/mandos/trunk : revision 237.4.53

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

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*

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* Everything else is

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*

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

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

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* along with this program. If not, see

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

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*

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

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

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*/

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

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#ifndef _LARGEFILE_SOURCE

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#define _LARGEFILE_SOURCE

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#endif

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#endif /* not _LARGEFILE_SOURCE */

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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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#endif /* not _FILE_OFFSET_BITS */

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

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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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stdout, ferror() */

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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, srand(),

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strtof(), abort() */

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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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inet_pton(), connect(),

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getnameinfo() */

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

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#include <dirent.h> /* opendir(), struct dirent, readdir()

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*/

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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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unlinkat() */

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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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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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#include <argz.h> /* argz_add_sep(), argz_next(),

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argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

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argz_count() */

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#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,

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EAI_SYSTEM, gai_strerror() */

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#ifdef __linux__

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

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118

init_gnutls_session(),

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119

GNUTLS_* */

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#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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125

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

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133

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

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134

#define SECKEY "seckey.txt"

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135

#define PUBKEY "pubkey.txt"

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

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137

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bool debug = false;

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139

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@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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int hookdir_fd = -1;

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uid_t uid = 65534;

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gid_t gid = 65534;

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149

/* 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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in_port_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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typedef struct {

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AvahiSimplePoll *simple_poll;

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162

AvahiServer *server;

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163

gnutls_certificate_credentials_t cred;

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164

unsigned int dh_bits;

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165

gnutls_dh_params_t dh_params;

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166

const char *priority;

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167

gpgme_ctx_t ctx;

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server *current_server;

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char *interfaces;

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size_t interfaces_size;

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171

} mandos_context;

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172

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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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/* global so signal handler can reach it*/

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AvahiSimplePoll *simple_poll;

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175

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sig_atomic_t quit_now = 0;

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177

int signal_received = 0;

149

178

179

/* Function to use when printing errors */

180

void perror_plus(const char *print_text){

181

int e = errno;

182

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

183

program_invocation_short_name);

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errno = e;

185

perror(print_text);

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}

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188

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

189

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

190

va_list ap;

191

va_start (ap, format);

192

193

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

194

program_invocation_short_name));

195

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

196

}

197

150

198

/*

151

199

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

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200

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

153

201

* "buffer_length" is how much is already used.

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202

*/

203

__attribute__((nonnull, warn_unused_result))

155

204

size_t incbuffer(char **buffer, size_t buffer_length,

156

size_t buffer_capacity){

205

size_t buffer_capacity){

157

206

if(buffer_length + BUFFER_SIZE > buffer_capacity){

158

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

159

if(buffer == NULL){

207

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

208

if(new_buf == NULL){

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int old_errno = errno;

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free(*buffer);

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errno = old_errno;

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*buffer = NULL;

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213

return 0;

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214

}

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*buffer = new_buf;

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buffer_capacity += BUFFER_SIZE;

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217

}

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return buffer_capacity;

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219

}

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

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__attribute__((nonnull, warn_unused_result))

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

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int af, server **current_server){

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int ret;

226

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

227

if(new_server == NULL){

228

perror_plus("malloc");

229

return false;

230

}

231

*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 };

235

if(new_server->ip == NULL){

236

perror_plus("strdup");

237

free(new_server);

238

return false;

239

}

240

ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));

241

if(ret == -1){

242

perror_plus("clock_gettime");

243

#ifdef __GNUC__

244

#pragma GCC diagnostic push

245

#pragma GCC diagnostic ignored "-Wcast-qual"

246

#endif

247

free((char *)(new_server->ip));

248

#ifdef __GNUC__

249

#pragma GCC diagnostic pop

250

#endif

251

free(new_server);

252

return false;

253

}

254

/* Special case of first server */

255

if(*current_server == NULL){

256

new_server->next = new_server;

257

new_server->prev = new_server;

258

*current_server = new_server;

259

} else {

260

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

261

new_server->next = *current_server;

262

new_server->prev = (*current_server)->prev;

263

new_server->prev->next = new_server;

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(*current_server)->prev = new_server;

265

}

266

return true;

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}

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/*

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* Initialize GPGME.

169

271

*/

170

static bool init_gpgme(const char *seckey,

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const char *pubkey, const char *tempdir){

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__attribute__((nonnull, warn_unused_result))

273

static bool init_gpgme(const char * const seckey,

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const char * const pubkey,

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const char * const tempdir,

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mandos_context *mc){

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gpgme_error_t rc;

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gpgme_engine_info_t engine_info;

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279

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280

/*

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281

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

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282

*/

179

bool import_key(const char *filename){

283

bool import_key(const char * const filename){

180

284

int ret;

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285

int fd;

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286

gpgme_data_t pgp_data;

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184

288

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

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289

if(fd == -1){

186

perror("open");

290

perror_plus("open");

187

291

return false;

188

292

}

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293

190

294

rc = gpgme_data_new_from_fd(&pgp_data, fd);

191

295

if(rc != GPG_ERR_NO_ERROR){

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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));

296

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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return false;

195

299

}

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300

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rc = gpgme_op_import(mc.ctx, pgp_data);

301

rc = gpgme_op_import(mc->ctx, pgp_data);

198

302

if(rc != GPG_ERR_NO_ERROR){

199

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

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gpgme_strsource(rc), gpgme_strerror(rc));

303

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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305

return false;

202

306

}

203

307

204

308

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

205

309

if(ret == -1){

206

perror("close");

310

perror_plus("close");

207

311

}

208

312

gpgme_data_release(pgp_data);

209

313

return true;

210

314

}

211

315

212

316

if(debug){

213

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

317

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

214

318

}

215

319

216

320

/* Init GPGME */

217

321

gpgme_check_version(NULL);

218

322

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

219

323

if(rc != GPG_ERR_NO_ERROR){

220

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

221

gpgme_strsource(rc), gpgme_strerror(rc));

324

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

325

gpgme_strsource(rc), gpgme_strerror(rc));

222

326

return false;

223

327

}

224

328

225

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

329

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

226

330

rc = gpgme_get_engine_info(&engine_info);

227

331

if(rc != GPG_ERR_NO_ERROR){

228

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

229

gpgme_strsource(rc), gpgme_strerror(rc));

332

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

333

gpgme_strsource(rc), gpgme_strerror(rc));

230

334

return false;

231

335

}

232

336

while(engine_info != NULL){

238

342

engine_info = engine_info->next;

239

343

}

240

344

if(engine_info == NULL){

241

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

345

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

346

tempdir);

242

347

return false;

243

348

}

244

349

245

350

/* Create new GPGME "context" */

246

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

351

rc = gpgme_new(&(mc->ctx));

247

352

if(rc != GPG_ERR_NO_ERROR){

248

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

249

gpgme_strsource(rc), gpgme_strerror(rc));

353

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

354

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

355

gpgme_strerror(rc));

250

356

return false;

251

357

}

252

358

261

367

* Decrypt OpenPGP data.

262

368

* Returns -1 on error

263

369

*/

370

__attribute__((nonnull, warn_unused_result))

264

371

static ssize_t pgp_packet_decrypt(const char *cryptotext,

265

372

size_t crypto_size,

266

char **plaintext){

373

char **plaintext,

374

mandos_context *mc){

267

375

gpgme_data_t dh_crypto, dh_plain;

268

376

gpgme_error_t rc;

269

377

ssize_t ret;

271

379

ssize_t plaintext_length = 0;

272

380

273

381

if(debug){

274

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

382

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

275

383

}

276

384

277

385

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

278

386

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

279

387

0);

280

388

if(rc != GPG_ERR_NO_ERROR){

281

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

282

gpgme_strsource(rc), gpgme_strerror(rc));

389

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

390

gpgme_strsource(rc), gpgme_strerror(rc));

283

391

return -1;

284

392

}

285

393

286

394

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

287

395

rc = gpgme_data_new(&dh_plain);

288

396

if(rc != GPG_ERR_NO_ERROR){

289

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

290

gpgme_strsource(rc), gpgme_strerror(rc));

397

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

398

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

399

gpgme_strsource(rc), gpgme_strerror(rc));

291

400

gpgme_data_release(dh_crypto);

292

401

return -1;

293

402

}

294

403

295

404

/* Decrypt data from the cryptotext data buffer to the plaintext

296

405

data buffer */

297

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

406

rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);

298

407

if(rc != GPG_ERR_NO_ERROR){

299

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

300

gpgme_strsource(rc), gpgme_strerror(rc));

408

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

409

gpgme_strsource(rc), gpgme_strerror(rc));

301

410

plaintext_length = -1;

302

411

if(debug){

303

412

gpgme_decrypt_result_t result;

304

result = gpgme_op_decrypt_result(mc.ctx);

413

result = gpgme_op_decrypt_result(mc->ctx);

305

414

if(result == NULL){

306

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

415

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

307

416

} else {

308

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

309

result->unsupported_algorithm);

310

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

311

result->wrong_key_usage);

417

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

418

result->unsupported_algorithm);

419

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

420

result->wrong_key_usage);

312

421

if(result->file_name != NULL){

313

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

422

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

314

423

}

315

424

gpgme_recipient_t recipient;

316

425

recipient = result->recipients;

317

426

while(recipient != NULL){

318

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

319

gpgme_pubkey_algo_name(recipient->pubkey_algo));

320

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

321

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

322

recipient->status == GPG_ERR_NO_SECKEY

323

? "No" : "Yes");

