/mandos/release : revision 237.7.20

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

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*

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* Everything else is

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*

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

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

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* along with this program. If not, see

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

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*

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

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

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*/

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

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#ifndef _LARGEFILE_SOURCE

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#define _LARGEFILE_SOURCE

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#endif /* not _LARGEFILE_SOURCE */

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#endif

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#ifndef _FILE_OFFSET_BITS

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#define _FILE_OFFSET_BITS 64

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#endif /* not _FILE_OFFSET_BITS */

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#endif

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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() */

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

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stdout, ferror(), remove() */

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

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

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

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strtof(), abort() */

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#include <stdbool.h> /* bool, false, true */

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#include <string.h> /* strcmp(), strlen(), strerror(),

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asprintf(), strncpy() */

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#include <string.h> /* memset(), strcmp(), strlen(),

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strerror(), asprintf(), strcpy() */

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#include <sys/ioctl.h> /* ioctl */

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#include <sys/types.h> /* socket(), inet_pton(), sockaddr,

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sockaddr_in6, PF_INET6,

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SOCK_STREAM, uid_t, gid_t, open(),

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opendir(), DIR */

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

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

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

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inet_pton(), connect(),

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getnameinfo() */

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

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inet_pton(), connect() */

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

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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 <errno.h> /* perror(), errno, EINTR, EINVAL,

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EAI_SYSTEM, ENETUNREACH,

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EHOSTUNREACH, ECONNREFUSED, EPROTO,

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EIO, ENOENT, ENXIO, ENOMEM, EISDIR,

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ENOTEMPTY,

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program_invocation_short_name */

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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(), 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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*/

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

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

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setgid(), pause(), _exit(),

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unlinkat() */

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

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setgid(), pause() */

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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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107

init_gnutls_session(),

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108

GNUTLS_* */

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#include <gnutls/openpgp.h>

125

/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* GPGME */

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

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122

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

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#define SECKEY "seckey.txt"

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#define PUBKEY "pubkey.txt"

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

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bool debug = false;

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static const char mandos_protocol_version[] = "1";

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

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

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const char *argp_program_bug_address = "<mandos@fukt.bsnet.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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/* 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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AvahiServer *server;

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gnutls_certificate_credentials_t cred;

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138

unsigned int dh_bits;

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gnutls_dh_params_t dh_params;

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const char *priority;

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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;

175

142

} mandos_context;

176

143

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/* global so signal handler can reach it*/

178

AvahiSimplePoll *simple_poll;

144

/* 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"

147

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

179

148

180

149

sig_atomic_t quit_now = 0;

181

150

int signal_received = 0;

182

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183

/* Function to use when printing errors */

184

void perror_plus(const char *print_text){

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int e = errno;

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

187

program_invocation_short_name);

188

errno = e;

189

perror(print_text);

190

}

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192

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

193

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

194

va_list ap;

195

va_start (ap, format);

196

197

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

198

program_invocation_short_name));

199

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

200

}

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202

152

/*

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

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

205

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* "buffer_length" is how much is already used.

206

156

*/

207

__attribute__((nonnull, warn_unused_result))

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157

size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

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size_t buffer_capacity){

210

159

if(buffer_length + BUFFER_SIZE > buffer_capacity){

211

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

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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;

160

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

161

if(buffer == NULL){

217

162

return 0;

218

163

}

219

*buffer = new_buf;

220

164

buffer_capacity += BUFFER_SIZE;

221

165

}

222

166

return buffer_capacity;

223

167

}

224

168

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

226

__attribute__((nonnull, warn_unused_result))

227

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

228

int af, server **current_server){

229

int ret;

230

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

231

if(new_server == NULL){

232

perror_plus("malloc");

233

return false;

234

}

235

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

236

.port = port,

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.if_index = if_index,

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.af = af };

239

if(new_server->ip == NULL){

240

perror_plus("strdup");

241

free(new_server);

242

return false;

243

}

244

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

245

if(ret == -1){

246

perror_plus("clock_gettime");

247

#ifdef __GNUC__

248

#pragma GCC diagnostic push

249

#pragma GCC diagnostic ignored "-Wcast-qual"

250

#endif

251

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

252

#ifdef __GNUC__

253

#pragma GCC diagnostic pop

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#endif

255

free(new_server);

256

return false;

257

}

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/* Special case of first server */

259

if(*current_server == NULL){

260

new_server->next = new_server;

261

new_server->prev = new_server;

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*current_server = new_server;

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} else {

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

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new_server->next = *current_server;

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

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new_server->prev->next = new_server;

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(*current_server)->prev = new_server;

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}

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return true;

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}

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/*

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* Initialize GPGME.

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171

*/

276

__attribute__((nonnull, warn_unused_result))

277

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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static bool init_gpgme(const char *seckey,

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const char *pubkey, const char *tempdir){

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gpgme_error_t rc;

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gpgme_engine_info_t engine_info;

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/*

285

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

286

180

*/

287

bool import_key(const char * const filename){

181

bool import_key(const char *filename){

288

182

int ret;

289

183

int fd;

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184

gpgme_data_t pgp_data;

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

293

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if(fd == -1){

294

perror_plus("open");

188

perror("open");

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return false;

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190

}

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

299

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if(rc != GPG_ERR_NO_ERROR){

300

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

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gpgme_strsource(rc), gpgme_strerror(rc));

194

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

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gpgme_strsource(rc), gpgme_strerror(rc));

302

196

return false;

303

197

}

304

198

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

199

rc = gpgme_op_import(mc.ctx, pgp_data);

306

200

if(rc != GPG_ERR_NO_ERROR){

307

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

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gpgme_strsource(rc), gpgme_strerror(rc));

201

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

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gpgme_strsource(rc), gpgme_strerror(rc));

309

203

return false;

310

204

}

311

205

312

ret = close(fd);

206

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

313

207

if(ret == -1){

314

perror_plus("close");

208

perror("close");

315

209

}

316

210

gpgme_data_release(pgp_data);

317

211

return true;

318

212

}

319

213

320

214

if(debug){

321

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

215

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

322

216

}

323

217

324

218

/* Init GPGME */

325

219

gpgme_check_version(NULL);

326

220

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

327

221

if(rc != GPG_ERR_NO_ERROR){

328

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

329

gpgme_strsource(rc), gpgme_strerror(rc));

222

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

223

gpgme_strsource(rc), gpgme_strerror(rc));

330

224

return false;

331

225

}

332

226

333

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

227

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

334

228

rc = gpgme_get_engine_info(&engine_info);

335

229

if(rc != GPG_ERR_NO_ERROR){

336

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

337

gpgme_strsource(rc), gpgme_strerror(rc));

230

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

231

gpgme_strsource(rc), gpgme_strerror(rc));

338

232

return false;

339

233

}

340

234

while(engine_info != NULL){

346

240

engine_info = engine_info->next;

347

241

}

348

242

if(engine_info == NULL){

349

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

350

tempdir);

243

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

351

244

return false;

352

245

}

353

246

354

247

/* Create new GPGME "context" */

355

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

248

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

356

249

if(rc != GPG_ERR_NO_ERROR){

357

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

358

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

359

gpgme_strerror(rc));

250

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

251

gpgme_strsource(rc), gpgme_strerror(rc));

360

252

return false;

361

253

}

362

254

371

263

* Decrypt OpenPGP data.

372

264

* Returns -1 on error

373

265

*/

374

__attribute__((nonnull, warn_unused_result))

375

266

static ssize_t pgp_packet_decrypt(const char *cryptotext,

376

267

size_t crypto_size,

377

char **plaintext,

378

mandos_context *mc){

268

char **plaintext){

379

269

gpgme_data_t dh_crypto, dh_plain;

380

270

gpgme_error_t rc;

381

271

ssize_t ret;

383

273

ssize_t plaintext_length = 0;

384

274

385

275

if(debug){

386

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

276

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

387

277

}

388

278

389

279

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

390

280

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

391

281

0);

392

282

if(rc != GPG_ERR_NO_ERROR){

393

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

394

gpgme_strsource(rc), gpgme_strerror(rc));

283

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

284

gpgme_strsource(rc), gpgme_strerror(rc));

395

285

return -1;

396

286

}

397

287

398

288

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

399

289

rc = gpgme_data_new(&dh_plain);

400

290

if(rc != GPG_ERR_NO_ERROR){

401

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

402

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

403

gpgme_strsource(rc), gpgme_strerror(rc));

291

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

292

gpgme_strsource(rc), gpgme_strerror(rc));

404

293

gpgme_data_release(dh_crypto);

405

294

return -1;

406

295

}

407

296

408

297

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

409

298

data buffer */

410

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

299

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

411

300

if(rc != GPG_ERR_NO_ERROR){

412

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

413

gpgme_strsource(rc), gpgme_strerror(rc));

301

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

302

gpgme_strsource(rc), gpgme_strerror(rc));

414

303

plaintext_length = -1;

415

304

if(debug){

416

305

gpgme_decrypt_result_t result;

417

result = gpgme_op_decrypt_result(mc->ctx);

306

result = gpgme_op_decrypt_result(mc.ctx);

418

307

if(result == NULL){

419

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

308

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

420

309

} else {

421

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

422

result->unsupported_algorithm);

423

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

424

result->wrong_key_usage);

310

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

311

result->unsupported_algorithm);

312

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

313

result->wrong_key_usage);

425

314

if(result->file_name != NULL){

426

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

315

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

427

316

}

428

317

gpgme_recipient_t recipient;

429

318

recipient = result->recipients;

430

319

while(recipient != NULL){

431

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

432

gpgme_pubkey_algo_name

433

(recipient->pubkey_algo));

434

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

435

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

436

recipient->status == GPG_ERR_NO_SECKEY

437

? "No" : "Yes");

320

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

321

gpgme_pubkey_algo_name(recipient->pubkey_algo));

322

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

323

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

324

recipient->status == GPG_ERR_NO_SECKEY

325

? "No" : "Yes");

438

326

recipient = recipient->next;

439

327

}

440

328

}

443

331

}

444

332

445

333

if(debug){

446

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

334

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

447

335

}

448

336

449

337

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

450

338

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

451

perror_plus("gpgme_data_seek");

339

perror("gpgme_data_seek");

452

340

plaintext_length = -1;

453

341

goto decrypt_end;

454

342

}

456

344

*plaintext = NULL;

457

345

while(true){

458

346

plaintext_capacity = incbuffer(plaintext,

459

(size_t)plaintext_length,

460

plaintext_capacity);

347

(size_t)plaintext_length,

348

plaintext_capacity);

461

349

if(plaintext_capacity == 0){

462

perror_plus("incbuffer");

463

plaintext_length = -1;

464

goto decrypt_end;

350

perror("incbuffer");

351

plaintext_length = -1;

352

goto decrypt_end;

465

353

}

466

354

467

355

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

472

360

break;

473

361

}

474

362

if(ret < 0){

475

perror_plus("gpgme_data_read");

363

perror("gpgme_data_read");

476

364

plaintext_length = -1;

477

365

goto decrypt_end;

478

366

}

480

368

}

481

369

482

370

if(debug){

483

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

371

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

484

372

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

485

373

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

486

374

}

497

385

return plaintext_length;

498

386

}

499

387

500

__attribute__((warn_unused_result, const))

501

static const char *safe_string(const char *str){

502

if(str == NULL)

