/mandos/release : revision 237.2.173

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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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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() */

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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,

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program_invocation_short_name */

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

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#include <assert.h> /* assert() */

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

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

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

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SIOCSIFFLAGS, if_indextoname(),

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if_nametoindex(), IF_NAMESIZE */

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*/

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

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

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setgid(), pause(), _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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89

#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>

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* GPGME */

125

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

133

122

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

134

123

#define SECKEY "seckey.txt"

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124

#define PUBKEY "pubkey.txt"

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

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125

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

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

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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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136

unsigned int dh_bits;

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137

gnutls_dh_params_t dh_params;

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const char *priority;

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139

gpgme_ctx_t ctx;

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server *current_server;

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char *interfaces;

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size_t interfaces_size;

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140

} mandos_context;

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141

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/* global so signal handler can reach it*/

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AvahiSimplePoll *simple_poll;

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/* global context so signal handler can reach it*/

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mandos_context mc = { .simple_poll = NULL, .server = NULL,

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.dh_bits = 1024, .priority = "SECURE256"

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

175

146

176

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sig_atomic_t quit_now = 0;

177

148

int signal_received = 0;

178

149

179

/* Function to use when printing errors */

180

void perror_plus(const char *print_text){

181

int e = errno;

182

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

183

program_invocation_short_name);

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errno = e;

185

perror(print_text);

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}

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188

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

189

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

190

va_list ap;

191

va_start (ap, format);

192

193

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

194

program_invocation_short_name));

195

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

196

}

197

198

150

/*

199

151

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

200

152

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

201

153

* "buffer_length" is how much is already used.

202

154

*/

203

__attribute__((nonnull, warn_unused_result))

204

155

size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

156

size_t buffer_capacity){

206

157

if(buffer_length + BUFFER_SIZE > buffer_capacity){

207

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

208

if(new_buf == NULL){

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int old_errno = errno;

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free(*buffer);

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errno = old_errno;

212

*buffer = NULL;

158

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

159

if(buffer == NULL){

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160

return 0;

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161

}

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*buffer = new_buf;

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162

buffer_capacity += BUFFER_SIZE;

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163

}

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164

return buffer_capacity;

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165

}

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

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__attribute__((nonnull, warn_unused_result))

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

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int af, server **current_server){

225

int ret;

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

227

if(new_server == NULL){

228

perror_plus("malloc");

229

return false;

230

}

231

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

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.port = port,

233

.if_index = if_index,

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.af = af };

235

if(new_server->ip == NULL){

236

perror_plus("strdup");

237

free(new_server);

238

return false;

239

}

240

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

241

if(ret == -1){

242

perror_plus("clock_gettime");

243

free(new_server->ip);

244

free(new_server);

245

return false;

246

}

247

/* Special case of first server */

248

if(*current_server == NULL){

249

new_server->next = new_server;

250

new_server->prev = new_server;

251

*current_server = new_server;

252

} else {

253

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

254

new_server->next = *current_server;

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

256

new_server->prev->next = new_server;

257

(*current_server)->prev = new_server;

258

}

259

return true;

260

}

261

262

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/*

263

168

* Initialize GPGME.

264

169

*/

265

__attribute__((nonnull, warn_unused_result))

266

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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/*

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

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178

*/

276

bool import_key(const char * const filename){

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bool import_key(const char *filename){

277

180

int ret;

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int fd;

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182

gpgme_data_t pgp_data;

280

183

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

282

185

if(fd == -1){

283

perror_plus("open");

186

perror("open");

284

187

return false;

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}

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189

287

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

288

191

if(rc != GPG_ERR_NO_ERROR){

289

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

292

195

}

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196

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

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rc = gpgme_op_import(mc.ctx, pgp_data);

295

198

if(rc != GPG_ERR_NO_ERROR){

296

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

298

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return false;

299

202

}

300

203

301

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

302

205

if(ret == -1){

303

perror_plus("close");

206

perror("close");

304

207

}

305

208

gpgme_data_release(pgp_data);

306

209

return true;

307

210

}

308

211

309

212

if(debug){

310

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

213

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

311

214

}

312

215

313

216

/* Init GPGME */

314

217

gpgme_check_version(NULL);

315

218

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

316

219

if(rc != GPG_ERR_NO_ERROR){

317

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

318

gpgme_strsource(rc), gpgme_strerror(rc));

220

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

221

gpgme_strsource(rc), gpgme_strerror(rc));

319

222

return false;

320

223

}

321

224

322

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

225

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

323

226

rc = gpgme_get_engine_info(&engine_info);

324

227

if(rc != GPG_ERR_NO_ERROR){

325

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

326

gpgme_strsource(rc), gpgme_strerror(rc));

228

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

229

gpgme_strsource(rc), gpgme_strerror(rc));

327

230

return false;

328

231

}

329

232

while(engine_info != NULL){

335

238

engine_info = engine_info->next;

336

239

}

337

240

if(engine_info == NULL){

338

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

339

tempdir);

241

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

340

242

return false;

341

243

}

342

244

343

245

/* Create new GPGME "context" */

344

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

246

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

345

247

if(rc != GPG_ERR_NO_ERROR){

346

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

347

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

348

gpgme_strerror(rc));

248

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

249

gpgme_strsource(rc), gpgme_strerror(rc));

349

250

return false;

350

251

}

351

252

360

261

* Decrypt OpenPGP data.

361

262

* Returns -1 on error

362

263

*/

363

__attribute__((nonnull, warn_unused_result))

364

264

static ssize_t pgp_packet_decrypt(const char *cryptotext,

365

265

size_t crypto_size,

366

char **plaintext,

367

mandos_context *mc){

266

char **plaintext){

368

267

gpgme_data_t dh_crypto, dh_plain;

369

268

gpgme_error_t rc;

370

269

ssize_t ret;

372

271

ssize_t plaintext_length = 0;

373

272

374

273

if(debug){

375

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

274

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

376

275

}

377

276

378

277

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

379

278

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

380

279

0);

381

280

if(rc != GPG_ERR_NO_ERROR){

382

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

383

gpgme_strsource(rc), gpgme_strerror(rc));

281

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

282

gpgme_strsource(rc), gpgme_strerror(rc));

384

283

return -1;

385

284

}

386

285

387

286

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

388

287

rc = gpgme_data_new(&dh_plain);

389

288

if(rc != GPG_ERR_NO_ERROR){

390

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

391

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

392

gpgme_strsource(rc), gpgme_strerror(rc));

289

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

290

gpgme_strsource(rc), gpgme_strerror(rc));

393

291

gpgme_data_release(dh_crypto);

394

292

return -1;

395

293

}

396

294

397

295

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

398

296

data buffer */

399

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

297

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

400

298

if(rc != GPG_ERR_NO_ERROR){

401

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

402

gpgme_strsource(rc), gpgme_strerror(rc));

299

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

300

gpgme_strsource(rc), gpgme_strerror(rc));

403

301

plaintext_length = -1;

404

302

if(debug){

405

303

gpgme_decrypt_result_t result;

406

result = gpgme_op_decrypt_result(mc->ctx);

304

result = gpgme_op_decrypt_result(mc.ctx);

407

305

if(result == NULL){

408

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

306

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

409

307

} else {

410

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

411

result->unsupported_algorithm);

412

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

413

result->wrong_key_usage);

308

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

309

result->unsupported_algorithm);

310

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

311

result->wrong_key_usage);

414

312

if(result->file_name != NULL){

415

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

313

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

416

314

}

417

315

gpgme_recipient_t recipient;

418

316

recipient = result->recipients;

419

317

while(recipient != NULL){

420

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

421

gpgme_pubkey_algo_name

422

(recipient->pubkey_algo));

423

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

424

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

425

recipient->status == GPG_ERR_NO_SECKEY

426

? "No" : "Yes");

318

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

319

gpgme_pubkey_algo_name(recipient->pubkey_algo));

320

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

321

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

322

recipient->status == GPG_ERR_NO_SECKEY

323

? "No" : "Yes");

427

324

recipient = recipient->next;

428

325

}

429

326

}

432

329

}

433

330

434

331

if(debug){

435

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

332

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

436

333

}

437

334

438

335

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

439

336

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

440

perror_plus("gpgme_data_seek");

337

perror("gpgme_data_seek");

441

338

plaintext_length = -1;

442

339

goto decrypt_end;

443

340

}

445

342

*plaintext = NULL;

446

343

while(true){

447

344

plaintext_capacity = incbuffer(plaintext,

448

(size_t)plaintext_length,

449

plaintext_capacity);

345

(size_t)plaintext_length,

346

plaintext_capacity);

