/mandos/trunk : revision 314

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

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*

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* Everything else is

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*

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

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

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* along with this program. If not, see

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

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*

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

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

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*/

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

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#ifndef _LARGEFILE_SOURCE

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33

#define _LARGEFILE_SOURCE

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#endif

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#ifndef _FILE_OFFSET_BITS

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#define _FILE_OFFSET_BITS 64

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#endif

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

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stdout, ferror(), remove() */

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

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

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

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strtof(), abort() */

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

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srand(), strtof() */

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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(), S_ISREG */

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

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

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inet_pton(), connect() */

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#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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program_invocation_short_name */

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

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

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

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

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SIOCSIFFLAGS, if_indextoname(),

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if_nametoindex(), IF_NAMESIZE */

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

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setgid() */

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

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

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

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argp_state, struct argp,

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argp_parse(), ARGP_KEY_ARG,

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ARGP_KEY_END, ARGP_ERR_UNKNOWN */

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

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sigaction(), SIGTERM, 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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sigaction(), SIGTERM, sigaction,

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sig_atomic_t */

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#ifdef __linux__

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

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101

init_gnutls_session(),

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102

GNUTLS_* */

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103

#include <gnutls/openpgp.h>

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* GPGME */

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

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116

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

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117

#define SECKEY "seckey.txt"

128

118

#define PUBKEY "pubkey.txt"

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

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bool debug = false;

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121

static const char mandos_protocol_version[] = "1";

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

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

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

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char *connect_to = NULL;

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const char *hookdir = HOOKDIR;

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

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typedef struct server{

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const char *ip;

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uint16_t port;

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AvahiIfIndex if_index;

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int af;

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struct timespec last_seen;

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struct server *next;

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struct server *prev;

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} server;

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

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

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126

typedef struct {

156

131

gnutls_dh_params_t dh_params;

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132

const char *priority;

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133

gpgme_ctx_t ctx;

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server *current_server;

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134

} mandos_context;

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135

162

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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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.dh_bits = 1024, .priority = "SECURE256"

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

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.current_server = NULL };

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168

sig_atomic_t quit_now = 0;

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int signal_received = 0;

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/* Function to use when printing errors */

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void perror_plus(const char *print_text){

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

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program_invocation_short_name);

175

perror(print_text);

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}

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

179

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

180

va_list ap;

181

va_start (ap, format);

182

183

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

184

program_invocation_short_name));

185

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

186

}

139

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

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140

188

141

/*

189

142

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

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* "buffer_length" is how much is already used.

192

145

*/

193

146

size_t incbuffer(char **buffer, size_t buffer_length,

194

size_t buffer_capacity){

147

size_t buffer_capacity){

195

148

if(buffer_length + BUFFER_SIZE > buffer_capacity){

196

149

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

197

150

if(buffer == NULL){

202

155

return buffer_capacity;

203

156

}

204

157

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

206

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

207

int af){

208

int ret;

209

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

210

if(new_server == NULL){

211

perror_plus("malloc");

212

return false;

213

}

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

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.port = port,

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.if_index = if_index,

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.af = af };

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if(new_server->ip == NULL){

219

perror_plus("strdup");

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return false;

221

}

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/* Special case of first server */

223

if (mc.current_server == NULL){

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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 */

228

} else {

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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;

233

}

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

235

if(ret == -1){

236

perror_plus("clock_gettime");

237

return false;

238

}

239

return true;

240

}

241

242

158

/*

243

159

* Initialize GPGME.

244

160

*/

245

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

246

const char *tempdir){

161

static bool init_gpgme(const char *seckey,

162

const char *pubkey, const char *tempdir){

163

int ret;

247

164

gpgme_error_t rc;

248

165

gpgme_engine_info_t engine_info;

249

166

252

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

253

170

*/

254

171

bool import_key(const char *filename){

255

int ret;

256

172

int fd;

257

173

gpgme_data_t pgp_data;

258

174

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

260

176

if(fd == -1){

261

perror_plus("open");

177

perror("open");

262

178

return false;

263

179

}

264

180

265

181

rc = gpgme_data_new_from_fd(&pgp_data, fd);

266

182

if(rc != GPG_ERR_NO_ERROR){

267

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

269

185

return false;

270

186

}

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rc = gpgme_op_import(mc.ctx, pgp_data);

273

189

if(rc != GPG_ERR_NO_ERROR){

274

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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192

return false;

277

193

}

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

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196

if(ret == -1){

281

perror_plus("close");

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perror("close");

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}

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gpgme_data_release(pgp_data);

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return true;

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201

}

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if(debug){

288

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

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fprintf(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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210

if(rc != GPG_ERR_NO_ERROR){

295

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

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gpgme_strsource(rc), gpgme_strerror(rc));

211

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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213

return false;

298

214

}

299

215

300

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

216

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

301

217

rc = gpgme_get_engine_info(&engine_info);

302

218

if(rc != GPG_ERR_NO_ERROR){

303

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

304

gpgme_strsource(rc), gpgme_strerror(rc));

219

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

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gpgme_strsource(rc), gpgme_strerror(rc));

305

221

return false;

306

222

}

307

223

while(engine_info != NULL){

313

229

engine_info = engine_info->next;

314

230

}

315

231

if(engine_info == NULL){

316

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

317

tempdir);

232

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

318

233

return false;

319

234

}

320

235

321

236

/* Create new GPGME "context" */

322

237

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

323

238

if(rc != GPG_ERR_NO_ERROR){

324

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

325

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

326

gpgme_strerror(rc));

239

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

240

gpgme_strsource(rc), gpgme_strerror(rc));

327

241

return false;

328

242

}

329

243

331

245

return false;

332

246

}

333

247

334

return true;

248

return true;

335

249

}

336

250

337

251

/*

348

262

ssize_t plaintext_length = 0;

349

263

350

264

if(debug){

351

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

265

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

352

266

}

353

267

354

268

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

355

269

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

356

270

0);

357

271

if(rc != GPG_ERR_NO_ERROR){

358

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

359

gpgme_strsource(rc), gpgme_strerror(rc));

272

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

273

gpgme_strsource(rc), gpgme_strerror(rc));

360

274

return -1;

361

275

}

362

276

363

277

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

364

278

rc = gpgme_data_new(&dh_plain);

365

279

if(rc != GPG_ERR_NO_ERROR){

366

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

367

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

368

gpgme_strsource(rc), gpgme_strerror(rc));

280

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

281

gpgme_strsource(rc), gpgme_strerror(rc));

369

282

gpgme_data_release(dh_crypto);

370

283

return -1;

371

284

}

374

287

data buffer */

375

288

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

376

289

if(rc != GPG_ERR_NO_ERROR){

377

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

378

gpgme_strsource(rc), gpgme_strerror(rc));

290

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

291

gpgme_strsource(rc), gpgme_strerror(rc));

379

292

plaintext_length = -1;

380

293

if(debug){

381

294

gpgme_decrypt_result_t result;

382

295

result = gpgme_op_decrypt_result(mc.ctx);

383

296

if(result == NULL){

384

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

297

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

385

298

} else {

386

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

387

result->unsupported_algorithm);

388

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

389

result->wrong_key_usage);

299

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

300

result->unsupported_algorithm);

