/mandos/trunk : revision 594.1.3

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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(), abort() */

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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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*/

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

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

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setgid(), pause() */

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

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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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91

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#ifdef __linux__

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

105

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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117

/* GPGME */

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118

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

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126

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

121

127

#define SECKEY "seckey.txt"

122

128

#define PUBKEY "pubkey.txt"

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

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130

124

131

bool debug = false;

125

132

static const char mandos_protocol_version[] = "1";

126

133

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

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

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

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static const char sys_class_net[] = "/sys/class/net";

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char *connect_to = NULL;

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const char *hookdir = HOOKDIR;

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uid_t uid = 65534;

139

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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169

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sig_atomic_t quit_now = 0;

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171

int signal_received = 0;

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172

173

/* Function to use when printing errors */

174

void perror_plus(const char *print_text){

175

int e = errno;

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

177

program_invocation_short_name);

178

errno = e;

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perror(print_text);

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}

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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));

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

190

}

191

148

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/*

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193

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

150

194

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

151

195

* "buffer_length" is how much is already used.

152

196

*/

153

197

size_t incbuffer(char **buffer, size_t buffer_length,

154

size_t buffer_capacity){

198

size_t buffer_capacity){

155

199

if(buffer_length + BUFFER_SIZE > buffer_capacity){

156

200

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

157

201

if(buffer == NULL){

162

206

return buffer_capacity;

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207

}

164

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,

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.if_index = if_index,

221

.af = af };

222

if(new_server->ip == NULL){

223

perror_plus("strdup");

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return false;

225

}

226

/* Special case of first server */

227

if (mc.current_server == NULL){

228

new_server->next = new_server;

229

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;

234

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

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new_server->prev->next = new_server;

236

mc.current_server->prev = new_server;

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}

238

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

239

if(ret == -1){

240

perror_plus("clock_gettime");

241

return false;

242

}

243

return true;

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}

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/*

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* Initialize GPGME.

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248

*/

168

static bool init_gpgme(const char *seckey,

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const char *pubkey, const char *tempdir){

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

250

const char *tempdir){

170

251

gpgme_error_t rc;

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252

gpgme_engine_info_t engine_info;

172

253

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182

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

183

264

if(fd == -1){

184

perror("open");

265

perror_plus("open");

185

266

return false;

186

267

}

187

268

188

269

rc = gpgme_data_new_from_fd(&pgp_data, fd);

189

270

if(rc != GPG_ERR_NO_ERROR){

190

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

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gpgme_strsource(rc), gpgme_strerror(rc));

271

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

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gpgme_strsource(rc), gpgme_strerror(rc));

192

273

return false;

193

274

}

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275

195

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rc = gpgme_op_import(mc.ctx, pgp_data);

196

277

if(rc != GPG_ERR_NO_ERROR){

197

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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281

}

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282

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

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284

if(ret == -1){

204

perror("close");

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perror_plus("close");

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286

}

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gpgme_data_release(pgp_data);

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return true;

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289

}

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if(debug){

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

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));

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

300

gpgme_strsource(rc), gpgme_strerror(rc));

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301

return false;

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302

}

222

303

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

304

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

224

305

rc = gpgme_get_engine_info(&engine_info);

225

306

if(rc != GPG_ERR_NO_ERROR){

226

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));

228

309

return false;

229

310

}

230

311

while(engine_info != NULL){

236

317

engine_info = engine_info->next;

237

318

}

238

319

if(engine_info == NULL){

239

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);

240

322

return false;

241

323

}

242

324

243

325

/* Create new GPGME "context" */

244

326

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

245

327

if(rc != GPG_ERR_NO_ERROR){

246

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

247

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));

248

331

return false;

249

332

}

250

333

269

352

ssize_t plaintext_length = 0;

270

353

271

354

if(debug){

272

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

355

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

273

356

}

274

357

275

358

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

276

359

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

277

360

0);

278

361

if(rc != GPG_ERR_NO_ERROR){

279

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

280

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));

281

364

return -1;

282

365

}

283

366

284

367

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

285

368

rc = gpgme_data_new(&dh_plain);

286

369

if(rc != GPG_ERR_NO_ERROR){

287

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

288

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));

289

373

gpgme_data_release(dh_crypto);

290

374

return -1;

291

375

}

294

378

data buffer */

295

379

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

296

380

if(rc != GPG_ERR_NO_ERROR){

297

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

298

gpgme_strsource(rc), gpgme_strerror(rc));