427

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

428

gpgme_pubkey_algo_name

429

(recipient->pubkey_algo));

430

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

431

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

432

recipient->status == GPG_ERR_NO_SECKEY

433

? "No" : "Yes");

324

434

recipient = recipient->next;

325

435

}

326

436

}

329

439

}

330

440

331

441

if(debug){

332

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

442

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

333

443

}

334

444

335

445

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

336

446

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

337

perror("gpgme_data_seek");

447

perror_plus("gpgme_data_seek");

338

448

plaintext_length = -1;

339

449

goto decrypt_end;

340

450

}

342

452

*plaintext = NULL;

343

453

while(true){

344

454

plaintext_capacity = incbuffer(plaintext,

345

(size_t)plaintext_length,

346

plaintext_capacity);

455

(size_t)plaintext_length,

456

plaintext_capacity);

347

457

if(plaintext_capacity == 0){

348

perror("incbuffer");

349

plaintext_length = -1;

350

goto decrypt_end;

458

perror_plus("incbuffer");

459

plaintext_length = -1;

460

goto decrypt_end;

351

461

}

352

462

353

463

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

358

468

break;

359

469

}

360

470

if(ret < 0){

361

perror("gpgme_data_read");

471

perror_plus("gpgme_data_read");

362

472

plaintext_length = -1;

363

473

goto decrypt_end;

364

474

}

366

476

}

367

477

368

478

if(debug){

369

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

479

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

370

480

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

371

481

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

372

482

}

383

493

return plaintext_length;

384

494

}

385

495

386

static const char * safer_gnutls_strerror(int value){

387

const char *ret = gnutls_strerror(value); /* Spurious warning from

388

-Wunreachable-code */

496

__attribute__((warn_unused_result))

497

static const char *safer_gnutls_strerror(int value){

498

const char *ret = gnutls_strerror(value);

389

499

if(ret == NULL)

390

500

ret = "(unknown)";

391

501

return ret;

392

502

}

393

503

394

504

/* GnuTLS log function callback */

505

__attribute__((nonnull))

395

506

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

396

507

const char* string){

397

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

508

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

398

509

}

399

510

511

__attribute__((nonnull, warn_unused_result))

400

512

static int init_gnutls_global(const char *pubkeyfilename,

401

const char *seckeyfilename){

513

const char *seckeyfilename,

514

mandos_context *mc){

402

515

int ret;

403

516

404

517

if(debug){

405

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

518

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

406

519

}

407

520

408

521

ret = gnutls_global_init();

409

522

if(ret != GNUTLS_E_SUCCESS){

410

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

411

safer_gnutls_strerror(ret));

523

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

524

safer_gnutls_strerror(ret));

412

525

return -1;

413

526

}

414

527

421

534

}

422

535

423

536

/* OpenPGP credentials */

424

gnutls_certificate_allocate_credentials(&mc.cred);

537

ret = gnutls_certificate_allocate_credentials(&mc->cred);

425

538

if(ret != GNUTLS_E_SUCCESS){

426

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

427

from

428

-Wunreachable-code

429

*/

430

safer_gnutls_strerror(ret));

539

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

540

safer_gnutls_strerror(ret));

431

541

gnutls_global_deinit();

432

542

return -1;

433

543

}

434

544

435

545

if(debug){

436

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

437

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

438

seckeyfilename);

546

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

547

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

548

pubkeyfilename,

549

seckeyfilename);

439

550

}

440

551

441

552

ret = gnutls_certificate_set_openpgp_key_file

442

(mc.cred, pubkeyfilename, seckeyfilename,

553

(mc->cred, pubkeyfilename, seckeyfilename,

443

554

GNUTLS_OPENPGP_FMT_BASE64);

444

555

if(ret != GNUTLS_E_SUCCESS){

445

fprintf(stderr,

446

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

447

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

448

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

449

safer_gnutls_strerror(ret));

556

fprintf_plus(stderr,

557

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

558

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

559

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

560

safer_gnutls_strerror(ret));

450

561

goto globalfail;

451

562

}

452

563

453

564

/* GnuTLS server initialization */

454

ret = gnutls_dh_params_init(&mc.dh_params);

565

ret = gnutls_dh_params_init(&mc->dh_params);

455

566

if(ret != GNUTLS_E_SUCCESS){

456

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

457

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

567

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

568

" initialization: %s\n",

569

safer_gnutls_strerror(ret));

458

570

goto globalfail;

459

571

}

460

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

572

ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);

461

573

if(ret != GNUTLS_E_SUCCESS){

462

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

463

safer_gnutls_strerror(ret));

574

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

575

safer_gnutls_strerror(ret));

464

576

goto globalfail;

465

577

}

466

578

467

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

579

gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);

468

580

469

581

return 0;

470

582

471

583

globalfail:

472

584

473

gnutls_certificate_free_credentials(mc.cred);

585

gnutls_certificate_free_credentials(mc->cred);

474

586

gnutls_global_deinit();

475

gnutls_dh_params_deinit(mc.dh_params);

587

gnutls_dh_params_deinit(mc->dh_params);

476

588

return -1;

477

589

}

478

590

479

static int init_gnutls_session(gnutls_session_t *session){

591

__attribute__((nonnull, warn_unused_result))

592

static int init_gnutls_session(gnutls_session_t *session,

593

mandos_context *mc){

480

594

int ret;

481

595

/* GnuTLS session creation */

482

596

do {

486

600

}

487

601

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

488

602

if(ret != GNUTLS_E_SUCCESS){

489

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

490

safer_gnutls_strerror(ret));

603

fprintf_plus(stderr,

604

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

605

safer_gnutls_strerror(ret));

491

606

}

492

607

493

608

{

494

609

const char *err;

495

610

do {

496

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

611

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

497

612

if(quit_now){

498

613

gnutls_deinit(*session);

499

614

return -1;

500

615

}

501

616

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

502

617

if(ret != GNUTLS_E_SUCCESS){

503

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

504

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

505

safer_gnutls_strerror(ret));

618

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

619

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

620

safer_gnutls_strerror(ret));

506

621

gnutls_deinit(*session);

507

622

return -1;

508

623

}

510

625

511

626

do {

512

627

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

513

mc.cred);

628

mc->cred);

514

629

if(quit_now){

515

630

gnutls_deinit(*session);

516

631

return -1;

517

632

}

518

633

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

519

634

if(ret != GNUTLS_E_SUCCESS){

520

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

521

safer_gnutls_strerror(ret));

635

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

636

safer_gnutls_strerror(ret));

522

637

gnutls_deinit(*session);

523

638

return -1;

524

639

}

526

641

/* ignore client certificate if any. */

527

642

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

528

643

529

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

644

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

530

645

531

646

return 0;

532

647

}

536

651

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

537

652

538

653

/* Called when a Mandos server is found */

539

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

654

__attribute__((nonnull, warn_unused_result))

655

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

540

656

AvahiIfIndex if_index,

541

int af){

657

int af, mandos_context *mc){

542

658

int ret, tcp_sd = -1;

543

659

ssize_t sret;

544

union {

545

struct sockaddr_in in;

546

struct sockaddr_in6 in6;

547

} to;

660

struct sockaddr_storage to;

548

661

char *buffer = NULL;

549

662

char *decrypted_buffer = NULL;

550

663

size_t buffer_length = 0;

569

682

pf = PF_INET;

570

683

break;

571

684

default:

572

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

685

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

573

686

errno = EINVAL;

574

687

return -1;

575

688

}

576

689

577

ret = init_gnutls_session(&session);

690

/* If the interface is specified and we have a list of interfaces */

691

if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){

692

/* Check if the interface is one of the interfaces we are using */

693

bool match = false;

694

{

695

char *interface = NULL;

696

while((interface=argz_next(mc->interfaces, mc->interfaces_size,

697

interface))){

698

if(if_nametoindex(interface) == (unsigned int)if_index){

699

match = true;

700

break;

701

}

702

}

703

}

704

if(not match){

705

/* This interface does not match any in the list, so we don't

706

connect to the server */

707

if(debug){

708

char interface[IF_NAMESIZE];

709

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

710

perror_plus("if_indextoname");

711

} else {

712

fprintf_plus(stderr, "Skipping server on non-used interface"

713

" \"%s\"\n",

714

if_indextoname((unsigned int)if_index,

715

interface));

716

}

717

}

718

return -1;

719

}

720

}

721

722

ret = init_gnutls_session(&session, mc);

578

723

if(ret != 0){

579

724

return -1;

580

725

}

581

726

582

727

if(debug){

583

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

584

"\n", ip, port);

728

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

729

PRIuMAX "\n", ip, (uintmax_t)port);

585

730

}

586

731

587

732

tcp_sd = socket(pf, SOCK_STREAM, 0);

588

733

if(tcp_sd < 0){

589

734

int e = errno;

590

perror("socket");

735

perror_plus("socket");

591

736

errno = e;

592

737

goto mandos_end;

593

738

}

599

744

600

745

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

601

746

if(af == AF_INET6){

602

to.in6.sin6_family = (sa_family_t)af;

603

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

747

((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;

748

ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);

604

749

} else { /* IPv4 */

605

to.in.sin_family = (sa_family_t)af;

606

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

750

((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;

751

ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);

607

752

}

608

753

if(ret < 0 ){

609

754

int e = errno;

610

perror("inet_pton");

755

perror_plus("inet_pton");

611

756

errno = e;

612

757

goto mandos_end;

