/mandos/release : revision 237.2.159

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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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32

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

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#ifndef _LARGEFILE_SOURCE

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#define _LARGEFILE_SOURCE

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#endif /* not _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 /* not _FILE_OFFSET_BITS */

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#endif

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

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

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stdout, ferror() */

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

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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(), abort() */

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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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getnameinfo() */

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

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inet_pton(), connect() */

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

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

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*/

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

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strtoimax() */

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

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

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

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

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SIOCSIFFLAGS, if_indextoname(),

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if_nametoindex(), IF_NAMESIZE */

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*/

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

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

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setgid(), pause(), _exit(),

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unlinkat() */

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

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setgid(), pause() */

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

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

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

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argp_state, struct argp,

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

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sigaction(), SIGTERM, sig_atomic_t,

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raise() */

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

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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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

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WEXITSTATUS(), WTERMSIG() */

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#include <grp.h> /* setgroups() */

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#include <argz.h> /* argz_add_sep(), argz_next(),

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argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

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argz_count() */

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

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EAI_SYSTEM, gai_strerror() */

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

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#ifdef __linux__

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

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106

init_gnutls_session(),

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107

GNUTLS_* */

120

108

#include <gnutls/openpgp.h>

121

/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* GPGME */

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

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121

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

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122

#define SECKEY "seckey.txt"

135

123

#define PUBKEY "pubkey.txt"

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

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124

138

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bool debug = false;

139

126

static const char mandos_protocol_version[] = "1";

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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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int hookdir_fd = -1;

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uid_t uid = 65534;

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gid_t gid = 65534;

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149

/* 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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in_port_t port;

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AvahiIfIndex if_index;

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int af;

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struct timespec last_seen;

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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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129

160

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

161

131

typedef struct {

132

AvahiSimplePoll *simple_poll;

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133

AvahiServer *server;

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134

gnutls_certificate_credentials_t cred;

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135

unsigned int dh_bits;

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136

gnutls_dh_params_t dh_params;

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137

const char *priority;

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138

gpgme_ctx_t ctx;

168

server *current_server;

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char *interfaces;

170

size_t interfaces_size;

171

139

} mandos_context;

172

140

173

/* global so signal handler can reach it*/

174

AvahiSimplePoll *simple_poll;

141

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

142

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

143

.dh_bits = 1024, .priority = "SECURE256"

144

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

175

145

176

146

sig_atomic_t quit_now = 0;

177

147

int signal_received = 0;

178

148

179

/* Function to use when printing errors */

180

void perror_plus(const char *print_text){

181

int e = errno;

182

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

183

program_invocation_short_name);

184

errno = e;

185

perror(print_text);

186

}

187

188

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

189

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

190

va_list ap;

191

va_start (ap, format);

192

193

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

194

program_invocation_short_name));

195

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

196

}

197

198

149

/*

199

150

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

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151

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

201

152

* "buffer_length" is how much is already used.

202

153

*/

203

__attribute__((nonnull, warn_unused_result))

204

154

size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

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size_t buffer_capacity){

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156

if(buffer_length + BUFFER_SIZE > buffer_capacity){

207

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

208

if(new_buf == NULL){

209

int old_errno = errno;

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free(*buffer);

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errno = old_errno;

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*buffer = NULL;

157

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

158

if(buffer == NULL){

213

159

return 0;

214

160

}

215

*buffer = new_buf;

216

161

buffer_capacity += BUFFER_SIZE;

217

162

}

218

163

return buffer_capacity;

219

164

}

220

165

221

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

222

__attribute__((nonnull, warn_unused_result))

223

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

224

int af, server **current_server){

225

int ret;

226

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

227

if(new_server == NULL){

228

perror_plus("malloc");

229

return false;

230

}

231

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

232

.port = port,

233

.if_index = if_index,

234

.af = af };

235

if(new_server->ip == NULL){

236

perror_plus("strdup");

237

free(new_server);

238

return false;

239

}

240

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

241

if(ret == -1){

242

perror_plus("clock_gettime");

243

#ifdef __GNUC__

244

#pragma GCC diagnostic push

245

#pragma GCC diagnostic ignored "-Wcast-qual"

246

#endif

247

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

248

#ifdef __GNUC__

249

#pragma GCC diagnostic pop

250

#endif

251

free(new_server);

252

return false;

253

}

254

/* Special case of first server */

255

if(*current_server == NULL){

256

new_server->next = new_server;

257

new_server->prev = new_server;

258

*current_server = new_server;

259

} else {

260

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

261

new_server->next = *current_server;

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

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new_server->prev->next = new_server;

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(*current_server)->prev = new_server;

265

}

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return true;

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}

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269

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/*

270

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* Initialize GPGME.

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168

*/

272

__attribute__((nonnull, warn_unused_result))

273

static bool init_gpgme(const char * const seckey,

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const char * const pubkey,

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const char * const tempdir,

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mandos_context *mc){

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static bool init_gpgme(const char *seckey,

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const char *pubkey, const char *tempdir){

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gpgme_error_t rc;

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gpgme_engine_info_t engine_info;

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174

280

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/*

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

282

177

*/

283

bool import_key(const char * const filename){

178

bool import_key(const char *filename){

284

179

int ret;

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180

int fd;

286

181

gpgme_data_t pgp_data;

287

182

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

289

184

if(fd == -1){

290

perror_plus("open");

185

perror("open");

291

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return false;

292

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}

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

295

190

if(rc != GPG_ERR_NO_ERROR){

296

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

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gpgme_strsource(rc), gpgme_strerror(rc));

191

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

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gpgme_strsource(rc), gpgme_strerror(rc));

298

193

return false;

299

194

}

300

195

301

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

196

rc = gpgme_op_import(mc.ctx, pgp_data);

302

197

if(rc != GPG_ERR_NO_ERROR){

303

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

304

gpgme_strsource(rc), gpgme_strerror(rc));

198

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

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gpgme_strsource(rc), gpgme_strerror(rc));

305

200

return false;

306

201

}

307

202

308

203

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

309

204

if(ret == -1){

310

perror_plus("close");

205

perror("close");

311

206

}

312

207

gpgme_data_release(pgp_data);

313

208

return true;

314

209

}

315

210

316

211

if(debug){

317

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

212

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

318

213

}

319

214

320

215

/* Init GPGME */

321

216

gpgme_check_version(NULL);

322

217

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

323

218

if(rc != GPG_ERR_NO_ERROR){

324

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

325

gpgme_strsource(rc), gpgme_strerror(rc));

219

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

220

gpgme_strsource(rc), gpgme_strerror(rc));

326

221

return false;

327

222

}

328

223

329

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

224

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

330

225

rc = gpgme_get_engine_info(&engine_info);

331

226

if(rc != GPG_ERR_NO_ERROR){

332

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

333

gpgme_strsource(rc), gpgme_strerror(rc));

227

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

228

gpgme_strsource(rc), gpgme_strerror(rc));

334

229

return false;

335

230

}

336

231

while(engine_info != NULL){

342

237

engine_info = engine_info->next;

343

238

}

344

239

if(engine_info == NULL){

345

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

346

tempdir);

240

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

347

241

return false;

348

242

}

349

243

350

244

/* Create new GPGME "context" */

351

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

245

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

352

246

if(rc != GPG_ERR_NO_ERROR){

353

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

354

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

355

gpgme_strerror(rc));

247

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

248

gpgme_strsource(rc), gpgme_strerror(rc));

356

249

return false;

357

250

}

358

251

367

260

* Decrypt OpenPGP data.

368

261

* Returns -1 on error

369

262

*/

370

__attribute__((nonnull, warn_unused_result))

371

263

static ssize_t pgp_packet_decrypt(const char *cryptotext,

372

264

size_t crypto_size,

373

char **plaintext,

374

mandos_context *mc){

265

char **plaintext){

375

266

gpgme_data_t dh_crypto, dh_plain;

376

267

gpgme_error_t rc;

377

268

ssize_t ret;

379

270

ssize_t plaintext_length = 0;

380

271

381

272

if(debug){

382

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

273

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

383

274

}

384

275

385

276

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

386

277

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

387

278

0);

388

279

if(rc != GPG_ERR_NO_ERROR){

389

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

390

gpgme_strsource(rc), gpgme_strerror(rc));

280

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

281

gpgme_strsource(rc), gpgme_strerror(rc));

391

282

return -1;

392

283

}

393

284

394

285

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

395

286

rc = gpgme_data_new(&dh_plain);

396

287

if(rc != GPG_ERR_NO_ERROR){

397

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

398

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

399

gpgme_strsource(rc), gpgme_strerror(rc));

288

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

289

gpgme_strsource(rc), gpgme_strerror(rc));

400

290

gpgme_data_release(dh_crypto);

401

291

return -1;

402

292

}

403

293

404

294

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

405

295

data buffer */

406

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

296

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

407

297

if(rc != GPG_ERR_NO_ERROR){

408

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

409

gpgme_strsource(rc), gpgme_strerror(rc));

298

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

299

gpgme_strsource(rc), gpgme_strerror(rc));

410

300

plaintext_length = -1;

411

301

if(debug){

412

302

gpgme_decrypt_result_t result;

413

result = gpgme_op_decrypt_result(mc->ctx);

303

result = gpgme_op_decrypt_result(mc.ctx);

414

304

if(result == NULL){

415

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

305

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

416

306

} else {

417

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

418

result->unsupported_algorithm);

419

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

420

result->wrong_key_usage);

307

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

308

result->unsupported_algorithm);

309

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

310

result->wrong_key_usage);

421

311

if(result->file_name != NULL){

422

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

312

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

423

313

}

424

314

gpgme_recipient_t recipient;

425

315

recipient = result->recipients;

426

316

while(recipient != NULL){

427

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

428

gpgme_pubkey_algo_name

429

(recipient->pubkey_algo));

430

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

431

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

432

recipient->status == GPG_ERR_NO_SECKEY

433

? "No" : "Yes");

317

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

318

gpgme_pubkey_algo_name(recipient->pubkey_algo));

319

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

320

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

321

recipient->status == GPG_ERR_NO_SECKEY

322

? "No" : "Yes");

434

323

recipient = recipient->next;

435

324

}

436

325

}

439

328

}

440

329

441

330

if(debug){

442

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

331

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

443

332

}

444

333

445

334

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

446

335

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

447

perror_plus("gpgme_data_seek");

336

perror("gpgme_data_seek");

448

337

plaintext_length = -1;

449

338

goto decrypt_end;

450

339

}

452

341

*plaintext = NULL;

453

342

while(true){

454

343

plaintext_capacity = incbuffer(plaintext,

455

(size_t)plaintext_length,

456

plaintext_capacity);

344

(size_t)plaintext_length,

345

plaintext_capacity);

457

346

if(plaintext_capacity == 0){

458

perror_plus("incbuffer");

459

plaintext_length = -1;

460

goto decrypt_end;

347

perror("incbuffer");

348

plaintext_length = -1;

349

goto decrypt_end;

461

350

}

462

351

463

352

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

468

357

break;

469

358

}

470

359

if(ret < 0){

471

perror_plus("gpgme_data_read");