381

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

382

gpgme_strsource(rc), gpgme_strerror(rc));

299

383

plaintext_length = -1;

300

384

if(debug){

301

385

gpgme_decrypt_result_t result;

302

386

result = gpgme_op_decrypt_result(mc.ctx);

303

387

if(result == NULL){

304

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

388

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

305

389

} else {

306

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

307

result->unsupported_algorithm);

308

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

309

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);

310

394

if(result->file_name != NULL){

311

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

395

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

312

396

}

313

397

gpgme_recipient_t recipient;

314

398

recipient = result->recipients;

315

399

while(recipient != NULL){

316

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

317

gpgme_pubkey_algo_name(recipient->pubkey_algo));

318

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

319

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

320

recipient->status == GPG_ERR_NO_SECKEY

321

? "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");

322

407

recipient = recipient->next;

323

408

}

324

409

}

327

412

}

328

413

329

414

if(debug){

330

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

415

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

331

416

}

332

417

333

418

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

334

419

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

335

perror("gpgme_data_seek");

420

perror_plus("gpgme_data_seek");

336

421

plaintext_length = -1;

337

422

goto decrypt_end;

338

423

}

340

425

*plaintext = NULL;

341

426

while(true){

342

427

plaintext_capacity = incbuffer(plaintext,

343

(size_t)plaintext_length,

344

plaintext_capacity);

428

(size_t)plaintext_length,

429

plaintext_capacity);

345

430

if(plaintext_capacity == 0){

346

perror("incbuffer");

347

plaintext_length = -1;

348

goto decrypt_end;

431

perror_plus("incbuffer");

432

plaintext_length = -1;

433

goto decrypt_end;

349

434

}

350

435

351

436

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

356

441

break;

357

442

}

358

443

if(ret < 0){

359

perror("gpgme_data_read");

444

perror_plus("gpgme_data_read");

360

445

plaintext_length = -1;

361

446

goto decrypt_end;

362

447

}

364

449

}

365

450

366

451

if(debug){

367

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

452

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

368

453

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

369

454

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

370

455

}

392

477

/* GnuTLS log function callback */

393

478

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

394

479

const char* string){

395

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

480

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

396

481

}

397

482

398

483

static int init_gnutls_global(const char *pubkeyfilename,

400

485

int ret;

401

486

402

487

if(debug){

403

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

488

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

404

489

}

405

490

406

491

ret = gnutls_global_init();

407

492

if(ret != GNUTLS_E_SUCCESS){

408

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

409

safer_gnutls_strerror(ret));

493

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

494

safer_gnutls_strerror(ret));

410

495

return -1;

411

496

}

412

497

419

504

}

420

505

421

506

/* OpenPGP credentials */

422

gnutls_certificate_allocate_credentials(&mc.cred);

507

ret = gnutls_certificate_allocate_credentials(&mc.cred);

423

508

if(ret != GNUTLS_E_SUCCESS){

424

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

425

from

426

-Wunreachable-code

427

*/

428

safer_gnutls_strerror(ret));

509

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

510

safer_gnutls_strerror(ret));

429

511

gnutls_global_deinit();

430

512

return -1;

431

513

}

432

514

433

515

if(debug){

434

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

435

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

436

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);

437

520

}

438

521

439

522

ret = gnutls_certificate_set_openpgp_key_file

440

523

(mc.cred, pubkeyfilename, seckeyfilename,

441

524

GNUTLS_OPENPGP_FMT_BASE64);

442

525

if(ret != GNUTLS_E_SUCCESS){

443

fprintf(stderr,

444

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

445

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

446

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

447

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));

448

531

goto globalfail;

449

532

}

450

533

451

534

/* GnuTLS server initialization */

452

535

ret = gnutls_dh_params_init(&mc.dh_params);

453

536

if(ret != GNUTLS_E_SUCCESS){

454

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

455

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

537

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

538

" initialization: %s\n",

539

safer_gnutls_strerror(ret));

456

540

goto globalfail;

457

541

}

458

542

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

459

543

if(ret != GNUTLS_E_SUCCESS){

460

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

461

safer_gnutls_strerror(ret));

544

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

545

safer_gnutls_strerror(ret));

462

546

goto globalfail;

463

547

}

464

548

484

568

}

485

569

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

486

570

if(ret != GNUTLS_E_SUCCESS){

487

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

488

safer_gnutls_strerror(ret));

571

fprintf_plus(stderr,

572

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

573

safer_gnutls_strerror(ret));

