/mandos/trunk : revision 505.1.10

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

10

*

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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

32

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

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

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program_invocation_short_name */

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

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*/

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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, inet_ntop() */

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

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

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argp_state, struct argp,

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raise() */

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#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,

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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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#include <sys/wait.h> /* waitpid(), WIFEXITED(),

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WEXITSTATUS(), WTERMSIG() */

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#include <grp.h> /* setgroups() */

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

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argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

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argz_count() */

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

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EAI_SYSTEM, gai_strerror() */

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#ifdef __linux__

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

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108

init_gnutls_session(),

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109

GNUTLS_* */

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#include <gnutls/openpgp.h>

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* GPGME */

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

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

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#define SECKEY "seckey.txt"

135

125

#define PUBKEY "pubkey.txt"

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

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126

138

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bool debug = false;

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128

static const char mandos_protocol_version[] = "1";

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

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131

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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135

typedef struct server{

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136

const char *ip;

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in_port_t port;

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uint16_t port;

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AvahiIfIndex if_index;

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int af;

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struct timespec last_seen;

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

161

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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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150

unsigned int dh_bits;

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const char *priority;

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gpgme_ctx_t ctx;

168

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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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} mandos_context;

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156

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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",

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.current_server = NULL };

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162

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sig_atomic_t quit_now = 0;

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164

int signal_received = 0;

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/* Function to use when printing errors */

180

167

void perror_plus(const char *print_text){

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int e = errno;

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

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169

program_invocation_short_name);

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errno = e;

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170

perror(print_text);

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}

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

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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

173

/*

199

174

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

200

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

201

176

* "buffer_length" is how much is already used.

202

177

*/

203

__attribute__((nonnull, warn_unused_result))

204

178

size_t incbuffer(char **buffer, size_t buffer_length,

205

size_t buffer_capacity){

179

size_t buffer_capacity){

206

180

if(buffer_length + BUFFER_SIZE > buffer_capacity){

207

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

208

if(new_buf == NULL){

209

int old_errno = errno;

210

free(*buffer);

211

errno = old_errno;

212

*buffer = NULL;

181

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

182

if(buffer == NULL){

213

183

return 0;

214

184

}

215

*buffer = new_buf;

216

185

buffer_capacity += BUFFER_SIZE;

217

186

}

218

187

return buffer_capacity;

219

188

}

220

189

221

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

222

__attribute__((nonnull, warn_unused_result))

223

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

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int af, server **current_server){

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int add_server(const char *ip, uint16_t port,

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AvahiIfIndex if_index,

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int af){

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194

int ret;

226

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

227

196

if(new_server == NULL){

228

197

perror_plus("malloc");

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return false;

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return -1;

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199

}

231

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

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.port = port,

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.if_index = if_index,

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.af = af };

201

.port = port,

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.if_index = if_index,

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.af = af };

235

204

if(new_server->ip == NULL){

236

205

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;

206

return -1;

246

207

}

247

208

/* Special case of first server */

248

if(*current_server == NULL){

209

if (mc.current_server == NULL){

249

210

new_server->next = new_server;

250

211

new_server->prev = new_server;

251

*current_server = new_server;

212

mc.current_server = new_server;

213

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

252

214

} else {

253

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

254

new_server->next = *current_server;

255

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

215

new_server->next = mc.current_server;

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

256

217

new_server->prev->next = new_server;

257

(*current_server)->prev = new_server;

258

}

259

return true;

218

mc.current_server->prev = new_server;

219

}

220

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

221

if(ret == -1){

222

perror_plus("clock_gettime");

223

return -1;

224

}

225

return 0;

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226

}

261

227

262

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/*

263

229

* Initialize GPGME.

264

230

*/

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__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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233

gpgme_error_t rc;

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gpgme_engine_info_t engine_info;

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236

273

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/*

274

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

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239

*/

276

bool import_key(const char * const filename){

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bool import_key(const char *filename){

277

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int ret;

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int fd;

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gpgme_data_t pgp_data;

286

250

287

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

288

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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

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}

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257

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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

259

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));

260

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

261

gpgme_strsource(rc), gpgme_strerror(rc));

298

262

return false;

299

263

}

300

264

307

271

}

308

272

309

273

if(debug){

310

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

274

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

311

275

}

312

276

313

277

/* Init GPGME */

314

278

gpgme_check_version(NULL);

315

279

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

316

280

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));

281

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

282

gpgme_strsource(rc), gpgme_strerror(rc));

319

283

return false;

320

284

}

321

285

322

286

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

323

287

rc = gpgme_get_engine_info(&engine_info);

324

288

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));

289

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

290

gpgme_strsource(rc), gpgme_strerror(rc));

327

291

return false;

328

292

}

329

293

while(engine_info != NULL){

335

299

engine_info = engine_info->next;

336

300

}

337

301

if(engine_info == NULL){

338

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

339

tempdir);

302

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

340

303

return false;

341

304

}

342

305

343

306

/* Create new GPGME "context" */

344

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

307

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

345

308

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));

309

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

310

gpgme_strsource(rc), gpgme_strerror(rc));

349

311

return false;

350

312

}

351

313

360

322

* Decrypt OpenPGP data.