613

758

}

614

759

if(ret == 0){

615

760

int e = errno;

616

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

761

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

617

762

errno = e;

618

763

goto mandos_end;

619

764

}

620

765

if(af == AF_INET6){

621

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

622

-Wconversion and

623

-Wunreachable-code */

624

625

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

626

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

627

-Wunreachable-code*/

766

((struct sockaddr_in6 *)&to)->sin6_port = htons(port);

767

if(IN6_IS_ADDR_LINKLOCAL

768

(&((struct sockaddr_in6 *)&to)->sin6_addr)){

628

769

if(if_index == AVAHI_IF_UNSPEC){

629

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

630

" without a network interface\n");

770

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

771

" incomplete without a network interface\n");

631

772

errno = EINVAL;

632

773

goto mandos_end;

633

774

}

634

775

/* Set the network interface number as scope */

635

to.in6.sin6_scope_id = (uint32_t)if_index;

776

((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;

636

777

}

637

778

} else {

638

to.in.sin_port = htons(port); /* Spurious warnings from

639

-Wconversion and

640

-Wunreachable-code */

779

((struct sockaddr_in *)&to)->sin_port = htons(port);

641

780

}

642

781

643

782

if(quit_now){

649

788

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

650

789

char interface[IF_NAMESIZE];

651

790

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

652

perror("if_indextoname");

791

perror_plus("if_indextoname");

653

792

} else {

654

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

655

ip, interface, port);

793

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

794

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

656

795

}

657

796

} else {

658

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

659

port);

797

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

798

ip, (uintmax_t)port);

660

799

}

661

800

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

662

801

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

663

const char *pcret;

664

802

if(af == AF_INET6){

665

pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,

666

sizeof(addrstr));

803

ret = getnameinfo((struct sockaddr *)&to,

804

sizeof(struct sockaddr_in6),

805

addrstr, sizeof(addrstr), NULL, 0,

806

NI_NUMERICHOST);

667

807

} else {

668

pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,

669

sizeof(addrstr));

808

ret = getnameinfo((struct sockaddr *)&to,

809

sizeof(struct sockaddr_in),

810

addrstr, sizeof(addrstr), NULL, 0,

811

NI_NUMERICHOST);

670

812

}

671

if(pcret == NULL){

672

perror("inet_ntop");

673

} else {

674

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

675

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

676

}

813

if(ret == EAI_SYSTEM){

814

perror_plus("getnameinfo");

815

} else if(ret != 0) {

816

fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));

817

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

818

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

677

819

}

678

820

}

679

821

683

825

}

684

826

685

827

if(af == AF_INET6){

686

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

828

ret = connect(tcp_sd, (struct sockaddr *)&to,

829

sizeof(struct sockaddr_in6));

687

830

} else {

688

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

831

ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */

832

sizeof(struct sockaddr_in));

689

833

}

690

834

if(ret < 0){

691

int e = errno;

692

perror("connect");

693

errno = e;

835

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

836

int e = errno;

837

perror_plus("connect");

838

errno = e;

839

}

694

840

goto mandos_end;

695

841

}

696

842

704

850

while(true){

705

851

size_t out_size = strlen(out);

706

852

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

707

out_size - written));

853

out_size - written));

708

854

if(ret == -1){

709

855

int e = errno;

710

perror("write");

856

perror_plus("write");

711

857

errno = e;

712

858

goto mandos_end;

713

859

}

730

876

}

731

877

732

878

if(debug){

733

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

879

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

734

880

}

735

881

736

882

if(quit_now){

738

884

goto mandos_end;

739

885

}

740

886

741

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

887

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

888

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

889

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

890

gnutls_transport_set_ptr(session,

891

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

742

892

743

893

if(quit_now){

744

894

errno = EINTR;

755

905

756

906

if(ret != GNUTLS_E_SUCCESS){

757

907

if(debug){

758

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

908

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

759

909

gnutls_perror(ret);

760

910

}

761

911

errno = EPROTO;

765

915

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

766

916

767

917

if(debug){

768

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

769

ip);

918

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

919

" %s\n", ip);

770

920

}

771

921

772

922

while(true){

777

927

}

778

928

779

929

buffer_capacity = incbuffer(&buffer, buffer_length,

780

buffer_capacity);

930

buffer_capacity);

781

931

if(buffer_capacity == 0){

782

932

int e = errno;

783

perror("incbuffer");

933

perror_plus("incbuffer");

784

934

errno = e;

785

935

goto mandos_end;

786

936

}

810

960

}

811

961

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

812

962

if(ret < 0){

813

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

963

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

964

"***\n");

814

965

gnutls_perror(ret);

815

966

errno = EPROTO;

816

967

goto mandos_end;

817

968

}

818

969

break;

819

970

default:

820

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

821

" encrypted session with Mandos server\n");

971

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

972

" encrypted session with Mandos server\n");

822

973

gnutls_bye(session, GNUTLS_SHUT_RDWR);

823

974

errno = EIO;

824

975

goto mandos_end;

829

980

}

830

981

831

982

if(debug){

832

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

983

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

833

984

}

834

985

835

986

if(quit_now){

847

998

848

999

if(buffer_length > 0){

849

1000

ssize_t decrypted_buffer_size;

850

decrypted_buffer_size = pgp_packet_decrypt(buffer,

851

buffer_length,

852

&decrypted_buffer);

1001

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

1002

&decrypted_buffer, mc);

853

1003

if(decrypted_buffer_size >= 0){

854

1004

855

1005

written = 0;

865

1015

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

866

1016

int e = errno;

867

1017

if(debug){

868

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

869

strerror(errno));

1018

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

1019

strerror(errno));

870

1020

}

871

1021

errno = e;

872

1022

goto mandos_end;

891

1041

if(e == 0){

892

1042

e = errno;

893

1043

}

894

perror("close");

1044

perror_plus("close");

895

1045

}

896

1046

gnutls_deinit(session);

1047

errno = e;

897

1048

if(quit_now){

898

e = EINTR;

1049

errno = EINTR;

899

1050

retval = -1;

900

1051

}

901

errno = e;

902

1052

}

903

1053

return retval;

904

1054

}

905

1055

1056

__attribute__((nonnull))

906

1057

static void resolve_callback(AvahiSServiceResolver *r,

907

1058

AvahiIfIndex interface,

908

1059

AvahiProtocol proto,

916

1067

AVAHI_GCC_UNUSED AvahiStringList *txt,

917

1068

AVAHI_GCC_UNUSED AvahiLookupResultFlags

918

1069

flags,

919

AVAHI_GCC_UNUSED void* userdata){

920

assert(r);

1070

void *mc){

1071

if(r == NULL){

1072

return;

1073

}

921

1074

922

1075

/* Called whenever a service has been resolved successfully or

923

1076

timed out */

924

1077

925

1078

if(quit_now){

1079

avahi_s_service_resolver_free(r);

926

1080

return;

927

1081

}

928

1082

929

1083

switch(event){

930

1084

default:

931

1085

case AVAHI_RESOLVER_FAILURE:

932

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

933

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

934

avahi_strerror(avahi_server_errno(mc.server)));

1086

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

1087

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

1088

domain,

1089

avahi_strerror(avahi_server_errno

1090

(((mandos_context*)mc)->server)));

935

1091

break;

936

1092

937

1093

case AVAHI_RESOLVER_FOUND:

939

1095

char ip[AVAHI_ADDRESS_STR_MAX];

940

1096

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

941

1097

if(debug){

942

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

943

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

944

ip, (intmax_t)interface, port);

1098

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

1099

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

1100

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

945

1101

}

946

int ret = start_mandos_communication(ip, port, interface,

947

avahi_proto_to_af(proto));

1102

int ret = start_mandos_communication(ip, (in_port_t)port,

1103

interface,

1104

avahi_proto_to_af(proto),

1105

mc);

948

1106

if(ret == 0){

949

avahi_simple_poll_quit(mc.simple_poll);

1107

avahi_simple_poll_quit(simple_poll);

1108

} else {

1109

if(not add_server(ip, (in_port_t)port, interface,

1110

avahi_proto_to_af(proto),

1111

&((mandos_context*)mc)->current_server)){

1112

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

1113

" list\n", name);

1114

}

950

1115

}

951

1116

}

952

1117

}

962

1127

const char *domain,

963

1128

AVAHI_GCC_UNUSED AvahiLookupResultFlags

964

1129

flags,

965

AVAHI_GCC_UNUSED void* userdata){

966

assert(b);

1130

void *mc){

1131

if(b == NULL){

1132

return;

1133

}

967

1134

968

1135

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

969

1136

is removed from the LAN */

976

1143

default:

977

1144

case AVAHI_BROWSER_FAILURE:

978

1145

979

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

980

avahi_strerror(avahi_server_errno(mc.server)));

981

avahi_simple_poll_quit(mc.simple_poll);

1146

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

1147

avahi_strerror(avahi_server_errno

1148

(((mandos_context*)mc)->server)));

1149

avahi_simple_poll_quit(simple_poll);

982

1150

return;

983

1151

984

1152

case AVAHI_BROWSER_NEW:

987

1155

the callback function is called the Avahi server will free the

988

1156

resolver for us. */

989

1157

990

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

991

name, type, domain, protocol, 0,

992

resolve_callback, NULL) == NULL)

993

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

994

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

1158

if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,

1159

interface, protocol, name, type,

1160

domain, protocol, 0,

1161

resolve_callback, mc) == NULL)

