_ERR_NO_ERROR){

272

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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193

}

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

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196

if(ret == -1){

279

perror_plus("close");

197

perror("close");

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}

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gpgme_data_release(pgp_data);

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return true;

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201

}

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if(debug){

286

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

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

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}

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289

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/* Init GPGME */

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208

gpgme_check_version(NULL);

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rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

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210

if(rc != GPG_ERR_NO_ERROR){

293

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

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gpgme_strsource(rc), gpgme_strerror(rc));

211

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

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gpgme_strsource(rc), gpgme_strerror(rc));

295

213

return false;

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214

}

297

215

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

216

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

299

217

rc = gpgme_get_engine_info(&engine_info);

300

218

if(rc != GPG_ERR_NO_ERROR){

301

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

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gpgme_strsource(rc), gpgme_strerror(rc));

219

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

220

gpgme_strsource(rc), gpgme_strerror(rc));

303

221

return false;

304

222

}

305

223

while(engine_info != NULL){

311

229

engine_info = engine_info->next;

312

230

}

313

231

if(engine_info == NULL){

314

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

315

tempdir);

232

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

316

233

return false;

317

234

}

318

235

319

236

/* Create new GPGME "context" */

320

237

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

321

238

if(rc != GPG_ERR_NO_ERROR){

322

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

323

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

324

gpgme_strerror(rc));

239

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

240

gpgme_strsource(rc), gpgme_strerror(rc));

325

241

return false;

326

242

}

327

243

329

245

return false;

330

246

}

331

247

332

return true;

248

return true;

333

249

}

334

250

335

251

/*

346

262

ssize_t plaintext_length = 0;

347

263

348

264

if(debug){

349

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

265

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

350

266

}

351

267

352

268

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

353

269

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

354

270

0);

355

271

if(rc != GPG_ERR_NO_ERROR){

356

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

357

gpgme_strsource(rc), gpgme_strerror(rc));

272

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

273

gpgme_strsource(rc), gpgme_strerror(rc));

358

274

return -1;

359

275

}

360

276

361

277

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

362

278

rc = gpgme_data_new(&dh_plain);

363

279

if(rc != GPG_ERR_NO_ERROR){

364

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

365

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

366

gpgme_strsource(rc), gpgme_strerror(rc));

280

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

281

gpgme_strsource(rc), gpgme_strerror(rc));

367

282

gpgme_data_release(dh_crypto);

368

283

return -1;

369

284

}

372

287

data buffer */

373

288

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

374

289

if(rc != GPG_ERR_NO_ERROR){

375

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

376

gpgme_strsource(rc), gpgme_strerror(rc));

290

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

291

gpgme_strsource(rc), gpgme_strerror(rc));

377

292

plaintext_length = -1;

378

293

if(debug){

379

294

gpgme_decrypt_result_t result;

380

295

result = gpgme_op_decrypt_result(mc.ctx);

381

296

if(result == NULL){

382

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

297

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

383

298

} else {

384

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

385

result->unsupported_algorithm);

386

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

387

result->wrong_key_usage);

299

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

300

result->unsupported_algorithm);

301

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

302

result->wrong_key_usage);

388

303

if(result->file_name != NULL){

389

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

304

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

390

305

}

391

306

gpgme_recipient_t recipient;

392

307

recipient = result->recipients;

393

while(recipient != NULL){

394

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

395

gpgme_pubkey_algo_name

396

(recipient->pubkey_algo));

397

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

398

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

399

recipient->status == GPG_ERR_NO_SECKEY

400

? "No" : "Yes");

401

recipient = recipient->next;

308

if(recipient){

309

while(recipient != NULL){

310

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

311

gpgme_pubkey_algo_name(recipient->pubkey_algo));

312

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

313

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

314

recipient->status == GPG_ERR_NO_SECKEY

315

? "No" : "Yes");

316

recipient = recipient->next;

317

}

402

318

}

403

319

}

404

320

}

406

322

}

407

323

408

324

if(debug){

409

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

325

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

410

326

}

411

327

412

328

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

413

329

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

414

perror_plus("gpgme_data_seek");

330

perror("gpgme_data_seek");

415

331

plaintext_length = -1;

416

332

goto decrypt_end;

417

333

}

419

335

*plaintext = NULL;

420

336

while(true){

421

337

plaintext_capacity = incbuffer(plaintext,

422

(size_t)plaintext_length,

423

plaintext_capacity);

338

(size_t)plaintext_length,

339

plaintext_capacity);

424

340

if(plaintext_capacity == 0){

425

perror_plus("incbuffer");

426

plaintext_length = -1;

427

goto decrypt_end;

341

perror("incbuffer");

342

plaintext_length = -1;

343

goto decrypt_end;

428

344

}

429

345

430

346

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

435

351

break;

436

352

}

437

353

if(ret < 0){

438

perror_plus("gpgme_data_read");

354

perror("gpgme_data_read");

439

355

plaintext_length = -1;

440

356

goto decrypt_end;

441

357

}

443

359

}

444

360

445

361

if(debug){

446

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

362

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

447

363

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

448

364

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

449

365

}

471

387

/* GnuTLS log function callback */

472

388

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

473

389

const char* string){

474

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

390

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

475

391

}

476

392

477

393

static int init_gnutls_global(const char *pubkeyfilename,

479

395

int ret;

480

396

481

397

if(debug){

482

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

398

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

483

399

}

484

400

485

401

ret = gnutls_global_init();

486

402

if(ret != GNUTLS_E_SUCCESS){

487

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

488

safer_gnutls_strerror(ret));

403

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

404

safer_gnutls_strerror(ret));

489

405

return -1;

490

406

}

491

407

498

414

}

499

415

500

416

/* OpenPGP credentials */

501

ret = gnutls_certificate_allocate_credentials(&mc.cred);

417

gnutls_certificate_allocate_credentials(&mc.cred);

502

418

if(ret != GNUTLS_E_SUCCESS){

503

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

504

safer_gnutls_strerror(ret));

419

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

420

from

421

-Wunreachable-code

422

*/

423

safer_gnutls_strerror(ret));

505

424

gnutls_global_deinit();

506

425

return -1;

507

426

}

508

427

509

428

if(debug){

510

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

511

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

512

pubkeyfilename,

513

seckeyfilename);

429

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

430

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

431

seckeyfilename);

514

432

}

515

433

516

434

ret = gnutls_certificate_set_openpgp_key_file

517

435

(mc.cred, pubkeyfilename, seckeyfilename,

518

436

GNUTLS_OPENPGP_FMT_BASE64);

519

437

if(ret != GNUTLS_E_SUCCESS){

520

fprintf_plus(stderr,

521

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

522

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

523

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

524

safer_gnutls_strerror(ret));