361

323

* Returns -1 on error

362

324

*/

363

__attribute__((nonnull, warn_unused_result))

364

325

static ssize_t pgp_packet_decrypt(const char *cryptotext,

365

326

size_t crypto_size,

366

char **plaintext,

367

mandos_context *mc){

327

char **plaintext){

368

328

gpgme_data_t dh_crypto, dh_plain;

369

329

gpgme_error_t rc;

370

330

ssize_t ret;

372

332

ssize_t plaintext_length = 0;

373

333

374

334

if(debug){

375

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

335

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

376

336

}

377

337

378

338

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

379

339

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

380

340

0);

381

341

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));

342

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

343

gpgme_strsource(rc), gpgme_strerror(rc));

384

344

return -1;

385

345

}

386

346

387

347

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

388

348

rc = gpgme_data_new(&dh_plain);

389

349

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));

350

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

351

gpgme_strsource(rc), gpgme_strerror(rc));

393

352

gpgme_data_release(dh_crypto);

394

353

return -1;

395

354

}

396

355

397

356

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

398

357

data buffer */

399

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

358

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

400

359

if(rc != GPG_ERR_NO_ERROR){

401

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

402

gpgme_strsource(rc), gpgme_strerror(rc));

360

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

361

gpgme_strsource(rc), gpgme_strerror(rc));

403

362

plaintext_length = -1;

404

363

if(debug){

405

364

gpgme_decrypt_result_t result;

406

result = gpgme_op_decrypt_result(mc->ctx);

365

result = gpgme_op_decrypt_result(mc.ctx);

407

366

if(result == NULL){

408

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

367

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

409

368

} 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);

369

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

370

result->unsupported_algorithm);

371

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

372

result->wrong_key_usage);

414

373

if(result->file_name != NULL){

415

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

374

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

416

375

}

417

376

gpgme_recipient_t recipient;

418

377

recipient = result->recipients;

419

378

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");

379

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

380

gpgme_pubkey_algo_name(recipient->pubkey_algo));

381

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

382

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

383

recipient->status == GPG_ERR_NO_SECKEY

384

? "No" : "Yes");

427

385

recipient = recipient->next;

428

386

}

429

387

}

432

390

}

433

391

434

392

if(debug){

435

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

393

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

436

394

}

437

395

438

396

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

445

403

*plaintext = NULL;

446

404

while(true){

447

405

plaintext_capacity = incbuffer(plaintext,

448

(size_t)plaintext_length,

449

plaintext_capacity);

406

(size_t)plaintext_length,

407

plaintext_capacity);

450

408

if(plaintext_capacity == 0){

451

perror_plus("incbuffer");

452

plaintext_length = -1;

453

goto decrypt_end;

409

perror_plus("incbuffer");

410

plaintext_length = -1;

411

goto decrypt_end;

454

412

}

455

413

456

414

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

469

427

}

470

428

471

429

if(debug){

472

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

430

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

473

431

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

474

432

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

475

433

}

486

444

return plaintext_length;

487

445

}

488

446

489

__attribute__((warn_unused_result))

490

static const char *safer_gnutls_strerror(int value){

491

const char *ret = gnutls_strerror(value);

447

static const char * safer_gnutls_strerror(int value){

448

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

449

-Wunreachable-code */

492

450

if(ret == NULL)

493

451

ret = "(unknown)";

494

452

return ret;

495

453

}

496

454

497

455

/* GnuTLS log function callback */

498

__attribute__((nonnull))

499

456

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

500

457

const char* string){

501

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

458

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

502

459

}

503

460

504

__attribute__((nonnull, warn_unused_result))

505

461

static int init_gnutls_global(const char *pubkeyfilename,

506

const char *seckeyfilename,

507

mandos_context *mc){

462

const char *seckeyfilename){

508

463

int ret;

509

464

510

465

if(debug){

511

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

466

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

512

467

}

513

468

514

469

ret = gnutls_global_init();

515

470

if(ret != GNUTLS_E_SUCCESS){

516

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

517

safer_gnutls_strerror(ret));

471

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

472

safer_gnutls_strerror(ret));

518

473

return -1;

519

474

}

520

475

527

482

}

528

483

529

484

/* OpenPGP credentials */

530

ret = gnutls_certificate_allocate_credentials(&mc->cred);

485

ret = gnutls_certificate_allocate_credentials(&mc.cred);

531

486

if(ret != GNUTLS_E_SUCCESS){

532

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

533

safer_gnutls_strerror(ret));

487

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

488

safer_gnutls_strerror(ret));

534

489

gnutls_global_deinit();

535

490

return -1;

536

491

}

537

492

538

493

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);

494

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

495

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

496

seckeyfilename);

543

497

}

544

498

545

499

ret = gnutls_certificate_set_openpgp_key_file

546

(mc->cred, pubkeyfilename, seckeyfilename,

500

(mc.cred, pubkeyfilename, seckeyfilename,

547

501

GNUTLS_OPENPGP_FMT_BASE64);

548

502

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));

503

fprintf(stderr,

504

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

505

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

506

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

507

safer_gnutls_strerror(ret));

554

508

goto globalfail;

555

509

}

556

510

557

511

/* GnuTLS server initialization */

558

ret = gnutls_dh_params_init(&mc->dh_params);

512

ret = gnutls_dh_params_init(&mc.dh_params);

559

513

if(ret != GNUTLS_E_SUCCESS){

560

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

561

" initialization: %s\n",

562

safer_gnutls_strerror(ret));

514

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

515

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

563

516

goto globalfail;

564

517

}

565

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

518

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

566

519

if(ret != GNUTLS_E_SUCCESS){

567

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

568

safer_gnutls_strerror(ret));

520

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

521

safer_gnutls_strerror(ret));

569

522

goto globalfail;

570

523

}

571

524

572

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

525

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

573

526

574

527

return 0;

