/mandos/release : revision 237.16.11

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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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#ifndef _LARGEFILE_SOURCE

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34

#define _LARGEFILE_SOURCE

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#endif

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#ifndef _FILE_OFFSET_BITS

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#define _FILE_OFFSET_BITS 64

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#endif

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

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stdout, ferror(), remove() */

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

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

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

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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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#ifdef __linux__

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

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110

init_gnutls_session(),

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111

GNUTLS_* */

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112

#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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115

107

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/* GPGME */

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117

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

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125

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

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126

#define SECKEY "seckey.txt"

118

127

#define PUBKEY "pubkey.txt"

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

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129

120

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bool debug = false;

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131

static const char mandos_protocol_version[] = "1";

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132

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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138

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

139

typedef struct server{

140

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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148

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

126

150

typedef struct {

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155

gnutls_dh_params_t dh_params;

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156

const char *priority;

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157

gpgme_ctx_t ctx;

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server *current_server;

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} mandos_context;

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160

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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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163

.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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167

sig_atomic_t quit_now = 0;

168

int signal_received = 0;

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170

/* Function to use when printing errors */

171

void perror_plus(const char *print_text){

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

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program_invocation_short_name);

174

perror(print_text);

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}

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177

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

178

va_list ap;

179

va_start (ap, format);

180

181

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

182

program_invocation_short_name));

183

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

184

}

140

185

141

186

/*

142

187

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

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189

* "buffer_length" is how much is already used.

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190

*/

146

191

size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

192

size_t buffer_capacity){

148

193

if(buffer_length + BUFFER_SIZE > buffer_capacity){

149

194

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

150

195

if(buffer == NULL){

155

200

return buffer_capacity;

156

201

}

157

202

203

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

204

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

205

int af){

206

int ret;

207

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

208

if(new_server == NULL){

209

perror_plus("malloc");

210

return -1;

211

}

212

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

213

.port = port,

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.if_index = if_index,

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.af = af };

216

if(new_server->ip == NULL){

217

perror_plus("strdup");

218

return -1;

219

}

220

/* Special case of first server */

221

if (mc.current_server == NULL){

222

new_server->next = new_server;

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new_server->prev = new_server;

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mc.current_server = new_server;

225

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

226

} else {

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new_server->next = mc.current_server;

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

229

new_server->prev->next = new_server;

230

mc.current_server->prev = new_server;

231

}

232

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

233

if(ret == -1){

234

perror_plus("clock_gettime");

235

return -1;

236

}

237

return 0;

238

}

239

158

240

/*

159

241

* Initialize GPGME.

160

242

*/

161

static bool init_gpgme(const char *seckey,

162

const char *pubkey, const char *tempdir){

163

int ret;

243

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

244

const char *tempdir){

164

245

gpgme_error_t rc;

165

246

gpgme_engine_info_t engine_info;

166

247

169

250

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

170

251

*/

171

252

bool import_key(const char *filename){

253

int ret;

172

254

int fd;

173

255

gpgme_data_t pgp_data;

174

256

175

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

176

258

if(fd == -1){

177

perror("open");

259

perror_plus("open");

178

260

return false;

179

261

}

180

262

181

263

rc = gpgme_data_new_from_fd(&pgp_data, fd);

182

264

if(rc != GPG_ERR_NO_ERROR){

183

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

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gpgme_strsource(rc), gpgme_strerror(rc));

265

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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267

return false;

186

268

}

187

269

188

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rc = gpgme_op_import(mc.ctx, pgp_data);

189

271

if(rc != GPG_ERR_NO_ERROR){

190

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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275

}

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

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if(ret == -1){

197

perror("close");

279

perror_plus("close");

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280

}

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gpgme_data_release(pgp_data);

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return true;

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283

}

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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));

293

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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296

}

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297

216

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

298

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

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299

rc = gpgme_get_engine_info(&engine_info);

218

300

if(rc != GPG_ERR_NO_ERROR){

219

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

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gpgme_strsource(rc), gpgme_strerror(rc));

301

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

302

gpgme_strsource(rc), gpgme_strerror(rc));

221

303

return false;

222

304

}

223

305

while(engine_info != NULL){

229

311

engine_info = engine_info->next;

230

312

}

231

313

if(engine_info == NULL){

232

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

314

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

315

tempdir);

233

316

return false;

234

317

}

235

318

236

319

/* Create new GPGME "context" */

237

320

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

238

321

if(rc != GPG_ERR_NO_ERROR){

239

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

240

gpgme_strsource(rc), gpgme_strerror(rc));

322

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

323

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

324

gpgme_strerror(rc));

241

325

return false;

242

326

}

243

327

245

329

return false;

246

330

}

247

331

248

return true;

332

return true;

249

333

}

250

334

251

335

/*

262

346

ssize_t plaintext_length = 0;

263

347

264

348

if(debug){

265

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

349

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

266

350

}

267

351

268

352

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

269

353

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

270

354

0);

271

355

if(rc != GPG_ERR_NO_ERROR){

272

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

273

gpgme_strsource(rc), gpgme_strerror(rc));

356

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

357

gpgme_strsource(rc), gpgme_strerror(rc));

274

358

return -1;

275

359

}

276

360

277

361

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

278

362

rc = gpgme_data_new(&dh_plain);

279

363

if(rc != GPG_ERR_NO_ERROR){

280

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

281

gpgme_strsource(rc), gpgme_strerror(rc));

364

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

365

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

366

gpgme_strsource(rc), gpgme_strerror(rc));

282

367

gpgme_data_release(dh_crypto);

283

368

return -1;

284

369

}

287

372

data buffer */

288

373

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

289

374

if(rc != GPG_ERR_NO_ERROR){

290

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

291

gpgme_strsource(rc), gpgme_strerror(rc));

375

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

376

gpgme_strsource(rc), gpgme_strerror(rc));

292

377

plaintext_length = -1;

293

378

if(debug){

294

379

gpgme_decrypt_result_t result;

295

380

result = gpgme_op_decrypt_result(mc.ctx);

296

381

if(result == NULL){

297

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

382

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

298

383

} else {

299

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

300

result->unsupported_algorithm);

301

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

302

result->wrong_key_usage);

384

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

385

result->unsupported_algorithm);

386

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

387

result->wrong_key_usage);

303

388

if(result->file_name != NULL){

304

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

389

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

305

390

}

306

391

gpgme_recipient_t recipient;

307

392

recipient = result->recipients;

308

if(recipient){

309

while(recipient != NULL){

310

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

311

gpgme_pubkey_algo_name(recipient->pubkey_algo));

312

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

313

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

314

recipient->status == GPG_ERR_NO_SECKEY

315

? "No" : "Yes");

316

recipient = recipient->next;

317

}

393

while(recipient != NULL){

394

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

395

gpgme_pubkey_algo_name

396

(recipient->pubkey_algo));

397

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

398

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

399

recipient->status == GPG_ERR_NO_SECKEY

400

? "No" : "Yes");

401

recipient = recipient->next;

