/mandos/release : revision 237.22.3

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

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sigaction(), SIGTERM, sig_atomic_t,

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raise() */

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

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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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

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WEXITSTATUS(), WTERMSIG() */

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

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#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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116

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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"

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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>";

134

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 */

142

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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162

} 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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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: ",

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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)))

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

184

va_list ap;

185

va_start (ap, format);

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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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/*

146

193

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

148

195

* "buffer_length" is how much is already used.

149

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;

160

207

}

161

208

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/* 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,

220

.if_index = if_index,

221

.af = af };

222

if(new_server->ip == NULL){

223

perror_plus("strdup");

224

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;

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new_server->prev->next = new_server;

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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;

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}

245

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/*

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247

* Initialize GPGME.

164

248

*/

165

static bool init_gpgme(const char *seckey,

166

const char *pubkey, const char *tempdir){

249

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

250

const char *tempdir){

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251

gpgme_error_t rc;

168

252

gpgme_engine_info_t engine_info;

169

253

178

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179

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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

}

184

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",

272

gpgme_strsource(rc), gpgme_strerror(rc));

189

273

return false;

190

274

}

191

275

192

276

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));

278

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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282

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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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287

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");

292

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",

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gpgme_strsource(rc), gpgme_strerror(rc));

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301

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 */

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

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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

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

399

while(recipient != NULL){

313

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

314

gpgme_pubkey_algo_name(recipient->pubkey_algo));

315

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

316

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

317

recipient->status == GPG_ERR_NO_SECKEY

318

? "No" : "Yes");

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");

319

407

recipient = recipient->next;

320

408

}

321

409

}

324

412

}

325

413

326

414

if(debug){

327

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

415

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

328

416

}

329

417

330

418

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

331

419

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

332

perror("gpgme_data_seek");

420

perror_plus("gpgme_data_seek");

333

421

plaintext_length = -1;

334

422

goto decrypt_end;

335

423

}

337

425

*plaintext = NULL;

338

426

while(true){

339

427

plaintext_capacity = incbuffer(plaintext,

340

(size_t)plaintext_length,

341

plaintext_capacity);

428

(size_t)plaintext_length,

429

plaintext_capacity);

342

430

if(plaintext_capacity == 0){

343

perror("incbuffer");

344

plaintext_length = -1;

345

goto decrypt_end;

431

perror_plus("incbuffer");

432

plaintext_length = -1;

433

goto decrypt_end;

346

434

}

347

435

348

436

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

353

441

break;

354

442

}

355

443

if(ret < 0){

356

perror("gpgme_data_read");

444

perror_plus("gpgme_data_read");

357

445

plaintext_length = -1;

358

446

goto decrypt_end;

359

447

}

361

449

}

362

450

363

451

if(debug){

364

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

452

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

365

453

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

366

454

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

367

455

}

389

477

/* GnuTLS log function callback */

390

478

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

391

479

const char* string){

392

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

480

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

393

481

}

394

482

395

483

static int init_gnutls_global(const char *pubkeyfilename,

397

485

int ret;

398

486

399

487

if(debug){

400

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

488

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

401

489

}

402

490

403

491

ret = gnutls_global_init();

404

492

if(ret != GNUTLS_E_SUCCESS){

405

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

406

safer_gnutls_strerror(ret));

493

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

494

safer_gnutls_strerror(ret));

407

495

return -1;

408

496

}

409

497

416

504

}

417

505

418

506

/* OpenPGP credentials */

419

gnutls_certificate_allocate_credentials(&mc.cred);

507

ret = gnutls_certificate_allocate_credentials(&mc.cred);

420

508

if(ret != GNUTLS_E_SUCCESS){

421

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

422

from

423

-Wunreachable-code

424

*/

425

safer_gnutls_strerror(ret));

509

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

510

safer_gnutls_strerror(ret));

426

511

gnutls_global_deinit();

427

512

return -1;

428

513

}

429

514

430

515

if(debug){

431

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

432

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

433

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);

434

520

}

435

521

436

522

ret = gnutls_certificate_set_openpgp_key_file

437

523

(mc.cred, pubkeyfilename, seckeyfilename,

438

524

GNUTLS_OPENPGP_FMT_BASE64);

439

525

if(ret != GNUTLS_E_SUCCESS){

440

fprintf(stderr,

441

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

442

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

443

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

444

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));

445

531

goto globalfail;

446

532

}

447

533

448

534

/* GnuTLS server initialization */

449

535

ret = gnutls_dh_params_init(&mc.dh_params);

450

536

if(ret != GNUTLS_E_SUCCESS){

451

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

452

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

537

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

538

" initialization: %s\n",

539

safer_gnutls_strerror(ret));

453

540

goto globalfail;

454

541

}

455

542

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

456

543

if(ret != GNUTLS_E_SUCCESS){

457

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

458

safer_gnutls_strerror(ret));

544

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

545

safer_gnutls_strerror(ret));

459

546

goto globalfail;

460

547

}

461

548

474

561

static int init_gnutls_session(gnutls_session_t *session){

475

562

int ret;

476

563

/* GnuTLS session creation */

477

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);

478

570

if(ret != GNUTLS_E_SUCCESS){

479

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

480

safer_gnutls_strerror(ret));

571

fprintf_plus(stderr,

572

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

573

safer_gnutls_strerror(ret));

481

574

}

482

575

483

576

{

484

577

const char *err;

485

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);

486

585

if(ret != GNUTLS_E_SUCCESS){

487

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

488

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

489

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));

490

589

gnutls_deinit(*session);

491

590

return -1;

492

591

}

493

592

}

494

593

495

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

496

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);

497

602

if(ret != GNUTLS_E_SUCCESS){

498

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

499

safer_gnutls_strerror(ret));

