/mandos/trunk : revision 24.1.153

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

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*

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* Everything else is

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*

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

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

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* along with this program. If not, see

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

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*

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

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

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*/

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

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#ifndef _LARGEFILE_SOURCE

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

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

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asprintf(), strncpy(), strsignal()

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*/

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

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

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

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

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sockaddr_in6, PF_INET6,

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SOCK_STREAM, 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(), AT_REMOVEDIR */

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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, EINTR, EINVAL,

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EAI_SYSTEM, ENETUNREACH,

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EHOSTUNREACH, ECONNREFUSED, EPROTO,

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EIO, ENOENT, ENXIO, ENOMEM, EISDIR,

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ENOTEMPTY,

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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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raise() */

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

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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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

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WEXITSTATUS(), WTERMSIG() */

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

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

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argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

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argz_count() */

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

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EAI_SYSTEM, gai_strerror() */

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#ifdef __linux__

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89

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

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107

init_gnutls_session(),

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108

GNUTLS_* */

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#include <gnutls/openpgp.h>

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* GPGME */

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

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122

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

139

123

#define SECKEY "seckey.txt"

140

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#define PUBKEY "pubkey.txt"

141

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

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143

126

bool debug = false;

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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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/* 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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165

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

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132

typedef struct {

133

AvahiSimplePoll *simple_poll;

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134

AvahiServer *server;

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135

gnutls_certificate_credentials_t cred;

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136

unsigned int dh_bits;

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137

gnutls_dh_params_t dh_params;

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138

const char *priority;

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139

gpgme_ctx_t ctx;

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server *current_server;

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char *interfaces;

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size_t interfaces_size;

176

140

} mandos_context;

177

141

178

/* global so signal handler can reach it*/

179

AvahiSimplePoll *simple_poll;

142

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

143

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

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.dh_bits = 1024, .priority = "SECURE256"

145

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

180

146

181

147

sig_atomic_t quit_now = 0;

182

148

int signal_received = 0;

183

149

184

/* Function to use when printing errors */

185

void perror_plus(const char *print_text){

186

int e = errno;

187

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

188

program_invocation_short_name);

189

errno = e;

190

perror(print_text);

191

}

192

193

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

194

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

195

va_list ap;

196

va_start (ap, format);

197

198

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

199

program_invocation_short_name));

200

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

201

}

202

203

150

/*

204

151

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

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152

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

206

153

* "buffer_length" is how much is already used.

207

154

*/

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__attribute__((nonnull, warn_unused_result))

209

155

size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

156

size_t buffer_capacity){

211

157

if(buffer_length + BUFFER_SIZE > buffer_capacity){

212

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

213

if(new_buf == NULL){

214

int old_errno = errno;

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free(*buffer);

216

errno = old_errno;

217

*buffer = NULL;

158

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

159

if(buffer == NULL){

218

160

return 0;

219

161

}

220

*buffer = new_buf;

221

162

buffer_capacity += BUFFER_SIZE;

222

163

}

223

164

return buffer_capacity;

224

165

}

225

166

226

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

227

__attribute__((nonnull, warn_unused_result))

228

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

229

int af, server **current_server){

230

int ret;

231

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

232

if(new_server == NULL){

233

perror_plus("malloc");

234

return false;

235

}

236

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

237

.port = port,

238

.if_index = if_index,

239

.af = af };

240

if(new_server->ip == NULL){

241

perror_plus("strdup");

242

free(new_server);

243

return false;

244

}

245

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

246

if(ret == -1){

247

perror_plus("clock_gettime");

248

#ifdef __GNUC__

249

#pragma GCC diagnostic push

250

#pragma GCC diagnostic ignored "-Wcast-qual"

251

#endif

252

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

253

#ifdef __GNUC__

254

#pragma GCC diagnostic pop

255

#endif

256

free(new_server);

257

return false;

258

}

259

/* Special case of first server */

260

if(*current_server == NULL){

261

new_server->next = new_server;

262

new_server->prev = new_server;

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*current_server = new_server;

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} else {

265

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

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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;

270

}

271

return true;

272

}

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274

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/*

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168

* Initialize GPGME.

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169

*/

277

__attribute__((nonnull, warn_unused_result))

278

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){

282

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gpgme_error_t rc;

283

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gpgme_engine_info_t engine_info;

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174

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285

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/*

286

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

287

178

*/

288

bool import_key(const char * const filename){

179

bool import_key(const char *filename){

289

180

int ret;

290

181

int fd;

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182

gpgme_data_t pgp_data;

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

294

185

if(fd == -1){

295

perror_plus("open");

186

perror("open");

296

187

return false;

297

188

}

298

189

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

300

191

if(rc != GPG_ERR_NO_ERROR){

301

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

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gpgme_strsource(rc), gpgme_strerror(rc));

192

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

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gpgme_strsource(rc), gpgme_strerror(rc));

303

194

return false;

304

195

}

305

196

306

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

197

rc = gpgme_op_import(mc.ctx, pgp_data);

307

198

if(rc != GPG_ERR_NO_ERROR){

308

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

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gpgme_strsource(rc), gpgme_strerror(rc));

199

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

200

gpgme_strsource(rc), gpgme_strerror(rc));

310

201

return false;

311

202

}

312

203

313

ret = close(fd);

204

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

314

205

if(ret == -1){

315

perror_plus("close");

206

perror("close");

316

207

}

317

208

gpgme_data_release(pgp_data);

318

209

return true;

319

210

}

320

211

321

212

if(debug){

322

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

213

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

323

214

}

324

215

325

216

/* Init GPGME */

326

217

gpgme_check_version(NULL);

327

218

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

328

219

if(rc != GPG_ERR_NO_ERROR){

329

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

330

gpgme_strsource(rc), gpgme_strerror(rc));

220

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

221

gpgme_strsource(rc), gpgme_strerror(rc));

331

222

return false;

332

223

}

333

224

334

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

225

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

335

226

rc = gpgme_get_engine_info(&engine_info);

336

227

if(rc != GPG_ERR_NO_ERROR){

337

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

338

gpgme_strsource(rc), gpgme_strerror(rc));

228

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

229

gpgme_strsource(rc), gpgme_strerror(rc));

339

230

return false;

340

231

}

341

232

while(engine_info != NULL){

347

238

engine_info = engine_info->next;

348

239

}

349

240

if(engine_info == NULL){

350

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

351

tempdir);

241

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

352

242

return false;

353

243

}

354

244

355

245

/* Create new GPGME "context" */

356

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

246

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

357

247

if(rc != GPG_ERR_NO_ERROR){

358

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

359

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

360

gpgme_strerror(rc));

248

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

249

gpgme_strsource(rc), gpgme_strerror(rc));

361

250

return false;

362

251

}

363

252

372

261

* Decrypt OpenPGP data.

373

262

* Returns -1 on error

374

263

*/

375

__attribute__((nonnull, warn_unused_result))

376

264

static ssize_t pgp_packet_decrypt(const char *cryptotext,

377

265

size_t crypto_size,

378

char **plaintext,

379

mandos_context *mc){

266

char **plaintext){

380

267

gpgme_data_t dh_crypto, dh_plain;

381

268

gpgme_error_t rc;

382

269

ssize_t ret;

384

271

ssize_t plaintext_length = 0;

385

272

386

273

if(debug){

387

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

274

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

388

275

}

389

276

390

277

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

391

278

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

392

279

0);

393

280

if(rc != GPG_ERR_NO_ERROR){

394

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

395

gpgme_strsource(rc), gpgme_strerror(rc));

281

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

282

gpgme_strsource(rc), gpgme_strerror(rc));

396

283

return -1;

397

284

}

398

285

399

286

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

400

287

rc = gpgme_data_new(&dh_plain);

401

288

if(rc != GPG_ERR_NO_ERROR){

402

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

403

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

404

gpgme_strsource(rc), gpgme_strerror(rc));

289

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

290

gpgme_strsource(rc), gpgme_strerror(rc));

405

291

gpgme_data_release(dh_crypto);

406

292

return -1;

407

293

}

408

294

409

295

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

410

296

data buffer */

411

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

297

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

412

298

if(rc != GPG_ERR_NO_ERROR){

413

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

414

gpgme_strsource(rc), gpgme_strerror(rc));

299

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

300

gpgme_strsource(rc), gpgme_strerror(rc));

415

301

plaintext_length = -1;

416

302

if(debug){

417

303

gpgme_decrypt_result_t result;

418

result = gpgme_op_decrypt_result(mc->ctx);

304

result = gpgme_op_decrypt_result(mc.ctx);

419

305

if(result == NULL){

420

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

306

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

421

307

} else {

422

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

423

result->unsupported_algorithm);

424

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

425

result->wrong_key_usage);

308

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

309

result->unsupported_algorithm);

310

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

311

result->wrong_key_usage);

426

312

if(result->file_name != NULL){

427

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

313

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

428

314

}

429

315

gpgme_recipient_t recipient;

430

316

recipient = result->recipients;

431

317

while(recipient != NULL){

432

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

433

gpgme_pubkey_algo_name

434

(recipient->pubkey_algo));

435

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

436

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

437

recipient->status == GPG_ERR_NO_SECKEY

438

? "No" : "Yes");

318

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

319

gpgme_pubkey_algo_name(recipient->pubkey_algo));

320

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

321

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

322

recipient->status == GPG_ERR_NO_SECKEY

323

? "No" : "Yes");

439

324

recipient = recipient->next;

440

325

}

441

326

}

444

329

}

445

330

446

331

if(debug){

447

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

332

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

448

333

}

449

334

450

335

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

451

336

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

452

perror_plus("gpgme_data_seek");

337

perror("gpgme_data_seek");

453

338

plaintext_length = -1;

454

339

goto decrypt_end;

455

340

}

457

342

*plaintext = NULL;

458

343

while(true){

459

344

plaintext_capacity = incbuffer(plaintext,

460

(size_t)plaintext_length,

461

plaintext_capacity);

345

(size_t)plaintext_length,

346

plaintext_capacity);

462

347

if(plaintext_capacity == 0){

463

perror_plus("incbuffer");

464

plaintext_length = -1;

465

goto decrypt_end;

348

perror("incbuffer");

349

plaintext_length = -1;

350

goto decrypt_end;

466

351

}

467

352

468

353

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

473

358

break;

474

359

}

475

360

if(ret < 0){

476

perror_plus("gpgme_data_read");