360

perror("gpgme_data_read");

472

361

plaintext_length = -1;

473

362

goto decrypt_end;

474

363

}

476

365

}

477

366

478

367

if(debug){

479

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

368

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

480

369

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

481

370

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

482

371

}

493

382

return plaintext_length;

494

383

}

495

384

496

__attribute__((warn_unused_result, const))

497

static const char *safe_string(const char *str){

498

if(str == NULL)

499

return "(unknown)";

500

return str;

501

}

502

503

__attribute__((warn_unused_result))

504

static const char *safer_gnutls_strerror(int value){

505

const char *ret = gnutls_strerror(value);

506

return safe_string(ret);

385

static const char * safer_gnutls_strerror(int value){

386

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

387

-Wunreachable-code */

388

if(ret == NULL)

389

ret = "(unknown)";

390

return ret;

507

391

}

508

392

509

393

/* GnuTLS log function callback */

510

__attribute__((nonnull))

511

394

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

512

395

const char* string){

513

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

396

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

514

397

}

515

398

516

__attribute__((nonnull, warn_unused_result))

517

399

static int init_gnutls_global(const char *pubkeyfilename,

518

const char *seckeyfilename,

519

const char *dhparamsfilename,

520

mandos_context *mc){

400

const char *seckeyfilename){

521

401

int ret;

522

unsigned int uret;

523

402

524

403

if(debug){

525

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

404

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

526

405

}

527

406

528

407

ret = gnutls_global_init();

529

408

if(ret != GNUTLS_E_SUCCESS){

530

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

531

safer_gnutls_strerror(ret));

409

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

410

safer_gnutls_strerror(ret));

532

411

return -1;

533

412

}

534

413

541

420

}

542

421

543

422

/* OpenPGP credentials */

544

ret = gnutls_certificate_allocate_credentials(&mc->cred);

423

gnutls_certificate_allocate_credentials(&mc.cred);

545

424

if(ret != GNUTLS_E_SUCCESS){

546

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

547

safer_gnutls_strerror(ret));

425

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

426

from

427

-Wunreachable-code

428

*/

429

safer_gnutls_strerror(ret));

548

430

gnutls_global_deinit();

549

431

return -1;

550

432

}

551

433

552

434

if(debug){

553

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

554

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

555

pubkeyfilename,

556

seckeyfilename);

435

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

436

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

437

seckeyfilename);

557

438

}

558

439

559

440

ret = gnutls_certificate_set_openpgp_key_file

560

(mc->cred, pubkeyfilename, seckeyfilename,

441

(mc.cred, pubkeyfilename, seckeyfilename,

561

442

GNUTLS_OPENPGP_FMT_BASE64);

562

443

if(ret != GNUTLS_E_SUCCESS){

563

fprintf_plus(stderr,

564

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

565

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

566

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

567

safer_gnutls_strerror(ret));

444

fprintf(stderr,

445

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

446

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

447

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

448

safer_gnutls_strerror(ret));

568

449

goto globalfail;

569

450

}

570

451

571

452

/* GnuTLS server initialization */

572

ret = gnutls_dh_params_init(&mc->dh_params);

573

if(ret != GNUTLS_E_SUCCESS){

574

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

575

" initialization: %s\n",

576

safer_gnutls_strerror(ret));

577

goto globalfail;

578

}

579

/* If a Diffie-Hellman parameters file was given, try to use it */

580

if(dhparamsfilename != NULL){

581

gnutls_datum_t params = { .data = NULL, .size = 0 };

582

do {

583

int dhpfile = open(dhparamsfilename, O_RDONLY);

584

if(dhpfile == -1){

585

perror_plus("open");

586

dhparamsfilename = NULL;

587

break;

588

}

589

size_t params_capacity = 0;

590

while(true){

591

params_capacity = incbuffer((char **)&params.data,

592

(size_t)params.size,

593

(size_t)params_capacity);

594

if(params_capacity == 0){

595

perror_plus("incbuffer");

596

free(params.data);

597

params.data = NULL;

598

dhparamsfilename = NULL;

599

break;

600

}

601

ssize_t bytes_read = read(dhpfile,

602

params.data + params.size,

603

BUFFER_SIZE);

604

/* EOF */

605

if(bytes_read == 0){

606

break;

607

}

608

/* check bytes_read for failure */

609

if(bytes_read < 0){

610

perror_plus("read");

611

free(params.data);

612

params.data = NULL;

613

dhparamsfilename = NULL;

614

break;

615

}

616

params.size += (unsigned int)bytes_read;

617

}

618

if(params.data == NULL){

619

dhparamsfilename = NULL;

620

}

621

if(dhparamsfilename == NULL){

622

break;

623

}

624

ret = gnutls_dh_params_import_pkcs3(mc->dh_params, &params,

625

GNUTLS_X509_FMT_PEM);

626

if(ret != GNUTLS_E_SUCCESS){

627

fprintf_plus(stderr, "Failed to parse DH parameters in file"

628

" \"%s\": %s\n", dhparamsfilename,

629

safer_gnutls_strerror(ret));

630

dhparamsfilename = NULL;

631

}

632

} while(false);

633

}

634

if(dhparamsfilename == NULL){

635

if(mc->dh_bits == 0){

636

/* Find out the optimal number of DH bits */

637

/* Try to read the private key file */

638

gnutls_datum_t buffer = { .data = NULL, .size = 0 };

639

do {

640

int secfile = open(seckeyfilename, O_RDONLY);

641

if(secfile == -1){

642

perror_plus("open");

643

break;

644

}

645

size_t buffer_capacity = 0;

646

while(true){

647

buffer_capacity = incbuffer((char **)&buffer.data,

648

(size_t)buffer.size,

649

(size_t)buffer_capacity);

650

if(buffer_capacity == 0){

651

perror_plus("incbuffer");

652

free(buffer.data);

653

buffer.data = NULL;

654

break;

655

}

656

ssize_t bytes_read = read(secfile,

657

buffer.data + buffer.size,

658

BUFFER_SIZE);

659

/* EOF */

660

if(bytes_read == 0){

661

break;

662

}

663

/* check bytes_read for failure */

664

if(bytes_read < 0){

665

perror_plus("read");

666

free(buffer.data);

667

buffer.data = NULL;

668

break;

669

}

670

buffer.size += (unsigned int)bytes_read;

671

}

672

close(secfile);

673

} while(false);

674

/* If successful, use buffer to parse private key */

675

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

676

if(buffer.data != NULL){

677

{

678

gnutls_openpgp_privkey_t privkey = NULL;

679

ret = gnutls_openpgp_privkey_init(&privkey);

680

if(ret != GNUTLS_E_SUCCESS){

681

fprintf_plus(stderr, "Error initializing OpenPGP key"

682

" structure: %s",

683

safer_gnutls_strerror(ret));

684

free(buffer.data);

685

buffer.data = NULL;

686

} else {

687

ret = gnutls_openpgp_privkey_import

688

(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);

689

if(ret != GNUTLS_E_SUCCESS){

690

fprintf_plus(stderr, "Error importing OpenPGP key : %s",

691

safer_gnutls_strerror(ret));

692

privkey = NULL;

693

}

694

free(buffer.data);

695

buffer.data = NULL;

696

if(privkey != NULL){

697

/* Use private key to suggest an appropriate

698

sec_param */

699

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

700

gnutls_openpgp_privkey_deinit(privkey);

701

if(debug){

702

fprintf_plus(stderr, "This OpenPGP key implies using"

703

" a GnuTLS security parameter \"%s\".\n",

704

safe_string(gnutls_sec_param_get_name

705

(sec_param)));

706

}

707

}

708

}

709

}

710

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

711

/* Err on the side of caution */

712

sec_param = GNUTLS_SEC_PARAM_ULTRA;

713

if(debug){

714

fprintf_plus(stderr, "Falling back to security parameter"

715

" \"%s\"\n",

716

safe_string(gnutls_sec_param_get_name

717

(sec_param)));

718

}

719

}

720

}

721

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

722

if(uret != 0){

723

mc->dh_bits = uret;

724

if(debug){

725

fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"

726

" implies %u DH bits; using that.\n",

727

safe_string(gnutls_sec_param_get_name

728

(sec_param)),

729

mc->dh_bits);

730

}

731

} else {

732

fprintf_plus(stderr, "Failed to get implied number of DH"

733

" bits for security parameter \"%s\"): %s\n",

734

safe_string(gnutls_sec_param_get_name

735

(sec_param)),

736

safer_gnutls_strerror(ret));

737

goto globalfail;

738

}

739

} else if(debug){

740

fprintf_plus(stderr, "DH bits explicitly set to %u\n",

741

mc->dh_bits);

742

}

743

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

744

if(ret != GNUTLS_E_SUCCESS){

745

fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"

746

" bits): %s\n", mc->dh_bits,

747

safer_gnutls_strerror(ret));

748

goto globalfail;

749

}

750

}

751

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

453

ret = gnutls_dh_params_init(&mc.dh_params);

454

if(ret != GNUTLS_E_SUCCESS){

455

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

456

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

457

goto globalfail;

458

}

459

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

460

if(ret != GNUTLS_E_SUCCESS){

461

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

462

safer_gnutls_strerror(ret));

463

goto globalfail;

464

}

465

466

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

752

467

753

468

return 0;

754

469

755

470

globalfail:

756

471

757

gnutls_certificate_free_credentials(mc->cred);

472

gnutls_certificate_free_credentials(mc.cred);

758

473

gnutls_global_deinit();

759

gnutls_dh_params_deinit(mc->dh_params);

474

gnutls_dh_params_deinit(mc.dh_params);

760

475

return -1;

761

476

}

762

477

763

__attribute__((nonnull, warn_unused_result))

764

static int init_gnutls_session(gnutls_session_t *session,

765

mandos_context *mc){

478

static int init_gnutls_session(gnutls_session_t *session){

766

479

int ret;

767

480

/* GnuTLS session creation */

768

481

do {

772

485

}

773

486

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

774

487

if(ret != GNUTLS_E_SUCCESS){

775

fprintf_plus(stderr,

776

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

777

safer_gnutls_strerror(ret));

488

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

489

safer_gnutls_strerror(ret));

778

490

}

779

491

780

492

{

781

493

const char *err;

782

494

do {

783

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

495

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

784

496

if(quit_now){

785

497

gnutls_deinit(*session);

786

498

return -1;

787

499

}

788

500

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

789

501

if(ret != GNUTLS_E_SUCCESS){

790

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

791

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

792

safer_gnutls_strerror(ret));

502

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

503

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

504

safer_gnutls_strerror(ret));

793

505

gnutls_deinit(*session);

794

506

return -1;

795

507

}

797

509

798

510

do {

799

511

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

800

mc->cred);

512

mc.cred);

801

513

if(quit_now){

802

514

gnutls_deinit(*session);

803

515

return -1;

804

516

}

805

517

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

806

518

if(ret != GNUTLS_E_SUCCESS){

807

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

808

safer_gnutls_strerror(ret));

519

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

520

safer_gnutls_strerror(ret));

809

521

gnutls_deinit(*session);