438

fprintf(stderr,

439

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

440

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

441

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

442

safer_gnutls_strerror(ret));

525

443

goto globalfail;

526

444

}

527

445

528

446

/* GnuTLS server initialization */

529

447

ret = gnutls_dh_params_init(&mc.dh_params);

530

448

if(ret != GNUTLS_E_SUCCESS){

531

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

532

" initialization: %s\n",

533

safer_gnutls_strerror(ret));

449

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

450

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

534

451

goto globalfail;

535

452

}

536

453

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

537

454

if(ret != GNUTLS_E_SUCCESS){

538

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

539

safer_gnutls_strerror(ret));

455

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

456

safer_gnutls_strerror(ret));

540

457

goto globalfail;

541

458

}

542

459

555

472

static int init_gnutls_session(gnutls_session_t *session){

556

473

int ret;

557

474

/* GnuTLS session creation */

558

do {

559

ret = gnutls_init(session, GNUTLS_SERVER);

560

if(quit_now){

561

return -1;

562

}

563

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

475

ret = gnutls_init(session, GNUTLS_SERVER);

564

476

if(ret != GNUTLS_E_SUCCESS){

565

fprintf_plus(stderr,

566

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

567

safer_gnutls_strerror(ret));

477

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

478

safer_gnutls_strerror(ret));

568

479

}

569

480

570

481

{

571

482

const char *err;

572

do {

573

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

574

if(quit_now){

575

gnutls_deinit(*session);

576

return -1;

577

}

578

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

483

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

579

484

if(ret != GNUTLS_E_SUCCESS){

580

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

581

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

582

safer_gnutls_strerror(ret));

485

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

486

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

487

safer_gnutls_strerror(ret));

583

488

gnutls_deinit(*session);

584

489

return -1;

585

490

}

586

491

}

587

492

588

do {

589

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

590

mc.cred);

591

if(quit_now){

592

gnutls_deinit(*session);

593

return -1;

594

}

595

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

493

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

494

mc.cred);

596

495

if(ret != GNUTLS_E_SUCCESS){

597

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

598

safer_gnutls_strerror(ret));

496

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

497

safer_gnutls_strerror(ret));

599

498

gnutls_deinit(*session);

600

499

return -1;

601

500

}

602

501

603

502

/* ignore client certificate if any. */

604

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

503

gnutls_certificate_server_set_request(*session,

504

GNUTLS_CERT_IGNORE);

605

505

606

506

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

607

507

616

516

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

617

517

AvahiIfIndex if_index,

618

518

int af){

619

int ret, tcp_sd = -1;

519

int ret, tcp_sd;

620

520

ssize_t sret;

621

521

union {

622

522

struct sockaddr_in in;

623

523

struct sockaddr_in6 in6;

624

524

} to;

625

525

char *buffer = NULL;

626

char *decrypted_buffer = NULL;

526

char *decrypted_buffer;

627

527

size_t buffer_length = 0;

628

528

size_t buffer_capacity = 0;

529

ssize_t decrypted_buffer_size;

629

530

size_t written;

630

int retval = -1;

531

int retval = 0;

631

532

gnutls_session_t session;

632

533

int pf; /* Protocol family */

633

534

634

errno = 0;

635

636

if(quit_now){

637

errno = EINTR;

638

return -1;

639

}

640

641

535

switch(af){

642

536

case AF_INET6:

643

537

pf = PF_INET6;

646

540

pf = PF_INET;

647

541

break;

648

542

default:

649

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

650

errno = EINVAL;

543

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

651

544

return -1;

652

545

}

653

546

657

550

}

658

551

659

552

if(debug){

660

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

661

PRIu16 "\n", ip, port);

553

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

554

"\n", ip, port);

662

555

}

663

556

664

557

tcp_sd = socket(pf, SOCK_STREAM, 0);

665

558

if(tcp_sd < 0){

666

int e = errno;

667

perror_plus("socket");

668

errno = e;

669

goto mandos_end;

670

}

671

672

if(quit_now){

673

errno = EINTR;

674

goto mandos_end;

559

perror("socket");

560

return -1;

675

561

}

676

562

677

563

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

678

564

if(af == AF_INET6){

679

to.in6.sin6_family = (sa_family_t)af;

565

to.in6.sin6_family = (uint16_t)af;

680

566

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

681

567

} else { /* IPv4 */

682

568

to.in.sin_family = (sa_family_t)af;

683

569

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

684

570

}

685

571

if(ret < 0 ){

686

int e = errno;

687

perror_plus("inet_pton");

688

errno = e;

689

goto mandos_end;

572

perror("inet_pton");

573

return -1;

690

574

}

691

575

if(ret == 0){

692

int e = errno;

693

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

694

errno = e;

695

goto mandos_end;

576

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

577

return -1;

696

578

}

697

579

if(af == AF_INET6){

698

580

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

701

583

702

584

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

703

585

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

704

-Wunreachable-code*/

586

-Wunreachable-code*/

705

587

if(if_index == AVAHI_IF_UNSPEC){

706

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

707

" incomplete without a network interface\n");

708

errno = EINVAL;

709

goto mandos_end;

588

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

589

" without a network interface\n");

590

return -1;

710

591

}

711

592

/* Set the network interface number as scope */

712

593

to.in6.sin6_scope_id = (uint32_t)if_index;

717

598

-Wunreachable-code */

718

599

}

719

600

720

if(quit_now){

721

errno = EINTR;

722

goto mandos_end;

723

}

724

725

601

if(debug){

726

602

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

727

603

char interface[IF_NAMESIZE];

728

604

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

729

perror_plus("if_indextoname");

605

perror("if_indextoname");

730

606

} else {

731

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

732

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

607

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

608

ip, interface, port);

733

609

}

734

610

} else {

735

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

736

ip, port);

611

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

612

port);

737

613

}

738

614

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

739

615

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

746

622

sizeof(addrstr));

747

623

}

748

624

if(pcret == NULL){

749

perror_plus("inet_ntop");

625

perror("inet_ntop");

750

626

} else {

751

627

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

752

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

628

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

753

629

}

754

630

}

755

631

}

756

632

757

if(quit_now){

758

errno = EINTR;

759

goto mandos_end;

760

}

761

762

633

if(af == AF_INET6){

763

634

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

764

635

} else {

765

636

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

766

637

}

767

638

if(ret < 0){

768

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

769

int e = errno;

770

perror_plus("connect");

771

errno = e;

772

}

773

goto mandos_end;

774

}

775

776

if(quit_now){

777

errno = EINTR;

778

goto mandos_end;

639

perror("connect");

640

return -1;