450

347

if(plaintext_capacity == 0){

451

perror_plus("incbuffer");

452

plaintext_length = -1;

453

goto decrypt_end;

348

perror("incbuffer");

349

plaintext_length = -1;

350

goto decrypt_end;

454

351

}

455

352

456

353

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

461

358

break;

462

359

}

463

360

if(ret < 0){

464

perror_plus("gpgme_data_read");

361

perror("gpgme_data_read");

465

362

plaintext_length = -1;

466

363

goto decrypt_end;

467

364

}

469

366

}

470

367

471

368

if(debug){

472

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

369

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

473

370

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

474

371

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

475

372

}

486

383

return plaintext_length;

487

384

}

488

385

489

__attribute__((warn_unused_result))

490

static const char *safer_gnutls_strerror(int value){

491

const char *ret = gnutls_strerror(value);

386

static const char * safer_gnutls_strerror(int value){

387

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

388

-Wunreachable-code */

492

389

if(ret == NULL)

493

390

ret = "(unknown)";

494

391

return ret;

495

392

}

496

393

497

394

/* GnuTLS log function callback */

498

__attribute__((nonnull))

499

395

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

500

396

const char* string){

501

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

397

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

502

398

}

503

399

504

__attribute__((nonnull, warn_unused_result))

505

400

static int init_gnutls_global(const char *pubkeyfilename,

506

const char *seckeyfilename,

507

mandos_context *mc){

401

const char *seckeyfilename){

508

402

int ret;

509

403

510

404

if(debug){

511

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

405

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

512

406

}

513

407

514

408

ret = gnutls_global_init();

515

409

if(ret != GNUTLS_E_SUCCESS){

516

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

517

safer_gnutls_strerror(ret));

410

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

411

safer_gnutls_strerror(ret));

518

412

return -1;

519

413

}

520

414

527

421

}

528

422

529

423

/* OpenPGP credentials */

530

ret = gnutls_certificate_allocate_credentials(&mc->cred);

424

gnutls_certificate_allocate_credentials(&mc.cred);

531

425

if(ret != GNUTLS_E_SUCCESS){

532

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

533

safer_gnutls_strerror(ret));

426

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

427

from

428

-Wunreachable-code

429

*/

430

safer_gnutls_strerror(ret));

534

431

gnutls_global_deinit();

535

432

return -1;

536

433

}

537

434

538

435

if(debug){

539

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

540

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

541

pubkeyfilename,

542

seckeyfilename);

436

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

437

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

438

seckeyfilename);

543

439

}

544

440

545

441

ret = gnutls_certificate_set_openpgp_key_file

546

(mc->cred, pubkeyfilename, seckeyfilename,

442

(mc.cred, pubkeyfilename, seckeyfilename,

547

443

GNUTLS_OPENPGP_FMT_BASE64);

548

444

if(ret != GNUTLS_E_SUCCESS){

549

fprintf_plus(stderr,

550

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

551

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

552

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

553

safer_gnutls_strerror(ret));

445

fprintf(stderr,

446

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

447

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

448

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

449

safer_gnutls_strerror(ret));

554

450

goto globalfail;

555

451

}

556

452

557

453

/* GnuTLS server initialization */

558

ret = gnutls_dh_params_init(&mc->dh_params);

454

ret = gnutls_dh_params_init(&mc.dh_params);

559

455

if(ret != GNUTLS_E_SUCCESS){

560

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

561

" initialization: %s\n",

562

safer_gnutls_strerror(ret));

456

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

457

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

563

458

goto globalfail;

564

459

}

565

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

460

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

566

461

if(ret != GNUTLS_E_SUCCESS){

567

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

568

safer_gnutls_strerror(ret));

462

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

463

safer_gnutls_strerror(ret));

569

464

goto globalfail;

570

465

}

571

466

572

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

467

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

573

468

574

469

return 0;

575

470

576

471

globalfail:

577

472

578

gnutls_certificate_free_credentials(mc->cred);

473

gnutls_certificate_free_credentials(mc.cred);

579

474

gnutls_global_deinit();

580

gnutls_dh_params_deinit(mc->dh_params);

475

gnutls_dh_params_deinit(mc.dh_params);

581

476

return -1;

582

477

}

583

478

584

__attribute__((nonnull, warn_unused_result))

585

static int init_gnutls_session(gnutls_session_t *session,

586

mandos_context *mc){

479

static int init_gnutls_session(gnutls_session_t *session){

587

480

int ret;

588

481

/* GnuTLS session creation */

589

482

do {

593

486

}

594

487

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

595

488

if(ret != GNUTLS_E_SUCCESS){

596

fprintf_plus(stderr,

597

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

598

safer_gnutls_strerror(ret));

489

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

490

safer_gnutls_strerror(ret));

599

491

}

600

492

601

493

{

602

494

const char *err;

603

495

do {

604

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

496

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

605

497

if(quit_now){

606

498

gnutls_deinit(*session);

607

499

return -1;

608

500

}

609

501

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

610

502

if(ret != GNUTLS_E_SUCCESS){

611

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

612

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

613

safer_gnutls_strerror(ret));

503

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

504

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

505

safer_gnutls_strerror(ret));

614

506

gnutls_deinit(*session);

615

507

return -1;

616

508

}

618

510

619

511

do {

620

512

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

621

mc->cred);

513

mc.cred);

622

514

if(quit_now){

623

515

gnutls_deinit(*session);

624

516

return -1;

625

517

}

626

518

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

627

519

if(ret != GNUTLS_E_SUCCESS){

628

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

629

safer_gnutls_strerror(ret));

520

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

521

safer_gnutls_strerror(ret));

630

522

gnutls_deinit(*session);

631

523

return -1;

632

524

}

634

526

/* ignore client certificate if any. */

635

527

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

636

528

637

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

529

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

638

530

639

531

return 0;

640

532

}

644

536

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

645

537

646

538

/* Called when a Mandos server is found */

647

__attribute__((nonnull, warn_unused_result))

648

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

539

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

649

540

AvahiIfIndex if_index,

650

int af, mandos_context *mc){

541

int af){

651

542

int ret, tcp_sd = -1;

652

543

ssize_t sret;

653

struct sockaddr_storage to;

544

union {

545

struct sockaddr_in in;

546

struct sockaddr_in6 in6;

547

} to;

654

548

char *buffer = NULL;

655

549

char *decrypted_buffer = NULL;

656

550

size_t buffer_length = 0;

675

569

pf = PF_INET;

676

570

break;

677

571

default:

678

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

572

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

679

573

errno = EINVAL;

680

574

return -1;

681

575

}

682

576

683

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

684

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

685

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

686

bool match = false;

687

{

688

char *interface = NULL;

689

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

690

interface))){

691

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

692

match = true;

693

break;

694

}

695

}

696

}

697

if(not match){

698

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

699

connect to the server */

700

if(debug){

701

char interface[IF_NAMESIZE];

702

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

703

perror_plus("if_indextoname");

704

} else {

705

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

706

" \"%s\"\n",

707

if_indextoname((unsigned int)if_index,

708

interface));

709

}

710

}

711

return -1;

712

}

713

}

714

715

ret = init_gnutls_session(&session, mc);

577

ret = init_gnutls_session(&session);

716

578

if(ret != 0){

717

579

return -1;

718

580

}

719

581

720

582

if(debug){

721

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

722

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

583

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

584

"\n", ip, port);

723

585

}

724

586

725

587

tcp_sd = socket(pf, SOCK_STREAM, 0);

726

588

if(tcp_sd < 0){

727

589

int e = errno;

728

perror_plus("socket");

590

perror("socket");

729

591

errno = e;

730

592

goto mandos_end;

731

593

}

737

599

738

600

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

739

601

if(af == AF_INET6){

740

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

741

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

602

to.in6.sin6_family = (sa_family_t)af;

603

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

742

604

} else { /* IPv4 */

743

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

744

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

605

to.in.sin_family = (sa_family_t)af;

606

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

745

607

}

746

608

if(ret < 0 ){

747

609

int e = errno;

748

perror_plus("inet_pton");

610

perror("inet_pton");

749

611

errno = e;

750

612

goto mandos_end;

751

613

}

752

614

if(ret == 0){

753

615

int e = errno;

754

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

616

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

755

617

errno = e;

756

618

goto mandos_end;

757

619

}

758

620

if(af == AF_INET6){

759

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

760

if(IN6_IS_ADDR_LINKLOCAL

761

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

621

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

622

-Wconversion and

623

-Wunreachable-code */

624

625

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

626

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

627

-Wunreachable-code*/

762

628

if(if_index == AVAHI_IF_UNSPEC){

763

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

764

" incomplete without a network interface\n");