810

522

return -1;

811

523

}

813

525

/* ignore client certificate if any. */

814

526

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

815

527

528

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

529

816

530

return 0;

817

531

}

818

532

820

534

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

821

535

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

822

536

823

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

824

__attribute__((warn_unused_result))

825

error_t raise_privileges(void){

826

error_t old_errno = errno;

827

error_t ret_errno = 0;

828

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

829

ret_errno = errno;

830

}

831

errno = old_errno;

832

return ret_errno;

833

}

834

835

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

836

__attribute__((warn_unused_result))

837

error_t raise_privileges_permanently(void){

838

error_t old_errno = errno;

839

error_t ret_errno = raise_privileges();

840

if(ret_errno != 0){

841

errno = old_errno;

842

return ret_errno;

843

}

844

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

845

ret_errno = errno;

846

}

847

errno = old_errno;

848

return ret_errno;

849

}

850

851

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

852

__attribute__((warn_unused_result))

853

error_t lower_privileges(void){

854

error_t old_errno = errno;

855

error_t ret_errno = 0;

856

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

857

ret_errno = errno;

858

}

859

errno = old_errno;

860

return ret_errno;

861

}

862

863

/* Lower privileges permanently */

864

__attribute__((warn_unused_result))

865

error_t lower_privileges_permanently(void){

866

error_t old_errno = errno;

867

error_t ret_errno = 0;

868

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

869

ret_errno = errno;

870

}

871

errno = old_errno;

872

return ret_errno;

873

}

874

875

/* Helper function to add_local_route() and delete_local_route() */

876

__attribute__((nonnull, warn_unused_result))

877

static bool add_delete_local_route(const bool add,

878

const char *address,

879

AvahiIfIndex if_index){

880

int ret;

881

char helper[] = "mandos-client-iprouteadddel";

882

char add_arg[] = "add";

883

char delete_arg[] = "delete";

884

char debug_flag[] = "--debug";

885

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

886

if(pluginhelperdir == NULL){

887

if(debug){

888

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

889

" variable not set; cannot run helper\n");

890

}

891

return false;

892

}

893

894

char interface[IF_NAMESIZE];

895

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

896

perror_plus("if_indextoname");

897

return false;

898

}

899

900

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

901

if(devnull == -1){

902

perror_plus("open(\"/dev/null\", O_RDONLY)");

903

return false;

904

}

905

pid_t pid = fork();

906

if(pid == 0){

907

/* Child */

908

/* Raise privileges */

909

errno = raise_privileges_permanently();

910

if(errno != 0){

911

perror_plus("Failed to raise privileges");

912

/* _exit(EX_NOPERM); */

913

} else {

914

/* Set group */

915

errno = 0;

916

ret = setgid(0);

917

if(ret == -1){

918

perror_plus("setgid");

919

_exit(EX_NOPERM);

920

}

921

/* Reset supplementary groups */

922

errno = 0;

923

ret = setgroups(0, NULL);

924

if(ret == -1){

925

perror_plus("setgroups");

926

_exit(EX_NOPERM);

927

}

928

}

929

ret = dup2(devnull, STDIN_FILENO);

930

if(ret == -1){

931

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

932

_exit(EX_OSERR);

933

}

934

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

935

if(ret == -1){

936

perror_plus("close");

937

_exit(EX_OSERR);

938

}

939

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

940

if(ret == -1){

941

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

942

_exit(EX_OSERR);

943

}

944

int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,

945

O_RDONLY

946

| O_DIRECTORY

947

| O_PATH

948

| O_CLOEXEC));

949

if(helperdir_fd == -1){

950

perror_plus("open");

951

_exit(EX_UNAVAILABLE);

952

}

953

int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,

954

helper, O_RDONLY));

955

if(helper_fd == -1){

956

perror_plus("openat");

957

_exit(EX_UNAVAILABLE);

958

}

959

TEMP_FAILURE_RETRY(close(helperdir_fd));

960

#ifdef __GNUC__

961

#pragma GCC diagnostic push

962

#pragma GCC diagnostic ignored "-Wcast-qual"

963

#endif

964

if(fexecve(helper_fd, (char *const [])

965

{ helper, add ? add_arg : delete_arg, (char *)address,

966

interface, debug ? debug_flag : NULL, NULL },

967

environ) == -1){

968

#ifdef __GNUC__

969

#pragma GCC diagnostic pop

970

#endif

971

perror_plus("fexecve");

972

_exit(EXIT_FAILURE);

973

}

974

}

975

if(pid == -1){

976

perror_plus("fork");

977

return false;

978

}

979

int status;

980

pid_t pret = -1;

981

errno = 0;

982

do {

983

pret = waitpid(pid, &status, 0);

984

if(pret == -1 and errno == EINTR and quit_now){

985

int errno_raising = 0;

986

if((errno = raise_privileges()) != 0){

987

errno_raising = errno;

988

perror_plus("Failed to raise privileges in order to"

989

" kill helper program");

990

}

991

if(kill(pid, SIGTERM) == -1){

992

perror_plus("kill");

993

}

994

if((errno_raising == 0) and (errno = lower_privileges()) != 0){

995

perror_plus("Failed to lower privileges after killing"

996

" helper program");

997

}

998

return false;

999

}

1000

} while(pret == -1 and errno == EINTR);

1001

if(pret == -1){

1002

perror_plus("waitpid");

1003

return false;

1004

}

1005

if(WIFEXITED(status)){

1006

if(WEXITSTATUS(status) != 0){

1007

fprintf_plus(stderr, "Error: iprouteadddel exited"

1008

" with status %d\n", WEXITSTATUS(status));

1009

return false;

1010

}

1011

return true;

1012

}

1013

if(WIFSIGNALED(status)){

1014

fprintf_plus(stderr, "Error: iprouteadddel died by"

1015

" signal %d\n", WTERMSIG(status));

1016

return false;

1017

}

1018

fprintf_plus(stderr, "Error: iprouteadddel crashed\n");

1019

return false;

1020

}

1021

1022

__attribute__((nonnull, warn_unused_result))

1023

static bool add_local_route(const char *address,

1024

AvahiIfIndex if_index){

1025

if(debug){

1026

fprintf_plus(stderr, "Adding route to %s\n", address);

1027

}

1028

return add_delete_local_route(true, address, if_index);

1029

}

1030

1031

__attribute__((nonnull, warn_unused_result))

1032

static bool delete_local_route(const char *address,

1033

AvahiIfIndex if_index){

1034

if(debug){

1035

fprintf_plus(stderr, "Removing route to %s\n", address);

1036

}

1037

return add_delete_local_route(false, address, if_index);

1038

}

1039

1040

537

/* Called when a Mandos server is found */

1041

__attribute__((nonnull, warn_unused_result))

1042

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

538

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

1043

539

AvahiIfIndex if_index,

1044

int af, mandos_context *mc){

540

int af){

1045

541

int ret, tcp_sd = -1;

1046

542

ssize_t sret;

1047

struct sockaddr_storage to;

543

union {

544

struct sockaddr_in in;

545

struct sockaddr_in6 in6;

546

} to;

1048

547

char *buffer = NULL;

1049

548

char *decrypted_buffer = NULL;

1050

549

size_t buffer_length = 0;

1053

552

int retval = -1;

1054

553

gnutls_session_t session;

1055

554

int pf; /* Protocol family */

1056

bool route_added = false;

1057

1058

errno = 0;

1059

555

1060

556

if(quit_now){

1061

errno = EINTR;

1062

557

return -1;

1063

558

}

1064

559

1070

565

pf = PF_INET;

1071

566

break;

1072

567

default:

1073

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

1074

errno = EINVAL;

568

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

1075

569

return -1;

1076

570

}

1077

571

1078

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

1079

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

1080

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

1081

bool match = false;

1082

{

1083

char *interface = NULL;

1084

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

1085

interface))){

1086

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

1087

match = true;

1088

break;

1089

}

1090

}

1091

}

1092

if(not match){

1093

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

1094

connect to the server */

1095

if(debug){

1096

char interface[IF_NAMESIZE];

1097

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

1098

perror_plus("if_indextoname");

1099

} else {

1100

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

1101

" \"%s\"\n",

1102

if_indextoname((unsigned int)if_index,

1103

interface));

1104

}

1105

}

1106

return -1;

1107

}

1108

}

1109

1110

ret = init_gnutls_session(&session, mc);

572

ret = init_gnutls_session(&session);

1111

573

if(ret != 0){

1112

574

return -1;

1113

575

}

1114

576

1115

577

if(debug){

1116

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

1117

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

578

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

579

"\n", ip, port);

1118

580

}

1119

581

1120

tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);

582

tcp_sd = socket(pf, SOCK_STREAM, 0);

1121

583

if(tcp_sd < 0){

1122

int e = errno;

1123

perror_plus("socket");

1124

errno = e;

584

perror("socket");

1125

585

goto mandos_end;

1126

586

}

1127

587

1128

588

if(quit_now){

1129

errno = EINTR;

1130

589

goto mandos_end;

1131

590

}

1132

591

1133

592

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

1134

593

if(af == AF_INET6){

1135

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

1136

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

594

to.in6.sin6_family = (sa_family_t)af;

595

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

1137

596

} else { /* IPv4 */

1138

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

1139

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

597

to.in.sin_family = (sa_family_t)af;

598

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

1140

599

}

1141

600

if(ret < 0 ){

1142

int e = errno;

1143

perror_plus("inet_pton");

1144

errno = e;

601

perror("inet_pton");

1145

602

goto mandos_end;

1146

603

}

1147

604

if(ret == 0){

1148

int e = errno;

1149

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

1150

errno = e;

605

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

1151

606

goto mandos_end;

1152

607

}

1153

608

if(af == AF_INET6){

1154

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

1155

if(IN6_IS_ADDR_LINKLOCAL

1156

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

609

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

610

-Wconversion and

611

-Wunreachable-code */

612

613

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

614

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

615

-Wunreachable-code*/

1157

616

if(if_index == AVAHI_IF_UNSPEC){

1158

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

1159

" incomplete without a network interface\n");

1160

errno = EINVAL;

617

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

618

" without a network interface\n");

1161

619

goto mandos_end;

1162

620

}

1163

621

/* Set the network interface number as scope */

1164

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

622

to.in6.sin6_scope_id = (uint32_t)if_index;

1165

623

}

1166

624

} else {

1167

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

625

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

626

-Wconversion and

627

-Wunreachable-code */

1168

628

}

1169

629

1170

630

if(quit_now){

1171

errno = EINTR;

1172

631

goto mandos_end;

1173

632

}

1174

633

1176

635

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

1177

636

char interface[IF_NAMESIZE];

1178

637

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

1179

perror_plus("if_indextoname");

638

perror("if_indextoname");

1180

639

} else {

1181

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

1182

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

640

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

641

ip, interface, port);

1183

642

}

1184

643

} else {

1185

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

1186

ip, (uintmax_t)port);

644

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

645

port);

1187

646

}

1188

647

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

1189

648

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

1190

if(af == AF_INET6){

1191

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

1192

sizeof(struct sockaddr_in6),

1193

addrstr, sizeof(addrstr), NULL, 0,

1194

NI_NUMERICHOST);

1195

} else {

1196

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

1197

sizeof(struct sockaddr_in),

1198

addrstr, sizeof(addrstr), NULL, 0,

1199

NI_NUMERICHOST);

1200

}

1201

if(ret == EAI_SYSTEM){

1202

perror_plus("getnameinfo");

1203

} else if(ret != 0) {

1204

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

1205

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

1206

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

1207

}

1208

}

1209

1210

if(quit_now){

1211

errno = EINTR;

1212

goto mandos_end;

1213

}

1214

1215

while(true){

1216

if(af == AF_INET6){

1217

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

1218

sizeof(struct sockaddr_in6));

1219

} else {

1220

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

1221

sizeof(struct sockaddr_in));

1222

}

1223

if(ret < 0){

1224

if(errno == ENETUNREACH

1225

and if_index != AVAHI_IF_UNSPEC

1226

and connect_to == NULL

1227

and not route_added and

1228

((af == AF_INET6 and not

1229

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1230

&to)->sin6_addr)))

1231

or (af == AF_INET and

1232

/* Not a a IPv4LL address */

1233

(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)

1234

& 0xFFFF0000L) != 0xA9FE0000L))){

1235

/* Work around Avahi bug - Avahi does not announce link-local

1236

addresses if it has a global address, so local hosts with

1237

*only* a link-local address (e.g. Mandos clients) cannot

1238

connect to a Mandos server announced by Avahi on a server

1239

host with a global address. Work around this by retrying

1240

with an explicit route added with the server's address.

