/mandos/trunk : revision 594.1.2

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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@fukt.bsnet.se>.

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

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*/

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

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

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stdout, ferror(), remove() */

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

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

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

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

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srand(), strtof() */

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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> /* memset(), strcmp(), strlen(),

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

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sockaddr_in6, PF_INET6,

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SOCK_STREAM, uid_t, gid_t, open(),

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opendir(), DIR */

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

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

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

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inet_pton(), connect() */

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

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

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strtoimax() */

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

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

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

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

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program_invocation_short_name */

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

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

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SIOCSIFFLAGS, if_indextoname(),

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if_nametoindex(), IF_NAMESIZE */

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INET_ADDRSTRLEN, INET6_ADDRSTRLEN

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*/

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

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

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setgid() */

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

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

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

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

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

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

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argp_state, struct argp,

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argp_parse(), ARGP_KEY_ARG,

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ARGP_KEY_END, ARGP_ERR_UNKNOWN */

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

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sigaction(), SIGTERM, sigaction,

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sig_atomic_t */

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sigaction(), SIGTERM, sig_atomic_t,

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raise() */

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

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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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

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WEXITSTATUS(), WTERMSIG() */

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

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#ifdef __linux__

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93

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

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111

init_gnutls_session(),

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112

GNUTLS_* */

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113

#include <gnutls/openpgp.h>

108

/* 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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126

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

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127

#define SECKEY "seckey.txt"

122

128

#define PUBKEY "pubkey.txt"

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

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130

124

131

bool debug = false;

125

132

static const char mandos_protocol_version[] = "1";

126

133

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

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

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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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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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uint16_t port;

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AvahiIfIndex if_index;

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int af;

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struct timespec last_seen;

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struct server *next;

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struct server *prev;

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} server;

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

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153

typedef struct {

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158

gnutls_dh_params_t dh_params;

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159

const char *priority;

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160

gpgme_ctx_t ctx;

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server *current_server;

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} mandos_context;

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163

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

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

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166

.dh_bits = 1024, .priority = "SECURE256"

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

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":!CTYPE-X.509:+CTYPE-OPENPGP",

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.current_server = NULL };

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170

sig_atomic_t quit_now = 0;

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int signal_received = 0;

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/* Function to use when printing errors */

174

void perror_plus(const char *print_text){

175

int e = errno;

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

177

program_invocation_short_name);

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errno = e;

179

perror(print_text);

180

}

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182

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

183

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

184

va_list ap;

185

va_start (ap, format);

186

187

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

188

program_invocation_short_name));

189

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

190

}

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191

145

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/*

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193

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

148

195

* "buffer_length" is how much is already used.

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196

*/

150

197

size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

198

size_t buffer_capacity){

152

199

if(buffer_length + BUFFER_SIZE > buffer_capacity){

153

200

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

154

201

if(buffer == NULL){

159

206

return buffer_capacity;

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207

}

161

208

209

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

210

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

211

int af){

212

int ret;

213

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

214

if(new_server == NULL){

215

perror_plus("malloc");

216

return false;

217

}

218

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

219

.port = port,

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.if_index = if_index,

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.af = af };

222

if(new_server->ip == NULL){

223

perror_plus("strdup");

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return false;

225

}

226

/* Special case of first server */

227

if (mc.current_server == NULL){

228

new_server->next = new_server;

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new_server->prev = new_server;

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mc.current_server = new_server;

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

232

} else {

233

new_server->next = mc.current_server;

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

235

new_server->prev->next = new_server;

236

mc.current_server->prev = new_server;

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}

238

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

239

if(ret == -1){

240

perror_plus("clock_gettime");

241

return false;

242

}

243

return true;

244

}

245

162

246

/*

163

247

* Initialize GPGME.

164

248

*/

165

static bool init_gpgme(const char *seckey,

166

const char *pubkey, const char *tempdir){

167

int ret;

249

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

250

const char *tempdir){

168

251

gpgme_error_t rc;

169

252

gpgme_engine_info_t engine_info;

170

253

173

256

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

174

257

*/

175

258

bool import_key(const char *filename){

259

int ret;

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260

int fd;

177

261

gpgme_data_t pgp_data;

178

262

179

263

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

180

264

if(fd == -1){

181

perror("open");

265

perror_plus("open");

182

266

return false;

183

267

}

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268

185

269

rc = gpgme_data_new_from_fd(&pgp_data, fd);

186

270

if(rc != GPG_ERR_NO_ERROR){

187

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

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gpgme_strsource(rc), gpgme_strerror(rc));

271

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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273

return false;

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274

}

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275

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rc = gpgme_op_import(mc.ctx, pgp_data);

193

277

if(rc != GPG_ERR_NO_ERROR){

194

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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281

}

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

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284

if(ret == -1){

201

perror("close");

285

perror_plus("close");

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286

}

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gpgme_data_release(pgp_data);

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return true;

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289

}

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if(debug){

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

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

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}

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/* Init GPGME */

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gpgme_check_version(NULL);

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rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

299

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

300

gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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302

}

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303

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

304

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

221

305

rc = gpgme_get_engine_info(&engine_info);

222

306

if(rc != GPG_ERR_NO_ERROR){

223

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

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gpgme_strsource(rc), gpgme_strerror(rc));

307

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

308

gpgme_strsource(rc), gpgme_strerror(rc));

225

309

return false;

226

310

}

227

311

while(engine_info != NULL){

233

317

engine_info = engine_info->next;

234

318

}

235

319

if(engine_info == NULL){

236

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

320

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

321

tempdir);

237

322

return false;

238

323

}

239

324

240

325

/* Create new GPGME "context" */

241

326

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

242

327

if(rc != GPG_ERR_NO_ERROR){

243

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

244

gpgme_strsource(rc), gpgme_strerror(rc));

328

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

329

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

330

gpgme_strerror(rc));

245

331

return false;

246

332

}

247

333

249

335

return false;

250

336

}

251

337

252

return true;

338

return true;

253

339

}

254

340

255

341

/*

266

352

ssize_t plaintext_length = 0;

267

353

268

354

if(debug){

269

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

355

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

270

356

}

271

357

272

358

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

273

359

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

274

360

0);

275

361

if(rc != GPG_ERR_NO_ERROR){

276

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

277

gpgme_strsource(rc), gpgme_strerror(rc));

362

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

363

gpgme_strsource(rc), gpgme_strerror(rc));

278

364

return -1;

279

365

}

280

366

281

367

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

282

368

rc = gpgme_data_new(&dh_plain);

283

369

if(rc != GPG_ERR_NO_ERROR){

284

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

285

gpgme_strsource(rc), gpgme_strerror(rc));

370

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

371

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

372

gpgme_strsource(rc), gpgme_strerror(rc));

286

373

gpgme_data_release(dh_crypto);

287

374

return -1;

288

375

}

291

378

data buffer */

292

379

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

293

380

if(rc != GPG_ERR_NO_ERROR){

294

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

295

gpgme_strsource(rc), gpgme_strerror(rc));

381

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

382

gpgme_strsource(rc), gpgme_strerror(rc));

296

383

plaintext_length = -1;

297

384

if(debug){

298

385

gpgme_decrypt_result_t result;

299

386

result = gpgme_op_decrypt_result(mc.ctx);

300

387

if(result == NULL){

301

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

388

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

302

389

} else {

303

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

304

result->unsupported_algorithm);

305

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

306

result->wrong_key_usage);

390

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

391

result->unsupported_algorithm);

392

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

393

result->wrong_key_usage);