301

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

302

result->wrong_key_usage);

390

303

if(result->file_name != NULL){

391

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

304

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

392

305

}

393

306

gpgme_recipient_t recipient;

394

307

recipient = result->recipients;

395

while(recipient != NULL){

396

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

397

gpgme_pubkey_algo_name

398

(recipient->pubkey_algo));

399

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

400

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

401

recipient->status == GPG_ERR_NO_SECKEY

402

? "No" : "Yes");

403

recipient = recipient->next;

308

if(recipient){

309

while(recipient != NULL){

310

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

311

gpgme_pubkey_algo_name(recipient->pubkey_algo));

312

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

313

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

314

recipient->status == GPG_ERR_NO_SECKEY

315

? "No" : "Yes");

316

recipient = recipient->next;

317

}

404

318

}

405

319

}

406

320

}

408

322

}

409

323

410

324

if(debug){

411

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

325

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

412

326

}

413

327

414

328

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

415

329

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

416

perror_plus("gpgme_data_seek");

330

perror("gpgme_data_seek");

417

331

plaintext_length = -1;

418

332

goto decrypt_end;

419

333

}

421

335

*plaintext = NULL;

422

336

while(true){

423

337

plaintext_capacity = incbuffer(plaintext,

424

(size_t)plaintext_length,

425

plaintext_capacity);

338

(size_t)plaintext_length,

339

plaintext_capacity);

426

340

if(plaintext_capacity == 0){

427

perror_plus("incbuffer");

428

plaintext_length = -1;

429

goto decrypt_end;

341

perror("incbuffer");

342

plaintext_length = -1;

343

goto decrypt_end;

430

344

}

431

345

432

346

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

437

351

break;

438

352

}

439

353

if(ret < 0){

440

perror_plus("gpgme_data_read");

354

perror("gpgme_data_read");

441

355

plaintext_length = -1;

442

356

goto decrypt_end;

443

357

}

445

359

}

446

360

447

361

if(debug){

448

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

362

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

449

363

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

450

364

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

451

365

}

473

387

/* GnuTLS log function callback */

474

388

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

475

389

const char* string){

476

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

390

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

477

391

}

478

392

479

393

static int init_gnutls_global(const char *pubkeyfilename,

481

395

int ret;

482

396

483

397

if(debug){

484

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

398

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

485

399

}

486

400

487

401

ret = gnutls_global_init();

488

402

if(ret != GNUTLS_E_SUCCESS){

489

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

490

safer_gnutls_strerror(ret));

403

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

404

safer_gnutls_strerror(ret));

491

405

return -1;

492

406

}

493

407

500

414

}

501

415

502

416

/* OpenPGP credentials */

503

ret = gnutls_certificate_allocate_credentials(&mc.cred);

417

gnutls_certificate_allocate_credentials(&mc.cred);

504

418

if(ret != GNUTLS_E_SUCCESS){

505

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

506

safer_gnutls_strerror(ret));

419

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

420

from

421

-Wunreachable-code

422

*/

423

safer_gnutls_strerror(ret));

507

424

gnutls_global_deinit();

508

425

return -1;

509

426

}

510

427

511

428

if(debug){

512

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

513

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

514

pubkeyfilename,

515

seckeyfilename);

429

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

430

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

431

seckeyfilename);

516

432

}

517

433

518

434

ret = gnutls_certificate_set_openpgp_key_file

519

435

(mc.cred, pubkeyfilename, seckeyfilename,

520

436

GNUTLS_OPENPGP_FMT_BASE64);

521

437

if(ret != GNUTLS_E_SUCCESS){

522

fprintf_plus(stderr,

523

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

524

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

525

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

526

safer_gnutls_strerror(ret));

438

fprintf(stderr,

439

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

440

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

441

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

442

safer_gnutls_strerror(ret));

527

443

goto globalfail;

528

444

}

529

445

530

446

/* GnuTLS server initialization */

531

447

ret = gnutls_dh_params_init(&mc.dh_params);

532

448

if(ret != GNUTLS_E_SUCCESS){

533

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

534

" initialization: %s\n",

535

safer_gnutls_strerror(ret));

449

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

450

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

536

451

goto globalfail;

537

452

}

538

453

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

539

454

if(ret != GNUTLS_E_SUCCESS){

540

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

541

safer_gnutls_strerror(ret));

455

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

456

safer_gnutls_strerror(ret));

542

457

goto globalfail;

543

458

}

544

459

557

472

static int init_gnutls_session(gnutls_session_t *session){

558

473

int ret;

559

474

/* GnuTLS session creation */

560

do {

561

ret = gnutls_init(session, GNUTLS_SERVER);

562

if(quit_now){

563

return -1;

564

}

565

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

475

ret = gnutls_init(session, GNUTLS_SERVER);

566

476

if(ret != GNUTLS_E_SUCCESS){

567

fprintf_plus(stderr,

568

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

569

safer_gnutls_strerror(ret));

477

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

478

safer_gnutls_strerror(ret));

570

479

}

571

480

572

481

{

573

482

const char *err;

574

do {

575

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

576

if(quit_now){

577

gnutls_deinit(*session);

578

return -1;

579

}

580

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

483

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

581

484

if(ret != GNUTLS_E_SUCCESS){

582

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

583

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

584

safer_gnutls_strerror(ret));

485

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

486

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

487

safer_gnutls_strerror(ret));

585

488

gnutls_deinit(*session);

586

489

return -1;

587

490

}

588

491

}

589

492

590

do {

591

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

592

mc.cred);

593

if(quit_now){

594

gnutls_deinit(*session);

595

return -1;

596

}

597

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

493

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

494

mc.cred);

598

495

if(ret != GNUTLS_E_SUCCESS){

599

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

600

safer_gnutls_strerror(ret));

496

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

497

safer_gnutls_strerror(ret));

601

498

gnutls_deinit(*session);

602

499

return -1;

603

500

}

604

501

605

502

/* ignore client certificate if any. */

606

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

503

gnutls_certificate_server_set_request(*session,

504

GNUTLS_CERT_IGNORE);

607

505

608

506

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

609

507

618

516

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

619

517

AvahiIfIndex if_index,

620

518

int af){

621

int ret, tcp_sd = -1;

519

int ret, tcp_sd;

622

520

ssize_t sret;

623

521

union {

624

522

struct sockaddr_in in;

625

523

struct sockaddr_in6 in6;

626

524

} to;

627

525

char *buffer = NULL;

628

char *decrypted_buffer = NULL;

526

char *decrypted_buffer;

629

527

size_t buffer_length = 0;

630

528

size_t buffer_capacity = 0;

529

ssize_t decrypted_buffer_size;

631

530

size_t written;

632

int retval = -1;

531

int retval = 0;

633

532

gnutls_session_t session;

634

533

int pf; /* Protocol family */

635

534

636

errno = 0;

637

638

if(quit_now){

639

errno = EINTR;

640

return -1;

641

}

642

643

535

switch(af){

644

536

case AF_INET6:

645

537

pf = PF_INET6;

648

540

pf = PF_INET;

649

541

break;

650

542

default:

651

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

652

errno = EINVAL;

543

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

653

544

return -1;

654

545

}

655

546

659

550

}

660

551

661

552

if(debug){

662

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

663

PRIu16 "\n", ip, port);