575

528

576

529

globalfail:

577

530

578

gnutls_certificate_free_credentials(mc->cred);

531

gnutls_certificate_free_credentials(mc.cred);

579

532

gnutls_global_deinit();

580

gnutls_dh_params_deinit(mc->dh_params);

533

gnutls_dh_params_deinit(mc.dh_params);

581

534

return -1;

582

535

}

583

536

584

__attribute__((nonnull, warn_unused_result))

585

static int init_gnutls_session(gnutls_session_t *session,

586

mandos_context *mc){

537

static int init_gnutls_session(gnutls_session_t *session){

587

538

int ret;

588

539

/* GnuTLS session creation */

589

540

do {

593

544

}

594

545

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

595

546

if(ret != GNUTLS_E_SUCCESS){

596

fprintf_plus(stderr,

597

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

598

safer_gnutls_strerror(ret));

547

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

548

safer_gnutls_strerror(ret));

599

549

}

600

550

601

551

{

602

552

const char *err;

603

553

do {

604

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

554

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

605

555

if(quit_now){

606

556

gnutls_deinit(*session);

607

557

return -1;

608

558

}

609

559

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

610

560

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));

561

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

562

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

563

safer_gnutls_strerror(ret));

614

564

gnutls_deinit(*session);

615

565

return -1;

616

566

}

618

568

619

569

do {

620

570

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

621

mc->cred);

571

mc.cred);

622

572

if(quit_now){

623

573

gnutls_deinit(*session);

624

574

return -1;

625

575

}

626

576

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

627

577

if(ret != GNUTLS_E_SUCCESS){

628

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

629

safer_gnutls_strerror(ret));

578

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

579

safer_gnutls_strerror(ret));

630

580

gnutls_deinit(*session);

631

581

return -1;

632

582

}

634

584

/* ignore client certificate if any. */

635

585

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

636

586

637

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

587

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

638

588

639

589

return 0;

640

590

}

644

594

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

645

595

646

596

/* 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,

597

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

649

598

AvahiIfIndex if_index,

650

int af, mandos_context *mc){

599

int af){

651

600

int ret, tcp_sd = -1;

652

601

ssize_t sret;

653

struct sockaddr_storage to;

602

union {

603

struct sockaddr_in in;

604

struct sockaddr_in6 in6;

605

} to;

654

606

char *buffer = NULL;

655

607

char *decrypted_buffer = NULL;

656

608

size_t buffer_length = 0;

675

627

pf = PF_INET;

676

628

break;

677

629

default:

678

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

630

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

679

631

errno = EINVAL;

680

632

return -1;

681

633

}

682

634

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);

635

ret = init_gnutls_session(&session);

716

636

if(ret != 0){

717

637

return -1;

718

638

}

719

639

720

640

if(debug){

721

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

722

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

641

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

642

"\n", ip, port);

723

643

}

724

644

725

645

tcp_sd = socket(pf, SOCK_STREAM, 0);

737

657

738

658

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

739

659

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);

660

to.in6.sin6_family = (sa_family_t)af;

661

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

742

662

} 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);

663

to.in.sin_family = (sa_family_t)af;

664

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

745

665

}

746

666

if(ret < 0 ){

747

667

int e = errno;

751

671

}

752

672

if(ret == 0){

753

673

int e = errno;

754

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

674

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

755

675

errno = e;

756

676

goto mandos_end;

757

677

}

758

678

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)){

679

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

680

-Wconversion and

681

-Wunreachable-code */

682

683

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

684

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

685

-Wunreachable-code*/

762

686

if(if_index == AVAHI_IF_UNSPEC){

763

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

764

" incomplete without a network interface\n");

687

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

688

" without a network interface\n");

765

689

errno = EINVAL;

766

690

goto mandos_end;

767

691

}

768

692

/* Set the network interface number as scope */

769

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

693

to.in6.sin6_scope_id = (uint32_t)if_index;

770

694

}

771

695

} else {

772

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

696

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

697

-Wconversion and

698

-Wunreachable-code */

773

699

}

774

700

775

701

if(quit_now){

783

709

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

784

710

perror_plus("if_indextoname");

785

711

} else {

786

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

787

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

712

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

713

ip, interface, port);

788

714

}

789

715

} else {

790

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

791

ip, (uintmax_t)port);

716

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

717

port);

792

718

}

793

719

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

794

720

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

721

const char *pcret;

795

722

if(af == AF_INET6){

796

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

797

sizeof(struct sockaddr_in6),

798

addrstr, sizeof(addrstr), NULL, 0,

799

NI_NUMERICHOST);

723

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

724

sizeof(addrstr));

800

725

} else {

801

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

802

sizeof(struct sockaddr_in),

803

addrstr, sizeof(addrstr), NULL, 0,

804

NI_NUMERICHOST);

726

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

727

sizeof(addrstr));

805

728

}

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);

729

if(pcret == NULL){

730

perror_plus("inet_ntop");

731

} else {

732

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

733

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

734

}

812

735

}

813

736

}

814

737

818

741

}

819

742

820

743

if(af == AF_INET6){

821

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

822

sizeof(struct sockaddr_in6));

744

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

823

745

} else {

824

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

825

sizeof(struct sockaddr_in));

746

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

826

747

}

827

748

if(ret < 0){

828

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

749

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

829

750

int e = errno;

830

751

perror_plus("connect");

831

752

errno = e;

843

764

while(true){

844

765

size_t out_size = strlen(out);

845

766

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

846

out_size - written));

767

out_size - written));

847

768

if(ret == -1){

848

769

int e = errno;