503

return "(unknown)";

504

return str;

505

}

506

507

__attribute__((warn_unused_result))

508

static const char *safer_gnutls_strerror(int value){

509

const char *ret = gnutls_strerror(value);

510

return safe_string(ret);

388

static const char * safer_gnutls_strerror(int value){

389

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

390

-Wunreachable-code */

391

if(ret == NULL)

392

ret = "(unknown)";

393

return ret;

511

394

}

512

395

513

396

/* GnuTLS log function callback */

514

__attribute__((nonnull))

515

397

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

516

398

const char* string){

517

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

399

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

518

400

}

519

401

520

__attribute__((nonnull(1, 2, 4), warn_unused_result))

521

402

static int init_gnutls_global(const char *pubkeyfilename,

522

const char *seckeyfilename,

523

const char *dhparamsfilename,

524

mandos_context *mc){

403

const char *seckeyfilename){

525

404

int ret;

526

unsigned int uret;

527

405

528

406

if(debug){

529

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

407

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

408

}

409

410

ret = gnutls_global_init();

411

if(ret != GNUTLS_E_SUCCESS){

412

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

413

safer_gnutls_strerror(ret));

414

return -1;

530

415

}

531

416

532

417

if(debug){

538

423

}

539

424

540

425

/* OpenPGP credentials */

541

ret = gnutls_certificate_allocate_credentials(&mc->cred);

426

gnutls_certificate_allocate_credentials(&mc.cred);

542

427

if(ret != GNUTLS_E_SUCCESS){

543

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

544

safer_gnutls_strerror(ret));

428

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

429

from

430

-Wunreachable-code

431

*/

432

safer_gnutls_strerror(ret));

433

gnutls_global_deinit();

545

434

return -1;

546

435

}

547

436

548

437

if(debug){

549

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

550

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

551

pubkeyfilename,

552

seckeyfilename);

438

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

439

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

440

seckeyfilename);

553

441

}

554

442

555

443

ret = gnutls_certificate_set_openpgp_key_file

556

(mc->cred, pubkeyfilename, seckeyfilename,

444

(mc.cred, pubkeyfilename, seckeyfilename,

557

445

GNUTLS_OPENPGP_FMT_BASE64);

558

446

if(ret != GNUTLS_E_SUCCESS){

559

fprintf_plus(stderr,

560

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

561

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

562

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

563

safer_gnutls_strerror(ret));

447

fprintf(stderr,

448

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

449

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

450

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

451

safer_gnutls_strerror(ret));

564

452

goto globalfail;

565

453

}

566

454

567

455

/* GnuTLS server initialization */

568

ret = gnutls_dh_params_init(&mc->dh_params);

569

if(ret != GNUTLS_E_SUCCESS){

570

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

571

" initialization: %s\n",

572

safer_gnutls_strerror(ret));

573

goto globalfail;

574

}

575

/* If a Diffie-Hellman parameters file was given, try to use it */

576

if(dhparamsfilename != NULL){

577

gnutls_datum_t params = { .data = NULL, .size = 0 };

578

do {

579

int dhpfile = open(dhparamsfilename, O_RDONLY);

580

if(dhpfile == -1){

581

perror_plus("open");

582

dhparamsfilename = NULL;

583

break;

584

}

585

size_t params_capacity = 0;

586

while(true){

587

params_capacity = incbuffer((char **)&params.data,

588

(size_t)params.size,

589

(size_t)params_capacity);

590

if(params_capacity == 0){

591

perror_plus("incbuffer");

592

free(params.data);

593

params.data = NULL;

594

dhparamsfilename = NULL;

595

break;

596

}

597

ssize_t bytes_read = read(dhpfile,

598

params.data + params.size,

599

BUFFER_SIZE);

600

/* EOF */

601

if(bytes_read == 0){

602

break;

603

}

604

/* check bytes_read for failure */

605

if(bytes_read < 0){

606

perror_plus("read");

607

free(params.data);

608

params.data = NULL;

609

dhparamsfilename = NULL;

610

break;

611

}

612

params.size += (unsigned int)bytes_read;

613

}

614

if(params.data == NULL){

615

dhparamsfilename = NULL;

616

}

617

if(dhparamsfilename == NULL){

618

break;

619

}

620

ret = gnutls_dh_params_import_pkcs3(mc->dh_params, &params,

621

GNUTLS_X509_FMT_PEM);

622

if(ret != GNUTLS_E_SUCCESS){

623

fprintf_plus(stderr, "Failed to parse DH parameters in file"

624

" \"%s\": %s\n", dhparamsfilename,

625

safer_gnutls_strerror(ret));

626

dhparamsfilename = NULL;

627

}

628

} while(false);

629

}

630

if(dhparamsfilename == NULL){

631

if(mc->dh_bits == 0){

632

/* Find out the optimal number of DH bits */

633

/* Try to read the private key file */

634

gnutls_datum_t buffer = { .data = NULL, .size = 0 };

635

do {

636

int secfile = open(seckeyfilename, O_RDONLY);

637

if(secfile == -1){

638

perror_plus("open");

639

break;

640

}

641

size_t buffer_capacity = 0;

642

while(true){

643

buffer_capacity = incbuffer((char **)&buffer.data,

644

(size_t)buffer.size,

645

(size_t)buffer_capacity);

646

if(buffer_capacity == 0){

647

perror_plus("incbuffer");

648

free(buffer.data);

649

buffer.data = NULL;

650

break;

651

}

652

ssize_t bytes_read = read(secfile,

653

buffer.data + buffer.size,

654

BUFFER_SIZE);

655

/* EOF */

656

if(bytes_read == 0){

657

break;

658

}

659

/* check bytes_read for failure */

660

if(bytes_read < 0){

661

perror_plus("read");

662

free(buffer.data);

663

buffer.data = NULL;

664

break;

665

}

666

buffer.size += (unsigned int)bytes_read;

667

}

668

close(secfile);

669

} while(false);

670

/* If successful, use buffer to parse private key */

671

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

672

if(buffer.data != NULL){

673

{

674

gnutls_openpgp_privkey_t privkey = NULL;

675

ret = gnutls_openpgp_privkey_init(&privkey);

676

if(ret != GNUTLS_E_SUCCESS){

677

fprintf_plus(stderr, "Error initializing OpenPGP key"

678

" structure: %s",

679

safer_gnutls_strerror(ret));

680

free(buffer.data);

681

buffer.data = NULL;

682

} else {

683

ret = gnutls_openpgp_privkey_import

684

(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);

685

if(ret != GNUTLS_E_SUCCESS){

686

fprintf_plus(stderr, "Error importing OpenPGP key : %s",

687

safer_gnutls_strerror(ret));

688

privkey = NULL;

689

}

690

free(buffer.data);

691

buffer.data = NULL;

692

if(privkey != NULL){

693

/* Use private key to suggest an appropriate

694

sec_param */

695

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

696

gnutls_openpgp_privkey_deinit(privkey);

697

if(debug){

698

fprintf_plus(stderr, "This OpenPGP key implies using"

699

" a GnuTLS security parameter \"%s\".\n",

700

safe_string(gnutls_sec_param_get_name

701

(sec_param)));

702

}

703

}

704

}

705

}

706

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

707

/* Err on the side of caution */

708

sec_param = GNUTLS_SEC_PARAM_ULTRA;

709

if(debug){

710

fprintf_plus(stderr, "Falling back to security parameter"

711

" \"%s\"\n",

712

safe_string(gnutls_sec_param_get_name

713

(sec_param)));

714

}

715

}

716

}

717

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

718

if(uret != 0){

719

mc->dh_bits = uret;

720

if(debug){

721

fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"

722

" implies %u DH bits; using that.\n",

723

safe_string(gnutls_sec_param_get_name

724

(sec_param)),

725

mc->dh_bits);

726

}

727

} else {

728

fprintf_plus(stderr, "Failed to get implied number of DH"

729

" bits for security parameter \"%s\"): %s\n",

730

safe_string(gnutls_sec_param_get_name

731

(sec_param)),

732

safer_gnutls_strerror(ret));

733

goto globalfail;

734

}

735

} else if(debug){

736

fprintf_plus(stderr, "DH bits explicitly set to %u\n",

737

mc->dh_bits);

738

}

739

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

740

if(ret != GNUTLS_E_SUCCESS){

741

fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"

742

" bits): %s\n", mc->dh_bits,

743

safer_gnutls_strerror(ret));

744

goto globalfail;

745

}

746

}

747

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

456

ret = gnutls_dh_params_init(&mc.dh_params);

457

if(ret != GNUTLS_E_SUCCESS){

458

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

459

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

460

goto globalfail;

461

}

462

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

463

if(ret != GNUTLS_E_SUCCESS){

464

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

465

safer_gnutls_strerror(ret));

466

goto globalfail;

467

}

468

469

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

748

470

749

471

return 0;

750

472

751

473

globalfail:

752

474

753

gnutls_certificate_free_credentials(mc->cred);

754

gnutls_dh_params_deinit(mc->dh_params);

475

gnutls_certificate_free_credentials(mc.cred);

476

gnutls_global_deinit();

477

gnutls_dh_params_deinit(mc.dh_params);

755

478

return -1;

756

479

}

757

480

758

__attribute__((nonnull, warn_unused_result))

759

static int init_gnutls_session(gnutls_session_t *session,

760

mandos_context *mc){

481

static int init_gnutls_session(gnutls_session_t *session){

761

482

int ret;

762

483

/* GnuTLS session creation */

763

484

do {

767

488

}

768

489

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

769

490

if(ret != GNUTLS_E_SUCCESS){

770

fprintf_plus(stderr,

771

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

772

safer_gnutls_strerror(ret));

491

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

492

safer_gnutls_strerror(ret));

773

493

}

774

494

775

495

{

776

496

const char *err;

777

497

do {

778

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

498

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

779

499

if(quit_now){

780

500

gnutls_deinit(*session);

781

501

return -1;

782

502

}

783

503

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

784

504

if(ret != GNUTLS_E_SUCCESS){

785

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

786

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

787

safer_gnutls_strerror(ret));

505

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

506

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

507

safer_gnutls_strerror(ret));

788

508

gnutls_deinit(*session);

789

509

return -1;

790

510

}

792

512

793

513

do {

794

514

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

795

mc->cred);

515

mc.cred);

796

516

if(quit_now){

797

517

gnutls_deinit(*session);

798

518

return -1;

799

519

}

800

520

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

801

521

if(ret != GNUTLS_E_SUCCESS){

802

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

803

safer_gnutls_strerror(ret));

522

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

523

safer_gnutls_strerror(ret));

804

524

gnutls_deinit(*session);

805

525

return -1;

806

526

}

808

528

/* ignore client certificate if any. */

809

529

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

810

530

531

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

532

811

533

return 0;

812

534

}

813

535

815

537

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

816

538

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

817

539

818

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

819

__attribute__((warn_unused_result))

820

error_t raise_privileges(void){

821

error_t old_errno = errno;

822

error_t ret_errno = 0;

823

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

824

ret_errno = errno;

825

}

826

errno = old_errno;

827

return ret_errno;

828

}

829

830

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

831

__attribute__((warn_unused_result))

832

error_t raise_privileges_permanently(void){

833

error_t old_errno = errno;