489

574

}

490

575

491

576

{

498

583

}

499

584

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

500

585

if(ret != GNUTLS_E_SUCCESS){

501

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

502

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

503

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));

504

589

gnutls_deinit(*session);

505

590

return -1;

506

591

}

515

600

}

516

601

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

517

602

if(ret != GNUTLS_E_SUCCESS){

518

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

519

safer_gnutls_strerror(ret));

603

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

604

safer_gnutls_strerror(ret));

520

605

gnutls_deinit(*session);

521

606

return -1;

522

607

}

552

637

gnutls_session_t session;

553

638

int pf; /* Protocol family */

554

639

640

errno = 0;

641

555

642

if(quit_now){

643

errno = EINTR;

556

644

return -1;

557

645

}

558

646

564

652

pf = PF_INET;

565

653

break;

566

654

default:

567

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

655

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

656

errno = EINVAL;

568

657

return -1;

569

658

}

570

659

574

663

}

575

664

576

665

if(debug){

577

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

578

"\n", ip, port);

666

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

667

PRIu16 "\n", ip, port);

579

668

}

580

669

581

670

tcp_sd = socket(pf, SOCK_STREAM, 0);

582

671

if(tcp_sd < 0){

583

perror("socket");

672

int e = errno;

673

perror_plus("socket");

674

errno = e;

584

675

goto mandos_end;

585

676

}

586

677

587

678

if(quit_now){

679

errno = EINTR;

588

680

goto mandos_end;

589

681

}

590

682

597

689

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

598

690

}

599

691

if(ret < 0 ){

600

perror("inet_pton");

692

int e = errno;

693

perror_plus("inet_pton");

694

errno = e;

601

695

goto mandos_end;

602

696

}

603

697

if(ret == 0){

604

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

698

int e = errno;

699

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

700

errno = e;

605

701

goto mandos_end;

606

702

}

607

703

if(af == AF_INET6){

611

707

612

708

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

613

709

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

614

-Wunreachable-code*/

710

-Wunreachable-code*/

615

711

if(if_index == AVAHI_IF_UNSPEC){

616

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

617

" without a network interface\n");

712

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

713

" incomplete without a network interface\n");

714

errno = EINVAL;

618

715

goto mandos_end;

619

716

}

620

717

/* Set the network interface number as scope */

627

724

}

628

725

629

726

if(quit_now){

727

errno = EINTR;

630

728

goto mandos_end;

631

729

}

632

730

634

732

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

635

733

char interface[IF_NAMESIZE];

636

734

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

637

perror("if_indextoname");

735

perror_plus("if_indextoname");

638

736

} else {

639

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

640

ip, interface, port);

737

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

738

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

641

739

}

642

740

} else {

643

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

644

port);

741

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

742

ip, port);

645

743

}

646

744

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

647

745

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

654

752

sizeof(addrstr));

655

753

}

656

754

if(pcret == NULL){

657

perror("inet_ntop");

755

perror_plus("inet_ntop");

658

756

} else {

659

757

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

660

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

758

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

661

759

}

662

760

}

663

761

}

664

762

665

763

if(quit_now){

764

errno = EINTR;

666

765

goto mandos_end;

667

766

}

668

767

672

771

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

673

772

}

674

773

if(ret < 0){

675

perror("connect");

774

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

775

int e = errno;

776

perror_plus("connect");

777

errno = e;

778

}

676

779

goto mandos_end;

677

780

}

678

781

679

782

if(quit_now){

783

errno = EINTR;

680

784

goto mandos_end;

681

785

}

682

786

685

789

while(true){

686

790

size_t out_size = strlen(out);

687

791

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

688

out_size - written));

792

out_size - written));

689

793

if(ret == -1){

690

perror("write");

794

int e = errno;

795

perror_plus("write");

796

errno = e;

691

797

goto mandos_end;

692

798

}

693

799

written += (size_t)ret;

703

809

}

704

810

705

811

if(quit_now){

812

errno = EINTR;

706

813

goto mandos_end;

707

814

}

708

815

}

709

816

710

817

if(debug){

711

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

818

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

712

819

}

713

820

714

821

if(quit_now){

822

errno = EINTR;

715

823

goto mandos_end;

716

824

}

717

825

718

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);

719

831

720

832

if(quit_now){

833

errno = EINTR;

721

834

goto mandos_end;

722

835

}

723

836

724

837

do {

725

838

ret = gnutls_handshake(session);