849

770

perror_plus("write");

869

790

}

870

791

871

792

if(debug){

872

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

793

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

873

794

}

874

795

875

796

if(quit_now){

877

798

goto mandos_end;

878

799

}

879

800

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);

801

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

802

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

885

803

886

804

if(quit_now){

887

805

errno = EINTR;

898

816

899

817

if(ret != GNUTLS_E_SUCCESS){

900

818

if(debug){

901

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

819

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

902

820

gnutls_perror(ret);

903

821

}

904

822

errno = EPROTO;

908

826

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

909

827

910

828

if(debug){

911

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

912

" %s\n", ip);

829

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

830

ip);

913

831

}

914

832

915

833

while(true){

920

838

}

921

839

922

840

buffer_capacity = incbuffer(&buffer, buffer_length,

923

buffer_capacity);

841

buffer_capacity);

924

842

if(buffer_capacity == 0){

925

843

int e = errno;

926

844

perror_plus("incbuffer");

953

871

}

954

872

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

955

873

if(ret < 0){

956

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

957

"***\n");

874

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

958

875

gnutls_perror(ret);

959

876

errno = EPROTO;

960

877

goto mandos_end;

961

878

}

962

879

break;

963

880

default:

964

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

965

" encrypted session with Mandos server\n");

881

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

882

" encrypted session with Mandos server\n");

966

883

gnutls_bye(session, GNUTLS_SHUT_RDWR);

967

884

errno = EIO;

968

885

goto mandos_end;

973

890

}

974

891

975

892

if(debug){

976

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

893

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

977

894

}

978

895

979

896

if(quit_now){

991

908

992

909

if(buffer_length > 0){

993

910

ssize_t decrypted_buffer_size;

994

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

995

&decrypted_buffer, mc);

911

decrypted_buffer_size = pgp_packet_decrypt(buffer,

912

buffer_length,

913

&decrypted_buffer);

996

914

if(decrypted_buffer_size >= 0){

997

915

998

916

written = 0;

1008

926

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

1009

927

int e = errno;

1010

928

if(debug){

1011

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

1012

strerror(errno));

929

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

930

strerror(errno));

1013

931

}

1014

932

errno = e;

1015

933

goto mandos_end;

1046

964

return retval;

1047

965

}

1048

966

1049

__attribute__((nonnull))

1050

967

static void resolve_callback(AvahiSServiceResolver *r,

1051

968

AvahiIfIndex interface,

1052

969

AvahiProtocol proto,

1060

977

AVAHI_GCC_UNUSED AvahiStringList *txt,

1061

978

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1062

979

flags,

1063

void *mc){

1064

if(r == NULL){

1065

return;

1066

}

980

AVAHI_GCC_UNUSED void* userdata){

981

assert(r);

1067

982

1068

983

/* Called whenever a service has been resolved successfully or

1069

984

timed out */

1075

990

switch(event){

1076

991

default:

1077

992

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)));

993

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

994

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

995

avahi_strerror(avahi_server_errno(mc.server)));

1083

996

break;

1084

997

1085

998

case AVAHI_RESOLVER_FOUND:

1087

1000

char ip[AVAHI_ADDRESS_STR_MAX];

1088

1001

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

1089

1002

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);

1003

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

1004

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

1005

ip, (intmax_t)interface, port);

1093

1006

}

1094

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

1095

interface,

1096

avahi_proto_to_af(proto),

1097

mc);

1007

int ret = start_mandos_communication(ip, port, interface,

1008

avahi_proto_to_af(proto));

1098

1009

if(ret == 0){

1099

avahi_simple_poll_quit(simple_poll);

1010

avahi_simple_poll_quit(mc.simple_poll);

1100

1011

} 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

}

1012

ret = add_server(ip, port, interface,

1013

avahi_proto_to_af(proto));

1107

1014

}

1108

1015

}

1109

1016

}

1119

1026

const char *domain,

1120

1027

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1121

1028

flags,

1122

void *mc){

1123

if(b == NULL){

1124

return;

1125

}

1029

AVAHI_GCC_UNUSED void* userdata){

1030

assert(b);

1126

1031

1127

1032

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

1128

1033

is removed from the LAN */

1135

1040

default:

1136

1041

case AVAHI_BROWSER_FAILURE:

1137

1042

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);

1043

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

1044

avahi_strerror(avahi_server_errno(mc.server)));

1045

avahi_simple_poll_quit(mc.simple_poll);

1142

1046

return;

1143

1047

1144

1048

case AVAHI_BROWSER_NEW:

1147

1051

the callback function is called the Avahi server will free the

1148

1052

resolver for us. */

1149

1053

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)));

1054

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

1055

name, type, domain, protocol, 0,

1056

resolve_callback, NULL) == NULL)

1057

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

1058

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

1158

1059

break;

1159

1060

1160

1061

case AVAHI_BROWSER_REMOVE:

1163

1064

case AVAHI_BROWSER_ALL_FOR_NOW:

1164

1065

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1165

1066

if(debug){

1166

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

1167

" searching...\n");

1067

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

1168

1068

}

1169

1069

break;

1170

1070

}

1179

1079

signal_received = sig;

1180

1080

int old_errno = errno;

1181

1081

/* set main loop to exit */

1182

if(simple_poll != NULL){

1183

avahi_simple_poll_quit(simple_poll);

1082

if(mc.simple_poll != NULL){

1083

avahi_simple_poll_quit(mc.simple_poll);

1184

1084

}

1185

1085

errno = old_errno;

1186

1086

}

1187

1087

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){

1088

/*

1089

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

1090

* corresponds to an acceptable network device.