553

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

554

"\n", ip, port);

664

555

}

665

556

666

557

tcp_sd = socket(pf, SOCK_STREAM, 0);

667

558

if(tcp_sd < 0){

668

int e = errno;

669

perror_plus("socket");

670

errno = e;

671

goto mandos_end;

672

}

673

674

if(quit_now){

675

errno = EINTR;

676

goto mandos_end;

559

perror("socket");

560

return -1;

677

561

}

678

562

679

563

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

680

564

if(af == AF_INET6){

681

to.in6.sin6_family = (sa_family_t)af;

565

to.in6.sin6_family = (uint16_t)af;

682

566

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

683

567

} else { /* IPv4 */

684

568

to.in.sin_family = (sa_family_t)af;

685

569

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

686

570

}

687

571

if(ret < 0 ){

688

int e = errno;

689

perror_plus("inet_pton");

690

errno = e;

691

goto mandos_end;

572

perror("inet_pton");

573

return -1;

692

574

}

693

575

if(ret == 0){

694

int e = errno;

695

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

696

errno = e;

697

goto mandos_end;

576

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

577

return -1;

698

578

}

699

579

if(af == AF_INET6){

700

580

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

703

583

704

584

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

705

585

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

706

-Wunreachable-code*/

586

-Wunreachable-code*/

707

587

if(if_index == AVAHI_IF_UNSPEC){

708

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

709

" incomplete without a network interface\n");

710

errno = EINVAL;

711

goto mandos_end;

588

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

589

" without a network interface\n");

590

return -1;

712

591

}

713

592

/* Set the network interface number as scope */

714

593

to.in6.sin6_scope_id = (uint32_t)if_index;

719

598

-Wunreachable-code */

720

599

}

721

600

722

if(quit_now){

723

errno = EINTR;

724

goto mandos_end;

725

}

726

727

601

if(debug){

728

602

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

729

603

char interface[IF_NAMESIZE];

730

604

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

731

perror_plus("if_indextoname");

605

perror("if_indextoname");

732

606

} else {

733

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

734

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

607

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

608

ip, interface, port);

735

609

}

736

610

} else {

737

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

738

ip, port);

611

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

612

port);

739

613

}

740

614

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

741

615

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

748

622

sizeof(addrstr));

749

623

}

750

624

if(pcret == NULL){

751

perror_plus("inet_ntop");

625

perror("inet_ntop");

752

626

} else {

753

627

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

754

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

628

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

755

629

}

756

630

}

757

631

}

758

632

759

if(quit_now){

760

errno = EINTR;

761

goto mandos_end;

762

}

763

764

633

if(af == AF_INET6){

765

634

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

766

635

} else {

767

636

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

768

637

}

769

638

if(ret < 0){

770

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

771

int e = errno;

772

perror_plus("connect");

773

errno = e;

774

}

775

goto mandos_end;

776

}

777

778

if(quit_now){

779

errno = EINTR;

780

goto mandos_end;

639

perror("connect");

640

return -1;

781

641

}

782

642

783

643

const char *out = mandos_protocol_version;

785

645

while(true){

786

646

size_t out_size = strlen(out);

787

647

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

788

out_size - written));

648

out_size - written));

789

649

if(ret == -1){

790

int e = errno;

791

perror_plus("write");

792

errno = e;

650

perror("write");

651

retval = -1;

793

652

goto mandos_end;

794

653

}

795

654

written += (size_t)ret;

803

662

break;

804

663

}

805

664

}

806

807

if(quit_now){

808

errno = EINTR;

809

goto mandos_end;

810

}

811

665

}

812

666

813

667

if(debug){

814

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

815

}

816

817

if(quit_now){

818

errno = EINTR;

819

goto mandos_end;

820

}

821

822

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

668

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

669

}

670

823

671

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

824

672

825

if(quit_now){

826

errno = EINTR;

827

goto mandos_end;

828

}

829

830

do {

673

do{

831

674

ret = gnutls_handshake(session);

832

if(quit_now){

833

errno = EINTR;

834

goto mandos_end;

835

}

836

675

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

837

676

838

677

if(ret != GNUTLS_E_SUCCESS){

839

678

if(debug){

840

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

679

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

841

680

gnutls_perror(ret);

842

681

}

843

errno = EPROTO;

682

retval = -1;

844

683

goto mandos_end;

845

684

}

846

685

847

686

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

848

687

849

688

if(debug){

850

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

851

" %s\n", ip);

689

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

690

ip);

852

691

}

853

692

854

693

while(true){

855

856

if(quit_now){

857

errno = EINTR;

858

goto mandos_end;

859

}

860

861

694

buffer_capacity = incbuffer(&buffer, buffer_length,

862

buffer_capacity);

695

buffer_capacity);

863

696

if(buffer_capacity == 0){

864

int e = errno;

865

perror_plus("incbuffer");

866

errno = e;

867

goto mandos_end;

868

}

869

870

if(quit_now){

871

errno = EINTR;

697

perror("incbuffer");

698

retval = -1;

872

699

goto mandos_end;

873

700

}

874

701

883

710

case GNUTLS_E_AGAIN:

884

711

break;

885

712

case GNUTLS_E_REHANDSHAKE:

886

do {

713

do{

887

714

ret = gnutls_handshake(session);

888

889

if(quit_now){

890

errno = EINTR;

891

goto mandos_end;

892

}

893

715

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

894

716

if(ret < 0){

895

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

896

"***\n");

717

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

897

718

gnutls_perror(ret);

898

errno = EPROTO;

719

retval = -1;

899

720

goto mandos_end;

900

721

}

901

722

break;

902

723

default:

903

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

904

" encrypted session with Mandos server\n");

724

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

725

" encrypted session with Mandos server\n");

726

retval = -1;

905

727

gnutls_bye(session, GNUTLS_SHUT_RDWR);

906

errno = EIO;

907

728

goto mandos_end;

908

729

}

909

730

} else {

912

733

}

913

734

914

735

if(debug){

915

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

916

}

917

918

if(quit_now){

919

errno = EINTR;

920

goto mandos_end;

921

}

922

923

do {

924

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

925

if(quit_now){

926

errno = EINTR;

927

goto mandos_end;

928

}

929

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

736

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

737

}

738

739

gnutls_bye(session, GNUTLS_SHUT_RDWR);

930

740

931

741

if(buffer_length > 0){

932

ssize_t decrypted_buffer_size;

933

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

742

decrypted_buffer_size = pgp_packet_decrypt(buffer,

743

buffer_length,

934

744

&decrypted_buffer);

935

745

if(decrypted_buffer_size >= 0){

936

937

746

written = 0;

938

747

while(written < (size_t) decrypted_buffer_size){

939

if(quit_now){

940

errno = EINTR;

941

goto mandos_end;

942

}

943

944

748

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

945

749

(size_t)decrypted_buffer_size - written,

946

750

stdout);

947

751

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

948

int e = errno;

949

752

if(debug){

950

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

951

strerror(errno));

753

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

754

strerror(errno));

952

755

}

953

errno = e;

954

goto mandos_end;

756

retval = -1;

757

break;

955

758

}

956

759

written += (size_t)ret;

957

760

}

958

retval = 0;

