/mandos/release : revision 237.7.241

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

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*

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* Everything else is

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*

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

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

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* along with this program. If not, see

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

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*

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

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

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*/

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

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#ifndef _LARGEFILE_SOURCE

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#define _LARGEFILE_SOURCE

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#endif

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#endif /* not _LARGEFILE_SOURCE */

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#ifndef _FILE_OFFSET_BITS

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#define _FILE_OFFSET_BITS 64

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#endif

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#endif /* not _FILE_OFFSET_BITS */

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

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#include <stdio.h> /* fprintf(), stderr, fwrite(),

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stdout, ferror(), remove() */

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

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

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

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

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strtof(), abort() */

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sockaddr_in6, PF_INET6,

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SOCK_STREAM, uid_t, gid_t, open(),

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opendir(), DIR */

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

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

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

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inet_pton(), connect() */

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inet_pton(), connect(),

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getnameinfo() */

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

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

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program_invocation_short_name */

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

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

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SIOCSIFFLAGS, if_indextoname(),

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if_nametoindex(), IF_NAMESIZE */

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*/

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

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

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setgid(), pause() */

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

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setgid(), pause(), _exit() */

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

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

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

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argp_state, struct argp,

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raise() */

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

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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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

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WEXITSTATUS(), WTERMSIG() */

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

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

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argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

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argz_count() */

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

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EAI_SYSTEM, gai_strerror() */

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#ifdef __linux__

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

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init_gnutls_session(),

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118

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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124

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

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132

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

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133

#define SECKEY "seckey.txt"

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134

#define PUBKEY "pubkey.txt"

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

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136

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bool debug = false;

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138

static const char mandos_protocol_version[] = "1";

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139

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

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

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

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

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char *connect_to = NULL;

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const char *hookdir = HOOKDIR;

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int hookdir_fd = -1;

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uid_t uid = 65534;

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gid_t gid = 65534;

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148

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

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typedef struct server{

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const char *ip;

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in_port_t port;

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AvahiIfIndex if_index;

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int af;

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struct timespec last_seen;

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struct server *next;

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struct server *prev;

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} server;

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

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typedef struct {

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AvahiSimplePoll *simple_poll;

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161

AvahiServer *server;

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162

gnutls_certificate_credentials_t cred;

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163

unsigned int dh_bits;

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164

gnutls_dh_params_t dh_params;

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165

const char *priority;

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166

gpgme_ctx_t ctx;

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server *current_server;

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char *interfaces;

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size_t interfaces_size;

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170

} mandos_context;

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171

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

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

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.dh_bits = 1024, .priority = "SECURE256"

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

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/* global so signal handler can reach it*/

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AvahiSimplePoll *simple_poll;

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174

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sig_atomic_t quit_now = 0;

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176

int signal_received = 0;

149

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178

/* Function to use when printing errors */

179

void perror_plus(const char *print_text){

180

int e = errno;

181

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

182

program_invocation_short_name);

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errno = e;

184

perror(print_text);

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}

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187

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

188

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

189

va_list ap;

190

va_start (ap, format);

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192

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

193

program_invocation_short_name));

194

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

195

}

196

150

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/*

151

198

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

152

199

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

153

200

* "buffer_length" is how much is already used.

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201

*/

202

__attribute__((nonnull, warn_unused_result))

155

203

size_t incbuffer(char **buffer, size_t buffer_length,

156

size_t buffer_capacity){

204

size_t buffer_capacity){

157

205

if(buffer_length + BUFFER_SIZE > buffer_capacity){

158

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

159

if(buffer == NULL){

206

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

207

if(new_buf == NULL){

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int old_errno = errno;

209

free(*buffer);

210

errno = old_errno;

211

*buffer = NULL;

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return 0;

161

213

}

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*buffer = new_buf;

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buffer_capacity += BUFFER_SIZE;

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216

}

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return buffer_capacity;

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218

}

166

219

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

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__attribute__((nonnull, warn_unused_result))

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

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int af, server **current_server){

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int ret;

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

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if(new_server == NULL){

227

perror_plus("malloc");

228

return false;

229

}

230

*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 };

234

if(new_server->ip == NULL){

235

perror_plus("strdup");

236

return false;

237

}

238

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

239

if(ret == -1){

240

perror_plus("clock_gettime");

241

return false;

242

}

243

/* Special case of first server */

244

if(*current_server == NULL){

245

new_server->next = new_server;

246

new_server->prev = new_server;

247

*current_server = new_server;

248

} else {

249

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

250

new_server->next = *current_server;

251

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

252

new_server->prev->next = new_server;

253

(*current_server)->prev = new_server;

254

}

255

return true;

256

}

257

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/*

168

259

* Initialize GPGME.

169

260

*/

170

static bool init_gpgme(const char *seckey,

171

const char *pubkey, const char *tempdir){

261

__attribute__((nonnull, warn_unused_result))

262

static bool init_gpgme(const char * const seckey,

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const char * const pubkey,

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const char * const tempdir,

265

mandos_context *mc){

172

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gpgme_error_t rc;

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gpgme_engine_info_t engine_info;

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/*

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

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271

*/

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bool import_key(const char *filename){

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bool import_key(const char * const filename){

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int ret;

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int fd;

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275

gpgme_data_t pgp_data;

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

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if(fd == -1){

186

perror("open");

279

perror_plus("open");

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280

return false;

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281

}

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

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284

if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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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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287

return false;

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288

}

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rc = gpgme_op_import(mc.ctx, pgp_data);

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

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if(rc != GPG_ERR_NO_ERROR){

199

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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295

}

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

205

298

if(ret == -1){

206

perror("close");

299

perror_plus("close");

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300

}

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gpgme_data_release(pgp_data);

209

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return true;

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303

}

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212

305

if(debug){

213

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

306

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

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}

215

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/* Init GPGME */

217

310

gpgme_check_version(NULL);

218

311

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

219

312

if(rc != GPG_ERR_NO_ERROR){

220

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

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gpgme_strsource(rc), gpgme_strerror(rc));

313

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

314

gpgme_strsource(rc), gpgme_strerror(rc));

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315

return false;

223

316

}

224

317

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

318

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

226

319

rc = gpgme_get_engine_info(&engine_info);

227

320

if(rc != GPG_ERR_NO_ERROR){

228

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

229

gpgme_strsource(rc), gpgme_strerror(rc));

321

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

322

gpgme_strsource(rc), gpgme_strerror(rc));

230

323

return false;

231

324

}

232

325

while(engine_info != NULL){

238

331

engine_info = engine_info->next;

239

332

}

240

333

if(engine_info == NULL){

241

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

334

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

335

tempdir);

242

336

return false;

243

337

}

244

338

245

339

/* Create new GPGME "context" */

246

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

340

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

247

341

if(rc != GPG_ERR_NO_ERROR){

248

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

249

gpgme_strsource(rc), gpgme_strerror(rc));

342

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

343

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

344

gpgme_strerror(rc));

250

345

return false;

251

346

}

252

347

261

356

* Decrypt OpenPGP data.

262

357

* Returns -1 on error

263

358

*/

359

__attribute__((nonnull, warn_unused_result))

264

360

static ssize_t pgp_packet_decrypt(const char *cryptotext,

265

361

size_t crypto_size,

266

char **plaintext){

362

char **plaintext,

363

mandos_context *mc){

267

364

gpgme_data_t dh_crypto, dh_plain;

268

365

gpgme_error_t rc;

269

366

ssize_t ret;

271

368

ssize_t plaintext_length = 0;

272

369

273

370

if(debug){

274

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

371

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

275

372

}

276

373

277

374

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

278

375

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

279

376

0);

280

377

if(rc != GPG_ERR_NO_ERROR){

281

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

282

gpgme_strsource(rc), gpgme_strerror(rc));

378

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

379

gpgme_strsource(rc), gpgme_strerror(rc));

283

380

return -1;

284

381

}

285

382

286

383

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

287

384

rc = gpgme_data_new(&dh_plain);

288

385

if(rc != GPG_ERR_NO_ERROR){

289

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

290

gpgme_strsource(rc), gpgme_strerror(rc));

386

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

387

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

388

gpgme_strsource(rc), gpgme_strerror(rc));

291

389

gpgme_data_release(dh_crypto);

292

390

return -1;

293

391

}

294

392

295

393

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

296

394

data buffer */

297

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

395

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

298

396

if(rc != GPG_ERR_NO_ERROR){

299

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

300

gpgme_strsource(rc), gpgme_strerror(rc));

397

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

398

gpgme_strsource(rc), gpgme_strerror(rc));

301

399

plaintext_length = -1;

302

400

if(debug){

303

401

gpgme_decrypt_result_t result;

304

result = gpgme_op_decrypt_result(mc.ctx);

402

result = gpgme_op_decrypt_result(mc->ctx);

305

403

if(result == NULL){

306

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

404

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

307

405

} else {

308

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

309

result->unsupported_algorithm);