1241

1242

Avahi bug reference:

1243

http://lists.freedesktop.org/archives/avahi/2010-February/001833.html

1244

https://bugs.debian.org/587961

1245

*/

1246

if(debug){

1247

fprintf_plus(stderr, "Mandos server unreachable, trying"

1248

" direct route\n");

1249

}

1250

int e = errno;

1251

route_added = add_local_route(ip, if_index);

1252

if(route_added){

1253

continue;

1254

}

1255

errno = e;

1256

}

1257

if(errno != ECONNREFUSED or debug){

1258

int e = errno;

1259

perror_plus("connect");

1260

errno = e;

1261

}

1262

goto mandos_end;

1263

}

1264

1265

if(quit_now){

1266

errno = EINTR;

1267

goto mandos_end;

1268

}

1269

break;

649

const char *pcret;

650

if(af == AF_INET6){

651

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

652

sizeof(addrstr));

653

} else {

654

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

655

sizeof(addrstr));

656

}

657

if(pcret == NULL){

658

perror("inet_ntop");

659

} else {

660

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

661

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

662

}

663

}

664

}

665

666

if(quit_now){

667

goto mandos_end;

668

}

669

670

if(af == AF_INET6){

671

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

672

} else {

673

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

674

}

675

if(ret < 0){

676

perror("connect");

677

goto mandos_end;

678

}

679

680

if(quit_now){

681

goto mandos_end;

1270

682

}

1271

683

1272

684

const char *out = mandos_protocol_version;

1274

686

while(true){

1275

687

size_t out_size = strlen(out);

1276

688

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

1277

out_size - written));

689

out_size - written));

1278

690

if(ret == -1){

1279

int e = errno;

1280

perror_plus("write");

1281

errno = e;

691

perror("write");

1282

692

goto mandos_end;

1283

693

}

1284

694

written += (size_t)ret;

1294

704

}

1295

705

1296

706

if(quit_now){

1297

errno = EINTR;

1298

707

goto mandos_end;

1299

708

}

1300

709

}

1301

710

1302

711

if(debug){

1303

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

712

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

1304

713

}

1305

714

1306

715

if(quit_now){

1307

errno = EINTR;

1308

716

goto mandos_end;

1309

717

}

1310

718

1311

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

1312

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

1313

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

1314

gnutls_transport_set_ptr(session,

1315

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

719

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

1316

720

1317

721

if(quit_now){

1318

errno = EINTR;

1319

722

goto mandos_end;

1320

723

}

1321

724

1322

725

do {

1323

726

ret = gnutls_handshake(session);

1324

727

if(quit_now){

1325

errno = EINTR;

1326

728

goto mandos_end;

1327

729

}

1328

730

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

1329

731

1330

732

if(ret != GNUTLS_E_SUCCESS){

1331

733

if(debug){

1332

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

734

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

1333

735

gnutls_perror(ret);

1334

736

}

1335

errno = EPROTO;

1336

737

goto mandos_end;

1337

738

}

1338

739

1339

740

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

1340

741

1341

742

if(debug){

1342

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

1343

" %s\n", ip);

743

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

744

ip);

1344

745

}

1345

746

1346

747

while(true){

1347

748

1348

749

if(quit_now){

1349

errno = EINTR;

1350

750

goto mandos_end;

1351

751

}

1352

752

1353

753

buffer_capacity = incbuffer(&buffer, buffer_length,

1354

buffer_capacity);

754

buffer_capacity);

1355

755

if(buffer_capacity == 0){

1356

int e = errno;

1357

perror_plus("incbuffer");

1358

errno = e;

756

perror("incbuffer");

1359

757

goto mandos_end;

1360

758

}

1361

759

1362

760

if(quit_now){

1363

errno = EINTR;

1364

761

goto mandos_end;

1365

762

}

1366

763

1379

776

ret = gnutls_handshake(session);

1380

777

1381

778

if(quit_now){

1382

errno = EINTR;

1383

779

goto mandos_end;

1384

780

}

1385

781

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

1386

782

if(ret < 0){

1387

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

1388

"***\n");

783

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

1389

784

gnutls_perror(ret);

1390

errno = EPROTO;

1391

785

goto mandos_end;

1392

786

}

1393

787

break;

1394

788

default:

1395

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

1396

" encrypted session with Mandos server\n");

789

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

790

" encrypted session with Mandos server\n");

1397

791

gnutls_bye(session, GNUTLS_SHUT_RDWR);

1398

errno = EIO;

1399

792

goto mandos_end;

1400

793

}

1401

794

} else {

1404

797

}

1405

798

1406

799

if(debug){

1407

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

800

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

1408

801

}

1409

802

1410

803

if(quit_now){

1411

errno = EINTR;

1412

804

goto mandos_end;

1413

805

}

1414

806

1415

807

do {

1416

808

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

1417

809

if(quit_now){

1418

errno = EINTR;

1419

810

goto mandos_end;

1420

811

}

1421

812

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

1422

813

1423

814

if(buffer_length > 0){

1424

815

ssize_t decrypted_buffer_size;

1425

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

1426

&decrypted_buffer, mc);

816

decrypted_buffer_size = pgp_packet_decrypt(buffer,

817

buffer_length,

818

&decrypted_buffer);

1427

819

if(decrypted_buffer_size >= 0){

1428

820

1429

821

written = 0;

1430

822

while(written < (size_t) decrypted_buffer_size){

1431

823

if(quit_now){

1432

errno = EINTR;

1433

824

goto mandos_end;

1434

825

}

1435

826

1437

828

(size_t)decrypted_buffer_size - written,

1438

829

stdout);

1439

830

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

1440

int e = errno;

1441

831

if(debug){

1442

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

1443

strerror(errno));

832

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

833

strerror(errno));

1444

834

}

1445

errno = e;

1446

835

goto mandos_end;

1447

836

}

1448

837

written += (size_t)ret;

1454

843

/* Shutdown procedure */

1455

844

1456

845

mandos_end:

1457

{

1458

if(route_added){

1459

if(not delete_local_route(ip, if_index)){

1460

fprintf_plus(stderr, "Failed to delete local route to %s on"

1461

" interface %d", ip, if_index);

1462

}

1463

}

1464

int e = errno;

1465

free(decrypted_buffer);

1466

free(buffer);

1467

if(tcp_sd >= 0){

1468

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

1469

}

1470

if(ret == -1){

1471

if(e == 0){

1472

e = errno;

1473

}

1474

perror_plus("close");

1475

}

1476

gnutls_deinit(session);

1477

errno = e;

1478

if(quit_now){

1479

errno = EINTR;

1480

retval = -1;

1481

}

846

free(decrypted_buffer);

847

free(buffer);

848

if(tcp_sd >= 0){

849

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

850

}

851

if(ret == -1){

852

perror("close");

853

}

854

gnutls_deinit(session);

855

if(quit_now){

856

retval = -1;

1482

857

}

1483

858

return retval;

1484

859

}

1485

860

1486

__attribute__((nonnull))

1487

861

static void resolve_callback(AvahiSServiceResolver *r,

1488

862

AvahiIfIndex interface,

1489

863

AvahiProtocol proto,

1497

871

AVAHI_GCC_UNUSED AvahiStringList *txt,

1498

872

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1499

873

flags,

1500

void *mc){

1501

if(r == NULL){

1502

return;

1503

}

874

AVAHI_GCC_UNUSED void* userdata){

875

assert(r);

1504

876

1505

877

/* Called whenever a service has been resolved successfully or

1506

878

timed out */

1507

879

1508

880

if(quit_now){

1509

avahi_s_service_resolver_free(r);

1510

881

return;

1511

882

}

1512

883

1513

884

switch(event){

1514

885

default:

1515

886

case AVAHI_RESOLVER_FAILURE:

1516

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

1517

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

1518

domain,

1519

avahi_strerror(avahi_server_errno

1520

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

887

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

888

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

889

avahi_strerror(avahi_server_errno(mc.server)));

1521

890

break;

1522

891

1523

892

case AVAHI_RESOLVER_FOUND:

1525

894

char ip[AVAHI_ADDRESS_STR_MAX];

1526

895

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

1527

896

if(debug){

1528

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

1529

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

1530

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

897

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

898

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

899

ip, (intmax_t)interface, port);

1531

900

}

1532

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

1533

interface,

1534

avahi_proto_to_af(proto),

1535

mc);

901

int ret = start_mandos_communication(ip, port, interface,

902

avahi_proto_to_af(proto));

1536

903

if(ret == 0){

1537

avahi_simple_poll_quit(simple_poll);

1538

} else {

1539

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

1540

avahi_proto_to_af(proto),

1541

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

1542

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

1543

" list\n", name);

1544

}

904

avahi_simple_poll_quit(mc.simple_poll);

1545

905

}

1546

906

}

1547

907

}

1557

917

const char *domain,

1558

918

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1559

919

flags,

1560

void *mc){

1561

if(b == NULL){

1562

return;

1563

}

920

AVAHI_GCC_UNUSED void* userdata){

921

assert(b);

1564

922

1565

923

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

1566

924

is removed from the LAN */

1573

931

default:

1574

932

case AVAHI_BROWSER_FAILURE:

1575

933

1576

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

1577

avahi_strerror(avahi_server_errno

1578

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

1579

avahi_simple_poll_quit(simple_poll);

934

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

935

avahi_strerror(avahi_server_errno(mc.server)));

936

avahi_simple_poll_quit(mc.simple_poll);

1580

937

return;

1581

938

1582

939

case AVAHI_BROWSER_NEW:

1585

942

the callback function is called the Avahi server will free the

1586

943

resolver for us. */

1587

944

1588

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

1589

interface, protocol, name, type,

1590

domain, protocol, 0,

1591

resolve_callback, mc) == NULL)

1592

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

1593

" %s\n", name,

1594

avahi_strerror(avahi_server_errno

1595

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

945

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

946

name, type, domain, protocol, 0,

947

resolve_callback, NULL) == NULL)

948

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

949

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

1596

950

break;

1597

951

1598

952

case AVAHI_BROWSER_REMOVE:

1601

955

case AVAHI_BROWSER_ALL_FOR_NOW:

1602

956

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1603

957

if(debug){

1604

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

1605

" searching...\n");

958

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

1606

959

}

1607

960

break;

1608

961

}

1609

962

}

1610

963

1611

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

964

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

1612

965

static void handle_sigterm(int sig){

1613

966

if(quit_now){

1614

967

return;

1616

969

quit_now = 1;

1617

970

signal_received = sig;

1618

971

int old_errno = errno;

1619

/* set main loop to exit */

1620

if(simple_poll != NULL){

1621

avahi_simple_poll_quit(simple_poll);

1622

}

1623

errno = old_errno;

1624

}

1625

1626

__attribute__((nonnull, warn_unused_result))

1627

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

1628

int ret;

1629

error_t ret_errno;

1630

1631

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

1632

if(s < 0){

1633

ret_errno = errno;

1634

perror_plus("socket");

1635

errno = ret_errno;

1636

return false;

1637

}

1638

strcpy(ifr->ifr_name, ifname);

1639

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1640

if(ret == -1){

1641

if(debug){

1642

ret_errno = errno;

1643

perror_plus("ioctl SIOCGIFFLAGS");

1644

errno = ret_errno;

1645

}

1646

return false;

1647

}

1648

return true;

1649

}

1650

1651

__attribute__((nonnull, warn_unused_result))

1652

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

1653

1654

/* Reject the loopback device */

1655

if(ifr->ifr_flags & IFF_LOOPBACK){

1656

if(debug){

1657

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

1658

ifname);

1659

}

1660

return false;

1661

}

1662

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

1663

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

1664

if(debug){

1665

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

1666

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

1667

}

1668

return true;

1669

}

1670

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

1671

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

1672

if(debug){

1673

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1674

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

1675

}

1676

return false;

1677

}

1678

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

1679

if(ifr->ifr_flags & IFF_NOARP){

1680

if(debug){

1681

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

1682

ifname);

1683

}

1684

return false;

1685

}

1686

1687

/* Accept this device */

1688

if(debug){

1689

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

1690

}

1691

return true;

1692

}

1693

1694

/*

1695

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

1696

* corresponds to an acceptable network device.

1697

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

1698

*/

1699

__attribute__((nonnull, warn_unused_result))

1700

int good_interface(const struct dirent *if_entry){

1701

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

1702

return 0;

1703

}

1704

1705

struct ifreq ifr;

1706

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

1707

if(debug){

1708

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

1709

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

1710

}

1711

return 0;

1712

}

1713

1714

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

1715

return 0;

1716

}

1717

return 1;

1718

}

1719

1720

/*

1721

* This function determines if a network interface is up.

1722

*/

1723

__attribute__((nonnull, warn_unused_result))

1724

bool interface_is_up(const char *interface){

1725

struct ifreq ifr;

1726

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

1727

if(debug){

1728

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

1729

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

1730

}

1731

return false;

1732

}

1733

1734

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

1735

}

1736

1737

/*

1738

* This function determines if a network interface is running

1739

*/

1740

__attribute__((nonnull, warn_unused_result))

1741

bool interface_is_running(const char *interface){

1742

struct ifreq ifr;

1743

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

1744

if(debug){

1745

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

1746

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

1747

}

1748

return false;

1749

}

1750

1751

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

1752

}

1753

1754

__attribute__((nonnull, pure, warn_unused_result))

1755

int notdotentries(const struct dirent *direntry){

1756

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

1757

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

1758

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

1759

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

1760

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

1761

return 0;

1762

}

1763

return 1;

1764

}

1765

1766

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

1767

__attribute__((nonnull, warn_unused_result))

1768

int runnable_hook(const struct dirent *direntry){

1769

int ret;

1770

size_t sret;

1771

struct stat st;

1772

1773

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

1774

/* Empty name? */

1775

return 0;

1776

}

1777

1778

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

1779

"abcdefghijklmnopqrstuvwxyz"

1780

"0123456789"

1781

"_.-");

1782

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

1783

/* Contains non-allowed characters */

1784

if(debug){

1785

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

1786

direntry->d_name);

1787

}

1788

return 0;

1789

}

1790

1791

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

1792

if(ret == -1){

1793

if(debug){

1794

perror_plus("Could not stat hook");

1795

}

1796

return 0;

1797

}

1798

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

1799

/* Not a regular file */

1800

if(debug){

1801

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

1802

direntry->d_name);

1803

}

1804

return 0;

1805

}

1806

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

1807

/* Not executable */

1808

if(debug){

1809

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

1810

direntry->d_name);

1811

}

1812

return 0;

1813

}

1814

if(debug){

1815

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

1816

direntry->d_name);

1817

}

1818

return 1;

1819

}

1820

1821

__attribute__((nonnull, warn_unused_result))

1822

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1823

mandos_context *mc){

1824

int ret;

1825

struct timespec now;

1826

struct timespec waited_time;

1827

intmax_t block_time;

1828

1829

while(true){

1830

if(mc->current_server == NULL){

1831

if(debug){

1832

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

1833

" No timeout!\n");

1834

}

1835

ret = avahi_simple_poll_iterate(s, -1);

1836

} else {

1837

if(debug){

1838

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

1839

" it, or wait\n");

1840

}

1841

/* the current time */

1842

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1843

if(ret == -1){

1844

perror_plus("clock_gettime");

1845

return -1;

1846

}

1847

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

1848

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

1849

waited_time.tv_sec = (now.tv_sec

1850

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

1851

waited_time.tv_nsec = (now.tv_nsec

1852

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

1853

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

1854

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

1855

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

1856

block_time = ((retry_interval

1857

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

1858

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

1859

1860

if(debug){

1861

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

1862

block_time);

1863

}

1864

1865

if(block_time <= 0){

1866

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

1867

mc->current_server->port,

1868

mc->current_server->if_index,

1869

mc->current_server->af, mc);

1870

if(ret == 0){

1871

avahi_simple_poll_quit(s);

1872

return 0;

1873

}

1874

ret = clock_gettime(CLOCK_MONOTONIC,

1875

&mc->current_server->last_seen);

1876

if(ret == -1){

1877

perror_plus("clock_gettime");

1878

return -1;

1879

}

1880

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

1881

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

1882

servers, but don't block */

1883

}

1884

1885

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

1886

}

1887

if(ret != 0){

1888

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

1889

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

1890

}

1891

}

1892

}

1893

}

1894

1895

__attribute__((nonnull))

1896

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

1897

const float delay){

1898

struct dirent **direntries = NULL;

1899

if(hookdir_fd == -1){

1900

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1901

| O_CLOEXEC);

1902

if(hookdir_fd == -1){

1903

if(errno == ENOENT){

1904

if(debug){

1905

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

1906

" found\n", hookdir);

1907

}

1908

} else {

1909

perror_plus("open");

1910

}

1911

return;

1912

}

1913

}

1914

#ifdef __GLIBC__

1915

#if __GLIBC_PREREQ(2, 15)

1916

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

1917

runnable_hook, alphasort);

1918

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

1919

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

1920

alphasort);

1921

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

1922

#else /* not __GLIBC__ */

1923

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

1924

alphasort);

1925

#endif /* not __GLIBC__ */

1926

if(numhooks == -1){

1927

perror_plus("scandir");

1928

return;

1929

}

1930

struct dirent *direntry;

1931

int ret;

1932

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

1933

if(devnull == -1){

1934

perror_plus("open(\"/dev/null\", O_RDONLY)");

1935

return;

1936

}

1937

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

1938

direntry = direntries[i];

1939

if(debug){

1940

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

1941

direntry->d_name);

1942

}

1943

pid_t hook_pid = fork();

1944

if(hook_pid == 0){

1945

/* Child */

1946

/* Raise privileges */

1947

errno = raise_privileges_permanently();

1948

if(errno != 0){

1949

perror_plus("Failed to raise privileges");

1950

_exit(EX_NOPERM);

1951

}

1952

/* Set group */

1953

errno = 0;

1954

ret = setgid(0);

1955

if(ret == -1){

1956

perror_plus("setgid");

1957

_exit(EX_NOPERM);

1958

}

1959

/* Reset supplementary groups */

1960

errno = 0;

1961

ret = setgroups(0, NULL);

1962

if(ret == -1){

1963

perror_plus("setgroups");

1964

_exit(EX_NOPERM);

1965

}

1966

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

1967

if(ret == -1){

1968

perror_plus("setenv");

1969

_exit(EX_OSERR);

1970

}

1971

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

1972

if(ret == -1){

1973

perror_plus("setenv");

1974

_exit(EX_OSERR);

1975

}

1976

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

1977

if(ret == -1){

1978

perror_plus("setenv");

1979

_exit(EX_OSERR);

1980

}

1981

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

1982

if(ret == -1){

1983

perror_plus("setenv");

1984

_exit(EX_OSERR);

1985

}

1986

char *delaystring;

1987

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

1988

if(ret == -1){

1989

perror_plus("asprintf");

1990

_exit(EX_OSERR);

1991

}

1992

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

1993

if(ret == -1){

1994

free(delaystring);

1995

perror_plus("setenv");

1996

_exit(EX_OSERR);

1997

}

1998

free(delaystring);

1999

if(connect_to != NULL){

2000

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

2001

if(ret == -1){

2002

perror_plus("setenv");

2003

_exit(EX_OSERR);

2004

}

2005

}

2006

int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,

2007

direntry->d_name,

2008

O_RDONLY));

2009

if(hook_fd == -1){

2010

perror_plus("openat");

2011

_exit(EXIT_FAILURE);

2012

}

2013

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

2014

perror_plus("close");

2015

_exit(EXIT_FAILURE);

2016

}

2017

ret = dup2(devnull, STDIN_FILENO);

2018

if(ret == -1){

2019

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

2020

_exit(EX_OSERR);

2021

}

2022

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

2023

if(ret == -1){

2024

perror_plus("close");

2025

_exit(EX_OSERR);

2026

}

2027

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2028

if(ret == -1){

2029

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

2030

_exit(EX_OSERR);

2031

}

2032

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

2033

environ) == -1){

2034

perror_plus("fexecve");

2035

_exit(EXIT_FAILURE);

2036

}

2037

} else {

2038

if(hook_pid == -1){

2039

perror_plus("fork");

2040

free(direntry);

2041

continue;

2042

}

2043

int status;

2044

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

2045

perror_plus("waitpid");

2046

free(direntry);

2047

continue;

2048

}

2049

if(WIFEXITED(status)){

2050

if(WEXITSTATUS(status) != 0){

2051

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

2052

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

2053

WEXITSTATUS(status));