603

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

604

safer_gnutls_strerror(ret));

500

605

gnutls_deinit(*session);

501

606

return -1;

502

607

}

503

608

504

609

/* ignore client certificate if any. */

505

gnutls_certificate_server_set_request(*session,

506

GNUTLS_CERT_IGNORE);

610

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

507

611

508

612

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

509

613

514

618

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

515

619

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

516

620

517

sig_atomic_t quit_now = 0;

518

int signal_received = 0;

519

520

621

/* Called when a Mandos server is found */

521

622

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

522

623

AvahiIfIndex if_index,

528

629

struct sockaddr_in6 in6;

529

630

} to;

530

631

char *buffer = NULL;

531

char *decrypted_buffer;

632

char *decrypted_buffer = NULL;

532

633

size_t buffer_length = 0;

533

634

size_t buffer_capacity = 0;

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

539

642

if(quit_now){

643

errno = EINTR;

540

644

return -1;

541

645

}

542

646

548

652

pf = PF_INET;

549

653

break;

550

654

default:

551

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

655

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

656

errno = EINVAL;

552

657

return -1;

553

658

}

554

659

558

663

}

559

664

560

665

if(debug){

561

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

562

"\n", ip, port);

666

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

667

PRIu16 "\n", ip, port);

563

668

}

564

669

565

670

tcp_sd = socket(pf, SOCK_STREAM, 0);

566

671

if(tcp_sd < 0){

567

perror("socket");

568

retval = -1;

672

int e = errno;

673

perror_plus("socket");

674

errno = e;

569

675

goto mandos_end;

570

676

}

571

677

572

678

if(quit_now){

679

errno = EINTR;

573

680

goto mandos_end;

574

681

}

575

682

582

689

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

583

690

}

584

691

if(ret < 0 ){

585

perror("inet_pton");

586

retval = -1;

692

int e = errno;

693

perror_plus("inet_pton");

694

errno = e;

587

695

goto mandos_end;

588

696

}

589

697

if(ret == 0){

590

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

591

retval = -1;

698

int e = errno;

699

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

700

errno = e;

592

701

goto mandos_end;

593

702

}

594

703

if(af == AF_INET6){

598

707

599

708

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

600

709

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

601

-Wunreachable-code*/

710

-Wunreachable-code*/

602

711

if(if_index == AVAHI_IF_UNSPEC){

603

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

604

" without a network interface\n");

605

retval = -1;

712

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

713

" incomplete without a network interface\n");

714

errno = EINVAL;

606

715

goto mandos_end;

607

716

}

608

717

/* Set the network interface number as scope */

615

724

}

616

725

617

726

if(quit_now){

727

errno = EINTR;

618

728

goto mandos_end;

619

729

}

620

730

622

732

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

623

733

char interface[IF_NAMESIZE];

624

734

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

625

perror("if_indextoname");

735

perror_plus("if_indextoname");

626

736

} else {

627

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

628

ip, interface, port);

737

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

738

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

629

739

}

630

740

} else {

631

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

632

port);

741

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

742

ip, port);

633

743

}

634

744

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

635

745

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

642

752

sizeof(addrstr));

643

753

}

644

754

if(pcret == NULL){

645

perror("inet_ntop");

755

perror_plus("inet_ntop");

646

756

} else {

647

757

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

648

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

758

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

649

759

}

650

760

}

651

761

}

652

762

653

763

if(quit_now){

764

errno = EINTR;

654

765

goto mandos_end;

655

766

}

656

767

660

771

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

661

772

}

662

773

if(ret < 0){

663

perror("connect");

664

retval = -1;

774

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

775

int e = errno;

776

perror_plus("connect");

777

errno = e;

778

}

665

779

goto mandos_end;

666

780

}

667

781

668

782

if(quit_now){

783

errno = EINTR;

669

784

goto mandos_end;

670

785

}

671

786

674

789

while(true){

675

790

size_t out_size = strlen(out);

676

791

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

677

out_size - written));

792

out_size - written));

678

793

if(ret == -1){

679

perror("write");

680

retval = -1;

794

int e = errno;

795

perror_plus("write");

796

errno = e;

681

797

goto mandos_end;

682

798

}

683

799

written += (size_t)ret;

693

809

}

694

810

695

811

if(quit_now){

812

errno = EINTR;

696

813

goto mandos_end;

697

814

}

698

815

}

699

816

700

817

if(debug){

701

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

818

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

702

819

}

703

820

704

821

if(quit_now){

822

errno = EINTR;

705

823

goto mandos_end;

706

824

}

707

825

708

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

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);

709

831

710

832

if(quit_now){

833

errno = EINTR;

711

834

goto mandos_end;

712

835

}

713

836

714

837

do {

715

838

ret = gnutls_handshake(session);

716

839

if(quit_now){

840

errno = EINTR;

717

841

goto mandos_end;

718

842

}

719

843

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

720

844

721

845

if(ret != GNUTLS_E_SUCCESS){

722

846

if(debug){

723

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

847

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

724

848

gnutls_perror(ret);

725

849

}

726

retval = -1;

850

errno = EPROTO;

727

851

goto mandos_end;

728

852

}

729

853

730

854

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

731

855

732

856

if(debug){

733

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

734

ip);

857

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

858

" %s\n", ip);

735

859

}

736

860

737

861

while(true){

738

862

739

863

if(quit_now){

864

errno = EINTR;

740

865

goto mandos_end;

741

866

}

742

867

743

868

buffer_capacity = incbuffer(&buffer, buffer_length,

744

buffer_capacity);

869

buffer_capacity);

745

870

if(buffer_capacity == 0){

746

perror("incbuffer");

747

retval = -1;

871

int e = errno;

872

perror_plus("incbuffer");