1091

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

1092

*/

1093

int good_interface(const struct dirent *if_entry){

1094

ssize_t ssret;

1095

char *flagname = NULL;

1096

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

1097

return 0;

1098

}

1099

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

1100

if_entry->d_name);

1101

if(ret < 0){

1102

perror_plus("asprintf");

1103

return 0;

1104

}

1105

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

1106

if(flags_fd == -1){

1107

perror_plus("open");

1108

free(flagname);

1109

return 0;

1110

}

1111

free(flagname);

1112

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

1113

/* read line from flags_fd */

1114

ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */

1115

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

1116

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

1117

if(flagstring == NULL){

1118

perror_plus("malloc");

1119

close(flags_fd);

1120

return 0;

1121

}

1122

while(to_read > 0){

1123

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

1124

(size_t)to_read));

1125

if(ssret == -1){

1126

perror_plus("read");

1127

free(flagstring);

1128

close(flags_fd);

1129

return 0;

1130

}

1131

to_read -= ssret;

1132

if(ssret == 0){

1133

break;

1134

}

1135

}

1136

close(flags_fd);

1137

intmax_t tmpmax;

1138

char *tmp;

1139

errno = 0;

1140

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

1141

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

1142

and not (isspace(*tmp)))

1143

or tmpmax != (ifreq_flags)tmpmax){

1203

1144

if(debug){

1204

ret_errno = errno;

1205

perror_plus("ioctl SIOCGIFFLAGS");

1206

errno = ret_errno;

1145

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

1146

flagstring, if_entry->d_name);

1207

1147

}

1208

return false;

1148

free(flagstring);

1149

return 0;

1209

1150

}

1210

return true;

1211

}

1212

1213

__attribute__((nonnull, warn_unused_result))

1214

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

1215

1151

free(flagstring);

1152

ifreq_flags flags = (ifreq_flags)tmpmax;

1216

1153

/* Reject the loopback device */

1217

if(ifr->ifr_flags & IFF_LOOPBACK){

1154

if(flags & IFF_LOOPBACK){

1218

1155

if(debug){

1219

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

1220

ifname);

1156

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

1157

if_entry->d_name);

1221

1158

}

1222

return false;

1159

return 0;

1223

1160

}

1224

1161

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

1225

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

1162

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

1226

1163

if(debug){

1227

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

1228

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

1164

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

1165

if_entry->d_name);

1229

1166

}

1230

return true;

1167

return 1;

1231

1168

}

1232

1169

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

1233

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

1170

if(not (flags & IFF_BROADCAST)){

1234

1171

if(debug){

1235

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1236

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

1172

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

1173

if_entry->d_name);

1237

1174

}

1238

return false;

1175

return 0;

1239

1176

}

1240

1177

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

1241

if(ifr->ifr_flags & IFF_NOARP){

1178

if(flags & IFF_NOARP){

1242

1179

if(debug){

1243

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

1244

ifname);

1180

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

1181

if_entry->d_name);

1245

1182

}

1246

return false;

1183

return 0;

1247

1184

}

1248

1249

1185

/* Accept this device */

1250

1186

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;

1187

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

1188

if_entry->d_name);

1278

1189

}

1279

1190

return 1;

1280

1191

}

1281

1192

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

1193

int notdotentries(const struct dirent *direntry){

1318

1194

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

1319

1195

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

1325

1201

return 1;

1326

1202

}

1327

1203

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){

1204

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1386

1205

int ret;

1387

1206

struct timespec now;

1388

1207

struct timespec waited_time;

1389

1208

intmax_t block_time;

1390

1209

1391

1210

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");

1211

if(mc.current_server == NULL){

1212

if (debug){

1213

fprintf(stderr,

1214

"Wait until first server is found. No timeout!\n");

1396

1215

}

1397

1216

ret = avahi_simple_poll_iterate(s, -1);

1398

1217

} else {

1399

if(debug){

1400

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

1401

" it, or wait\n");

1218

if (debug){

1219

fprintf(stderr, "Check current_server if we should run it,"

1220

" or wait\n");

1402

1221

}

1403

1222

/* the current time */

1404

1223

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1409

1228

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

1410

1229

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

1411

1230

waited_time.tv_sec = (now.tv_sec

1412

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

1231

- mc.current_server->last_seen.tv_sec);

1413

1232

waited_time.tv_nsec = (now.tv_nsec

1414

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

1233

- mc.current_server->last_seen.tv_nsec);

1415

1234

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

1416

1235

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

1417

1236

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

1419

1238

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

1420

1239

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

1421

1240

1422

if(debug){

1423

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

1424

block_time);

1241

if (debug){

1242

fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);

1425

1243

}

1426

1244

1427

1245

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);

1246

ret = start_mandos_communication(mc.current_server->ip,

1247

mc.current_server->port,

1248

mc.current_server->if_index,

1249

mc.current_server->af);

1432

1250

if(ret == 0){

1433

avahi_simple_poll_quit(s);

1251

avahi_simple_poll_quit(mc.simple_poll);

1434

1252

return 0;

1435

1253

}

1436

1254

ret = clock_gettime(CLOCK_MONOTONIC,

1437

&mc->current_server->last_seen);

1255

&mc.current_server->last_seen);

1438

1256

if(ret == -1){

1439

1257

perror_plus("clock_gettime");

1440

1258

return -1;

1441

1259

}

1442

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

1260

mc.current_server = mc.current_server->next;