1162

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

1163

" %s\n", name,

1164

avahi_strerror(avahi_server_errno

1165

(((mandos_context*)mc)->server)));

995

1166

break;

996

1167

997

1168

case AVAHI_BROWSER_REMOVE:

1000

1171

case AVAHI_BROWSER_ALL_FOR_NOW:

1001

1172

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1002

1173

if(debug){

1003

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

1174

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

1175

" searching...\n");

1004

1176

}

1005

1177

break;

1006

1178

}

1007

1179

}

1008

1180

1009

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

1181

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

1010

1182

static void handle_sigterm(int sig){

1011

1183

if(quit_now){

1012

1184

return;

1014

1186

quit_now = 1;

1015

1187

signal_received = sig;

1016

1188

int old_errno = errno;

1017

if(mc.simple_poll != NULL){

1018

avahi_simple_poll_quit(mc.simple_poll);

1019

}

1020

errno = old_errno;

1189

/* set main loop to exit */

1190

if(simple_poll != NULL){

1191

avahi_simple_poll_quit(simple_poll);

1192

}

1193

errno = old_errno;

1194

}

1195

1196

__attribute__((nonnull, warn_unused_result))

1197

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

1198

int ret;

1199

error_t ret_errno;

1200

1201

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

1202

if(s < 0){

1203

ret_errno = errno;

1204

perror_plus("socket");

1205

errno = ret_errno;

1206

return false;

1207

}

1208

strcpy(ifr->ifr_name, ifname);

1209

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1210

if(ret == -1){

1211

if(debug){

1212

ret_errno = errno;

1213

perror_plus("ioctl SIOCGIFFLAGS");

1214

errno = ret_errno;

1215

}

1216

return false;

1217

}

1218

return true;

1219

}

1220

1221

__attribute__((nonnull, warn_unused_result))

1222

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

1223

1224

/* Reject the loopback device */

1225

if(ifr->ifr_flags & IFF_LOOPBACK){

1226

if(debug){

1227

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

1228

ifname);

1229

}

1230

return false;

1231

}

1232

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

1233

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

1234

if(debug){

1235

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

1236

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

1237

}

1238

return true;

1239

}

1240

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

1241

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

1242

if(debug){

1243

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1244

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

1245

}

1246

return false;

1247

}

1248

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

1249

if(ifr->ifr_flags & IFF_NOARP){

1250

if(debug){

1251

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

1252

ifname);

1253

}

1254

return false;

1255

}

1256

1257

/* Accept this device */

1258

if(debug){

1259

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

1260

}

1261

return true;

1262

}

1263

1264

/*

1265

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

1266

* corresponds to an acceptable network device.

1267

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

1268

*/

1269

__attribute__((nonnull, warn_unused_result))

1270

int good_interface(const struct dirent *if_entry){

1271

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

1272

return 0;

1273

}

1274

1275

struct ifreq ifr;

1276

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

1277

if(debug){

1278

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

1279

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

1280

}

1281

return 0;

1282

}

1283

1284

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

1285

return 0;

1286

}

1287

return 1;

1288

}

1289

1290

/*

1291

* This function determines if a network interface is up.

1292

*/

1293

__attribute__((nonnull, warn_unused_result))

1294

bool interface_is_up(const char *interface){

1295

struct ifreq ifr;

1296

if(not get_flags(interface, &ifr)){

1297

if(debug){

1298

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

1299

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

1300

}

1301

return false;

1302

}

1303

1304

return (bool)(ifr.ifr_flags & IFF_UP);

1305

}

1306

1307

/*

1308

* This function determines if a network interface is running

1309

*/

1310

__attribute__((nonnull, warn_unused_result))

1311

bool interface_is_running(const char *interface){

1312

struct ifreq ifr;

1313

if(not get_flags(interface, &ifr)){

1314

if(debug){

1315

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

1316

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

1317

}

1318

return false;

1319

}

1320

1321

return (bool)(ifr.ifr_flags & IFF_RUNNING);

1322

}

1323

1324

__attribute__((nonnull, pure, warn_unused_result))

1325

int notdotentries(const struct dirent *direntry){

1326

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

1327

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

1328

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

1329

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

1330

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

1331

return 0;

1332

}

1333

return 1;

1334

}

1335

1336

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

1337

__attribute__((nonnull, warn_unused_result))

1338

int runnable_hook(const struct dirent *direntry){

1339

int ret;

1340

size_t sret;

1341

struct stat st;

1342

1343

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

1344

/* Empty name? */

1345

return 0;

1346

}

1347

1348

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

1349

"abcdefghijklmnopqrstuvwxyz"

1350

"0123456789"

1351

"_.-");

1352

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

1353

/* Contains non-allowed characters */

1354

if(debug){

1355

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

1356

direntry->d_name);

1357

}

1358

return 0;

1359

}

1360

1361

ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);

1362

if(ret == -1){

1363

if(debug){

1364

perror_plus("Could not stat hook");

1365

}

1366

return 0;

1367

}

1368

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

1369

/* Not a regular file */

1370

if(debug){

1371

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

1372

direntry->d_name);

1373

}

1374

return 0;

1375

}

1376

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

1377

/* Not executable */

1378

if(debug){

1379

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

1380

direntry->d_name);

1381

}

1382

return 0;

1383

}

1384

if(debug){

1385

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

1386

direntry->d_name);

1387

}

1388

return 1;

1389

}

1390

1391

__attribute__((nonnull, warn_unused_result))

1392

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1393

mandos_context *mc){

1394

int ret;

1395

struct timespec now;

1396

struct timespec waited_time;

1397

intmax_t block_time;

1398

1399

while(true){

1400

if(mc->current_server == NULL){

1401

if(debug){

1402

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

1403

" No timeout!\n");

1404

}

1405

ret = avahi_simple_poll_iterate(s, -1);

1406

} else {

1407

if(debug){

1408

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

1409

" it, or wait\n");

1410

}

1411

/* the current time */

1412

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1413

if(ret == -1){

1414

perror_plus("clock_gettime");

1415

return -1;

1416

}

1417

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

1418

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

1419

waited_time.tv_sec = (now.tv_sec

1420

- mc->current_server->last_seen.tv_sec);

1421

waited_time.tv_nsec = (now.tv_nsec

1422

- mc->current_server->last_seen.tv_nsec);

1423

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

1424

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

1425

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

1426

block_time = ((retry_interval

1427

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

1428

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

1429

1430

if(debug){

1431

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

1432

block_time);

1433

}

1434

1435

if(block_time <= 0){

1436

ret = start_mandos_communication(mc->current_server->ip,

1437

mc->current_server->port,

1438

mc->current_server->if_index,

1439

mc->current_server->af, mc);

1440

if(ret == 0){

1441

avahi_simple_poll_quit(s);

1442

return 0;

1443

}

1444

ret = clock_gettime(CLOCK_MONOTONIC,

1445

&mc->current_server->last_seen);

1446

if(ret == -1){

1447

perror_plus("clock_gettime");

1448

return -1;

1449

}

1450

mc->current_server = mc->current_server->next;

1451

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

1452

servers, but don't block */

1453

}

1454

1455

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

1456

}

1457

if(ret != 0){

1458

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

1459

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

1460

}

1461

}

1462

}

1463

}

1464

1465

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

1466

__attribute__((warn_unused_result))

1467

error_t raise_privileges(void){

1468

error_t old_errno = errno;

1469

error_t ret_errno = 0;

1470

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

1471

ret_errno = errno;

1472

}

1473

errno = old_errno;

1474

return ret_errno;

1475

}

1476

1477

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

1478

__attribute__((warn_unused_result))

1479

error_t raise_privileges_permanently(void){

1480

error_t old_errno = errno;

1481

error_t ret_errno = raise_privileges();

1482

if(ret_errno != 0){

1483

errno = old_errno;

1484

return ret_errno;

1485

}

1486

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

1487

ret_errno = errno;

1488

}

1489

errno = old_errno;

1490

return ret_errno;

1491

}

1492

1493

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

1494

__attribute__((warn_unused_result))

1495

error_t lower_privileges(void){

1496

error_t old_errno = errno;

1497

error_t ret_errno = 0;

1498

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

1499

ret_errno = errno;

1500

}

1501

errno = old_errno;

1502

return ret_errno;

1503

}

1504

1505

/* Lower privileges permanently */

1506

__attribute__((warn_unused_result))

1507

error_t lower_privileges_permanently(void){

1508

error_t old_errno = errno;

1509

error_t ret_errno = 0;

1510

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

1511

ret_errno = errno;

1512

}

1513

errno = old_errno;

1514

return ret_errno;

1515

}

1516

1517

__attribute__((nonnull))

1518

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

1519

const float delay){

1520

struct dirent **direntries = NULL;

1521

if(hookdir_fd == -1){

1522

hookdir_fd = open(hookdir, O_RDONLY);

1523

if(hookdir_fd == -1){

1524

if(errno == ENOENT){

1525

if(debug){

1526

fprintf_plus(stderr, "Network hook directory \"%s\" not"

1527

" found\n", hookdir);

1528

}

1529

} else {

1530

perror_plus("open");

1531

}

1532

return;

1533

}

1534

}

1535

#ifdef __GLIBC__

1536

#if __GLIBC_PREREQ(2, 15)

1537

int numhooks = scandirat(hookdir_fd, ".", &direntries,

1538

runnable_hook, alphasort);