873

errno = e;

748

874

goto mandos_end;

749

875

}

750

876

751

877

if(quit_now){

878

errno = EINTR;

752

879

goto mandos_end;

753

880

}

754

881

767

894

ret = gnutls_handshake(session);

768

895

769

896

if(quit_now){

897

errno = EINTR;

770

898

goto mandos_end;

771

899

}

772

900

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

773

901

if(ret < 0){

774

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

902

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

903

"***\n");

775

904

gnutls_perror(ret);

776

retval = -1;

905

errno = EPROTO;

777

906

goto mandos_end;

778

907

}

779

908

break;

780

909

default:

781

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

782

" encrypted session with Mandos server\n");

783

retval = -1;

910

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

911

" encrypted session with Mandos server\n");

784

912

gnutls_bye(session, GNUTLS_SHUT_RDWR);

913

errno = EIO;

785

914

goto mandos_end;

786

915

}

787

916

} else {

790

919

}

791

920

792

921

if(debug){

793

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

794

}

795

796

if(quit_now){

797

goto mandos_end;

798

}

799

800

gnutls_bye(session, GNUTLS_SHUT_RDWR);

801

802

if(quit_now){

803

goto mandos_end;

804

}

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);

805

937

806

938

if(buffer_length > 0){

807

939

ssize_t decrypted_buffer_size;

808

decrypted_buffer_size = pgp_packet_decrypt(buffer,

809

buffer_length,

940

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

810

941

&decrypted_buffer);

811

942

if(decrypted_buffer_size >= 0){

812

943

813

944

written = 0;

814

945

while(written < (size_t) decrypted_buffer_size){

815

946

if(quit_now){

947

errno = EINTR;

816

948

goto mandos_end;

817

949

}

818

950

820

952

(size_t)decrypted_buffer_size - written,

821

953

stdout);

822

954

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

955

int e = errno;

823

956

if(debug){

824

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

825

strerror(errno));

957

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

958

strerror(errno));

826

959

}

827

retval = -1;

828

break;

960

errno = e;

961

goto mandos_end;

829

962

}

830

963

written += (size_t)ret;

831

964

}

832

free(decrypted_buffer);

833

} else {

834

retval = -1;

965

retval = 0;

835

966

}

836

} else {

837

retval = -1;

838

967

}

839

968

840

969

/* Shutdown procedure */

841

970

842

971

mandos_end:

843

free(buffer);

844

if(tcp_sd >= 0){

845

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

846

}

847

if(ret == -1){

848

perror("close");

849

}

850

gnutls_deinit(session);

851

if(quit_now){

852

retval = -1;

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

}

853

991

}

854

992

return retval;

855

993

}

880

1018

switch(event){

881

1019

default:

882

1020

case AVAHI_RESOLVER_FAILURE:

883

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

884

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

885

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)));

886

1025

break;

887

1026

888

1027

case AVAHI_RESOLVER_FOUND:

890

1029

char ip[AVAHI_ADDRESS_STR_MAX];

891

1030

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

892

1031

if(debug){

893

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

894

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

895

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);

896

1035

}

897

1036

int ret = start_mandos_communication(ip, port, interface,

898

1037

avahi_proto_to_af(proto));

899

1038

if(ret == 0){

900

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

}

901

1046

}

902

1047

}

903

1048

}

927

1072

default:

928

1073

case AVAHI_BROWSER_FAILURE:

929

1074

930

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

931

avahi_strerror(avahi_server_errno(mc.server)));

1075

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

1076

avahi_strerror(avahi_server_errno(mc.server)));

932

1077

avahi_simple_poll_quit(mc.simple_poll);

933

1078

return;

934

1079

941

1086

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

942

1087

name, type, domain, protocol, 0,

943

1088

resolve_callback, NULL) == NULL)

944

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

945

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)));

946

1092

break;

947

1093

948

1094

case AVAHI_BROWSER_REMOVE:

951

1097

case AVAHI_BROWSER_ALL_FOR_NOW:

952

1098

case AVAHI_BROWSER_CACHE_EXHAUSTED:

953

1099

if(debug){

954

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

1100

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

1101

" searching...\n");

955

1102

}

956

1103

break;

957

1104

}

958

1105

}

959

1106

960

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

1107

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

961

1108

static void handle_sigterm(int sig){

962

1109

if(quit_now){

963

1110

return;

965

1112

quit_now = 1;

966

1113

signal_received = sig;

967

1114

int old_errno = errno;

1115

/* set main loop to exit */

968

1116

if(mc.simple_poll != NULL){

969

1117

avahi_simple_poll_quit(mc.simple_poll);

970

1118

}

971

1119

errno = old_errno;

972

1120

}

973

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

error_t raise_privileges(void){

1397

error_t old_errno = errno;

1398

error_t ret_errno = 0;

1399

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

1400

ret_errno = errno;

1401

perror_plus("seteuid");

1402

}

1403

errno = old_errno;

1404

return ret_errno;

1405

}

1406

1407

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

1408

error_t raise_privileges_permanently(void){

1409

error_t old_errno = errno;

1410

error_t ret_errno = raise_privileges();

1411

if(ret_errno != 0){

1412

errno = old_errno;

1413

return ret_errno;

1414

}

1415

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

1416

ret_errno = errno;

1417

perror_plus("seteuid");

1418

}

1419

errno = old_errno;

1420

return ret_errno;

1421

}

1422

1423

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

1424

error_t lower_privileges(void){

1425

error_t old_errno = errno;

1426

error_t ret_errno = 0;

1427

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

1428

ret_errno = errno;

1429

perror_plus("seteuid");

1430

}

1431

errno = old_errno;

1432

return ret_errno;

1433

}

1434

1435

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

1436

const float delay){

1437

struct dirent **direntries;