779

641

}

780

642

781

643

const char *out = mandos_protocol_version;

783

645

while(true){

784

646

size_t out_size = strlen(out);

785

647

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

786

out_size - written));

648

out_size - written));

787

649

if(ret == -1){

788

int e = errno;

789

perror_plus("write");

790

errno = e;

650

perror("write");

651

retval = -1;

791

652

goto mandos_end;

792

653

}

793

654

written += (size_t)ret;

801

662

break;

802

663

}

803

664

}

804

805

if(quit_now){

806

errno = EINTR;

807

goto mandos_end;

808

}

809

665

}

810

666

811

667

if(debug){

812

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

813

}

814

815

if(quit_now){

816

errno = EINTR;

817

goto mandos_end;

818

}

819

820

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

668

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

669

}

670

821

671

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

822

672

823

if(quit_now){

824

errno = EINTR;

825

goto mandos_end;

826

}

827

828

do {

673

do{

829

674

ret = gnutls_handshake(session);

830

if(quit_now){

831

errno = EINTR;

832

goto mandos_end;

833

}

834

675

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

835

676

836

677

if(ret != GNUTLS_E_SUCCESS){

837

678

if(debug){

838

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

679

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

839

680

gnutls_perror(ret);

840

681

}

841

errno = EPROTO;

682

retval = -1;

842

683

goto mandos_end;

843

684

}

844

685

845

686

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

846

687

847

688

if(debug){

848

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

849

" %s\n", ip);

689

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

690

ip);

850

691

}

851

692

852

693

while(true){

853

854

if(quit_now){

855

errno = EINTR;

856

goto mandos_end;

857

}

858

859

694

buffer_capacity = incbuffer(&buffer, buffer_length,

860

buffer_capacity);

695

buffer_capacity);

861

696

if(buffer_capacity == 0){

862

int e = errno;

863

perror_plus("incbuffer");

864

errno = e;

865

goto mandos_end;

866

}

867

868

if(quit_now){

869

errno = EINTR;

697

perror("incbuffer");

698

retval = -1;

870

699

goto mandos_end;

871

700

}

872

701

881

710

case GNUTLS_E_AGAIN:

882

711

break;

883

712

case GNUTLS_E_REHANDSHAKE:

884

do {

713

do{

885

714

ret = gnutls_handshake(session);

886

887

if(quit_now){

888

errno = EINTR;

889

goto mandos_end;

890

}

891

715

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

892

716

if(ret < 0){

893

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

894

"***\n");

717

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

895

718

gnutls_perror(ret);

896

errno = EPROTO;

719

retval = -1;

897

720

goto mandos_end;

898

721

}

899

722

break;

900

723

default:

901

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

902

" encrypted session with Mandos server\n");

724

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

725

" encrypted session with Mandos server\n");

726

retval = -1;

903

727

gnutls_bye(session, GNUTLS_SHUT_RDWR);

904

errno = EIO;

905

728

goto mandos_end;

906

729

}

907

730

} else {

910

733

}

911

734

912

735

if(debug){

913

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

914

}

915

916

if(quit_now){

917

errno = EINTR;

918

goto mandos_end;

919

}

920

921

do {

922

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

923

if(quit_now){

924

errno = EINTR;

925

goto mandos_end;

926

}

927

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

736

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

737

}

738

739

gnutls_bye(session, GNUTLS_SHUT_RDWR);

928

740

929

741

if(buffer_length > 0){

930

ssize_t decrypted_buffer_size;

931

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

742

decrypted_buffer_size = pgp_packet_decrypt(buffer,

743

buffer_length,

932

744

&decrypted_buffer);

933

745

if(decrypted_buffer_size >= 0){

934

935

746

written = 0;

936

747

while(written < (size_t) decrypted_buffer_size){

937

if(quit_now){

938

errno = EINTR;

939

goto mandos_end;

940

}

941

942

748

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

943

749

(size_t)decrypted_buffer_size - written,

944

750

stdout);

945

751

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

946

int e = errno;

947

752

if(debug){

948

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

949

strerror(errno));

753

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

754

strerror(errno));

950

755

}

951

errno = e;

952

goto mandos_end;

756

retval = -1;

757

break;

953

758

}

954

759

written += (size_t)ret;

955

760

}

956

retval = 0;

761

free(decrypted_buffer);

762

} else {

763

retval = -1;

957

764

}

765

} else {

766

retval = -1;

958

767

}

959

768

960

769

/* Shutdown procedure */

961

770

962

771

mandos_end:

963

{

964

int e = errno;

965

free(decrypted_buffer);

966

free(buffer);

967

if(tcp_sd >= 0){

968

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

969

}

970

if(ret == -1){

971

if(e == 0){

972

e = errno;

973

}

974

perror_plus("close");

975

}

976

gnutls_deinit(session);

977

errno = e;

978

if(quit_now){

979

errno = EINTR;

980

retval = -1;

981

}

772

free(buffer);

773

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

774

if(ret == -1){

775

perror("close");

982

776

}

777

gnutls_deinit(session);

983

778

return retval;

984

779

}

985

780

1002

797

/* Called whenever a service has been resolved successfully or

1003

798

timed out */

1004

799

1005

if(quit_now){

1006

return;

1007

}

1008

1009

800

switch(event){

1010

801

default:

1011

802

case AVAHI_RESOLVER_FAILURE:

1012

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

1013

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

1014

domain,

1015

avahi_strerror(avahi_server_errno(mc.server)));

803

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

804

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

805

avahi_strerror(avahi_server_errno(mc.server)));

1016

806

break;

1017

807

1018

808

case AVAHI_RESOLVER_FOUND:

1020

810

char ip[AVAHI_ADDRESS_STR_MAX];

1021

811

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

1022

812

if(debug){

1023

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

1024

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

1025

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

813

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

814

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

815

ip, (intmax_t)interface, port);

1026

816

}

1027

817

int ret = start_mandos_communication(ip, port, interface,

1028

818

avahi_proto_to_af(proto));

1029

819

if(ret == 0){

1030

820

avahi_simple_poll_quit(mc.simple_poll);

1031

} else {

1032

ret = add_server(ip, port, interface,

1033

avahi_proto_to_af(proto));

1034

821

}

1035

822

}

1036

823

}

1052

839

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

1053

840

is removed from the LAN */

1054

841

1055

if(quit_now){

1056

return;

1057

}

1058

1059

842

switch(event){

1060

843

default:

1061

844

case AVAHI_BROWSER_FAILURE:

1062

845

1063

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

1064

avahi_strerror(avahi_server_errno(mc.server)));

846

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

847

avahi_strerror(avahi_server_errno(mc.server)));

1065

848

avahi_simple_poll_quit(mc.simple_poll);