629

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

630

" without a network interface\n");

765

631

errno = EINVAL;

766

632

goto mandos_end;

767

633

}

768

634

/* Set the network interface number as scope */

769

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

635

to.in6.sin6_scope_id = (uint32_t)if_index;

770

636

}

771

637

} else {

772

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

638

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

639

-Wconversion and

640

-Wunreachable-code */

773

641

}

774

642

775

643

if(quit_now){

781

649

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

782

650

char interface[IF_NAMESIZE];

783

651

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

784

perror_plus("if_indextoname");

652

perror("if_indextoname");

785

653

} else {

786

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

787

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

654

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

655

ip, interface, port);

788

656

}

789

657

} else {

790

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

791

ip, (uintmax_t)port);

658

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

659

port);

792

660

}

793

661

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

794

662

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

663

const char *pcret;

795

664

if(af == AF_INET6){

796

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

797

sizeof(struct sockaddr_in6),

798

addrstr, sizeof(addrstr), NULL, 0,

799

NI_NUMERICHOST);

665

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

666

sizeof(addrstr));

800

667

} else {

801

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

802

sizeof(struct sockaddr_in),

803

addrstr, sizeof(addrstr), NULL, 0,

804

NI_NUMERICHOST);

668

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

669

sizeof(addrstr));

805

670

}

806

if(ret == EAI_SYSTEM){

807

perror_plus("getnameinfo");

808

} else if(ret != 0) {

809

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

810

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

811

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

671

if(pcret == NULL){

672

perror("inet_ntop");

673

} else {

674

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

675

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

676

}

812

677

}

813

678

}

814

679

818

683

}

819

684

820

685

if(af == AF_INET6){

821

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

822

sizeof(struct sockaddr_in6));

686

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

823

687

} else {

824

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

825

sizeof(struct sockaddr_in));

688

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

826

689

}

827

690

if(ret < 0){

828

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

829

int e = errno;

830

perror_plus("connect");

831

errno = e;

832

}

691

int e = errno;

692

perror("connect");

693

errno = e;

833

694

goto mandos_end;

834

695

}

835

696

843

704

while(true){

844

705

size_t out_size = strlen(out);

845

706

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

846

out_size - written));

707

out_size - written));

847

708

if(ret == -1){

848

709

int e = errno;

849

perror_plus("write");

710

perror("write");

850

711

errno = e;

851

712

goto mandos_end;

852

713

}

869

730

}

870

731

871

732

if(debug){

872

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

733

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

873

734

}

874

735

875

736

if(quit_now){

877

738

goto mandos_end;

878

739

}

879

740

880

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

881

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

882

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

883

gnutls_transport_set_ptr(session,

884

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

741

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

885

742

886

743

if(quit_now){

887

744

errno = EINTR;

898

755

899

756

if(ret != GNUTLS_E_SUCCESS){

900

757

if(debug){

901

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

758

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

902

759

gnutls_perror(ret);

903

760

}

904

761

errno = EPROTO;

908

765

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

909

766

910

767

if(debug){

911

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

912

" %s\n", ip);

768

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

769

ip);

913

770

}

914

771

915

772

while(true){

920

777

}

921

778

922

779

buffer_capacity = incbuffer(&buffer, buffer_length,

923

buffer_capacity);

780

buffer_capacity);

924

781

if(buffer_capacity == 0){

925

782

int e = errno;

926

perror_plus("incbuffer");

783

perror("incbuffer");

927

784

errno = e;

928

785

goto mandos_end;

929

786

}

953

810

}

954

811

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

955

812

if(ret < 0){

956

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

957

"***\n");

813

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

958

814

gnutls_perror(ret);

959

815

errno = EPROTO;

960

816

goto mandos_end;

961

817

}

962

818

break;

963

819

default:

964

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

965

" encrypted session with Mandos server\n");

820

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

821

" encrypted session with Mandos server\n");

966

822

gnutls_bye(session, GNUTLS_SHUT_RDWR);

967

823

errno = EIO;

968

824

goto mandos_end;

973

829

}

974

830

975

831

if(debug){

976

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

832

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

977

833

}

978

834

979

835

if(quit_now){

991

847

992

848

if(buffer_length > 0){

993

849

ssize_t decrypted_buffer_size;

994

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

995

&decrypted_buffer, mc);

850

decrypted_buffer_size = pgp_packet_decrypt(buffer,

851

buffer_length,

852

&decrypted_buffer);

996

853

if(decrypted_buffer_size >= 0){

997

854

998

855

written = 0;

1008

865

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

1009

866

int e = errno;

1010

867

if(debug){

1011

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

1012

strerror(errno));

868

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

869

strerror(errno));

1013

870

}

1014

871

errno = e;

1015

872

goto mandos_end;

1034

891

if(e == 0){

1035

892

e = errno;

1036

893

}

1037

perror_plus("close");

894

perror("close");

1038

895

}

1039

896

gnutls_deinit(session);

1040

errno = e;

1041

897

if(quit_now){

1042

errno = EINTR;

898

e = EINTR;

1043

899

retval = -1;

1044

900

}

901

errno = e;

1045

902

}

1046

903

return retval;

1047

904

}

1048

905

1049

__attribute__((nonnull))

1050

906

static void resolve_callback(AvahiSServiceResolver *r,

1051

907

AvahiIfIndex interface,

1052

908

AvahiProtocol proto,

1060

916

AVAHI_GCC_UNUSED AvahiStringList *txt,

1061

917

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1062

918

flags,

1063

void *mc){

1064

if(r == NULL){

1065

return;

1066

}

919

AVAHI_GCC_UNUSED void* userdata){

920

assert(r);

1067

921

1068

922

/* Called whenever a service has been resolved successfully or

1069

923

timed out */

1075

929

switch(event){

1076

930

default:

1077

931

case AVAHI_RESOLVER_FAILURE:

1078

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

1079

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

1080

domain,

1081

avahi_strerror(avahi_server_errno

1082

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

932

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

933

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

934

avahi_strerror(avahi_server_errno(mc.server)));

1083

935

break;

1084

936

1085

937

case AVAHI_RESOLVER_FOUND:

1087

939

char ip[AVAHI_ADDRESS_STR_MAX];

1088

940

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

1089

941

if(debug){

1090

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

1091

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

1092

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

942

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

943

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

944

ip, (intmax_t)interface, port);

1093

945

}

1094

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

1095

interface,

1096

avahi_proto_to_af(proto),

1097

mc);

946

int ret = start_mandos_communication(ip, port, interface,

947

avahi_proto_to_af(proto));

1098

948

if(ret == 0){

1099

avahi_simple_poll_quit(simple_poll);

1100

} else {

1101

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

1102

avahi_proto_to_af(proto),

1103

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

1104

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

1105

" list\n", name);

1106

}

949

avahi_simple_poll_quit(mc.simple_poll);

1107

950

}

1108

951

}

1109

952

}

1119

962

const char *domain,

1120

963

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1121

964

flags,

1122

void *mc){

1123

if(b == NULL){

1124

return;

1125

}

965

AVAHI_GCC_UNUSED void* userdata){

966

assert(b);

1126

967

1127

968

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

1128

969

is removed from the LAN */

1135

976

default:

1136

977

case AVAHI_BROWSER_FAILURE:

1137

978

1138

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

1139

avahi_strerror(avahi_server_errno

1140

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

1141

avahi_simple_poll_quit(simple_poll);

979

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

980

avahi_strerror(avahi_server_errno(mc.server)));

981

avahi_simple_poll_quit(mc.simple_poll);

1142

982

return;

1143

983

1144

984

case AVAHI_BROWSER_NEW:

1147

987

the callback function is called the Avahi server will free the

1148

988

resolver for us. */

1149

989

1150

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

1151

interface, protocol, name, type,

1152

domain, protocol, 0,

1153

resolve_callback, mc) == NULL)

1154

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

1155

" %s\n", name,

1156

avahi_strerror(avahi_server_errno

1157

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

990

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

991

name, type, domain, protocol, 0,

992

resolve_callback, NULL) == NULL)

993

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

994

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

1158

995

break;

1159

996

1160

997

case AVAHI_BROWSER_REMOVE:

1163

1000

case AVAHI_BROWSER_ALL_FOR_NOW:

1164

1001

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1165

1002

if(debug){

1166

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

1167

" searching...\n");

1003

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

1168

1004

}

1169

1005

break;

1170

1006

}

1171

1007

}

1172

1008

1173

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

1009

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

1174

1010

static void handle_sigterm(int sig){

1175

1011

if(quit_now){

1176

1012

return;

1178

1014

quit_now = 1;