1539

#else /* not __GLIBC_PREREQ(2, 15) */

1540

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

1541

alphasort);

1542

#endif /* not __GLIBC_PREREQ(2, 15) */

1543

#else /* not __GLIBC__ */

1544

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

1545

alphasort);

1546

#endif /* not __GLIBC__ */

1547

if(numhooks == -1){

1548

perror_plus("scandir");

1549

return;

1550

}

1551

struct dirent *direntry;

1552

int ret;

1553

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

1554

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

1555

direntry = direntries[i];

1556

if(debug){

1557

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

1558

direntry->d_name);

1559

}

1560

pid_t hook_pid = fork();

1561

if(hook_pid == 0){

1562

/* Child */

1563

/* Raise privileges */

1564

errno = raise_privileges_permanently();

1565

if(errno != 0){

1566

perror_plus("Failed to raise privileges");

1567

_exit(EX_NOPERM);

1568

}

1569

/* Set group */

1570

errno = 0;

1571

ret = setgid(0);

1572

if(ret == -1){

1573

perror_plus("setgid");

1574

_exit(EX_NOPERM);

1575

}

1576

/* Reset supplementary groups */

1577

errno = 0;

1578

ret = setgroups(0, NULL);

1579

if(ret == -1){

1580

perror_plus("setgroups");

1581

_exit(EX_NOPERM);

1582

}

1583

ret = dup2(devnull, STDIN_FILENO);

1584

if(ret == -1){

1585

perror_plus("dup2(devnull, STDIN_FILENO)");

1586

_exit(EX_OSERR);

1587

}

1588

ret = close(devnull);

1589

if(ret == -1){

1590

perror_plus("close");

1591

_exit(EX_OSERR);

1592

}

1593

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1594

if(ret == -1){

1595

perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");

1596

_exit(EX_OSERR);

1597

}

1598

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

1599

if(ret == -1){

1600

perror_plus("setenv");

1601

_exit(EX_OSERR);

1602

}

1603

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

1604

if(ret == -1){

1605

perror_plus("setenv");

1606

_exit(EX_OSERR);

1607

}

1608

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

1609

if(ret == -1){

1610

perror_plus("setenv");

1611

_exit(EX_OSERR);

1612

}

1613

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

1614

if(ret == -1){

1615

perror_plus("setenv");

1616

_exit(EX_OSERR);

1617

}

1618

char *delaystring;

1619

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

1620

if(ret == -1){

1621

perror_plus("asprintf");

1622

_exit(EX_OSERR);

1623

}

1624

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

1625

if(ret == -1){

1626

free(delaystring);

1627

perror_plus("setenv");

1628

_exit(EX_OSERR);

1629

}

1630

free(delaystring);

1631

if(connect_to != NULL){

1632

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

1633

if(ret == -1){

1634

perror_plus("setenv");

1635

_exit(EX_OSERR);

1636

}

1637

}

1638

int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);

1639

if(hook_fd == -1){

1640

perror_plus("openat");

1641

_exit(EXIT_FAILURE);

1642

}

1643

if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){

1644

perror_plus("close");

1645

_exit(EXIT_FAILURE);

1646

}

1647

if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },

1648

environ) == -1){

1649

perror_plus("fexecve");

1650

_exit(EXIT_FAILURE);

1651

}

1652

} else {

1653

int status;

1654

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

1655

perror_plus("waitpid");

1656

free(direntry);

1657

continue;

1658

}

1659

if(WIFEXITED(status)){

1660

if(WEXITSTATUS(status) != 0){

1661

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

1662

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

1663

WEXITSTATUS(status));

1664

free(direntry);

1665

continue;

1666

}

1667

} else if(WIFSIGNALED(status)){

1668

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

1669

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

1670

WTERMSIG(status));

1671

free(direntry);

1672

continue;

1673

} else {

1674

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

1675

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

1676

free(direntry);

1677

continue;

1678

}

1679

}

1680

if(debug){

1681

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

1682

direntry->d_name);

1683

}

1684

free(direntry);

1685

}

1686

free(direntries);

1687

if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){

1688

perror_plus("close");

1689

} else {

1690

hookdir_fd = -1;

1691

}

1692

close(devnull);

1693

}

1694

1695

__attribute__((nonnull, warn_unused_result))

1696

error_t bring_up_interface(const char *const interface,

1697

const float delay){

1698

error_t old_errno = errno;

1699

int ret;

1700

struct ifreq network;

1701

unsigned int if_index = if_nametoindex(interface);

1702

if(if_index == 0){

1703

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

1704

errno = old_errno;

1705

return ENXIO;

1706

}

1707

1708

if(quit_now){

1709

errno = old_errno;

1710

return EINTR;

1711

}

1712

1713

if(not interface_is_up(interface)){

1714

error_t ret_errno = 0, ioctl_errno = 0;

1715

if(not get_flags(interface, &network)){

1716

ret_errno = errno;

1717

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

1718

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

1719

errno = old_errno;

1720

return ret_errno;

1721

}

1722

network.ifr_flags |= IFF_UP; /* set flag */

1723

1724

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

1725

if(sd == -1){

1726

ret_errno = errno;

1727

perror_plus("socket");

1728

errno = old_errno;

1729

return ret_errno;

1730

}

1731

1732

if(quit_now){

1733

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

1734

if(ret == -1){

1735

perror_plus("close");

1736

}

1737

errno = old_errno;

1738

return EINTR;

1739

}

1740

1741

if(debug){

1742

fprintf_plus(stderr, "Bringing up interface \"%s\"\n",

1743

interface);

1744

}

1745

1746

/* Raise privileges */

1747

ret_errno = raise_privileges();

1748

if(ret_errno != 0){

1749

errno = ret_errno;

1750

perror_plus("Failed to raise privileges");

1751

}

1752

1753

#ifdef __linux__

1754

int ret_linux;

1755

bool restore_loglevel = false;

1756

if(ret_errno == 0){

1757

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1758

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

1759

ret_linux = klogctl(8, NULL, 5);

1760

if(ret_linux == -1){

1761

perror_plus("klogctl");

1762

} else {

1763

restore_loglevel = true;

1764

}

1765

}

1766

#endif /* __linux__ */

1767

int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);

1768

ioctl_errno = errno;

1769

#ifdef __linux__

1770

if(restore_loglevel){

1771

ret_linux = klogctl(7, NULL, 0);

1772

if(ret_linux == -1){

1773

perror_plus("klogctl");

1774

}

1775

}

1776

#endif /* __linux__ */

1777

1778

/* If raise_privileges() succeeded above */

1779

if(ret_errno == 0){

1780

/* Lower privileges */

1781

ret_errno = lower_privileges();

1782

if(ret_errno != 0){

1783

errno = ret_errno;

1784

perror_plus("Failed to lower privileges");

1785

}

1786

}

1787

1788

/* Close the socket */

1789

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

1790

if(ret == -1){

1791

perror_plus("close");

1792

}

1793

1794

if(ret_setflags == -1){

1795

errno = ioctl_errno;

1796

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1797

errno = old_errno;

1798

return ioctl_errno;

1799

}

1800

} else if(debug){

1801

fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",

1802

interface);

1803

}

1804

1805

/* Sleep checking until interface is running.

1806

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

1807

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

1808

if(interface_is_running(interface)){

1809

break;

1810

}

1811

struct timespec sleeptime = { .tv_nsec = 250000000 };

1812

ret = nanosleep(&sleeptime, NULL);

1813

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

1814

perror_plus("nanosleep");

1815

}

1816

}

1817

1818

errno = old_errno;

1819

return 0;

1820

}

1821

1822

__attribute__((nonnull, warn_unused_result))

1823

error_t take_down_interface(const char *const interface){

1824

error_t old_errno = errno;

1825

struct ifreq network;

1826

unsigned int if_index = if_nametoindex(interface);

1827

if(if_index == 0){

1828

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

1829

errno = old_errno;

1830

return ENXIO;

1831

}

1832

if(interface_is_up(interface)){

1833

error_t ret_errno = 0, ioctl_errno = 0;

1834

if(not get_flags(interface, &network) and debug){

1835

ret_errno = errno;

1836

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

1837

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

1838

errno = old_errno;

1839

return ret_errno;

1840

}

1841

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

1842

1843

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

1844

if(sd == -1){

1845

ret_errno = errno;

1846

perror_plus("socket");

1847

errno = old_errno;

1848

return ret_errno;

1849

}

1850

1851

if(debug){

1852

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

1853

interface);

1854

}

1855

1856

/* Raise privileges */

1857

ret_errno = raise_privileges();

1858

if(ret_errno != 0){

1859

errno = ret_errno;

1860

perror_plus("Failed to raise privileges");

1861

}

1862

1863

int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);

1864

ioctl_errno = errno;

1865

1866

/* If raise_privileges() succeeded above */

1867

if(ret_errno == 0){

1868

/* Lower privileges */

1869

ret_errno = lower_privileges();

1870

if(ret_errno != 0){

1871

errno = ret_errno;

1872

perror_plus("Failed to lower privileges");

1873

}

1874

}

1875

1876

/* Close the socket */

1877

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

1878

if(ret == -1){

1879

perror_plus("close");

1880

}

1881

1882

if(ret_setflags == -1){

1883

errno = ioctl_errno;

1884

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1885

errno = old_errno;

1886

return ioctl_errno;

1887

}

1888

} else if(debug){

1889

fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",

1890

interface);

1891

}

1892

1893

errno = old_errno;

1894

return 0;