310

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

311

result->wrong_key_usage);

406

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

407

result->unsupported_algorithm);

408

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

409

result->wrong_key_usage);

312

410

if(result->file_name != NULL){

313

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

411

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

314

412

}

315

413

gpgme_recipient_t recipient;

316

414

recipient = result->recipients;

317

415

while(recipient != NULL){

318

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

319

gpgme_pubkey_algo_name(recipient->pubkey_algo));

320

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

321

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

322

recipient->status == GPG_ERR_NO_SECKEY

323

? "No" : "Yes");

416

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

417

gpgme_pubkey_algo_name

418

(recipient->pubkey_algo));

419

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

420

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

421

recipient->status == GPG_ERR_NO_SECKEY

422

? "No" : "Yes");

324

423

recipient = recipient->next;

325

424

}

326

425

}

329

428

}

330

429

331

430

if(debug){

332

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

431

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

333

432

}

334

433

335

434

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

336

435

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

337

perror("gpgme_data_seek");

436

perror_plus("gpgme_data_seek");

338

437

plaintext_length = -1;

339

438

goto decrypt_end;

340

439

}

342

441

*plaintext = NULL;

343

442

while(true){

344

443

plaintext_capacity = incbuffer(plaintext,

345

(size_t)plaintext_length,

346

plaintext_capacity);

444

(size_t)plaintext_length,

445

plaintext_capacity);

347

446

if(plaintext_capacity == 0){

348

perror("incbuffer");

349

plaintext_length = -1;

350

goto decrypt_end;

447

perror_plus("incbuffer");

448

plaintext_length = -1;

449

goto decrypt_end;

351

450

}

352

451

353

452

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

358

457

break;

359

458

}

360

459

if(ret < 0){

361

perror("gpgme_data_read");

460

perror_plus("gpgme_data_read");

362

461

plaintext_length = -1;

363

462

goto decrypt_end;

364

463

}

366

465

}

367

466

368

467

if(debug){

369

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

468

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

370

469

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

371

470

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

372

471

}

383

482

return plaintext_length;

384

483

}

385

484

386

static const char * safer_gnutls_strerror(int value){

387

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

388

-Wunreachable-code */

485

__attribute__((warn_unused_result))

486

static const char *safer_gnutls_strerror(int value){

487

const char *ret = gnutls_strerror(value);

389

488

if(ret == NULL)

390

489

ret = "(unknown)";

391

490

return ret;

392

491

}

393

492

394

493

/* GnuTLS log function callback */

494

__attribute__((nonnull))

395

495

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

396

496

const char* string){

397

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

497

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

398

498

}

399

499

500

__attribute__((nonnull, warn_unused_result))

400

501

static int init_gnutls_global(const char *pubkeyfilename,

401

const char *seckeyfilename){

502

const char *seckeyfilename,

503

mandos_context *mc){

402

504

int ret;

403

505

404

506

if(debug){

405

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

507

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

406

508

}

407

509

408

510

ret = gnutls_global_init();

409

511

if(ret != GNUTLS_E_SUCCESS){

410

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

411

safer_gnutls_strerror(ret));

512

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

513

safer_gnutls_strerror(ret));

412

514

return -1;

413

515

}

414

516

421

523

}

422

524

423

525

/* OpenPGP credentials */

424

gnutls_certificate_allocate_credentials(&mc.cred);

526

ret = gnutls_certificate_allocate_credentials(&mc->cred);

425

527

if(ret != GNUTLS_E_SUCCESS){

426

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

427

from

428

-Wunreachable-code

429

*/

430

safer_gnutls_strerror(ret));

528

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

529

safer_gnutls_strerror(ret));

431

530

gnutls_global_deinit();

432

531

return -1;

433

532

}

434

533

435

534

if(debug){

436

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

437

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

438

seckeyfilename);

535

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

536

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

537

pubkeyfilename,

538

seckeyfilename);

439

539

}

440

540

441

541

ret = gnutls_certificate_set_openpgp_key_file

442

(mc.cred, pubkeyfilename, seckeyfilename,

542

(mc->cred, pubkeyfilename, seckeyfilename,

443

543

GNUTLS_OPENPGP_FMT_BASE64);

444

544

if(ret != GNUTLS_E_SUCCESS){

445

fprintf(stderr,

446

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

447

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

448

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

449

safer_gnutls_strerror(ret));

545

fprintf_plus(stderr,

546

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

547

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

548

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

549

safer_gnutls_strerror(ret));

450

550

goto globalfail;

451

551

}

452

552

453

553

/* GnuTLS server initialization */

454

ret = gnutls_dh_params_init(&mc.dh_params);

554

ret = gnutls_dh_params_init(&mc->dh_params);

455

555

if(ret != GNUTLS_E_SUCCESS){

456

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

457

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

556

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

557

" initialization: %s\n",

558

safer_gnutls_strerror(ret));

458

559

goto globalfail;

459

560

}

460

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

561

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

461

562

if(ret != GNUTLS_E_SUCCESS){

462

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

463

safer_gnutls_strerror(ret));

563

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

564

safer_gnutls_strerror(ret));

464

565

goto globalfail;

465

566

}

466

567

467

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

568

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

468

569

469

570

return 0;

470

571

471

572

globalfail:

472

573

473

gnutls_certificate_free_credentials(mc.cred);

574

gnutls_certificate_free_credentials(mc->cred);

474

575

gnutls_global_deinit();

475

gnutls_dh_params_deinit(mc.dh_params);

576

gnutls_dh_params_deinit(mc->dh_params);

476

577

return -1;

477

578

}

478

579

479

static int init_gnutls_session(gnutls_session_t *session){

580

__attribute__((nonnull, warn_unused_result))

581

static int init_gnutls_session(gnutls_session_t *session,

582

mandos_context *mc){

480

583

int ret;

481

584

/* GnuTLS session creation */

482

585

do {

486

589

}

487

590

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

488

591

if(ret != GNUTLS_E_SUCCESS){

489

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

490

safer_gnutls_strerror(ret));

592

fprintf_plus(stderr,

593

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

594

safer_gnutls_strerror(ret));

491

595

}

492

596

493

597

{

494

598

const char *err;

495

599

do {

496

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

600

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

497

601

if(quit_now){

498

602

gnutls_deinit(*session);

499

603

return -1;

500

604

}

501

605

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

502

606

if(ret != GNUTLS_E_SUCCESS){

503

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

504

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

505

safer_gnutls_strerror(ret));

607

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

608

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

609

safer_gnutls_strerror(ret));

506

610

gnutls_deinit(*session);

507

611

return -1;

508

612

}

510

614

511

615

do {

512

616

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

513

mc.cred);

617

mc->cred);

514

618

if(quit_now){

515

619

gnutls_deinit(*session);

516

620

return -1;

517

621

}

518

622

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

519

623

if(ret != GNUTLS_E_SUCCESS){

520

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

521

safer_gnutls_strerror(ret));

624

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

625

safer_gnutls_strerror(ret));

522

626

gnutls_deinit(*session);

523

627

return -1;

524

628

}

526

630

/* ignore client certificate if any. */

527

631

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

528

632

529

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

633

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

530

634

531

635

return 0;

532

636

}

536

640

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

537

641

538

642

/* Called when a Mandos server is found */

539

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

643

__attribute__((nonnull, warn_unused_result))

644

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

540

645

AvahiIfIndex if_index,

541

int af){

646

int af, mandos_context *mc){

542

647

int ret, tcp_sd = -1;

543

648

ssize_t sret;

544

union {

545

struct sockaddr_in in;

546

struct sockaddr_in6 in6;

547

} to;

649

struct sockaddr_storage to;

548

650

char *buffer = NULL;

549

651

char *decrypted_buffer = NULL;

550

652

size_t buffer_length = 0;

569

671

pf = PF_INET;

570

672

break;

571

673

default:

572

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

674

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

573

675

errno = EINVAL;

574

676

return -1;

575

677

}

576

678

577

ret = init_gnutls_session(&session);

679

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

680

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

681

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

682

bool match = false;

683

{

684

char *interface = NULL;

685

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

686

interface))){

687

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

688

match = true;

689

break;

690

}

691

}

692

}

693

if(not match){

694

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

695

connect to the server */

696

if(debug){

697

char interface[IF_NAMESIZE];

698

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

699

perror_plus("if_indextoname");

700

} else {

701

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

702

" \"%s\"\n",

703

if_indextoname((unsigned int)if_index,

704

interface));

705

}

706

}

707

return -1;

708

}

709

}

710

711

ret = init_gnutls_session(&session, mc);

578

712

if(ret != 0){

579

713

return -1;

580

714

}

581

715

582

716

if(debug){

583

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

584

"\n", ip, port);

717

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

718

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

585

719

}

586

720

587

721

tcp_sd = socket(pf, SOCK_STREAM, 0);

588

722

if(tcp_sd < 0){

589

723

int e = errno;