761

free(decrypted_buffer);

762

} else {

763

retval = -1;

959

764

}

765

} else {

766

retval = -1;

960

767

}

961

768

962

769

/* Shutdown procedure */

963

770

964

771

mandos_end:

965

{

966

int e = errno;

967

free(decrypted_buffer);

968

free(buffer);

969

if(tcp_sd >= 0){

970

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

971

}

972

if(ret == -1){

973

if(e == 0){

974

e = errno;

975

}

976

perror_plus("close");

977

}

978

gnutls_deinit(session);

979

errno = e;

980

if(quit_now){

981

errno = EINTR;

982

retval = -1;

983

}

772

free(buffer);

773

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

774

if(ret == -1){

775

perror("close");

984

776

}

777

gnutls_deinit(session);

985

778

return retval;

986

779

}

987

780

1004

797

/* Called whenever a service has been resolved successfully or

1005

798

timed out */

1006

799

1007

if(quit_now){

1008

return;

1009

}

1010

1011

800

switch(event){

1012

801

default:

1013

802

case AVAHI_RESOLVER_FAILURE:

1014

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

1015

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

1016

domain,

1017

avahi_strerror(avahi_server_errno(mc.server)));

803

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

804

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

805

avahi_strerror(avahi_server_errno(mc.server)));

1018

806

break;

1019

807

1020

808

case AVAHI_RESOLVER_FOUND:

1022

810

char ip[AVAHI_ADDRESS_STR_MAX];

1023

811

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

1024

812

if(debug){

1025

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

1026

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

1027

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

813

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

814

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

815

ip, (intmax_t)interface, port);

1028

816

}

1029

817

int ret = start_mandos_communication(ip, port, interface,

1030

818

avahi_proto_to_af(proto));

1031

819

if(ret == 0){

1032

820

avahi_simple_poll_quit(mc.simple_poll);

1033

} else {

1034

if(not add_server(ip, port, interface,

1035

avahi_proto_to_af(proto))){

1036

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

1037

" list\n", name);

1038

}

1039

821

}

1040

822

}

1041

823

}

1057

839

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

1058

840

is removed from the LAN */

1059

841

1060

if(quit_now){

1061

return;

1062

}

1063

1064

842

switch(event){

1065

843

default:

1066

844

case AVAHI_BROWSER_FAILURE:

1067

845

1068

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

1069

avahi_strerror(avahi_server_errno(mc.server)));

846

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

847

avahi_strerror(avahi_server_errno(mc.server)));

1070

848

avahi_simple_poll_quit(mc.simple_poll);

1071

849

return;

1072

850

1079

857

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

1080

858

name, type, domain, protocol, 0,

1081

859

resolve_callback, NULL) == NULL)

1082

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

1083

" %s\n", name,

1084

avahi_strerror(avahi_server_errno(mc.server)));

860

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

861

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

1085

862

break;

1086

863

1087

864

case AVAHI_BROWSER_REMOVE:

1090

867

case AVAHI_BROWSER_ALL_FOR_NOW:

1091

868

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1092

869

if(debug){

1093

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

1094

" searching...\n");

870

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

1095

871

}

1096

872

break;

1097

873

}

1098

874

}

1099

875

1100

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

1101

static void handle_sigterm(int sig){

876

sig_atomic_t quit_now = 0;

877

878

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

879

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

1102

880

if(quit_now){

1103

881

return;

1104

882

}

1105

883

quit_now = 1;

1106

signal_received = sig;

1107

884

int old_errno = errno;

1108

/* set main loop to exit */

1109

885

if(mc.simple_poll != NULL){

1110

886

avahi_simple_poll_quit(mc.simple_poll);

1111

887

}

1112

888

errno = old_errno;

1113

889

}

1114

890

1115

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

1116

int ret;

1117

1118

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

1119

if(s < 0){

1120

perror_plus("socket");

1121

return false;

1122

}

1123

strcpy(ifr->ifr_name, ifname);

1124

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1125

if(ret == -1){

1126

if(debug){

1127

perror_plus("ioctl SIOCGIFFLAGS");

1128

}

1129

return false;

1130

}

1131

return true;

1132

}

1133

1134

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

1135

1136

/* Reject the loopback device */

1137

if(ifr->ifr_flags & IFF_LOOPBACK){

1138

if(debug){

1139

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

1140

ifname);

1141

}

1142

return false;

1143

}

1144

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

1145

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

1146

if(debug){

1147

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

1148

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

1149

}

1150

return true;

1151

}

1152

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

1153

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

1154

if(debug){

1155

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1156

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

1157

}

1158

return false;

1159

}

1160

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

1161

if(ifr->ifr_flags & IFF_NOARP){

1162

if(debug){

1163

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

1164

ifname);

1165

}

1166

return false;

1167

}

1168

1169

/* Accept this device */

1170

if(debug){

1171

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

1172

}

1173

return true;

1174

}

1175

1176

/*

1177

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

1178

* corresponds to an acceptable network device.

1179

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

1180

*/

1181

int good_interface(const struct dirent *if_entry){

1182

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

1183

return 0;

1184

}

1185

1186

struct ifreq ifr;

1187

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

1188

if(debug){

1189

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

1190

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

1191

}

1192

return 0;

1193

}

1194

1195

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

1196

return 0;

1197

}

1198

return 1;

1199

}

1200

1201

/*

1202

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

1203

* corresponds to an acceptable network device which is up.

1204

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

1205

*/

1206

int up_interface(const struct dirent *if_entry){

1207

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

1208

return 0;

1209

}

1210

1211

struct ifreq ifr;

1212

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

1213

if(debug){

1214

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

1215

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

1216

}

1217

return 0;

1218

}

1219

1220

/* Reject down interfaces */

1221

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

1222

if(debug){

1223

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

1224

if_entry->d_name);

1225

}

1226

return 0;

1227

}

1228

1229

/* Reject non-running interfaces */

1230

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

1231

if(debug){

1232

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

1233

if_entry->d_name);

1234

}

1235

return 0;

1236

}

1237

1238

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

1239

return 0;

1240

}

1241

return 1;

1242

}

1243

1244

int notdotentries(const struct dirent *direntry){

1245

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

1246

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

1247

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

1248

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

1249

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

1250

return 0;

1251

}

1252

return 1;

1253

}

1254

1255

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

1256

int runnable_hook(const struct dirent *direntry){

1257

int ret;

1258

size_t sret;

1259

struct stat st;

1260

1261

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

1262

/* Empty name? */

1263

return 0;

1264

}

1265

1266

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

1267

"abcdefghijklmnopqrstuvwxyz"

1268

"0123456789"

1269

"_-");

1270

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

1271

/* Contains non-allowed characters */

1272

if(debug){

1273

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

1274

direntry->d_name);

1275

}

1276

return 0;

1277

}

1278

1279

char *fullname = NULL;

1280

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

1281

if(ret < 0){

1282

perror_plus("asprintf");

1283

return 0;

1284

}

1285

1286

ret = stat(fullname, &st);

1287

if(ret == -1){

1288

if(debug){

1289

perror_plus("Could not stat hook");

1290

}

1291

return 0;

1292

}

1293

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

1294

/* Not a regular file */

1295

if(debug){

1296

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

1297

direntry->d_name);