1443

1261

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

1444

1262

servers, but don't block */

1445

1263

}

1447

1265

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

1448

1266

}

1449

1267

if(ret != 0){

1450

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

1268

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

1451

1269

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

1452

1270

}

1453

1271

}

1454

1272

}

1455

1273

}

1456

1274

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;

1882

}

1883

1884

1275

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

1276

AvahiSServiceBrowser *sb = NULL;

1890

error_t ret_errno;

1277

int error;

1891

1278

int ret;

1892

1279

intmax_t tmpmax;

1893

1280

char *tmp;

1894

1281

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;

1282

const char *interface = "";

1283

struct ifreq network;

1284

int sd = -1;

1285

bool take_down_interface = false;

1286

uid_t uid;

1287

gid_t gid;

1288

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

1289

bool tempdir_created = false;

1900

1290

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1901

1291

const char *seckey = PATHDIR "/" SECKEY;

1902

1292

const char *pubkey = PATHDIR "/" PUBKEY;

1903

char *interfaces_hooks = NULL;

1904

1293

1905

1294

bool gnutls_initialized = false;

1906

1295

bool gpgme_initialized = false;

1968

1357

.group = 2 },

1969

1358

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

1970

1359

.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",

1360

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

1976

1361

.group = 2 },

1977

1362

/*

1978

1363

* These reproduce what we would get without ARGP_NO_HELP

1997

1382

connect_to = arg;

1998

1383

break;

1999

1384

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

}

1385

interface = arg;

2005

1386

break;

2006

1387

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

2007

1388

seckey = arg;

2036

1417

argp_error(state, "Bad retry interval");

2037

1418

}

2038

1419

break;

2039

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

2040

hookdir = arg;

2041

break;

2042

1420

/*

2043

1421

* These reproduce what we would get without ARGP_NO_HELP

2044

1422

*/

2050

1428

argp_state_help(state, state->out_stream,

2051

1429

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

2052

1430

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

2053

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

1431

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

2054

1432

exit(argp_err_exit_status);

2055

1433

break;

2056

1434

default:

2083

1461

{

2084

1462

/* Work around Debian bug #633582:

2085

1463

<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);

1464

struct stat st;

1465

1466

/* Re-raise priviliges */

1467

errno = 0;

1468

ret = seteuid(0);

1469

if(ret == -1){

1470

perror_plus("seteuid");

1471

}

1472

1473

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

1474

int seckey_fd = open(seckey, O_RDONLY);

1475

if(seckey_fd == -1){

1476

perror_plus("open");

1477

} else {

1478

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

1479

if(ret == -1){

1480

perror_plus("fstat");

1481

} else {

1482

if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){

1483

ret = fchown(seckey_fd, uid, gid);

1484

if(ret == -1){

1485

perror_plus("fchown");

1486

}

1487

}

1488

}

1489

TEMP_FAILURE_RETRY(close(seckey_fd));

1490

}

1491

}

1492

1493

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

1494

int pubkey_fd = open(pubkey, O_RDONLY);

1495

if(pubkey_fd == -1){

1496

perror_plus("open");

1497

} else {

1498

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

1499

if(ret == -1){

1500

perror_plus("fstat");

1501

} else {

1502

if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){

1503

ret = fchown(pubkey_fd, uid, gid);

1504

if(ret == -1){

1505

perror_plus("fchown");

1506

}

1507

}

1508

}

1509

TEMP_FAILURE_RETRY(close(pubkey_fd));

1510

}

1511

}

1512

1513

/* Lower privileges */

1514

errno = 0;

1515

ret = seteuid(uid);

1516

if(ret == -1){

1517

perror_plus("seteuid");

1518

}

2176

1519

}

2177

1520

2178

1521

if(not debug){

2179

1522

avahi_set_log_function(empty_log);

2180

1523

}

1524

1525

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

1526

struct dirent **direntries;

1527

ret = scandir(sys_class_net, &direntries, good_interface,

1528

alphasort);

1529

if(ret >= 1){

1530

/* Pick the first good interface */

1531

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

1532

if(debug){

1533

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

1534

}

1535

if(interface == NULL){

1536

perror_plus("malloc");

1537

free(direntries);

1538

exitcode = EXIT_FAILURE;

1539

goto end;

1540

}

1541

free(direntries);

1542

} else {

1543

free(direntries);

1544

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

1545

exitcode = EXIT_FAILURE;

1546

goto end;

1547

}

1548

}

2181

1549

2182

1550

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

2183

1551

from the signal handler */

2184

1552

/* Initialize the pseudo-RNG for Avahi */

2185

1553

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");

1554

mc.simple_poll = avahi_simple_poll_new();

1555

if(mc.simple_poll == NULL){

1556

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

2190

1557

exitcode = EX_UNAVAILABLE;

2191

1558

goto end;

2192

1559

}

2254

1621

}

2255

1622

}

2256

1623

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);

1624

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

1625

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

1626

if_index = (AvahiIfIndex) if_nametoindex(interface);

1627

if(if_index == 0){

1628

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

1629

exitcode = EX_UNAVAILABLE;

1630

goto end;

1631

}

1632

1633

if(quit_now){

1634

goto end;

1635

}

1636

1637

/* Re-raise priviliges */

1638

errno = 0;

1639

ret = seteuid(0);

1640

if(ret == -1){

1641

perror_plus("seteuid");

1642

}

1643

1644

#ifdef __linux__

1645

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1646

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

1647

ret = klogctl(8, NULL, 5);

1648

bool restore_loglevel = true;