726

839

if(quit_now){

840

errno = EINTR;

727

841

goto mandos_end;

728

842

}

729

843

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

730

844

731

845

if(ret != GNUTLS_E_SUCCESS){

732

846

if(debug){

733

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

847

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

734

848

gnutls_perror(ret);

735

849

}

850

errno = EPROTO;

736

851

goto mandos_end;

737

852

}

738

853

739

854

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

740

855

741

856

if(debug){

742

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

743

ip);

857

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

858

" %s\n", ip);

744

859

}

745

860

746

861

while(true){

747

862

748

863

if(quit_now){

864

errno = EINTR;

749

865

goto mandos_end;

750

866

}

751

867

752

868

buffer_capacity = incbuffer(&buffer, buffer_length,

753

buffer_capacity);

869

buffer_capacity);

754

870

if(buffer_capacity == 0){

755

perror("incbuffer");

871

int e = errno;

872

perror_plus("incbuffer");

873

errno = e;

756

874

goto mandos_end;

757

875

}

758

876

759

877

if(quit_now){

878

errno = EINTR;

760

879

goto mandos_end;

761

880

}

762

881

775

894

ret = gnutls_handshake(session);

776

895

777

896

if(quit_now){

897

errno = EINTR;

778

898

goto mandos_end;

779

899

}

780

900

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

781

901

if(ret < 0){

782

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

902

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

903

"***\n");

783

904

gnutls_perror(ret);

905

errno = EPROTO;

784

906

goto mandos_end;

785

907

}

786

908

break;

787

909

default:

788

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

789

" encrypted session with Mandos server\n");

910

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

911

" encrypted session with Mandos server\n");

790

912

gnutls_bye(session, GNUTLS_SHUT_RDWR);

913

errno = EIO;

791

914

goto mandos_end;

792

915

}

793

916

} else {

796

919

}

797

920

798

921

if(debug){

799

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

922

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

800

923

}

801

924

802

925

if(quit_now){

926

errno = EINTR;

803

927

goto mandos_end;

804

928

}

805

929

806

930

do {

807

931

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

808

932

if(quit_now){

933

errno = EINTR;

809

934

goto mandos_end;

810

935

}

811

936

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

812

937

813

938

if(buffer_length > 0){

814

939

ssize_t decrypted_buffer_size;

815

decrypted_buffer_size = pgp_packet_decrypt(buffer,

816

buffer_length,

940

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

817

941

&decrypted_buffer);

818

942

if(decrypted_buffer_size >= 0){

819

943

820

944

written = 0;

821

945

while(written < (size_t) decrypted_buffer_size){

822

946

if(quit_now){

947

errno = EINTR;

823

948

goto mandos_end;

824

949

}

825

950

827

952

(size_t)decrypted_buffer_size - written,

828

953

stdout);

829

954

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

955

int e = errno;

830

956

if(debug){

831

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

832

strerror(errno));

957

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

958

strerror(errno));

833

959

}

960

errno = e;

834

961

goto mandos_end;

835

962

}

836

963

written += (size_t)ret;

842

969

/* Shutdown procedure */

843

970

844

971

mandos_end:

845

free(decrypted_buffer);

846

free(buffer);

847

if(tcp_sd >= 0){

848

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

849

}

850

if(ret == -1){

851

perror("close");

852

}

853

gnutls_deinit(session);

854

if(quit_now){

855

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

}

856

991

}

857

992

return retval;

858

993

}

883

1018

switch(event){

884

1019

default:

885

1020

case AVAHI_RESOLVER_FAILURE:

886

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

887

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

888

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)));

889

1025

break;

890

1026

891

1027

case AVAHI_RESOLVER_FOUND:

893

1029

char ip[AVAHI_ADDRESS_STR_MAX];

894

1030

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

895

1031

if(debug){

896

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

897

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

898

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);

899

1035

}

900

1036

int ret = start_mandos_communication(ip, port, interface,

901

1037

avahi_proto_to_af(proto));

902

1038

if(ret == 0){

903

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

}

904

1046

}

905

1047

}

906

1048

}

930

1072

default:

931

1073

case AVAHI_BROWSER_FAILURE:

932

1074

933

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

934

avahi_strerror(avahi_server_errno(mc.server)));

1075

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

1076

avahi_strerror(avahi_server_errno(mc.server)));

935

1077

avahi_simple_poll_quit(mc.simple_poll);

936

1078

return;