590

perror("socket");

724

perror_plus("socket");

591

725

errno = e;

592

726

goto mandos_end;

593

727

}

599

733

600

734

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

601

735

if(af == AF_INET6){

602

to.in6.sin6_family = (sa_family_t)af;

603

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

736

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

737

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

604

738

} else { /* IPv4 */

605

to.in.sin_family = (sa_family_t)af;

606

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

739

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

740

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

607

741

}

608

742

if(ret < 0 ){

609

743

int e = errno;

610

perror("inet_pton");

744

perror_plus("inet_pton");

611

745

errno = e;

612

746

goto mandos_end;

613

747

}

614

748

if(ret == 0){

615

749

int e = errno;

616

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

750

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

617

751

errno = e;

618

752

goto mandos_end;

619

753

}

620

754

if(af == AF_INET6){

621

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

622

-Wconversion and

623

-Wunreachable-code */

624

625

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

626

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

627

-Wunreachable-code*/

755

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

756

if(IN6_IS_ADDR_LINKLOCAL

757

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

628

758

if(if_index == AVAHI_IF_UNSPEC){

629

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

630

" without a network interface\n");

759

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

760

" incomplete without a network interface\n");

631

761

errno = EINVAL;

632

762

goto mandos_end;

633

763

}

634

764

/* Set the network interface number as scope */

635

to.in6.sin6_scope_id = (uint32_t)if_index;

765

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

636

766

}

637

767

} else {

638

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

639

-Wconversion and

640

-Wunreachable-code */

768

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

641

769

}

642

770

643

771

if(quit_now){

649

777

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

650

778

char interface[IF_NAMESIZE];

651

779

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

652

perror("if_indextoname");

780

perror_plus("if_indextoname");

653

781

} else {

654

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

655

ip, interface, port);

782

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

783

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

656

784

}

657

785

} else {

658

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

659

port);

786

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

787

ip, (uintmax_t)port);

660

788

}

661

789

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

662

790

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

663

const char *pcret;

664

791

if(af == AF_INET6){

665

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

666

sizeof(addrstr));

792

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

793

sizeof(struct sockaddr_in6),

794

addrstr, sizeof(addrstr), NULL, 0,

795

NI_NUMERICHOST);

667

796

} else {

668

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

669

sizeof(addrstr));

797

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

798

sizeof(struct sockaddr_in),

799

addrstr, sizeof(addrstr), NULL, 0,

800

NI_NUMERICHOST);

670

801

}

671

if(pcret == NULL){

672

perror("inet_ntop");

673

} else {

674

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

675

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

676

}

802

if(ret == EAI_SYSTEM){

803

perror_plus("getnameinfo");

804

} else if(ret != 0) {

805

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

806

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

807

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

677

808

}

678

809

}

679

810

683

814

}

684

815

685

816

if(af == AF_INET6){

686

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

817

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

818

sizeof(struct sockaddr_in6));

687

819

} else {

688

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

820

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

821

sizeof(struct sockaddr_in));

689

822

}

690

823

if(ret < 0){

691

int e = errno;

692

perror("connect");

693

errno = e;

824

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

825

int e = errno;

826

perror_plus("connect");

827

errno = e;

828

}

694

829

goto mandos_end;

695

830

}

696

831

704

839

while(true){

705

840

size_t out_size = strlen(out);

706

841

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

707

out_size - written));

842

out_size - written));

708

843

if(ret == -1){

709

844

int e = errno;

710

perror("write");

845

perror_plus("write");

711

846

errno = e;

712

847

goto mandos_end;

713

848

}

730

865

}

731

866

732

867

if(debug){

733

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

868

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

734

869

}

735

870

736

871

if(quit_now){

738

873

goto mandos_end;

739

874

}

740

875

741

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

876

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

877

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

878

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

879

gnutls_transport_set_ptr(session,

880

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

742

881

743

882

if(quit_now){

744

883

errno = EINTR;

755

894

756

895

if(ret != GNUTLS_E_SUCCESS){

757

896

if(debug){

758

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

897

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

759

898

gnutls_perror(ret);

760

899

}

761

900

errno = EPROTO;

765

904

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

766

905

767

906

if(debug){

768

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

769

ip);

907

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

908

" %s\n", ip);

770

909

}

771

910

772

911

while(true){

777

916

}

778

917

779

918

buffer_capacity = incbuffer(&buffer, buffer_length,

780

buffer_capacity);

919

buffer_capacity);

781

920

if(buffer_capacity == 0){

782

921

int e = errno;

783

perror("incbuffer");

922

perror_plus("incbuffer");

784

923

errno = e;

785

924

goto mandos_end;

786

925

}

810

949

}

811

950

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

812

951

if(ret < 0){

813

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

952

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

953

"***\n");

814

954

gnutls_perror(ret);

815

955

errno = EPROTO;

816

956

goto mandos_end;

817

957

}

818

958

break;

819

959

default:

820

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

821

" encrypted session with Mandos server\n");

960

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

961

" encrypted session with Mandos server\n");

822

962

gnutls_bye(session, GNUTLS_SHUT_RDWR);

823

963

errno = EIO;

824

964

goto mandos_end;

829

969

}

830

970

831

971

if(debug){

832

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

972

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

833

973

}

834

974

835

975

if(quit_now){

847

987

848

988

if(buffer_length > 0){

849

989

ssize_t decrypted_buffer_size;

850

decrypted_buffer_size = pgp_packet_decrypt(buffer,

851

buffer_length,

852

&decrypted_buffer);

990

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

991

&decrypted_buffer, mc);

853

992

if(decrypted_buffer_size >= 0){

854

993

855

994

written = 0;

865

1004

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

866

1005

int e = errno;

867

1006

if(debug){

868

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

869

strerror(errno));

1007

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

1008

strerror(errno));

870

1009

}

871

1010

errno = e;

872

1011

goto mandos_end;

891

1030

if(e == 0){

892

1031

e = errno;

893

1032

}

894

perror("close");

1033

perror_plus("close");

895

1034

}

896

1035

gnutls_deinit(session);

1036

errno = e;

897

1037

if(quit_now){

898

e = EINTR;

1038

errno = EINTR;

899

1039

retval = -1;

900

1040

}

901

errno = e;

902

1041

}

903

1042

return retval;

904

1043

}

905

1044

1045

__attribute__((nonnull))

906

1046

static void resolve_callback(AvahiSServiceResolver *r,

907

1047

AvahiIfIndex interface,

908

1048

AvahiProtocol proto,

916

1056

AVAHI_GCC_UNUSED AvahiStringList *txt,

917

1057

AVAHI_GCC_UNUSED AvahiLookupResultFlags

918

1058

flags,

919

AVAHI_GCC_UNUSED void* userdata){

920

assert(r);

1059

void *mc){

1060

if(r == NULL){

1061

return;

1062

}

921

1063

922

1064

/* Called whenever a service has been resolved successfully or

923

1065

timed out */

929

1071

switch(event){

930

1072

default:

931

1073

case AVAHI_RESOLVER_FAILURE:

932

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

933

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

934

avahi_strerror(avahi_server_errno(mc.server)));

1074

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

1075

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

1076

domain,

1077

avahi_strerror(avahi_server_errno

1078

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

935

1079

break;

936

1080

937

1081

case AVAHI_RESOLVER_FOUND:

939

1083

char ip[AVAHI_ADDRESS_STR_MAX];

940

1084

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

941

1085

if(debug){

942

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

943

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

944

ip, (intmax_t)interface, port);

1086

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

1087

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

1088

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

945

1089

}

946

int ret = start_mandos_communication(ip, port, interface,

947

avahi_proto_to_af(proto));

1090

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

1091

interface,

1092

avahi_proto_to_af(proto),

1093

mc);

948

1094

if(ret == 0){

949

avahi_simple_poll_quit(mc.simple_poll);

1095

avahi_simple_poll_quit(simple_poll);

1096

} else {

1097

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

1098

avahi_proto_to_af(proto),

1099

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

1100

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

1101

" list\n", name);

1102

}

950

1103

}

951

1104

}

952

1105

}

962

1115

const char *domain,

963

1116

AVAHI_GCC_UNUSED AvahiLookupResultFlags

964

1117

flags,

965

AVAHI_GCC_UNUSED void* userdata){

966

assert(b);

1118

void *mc){

1119

if(b == NULL){

1120

return;

1121

}

967

1122

968

1123

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

969

1124

is removed from the LAN */

976

1131

default:

977

1132

case AVAHI_BROWSER_FAILURE:

978

1133

979

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

980

avahi_strerror(avahi_server_errno(mc.server)));

981

avahi_simple_poll_quit(mc.simple_poll);

1134

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

1135

avahi_strerror(avahi_server_errno

1136

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

1137

avahi_simple_poll_quit(simple_poll);

982

1138

return;

983

1139

984

1140

case AVAHI_BROWSER_NEW:

987

1143

the callback function is called the Avahi server will free the

988

1144

resolver for us. */

989

1145

990

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

991

name, type, domain, protocol, 0,

992

resolve_callback, NULL) == NULL)

993

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

994

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

1146

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

1147

interface, protocol, name, type,

1148

domain, protocol, 0,

1149

resolve_callback, mc) == NULL)

1150

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

1151

" %s\n", name,

1152

avahi_strerror(avahi_server_errno

1153

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

995

1154

break;

996

1155

997

1156

case AVAHI_BROWSER_REMOVE:

1000

1159

case AVAHI_BROWSER_ALL_FOR_NOW:

1001

1160

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1002

1161

if(debug){

1003

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

1162

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

1163

" searching...\n");

1004

1164

}

1005

1165

break;

1006

1166

}

1007

1167

}

1008

1168

1009

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

1169

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

1010

1170

static void handle_sigterm(int sig){

1011

1171

if(quit_now){

1012

1172

return;

1014

1174

quit_now = 1;

1015

1175

signal_received = sig;

1016

1176

int old_errno = errno;

1017

if(mc.simple_poll != NULL){

1018

avahi_simple_poll_quit(mc.simple_poll);

1019

}

1020

errno = old_errno;

1177

/* set main loop to exit */

1178

if(simple_poll != NULL){

1179

avahi_simple_poll_quit(simple_poll);

1180

}

1181

errno = old_errno;

1182

}

1183

1184

__attribute__((nonnull, warn_unused_result))

1185

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

1186

int ret;

1187

error_t ret_errno;

1188

1189

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

1190

if(s < 0){

1191

ret_errno = errno;

1192

perror_plus("socket");

1193

errno = ret_errno;

1194

return false;

1195

}

1196

strcpy(ifr->ifr_name, ifname);

1197

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1198

if(ret == -1){

1199

if(debug){

1200

ret_errno = errno;

1201

perror_plus("ioctl SIOCGIFFLAGS");

1202

errno = ret_errno;

1203

}

1204

return false;

1205

}

1206

return true;

1207

}

1208

1209

__attribute__((nonnull, warn_unused_result))

1210

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

1211

1212

/* Reject the loopback device */

1213

if(ifr->ifr_flags & IFF_LOOPBACK){

1214

if(debug){

1215

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

1216

ifname);

1217

}

1218

return false;

1219

}

1220

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

1221

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

1222

if(debug){

1223

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

1224

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

1225

}

1226

return true;

1227

}

1228

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

1229

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

1230

if(debug){

1231

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1232

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

1233

}

1234

return false;

1235

}

1236

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

1237

if(ifr->ifr_flags & IFF_NOARP){

1238

if(debug){

1239

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

1240

ifname);

1241

}

1242

return false;

1243

}

1244

1245

/* Accept this device */

1246

if(debug){

1247

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

1248

}

1249

return true;

1250

}

1251

1252

/*

1253

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

1254

* corresponds to an acceptable network device.

1255

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

1256

*/

1257

__attribute__((nonnull, warn_unused_result))

1258

int good_interface(const struct dirent *if_entry){

1259

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

1260

return 0;

1261

}

1262

1263

struct ifreq ifr;

1264

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

1265

if(debug){

1266

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

1267

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

1268

}

1269

return 0;

1270

}

1271

1272

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

1273

return 0;

1274

}

1275

return 1;

1276

}

1277

1278

/*

1279

* This function determines if a network interface is up.

1280

*/

1281

__attribute__((nonnull, warn_unused_result))

1282

bool interface_is_up(const char *interface){

1283

struct ifreq ifr;

1284

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

1285

if(debug){

1286

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

1287

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

1288

}

1289

return false;

1290

}

1291

1292

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

1293

}

1294

1295

/*

1296

* This function determines if a network interface is running

1297

*/

1298

__attribute__((nonnull, warn_unused_result))

1299

bool interface_is_running(const char *interface){

1300

struct ifreq ifr;

1301

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

1302

if(debug){

1303

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

1304

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

1305

}

1306

return false;

1307

}

1308

1309

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

1310

}

1311

1312

__attribute__((nonnull, pure, warn_unused_result))

1313

int notdotentries(const struct dirent *direntry){

1314

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

1315

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

1316

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

1317

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

1318

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

1319

return 0;

1320

}

1321

return 1;

1322

}

1323

1324

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

1325

__attribute__((nonnull, warn_unused_result))

1326

int runnable_hook(const struct dirent *direntry){

1327

int ret;

1328

size_t sret;

1329

struct stat st;

1330

1331

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

1332

/* Empty name? */

1333

return 0;

1334

}

1335

1336

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

1337

"abcdefghijklmnopqrstuvwxyz"

1338

"0123456789"

1339

"_.-");

1340

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

1341

/* Contains non-allowed characters */

1342

if(debug){

1343

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

1344

direntry->d_name);

1345

}

1346

return 0;

1347

}

1348

1349

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

1350

if(ret == -1){

1351

if(debug){

1352

perror_plus("Could not stat hook");

1353

}

1354

return 0;

1355

}

1356

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

1357

/* Not a regular file */

1358

if(debug){

1359

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

1360

direntry->d_name);

1361

}

1362

return 0;

1363

}

1364

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

1365

/* Not executable */

1366

if(debug){

1367

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

1368

direntry->d_name);

1369

}

1370

return 0;

1371

}

1372

if(debug){

1373

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

1374

direntry->d_name);

1375

}

1376

return 1;

1377

}

1378

1379

__attribute__((nonnull, warn_unused_result))

1380

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1381

mandos_context *mc){

1382

int ret;

1383

struct timespec now;

1384

struct timespec waited_time;

1385

intmax_t block_time;

1386

1387

while(true){

1388

if(mc->current_server == NULL){

1389

if(debug){

1390

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

1391

" No timeout!\n");

1392

}

1393

ret = avahi_simple_poll_iterate(s, -1);

1394

} else {

1395

if(debug){

1396

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

1397

" it, or wait\n");

1398

}

1399

/* the current time */

1400

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1401

if(ret == -1){

1402

perror_plus("clock_gettime");

1403

return -1;

1404

}

1405

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

1406

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

1407

waited_time.tv_sec = (now.tv_sec

1408

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

1409

waited_time.tv_nsec = (now.tv_nsec

1410

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

1411

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

1412

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

1413

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

1414

block_time = ((retry_interval

1415

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

1416

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

1417

1418

if(debug){

1419

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

1420

block_time);

1421

}

1422

1423

if(block_time <= 0){

1424

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

1425

mc->current_server->port,

1426

mc->current_server->if_index,

1427

mc->current_server->af, mc);

1428

if(ret == 0){

1429

avahi_simple_poll_quit(s);

1430

return 0;

1431

}

1432

ret = clock_gettime(CLOCK_MONOTONIC,

1433

&mc->current_server->last_seen);

1434

if(ret == -1){

1435

perror_plus("clock_gettime");

1436

return -1;

1437

}

1438

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

1439

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

1440

servers, but don't block */

1441

}

1442

1443

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

1444

}

1445

if(ret != 0){

1446

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

1447

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

1448

}

1449

}

1450

}

1451

}

1452

1453

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

1454

__attribute__((warn_unused_result))

1455

error_t raise_privileges(void){

1456

error_t old_errno = errno;

1457

error_t ret_errno = 0;

1458

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

1459

ret_errno = errno;

1460

perror_plus("seteuid");

1461

}

1462

errno = old_errno;

1463

return ret_errno;

1464

}

1465

1466

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

1467

__attribute__((warn_unused_result))

1468

error_t raise_privileges_permanently(void){

1469

error_t old_errno = errno;

1470

error_t ret_errno = raise_privileges();

1471

if(ret_errno != 0){

1472

errno = old_errno;

1473

return ret_errno;

1474

}

1475

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

1476

ret_errno = errno;

1477

perror_plus("seteuid");

1478

}

1479

errno = old_errno;

1480

return ret_errno;

1481

}

1482

1483

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

1484

__attribute__((warn_unused_result))

1485

error_t lower_privileges(void){

1486

error_t old_errno = errno;

1487

error_t ret_errno = 0;

1488

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

1489

ret_errno = errno;

1490

perror_plus("seteuid");

1491

}

1492

errno = old_errno;

1493

return ret_errno;

1494

}

1495

1496

/* Lower privileges permanently */

1497

__attribute__((warn_unused_result))

1498

error_t lower_privileges_permanently(void){

1499

error_t old_errno = errno;

1500

error_t ret_errno = 0;

1501

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

1502

ret_errno = errno;

1503

perror_plus("setuid");

1504

}

1505

errno = old_errno;

1506

return ret_errno;

1507

}

1508

1509

#ifndef O_CLOEXEC

1510

/*

1511

* Based on the example in the GNU LibC manual chapter 13.13 "File

1512

* Descriptor Flags".