1179

1015

signal_received = sig;

1180

1016

int old_errno = errno;

1181

/* set main loop to exit */

1182

if(simple_poll != NULL){

1183

avahi_simple_poll_quit(simple_poll);

1184

}

1185

errno = old_errno;

1186

}

1187

1188

__attribute__((nonnull, warn_unused_result))

1189

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

1190

int ret;

1191

error_t ret_errno;

1192

1193

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

1194

if(s < 0){

1195

ret_errno = errno;

1196

perror_plus("socket");

1197

errno = ret_errno;

1198

return false;

1199

}

1200

strcpy(ifr->ifr_name, ifname);

1201

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1202

if(ret == -1){

1203

if(debug){

1204

ret_errno = errno;

1205

perror_plus("ioctl SIOCGIFFLAGS");

1206

errno = ret_errno;

1207

}

1208

return false;

1209

}

1210

return true;

1211

}

1212

1213

__attribute__((nonnull, warn_unused_result))

1214

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

1215

1216

/* Reject the loopback device */

1217

if(ifr->ifr_flags & IFF_LOOPBACK){

1218

if(debug){

1219

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

1220

ifname);

1221

}

1222

return false;

1223

}

1224

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

1225

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

1226

if(debug){

1227

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

1228

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

1229

}

1230

return true;

1231

}

1232

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

1233

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

1234

if(debug){

1235

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1236

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

1237

}

1238

return false;

1239

}

1240

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

1241

if(ifr->ifr_flags & IFF_NOARP){

1242

if(debug){

1243

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

1244

ifname);

1245

}

1246

return false;

1247

}

1248

1249

/* Accept this device */

1250

if(debug){

1251

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

1252

}

1253

return true;

1254

}

1255

1256

/*

1257

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

1258

* corresponds to an acceptable network device.

1259

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

1260

*/

1261

__attribute__((nonnull, warn_unused_result))

1262

int good_interface(const struct dirent *if_entry){

1263

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

1264

return 0;

1265

}

1266

1267

struct ifreq ifr;

1268

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

1269

if(debug){

1270

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

1271

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

1272

}

1273

return 0;

1274

}

1275

1276

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

1277

return 0;

1278

}

1279

return 1;

1280

}

1281

1282

/*

1283

* This function determines if a network interface is up.

1284

*/

1285

__attribute__((nonnull, warn_unused_result))

1286

bool interface_is_up(const char *interface){

1287

struct ifreq ifr;

1288

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

1289

if(debug){

1290

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

1291

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

1292

}

1293

return false;

1294

}

1295

1296

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

1297

}

1298

1299

/*

1300

* This function determines if a network interface is running

1301

*/

1302

__attribute__((nonnull, warn_unused_result))

1303

bool interface_is_running(const char *interface){

1304

struct ifreq ifr;

1305

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

1306

if(debug){

1307

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

1308

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

1309

}

1310

return false;

1311

}

1312

1313

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

1314

}

1315

1316

__attribute__((nonnull, pure, warn_unused_result))

1317

int notdotentries(const struct dirent *direntry){

1318

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

1319

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

1320

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

1321

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

1322

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

1323

return 0;

1324

}

1325

return 1;

1326

}

1327

1328

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

1329

__attribute__((nonnull, warn_unused_result))

1330

int runnable_hook(const struct dirent *direntry){

1331

int ret;

1332

size_t sret;

1333

struct stat st;

1334

1335

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

1336

/* Empty name? */

1337

return 0;

1338

}

1339

1340

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

1341

"abcdefghijklmnopqrstuvwxyz"

1342

"0123456789"

1343

"_.-");

1344

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

1345

/* Contains non-allowed characters */

1346

if(debug){

1347

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

1348

direntry->d_name);

1349

}

1350

return 0;

1351

}

1352

1353

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

1354

if(ret == -1){

1355

if(debug){

1356

perror_plus("Could not stat hook");

1357

}

1358

return 0;

1359

}

1360

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

1361

/* Not a regular file */

1362

if(debug){

1363

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

1364

direntry->d_name);

1365

}

1366

return 0;

1367

}

1368

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

1369

/* Not executable */

1370

if(debug){

1371

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

1372

direntry->d_name);

1373

}

1374

return 0;

1375

}

1376

if(debug){

1377

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

1378

direntry->d_name);

1379

}

1380

return 1;

1381

}

1382

1383

__attribute__((nonnull, warn_unused_result))

1384

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1385

mandos_context *mc){

1386

int ret;

1387

struct timespec now;

1388

struct timespec waited_time;

1389

intmax_t block_time;

1390

1391

while(true){

1392

if(mc->current_server == NULL){

1393

if(debug){

1394

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

1395

" No timeout!\n");

1396

}

1397

ret = avahi_simple_poll_iterate(s, -1);

1398

} else {

1399

if(debug){

1400

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

1401

" it, or wait\n");

1402

}

1403

/* the current time */

1404

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1405

if(ret == -1){

1406

perror_plus("clock_gettime");

1407

return -1;

1408

}

1409

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

1410

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

1411

waited_time.tv_sec = (now.tv_sec

1412

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

1413

waited_time.tv_nsec = (now.tv_nsec

1414

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

1415

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

1416

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

1417

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

1418

block_time = ((retry_interval

1419

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

1420

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

1421

1422

if(debug){

1423

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

1424

block_time);

1425

}

1426

1427

if(block_time <= 0){

1428

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

1429

mc->current_server->port,

1430

mc->current_server->if_index,

1431

mc->current_server->af, mc);

1432

if(ret == 0){

1433

avahi_simple_poll_quit(s);

1434

return 0;

1435

}

1436

ret = clock_gettime(CLOCK_MONOTONIC,

1437

&mc->current_server->last_seen);

1438

if(ret == -1){

1439

perror_plus("clock_gettime");

1440

return -1;

1441

}

1442

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

1443

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

1444

servers, but don't block */

1445

}

1446

1447

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

1448

}

1449

if(ret != 0){

1450

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

1451

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

1452

}

1453

}

1454

}

1455

}

1456

1457

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

1458

__attribute__((warn_unused_result))

1459

error_t raise_privileges(void){

1460

error_t old_errno = errno;

1461

error_t ret_errno = 0;

1462

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

1463

ret_errno = errno;

1464

}

1465

errno = old_errno;

1466

return ret_errno;

1467

}

1468

1469

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

1470

__attribute__((warn_unused_result))

1471

error_t raise_privileges_permanently(void){

1472

error_t old_errno = errno;

1473

error_t ret_errno = raise_privileges();

1474

if(ret_errno != 0){

1475

errno = old_errno;

1476

return ret_errno;

1477

}

1478

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

1479

ret_errno = errno;

1480

}

1481

errno = old_errno;

1482

return ret_errno;

1483

}

1484

1485

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

1486

__attribute__((warn_unused_result))

1487

error_t lower_privileges(void){

1488

error_t old_errno = errno;

1489

error_t ret_errno = 0;

1490

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

1491

ret_errno = errno;

1492

}

1493

errno = old_errno;

1494

return ret_errno;

1495

}

1496

1497

/* Lower privileges permanently */

1498

__attribute__((warn_unused_result))

1499

error_t lower_privileges_permanently(void){

1500

error_t old_errno = errno;

1501

error_t ret_errno = 0;

1502

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

1503

ret_errno = errno;

1504

}

1505

errno = old_errno;

1506

return ret_errno;

1507

}

1508

1509

__attribute__((nonnull))

1510

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

1511

const float delay){

1512

struct dirent **direntries = NULL;

1513

if(hookdir_fd == -1){

1514

hookdir_fd = open(hookdir, O_RDONLY);

1515

if(hookdir_fd == -1){

1516

if(errno == ENOENT){

1517

if(debug){

1518

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

1519

" found\n", hookdir);

1520

}

1521

} else {

1522

perror_plus("open");

1523

}

1524

return;

1525

}

1526

}

1527

#ifdef __GLIBC__

1528

#if __GLIBC_PREREQ(2, 15)

1529

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

1530

runnable_hook, alphasort);

1531

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

1532

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

1533

alphasort);

1534

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

1535

#else /* not __GLIBC__ */

1536

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

1537

alphasort);

1538

#endif /* not __GLIBC__ */

1539

if(numhooks == -1){

1540

perror_plus("scandir");

1541

return;

1542

}

1543

struct dirent *direntry;

1544

int ret;

1545

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

1546

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

1547

direntry = direntries[i];

1548

if(debug){

1549

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

1550

direntry->d_name);

1551

}

1552

pid_t hook_pid = fork();

1553

if(hook_pid == 0){

1554

/* Child */

1555

/* Raise privileges */

1556

errno = raise_privileges_permanently();