1298

}

1299

return 0;

1300

}

1301

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

1302

/* Not executable */

1303

if(debug){

1304

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

1305

direntry->d_name);

1306

}

1307

return 0;

1308

}

1309

if(debug){

1310

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

1311

direntry->d_name);

1312

}

1313

return 1;

1314

}

1315

1316

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1317

int ret;

1318

struct timespec now;

1319

struct timespec waited_time;

1320

intmax_t block_time;

1321

1322

while(true){

1323

if(mc.current_server == NULL){

1324

if (debug){

1325

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

1326

" No timeout!\n");

1327

}

1328

ret = avahi_simple_poll_iterate(s, -1);

1329

} else {

1330

if (debug){

1331

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

1332

" it, or wait\n");

1333

}

1334

/* the current time */

1335

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1336

if(ret == -1){

1337

perror_plus("clock_gettime");

1338

return -1;

1339

}

1340

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

1341

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

1342

waited_time.tv_sec = (now.tv_sec

1343

- mc.current_server->last_seen.tv_sec);

1344

waited_time.tv_nsec = (now.tv_nsec

1345

- mc.current_server->last_seen.tv_nsec);

1346

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

1347

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

1348

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

1349

block_time = ((retry_interval

1350

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

1351

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

1352

1353

if (debug){

1354

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

1355

block_time);

1356

}

1357

1358

if(block_time <= 0){

1359

ret = start_mandos_communication(mc.current_server->ip,

1360

mc.current_server->port,

1361

mc.current_server->if_index,

1362

mc.current_server->af);

1363

if(ret == 0){

1364

avahi_simple_poll_quit(mc.simple_poll);

1365

return 0;

1366

}

1367

ret = clock_gettime(CLOCK_MONOTONIC,

1368

&mc.current_server->last_seen);

1369

if(ret == -1){

1370

perror_plus("clock_gettime");

1371

return -1;

1372

}

1373

mc.current_server = mc.current_server->next;

1374

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

1375

servers, but don't block */

1376

}

1377

1378

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

1379

}

1380

if(ret != 0){

1381

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

1382

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

1383

}

1384

}

1385

}

1386

}

1387

1388

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

1389

const float delay){

1390

struct dirent **direntries;

1391

struct dirent *direntry;

1392

int ret;

1393

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

1394

alphasort);

1395

if(numhooks == -1){

1396

perror_plus("scandir");

1397

} else {

1398

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

1399

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

1400

direntry = direntries[i];

1401

char *fullname = NULL;

1402

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

1403

if(ret < 0){

1404

perror_plus("asprintf");

1405

continue;

1406

}

1407

if(debug){

1408

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

1409

direntry->d_name);

1410

}

1411

pid_t hook_pid = fork();

1412

if(hook_pid == 0){

1413

/* Child */

1414

/* Raise privileges */

1415

errno = 0;

1416

ret = seteuid(0);

1417

if(ret == -1){

1418

perror_plus("seteuid");

1419

}

1420

/* Raise privileges even more */

1421

errno = 0;

1422

ret = setuid(0);

1423

if(ret == -1){

1424

perror_plus("setuid");

1425

}

1426

/* Set group */

1427

errno = 0;

1428

ret = setgid(0);

1429

if(ret == -1){

1430

perror_plus("setgid");

1431

}

1432

/* Reset supplementary groups */

1433

errno = 0;

1434

ret = setgroups(0, NULL);

1435

if(ret == -1){

1436

perror_plus("setgroups");

1437

}

1438

dup2(devnull, STDIN_FILENO);

1439

close(devnull);

1440

dup2(STDERR_FILENO, STDOUT_FILENO);

1441

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

1442

if(ret == -1){

1443

perror_plus("setenv");

1444

_exit(EX_OSERR);

1445

}

1446

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

1447

if(ret == -1){

1448

perror_plus("setenv");

1449

_exit(EX_OSERR);

1450

}

1451

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

1452

if(ret == -1){

1453

perror_plus("setenv");

1454

_exit(EX_OSERR);

1455

}

1456

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

1457

if(ret == -1){

1458

perror_plus("setenv");

1459

_exit(EX_OSERR);

1460

}

1461

char *delaystring;

1462

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

1463

if(ret == -1){

1464

perror_plus("asprintf");

1465

_exit(EX_OSERR);

1466

}

1467

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

1468

if(ret == -1){

1469

free(delaystring);

1470

perror_plus("setenv");

1471

_exit(EX_OSERR);

1472

}

1473

free(delaystring);

1474

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

1475

perror_plus("execl");

1476

_exit(EXIT_FAILURE);

1477

}

1478

} else {

1479

int status;

1480

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

1481

perror_plus("waitpid");

1482

free(fullname);

1483

continue;

1484

}

1485

if(WIFEXITED(status)){

1486

if(WEXITSTATUS(status) != 0){

1487

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

1488

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

1489

WEXITSTATUS(status));

1490

free(fullname);

1491

continue;

1492

}

1493

} else if(WIFSIGNALED(status)){

1494

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

1495

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

1496

WTERMSIG(status));

1497

free(fullname);

1498

continue;

1499

} else {

1500

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

1501

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

1502

free(fullname);

1503

continue;

1504

}

1505

}

1506

free(fullname);

1507

if(debug){

1508

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

1509

direntry->d_name);

1510

}

1511

}

1512

close(devnull);

1513

}

1514

return true;

1515

}

1516

1517

891

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

1518

892

AvahiSServiceBrowser *sb = NULL;

1519

893

int error;

1521

895

intmax_t tmpmax;

1522

896

char *tmp;

1523

897

int exitcode = EXIT_SUCCESS;

1524

const char *interface = "";

898

const char *interface = "eth0";

1525

899

struct ifreq network;

1526

int sd = -1;

1527

bool take_down_interface = false;

900

int sd;

1528

901

uid_t uid;

1529

902

gid_t gid;

903

char *connect_to = NULL;

1530

904

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

1531

905

bool tempdir_created = false;

1532

906

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1536

910

bool gnutls_initialized = false;

1537

911

bool gpgme_initialized = false;

1538

912

float delay = 2.5f;

1539

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

1540

retrying the same server again */

1541

913

1542

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

914

struct sigaction old_sigterm_action;

1543

915

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1544

916

1545

uid = getuid();

1546

gid = getgid();

1547

1548

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

1549

errno = 0;

1550

ret = setgid(gid);

1551

if(ret == -1){

1552

perror_plus("setgid");

1553

}

1554

1555

/* Lower user privileges (temporarily) */

1556

errno = 0;

1557

ret = seteuid(uid);

1558

if(ret == -1){

1559

perror_plus("seteuid");

1560

}

1561

1562

if(quit_now){

1563

goto end;

1564

}

1565

1566

917

{

1567

918

struct argp_option options[] = {

1568

919

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

1597

948

.arg = "SECONDS",

1598

949

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

1599

950

.group = 2 },

1600

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

1601

.arg = "SECONDS",

1602

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

1603

.group = 2 },

1604

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

1605

.arg = "DIR",

1606

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

1607

.group = 2 },

1608

/*

1609

* These reproduce what we would get without ARGP_NO_HELP

1610

*/

1611

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

1612

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

1613

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

1614

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

1615

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

1616

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

1617

951

{ .name = NULL }

1618

952

};