937

1079

944

1086

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

945

1087

name, type, domain, protocol, 0,

946

1088

resolve_callback, NULL) == NULL)

947

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

948

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)));

949

1092

break;

950

1093

951

1094

case AVAHI_BROWSER_REMOVE:

954

1097

case AVAHI_BROWSER_ALL_FOR_NOW:

955

1098

case AVAHI_BROWSER_CACHE_EXHAUSTED:

956

1099

if(debug){

957

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

1100

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

1101

" searching...\n");

958

1102

}

959

1103

break;

960

1104

}

961

1105

}

962

1106

963

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

1107

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

964

1108

static void handle_sigterm(int sig){

965

1109

if(quit_now){

966

1110

return;

968

1112

quit_now = 1;

969

1113

signal_received = sig;

970

1114

int old_errno = errno;

1115

/* set main loop to exit */

971

1116

if(mc.simple_poll != NULL){

972

1117

avahi_simple_poll_quit(mc.simple_poll);

973

1118

}

974

1119

errno = old_errno;

975

1120

}

976

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

977

1684

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

978

1685

AvahiSServiceBrowser *sb = NULL;

979

1686

int error;

981

1688

intmax_t tmpmax;

982

1689

char *tmp;

983

1690

int exitcode = EXIT_SUCCESS;

984

const char *interface = "eth0";

1691

const char *interface = "";

985

1692

struct ifreq network;

986

1693

int sd = -1;

987

1694

bool take_down_interface = false;

988

uid_t uid;

989

gid_t gid;

990

char *connect_to = NULL;

991

1695

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

992

1696

bool tempdir_created = false;

993

1697

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

997

1701

bool gnutls_initialized = false;

998

1702

bool gpgme_initialized = false;

999

1703

float delay = 2.5f;

1704

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

1705

retrying the same server again */

1000

1706

1001

1707

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1002

1708

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1008

1714

errno = 0;

1009

1715

ret = setgid(gid);

1010

1716

if(ret == -1){

1011

perror("setgid");

1717

perror_plus("setgid");

1012

1718

}

1013

1719

1014

1720

/* Lower user privileges (temporarily) */

1015

1721

errno = 0;

1016

1722

ret = seteuid(uid);

1017

1723

if(ret == -1){

1018

perror("seteuid");

1724

perror_plus("seteuid");

1019

1725

}

1020

1726

1021

1727

if(quit_now){

1056

1762

.arg = "SECONDS",

1057

1763

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

1058

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 },

1059

1782

{ .name = NULL }

1060

1783

};

1061

1784

1062

1785

error_t parse_opt(int key, char *arg,

1063

1786

struct argp_state *state){

1787

errno = 0;

1064

1788

switch(key){

1065

1789

case 128: /* --debug */

1066

1790

debug = true;

1082

1806

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

1083

1807

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

1084

1808

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

1085

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

1086

exit(EXIT_FAILURE);

1809

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

1087

1810

}

1088

1811

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

1089

1812

break;

1094

1817

errno = 0;

1095

1818

delay = strtof(arg, &tmp);

1096

1819

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

1097

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

1098

exit(EXIT_FAILURE);

1099

}

1100

break;

1101

case ARGP_KEY_ARG:

1102

argp_usage(state);

1103

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);

1104

1847

break;

1105

1848

default:

1106

1849

return ARGP_ERR_UNKNOWN;

1107

1850

}

1108

return 0;

1851

return errno;

1109

1852

}

1110

1853

1111

1854

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

1112

1855

.args_doc = "",

1113

1856

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

1114

1857

" passwords from a Mandos server" };

1115

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

1116

if(ret == ARGP_ERR_UNKNOWN){

1117

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

1118

exitcode = EXIT_FAILURE;

1119

goto end;

1120

}

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;

1121

1937

}

1122

1938

1123

1939

if(not debug){

1124

1940

avahi_set_log_function(empty_log);

1125

1941

}

1126

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

1127

1975

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

1128

1976

from the signal handler */

1129

1977

/* Initialize the pseudo-RNG for Avahi */

1130

1978

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

1131

1979

mc.simple_poll = avahi_simple_poll_new();

1132

1980

if(mc.simple_poll == NULL){

1133

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

1134

exitcode = EXIT_FAILURE;

1981

fprintf_plus(stderr,

1982

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

1983

exitcode = EX_UNAVAILABLE;

1135

1984

goto end;

1136

1985

}

1137

1986

1138

1987

sigemptyset(&sigterm_action.sa_mask);