1649

if(ret == -1){

1650

restore_loglevel = false;

1651

perror_plus("klogctl");

1652

}

1653

#endif /* __linux__ */

1654

1655

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1656

if(sd < 0){

1657

perror_plus("socket");

1658

exitcode = EX_OSERR;

1659

#ifdef __linux__

1660

if(restore_loglevel){

1661

ret = klogctl(7, NULL, 0);

1662

if(ret == -1){

1663

perror_plus("klogctl");

1664

}

1665

}

1666

#endif /* __linux__ */

1667

/* Lower privileges */

1668

errno = 0;

1669

ret = seteuid(uid);

1670

if(ret == -1){

1671

perror_plus("seteuid");

1672

}

1673

goto end;

1674

}

1675

strcpy(network.ifr_name, interface);

1676

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

1677

if(ret == -1){

1678

perror_plus("ioctl SIOCGIFFLAGS");

1679

#ifdef __linux__

1680

if(restore_loglevel){

1681

ret = klogctl(7, NULL, 0);

1682

if(ret == -1){

1683

perror_plus("klogctl");

1684

}

1685

}

1686

#endif /* __linux__ */

1687

exitcode = EX_OSERR;

1688

/* Lower privileges */

1689

errno = 0;

1690

ret = seteuid(uid);

1691

if(ret == -1){

1692

perror_plus("seteuid");

1693

}

1694

goto end;

1695

}

1696

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

1697

network.ifr_flags |= IFF_UP;

1698

take_down_interface = true;

1699

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

1700

if(ret == -1){

1701

take_down_interface = false;

1702

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1703

exitcode = EX_OSERR;

1704

#ifdef __linux__

1705

if(restore_loglevel){

1706

ret = klogctl(7, NULL, 0);

1707

if(ret == -1){

1708

perror_plus("klogctl");

1709

}

1710

}

1711

#endif /* __linux__ */

1712

/* Lower privileges */

1713

errno = 0;

1714

ret = seteuid(uid);

1715

if(ret == -1){

1716

perror_plus("seteuid");

1717

}

1718

goto end;

1719

}

1720

}

1721

/* Sleep checking until interface is running.

1722

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

1723

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

1724

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

1725

if(ret == -1){

1726

perror_plus("ioctl SIOCGIFFLAGS");

1727

} else if(network.ifr_flags & IFF_RUNNING){

1728

break;

1729

}

1730

struct timespec sleeptime = { .tv_nsec = 250000000 };

1731

ret = nanosleep(&sleeptime, NULL);

1732

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

1733

perror_plus("nanosleep");

1734

}

1735

}

1736

if(not take_down_interface){

1737

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

1738

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

1739

if(ret == -1){

1740

perror_plus("close");

1741

}

1742

}

1743

#ifdef __linux__

1744

if(restore_loglevel){

1745

/* Restores kernel loglevel to default */

1746

ret = klogctl(7, NULL, 0);

1747

if(ret == -1){

1748

perror_plus("klogctl");

1749

}

1750

}

1751

#endif /* __linux__ */

1752

/* Lower privileges */

1753

errno = 0;

1754

if(take_down_interface){

1755

/* Lower privileges */

1756

ret = seteuid(uid);

1757

if(ret == -1){

1758

perror_plus("seteuid");

1759

}

2279

1760

} 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);

1761

/* Lower privileges permanently */

1762

ret = setuid(uid);

1763

if(ret == -1){

1764

perror_plus("setuid");

1765

}

1766

}

2337

1767

}

2338

1768

2339

1769

if(quit_now){

2340

1770

goto end;

2341

1771

}

2342

1772

2343

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

1773

ret = init_gnutls_global(pubkey, seckey);

2344

1774

if(ret == -1){

2345

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

1775

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

2346

1776

exitcode = EX_UNAVAILABLE;

2347

1777

goto end;

2348

1778

} else {

2353

1783

goto end;

2354

1784

}

2355

1785

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){

1786

if(mkdtemp(tempdir) == NULL){

2366

1787

perror_plus("mkdtemp");

2367

1788

goto end;

2368

1789

}

1790

tempdir_created = true;

2369

1791

2370

1792

if(quit_now){

2371

1793

goto end;

2372

1794

}

2373

1795

2374

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

2375

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

1796

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

1797

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

2376

1798

exitcode = EX_UNAVAILABLE;

2377

1799

goto end;

2378

1800

} else {

2387

1809

/* Connect directly, do not use Zeroconf */

2388

1810

/* (Mainly meant for debugging) */

2389

1811

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

2390

2391

1812

if(address == NULL){

2392

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

1813

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

2393

1814

exitcode = EX_USAGE;

2394

1815

goto end;

2395

1816

}

2398

1819

goto end;

2399

1820

}

2400

1821

2401

in_port_t port;

1822

uint16_t port;

2402

1823

errno = 0;

2403

1824

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

2404

1825

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");

1826

or tmpmax != (uint16_t)tmpmax){

1827

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

2407

1828

exitcode = EX_USAGE;

2408

1829

goto end;

2409

1830

}

2410

1831

2411

1832

if(quit_now){

2412

1833

goto end;

2413

1834

}

2414

1835

2415

port = (in_port_t)tmpmax;

1836

port = (uint16_t)tmpmax;

2416

1837

*address = '\0';

2417

1838

/* Colon in address indicates IPv6 */

2418

1839

int af;

2434

1855

}

2435

1856

2436

1857

while(not quit_now){

2437

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

2438

&mc);