834

error_t ret_errno = raise_privileges();

835

if(ret_errno != 0){

836

errno = old_errno;

837

return ret_errno;

838

}

839

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

840

ret_errno = errno;

841

}

842

errno = old_errno;

843

return ret_errno;

844

}

845

846

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

847

__attribute__((warn_unused_result))

848

error_t lower_privileges(void){

849

error_t old_errno = errno;

850

error_t ret_errno = 0;

851

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

852

ret_errno = errno;

853

}

854

errno = old_errno;

855

return ret_errno;

856

}

857

858

/* Lower privileges permanently */

859

__attribute__((warn_unused_result))

860

error_t lower_privileges_permanently(void){

861

error_t old_errno = errno;

862

error_t ret_errno = 0;

863

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

864

ret_errno = errno;

865

}

866

errno = old_errno;

867

return ret_errno;

868

}

869

870

/* Helper function to add_local_route() and delete_local_route() */

871

__attribute__((nonnull, warn_unused_result))

872

static bool add_delete_local_route(const bool add,

873

const char *address,

874

AvahiIfIndex if_index){

875

int ret;

876

char helper[] = "mandos-client-iprouteadddel";

877

char add_arg[] = "add";

878

char delete_arg[] = "delete";

879

char debug_flag[] = "--debug";

880

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

881

if(pluginhelperdir == NULL){

882

if(debug){

883

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

884

" variable not set; cannot run helper\n");

885

}

886

return false;

887

}

888

889

char interface[IF_NAMESIZE];

890

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

891

perror_plus("if_indextoname");

892

return false;

893

}

894

895

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

896

if(devnull == -1){

897

perror_plus("open(\"/dev/null\", O_RDONLY)");

898

return false;

899

}

900

pid_t pid = fork();

901

if(pid == 0){

902

/* Child */

903

/* Raise privileges */

904

errno = raise_privileges_permanently();

905

if(errno != 0){

906

perror_plus("Failed to raise privileges");

907

/* _exit(EX_NOPERM); */

908

} else {

909

/* Set group */

910

errno = 0;

911

ret = setgid(0);

912

if(ret == -1){

913

perror_plus("setgid");

914

_exit(EX_NOPERM);

915

}

916

/* Reset supplementary groups */

917

errno = 0;

918

ret = setgroups(0, NULL);

919

if(ret == -1){

920

perror_plus("setgroups");

921

_exit(EX_NOPERM);

922

}

923

}

924

ret = dup2(devnull, STDIN_FILENO);

925

if(ret == -1){

926

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

927

_exit(EX_OSERR);

928

}

929

ret = close(devnull);

930

if(ret == -1){

931

perror_plus("close");

932

_exit(EX_OSERR);

933

}

934

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

935

if(ret == -1){

936

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

937

_exit(EX_OSERR);

938

}

939

int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,

940

O_RDONLY

941

| O_DIRECTORY

942

| O_PATH

943

| O_CLOEXEC));

944

if(helperdir_fd == -1){

945

perror_plus("open");

946

_exit(EX_UNAVAILABLE);

947

}

948

int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,

949

helper, O_RDONLY));

950

if(helper_fd == -1){

951

perror_plus("openat");

952

close(helperdir_fd);

953

_exit(EX_UNAVAILABLE);

954

}

955

close(helperdir_fd);

956

#ifdef __GNUC__

957

#pragma GCC diagnostic push

958

#pragma GCC diagnostic ignored "-Wcast-qual"

959

#endif

960

if(fexecve(helper_fd, (char *const [])

961

{ helper, add ? add_arg : delete_arg, (char *)address,

962

interface, debug ? debug_flag : NULL, NULL },

963

environ) == -1){

964

#ifdef __GNUC__

965

#pragma GCC diagnostic pop

966

#endif

967

perror_plus("fexecve");

968

_exit(EXIT_FAILURE);

969

}

970

}

971

if(pid == -1){

972

perror_plus("fork");

973

return false;

974

}

975

int status;

976

pid_t pret = -1;

977

errno = 0;

978

do {

979

pret = waitpid(pid, &status, 0);

980

if(pret == -1 and errno == EINTR and quit_now){

981

int errno_raising = 0;

982

if((errno = raise_privileges()) != 0){

983

errno_raising = errno;

984

perror_plus("Failed to raise privileges in order to"

985

" kill helper program");

986

}

987

if(kill(pid, SIGTERM) == -1){

988

perror_plus("kill");

989

}

990

if((errno_raising == 0) and (errno = lower_privileges()) != 0){

991

perror_plus("Failed to lower privileges after killing"

992

" helper program");

993

}

994

return false;

995

}

996

} while(pret == -1 and errno == EINTR);

997

if(pret == -1){

998

perror_plus("waitpid");

999

return false;

1000

}

1001

if(WIFEXITED(status)){

1002

if(WEXITSTATUS(status) != 0){

1003

fprintf_plus(stderr, "Error: iprouteadddel exited"

1004

" with status %d\n", WEXITSTATUS(status));

1005

return false;

1006

}

1007

return true;

1008

}

1009

if(WIFSIGNALED(status)){

1010

fprintf_plus(stderr, "Error: iprouteadddel died by"

1011

" signal %d\n", WTERMSIG(status));

1012

return false;

1013

}

1014

fprintf_plus(stderr, "Error: iprouteadddel crashed\n");

1015

return false;

1016

}

1017

1018

__attribute__((nonnull, warn_unused_result))

1019

static bool add_local_route(const char *address,

1020

AvahiIfIndex if_index){

1021

if(debug){

1022

fprintf_plus(stderr, "Adding route to %s\n", address);

1023

}

1024

return add_delete_local_route(true, address, if_index);

1025

}

1026

1027

__attribute__((nonnull, warn_unused_result))

1028

static bool delete_local_route(const char *address,

1029

AvahiIfIndex if_index){

1030

if(debug){

1031

fprintf_plus(stderr, "Removing route to %s\n", address);

1032

}

1033

return add_delete_local_route(false, address, if_index);

1034

}

1035

1036

540

/* Called when a Mandos server is found */

1037

__attribute__((nonnull, warn_unused_result))

1038

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

541

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

1039

542

AvahiIfIndex if_index,

1040

int af, mandos_context *mc){

543

int af){

1041

544

int ret, tcp_sd = -1;

1042

545

ssize_t sret;

1043

struct sockaddr_storage to;

546

union {

547

struct sockaddr_in in;

548

struct sockaddr_in6 in6;

549

} to;

1044

550

char *buffer = NULL;

1045

551

char *decrypted_buffer = NULL;

1046

552

size_t buffer_length = 0;

1049

555

int retval = -1;

1050

556

gnutls_session_t session;

1051

557

int pf; /* Protocol family */

1052

bool route_added = false;

1053

558

1054

559

errno = 0;

1055

560

1066

571

pf = PF_INET;

1067

572

break;

1068

573

default:

1069

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

574

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

1070

575

errno = EINVAL;

1071

576

return -1;

1072

577

}

1073

578

1074

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

1075

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

1076

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

1077

bool match = false;

1078

{

1079

char *interface = NULL;

1080

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

1081

interface))){

1082

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

1083

match = true;

1084

break;

1085

}

1086

}

1087

}

1088

if(not match){

1089

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

1090

connect to the server */

1091

if(debug){

1092

char interface[IF_NAMESIZE];

1093

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

1094

perror_plus("if_indextoname");

1095

} else {

1096

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

1097

" \"%s\"\n",

1098

if_indextoname((unsigned int)if_index,

1099

interface));

1100

}

1101

}

1102

return -1;

1103

}

1104

}

1105

1106

ret = init_gnutls_session(&session, mc);

579

ret = init_gnutls_session(&session);

1107

580

if(ret != 0){

1108

581

return -1;

1109

582

}

1110

583

1111

584

if(debug){

1112

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

1113

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

585

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

586

"\n", ip, port);

1114

587

}

1115

588

1116

tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);

589

tcp_sd = socket(pf, SOCK_STREAM, 0);

1117

590

if(tcp_sd < 0){

1118

591

int e = errno;

1119

perror_plus("socket");

592

perror("socket");

1120

593

errno = e;

1121

594

goto mandos_end;

1122

595

}

1126

599

goto mandos_end;

1127

600

}

1128

601

602

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

1129

603

if(af == AF_INET6){

1130

struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;

1131

*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };

1132

ret = inet_pton(af, ip, &to6->sin6_addr);

604

to.in6.sin6_family = (sa_family_t)af;

605

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

1133

606

} else { /* IPv4 */

1134

struct sockaddr_in *to4 = (struct sockaddr_in *)&to;

1135

*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };

1136

ret = inet_pton(af, ip, &to4->sin_addr);

607

to.in.sin_family = (sa_family_t)af;

608

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

1137

609

}

1138

610

if(ret < 0 ){

1139

611

int e = errno;

1140

perror_plus("inet_pton");

612

perror("inet_pton");

1141

613

errno = e;

1142

614

goto mandos_end;

1143

615

}

1144

616

if(ret == 0){

1145

617

int e = errno;

1146

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

618

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

1147

619

errno = e;

1148

620

goto mandos_end;

1149

621

}

1150

622

if(af == AF_INET6){

1151

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

1152

if(IN6_IS_ADDR_LINKLOCAL

1153

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

623

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

624

-Wconversion and

625

-Wunreachable-code */

626

627

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

628

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

629

-Wunreachable-code*/

1154

630

if(if_index == AVAHI_IF_UNSPEC){

1155

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

1156

" incomplete without a network interface\n");

631

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

632

" without a network interface\n");

1157

633

errno = EINVAL;

1158

634

goto mandos_end;

1159

635

}

1160

636

/* Set the network interface number as scope */

1161

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

637

to.in6.sin6_scope_id = (uint32_t)if_index;

1162

638

}

1163

639

} else {

1164

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

640

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

641

-Wconversion and

642

-Wunreachable-code */

1165

643

}

1166

644

1167

645

if(quit_now){

1173

651

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

1174

652

char interface[IF_NAMESIZE];

1175

653

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

1176

perror_plus("if_indextoname");

654

perror("if_indextoname");

1177

655

} else {

1178

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

1179

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

656

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

657

ip, interface, port);

1180

658

}

1181

659

} else {

1182

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

1183

ip, (uintmax_t)port);

660

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

661

port);

1184

662

}

1185

663

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

1186

664

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

1187

if(af == AF_INET6){

1188

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

1189

sizeof(struct sockaddr_in6),

1190

addrstr, sizeof(addrstr), NULL, 0,

1191

NI_NUMERICHOST);

1192

} else {

1193

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

1194

sizeof(struct sockaddr_in),

1195

addrstr, sizeof(addrstr), NULL, 0,

1196

NI_NUMERICHOST);

1197

}

1198

if(ret == EAI_SYSTEM){

1199

perror_plus("getnameinfo");

1200

} else if(ret != 0) {

1201

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

1202

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

1203

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

1204

}

1205

}

1206

1207

if(quit_now){

1208

errno = EINTR;

1209

goto mandos_end;

1210

}

1211

1212

while(true){

1213

if(af == AF_INET6){

1214

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

1215

sizeof(struct sockaddr_in6));

1216

} else {

1217

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

1218

sizeof(struct sockaddr_in));

1219

}

1220

if(ret < 0){

1221

if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))

1222

and if_index != AVAHI_IF_UNSPEC

1223

and connect_to == NULL

1224

and not route_added and

1225

((af == AF_INET6 and not

1226

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1227

&to)->sin6_addr)))

1228

or (af == AF_INET and

1229

/* Not a a IPv4LL address */

1230

(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)

1231

& 0xFFFF0000L) != 0xA9FE0000L))){

1232

/* Work around Avahi bug - Avahi does not announce link-local

1233

addresses if it has a global address, so local hosts with

1234

*only* a link-local address (e.g. Mandos clients) cannot

1235

connect to a Mandos server announced by Avahi on a server

1236

host with a global address. Work around this by retrying

1237

with an explicit route added with the server's address.