361

perror("gpgme_data_read");

477

362

plaintext_length = -1;

478

363

goto decrypt_end;

479

364

}

481

366

}

482

367

483

368

if(debug){

484

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

369

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

485

370

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

486

371

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

487

372

}

498

383

return plaintext_length;

499

384

}

500

385

501

__attribute__((warn_unused_result, const))

502

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

503

if(str == NULL)

504

return "(unknown)";

505

return str;

506

}

507

508

__attribute__((warn_unused_result))

509

static const char *safer_gnutls_strerror(int value){

510

const char *ret = gnutls_strerror(value);

511

return safe_string(ret);

386

static const char * safer_gnutls_strerror(int value){

387

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

388

-Wunreachable-code */

389

if(ret == NULL)

390

ret = "(unknown)";

391

return ret;

512

392

}

513

393

514

394

/* GnuTLS log function callback */

515

__attribute__((nonnull))

516

395

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

517

396

const char* string){

518

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

397

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

519

398

}

520

399

521

__attribute__((nonnull(1, 2, 4), warn_unused_result))

522

400

static int init_gnutls_global(const char *pubkeyfilename,

523

const char *seckeyfilename,

524

const char *dhparamsfilename,

525

mandos_context *mc){

401

const char *seckeyfilename){

526

402

int ret;

527

unsigned int uret;

528

403

529

404

if(debug){

530

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

405

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

406

}

407

408

ret = gnutls_global_init();

409

if(ret != GNUTLS_E_SUCCESS){

410

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

411

safer_gnutls_strerror(ret));

412

return -1;

531

413

}

532

414

533

415

if(debug){

539

421

}

540

422

541

423

/* OpenPGP credentials */

542

ret = gnutls_certificate_allocate_credentials(&mc->cred);

424

gnutls_certificate_allocate_credentials(&mc.cred);

543

425

if(ret != GNUTLS_E_SUCCESS){

544

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

545

safer_gnutls_strerror(ret));

426

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

427

from

428

-Wunreachable-code

429

*/

430

safer_gnutls_strerror(ret));

431

gnutls_global_deinit();

546

432

return -1;

547

433

}

548

434

549

435

if(debug){

550

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

551

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

552

pubkeyfilename,

553

seckeyfilename);

436

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

437

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

438

seckeyfilename);

554

439

}

555

440

556

441

ret = gnutls_certificate_set_openpgp_key_file

557

(mc->cred, pubkeyfilename, seckeyfilename,

442

(mc.cred, pubkeyfilename, seckeyfilename,

558

443

GNUTLS_OPENPGP_FMT_BASE64);

559

444

if(ret != GNUTLS_E_SUCCESS){

560

fprintf_plus(stderr,

561

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

562

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

563

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

564

safer_gnutls_strerror(ret));

445

fprintf(stderr,

446

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

447

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

448

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

449

safer_gnutls_strerror(ret));

565

450

goto globalfail;

566

451

}

567

452

568

453

/* GnuTLS server initialization */

569

ret = gnutls_dh_params_init(&mc->dh_params);

570

if(ret != GNUTLS_E_SUCCESS){

571

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

572

" initialization: %s\n",

573

safer_gnutls_strerror(ret));

574

goto globalfail;

575

}

576

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

577

if(dhparamsfilename != NULL){

578

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

579

do {

580

int dhpfile = open(dhparamsfilename, O_RDONLY);

581

if(dhpfile == -1){

582

perror_plus("open");

583

dhparamsfilename = NULL;

584

break;

585

}

586

size_t params_capacity = 0;

587

while(true){

588

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

589

(size_t)params.size,

590

(size_t)params_capacity);

591

if(params_capacity == 0){

592

perror_plus("incbuffer");

593

free(params.data);

594

params.data = NULL;

595

dhparamsfilename = NULL;

596

break;

597

}

598

ssize_t bytes_read = read(dhpfile,

599

params.data + params.size,

600

BUFFER_SIZE);

601

/* EOF */

602

if(bytes_read == 0){

603

break;

604

}

605

/* check bytes_read for failure */

606

if(bytes_read < 0){

607

perror_plus("read");

608

free(params.data);

609

params.data = NULL;

610

dhparamsfilename = NULL;

611

break;

612

}

613

params.size += (unsigned int)bytes_read;

614

}

615

if(params.data == NULL){

616

dhparamsfilename = NULL;

617

}

618

if(dhparamsfilename == NULL){

619

break;

620

}

621

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

622

GNUTLS_X509_FMT_PEM);

623

if(ret != GNUTLS_E_SUCCESS){

624

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

625

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

626

safer_gnutls_strerror(ret));

627

dhparamsfilename = NULL;

628

}

629

free(params.data);

630

} while(false);

631

}

632

if(dhparamsfilename == NULL){

633

if(mc->dh_bits == 0){

634

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

635

/* Try to read the private key file */

636

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

637

do {

638

int secfile = open(seckeyfilename, O_RDONLY);

639

if(secfile == -1){

640

perror_plus("open");

641

break;

642

}

643

size_t buffer_capacity = 0;

644

while(true){

645

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

646

(size_t)buffer.size,

647

(size_t)buffer_capacity);

648

if(buffer_capacity == 0){

649

perror_plus("incbuffer");

650

free(buffer.data);

651

buffer.data = NULL;

652

break;

653

}

654

ssize_t bytes_read = read(secfile,

655

buffer.data + buffer.size,

656

BUFFER_SIZE);

657

/* EOF */

658

if(bytes_read == 0){

659

break;

660

}

661

/* check bytes_read for failure */

662

if(bytes_read < 0){

663

perror_plus("read");

664

free(buffer.data);

665

buffer.data = NULL;

666

break;

667

}

668

buffer.size += (unsigned int)bytes_read;

669

}

670

close(secfile);

671

} while(false);

672

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

673

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

674

if(buffer.data != NULL){

675

{

676

gnutls_openpgp_privkey_t privkey = NULL;

677

ret = gnutls_openpgp_privkey_init(&privkey);

678

if(ret != GNUTLS_E_SUCCESS){

679

fprintf_plus(stderr, "Error initializing OpenPGP key"

680

" structure: %s",

681

safer_gnutls_strerror(ret));

682

free(buffer.data);

683

buffer.data = NULL;

684

} else {

685

ret = gnutls_openpgp_privkey_import

686

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

687

if(ret != GNUTLS_E_SUCCESS){

688

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

689

safer_gnutls_strerror(ret));

690

privkey = NULL;

691

}

692

free(buffer.data);

693

buffer.data = NULL;

694

if(privkey != NULL){

695

/* Use private key to suggest an appropriate

696

sec_param */

697

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

698

gnutls_openpgp_privkey_deinit(privkey);

699

if(debug){

700

fprintf_plus(stderr, "This OpenPGP key implies using"

701

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

702

safe_string(gnutls_sec_param_get_name

703

(sec_param)));

704

}

705

}

706

}

707

}

708

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

709

/* Err on the side of caution */

710

sec_param = GNUTLS_SEC_PARAM_ULTRA;

711

if(debug){

712

fprintf_plus(stderr, "Falling back to security parameter"

713

" \"%s\"\n",

714

safe_string(gnutls_sec_param_get_name

715

(sec_param)));

716

}

717

}

718

}

719

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

720

if(uret != 0){

721

mc->dh_bits = uret;

722

if(debug){

723

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

724

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

725

safe_string(gnutls_sec_param_get_name

726

(sec_param)),

727

mc->dh_bits);

728

}

729

} else {

730

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

731

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

732

safe_string(gnutls_sec_param_get_name

733

(sec_param)),

734

safer_gnutls_strerror(ret));

735

goto globalfail;

736

}

737

} else if(debug){

738

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

739

mc->dh_bits);

740

}

741

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

742

if(ret != GNUTLS_E_SUCCESS){

743

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

744

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

745

safer_gnutls_strerror(ret));

746

goto globalfail;

747

}

748

}

749

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

454

ret = gnutls_dh_params_init(&mc.dh_params);

455

if(ret != GNUTLS_E_SUCCESS){

456

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

457

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

458

goto globalfail;

459

}

460

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

461

if(ret != GNUTLS_E_SUCCESS){

462

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

463

safer_gnutls_strerror(ret));

464

goto globalfail;

465

}

466

467

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

750

468

751

469

return 0;

752

470

753

471

globalfail:

754

472

755

gnutls_certificate_free_credentials(mc->cred);

756

gnutls_dh_params_deinit(mc->dh_params);

473

gnutls_certificate_free_credentials(mc.cred);

474

gnutls_global_deinit();

475

gnutls_dh_params_deinit(mc.dh_params);

757

476

return -1;

758

477

}

759

478

760

__attribute__((nonnull, warn_unused_result))

761

static int init_gnutls_session(gnutls_session_t *session,

762

mandos_context *mc){

479

static int init_gnutls_session(gnutls_session_t *session){

763

480

int ret;

764

481

/* GnuTLS session creation */

765

482

do {

769

486

}

770

487

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

771

488

if(ret != GNUTLS_E_SUCCESS){

772

fprintf_plus(stderr,

773

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

774

safer_gnutls_strerror(ret));

489

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

490

safer_gnutls_strerror(ret));

775

491

}

776

492

777

493

{

778

494

const char *err;

779

495

do {

780

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

496

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

781

497

if(quit_now){

782

498

gnutls_deinit(*session);

783

499

return -1;

784

500

}

785

501

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

786

502

if(ret != GNUTLS_E_SUCCESS){

787

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

788

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

789

safer_gnutls_strerror(ret));

503

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

504

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

505

safer_gnutls_strerror(ret));

790

506

gnutls_deinit(*session);

791

507

return -1;

792

508

}

794

510

795

511

do {

796

512

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

797

mc->cred);

513

mc.cred);

798

514

if(quit_now){

799

515

gnutls_deinit(*session);

800

516

return -1;

801

517

}

802

518

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

803

519

if(ret != GNUTLS_E_SUCCESS){

804

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

805

safer_gnutls_strerror(ret));

520

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

521

safer_gnutls_strerror(ret));

806

522

gnutls_deinit(*session);

807

523

return -1;

808

524

}

810

526

/* ignore client certificate if any. */

811

527

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

812

528

529

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

530

813

531

return 0;

814

532

}

815

533

817

535

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

818

536

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

819

537

820

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

821

__attribute__((warn_unused_result))

822

int raise_privileges(void){

823

int old_errno = errno;