1619

953

1620

954

error_t parse_opt(int key, char *arg,

1621

955

struct argp_state *state){

1622

errno = 0;

1623

956

switch(key){

1624

957

case 128: /* --debug */

1625

958

debug = true;

1641

974

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

1642

975

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

1643

976

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

1644

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

977

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

978

exit(EXIT_FAILURE);

1645

979

}

1646

980

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

1647

981

break;

1652

986

errno = 0;

1653

987

delay = strtof(arg, &tmp);

1654

988

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

1655

argp_error(state, "Bad delay");

1656

}

1657

case 132: /* --retry */

1658

errno = 0;

1659

retry_interval = strtod(arg, &tmp);

1660

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

1661

or (retry_interval * 1000) > INT_MAX

1662

or retry_interval < 0){

1663

argp_error(state, "Bad retry interval");

1664

}

1665

break;

1666

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

1667

hookdir = arg;

1668

break;

1669

/*

1670

* These reproduce what we would get without ARGP_NO_HELP

1671

*/

1672

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

1673

argp_state_help(state, state->out_stream,

1674

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1675

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1676

case -3: /* --usage */

1677

argp_state_help(state, state->out_stream,

1678

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1679

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

1680

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

1681

exit(argp_err_exit_status);

989

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

990

exit(EXIT_FAILURE);

991

}

992

break;

993

case ARGP_KEY_ARG:

994

argp_usage(state);

995

case ARGP_KEY_END:

1682

996

break;

1683

997

default:

1684

998

return ARGP_ERR_UNKNOWN;

1685

999

}

1686

return errno;

1000

return 0;

1687

1001

}

1688

1002

1689

1003

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

1690

1004

.args_doc = "",

1691

1005

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

1692

1006

" passwords from a Mandos server" };

1693

ret = argp_parse(&argp, argc, argv,

1694

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1695

switch(ret){

1696

case 0:

1697

break;

1698

case ENOMEM:

1699

default:

1700

errno = ret;

1701

perror_plus("argp_parse");

1702

exitcode = EX_OSERR;

1703

goto end;

1704

case EINVAL:

1705

exitcode = EX_USAGE;

1706

goto end;

1707

}

1708

}

1709

1710

{

1711

/* Work around Debian bug #633582:

1712

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

1713

1714

/* Re-raise priviliges */

1715

errno = 0;

1716

ret = seteuid(0);

1717

if(ret == -1){

1718

perror_plus("seteuid");

1719

} else {

1720

struct stat st;

1721

1722

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

1723

int seckey_fd = open(seckey, O_RDONLY);

1724

if(seckey_fd == -1){

1725

perror_plus("open");

1726

} else {

1727

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

1728

if(ret == -1){

1729

perror_plus("fstat");

1730

} else {

1731

if(S_ISREG(st.st_mode)

1732

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

1733

ret = fchown(seckey_fd, uid, gid);

1734

if(ret == -1){

1735

perror_plus("fchown");

1736

}

1737

}

1738

}

1739

TEMP_FAILURE_RETRY(close(seckey_fd));

1740

}

1741

}

1742

1743

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

1744

int pubkey_fd = open(pubkey, O_RDONLY);

1745

if(pubkey_fd == -1){

1746

perror_plus("open");

1747

} else {

1748

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

1749

if(ret == -1){

1750

perror_plus("fstat");

1751

} else {

1752

if(S_ISREG(st.st_mode)

1753

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

1754

ret = fchown(pubkey_fd, uid, gid);

1755

if(ret == -1){

1756

perror_plus("fchown");

1757

}

1758

}

1759

}

1760

TEMP_FAILURE_RETRY(close(pubkey_fd));

1761

}

1762

}

1763

1764

/* Lower privileges */

1765

errno = 0;

1766

ret = seteuid(uid);

1767

if(ret == -1){

1768

perror_plus("seteuid");

1769

}

1770

}

1771

}

1772

1773

/* Run network hooks */

1774

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

1775

goto end;

1007

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

1008

if(ret == ARGP_ERR_UNKNOWN){

1009

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

1010

exitcode = EXIT_FAILURE;

1011

goto end;

1012

}

1776

1013

}

1777

1014

1778

1015

if(not debug){

1779

1016

avahi_set_log_function(empty_log);

1780

1017

}

1781

1018

1782

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

1783

struct dirent **direntries;

1784

/* First look for interfaces that are up */

1785

ret = scandir(sys_class_net, &direntries, up_interface,

1786

alphasort);

1787

if(ret == 0){

1788

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

1789

free(direntries);

1790

ret = scandir(sys_class_net, &direntries, good_interface,

1791

alphasort);

1792

}

1793

if(ret >= 1){

1794

/* Pick the first interface returned */

1795

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

1796

if(debug){

1797

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

1798

}

1799

if(interface == NULL){

1800

perror_plus("malloc");

1801

free(direntries);

1802

exitcode = EXIT_FAILURE;

1803

goto end;

1804

}

1805

free(direntries);

1806

} else {

1807

free(direntries);

1808

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

1809

exitcode = EXIT_FAILURE;

1810

goto end;

1811

}

1812

}

1813

1814

1019

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

1815

1020

from the signal handler */

1816

1021

/* Initialize the pseudo-RNG for Avahi */

1817

1022

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

1818

1023

mc.simple_poll = avahi_simple_poll_new();

1819

1024

if(mc.simple_poll == NULL){

1820

fprintf_plus(stderr,

1821

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

1822

exitcode = EX_UNAVAILABLE;

1025

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

1026

exitcode = EXIT_FAILURE;

1823

1027

goto end;

1824

1028

}

1825

1029

1826

1030

sigemptyset(&sigterm_action.sa_mask);

1827

1031

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

1828

1032

if(ret == -1){

1829

perror_plus("sigaddset");

1830

exitcode = EX_OSERR;

1033

perror("sigaddset");

1034

exitcode = EXIT_FAILURE;

1831

1035

goto end;

1832

1036

}

1833

1037

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

1834

1038

if(ret == -1){

1835

perror_plus("sigaddset");

1836

exitcode = EX_OSERR;

1039

perror("sigaddset");

1040

exitcode = EXIT_FAILURE;

1837

1041

goto end;

1838

1042

}

1839

1043

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

1840

1044

if(ret == -1){

1841

perror_plus("sigaddset");

1842

exitcode = EX_OSERR;

1843

goto end;

1844

}

1845

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

1846

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

1847

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

1848

*/

1849

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

1850

if(ret == -1){

1851

perror_plus("sigaction");

1852

return EX_OSERR;

1853

}

1854

if(old_sigterm_action.sa_handler != SIG_IGN){

1855

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

1856

if(ret == -1){

1857

perror_plus("sigaction");

1858

exitcode = EX_OSERR;

1859

goto end;

1860

}

1861

}

1862

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

1863

if(ret == -1){

1864

perror_plus("sigaction");

1865

return EX_OSERR;

1866

}

1867

if(old_sigterm_action.sa_handler != SIG_IGN){

1868

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

1869

if(ret == -1){

1870

perror_plus("sigaction");

1871

exitcode = EX_OSERR;

1872

goto end;