1139

1988

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

1140

1989

if(ret == -1){

1141

perror("sigaddset");

1142

exitcode = EXIT_FAILURE;

1990

perror_plus("sigaddset");

1991

exitcode = EX_OSERR;

1143

1992

goto end;

1144

1993

}

1145

1994

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

1146

1995

if(ret == -1){

1147

perror("sigaddset");

1148

exitcode = EXIT_FAILURE;

1996

perror_plus("sigaddset");

1997

exitcode = EX_OSERR;

1149

1998

goto end;

1150

1999

}

1151

2000

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

1152

2001

if(ret == -1){

1153

perror("sigaddset");

1154

exitcode = EXIT_FAILURE;

2002

perror_plus("sigaddset");

2003

exitcode = EX_OSERR;

1155

2004

goto end;

1156

2005

}

1157

2006

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

1160

2009

*/

1161

2010

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

1162

2011

if(ret == -1){

1163

perror("sigaction");

1164

return EXIT_FAILURE;

2012

perror_plus("sigaction");

2013

return EX_OSERR;

1165

2014

}

1166

2015

if(old_sigterm_action.sa_handler != SIG_IGN){

1167

2016

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

1168

2017

if(ret == -1){

1169

perror("sigaction");

1170

exitcode = EXIT_FAILURE;

2018

perror_plus("sigaction");

2019

exitcode = EX_OSERR;

1171

2020

goto end;

1172

2021

}

1173

2022

}

1174

2023

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

1175

2024

if(ret == -1){

1176

perror("sigaction");

1177

return EXIT_FAILURE;

2025

perror_plus("sigaction");

2026

return EX_OSERR;

1178

2027

}

1179

2028

if(old_sigterm_action.sa_handler != SIG_IGN){

1180

2029

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

1181

2030

if(ret == -1){

1182

perror("sigaction");

1183

exitcode = EXIT_FAILURE;

2031

perror_plus("sigaction");

2032

exitcode = EX_OSERR;

1184

2033

goto end;

1185

2034

}

1186

2035

}

1187

2036

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

1188

2037

if(ret == -1){

1189

perror("sigaction");

1190

return EXIT_FAILURE;

2038

perror_plus("sigaction");

2039

return EX_OSERR;

1191

2040

}

1192

2041

if(old_sigterm_action.sa_handler != SIG_IGN){

1193

2042

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

1194

2043

if(ret == -1){

1195

perror("sigaction");

1196

exitcode = EXIT_FAILURE;

2044

perror_plus("sigaction");

2045

exitcode = EX_OSERR;

1197

2046

goto end;

1198

2047

}

1199

2048

}

1200

2049

1201

2050

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

1202

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

1203

if_index = (AvahiIfIndex) if_nametoindex(interface);

1204

if(if_index == 0){

1205

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

1206

exitcode = EXIT_FAILURE;

1207

goto end;

1208

}

1209

1210

if(quit_now){

1211

goto end;

1212

}

1213

1214

/* Re-raise priviliges */

1215

errno = 0;

1216

ret = seteuid(0);

1217

if(ret == -1){

1218

perror("seteuid");

1219

}

1220

1221

#ifdef __linux__

1222

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1223

messages to mess up the prompt */

1224

ret = klogctl(8, NULL, 5);

1225

bool restore_loglevel = true;

1226

if(ret == -1){

1227

restore_loglevel = false;

1228

perror("klogctl");

1229

}

1230

#endif /* __linux__ */

1231

1232

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1233

if(sd < 0){

1234

perror("socket");

1235

exitcode = EXIT_FAILURE;

1236

#ifdef __linux__

1237

if(restore_loglevel){

1238

ret = klogctl(7, NULL, 0);

1239

if(ret == -1){

1240

perror("klogctl");

1241

}

1242

}

1243

#endif /* __linux__ */

1244

/* Lower privileges */

1245

errno = 0;

1246

ret = seteuid(uid);

1247

if(ret == -1){

1248

perror("seteuid");

1249

}

1250

goto end;

1251

}

1252

strcpy(network.ifr_name, interface);

1253

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

1254

if(ret == -1){

1255

perror("ioctl SIOCGIFFLAGS");

1256

#ifdef __linux__

1257

if(restore_loglevel){

1258

ret = klogctl(7, NULL, 0);

1259

if(ret == -1){

1260

perror("klogctl");

1261

}

1262

}

1263

#endif /* __linux__ */

1264

exitcode = EXIT_FAILURE;