1557

if(errno != 0){

1558

perror_plus("Failed to raise privileges");

1559

_exit(EX_NOPERM);

1560

}

1561

/* Set group */

1562

errno = 0;

1563

ret = setgid(0);

1564

if(ret == -1){

1565

perror_plus("setgid");

1566

_exit(EX_NOPERM);

1567

}

1568

/* Reset supplementary groups */

1569

errno = 0;

1570

ret = setgroups(0, NULL);

1571

if(ret == -1){

1572

perror_plus("setgroups");

1573

_exit(EX_NOPERM);

1574

}

1575

ret = dup2(devnull, STDIN_FILENO);

1576

if(ret == -1){

1577

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

1578

_exit(EX_OSERR);

1579

}

1580

ret = close(devnull);

1581

if(ret == -1){

1582

perror_plus("close");

1583

_exit(EX_OSERR);

1584

}

1585

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1586

if(ret == -1){

1587

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

1588

_exit(EX_OSERR);

1589

}

1590

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

1591

if(ret == -1){

1592

perror_plus("setenv");

1593

_exit(EX_OSERR);

1594

}

1595

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

1596

if(ret == -1){

1597

perror_plus("setenv");

1598

_exit(EX_OSERR);

1599

}

1600

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

1601

if(ret == -1){

1602

perror_plus("setenv");

1603

_exit(EX_OSERR);

1604

}

1605

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

1606

if(ret == -1){

1607

perror_plus("setenv");

1608

_exit(EX_OSERR);

1609

}

1610

char *delaystring;

1611

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

1612

if(ret == -1){

1613

perror_plus("asprintf");

1614

_exit(EX_OSERR);

1615

}

1616

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

1617

if(ret == -1){

1618

free(delaystring);

1619

perror_plus("setenv");

1620

_exit(EX_OSERR);

1621

}

1622

free(delaystring);

1623

if(connect_to != NULL){

1624

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

1625

if(ret == -1){

1626

perror_plus("setenv");

1627

_exit(EX_OSERR);

1628

}

1629

}

1630

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

1631

if(hook_fd == -1){

1632

perror_plus("openat");

1633

_exit(EXIT_FAILURE);

1634

}

1635

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

1636

perror_plus("close");

1637

_exit(EXIT_FAILURE);

1638

}

1639

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

1640

environ) == -1){

1641

perror_plus("fexecve");

1642

_exit(EXIT_FAILURE);

1643

}

1644

} else {

1645

int status;

1646

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

1647

perror_plus("waitpid");

1648

continue;

1649

}

1650

if(WIFEXITED(status)){

1651

if(WEXITSTATUS(status) != 0){

1652

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

1653

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

1654

WEXITSTATUS(status));

1655

continue;

1656

}

1657

} else if(WIFSIGNALED(status)){

1658

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

1659

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

1660

WTERMSIG(status));

1661

continue;

1662

} else {

1663

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

1664

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

1665

continue;

1666

}

1667

}

1668

if(debug){

1669

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

1670

direntry->d_name);

1671

}

1672

}

1673

free(direntries);

1674

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

1675

perror_plus("close");

1676

} else {

1677

hookdir_fd = -1;

1678

}

1679

close(devnull);

1680

}

1681

1682

__attribute__((nonnull, warn_unused_result))

1683

error_t bring_up_interface(const char *const interface,

1684

const float delay){

1685

error_t old_errno = errno;

1686

int ret;

1687

struct ifreq network;

1688

unsigned int if_index = if_nametoindex(interface);

1689

if(if_index == 0){

1690

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

1691

errno = old_errno;

1692

return ENXIO;

1693

}

1694

1695

if(quit_now){

1696

errno = old_errno;

1697

return EINTR;

1698

}

1699

1700

if(not interface_is_up(interface)){

1701

error_t ret_errno = 0, ioctl_errno = 0;

1702

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

1703

ret_errno = errno;

1704

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

1705

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

1706

errno = old_errno;

1707

return ret_errno;

1708

}

1709

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

1710

1711

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

1712

if(sd == -1){

1713

ret_errno = errno;

1714

perror_plus("socket");

1715

errno = old_errno;

1716

return ret_errno;

1717

}

1718

1719

if(quit_now){

1720

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

1721

if(ret == -1){

1722

perror_plus("close");

1723

}

1724

errno = old_errno;

1725

return EINTR;

1726

}

1727

1728

if(debug){

1729

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

1730

interface);

1731

}

1732

1733

/* Raise privileges */

1734

ret_errno = raise_privileges();

1735

if(ret_errno != 0){

1736

errno = ret_errno;

1737

perror_plus("Failed to raise privileges");

1738

}

1739

1740

#ifdef __linux__

1741

int ret_linux;

1742

bool restore_loglevel = false;

1743

if(ret_errno == 0){

1744

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1745

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

1746

ret_linux = klogctl(8, NULL, 5);

1747

if(ret_linux == -1){

1748

perror_plus("klogctl");

1749

} else {

1750

restore_loglevel = true;

1751

}

1752

}

1753

#endif /* __linux__ */

1754

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

1755

ioctl_errno = errno;

1756

#ifdef __linux__

1757

if(restore_loglevel){

1758

ret_linux = klogctl(7, NULL, 0);

1759

if(ret_linux == -1){

1760

perror_plus("klogctl");

1761

}

1762

}

1763

#endif /* __linux__ */

1764

1765

/* If raise_privileges() succeeded above */

1766

if(ret_errno == 0){

1767

/* Lower privileges */

1768

ret_errno = lower_privileges();

1769

if(ret_errno != 0){

1770

errno = ret_errno;

1771

perror_plus("Failed to lower privileges");

1772

}

1773

}

1774

1775

/* Close the socket */

1776

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

1777

if(ret == -1){

1778

perror_plus("close");

1779

}

1780

1781

if(ret_setflags == -1){

1782

errno = ioctl_errno;

1783

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1784

errno = old_errno;

1785

return ioctl_errno;

1786

}

1787

} else if(debug){

1788

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

1789

interface);

1790

}

1791

1792

/* Sleep checking until interface is running.

1793

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

1794

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

1795

if(interface_is_running(interface)){

1796

break;

1797

}

1798

struct timespec sleeptime = { .tv_nsec = 250000000 };

1799

ret = nanosleep(&sleeptime, NULL);

1800

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

1801

perror_plus("nanosleep");

1802

}

1803

}

1804

1805

errno = old_errno;

1806

return 0;

1807

}

1808

1809

__attribute__((nonnull, warn_unused_result))

1810

error_t take_down_interface(const char *const interface){

1811

error_t old_errno = errno;

1812

struct ifreq network;

1813

unsigned int if_index = if_nametoindex(interface);

1814

if(if_index == 0){

1815

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

1816

errno = old_errno;

1817

return ENXIO;

1818

}

1819

if(interface_is_up(interface)){

1820

error_t ret_errno = 0, ioctl_errno = 0;

1821

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

1822

ret_errno = errno;

1823

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

1824

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

1825

errno = old_errno;

1826

return ret_errno;

1827

}

1828

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

1829

1830

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

1831

if(sd == -1){

1832

ret_errno = errno;

1833

perror_plus("socket");

1834

errno = old_errno;

1835

return ret_errno;

1836

}

1837

1838

if(debug){

1839

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

1840

interface);

1841

}

1842

1843

/* Raise privileges */

1844

ret_errno = raise_privileges();

1845

if(ret_errno != 0){

1846

errno = ret_errno;

1847

perror_plus("Failed to raise privileges");

1848

}

1849

1850

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

1851

ioctl_errno = errno;

1852

1853

/* If raise_privileges() succeeded above */

1854

if(ret_errno == 0){

1855

/* Lower privileges */

1856

ret_errno = lower_privileges();

1857

if(ret_errno != 0){

1858

errno = ret_errno;

1859

perror_plus("Failed to lower privileges");

1860

}

1861

}

1862

1863

/* Close the socket */

1864

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

1865

if(ret == -1){

1866

perror_plus("close");

1867

}

1868

1869

if(ret_setflags == -1){

1870

errno = ioctl_errno;

1871

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1872

errno = old_errno;

1873

return ioctl_errno;

1874

}

1875

} else if(debug){

1876

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

1877

interface);

1878

}

1879

1880

errno = old_errno;

1881

return 0;

1017

if(mc.simple_poll != NULL){

1018

avahi_simple_poll_quit(mc.simple_poll);

1019

}

1020

errno = old_errno;

1882

1021

}

1883

1022

1884

1023

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

1885

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

1886

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

1887

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

1888

.interfaces = NULL, .interfaces_size = 0 };