1238

1239

Avahi bug reference:

1240

http://lists.freedesktop.org/archives/avahi/2010-February/001833.html

1241

https://bugs.debian.org/587961

1242

*/

1243

if(debug){

1244

fprintf_plus(stderr, "Mandos server unreachable, trying"

1245

" direct route\n");

1246

}

1247

int e = errno;

1248

route_added = add_local_route(ip, if_index);

1249

if(route_added){

1250

continue;

1251

}

1252

errno = e;

1253

}

1254

if(errno != ECONNREFUSED or debug){

1255

int e = errno;

1256

perror_plus("connect");

1257

errno = e;

1258

}

1259

goto mandos_end;

1260

}

1261

1262

if(quit_now){

1263

errno = EINTR;

1264

goto mandos_end;

1265

}

1266

break;

665

const char *pcret;

666

if(af == AF_INET6){

667

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

668

sizeof(addrstr));

669

} else {

670

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

671

sizeof(addrstr));

672

}

673

if(pcret == NULL){

674

perror("inet_ntop");

675

} else {

676

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

677

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

678

}

679

}

680

}

681

682

if(quit_now){

683

errno = EINTR;

684

goto mandos_end;

685

}

686

687

if(af == AF_INET6){

688

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

689

} else {

690

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

691

}

692

if(ret < 0){

693

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

694

int e = errno;

695

perror("connect");

696

errno = e;

697

}

698

goto mandos_end;

699

}

700

701

if(quit_now){

702

errno = EINTR;

703

goto mandos_end;

1267

704

}

1268

705

1269

706

const char *out = mandos_protocol_version;

1271

708

while(true){

1272

709

size_t out_size = strlen(out);

1273

710

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

1274

out_size - written));

711

out_size - written));

1275

712

if(ret == -1){

1276

713

int e = errno;

1277

perror_plus("write");

714

perror("write");

1278

715

errno = e;

1279

716

goto mandos_end;

1280

717

}

1297

734

}

1298

735

1299

736

if(debug){

1300

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

737

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

1301

738

}

1302

739

1303

740

if(quit_now){

1305

742

goto mandos_end;

1306

743

}

1307

744

1308

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

1309

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

1310

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

1311

gnutls_transport_set_ptr(session,

1312

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

745

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

1313

746

1314

747

if(quit_now){

1315

748

errno = EINTR;

1326

759

1327

760

if(ret != GNUTLS_E_SUCCESS){

1328

761

if(debug){

1329

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

762

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

1330

763

gnutls_perror(ret);

1331

764

}

1332

765

errno = EPROTO;

1336

769

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

1337

770

1338

771

if(debug){

1339

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

1340

" %s\n", ip);

772

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

773

ip);

1341

774

}

1342

775

1343

776

while(true){

1348

781

}

1349

782

1350

783

buffer_capacity = incbuffer(&buffer, buffer_length,

1351

buffer_capacity);

784

buffer_capacity);

1352

785

if(buffer_capacity == 0){

1353

786

int e = errno;

1354

perror_plus("incbuffer");

787

perror("incbuffer");

1355

788

errno = e;

1356

789

goto mandos_end;

1357

790

}

1381

814

}

1382

815

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

1383

816

if(ret < 0){

1384

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

1385

"***\n");

817

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

1386

818

gnutls_perror(ret);

1387

819

errno = EPROTO;

1388

820

goto mandos_end;

1389

821

}

1390

822

break;

1391

823

default:

1392

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

1393

" encrypted session with Mandos server\n");

824

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

825

" encrypted session with Mandos server\n");

1394

826

gnutls_bye(session, GNUTLS_SHUT_RDWR);

1395

827

errno = EIO;

1396

828

goto mandos_end;

1401

833

}

1402

834

1403

835

if(debug){

1404

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

836

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

1405

837

}

1406

838

1407

839

if(quit_now){

1419

851

1420

852

if(buffer_length > 0){

1421

853

ssize_t decrypted_buffer_size;

1422

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

1423

&decrypted_buffer, mc);

854

decrypted_buffer_size = pgp_packet_decrypt(buffer,

855

buffer_length,

856

&decrypted_buffer);

1424

857

if(decrypted_buffer_size >= 0){

1425

858

1426

859

written = 0;

1436

869

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

1437

870

int e = errno;

1438

871

if(debug){

1439

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

1440

strerror(errno));

872

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

873

strerror(errno));

1441

874

}

1442

875

errno = e;

1443

876

goto mandos_end;

1452

885

1453

886

mandos_end:

1454

887

{

1455

if(route_added){

1456

if(not delete_local_route(ip, if_index)){

1457

fprintf_plus(stderr, "Failed to delete local route to %s on"

1458

" interface %d", ip, if_index);

1459

}

1460

}

1461

888

int e = errno;

1462

889

free(decrypted_buffer);

1463

890

free(buffer);

1464

891

if(tcp_sd >= 0){

1465

ret = close(tcp_sd);

892

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

1466

893

}

1467

894

if(ret == -1){

1468

895

if(e == 0){

1469

896

e = errno;

1470

897

}

1471

perror_plus("close");

898

perror("close");

1472

899

}

1473

900

gnutls_deinit(session);

1474

errno = e;

1475

901

if(quit_now){

1476

errno = EINTR;

902

e = EINTR;

1477

903

retval = -1;

1478

904

}

905

errno = e;

1479

906

}

1480

907

return retval;

1481

908

}

1482

909

1483

__attribute__((nonnull))

1484

910

static void resolve_callback(AvahiSServiceResolver *r,

1485

911

AvahiIfIndex interface,

1486

912

AvahiProtocol proto,

1494

920

AVAHI_GCC_UNUSED AvahiStringList *txt,

1495

921

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1496

922

flags,

1497

void *mc){

1498

if(r == NULL){

1499

return;

1500

}

923

AVAHI_GCC_UNUSED void* userdata){

924

assert(r);

1501

925

1502

926

/* Called whenever a service has been resolved successfully or

1503

927

timed out */

1504

928

1505

929

if(quit_now){

1506

avahi_s_service_resolver_free(r);

1507

930

return;

1508

931

}

1509

932

1510

933

switch(event){

1511

934

default:

1512

935

case AVAHI_RESOLVER_FAILURE:

1513

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

1514

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

1515

domain,

1516

avahi_strerror(avahi_server_errno

1517

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

936

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

937

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

938

avahi_strerror(avahi_server_errno(mc.server)));

1518

939

break;

1519

940

1520

941

case AVAHI_RESOLVER_FOUND:

1522

943

char ip[AVAHI_ADDRESS_STR_MAX];

1523

944

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

1524

945

if(debug){

1525

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

1526

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

1527

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

946

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

947

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

948

ip, (intmax_t)interface, port);

1528

949

}

1529

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

1530

interface,

1531

avahi_proto_to_af(proto),

1532

mc);

950

int ret = start_mandos_communication(ip, port, interface,

951

avahi_proto_to_af(proto));

1533

952

if(ret == 0){

1534

avahi_simple_poll_quit(simple_poll);

1535

} else {

1536

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

1537

avahi_proto_to_af(proto),

1538

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

1539

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

1540

" list\n", name);

1541

}

953

avahi_simple_poll_quit(mc.simple_poll);

1542

954

}

1543

955

}

1544

956

}

1554

966

const char *domain,

1555

967

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1556

968

flags,

1557

void *mc){

1558

if(b == NULL){

1559

return;

1560

}

969

AVAHI_GCC_UNUSED void* userdata){

970

assert(b);

1561

971

1562

972

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

1563

973

is removed from the LAN */

1570

980

default:

1571

981

case AVAHI_BROWSER_FAILURE:

1572

982

1573

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

1574

avahi_strerror(avahi_server_errno

1575

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

1576

avahi_simple_poll_quit(simple_poll);

983

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

984

avahi_strerror(avahi_server_errno(mc.server)));

985

avahi_simple_poll_quit(mc.simple_poll);

1577

986

return;

1578

987

1579

988

case AVAHI_BROWSER_NEW:

1582

991

the callback function is called the Avahi server will free the

1583

992

resolver for us. */

1584

993

1585

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

1586

interface, protocol, name, type,

1587

domain, protocol, 0,

1588

resolve_callback, mc) == NULL)

1589

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

1590

" %s\n", name,

1591

avahi_strerror(avahi_server_errno

1592

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

994

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

995

name, type, domain, protocol, 0,

996

resolve_callback, NULL) == NULL)

997

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

998

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

1593

999

break;

1594

1000

1595

1001

case AVAHI_BROWSER_REMOVE:

1598

1004

case AVAHI_BROWSER_ALL_FOR_NOW:

1599

1005

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1600

1006

if(debug){

1601

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

1602

" searching...\n");

1007

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

1603

1008

}

1604

1009

break;

1605

1010

}

1606

1011

}

1607

1012

1608

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

1013

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

1609

1014

static void handle_sigterm(int sig){

1610

1015

if(quit_now){

1611

1016

return;

1613

1018

quit_now = 1;

1614

1019

signal_received = sig;

1615

1020

int old_errno = errno;

1616

/* set main loop to exit */

1617

if(simple_poll != NULL){

1618

avahi_simple_poll_quit(simple_poll);

1021

if(mc.simple_poll != NULL){

1022

avahi_simple_poll_quit(mc.simple_poll);

1619

1023

}

1620

1024

errno = old_errno;

1621

1025

}

1622

1026

1623

__attribute__((nonnull, warn_unused_result))

1624

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

1625

int ret;

1626

error_t ret_errno;

1627

1628

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

1629

if(s < 0){

1630

ret_errno = errno;

1631

perror_plus("socket");

1632

errno = ret_errno;

1633

return false;

1634

}

1635

strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);

1636

ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */

1637

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1638

if(ret == -1){

1639

if(debug){

1640

ret_errno = errno;

1641

perror_plus("ioctl SIOCGIFFLAGS");

1642

errno = ret_errno;

1643

}

1644

return false;

1645

}

1646

return true;

1647

}

1648

1649

__attribute__((nonnull, warn_unused_result))

1650

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

1651

1652

/* Reject the loopback device */

1653

if(ifr->ifr_flags & IFF_LOOPBACK){

1654

if(debug){

1655

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

1656

ifname);

1657

}

1658

return false;

1659

}

1660

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

1661

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

1662

if(debug){

1663

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

1664

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

1665

}

1666

return true;

1667

}

1668

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

1669

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

1670

if(debug){

1671

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1672

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

1673

}

1674

return false;

1675

}

1676

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

1677

if(ifr->ifr_flags & IFF_NOARP){

1678

if(debug){

1679

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

1680

ifname);

1681

}

1682

return false;

1683

}

1684

1685

/* Accept this device */

1686

if(debug){

1687

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

1688

}

1689

return true;

1690

}

1691

1692

1027

/*

1693

1028

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

1694

1029

* corresponds to an acceptable network device.