824

int ret = 0;

825

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

826

ret = errno;

827

}

828

errno = old_errno;

829

return ret;

830

}

831

832

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

833

__attribute__((warn_unused_result))

834

int raise_privileges_permanently(void){

835

int old_errno = errno;

836

int ret = raise_privileges();

837

if(ret != 0){

838

errno = old_errno;

839

return ret;

840

}

841

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

842

ret = errno;

843

}

844

errno = old_errno;

845

return ret;

846

}

847

848

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

849

__attribute__((warn_unused_result))

850

int lower_privileges(void){

851

int old_errno = errno;

852

int ret = 0;

853

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

854

ret = errno;

855

}

856

errno = old_errno;

857

return ret;

858

}

859

860

/* Lower privileges permanently */

861

__attribute__((warn_unused_result))

862

int lower_privileges_permanently(void){

863

int old_errno = errno;

864

int ret = 0;

865

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

866

ret = errno;

867

}

868

errno = old_errno;

869

return ret;

870

}

871

872

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

873

__attribute__((nonnull, warn_unused_result))

874

static bool add_delete_local_route(const bool add,

875

const char *address,

876

AvahiIfIndex if_index){

877

int ret;

878

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

879

char add_arg[] = "add";

880

char delete_arg[] = "delete";

881

char debug_flag[] = "--debug";

882

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

883

if(pluginhelperdir == NULL){

884

if(debug){

885

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

886

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

887

}

888

return false;

889

}

890

891

char interface[IF_NAMESIZE];

892

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

893

perror_plus("if_indextoname");

894

return false;

895

}

896

897

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

898

if(devnull == -1){

899

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

900

return false;

901

}

902

pid_t pid = fork();

903

if(pid == 0){

904

/* Child */

905

/* Raise privileges */

906

errno = raise_privileges_permanently();

907

if(errno != 0){

908

perror_plus("Failed to raise privileges");

909

/* _exit(EX_NOPERM); */

910

} else {

911

/* Set group */

912

errno = 0;

913

ret = setgid(0);

914

if(ret == -1){

915

perror_plus("setgid");

916

_exit(EX_NOPERM);

917

}

918

/* Reset supplementary groups */

919

errno = 0;

920

ret = setgroups(0, NULL);

921

if(ret == -1){

922

perror_plus("setgroups");

923

_exit(EX_NOPERM);

924

}

925

}

926

ret = dup2(devnull, STDIN_FILENO);

927

if(ret == -1){

928

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

929

_exit(EX_OSERR);

930

}

931

ret = close(devnull);

932

if(ret == -1){

933

perror_plus("close");

934

_exit(EX_OSERR);

935

}

936

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

937

if(ret == -1){

938

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

939

_exit(EX_OSERR);

940

}

941

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

942

O_RDONLY

943

| O_DIRECTORY

944

| O_PATH

945

| O_CLOEXEC));

946

if(helperdir_fd == -1){

947

perror_plus("open");

948

_exit(EX_UNAVAILABLE);

949

}

950

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

951

helper, O_RDONLY));

952

if(helper_fd == -1){

953

perror_plus("openat");

954

close(helperdir_fd);

955

_exit(EX_UNAVAILABLE);

956

}

957

close(helperdir_fd);

958

#ifdef __GNUC__

959

#pragma GCC diagnostic push

960

#pragma GCC diagnostic ignored "-Wcast-qual"

961

#endif

962

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

963

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

964

interface, debug ? debug_flag : NULL, NULL },

965

environ) == -1){

966

#ifdef __GNUC__

967

#pragma GCC diagnostic pop

968

#endif

969

perror_plus("fexecve");

970

_exit(EXIT_FAILURE);

971

}

972

}

973

if(pid == -1){

974

perror_plus("fork");

975

return false;

976

}

977

int status;

978

pid_t pret = -1;

979

errno = 0;

980

do {

981

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

982

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

983

int errno_raising = 0;

984

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

985

errno_raising = errno;

986

perror_plus("Failed to raise privileges in order to"

987

" kill helper program");

988

}

989

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

990

perror_plus("kill");

991

}

992

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

993

perror_plus("Failed to lower privileges after killing"

994

" helper program");

995

}

996

return false;

997

}

998

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

999

if(pret == -1){

1000

perror_plus("waitpid");

1001

return false;

1002

}

1003

if(WIFEXITED(status)){

1004

if(WEXITSTATUS(status) != 0){

1005

fprintf_plus(stderr, "Error: iprouteadddel exited"

1006

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

1007

return false;

1008

}

1009

return true;

1010

}

1011

if(WIFSIGNALED(status)){

1012

fprintf_plus(stderr, "Error: iprouteadddel died by"

1013

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

1014

return false;

1015

}

1016

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

1017

return false;

1018

}

1019

1020

__attribute__((nonnull, warn_unused_result))

1021

static bool add_local_route(const char *address,

1022

AvahiIfIndex if_index){

1023

if(debug){

1024

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

1025

}

1026

return add_delete_local_route(true, address, if_index);

1027

}

1028

1029

__attribute__((nonnull, warn_unused_result))

1030

static bool delete_local_route(const char *address,

1031

AvahiIfIndex if_index){

1032

if(debug){

1033

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

1034

}

1035

return add_delete_local_route(false, address, if_index);

1036

}

1037

1038

538

/* Called when a Mandos server is found */

1039

__attribute__((nonnull, warn_unused_result))

1040

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

539

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

1041

540

AvahiIfIndex if_index,

1042

int af, mandos_context *mc){

541

int af){

1043

542

int ret, tcp_sd = -1;

1044

543

ssize_t sret;

1045

struct sockaddr_storage to;

544

union {

545

struct sockaddr_in in;

546

struct sockaddr_in6 in6;

547

} to;

1046

548

char *buffer = NULL;

1047

549

char *decrypted_buffer = NULL;

1048

550

size_t buffer_length = 0;

1051

553

int retval = -1;

1052

554

gnutls_session_t session;

1053

555

int pf; /* Protocol family */

1054

bool route_added = false;

1055

556

1056

557

errno = 0;

1057

558

1068

569

pf = PF_INET;

1069

570

break;

1070

571

default:

1071

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

572

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

1072

573

errno = EINVAL;

1073

574

return -1;

1074

575

}

1075

576

1076

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

1077

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

1078

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

1079

bool match = false;

1080

{

1081

char *interface = NULL;

1082

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

1083

mc->interfaces_size,

1084

interface))){

1085

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

1086

match = true;

1087

break;

1088

}

1089

}

1090

}

1091

if(not match){

1092

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

1093

connect to the server */

1094

if(debug){

1095

char interface[IF_NAMESIZE];

1096

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

1097

perror_plus("if_indextoname");

1098

} else {

1099

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

1100

" \"%s\"\n",

1101

if_indextoname((unsigned int)if_index,

1102

interface));

1103

}

1104

}

1105

return -1;

1106

}

1107

}

1108

1109

ret = init_gnutls_session(&session, mc);

577

ret = init_gnutls_session(&session);

1110

578

if(ret != 0){

1111

579

return -1;

1112

580

}

1113

581

1114

582

if(debug){

1115

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

1116

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

583

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

584

"\n", ip, port);

1117

585

}

1118

586

1119

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

587

tcp_sd = socket(pf, SOCK_STREAM, 0);

1120

588

if(tcp_sd < 0){

1121

589

int e = errno;

1122

perror_plus("socket");

590

perror("socket");

1123

591

errno = e;

1124

592

goto mandos_end;

1125

593

}

1129

597

goto mandos_end;

1130

598

}

1131

599

600

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

1132

601

if(af == AF_INET6){

1133

struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;

1134

*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };

1135

ret = inet_pton(af, ip, &to6->sin6_addr);

602

to.in6.sin6_family = (sa_family_t)af;

603

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

1136

604

} else { /* IPv4 */

1137

struct sockaddr_in *to4 = (struct sockaddr_in *)&to;

1138

*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };

1139

ret = inet_pton(af, ip, &to4->sin_addr);

605

to.in.sin_family = (sa_family_t)af;

606

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

1140

607

}

1141

608

if(ret < 0 ){

1142

609

int e = errno;

1143

perror_plus("inet_pton");

610

perror("inet_pton");

1144

611

errno = e;

1145

612

goto mandos_end;

1146

613

}

1147

614

if(ret == 0){

1148

615

int e = errno;

1149

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

616

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

1150

617

errno = e;

1151

618

goto mandos_end;

1152

619

}

1153

620

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)){

621

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

622

-Wconversion and

623

-Wunreachable-code */

624

625

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

626

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

627

-Wunreachable-code*/

1157

628

if(if_index == AVAHI_IF_UNSPEC){

1158

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

1159

" incomplete without a network interface\n");

629

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

630

" without a network interface\n");

1160

631

errno = EINVAL;

1161

632

goto mandos_end;

1162

633

}

1163

634

/* Set the network interface number as scope */

1164

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

635

to.in6.sin6_scope_id = (uint32_t)if_index;

1165

636

}

1166

637

} else {

1167

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

638

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

639

-Wconversion and

640

-Wunreachable-code */

1168

641

}

1169

642

1170

643

if(quit_now){

1176

649

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

1177

650

char interface[IF_NAMESIZE];

1178

651

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

1179

perror_plus("if_indextoname");

652

perror("if_indextoname");

1180

653

} else {

1181

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

1182

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

654

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

655

ip, interface, port);

1183

656

}

1184

657

} else {

1185

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

1186

ip, (uintmax_t)port);

658

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

659

port);

1187

660

}

1188

661

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

1189

662

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) or (errno == EHOSTUNREACH))

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

https://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;

663

const char *pcret;

664

if(af == AF_INET6){

665

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

666

sizeof(addrstr));

667

} else {

668

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

669

sizeof(addrstr));

670

}

671

if(pcret == NULL){

672

perror("inet_ntop");

673

} else {

674

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

675

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

676

}

677

}

678

}

679

680

if(quit_now){

681

errno = EINTR;

682

goto mandos_end;

683

}

684

685

if(af == AF_INET6){

686

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

687

} else {

688

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

689

}

690

if(ret < 0){

691

int e = errno;

692

perror("connect");

693

errno = e;

694

goto mandos_end;

695

}

696

697

if(quit_now){

698

errno = EINTR;

699

goto mandos_end;