1513

| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |

1514

*/

1515

__attribute__((warn_unused_result))

1516

static int set_cloexec_flag(int fd){

1517

int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));

1518

/* If reading the flags failed, return error indication now. */

1519

if(ret < 0){

1520

return ret;

1521

}

1522

/* Store modified flag word in the descriptor. */

1523

return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,

1524

ret | FD_CLOEXEC));

1525

}

1526

#endif /* not O_CLOEXEC */

1527

1528

__attribute__((nonnull))

1529

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

1530

const float delay){

1531

struct dirent **direntries;

1532

if(hookdir_fd == -1){

1533

hookdir_fd = open(hookdir, O_RDONLY |

1534

#ifdef O_CLOEXEC

1535

O_CLOEXEC

1536

#else /* not O_CLOEXEC */

1537

0

1538

#endif /* not O_CLOEXEC */

1539

);

1540

if(hookdir_fd == -1){

1541

if(errno == ENOENT){

1542

if(debug){

1543

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

1544

" found\n", hookdir);

1545

}

1546

} else {

1547

perror_plus("open");

1548

}

1549

return;

1550

}

1551

#ifndef O_CLOEXEC

1552

if(set_cloexec_flag(hookdir_fd) < 0){

1553

perror_plus("set_cloexec_flag");

1554

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

1555

perror_plus("close");

1556

} else {

1557

hookdir_fd = -1;

1558

}

1559

return;

1560

}

1561

#endif /* not O_CLOEXEC */

1562

}

1563

#ifdef __GLIBC__

1564

#if __GLIBC_PREREQ(2, 15)

1565

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

1566

runnable_hook, alphasort);

1567

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

1568

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

1569

alphasort);

1570

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

1571

#else /* not __GLIBC__ */

1572

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

1573

alphasort);

1574

#endif /* not __GLIBC__ */

1575

if(numhooks == -1){

1576

perror_plus("scandir");

1577

return;

1578

}

1579

struct dirent *direntry;

1580

int ret;

1581

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

1582

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

1583

direntry = direntries[i];

1584

if(debug){

1585

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

1586

direntry->d_name);

1587

}

1588

pid_t hook_pid = fork();

1589

if(hook_pid == 0){

1590

/* Child */

1591

/* Raise privileges */

1592

if(raise_privileges_permanently() != 0){

1593

perror_plus("Failed to raise privileges");

1594

_exit(EX_NOPERM);

1595

}

1596

/* Set group */

1597

errno = 0;

1598

ret = setgid(0);

1599

if(ret == -1){

1600

perror_plus("setgid");

1601

_exit(EX_NOPERM);

1602

}

1603

/* Reset supplementary groups */

1604

errno = 0;

1605

ret = setgroups(0, NULL);

1606

if(ret == -1){

1607

perror_plus("setgroups");

1608

_exit(EX_NOPERM);

1609

}

1610

ret = dup2(devnull, STDIN_FILENO);

1611

if(ret == -1){

1612

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

1613

_exit(EX_OSERR);

1614

}

1615

ret = close(devnull);

1616

if(ret == -1){

1617

perror_plus("close");

1618

_exit(EX_OSERR);

1619

}

1620

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1621

if(ret == -1){

1622

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

1623

_exit(EX_OSERR);

1624

}

1625

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

1626

if(ret == -1){

1627

perror_plus("setenv");

1628

_exit(EX_OSERR);

1629

}

1630

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

1631

if(ret == -1){

1632

perror_plus("setenv");

1633

_exit(EX_OSERR);

1634

}

1635

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

1636

if(ret == -1){

1637

perror_plus("setenv");

1638

_exit(EX_OSERR);

1639

}

1640

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

1641

if(ret == -1){

1642

perror_plus("setenv");

1643

_exit(EX_OSERR);

1644

}

1645

char *delaystring;

1646

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

1647

if(ret == -1){

1648

perror_plus("asprintf");

1649

_exit(EX_OSERR);

1650

}

1651

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

1652

if(ret == -1){

1653

free(delaystring);

1654

perror_plus("setenv");

1655

_exit(EX_OSERR);

1656

}

1657

free(delaystring);

1658

if(connect_to != NULL){

1659

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

1660

if(ret == -1){

1661

perror_plus("setenv");

1662

_exit(EX_OSERR);

1663

}

1664

}

1665

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

1666

{ direntry->d_name, NULL }, environ) == -1){

1667

perror_plus("fexecve");

1668

_exit(EXIT_FAILURE);

1669

}

1670

} else {

1671

int status;

1672

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

1673

perror_plus("waitpid");

1674

continue;

1675

}

1676

if(WIFEXITED(status)){

1677

if(WEXITSTATUS(status) != 0){

1678

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

1679

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

1680

WEXITSTATUS(status));

1681

continue;

1682

}

1683

} else if(WIFSIGNALED(status)){

1684

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

1685

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

1686

WTERMSIG(status));

1687

continue;

1688

} else {

1689

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

1690

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

1691

continue;

1692

}

1693

}

1694

if(debug){

1695

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

1696

direntry->d_name);

1697

}

1698

}

1699

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

1700

perror_plus("close");

1701

} else {

1702

hookdir_fd = -1;

1703

}

1704

close(devnull);

1705

}

1706

1707

__attribute__((nonnull, warn_unused_result))

1708

error_t bring_up_interface(const char *const interface,

1709

const float delay){

1710

error_t old_errno = errno;

1711

int ret;

1712

struct ifreq network;

1713

unsigned int if_index = if_nametoindex(interface);

1714

if(if_index == 0){

1715

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

1716

errno = old_errno;

1717

return ENXIO;

1718

}

1719

1720

if(quit_now){

1721

errno = old_errno;

1722

return EINTR;

1723

}

1724

1725

if(not interface_is_up(interface)){

1726

error_t ret_errno = 0, ioctl_errno = 0;

1727

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

1728

ret_errno = errno;

1729

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

1730

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

1731

errno = old_errno;

1732

return ret_errno;

1733

}

1734

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

1735

1736

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

1737

if(sd == -1){

1738

ret_errno = errno;

1739

perror_plus("socket");

1740

errno = old_errno;

1741

return ret_errno;

1742

}

1743

1744

if(quit_now){

1745

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

1746

if(ret == -1){

1747

perror_plus("close");

1748

}

1749

errno = old_errno;

1750

return EINTR;

1751

}

1752

1753

if(debug){

1754

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

1755

interface);

1756

}

1757

1758

/* Raise privileges */

1759

ret_errno = raise_privileges();

1760

if(ret_errno != 0){

1761

perror_plus("Failed to raise privileges");

1762

}

1763

1764

#ifdef __linux__

1765

int ret_linux;

1766

bool restore_loglevel = false;

1767

if(ret_errno == 0){

1768

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1769

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

1770

ret_linux = klogctl(8, NULL, 5);

1771

if(ret_linux == -1){

1772

perror_plus("klogctl");

1773

} else {

1774

restore_loglevel = true;

1775

}

1776

}

1777

#endif /* __linux__ */

1778

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

1779

ioctl_errno = errno;

1780

#ifdef __linux__

1781

if(restore_loglevel){

1782

ret_linux = klogctl(7, NULL, 0);

1783

if(ret_linux == -1){

1784

perror_plus("klogctl");

1785

}

1786

}

1787

#endif /* __linux__ */

1788

1789

/* If raise_privileges() succeeded above */

1790

if(ret_errno == 0){

1791

/* Lower privileges */

1792

ret_errno = lower_privileges();

1793

if(ret_errno != 0){

1794

errno = ret_errno;

1795

perror_plus("Failed to lower privileges");

1796

}

1797

}

1798

1799

/* Close the socket */

1800

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

1801

if(ret == -1){

1802

perror_plus("close");

1803

}

1804

1805

if(ret_setflags == -1){

1806

errno = ioctl_errno;

1807

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1808

errno = old_errno;

1809

return ioctl_errno;

1810

}

1811

} else if(debug){

1812

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

1813

interface);

1814

}

1815

1816

/* Sleep checking until interface is running.