1889

1024

AvahiSServiceBrowser *sb = NULL;

1890

error_t ret_errno;

1025

int error;

1891

1026

int ret;

1892

1027

intmax_t tmpmax;

1893

1028

char *tmp;

1894

1029

int exitcode = EXIT_SUCCESS;

1895

char *interfaces_to_take_down = NULL;

1896

size_t interfaces_to_take_down_size = 0;

1897

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

1898

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

1899

char *tempdir = NULL;

1030

const char *interface = "eth0";

1031

struct ifreq network;

1032

int sd = -1;

1033

bool take_down_interface = false;

1034

uid_t uid;

1035

gid_t gid;

1036

char *connect_to = NULL;

1037

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

1038

bool tempdir_created = false;

1900

1039

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1901

1040

const char *seckey = PATHDIR "/" SECKEY;

1902

1041

const char *pubkey = PATHDIR "/" PUBKEY;

1903

char *interfaces_hooks = NULL;

1904

1042

1905

1043

bool gnutls_initialized = false;

1906

1044

bool gpgme_initialized = false;

1907

1045

float delay = 2.5f;

1908

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

1909

retrying the same server again */

1910

1046

1911

1047

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1912

1048

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1918

1054

errno = 0;

1919

1055

ret = setgid(gid);

1920

1056

if(ret == -1){

1921

perror_plus("setgid");

1057

perror("setgid");

1922

1058

}

1923

1059

1924

1060

/* Lower user privileges (temporarily) */

1925

1061

errno = 0;

1926

1062

ret = seteuid(uid);

1927

1063

if(ret == -1){

1928

perror_plus("seteuid");

1064

perror("seteuid");

1929

1065

}

1930

1066

1931

1067

if(quit_now){

1966

1102

.arg = "SECONDS",

1967

1103

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

1968

1104

.group = 2 },

1969

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

1970

.arg = "SECONDS",

1971

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

1972

.group = 2 },

1973

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

1974

.arg = "DIR",

1975

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

1976

.group = 2 },

1977

1105

/*

1978

1106

* These reproduce what we would get without ARGP_NO_HELP

1979

1107

*/

1997

1125

connect_to = arg;

1998

1126

break;

1999

1127

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

2000

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

2001

arg, (int)',');

2002

if(ret_errno != 0){

2003

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

2004

}

1128

interface = arg;

2005

1129

break;

2006

1130

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

2007

1131

seckey = arg;

2027

1151

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

2028

1152

argp_error(state, "Bad delay");

2029

1153

}

2030

case 132: /* --retry */

2031

errno = 0;

2032

retry_interval = strtod(arg, &tmp);

2033

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

2034

or (retry_interval * 1000) > INT_MAX

2035

or retry_interval < 0){

2036

argp_error(state, "Bad retry interval");

2037

}

2038

break;

2039

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

2040

hookdir = arg;

2041

1154

break;

2042

1155

/*

2043

1156

* These reproduce what we would get without ARGP_NO_HELP

2050

1163

argp_state_help(state, state->out_stream,

2051

1164

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

2052

1165

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

2053

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

1166

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

2054

1167

exit(argp_err_exit_status);

2055

1168

break;

2056

1169

default:

2071

1184

case ENOMEM:

2072

1185

default:

2073

1186

errno = ret;

2074

perror_plus("argp_parse");

1187

perror("argp_parse");

2075

1188

exitcode = EX_OSERR;

2076

1189

goto end;

2077

1190

case EINVAL:

2079

1192

goto end;

2080

1193

}

2081

1194

}

2082

2083

{

2084

/* Work around Debian bug #633582:

2085

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

2086

2087

/* Re-raise privileges */

2088

ret_errno = raise_privileges();

2089

if(ret_errno != 0){

2090

errno = ret_errno;

2091

perror_plus("Failed to raise privileges");

2092

} else {

2093

struct stat st;

2094

2095

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

2096

int seckey_fd = open(seckey, O_RDONLY);

2097

if(seckey_fd == -1){

2098

perror_plus("open");

2099

} else {

2100

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

2101

if(ret == -1){

2102

perror_plus("fstat");

2103

} else {

2104

if(S_ISREG(st.st_mode)

2105

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

2106

ret = fchown(seckey_fd, uid, gid);

2107

if(ret == -1){

2108

perror_plus("fchown");

2109

}

2110

}

2111

}

2112

TEMP_FAILURE_RETRY(close(seckey_fd));

2113

}

2114

}

2115

2116

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

2117

int pubkey_fd = open(pubkey, O_RDONLY);

2118

if(pubkey_fd == -1){

2119

perror_plus("open");

2120

} else {

2121

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

2122

if(ret == -1){

2123

perror_plus("fstat");

2124

} else {

2125

if(S_ISREG(st.st_mode)

2126

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

2127

ret = fchown(pubkey_fd, uid, gid);

2128

if(ret == -1){

2129

perror_plus("fchown");

2130

}

2131

}

2132

}

2133

TEMP_FAILURE_RETRY(close(pubkey_fd));

2134

}

2135

}

2136

2137

/* Lower privileges */

2138

ret_errno = lower_privileges();

2139

if(ret_errno != 0){

2140

errno = ret_errno;

2141

perror_plus("Failed to lower privileges");

2142

}

2143

}

2144

}

2145

2146

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

2147

{

2148

char *interface = NULL;

2149

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

2150

interface))){

2151

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

2152

and if_nametoindex(interface) == 0){

2153

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

2154

fprintf_plus(stderr, "Not using nonexisting interface"

2155

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

2156

}

2157

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

2158

interface = NULL;

2159

}

2160

}

2161

}

2162

2163

/* Run network hooks */

2164

{

2165

if(mc.interfaces != NULL){

2166

interfaces_hooks = malloc(mc.interfaces_size);

2167

if(interfaces_hooks == NULL){

2168

perror_plus("malloc");

2169

goto end;

2170

}

2171

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

2172

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

2173

}

2174

run_network_hooks("start", interfaces_hooks != NULL ?

2175

interfaces_hooks : "", delay);

2176

}

2177

1195

2178

1196

if(not debug){

2179

1197

avahi_set_log_function(empty_log);

2183

1201

from the signal handler */

2184

1202

/* Initialize the pseudo-RNG for Avahi */

2185

1203

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

2186

simple_poll = avahi_simple_poll_new();

2187

if(simple_poll == NULL){

2188

fprintf_plus(stderr,

2189

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

1204

mc.simple_poll = avahi_simple_poll_new();

1205

if(mc.simple_poll == NULL){

1206

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

2190

1207

exitcode = EX_UNAVAILABLE;

2191

1208

goto end;

2192

1209

}

2194

1211

sigemptyset(&sigterm_action.sa_mask);

2195

1212

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

2196

1213

if(ret == -1){

2197

perror_plus("sigaddset");

1214

perror("sigaddset");

2198

1215

exitcode = EX_OSERR;

2199

1216

goto end;

2200

1217

}

2201

1218

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

2202

1219

if(ret == -1){

2203

perror_plus("sigaddset");

1220

perror("sigaddset");

2204

1221

exitcode = EX_OSERR;

2205

1222

goto end;

2206

1223

}

2207

1224

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

2208

1225

if(ret == -1){

2209

perror_plus("sigaddset");

1226

perror("sigaddset");

2210

1227

exitcode = EX_OSERR;

2211

1228

goto end;

2212

1229

}

2216

1233

*/

2217

1234

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

2218

1235

if(ret == -1){

2219

perror_plus("sigaction");

1236

perror("sigaction");

2220

1237

return EX_OSERR;

2221

1238

}

2222

1239

if(old_sigterm_action.sa_handler != SIG_IGN){

2223

1240

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

2224

1241

if(ret == -1){

2225

perror_plus("sigaction");

1242

perror("sigaction");

2226

1243

exitcode = EX_OSERR;

2227

1244

goto end;

2228

1245

}

2229

1246

}

2230

1247

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

2231

1248

if(ret == -1){

2232

perror_plus("sigaction");

1249

perror("sigaction");

2233

1250

return EX_OSERR;

2234

1251

}

2235

1252

if(old_sigterm_action.sa_handler != SIG_IGN){

2236

1253

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

2237

1254

if(ret == -1){

2238

perror_plus("sigaction");

1255

perror("sigaction");

2239

1256

exitcode = EX_OSERR;

2240

1257

goto end;

2241

1258

}

2242

1259

}

2243

1260

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

2244

1261

if(ret == -1){

2245

perror_plus("sigaction");

1262

perror("sigaction");

2246

1263

return EX_OSERR;