1066

849

return;

1067

850

1074

857

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

1075

858

name, type, domain, protocol, 0,

1076

859

resolve_callback, NULL) == NULL)

1077

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

1078

" %s\n", name,

1079

avahi_strerror(avahi_server_errno(mc.server)));

860

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

861

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

1080

862

break;

1081

863

1082

864

case AVAHI_BROWSER_REMOVE:

1085

867

case AVAHI_BROWSER_ALL_FOR_NOW:

1086

868

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1087

869

if(debug){

1088

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

1089

" searching...\n");

870

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

1090

871

}

1091

872

break;

1092

873

}

1093

874

}

1094

875

1095

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

1096

static void handle_sigterm(int sig){

876

sig_atomic_t quit_now = 0;

877

878

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

879

static void handle_sigterm(__attribute__((unused)) int sig){

1097

880

if(quit_now){

1098

881

return;

1099

882

}

1100

883

quit_now = 1;

1101

signal_received = sig;

1102

884

int old_errno = errno;

1103

/* set main loop to exit */

1104

885

if(mc.simple_poll != NULL){

1105

886

avahi_simple_poll_quit(mc.simple_poll);

1106

887

}

1107

888

errno = old_errno;

1108

889

}

1109

890

1110

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

1111

int ret;

1112

1113

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

1114

if(s < 0){

1115

perror_plus("socket");

1116

return false;

1117

}

1118

strcpy(ifr->ifr_name, ifname);

1119

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1120

if(ret == -1){

1121

if(debug){

1122

perror_plus("ioctl SIOCGIFFLAGS");

1123

}

1124

return false;

1125

}

1126

return true;

1127

}

1128

1129

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

1130

1131

/* Reject the loopback device */

1132

if(ifr->ifr_flags & IFF_LOOPBACK){

1133

if(debug){

1134

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

1135

ifname);

1136

}

1137

return false;

1138

}

1139

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

1140

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

1141

if(debug){

1142

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

1143

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

1144

}

1145

return true;

1146

}

1147

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

1148

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

1149

if(debug){

1150

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1151

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

1152

}

1153

return false;

1154

}

1155

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

1156

if(ifr->ifr_flags & IFF_NOARP){

1157

if(debug){

1158

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

1159

ifname);

1160

}

1161

return false;

1162

}

1163

1164

/* Accept this device */

1165

if(debug){

1166

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

1167

}

1168

return true;

1169

}

1170

1171

/*

1172

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

1173

* corresponds to an acceptable network device.

1174

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

1175

*/

1176

int good_interface(const struct dirent *if_entry){

1177

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

1178

return 0;

1179

}

1180

1181

struct ifreq ifr;

1182

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

1183

if(debug){

1184

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

1185

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

1186

}

1187

return 0;

1188

}

1189

1190

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

1191

return 0;

1192

}

1193

return 1;

1194

}

1195

1196

/*

1197

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

1198

* corresponds to an acceptable network device which is up.

1199

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

1200

*/

1201

int up_interface(const struct dirent *if_entry){

1202

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

1203

return 0;

1204

}

1205

1206

struct ifreq ifr;

1207

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

1208

if(debug){

1209

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

1210

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

1211

}

1212

return 0;

1213

}

1214

1215

/* Reject down interfaces */

1216

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

1217

if(debug){

1218

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

1219

if_entry->d_name);

1220

}

1221

return 0;

1222

}

1223

1224

/* Reject non-running interfaces */

1225

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

1226

if(debug){

1227

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

1228

if_entry->d_name);

1229

}

1230

return 0;

1231

}

1232

1233

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

1234

return 0;

1235

}

1236

return 1;

1237

}

1238

1239

int notdotentries(const struct dirent *direntry){

1240

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

1241

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

1242

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

1243

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

1244

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

1245

return 0;

1246

}

1247

return 1;

1248

}

1249

1250

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

1251

int runnable_hook(const struct dirent *direntry){

1252

int ret;

1253

size_t sret;

1254

struct stat st;

1255

1256

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

1257

/* Empty name? */

1258

return 0;

1259

}

1260

1261

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

1262

"abcdefghijklmnopqrstuvwxyz"

1263

"0123456789"

1264

"_-");

1265

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

1266

/* Contains non-allowed characters */

1267

if(debug){

1268

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

1269

direntry->d_name);

1270

}

1271

return 0;

1272

}

1273

1274

char *fullname = NULL;

1275

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

1276

if(ret < 0){

1277

perror_plus("asprintf");

1278

return 0;

1279

}

1280

1281

ret = stat(fullname, &st);

1282

if(ret == -1){

1283

if(debug){

1284

perror_plus("Could not stat hook");

1285

}

1286

return 0;

1287

}

1288

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

1289

/* Not a regular file */

1290

if(debug){

1291

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

1292

direntry->d_name);

1293

}

1294

return 0;

1295

}

1296

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

1297

/* Not executable */

1298

if(debug){

1299

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

1300

direntry->d_name);

1301

}

1302

return 0;

1303

}

1304

return 1;

1305

}

1306

1307

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1308

int ret;

1309

struct timespec now;

1310

struct timespec waited_time;

1311

intmax_t block_time;

1312

1313

while(true){

1314

if(mc.current_server == NULL){

1315

if (debug){

1316

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

1317

" No timeout!\n");

1318

}

1319

ret = avahi_simple_poll_iterate(s, -1);

1320

} else {

1321

if (debug){

1322

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

1323

" it, or wait\n");

1324

}

1325

/* the current time */

1326

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1327

if(ret == -1){

1328

perror_plus("clock_gettime");

1329

return -1;

1330

}

1331

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

1332

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

1333

waited_time.tv_sec = (now.tv_sec

1334

- mc.current_server->last_seen.tv_sec);

1335

waited_time.tv_nsec = (now.tv_nsec

1336

- mc.current_server->last_seen.tv_nsec);

1337

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

1338

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

1339

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

1340

block_time = ((retry_interval

1341

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

1342

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

1343

1344

if (debug){

1345

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

1346

block_time);

1347

}

1348

1349

if(block_time <= 0){

1350

ret = start_mandos_communication(mc.current_server->ip,

1351

mc.current_server->port,

1352

mc.current_server->if_index,

1353

mc.current_server->af);

1354

if(ret == 0){

1355

avahi_simple_poll_quit(mc.simple_poll);

1356

return 0;

1357

}

1358

ret = clock_gettime(CLOCK_MONOTONIC,

1359

&mc.current_server->last_seen);

1360

if(ret == -1){

1361

perror_plus("clock_gettime");

1362

return -1;

1363

}

1364

mc.current_server = mc.current_server->next;