1265

/* Lower privileges */

1266

errno = 0;

1267

ret = seteuid(uid);

1268

if(ret == -1){

1269

perror("seteuid");

1270

}

1271

goto end;

1272

}

1273

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

1274

network.ifr_flags |= IFF_UP;

1275

take_down_interface = true;

1276

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

1277

if(ret == -1){

1278

take_down_interface = false;

1279

perror("ioctl SIOCSIFFLAGS");

1280

exitcode = EXIT_FAILURE;

1281

#ifdef __linux__

1282

if(restore_loglevel){

1283

ret = klogctl(7, NULL, 0);

1284

if(ret == -1){

1285

perror("klogctl");

1286

}

1287

}

1288

#endif /* __linux__ */

1289

/* Lower privileges */

1290

errno = 0;

1291

ret = seteuid(uid);

1292

if(ret == -1){

1293

perror("seteuid");

1294

}

1295

goto end;

1296

}

1297

}

1298

/* sleep checking until interface is running */

1299

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

1300

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

1301

if(ret == -1){

1302

perror("ioctl SIOCGIFFLAGS");

1303

} else if(network.ifr_flags & IFF_RUNNING){

1304

break;

1305

}

1306

struct timespec sleeptime = { .tv_nsec = 250000000 };

1307

ret = nanosleep(&sleeptime, NULL);

1308

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

1309

perror("nanosleep");

1310

}

1311

}

1312

if(not take_down_interface){

1313

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

1314

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

1315

if(ret == -1){

1316

perror("close");

1317

}

1318

}

1319

#ifdef __linux__

1320

if(restore_loglevel){

1321

/* Restores kernel loglevel to default */

1322

ret = klogctl(7, NULL, 0);

1323

if(ret == -1){

1324

perror("klogctl");

1325

}

1326

}

1327

#endif /* __linux__ */

1328

/* Lower privileges */

1329

errno = 0;

1330

if(take_down_interface){

1331

/* Lower privileges */

1332

ret = seteuid(uid);

1333

if(ret == -1){

1334

perror("seteuid");

1335

}

1336

} else {

1337

/* Lower privileges permanently */

1338

ret = setuid(uid);

1339

if(ret == -1){

1340

perror("setuid");

1341

}

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");

1342

2056

}

1343

2057

}

1344

2058

1348

2062

1349

2063

ret = init_gnutls_global(pubkey, seckey);

1350

2064

if(ret == -1){

1351

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

1352

exitcode = EXIT_FAILURE;

2065

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

2066

exitcode = EX_UNAVAILABLE;

1353

2067

goto end;

1354

2068

} else {

1355

2069

gnutls_initialized = true;

1359

2073

goto end;

1360

2074

}

1361

2075

2076

if(mkdtemp(tempdir) == NULL){

2077

perror_plus("mkdtemp");

2078

goto end;

2079

}

1362

2080

tempdir_created = true;

1363

if(mkdtemp(tempdir) == NULL){

1364

tempdir_created = false;

1365

perror("mkdtemp");

1366

goto end;

1367

}

1368

2081

1369

2082

if(quit_now){

1370

2083

goto end;

1371

2084

}

1372

2085

1373

2086

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

1374

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

1375

exitcode = EXIT_FAILURE;

2087

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

2088

exitcode = EX_UNAVAILABLE;

1376

2089

goto end;

1377

2090

} else {

1378

2091

gpgme_initialized = true;

1386

2099

/* Connect directly, do not use Zeroconf */

1387

2100

/* (Mainly meant for debugging) */

1388

2101

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

2102

1389

2103

if(address == NULL){

1390

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

1391

exitcode = EXIT_FAILURE;

2104

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

2105

exitcode = EX_USAGE;

1392

2106

goto end;

1393

2107

}

1394

2108

1401

2115

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

1402

2116

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

1403

2117

or tmpmax != (uint16_t)tmpmax){

1404

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

1405

exitcode = EXIT_FAILURE;

2118

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

2119

exitcode = EX_USAGE;

1406

2120

goto end;

1407

2121

}

1408

2122

1412

2126

1413

2127

port = (uint16_t)tmpmax;

1414

2128

*address = '\0';

1415

address = connect_to;

1416

2129

/* Colon in address indicates IPv6 */

1417

2130

int af;

1418

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

2131

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

1419

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

}

1420

2139

} else {

1421

2140

af = AF_INET;

1422

2141

}

2142

address = connect_to;

1423

2143

1424

2144

if(quit_now){

1425

2145

goto end;