1438

struct dirent *direntry;

1439

int ret;

1440

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

1441

alphasort);

1442

if(numhooks == -1){

1443

perror_plus("scandir");

1444

} else {

1445

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

1446

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

1447

direntry = direntries[i];

1448

char *fullname = NULL;

1449

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

1450

if(ret < 0){

1451

perror_plus("asprintf");

1452

continue;

1453

}

1454

if(debug){

1455

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

1456

direntry->d_name);

1457

}

1458

pid_t hook_pid = fork();

1459

if(hook_pid == 0){

1460

/* Child */

1461

/* Raise privileges */

1462

raise_privileges_permanently();

1463

/* Set group */

1464

errno = 0;

1465

ret = setgid(0);

1466

if(ret == -1){

1467

perror_plus("setgid");

1468

}

1469

/* Reset supplementary groups */

1470

errno = 0;

1471

ret = setgroups(0, NULL);

1472

if(ret == -1){

1473

perror_plus("setgroups");

1474

}

1475

dup2(devnull, STDIN_FILENO);

1476

close(devnull);

1477

dup2(STDERR_FILENO, STDOUT_FILENO);

1478

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

1479

if(ret == -1){

1480

perror_plus("setenv");

1481

_exit(EX_OSERR);

1482

}

1483

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

1484

if(ret == -1){

1485

perror_plus("setenv");

1486

_exit(EX_OSERR);

1487

}

1488

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

1489

if(ret == -1){

1490

perror_plus("setenv");

1491

_exit(EX_OSERR);

1492

}

1493

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

1494

if(ret == -1){

1495

perror_plus("setenv");

1496

_exit(EX_OSERR);

1497

}

1498

char *delaystring;

1499

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

1500

if(ret == -1){

1501

perror_plus("asprintf");

1502

_exit(EX_OSERR);

1503

}

1504

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

1505

if(ret == -1){

1506

free(delaystring);

1507

perror_plus("setenv");

1508

_exit(EX_OSERR);

1509

}

1510

free(delaystring);

1511

if(connect_to != NULL){

1512

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

1513

if(ret == -1){

1514

perror_plus("setenv");

1515

_exit(EX_OSERR);

1516

}

1517

}

1518

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

1519

perror_plus("execl");

1520

_exit(EXIT_FAILURE);

1521

}

1522

} else {

1523

int status;

1524

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

1525

perror_plus("waitpid");

1526

free(fullname);

1527

continue;

1528

}

1529

if(WIFEXITED(status)){

1530

if(WEXITSTATUS(status) != 0){

1531

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

1532

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

1533

WEXITSTATUS(status));

1534

free(fullname);

1535

continue;

1536

}

1537

} else if(WIFSIGNALED(status)){

1538

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

1539

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

1540

WTERMSIG(status));

1541

free(fullname);

1542

continue;

1543

} else {

1544

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

1545

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

1546

free(fullname);

1547

continue;

1548

}

1549

}

1550

free(fullname);

1551

if(debug){

1552

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

1553

direntry->d_name);

1554

}

1555

}

1556

close(devnull);

1557

}

1558

return true;

1559

}

1560

1561

int bring_up_interface(const char *const interface,

1562

const float delay){

1563

int sd = -1;

1564

int old_errno = errno;

1565

int ret_errno = 0;

1566

int ret;

1567

struct ifreq network;

1568

AvahiIfIndex if_index = (AvahiIfIndex)if_nametoindex(interface);

1569

if(if_index == 0){

1570

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

1571

errno = old_errno;

1572

return ENXIO;

1573

}

1574

1575

if(quit_now){

1576

errno = old_errno;

1577

return EINTR;

1578

}

1579

1580

/* Re-raise priviliges */

1581

raise_privileges();

1582

1583

#ifdef __linux__

1584

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1585

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

1586

ret = klogctl(8, NULL, 5);

1587

bool restore_loglevel = true;

1588

if(ret == -1){

1589

restore_loglevel = false;

1590

perror_plus("klogctl");

1591

}

1592

#endif /* __linux__ */

1593

1594

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1595

if(sd < 0){

1596

ret_errno = errno;

1597

perror_plus("socket");

1598

#ifdef __linux__

1599

if(restore_loglevel){

1600

ret = klogctl(7, NULL, 0);

1601

if(ret == -1){

1602

perror_plus("klogctl");

1603

}

1604

}

1605

#endif /* __linux__ */

1606

/* Lower privileges */

1607

lower_privileges();

1608

errno = old_errno;

1609

return ret_errno;

1610

}

1611

strcpy(network.ifr_name, interface);

1612

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

1613

if(ret == -1){

1614

ret_errno = errno;

1615

perror_plus("ioctl SIOCGIFFLAGS");

1616

#ifdef __linux__

1617

if(restore_loglevel){

1618

ret = klogctl(7, NULL, 0);

1619

if(ret == -1){

1620

perror_plus("klogctl");

1621

}

1622

}

1623

#endif /* __linux__ */

1624

/* Lower privileges */

1625

lower_privileges();

1626

errno = old_errno;

1627

return ret_errno;

1628

}

1629

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

1630

network.ifr_flags |= IFF_UP;

1631

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

1632

if(ret == -1){

1633

ret_errno = errno;

1634

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1635

#ifdef __linux__

1636

if(restore_loglevel){

1637

ret = klogctl(7, NULL, 0);

1638

if(ret == -1){

1639

perror_plus("klogctl");

1640

}

1641

}

1642

#endif /* __linux__ */

1643

/* Lower privileges */

1644

lower_privileges();

1645

errno = old_errno;

1646

return ret_errno;

1647

}

1648

}

1649

/* Sleep checking until interface is running.