2247

1264

}

2248

1265

if(old_sigterm_action.sa_handler != SIG_IGN){

2249

1266

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

2250

1267

if(ret == -1){

2251

perror_plus("sigaction");

1268

perror("sigaction");

2252

1269

exitcode = EX_OSERR;

2253

1270

goto end;

2254

1271

}

2255

1272

}

2256

1273

2257

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

2258

if(mc.interfaces == NULL){

2259

struct dirent **direntries = NULL;

2260

/* Look for any good interfaces */

2261

ret = scandir(sys_class_net, &direntries, good_interface,

2262

alphasort);

2263

if(ret >= 1){

2264

/* Add all found interfaces to interfaces list */

2265

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

2266

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

2267

direntries[i]->d_name);

2268

if(ret_errno != 0){

2269

errno = ret_errno;

2270

perror_plus("argz_add");

2271

continue;

2272

}

2273

if(debug){

2274

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

2275

direntries[i]->d_name);

2276

}

2277

}

2278

free(direntries);

1274

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

1275

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

1276

if_index = (AvahiIfIndex) if_nametoindex(interface);

1277

if(if_index == 0){

1278

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

1279

exitcode = EX_UNAVAILABLE;

1280

goto end;

1281

}

1282

1283

if(quit_now){

1284

goto end;

1285

}

1286

1287

/* Re-raise priviliges */

1288

errno = 0;

1289

ret = seteuid(0);

1290

if(ret == -1){

1291

perror("seteuid");

1292

}

1293

1294

#ifdef __linux__

1295

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1296

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

1297

ret = klogctl(8, NULL, 5);

1298

bool restore_loglevel = true;

1299

if(ret == -1){

1300

restore_loglevel = false;

1301

perror("klogctl");

1302

}

1303

#endif /* __linux__ */

1304

1305

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1306

if(sd < 0){

1307

perror("socket");

1308

exitcode = EX_OSERR;

1309

#ifdef __linux__

1310

if(restore_loglevel){

1311

ret = klogctl(7, NULL, 0);

1312

if(ret == -1){

1313

perror("klogctl");

1314

}

1315

}

1316

#endif /* __linux__ */

1317

/* Lower privileges */

1318

errno = 0;

1319

ret = seteuid(uid);

1320

if(ret == -1){

1321

perror("seteuid");

1322

}

1323

goto end;

1324

}

1325

strcpy(network.ifr_name, interface);

1326

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

1327

if(ret == -1){

1328

perror("ioctl SIOCGIFFLAGS");

1329

#ifdef __linux__

1330

if(restore_loglevel){

1331

ret = klogctl(7, NULL, 0);

1332

if(ret == -1){

1333

perror("klogctl");

1334

}

1335

}

1336

#endif /* __linux__ */

1337

exitcode = EX_OSERR;

1338

/* Lower privileges */

1339

errno = 0;

1340

ret = seteuid(uid);

1341

if(ret == -1){

1342

perror("seteuid");

1343

}

1344

goto end;

1345

}

1346

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

1347

network.ifr_flags |= IFF_UP;

1348

take_down_interface = true;

1349

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

1350

if(ret == -1){

1351

take_down_interface = false;

1352

perror("ioctl SIOCSIFFLAGS");

1353

exitcode = EX_OSERR;

1354

#ifdef __linux__

1355

if(restore_loglevel){

1356

ret = klogctl(7, NULL, 0);

1357

if(ret == -1){

1358

perror("klogctl");

1359

}

1360

}

1361

#endif /* __linux__ */

1362

/* Lower privileges */

1363

errno = 0;

1364

ret = seteuid(uid);

1365

if(ret == -1){

1366

perror("seteuid");

1367

}

1368

goto end;

1369

}

1370

}

1371

/* sleep checking until interface is running */

1372

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

1373

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

1374

if(ret == -1){

1375

perror("ioctl SIOCGIFFLAGS");

1376

} else if(network.ifr_flags & IFF_RUNNING){

1377

break;

1378

}

1379

struct timespec sleeptime = { .tv_nsec = 250000000 };

1380

ret = nanosleep(&sleeptime, NULL);

1381

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

1382

perror("nanosleep");

1383

}

1384

}

1385

if(not take_down_interface){

1386

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

1387

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

1388

if(ret == -1){

1389

perror("close");

1390

}

1391

}

1392

#ifdef __linux__

1393

if(restore_loglevel){

1394

/* Restores kernel loglevel to default */

1395

ret = klogctl(7, NULL, 0);

1396

if(ret == -1){

1397

perror("klogctl");

1398

}

1399

}

1400

#endif /* __linux__ */

1401

/* Lower privileges */

1402

errno = 0;

1403

if(take_down_interface){

1404

/* Lower privileges */

1405

ret = seteuid(uid);

1406

if(ret == -1){

1407

perror("seteuid");

1408

}

2279

1409

} else {

2280

if(ret == 0){

2281

free(direntries);

2282

}

2283

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

2284

exitcode = EXIT_FAILURE;

2285

goto end;

2286

}

2287

}

2288

2289

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

2290

{

2291

char *interface = NULL;

2292

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

2293

interface))){

2294

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

2295

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

2296

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

2297

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

2298

interface);

2299

interface = NULL;

2300

while((interface = argz_next(mc.interfaces,

2301

mc.interfaces_size, interface))){

2302

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

2303

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

2304

interface);

2305

interface = NULL;

2306

}

2307

}

2308

break;

2309

}

2310

bool interface_was_up = interface_is_up(interface);

2311

errno = bring_up_interface(interface, delay);

2312

if(not interface_was_up){

2313

if(errno != 0){

2314

perror_plus("Failed to bring up interface");

2315

} else {

2316

errno = argz_add(&interfaces_to_take_down,

2317

&interfaces_to_take_down_size,

2318

interface);

2319

if(errno != 0){

2320

perror_plus("argz_add");

2321

}

2322

}

2323

}

2324

}

2325

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

2326

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

2327

}

2328

}

2329

2330

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

2331

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

2332

if(debug){

2333

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

2334

mc.interfaces);

2335

}

2336

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

1410

/* Lower privileges permanently */

1411

ret = setuid(uid);

1412

if(ret == -1){

1413

perror("setuid");

1414

}

1415

}

2337

1416

}

2338

1417

2339

1418

if(quit_now){

2340

1419

goto end;

2341

1420

}

2342

1421

2343

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

1422

ret = init_gnutls_global(pubkey, seckey);

2344

1423

if(ret == -1){

2345

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

1424

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

2346

1425

exitcode = EX_UNAVAILABLE;

2347

1426

goto end;

2348

1427

} else {

2353

1432

goto end;

2354

1433

}

2355

1434

2356

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

2357

tempdir = mkdtemp(run_tempdir);

2358

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

2359

if(debug){

2360

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

2361

run_tempdir, old_tempdir);

2362

}

2363

tempdir = mkdtemp(old_tempdir);

2364

}

2365

if(tempdir == NULL){

2366

perror_plus("mkdtemp");

1435

tempdir_created = true;

1436

if(mkdtemp(tempdir) == NULL){

1437

tempdir_created = false;

1438

perror("mkdtemp");

2367

1439

goto end;

2368

1440

}

2369

1441

2371

1443

goto end;

2372

1444

}

2373

1445

2374

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

2375

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

1446

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

1447

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

2376

1448

exitcode = EX_UNAVAILABLE;

2377

1449

goto end;

2378

1450

} else {

2387

1459

/* Connect directly, do not use Zeroconf */

2388

1460

/* (Mainly meant for debugging) */

2389

1461

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

2390

2391

1462

if(address == NULL){

2392

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

1463

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

2393

1464

exitcode = EX_USAGE;

2394

1465

goto end;

2395

1466

}

2398

1469

goto end;

2399

1470

}

2400

1471

2401

in_port_t port;

1472

uint16_t port;

2402

1473

errno = 0;

2403

1474

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

2404

1475

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

2405

or tmpmax != (in_port_t)tmpmax){

2406

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

1476

or tmpmax != (uint16_t)tmpmax){

1477

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

2407

1478

exitcode = EX_USAGE;

2408

1479

goto end;

2409

1480

}

2410

1481

2411

1482

if(quit_now){

2412

1483

goto end;

2413

1484

}

2414

1485

2415

port = (in_port_t)tmpmax;

1486

port = (uint16_t)tmpmax;

2416

1487

*address = '\0';

1488

address = connect_to;

2417

1489

/* Colon in address indicates IPv6 */

2418

1490

int af;

2419

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

1491

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

2420

1492

af = AF_INET6;

2421

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

2422

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

2423

{

2424

connect_to++;