318

402

}

319

403

}

320

404

}

322

406

}

323

407

324

408

if(debug){

325

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

409

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

326

410

}

327

411

328

412

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

329

413

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

330

perror("gpgme_data_seek");

414

perror_plus("gpgme_data_seek");

331

415

plaintext_length = -1;

332

416

goto decrypt_end;

333

417

}

335

419

*plaintext = NULL;

336

420

while(true){

337

421

plaintext_capacity = incbuffer(plaintext,

338

(size_t)plaintext_length,

339

plaintext_capacity);

422

(size_t)plaintext_length,

423

plaintext_capacity);

340

424

if(plaintext_capacity == 0){

341

perror("incbuffer");

342

plaintext_length = -1;

343

goto decrypt_end;

425

perror_plus("incbuffer");

426

plaintext_length = -1;

427

goto decrypt_end;

344

428

}

345

429

346

430

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

351

435

break;

352

436

}

353

437

if(ret < 0){

354

perror("gpgme_data_read");

438

perror_plus("gpgme_data_read");

355

439

plaintext_length = -1;

356

440

goto decrypt_end;

357

441

}

359

443

}

360

444

361

445

if(debug){

362

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

446

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

363

447

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

364

448

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

365

449

}

387

471

/* GnuTLS log function callback */

388

472

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

389

473

const char* string){

390

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

474

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

391

475

}

392

476

393

477

static int init_gnutls_global(const char *pubkeyfilename,

395

479

int ret;

396

480

397

481

if(debug){

398

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

482

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

399

483

}

400

484

401

485

ret = gnutls_global_init();

402

486

if(ret != GNUTLS_E_SUCCESS){

403

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

404

safer_gnutls_strerror(ret));

487

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

488

safer_gnutls_strerror(ret));

405

489

return -1;

406

490

}

407

491

414

498

}

415

499

416

500

/* OpenPGP credentials */

417

gnutls_certificate_allocate_credentials(&mc.cred);

501

ret = gnutls_certificate_allocate_credentials(&mc.cred);

418

502

if(ret != GNUTLS_E_SUCCESS){

419

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

420

from

421

-Wunreachable-code

422

*/

423

safer_gnutls_strerror(ret));

503

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

504

safer_gnutls_strerror(ret));

424

505

gnutls_global_deinit();

425

506

return -1;

426

507

}

427

508

428

509

if(debug){

429

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

430

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

431

seckeyfilename);

510

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

511

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

512

pubkeyfilename,

513

seckeyfilename);

432

514

}

433

515

434

516

ret = gnutls_certificate_set_openpgp_key_file

435

517

(mc.cred, pubkeyfilename, seckeyfilename,

436

518

GNUTLS_OPENPGP_FMT_BASE64);

437

519

if(ret != GNUTLS_E_SUCCESS){

438

fprintf(stderr,

439

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

440

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

441

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

442

safer_gnutls_strerror(ret));

520

fprintf_plus(stderr,

521

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

522

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

523

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

524

safer_gnutls_strerror(ret));

443

525

goto globalfail;

444

526

}

445

527

446

528

/* GnuTLS server initialization */

447

529

ret = gnutls_dh_params_init(&mc.dh_params);

448

530

if(ret != GNUTLS_E_SUCCESS){

449

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

450

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

531

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

532

" initialization: %s\n",

533

safer_gnutls_strerror(ret));

451

534

goto globalfail;

452

535

}

453

536

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

454

537

if(ret != GNUTLS_E_SUCCESS){

455

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

456

safer_gnutls_strerror(ret));

538

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

539

safer_gnutls_strerror(ret));

457

540

goto globalfail;

458

541

}

459

542

472

555

static int init_gnutls_session(gnutls_session_t *session){

473

556

int ret;

474

557

/* GnuTLS session creation */

475

ret = gnutls_init(session, GNUTLS_SERVER);

558

do {

559

ret = gnutls_init(session, GNUTLS_SERVER);

560

if(quit_now){

561

return -1;

562

}

563

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

476

564

if(ret != GNUTLS_E_SUCCESS){

477

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

478

safer_gnutls_strerror(ret));

565

fprintf_plus(stderr,

566

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

567

safer_gnutls_strerror(ret));

479

568

}

480

569

481

570

{

482

571

const char *err;

483

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

572

do {

573

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

574

if(quit_now){

575

gnutls_deinit(*session);

576

return -1;

577

}

578

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

484

579

if(ret != GNUTLS_E_SUCCESS){

485

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

486

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

487

safer_gnutls_strerror(ret));

580

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

581

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

582

safer_gnutls_strerror(ret));

488

583

gnutls_deinit(*session);

489

584

return -1;

490

585

}

491

586

}

492

587

493

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

494

mc.cred);

588

do {

589

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

590

mc.cred);

591

if(quit_now){

592

gnutls_deinit(*session);

593

return -1;

594

}

595

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

495

596

if(ret != GNUTLS_E_SUCCESS){

496

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

497

safer_gnutls_strerror(ret));

597

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

598

safer_gnutls_strerror(ret));

498

599

gnutls_deinit(*session);

499

600

return -1;

500

601

}

501

602

502

603

/* ignore client certificate if any. */

503

gnutls_certificate_server_set_request(*session,

504

GNUTLS_CERT_IGNORE);

604

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

505

605

506

606

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

507

607

516

616

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

517

617

AvahiIfIndex if_index,

518

618

int af){

519

int ret, tcp_sd;

619

int ret, tcp_sd = -1;

520

620

ssize_t sret;

521

621

union {

522

622

struct sockaddr_in in;

523

623

struct sockaddr_in6 in6;

524

624

} to;

525

625

char *buffer = NULL;

526

char *decrypted_buffer;

626

char *decrypted_buffer = NULL;

527

627

size_t buffer_length = 0;

528

628

size_t buffer_capacity = 0;

529

ssize_t decrypted_buffer_size;

530

629

size_t written;

531

int retval = 0;

630

int retval = -1;

532

631

gnutls_session_t session;

533

632

int pf; /* Protocol family */

534

633

634

errno = 0;

635

636

if(quit_now){

637

errno = EINTR;

638

return -1;

639

}

640

535

641

switch(af){

536

642

case AF_INET6:

537

643

pf = PF_INET6;

540

646

pf = PF_INET;

541

647

break;

542

648

default:

543

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

649

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

650

errno = EINVAL;

544

651

return -1;

545

652

}

546

653

550

657

}

551

658

552

659

if(debug){

553

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

554

"\n", ip, port);

660

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

661

PRIu16 "\n", ip, port);

555

662

}

556

663

557

664

tcp_sd = socket(pf, SOCK_STREAM, 0);

558

665

if(tcp_sd < 0){

559

perror("socket");

560

return -1;

666

int e = errno;

667

perror_plus("socket");

668

errno = e;

669

goto mandos_end;

670

}

671

672

if(quit_now){

673

errno = EINTR;

674

goto mandos_end;

561

675

}

562

676

563

677

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

564

678

if(af == AF_INET6){

565

to.in6.sin6_family = (uint16_t)af;

679

to.in6.sin6_family = (sa_family_t)af;