307

394

if(result->file_name != NULL){

308

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

395

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

309

396

}

310

397

gpgme_recipient_t recipient;

311

398

recipient = result->recipients;

312

if(recipient){

313

while(recipient != NULL){

314

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

315

gpgme_pubkey_algo_name(recipient->pubkey_algo));

316

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

317

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

318

recipient->status == GPG_ERR_NO_SECKEY

319

? "No" : "Yes");

320

recipient = recipient->next;

321

}

399

while(recipient != NULL){

400

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

401

gpgme_pubkey_algo_name

402

(recipient->pubkey_algo));

403

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

404

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

405

recipient->status == GPG_ERR_NO_SECKEY

406

? "No" : "Yes");

407

recipient = recipient->next;

322

408

}

323

409

}

324

410

}

326

412

}

327

413

328

414

if(debug){

329

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

415

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

330

416

}

331

417

332

418

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

333

419

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

334

perror("gpgme_data_seek");

420

perror_plus("gpgme_data_seek");

335

421

plaintext_length = -1;

336

422

goto decrypt_end;

337

423

}

339

425

*plaintext = NULL;

340

426

while(true){

341

427

plaintext_capacity = incbuffer(plaintext,

342

(size_t)plaintext_length,

343

plaintext_capacity);

428

(size_t)plaintext_length,

429

plaintext_capacity);

344

430

if(plaintext_capacity == 0){

345

perror("incbuffer");

346

plaintext_length = -1;

347

goto decrypt_end;

431

perror_plus("incbuffer");

432

plaintext_length = -1;

433

goto decrypt_end;

348

434

}

349

435

350

436

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

355

441

break;

356

442

}

357

443

if(ret < 0){

358

perror("gpgme_data_read");

444

perror_plus("gpgme_data_read");

359

445

plaintext_length = -1;

360

446

goto decrypt_end;

361

447

}

363

449

}

364

450

365

451

if(debug){

366

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

452

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

367

453

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

368

454

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

369

455

}

391

477

/* GnuTLS log function callback */

392

478

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

393

479

const char* string){

394

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

480

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

395

481

}

396

482

397

483

static int init_gnutls_global(const char *pubkeyfilename,

399

485

int ret;

400

486

401

487

if(debug){

402

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

488

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

403

489

}

404

490

405

491

ret = gnutls_global_init();

406

492

if(ret != GNUTLS_E_SUCCESS){

407

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

408

safer_gnutls_strerror(ret));

493

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

494

safer_gnutls_strerror(ret));

409

495

return -1;

410

496

}

411

497

418

504

}

419

505

420

506

/* OpenPGP credentials */

421

gnutls_certificate_allocate_credentials(&mc.cred);

507

ret = gnutls_certificate_allocate_credentials(&mc.cred);

422

508

if(ret != GNUTLS_E_SUCCESS){

423

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

424

from

425

-Wunreachable-code

426

*/

427

safer_gnutls_strerror(ret));

509

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

510

safer_gnutls_strerror(ret));

428

511

gnutls_global_deinit();

429

512

return -1;

430

513

}

431

514

432

515

if(debug){

433

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

434

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

435

seckeyfilename);

516

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

517

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

518

pubkeyfilename,

519

seckeyfilename);

436

520

}

437

521

438

522

ret = gnutls_certificate_set_openpgp_key_file

439

523

(mc.cred, pubkeyfilename, seckeyfilename,

440

524

GNUTLS_OPENPGP_FMT_BASE64);

441

525

if(ret != GNUTLS_E_SUCCESS){

442

fprintf(stderr,

443

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

444

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

445

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

446

safer_gnutls_strerror(ret));

526

fprintf_plus(stderr,

527

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

528

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

529

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

530

safer_gnutls_strerror(ret));

447

531

goto globalfail;

448

532

}

449

533

450

534

/* GnuTLS server initialization */

451

535

ret = gnutls_dh_params_init(&mc.dh_params);

452

536

if(ret != GNUTLS_E_SUCCESS){

453

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

454

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

537

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

538

" initialization: %s\n",

539

safer_gnutls_strerror(ret));

455

540

goto globalfail;

456

541

}

457

542

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

458

543

if(ret != GNUTLS_E_SUCCESS){

459

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

460

safer_gnutls_strerror(ret));

544

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

545

safer_gnutls_strerror(ret));

461

546

goto globalfail;

462

547

}

463

548

476

561

static int init_gnutls_session(gnutls_session_t *session){

477

562

int ret;

478

563

/* GnuTLS session creation */

479

ret = gnutls_init(session, GNUTLS_SERVER);

564

do {

565

ret = gnutls_init(session, GNUTLS_SERVER);

566

if(quit_now){

567

return -1;

568

}

569

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

480

570

if(ret != GNUTLS_E_SUCCESS){

481

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

482

safer_gnutls_strerror(ret));

571

fprintf_plus(stderr,

572

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

573

safer_gnutls_strerror(ret));

483

574

}

484

575

485

576

{

486

577

const char *err;

487

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

578

do {

579

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

580

if(quit_now){

581

gnutls_deinit(*session);

582

return -1;

583

}

584

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

488

585

if(ret != GNUTLS_E_SUCCESS){

489

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

490

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

491

safer_gnutls_strerror(ret));

586

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

587

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

588

safer_gnutls_strerror(ret));

492

589

gnutls_deinit(*session);

493

590

return -1;

494

591

}

495

592

}

496

593

497

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

498

mc.cred);

594

do {

595

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

596

mc.cred);

597

if(quit_now){

598

gnutls_deinit(*session);

599

return -1;

600

}

601

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

499

602

if(ret != GNUTLS_E_SUCCESS){

500

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

501

safer_gnutls_strerror(ret));

603

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

604

safer_gnutls_strerror(ret));

502

605

gnutls_deinit(*session);

503

606

return -1;

504

607

}

505

608

506

609

/* ignore client certificate if any. */

507

gnutls_certificate_server_set_request(*session,

508

GNUTLS_CERT_IGNORE);

610

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

509

611

510

612

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

511

613

520

622

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

521

623

AvahiIfIndex if_index,

522

624

int af){

523

int ret, tcp_sd;

625

int ret, tcp_sd = -1;

524

626

ssize_t sret;

525

627

union {

526

628

struct sockaddr_in in;

527

629

struct sockaddr_in6 in6;

528

630

} to;

529

631

char *buffer = NULL;

530

char *decrypted_buffer;

632

char *decrypted_buffer = NULL;

531

633

size_t buffer_length = 0;

532

634

size_t buffer_capacity = 0;

533

ssize_t decrypted_buffer_size;

534

635

size_t written;

535

int retval = 0;

636

int retval = -1;

536

637

gnutls_session_t session;

537

638

int pf; /* Protocol family */

538

639

640

errno = 0;

641

642

if(quit_now){

643

errno = EINTR;

644

return -1;

645

}

646

539

647

switch(af){

540

648

case AF_INET6:

541

649

pf = PF_INET6;

544

652

pf = PF_INET;

545

653

break;

546

654

default:

547

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

655

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

656

errno = EINVAL;

548

657

return -1;

549

658

}

550

659

554

663

}

555

664

556

665

if(debug){

557

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

558

"\n", ip, port);

666

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

667

PRIu16 "\n", ip, port);

559

668

}

560

669

561

670

tcp_sd = socket(pf, SOCK_STREAM, 0);

562

671

if(tcp_sd < 0){

563

perror("socket");

564

return -1;

672

int e = errno;

673

perror_plus("socket");