2054

free(direntry);

2055

continue;

2056

}

2057

} else if(WIFSIGNALED(status)){

2058

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

2059

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

2060

WTERMSIG(status));

2061

free(direntry);

2062

continue;

2063

} else {

2064

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

2065

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

2066

free(direntry);

2067

continue;

2068

}

2069

}

2070

if(debug){

2071

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

2072

direntry->d_name);

2073

}

2074

free(direntry);

2075

}

2076

free(direntries);

2077

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

2078

perror_plus("close");

2079

} else {

2080

hookdir_fd = -1;

2081

}

2082

close(devnull);

2083

}

2084

2085

__attribute__((nonnull, warn_unused_result))

2086

error_t bring_up_interface(const char *const interface,

2087

const float delay){

2088

error_t old_errno = errno;

2089

int ret;

2090

struct ifreq network;

2091

unsigned int if_index = if_nametoindex(interface);

2092

if(if_index == 0){

2093

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

2094

errno = old_errno;

2095

return ENXIO;

2096

}

2097

2098

if(quit_now){

2099

errno = old_errno;

2100

return EINTR;

2101

}

2102

2103

if(not interface_is_up(interface)){

2104

error_t ret_errno = 0, ioctl_errno = 0;

2105

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

2106

ret_errno = errno;

2107

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

2108

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

2109

errno = old_errno;

2110

return ret_errno;

2111

}

2112

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

2113

2114

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

2115

if(sd == -1){

2116

ret_errno = errno;

2117

perror_plus("socket");

2118

errno = old_errno;

2119

return ret_errno;

2120

}

2121

2122

if(quit_now){

2123

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

2124

if(ret == -1){

2125

perror_plus("close");

2126

}

2127

errno = old_errno;

2128

return EINTR;

2129

}

2130

2131

if(debug){

2132

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

2133

interface);

2134

}

2135

2136

/* Raise privileges */

2137

ret_errno = raise_privileges();

2138

if(ret_errno != 0){

2139

errno = ret_errno;

2140

perror_plus("Failed to raise privileges");

2141

}

2142

2143

#ifdef __linux__

2144

int ret_linux;

2145

bool restore_loglevel = false;

2146

if(ret_errno == 0){

2147

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2148

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

2149

ret_linux = klogctl(8, NULL, 5);

2150

if(ret_linux == -1){

2151

perror_plus("klogctl");

2152

} else {

2153

restore_loglevel = true;

2154

}

2155

}

2156

#endif /* __linux__ */

2157

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

2158

ioctl_errno = errno;

2159

#ifdef __linux__

2160

if(restore_loglevel){

2161

ret_linux = klogctl(7, NULL, 0);

2162

if(ret_linux == -1){

2163

perror_plus("klogctl");

2164

}

2165

}

2166

#endif /* __linux__ */

2167

2168

/* If raise_privileges() succeeded above */

2169

if(ret_errno == 0){

2170

/* Lower privileges */

2171

ret_errno = lower_privileges();

2172

if(ret_errno != 0){

2173

errno = ret_errno;

2174

perror_plus("Failed to lower privileges");

2175

}

2176

}

2177

2178

/* Close the socket */

2179

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

2180

if(ret == -1){

2181

perror_plus("close");

2182

}

2183

2184

if(ret_setflags == -1){

2185

errno = ioctl_errno;

2186

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2187

errno = old_errno;

2188

return ioctl_errno;

2189

}

2190

} else if(debug){

2191

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

2192

interface);

2193

}

2194

2195

/* Sleep checking until interface is running.

2196

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

2197

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

2198

if(interface_is_running(interface)){

2199

break;

2200

}

2201

struct timespec sleeptime = { .tv_nsec = 250000000 };

2202

ret = nanosleep(&sleeptime, NULL);

2203

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

2204

perror_plus("nanosleep");

2205

}

2206

}

2207

2208

errno = old_errno;

2209

return 0;

2210

}

2211

2212

__attribute__((nonnull, warn_unused_result))

2213

error_t take_down_interface(const char *const interface){

2214

error_t old_errno = errno;

2215

struct ifreq network;

2216

unsigned int if_index = if_nametoindex(interface);

2217

if(if_index == 0){

2218

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

2219

errno = old_errno;

2220

return ENXIO;

2221

}

2222

if(interface_is_up(interface)){

2223

error_t ret_errno = 0, ioctl_errno = 0;

2224

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

2225

ret_errno = errno;

2226

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

2227

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

2228

errno = old_errno;

2229

return ret_errno;

2230

}

2231

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

2232

2233

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

2234

if(sd == -1){

2235

ret_errno = errno;

2236

perror_plus("socket");

2237

errno = old_errno;

2238

return ret_errno;

2239

}

2240

2241

if(debug){

2242

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

2243

interface);

2244

}

2245

2246

/* Raise privileges */

2247

ret_errno = raise_privileges();

2248

if(ret_errno != 0){

2249

errno = ret_errno;

2250

perror_plus("Failed to raise privileges");

2251

}

2252

2253

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

2254

ioctl_errno = errno;

2255

2256

/* If raise_privileges() succeeded above */

2257

if(ret_errno == 0){

2258

/* Lower privileges */

2259

ret_errno = lower_privileges();

2260

if(ret_errno != 0){

2261

errno = ret_errno;

2262

perror_plus("Failed to lower privileges");

2263

}

2264

}

2265

2266

/* Close the socket */

2267

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

2268

if(ret == -1){

2269

perror_plus("close");

2270

}

2271

2272

if(ret_setflags == -1){

2273

errno = ioctl_errno;

2274

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2275

errno = old_errno;

2276

return ioctl_errno;

2277

}

2278

} else if(debug){

2279

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

2280

interface);

2281

}

2282

2283

errno = old_errno;

2284

return 0;

972

if(mc.simple_poll != NULL){

973

avahi_simple_poll_quit(mc.simple_poll);

974

}

975

errno = old_errno;

2285

976

}

2286

977

2287

978

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

2288

mandos_context mc = { .server = NULL, .dh_bits = 0,

2289

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

2290

"+CTYPE-OPENPGP:!RSA", .current_server = NULL,

2291

.interfaces = NULL, .interfaces_size = 0 };

2292

979

AvahiSServiceBrowser *sb = NULL;

2293

error_t ret_errno;

980

int error;

2294

981

int ret;

2295

982

intmax_t tmpmax;

2296

983

char *tmp;

2297

984

int exitcode = EXIT_SUCCESS;

2298

char *interfaces_to_take_down = NULL;

2299

size_t interfaces_to_take_down_size = 0;

2300

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

2301

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

2302

char *tempdir = NULL;

985

const char *interface = "eth0";

986

struct ifreq network;

987

int sd = -1;

988

bool take_down_interface = false;

989

uid_t uid;

990

gid_t gid;

991

char *connect_to = NULL;

992

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

993

bool tempdir_created = false;

2303

994

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2304

995

const char *seckey = PATHDIR "/" SECKEY;

2305

996

const char *pubkey = PATHDIR "/" PUBKEY;

2306

const char *dh_params_file = NULL;

2307

char *interfaces_hooks = NULL;

2308

997

2309

998

bool gnutls_initialized = false;

2310

999

bool gpgme_initialized = false;

2311

1000

float delay = 2.5f;

2312

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

2313

retrying the same server again */

2314

1001

2315

1002

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

2316

1003

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

2322

1009

errno = 0;

2323

1010

ret = setgid(gid);

2324

1011

if(ret == -1){

2325

perror_plus("setgid");

1012

perror("setgid");

2326

1013

}

2327

1014

2328

1015

/* Lower user privileges (temporarily) */

2329

1016

errno = 0;

2330

1017

ret = seteuid(uid);

2331

1018

if(ret == -1){

2332

perror_plus("seteuid");

1019

perror("seteuid");

2333

1020

}

2334

1021

2335

1022

if(quit_now){

2362

1049

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

2363

1050

" Diffie-Hellman key exchange",

2364

1051

.group = 2 },

2365

{ .name = "dh-params", .key = 134,

2366

.arg = "FILE",

2367

.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"

2368

" for the Diffie-Hellman key exchange",

2369

.group = 2 },

2370

1052

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

2371

1053

.arg = "STRING",

2372

1054

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

2375

1057

.arg = "SECONDS",

2376

1058

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

2377

1059

.group = 2 },

2378

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

2379

.arg = "SECONDS",

2380

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

2381

.group = 2 },

2382

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

2383

.arg = "DIR",

2384

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

2385

.group = 2 },

2386

1060

/*

2387

1061

* These reproduce what we would get without ARGP_NO_HELP

2388

1062

*/

2406

1080

connect_to = arg;

2407

1081

break;

2408

1082

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

2409

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

2410

arg, (int)',');

2411

if(ret_errno != 0){

2412

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

2413

}

1083

interface = arg;

2414

1084

break;

2415

1085

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

2416

1086

seckey = arg;

2427

1097

}

2428

1098

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

2429

1099

break;

2430

case 134: /* --dh-params */

2431

dh_params_file = arg;

2432

break;

2433

1100

case 130: /* --priority */

2434

1101

mc.priority = arg;

2435

1102

break;

2439

1106

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

2440

1107

argp_error(state, "Bad delay");

2441

1108

}

2442

case 132: /* --retry */

2443

errno = 0;

2444

retry_interval = strtod(arg, &tmp);

2445

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

2446

or (retry_interval * 1000) > INT_MAX

2447

or retry_interval < 0){

2448

argp_error(state, "Bad retry interval");

2449

}

2450

break;

2451

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

2452

hookdir = arg;

2453

1109

break;

2454

1110

/*

2455

1111

* These reproduce what we would get without ARGP_NO_HELP

2462

1118

argp_state_help(state, state->out_stream,

2463

1119

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

2464

1120

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

2465

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

1121

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

2466

1122

exit(argp_err_exit_status);

2467

1123

break;

2468

1124

default:

2483

1139

case ENOMEM:

2484

1140

default:

2485

1141

errno = ret;

2486

perror_plus("argp_parse");

1142

perror("argp_parse");

2487

1143

exitcode = EX_OSERR;

2488

1144

goto end;

2489

1145

case EINVAL:

2492

1148

}

2493

1149

}

2494

1150

2495

{

2496

/* Work around Debian bug #633582:

2497

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

2498

2499

/* Re-raise privileges */

2500

ret_errno = raise_privileges();

2501

if(ret_errno != 0){

2502

errno = ret_errno;

2503

perror_plus("Failed to raise privileges");

2504

} else {

2505

struct stat st;

2506

2507

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

2508

int seckey_fd = open(seckey, O_RDONLY);

2509

if(seckey_fd == -1){

2510

perror_plus("open");

2511

} else {

2512

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

2513

if(ret == -1){

2514

perror_plus("fstat");

2515

} else {

2516

if(S_ISREG(st.st_mode)

2517

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

2518

ret = fchown(seckey_fd, uid, gid);

2519

if(ret == -1){

2520

perror_plus("fchown");

2521

}

2522

}

2523

}

2524

TEMP_FAILURE_RETRY(close(seckey_fd));

2525

}

2526

}

2527

2528

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

2529

int pubkey_fd = open(pubkey, O_RDONLY);

2530

if(pubkey_fd == -1){

2531

perror_plus("open");

2532

} else {

2533

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

2534

if(ret == -1){

2535

perror_plus("fstat");

2536

} else {

2537

if(S_ISREG(st.st_mode)

2538

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

2539

ret = fchown(pubkey_fd, uid, gid);

2540

if(ret == -1){

2541

perror_plus("fchown");

2542

}

2543

}

2544

}

2545

TEMP_FAILURE_RETRY(close(pubkey_fd));

2546

}

2547

}

2548

2549

/* Lower privileges */

2550

ret_errno = lower_privileges();

2551

if(ret_errno != 0){

2552

errno = ret_errno;

2553

perror_plus("Failed to lower privileges");

2554

}

2555

}

2556

}

2557

2558

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

2559

{

2560

char *interface = NULL;

2561

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

2562

interface))){

2563

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

2564

and if_nametoindex(interface) == 0){

2565

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

2566

fprintf_plus(stderr, "Not using nonexisting interface"

2567

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

2568

}

2569

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

2570

interface = NULL;

2571

}

2572

}

2573

}

2574

2575

/* Run network hooks */

2576

{

2577

if(mc.interfaces != NULL){

2578

interfaces_hooks = malloc(mc.interfaces_size);

2579

if(interfaces_hooks == NULL){

2580

perror_plus("malloc");

2581

goto end;

2582

}

2583

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

2584

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

2585

}

2586

run_network_hooks("start", interfaces_hooks != NULL ?