566

680

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

567

681

} else { /* IPv4 */

568

682

to.in.sin_family = (sa_family_t)af;

569

683

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

570

684

}

571

685

if(ret < 0 ){

572

perror("inet_pton");

573

return -1;

686

int e = errno;

687

perror_plus("inet_pton");

688

errno = e;

689

goto mandos_end;

574

690

}

575

691

if(ret == 0){

576

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

577

return -1;

692

int e = errno;

693

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

694

errno = e;

695

goto mandos_end;

578

696

}

579

697

if(af == AF_INET6){

580

698

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

583

701

584

702

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

585

703

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

586

-Wunreachable-code*/

704

-Wunreachable-code*/

587

705

if(if_index == AVAHI_IF_UNSPEC){

588

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

589

" without a network interface\n");

590

return -1;

706

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

707

" incomplete without a network interface\n");

708

errno = EINVAL;

709

goto mandos_end;

591

710

}

592

711

/* Set the network interface number as scope */

593

712

to.in6.sin6_scope_id = (uint32_t)if_index;

598

717

-Wunreachable-code */

599

718

}

600

719

720

if(quit_now){

721

errno = EINTR;

722

goto mandos_end;

723

}

724

601

725

if(debug){

602

726

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

603

727

char interface[IF_NAMESIZE];

604

728

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

605

perror("if_indextoname");

729

perror_plus("if_indextoname");

606

730

} else {

607

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

608

ip, interface, port);

731

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

732

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

609

733

}

610

734

} else {

611

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

612

port);

735

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

736

ip, port);

613

737

}

614

738

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

615

739

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

622

746

sizeof(addrstr));

623

747

}

624

748

if(pcret == NULL){

625

perror("inet_ntop");

749

perror_plus("inet_ntop");

626

750

} else {

627

751

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

628

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

752

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

629

753

}

630

754

}

631

755

}

632

756

757

if(quit_now){

758

errno = EINTR;

759

goto mandos_end;

760

}

761

633

762

if(af == AF_INET6){

634

763

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

635

764

} else {

636

765

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

637

766

}

638

767

if(ret < 0){

639

perror("connect");

640

return -1;

768

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

769

int e = errno;

770

perror_plus("connect");

771

errno = e;

772

}

773

goto mandos_end;

774

}

775

776

if(quit_now){

777

errno = EINTR;

778

goto mandos_end;

641

779

}

642

780

643

781

const char *out = mandos_protocol_version;

645

783

while(true){

646

784

size_t out_size = strlen(out);

647

785

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

648

out_size - written));

786

out_size - written));

649

787

if(ret == -1){

650

perror("write");

651

retval = -1;

788

int e = errno;

789

perror_plus("write");

790

errno = e;

652

791

goto mandos_end;

653

792

}

654

793

written += (size_t)ret;

662

801

break;

663

802

}

664

803

}

804

805

if(quit_now){

806

errno = EINTR;

807

goto mandos_end;

808

}

665

809

}

666

810

667

811

if(debug){

668

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

669

}

670

812

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

813

}

814

815

if(quit_now){

816

errno = EINTR;

817

goto mandos_end;

818

}

819

820

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

671

821

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

672

822

673

do{

823

if(quit_now){

824

errno = EINTR;

825

goto mandos_end;

826

}

827

828

do {

674

829

ret = gnutls_handshake(session);

830

if(quit_now){

831

errno = EINTR;

832

goto mandos_end;

833

}

675

834

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

676

835

677

836

if(ret != GNUTLS_E_SUCCESS){

678

837

if(debug){

679

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

838

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

680

839

gnutls_perror(ret);

681

840

}

682

retval = -1;

841

errno = EPROTO;

683

842

goto mandos_end;

684

843

}

685

844

686

845

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

687

846

688

847

if(debug){

689

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

690

ip);

848

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

849

" %s\n", ip);

691

850

}

692

851

693

852

while(true){

853

854

if(quit_now){

855

errno = EINTR;

856

goto mandos_end;

857

}

858

694

859

buffer_capacity = incbuffer(&buffer, buffer_length,

695

buffer_capacity);

860

buffer_capacity);

696

861

if(buffer_capacity == 0){

697

perror("incbuffer");

698

retval = -1;

862

int e = errno;

863

perror_plus("incbuffer");

864

errno = e;

865

goto mandos_end;

866

}

867

868

if(quit_now){

869

errno = EINTR;

699

870

goto mandos_end;

700

871

}

701

872

710

881

case GNUTLS_E_AGAIN:

711

882

break;

712

883

case GNUTLS_E_REHANDSHAKE:

713

do{

884

do {

714

885

ret = gnutls_handshake(session);

886

887

if(quit_now){

888

errno = EINTR;

889

goto mandos_end;

890

}

715

891

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

716

892

if(ret < 0){

717

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

893

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

894

"***\n");

718

895

gnutls_perror(ret);

719

retval = -1;

896

errno = EPROTO;

720

897

goto mandos_end;

721

898

}

722

899

break;

723

900

default:

724

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

725

" encrypted session with Mandos server\n");

726

retval = -1;

901

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

902

" encrypted session with Mandos server\n");

727

903

gnutls_bye(session, GNUTLS_SHUT_RDWR);

904

errno = EIO;

728

905

goto mandos_end;

729

906

}

730

907

} else {

733

910

}

734

911

735

912

if(debug){

736

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

737

}

738

739

gnutls_bye(session, GNUTLS_SHUT_RDWR);

913

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

914

}

915

916

if(quit_now){

917

errno = EINTR;

918

goto mandos_end;

919

}

920

921

do {

922

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

923

if(quit_now){

924

errno = EINTR;

925

goto mandos_end;

926

}

927

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

740

928

741

929

if(buffer_length > 0){

742

decrypted_buffer_size = pgp_packet_decrypt(buffer,

743

buffer_length,

930

ssize_t decrypted_buffer_size;

931

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

744

932

&decrypted_buffer);

745

933

if(decrypted_buffer_size >= 0){

934

746

935

written = 0;

747

936

while(written < (size_t) decrypted_buffer_size){

937

if(quit_now){

938

errno = EINTR;

939

goto mandos_end;

940

}

941

748

942

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

749

943

(size_t)decrypted_buffer_size - written,

750

944

stdout);

751

945

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

946

int e = errno;

752

947

if(debug){

753

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

754

strerror(errno));

948

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

949

strerror(errno));

755

950

}

756

retval = -1;

757

break;

951

errno = e;

952

goto mandos_end;

758

953

}

759

954

written += (size_t)ret;

760

955

}

761

free(decrypted_buffer);

762

} else {

763

retval = -1;

956

retval = 0;

764

957

}

765

} else {

766

retval = -1;

767

958

}

768

959

769

960

/* Shutdown procedure */

770

961

771

962

mandos_end:

772

free(buffer);

773

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

774

if(ret == -1){

775

perror("close");

963

{

964

int e = errno;

965

free(decrypted_buffer);

966

free(buffer);

967

if(tcp_sd >= 0){

968

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

969

}

970

if(ret == -1){

971

if(e == 0){

972

e = errno;