1021

1895

}

1022

1896

1023

1897

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

1898

mandos_context mc = { .server = NULL, .dh_bits = 1024,

1899

.priority = "SECURE256:!CTYPE-X.509:"

1900

"+CTYPE-OPENPGP", .current_server = NULL,

1901

.interfaces = NULL, .interfaces_size = 0 };

1024

1902

AvahiSServiceBrowser *sb = NULL;

1025

int error;

1903

error_t ret_errno;

1026

1904

int ret;

1027

1905

intmax_t tmpmax;

1028

1906

char *tmp;

1029

1907

int exitcode = EXIT_SUCCESS;

1030

const char *interface = "eth0";

1031

struct ifreq network;

1032

int sd = -1;

1033

bool take_down_interface = false;

1034

uid_t uid;

1035

gid_t gid;

1036

char *connect_to = NULL;

1037

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

1038

bool tempdir_created = false;

1908

char *interfaces_to_take_down = NULL;

1909

size_t interfaces_to_take_down_size = 0;

1910

char run_tempdir[] = "/run/tmp/mandosXXXXXX";

1911

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

1912

char *tempdir = NULL;

1039

1913

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1040

1914

const char *seckey = PATHDIR "/" SECKEY;

1041

1915

const char *pubkey = PATHDIR "/" PUBKEY;

1916

char *interfaces_hooks = NULL;

1042

1917

1043

1918

bool gnutls_initialized = false;

1044

1919

bool gpgme_initialized = false;

1045

1920

float delay = 2.5f;

1921

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

1922

retrying the same server again */

1046

1923

1047

1924

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1048

1925

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1054

1931

errno = 0;

1055

1932

ret = setgid(gid);

1056

1933

if(ret == -1){

1057

perror("setgid");

1934

perror_plus("setgid");

1058

1935

}

1059

1936

1060

1937

/* Lower user privileges (temporarily) */

1061

1938

errno = 0;

1062

1939

ret = seteuid(uid);

1063

1940

if(ret == -1){

1064

perror("seteuid");

1941

perror_plus("seteuid");

1065

1942

}

1066

1943

1067

1944

if(quit_now){

1102

1979

.arg = "SECONDS",

1103

1980

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

1104

1981

.group = 2 },

1982

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

1983

.arg = "SECONDS",

1984

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

1985

.group = 2 },

1986

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

1987

.arg = "DIR",

1988

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

1989

.group = 2 },

1105

1990

/*

1106

1991

* These reproduce what we would get without ARGP_NO_HELP

1107

1992

*/

1125

2010

connect_to = arg;

1126

2011

break;

1127

2012

case 'i': /* --interface */

1128

interface = arg;

2013

ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,

2014

arg, (int)',');

2015

if(ret_errno != 0){

2016

argp_error(state, "%s", strerror(ret_errno));

2017

}

1129

2018

break;

1130

2019

case 's': /* --seckey */

1131

2020

seckey = arg;

1151

2040

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

1152

2041

argp_error(state, "Bad delay");

1153

2042

}

2043

case 132: /* --retry */

2044

errno = 0;

2045

retry_interval = strtod(arg, &tmp);

2046

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

2047

or (retry_interval * 1000) > INT_MAX

2048

or retry_interval < 0){

2049

argp_error(state, "Bad retry interval");

2050

}

2051

break;

2052

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

2053

hookdir = arg;

1154

2054

break;

1155

2055

/*

1156

2056

* These reproduce what we would get without ARGP_NO_HELP

1163

2063

argp_state_help(state, state->out_stream,

1164

2064

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1165

2065

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

1166

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

2066

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

1167

2067

exit(argp_err_exit_status);

1168

2068

break;

1169

2069

default:

1184

2084

case ENOMEM:

1185

2085

default:

1186

2086

errno = ret;

1187

perror("argp_parse");

2087

perror_plus("argp_parse");

1188

2088

exitcode = EX_OSERR;

1189

2089

goto end;

1190

2090

case EINVAL:

1192

2092

goto end;

1193

2093

}

1194

2094

}

2095

2096

{

2097

/* Work around Debian bug #633582:

2098

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

2099

2100

/* Re-raise privileges */

2101

ret_errno = raise_privileges();

2102

if(ret_errno != 0){

2103

errno = ret_errno;

2104

perror_plus("Failed to raise privileges");

2105

} else {

2106

struct stat st;

2107

2108

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

2109

int seckey_fd = open(seckey, O_RDONLY);

2110

if(seckey_fd == -1){

2111

perror_plus("open");

2112

} else {

2113

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

2114

if(ret == -1){

2115

perror_plus("fstat");

2116

} else {

2117

if(S_ISREG(st.st_mode)

2118

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

2119

ret = fchown(seckey_fd, uid, gid);

2120

if(ret == -1){

2121

perror_plus("fchown");

2122

}

2123

}

2124

}

2125

TEMP_FAILURE_RETRY(close(seckey_fd));

2126

}

2127

}

2128

2129

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

2130

int pubkey_fd = open(pubkey, O_RDONLY);

2131

if(pubkey_fd == -1){

2132

perror_plus("open");

2133

} else {

2134

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

2135

if(ret == -1){

2136

perror_plus("fstat");

2137

} else {

2138

if(S_ISREG(st.st_mode)

2139

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

2140

ret = fchown(pubkey_fd, uid, gid);

2141

if(ret == -1){

2142

perror_plus("fchown");

2143

}

2144

}

2145

}

2146

TEMP_FAILURE_RETRY(close(pubkey_fd));

2147

}

2148

}

2149

2150

/* Lower privileges */

2151

ret_errno = lower_privileges();

2152

if(ret_errno != 0){

2153

errno = ret_errno;

2154

perror_plus("Failed to lower privileges");

2155

}

2156

}

2157

}

2158

2159

/* Remove invalid interface names (except "none") */

2160

{

2161

char *interface = NULL;

2162

while((interface = argz_next(mc.interfaces, mc.interfaces_size,

2163

interface))){

2164

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

2165

and if_nametoindex(interface) == 0){

2166

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

2167

fprintf_plus(stderr, "Not using nonexisting interface"

2168

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

2169

}

2170

argz_delete(&mc.interfaces, &mc.interfaces_size, interface);

2171

interface = NULL;

2172

}

2173

}

2174

}

2175

2176

/* Run network hooks */

2177

{

2178

if(mc.interfaces != NULL){

2179

interfaces_hooks = malloc(mc.interfaces_size);

2180

if(interfaces_hooks == NULL){

2181

perror_plus("malloc");

2182

goto end;

2183

}

2184

memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);

2185

argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');

2186

}

2187

run_network_hooks("start", interfaces_hooks != NULL ?

2188

interfaces_hooks : "", delay);

2189

}

1195

2190

1196

2191

if(not debug){

1197

2192

avahi_set_log_function(empty_log);

1201

2196

from the signal handler */

1202

2197

/* Initialize the pseudo-RNG for Avahi */

1203

2198

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

1204

mc.simple_poll = avahi_simple_poll_new();

1205

if(mc.simple_poll == NULL){

1206

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

2199

simple_poll = avahi_simple_poll_new();

2200

if(simple_poll == NULL){

2201

fprintf_plus(stderr,

2202

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

1207

2203

exitcode = EX_UNAVAILABLE;

1208

2204

goto end;

1209

2205

}

1211

2207

sigemptyset(&sigterm_action.sa_mask);

1212

2208

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

1213

2209

if(ret == -1){

1214

perror("sigaddset");

2210

perror_plus("sigaddset");

1215

2211

exitcode = EX_OSERR;

1216

2212

goto end;

1217

2213

}

1218

2214

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

1219

2215

if(ret == -1){

1220

perror("sigaddset");

2216

perror_plus("sigaddset");

1221

2217

exitcode = EX_OSERR;

1222

2218

goto end;

1223

2219

}

1224

2220

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

1225

2221

if(ret == -1){

1226

perror("sigaddset");

2222

perror_plus("sigaddset");

1227

2223

exitcode = EX_OSERR;

1228

2224

goto end;

1229

2225

}

1233

2229

*/

1234

2230

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

1235

2231

if(ret == -1){

1236

perror("sigaction");

2232

perror_plus("sigaction");

1237

2233

return EX_OSERR;

1238

2234

}

1239

2235

if(old_sigterm_action.sa_handler != SIG_IGN){

1240

2236

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

1241

2237

if(ret == -1){

1242

perror("sigaction");

2238

perror_plus("sigaction");

1243

2239

exitcode = EX_OSERR;

1244

2240

goto end;

1245

2241

}

1246

2242

}

1247

2243

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

1248

2244

if(ret == -1){

1249

perror("sigaction");

2245

perror_plus("sigaction");

1250

2246

return EX_OSERR;

1251

2247

}

1252

2248

if(old_sigterm_action.sa_handler != SIG_IGN){

1253

2249

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

1254

2250

if(ret == -1){

1255

perror("sigaction");

2251

perror_plus("sigaction");

1256

2252

exitcode = EX_OSERR;

1257

2253

goto end;

1258

2254

}

1259

2255

}

1260

2256

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

1261

2257

if(ret == -1){

1262

perror("sigaction");

2258

perror_plus("sigaction");

1263

2259

return EX_OSERR;

1264

2260

}

1265

2261

if(old_sigterm_action.sa_handler != SIG_IGN){

1266

2262

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

1267

2263

if(ret == -1){

1268

perror("sigaction");