1650

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

1651

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

1652

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

1653

if(ret == -1){

1654

perror_plus("ioctl SIOCGIFFLAGS");

1655

} else if(network.ifr_flags & IFF_RUNNING){

1656

break;

1657

}

1658

struct timespec sleeptime = { .tv_nsec = 250000000 };

1659

ret = nanosleep(&sleeptime, NULL);

1660

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

1661

perror_plus("nanosleep");

1662

}

1663

}

1664

/* Close the socket */

1665

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

1666

if(ret == -1){

1667

perror_plus("close");

1668

}

1669

#ifdef __linux__

1670

if(restore_loglevel){

1671

/* Restores kernel loglevel to default */

1672

ret = klogctl(7, NULL, 0);

1673

if(ret == -1){

1674

perror_plus("klogctl");

1675

}

1676

}

1677

#endif /* __linux__ */

1678

/* Lower privileges */

1679

lower_privileges();

1680

errno = old_errno;

1681

return 0;

1682

}

1683

974

1684

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

975

1685

AvahiSServiceBrowser *sb = NULL;

976

1686

int error;

978

1688

intmax_t tmpmax;

979

1689

char *tmp;

980

1690

int exitcode = EXIT_SUCCESS;

981

const char *interface = "eth0";

1691

const char *interface = "";

982

1692

struct ifreq network;

983

1693

int sd = -1;

984

1694

bool take_down_interface = false;

985

uid_t uid;

986

gid_t gid;

987

char *connect_to = NULL;

988

1695

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

989

1696

bool tempdir_created = false;

990

1697

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

994

1701

bool gnutls_initialized = false;

995

1702

bool gpgme_initialized = false;

996

1703

float delay = 2.5f;

1704

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

1705

retrying the same server again */

997

1706

998

struct sigaction old_sigterm_action;

1707

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

999

1708

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1000

1709

1710

uid = getuid();

1711

gid = getgid();

1712

1713

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

1714

errno = 0;

1715

ret = setgid(gid);

1716

if(ret == -1){

1717

perror_plus("setgid");

1718

}

1719

1720

/* Lower user privileges (temporarily) */

1721

errno = 0;

1722

ret = seteuid(uid);

1723

if(ret == -1){

1724

perror_plus("seteuid");

1725

}

1726

1727

if(quit_now){

1728

goto end;

1729

}

1730

1001

1731

{

1002

1732

struct argp_option options[] = {

1003

1733

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

1032

1762

.arg = "SECONDS",

1033

1763

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

1034

1764

.group = 2 },

1765

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

1766

.arg = "SECONDS",

1767

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

1768

.group = 2 },

1769

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

1770

.arg = "DIR",

1771

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

1772

.group = 2 },

1773

/*

1774

* These reproduce what we would get without ARGP_NO_HELP

1775

*/

1776

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

1777

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

1778

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

1779

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

1780

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

1781

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

1035

1782

{ .name = NULL }

1036

1783

};

1037

1784

1038

1785

error_t parse_opt(int key, char *arg,

1039

1786

struct argp_state *state){

1787

errno = 0;

1040

1788

switch(key){

1041

1789

case 128: /* --debug */

1042

1790

debug = true;

1058

1806

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

1059

1807

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

1060

1808

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

1061

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

1062

exit(EXIT_FAILURE);

1809

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

1063

1810

}

1064

1811

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

1065

1812

break;

1070

1817

errno = 0;

1071

1818

delay = strtof(arg, &tmp);

1072

1819

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

1073

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

1074

exit(EXIT_FAILURE);

1075

}

1076

break;

1077

case ARGP_KEY_ARG:

1078

argp_usage(state);

1079

case ARGP_KEY_END:

1820

argp_error(state, "Bad delay");

1821

}

1822

case 132: /* --retry */

1823

errno = 0;

1824

retry_interval = strtod(arg, &tmp);

1825

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

1826

or (retry_interval * 1000) > INT_MAX

1827

or retry_interval < 0){

1828

argp_error(state, "Bad retry interval");

1829

}

1830

break;

1831

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

1832

hookdir = arg;

1833

break;

1834

/*

1835

* These reproduce what we would get without ARGP_NO_HELP

1836

*/

1837

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

1838

argp_state_help(state, state->out_stream,

1839

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1840

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1841

case -3: /* --usage */

1842

argp_state_help(state, state->out_stream,

1843

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1844

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

1845

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

1846

exit(argp_err_exit_status);

1080

1847

break;

1081

1848

default:

1082

1849

return ARGP_ERR_UNKNOWN;

1083

1850

}

1084

return 0;

1851

return errno;

1085

1852

}

1086

1853

1087

1854

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

1088

1855

.args_doc = "",

1089

1856

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

1090

1857

" passwords from a Mandos server" };

1091

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

1092

if(ret == ARGP_ERR_UNKNOWN){

1093

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

1094

exitcode = EXIT_FAILURE;

1095

goto end;

1096

}

1858

ret = argp_parse(&argp, argc, argv,

1859

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1860

switch(ret){

1861

case 0:

1862

break;

1863

case ENOMEM:

1864

default:

1865

errno = ret;

1866

perror_plus("argp_parse");

1867

exitcode = EX_OSERR;

1868

goto end;

1869

case EINVAL:

1870

exitcode = EX_USAGE;

1871

goto end;

1872

}

1873

}

1874

1875

{

1876

/* Work around Debian bug #633582:

1877

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

1878

1879

/* Re-raise priviliges */

1880

if(raise_privileges() == 0){

1881

struct stat st;

1882

1883

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

1884

int seckey_fd = open(seckey, O_RDONLY);

1885

if(seckey_fd == -1){

1886

perror_plus("open");

1887

} else {

1888

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

1889

if(ret == -1){

1890

perror_plus("fstat");