674

errno = e;

675

goto mandos_end;

676

}

677

678

if(quit_now){

679

errno = EINTR;

680

goto mandos_end;

565

681

}

566

682

567

683

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

573

689

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

574

690

}

575

691

if(ret < 0 ){

576

perror("inet_pton");

577

return -1;

692

int e = errno;

693

perror_plus("inet_pton");

694

errno = e;

695

goto mandos_end;

578

696

}

579

697

if(ret == 0){

580

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

581

return -1;

698

int e = errno;

699

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

700

errno = e;

701

goto mandos_end;

582

702

}

583

703

if(af == AF_INET6){

584

704

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

587

707

588

708

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

589

709

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

590

-Wunreachable-code*/

710

-Wunreachable-code*/

591

711

if(if_index == AVAHI_IF_UNSPEC){

592

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

593

" without a network interface\n");

594

return -1;

712

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

713

" incomplete without a network interface\n");

714

errno = EINVAL;

715

goto mandos_end;

595

716

}

596

717

/* Set the network interface number as scope */

597

718

to.in6.sin6_scope_id = (uint32_t)if_index;

602

723

-Wunreachable-code */

603

724

}

604

725

726

if(quit_now){

727

errno = EINTR;

728

goto mandos_end;

729

}

730

605

731

if(debug){

606

732

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

607

733

char interface[IF_NAMESIZE];

608

734

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

609

perror("if_indextoname");

735

perror_plus("if_indextoname");

610

736

} else {

611

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

612

ip, interface, port);

737

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

738

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

613

739

}

614

740

} else {

615

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

616

port);

741

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

742

ip, port);

617

743

}

618

744

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

619

745

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

626

752

sizeof(addrstr));

627

753

}

628

754

if(pcret == NULL){

629

perror("inet_ntop");

755

perror_plus("inet_ntop");

630

756

} else {

631

757

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

632

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

758

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

633

759

}

634

760

}

635

761

}

636

762

763

if(quit_now){

764

errno = EINTR;

765

goto mandos_end;

766

}

767

637

768

if(af == AF_INET6){

638

769

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

639

770

} else {

640

771

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

641

772

}

642

773

if(ret < 0){

643

perror("connect");

644

return -1;

774

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

775

int e = errno;

776

perror_plus("connect");

777

errno = e;

778

}

779

goto mandos_end;

780

}

781

782

if(quit_now){

783

errno = EINTR;

784

goto mandos_end;

645

785

}

646

786

647

787

const char *out = mandos_protocol_version;

649

789

while(true){

650

790

size_t out_size = strlen(out);

651

791

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

652

out_size - written));

792

out_size - written));

653

793

if(ret == -1){

654

perror("write");

655

retval = -1;

794

int e = errno;

795

perror_plus("write");

796

errno = e;

656

797

goto mandos_end;

657

798

}

658

799

written += (size_t)ret;

666

807

break;

667

808

}

668

809

}

810

811

if(quit_now){

812

errno = EINTR;

813

goto mandos_end;

814

}

669

815

}

670

816

671

817

if(debug){

672

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

673

}

674

675

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

676

677

do{

818

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

819

}

820

821

if(quit_now){

822

errno = EINTR;

823

goto mandos_end;

824

}

825

826

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

827

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

828

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

829

gnutls_transport_set_ptr(session,

830

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

831

832

if(quit_now){

833

errno = EINTR;

834

goto mandos_end;

835

}

836

837

do {

678

838

ret = gnutls_handshake(session);

839

if(quit_now){

840

errno = EINTR;

841

goto mandos_end;

842

}

679

843

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

680

844

681

845

if(ret != GNUTLS_E_SUCCESS){

682

846

if(debug){

683

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

847

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

684

848

gnutls_perror(ret);

685

849

}

686

retval = -1;

850

errno = EPROTO;

687

851

goto mandos_end;

688

852

}

689

853

690

854

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

691

855

692

856

if(debug){

693

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

694

ip);

857

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

858

" %s\n", ip);

695

859

}

696

860

697

861

while(true){

862

863

if(quit_now){

864

errno = EINTR;

865

goto mandos_end;

866

}

867

698

868

buffer_capacity = incbuffer(&buffer, buffer_length,

699

buffer_capacity);

869

buffer_capacity);

700

870

if(buffer_capacity == 0){

701

perror("incbuffer");

702

retval = -1;

871

int e = errno;

872

perror_plus("incbuffer");

873

errno = e;

874

goto mandos_end;

875

}

876

877

if(quit_now){

878

errno = EINTR;

703

879

goto mandos_end;

704

880

}

705

881

714

890

case GNUTLS_E_AGAIN:

715

891

break;

716

892

case GNUTLS_E_REHANDSHAKE:

717

do{

893

do {

718

894

ret = gnutls_handshake(session);

895

896

if(quit_now){

897

errno = EINTR;

898

goto mandos_end;

899

}

719

900

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

720

901

if(ret < 0){

721

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

902

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

903

"***\n");

722

904

gnutls_perror(ret);

723

retval = -1;

905

errno = EPROTO;

724

906

goto mandos_end;

725

907

}

726

908

break;

727

909

default:

728

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

729

" encrypted session with Mandos server\n");

730

retval = -1;

910

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

911

" encrypted session with Mandos server\n");

731

912

gnutls_bye(session, GNUTLS_SHUT_RDWR);

913

errno = EIO;

732

914

goto mandos_end;

733

915

}

734

916

} else {

737

919

}

738

920

739

921

if(debug){

740

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

741

}

742

743

gnutls_bye(session, GNUTLS_SHUT_RDWR);

922

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

923

}

924

925

if(quit_now){

926

errno = EINTR;

927

goto mandos_end;

928

}

929

930

do {

931

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

932

if(quit_now){

933

errno = EINTR;

934

goto mandos_end;

935

}

936

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

744

937

745

938

if(buffer_length > 0){

746

decrypted_buffer_size = pgp_packet_decrypt(buffer,

747

buffer_length,

939

ssize_t decrypted_buffer_size;

940

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

748

941

&decrypted_buffer);

749

942

if(decrypted_buffer_size >= 0){

943

750

944

written = 0;

751

945

while(written < (size_t) decrypted_buffer_size){

946

if(quit_now){

947

errno = EINTR;

948

goto mandos_end;

949

}

950

752

951

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

753

952

(size_t)decrypted_buffer_size - written,

754

953

stdout);

755

954

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

955

int e = errno;

756

956

if(debug){

757

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

758

strerror(errno));

957

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

958

strerror(errno));

759

959

}

760

retval = -1;

761

break;

960

errno = e;

961

goto mandos_end;

762

962

}

763

963

written += (size_t)ret;

764

964

}

765

free(decrypted_buffer);

766

} else {

767

retval = -1;

965

retval = 0;

768

966

}

769

} else {

770

retval = -1;

771

967

}

772

968

773

969

/* Shutdown procedure */

774

970

775

971

mandos_end:

776

free(buffer);

777

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

778

if(ret == -1){

779

perror("close");

972

{

973

int e = errno;

974

free(decrypted_buffer);

975

free(buffer);

976

if(tcp_sd >= 0){

977

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

978

}

979

if(ret == -1){

980

if(e == 0){

981

e = errno;

982

}

983

perror_plus("close");

984

}

985

gnutls_deinit(session);

986

errno = e;

987

if(quit_now){

988

errno = EINTR;

989

retval = -1;

990

}

780

991

}

781

gnutls_deinit(session);

782

992

return retval;