1270

700

}

1271

701

1272

702

const char *out = mandos_protocol_version;

1274

704

while(true){

1275

705

size_t out_size = strlen(out);

1276

706

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

1277

out_size - written));

707

out_size - written));

1278

708

if(ret == -1){

1279

709

int e = errno;

1280

perror_plus("write");

710

perror("write");

1281

711

errno = e;

1282

712

goto mandos_end;

1283

713

}

1300

730

}

1301

731

1302

732

if(debug){

1303

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

733

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

1304

734

}

1305

735

1306

736

if(quit_now){

1308

738

goto mandos_end;

1309

739

}

1310

740

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);

741

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

1316

742

1317

743

if(quit_now){

1318

744

errno = EINTR;

1329

755

1330

756

if(ret != GNUTLS_E_SUCCESS){

1331

757

if(debug){

1332

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

758

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

1333

759

gnutls_perror(ret);

1334

760

}

1335

761

errno = EPROTO;

1339

765

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

1340

766

1341

767

if(debug){

1342

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

1343

" %s\n", ip);

768

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

769

ip);

1344

770

}

1345

771

1346

772

while(true){

1351

777

}

1352

778

1353

779

buffer_capacity = incbuffer(&buffer, buffer_length,

1354

buffer_capacity);

780

buffer_capacity);

1355

781

if(buffer_capacity == 0){

1356

782

int e = errno;

1357

perror_plus("incbuffer");

783

perror("incbuffer");

1358

784

errno = e;

1359

785

goto mandos_end;

1360

786

}

1384

810

}

1385

811

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

1386

812

if(ret < 0){

1387

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

1388

"***\n");

813

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

1389

814

gnutls_perror(ret);

1390

815

errno = EPROTO;

1391

816

goto mandos_end;

1392

817

}

1393

818

break;

1394

819

default:

1395

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

1396

" encrypted session with Mandos server\n");

820

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

821

" encrypted session with Mandos server\n");

1397

822

gnutls_bye(session, GNUTLS_SHUT_RDWR);

1398

823

errno = EIO;

1399

824

goto mandos_end;

1404

829

}

1405

830

1406

831

if(debug){

1407

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

832

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

1408

833

}

1409

834

1410

835

if(quit_now){

1422

847

1423

848

if(buffer_length > 0){

1424

849

ssize_t decrypted_buffer_size;

1425

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

1426

&decrypted_buffer, mc);

850

decrypted_buffer_size = pgp_packet_decrypt(buffer,

851

buffer_length,

852

&decrypted_buffer);

1427

853

if(decrypted_buffer_size >= 0){

1428

854

1429

clearerr(stdout);

1430

855

written = 0;

1431

856

while(written < (size_t) decrypted_buffer_size){

1432

857

if(quit_now){

1440

865

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

1441

866

int e = errno;

1442

867

if(debug){

1443

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

1444

strerror(errno));

868

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

869

strerror(errno));

1445

870

}

1446

871

errno = e;

1447

872

goto mandos_end;

1448

873

}

1449

874

written += (size_t)ret;

1450

875

}

1451

ret = fflush(stdout);

1452

if(ret != 0){

1453

int e = errno;

1454

if(debug){

1455

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

1456

strerror(errno));

1457

}

1458

errno = e;

1459

goto mandos_end;

1460

}

1461

876

retval = 0;

1462

877

}

1463

878

}

1466

881

1467

882

mandos_end:

1468

883

{

1469

if(route_added){

1470

if(not delete_local_route(ip, if_index)){

1471

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

1472

" interface %d", ip, if_index);

1473

}

1474

}

1475

884

int e = errno;

1476

885

free(decrypted_buffer);

1477

886

free(buffer);

1478

887

if(tcp_sd >= 0){

1479

ret = close(tcp_sd);

888

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

1480

889

}

1481

890

if(ret == -1){

1482

891

if(e == 0){

1483

892

e = errno;

1484

893

}

1485

perror_plus("close");

894

perror("close");

1486

895

}

1487

896

gnutls_deinit(session);

1488

errno = e;

1489

897

if(quit_now){

1490

errno = EINTR;

898

e = EINTR;

1491

899

retval = -1;

1492

900

}

901

errno = e;

1493

902

}

1494

903

return retval;

1495

904

}

1496

905

1497

__attribute__((nonnull))

1498

906

static void resolve_callback(AvahiSServiceResolver *r,

1499

907

AvahiIfIndex interface,

1500

908

AvahiProtocol proto,

1508

916

AVAHI_GCC_UNUSED AvahiStringList *txt,

1509

917

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1510

918

flags,

1511

void *mc){

1512

if(r == NULL){

1513

return;

1514

}

919

AVAHI_GCC_UNUSED void* userdata){

920

assert(r);

1515

921

1516

922

/* Called whenever a service has been resolved successfully or

1517

923

timed out */

1518

924

1519

925

if(quit_now){

1520

avahi_s_service_resolver_free(r);

1521

926

return;

1522

927

}

1523

928

1524

929

switch(event){

1525

930

default:

1526

931

case AVAHI_RESOLVER_FAILURE:

1527

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

1528

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

1529

domain,

1530

avahi_strerror(avahi_server_errno

1531

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

932

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

933

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

934

avahi_strerror(avahi_server_errno(mc.server)));

1532

935

break;

1533

936

1534

937

case AVAHI_RESOLVER_FOUND:

1536

939

char ip[AVAHI_ADDRESS_STR_MAX];

1537

940

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

1538

941

if(debug){

1539

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

1540

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

1541

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

942

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

943

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

944

ip, (intmax_t)interface, port);

1542

945

}

1543

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

1544

interface,

1545

avahi_proto_to_af(proto),

1546

mc);

946

int ret = start_mandos_communication(ip, port, interface,

947

avahi_proto_to_af(proto));

1547

948

if(ret == 0){

1548

avahi_simple_poll_quit(simple_poll);

1549

} else {

1550

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

1551

avahi_proto_to_af(proto),

1552

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

1553

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

1554

" list\n", name);

1555

}

949

avahi_simple_poll_quit(mc.simple_poll);

1556

950

}

1557

951

}

1558

952

}

1568

962

const char *domain,

1569

963

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1570

964

flags,

1571

void *mc){

1572

if(b == NULL){

1573

return;

1574

}

965

AVAHI_GCC_UNUSED void* userdata){

966

assert(b);

1575

967

1576

968

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

1577

969

is removed from the LAN */

1584

976

default:

1585

977

case AVAHI_BROWSER_FAILURE:

1586

978

1587

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

1588

avahi_strerror(avahi_server_errno

1589

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

1590

avahi_simple_poll_quit(simple_poll);

979

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

980

avahi_strerror(avahi_server_errno(mc.server)));

981

avahi_simple_poll_quit(mc.simple_poll);

1591

982

return;

1592

983

1593

984

case AVAHI_BROWSER_NEW:

1596

987

the callback function is called the Avahi server will free the

1597

988

resolver for us. */

1598

989

1599

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

1600

interface, protocol, name, type,

1601

domain, protocol, 0,

1602

resolve_callback, mc) == NULL)

1603

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

1604

" %s\n", name,

1605

avahi_strerror(avahi_server_errno

1606

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

990

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

991

name, type, domain, protocol, 0,

992

resolve_callback, NULL) == NULL)

993

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

994

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

1607

995

break;

1608

996

1609

997

case AVAHI_BROWSER_REMOVE:

1612

1000

case AVAHI_BROWSER_ALL_FOR_NOW:

1613

1001

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1614

1002

if(debug){

1615

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

1616

" searching...\n");

1003

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

1617

1004

}

1618

1005

break;

1619

1006

}

1620

1007

}

1621

1008

1622

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

1009

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

1623

1010

static void handle_sigterm(int sig){

1624

1011

if(quit_now){

1625

1012

return;

1627

1014

quit_now = 1;

1628

1015

signal_received = sig;

1629

1016

int old_errno = errno;

1630

/* set main loop to exit */

1631

if(simple_poll != NULL){

1632

avahi_simple_poll_quit(simple_poll);

1633

}

1634

errno = old_errno;

1635

}

1636

1637

__attribute__((nonnull, warn_unused_result))

1638

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

1639

int ret;

1640

int old_errno;

1641

1642

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

1643

if(s < 0){

1644

old_errno = errno;

1645

perror_plus("socket");

1646

errno = old_errno;

1647

return false;

1648

}

1649

strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);

1650

ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */

1651

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1652

if(ret == -1){

1653

if(debug){

1654

old_errno = errno;

1655

perror_plus("ioctl SIOCGIFFLAGS");

1656

errno = old_errno;

1657

}

1658

return false;

1659

}

1660

return true;

1661

}

1662

1663

__attribute__((nonnull, warn_unused_result))

1664

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

1665

1666

/* Reject the loopback device */

1667

if(ifr->ifr_flags & IFF_LOOPBACK){

1668

if(debug){

1669

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

1670

ifname);

1671

}

1672

return false;

1673

}

1674

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

1675

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

1676

if(debug){

1677

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

1678

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

1679

}

1680

return true;

1681

}

1682

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

1683

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

1684

if(debug){

1685

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1686

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

1687

}

1688

return false;

1689

}

1690

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

1691

if(ifr->ifr_flags & IFF_NOARP){

1692

if(debug){

1693

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

1694

ifname);

1695

}

1696

return false;

1697

}

1698

1699

/* Accept this device */

1700

if(debug){

1701

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

1702

}

1703

return true;

1704

}

1705

1706

/*

1707

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

1708

* corresponds to an acceptable network device.

1709

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

1710

*/

1711

__attribute__((nonnull, warn_unused_result))

1712

int good_interface(const struct dirent *if_entry){

1713

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

1714

return 0;

1715

}

1716

1717

struct ifreq ifr;

1718

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

1719

if(debug){

1720

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

1721

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

1722

}

1723

return 0;

1724

}

1725

1726

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

1727

return 0;

1728

}

1729

return 1;

1730

}

1731

1732

/*

1733

* This function determines if a network interface is up.