1817

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

1818

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

1819

if(interface_is_running(interface)){

1820

break;

1821

}

1822

struct timespec sleeptime = { .tv_nsec = 250000000 };

1823

ret = nanosleep(&sleeptime, NULL);

1824

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

1825

perror_plus("nanosleep");

1826

}

1827

}

1828

1829

errno = old_errno;

1830

return 0;

1831

}

1832

1833

__attribute__((nonnull, warn_unused_result))

1834

error_t take_down_interface(const char *const interface){

1835

error_t old_errno = errno;

1836

struct ifreq network;

1837

unsigned int if_index = if_nametoindex(interface);

1838

if(if_index == 0){

1839

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

1840

errno = old_errno;

1841

return ENXIO;

1842

}

1843

if(interface_is_up(interface)){

1844

error_t ret_errno = 0, ioctl_errno = 0;

1845

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

1846

ret_errno = errno;

1847

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

1848

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

1849

errno = old_errno;

1850

return ret_errno;

1851

}

1852

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

1853

1854

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

1855

if(sd == -1){

1856

ret_errno = errno;

1857

perror_plus("socket");

1858

errno = old_errno;

1859

return ret_errno;

1860

}

1861

1862

if(debug){

1863

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

1864

interface);

1865

}

1866

1867

/* Raise privileges */

1868

ret_errno = raise_privileges();

1869

if(ret_errno != 0){

1870

perror_plus("Failed to raise privileges");

1871

}

1872

1873

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

1874

ioctl_errno = errno;

1875

1876

/* If raise_privileges() succeeded above */

1877

if(ret_errno == 0){

1878

/* Lower privileges */

1879

ret_errno = lower_privileges();

1880

if(ret_errno != 0){

1881

errno = ret_errno;

1882

perror_plus("Failed to lower privileges");

1883

}

1884

}

1885

1886

/* Close the socket */

1887

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

1888

if(ret == -1){

1889

perror_plus("close");

1890

}

1891

1892

if(ret_setflags == -1){

1893

errno = ioctl_errno;

1894

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1895

errno = old_errno;

1896

return ioctl_errno;

1897

}

1898

} else if(debug){

1899

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

1900

interface);

1901

}

1902

1903

errno = old_errno;

1904

return 0;

1021

1905

}

1022

1906

1023

1907

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

1908

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

1909

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

1910

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

1911

.interfaces = NULL, .interfaces_size = 0 };

1024

1912

AvahiSServiceBrowser *sb = NULL;

1025

int error;

1913

error_t ret_errno;

1026

1914

int ret;

1027

1915

intmax_t tmpmax;

1028

1916

char *tmp;

1029

1917

int exitcode = EXIT_SUCCESS;

1030

const char *interface = "eth0";

1031

struct ifreq network;

1032

int sd = -1;

1033

bool take_down_interface = false;

1034

uid_t uid;

1035

gid_t gid;

1036

char *connect_to = NULL;

1037

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

1038

bool tempdir_created = false;

1918

char *interfaces_to_take_down = NULL;

1919

size_t interfaces_to_take_down_size = 0;

1920

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

1921

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

1922

char *tempdir = NULL;

1039

1923

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1040

1924

const char *seckey = PATHDIR "/" SECKEY;

1041

1925

const char *pubkey = PATHDIR "/" PUBKEY;

1926

char *interfaces_hooks = NULL;

1042

1927

1043

1928

bool gnutls_initialized = false;

1044

1929

bool gpgme_initialized = false;

1045

1930

float delay = 2.5f;

1931

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

1932

retrying the same server again */

1046

1933

1047

1934

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1048

1935

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1054

1941

errno = 0;

1055

1942

ret = setgid(gid);

1056

1943

if(ret == -1){

1057

perror("setgid");

1944

perror_plus("setgid");

1058

1945

}

1059

1946

1060

1947

/* Lower user privileges (temporarily) */

1061

1948

errno = 0;

1062

1949

ret = seteuid(uid);

1063

1950

if(ret == -1){

1064

perror("seteuid");

1951

perror_plus("seteuid");

1065

1952

}

1066

1953

1067

1954

if(quit_now){

1102

1989

.arg = "SECONDS",

1103

1990

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

1104

1991

.group = 2 },

1992

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

1993

.arg = "SECONDS",

1994

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

1995

.group = 2 },

1996

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

1997

.arg = "DIR",

1998

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

1999

.group = 2 },

1105

2000

/*

1106

2001

* These reproduce what we would get without ARGP_NO_HELP

1107

2002

*/

1125

2020

connect_to = arg;

1126

2021

break;

1127

2022

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

1128

interface = arg;

2023

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

2024

arg, (int)',');

2025

if(ret_errno != 0){

2026

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

2027

}

1129

2028

break;

1130

2029

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

1131

2030

seckey = arg;

1151

2050

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

1152

2051

argp_error(state, "Bad delay");

1153

2052

}

2053

case 132: /* --retry */

2054

errno = 0;

2055

retry_interval = strtod(arg, &tmp);

2056

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

2057

or (retry_interval * 1000) > INT_MAX

2058

or retry_interval < 0){

2059

argp_error(state, "Bad retry interval");

2060

}

2061

break;

2062

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

2063

hookdir = arg;

1154

2064

break;

1155

2065

/*

1156

2066

* These reproduce what we would get without ARGP_NO_HELP

1163

2073

argp_state_help(state, state->out_stream,

1164

2074

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1165

2075

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

1166

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

2076

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

1167

2077

exit(argp_err_exit_status);

1168

2078

break;

1169

2079

default:

1184

2094

case ENOMEM:

1185

2095

default:

1186

2096

errno = ret;

1187

perror("argp_parse");

2097

perror_plus("argp_parse");

1188

2098

exitcode = EX_OSERR;

1189

2099

goto end;

1190

2100

case EINVAL:

1192

2102

goto end;

1193

2103

}

1194

2104

}

2105

2106

{

2107

/* Work around Debian bug #633582:

2108

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

2109

2110

/* Re-raise privileges */

2111

ret_errno = raise_privileges();

2112

if(ret_errno != 0){

2113

errno = ret_errno;

2114

perror_plus("Failed to raise privileges");

2115

} else {

2116

struct stat st;

2117

2118

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

2119

int seckey_fd = open(seckey, O_RDONLY);

2120

if(seckey_fd == -1){

2121

perror_plus("open");

2122

} else {

2123

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

2124

if(ret == -1){

2125

perror_plus("fstat");

2126

} else {

2127

if(S_ISREG(st.st_mode)

2128

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

2129

ret = fchown(seckey_fd, uid, gid);

2130

if(ret == -1){

2131

perror_plus("fchown");

2132

}

2133

}

2134

}

2135

TEMP_FAILURE_RETRY(close(seckey_fd));

2136

}

2137

}

2138

2139

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

2140

int pubkey_fd = open(pubkey, O_RDONLY);

2141

if(pubkey_fd == -1){

2142

perror_plus("open");

2143

} else {

2144

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

2145

if(ret == -1){

2146

perror_plus("fstat");

2147

} else {

2148

if(S_ISREG(st.st_mode)

2149

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

2150

ret = fchown(pubkey_fd, uid, gid);

2151

if(ret == -1){

2152

perror_plus("fchown");

2153

}

2154

}

2155

}

2156

TEMP_FAILURE_RETRY(close(pubkey_fd));

2157

}

2158

}

2159

2160

/* Lower privileges */

2161

ret_errno = lower_privileges();

2162

if(ret_errno != 0){

2163

errno = ret_errno;

2164

perror_plus("Failed to lower privileges");

2165

}

2166

}

2167

}

2168

2169

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

2170

{

2171

char *interface = NULL;

2172

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

2173

interface))){

2174

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

2175

and if_nametoindex(interface) == 0){

2176

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

2177

fprintf_plus(stderr, "Not using nonexisting interface"

2178

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

2179

}

2180

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

2181

interface = NULL;

2182

}

2183

}

2184

}

2185

2186

/* Run network hooks */

2187

{

2188

if(mc.interfaces != NULL){

2189

interfaces_hooks = malloc(mc.interfaces_size);

2190

if(interfaces_hooks == NULL){

2191

perror_plus("malloc");

2192

goto end;

2193

}

2194

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

2195

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

2196

}

2197

run_network_hooks("start", interfaces_hooks != NULL ?

2198

interfaces_hooks : "", delay);

2199

}

1195

2200

1196

2201

if(not debug){

1197

2202

avahi_set_log_function(empty_log);

1201

2206

from the signal handler */

1202

2207

/* Initialize the pseudo-RNG for Avahi */

1203

2208

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

1204

mc.simple_poll = avahi_simple_poll_new();

1205

if(mc.simple_poll == NULL){

1206

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

2209

simple_poll = avahi_simple_poll_new();

2210

if(simple_poll == NULL){

2211

fprintf_plus(stderr,

2212

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

1207

2213

exitcode = EX_UNAVAILABLE;

1208

2214

goto end;

1209

2215

}

1211

2217

sigemptyset(&sigterm_action.sa_mask);

1212

2218

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

1213

2219

if(ret == -1){

1214

perror("sigaddset");

2220

perror_plus("sigaddset");

1215

2221

exitcode = EX_OSERR;

1216

2222

goto end;

1217

2223

}

1218

2224

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

1219

2225

if(ret == -1){

1220

perror("sigaddset");

2226

perror_plus("sigaddset");

1221

2227

exitcode = EX_OSERR;

1222

2228

goto end;

1223

2229

}

1224

2230

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

1225

2231

if(ret == -1){

1226

perror("sigaddset");

2232

perror_plus("sigaddset");

1227

2233

exitcode = EX_OSERR;

1228

2234

goto end;

1229

2235

}

1233

2239

*/

1234

2240

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

1235

2241

if(ret == -1){

1236

perror("sigaction");