1365

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

1366

servers, but don't block */

1367

}

1368

1369

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

1370

}

1371

if(ret != 0){

1372

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

1373

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

1374

}

1375

}

1376

}

1377

}

1378

1379

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

1380

const float delay){

1381

struct dirent **direntries;

1382

struct dirent *direntry;

1383

int ret;

1384

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

1385

alphasort);

1386

if(numhooks == -1){

1387

perror_plus("scandir");

1388

} else {

1389

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

1390

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

1391

direntry = direntries[0];

1392

char *fullname = NULL;

1393

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

1394

if(ret < 0){

1395

perror_plus("asprintf");

1396

continue;

1397

}

1398

pid_t hook_pid = fork();

1399

if(hook_pid == 0){

1400

/* Child */

1401

dup2(devnull, STDIN_FILENO);

1402

close(devnull);

1403

dup2(STDERR_FILENO, STDOUT_FILENO);

1404

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

1405

if(ret == -1){

1406

perror_plus("setenv");

1407

return false;

1408

}

1409

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

1410

if(ret == -1){

1411

perror_plus("setenv");

1412

return false;

1413

}

1414

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

1415

if(ret == -1){

1416

perror_plus("setenv");

1417

return false;

1418

}

1419

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

1420

if(ret == -1){

1421

perror_plus("setenv");

1422

return false;

1423

}

1424

char *delaystring;

1425

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

1426

if(ret == -1){

1427

perror_plus("asprintf");

1428

return false;

1429

}

1430

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

1431

if(ret == -1){

1432

free(delaystring);

1433

perror_plus("setenv");

1434

return false;

1435

}

1436

free(delaystring);

1437

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

1438

perror_plus("execl");

1439

} else {

1440

int status;

1441

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

1442

perror_plus("waitpid");

1443

free(fullname);

1444

continue;

1445

}

1446

if(WIFEXITED(status)){

1447

if(WEXITSTATUS(status) != 0){

1448

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

1449

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

1450

WEXITSTATUS(status));

1451

free(fullname);

1452

continue;

1453

}

1454

} else if(WIFSIGNALED(status)){

1455

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

1456

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

1457

WTERMSIG(status));

1458

free(fullname);

1459

continue;

1460

} else {

1461

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

1462

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

1463

free(fullname);

1464

continue;

1465

}

1466

}

1467

free(fullname);

1468

if(quit_now){

1469

break;

1470

}

1471

}

1472

close(devnull);

1473

}

1474

return true;

1475

}

1476

1477

891

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

1478

892

AvahiSServiceBrowser *sb = NULL;

1479

893

int error;

1481

895

intmax_t tmpmax;

1482

896

char *tmp;

1483

897

int exitcode = EXIT_SUCCESS;

1484

const char *interface = "";

898

const char *interface = "eth0";

1485

899

struct ifreq network;

1486

int sd = -1;

1487

bool take_down_interface = false;

900

int sd;

1488

901

uid_t uid;

1489

902

gid_t gid;

903

char *connect_to = NULL;

1490

904

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

1491

905

bool tempdir_created = false;

1492

906

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1496

910

bool gnutls_initialized = false;

1497

911

bool gpgme_initialized = false;

1498

912

float delay = 2.5f;

1499

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

1500

retrying the same server again */

1501

913

1502

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

914

struct sigaction old_sigterm_action;

1503

915

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1504

916

1505

uid = getuid();

1506

gid = getgid();

1507

1508

/* Lower any group privileges we might have, just to be safe */

1509

errno = 0;

1510

ret = setgid(gid);

1511

if(ret == -1){

1512

perror_plus("setgid");

1513

}

1514

1515

/* Lower user privileges (temporarily) */

1516

errno = 0;

1517

ret = seteuid(uid);

1518

if(ret == -1){

1519

perror_plus("seteuid");

1520

}

1521

1522

if(quit_now){

1523

goto end;

1524

}

1525

1526

917

{

1527

918

struct argp_option options[] = {

1528

919

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

1557

948

.arg = "SECONDS",

1558

949

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

1559

950

.group = 2 },

1560

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

1561

.arg = "SECONDS",

1562

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

1563

.group = 2 },

1564

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

1565

.arg = "DIR",

1566

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

1567

.group = 2 },

1568

/*

1569

* These reproduce what we would get without ARGP_NO_HELP

1570

*/

1571

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

1572

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

1573

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

1574

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

1575

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

1576

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

1577

951

{ .name = NULL }

1578

952

};

1579

953

1580

954

error_t parse_opt(int key, char *arg,

1581

955

struct argp_state *state){

1582

errno = 0;

1583

956

switch(key){

1584

957

case 128: /* --debug */

1585

958

debug = true;

1601

974

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

1602

975

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

1603

976

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

1604

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

977

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

978

exit(EXIT_FAILURE);

1605

979

}

1606

980

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

1607

981

break;

1612

986

errno = 0;

1613

987

delay = strtof(arg, &tmp);

1614

988

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

1615

argp_error(state, "Bad delay");

1616

}

1617

case 132: /* --retry */

1618

errno = 0;

1619

retry_interval = strtod(arg, &tmp);

1620

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

1621

or (retry_interval * 1000) > INT_MAX

1622

or retry_interval < 0){

1623

argp_error(state, "Bad retry interval");

1624

}

1625

break;

1626

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

1627

hookdir = arg;

1628

break;

1629

/*

1630

* These reproduce what we would get without ARGP_NO_HELP

1631

*/

1632

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

1633

argp_state_help(state, state->out_stream,

1634

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1635

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1636

case -3: /* --usage */

1637

argp_state_help(state, state->out_stream,

1638

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1639

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

1640

fprintf_plus(state->out_stream,

1641

"Mandos plugin mandos-client: ");

1642

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

1643

exit(argp_err_exit_status);

989

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

990

exit(EXIT_FAILURE);

991

}

992

break;

993

case ARGP_KEY_ARG:

994

argp_usage(state);

995

case ARGP_KEY_END:

1644

996

break;

1645

997

default:

1646

998

return ARGP_ERR_UNKNOWN;

1647

999

}

1648

return errno;

1000

return 0;

1649

1001

}

1650

1002

1651

1003

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

1652

1004

.args_doc = "",

1653

1005

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

1654

1006

" passwords from a Mandos server" };

1655

ret = argp_parse(&argp, argc, argv,

1656

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1657

switch(ret){

1658

case 0:

1659

break;

1660

case ENOMEM:

1661

default:

1662

errno = ret;

1663

perror_plus("argp_parse");

1664

exitcode = EX_OSERR;

1665

goto end;

1666

case EINVAL:

1667

exitcode = EX_USAGE;