1873

}

1874

}

1875

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

1876

if(ret == -1){

1877

perror_plus("sigaction");

1878

return EX_OSERR;

1879

}

1880

if(old_sigterm_action.sa_handler != SIG_IGN){

1881

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

1882

if(ret == -1){

1883

perror_plus("sigaction");

1884

exitcode = EX_OSERR;

1885

goto end;

1886

}

1887

}

1045

perror("sigaddset");

1046

exitcode = EXIT_FAILURE;

1047

goto end;

1048

}

1049

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

1050

if(ret == -1){

1051

perror("sigaction");

1052

exitcode = EXIT_FAILURE;

1053

goto end;

1054

}

1888

1055

1889

1056

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

1890

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

1891

if_index = (AvahiIfIndex) if_nametoindex(interface);

1892

if(if_index == 0){

1893

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

1894

exitcode = EX_UNAVAILABLE;

1895

goto end;

1896

}

1897

1898

if(quit_now){

1899

goto end;

1900

}

1901

1902

/* Re-raise priviliges */

1903

errno = 0;

1904

ret = seteuid(0);

1905

if(ret == -1){

1906

perror_plus("seteuid");

1907

}

1908

1057

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

1909

1058

#ifdef __linux__

1910

1059

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1911

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

1060

messages to mess up the prompt */

1912

1061

ret = klogctl(8, NULL, 5);

1913

1062

bool restore_loglevel = true;

1914

1063

if(ret == -1){

1915

1064

restore_loglevel = false;

1916

perror_plus("klogctl");

1065

perror("klogctl");

1917

1066

}

1918

1067

#endif /* __linux__ */

1919

1068

1920

1069

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1921

1070

if(sd < 0){

1922

perror_plus("socket");

1923

exitcode = EX_OSERR;

1071

perror("socket");

1072

exitcode = EXIT_FAILURE;

1924

1073

#ifdef __linux__

1925

1074

if(restore_loglevel){

1926

1075

ret = klogctl(7, NULL, 0);

1927

1076

if(ret == -1){

1928

perror_plus("klogctl");

1077

perror("klogctl");

1929

1078

}

1930

1079

}

1931

1080

#endif /* __linux__ */

1932

/* Lower privileges */

1933

errno = 0;

1934

ret = seteuid(uid);

1935

if(ret == -1){

1936

perror_plus("seteuid");

1937

}

1938

1081

goto end;

1939

1082

}

1940

1083

strcpy(network.ifr_name, interface);

1941

1084

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

1942

1085

if(ret == -1){

1943

perror_plus("ioctl SIOCGIFFLAGS");

1086

perror("ioctl SIOCGIFFLAGS");

1944

1087

#ifdef __linux__

1945

1088

if(restore_loglevel){

1946

1089

ret = klogctl(7, NULL, 0);

1947

1090

if(ret == -1){

1948

perror_plus("klogctl");

1091

perror("klogctl");

1949

1092

}

1950

1093

}

1951

1094

#endif /* __linux__ */

1952

exitcode = EX_OSERR;

1953

/* Lower privileges */

1954

errno = 0;

1955

ret = seteuid(uid);

1956

if(ret == -1){

1957

perror_plus("seteuid");

1958

}

1095

exitcode = EXIT_FAILURE;

1959

1096

goto end;

1960

1097

}

1961

1098

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

1962

1099

network.ifr_flags |= IFF_UP;

1963

take_down_interface = true;

1964

1100

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

1965

1101

if(ret == -1){

1966

take_down_interface = false;

1967

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1968

exitcode = EX_OSERR;

1102

perror("ioctl SIOCSIFFLAGS");

1103

exitcode = EXIT_FAILURE;

1969

1104

#ifdef __linux__

1970

1105

if(restore_loglevel){

1971

1106

ret = klogctl(7, NULL, 0);

1972

1107

if(ret == -1){

1973

perror_plus("klogctl");

1108

perror("klogctl");

1974

1109

}

1975

1110

}

1976

1111

#endif /* __linux__ */

1977

/* Lower privileges */

1978

errno = 0;

1979

ret = seteuid(uid);

1980

if(ret == -1){

1981

perror_plus("seteuid");

1982

}

1983

1112

goto end;

1984

1113

}

1985

1114

}

1986

/* Sleep checking until interface is running.

1987

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

1115

/* sleep checking until interface is running */

1988

1116

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

1989

1117

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

1990

1118

if(ret == -1){

1991

perror_plus("ioctl SIOCGIFFLAGS");

1119

perror("ioctl SIOCGIFFLAGS");

1992

1120

} else if(network.ifr_flags & IFF_RUNNING){

1993

1121

break;

1994

1122

}

1995

1123

struct timespec sleeptime = { .tv_nsec = 250000000 };

1996

1124

ret = nanosleep(&sleeptime, NULL);

1997

1125

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

1998

perror_plus("nanosleep");

1126

perror("nanosleep");

1999

1127

}

2000

1128

}

2001

if(not take_down_interface){

2002

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

2003

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

2004

if(ret == -1){

2005

perror_plus("close");

2006

}

1129

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

1130

if(ret == -1){

1131

perror("close");

2007

1132

}

2008

1133

#ifdef __linux__

2009

1134

if(restore_loglevel){

2010

1135

/* Restores kernel loglevel to default */

2011

1136

ret = klogctl(7, NULL, 0);

2012

1137

if(ret == -1){

2013

perror_plus("klogctl");

1138

perror("klogctl");

2014

1139

}

2015

1140

}

2016

1141

#endif /* __linux__ */

2017

/* Lower privileges */

2018

errno = 0;

2019

/* Lower privileges */

2020

ret = seteuid(uid);

2021

if(ret == -1){

2022

perror_plus("seteuid");

2023

}

2024

}

2025

2026

if(quit_now){

2027

goto end;

1142

}

1143

1144

uid = getuid();

1145

gid = getgid();

1146

1147

errno = 0;

1148

setgid(gid);

1149

if(ret == -1){

1150

perror("setgid");

1151

}

1152

1153

ret = setuid(uid);

1154

if(ret == -1){

1155

perror("setuid");

2028

1156

}

2029

1157

2030

1158

ret = init_gnutls_global(pubkey, seckey);

2031

1159

if(ret == -1){

2032

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

2033

exitcode = EX_UNAVAILABLE;

1160

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

1161

exitcode = EXIT_FAILURE;

2034

1162

goto end;

2035

1163

} else {

2036

1164

gnutls_initialized = true;

2037

1165

}

2038

1166

2039

if(quit_now){

2040

goto end;

2041

}

2042

2043

1167

if(mkdtemp(tempdir) == NULL){

2044

perror_plus("mkdtemp");

1168

perror("mkdtemp");

2045

1169

goto end;

2046

1170

}

2047

1171

tempdir_created = true;

2048

1172

2049

if(quit_now){

2050

goto end;

2051

}

2052

2053

1173

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

2054

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

2055

exitcode = EX_UNAVAILABLE;

1174

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

1175

exitcode = EXIT_FAILURE;

2056

1176

goto end;

2057

1177

} else {

2058

1178

gpgme_initialized = true;

2059

1179

}

2060

1180

2061

if(quit_now){

2062

goto end;

1181

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

1182

if_index = (AvahiIfIndex) if_nametoindex(interface);