973

}

974

perror_plus("close");

975

}

976

gnutls_deinit(session);

977

errno = e;

978

if(quit_now){

979

errno = EINTR;

980

retval = -1;

981

}

776

982

}

777

gnutls_deinit(session);

778

983

return retval;

779

984

}

780

985

797

1002

/* Called whenever a service has been resolved successfully or

798

1003

timed out */

799

1004

1005

if(quit_now){

1006

return;

1007

}

1008

800

1009

switch(event){

801

1010

default:

802

1011

case AVAHI_RESOLVER_FAILURE:

803

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

804

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

805

avahi_strerror(avahi_server_errno(mc.server)));

1012

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

1013

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

1014

domain,

1015

avahi_strerror(avahi_server_errno(mc.server)));

806

1016

break;

807

1017

808

1018

case AVAHI_RESOLVER_FOUND:

810

1020

char ip[AVAHI_ADDRESS_STR_MAX];

811

1021

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

812

1022

if(debug){

813

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

814

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

815

ip, (intmax_t)interface, port);

1023

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

1024

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

1025

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

816

1026

}

817

1027

int ret = start_mandos_communication(ip, port, interface,

818

1028

avahi_proto_to_af(proto));

819

1029

if(ret == 0){

820

1030

avahi_simple_poll_quit(mc.simple_poll);

1031

} else {

1032

ret = add_server(ip, port, interface,

1033

avahi_proto_to_af(proto));

821

1034

}

822

1035

}

823

1036

}

839

1052

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

840

1053

is removed from the LAN */

841

1054

1055

if(quit_now){

1056

return;

1057

}

1058

842

1059

switch(event){

843

1060

default:

844

1061

case AVAHI_BROWSER_FAILURE:

845

1062

846

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

847

avahi_strerror(avahi_server_errno(mc.server)));

1063

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

1064

avahi_strerror(avahi_server_errno(mc.server)));

848

1065

avahi_simple_poll_quit(mc.simple_poll);

849

1066

return;

850

1067

857

1074

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

858

1075

name, type, domain, protocol, 0,

859

1076

resolve_callback, NULL) == NULL)

860

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

861

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

1077

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

1078

" %s\n", name,

1079

avahi_strerror(avahi_server_errno(mc.server)));

862

1080

break;

863

1081

864

1082

case AVAHI_BROWSER_REMOVE:

867

1085

case AVAHI_BROWSER_ALL_FOR_NOW:

868

1086

case AVAHI_BROWSER_CACHE_EXHAUSTED:

869

1087

if(debug){

870

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

1088

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

1089

" searching...\n");

871

1090

}

872

1091

break;

873

1092

}

874

1093

}

875

1094

876

sig_atomic_t quit_now = 0;

877

878

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

879

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

1095

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

1096

static void handle_sigterm(int sig){

880

1097

if(quit_now){

881

1098

return;

882

1099

}

883

1100

quit_now = 1;

1101

signal_received = sig;

884

1102

int old_errno = errno;

1103

/* set main loop to exit */

885

1104

if(mc.simple_poll != NULL){

886

1105

avahi_simple_poll_quit(mc.simple_poll);

887

1106

}

888

1107

errno = old_errno;

889

1108

}

890

1109

1110

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

1111

int ret;

1112

1113

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

1114

if(s < 0){

1115

perror_plus("socket");

1116

return false;

1117

}

1118

strcpy(ifr->ifr_name, ifname);

1119

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1120

if(ret == -1){

1121

if(debug){

1122

perror_plus("ioctl SIOCGIFFLAGS");

1123

}

1124

return false;

1125

}

1126

return true;

1127

}

1128

1129

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

1130

1131

/* Reject the loopback device */

1132

if(ifr->ifr_flags & IFF_LOOPBACK){

1133

if(debug){

1134

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

1135

ifname);

1136

}

1137

return false;

1138

}

1139

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

1140

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

1141

if(debug){

1142

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

1143

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

1144

}

1145

return true;

1146

}

1147

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

1148

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

1149

if(debug){

1150

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1151

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

1152

}

1153

return false;

1154

}

1155

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

1156

if(ifr->ifr_flags & IFF_NOARP){

1157

if(debug){

1158

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

1159

ifname);

1160

}

1161

return false;

1162

}

1163

1164

/* Accept this device */

1165

if(debug){

1166

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

1167

}

1168

return true;

1169

}

1170

1171

/*

1172

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

1173

* corresponds to an acceptable network device.

1174

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

1175

*/

1176

int good_interface(const struct dirent *if_entry){

1177

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

1178

return 0;

1179

}

1180

1181

struct ifreq ifr;

1182

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

1183

if(debug){

1184

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

1185

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

1186

}

1187

return 0;

1188

}

1189

1190

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

1191

return 0;

1192

}

1193

return 1;

1194

}

1195

1196

/*

1197

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

1198

* corresponds to an acceptable network device which is up.

1199

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

1200

*/

1201

int up_interface(const struct dirent *if_entry){

1202

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

1203

return 0;

1204

}

1205

1206

struct ifreq ifr;

1207

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

1208

if(debug){

1209

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

1210

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

1211

}

1212

return 0;

1213

}

1214

1215

/* Reject down interfaces */

1216

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

1217

if(debug){

1218

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

1219

if_entry->d_name);

1220

}

1221

return 0;

1222

}

1223

1224

/* Reject non-running interfaces */

1225

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

1226

if(debug){

1227

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

1228

if_entry->d_name);

1229

}

1230

return 0;

1231

}

1232

1233

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

1234

return 0;

1235

}

1236

return 1;

1237

}

1238

1239

int notdotentries(const struct dirent *direntry){

1240

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

1241

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

1242

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

1243

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

1244

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

1245

return 0;

1246

}

1247

return 1;

1248

}

1249

1250

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

1251

int runnable_hook(const struct dirent *direntry){

1252

int ret;

1253

size_t sret;

1254

struct stat st;

1255

1256

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

1257

/* Empty name? */

1258

return 0;

1259

}

1260

1261

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

1262

"abcdefghijklmnopqrstuvwxyz"

1263

"0123456789"

1264

"_-");

1265

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

1266

/* Contains non-allowed characters */

1267

if(debug){

1268

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

1269

direntry->d_name);

1270

}

1271

return 0;

1272

}

1273

1274

char *fullname = NULL;

1275

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

1276

if(ret < 0){

1277

perror_plus("asprintf");

1278

return 0;

1279

}

1280

1281

ret = stat(fullname, &st);

1282

if(ret == -1){

1283

if(debug){

1284

perror_plus("Could not stat hook");

1285

}

1286

return 0;

1287

}

1288

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

1289

/* Not a regular file */

1290

if(debug){

1291

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

1292

direntry->d_name);

1293

}

1294

return 0;

1295

}

1296

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

1297

/* Not executable */

1298

if(debug){

1299

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

1300

direntry->d_name);

1301

}

1302

return 0;

1303

}

1304

return 1;

1305

}

1306

1307

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1308

int ret;

1309

struct timespec now;

1310

struct timespec waited_time;