1668

goto end;

1669

}

1670

}

1671

1672

{

1673

/* Work around Debian bug #633582:

1674

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

1675

struct stat st;

1676

1677

/* Re-raise priviliges */

1678

errno = 0;

1679

ret = seteuid(0);

1680

if(ret == -1){

1681

perror_plus("seteuid");

1682

}

1683

1684

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

1685

int seckey_fd = open(seckey, O_RDONLY);

1686

if(seckey_fd == -1){

1687

perror_plus("open");

1688

} else {

1689

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

1690

if(ret == -1){

1691

perror_plus("fstat");

1692

} else {

1693

if(S_ISREG(st.st_mode)

1694

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

1695

ret = fchown(seckey_fd, uid, gid);

1696

if(ret == -1){

1697

perror_plus("fchown");

1698

}

1699

}

1700

}

1701

TEMP_FAILURE_RETRY(close(seckey_fd));

1702

}

1703

}

1704

1705

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

1706

int pubkey_fd = open(pubkey, O_RDONLY);

1707

if(pubkey_fd == -1){

1708

perror_plus("open");

1709

} else {

1710

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

1711

if(ret == -1){

1712

perror_plus("fstat");

1713

} else {

1714

if(S_ISREG(st.st_mode)

1715

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

1716

ret = fchown(pubkey_fd, uid, gid);

1717

if(ret == -1){

1718

perror_plus("fchown");

1719

}

1720

}

1721

}

1722

TEMP_FAILURE_RETRY(close(pubkey_fd));

1723

}

1724

}

1725

1726

/* Lower privileges */

1727

errno = 0;

1728

ret = seteuid(uid);

1729

if(ret == -1){

1730

perror_plus("seteuid");

1731

}

1732

}

1733

1734

/* Run network hooks */

1735

{

1736

/* Re-raise priviliges */

1737

errno = 0;

1738

ret = seteuid(0);

1739

if(ret == -1){

1740

perror_plus("seteuid");

1741

}

1742

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

1743

goto end;

1744

}

1745

/* Lower privileges */

1746

errno = 0;

1747

ret = seteuid(uid);

1748

if(ret == -1){

1749

perror_plus("seteuid");

1007

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

1008

if(ret == ARGP_ERR_UNKNOWN){

1009

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

1010

exitcode = EXIT_FAILURE;

1011

goto end;

1750

1012

}

1751

1013

}

1752

1014

1754

1016

avahi_set_log_function(empty_log);

1755

1017

}

1756

1018

1757

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

1758

struct dirent **direntries;

1759

/* First look for interfaces that are up */

1760

ret = scandir(sys_class_net, &direntries, up_interface,

1761

alphasort);

1762

if(ret == 0){

1763

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

1764

free(direntries);

1765

ret = scandir(sys_class_net, &direntries, good_interface,

1766

alphasort);

1767

}

1768

if(ret >= 1){

1769

/* Pick the first interface returned */

1770

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

1771

if(debug){

1772

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

1773

}

1774

if(interface == NULL){

1775

perror_plus("malloc");

1776

free(direntries);

1777

exitcode = EXIT_FAILURE;

1778

goto end;

1779

}

1780

free(direntries);

1781

} else {

1782

free(direntries);

1783

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

1784

exitcode = EXIT_FAILURE;

1785

goto end;

1786

}

1787

}

1788

1789

1019

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

1790

1020

from the signal handler */

1791

1021

/* Initialize the pseudo-RNG for Avahi */

1792

1022

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

1793

1023

mc.simple_poll = avahi_simple_poll_new();

1794

1024

if(mc.simple_poll == NULL){

1795

fprintf_plus(stderr,

1796

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

1797

exitcode = EX_UNAVAILABLE;

1025

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

1026

exitcode = EXIT_FAILURE;

1798

1027

goto end;

1799

1028

}

1800

1029

1801

1030

sigemptyset(&sigterm_action.sa_mask);

1802

1031

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

1803

1032

if(ret == -1){

1804

perror_plus("sigaddset");

1805

exitcode = EX_OSERR;

1033

perror("sigaddset");

1034

exitcode = EXIT_FAILURE;

1806

1035

goto end;

1807

1036

}

1808

1037

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

1809

1038

if(ret == -1){

1810

perror_plus("sigaddset");

1811

exitcode = EX_OSERR;

1039

perror("sigaddset");

1040

exitcode = EXIT_FAILURE;

1812

1041

goto end;

1813

1042

}

1814

1043

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

1815

1044

if(ret == -1){

1816

perror_plus("sigaddset");

1817

exitcode = EX_OSERR;

1818

goto end;

1819

}

1820

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

1821

| [[info:libc:Initial Signal Actions]] |

1822

| [[info:libc:Basic Signal Handling]] |

1823

*/

1824

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

1825

if(ret == -1){

1826

perror_plus("sigaction");

1827

return EX_OSERR;

1828

}

1829

if(old_sigterm_action.sa_handler != SIG_IGN){

1830

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

1831

if(ret == -1){

1832

perror_plus("sigaction");

1833

exitcode = EX_OSERR;

1834

goto end;

1835

}

1836

}

1837

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

1838

if(ret == -1){

1839

perror_plus("sigaction");

1840

return EX_OSERR;

1841

}

1842

if(old_sigterm_action.sa_handler != SIG_IGN){

1843

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

1844

if(ret == -1){

1845

perror_plus("sigaction");

1846

exitcode = EX_OSERR;

1847

goto end;

1848

}

1849

}

1850

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

1851

if(ret == -1){

1852

perror_plus("sigaction");

1853

return EX_OSERR;

1854

}

1855

if(old_sigterm_action.sa_handler != SIG_IGN){

1856

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

1857

if(ret == -1){

1858

perror_plus("sigaction");

1859

exitcode = EX_OSERR;

1860

goto end;

1861

}

1862

}

1045

perror("sigaddset");

1046

exitcode = EXIT_FAILURE;

1047

goto end;

1048

}

1049

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

1050

if(ret == -1){

1051

perror("sigaction");

1052

exitcode = EXIT_FAILURE;

1053

goto end;

1054

}

1863

1055

1864

1056

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

1865

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

1866

if_index = (AvahiIfIndex) if_nametoindex(interface);

1867

if(if_index == 0){

1868

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

1869

exitcode = EX_UNAVAILABLE;

1870

goto end;

1871

}

1872

1873

if(quit_now){

1874

goto end;

1875

}

1876

1877

/* Re-raise priviliges */

1878

errno = 0;

1879

ret = seteuid(0);

1880

if(ret == -1){

1881

perror_plus("seteuid");