1269

exitcode = EX_OSERR;

1270

goto end;

1271

}

1272

}

1273

1274

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

1275

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

1276

if_index = (AvahiIfIndex) if_nametoindex(interface);

1277

if(if_index == 0){

1278

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

1279

exitcode = EX_UNAVAILABLE;

1280

goto end;

1281

}

1282

1283

if(quit_now){

1284

goto end;

1285

}

1286

1287

/* Re-raise priviliges */

1288

errno = 0;

1289

ret = seteuid(0);

1290

if(ret == -1){

1291

perror("seteuid");

1292

}

1293

1294

#ifdef __linux__

1295

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1296

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

1297

ret = klogctl(8, NULL, 5);

1298

bool restore_loglevel = true;

1299

if(ret == -1){

1300

restore_loglevel = false;

1301

perror("klogctl");

1302

}

1303

#endif /* __linux__ */

1304

1305

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1306

if(sd < 0){

1307

perror("socket");

1308

exitcode = EX_OSERR;

1309

#ifdef __linux__

1310

if(restore_loglevel){

1311

ret = klogctl(7, NULL, 0);

1312

if(ret == -1){

1313

perror("klogctl");

1314

}

1315

}

1316

#endif /* __linux__ */

1317

/* Lower privileges */

1318

errno = 0;

1319

ret = seteuid(uid);

1320

if(ret == -1){

1321

perror("seteuid");

1322

}

1323

goto end;

1324

}

1325

strcpy(network.ifr_name, interface);

1326

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

1327

if(ret == -1){

1328

perror("ioctl SIOCGIFFLAGS");

1329

#ifdef __linux__

1330

if(restore_loglevel){

1331

ret = klogctl(7, NULL, 0);

1332

if(ret == -1){

1333

perror("klogctl");

1334

}

1335

}

1336

#endif /* __linux__ */

1337

exitcode = EX_OSERR;

1338

/* Lower privileges */

1339

errno = 0;

1340

ret = seteuid(uid);

1341

if(ret == -1){

1342

perror("seteuid");

1343

}

1344

goto end;

1345

}

1346

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

1347

network.ifr_flags |= IFF_UP;

1348

take_down_interface = true;

1349

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

1350

if(ret == -1){

1351

take_down_interface = false;

1352

perror("ioctl SIOCSIFFLAGS");

1353

exitcode = EX_OSERR;

1354

#ifdef __linux__

1355

if(restore_loglevel){

1356

ret = klogctl(7, NULL, 0);

1357

if(ret == -1){

1358

perror("klogctl");

2264

perror_plus("sigaction");

2265

exitcode = EX_OSERR;

2266

goto end;

2267

}

2268

}

2269

2270

/* If no interfaces were specified, make a list */

2271

if(mc.interfaces == NULL){

2272

struct dirent **direntries = NULL;

2273

/* Look for any good interfaces */

2274

ret = scandir(sys_class_net, &direntries, good_interface,

2275

alphasort);

2276

if(ret >= 1){

2277

/* Add all found interfaces to interfaces list */

2278

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

2279

ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,

2280

direntries[i]->d_name);

2281

if(ret_errno != 0){

2282

errno = ret_errno;

2283

perror_plus("argz_add");

2284

free(direntries[i]);

2285

continue;

2286

}

2287

if(debug){

2288

fprintf_plus(stderr, "Will use interface \"%s\"\n",

2289

direntries[i]->d_name);

2290

}

2291

free(direntries[i]);

2292

}

2293

free(direntries);

2294

} else {

2295

if(ret == 0){

2296

free(direntries);

2297

}

2298

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

2299

exitcode = EXIT_FAILURE;

2300

goto end;

2301

}

2302

}

2303

2304

/* Bring up interfaces which are down, and remove any "none"s */

2305

{

2306

char *interface = NULL;

2307

while((interface = argz_next(mc.interfaces, mc.interfaces_size,

2308

interface))){

2309

/* If interface name is "none", stop bringing up interfaces.

2310

Also remove all instances of "none" from the list */

2311

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

2312

argz_delete(&mc.interfaces, &mc.interfaces_size,

2313

interface);

2314

interface = NULL;

2315

while((interface = argz_next(mc.interfaces,

2316

mc.interfaces_size, interface))){

2317

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

2318

argz_delete(&mc.interfaces, &mc.interfaces_size,

2319

interface);

2320

interface = NULL;

1359

2321

}

1360

2322

}

1361

#endif /* __linux__ */

1362

/* Lower privileges */

1363

errno = 0;

1364

ret = seteuid(uid);

1365

if(ret == -1){

1366

perror("seteuid");

1367

}

1368

goto end;

1369

}

1370

}

1371

/* sleep checking until interface is running */

1372

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

1373

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

1374

if(ret == -1){

1375

perror("ioctl SIOCGIFFLAGS");

1376

} else if(network.ifr_flags & IFF_RUNNING){

1377

2323

break;

1378

2324

}

1379

struct timespec sleeptime = { .tv_nsec = 250000000 };

1380

ret = nanosleep(&sleeptime, NULL);

1381

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

1382

perror("nanosleep");

1383

}

1384

}

1385

if(not take_down_interface){

1386

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

1387

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

1388

if(ret == -1){

1389

perror("close");

1390

}

1391

}

1392

#ifdef __linux__

1393

if(restore_loglevel){

1394

/* Restores kernel loglevel to default */

1395

ret = klogctl(7, NULL, 0);

1396

if(ret == -1){

1397

perror("klogctl");

1398

}

1399

}

1400

#endif /* __linux__ */

1401

/* Lower privileges */

1402

errno = 0;

1403

if(take_down_interface){

1404

/* Lower privileges */

1405

ret = seteuid(uid);

1406

if(ret == -1){

1407

perror("seteuid");

1408

}

1409

} else {

1410

/* Lower privileges permanently */

1411

ret = setuid(uid);

1412

if(ret == -1){

1413

perror("setuid");

1414

}

1415

}

2325

bool interface_was_up = interface_is_up(interface);

2326

errno = bring_up_interface(interface, delay);

2327

if(not interface_was_up){

2328

if(errno != 0){

2329

perror_plus("Failed to bring up interface");

2330

} else {

2331

errno = argz_add(&interfaces_to_take_down,

2332

&interfaces_to_take_down_size,

2333

interface);

2334

if(errno != 0){

2335

perror_plus("argz_add");

2336

}

2337

}

2338

}

2339

}

2340

if(debug and (interfaces_to_take_down == NULL)){

2341

fprintf_plus(stderr, "No interfaces were brought up\n");

2342

}

2343

}

2344

2345

/* If we only got one interface, explicitly use only that one */

2346

if(argz_count(mc.interfaces, mc.interfaces_size) == 1){

2347

if(debug){

2348

fprintf_plus(stderr, "Using only interface \"%s\"\n",

2349

mc.interfaces);

2350

}

2351

if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);

1416

2352

}

1417

2353

1418

2354

if(quit_now){

1419

2355

goto end;

1420

2356

}

1421

2357

1422

ret = init_gnutls_global(pubkey, seckey);

2358

ret = init_gnutls_global(pubkey, seckey, &mc);

1423

2359

if(ret == -1){

1424

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

2360

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

1425

2361

exitcode = EX_UNAVAILABLE;

1426

2362

goto end;

1427

2363

} else {

1432

2368

goto end;

1433

2369

}

1434

2370

1435

tempdir_created = true;

1436

if(mkdtemp(tempdir) == NULL){

1437

tempdir_created = false;

1438

perror("mkdtemp");

2371

/* Try /run/tmp before /tmp */

2372

tempdir = mkdtemp(run_tempdir);

2373

if(tempdir == NULL and errno == ENOENT){

2374

if(debug){

2375

fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",

2376

run_tempdir, old_tempdir);

2377

}

2378

tempdir = mkdtemp(old_tempdir);

2379

}

2380

if(tempdir == NULL){

2381

perror_plus("mkdtemp");

1439

2382

goto end;

1440

2383

}

1441

2384

1443

2386

goto end;

1444

2387

}

1445

2388

1446

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

1447

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

2389

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

2390

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

1448

2391

exitcode = EX_UNAVAILABLE;

1449

2392

goto end;

1450

2393

} else {

1459

2402

/* Connect directly, do not use Zeroconf */

1460

2403

/* (Mainly meant for debugging) */

1461

2404

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

2405

1462

2406

if(address == NULL){

1463

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

2407

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

1464

2408

exitcode = EX_USAGE;

1465

2409

goto end;

1466

2410

}

1469

2413

goto end;

1470

2414

}

1471

2415

1472

uint16_t port;

2416

in_port_t port;

1473

2417

errno = 0;

1474

2418

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

1475

2419

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

1476

or tmpmax != (uint16_t)tmpmax){

1477

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

2420

or tmpmax != (in_port_t)tmpmax){

2421

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

1478

2422

exitcode = EX_USAGE;

1479

2423

goto end;

1480

2424

}

1481

2425

1482

2426

if(quit_now){

1483

2427

goto end;

1484

2428

}

1485

2429

1486

port = (uint16_t)tmpmax;

2430

port = (in_port_t)tmpmax;

1487

2431

*address = '\0';

1488

address = connect_to;

1489

2432

/* Colon in address indicates IPv6 */

1490

2433

int af;

1491

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

2434

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

1492

2435

af = AF_INET6;

2436

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

2437

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

2438

{

2439

connect_to++;

2440

address[-1] = '\0';