1891

} else {

1892

if(S_ISREG(st.st_mode)

1893

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

1894

ret = fchown(seckey_fd, uid, gid);

1895

if(ret == -1){

1896

perror_plus("fchown");

1897

}

1898

}

1899

}

1900

TEMP_FAILURE_RETRY(close(seckey_fd));

1901

}

1902

}

1903

1904

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

1905

int pubkey_fd = open(pubkey, O_RDONLY);

1906

if(pubkey_fd == -1){

1907

perror_plus("open");

1908

} else {

1909

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

1910

if(ret == -1){

1911

perror_plus("fstat");

1912

} else {

1913

if(S_ISREG(st.st_mode)

1914

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

1915

ret = fchown(pubkey_fd, uid, gid);

1916

if(ret == -1){

1917

perror_plus("fchown");

1918

}

1919

}

1920

}

1921

TEMP_FAILURE_RETRY(close(pubkey_fd));

1922

}

1923

}

1924

1925

/* Lower privileges */

1926

errno = 0;

1927

ret = seteuid(uid);

1928

if(ret == -1){

1929

perror_plus("seteuid");

1930

}

1931

}

1932

}

1933

1934

/* Run network hooks */

1935

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

1936

goto end;

1097

1937

}

1098

1938

1099

1939

if(not debug){

1100

1940

avahi_set_log_function(empty_log);

1101

1941

}

1102

1942

1943

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

1944

struct dirent **direntries;

1945

/* First look for interfaces that are up */

1946

ret = scandir(sys_class_net, &direntries, up_interface,

1947

alphasort);

1948

if(ret == 0){

1949

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

1950

free(direntries);

1951

ret = scandir(sys_class_net, &direntries, good_interface,

1952

alphasort);

1953

}

1954

if(ret >= 1){

1955

/* Pick the first interface returned */

1956

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

1957

if(debug){

1958

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

1959

}

1960

if(interface == NULL){

1961

perror_plus("malloc");

1962

free(direntries);

1963

exitcode = EXIT_FAILURE;

1964

goto end;

1965

}

1966

free(direntries);

1967

} else {

1968

free(direntries);

1969

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

1970

exitcode = EXIT_FAILURE;

1971

goto end;

1972

}

1973

}

1974

1103

1975

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

1104

1976

from the signal handler */

1105

1977

/* Initialize the pseudo-RNG for Avahi */

1106

1978

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

1107

1979

mc.simple_poll = avahi_simple_poll_new();

1108

1980

if(mc.simple_poll == NULL){

1109

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

1110

exitcode = EXIT_FAILURE;

1981

fprintf_plus(stderr,

1982

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

1983

exitcode = EX_UNAVAILABLE;

1111

1984

goto end;

1112

1985

}

1113

1986

1114

1987

sigemptyset(&sigterm_action.sa_mask);

1115

1988

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

1116

1989

if(ret == -1){

1117

perror("sigaddset");

1118

exitcode = EXIT_FAILURE;

1990

perror_plus("sigaddset");

1991

exitcode = EX_OSERR;

1119

1992

goto end;

1120

1993

}

1121

1994

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

1122

1995

if(ret == -1){

1123

perror("sigaddset");

1124

exitcode = EXIT_FAILURE;

1996

perror_plus("sigaddset");

1997

exitcode = EX_OSERR;

1125

1998

goto end;

1126

1999

}

1127

2000

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

1128

2001

if(ret == -1){

1129

perror("sigaddset");

1130

exitcode = EXIT_FAILURE;

2002

perror_plus("sigaddset");

2003

exitcode = EX_OSERR;

1131

2004

goto end;

1132

2005

}

1133

2006

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

1136

2009

*/

1137

2010

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

1138

2011

if(ret == -1){

1139

perror("sigaction");

1140

return EXIT_FAILURE;

2012

perror_plus("sigaction");

2013

return EX_OSERR;

1141

2014

}

1142

2015

if(old_sigterm_action.sa_handler != SIG_IGN){

1143

2016

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

1144

2017

if(ret == -1){

1145

perror("sigaction");

1146

exitcode = EXIT_FAILURE;

2018

perror_plus("sigaction");

2019

exitcode = EX_OSERR;

1147

2020

goto end;

1148

2021

}

1149

2022

}

1150

2023

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

1151

2024

if(ret == -1){

1152

perror("sigaction");

1153

return EXIT_FAILURE;

2025

perror_plus("sigaction");

2026

return EX_OSERR;

1154

2027

}

1155

2028

if(old_sigterm_action.sa_handler != SIG_IGN){

1156

2029

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

1157

2030

if(ret == -1){

1158

perror("sigaction");

1159

exitcode = EXIT_FAILURE;

2031

perror_plus("sigaction");

2032

exitcode = EX_OSERR;

1160

2033

goto end;

1161

2034

}

1162

2035

}

1163

2036

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

1164

2037

if(ret == -1){

1165

perror("sigaction");

1166

return EXIT_FAILURE;

2038

perror_plus("sigaction");

2039

return EX_OSERR;

1167

2040

}

1168

2041

if(old_sigterm_action.sa_handler != SIG_IGN){

1169

2042

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

1170

2043

if(ret == -1){

1171

perror("sigaction");

1172

exitcode = EXIT_FAILURE;

2044

perror_plus("sigaction");

2045

exitcode = EX_OSERR;

1173

2046

goto end;

1174

2047

}

1175

2048

}

1176

2049

1177

2050

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

1178

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

1179

if_index = (AvahiIfIndex) if_nametoindex(interface);

1180

if(if_index == 0){

1181

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

1182

exitcode = EXIT_FAILURE;

1183

goto end;

1184

}

1185

1186

if(quit_now){

1187

goto end;