1882

}

1883

1057

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

1884

1058

#ifdef __linux__

1885

1059

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1886

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

1060

messages to mess up the prompt */

1887

1061

ret = klogctl(8, NULL, 5);

1888

1062

bool restore_loglevel = true;

1889

1063

if(ret == -1){

1890

1064

restore_loglevel = false;

1891

perror_plus("klogctl");

1065

perror("klogctl");

1892

1066

}

1893

1067

#endif /* __linux__ */

1894

1068

1895

1069

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1896

1070

if(sd < 0){

1897

perror_plus("socket");

1898

exitcode = EX_OSERR;

1071

perror("socket");

1072

exitcode = EXIT_FAILURE;

1899

1073

#ifdef __linux__

1900

1074

if(restore_loglevel){

1901

1075

ret = klogctl(7, NULL, 0);

1902

1076

if(ret == -1){

1903

perror_plus("klogctl");

1077

perror("klogctl");

1904

1078

}

1905

1079

}

1906

1080

#endif /* __linux__ */

1907

/* Lower privileges */

1908

errno = 0;

1909

ret = seteuid(uid);

1910

if(ret == -1){

1911

perror_plus("seteuid");

1912

}

1913

1081

goto end;

1914

1082

}

1915

1083

strcpy(network.ifr_name, interface);

1916

1084

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

1917

1085

if(ret == -1){

1918

perror_plus("ioctl SIOCGIFFLAGS");

1086

perror("ioctl SIOCGIFFLAGS");

1919

1087

#ifdef __linux__

1920

1088

if(restore_loglevel){

1921

1089

ret = klogctl(7, NULL, 0);

1922

1090

if(ret == -1){

1923

perror_plus("klogctl");

1091

perror("klogctl");

1924

1092

}

1925

1093

}

1926

1094

#endif /* __linux__ */

1927

exitcode = EX_OSERR;

1928

/* Lower privileges */

1929

errno = 0;

1930

ret = seteuid(uid);

1931

if(ret == -1){

1932

perror_plus("seteuid");

1933

}

1095

exitcode = EXIT_FAILURE;

1934

1096

goto end;

1935

1097

}

1936

1098

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

1937

1099

network.ifr_flags |= IFF_UP;

1938

take_down_interface = true;

1939

1100

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

1940

1101

if(ret == -1){

1941

take_down_interface = false;

1942

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1943

exitcode = EX_OSERR;

1102

perror("ioctl SIOCSIFFLAGS");

1103

exitcode = EXIT_FAILURE;

1944

1104

#ifdef __linux__

1945

1105

if(restore_loglevel){

1946

1106

ret = klogctl(7, NULL, 0);

1947

1107

if(ret == -1){

1948

perror_plus("klogctl");

1108

perror("klogctl");

1949

1109

}

1950

1110

}

1951

1111

#endif /* __linux__ */

1952

/* Lower privileges */

1953

errno = 0;

1954

ret = seteuid(uid);

1955

if(ret == -1){

1956

perror_plus("seteuid");

1957

}

1958

1112

goto end;

1959

1113

}

1960

1114

}

1961

/* Sleep checking until interface is running.

1962

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

1115

/* sleep checking until interface is running */

1963

1116

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

1964

1117

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

1965

1118

if(ret == -1){

1966

perror_plus("ioctl SIOCGIFFLAGS");

1119

perror("ioctl SIOCGIFFLAGS");

1967

1120

} else if(network.ifr_flags & IFF_RUNNING){

1968

1121

break;

1969

1122

}

1970

1123

struct timespec sleeptime = { .tv_nsec = 250000000 };

1971

1124

ret = nanosleep(&sleeptime, NULL);

1972

1125

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

1973

perror_plus("nanosleep");

1126

perror("nanosleep");

1974

1127

}

1975

1128

}

1976

if(not take_down_interface){

1977

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

1978

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

1979

if(ret == -1){

1980

perror_plus("close");

1981

}

1129

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

1130

if(ret == -1){

1131

perror("close");

1982

1132

}

1983

1133

#ifdef __linux__

1984

1134

if(restore_loglevel){

1985

1135

/* Restores kernel loglevel to default */

1986

1136

ret = klogctl(7, NULL, 0);

1987

1137

if(ret == -1){

1988

perror_plus("klogctl");

1138

perror("klogctl");

1989

1139

}

1990

1140

}

1991

1141

#endif /* __linux__ */

1992

/* Lower privileges */

1993

errno = 0;

1994

/* Lower privileges */

1995

ret = seteuid(uid);

1996

if(ret == -1){

1997

perror_plus("seteuid");

1998

}

1999

}

2000

2001

if(quit_now){

2002

goto end;

1142

}

1143

1144

uid = getuid();

1145

gid = getgid();

1146

1147

errno = 0;

1148

setgid(gid);

1149

if(ret == -1){

1150

perror("setgid");

1151

}

1152

1153

ret = setuid(uid);

1154

if(ret == -1){

1155

perror("setuid");

2003

1156

}

2004

1157

2005

1158

ret = init_gnutls_global(pubkey, seckey);

2006

1159

if(ret == -1){

2007

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

2008

exitcode = EX_UNAVAILABLE;

1160

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

1161

exitcode = EXIT_FAILURE;

2009

1162

goto end;

2010

1163

} else {

2011

1164

gnutls_initialized = true;

2012

1165

}

2013

1166

2014

if(quit_now){

2015

goto end;

2016

}

2017

2018

1167

if(mkdtemp(tempdir) == NULL){

2019

perror_plus("mkdtemp");

1168

perror("mkdtemp");

2020

1169

goto end;

2021

1170

}

2022

1171

tempdir_created = true;

2023

1172

2024

if(quit_now){

2025

goto end;

2026

}

2027

2028

1173

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

2029

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

2030

exitcode = EX_UNAVAILABLE;

1174

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

1175

exitcode = EXIT_FAILURE;

2031

1176

goto end;

2032

1177

} else {

2033

1178

gpgme_initialized = true;

2034

1179

}

2035

1180

2036

if(quit_now){

2037

goto end;

1181

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

1182

if_index = (AvahiIfIndex) if_nametoindex(interface);

1183

if(if_index == 0){

1184

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

1185

exitcode = EXIT_FAILURE;

1186

goto end;

1187

}

2038

1188

}

2039

1189

2040

1190

if(connect_to != NULL){

2042

1192

/* (Mainly meant for debugging) */

2043

1193

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

2044

1194

if(address == NULL){

2045

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

2046

exitcode = EX_USAGE;

2047

goto end;

2048

}

2049

2050

if(quit_now){

2051

goto end;

2052

}

2053

1195

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

1196

exitcode = EXIT_FAILURE;

1197

goto end;

1198

}

2054

1199

uint16_t port;