1734

*/

1735

__attribute__((nonnull, warn_unused_result))

1736

bool interface_is_up(const char *interface){

1737

struct ifreq ifr;

1738

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

1739

if(debug){

1740

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

1741

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

1742

}

1743

return false;

1744

}

1745

1746

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

1747

}

1748

1749

/*

1750

* This function determines if a network interface is running

1751

*/

1752

__attribute__((nonnull, warn_unused_result))

1753

bool interface_is_running(const char *interface){

1754

struct ifreq ifr;

1755

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

1756

if(debug){

1757

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

1758

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

1759

}

1760

return false;

1761

}

1762

1763

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

1764

}

1765

1766

__attribute__((nonnull, pure, warn_unused_result))

1767

int notdotentries(const struct dirent *direntry){

1768

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

1769

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

1770

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

1771

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

1772

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

1773

return 0;

1774

}

1775

return 1;

1776

}

1777

1778

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

1779

__attribute__((nonnull, warn_unused_result))

1780

int runnable_hook(const struct dirent *direntry){

1781

int ret;

1782

size_t sret;

1783

struct stat st;

1784

1785

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

1786

/* Empty name? */

1787

return 0;

1788

}

1789

1790

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

1791

"abcdefghijklmnopqrstuvwxyz"

1792

"0123456789"

1793

"_.-");

1794

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

1795

/* Contains non-allowed characters */

1796

if(debug){

1797

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

1798

direntry->d_name);

1799

}

1800

return 0;

1801

}

1802

1803

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

1804

if(ret == -1){

1805

if(debug){

1806

perror_plus("Could not stat hook");

1807

}

1808

return 0;

1809

}

1810

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

1811

/* Not a regular file */

1812

if(debug){

1813

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

1814

direntry->d_name);

1815

}

1816

return 0;

1817

}

1818

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

1819

/* Not executable */

1820

if(debug){

1821

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

1822

direntry->d_name);

1823

}

1824

return 0;

1825

}

1826

if(debug){

1827

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

1828

direntry->d_name);

1829

}

1830

return 1;

1831

}

1832

1833

__attribute__((nonnull, warn_unused_result))

1834

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1835

mandos_context *mc){

1836

int ret;

1837

struct timespec now;

1838

struct timespec waited_time;

1839

intmax_t block_time;

1840

1841

while(true){

1842

if(mc->current_server == NULL){

1843

if(debug){

1844

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

1845

" No timeout!\n");

1846

}

1847

ret = avahi_simple_poll_iterate(s, -1);

1848

} else {

1849

if(debug){

1850

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

1851

" it, or wait\n");

1852

}

1853

/* the current time */

1854

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1855

if(ret == -1){

1856

perror_plus("clock_gettime");

1857

return -1;

1858

}

1859

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

1860

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

1861

waited_time.tv_sec = (now.tv_sec

1862

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

1863

waited_time.tv_nsec = (now.tv_nsec

1864

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

1865

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

1866

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

1867

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

1868

block_time = ((retry_interval

1869

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

1870

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

1871

1872

if(debug){

1873

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

1874

block_time);

1875

}

1876

1877

if(block_time <= 0){

1878

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

1879

mc->current_server->port,

1880

mc->current_server->if_index,

1881

mc->current_server->af, mc);

1882

if(ret == 0){

1883

avahi_simple_poll_quit(s);

1884

return 0;

1885

}

1886

ret = clock_gettime(CLOCK_MONOTONIC,

1887

&mc->current_server->last_seen);

1888

if(ret == -1){

1889

perror_plus("clock_gettime");

1890

return -1;

1891

}

1892

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

1893

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

1894

servers, but don't block */

1895

}

1896

1897

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

1898

}

1899

if(ret != 0){

1900

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

1901

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

1902

}

1903

}

1904

}

1905

}

1906

1907

__attribute__((nonnull))

1908

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

1909

const float delay){

1910

struct dirent **direntries = NULL;

1911

if(hookdir_fd == -1){

1912

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1913

| O_CLOEXEC);

1914

if(hookdir_fd == -1){

1915

if(errno == ENOENT){

1916

if(debug){

1917

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

1918

" found\n", hookdir);

1919

}

1920

} else {

1921

perror_plus("open");

1922

}

1923

return;

1924

}

1925

}

1926

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

1927

runnable_hook, alphasort);

1928

if(numhooks == -1){

1929

perror_plus("scandir");

1930

return;

1931

}

1932

struct dirent *direntry;

1933

int ret;

1934

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

1935

if(devnull == -1){

1936

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

1937

return;

1938

}

1939

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

1940

direntry = direntries[i];

1941

if(debug){

1942

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

1943

direntry->d_name);

1944

}

1945

pid_t hook_pid = fork();

1946

if(hook_pid == 0){

1947

/* Child */

1948

/* Raise privileges */

1949

errno = raise_privileges_permanently();

1950

if(errno != 0){

1951

perror_plus("Failed to raise privileges");

1952

_exit(EX_NOPERM);

1953

}

1954

/* Set group */

1955

errno = 0;

1956

ret = setgid(0);

1957

if(ret == -1){

1958

perror_plus("setgid");

1959

_exit(EX_NOPERM);

1960

}

1961

/* Reset supplementary groups */

1962

errno = 0;

1963

ret = setgroups(0, NULL);

1964

if(ret == -1){

1965

perror_plus("setgroups");

1966

_exit(EX_NOPERM);

1967

}

1968

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

1969

if(ret == -1){

1970

perror_plus("setenv");

1971

_exit(EX_OSERR);

1972

}

1973

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

1974

if(ret == -1){

1975

perror_plus("setenv");

1976

_exit(EX_OSERR);

1977

}

1978

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

1979

if(ret == -1){

1980

perror_plus("setenv");

1981

_exit(EX_OSERR);

1982

}

1983

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

1984

if(ret == -1){

1985

perror_plus("setenv");

1986

_exit(EX_OSERR);

1987

}

1988

char *delaystring;

1989

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

1990

if(ret == -1){

1991

perror_plus("asprintf");

1992

_exit(EX_OSERR);

1993

}

1994

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

1995

if(ret == -1){

1996

free(delaystring);

1997

perror_plus("setenv");

1998

_exit(EX_OSERR);

1999

}

2000

free(delaystring);

2001

if(connect_to != NULL){

2002

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

2003

if(ret == -1){

2004

perror_plus("setenv");

2005

_exit(EX_OSERR);

2006

}

2007

}

2008

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

2009

direntry->d_name,

2010

O_RDONLY));

2011

if(hook_fd == -1){

2012

perror_plus("openat");

2013

_exit(EXIT_FAILURE);

2014

}

2015

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

2016

perror_plus("close");

2017

_exit(EXIT_FAILURE);

2018

}

2019

ret = dup2(devnull, STDIN_FILENO);

2020

if(ret == -1){

2021

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

2022

_exit(EX_OSERR);

2023

}

2024

ret = close(devnull);

2025

if(ret == -1){

2026

perror_plus("close");

2027

_exit(EX_OSERR);

2028

}

2029

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2030

if(ret == -1){

2031

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

2032

_exit(EX_OSERR);

2033

}

2034

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

2035

environ) == -1){

2036

perror_plus("fexecve");

2037

_exit(EXIT_FAILURE);

2038

}

2039

} else {

2040

if(hook_pid == -1){

2041

perror_plus("fork");

2042

free(direntry);

2043

continue;

2044

}

2045

int status;

2046

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

2047

perror_plus("waitpid");

2048

free(direntry);

2049

continue;

2050

}

2051

if(WIFEXITED(status)){

2052

if(WEXITSTATUS(status) != 0){

2053

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

2054

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

2055

WEXITSTATUS(status));

2056

free(direntry);

2057

continue;

2058

}

2059

} else if(WIFSIGNALED(status)){

2060

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

2061

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

2062

WTERMSIG(status));

2063

free(direntry);

2064

continue;

2065

} else {

2066

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

2067

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

2068

free(direntry);

2069

continue;

2070

}

2071

}

2072

if(debug){

2073

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

2074

direntry->d_name);

2075

}

2076

free(direntry);

2077

}

2078

free(direntries);

2079

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

2080

perror_plus("close");

2081

} else {

2082

hookdir_fd = -1;

2083

}

2084

close(devnull);

2085

}

2086

2087

__attribute__((nonnull, warn_unused_result))

2088

int bring_up_interface(const char *const interface,

2089

const float delay){

2090

int old_errno = errno;

2091

int ret;

2092

struct ifreq network;

2093

unsigned int if_index = if_nametoindex(interface);

2094

if(if_index == 0){

2095

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

2096

errno = old_errno;

2097

return ENXIO;

2098

}

2099

2100

if(quit_now){

2101

errno = old_errno;

2102

return EINTR;

2103

}

2104

2105

if(not interface_is_up(interface)){

2106

int ret_errno = 0;

2107

int ioctl_errno = 0;

2108

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

2109

ret_errno = errno;

2110

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

2111

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

2112

errno = old_errno;

2113

return ret_errno;

2114

}

2115

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

2116

2117

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

2118

if(sd == -1){

2119

ret_errno = errno;

2120

perror_plus("socket");

2121

errno = old_errno;

2122

return ret_errno;

2123

}

2124

2125

if(quit_now){

2126

ret = close(sd);

2127

if(ret == -1){

2128

perror_plus("close");

2129

}

2130

errno = old_errno;

2131

return EINTR;

2132

}

2133

2134

if(debug){

2135

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

2136

interface);

2137

}

2138

2139

/* Raise privileges */

2140

ret_errno = raise_privileges();

2141

if(ret_errno != 0){

2142

errno = ret_errno;

2143

perror_plus("Failed to raise privileges");

2144

}

2145

2146

#ifdef __linux__

2147

int ret_linux;

2148

bool restore_loglevel = false;

2149

if(ret_errno == 0){

2150

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2151

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

2152

ret_linux = klogctl(8, NULL, 5);

2153

if(ret_linux == -1){

2154

perror_plus("klogctl");

2155

} else {

2156

restore_loglevel = true;

2157

}

2158

}

2159

#endif /* __linux__ */

2160

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

2161

ioctl_errno = errno;

2162

#ifdef __linux__

2163

if(restore_loglevel){

2164

ret_linux = klogctl(7, NULL, 0);

2165

if(ret_linux == -1){

2166

perror_plus("klogctl");

2167

}

2168

}

2169

#endif /* __linux__ */

2170

2171

/* If raise_privileges() succeeded above */

2172

if(ret_errno == 0){

2173

/* Lower privileges */

2174

ret_errno = lower_privileges();

2175

if(ret_errno != 0){

2176

errno = ret_errno;

2177

perror_plus("Failed to lower privileges");

2178

}

2179

}

2180

2181

/* Close the socket */

2182

ret = close(sd);

2183

if(ret == -1){

2184

perror_plus("close");

2185

}

2186

2187

if(ret_setflags == -1){

2188

errno = ioctl_errno;

2189

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2190

errno = old_errno;

2191

return ioctl_errno;

2192

}

2193

} else if(debug){

2194

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

2195

interface);

2196

}

2197

2198

/* Sleep checking until interface is running.