1695

1030

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

1696

1031

*/

1697

__attribute__((nonnull, warn_unused_result))

1698

1032

int good_interface(const struct dirent *if_entry){

1033

ssize_t ssret;

1034

char *flagname = NULL;

1035

int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,

1036

if_entry->d_name);

1037

if(ret < 0){

1038

perror("asprintf");

1039

return 0;

1040

}

1699

1041

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

1700

1042

return 0;

1701

1043

}

1702

1703

struct ifreq ifr;

1704

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

1705

if(debug){

1706

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

1707

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

1708

}

1709

return 0;

1710

}

1711

1712

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

1713

return 0;

1714

}

1715

return 1;

1716

}

1717

1718

/*

1719

* This function determines if a network interface is up.

1720

*/

1721

__attribute__((nonnull, warn_unused_result))

1722

bool interface_is_up(const char *interface){

1723

struct ifreq ifr;

1724

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

1725

if(debug){

1726

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

1727

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

1728

}

1729

return false;

1730

}

1731

1732

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

1733

}

1734

1735

/*

1736

* This function determines if a network interface is running

1737

*/

1738

__attribute__((nonnull, warn_unused_result))

1739

bool interface_is_running(const char *interface){

1740

struct ifreq ifr;

1741

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

1742

if(debug){

1743

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

1744

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

1745

}

1746

return false;

1747

}

1748

1749

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

1750

}

1751

1752

__attribute__((nonnull, pure, warn_unused_result))

1753

int notdotentries(const struct dirent *direntry){

1754

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

1755

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

1756

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

1757

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

1758

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

1759

return 0;

1760

}

1761

return 1;

1762

}

1763

1764

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

1765

__attribute__((nonnull, warn_unused_result))

1766

int runnable_hook(const struct dirent *direntry){

1767

int ret;

1768

size_t sret;

1769

struct stat st;

1770

1771

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

1772

/* Empty name? */

1773

return 0;

1774

}

1775

1776

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

1777

"abcdefghijklmnopqrstuvwxyz"

1778

"0123456789"

1779

"_.-");

1780

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

1781

/* Contains non-allowed characters */

1782

if(debug){

1783

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

1784

direntry->d_name);

1785

}

1786

return 0;

1787

}

1788

1789

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

1790

if(ret == -1){

1791

if(debug){

1792

perror_plus("Could not stat hook");

1793

}

1794

return 0;

1795

}

1796

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

1797

/* Not a regular file */

1798

if(debug){

1799

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

1800

direntry->d_name);

1801

}

1802

return 0;

1803

}

1804

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

1805

/* Not executable */

1806

if(debug){

1807

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

1808

direntry->d_name);

1809

}

1810

return 0;

1811

}

1044

int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));

1045

if(flags_fd == -1){

1046

perror("open");

1047

return 0;

1048

}

1049

typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */

1050

/* read line from flags_fd */

1051

ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */

1052

char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */

1053

flagstring[(size_t)to_read] = '\0';

1054

if(flagstring == NULL){

1055

perror("malloc");

1056

close(flags_fd);

1057

return 0;

1058

}

1059

while(to_read > 0){

1060

ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,

1061

(size_t)to_read));

1062

if(ssret == -1){

1063

perror("read");

1064

free(flagstring);

1065

close(flags_fd);

1066

return 0;

1067

}

1068

to_read -= ssret;

1069

if(ssret == 0){

1070

break;

1071

}

1072

}

1073

close(flags_fd);

1074

intmax_t tmpmax;

1075

char *tmp;

1076

errno = 0;

1077

tmpmax = strtoimax(flagstring, &tmp, 0);

1078

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

1079

and not (isspace(*tmp)))

1080

or tmpmax != (ifreq_flags)tmpmax){

1081

if(debug){

1082

fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",

1083

flagstring, if_entry->d_name);

1084

}

1085

free(flagstring);

1086

return 0;

1087

}

1088

free(flagstring);

1089

ifreq_flags flags = (ifreq_flags)tmpmax;

1090

/* Reject the loopback device */

1091

if(flags & IFF_LOOPBACK){

1092

if(debug){

1093

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

1094

if_entry->d_name);

1095

}

1096

return 0;

1097

}

1098

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

1099

if(connect_to != NULL and (flags & IFF_POINTOPOINT)){

1100

if(debug){

1101

fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",

1102

if_entry->d_name);

1103

}

1104

return 1;

1105

}

1106

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

1107

if(not (flags & IFF_BROADCAST)){

1108

if(debug){

1109

fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",

1110

if_entry->d_name);

1111

}

1112

return 0;

1113

}

1114

/* Accept this device */

1812

1115

if(debug){

1813

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

1814

direntry->d_name);

1116

fprintf(stderr, "Interface \"%s\" is acceptable\n",

1117

if_entry->d_name);

1815

1118

}

1816

1119

return 1;

1817

1120

}

1818

1121

1819

__attribute__((nonnull, warn_unused_result))

1820

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1821

mandos_context *mc){

1822

int ret;

1823

struct timespec now;

1824

struct timespec waited_time;

1825

intmax_t block_time;

1826

1827

while(true){

1828

if(mc->current_server == NULL){

1829

if(debug){

1830

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

1831

" No timeout!\n");

1832

}

1833

ret = avahi_simple_poll_iterate(s, -1);

1834

} else {

1835

if(debug){

1836

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

1837

" it, or wait\n");

1838

}

1839

/* the current time */

1840

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1841

if(ret == -1){

1842

perror_plus("clock_gettime");

1843

return -1;

1844

}

1845

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

1846

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

1847

waited_time.tv_sec = (now.tv_sec

1848

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

1849

waited_time.tv_nsec = (now.tv_nsec

1850

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

1851

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

1852

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

1853

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

1854

block_time = ((retry_interval

1855

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

1856

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

1857

1858

if(debug){

1859

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

1860

block_time);

1861

}

1862

1863

if(block_time <= 0){

1864

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

1865

mc->current_server->port,

1866

mc->current_server->if_index,

1867

mc->current_server->af, mc);

1868

if(ret == 0){

1869

avahi_simple_poll_quit(s);

1870

return 0;

1871

}

1872

ret = clock_gettime(CLOCK_MONOTONIC,

1873

&mc->current_server->last_seen);

1874

if(ret == -1){

1875

perror_plus("clock_gettime");

1876

return -1;

1877

}

1878

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

1879

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

1880

servers, but don't block */

1881

}

1882

1883

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

1884

}

1885

if(ret != 0){

1886

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

1887

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

1888

}

1889

}

1890

}

1891

}

1892

1893

__attribute__((nonnull))

1894

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

1895

const float delay){

1896

struct dirent **direntries = NULL;

1897

if(hookdir_fd == -1){

1898

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1899

| O_CLOEXEC);

1900

if(hookdir_fd == -1){

1901

if(errno == ENOENT){

1902

if(debug){

1903

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

1904

" found\n", hookdir);

1905

}

1906

} else {

1907

perror_plus("open");

1908

}

1909

return;

1910

}

1911

}

1912

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

1913

runnable_hook, alphasort);

1914

if(numhooks == -1){

1915

perror_plus("scandir");

1916

return;

1917

}

1918

struct dirent *direntry;

1919

int ret;

1920

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

1921

if(devnull == -1){

1922

perror_plus("open(\"/dev/null\", O_RDONLY)");

1923

return;

1924

}

1925

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

1926

direntry = direntries[i];

1927

if(debug){

1928

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

1929

direntry->d_name);

1930

}

1931

pid_t hook_pid = fork();

1932

if(hook_pid == 0){

1933

/* Child */

1934

/* Raise privileges */

1935

errno = raise_privileges_permanently();

1936

if(errno != 0){

1937

perror_plus("Failed to raise privileges");

1938

_exit(EX_NOPERM);

1939

}

1940

/* Set group */

1941

errno = 0;

1942

ret = setgid(0);

1943

if(ret == -1){

1944

perror_plus("setgid");

1945

_exit(EX_NOPERM);

1946

}

1947

/* Reset supplementary groups */

1948

errno = 0;

1949

ret = setgroups(0, NULL);

1950

if(ret == -1){

1951

perror_plus("setgroups");

1952

_exit(EX_NOPERM);

1953

}

1954

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

1955

if(ret == -1){

1956

perror_plus("setenv");

1957

_exit(EX_OSERR);

1958

}

1959

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

1960

if(ret == -1){

1961

perror_plus("setenv");

1962

_exit(EX_OSERR);

1963

}

1964

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

1965

if(ret == -1){

1966

perror_plus("setenv");

1967

_exit(EX_OSERR);

1968

}

1969

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

1970

if(ret == -1){

1971

perror_plus("setenv");

1972

_exit(EX_OSERR);

1973

}

1974

char *delaystring;

1975

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

1976

if(ret == -1){

1977

perror_plus("asprintf");

1978

_exit(EX_OSERR);

1979

}

1980

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

1981

if(ret == -1){

1982

free(delaystring);

1983

perror_plus("setenv");

1984

_exit(EX_OSERR);

1985

}

1986

free(delaystring);

1987

if(connect_to != NULL){

1988

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

1989

if(ret == -1){

1990

perror_plus("setenv");

1991

_exit(EX_OSERR);

1992

}

1993

}

1994

int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,

1995

direntry->d_name,

1996

O_RDONLY));

1997

if(hook_fd == -1){

1998

perror_plus("openat");

1999

_exit(EXIT_FAILURE);

2000

}

2001

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

2002

perror_plus("close");

2003

_exit(EXIT_FAILURE);

2004

}

2005

ret = dup2(devnull, STDIN_FILENO);

2006

if(ret == -1){

2007

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

2008

_exit(EX_OSERR);

2009

}

2010

ret = close(devnull);

2011

if(ret == -1){

2012

perror_plus("close");

2013

_exit(EX_OSERR);

2014

}

2015

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2016

if(ret == -1){

2017

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

2018

_exit(EX_OSERR);

2019

}

2020

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

2021

environ) == -1){

2022

perror_plus("fexecve");

2023

_exit(EXIT_FAILURE);

2024

}

2025

} else {

2026

if(hook_pid == -1){

2027

perror_plus("fork");

2028

free(direntry);

2029

continue;

2030

}

2031

int status;

2032

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

2033

perror_plus("waitpid");

2034

free(direntry);

2035

continue;

2036

}

2037

if(WIFEXITED(status)){

2038

if(WEXITSTATUS(status) != 0){

2039

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

2040

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

2041

WEXITSTATUS(status));

2042

free(direntry);

2043

continue;

2044

}

2045

} else if(WIFSIGNALED(status)){

2046

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

2047

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

2048

WTERMSIG(status));

2049

free(direntry);

2050

continue;

2051

} else {

2052

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

2053

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

2054

free(direntry);

2055

continue;

2056

}

2057

}

2058

if(debug){

2059

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

2060

direntry->d_name);

2061

}

2062

free(direntry);

2063

}

2064

free(direntries);

2065

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

2066

perror_plus("close");

2067

} else {

2068

hookdir_fd = -1;