2055

1200

errno = 0;

2056

1201

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

2057

1202

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

2058

1203

or tmpmax != (uint16_t)tmpmax){

2059

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

2060

exitcode = EX_USAGE;

2061

goto end;

2062

}

2063

2064

if(quit_now){

2065

goto end;

2066

}

2067

1204

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

1205

exitcode = EXIT_FAILURE;

1206

goto end;

1207

}

2068

1208

port = (uint16_t)tmpmax;

2069

1209

*address = '\0';

1210

address = connect_to;

2070

1211

/* Colon in address indicates IPv6 */

2071

1212

int af;

2072

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

1213

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

2073

1214

af = AF_INET6;

2074

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

2075

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

2076

{

2077

connect_to++;

2078

address[-1] = '\0';

2079

}

2080

1215

} else {

2081

1216

af = AF_INET;

2082

1217

}

2083

address = connect_to;

2084

2085

if(quit_now){

2086

goto end;

2087

}

2088

2089

while(not quit_now){

2090

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

2091

if(quit_now or ret == 0){

2092

break;

2093

}

2094

if(debug){

2095

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

2096

(int)retry_interval);

2097

}

2098

sleep((int)retry_interval);

2099

}

2100

2101

if (not quit_now){

1218

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

1219

if(ret < 0){

1220

exitcode = EXIT_FAILURE;

1221

} else {

2102

1222

exitcode = EXIT_SUCCESS;

2103

1223

}

1224

goto end;

1225

}

2104

1226

2105

goto end;

2106

}

2107

2108

if(quit_now){

2109

goto end;

2110

}

2111

2112

1227

{

2113

1228

AvahiServerConfig config;

2114

1229

/* Do not publish any local Zeroconf records */

2129

1244

2130

1245

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

2131

1246

if(mc.server == NULL){

2132

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

2133

avahi_strerror(error));

2134

exitcode = EX_UNAVAILABLE;

2135

goto end;

2136

}

2137

2138

if(quit_now){

1247

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

1248

avahi_strerror(error));

1249

exitcode = EXIT_FAILURE;

2139

1250

goto end;

2140

1251

}

2141

1252

2144

1255

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2145

1256

NULL, 0, browse_callback, NULL);

2146

1257

if(sb == NULL){

2147

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

2148

avahi_strerror(avahi_server_errno(mc.server)));

2149

exitcode = EX_UNAVAILABLE;

2150

goto end;

2151

}

2152

2153

if(quit_now){

1258

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

1259

avahi_strerror(avahi_server_errno(mc.server)));

1260

exitcode = EXIT_FAILURE;

2154

1261

goto end;

2155

1262

}

2156

1263

2157

1264

/* Run the main loop */

2158

1265

2159

1266

if(debug){

2160

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

2161

}

2162

2163

ret = avahi_loop_with_timeout(mc.simple_poll,

2164

(int)(retry_interval * 1000));

2165

if(debug){

2166

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

2167

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

2168

}

1267

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

1268

}

1269

1270

avahi_simple_poll_loop(mc.simple_poll);

2169

1271

2170

1272

end:

2171

1273

2172

1274

if(debug){

2173

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

1275

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

2174

1276

}

2175

1277

2176

1278

/* Cleanup things */

2192

1294

if(gpgme_initialized){

2193

1295

gpgme_release(mc.ctx);

2194

1296

}

2195

2196

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

2197

has seen */

2198

if(mc.current_server != NULL){

2199

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

2200

while(mc.current_server != NULL){

2201

server *next = mc.current_server->next;

2202

free(mc.current_server);

2203

mc.current_server = next;

2204

}

2205

}

2206

2207

/* Re-raise priviliges */

2208

{

2209

errno = 0;

2210

ret = seteuid(0);

2211

if(ret == -1){

2212

perror_plus("seteuid");

2213

}

2214

/* Run network hooks */

2215

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

2216

goto end;

2217

}

2218

2219

/* Take down the network interface */

2220

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

2221

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

2222

if(ret == -1){

2223

perror_plus("ioctl SIOCGIFFLAGS");

2224

} else if(network.ifr_flags & IFF_UP){

2225

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

2226

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

2227

if(ret == -1){

2228

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2229

}

2230

}

2231

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

2232

if(ret == -1){

2233

perror_plus("close");

2234

}

2235

}

2236

}

2237

/* Lower privileges permanently */

2238

errno = 0;

2239

ret = setuid(uid);

2240

if(ret == -1){

2241

perror_plus("setuid");

2242

}

2243

2244

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

1297

1298

/* Removes the temp directory used by GPGME */

2245

1299

if(tempdir_created){

2246

struct dirent **direntries = NULL;

2247

struct dirent *direntry = NULL;

2248

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

2249

alphasort);

2250

if (numentries > 0){

2251

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

2252

direntry = direntries[i];

1300

DIR *d;

1301

struct dirent *direntry;

1302

d = opendir(tempdir);

1303

if(d == NULL){

1304

if(errno != ENOENT){

1305

perror("opendir");

1306

}

1307

} else {

1308

while(true){

1309

direntry = readdir(d);

1310

if(direntry == NULL){

1311

break;

1312

}

1313

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

1314

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

1315

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

1316

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

1317

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

1318

continue;

1319

}

2253

1320

char *fullname = NULL;

2254

1321

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

2255

1322

direntry->d_name);

2256

1323

if(ret < 0){

2257

perror_plus("asprintf");

1324

perror("asprintf");

2258

1325

continue;

2259

1326

}

2260

1327

ret = remove(fullname);

2261

1328

if(ret == -1){

2262

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

2263

strerror(errno));

1329

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

1330

strerror(errno));

2264

1331

}

2265

1332

free(fullname);

2266

1333

}

2267

}

2268

2269

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

2270

free(direntries);

2271

if (numentries == -1){

2272

perror_plus("scandir");

1334

closedir(d);

2273

1335

}

2274

1336

ret = rmdir(tempdir);

2275

1337

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

2276

perror_plus("rmdir");

2277

}

2278

}

2279

2280

if(quit_now){

2281

sigemptyset(&old_sigterm_action.sa_mask);

2282

old_sigterm_action.sa_handler = SIG_DFL;

2283

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

2284

&old_sigterm_action,

2285

NULL));

2286

if(ret == -1){

2287

perror_plus("sigaction");

2288

}

2289

do {

2290

ret = raise(signal_received);

2291

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

2292

if(ret != 0){

2293

perror_plus("raise");

2294

abort();

2295

}

2296

TEMP_FAILURE_RETRY(pause());

1338

perror("rmdir");

1339

}

2297

1340

}

2298

1341

2299

1342

return exitcode;