2199

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

2200

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

2201

if(interface_is_running(interface)){

2202

break;

2203

}

2204

struct timespec sleeptime = { .tv_nsec = 250000000 };

2205

ret = nanosleep(&sleeptime, NULL);

2206

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

2207

perror_plus("nanosleep");

2208

}

2209

}

2210

2211

errno = old_errno;

2212

return 0;

2213

}

2214

2215

__attribute__((nonnull, warn_unused_result))

2216

int take_down_interface(const char *const interface){

2217

int old_errno = errno;

2218

struct ifreq network;

2219

unsigned int if_index = if_nametoindex(interface);

2220

if(if_index == 0){

2221

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

2222

errno = old_errno;

2223

return ENXIO;

2224

}

2225

if(interface_is_up(interface)){

2226

int ret_errno = 0;

2227

int ioctl_errno = 0;

2228

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

2229

ret_errno = errno;

2230

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

2231

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

2232

errno = old_errno;

2233

return ret_errno;

2234

}

2235

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

2236

2237

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

2238

if(sd == -1){

2239

ret_errno = errno;

2240

perror_plus("socket");

2241

errno = old_errno;

2242

return ret_errno;

2243

}

2244

2245

if(debug){

2246

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

2247

interface);

2248

}

2249

2250

/* Raise privileges */

2251

ret_errno = raise_privileges();

2252

if(ret_errno != 0){

2253

errno = ret_errno;

2254

perror_plus("Failed to raise privileges");

2255

}

2256

2257

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

2258

ioctl_errno = errno;

2259

2260

/* If raise_privileges() succeeded above */

2261

if(ret_errno == 0){

2262

/* Lower privileges */

2263

ret_errno = lower_privileges();

2264

if(ret_errno != 0){

2265

errno = ret_errno;

2266

perror_plus("Failed to lower privileges");

2267

}

2268

}

2269

2270

/* Close the socket */

2271

int ret = close(sd);

2272

if(ret == -1){

2273

perror_plus("close");

2274

}

2275

2276

if(ret_setflags == -1){

2277

errno = ioctl_errno;

2278

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2279

errno = old_errno;

2280

return ioctl_errno;

2281

}

2282

} else if(debug){

2283

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

2284

interface);

2285

}

2286

2287

errno = old_errno;

2288

return 0;

1017

if(mc.simple_poll != NULL){

1018

avahi_simple_poll_quit(mc.simple_poll);

1019

}

1020

errno = old_errno;

2289

1021

}

2290

1022

2291

1023

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

2292

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

2293

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

2294

":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",

2295

.current_server = NULL, .interfaces = NULL,

2296

.interfaces_size = 0 };

2297

1024

AvahiSServiceBrowser *sb = NULL;

2298

error_t ret_errno;

1025

int error;

2299

1026

int ret;

2300

1027

intmax_t tmpmax;

2301

1028

char *tmp;

2302

1029

int exitcode = EXIT_SUCCESS;

2303

char *interfaces_to_take_down = NULL;

2304

size_t interfaces_to_take_down_size = 0;

2305

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

2306

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

2307

char *tempdir = NULL;

1030

const char *interface = "eth0";

1031

struct ifreq network;

1032

int sd = -1;

1033

bool take_down_interface = false;

1034

uid_t uid;

1035

gid_t gid;

1036

char *connect_to = NULL;

1037

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

1038

bool tempdir_created = false;

2308

1039

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2309

1040

const char *seckey = PATHDIR "/" SECKEY;

2310

1041

const char *pubkey = PATHDIR "/" PUBKEY;

2311

const char *dh_params_file = NULL;

2312

char *interfaces_hooks = NULL;

2313

1042

2314

1043

bool gnutls_initialized = false;

2315

1044

bool gpgme_initialized = false;

2316

1045

float delay = 2.5f;

2317

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

2318

retrying the same server again */

2319

1046

2320

1047

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

2321

1048

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

2327

1054

errno = 0;

2328

1055

ret = setgid(gid);

2329

1056

if(ret == -1){

2330

perror_plus("setgid");

1057

perror("setgid");

2331

1058

}

2332

1059

2333

1060

/* Lower user privileges (temporarily) */

2334

1061

errno = 0;

2335

1062

ret = seteuid(uid);

2336

1063

if(ret == -1){

2337

perror_plus("seteuid");

1064

perror("seteuid");

2338

1065

}

2339

1066

2340

1067

if(quit_now){

2367

1094

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

2368

1095

" Diffie-Hellman key exchange",

2369

1096

.group = 2 },

2370

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

2371

.arg = "FILE",

2372

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

2373

" for the Diffie-Hellman key exchange",

2374

.group = 2 },

2375

1097

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

2376

1098

.arg = "STRING",

2377

1099

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

2380

1102

.arg = "SECONDS",

2381

1103

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

2382

1104

.group = 2 },

2383

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

2384

.arg = "SECONDS",

2385

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

2386

.group = 2 },

2387

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

2388

.arg = "DIR",

2389

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

2390

.group = 2 },

2391

1105

/*

2392

1106

* These reproduce what we would get without ARGP_NO_HELP

2393

1107

*/

2411

1125

connect_to = arg;

2412

1126

break;

2413

1127

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

2414

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

2415

arg, (int)',');

2416

if(ret_errno != 0){

2417

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

2418

}

1128

interface = arg;

2419

1129

break;

2420

1130

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

2421

1131

seckey = arg;

2432

1142

}

2433

1143

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

2434

1144

break;

2435

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

2436

dh_params_file = arg;

2437

break;

2438

1145

case 130: /* --priority */

2439

1146

mc.priority = arg;

2440

1147

break;

2444

1151

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

2445

1152

argp_error(state, "Bad delay");

2446

1153

}

2447

case 132: /* --retry */

2448

errno = 0;

2449

retry_interval = strtod(arg, &tmp);

2450

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

2451

or (retry_interval * 1000) > INT_MAX

2452

or retry_interval < 0){

2453

argp_error(state, "Bad retry interval");

2454

}

2455

break;

2456

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

2457

hookdir = arg;

2458

1154

break;

2459

1155

/*

2460

1156

* These reproduce what we would get without ARGP_NO_HELP

2467

1163

argp_state_help(state, state->out_stream,

2468

1164

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

2469

1165

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

2470

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

1166

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

2471

1167

exit(argp_err_exit_status);

2472

1168

break;

2473

1169

default:

2480

1176

.args_doc = "",

2481

1177

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

2482

1178

" passwords from a Mandos server" };

2483

ret_errno = argp_parse(&argp, argc, argv,

2484

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2485

switch(ret_errno){

1179

ret = argp_parse(&argp, argc, argv,

1180

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1181

switch(ret){

2486

1182

case 0:

2487

1183

break;

2488

1184

case ENOMEM:

2489

1185

default:

2490

errno = ret_errno;

2491

perror_plus("argp_parse");

1186

errno = ret;

1187

perror("argp_parse");

2492

1188

exitcode = EX_OSERR;

2493

1189

goto end;

2494

1190

case EINVAL:

2497

1193

}

2498

1194

}

2499

1195

2500

{

2501

/* Work around Debian bug #633582:

2502

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

2503

2504

/* Re-raise privileges */

2505

ret = raise_privileges();

2506

if(ret != 0){

2507

errno = ret;

2508

perror_plus("Failed to raise privileges");

2509

} else {

2510

struct stat st;

2511

2512

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

2513

int seckey_fd = open(seckey, O_RDONLY);

2514

if(seckey_fd == -1){

2515

perror_plus("open");

2516

} else {

2517

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

2518

if(ret == -1){

2519

perror_plus("fstat");

2520

} else {

2521

if(S_ISREG(st.st_mode)

2522

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

2523

ret = fchown(seckey_fd, uid, gid);

2524

if(ret == -1){

2525

perror_plus("fchown");

2526

}

2527

}

2528

}

2529

close(seckey_fd);

2530

}

2531

}

2532

2533

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

2534

int pubkey_fd = open(pubkey, O_RDONLY);

2535

if(pubkey_fd == -1){

2536

perror_plus("open");

2537

} else {

2538

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

2539

if(ret == -1){

2540

perror_plus("fstat");

2541

} else {

2542

if(S_ISREG(st.st_mode)

2543

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

2544

ret = fchown(pubkey_fd, uid, gid);

2545

if(ret == -1){

2546

perror_plus("fchown");

2547

}

2548

}

2549

}

2550

close(pubkey_fd);

2551

}

2552

}

2553

2554

if(dh_params_file != NULL

2555

and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){

2556

int dhparams_fd = open(dh_params_file, O_RDONLY);

2557

if(dhparams_fd == -1){

2558

perror_plus("open");

2559

} else {

2560

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

2561

if(ret == -1){

2562

perror_plus("fstat");

2563

} else {

2564

if(S_ISREG(st.st_mode)

2565

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

2566

ret = fchown(dhparams_fd, uid, gid);

2567

if(ret == -1){

2568

perror_plus("fchown");

2569

}

2570

}

2571

}

2572

close(dhparams_fd);

2573

}

2574

}

2575

2576

/* Lower privileges */

2577

ret = lower_privileges();

2578

if(ret != 0){

2579

errno = ret;

2580

perror_plus("Failed to lower privileges");

2581

}

2582

}

2583

}

2584

2585

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

2586

{

2587

char *interface = NULL;

2588

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

2589

interface))){

2590

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

2591

and if_nametoindex(interface) == 0){

2592

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

2593

fprintf_plus(stderr, "Not using nonexisting interface"

2594

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

2595

}

2596

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

2597

interface = NULL;

2598

}

2599

}

2600

}

2601

2602

/* Run network hooks */

2603

{

2604

if(mc.interfaces != NULL){

2605

interfaces_hooks = malloc(mc.interfaces_size);

2606

if(interfaces_hooks == NULL){

2607

perror_plus("malloc");

2608

goto end;

2609

}

2610

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

2611

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

2612

}

2613

run_network_hooks("start", interfaces_hooks != NULL ?