1188

}

1189

1190

#ifdef __linux__

1191

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1192

messages to mess up the prompt */

1193

ret = klogctl(8, NULL, 5);

1194

bool restore_loglevel = true;

1195

if(ret == -1){

1196

restore_loglevel = false;

1197

perror("klogctl");

1198

}

1199

#endif /* __linux__ */

1200

1201

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1202

if(sd < 0){

1203

perror("socket");

1204

exitcode = EXIT_FAILURE;

1205

#ifdef __linux__

1206

if(restore_loglevel){

1207

ret = klogctl(7, NULL, 0);

1208

if(ret == -1){

1209

perror("klogctl");

1210

}

1211

}

1212

#endif /* __linux__ */

1213

goto end;

1214

}

1215

strcpy(network.ifr_name, interface);

1216

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

1217

if(ret == -1){

1218

perror("ioctl SIOCGIFFLAGS");

1219

#ifdef __linux__

1220

if(restore_loglevel){

1221

ret = klogctl(7, NULL, 0);

1222

if(ret == -1){

1223

perror("klogctl");

1224

}

1225

}

1226

#endif /* __linux__ */

1227

exitcode = EXIT_FAILURE;

1228

goto end;

1229

}

1230

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

1231

network.ifr_flags |= IFF_UP;

1232

take_down_interface = true;

1233

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

1234

if(ret == -1){

1235

take_down_interface = false;

1236

perror("ioctl SIOCSIFFLAGS");

1237

exitcode = EXIT_FAILURE;

1238

#ifdef __linux__

1239

if(restore_loglevel){

1240

ret = klogctl(7, NULL, 0);

1241

if(ret == -1){

1242

perror("klogctl");

1243

}

1244

}

1245

#endif /* __linux__ */

1246

goto end;

1247

}

1248

}

1249

/* sleep checking until interface is running */

1250

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

1251

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

1252

if(ret == -1){

1253

perror("ioctl SIOCGIFFLAGS");

1254

} else if(network.ifr_flags & IFF_RUNNING){

1255

break;

1256

}

1257

struct timespec sleeptime = { .tv_nsec = 250000000 };

1258

ret = nanosleep(&sleeptime, NULL);

1259

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

1260

perror("nanosleep");

1261

}

1262

}

1263

if(not take_down_interface){

1264

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

1265

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

1266

if(ret == -1){

1267

perror("close");

1268

}

1269

}

1270

#ifdef __linux__

1271

if(restore_loglevel){

1272

/* Restores kernel loglevel to default */

1273

ret = klogctl(7, NULL, 0);

1274

if(ret == -1){

1275

perror("klogctl");

1276

}

1277

}

1278

#endif /* __linux__ */

1279

}

1280

1281

if(quit_now){

1282

goto end;

1283

}

1284

1285

uid = getuid();

1286

gid = getgid();

1287

1288

errno = 0;

1289

setgid(gid);

1290

if(ret == -1){

1291

perror("setgid");

1292

}

1293

1294

ret = setuid(uid);

1295

if(ret == -1){

1296

perror("setuid");

2051

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

2052

ret = bring_up_interface(interface, delay);

2053

if(ret != 0){

2054

errno = ret;

2055

perror_plus("Failed to bring up interface");

2056

}

1297

2057

}

1298

2058

1299

2059

if(quit_now){

1302

2062

1303

2063

ret = init_gnutls_global(pubkey, seckey);

1304

2064

if(ret == -1){

1305

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

1306

exitcode = EXIT_FAILURE;

2065

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

2066

exitcode = EX_UNAVAILABLE;

1307

2067

goto end;

1308

2068

} else {

1309

2069

gnutls_initialized = true;

1313

2073

goto end;

1314

2074

}

1315

2075

2076

if(mkdtemp(tempdir) == NULL){

2077

perror_plus("mkdtemp");

2078

goto end;

2079

}

1316

2080

tempdir_created = true;

1317

if(mkdtemp(tempdir) == NULL){

1318

tempdir_created = false;

1319

perror("mkdtemp");

1320

goto end;

1321

}

1322

2081

1323

2082

if(quit_now){

1324

2083

goto end;

1325

2084

}

1326

2085

1327

2086

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

1328

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

1329

exitcode = EXIT_FAILURE;

2087

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

2088

exitcode = EX_UNAVAILABLE;

1330

2089

goto end;

1331

2090

} else {

1332

2091

gpgme_initialized = true;

1340

2099

/* Connect directly, do not use Zeroconf */

1341

2100

/* (Mainly meant for debugging) */

1342

2101

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

2102

1343

2103

if(address == NULL){

1344

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

1345

exitcode = EXIT_FAILURE;

2104

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

2105

exitcode = EX_USAGE;

1346

2106

goto end;

1347

2107

}

1348

2108

1355

2115

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

1356

2116

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

1357

2117

or tmpmax != (uint16_t)tmpmax){

1358

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

1359

exitcode = EXIT_FAILURE;

2118

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

2119

exitcode = EX_USAGE;

1360

2120

goto end;

1361

2121

}

1362

2122

1366

2126

1367

2127

port = (uint16_t)tmpmax;

1368

2128

*address = '\0';

1369

address = connect_to;

1370

2129

/* Colon in address indicates IPv6 */

1371

2130

int af;

1372

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

2131

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

1373

2132

af = AF_INET6;

2133

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

2134

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

2135

{

2136

connect_to++;

2137

address[-1] = '\0';

2138

}

1374

2139

} else {

1375

2140

af = AF_INET;

1376

2141

}

2142

address = connect_to;

1377

2143

1378

2144

if(quit_now){

1379

2145

goto end;

1380

2146

}

1381

2147

1382

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

1383

if(ret < 0){

1384

exitcode = EXIT_FAILURE;