2425

address[-1] = '\0';

2426

}

2427

1493

} else {

2428

1494

af = AF_INET;

2429

1495

}

2430

address = connect_to;

2431

1496

2432

1497

if(quit_now){

2433

1498

goto end;

2434

1499

}

2435

1500

2436

while(not quit_now){

2437

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

2438

&mc);

2439

if(quit_now or ret == 0){

2440

break;

2441

}

2442

if(debug){

2443

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

2444

(int)retry_interval);

2445

}

2446

sleep((unsigned int)retry_interval);

2447

}

2448

2449

if(not quit_now){

1501

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

1502

if(ret < 0){

1503

switch(errno){

1504

case ENETUNREACH:

1505

case EHOSTDOWN:

1506

case EHOSTUNREACH:

1507

exitcode = EX_NOHOST;

1508

break;

1509

case EINVAL:

1510

exitcode = EX_USAGE;

1511

break;

1512

case EIO:

1513

exitcode = EX_IOERR;

1514

break;

1515

case EPROTO:

1516

exitcode = EX_PROTOCOL;

1517

break;

1518

default:

1519

exitcode = EX_OSERR;

1520

break;

1521

}

1522

} else {

2450

1523

exitcode = EXIT_SUCCESS;

2451

1524

}

2452

2453

1525

goto end;

2454

1526

}

2455

1527

2467

1539

config.publish_domain = 0;

2468

1540

2469

1541

/* Allocate a new server */

2470

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2471

&config, NULL, NULL, &ret_errno);

1542

mc.server = avahi_server_new(avahi_simple_poll_get

1543

(mc.simple_poll), &config, NULL,

1544

NULL, &error);

2472

1545

2473

1546

/* Free the Avahi configuration data */

2474

1547

avahi_server_config_free(&config);

2476

1549

2477

1550

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

2478

1551

if(mc.server == NULL){

2479

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

2480

avahi_strerror(ret_errno));

1552

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

1553

avahi_strerror(error));

2481

1554

exitcode = EX_UNAVAILABLE;

2482

1555

goto end;

2483

1556

}

2489

1562

/* Create the Avahi service browser */

2490

1563

sb = avahi_s_service_browser_new(mc.server, if_index,

2491

1564

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2492

NULL, 0, browse_callback,

2493

(void *)&mc);

1565

NULL, 0, browse_callback, NULL);

2494

1566

if(sb == NULL){

2495

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

2496

avahi_strerror(avahi_server_errno(mc.server)));

1567

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

1568

avahi_strerror(avahi_server_errno(mc.server)));

2497

1569

exitcode = EX_UNAVAILABLE;

2498

1570

goto end;

2499

1571

}

2505

1577

/* Run the main loop */

2506

1578

2507

1579

if(debug){

2508

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

1580

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

2509

1581

}

2510

1582

2511

ret = avahi_loop_with_timeout(simple_poll,

2512

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

2513

if(debug){

2514

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

2515

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

2516

}

1583

avahi_simple_poll_loop(mc.simple_poll);

2517

1584

2518

1585

end:

2519

1586

2520

1587

if(debug){

2521

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

1588

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

2522

1589

}

2523

1590

2524

1591

/* Cleanup things */

2525

free(mc.interfaces);

2526

2527

1592

if(sb != NULL)

2528

1593

avahi_s_service_browser_free(sb);

2529

1594

2530

1595

if(mc.server != NULL)

2531

1596

avahi_server_free(mc.server);

2532

1597

2533

if(simple_poll != NULL)

2534

avahi_simple_poll_free(simple_poll);

1598

if(mc.simple_poll != NULL)

1599

avahi_simple_poll_free(mc.simple_poll);

2535

1600

2536

1601

if(gnutls_initialized){

2537

1602

gnutls_certificate_free_credentials(mc.cred);

2543

1608

gpgme_release(mc.ctx);

2544

1609

}

2545

1610

2546

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

2547

has seen */

2548

if(mc.current_server != NULL){

2549

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

2550

while(mc.current_server != NULL){

2551

server *next = mc.current_server->next;

2552

free(mc.current_server);

2553

mc.current_server = next;

2554

}

2555

}

2556

2557

/* Re-raise privileges */

2558

{

2559

ret_errno = raise_privileges();

2560

if(ret_errno != 0){

2561

errno = ret_errno;

2562

perror_plus("Failed to raise privileges");

2563

} else {

2564

2565

/* Run network hooks */

2566

run_network_hooks("stop", interfaces_hooks != NULL ?

2567

interfaces_hooks : "", delay);

2568

2569

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

2570

{

2571

char *interface = NULL;

2572

while((interface=argz_next(interfaces_to_take_down,

2573

interfaces_to_take_down_size,

2574

interface))){

2575

ret_errno = take_down_interface(interface);

2576

if(ret_errno != 0){

2577

errno = ret_errno;

2578

perror_plus("Failed to take down interface");

2579

}

2580

}

2581

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

2582

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

2583

" down\n");

2584

}

2585

}

2586

}

2587

2588

ret_errno = lower_privileges_permanently();

2589

if(ret_errno != 0){

2590

errno = ret_errno;

2591

perror_plus("Failed to lower privileges permanently");

2592

}

2593

}

2594

2595

free(interfaces_to_take_down);

2596

free(interfaces_hooks);

2597

2598

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

2599

if(tempdir != NULL){

2600

struct dirent **direntries = NULL;

2601

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

2602

O_NOFOLLOW));

2603

if(tempdir_fd == -1){

2604

perror_plus("open");

2605

} else {

2606

#ifdef __GLIBC__

2607

#if __GLIBC_PREREQ(2, 15)

2608

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

2609

notdotentries, alphasort);

2610

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

2611

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

2612

alphasort);

2613

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

2614

#else /* not __GLIBC__ */

2615

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

2616

alphasort);

2617

#endif /* not __GLIBC__ */

2618

if(numentries >= 0){

2619

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

2620

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

2621

if(ret == -1){

2622

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

2623

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

2624

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

2625

}

2626

}

2627

2628

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

2629

free(direntries);

2630

if(numentries == -1){

2631

perror_plus("scandir");

2632

}

2633

ret = rmdir(tempdir);

2634

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

2635

perror_plus("rmdir");

2636

}

2637

}

2638

TEMP_FAILURE_RETRY(close(tempdir_fd));

1611

/* Take down the network interface */

1612

if(take_down_interface){

1613

/* Re-raise priviliges */

1614

errno = 0;

1615

ret = seteuid(0);

1616

if(ret == -1){

1617

perror("seteuid");

1618

}

1619

if(geteuid() == 0){

1620

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

1621

if(ret == -1){

1622

perror("ioctl SIOCGIFFLAGS");

1623

} else if(network.ifr_flags & IFF_UP) {

1624

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

1625

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

1626

if(ret == -1){

1627

perror("ioctl SIOCSIFFLAGS");

1628

}

1629

}

1630

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

1631

if(ret == -1){

1632

perror("close");

1633

}

1634

/* Lower privileges permanently */

1635

errno = 0;

1636

ret = setuid(uid);

1637

if(ret == -1){

1638

perror("setuid");

1639

}

1640

}

1641

}

1642

1643

/* Removes the temp directory used by GPGME */

1644

if(tempdir_created){

1645

DIR *d;

1646

struct dirent *direntry;

1647

d = opendir(tempdir);

1648

if(d == NULL){

1649

if(errno != ENOENT){

1650

perror("opendir");

1651

}

1652

} else {

1653

while(true){

1654

direntry = readdir(d);

1655

if(direntry == NULL){

1656

break;

1657

}

1658

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

1659

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

1660

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

1661

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

1662

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

1663

continue;

1664

}

1665

char *fullname = NULL;

1666

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

1667

direntry->d_name);

1668

if(ret < 0){

1669

perror("asprintf");

1670

continue;

1671

}

1672

ret = remove(fullname);

1673

if(ret == -1){

1674

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

1675

strerror(errno));

1676

}

1677

free(fullname);

1678

}

1679

closedir(d);

1680

}

1681

ret = rmdir(tempdir);

1682

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

1683

perror("rmdir");

2639

1684

}

2640

1685

}

2641

1686

2646

1691

&old_sigterm_action,

2647

1692

NULL));

2648

1693

if(ret == -1){

2649

perror_plus("sigaction");

1694

perror("sigaction");

2650

1695

}

2651

1696

do {

2652

1697

ret = raise(signal_received);

2653

1698

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

2654

1699

if(ret != 0){

2655

perror_plus("raise");

1700

perror("raise");

2656

1701

abort();

2657

1702

}

2658

1703

TEMP_FAILURE_RETRY(pause());