2242

perror_plus("sigaction");

1237

2243

return EX_OSERR;

1238

2244

}

1239

2245

if(old_sigterm_action.sa_handler != SIG_IGN){

1240

2246

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

1241

2247

if(ret == -1){

1242

perror("sigaction");

2248

perror_plus("sigaction");

1243

2249

exitcode = EX_OSERR;

1244

2250

goto end;

1245

2251

}

1246

2252

}

1247

2253

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

1248

2254

if(ret == -1){

1249

perror("sigaction");

2255

perror_plus("sigaction");

1250

2256

return EX_OSERR;

1251

2257

}

1252

2258

if(old_sigterm_action.sa_handler != SIG_IGN){

1253

2259

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

1254

2260

if(ret == -1){

1255

perror("sigaction");

2261

perror_plus("sigaction");

1256

2262

exitcode = EX_OSERR;

1257

2263

goto end;

1258

2264

}

1259

2265

}

1260

2266

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

1261

2267

if(ret == -1){

1262

perror("sigaction");

2268

perror_plus("sigaction");

1263

2269

return EX_OSERR;

1264

2270

}

1265

2271

if(old_sigterm_action.sa_handler != SIG_IGN){

1266

2272

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

1267

2273

if(ret == -1){

1268

perror("sigaction");

1269

exitcode = EX_OSERR;

1270

goto end;

1271

}

1272

}

1273

1274

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

1275

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

1276

if_index = (AvahiIfIndex) if_nametoindex(interface);

1277

if(if_index == 0){

1278

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

1279

exitcode = EX_UNAVAILABLE;

1280

goto end;

1281

}

1282

1283

if(quit_now){

1284

goto end;

1285

}

1286

1287

/* Re-raise priviliges */

1288

errno = 0;

1289

ret = seteuid(0);

1290

if(ret == -1){

1291

perror("seteuid");

1292

}

1293

1294

#ifdef __linux__

1295

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1296

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

1297

ret = klogctl(8, NULL, 5);

1298

bool restore_loglevel = true;

1299

if(ret == -1){

1300

restore_loglevel = false;

1301

perror("klogctl");

1302

}

1303

#endif /* __linux__ */

1304

1305

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1306

if(sd < 0){

1307

perror("socket");

1308

exitcode = EX_OSERR;

1309

#ifdef __linux__

1310

if(restore_loglevel){

1311

ret = klogctl(7, NULL, 0);

1312

if(ret == -1){

1313

perror("klogctl");

1314

}

1315

}

1316

#endif /* __linux__ */

1317

/* Lower privileges */

1318

errno = 0;

1319

ret = seteuid(uid);

1320

if(ret == -1){

1321

perror("seteuid");

1322

}

1323

goto end;

1324

}

1325

strcpy(network.ifr_name, interface);

1326

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

1327

if(ret == -1){

1328

perror("ioctl SIOCGIFFLAGS");

1329

#ifdef __linux__

1330

if(restore_loglevel){

1331

ret = klogctl(7, NULL, 0);

1332

if(ret == -1){

1333

perror("klogctl");

1334

}

1335

}

1336

#endif /* __linux__ */

1337

exitcode = EX_OSERR;

1338

/* Lower privileges */

1339

errno = 0;

1340

ret = seteuid(uid);

1341

if(ret == -1){

1342

perror("seteuid");

1343

}

1344

goto end;

1345

}

1346

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

1347

network.ifr_flags |= IFF_UP;

1348

take_down_interface = true;

1349

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

1350

if(ret == -1){

1351

take_down_interface = false;

1352

perror("ioctl SIOCSIFFLAGS");

1353

exitcode = EX_OSERR;

1354

#ifdef __linux__

1355

if(restore_loglevel){

1356

ret = klogctl(7, NULL, 0);

1357

if(ret == -1){

1358

perror("klogctl");

2274

perror_plus("sigaction");

2275

exitcode = EX_OSERR;

2276

goto end;

2277

}

2278

}

2279

2280

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

2281

if(mc.interfaces == NULL){

2282

struct dirent **direntries;

2283

/* Look for any good interfaces */

2284

ret = scandir(sys_class_net, &direntries, good_interface,

2285

alphasort);

2286

if(ret >= 1){

2287

/* Add all found interfaces to interfaces list */

2288

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

2289

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

2290

direntries[i]->d_name);

2291

if(ret_errno != 0){

2292

errno = ret_errno;

2293

perror_plus("argz_add");

2294

continue;

2295

}

2296

if(debug){

2297

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

2298

direntries[i]->d_name);

2299

}

2300

}

2301

free(direntries);

2302

} else {

2303

free(direntries);

2304

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

2305

exitcode = EXIT_FAILURE;

2306

goto end;

2307

}

2308

}

2309

2310

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

2311

{

2312

char *interface = NULL;

2313

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

2314

interface))){

2315

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

2316

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

2317

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

2318

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

2319

interface);

2320

interface = NULL;

2321

while((interface = argz_next(mc.interfaces,

2322

mc.interfaces_size, interface))){

2323

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

2324

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

2325

interface);

2326

interface = NULL;

1359

2327

}

1360

2328

}

1361

#endif /* __linux__ */

1362

/* Lower privileges */

1363

errno = 0;

1364

ret = seteuid(uid);

1365

if(ret == -1){

1366

perror("seteuid");

1367

}

1368

goto end;

1369

}

1370

}

1371

/* sleep checking until interface is running */

1372

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

1373

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

1374

if(ret == -1){

1375

perror("ioctl SIOCGIFFLAGS");

1376

} else if(network.ifr_flags & IFF_RUNNING){

1377

2329

break;

1378

2330

}

1379

struct timespec sleeptime = { .tv_nsec = 250000000 };

1380

ret = nanosleep(&sleeptime, NULL);

1381

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

1382

perror("nanosleep");

1383

}

1384

}

1385

if(not take_down_interface){

1386

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

1387

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

1388

if(ret == -1){

1389

perror("close");

1390

}

1391

}

1392

#ifdef __linux__

1393

if(restore_loglevel){

1394

/* Restores kernel loglevel to default */

1395

ret = klogctl(7, NULL, 0);

1396

if(ret == -1){

1397

perror("klogctl");

1398

}

1399

}

1400

#endif /* __linux__ */

1401

/* Lower privileges */

1402

errno = 0;

1403

if(take_down_interface){

1404

/* Lower privileges */

1405

ret = seteuid(uid);

1406

if(ret == -1){

1407

perror("seteuid");

1408

}

1409

} else {

1410

/* Lower privileges permanently */

1411

ret = setuid(uid);

1412

if(ret == -1){

1413

perror("setuid");

1414

}

1415

}

2331

bool interface_was_up = interface_is_up(interface);

2332

errno = bring_up_interface(interface, delay);

2333

if(not interface_was_up){

2334

if(errno != 0){

2335

perror_plus("Failed to bring up interface");

2336

} else {

2337

errno = argz_add(&interfaces_to_take_down,

2338

&interfaces_to_take_down_size,

2339

interface);

2340

if(errno != 0){

2341

perror_plus("argz_add");

2342

}

2343

}

2344

}

2345

}

2346

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

2347

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

2348

}

2349

}

2350

2351

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

2352

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

2353

if(debug){

2354

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

2355

mc.interfaces);

2356

}

2357

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

1416

2358

}

1417

2359

1418

2360

if(quit_now){

1419

2361

goto end;

1420

2362

}

1421

2363

1422

ret = init_gnutls_global(pubkey, seckey);

2364

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

1423

2365

if(ret == -1){

1424

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

2366

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

1425

2367

exitcode = EX_UNAVAILABLE;

1426

2368

goto end;

1427

2369

} else {

1432

2374

goto end;

1433

2375

}

1434

2376

1435

tempdir_created = true;

1436

if(mkdtemp(tempdir) == NULL){

1437

tempdir_created = false;

1438

perror("mkdtemp");

2377

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

2378

tempdir = mkdtemp(run_tempdir);

2379

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

2380

if(debug){

2381

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

2382

run_tempdir, old_tempdir);

2383

}

2384

tempdir = mkdtemp(old_tempdir);

2385

}

2386

if(tempdir == NULL){

2387

perror_plus("mkdtemp");

1439

2388

goto end;

1440

2389

}

1441

2390

1443

2392

goto end;

1444

2393

}

1445

2394

1446

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

1447

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

2395

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

2396

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

1448

2397

exitcode = EX_UNAVAILABLE;

1449

2398

goto end;

1450

2399

} else {

1459

2408

/* Connect directly, do not use Zeroconf */

1460

2409

/* (Mainly meant for debugging) */

1461

2410

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

2411

1462

2412

if(address == NULL){

1463

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

2413

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

1464

2414

exitcode = EX_USAGE;

1465

2415

goto end;

1466

2416

}

1469

2419

goto end;

1470

2420

}

1471

2421

1472

uint16_t port;

2422

in_port_t port;