2441

}

1493

2442

} else {

1494

2443

af = AF_INET;

1495

2444

}

2445

address = connect_to;

1496

2446

1497

2447

if(quit_now){

1498

2448

goto end;

1499

2449

}

1500

2450

1501

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

1502

if(ret < 0){

1503

switch(errno){

1504

case ENETUNREACH:

1505

case EHOSTDOWN:

1506

case EHOSTUNREACH:

1507

exitcode = EX_NOHOST;

1508

break;

1509

case EINVAL:

1510

exitcode = EX_USAGE;

1511

break;

1512

case EIO:

1513

exitcode = EX_IOERR;

1514

break;

1515

case EPROTO:

1516

exitcode = EX_PROTOCOL;

1517

break;

1518

default:

1519

exitcode = EX_OSERR;

1520

break;

1521

}

1522

} else {

2451

while(not quit_now){

2452

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

2453

&mc);

2454

if(quit_now or ret == 0){

2455

break;

2456

}

2457

if(debug){

2458

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

2459

(int)retry_interval);

2460

}

2461

sleep((unsigned int)retry_interval);

2462

}

2463

2464

if(not quit_now){

1523

2465

exitcode = EXIT_SUCCESS;

1524

2466

}

2467

1525

2468

goto end;

1526

2469

}

1527

2470

1539

2482

config.publish_domain = 0;

1540

2483

1541

2484

/* Allocate a new server */

1542

mc.server = avahi_server_new(avahi_simple_poll_get

1543

(mc.simple_poll), &config, NULL,

1544

NULL, &error);

2485

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2486

&config, NULL, NULL, &ret_errno);

1545

2487

1546

2488

/* Free the Avahi configuration data */

1547

2489

avahi_server_config_free(&config);

1549

2491

1550

2492

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

1551

2493

if(mc.server == NULL){

1552

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

1553

avahi_strerror(error));

2494

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

2495

avahi_strerror(ret_errno));

1554

2496

exitcode = EX_UNAVAILABLE;

1555

2497

goto end;

1556

2498

}

1562

2504

/* Create the Avahi service browser */

1563

2505

sb = avahi_s_service_browser_new(mc.server, if_index,

1564

2506

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1565

NULL, 0, browse_callback, NULL);

2507

NULL, 0, browse_callback,

2508

(void *)&mc);

1566

2509

if(sb == NULL){

1567

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

1568

avahi_strerror(avahi_server_errno(mc.server)));

2510

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

2511

avahi_strerror(avahi_server_errno(mc.server)));

1569

2512

exitcode = EX_UNAVAILABLE;

1570

2513

goto end;

1571

2514

}

1577

2520

/* Run the main loop */

1578

2521

1579

2522

if(debug){

1580

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

2523

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

1581

2524

}

1582

2525

1583

avahi_simple_poll_loop(mc.simple_poll);

2526

ret = avahi_loop_with_timeout(simple_poll,

2527

(int)(retry_interval * 1000), &mc);

2528

if(debug){

2529

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

2530

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

2531

}

1584

2532

1585

2533

end:

1586

2534

1587

2535

if(debug){

1588

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

2536

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

1589

2537

}

1590

2538

1591

2539

/* Cleanup things */

2540

free(mc.interfaces);

2541

1592

2542

if(sb != NULL)

1593

2543

avahi_s_service_browser_free(sb);

1594

2544

1595

2545

if(mc.server != NULL)

1596

2546

avahi_server_free(mc.server);

1597

2547

1598

if(mc.simple_poll != NULL)

1599

avahi_simple_poll_free(mc.simple_poll);

2548

if(simple_poll != NULL)

2549

avahi_simple_poll_free(simple_poll);

1600

2550

1601

2551

if(gnutls_initialized){

1602

2552

gnutls_certificate_free_credentials(mc.cred);

1608

2558

gpgme_release(mc.ctx);

1609

2559

}

1610

2560

1611

/* Take down the network interface */

1612

if(take_down_interface){

1613

/* Re-raise priviliges */

1614

errno = 0;

1615

ret = seteuid(0);

1616

if(ret == -1){

1617

perror("seteuid");

1618

}

1619

if(geteuid() == 0){

1620

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

1621

if(ret == -1){

1622

perror("ioctl SIOCGIFFLAGS");

1623

} else if(network.ifr_flags & IFF_UP) {

1624

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

1625

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

1626

if(ret == -1){

1627

perror("ioctl SIOCSIFFLAGS");

1628

}

1629

}

1630

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

1631

if(ret == -1){

1632

perror("close");

1633

}

1634

/* Lower privileges permanently */

1635

errno = 0;

1636

ret = setuid(uid);

1637

if(ret == -1){

1638

perror("setuid");

1639

}

1640

}

1641

}

1642

1643

/* Removes the temp directory used by GPGME */

1644

if(tempdir_created){

1645

DIR *d;

1646

struct dirent *direntry;

1647

d = opendir(tempdir);

1648

if(d == NULL){

1649

if(errno != ENOENT){

1650

perror("opendir");

1651

}

1652

} else {

1653

while(true){

1654

direntry = readdir(d);

1655

if(direntry == NULL){

1656

break;

1657

}

1658

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

1659

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

1660

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

1661

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

1662

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

1663

continue;

1664

}

1665

char *fullname = NULL;

1666

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

1667

direntry->d_name);

1668

if(ret < 0){

1669

perror("asprintf");

1670

continue;

1671

}

1672

ret = remove(fullname);

1673

if(ret == -1){

1674

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

1675

strerror(errno));

1676

}

1677

free(fullname);

1678

}

1679

closedir(d);

1680

}

1681

ret = rmdir(tempdir);

1682

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

1683

perror("rmdir");

2561

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

2562

has seen */

2563

if(mc.current_server != NULL){

2564

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

2565

while(mc.current_server != NULL){

2566

server *next = mc.current_server->next;

2567

#ifdef __GNUC__

2568

#pragma GCC diagnostic push

2569

#pragma GCC diagnostic ignored "-Wcast-qual"

2570

#endif

2571

free((char *)(mc.current_server->ip));

2572

#ifdef __GNUC__

2573

#pragma GCC diagnostic pop

2574

#endif

2575

free(mc.current_server);

2576

mc.current_server = next;

2577

}

2578

}

2579

2580

/* Re-raise privileges */

2581

{

2582

ret_errno = raise_privileges();

2583

if(ret_errno != 0){

2584

errno = ret_errno;

2585

perror_plus("Failed to raise privileges");

2586

} else {

2587

2588

/* Run network hooks */

2589

run_network_hooks("stop", interfaces_hooks != NULL ?

2590

interfaces_hooks : "", delay);

2591

2592

/* Take down the network interfaces which were brought up */

2593

{

2594

char *interface = NULL;

2595

while((interface=argz_next(interfaces_to_take_down,

2596

interfaces_to_take_down_size,

2597

interface))){

2598

ret_errno = take_down_interface(interface);

2599

if(ret_errno != 0){

2600

errno = ret_errno;

2601

perror_plus("Failed to take down interface");

2602

}

2603

}

2604

if(debug and (interfaces_to_take_down == NULL)){

2605

fprintf_plus(stderr, "No interfaces needed to be taken"

2606

" down\n");

2607

}

2608

}

2609

}

2610

2611

ret_errno = lower_privileges_permanently();

2612

if(ret_errno != 0){

2613

errno = ret_errno;

2614

perror_plus("Failed to lower privileges permanently");

2615

}

2616

}

2617

2618

free(interfaces_to_take_down);

2619

free(interfaces_hooks);

2620

2621

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

2622

if(tempdir != NULL){

2623

struct dirent **direntries = NULL;

2624

int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |

2625

O_NOFOLLOW));

2626

if(tempdir_fd == -1){

2627

perror_plus("open");

2628

} else {

2629

#ifdef __GLIBC__

2630

#if __GLIBC_PREREQ(2, 15)

2631

int numentries = scandirat(tempdir_fd, ".", &direntries,

2632

notdotentries, alphasort);

2633

#else /* not __GLIBC_PREREQ(2, 15) */

2634

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

2635

alphasort);

2636

#endif /* not __GLIBC_PREREQ(2, 15) */

2637

#else /* not __GLIBC__ */

2638

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

2639

alphasort);

2640

#endif /* not __GLIBC__ */

2641

if(numentries >= 0){

2642

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

2643

ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);

2644

if(ret == -1){

2645

fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"

2646

" \"%s\", 0): %s\n", tempdir,

2647

direntries[i]->d_name, strerror(errno));

2648

}

2649

free(direntries[i]);

2650

}

2651

2652

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

2653

free(direntries);

2654

if(numentries == -1){

2655

perror_plus("scandir");

2656

}

2657

ret = rmdir(tempdir);

2658

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

2659

perror_plus("rmdir");

2660

}

2661

}

2662

TEMP_FAILURE_RETRY(close(tempdir_fd));

1684

2663

}

1685

2664

}

1686

2665

1691

2670

&old_sigterm_action,

1692

2671

NULL));

1693

2672

if(ret == -1){

1694

perror("sigaction");

2673

perror_plus("sigaction");

1695

2674

}

1696

2675

do {

1697

2676

ret = raise(signal_received);

1698

2677

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

1699

2678

if(ret != 0){

1700

perror("raise");

2679

perror_plus("raise");

1701

2680

abort();

1702

2681

}

1703

2682

TEMP_FAILURE_RETRY(pause());