783

993

}

784

994

801

1011

/* Called whenever a service has been resolved successfully or

802

1012

timed out */

803

1013

1014

if(quit_now){

1015

return;

1016

}

1017

804

1018

switch(event){

805

1019

default:

806

1020

case AVAHI_RESOLVER_FAILURE:

807

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

808

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

809

avahi_strerror(avahi_server_errno(mc.server)));

1021

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

1022

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

1023

domain,

1024

avahi_strerror(avahi_server_errno(mc.server)));

810

1025

break;

811

1026

812

1027

case AVAHI_RESOLVER_FOUND:

814

1029

char ip[AVAHI_ADDRESS_STR_MAX];

815

1030

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

816

1031

if(debug){

817

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

818

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

819

ip, (intmax_t)interface, port);

1032

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

1033

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

1034

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

820

1035

}

821

1036

int ret = start_mandos_communication(ip, port, interface,

822

1037

avahi_proto_to_af(proto));

823

1038

if(ret == 0){

824

1039

avahi_simple_poll_quit(mc.simple_poll);

1040

} else {

1041

if(not add_server(ip, port, interface,

1042

avahi_proto_to_af(proto))){

1043

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

1044

" list\n", name);

1045

}

825

1046

}

826

1047

}

827

1048

}

843

1064

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

844

1065

is removed from the LAN */

845

1066

1067

if(quit_now){

1068

return;

1069

}

1070

846

1071

switch(event){

847

1072

default:

848

1073

case AVAHI_BROWSER_FAILURE:

849

1074

850

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

851

avahi_strerror(avahi_server_errno(mc.server)));

1075

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

1076

avahi_strerror(avahi_server_errno(mc.server)));

852

1077

avahi_simple_poll_quit(mc.simple_poll);

853

1078

return;

854

1079

861

1086

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

862

1087

name, type, domain, protocol, 0,

863

1088

resolve_callback, NULL) == NULL)

864

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

865

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

1089

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

1090

" %s\n", name,

1091

avahi_strerror(avahi_server_errno(mc.server)));

866

1092

break;

867

1093

868

1094

case AVAHI_BROWSER_REMOVE:

871

1097

case AVAHI_BROWSER_ALL_FOR_NOW:

872

1098

case AVAHI_BROWSER_CACHE_EXHAUSTED:

873

1099

if(debug){

874

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

1100

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

1101

" searching...\n");

875

1102

}

876

1103

break;

877

1104

}

878

1105

}

879

1106

880

sig_atomic_t quit_now = 0;

881

882

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

883

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

1107

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

1108

static void handle_sigterm(int sig){

884

1109

if(quit_now){

885

1110

return;

886

1111

}

887

1112

quit_now = 1;

1113

signal_received = sig;

888

1114

int old_errno = errno;

1115

/* set main loop to exit */

889

1116

if(mc.simple_poll != NULL){

890

1117

avahi_simple_poll_quit(mc.simple_poll);

891

1118

}

892

1119

errno = old_errno;

893

1120

}

894

1121

1122

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

1123

int ret;

1124

1125

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

1126

if(s < 0){

1127

perror_plus("socket");

1128

return false;

1129

}

1130

strcpy(ifr->ifr_name, ifname);

1131

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1132

if(ret == -1){

1133

if(debug){

1134

perror_plus("ioctl SIOCGIFFLAGS");

1135

}

1136

return false;

1137

}

1138

return true;

1139

}

1140

1141

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

1142

1143

/* Reject the loopback device */

1144

if(ifr->ifr_flags & IFF_LOOPBACK){

1145

if(debug){

1146

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

1147

ifname);

1148

}

1149

return false;

1150

}

1151

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

1152

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

1153

if(debug){

1154

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

1155

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

1156

}

1157

return true;

1158

}

1159

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

1160

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

1161

if(debug){

1162

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1163

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

1164

}

1165

return false;

1166

}

1167

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

1168

if(ifr->ifr_flags & IFF_NOARP){

1169

if(debug){

1170

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

1171

ifname);

1172

}

1173

return false;

1174

}

1175

1176

/* Accept this device */

1177

if(debug){

1178

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

1179

}

1180

return true;

1181

}

1182

1183

/*

1184

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

1185

* corresponds to an acceptable network device.

1186

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

1187

*/

1188

int good_interface(const struct dirent *if_entry){

1189

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

1190

return 0;

1191

}

1192

1193

struct ifreq ifr;

1194

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

1195

if(debug){

1196

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

1197

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

1198

}

1199

return 0;

1200

}

1201

1202

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

1203

return 0;

1204

}

1205

return 1;

1206

}

1207

1208

/*

1209

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

1210

* corresponds to an acceptable network device which is up.

1211

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

1212

*/

1213

int up_interface(const struct dirent *if_entry){

1214

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

1215

return 0;

1216

}

1217

1218

struct ifreq ifr;

1219

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

1220

if(debug){

1221

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

1222

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

1223

}

1224

return 0;

1225

}

1226

1227

/* Reject down interfaces */

1228

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

1229

if(debug){

1230

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

1231

if_entry->d_name);

1232

}

1233

return 0;

1234

}

1235

1236

/* Reject non-running interfaces */

1237

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

1238

if(debug){

1239

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

1240

if_entry->d_name);

1241

}

1242

return 0;

1243

}

1244

1245

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

1246

return 0;

1247

}

1248

return 1;

1249

}

1250

1251

int notdotentries(const struct dirent *direntry){

1252

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

1253

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

1254

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

1255

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

1256

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

1257

return 0;

1258

}

1259

return 1;

1260

}

1261

1262

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

1263

int runnable_hook(const struct dirent *direntry){

1264

int ret;

1265

size_t sret;

1266

struct stat st;

1267

1268

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

1269

/* Empty name? */

1270

return 0;

1271

}

1272

1273

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

1274

"abcdefghijklmnopqrstuvwxyz"

1275

"0123456789"

1276

"_-");

1277

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

1278

/* Contains non-allowed characters */

1279

if(debug){

1280

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

1281

direntry->d_name);

1282

}

1283

return 0;

1284

}

1285

1286

char *fullname = NULL;

1287

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

1288

if(ret < 0){

1289

perror_plus("asprintf");

1290

return 0;

1291

}

1292

1293

ret = stat(fullname, &st);

1294

if(ret == -1){

1295

if(debug){

1296

perror_plus("Could not stat hook");

1297

}

1298

return 0;

1299

}

1300

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

1301

/* Not a regular file */

1302

if(debug){

1303

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

1304

direntry->d_name);

1305

}

1306

return 0;

1307

}

1308

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

1309

/* Not executable */

1310

if(debug){

1311

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

1312

direntry->d_name);

1313

}

1314

return 0;

1315

}

1316

if(debug){

1317

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

1318

direntry->d_name);

1319

}

1320

return 1;

1321

}

1322

1323

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1324

int ret;

1325

struct timespec now;

1326

struct timespec waited_time;

1327

intmax_t block_time;

1328

1329

while(true){

1330

if(mc.current_server == NULL){

1331

if (debug){

1332

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

1333

" No timeout!\n");

1334

}

1335

ret = avahi_simple_poll_iterate(s, -1);

1336

} else {

1337

if (debug){

1338

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

1339

" it, or wait\n");

1340

}

1341

/* the current time */

1342

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1343

if(ret == -1){

1344

perror_plus("clock_gettime");

1345

return -1;

1346

}

1347

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

1348

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

1349

waited_time.tv_sec = (now.tv_sec

1350

- mc.current_server->last_seen.tv_sec);