2587

interfaces_hooks : "", delay);

2588

}

2589

2590

1151

if(not debug){

2591

1152

avahi_set_log_function(empty_log);

2592

1153

}

2595

1156

from the signal handler */

2596

1157

/* Initialize the pseudo-RNG for Avahi */

2597

1158

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

2598

simple_poll = avahi_simple_poll_new();

2599

if(simple_poll == NULL){

2600

fprintf_plus(stderr,

2601

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

2602

exitcode = EX_UNAVAILABLE;

1159

mc.simple_poll = avahi_simple_poll_new();

1160

if(mc.simple_poll == NULL){

1161

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

1162

exitcode = EXIT_FAILURE;

2603

1163

goto end;

2604

1164

}

2605

1165

2606

1166

sigemptyset(&sigterm_action.sa_mask);

2607

1167

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

2608

1168

if(ret == -1){

2609

perror_plus("sigaddset");

2610

exitcode = EX_OSERR;

1169

perror("sigaddset");

1170

exitcode = EXIT_FAILURE;

2611

1171

goto end;

2612

1172

}

2613

1173

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

2614

1174

if(ret == -1){

2615

perror_plus("sigaddset");

2616

exitcode = EX_OSERR;

1175

perror("sigaddset");

1176

exitcode = EXIT_FAILURE;

2617

1177

goto end;

2618

1178

}

2619

1179

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

2620

1180

if(ret == -1){

2621

perror_plus("sigaddset");

2622

exitcode = EX_OSERR;

1181

perror("sigaddset");

1182

exitcode = EXIT_FAILURE;

2623

1183

goto end;

2624

1184

}

2625

1185

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

2628

1188

*/

2629

1189

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

2630

1190

if(ret == -1){

2631

perror_plus("sigaction");

2632

return EX_OSERR;

1191

perror("sigaction");

1192

return EXIT_FAILURE;

2633

1193

}

2634

1194

if(old_sigterm_action.sa_handler != SIG_IGN){

2635

1195

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

2636

1196

if(ret == -1){

2637

perror_plus("sigaction");

2638

exitcode = EX_OSERR;

1197

perror("sigaction");

1198

exitcode = EXIT_FAILURE;

2639

1199

goto end;

2640

1200

}

2641

1201

}

2642

1202

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

2643

1203

if(ret == -1){

2644

perror_plus("sigaction");

2645

return EX_OSERR;

1204

perror("sigaction");

1205

return EXIT_FAILURE;

2646

1206

}

2647

1207

if(old_sigterm_action.sa_handler != SIG_IGN){

2648

1208

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

2649

1209

if(ret == -1){

2650

perror_plus("sigaction");

2651

exitcode = EX_OSERR;

1210

perror("sigaction");

1211

exitcode = EXIT_FAILURE;

2652

1212

goto end;

2653

1213

}

2654

1214

}

2655

1215

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

2656

1216

if(ret == -1){

2657

perror_plus("sigaction");

2658

return EX_OSERR;

1217

perror("sigaction");

1218

return EXIT_FAILURE;

2659

1219

}

2660

1220

if(old_sigterm_action.sa_handler != SIG_IGN){

2661

1221

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

2662

1222

if(ret == -1){

2663

perror_plus("sigaction");

2664

exitcode = EX_OSERR;

1223

perror("sigaction");

1224

exitcode = EXIT_FAILURE;

2665

1225

goto end;

2666

1226

}

2667

1227

}

2668

1228

2669

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

2670

if(mc.interfaces == NULL){

2671

struct dirent **direntries = NULL;

2672

/* Look for any good interfaces */

2673

ret = scandir(sys_class_net, &direntries, good_interface,

2674

alphasort);

2675

if(ret >= 1){

2676

/* Add all found interfaces to interfaces list */

2677

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

2678

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

2679

direntries[i]->d_name);

2680

if(ret_errno != 0){

2681

errno = ret_errno;

2682

perror_plus("argz_add");

2683

free(direntries[i]);

2684

continue;

2685

}

2686

if(debug){

2687

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

2688

direntries[i]->d_name);

2689

}

2690

free(direntries[i]);

2691

}

2692

free(direntries);

1229

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

1230

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

1231

if_index = (AvahiIfIndex) if_nametoindex(interface);

1232

if(if_index == 0){

1233

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

1234

exitcode = EXIT_FAILURE;

1235

goto end;

1236

}

1237

1238

if(quit_now){

1239

goto end;

1240

}

1241

1242

/* Re-raise priviliges */

1243

errno = 0;

1244

ret = seteuid(0);

1245

if(ret == -1){

1246

perror("seteuid");

1247

}

1248

1249

#ifdef __linux__

1250

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1251

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

1252

ret = klogctl(8, NULL, 5);

1253

bool restore_loglevel = true;

1254

if(ret == -1){

1255

restore_loglevel = false;

1256

perror("klogctl");

1257

}

1258

#endif /* __linux__ */

1259

1260

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1261

if(sd < 0){

1262

perror("socket");

1263

exitcode = EXIT_FAILURE;

1264

#ifdef __linux__

1265

if(restore_loglevel){

1266

ret = klogctl(7, NULL, 0);

1267

if(ret == -1){

1268

perror("klogctl");

1269

}

1270

}

1271

#endif /* __linux__ */

1272

/* Lower privileges */

1273

errno = 0;

1274

ret = seteuid(uid);

1275

if(ret == -1){

1276

perror("seteuid");

1277

}

1278

goto end;

1279

}

1280

strcpy(network.ifr_name, interface);

1281

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

1282

if(ret == -1){

1283

perror("ioctl SIOCGIFFLAGS");

1284

#ifdef __linux__

1285

if(restore_loglevel){

1286

ret = klogctl(7, NULL, 0);

1287

if(ret == -1){

1288

perror("klogctl");

1289

}

1290

}

1291

#endif /* __linux__ */

1292

exitcode = EXIT_FAILURE;

1293

/* Lower privileges */

1294

errno = 0;

1295

ret = seteuid(uid);

1296

if(ret == -1){

1297

perror("seteuid");

1298

}

1299

goto end;

1300

}

1301

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

1302

network.ifr_flags |= IFF_UP;

1303

take_down_interface = true;

1304

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

1305

if(ret == -1){

1306

take_down_interface = false;

1307

perror("ioctl SIOCSIFFLAGS");

1308

exitcode = EXIT_FAILURE;

1309

#ifdef __linux__

1310

if(restore_loglevel){

1311

ret = klogctl(7, NULL, 0);

1312

if(ret == -1){

1313

perror("klogctl");

1314

}

1315

}

1316

#endif /* __linux__ */

1317

/* Lower privileges */

1318

errno = 0;

1319

ret = seteuid(uid);

1320

if(ret == -1){

1321

perror("seteuid");

1322

}

1323

goto end;

1324

}

1325

}

1326

/* sleep checking until interface is running */

1327

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

1328

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

1329

if(ret == -1){

1330

perror("ioctl SIOCGIFFLAGS");

1331

} else if(network.ifr_flags & IFF_RUNNING){

1332

break;

1333

}

1334

struct timespec sleeptime = { .tv_nsec = 250000000 };

1335

ret = nanosleep(&sleeptime, NULL);

1336

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

1337

perror("nanosleep");

1338

}

1339

}

1340

if(not take_down_interface){

1341

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

1342

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

1343

if(ret == -1){

1344

perror("close");

1345

}

1346

}

1347

#ifdef __linux__

1348

if(restore_loglevel){

1349

/* Restores kernel loglevel to default */

1350

ret = klogctl(7, NULL, 0);

1351

if(ret == -1){

1352

perror("klogctl");

1353

}

1354

}

1355

#endif /* __linux__ */

1356

/* Lower privileges */

1357

errno = 0;

1358

if(take_down_interface){

1359

/* Lower privileges */

1360

ret = seteuid(uid);

1361

if(ret == -1){

1362

perror("seteuid");

1363

}

2693

1364

} else {

2694

if(ret == 0){

2695

free(direntries);

2696

}

2697

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

2698

exitcode = EXIT_FAILURE;

2699

goto end;

2700

}

2701

}

2702

2703

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

2704

{

2705

char *interface = NULL;

2706

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

2707

interface))){

2708

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

2709

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

2710

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

2711

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

2712

interface);

2713

interface = NULL;

2714

while((interface = argz_next(mc.interfaces,

2715

mc.interfaces_size, interface))){

2716

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

2717

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

2718

interface);

2719

interface = NULL;

2720

}

2721

}

2722

break;

2723

}

2724

bool interface_was_up = interface_is_up(interface);

2725

errno = bring_up_interface(interface, delay);

2726

if(not interface_was_up){

2727

if(errno != 0){

2728

perror_plus("Failed to bring up interface");

2729

} else {

2730

errno = argz_add(&interfaces_to_take_down,

2731

&interfaces_to_take_down_size,

2732

interface);

2733

if(errno != 0){

2734

perror_plus("argz_add");

2735

}

2736

}

2737

}

2738

}

2739

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

2740

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

2741

}

2742

}

2743

2744

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

2745

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

2746

if(debug){

2747

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

2748

mc.interfaces);

2749

}

2750

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

1365

/* Lower privileges permanently */

1366

ret = setuid(uid);

1367

if(ret == -1){

1368

perror("setuid");

1369

}

1370

}

2751

1371

}

2752

1372

2753

1373

if(quit_now){

2754

1374

goto end;

2755

1375

}

2756

1376

2757

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

1377

ret = init_gnutls_global(pubkey, seckey);