2614

interfaces_hooks : "", delay);

2615

}

2616

2617

1196

if(not debug){

2618

1197

avahi_set_log_function(empty_log);

2619

1198

}

2622

1201

from the signal handler */

2623

1202

/* Initialize the pseudo-RNG for Avahi */

2624

1203

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

2625

simple_poll = avahi_simple_poll_new();

2626

if(simple_poll == NULL){

2627

fprintf_plus(stderr,

2628

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

1204

mc.simple_poll = avahi_simple_poll_new();

1205

if(mc.simple_poll == NULL){

1206

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

2629

1207

exitcode = EX_UNAVAILABLE;

2630

1208

goto end;

2631

1209

}

2633

1211

sigemptyset(&sigterm_action.sa_mask);

2634

1212

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

2635

1213

if(ret == -1){

2636

perror_plus("sigaddset");

1214

perror("sigaddset");

2637

1215

exitcode = EX_OSERR;

2638

1216

goto end;

2639

1217

}

2640

1218

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

2641

1219

if(ret == -1){

2642

perror_plus("sigaddset");

1220

perror("sigaddset");

2643

1221

exitcode = EX_OSERR;

2644

1222

goto end;

2645

1223

}

2646

1224

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

2647

1225

if(ret == -1){

2648

perror_plus("sigaddset");

1226

perror("sigaddset");

2649

1227

exitcode = EX_OSERR;

2650

1228

goto end;

2651

1229

}

2655

1233

*/

2656

1234

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

2657

1235

if(ret == -1){

2658

perror_plus("sigaction");

1236

perror("sigaction");

2659

1237

return EX_OSERR;

2660

1238

}

2661

1239

if(old_sigterm_action.sa_handler != SIG_IGN){

2662

1240

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

2663

1241

if(ret == -1){

2664

perror_plus("sigaction");

1242

perror("sigaction");

2665

1243

exitcode = EX_OSERR;

2666

1244

goto end;

2667

1245

}

2668

1246

}

2669

1247

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

2670

1248

if(ret == -1){

2671

perror_plus("sigaction");

1249

perror("sigaction");

2672

1250

return EX_OSERR;

2673

1251

}

2674

1252

if(old_sigterm_action.sa_handler != SIG_IGN){

2675

1253

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

2676

1254

if(ret == -1){

2677

perror_plus("sigaction");

1255

perror("sigaction");

2678

1256

exitcode = EX_OSERR;

2679

1257

goto end;

2680

1258

}

2681

1259

}

2682

1260

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

2683

1261

if(ret == -1){

2684

perror_plus("sigaction");

1262

perror("sigaction");

2685

1263

return EX_OSERR;

2686

1264

}

2687

1265

if(old_sigterm_action.sa_handler != SIG_IGN){

2688

1266

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

2689

1267

if(ret == -1){

2690

perror_plus("sigaction");

1268

perror("sigaction");

2691

1269

exitcode = EX_OSERR;

2692

1270

goto end;

2693

1271

}

2694

1272

}

2695

1273

2696

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

2697

if(mc.interfaces == NULL){

2698

struct dirent **direntries = NULL;

2699

/* Look for any good interfaces */

2700

ret = scandir(sys_class_net, &direntries, good_interface,

2701

alphasort);

2702

if(ret >= 1){

2703

/* Add all found interfaces to interfaces list */

2704

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

2705

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

2706

direntries[i]->d_name);

2707

if(ret_errno != 0){

2708

errno = ret_errno;

2709

perror_plus("argz_add");

2710

free(direntries[i]);

2711

continue;

2712

}

2713

if(debug){

2714

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

2715

direntries[i]->d_name);

2716

}

2717

free(direntries[i]);

2718

}

2719

free(direntries);

1274

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

1275

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

1276

if_index = (AvahiIfIndex) if_nametoindex(interface);

1277

if(if_index == 0){

1278

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

1279

exitcode = EX_UNAVAILABLE;

1280

goto end;

1281

}

1282

1283

if(quit_now){

1284

goto end;

1285

}

1286

1287

/* Re-raise priviliges */

1288

errno = 0;

1289

ret = seteuid(0);

1290

if(ret == -1){

1291

perror("seteuid");

1292

}

1293

1294

#ifdef __linux__

1295

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1296

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

1297

ret = klogctl(8, NULL, 5);

1298

bool restore_loglevel = true;

1299

if(ret == -1){

1300

restore_loglevel = false;

1301

perror("klogctl");

1302

}

1303

#endif /* __linux__ */

1304

1305

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1306

if(sd < 0){

1307

perror("socket");

1308

exitcode = EX_OSERR;

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

strcpy(network.ifr_name, interface);

1326

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

1327

if(ret == -1){

1328

perror("ioctl SIOCGIFFLAGS");

1329

#ifdef __linux__

1330

if(restore_loglevel){

1331

ret = klogctl(7, NULL, 0);

1332

if(ret == -1){

1333

perror("klogctl");

1334

}

1335

}

1336

#endif /* __linux__ */

1337

exitcode = EX_OSERR;

1338

/* Lower privileges */

1339

errno = 0;

1340

ret = seteuid(uid);

1341

if(ret == -1){

1342

perror("seteuid");

1343

}

1344

goto end;

1345

}

1346

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

1347

network.ifr_flags |= IFF_UP;

1348

take_down_interface = true;

1349

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

1350

if(ret == -1){

1351

take_down_interface = false;

1352

perror("ioctl SIOCSIFFLAGS");

1353

exitcode = EX_OSERR;

1354

#ifdef __linux__

1355

if(restore_loglevel){

1356

ret = klogctl(7, NULL, 0);

1357

if(ret == -1){

1358

perror("klogctl");

1359

}

1360

}

1361

#endif /* __linux__ */

1362

/* Lower privileges */

1363

errno = 0;

1364

ret = seteuid(uid);

1365

if(ret == -1){

1366

perror("seteuid");

1367

}

1368

goto end;

1369

}

1370

}

1371

/* sleep checking until interface is running */

1372

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

1373

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

1374

if(ret == -1){

1375

perror("ioctl SIOCGIFFLAGS");

1376

} else if(network.ifr_flags & IFF_RUNNING){

1377

break;

1378

}

1379

struct timespec sleeptime = { .tv_nsec = 250000000 };

1380

ret = nanosleep(&sleeptime, NULL);

1381

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

1382

perror("nanosleep");

1383

}

1384

}

1385

if(not take_down_interface){

1386

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

1387

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

1388

if(ret == -1){

1389

perror("close");

1390

}

1391

}

1392

#ifdef __linux__

1393

if(restore_loglevel){

1394

/* Restores kernel loglevel to default */

1395

ret = klogctl(7, NULL, 0);

1396

if(ret == -1){

1397

perror("klogctl");

1398

}

1399

}

1400

#endif /* __linux__ */

1401

/* Lower privileges */

1402

errno = 0;

1403

if(take_down_interface){

1404

/* Lower privileges */

1405

ret = seteuid(uid);

1406

if(ret == -1){

1407

perror("seteuid");

1408

}

2720

1409

} else {

2721

if(ret == 0){

2722

free(direntries);

2723

}

2724

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

2725

exitcode = EXIT_FAILURE;

2726

goto end;

2727

}

2728

}

2729

2730

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

2731

{

2732

char *interface = NULL;

2733

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

2734

interface))){

2735

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

2736

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

2737

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

2738

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

2739

interface);

2740

interface = NULL;

2741

while((interface = argz_next(mc.interfaces,

2742

mc.interfaces_size, interface))){

2743

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

2744

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

2745

interface);

2746

interface = NULL;

2747

}

2748

}

2749

break;

2750

}

2751

bool interface_was_up = interface_is_up(interface);

2752

errno = bring_up_interface(interface, delay);

2753

if(not interface_was_up){

2754

if(errno != 0){

2755

fprintf_plus(stderr, "Failed to bring up interface \"%s\":"

2756

" %s\n", interface, strerror(errno));

2757

} else {

2758

errno = argz_add(&interfaces_to_take_down,

2759

&interfaces_to_take_down_size,

2760

interface);

2761

if(errno != 0){

2762

perror_plus("argz_add");

2763

}

2764

}

2765

}

2766

}

2767

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

2768

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

2769

}

2770

}

2771

2772

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

2773

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

2774

if(debug){

2775

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

2776

mc.interfaces);

2777

}

2778

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

1410

/* Lower privileges permanently */

1411

ret = setuid(uid);

1412

if(ret == -1){

1413

perror("setuid");

1414

}

1415

}

2779

1416

}

2780

1417

2781

1418

if(quit_now){

2782

1419

goto end;

2783

1420

}

2784

1421

2785

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

1422

ret = init_gnutls_global(pubkey, seckey);

2786

1423

if(ret == -1){

2787

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

1424

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

2788

1425

exitcode = EX_UNAVAILABLE;

2789

1426

goto end;

2790

1427

} else {

2795

1432

goto end;

2796

1433

}

2797

1434

2798

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

2799

tempdir = mkdtemp(run_tempdir);

2800

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

2801

if(debug){

2802

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

2803

run_tempdir, old_tempdir);

2804

}

2805

tempdir = mkdtemp(old_tempdir);

2806

}

2807

if(tempdir == NULL){

2808

perror_plus("mkdtemp");

1435

tempdir_created = true;

1436

if(mkdtemp(tempdir) == NULL){

1437

tempdir_created = false;

1438

perror("mkdtemp");

2809

1439

goto end;

2810

1440

}

2811

1441

2813

1443

goto end;

2814

1444

}

2815

1445

2816

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

2817

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

1446

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

1447

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

2818

1448

exitcode = EX_UNAVAILABLE;

2819

1449

goto end;

2820

1450

} else {

2829

1459

/* Connect directly, do not use Zeroconf */

2830

1460

/* (Mainly meant for debugging) */

2831

1461

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

2832

2833

1462

if(address == NULL){

2834

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

1463

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

2835

1464

exitcode = EX_USAGE;

2836

1465

goto end;

2837

1466

}

2840

1469

goto end;

2841

1470

}

2842

1471

2843

in_port_t port;

1472

uint16_t port;

2844

1473

errno = 0;

2845

1474

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

2846

1475

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

2847

or tmpmax != (in_port_t)tmpmax){

2848

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

1476

or tmpmax != (uint16_t)tmpmax){

1477

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

2849

1478

exitcode = EX_USAGE;