1351

waited_time.tv_nsec = (now.tv_nsec

1352

- mc.current_server->last_seen.tv_nsec);

1353

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

1354

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

1355

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

1356

block_time = ((retry_interval

1357

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

1358

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

1359

1360

if (debug){

1361

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

1362

block_time);

1363

}

1364

1365

if(block_time <= 0){

1366

ret = start_mandos_communication(mc.current_server->ip,

1367

mc.current_server->port,

1368

mc.current_server->if_index,

1369

mc.current_server->af);

1370

if(ret == 0){

1371

avahi_simple_poll_quit(mc.simple_poll);

1372

return 0;

1373

}

1374

ret = clock_gettime(CLOCK_MONOTONIC,

1375

&mc.current_server->last_seen);

1376

if(ret == -1){

1377

perror_plus("clock_gettime");

1378

return -1;

1379

}

1380

mc.current_server = mc.current_server->next;

1381

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

1382

servers, but don't block */

1383

}

1384

1385

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

1386

}

1387

if(ret != 0){

1388

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

1389

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

1390

}

1391

}

1392

}

1393

}

1394

1395

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

1396

int raise_privileges(void){

1397

int old_errno = errno;

1398

int ret_errno = 0;

1399

errno = 0;

1400

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

1401

perror_plus("seteuid");

1402

}

1403

ret_errno = errno;

1404

errno = old_errno;

1405

return ret_errno;

1406

}

1407

1408

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

1409

int raise_privileges_permanently(void){

1410

int old_errno = errno;

1411

int ret_errno = raise_privileges();

1412

if(ret_errno != 0){

1413

errno = old_errno;

1414

return ret_errno;

1415

}

1416

errno = 0;

1417

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

1418

perror_plus("seteuid");

1419

}

1420

ret_errno = errno;

1421

errno = old_errno;

1422

return ret_errno;

1423

}

1424

1425

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

1426

int lower_privileges(void){

1427

int old_errno = errno;

1428

int ret_errno = 0;

1429

errno = 0;

1430

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

1431

perror_plus("seteuid");

1432

}

1433

ret_errno = errno;

1434

errno = old_errno;

1435

return ret_errno;

1436

}

1437

1438

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

1439

const float delay){

1440

struct dirent **direntries;

1441

struct dirent *direntry;

1442

int ret;

1443

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

1444

alphasort);

1445

if(numhooks == -1){

1446

perror_plus("scandir");

1447

} else {

1448

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

1449

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

1450

direntry = direntries[i];

1451

char *fullname = NULL;

1452

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

1453

if(ret < 0){

1454

perror_plus("asprintf");

1455

continue;

1456

}

1457

if(debug){

1458

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

1459

direntry->d_name);

1460

}

1461

pid_t hook_pid = fork();

1462

if(hook_pid == 0){

1463

/* Child */

1464

/* Raise privileges */

1465

raise_privileges_permanently();

1466

/* Set group */

1467

errno = 0;

1468

ret = setgid(0);

1469

if(ret == -1){

1470

perror_plus("setgid");

1471

}

1472

/* Reset supplementary groups */

1473

errno = 0;

1474

ret = setgroups(0, NULL);

1475

if(ret == -1){

1476

perror_plus("setgroups");

1477

}

1478

dup2(devnull, STDIN_FILENO);

1479

close(devnull);

1480

dup2(STDERR_FILENO, STDOUT_FILENO);

1481

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

1482

if(ret == -1){

1483

perror_plus("setenv");

1484

_exit(EX_OSERR);

1485

}

1486

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

1487

if(ret == -1){

1488

perror_plus("setenv");

1489

_exit(EX_OSERR);

1490

}

1491

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

1492

if(ret == -1){

1493

perror_plus("setenv");

1494

_exit(EX_OSERR);

1495

}

1496

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

1497

if(ret == -1){

1498

perror_plus("setenv");

1499

_exit(EX_OSERR);

1500

}

1501

char *delaystring;

1502

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

1503

if(ret == -1){

1504

perror_plus("asprintf");

1505

_exit(EX_OSERR);

1506

}

1507

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

1508

if(ret == -1){

1509

free(delaystring);

1510

perror_plus("setenv");

1511

_exit(EX_OSERR);

1512

}

1513

free(delaystring);

1514

if(connect_to != NULL){

1515

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

1516

if(ret == -1){

1517

perror_plus("setenv");

1518

_exit(EX_OSERR);

1519

}

1520

}

1521

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

1522

perror_plus("execl");

1523

_exit(EXIT_FAILURE);

1524

}

1525

} else {

1526

int status;

1527

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

1528

perror_plus("waitpid");

1529

free(fullname);

1530

continue;

1531

}

1532

if(WIFEXITED(status)){

1533

if(WEXITSTATUS(status) != 0){

1534

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

1535

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

1536

WEXITSTATUS(status));

1537

free(fullname);

1538

continue;

1539

}

1540

} else if(WIFSIGNALED(status)){

1541

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

1542

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

1543

WTERMSIG(status));

1544

free(fullname);

1545

continue;

1546

} else {

1547

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

1548

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

1549

free(fullname);

1550

continue;

1551

}

1552

}

1553

free(fullname);

1554

if(debug){

1555

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

1556

direntry->d_name);

1557

}

1558

}

1559

close(devnull);

1560

}

1561

return true;

1562

}

1563

1564

int bring_up_interface(const char * const interface, const float delay){

1565

int sd = -1;

1566

int old_errno = errno;

1567

int ret_errno = 0;

1568

int ret;

1569

struct ifreq network;

1570

AvahiIfIndex if_index = (AvahiIfIndex)if_nametoindex(interface);

1571

if(if_index == 0){

1572

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

1573

errno = old_errno;

1574

return ENXIO;

1575

}

1576

1577

if(quit_now){

1578

errno = old_errno;

1579

return EINTR;

1580

}

1581

1582

/* Re-raise priviliges */

1583

raise_privileges();

1584

1585

#ifdef __linux__

1586

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1587

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

1588

ret = klogctl(8, NULL, 5);

1589

bool restore_loglevel = true;

1590

if(ret == -1){

1591

restore_loglevel = false;

1592

perror_plus("klogctl");

1593

}

1594

#endif /* __linux__ */

1595

1596

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1597

if(sd < 0){

1598

ret_errno = errno;

1599

perror_plus("socket");

1600

#ifdef __linux__

1601

if(restore_loglevel){

1602

ret = klogctl(7, NULL, 0);

1603

if(ret == -1){

1604

perror_plus("klogctl");

1605

}

1606

}

1607

#endif /* __linux__ */

1608

/* Lower privileges */

1609

lower_privileges();

1610

errno = old_errno;

1611

return ret_errno;

1612

}

1613

strcpy(network.ifr_name, interface);

1614

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

1615

if(ret == -1){

1616

ret_errno = errno;

1617

perror_plus("ioctl SIOCGIFFLAGS");

1618

#ifdef __linux__

1619

if(restore_loglevel){

1620

ret = klogctl(7, NULL, 0);

1621

if(ret == -1){

1622

perror_plus("klogctl");

1623

}

1624

}

1625

#endif /* __linux__ */

1626

/* Lower privileges */

1627

lower_privileges();

1628

errno = old_errno;

1629

return ret_errno;

1630

}

1631

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

1632

network.ifr_flags |= IFF_UP;

1633

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

1634

if(ret == -1){

1635

ret_errno = errno;

1636

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1637

#ifdef __linux__

1638

if(restore_loglevel){

1639

ret = klogctl(7, NULL, 0);

1640

if(ret == -1){

1641

perror_plus("klogctl");

1642

}

1643

}

1644

#endif /* __linux__ */

1645

/* Lower privileges */

1646

lower_privileges();

1647

errno = old_errno;

1648

return ret_errno;

1649

}

1650

}

1651

/* Sleep checking until interface is running.