1385

} else {

2148

while(not quit_now){

2149

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

2150

if(quit_now or ret == 0){

2151

break;

2152

}

2153

if(debug){

2154

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

2155

(int)retry_interval);

2156

}

2157

sleep((int)retry_interval);

2158

}

2159

2160

if (not quit_now){

1386

2161

exitcode = EXIT_SUCCESS;

1387

2162

}

2163

1388

2164

goto end;

1389

2165

}

1390

2166

1412

2188

1413

2189

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

1414

2190

if(mc.server == NULL){

1415

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

1416

avahi_strerror(error));

1417

exitcode = EXIT_FAILURE;

2191

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

2192

avahi_strerror(error));

2193

exitcode = EX_UNAVAILABLE;

1418

2194

goto end;

1419

2195

}

1420

2196

1427

2203

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1428

2204

NULL, 0, browse_callback, NULL);

1429

2205

if(sb == NULL){

1430

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

1431

avahi_strerror(avahi_server_errno(mc.server)));

1432

exitcode = EXIT_FAILURE;

2206

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

2207

avahi_strerror(avahi_server_errno(mc.server)));

2208

exitcode = EX_UNAVAILABLE;

1433

2209

goto end;

1434

2210

}

1435

2211

1440

2216

/* Run the main loop */

1441

2217

1442

2218

if(debug){

1443

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

1444

}

1445

1446

avahi_simple_poll_loop(mc.simple_poll);

2219

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

2220

}

2221

2222

ret = avahi_loop_with_timeout(mc.simple_poll,

2223

(int)(retry_interval * 1000));

2224

if(debug){

2225

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

2226

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

2227

}

1447

2228

1448

2229

end:

1449

2230

1450

2231

if(debug){

1451

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

2232

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

1452

2233

}

1453

2234

1454

2235

/* Cleanup things */

1471

2252

gpgme_release(mc.ctx);

1472

2253

}

1473

2254

1474

/* Take down the network interface */

1475

if(take_down_interface){

1476

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

1477

if(ret == -1){

1478

perror("ioctl SIOCGIFFLAGS");

1479

} else if(network.ifr_flags & IFF_UP) {

1480

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

1481

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

1482

if(ret == -1){

1483

perror("ioctl SIOCSIFFLAGS");

1484

}

1485

}

1486

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

1487

if(ret == -1){

1488

perror("close");

1489

}

1490

}

1491

1492

/* Removes the temp directory used by GPGME */

2255

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

2256

has seen */

2257

if(mc.current_server != NULL){

2258

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

2259

while(mc.current_server != NULL){

2260

server *next = mc.current_server->next;

2261

free(mc.current_server);

2262

mc.current_server = next;

2263

}

2264

}

2265

2266

/* Run network hooks */

2267

run_network_hooks("stop", interface, delay);

2268

2269

/* Re-raise priviliges */

2270

{

2271

raise_privileges();

2272

2273

/* Take down the network interface */

2274

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

2275

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

2276

if(ret == -1){

2277

perror_plus("ioctl SIOCGIFFLAGS");

2278

} else if(network.ifr_flags & IFF_UP){

2279

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

2280

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

2281

if(ret == -1){

2282

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2283

}

2284

}

2285

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

2286

if(ret == -1){

2287

perror_plus("close");

2288

}

2289

}

2290

}

2291

/* Lower privileges permanently */

2292

errno = 0;

2293

ret = setuid(uid);

2294

if(ret == -1){

2295

perror_plus("setuid");

2296

}

2297

2298

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

1493

2299

if(tempdir_created){

1494

DIR *d;

1495

struct dirent *direntry;

1496

d = opendir(tempdir);

1497

if(d == NULL){

1498

if(errno != ENOENT){

1499

perror("opendir");

1500

}

1501

} else {

1502

while(true){

1503

direntry = readdir(d);

1504

if(direntry == NULL){

1505

break;

1506

}

1507

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

1508

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

1509

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

1510

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

1511

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

1512

continue;

1513

}

2300

struct dirent **direntries = NULL;

2301

struct dirent *direntry = NULL;

2302

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

2303

alphasort);

2304

if (numentries > 0){

2305

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

2306

direntry = direntries[i];

1514

2307

char *fullname = NULL;

1515

2308

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

1516

2309

direntry->d_name);

1517

2310

if(ret < 0){

1518

perror("asprintf");

2311

perror_plus("asprintf");

1519

2312

continue;

1520

2313

}

1521

2314

ret = remove(fullname);

1522

2315

if(ret == -1){

1523

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

1524

strerror(errno));

2316

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

2317

strerror(errno));

1525

2318

}

1526

2319

free(fullname);

1527

2320

}

1528

closedir(d);

2321

}

2322

2323

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

2324

free(direntries);

2325

if (numentries == -1){

2326

perror_plus("scandir");

1529

2327

}

1530

2328

ret = rmdir(tempdir);

1531

2329

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

1532

perror("rmdir");

2330

perror_plus("rmdir");

1533

2331

}

1534

2332

}

1535

2333

1536

2334

if(quit_now){

1537

2335

sigemptyset(&old_sigterm_action.sa_mask);

1538

2336

old_sigterm_action.sa_handler = SIG_DFL;

1539

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

2337

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

2338

&old_sigterm_action,

2339

NULL));

1540

2340

if(ret == -1){

1541

perror("sigaction");

1542

}

1543

raise(signal_received);

2341

perror_plus("sigaction");

2342

}

2343

do {

2344

ret = raise(signal_received);

2345

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

2346

if(ret != 0){

2347

perror_plus("raise");

2348

abort();

2349

}

2350

TEMP_FAILURE_RETRY(pause());

1544

2351

}

1545

2352

1546

2353

return exitcode;