1858

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

2439

1859

if(quit_now or ret == 0){

2440

1860

break;

2441

1861

}

2442

1862

if(debug){

2443

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

2444

(int)retry_interval);

1863

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

1864

(int)retry_interval);

2445

1865

}

2446

sleep((unsigned int)retry_interval);

1866

sleep((int)retry_interval);

2447

1867

}

2448

1868

2449

if(not quit_now){

1869

if (not quit_now){

2450

1870

exitcode = EXIT_SUCCESS;

2451

1871

}

2452

1872

2453

1873

goto end;

2454

1874

}

2455

1875

2467

1887

config.publish_domain = 0;

2468

1888

2469

1889

/* Allocate a new server */

2470

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2471

&config, NULL, NULL, &ret_errno);

1890

mc.server = avahi_server_new(avahi_simple_poll_get

1891

(mc.simple_poll), &config, NULL,

1892

NULL, &error);

2472

1893

2473

1894

/* Free the Avahi configuration data */

2474

1895

avahi_server_config_free(&config);

2476

1897

2477

1898

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

2478

1899

if(mc.server == NULL){

2479

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

2480

avahi_strerror(ret_errno));

1900

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

1901

avahi_strerror(error));

2481

1902

exitcode = EX_UNAVAILABLE;

2482

1903

goto end;

2483

1904

}

2489

1910

/* Create the Avahi service browser */

2490

1911

sb = avahi_s_service_browser_new(mc.server, if_index,

2491

1912

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2492

NULL, 0, browse_callback,

2493

(void *)&mc);

1913

NULL, 0, browse_callback, NULL);

2494

1914

if(sb == NULL){

2495

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

2496

avahi_strerror(avahi_server_errno(mc.server)));

1915

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

1916

avahi_strerror(avahi_server_errno(mc.server)));

2497

1917

exitcode = EX_UNAVAILABLE;

2498

1918

goto end;

2499

1919

}

2505

1925

/* Run the main loop */

2506

1926

2507

1927

if(debug){

2508

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

1928

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

2509

1929

}

2510

2511

ret = avahi_loop_with_timeout(simple_poll,

2512

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

1930

1931

ret = avahi_loop_with_timeout(mc.simple_poll,

1932

(int)(retry_interval * 1000));

2513

1933

if(debug){

2514

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

2515

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

1934

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

1935

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

2516

1936

}

2517

1937

2518

1938

end:

2519

1939

2520

1940

if(debug){

2521

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

1941

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

2522

1942

}

2523

1943

2524

1944

/* Cleanup things */

2525

free(mc.interfaces);

2526

2527

1945

if(sb != NULL)

2528

1946

avahi_s_service_browser_free(sb);

2529

1947

2530

1948

if(mc.server != NULL)

2531

1949

avahi_server_free(mc.server);

2532

1950

2533

if(simple_poll != NULL)

2534

avahi_simple_poll_free(simple_poll);

1951

if(mc.simple_poll != NULL)

1952

avahi_simple_poll_free(mc.simple_poll);

2535

1953

2536

1954

if(gnutls_initialized){

2537

1955

gnutls_certificate_free_credentials(mc.cred);

2542

1960

if(gpgme_initialized){

2543

1961

gpgme_release(mc.ctx);

2544

1962

}

2545

1963

2546

1964

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

2547

1965

has seen */

2548

1966

if(mc.current_server != NULL){

2554

1972

}

2555

1973

}

2556

1974

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

}

1975

/* Take down the network interface */

1976

if(take_down_interface){

1977

/* Re-raise priviliges */

1978

errno = 0;

1979

ret = seteuid(0);

1980

if(ret == -1){

1981

perror_plus("seteuid");

2586

1982

}

2587

2588

ret_errno = lower_privileges_permanently();

2589

if(ret_errno != 0){

2590

errno = ret_errno;

2591

perror_plus("Failed to lower privileges permanently");

1983

if(geteuid() == 0){

1984

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

1985

if(ret == -1){

1986

perror_plus("ioctl SIOCGIFFLAGS");

1987

} else if(network.ifr_flags & IFF_UP) {

1988

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

1989

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

1990

if(ret == -1){

1991

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1992

}

1993

}

1994

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

1995

if(ret == -1){

1996

perror_plus("close");

1997

}

1998

/* Lower privileges permanently */

1999

errno = 0;

2000

ret = setuid(uid);

2001

if(ret == -1){

2002

perror_plus("setuid");

2003

}

2592

2004

}

2593

2005

}

2594

2006

2595

free(interfaces_to_take_down);

2596

free(interfaces_hooks);

2597

2598

2007

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

2599

if(tempdir != NULL){

2008

if(tempdir_created){

2600

2009

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

}

2010

struct dirent *direntry = NULL;

2011

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

2012

alphasort);

2013

if (numentries > 0){

2014

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

2015

direntry = direntries[i];

2016

char *fullname = NULL;

2017

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

2018

direntry->d_name);

2019

if(ret < 0){

2020

perror_plus("asprintf");

2021

continue;

2022

}

2023

ret = remove(fullname);

2024

if(ret == -1){

2025

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

2026

strerror(errno));

2027

}

2028

free(fullname);

2637

2029

}

2638

TEMP_FAILURE_RETRY(close(tempdir_fd));

2030

}

2031

2032

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

2033

free(direntries);

2034

if (numentries == -1){

2035

perror_plus("scandir");

2036

}

2037

ret = rmdir(tempdir);

2038

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

2039

perror_plus("rmdir");

2639

2040

}

2640

2041

}

2641

2042