1652

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

1653

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

1654

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

1655

if(ret == -1){

1656

perror_plus("ioctl SIOCGIFFLAGS");

1657

} else if(network.ifr_flags & IFF_RUNNING){

1658

break;

1659

}

1660

struct timespec sleeptime = { .tv_nsec = 250000000 };

1661

ret = nanosleep(&sleeptime, NULL);

1662

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

1663

perror_plus("nanosleep");

1664

}

1665

}

1666

/* Close the socket */

1667

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

1668

if(ret == -1){

1669

perror_plus("close");

1670

}

1671

#ifdef __linux__

1672

if(restore_loglevel){

1673

/* Restores kernel loglevel to default */

1674

ret = klogctl(7, NULL, 0);

1675

if(ret == -1){

1676

perror_plus("klogctl");

1677

}

1678

}

1679

#endif /* __linux__ */

1680

/* Lower privileges */

1681

lower_privileges();

1682

errno = old_errno;

1683

return 0;

1684

}

1685

895

1686

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

896

1687

AvahiSServiceBrowser *sb = NULL;

897

1688

int error;

899

1690

intmax_t tmpmax;

900

1691

char *tmp;

901

1692

int exitcode = EXIT_SUCCESS;

902

const char *interface = "eth0";

1693

const char *interface = "";

903

1694

struct ifreq network;

904

int sd;

905

uid_t uid;

906

gid_t gid;

907

char *connect_to = NULL;

1695

int sd = -1;

1696

bool take_down_interface = false;

908

1697

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

909

1698

bool tempdir_created = false;

910

1699

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

914

1703

bool gnutls_initialized = false;

915

1704

bool gpgme_initialized = false;

916

1705

float delay = 2.5f;

1706

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

1707

retrying the same server again */

917

1708

918

struct sigaction old_sigterm_action;

1709

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

919

1710

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

920

1711

1712

uid = getuid();

1713

gid = getgid();

1714

1715

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

1716

errno = 0;

1717

ret = setgid(gid);

1718

if(ret == -1){

1719

perror_plus("setgid");

1720

}

1721

1722

/* Lower user privileges (temporarily) */

1723

errno = 0;

1724

ret = seteuid(uid);

1725

if(ret == -1){

1726

perror_plus("seteuid");

1727

}

1728

1729

if(quit_now){

1730

goto end;

1731

}

1732

921

1733

{

922

1734

struct argp_option options[] = {

923

1735

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

952

1764

.arg = "SECONDS",

953

1765

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

954

1766

.group = 2 },

1767

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

1768

.arg = "SECONDS",

1769

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

1770

.group = 2 },

1771

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

1772

.arg = "DIR",

1773

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

1774

.group = 2 },

1775

/*

1776

* These reproduce what we would get without ARGP_NO_HELP

1777

*/

1778

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

1779

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

1780

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

1781

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

1782

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

1783

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

955

1784

{ .name = NULL }

956

1785

};

957

1786

958

1787

error_t parse_opt(int key, char *arg,

959

1788

struct argp_state *state){

1789

errno = 0;

960

1790

switch(key){

961

1791

case 128: /* --debug */

962

1792

debug = true;

978

1808

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

979

1809

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

980

1810

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

981

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

982

exit(EXIT_FAILURE);

1811

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

983

1812

}

984

1813

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

985

1814

break;

990

1819

errno = 0;

991

1820

delay = strtof(arg, &tmp);

992

1821

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

993

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

994

exit(EXIT_FAILURE);

995

}

996

break;

997

case ARGP_KEY_ARG:

998

argp_usage(state);

999

case ARGP_KEY_END:

1822

argp_error(state, "Bad delay");

1823

}

1824

case 132: /* --retry */

1825

errno = 0;

1826

retry_interval = strtod(arg, &tmp);

1827

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

1828

or (retry_interval * 1000) > INT_MAX

1829

or retry_interval < 0){

1830

argp_error(state, "Bad retry interval");

1831

}

1832

break;

1833

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

1834

hookdir = arg;

1835

break;

1836

/*

1837

* These reproduce what we would get without ARGP_NO_HELP

1838

*/

1839

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

1840

argp_state_help(state, state->out_stream,

1841

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1842

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1843

case -3: /* --usage */

1844

argp_state_help(state, state->out_stream,

1845

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1846

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

1847

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

1848

exit(argp_err_exit_status);

1000

1849

break;

1001

1850

default:

1002

1851

return ARGP_ERR_UNKNOWN;

1003

1852

}

1004

return 0;

1853

return errno;

1005

1854

}

1006

1855

1007

1856

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

1008

1857

.args_doc = "",

1009

1858

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

1010

1859

" passwords from a Mandos server" };

1011

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

1012

if(ret == ARGP_ERR_UNKNOWN){

1013

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

1014

exitcode = EXIT_FAILURE;

1015

goto end;

1016

}

1860

ret = argp_parse(&argp, argc, argv,

1861

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1862

switch(ret){

1863

case 0:

1864

break;

1865

case ENOMEM:

1866

default:

1867

errno = ret;

1868

perror_plus("argp_parse");

1869

exitcode = EX_OSERR;

1870

goto end;

1871

case EINVAL:

1872

exitcode = EX_USAGE;

1873

goto end;

1874

}

1875

}

1876

1877

{

1878

/* Work around Debian bug #633582:

1879

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

1880

1881

/* Re-raise priviliges */

1882

if(raise_privileges() == 0){

1883

struct stat st;

1884

1885

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

1886

int seckey_fd = open(seckey, O_RDONLY);

1887

if(seckey_fd == -1){

1888

perror_plus("open");

1889

} else {

1890

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

1891

if(ret == -1){

1892

perror_plus("fstat");

1893

} else {

1894

if(S_ISREG(st.st_mode)

1895

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

1896

ret = fchown(seckey_fd, uid, gid);

1897

if(ret == -1){

1898

perror_plus("fchown");

1899

}

1900

}

1901

}

1902

TEMP_FAILURE_RETRY(close(seckey_fd));

1903

}

1904

}

1905

1906

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

1907

int pubkey_fd = open(pubkey, O_RDONLY);

1908

if(pubkey_fd == -1){

1909

perror_plus("open");

1910

} else {

1911

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

1912

if(ret == -1){

1913

perror_plus("fstat");

1914

} else {

1915

if(S_ISREG(st.st_mode)

1916

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

1917

ret = fchown(pubkey_fd, uid, gid);

1918

if(ret == -1){

1919

perror_plus("fchown");

1920

}

1921

}

1922

}

1923

TEMP_FAILURE_RETRY(close(pubkey_fd));

1924

}

1925

}

1926

1927

/* Lower privileges */

1928

errno = 0;

1929

ret = seteuid(uid);

1930

if(ret == -1){

1931

perror_plus("seteuid");

1932

}

1933

}

1934

}

1935

1936

/* Run network hooks */

1937

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

1938

goto end;

1017

1939

}

1018

1940

1019

1941

if(not debug){

1020

1942

avahi_set_log_function(empty_log);

1021

1943

}

1022

1944

1945

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

1946

struct dirent **direntries;