2850

1479

goto end;

2851

1480

}

2852

1481

2853

1482

if(quit_now){

2854

1483

goto end;

2855

1484

}

2856

1485

2857

port = (in_port_t)tmpmax;

1486

port = (uint16_t)tmpmax;

2858

1487

*address = '\0';

1488

address = connect_to;

2859

1489

/* Colon in address indicates IPv6 */

2860

1490

int af;

2861

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

1491

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

2862

1492

af = AF_INET6;

2863

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

2864

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

2865

{

2866

connect_to++;

2867

address[-1] = '\0';

2868

}

2869

1493

} else {

2870

1494

af = AF_INET;

2871

1495

}

2872

address = connect_to;

2873

1496

2874

1497

if(quit_now){

2875

1498

goto end;

2876

1499

}

2877

1500

2878

while(not quit_now){

2879

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

2880

&mc);

2881

if(quit_now or ret == 0){

2882

break;

2883

}

2884

if(debug){

2885

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

2886

(int)retry_interval);

2887

}

2888

sleep((unsigned int)retry_interval);

2889

}

2890

2891

if(not quit_now){

1501

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

1502

if(ret < 0){

1503

switch(errno){

1504

case ENETUNREACH:

1505

case EHOSTDOWN:

1506

case EHOSTUNREACH:

1507

exitcode = EX_NOHOST;

1508

break;

1509

case EINVAL:

1510

exitcode = EX_USAGE;

1511

break;

1512

case EIO:

1513

exitcode = EX_IOERR;

1514

break;

1515

case EPROTO:

1516

exitcode = EX_PROTOCOL;

1517

break;

1518

default:

1519

exitcode = EX_OSERR;

1520

break;

1521

}

1522

} else {

2892

1523

exitcode = EXIT_SUCCESS;

2893

1524

}

2894

2895

1525

goto end;

2896

1526

}

2897

1527

2909

1539

config.publish_domain = 0;

2910

1540

2911

1541

/* Allocate a new server */

2912

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2913

&config, NULL, NULL, &ret);

1542

mc.server = avahi_server_new(avahi_simple_poll_get

1543

(mc.simple_poll), &config, NULL,

1544

NULL, &error);

2914

1545

2915

1546

/* Free the Avahi configuration data */

2916

1547

avahi_server_config_free(&config);

2918

1549

2919

1550

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

2920

1551

if(mc.server == NULL){

2921

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

2922

avahi_strerror(ret));

1552

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

1553

avahi_strerror(error));

2923

1554

exitcode = EX_UNAVAILABLE;

2924

1555

goto end;

2925

1556

}

2931

1562

/* Create the Avahi service browser */

2932

1563

sb = avahi_s_service_browser_new(mc.server, if_index,

2933

1564

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2934

NULL, 0, browse_callback,

2935

(void *)&mc);

1565

NULL, 0, browse_callback, NULL);

2936

1566

if(sb == NULL){

2937

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

2938

avahi_strerror(avahi_server_errno(mc.server)));

1567

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

1568

avahi_strerror(avahi_server_errno(mc.server)));

2939

1569

exitcode = EX_UNAVAILABLE;

2940

1570

goto end;

2941

1571

}

2947

1577

/* Run the main loop */

2948

1578

2949

1579

if(debug){

2950

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

1580

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

2951

1581

}

2952

1582

2953

ret = avahi_loop_with_timeout(simple_poll,

2954

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

2955

if(debug){

2956

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

2957

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

2958

}

1583

avahi_simple_poll_loop(mc.simple_poll);

2959

1584

2960

1585

end:

2961

1586

2962

1587

if(debug){

2963

if(signal_received){

2964

fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",

2965

argv[0], signal_received,

2966

strsignal(signal_received));

2967

} else {

2968

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

2969

}

1588

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

2970

1589

}

2971

1590

2972

1591

/* Cleanup things */

2973

free(mc.interfaces);

2974

2975

1592

if(sb != NULL)

2976

1593

avahi_s_service_browser_free(sb);

2977

1594

2978

1595

if(mc.server != NULL)

2979

1596

avahi_server_free(mc.server);

2980

1597

2981

if(simple_poll != NULL)

2982

avahi_simple_poll_free(simple_poll);

1598

if(mc.simple_poll != NULL)

1599

avahi_simple_poll_free(mc.simple_poll);

2983

1600

2984

1601

if(gnutls_initialized){

2985

1602

gnutls_certificate_free_credentials(mc.cred);

1603

gnutls_global_deinit();

2986

1604

gnutls_dh_params_deinit(mc.dh_params);

2987

1605

}

2988

1606

2990

1608

gpgme_release(mc.ctx);

2991

1609

}

2992

1610

2993

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

2994

has seen */

2995

if(mc.current_server != NULL){

2996

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

2997

while(mc.current_server != NULL){

2998

server *next = mc.current_server->next;

2999

#ifdef __GNUC__

3000

#pragma GCC diagnostic push

3001

#pragma GCC diagnostic ignored "-Wcast-qual"

3002

#endif

3003

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

3004

#ifdef __GNUC__

3005

#pragma GCC diagnostic pop

3006

#endif

3007

free(mc.current_server);

3008

mc.current_server = next;

3009

}

3010

}

3011

3012

/* Re-raise privileges */

3013

{

3014

ret = raise_privileges();

3015

if(ret != 0){

3016

errno = ret;

3017

perror_plus("Failed to raise privileges");

3018

} else {

3019

3020

/* Run network hooks */

3021

run_network_hooks("stop", interfaces_hooks != NULL ?

3022

interfaces_hooks : "", delay);

3023

3024

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

3025

{

3026

char *interface = NULL;

3027

while((interface = argz_next(interfaces_to_take_down,

3028

interfaces_to_take_down_size,

3029

interface))){

3030

ret = take_down_interface(interface);

3031

if(ret != 0){

3032

errno = ret;

3033

perror_plus("Failed to take down interface");

3034

}

3035

}

3036

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

3037

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

3038

" down\n");

3039

}

3040

}

3041

}

3042

3043

ret = lower_privileges_permanently();

3044

if(ret != 0){

3045

errno = ret;

3046

perror_plus("Failed to lower privileges permanently");

3047

}

3048

}

3049

3050

free(interfaces_to_take_down);

3051

free(interfaces_hooks);

3052

3053

void clean_dir_at(int base, const char * const dirname,

3054

uintmax_t level){

3055

struct dirent **direntries = NULL;

3056

int dret;

3057

int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,

3058

O_RDONLY

3059

| O_NOFOLLOW

3060

| O_DIRECTORY

3061

| O_PATH));

3062

if(dir_fd == -1){

3063

perror_plus("open");

3064

}

3065

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

3066

notdotentries, alphasort);

3067

if(numentries >= 0){

3068

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

3069

if(debug){

3070

fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",

3071

dirname, direntries[i]->d_name);

3072

}

3073

dret = unlinkat(dir_fd, direntries[i]->d_name, 0);

3074

if(dret == -1){

3075

if(errno == EISDIR){

3076

dret = unlinkat(dir_fd, direntries[i]->d_name,

3077

AT_REMOVEDIR);

3078

}

3079

if((dret == -1) and (errno == ENOTEMPTY)

3080

and (strcmp(direntries[i]->d_name, "private-keys-v1.d")

3081

== 0) and (level == 0)){

3082

/* Recurse only in this special case */

3083

clean_dir_at(dir_fd, direntries[i]->d_name, level+1);

3084

dret = 0;

3085

}

3086

if(dret == -1){

3087

fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,

3088

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

3089

}

3090

}

3091

free(direntries[i]);

3092

}

3093

3094

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

3095

free(direntries);

3096

if(numentries == -1){

3097

perror_plus("scandirat");

3098

}

3099

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3100

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

3101

perror_plus("rmdir");

3102

}

3103

} else {

3104

perror_plus("scandirat");

3105

}

3106

close(dir_fd);

3107

}

3108

3109

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

3110

if(tempdir != NULL){

3111

clean_dir_at(-1, tempdir, 0);

1611

/* Take down the network interface */

1612

if(take_down_interface){

1613

/* Re-raise priviliges */

1614

errno = 0;

1615

ret = seteuid(0);

1616

if(ret == -1){

1617

perror("seteuid");

1618

}

1619

if(geteuid() == 0){

1620

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

1621

if(ret == -1){

1622

perror("ioctl SIOCGIFFLAGS");

1623

} else if(network.ifr_flags & IFF_UP) {

1624

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

1625

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

1626

if(ret == -1){

1627

perror("ioctl SIOCSIFFLAGS");

1628

}

1629

}

1630

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

1631

if(ret == -1){

1632

perror("close");

1633

}

1634

/* Lower privileges permanently */

1635

errno = 0;

1636

ret = setuid(uid);

1637

if(ret == -1){

1638

perror("setuid");

1639

}

1640

}

1641

}

1642

1643

/* Removes the temp directory used by GPGME */

1644

if(tempdir_created){

1645

DIR *d;

1646

struct dirent *direntry;

1647

d = opendir(tempdir);

1648

if(d == NULL){

1649

if(errno != ENOENT){

1650

perror("opendir");

1651

}

1652

} else {

1653

while(true){

1654

direntry = readdir(d);

1655

if(direntry == NULL){

1656

break;

1657

}

1658

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

1659

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

1660

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

1661

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

1662

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

1663

continue;

1664

}

1665

char *fullname = NULL;

1666

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

1667

direntry->d_name);

1668

if(ret < 0){

1669

perror("asprintf");

1670

continue;

1671

}

1672

ret = remove(fullname);

1673

if(ret == -1){

1674

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

1675

strerror(errno));

1676

}

1677

free(fullname);

1678

}

1679

closedir(d);

1680

}

1681

ret = rmdir(tempdir);

1682

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

1683

perror("rmdir");

1684

}

3112

1685

}

3113

1686

3114

1687

if(quit_now){

3118

1691

&old_sigterm_action,

3119

1692

NULL));

3120

1693

if(ret == -1){

3121

perror_plus("sigaction");

1694

perror("sigaction");

3122

1695

}

3123

1696

do {

3124

1697

ret = raise(signal_received);

3125

1698

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

3126

1699

if(ret != 0){

3127

perror_plus("raise");

1700

perror("raise");

3128

1701

abort();

3129

1702

}

3130

1703

TEMP_FAILURE_RETRY(pause());