2069

}

2070

close(devnull);

2071

}

2072

2073

__attribute__((nonnull, warn_unused_result))

2074

error_t bring_up_interface(const char *const interface,

2075

const float delay){

2076

error_t old_errno = errno;

2077

int ret;

2078

struct ifreq network;

2079

unsigned int if_index = if_nametoindex(interface);

2080

if(if_index == 0){

2081

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

2082

errno = old_errno;

2083

return ENXIO;

2084

}

2085

2086

if(quit_now){

2087

errno = old_errno;

2088

return EINTR;

2089

}

2090

2091

if(not interface_is_up(interface)){

2092

error_t ret_errno = 0, ioctl_errno = 0;

2093

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

2094

ret_errno = errno;

2095

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

2096

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

2097

errno = old_errno;

2098

return ret_errno;

2099

}

2100

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

2101

2102

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

2103

if(sd == -1){

2104

ret_errno = errno;

2105

perror_plus("socket");

2106

errno = old_errno;

2107

return ret_errno;

2108

}

2109

2110

if(quit_now){

2111

ret = close(sd);

2112

if(ret == -1){

2113

perror_plus("close");

2114

}

2115

errno = old_errno;

2116

return EINTR;

2117

}

2118

2119

if(debug){

2120

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

2121

interface);

2122

}

2123

2124

/* Raise privileges */

2125

ret_errno = raise_privileges();

2126

if(ret_errno != 0){

2127

errno = ret_errno;

2128

perror_plus("Failed to raise privileges");

2129

}

2130

2131

#ifdef __linux__

2132

int ret_linux;

2133

bool restore_loglevel = false;

2134

if(ret_errno == 0){

2135

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2136

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

2137

ret_linux = klogctl(8, NULL, 5);

2138

if(ret_linux == -1){

2139

perror_plus("klogctl");

2140

} else {

2141

restore_loglevel = true;

2142

}

2143

}

2144

#endif /* __linux__ */

2145

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

2146

ioctl_errno = errno;

2147

#ifdef __linux__

2148

if(restore_loglevel){

2149

ret_linux = klogctl(7, NULL, 0);

2150

if(ret_linux == -1){

2151

perror_plus("klogctl");

2152

}

2153

}

2154

#endif /* __linux__ */

2155

2156

/* If raise_privileges() succeeded above */

2157

if(ret_errno == 0){

2158

/* Lower privileges */

2159

ret_errno = lower_privileges();

2160

if(ret_errno != 0){

2161

errno = ret_errno;

2162

perror_plus("Failed to lower privileges");

2163

}

2164

}

2165

2166

/* Close the socket */

2167

ret = close(sd);

2168

if(ret == -1){

2169

perror_plus("close");

2170

}

2171

2172

if(ret_setflags == -1){

2173

errno = ioctl_errno;

2174

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2175

errno = old_errno;

2176

return ioctl_errno;

2177

}

2178

} else if(debug){

2179

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

2180

interface);

2181

}

2182

2183

/* Sleep checking until interface is running.

2184

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

2185

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

2186

if(interface_is_running(interface)){

2187

break;

2188

}

2189

struct timespec sleeptime = { .tv_nsec = 250000000 };

2190

ret = nanosleep(&sleeptime, NULL);

2191

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

2192

perror_plus("nanosleep");

2193

}

2194

}

2195

2196

errno = old_errno;

2197

return 0;

2198

}

2199

2200

__attribute__((nonnull, warn_unused_result))

2201

error_t take_down_interface(const char *const interface){

2202

error_t old_errno = errno;

2203

struct ifreq network;

2204

unsigned int if_index = if_nametoindex(interface);

2205

if(if_index == 0){

2206

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

2207

errno = old_errno;

2208

return ENXIO;

2209

}

2210

if(interface_is_up(interface)){

2211

error_t ret_errno = 0, ioctl_errno = 0;

2212

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

2213

ret_errno = errno;

2214

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

2215

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

2216

errno = old_errno;

2217

return ret_errno;

2218

}

2219

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

2220

2221

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

2222

if(sd == -1){

2223

ret_errno = errno;

2224

perror_plus("socket");

2225

errno = old_errno;

2226

return ret_errno;

2227

}

2228

2229

if(debug){

2230

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

2231

interface);

2232

}

2233

2234

/* Raise privileges */

2235

ret_errno = raise_privileges();

2236

if(ret_errno != 0){

2237

errno = ret_errno;

2238

perror_plus("Failed to raise privileges");

2239

}

2240

2241

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

2242

ioctl_errno = errno;

2243

2244

/* If raise_privileges() succeeded above */

2245

if(ret_errno == 0){

2246

/* Lower privileges */

2247

ret_errno = lower_privileges();

2248

if(ret_errno != 0){

2249

errno = ret_errno;

2250

perror_plus("Failed to lower privileges");

2251

}

2252

}

2253

2254

/* Close the socket */

2255

int ret = close(sd);

2256

if(ret == -1){

2257

perror_plus("close");

2258

}

2259

2260

if(ret_setflags == -1){

2261

errno = ioctl_errno;

2262

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2263

errno = old_errno;

2264

return ioctl_errno;

2265

}

2266

} else if(debug){

2267

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

2268

interface);

2269

}

2270

2271

errno = old_errno;

2272

return 0;

2273

}

2274

2275

1122

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

2276

mandos_context mc = { .server = NULL, .dh_bits = 0,

2277

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

2278

":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",

2279

.current_server = NULL, .interfaces = NULL,

2280

.interfaces_size = 0 };

2281

1123

AvahiSServiceBrowser *sb = NULL;

2282

error_t ret_errno;

1124

int error;

2283

1125

int ret;

2284

1126

intmax_t tmpmax;

2285

1127

char *tmp;

2286

1128

int exitcode = EXIT_SUCCESS;

2287

char *interfaces_to_take_down = NULL;

2288

size_t interfaces_to_take_down_size = 0;

2289

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

2290

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

2291

char *tempdir = NULL;

1129

const char *interface = "";

1130

struct ifreq network;

1131

int sd = -1;

1132

bool take_down_interface = false;

1133

uid_t uid;

1134

gid_t gid;

1135

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

1136

bool tempdir_created = false;

2292

1137

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2293

1138

const char *seckey = PATHDIR "/" SECKEY;

2294

1139

const char *pubkey = PATHDIR "/" PUBKEY;

2295

const char *dh_params_file = NULL;

2296

char *interfaces_hooks = NULL;

2297

1140

2298

1141

bool gnutls_initialized = false;

2299

1142

bool gpgme_initialized = false;

2300

1143

float delay = 2.5f;

2301

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

2302

retrying the same server again */

2303

1144

2304

1145

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

2305

1146

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

2311

1152

errno = 0;

2312

1153

ret = setgid(gid);

2313

1154

if(ret == -1){

2314

perror_plus("setgid");

1155

perror("setgid");

2315

1156

}

2316

1157

2317

1158

/* Lower user privileges (temporarily) */

2318

1159

errno = 0;

2319

1160

ret = seteuid(uid);

2320

1161

if(ret == -1){

2321

perror_plus("seteuid");

1162

perror("seteuid");

2322

1163

}

2323

1164

2324

1165

if(quit_now){

2351

1192

.doc = "Bit length of the prime number used in the"

2352

1193

" Diffie-Hellman key exchange",

2353

1194

.group = 2 },

2354

{ .name = "dh-params", .key = 134,

2355

.arg = "FILE",

2356

.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"

2357

" for the Diffie-Hellman key exchange",

2358

.group = 2 },

2359

1195

{ .name = "priority", .key = 130,

2360

1196

.arg = "STRING",

2361

1197

.doc = "GnuTLS priority string for the TLS handshake",

2364

1200

.arg = "SECONDS",

2365

1201

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

2366

1202

.group = 2 },

2367

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

2368

.arg = "SECONDS",

2369

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

2370

.group = 2 },

2371

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

2372

.arg = "DIR",

2373

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

2374

.group = 2 },

2375

1203

/*

2376

1204

* These reproduce what we would get without ARGP_NO_HELP

2377

1205

*/

2395

1223

connect_to = arg;

2396

1224

break;

2397

1225

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

2398

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

2399

arg, (int)',');

2400

if(ret_errno != 0){

2401

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

2402

}

1226

interface = arg;

2403

1227

break;

2404

1228

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

2405

1229

seckey = arg;

2416

1240

}

2417

1241

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

2418

1242

break;

2419

case 134: /* --dh-params */

2420

dh_params_file = arg;

2421

break;

2422

1243

case 130: /* --priority */

2423

1244

mc.priority = arg;

2424

1245

break;

2428

1249

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

2429

1250

argp_error(state, "Bad delay");

2430

1251

}

2431

case 132: /* --retry */

2432

errno = 0;

2433

retry_interval = strtod(arg, &tmp);

2434

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

2435

or (retry_interval * 1000) > INT_MAX

2436

or retry_interval < 0){

2437

argp_error(state, "Bad retry interval");

2438

}

2439

break;

2440

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

2441

hookdir = arg;

2442

1252

break;

2443

1253

/*

2444

1254

* These reproduce what we would get without ARGP_NO_HELP

2451

1261

argp_state_help(state, state->out_stream,

2452

1262

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

2453

1263

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

2454

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

1264

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

2455

1265

exit(argp_err_exit_status);

2456

1266

break;

2457

1267

default:

2472

1282

case ENOMEM:

2473

1283

default:

2474

1284

errno = ret;

2475

perror_plus("argp_parse");

1285

perror("argp_parse");

2476

1286

exitcode = EX_OSERR;

2477

1287

goto end;

2478

1288

case EINVAL:

2481

1291

}

2482

1292

}

2483

1293

2484

{

2485

/* Work around Debian bug #633582:

2486

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

2487

2488

/* Re-raise privileges */

2489

ret_errno = raise_privileges();

2490

if(ret_errno != 0){

2491

errno = ret_errno;

2492

perror_plus("Failed to raise privileges");

2493

} else {

2494

struct stat st;

2495

2496

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

2497

int seckey_fd = open(seckey, O_RDONLY);

2498

if(seckey_fd == -1){

2499

perror_plus("open");

2500

} else {

2501

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

2502

if(ret == -1){

2503

perror_plus("fstat");

2504

} else {

2505

if(S_ISREG(st.st_mode)

2506

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

2507

ret = fchown(seckey_fd, uid, gid);

2508

if(ret == -1){

2509

perror_plus("fchown");

2510

}

2511

}

2512

}

2513

close(seckey_fd);

2514

}

2515

}

2516

2517

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

2518

int pubkey_fd = open(pubkey, O_RDONLY);

2519

if(pubkey_fd == -1){

2520

perror_plus("open");

2521

} else {

2522

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

2523

if(ret == -1){

2524

perror_plus("fstat");

2525

} else {

2526

if(S_ISREG(st.st_mode)

2527

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

2528

ret = fchown(pubkey_fd, uid, gid);

2529

if(ret == -1){

2530

perror_plus("fchown");

2531

}

2532

}

2533

}

2534

close(pubkey_fd);

2535

}

2536

}

2537

2538

if(dh_params_file != NULL

2539

and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){

2540

int dhparams_fd = open(dh_params_file, O_RDONLY);

2541

if(dhparams_fd == -1){

2542

perror_plus("open");

2543

} else {

2544

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

2545

if(ret == -1){

2546

perror_plus("fstat");

2547

} else {

2548

if(S_ISREG(st.st_mode)

2549

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

2550

ret = fchown(dhparams_fd, uid, gid);

2551

if(ret == -1){

2552

perror_plus("fchown");

2553

}

2554

}

2555

}

2556

close(dhparams_fd);

2557

}

2558

}

2559

2560

/* Lower privileges */

2561

ret_errno = lower_privileges();

2562

if(ret_errno != 0){

2563

errno = ret_errno;

2564

perror_plus("Failed to lower privileges");

2565

}

2566

}

2567

}

2568

2569

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

2570

{

2571

char *interface = NULL;

2572

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

2573

interface))){

2574

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

2575

and if_nametoindex(interface) == 0){

2576

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

2577

fprintf_plus(stderr, "Not using nonexisting interface"

2578

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

2579

}

2580

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

2581

interface = NULL;

2582

}

2583

}

2584

}

2585

2586

/* Run network hooks */

2587

{

2588

if(mc.interfaces != NULL){

2589

interfaces_hooks = malloc(mc.interfaces_size);

2590

if(interfaces_hooks == NULL){

2591

perror_plus("malloc");

2592

goto end;

2593

}

2594

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

2595

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

2596

}

2597

run_network_hooks("start", interfaces_hooks != NULL ?