1473

2423

errno = 0;

1474

2424

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

1475

2425

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

1476

or tmpmax != (uint16_t)tmpmax){

1477

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

2426

or tmpmax != (in_port_t)tmpmax){

2427

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

1478

2428

exitcode = EX_USAGE;

1479

2429

goto end;

1480

2430

}

1481

2431

1482

2432

if(quit_now){

1483

2433

goto end;

1484

2434

}

1485

2435

1486

port = (uint16_t)tmpmax;

2436

port = (in_port_t)tmpmax;

1487

2437

*address = '\0';

1488

address = connect_to;

1489

2438

/* Colon in address indicates IPv6 */

1490

2439

int af;

1491

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

2440

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

1492

2441

af = AF_INET6;

2442

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

2443

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

2444

{

2445

connect_to++;

2446

address[-1] = '\0';

2447

}

1493

2448

} else {

1494

2449

af = AF_INET;

1495

2450

}

2451

address = connect_to;

1496

2452

1497

2453

if(quit_now){

1498

2454

goto end;

1499

2455

}

1500

2456

1501

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

1502

if(ret < 0){

1503

switch(errno){

1504

case ENETUNREACH:

1505

case EHOSTDOWN:

1506

case EHOSTUNREACH:

1507

exitcode = EX_NOHOST;

1508

break;

1509

case EINVAL:

1510

exitcode = EX_USAGE;

1511

break;

1512

case EIO:

1513

exitcode = EX_IOERR;

1514

break;

1515

case EPROTO:

1516

exitcode = EX_PROTOCOL;

1517

break;

1518

default:

1519

exitcode = EX_OSERR;

1520

break;

1521

}

1522

} else {

2457

while(not quit_now){

2458

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

2459

&mc);

2460

if(quit_now or ret == 0){

2461

break;

2462

}

2463

if(debug){

2464

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

2465

(int)retry_interval);

2466

}

2467

sleep((unsigned int)retry_interval);

2468

}

2469

2470

if(not quit_now){

1523

2471

exitcode = EXIT_SUCCESS;

1524

2472

}

2473

1525

2474

goto end;

1526

2475

}

1527

2476

1539

2488

config.publish_domain = 0;

1540

2489

1541

2490

/* Allocate a new server */

1542

mc.server = avahi_server_new(avahi_simple_poll_get

1543

(mc.simple_poll), &config, NULL,

1544

NULL, &error);

2491

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2492

&config, NULL, NULL, &ret_errno);

1545

2493

1546

2494

/* Free the Avahi configuration data */

1547

2495

avahi_server_config_free(&config);

1549

2497

1550

2498

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

1551

2499

if(mc.server == NULL){

1552

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

1553

avahi_strerror(error));

2500

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

2501

avahi_strerror(ret_errno));

1554

2502

exitcode = EX_UNAVAILABLE;

1555

2503

goto end;

1556

2504

}

1562

2510

/* Create the Avahi service browser */

1563

2511

sb = avahi_s_service_browser_new(mc.server, if_index,

1564

2512

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1565

NULL, 0, browse_callback, NULL);

2513

NULL, 0, browse_callback,

2514

(void *)&mc);

1566

2515

if(sb == NULL){

1567

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

1568

avahi_strerror(avahi_server_errno(mc.server)));

2516

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

2517

avahi_strerror(avahi_server_errno(mc.server)));

1569

2518

exitcode = EX_UNAVAILABLE;

1570

2519

goto end;

1571

2520

}

1577

2526

/* Run the main loop */

1578

2527

1579

2528

if(debug){

1580

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

2529

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

1581

2530

}

1582

2531

1583

avahi_simple_poll_loop(mc.simple_poll);

2532

ret = avahi_loop_with_timeout(simple_poll,

2533

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

2534

if(debug){

2535

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

2536

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

2537

}

1584

2538

1585

2539

end:

1586

2540

1587

2541

if(debug){

1588

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

2542

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

1589

2543

}

1590

2544

1591

2545

/* Cleanup things */

2546

free(mc.interfaces);

2547

1592

2548

if(sb != NULL)

1593

2549

avahi_s_service_browser_free(sb);

1594

2550

1595

2551

if(mc.server != NULL)

1596

2552

avahi_server_free(mc.server);

1597

2553

1598

if(mc.simple_poll != NULL)

1599

avahi_simple_poll_free(mc.simple_poll);

2554

if(simple_poll != NULL)

2555

avahi_simple_poll_free(simple_poll);

1600

2556

1601

2557

if(gnutls_initialized){

1602

2558

gnutls_certificate_free_credentials(mc.cred);

1608

2564

gpgme_release(mc.ctx);

1609

2565

}

1610

2566

1611

/* Take down the network interface */

1612

if(take_down_interface){

1613

/* Re-raise priviliges */

1614

errno = 0;

1615

ret = seteuid(0);

1616

if(ret == -1){

1617

perror("seteuid");

1618

}

1619

if(geteuid() == 0){

1620

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

1621

if(ret == -1){

1622

perror("ioctl SIOCGIFFLAGS");

1623

} else if(network.ifr_flags & IFF_UP) {

1624

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

1625

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

1626

if(ret == -1){

1627

perror("ioctl SIOCSIFFLAGS");

1628

}

1629

}

1630

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

1631

if(ret == -1){

1632

perror("close");

1633

}

1634

/* Lower privileges permanently */

1635

errno = 0;

1636

ret = setuid(uid);

1637

if(ret == -1){

1638

perror("setuid");

1639

}

2567

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

2568

has seen */

2569

if(mc.current_server != NULL){

2570

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

2571

while(mc.current_server != NULL){

2572

server *next = mc.current_server->next;

2573

free(mc.current_server);

2574

mc.current_server = next;

1640

2575

}

1641

2576

}

1642

2577

1643

/* Removes the temp directory used by GPGME */

1644

if(tempdir_created){

1645

DIR *d;

1646

struct dirent *direntry;

1647

d = opendir(tempdir);

1648

if(d == NULL){

1649

if(errno != ENOENT){

1650

perror("opendir");

1651

}

2578

/* Re-raise privileges */

2579

{

2580

ret_errno = raise_privileges();

2581

if(ret_errno != 0){

2582

perror_plus("Failed to raise privileges");

1652

2583

} else {

1653

while(true){

1654

direntry = readdir(d);

1655

if(direntry == NULL){

1656

break;

1657

}

1658

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

1659

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

1660

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

1661

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

1662

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

1663

continue;

1664

}

2584

2585

/* Run network hooks */

2586

run_network_hooks("stop", interfaces_hooks != NULL ?

2587

interfaces_hooks : "", delay);

2588

2589

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

2590

{

2591

char *interface = NULL;

2592

while((interface=argz_next(interfaces_to_take_down,

2593

interfaces_to_take_down_size,

2594

interface))){

2595

ret_errno = take_down_interface(interface);

2596

if(ret_errno != 0){

2597

errno = ret_errno;

2598

perror_plus("Failed to take down interface");

2599

}

2600

}

2601

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

2602

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

2603

" down\n");

2604

}

2605

}

2606

}

2607

2608

ret_errno = lower_privileges_permanently();

2609

if(ret_errno != 0){

2610

perror_plus("Failed to lower privileges permanently");

2611

}

2612

}

2613

2614

free(interfaces_to_take_down);

2615

free(interfaces_hooks);

2616

2617

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

2618

if(tempdir != NULL){

2619

struct dirent **direntries = NULL;

2620

struct dirent *direntry = NULL;

2621

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

2622

alphasort);

2623

if(numentries > 0){

2624

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

2625

direntry = direntries[i];

1665

2626

char *fullname = NULL;

1666

2627

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

1667

2628

direntry->d_name);

1668

2629

if(ret < 0){

1669

perror("asprintf");

2630

perror_plus("asprintf");

1670

2631

continue;

1671

2632

}

1672

2633

ret = remove(fullname);

1673

2634

if(ret == -1){

1674

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

1675

strerror(errno));

2635

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

2636

strerror(errno));

1676

2637

}

1677

2638

free(fullname);

1678

2639

}

1679

closedir(d);

2640

}

2641

2642

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

2643

free(direntries);

2644

if(numentries == -1){

2645

perror_plus("scandir");

1680

2646

}

1681

2647

ret = rmdir(tempdir);

1682

2648

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

1683

perror("rmdir");

2649

perror_plus("rmdir");

1684

2650

}

1685

2651

}

1686

2652

1691

2657

&old_sigterm_action,

1692

2658

NULL));

1693

2659

if(ret == -1){

1694

perror("sigaction");

2660

perror_plus("sigaction");

1695

2661

}

1696

2662

do {

1697

2663

ret = raise(signal_received);

1698

2664

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

1699

2665

if(ret != 0){

1700

perror("raise");

2666

perror_plus("raise");

1701

2667

abort();

1702

2668

}

1703

2669

TEMP_FAILURE_RETRY(pause());