1311

intmax_t block_time;

1312

1313

while(true){

1314

if(mc.current_server == NULL){

1315

if (debug){

1316

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

1317

" No timeout!\n");

1318

}

1319

ret = avahi_simple_poll_iterate(s, -1);

1320

} else {

1321

if (debug){

1322

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

1323

" it, or wait\n");

1324

}

1325

/* the current time */

1326

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1327

if(ret == -1){

1328

perror_plus("clock_gettime");

1329

return -1;

1330

}

1331

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

1332

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

1333

waited_time.tv_sec = (now.tv_sec

1334

- mc.current_server->last_seen.tv_sec);

1335

waited_time.tv_nsec = (now.tv_nsec

1336

- mc.current_server->last_seen.tv_nsec);

1337

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

1338

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

1339

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

1340

block_time = ((retry_interval

1341

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

1342

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

1343

1344

if (debug){

1345

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

1346

block_time);

1347

}

1348

1349

if(block_time <= 0){

1350

ret = start_mandos_communication(mc.current_server->ip,

1351

mc.current_server->port,

1352

mc.current_server->if_index,

1353

mc.current_server->af);

1354

if(ret == 0){

1355

avahi_simple_poll_quit(mc.simple_poll);

1356

return 0;

1357

}

1358

ret = clock_gettime(CLOCK_MONOTONIC,

1359

&mc.current_server->last_seen);

1360

if(ret == -1){

1361

perror_plus("clock_gettime");

1362

return -1;

1363

}

1364

mc.current_server = mc.current_server->next;

1365

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

1366

servers, but don't block */

1367

}

1368

1369

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

1370

}

1371

if(ret != 0){

1372

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

1373

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

1374

}

1375

}

1376

}

1377

}

1378

1379

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

1380

const float delay){

1381

struct dirent **direntries;

1382

struct dirent *direntry;

1383

int ret;

1384

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

1385

alphasort);

1386

if(numhooks == -1){

1387

perror_plus("scandir");

1388

} else {

1389

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

1390

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

1391

direntry = direntries[i];

1392

char *fullname = NULL;

1393

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

1394

if(ret < 0){

1395

perror_plus("asprintf");

1396

continue;

1397

}

1398

if(debug){

1399

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

1400

direntry->d_name);

1401

}

1402

pid_t hook_pid = fork();

1403

if(hook_pid == 0){

1404

/* Child */

1405

dup2(devnull, STDIN_FILENO);

1406

close(devnull);

1407

dup2(STDERR_FILENO, STDOUT_FILENO);

1408

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

1409

if(ret == -1){

1410

perror_plus("setenv");

1411

return false;

1412

}

1413

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

1414

if(ret == -1){

1415

perror_plus("setenv");

1416

return false;

1417

}

1418

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

1419

if(ret == -1){

1420

perror_plus("setenv");

1421

return false;

1422

}

1423

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

1424

if(ret == -1){

1425

perror_plus("setenv");

1426

return false;

1427

}

1428

char *delaystring;

1429

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

1430

if(ret == -1){

1431

perror_plus("asprintf");

1432

return false;

1433

}

1434

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

1435

if(ret == -1){

1436

free(delaystring);

1437

perror_plus("setenv");

1438

return false;

1439

}

1440

free(delaystring);

1441

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

1442

perror_plus("execl");

1443

} else {

1444

int status;

1445

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

1446

perror_plus("waitpid");

1447

free(fullname);

1448

continue;

1449

}

1450

if(WIFEXITED(status)){

1451

if(WEXITSTATUS(status) != 0){

1452

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

1453

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

1454

WEXITSTATUS(status));

1455

free(fullname);

1456

continue;

1457

}

1458

} else if(WIFSIGNALED(status)){

1459

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

1460

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

1461

WTERMSIG(status));

1462

free(fullname);

1463

continue;

1464

} else {

1465

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

1466

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

1467

free(fullname);

1468

continue;

1469

}

1470

}

1471

free(fullname);

1472

if(quit_now){

1473

break;

1474

}

1475

}

1476

close(devnull);

1477

}

1478

return true;

1479

}

1480

891

1481

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

892

1482

AvahiSServiceBrowser *sb = NULL;

893

1483

int error;

895

1485

intmax_t tmpmax;

896

1486

char *tmp;

897

1487

int exitcode = EXIT_SUCCESS;

898

const char *interface = "eth0";

1488

const char *interface = "";

899

1489

struct ifreq network;

900

int sd;

1490

int sd = -1;

1491

bool take_down_interface = false;

901

1492

uid_t uid;

902

1493

gid_t gid;

903

char *connect_to = NULL;

904

1494

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

905

1495

bool tempdir_created = false;

906

1496

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

910

1500

bool gnutls_initialized = false;

911

1501

bool gpgme_initialized = false;

912

1502

float delay = 2.5f;

1503

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

1504

retrying the same server again */

913

1505

914

struct sigaction old_sigterm_action;

1506

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

915

1507

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

916

1508

1509

uid = getuid();

1510

gid = getgid();

1511

1512

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

1513

errno = 0;

1514

ret = setgid(gid);

1515

if(ret == -1){

1516

perror_plus("setgid");

1517

}

1518

1519

/* Lower user privileges (temporarily) */

1520

errno = 0;

1521

ret = seteuid(uid);

1522

if(ret == -1){

1523

perror_plus("seteuid");

1524

}

1525

1526

if(quit_now){

1527

goto end;

1528

}

1529

917

1530

{

918

1531

struct argp_option options[] = {

919

1532

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

948

1561

.arg = "SECONDS",

949

1562

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

950

1563

.group = 2 },

1564

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

1565

.arg = "SECONDS",

1566

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

1567

.group = 2 },

1568

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

1569

.arg = "DIR",

1570

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

1571

.group = 2 },

1572

/*

1573

* These reproduce what we would get without ARGP_NO_HELP

1574

*/

1575

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

1576

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

1577

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

1578

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

1579

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

1580

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

951

1581

{ .name = NULL }

952

1582

};

953

1583

954

1584

error_t parse_opt(int key, char *arg,

955

1585

struct argp_state *state){

1586

errno = 0;

956

1587

switch(key){

957

1588

case 128: /* --debug */

958

1589

debug = true;

974

1605

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

975

1606

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

976

1607

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

977

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

978

exit(EXIT_FAILURE);

1608

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

979

1609

}

980

1610

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

981

1611

break;

986

1616

errno = 0;

987

1617

delay = strtof(arg, &tmp);

988

1618

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

989

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

990

exit(EXIT_FAILURE);

991

}

992

break;

993

case ARGP_KEY_ARG:

994

argp_usage(state);

995

case ARGP_KEY_END:

1619

argp_error(state, "Bad delay");

1620

}

1621

case 132: /* --retry */

1622

errno = 0;

1623

retry_interval = strtod(arg, &tmp);

1624

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

1625

or (retry_interval * 1000) > INT_MAX

1626

or retry_interval < 0){

1627

argp_error(state, "Bad retry interval");

1628

}

1629

break;

1630

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

1631

hookdir = arg;

1632

break;