1947

/* First look for interfaces that are up */

1948

ret = scandir(sys_class_net, &direntries, up_interface,

1949

alphasort);

1950

if(ret == 0){

1951

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

1952

free(direntries);

1953

ret = scandir(sys_class_net, &direntries, good_interface,

1954

alphasort);

1955

}

1956

if(ret >= 1){

1957

/* Pick the first interface returned */

1958

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

1959

if(debug){

1960

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

1961

}

1962

if(interface == NULL){

1963

perror_plus("malloc");

1964

free(direntries);

1965

exitcode = EXIT_FAILURE;

1966

goto end;

1967

}

1968

free(direntries);

1969

} else {

1970

free(direntries);

1971

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

1972

exitcode = EXIT_FAILURE;

1973

goto end;

1974

}

1975

}

1976

1023

1977

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

1024

1978

from the signal handler */

1025

1979

/* Initialize the pseudo-RNG for Avahi */

1026

1980

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

1027

1981

mc.simple_poll = avahi_simple_poll_new();

1028

1982

if(mc.simple_poll == NULL){

1029

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

1030

exitcode = EXIT_FAILURE;

1983

fprintf_plus(stderr,

1984

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

1985

exitcode = EX_UNAVAILABLE;

1031

1986

goto end;

1032

1987

}

1033

1988

1034

1989

sigemptyset(&sigterm_action.sa_mask);

1035

1990

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

1036

1991

if(ret == -1){

1037

perror("sigaddset");

1038

exitcode = EXIT_FAILURE;

1992

perror_plus("sigaddset");

1993

exitcode = EX_OSERR;

1039

1994

goto end;

1040

1995

}

1041

1996

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

1042

1997

if(ret == -1){

1043

perror("sigaddset");

1044

exitcode = EXIT_FAILURE;

1998

perror_plus("sigaddset");

1999

exitcode = EX_OSERR;

1045

2000

goto end;

1046

2001

}

1047

2002

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

1048

2003

if(ret == -1){

1049

perror("sigaddset");

1050

exitcode = EXIT_FAILURE;

1051

goto end;

1052

}

1053

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

1054

if(ret == -1){

1055

perror("sigaction");

1056

exitcode = EXIT_FAILURE;

1057

goto end;

1058

}

2004

perror_plus("sigaddset");

2005

exitcode = EX_OSERR;

2006

goto end;

2007

}

2008

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

2009

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

2010

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

2011

*/

2012

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

2013

if(ret == -1){

2014

perror_plus("sigaction");

2015

return EX_OSERR;

2016

}

2017

if(old_sigterm_action.sa_handler != SIG_IGN){

2018

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

2019

if(ret == -1){

2020

perror_plus("sigaction");

2021

exitcode = EX_OSERR;

2022

goto end;

2023

}

2024

}

2025

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

2026

if(ret == -1){

2027

perror_plus("sigaction");

2028

return EX_OSERR;

2029

}

2030

if(old_sigterm_action.sa_handler != SIG_IGN){

2031

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

2032

if(ret == -1){

2033

perror_plus("sigaction");

2034

exitcode = EX_OSERR;

2035

goto end;

2036

}

2037

}

2038

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

2039

if(ret == -1){

2040

perror_plus("sigaction");

2041

return EX_OSERR;

2042

}

2043

if(old_sigterm_action.sa_handler != SIG_IGN){

2044

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

2045

if(ret == -1){

2046

perror_plus("sigaction");

2047

exitcode = EX_OSERR;

2048

goto end;

2049

}

2050

}

1059

2051

1060

2052

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

1061

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

1062

#ifdef __linux__

1063

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1064

messages to mess up the prompt */

1065

ret = klogctl(8, NULL, 5);

1066

bool restore_loglevel = true;

1067

if(ret == -1){

1068

restore_loglevel = false;

1069

perror("klogctl");

1070

}

1071

#endif /* __linux__ */

1072

1073

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1074

if(sd < 0){

1075

perror("socket");

1076

exitcode = EXIT_FAILURE;

1077

#ifdef __linux__

1078

if(restore_loglevel){

1079

ret = klogctl(7, NULL, 0);

1080

if(ret == -1){

1081

perror("klogctl");

1082

}

1083

}

1084

#endif /* __linux__ */

1085

goto end;

1086

}

1087

strcpy(network.ifr_name, interface);

1088

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

1089

if(ret == -1){

1090

perror("ioctl SIOCGIFFLAGS");

1091

#ifdef __linux__

1092

if(restore_loglevel){

1093

ret = klogctl(7, NULL, 0);

1094

if(ret == -1){

1095

perror("klogctl");

1096

}

1097

}

1098

#endif /* __linux__ */

1099

exitcode = EXIT_FAILURE;

1100

goto end;

1101

}

1102

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

1103

network.ifr_flags |= IFF_UP;

1104

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

1105

if(ret == -1){

1106

perror("ioctl SIOCSIFFLAGS");

1107

exitcode = EXIT_FAILURE;

1108

#ifdef __linux__

1109

if(restore_loglevel){

1110

ret = klogctl(7, NULL, 0);

1111

if(ret == -1){

1112

perror("klogctl");

1113

}

1114

}

1115

#endif /* __linux__ */

1116

goto end;

1117

}

1118

}

1119

/* sleep checking until interface is running */

1120

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

1121

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

1122

if(ret == -1){

1123

perror("ioctl SIOCGIFFLAGS");

1124

} else if(network.ifr_flags & IFF_RUNNING){

1125

break;

1126

}

1127

struct timespec sleeptime = { .tv_nsec = 250000000 };

1128

ret = nanosleep(&sleeptime, NULL);

1129

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

1130

perror("nanosleep");

1131

}

1132

}

1133

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

1134

if(ret == -1){

1135

perror("close");

1136

}

1137

#ifdef __linux__

1138

if(restore_loglevel){

1139

/* Restores kernel loglevel to default */

1140

ret = klogctl(7, NULL, 0);

1141

if(ret == -1){

1142

perror("klogctl");

1143

}

1144

}

1145

#endif /* __linux__ */

1146

}

1147

1148

uid = getuid();

1149

gid = getgid();

1150

1151

errno = 0;

1152

setgid(gid);

1153

if(ret == -1){

1154

perror("setgid");

1155

}

1156

1157

ret = setuid(uid);

1158

if(ret == -1){

1159

perror("setuid");

2053

if((interface[0] != '\0') and (strcmp(interface, "none") != 0)){

2054

ret = bring_up_interface(interface, delay);

2055

if(ret != 0){

2056

errno = ret;

2057

perror_plus("Failed to bring up interface");

2058

}

2059

}

2060

2061

if(quit_now){

2062

goto end;

1160

2063

}

1161

2064

1162

2065

ret = init_gnutls_global(pubkey, seckey);

1163

2066

if(ret == -1){

1164

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

1165

exitcode = EXIT_FAILURE;

2067

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

2068

exitcode = EX_UNAVAILABLE;

1166

2069

goto end;

1167

2070

} else {

1168

2071

gnutls_initialized = true;

1169

2072

}

1170

2073

2074

if(quit_now){

2075

goto end;

2076

}

2077

1171

2078

if(mkdtemp(tempdir) == NULL){

1172

perror("mkdtemp");

2079

perror_plus("mkdtemp");

1173

2080

goto end;

1174

2081

}

1175

2082

tempdir_created = true;

1176

2083

2084

if(quit_now){

2085

goto end;

2086

}

2087

1177

2088

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

1178

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

1179

exitcode = EXIT_FAILURE;