2598

interfaces_hooks : "", delay);

2599

}

2600

2601

1294

if(not debug){

2602

1295

avahi_set_log_function(empty_log);

2603

1296

}

1297

1298

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

1299

struct dirent **direntries;

1300

ret = scandir(sys_class_net, &direntries, good_interface,

1301

alphasort);

1302

if(ret >= 1){

1303

/* Pick the first good interface */

1304

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

1305

if(debug){

1306

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

1307

}

1308

if(interface == NULL){

1309

perror("malloc");

1310

free(direntries);

1311

exitcode = EXIT_FAILURE;

1312

goto end;

1313

}

1314

free(direntries);

1315

} else {

1316

free(direntries);

1317

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

1318

exitcode = EXIT_FAILURE;

1319

goto end;

1320

}

1321

}

2604

1322

2605

1323

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

2606

1324

from the signal handler */

2607

1325

/* Initialize the pseudo-RNG for Avahi */

2608

1326

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

2609

simple_poll = avahi_simple_poll_new();

2610

if(simple_poll == NULL){

2611

fprintf_plus(stderr,

2612

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

1327

mc.simple_poll = avahi_simple_poll_new();

1328

if(mc.simple_poll == NULL){

1329

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

2613

1330

exitcode = EX_UNAVAILABLE;

2614

1331

goto end;

2615

1332

}

2617

1334

sigemptyset(&sigterm_action.sa_mask);

2618

1335

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

2619

1336

if(ret == -1){

2620

perror_plus("sigaddset");

1337

perror("sigaddset");

2621

1338

exitcode = EX_OSERR;

2622

1339

goto end;

2623

1340

}

2624

1341

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

2625

1342

if(ret == -1){

2626

perror_plus("sigaddset");

1343

perror("sigaddset");

2627

1344

exitcode = EX_OSERR;

2628

1345

goto end;

2629

1346

}

2630

1347

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

2631

1348

if(ret == -1){

2632

perror_plus("sigaddset");

1349

perror("sigaddset");

2633

1350

exitcode = EX_OSERR;

2634

1351

goto end;

2635

1352

}

2639

1356

*/

2640

1357

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

2641

1358

if(ret == -1){

2642

perror_plus("sigaction");

1359

perror("sigaction");

2643

1360

return EX_OSERR;

2644

1361

}

2645

1362

if(old_sigterm_action.sa_handler != SIG_IGN){

2646

1363

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

2647

1364

if(ret == -1){

2648

perror_plus("sigaction");

1365

perror("sigaction");

2649

1366

exitcode = EX_OSERR;

2650

1367

goto end;

2651

1368

}

2652

1369

}

2653

1370

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

2654

1371

if(ret == -1){

2655

perror_plus("sigaction");

1372

perror("sigaction");

2656

1373

return EX_OSERR;

2657

1374

}

2658

1375

if(old_sigterm_action.sa_handler != SIG_IGN){

2659

1376

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

2660

1377

if(ret == -1){

2661

perror_plus("sigaction");

1378

perror("sigaction");

2662

1379

exitcode = EX_OSERR;

2663

1380

goto end;

2664

1381

}

2665

1382

}

2666

1383

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

2667

1384

if(ret == -1){

2668

perror_plus("sigaction");

1385

perror("sigaction");

2669

1386

return EX_OSERR;

2670

1387

}

2671

1388

if(old_sigterm_action.sa_handler != SIG_IGN){

2672

1389

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

2673

1390

if(ret == -1){

2674

perror_plus("sigaction");

1391

perror("sigaction");

2675

1392

exitcode = EX_OSERR;

2676

1393

goto end;

2677

1394

}

2678

1395

}

2679

1396

2680

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

2681

if(mc.interfaces == NULL){

2682

struct dirent **direntries = NULL;

2683

/* Look for any good interfaces */

2684

ret = scandir(sys_class_net, &direntries, good_interface,

2685

alphasort);

2686

if(ret >= 1){

2687

/* Add all found interfaces to interfaces list */

2688

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

2689

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

2690

direntries[i]->d_name);

2691

if(ret_errno != 0){

2692

errno = ret_errno;

2693

perror_plus("argz_add");

2694

free(direntries[i]);

2695

continue;

2696

}

2697

if(debug){

2698

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

2699

direntries[i]->d_name);

2700

}

2701

free(direntries[i]);

2702

}

2703

free(direntries);

1397

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

1398

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

1399

if_index = (AvahiIfIndex) if_nametoindex(interface);

1400

if(if_index == 0){

1401

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

1402

exitcode = EX_UNAVAILABLE;

1403

goto end;

1404

}

1405

1406

if(quit_now){

1407

goto end;

1408

}

1409

1410

/* Re-raise priviliges */

1411

errno = 0;

1412

ret = seteuid(0);

1413

if(ret == -1){

1414

perror("seteuid");

1415

}

1416

1417

#ifdef __linux__

1418

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1419

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

1420

ret = klogctl(8, NULL, 5);

1421

bool restore_loglevel = true;

1422

if(ret == -1){

1423

restore_loglevel = false;

1424

perror("klogctl");

1425

}

1426

#endif /* __linux__ */

1427

1428

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1429

if(sd < 0){

1430

perror("socket");

1431

exitcode = EX_OSERR;

1432

#ifdef __linux__

1433

if(restore_loglevel){

1434

ret = klogctl(7, NULL, 0);

1435

if(ret == -1){

1436

perror("klogctl");

1437

}

1438

}

1439

#endif /* __linux__ */

1440

/* Lower privileges */

1441

errno = 0;

1442

ret = seteuid(uid);

1443

if(ret == -1){

1444

perror("seteuid");

1445

}

1446

goto end;

1447

}

1448

strcpy(network.ifr_name, interface);

1449

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

1450

if(ret == -1){

1451

perror("ioctl SIOCGIFFLAGS");

1452

#ifdef __linux__

1453

if(restore_loglevel){

1454

ret = klogctl(7, NULL, 0);

1455

if(ret == -1){

1456

perror("klogctl");

1457

}

1458

}

1459

#endif /* __linux__ */

1460

exitcode = EX_OSERR;

1461

/* Lower privileges */

1462

errno = 0;

1463

ret = seteuid(uid);

1464

if(ret == -1){

1465

perror("seteuid");

1466

}

1467

goto end;

1468

}

1469

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

1470

network.ifr_flags |= IFF_UP;

1471

take_down_interface = true;

1472

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

1473

if(ret == -1){

1474

take_down_interface = false;

1475

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1476

exitcode = EX_OSERR;

1477

#ifdef __linux__

1478

if(restore_loglevel){

1479

ret = klogctl(7, NULL, 0);

1480

if(ret == -1){

1481

perror("klogctl");

1482

}

1483

}

1484

#endif /* __linux__ */

1485

/* Lower privileges */

1486

errno = 0;

1487

ret = seteuid(uid);

1488

if(ret == -1){

1489

perror("seteuid");

1490

}

1491

goto end;

1492

}

1493

}

1494

/* sleep checking until interface is running */

1495

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

1496

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

1497

if(ret == -1){

1498

perror("ioctl SIOCGIFFLAGS");

1499

} else if(network.ifr_flags & IFF_RUNNING){

1500

break;

1501

}

1502

struct timespec sleeptime = { .tv_nsec = 250000000 };

1503

ret = nanosleep(&sleeptime, NULL);

1504

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

1505

perror("nanosleep");

1506

}

1507

}

1508

if(not take_down_interface){

1509

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

1510

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

1511

if(ret == -1){

1512

perror("close");

1513

}

1514

}

1515

#ifdef __linux__

1516

if(restore_loglevel){

1517

/* Restores kernel loglevel to default */

1518

ret = klogctl(7, NULL, 0);

1519

if(ret == -1){

1520

perror("klogctl");

1521

}

1522

}

1523

#endif /* __linux__ */

1524

/* Lower privileges */

1525

errno = 0;

1526

if(take_down_interface){

1527

/* Lower privileges */

1528

ret = seteuid(uid);

1529

if(ret == -1){

1530

perror("seteuid");

1531

}

2704

1532

} else {

2705

if(ret == 0){

2706

free(direntries);

2707

}

2708

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

2709

exitcode = EXIT_FAILURE;

2710

goto end;

2711

}

2712

}

2713

2714

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

2715

{

2716

char *interface = NULL;

2717

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

2718

interface))){

2719

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

2720

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

2721

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

2722

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

2723

interface);

2724

interface = NULL;

2725

while((interface = argz_next(mc.interfaces,

2726

mc.interfaces_size, interface))){

2727

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

2728

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

2729

interface);

2730

interface = NULL;

2731

}

2732

}

2733

break;

2734

}

2735

bool interface_was_up = interface_is_up(interface);

2736

errno = bring_up_interface(interface, delay);

2737

if(not interface_was_up){

2738

if(errno != 0){

2739

fprintf_plus(stderr, "Failed to bring up interface \"%s\":"

2740

" %s\n", interface, strerror(errno));

2741

} else {

2742

errno = argz_add(&interfaces_to_take_down,

2743

&interfaces_to_take_down_size,

2744

interface);

2745

if(errno != 0){

2746

perror_plus("argz_add");

2747

}

2748

}

2749

}

2750

}

2751

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

2752

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

2753

}

2754

}

2755

2756

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

2757

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

2758

if(debug){

2759

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

2760

mc.interfaces);

2761

}

2762

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

1533

/* Lower privileges permanently */

1534

ret = setuid(uid);

1535

if(ret == -1){

1536

perror("setuid");

1537

}

1538

}

2763

1539

}

2764

1540

2765

1541

if(quit_now){

2766

1542

goto end;

2767

1543

}

2768

1544

2769

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

1545

ret = init_gnutls_global(pubkey, seckey);

2770

1546

if(ret == -1){

2771

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

1547

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

2772

1548

exitcode = EX_UNAVAILABLE;

2773

1549

goto end;

2774

1550

} else {

2779

1555

goto end;