1633

/*

1634

* These reproduce what we would get without ARGP_NO_HELP

1635

*/

1636

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

1637

argp_state_help(state, state->out_stream,

1638

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1639

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1640

case -3: /* --usage */

1641

argp_state_help(state, state->out_stream,

1642

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1643

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

1644

fprintf_plus(state->out_stream,

1645

"Mandos plugin mandos-client: ");

1646

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

1647

exit(argp_err_exit_status);

996

1648

break;

997

1649

default:

998

1650

return ARGP_ERR_UNKNOWN;

999

1651

}

1000

return 0;

1652

return errno;

1001

1653

}

1002

1654

1003

1655

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

1004

1656

.args_doc = "",

1005

1657

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

1006

1658

" passwords from a Mandos server" };

1007

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

1008

if(ret == ARGP_ERR_UNKNOWN){

1009

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

1010

exitcode = EXIT_FAILURE;

1011

goto end;

1659

ret = argp_parse(&argp, argc, argv,

1660

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1661

switch(ret){

1662

case 0:

1663

break;

1664

case ENOMEM:

1665

default:

1666

errno = ret;

1667

perror_plus("argp_parse");

1668

exitcode = EX_OSERR;

1669

goto end;

1670

case EINVAL:

1671

exitcode = EX_USAGE;

1672

goto end;

1673

}

1674

}

1675

1676

if(getuid() == 0){

1677

/* Work around Debian bug #633582:

1678

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

1679

struct stat st;

1680

1681

/* Re-raise priviliges */

1682

errno = 0;

1683

ret = seteuid(0);

1684

if(ret == -1){

1685

perror_plus("seteuid");

1686

}

1687

1688

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

1689

int seckey_fd = open(seckey, O_RDONLY);

1690

if(seckey_fd == -1){

1691

perror_plus("open");

1692

} else {

1693

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

1694

if(ret == -1){

1695

perror_plus("fstat");

1696

} else {

1697

if(S_ISREG(st.st_mode)

1698

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

1699

ret = fchown(seckey_fd, uid, gid);

1700

if(ret == -1){

1701

perror_plus("fchown");

1702

}

1703

}

1704

}

1705

TEMP_FAILURE_RETRY(close(seckey_fd));

1706

}

1707

}

1708

1709

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

1710

int pubkey_fd = open(pubkey, O_RDONLY);

1711

if(pubkey_fd == -1){

1712

perror_plus("open");

1713

} else {

1714

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

1715

if(ret == -1){

1716

perror_plus("fstat");

1717

} else {

1718

if(S_ISREG(st.st_mode)

1719

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

1720

ret = fchown(pubkey_fd, uid, gid);

1721

if(ret == -1){

1722

perror_plus("fchown");

1723

}

1724

}

1725

}

1726

TEMP_FAILURE_RETRY(close(pubkey_fd));

1727

}

1728

}

1729

1730

/* Lower privileges */

1731

errno = 0;

1732

ret = seteuid(uid);

1733

if(ret == -1){

1734

perror_plus("seteuid");

1735

}

1736

}

1737

1738

/* Run network hooks */

1739

{

1740

if(getuid() == 0){

1741

/* Re-raise priviliges */

1742

errno = 0;

1743

ret = seteuid(0);

1744

if(ret == -1){

1745

perror_plus("seteuid");

1746

}

1747

}

1748

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

1749

goto end;

1750

}

1751

if(getuid() == 0){

1752

/* Lower privileges */

1753

errno = 0;

1754

ret = seteuid(uid);

1755

if(ret == -1){

1756

perror_plus("seteuid");

1757

}

1012

1758

}

1013

1759

}

1014

1760

1016

1762

avahi_set_log_function(empty_log);

1017

1763

}

1018

1764

1765

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

1766

struct dirent **direntries;

1767

/* First look for interfaces that are up */

1768

ret = scandir(sys_class_net, &direntries, up_interface,

1769

alphasort);

1770

if(ret == 0){

1771

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

1772

free(direntries);

1773

ret = scandir(sys_class_net, &direntries, good_interface,

1774

alphasort);

1775

}

1776

if(ret >= 1){

1777

/* Pick the first interface returned */

1778

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

1779

if(debug){

1780

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

1781

}

1782

if(interface == NULL){

1783

perror_plus("malloc");

1784

free(direntries);

1785

exitcode = EXIT_FAILURE;

1786

goto end;

1787

}

1788

free(direntries);

1789

} else {

1790

free(direntries);

1791

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

1792

exitcode = EXIT_FAILURE;

1793

goto end;

1794

}

1795

}

1796

1019

1797

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

1020

1798

from the signal handler */

1021

1799

/* Initialize the pseudo-RNG for Avahi */

1022

1800

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

1023

1801

mc.simple_poll = avahi_simple_poll_new();

1024

1802

if(mc.simple_poll == NULL){

1025

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

1026

exitcode = EXIT_FAILURE;

1803

fprintf_plus(stderr,

1804

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

1805

exitcode = EX_UNAVAILABLE;

1027

1806

goto end;

1028

1807

}

1029

1808

1030

1809

sigemptyset(&sigterm_action.sa_mask);

1031

1810

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

1032

1811

if(ret == -1){

1033

perror("sigaddset");

1034

exitcode = EXIT_FAILURE;

1812

perror_plus("sigaddset");

1813

exitcode = EX_OSERR;

1035

1814

goto end;

1036

1815

}

1037

1816

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

1038

1817

if(ret == -1){

1039

perror("sigaddset");

1040

exitcode = EXIT_FAILURE;

1818

perror_plus("sigaddset");

1819

exitcode = EX_OSERR;

1041

1820

goto end;

1042

1821

}

1043

1822

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

1044

1823

if(ret == -1){

1045

perror("sigaddset");

1046

exitcode = EXIT_FAILURE;

1047

goto end;

1048

}

1049

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

1050

if(ret == -1){

1051

perror("sigaction");

1052

exitcode = EXIT_FAILURE;

1053

goto end;

1054

}

1824

perror_plus("sigaddset");

1825

exitcode = EX_OSERR;

1826

goto end;

1827

}

1828

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

1829

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

1830

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

1831

*/

1832

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

1833

if(ret == -1){

1834

perror_plus("sigaction");

1835

return EX_OSERR;

1836

}

1837

if(old_sigterm_action.sa_handler != SIG_IGN){

1838

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

1839

if(ret == -1){

1840

perror_plus("sigaction");

1841

exitcode = EX_OSERR;

1842

goto end;

1843

}

1844

}

1845

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

1846

if(ret == -1){

1847

perror_plus("sigaction");

1848

return EX_OSERR;

1849

}

1850

if(old_sigterm_action.sa_handler != SIG_IGN){

1851

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

1852

if(ret == -1){

1853

perror_plus("sigaction");

1854

exitcode = EX_OSERR;

1855

goto end;

1856

}

1857

}

1858

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

1859

if(ret == -1){

1860

perror_plus("sigaction");

1861

return EX_OSERR;

1862

}

1863

if(old_sigterm_action.sa_handler != SIG_IGN){

1864

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

1865

if(ret == -1){

1866

perror_plus("sigaction");