2758

1378

if(ret == -1){

2759

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

2760

exitcode = EX_UNAVAILABLE;

1379

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

1380

exitcode = EXIT_FAILURE;

2761

1381

goto end;

2762

1382

} else {

2763

1383

gnutls_initialized = true;

2767

1387

goto end;

2768

1388

}

2769

1389

2770

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

2771

tempdir = mkdtemp(run_tempdir);

2772

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

2773

if(debug){

2774

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

2775

run_tempdir, old_tempdir);

2776

}

2777

tempdir = mkdtemp(old_tempdir);

2778

}

2779

if(tempdir == NULL){

2780

perror_plus("mkdtemp");

1390

tempdir_created = true;

1391

if(mkdtemp(tempdir) == NULL){

1392

tempdir_created = false;

1393

perror("mkdtemp");

2781

1394

goto end;

2782

1395

}

2783

1396

2785

1398

goto end;

2786

1399

}

2787

1400

2788

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

2789

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

2790

exitcode = EX_UNAVAILABLE;

1401

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

1402

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

1403

exitcode = EXIT_FAILURE;

2791

1404

goto end;

2792

1405

} else {

2793

1406

gpgme_initialized = true;

2801

1414

/* Connect directly, do not use Zeroconf */

2802

1415

/* (Mainly meant for debugging) */

2803

1416

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

2804

2805

1417

if(address == NULL){

2806

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

2807

exitcode = EX_USAGE;

1418

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

1419

exitcode = EXIT_FAILURE;

2808

1420

goto end;

2809

1421

}

2810

1422

2812

1424

goto end;

2813

1425

}

2814

1426

2815

in_port_t port;

1427

uint16_t port;

2816

1428

errno = 0;

2817

1429

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

2818

1430

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

2819

or tmpmax != (in_port_t)tmpmax){

2820

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

2821

exitcode = EX_USAGE;

1431

or tmpmax != (uint16_t)tmpmax){

1432

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

1433

exitcode = EXIT_FAILURE;

2822

1434

goto end;

2823

1435

}

2824

1436

2825

1437

if(quit_now){

2826

1438

goto end;

2827

1439

}

2828

1440

2829

port = (in_port_t)tmpmax;

1441

port = (uint16_t)tmpmax;

2830

1442

*address = '\0';

1443

address = connect_to;

2831

1444

/* Colon in address indicates IPv6 */

2832

1445

int af;

2833

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

1446

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

2834

1447

af = AF_INET6;

2835

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

2836

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

2837

{

2838

connect_to++;

2839

address[-1] = '\0';

2840

}

2841

1448

} else {

2842

1449

af = AF_INET;

2843

1450

}

2844

address = connect_to;

2845

1451

2846

1452

if(quit_now){

2847

1453

goto end;

2848

1454

}

2849

1455

2850

while(not quit_now){

2851

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

2852

&mc);

2853

if(quit_now or ret == 0){

2854

break;

2855

}

2856

if(debug){

2857

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

2858

(int)retry_interval);

2859

}

2860

sleep((unsigned int)retry_interval);

2861

}

2862

2863

if(not quit_now){

1456

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

1457

if(ret < 0){

1458

exitcode = EXIT_FAILURE;

1459

} else {

2864

1460

exitcode = EXIT_SUCCESS;

2865

1461

}

2866

2867

1462

goto end;

2868

1463

}

2869

1464

2881

1476

config.publish_domain = 0;

2882

1477

2883

1478

/* Allocate a new server */

2884

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2885

&config, NULL, NULL, &ret_errno);

1479

mc.server = avahi_server_new(avahi_simple_poll_get

1480

(mc.simple_poll), &config, NULL,

1481

NULL, &error);

2886

1482

2887

1483

/* Free the Avahi configuration data */

2888

1484

avahi_server_config_free(&config);

2890

1486

2891

1487

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

2892

1488

if(mc.server == NULL){

2893

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

2894

avahi_strerror(ret_errno));

2895

exitcode = EX_UNAVAILABLE;

1489

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

1490

avahi_strerror(error));

1491

exitcode = EXIT_FAILURE;

2896

1492

goto end;

2897

1493

}

2898

1494

2903

1499

/* Create the Avahi service browser */

2904

1500

sb = avahi_s_service_browser_new(mc.server, if_index,

2905

1501

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2906

NULL, 0, browse_callback,

2907

(void *)&mc);

1502

NULL, 0, browse_callback, NULL);

2908

1503

if(sb == NULL){

2909

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

2910

avahi_strerror(avahi_server_errno(mc.server)));

2911

exitcode = EX_UNAVAILABLE;

1504

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

1505

avahi_strerror(avahi_server_errno(mc.server)));

1506

exitcode = EXIT_FAILURE;

2912

1507

goto end;

2913

1508

}

2914

1509

2919

1514

/* Run the main loop */

2920

1515

2921

1516

if(debug){

2922

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

1517

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

2923

1518

}

2924

1519

2925

ret = avahi_loop_with_timeout(simple_poll,

2926

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

2927

if(debug){

2928

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

2929

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

2930

}

1520

avahi_simple_poll_loop(mc.simple_poll);

2931

1521

2932

1522

end:

2933

1523

2934

1524

if(debug){

2935

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

1525

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

2936

1526

}

2937

1527

2938

1528

/* Cleanup things */

2939

free(mc.interfaces);

2940

2941

1529

if(sb != NULL)

2942

1530

avahi_s_service_browser_free(sb);

2943

1531

2944

1532

if(mc.server != NULL)

2945

1533

avahi_server_free(mc.server);

2946

1534

2947

if(simple_poll != NULL)

2948

avahi_simple_poll_free(simple_poll);

1535

if(mc.simple_poll != NULL)

1536

avahi_simple_poll_free(mc.simple_poll);

2949

1537

2950

1538

if(gnutls_initialized){

2951

1539

gnutls_certificate_free_credentials(mc.cred);

2957

1545

gpgme_release(mc.ctx);

2958

1546

}

2959

1547

2960

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

2961

has seen */

2962

if(mc.current_server != NULL){

2963

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

2964

while(mc.current_server != NULL){

2965

server *next = mc.current_server->next;

2966

#ifdef __GNUC__

2967

#pragma GCC diagnostic push

2968

#pragma GCC diagnostic ignored "-Wcast-qual"

2969

#endif

2970

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

2971

#ifdef __GNUC__

2972

#pragma GCC diagnostic pop

2973

#endif

2974

free(mc.current_server);

2975

mc.current_server = next;

2976

}

2977

}

2978

2979

/* Re-raise privileges */

2980

{

2981

ret_errno = raise_privileges();

2982

if(ret_errno != 0){

2983

errno = ret_errno;

2984

perror_plus("Failed to raise privileges");

2985

} else {

2986

2987

/* Run network hooks */

2988

run_network_hooks("stop", interfaces_hooks != NULL ?

2989

interfaces_hooks : "", delay);

2990

2991

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

2992

{

2993

char *interface = NULL;

2994

while((interface=argz_next(interfaces_to_take_down,

2995

interfaces_to_take_down_size,

2996

interface))){

2997

ret_errno = take_down_interface(interface);

2998

if(ret_errno != 0){

2999

errno = ret_errno;

3000

perror_plus("Failed to take down interface");

3001

}

3002

}

3003

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

3004

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

3005

" down\n");

3006

}

3007

}

3008

}

3009

3010

ret_errno = lower_privileges_permanently();

3011

if(ret_errno != 0){

3012

errno = ret_errno;

3013

perror_plus("Failed to lower privileges permanently");

3014

}

3015

}

3016

3017

free(interfaces_to_take_down);

3018

free(interfaces_hooks);

3019

3020

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

3021

if(tempdir != NULL){

3022

struct dirent **direntries = NULL;

3023

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

3024

| O_NOFOLLOW

3025

| O_DIRECTORY

3026

| O_PATH));

3027

if(tempdir_fd == -1){

3028

perror_plus("open");

3029

} else {

3030

#ifdef __GLIBC__

3031

#if __GLIBC_PREREQ(2, 15)

3032

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

3033

notdotentries, alphasort);

3034

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

3035

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

3036

alphasort);

3037

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

3038

#else /* not __GLIBC__ */

3039

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

3040

alphasort);

3041

#endif /* not __GLIBC__ */

3042

if(numentries >= 0){

3043

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

3044

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

3045

if(ret == -1){

3046

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

3047

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

3048

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

3049

}

3050

free(direntries[i]);

3051

}

3052

3053

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

3054

free(direntries);

3055

if(numentries == -1){

3056

perror_plus("scandir");

3057

}

3058

ret = rmdir(tempdir);

3059

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

3060

perror_plus("rmdir");

3061

}

3062

}

3063

TEMP_FAILURE_RETRY(close(tempdir_fd));

1548

/* Take down the network interface */

1549

if(take_down_interface){

1550

/* Re-raise priviliges */

1551

errno = 0;

1552

ret = seteuid(0);

1553

if(ret == -1){

1554

perror("seteuid");

1555

}

1556

if(geteuid() == 0){

1557

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

1558

if(ret == -1){

1559

perror("ioctl SIOCGIFFLAGS");

1560

} else if(network.ifr_flags & IFF_UP) {

1561

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

1562

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

1563

if(ret == -1){

1564

perror("ioctl SIOCSIFFLAGS");

1565

}

1566

}

1567

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

1568

if(ret == -1){

1569

perror("close");

1570

}

1571

/* Lower privileges permanently */

1572

errno = 0;

1573

ret = setuid(uid);

1574

if(ret == -1){

1575

perror("setuid");

1576

}

1577

}

1578

}

1579

1580

/* Removes the temp directory used by GPGME */

1581

if(tempdir_created){

1582

DIR *d;

1583

struct dirent *direntry;

1584

d = opendir(tempdir);

1585

if(d == NULL){

1586

if(errno != ENOENT){

1587

perror("opendir");

1588

}

1589

} else {

1590

while(true){

1591

direntry = readdir(d);

1592

if(direntry == NULL){

1593

break;

1594

}

1595

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

1596

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

1597

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

1598

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

1599

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

1600

continue;

1601

}

1602

char *fullname = NULL;

1603

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

1604

direntry->d_name);

1605

if(ret < 0){

1606

perror("asprintf");

1607

continue;

1608

}

1609

ret = remove(fullname);

1610

if(ret == -1){

1611

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

1612

strerror(errno));

1613

}

1614

free(fullname);

1615

}

1616

closedir(d);

1617

}

1618

ret = rmdir(tempdir);

1619

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

1620

perror("rmdir");

3064

1621

}

3065

1622

}

3066

1623

3071

1628

&old_sigterm_action,

3072

1629

NULL));

3073

1630

if(ret == -1){

3074

perror_plus("sigaction");

1631

perror("sigaction");

3075

1632

}

3076

1633

do {

3077

1634

ret = raise(signal_received);

3078

1635

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

3079

1636

if(ret != 0){

3080

perror_plus("raise");

1637

perror("raise");

3081

1638

abort();

3082

1639

}

3083

1640

TEMP_FAILURE_RETRY(pause());