2780

1556

}

2781

1557

2782

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

2783

tempdir = mkdtemp(run_tempdir);

2784

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

2785

if(debug){

2786

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

2787

run_tempdir, old_tempdir);

2788

}

2789

tempdir = mkdtemp(old_tempdir);

2790

}

2791

if(tempdir == NULL){

2792

perror_plus("mkdtemp");

1558

tempdir_created = true;

1559

if(mkdtemp(tempdir) == NULL){

1560

tempdir_created = false;

1561

perror("mkdtemp");

2793

1562

goto end;

2794

1563

}

2795

1564

2797

1566

goto end;

2798

1567

}

2799

1568

2800

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

2801

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

1569

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

1570

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

2802

1571

exitcode = EX_UNAVAILABLE;

2803

1572

goto end;

2804

1573

} else {

2813

1582

/* Connect directly, do not use Zeroconf */

2814

1583

/* (Mainly meant for debugging) */

2815

1584

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

2816

2817

1585

if(address == NULL){

2818

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

1586

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

2819

1587

exitcode = EX_USAGE;

2820

1588

goto end;

2821

1589

}

2824

1592

goto end;

2825

1593

}

2826

1594

2827

in_port_t port;

1595

uint16_t port;

2828

1596

errno = 0;

2829

1597

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

2830

1598

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

2831

or tmpmax != (in_port_t)tmpmax){

2832

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

1599

or tmpmax != (uint16_t)tmpmax){

1600

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

2833

1601

exitcode = EX_USAGE;

2834

1602

goto end;

2835

1603

}

2836

1604

2837

1605

if(quit_now){

2838

1606

goto end;

2839

1607

}

2840

1608

2841

port = (in_port_t)tmpmax;

1609

port = (uint16_t)tmpmax;

2842

1610

*address = '\0';

1611

address = connect_to;

2843

1612

/* Colon in address indicates IPv6 */

2844

1613

int af;

2845

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

1614

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

2846

1615

af = AF_INET6;

2847

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

2848

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

2849

{

2850

connect_to++;

2851

address[-1] = '\0';

2852

}

2853

1616

} else {

2854

1617

af = AF_INET;

2855

1618

}

2856

address = connect_to;

2857

1619

2858

1620

if(quit_now){

2859

1621

goto end;

2860

1622

}

2861

1623

2862

1624

while(not quit_now){

2863

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

2864

&mc);

1625

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

2865

1626

if(quit_now or ret == 0){

2866

1627

break;

2867

1628

}

2868

if(debug){

2869

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

2870

(int)retry_interval);

2871

}

2872

sleep((unsigned int)retry_interval);

2873

}

2874

2875

if(not quit_now){

1629

sleep(15);

1630

};

1631

1632

if (not quit_now){

2876

1633

exitcode = EXIT_SUCCESS;

2877

1634

}

2878

1635

2879

1636

goto end;

2880

1637

}

2881

1638

2893

1650

config.publish_domain = 0;

2894

1651

2895

1652

/* Allocate a new server */

2896

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2897

&config, NULL, NULL, &ret_errno);

1653

mc.server = avahi_server_new(avahi_simple_poll_get

1654

(mc.simple_poll), &config, NULL,

1655

NULL, &error);

2898

1656

2899

1657

/* Free the Avahi configuration data */

2900

1658

avahi_server_config_free(&config);

2902

1660

2903

1661

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

2904

1662

if(mc.server == NULL){

2905

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

2906

avahi_strerror(ret_errno));

1663

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

1664

avahi_strerror(error));

2907

1665

exitcode = EX_UNAVAILABLE;

2908

1666

goto end;

2909

1667

}

2915

1673

/* Create the Avahi service browser */

2916

1674

sb = avahi_s_service_browser_new(mc.server, if_index,

2917

1675

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2918

NULL, 0, browse_callback,

2919

(void *)&mc);

1676

NULL, 0, browse_callback, NULL);

2920

1677

if(sb == NULL){

2921

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

2922

avahi_strerror(avahi_server_errno(mc.server)));

1678

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

1679

avahi_strerror(avahi_server_errno(mc.server)));

2923

1680

exitcode = EX_UNAVAILABLE;

2924

1681

goto end;

2925

1682

}

2931

1688

/* Run the main loop */

2932

1689

2933

1690

if(debug){

2934

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

1691

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

2935

1692

}

2936

1693

2937

ret = avahi_loop_with_timeout(simple_poll,

2938

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

2939

if(debug){

2940

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

2941

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

2942

}

1694

avahi_simple_poll_loop(mc.simple_poll);

2943

1695

2944

1696

end:

2945

1697

2946

1698

if(debug){

2947

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

1699

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

2948

1700

}

2949

1701

2950

1702

/* Cleanup things */

2951

free(mc.interfaces);

2952

2953

1703

if(sb != NULL)

2954

1704

avahi_s_service_browser_free(sb);

2955

1705

2956

1706

if(mc.server != NULL)

2957

1707

avahi_server_free(mc.server);

2958

1708

2959

if(simple_poll != NULL)

2960

avahi_simple_poll_free(simple_poll);

1709

if(mc.simple_poll != NULL)

1710

avahi_simple_poll_free(mc.simple_poll);

2961

1711

2962

1712

if(gnutls_initialized){

2963

1713

gnutls_certificate_free_credentials(mc.cred);

1714

gnutls_global_deinit();

2964

1715

gnutls_dh_params_deinit(mc.dh_params);

2965

1716

}

2966

1717

2968

1719

gpgme_release(mc.ctx);

2969

1720

}

2970

1721

2971

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

2972

has seen */

2973

if(mc.current_server != NULL){

2974

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

2975

while(mc.current_server != NULL){

2976

server *next = mc.current_server->next;

2977

#ifdef __GNUC__

2978

#pragma GCC diagnostic push

2979

#pragma GCC diagnostic ignored "-Wcast-qual"

2980

#endif

2981

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

2982

#ifdef __GNUC__

2983

#pragma GCC diagnostic pop

2984

#endif

2985

free(mc.current_server);

2986

mc.current_server = next;

2987

}

2988

}

2989

2990

/* Re-raise privileges */

2991

{

2992

ret_errno = raise_privileges();

2993

if(ret_errno != 0){

2994

errno = ret_errno;

2995

perror_plus("Failed to raise privileges");

2996

} else {

2997

2998

/* Run network hooks */

2999

run_network_hooks("stop", interfaces_hooks != NULL ?

3000

interfaces_hooks : "", delay);

3001

3002

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

3003

{

3004

char *interface = NULL;

3005

while((interface=argz_next(interfaces_to_take_down,

3006

interfaces_to_take_down_size,

3007

interface))){

3008

ret_errno = take_down_interface(interface);

3009

if(ret_errno != 0){

3010

errno = ret_errno;

3011

perror_plus("Failed to take down interface");

3012

}

3013

}

3014

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

3015

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

3016

" down\n");

3017

}

3018

}

3019

}

3020

3021

ret_errno = lower_privileges_permanently();

3022

if(ret_errno != 0){

3023

errno = ret_errno;

3024

perror_plus("Failed to lower privileges permanently");

3025

}

3026

}

3027

3028

free(interfaces_to_take_down);

3029

free(interfaces_hooks);

3030

3031

void clean_dir_at(int base, const char * const dirname,

3032

uintmax_t level){

3033

struct dirent **direntries = NULL;

3034

int dret;

3035

int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,

3036

O_RDONLY

3037

| O_NOFOLLOW

3038

| O_DIRECTORY

3039

| O_PATH));

3040

if(dir_fd == -1){

3041

perror_plus("open");

3042

}

3043

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

3044

notdotentries, alphasort);

3045

if(numentries >= 0){

3046

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

3047

if(debug){

3048

fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",

3049

dirname, direntries[i]->d_name);

3050

}

3051

dret = unlinkat(dir_fd, direntries[i]->d_name, 0);

3052

if(dret == -1){

3053

if(errno == EISDIR){

3054

dret = unlinkat(dir_fd, direntries[i]->d_name,

3055

AT_REMOVEDIR);

3056

}

3057

if((dret == -1) and (errno == ENOTEMPTY)

3058

and (strcmp(direntries[i]->d_name, "private-keys-v1.d")

3059

== 0) and (level == 0)){

3060

/* Recurse only in this special case */

3061

clean_dir_at(dir_fd, direntries[i]->d_name, level+1);

3062

dret = 0;

3063

}

3064

if(dret == -1){

3065

fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,

3066

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

3067

}

3068

}

3069

free(direntries[i]);

3070

}

3071

3072

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

3073

free(direntries);

3074

if(numentries == -1){

3075

perror_plus("scandirat");

3076

}

3077

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3078

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

3079

perror_plus("rmdir");

3080

}

3081

} else {

3082

perror_plus("scandirat");

3083

}

3084

close(dir_fd);

3085

}

3086

3087

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

3088

if(tempdir != NULL){

3089

clean_dir_at(-1, tempdir, 0);

1722

/* Take down the network interface */

1723

if(take_down_interface){

1724

/* Re-raise priviliges */

1725

errno = 0;

1726

ret = seteuid(0);

1727

if(ret == -1){

1728

perror("seteuid");

1729

}

1730

if(geteuid() == 0){

1731

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

1732

if(ret == -1){

1733

perror("ioctl SIOCGIFFLAGS");

1734

} else if(network.ifr_flags & IFF_UP) {

1735

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

1736

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

1737

if(ret == -1){

1738

perror("ioctl SIOCSIFFLAGS -IFF_UP");

1739

}

1740

}

1741

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

1742

if(ret == -1){

1743

perror("close");

1744

}

1745

/* Lower privileges permanently */

1746

errno = 0;

1747

ret = setuid(uid);

1748

if(ret == -1){

1749

perror("setuid");

1750

}

1751

}

1752

}

1753

1754

/* Removes the temp directory used by GPGME */

1755

if(tempdir_created){

1756

DIR *d;

1757

struct dirent *direntry;

1758

d = opendir(tempdir);

1759

if(d == NULL){

1760

if(errno != ENOENT){

1761

perror("opendir");

1762

}

1763

} else {

1764

while(true){

1765

direntry = readdir(d);

1766

if(direntry == NULL){

1767

break;

1768

}

1769

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

1770

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

1771

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

1772

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

1773

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

1774

continue;

1775

}

1776

char *fullname = NULL;

1777

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

1778

direntry->d_name);

1779

if(ret < 0){

1780

perror("asprintf");

1781

continue;

1782

}

1783

ret = remove(fullname);

1784

if(ret == -1){

1785

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

1786

strerror(errno));

1787

}

1788

free(fullname);

1789

}

1790

closedir(d);

1791

}

1792

ret = rmdir(tempdir);

1793

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

1794

perror("rmdir");

1795

}

3090

1796

}

3091

1797

3092

1798

if(quit_now){

3096

1802

&old_sigterm_action,

3097

1803

NULL));

3098

1804

if(ret == -1){

3099

perror_plus("sigaction");

1805

perror("sigaction");

3100

1806

}

3101

1807

do {

3102

1808

ret = raise(signal_received);

3103

1809

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

3104

1810

if(ret != 0){

3105

perror_plus("raise");

1811

perror("raise");

3106

1812

abort();

3107

1813

}

3108

1814

TEMP_FAILURE_RETRY(pause());