1183

if(if_index == 0){

1184

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

1185

exitcode = EXIT_FAILURE;

1186

goto end;

1187

}

2063

1188

}

2064

1189

2065

1190

if(connect_to != NULL){

2067

1192

/* (Mainly meant for debugging) */

2068

1193

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

2069

1194

if(address == NULL){

2070

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

2071

exitcode = EX_USAGE;

2072

goto end;

2073

}

2074

2075

if(quit_now){

2076

goto end;

2077

}

2078

1195

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

1196

exitcode = EXIT_FAILURE;

1197

goto end;

1198

}

2079

1199

uint16_t port;

2080

1200

errno = 0;

2081

1201

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

2082

1202

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

2083

1203

or tmpmax != (uint16_t)tmpmax){

2084

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

2085

exitcode = EX_USAGE;

2086

goto end;

2087

}

2088

2089

if(quit_now){

2090

goto end;

2091

}

2092

1204

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

1205

exitcode = EXIT_FAILURE;

1206

goto end;

1207

}

2093

1208

port = (uint16_t)tmpmax;

2094

1209

*address = '\0';

1210

address = connect_to;

2095

1211

/* Colon in address indicates IPv6 */

2096

1212

int af;

2097

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

1213

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

2098

1214

af = AF_INET6;

2099

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

2100

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

2101

{

2102

connect_to++;

2103

address[-1] = '\0';

2104

}

2105

1215

} else {

2106

1216

af = AF_INET;

2107

1217

}

2108

address = connect_to;

2109

2110

if(quit_now){

2111

goto end;

2112

}

2113

2114

while(not quit_now){

2115

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

2116

if(quit_now or ret == 0){

2117

break;

2118

}

2119

if(debug){

2120

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

2121

(int)retry_interval);

2122

}

2123

sleep((int)retry_interval);

2124

}

2125

2126

if (not quit_now){

1218

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

1219

if(ret < 0){

1220

exitcode = EXIT_FAILURE;

1221

} else {

2127

1222

exitcode = EXIT_SUCCESS;

2128

1223

}

1224

goto end;

1225

}

2129

1226

2130

goto end;

2131

}

2132

2133

if(quit_now){

2134

goto end;

2135

}

2136

2137

1227

{

2138

1228

AvahiServerConfig config;

2139

1229

/* Do not publish any local Zeroconf records */

2154

1244

2155

1245

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

2156

1246

if(mc.server == NULL){

2157

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

2158

avahi_strerror(error));

2159

exitcode = EX_UNAVAILABLE;

2160

goto end;

2161

}

2162

2163

if(quit_now){

1247

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

1248

avahi_strerror(error));

1249

exitcode = EXIT_FAILURE;

2164

1250

goto end;

2165

1251

}

2166

1252

2169

1255

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2170

1256

NULL, 0, browse_callback, NULL);

2171

1257

if(sb == NULL){

2172

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

2173

avahi_strerror(avahi_server_errno(mc.server)));

2174

exitcode = EX_UNAVAILABLE;

2175

goto end;

2176

}

2177

2178

if(quit_now){

1258

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

1259

avahi_strerror(avahi_server_errno(mc.server)));

1260

exitcode = EXIT_FAILURE;

2179

1261

goto end;

2180

1262

}

2181

1263

2182

1264

/* Run the main loop */

2183

1265

2184

1266

if(debug){

2185

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

2186

}

2187

2188

ret = avahi_loop_with_timeout(mc.simple_poll,

2189

(int)(retry_interval * 1000));

2190

if(debug){

2191

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

2192

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

2193

}

1267

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

1268

}

1269

1270

avahi_simple_poll_loop(mc.simple_poll);

2194

1271

2195

1272

end:

2196

1273

2197

1274

if(debug){

2198

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

1275

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

2199

1276

}

2200

1277

2201

1278

/* Cleanup things */

2218

1295

gpgme_release(mc.ctx);

2219

1296

}

2220

1297

2221

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

2222

has seen */

2223

if(mc.current_server != NULL){

2224

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

2225

while(mc.current_server != NULL){

2226

server *next = mc.current_server->next;

2227

free(mc.current_server);

2228

mc.current_server = next;

2229

}

2230

}

2231

2232

/* Run network hooks */

2233

run_network_hooks("stop", interface, delay);

2234

2235

/* Re-raise priviliges */

2236

{

2237

errno = 0;

2238

ret = seteuid(0);

2239

if(ret == -1){

2240

perror_plus("seteuid");

2241

}

2242

2243

/* Take down the network interface */

2244

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

2245

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

2246

if(ret == -1){

2247

perror_plus("ioctl SIOCGIFFLAGS");

2248

} else if(network.ifr_flags & IFF_UP){

2249

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

2250

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

2251

if(ret == -1){

2252

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2253

}

2254

}

2255

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

2256

if(ret == -1){

2257

perror_plus("close");

2258

}

2259

}

2260

}

2261

/* Lower privileges permanently */

2262

errno = 0;

2263

ret = setuid(uid);

2264

if(ret == -1){

2265

perror_plus("setuid");

2266

}

2267

2268

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

1298

/* Removes the temp directory used by GPGME */

2269

1299

if(tempdir_created){

2270

struct dirent **direntries = NULL;

2271

struct dirent *direntry = NULL;

2272

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

2273

alphasort);

2274

if (numentries > 0){

2275

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

2276

direntry = direntries[i];

1300

DIR *d;

1301

struct dirent *direntry;

1302

d = opendir(tempdir);

1303

if(d == NULL){

1304

if(errno != ENOENT){

1305

perror("opendir");

1306

}

1307

} else {

1308

while(true){

1309

direntry = readdir(d);

1310

if(direntry == NULL){

1311

break;

1312

}

1313

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

1314

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

1315

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

1316

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

1317

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

1318

continue;

1319

}

2277

1320

char *fullname = NULL;

2278

1321

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

2279

1322

direntry->d_name);

2280

1323

if(ret < 0){

2281

perror_plus("asprintf");

1324

perror("asprintf");

2282

1325

continue;

2283

1326

}

2284

1327

ret = remove(fullname);

2285

1328

if(ret == -1){

2286

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

2287

strerror(errno));

1329

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

1330

strerror(errno));

2288

1331

}

2289

1332

free(fullname);

2290

1333

}

2291

}

2292

2293

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

2294

free(direntries);

2295

if (numentries == -1){

2296

perror_plus("scandir");

1334

closedir(d);

2297

1335

}

2298

1336

ret = rmdir(tempdir);

2299

1337

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

2300

perror_plus("rmdir");

2301

}

2302

}

2303

2304

if(quit_now){

2305

sigemptyset(&old_sigterm_action.sa_mask);

2306

old_sigterm_action.sa_handler = SIG_DFL;

2307

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

2308

&old_sigterm_action,

2309

NULL));

2310

if(ret == -1){

2311

perror_plus("sigaction");

2312

}

2313

do {

2314

ret = raise(signal_received);

2315

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

2316

if(ret != 0){

2317

perror_plus("raise");

2318

abort();

2319

}

2320

TEMP_FAILURE_RETRY(pause());

1338

perror("rmdir");

1339

}

2321

1340

}

2322

1341

2323

1342

return exitcode;