1426

2146

}

1427

2147

1428

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

1429

if(ret < 0){

1430

exitcode = EXIT_FAILURE;

1431

} 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){

1432

2161

exitcode = EXIT_SUCCESS;

1433

2162

}

2163

1434

2164

goto end;

1435

2165

}

1436

2166

1458

2188

1459

2189

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

1460

2190

if(mc.server == NULL){

1461

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

1462

avahi_strerror(error));

1463

exitcode = EXIT_FAILURE;

2191

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

2192

avahi_strerror(error));

2193

exitcode = EX_UNAVAILABLE;

1464

2194

goto end;

1465

2195

}

1466

2196

1473

2203

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1474

2204

NULL, 0, browse_callback, NULL);

1475

2205

if(sb == NULL){

1476

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

1477

avahi_strerror(avahi_server_errno(mc.server)));

1478

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;

1479

2209

goto end;

1480

2210

}

1481

2211

1486

2216

/* Run the main loop */

1487

2217

1488

2218

if(debug){

1489

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

1490

}

1491

1492

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

}

1493

2228

1494

2229

end:

1495

2230

1496

2231

if(debug){

1497

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

2232

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

1498

2233

}

1499

2234

1500

2235

/* Cleanup things */

1517

2252

gpgme_release(mc.ctx);

1518

2253

}

1519

2254

1520

/* Take down the network interface */

1521

if(take_down_interface){

1522

/* Re-raise priviliges */

1523

errno = 0;

1524

ret = seteuid(0);

1525

if(ret == -1){

1526

perror("seteuid");

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;

1527

2263

}

1528

if(geteuid() == 0){

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){

1529

2275

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

1530

2276

if(ret == -1){

1531

perror("ioctl SIOCGIFFLAGS");

1532

} else if(network.ifr_flags & IFF_UP) {

1533

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

2277

perror_plus("ioctl SIOCGIFFLAGS");

2278

} else if(network.ifr_flags & IFF_UP){

2279

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

1534

2280

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

1535

2281

if(ret == -1){

1536

perror("ioctl SIOCSIFFLAGS");

2282

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1537

2283

}

1538

2284

}

1539

2285

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

1540

2286

if(ret == -1){

1541

perror("close");

1542

}

1543

/* Lower privileges permanently */

1544

errno = 0;

1545

ret = setuid(uid);

1546

if(ret == -1){

1547

perror("setuid");

2287

perror_plus("close");

1548

2288

}

1549

2289

}

1550

2290

}

2291

/* Lower privileges permanently */

2292

errno = 0;

2293

ret = setuid(uid);

2294

if(ret == -1){

2295

perror_plus("setuid");

2296

}

1551

2297

1552

/* Removes the temp directory used by GPGME */

2298

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

1553

2299

if(tempdir_created){

1554

DIR *d;

1555

struct dirent *direntry;

1556

d = opendir(tempdir);

1557

if(d == NULL){

1558

if(errno != ENOENT){

1559

perror("opendir");

1560

}

1561

} else {

1562

while(true){

1563

direntry = readdir(d);

1564

if(direntry == NULL){

1565

break;

1566

}

1567

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

1568

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

1569

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

1570

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

1571

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

1572

continue;

1573

}

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];

1574

2307

char *fullname = NULL;

1575

2308

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

1576

2309

direntry->d_name);

1577

2310

if(ret < 0){

1578

perror("asprintf");

2311

perror_plus("asprintf");

1579

2312

continue;

1580

2313

}

1581

2314

ret = remove(fullname);

1582

2315

if(ret == -1){

1583

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

1584

strerror(errno));

2316

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

2317

strerror(errno));

1585

2318

}

1586

2319

free(fullname);

1587

2320

}

1588

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");

1589

2327

}

1590

2328

ret = rmdir(tempdir);

1591

2329

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

1592

perror("rmdir");

2330

perror_plus("rmdir");

1593

2331

}

1594

2332

}

1595

2333

1600

2338

&old_sigterm_action,

1601

2339

NULL));

1602

2340

if(ret == -1){

1603

perror("sigaction");

2341

perror_plus("sigaction");

1604

2342

}

1605

2343

do {

1606

2344

ret = raise(signal_received);

1607

2345

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

1608

2346

if(ret != 0){

1609

perror("raise");

2347

perror_plus("raise");

1610

2348

abort();

1611

2349

}

1612

2350

TEMP_FAILURE_RETRY(pause());