1867

exitcode = EX_OSERR;

1868

goto end;

1869

}

1870

}

1055

1871

1056

1872

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

1057

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

1873

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

1874

if_index = (AvahiIfIndex) if_nametoindex(interface);

1875

if(if_index == 0){

1876

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

1877

exitcode = EX_UNAVAILABLE;

1878

goto end;

1879

}

1880

1881

if(quit_now){

1882

goto end;

1883

}

1884

1885

/* Re-raise priviliges */

1886

errno = 0;

1887

ret = seteuid(0);

1888

if(ret == -1){

1889

perror_plus("seteuid");

1890

}

1891

1058

1892

#ifdef __linux__

1059

1893

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1060

messages to mess up the prompt */

1894

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

1061

1895

ret = klogctl(8, NULL, 5);

1062

1896

bool restore_loglevel = true;

1063

1897

if(ret == -1){

1064

1898

restore_loglevel = false;

1065

perror("klogctl");

1899

perror_plus("klogctl");

1066

1900

}

1067

1901

#endif /* __linux__ */

1068

1902

1069

1903

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1070

1904

if(sd < 0){

1071

perror("socket");

1072

exitcode = EXIT_FAILURE;

1905

perror_plus("socket");

1906

exitcode = EX_OSERR;

1073

1907

#ifdef __linux__

1074

1908

if(restore_loglevel){

1075

1909

ret = klogctl(7, NULL, 0);

1076

1910

if(ret == -1){

1077

perror("klogctl");

1911

perror_plus("klogctl");

1078

1912

}

1079

1913

}

1080

1914

#endif /* __linux__ */

1915

/* Lower privileges */

1916

errno = 0;

1917

ret = seteuid(uid);

1918

if(ret == -1){

1919

perror_plus("seteuid");

1920

}

1081

1921

goto end;

1082

1922

}

1083

1923

strcpy(network.ifr_name, interface);

1084

1924

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

1085

1925

if(ret == -1){

1086

perror("ioctl SIOCGIFFLAGS");

1926

perror_plus("ioctl SIOCGIFFLAGS");

1087

1927

#ifdef __linux__

1088

1928

if(restore_loglevel){

1089

1929

ret = klogctl(7, NULL, 0);

1090

1930

if(ret == -1){

1091

perror("klogctl");

1931

perror_plus("klogctl");

1092

1932

}

1093

1933

}

1094

1934

#endif /* __linux__ */

1095

exitcode = EXIT_FAILURE;

1935

exitcode = EX_OSERR;

1936

/* Lower privileges */

1937

errno = 0;

1938

ret = seteuid(uid);

1939

if(ret == -1){

1940

perror_plus("seteuid");

1941

}

1096

1942

goto end;

1097

1943

}

1098

1944

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

1099

1945

network.ifr_flags |= IFF_UP;

1946

take_down_interface = true;

1100

1947

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

1101

1948

if(ret == -1){

1102

perror("ioctl SIOCSIFFLAGS");

1103

exitcode = EXIT_FAILURE;

1949

take_down_interface = false;

1950

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1951

exitcode = EX_OSERR;

1104

1952

#ifdef __linux__

1105

1953

if(restore_loglevel){

1106

1954

ret = klogctl(7, NULL, 0);

1107

1955

if(ret == -1){

1108

perror("klogctl");

1956

perror_plus("klogctl");

1109

1957

}

1110

1958

}

1111

1959

#endif /* __linux__ */

1960

/* Lower privileges */

1961

errno = 0;

1962

ret = seteuid(uid);

1963

if(ret == -1){

1964

perror_plus("seteuid");

1965

}

1112

1966

goto end;

1113

1967

}

1114

1968

}

1115

/* sleep checking until interface is running */

1969

/* Sleep checking until interface is running.

1970

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

1116

1971

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

1117

1972

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

1118

1973

if(ret == -1){

1119

perror("ioctl SIOCGIFFLAGS");

1974

perror_plus("ioctl SIOCGIFFLAGS");

1120

1975

} else if(network.ifr_flags & IFF_RUNNING){

1121

1976

break;

1122

1977

}

1123

1978

struct timespec sleeptime = { .tv_nsec = 250000000 };

1124

1979

ret = nanosleep(&sleeptime, NULL);

1125

1980

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

1126

perror("nanosleep");

1981

perror_plus("nanosleep");

1127

1982

}

1128

1983

}

1129

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

1130

if(ret == -1){

1131

perror("close");

1984

if(not take_down_interface){

1985

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

1986

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

1987

if(ret == -1){

1988

perror_plus("close");

1989

}

1132

1990

}

1133

1991

#ifdef __linux__

1134

1992

if(restore_loglevel){

1135

1993

/* Restores kernel loglevel to default */

1136

1994

ret = klogctl(7, NULL, 0);

1137

1995

if(ret == -1){

1138

perror("klogctl");

1996

perror_plus("klogctl");

1139

1997

}

1140

1998

}

1141

1999

#endif /* __linux__ */

1142

}

1143

1144

uid = getuid();

1145

gid = getgid();

1146

1147

errno = 0;

1148

setgid(gid);

1149

if(ret == -1){

1150

perror("setgid");

1151

}

1152

1153

ret = setuid(uid);

1154

if(ret == -1){

1155

perror("setuid");

2000

/* Lower privileges */

2001

errno = 0;

2002

/* Lower privileges */

2003

ret = seteuid(uid);

2004

if(ret == -1){

2005

perror_plus("seteuid");

2006

}

2007

}

2008

2009

if(quit_now){

2010

goto end;

1156

2011

}

1157

2012

1158

2013

ret = init_gnutls_global(pubkey, seckey);

1159

2014

if(ret == -1){

1160

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

1161

exitcode = EXIT_FAILURE;

2015

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

2016

exitcode = EX_UNAVAILABLE;

1162

2017

goto end;

1163

2018

} else {

1164

2019

gnutls_initialized = true;

1165

2020

}

1166

2021

2022

if(quit_now){

2023

goto end;

2024

}

2025

1167

2026

if(mkdtemp(tempdir) == NULL){

1168

perror("mkdtemp");

2027

perror_plus("mkdtemp");

1169

2028

goto end;

1170

2029

}

1171

2030

tempdir_created = true;

1172

2031

2032

if(quit_now){

2033

goto end;

2034

}

2035

1173

2036

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

1174

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

1175

exitcode = EXIT_FAILURE;

2037

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

2038

exitcode = EX_UNAVAILABLE;

1176

2039

goto end;

1177

2040

} else {

1178

2041

gpgme_initialized = true;

1179

2042

}

1180

2043

1181

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

1182

if_index = (AvahiIfIndex) if_nametoindex(interface);

1183

if(if_index == 0){

1184

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

1185

exitcode = EXIT_FAILURE;

1186

goto end;

1187

}

2044

if(quit_now){

2045

goto end;

1188

2046

}

1189

2047

1190

2048

if(connect_to != NULL){

1192

2050

/* (Mainly meant for debugging) */

1193

2051

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

1194

2052

if(address == NULL){

1195

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

1196

exitcode = EXIT_FAILURE;