2089

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

2090

exitcode = EX_UNAVAILABLE;

1180

2091

goto end;

1181

2092

} else {

1182

2093

gpgme_initialized = true;

1183

2094

}

1184

2095

1185

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

1186

if_index = (AvahiIfIndex) if_nametoindex(interface);

1187

if(if_index == 0){

1188

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

1189

exitcode = EXIT_FAILURE;

1190

goto end;

1191

}

2096

if(quit_now){

2097

goto end;

1192

2098

}

1193

2099

1194

2100

if(connect_to != NULL){

1195

2101

/* Connect directly, do not use Zeroconf */

1196

2102

/* (Mainly meant for debugging) */

1197

2103

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

2104

1198

2105

if(address == NULL){

1199

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

1200

exitcode = EXIT_FAILURE;

1201

goto end;

1202

}

2106

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

2107

exitcode = EX_USAGE;

2108

goto end;

2109

}

2110

2111

if(quit_now){

2112

goto end;

2113

}

2114

1203

2115

uint16_t port;

1204

2116

errno = 0;

1205

2117

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

1206

2118

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

1207

2119

or tmpmax != (uint16_t)tmpmax){

1208

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

1209

exitcode = EXIT_FAILURE;

1210

goto end;

1211

}

2120

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

2121

exitcode = EX_USAGE;

2122

goto end;

2123

}

2124

2125

if(quit_now){

2126

goto end;

2127

}

2128

1212

2129

port = (uint16_t)tmpmax;

1213

2130

*address = '\0';

1214

address = connect_to;

1215

2131

/* Colon in address indicates IPv6 */

1216

2132

int af;

1217

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

2133

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

1218

2134

af = AF_INET6;

2135

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

2136

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

2137

{

2138

connect_to++;

2139

address[-1] = '\0';

2140

}

1219

2141

} else {

1220

2142

af = AF_INET;

1221

2143

}

1222

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

1223

if(ret < 0){

1224

exitcode = EXIT_FAILURE;

1225

} else {

2144

address = connect_to;

2145

2146

if(quit_now){

2147

goto end;

2148

}

2149

2150

while(not quit_now){

2151

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

2152

if(quit_now or ret == 0){

2153

break;

2154

}

2155

if(debug){

2156

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

2157

(int)retry_interval);

2158

}

2159

sleep((int)retry_interval);

2160

}

2161

2162

if (not quit_now){

1226

2163

exitcode = EXIT_SUCCESS;

1227

2164

}

1228

goto end;

1229

}

1230

2165

2166

goto end;

2167

}

2168

2169

if(quit_now){

2170

goto end;

2171

}

2172

1231

2173

{

1232

2174

AvahiServerConfig config;

1233

2175

/* Do not publish any local Zeroconf records */

1248

2190

1249

2191

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

1250

2192

if(mc.server == NULL){

1251

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

1252

avahi_strerror(error));

1253

exitcode = EXIT_FAILURE;

2193

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

2194

avahi_strerror(error));

2195

exitcode = EX_UNAVAILABLE;

2196

goto end;

2197

}

2198

2199

if(quit_now){

1254

2200

goto end;

1255

2201

}

1256

2202

1259

2205

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1260

2206

NULL, 0, browse_callback, NULL);

1261

2207

if(sb == NULL){

1262

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

1263

avahi_strerror(avahi_server_errno(mc.server)));

1264

exitcode = EXIT_FAILURE;

2208

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

2209

avahi_strerror(avahi_server_errno(mc.server)));

2210

exitcode = EX_UNAVAILABLE;

2211

goto end;

2212

}

2213

2214

if(quit_now){

1265

2215

goto end;

1266

2216

}

1267

2217

1268

2218

/* Run the main loop */

1269

2219

1270

2220

if(debug){

1271

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

1272

}

1273

1274

avahi_simple_poll_loop(mc.simple_poll);

2221

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

2222

}

2223

2224

ret = avahi_loop_with_timeout(mc.simple_poll,

2225

(int)(retry_interval * 1000));

2226

if(debug){

2227

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

2228

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

2229

}

1275

2230

1276

2231

end:

1277

2232

1278

2233

if(debug){

1279

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

2234

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

1280

2235

}

1281

2236

1282

2237

/* Cleanup things */

1299

2254

gpgme_release(mc.ctx);

1300

2255

}

1301

2256

1302

/* Removes the temp directory used by GPGME */

2257

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

2258

has seen */

2259

if(mc.current_server != NULL){

2260

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

2261

while(mc.current_server != NULL){

2262

server *next = mc.current_server->next;

2263

free(mc.current_server);

2264

mc.current_server = next;

2265

}

2266

}

2267

2268

/* Run network hooks */

2269

run_network_hooks("stop", interface, delay);

2270

2271

/* Re-raise priviliges */

2272

{

2273

raise_privileges();

2274

2275

/* Take down the network interface */

2276

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

2277

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

2278

if(ret == -1){

2279

perror_plus("ioctl SIOCGIFFLAGS");

2280

} else if(network.ifr_flags & IFF_UP){

2281

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

2282

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

2283

if(ret == -1){

2284

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2285

}

2286

}

2287

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

2288

if(ret == -1){

2289

perror_plus("close");

2290

}

2291

}

2292

}

2293

/* Lower privileges permanently */

2294

errno = 0;

2295

ret = setuid(uid);

2296

if(ret == -1){

2297

perror_plus("setuid");

2298

}

2299

2300

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

1303

2301

if(tempdir_created){

1304

DIR *d;

1305

struct dirent *direntry;

1306

d = opendir(tempdir);

1307

if(d == NULL){

1308

if(errno != ENOENT){

1309

perror("opendir");

1310

}

1311

} else {

1312

while(true){

1313

direntry = readdir(d);

1314

if(direntry == NULL){

1315

break;

1316

}

1317

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

1318

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

1319

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

1320

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

1321

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

1322

continue;

1323

}

2302

struct dirent **direntries = NULL;

2303

struct dirent *direntry = NULL;

2304

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

2305

alphasort);

2306

if (numentries > 0){

2307

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

2308

direntry = direntries[i];

1324

2309

char *fullname = NULL;

1325

2310

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

1326

2311

direntry->d_name);

1327

2312

if(ret < 0){

1328

perror("asprintf");

2313

perror_plus("asprintf");

1329

2314

continue;

1330

2315

}

1331

2316

ret = remove(fullname);

1332

2317

if(ret == -1){

1333

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

1334

strerror(errno));

2318

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

2319

strerror(errno));

1335

2320

}

1336

2321

free(fullname);

1337

2322

}

1338

closedir(d);

2323

}

2324

2325

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

2326

free(direntries);

2327

if (numentries == -1){

2328

perror_plus("scandir");

1339

2329

}

1340

2330

ret = rmdir(tempdir);

1341

2331

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

1342

perror("rmdir");

1343

}

2332

perror_plus("rmdir");

2333

}

2334

}

2335

2336

if(quit_now){

2337

sigemptyset(&old_sigterm_action.sa_mask);

2338

old_sigterm_action.sa_handler = SIG_DFL;

2339

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

2340

&old_sigterm_action,

2341

NULL));

2342

if(ret == -1){

2343

perror_plus("sigaction");

2344

}

2345

do {

2346

ret = raise(signal_received);

2347

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

2348

if(ret != 0){

2349

perror_plus("raise");

2350

abort();

2351

}

2352

TEMP_FAILURE_RETRY(pause());

1344

2353

}

1345

2354

1346

2355

return exitcode;