1197

goto end;

1198

}

2053

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

2054

exitcode = EX_USAGE;

2055

goto end;

2056

}

2057

2058

if(quit_now){

2059

goto end;

2060

}

2061

1199

2062

uint16_t port;

1200

2063

errno = 0;

1201

2064

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

1202

2065

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

1203

2066

or tmpmax != (uint16_t)tmpmax){

1204

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

1205

exitcode = EXIT_FAILURE;

1206

goto end;

1207

}

2067

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

2068

exitcode = EX_USAGE;

2069

goto end;

2070

}

2071

2072

if(quit_now){

2073

goto end;

2074

}

2075

1208

2076

port = (uint16_t)tmpmax;

1209

2077

*address = '\0';

1210

address = connect_to;

1211

2078

/* Colon in address indicates IPv6 */

1212

2079

int af;

1213

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

2080

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

1214

2081

af = AF_INET6;

2082

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

2083

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

2084

{

2085

connect_to++;

2086

address[-1] = '\0';

2087

}

1215

2088

} else {

1216

2089

af = AF_INET;

1217

2090

}

1218

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

1219

if(ret < 0){

1220

exitcode = EXIT_FAILURE;

1221

} else {

2091

address = connect_to;

2092

2093

if(quit_now){

2094

goto end;

2095

}

2096

2097

while(not quit_now){

2098

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

2099

if(quit_now or ret == 0){

2100

break;

2101

}

2102

if(debug){

2103

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

2104

(int)retry_interval);

2105

}

2106

sleep((int)retry_interval);

2107

}

2108

2109

if (not quit_now){

1222

2110

exitcode = EXIT_SUCCESS;

1223

2111

}

1224

goto end;

1225

}

1226

2112

2113

goto end;

2114

}

2115

2116

if(quit_now){

2117

goto end;

2118

}

2119

1227

2120

{

1228

2121

AvahiServerConfig config;

1229

2122

/* Do not publish any local Zeroconf records */

1244

2137

1245

2138

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

1246

2139

if(mc.server == NULL){

1247

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

1248

avahi_strerror(error));

1249

exitcode = EXIT_FAILURE;

2140

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

2141

avahi_strerror(error));

2142

exitcode = EX_UNAVAILABLE;

2143

goto end;

2144

}

2145

2146

if(quit_now){

1250

2147

goto end;

1251

2148

}

1252

2149

1255

2152

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1256

2153

NULL, 0, browse_callback, NULL);

1257

2154

if(sb == NULL){

1258

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

1259

avahi_strerror(avahi_server_errno(mc.server)));

1260

exitcode = EXIT_FAILURE;

2155

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

2156

avahi_strerror(avahi_server_errno(mc.server)));

2157

exitcode = EX_UNAVAILABLE;

2158

goto end;

2159

}

2160

2161

if(quit_now){

1261

2162

goto end;

1262

2163

}

1263

2164

1264

2165

/* Run the main loop */

1265

2166

1266

2167

if(debug){

1267

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

1268

}

1269

1270

avahi_simple_poll_loop(mc.simple_poll);

2168

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

2169

}

2170

2171

ret = avahi_loop_with_timeout(mc.simple_poll,

2172

(int)(retry_interval * 1000));

2173

if(debug){

2174

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

2175

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

2176

}

1271

2177

1272

2178

end:

1273

2179

1274

2180

if(debug){

1275

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

2181

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

1276

2182

}

1277

2183

1278

2184

/* Cleanup things */

1294

2200

if(gpgme_initialized){

1295

2201

gpgme_release(mc.ctx);

1296

2202

}

1297

1298

/* Removes the temp directory used by GPGME */

2203

2204

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

2205

has seen */

2206

if(mc.current_server != NULL){

2207

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

2208

while(mc.current_server != NULL){

2209

server *next = mc.current_server->next;

2210

free(mc.current_server);

2211

mc.current_server = next;

2212

}

2213

}

2214

2215

/* Re-raise priviliges */

2216

{

2217

if(getuid() == 0){

2218

errno = 0;

2219

ret = seteuid(0);

2220

if(ret == -1){

2221

perror_plus("seteuid");

2222

}

2223

}

2224

/* Run network hooks */

2225

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

2226

goto end;

2227

}

2228

2229

/* Take down the network interface */

2230

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

2231

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

2232

if(ret == -1){

2233

perror_plus("ioctl SIOCGIFFLAGS");

2234

} else if(network.ifr_flags & IFF_UP){

2235

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

2236

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

2237

if(ret == -1){

2238

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2239

}

2240

}

2241

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

2242

if(ret == -1){

2243

perror_plus("close");

2244

}

2245

}

2246

}

2247

if(getuid() == 0){

2248

/* Lower privileges permanently */

2249

errno = 0;

2250

ret = setuid(uid);

2251

if(ret == -1){

2252

perror_plus("setuid");

2253

}

2254

}

2255

2256

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

1299

2257

if(tempdir_created){

1300

DIR *d;

1301

struct dirent *direntry;

1302

d = opendir(tempdir);

1303

if(d == NULL){

1304

if(errno != ENOENT){

1305

perror("opendir");

1306

}

1307

} else {

1308

while(true){

1309

direntry = readdir(d);

1310

if(direntry == NULL){

1311

break;

1312

}

1313

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

1314

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

1315

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

1316

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

1317

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

1318

continue;

1319

}

2258

struct dirent **direntries = NULL;

2259

struct dirent *direntry = NULL;

2260

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

2261

alphasort);

2262

if (numentries > 0){

2263

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

2264

direntry = direntries[i];

1320

2265

char *fullname = NULL;

1321

2266

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

1322

2267

direntry->d_name);

1323

2268

if(ret < 0){

1324

perror("asprintf");

2269

perror_plus("asprintf");

1325

2270

continue;

1326

2271

}

1327

2272

ret = remove(fullname);

1328

2273

if(ret == -1){

1329

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

1330

strerror(errno));

2274

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

2275

strerror(errno));

1331

2276

}

1332

2277

free(fullname);

1333

2278

}

1334

closedir(d);

2279

}

2280

2281

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

2282

free(direntries);

2283

if (numentries == -1){

2284

perror_plus("scandir");

1335

2285

}

1336

2286

ret = rmdir(tempdir);

1337

2287

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

1338

perror("rmdir");

1339

}

2288

perror_plus("rmdir");

2289

}

2290

}

2291

2292

if(quit_now){

2293

sigemptyset(&old_sigterm_action.sa_mask);

2294

old_sigterm_action.sa_handler = SIG_DFL;

2295

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

2296

&old_sigterm_action,

2297

NULL));

2298

if(ret == -1){

2299

perror_plus("sigaction");

2300

}

2301

do {

2302

ret = raise(signal_received);

2303

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

2304

if(ret != 0){

2305

perror_plus("raise");

2306

abort();

2307

}

2308

TEMP_FAILURE_RETRY(pause());

1340

2309

}

1341

2310

1342

2311

return exitcode;