/mandos/release : revision 237.7.252

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

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*

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* Everything else is

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*

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

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

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* along with this program. If not, see

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

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*

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

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

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*/

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

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#ifndef _LARGEFILE_SOURCE

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#define _LARGEFILE_SOURCE

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#endif

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#endif /* not _LARGEFILE_SOURCE */

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#ifndef _FILE_OFFSET_BITS

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#define _FILE_OFFSET_BITS 64

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#endif

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#endif /* not _FILE_OFFSET_BITS */

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

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

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stdout, ferror(), remove() */

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

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stdout, ferror() */

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

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

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

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strtof(), abort() */

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sockaddr_in6, PF_INET6,

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SOCK_STREAM, uid_t, gid_t, open(),

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opendir(), DIR */

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

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

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

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inet_pton(), connect() */

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

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inet_pton(), connect(),

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getnameinfo() */

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

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

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*/

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#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,

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strtoimax() */

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

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

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

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

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program_invocation_short_name */

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

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

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SIOCSIFFLAGS, if_indextoname(),

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if_nametoindex(), IF_NAMESIZE */

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*/

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

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

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setgid(), pause() */

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

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

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unlinkat() */

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

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

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

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argp_state, struct argp,

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raise() */

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

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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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

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WEXITSTATUS(), WTERMSIG() */

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

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

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argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

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argz_count() */

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

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EAI_SYSTEM, gai_strerror() */

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#ifdef __linux__

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100

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

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118

init_gnutls_session(),

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119

GNUTLS_* */

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120

#include <gnutls/openpgp.h>

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* GPGME */

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125

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

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133

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

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134

#define SECKEY "seckey.txt"

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135

#define PUBKEY "pubkey.txt"

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

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137

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bool debug = false;

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139

static const char mandos_protocol_version[] = "1";

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140

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

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

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

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

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char *connect_to = NULL;

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const char *hookdir = HOOKDIR;

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int hookdir_fd = -1;

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uid_t uid = 65534;

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gid_t gid = 65534;

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149

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

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typedef struct server{

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const char *ip;

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in_port_t port;

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AvahiIfIndex if_index;

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int af;

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struct timespec last_seen;

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struct server *next;

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struct server *prev;

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} server;

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

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161

typedef struct {

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AvahiSimplePoll *simple_poll;

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162

AvahiServer *server;

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163

gnutls_certificate_credentials_t cred;

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164

unsigned int dh_bits;

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165

gnutls_dh_params_t dh_params;

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166

const char *priority;

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167

gpgme_ctx_t ctx;

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server *current_server;

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char *interfaces;

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size_t interfaces_size;

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171

} mandos_context;

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172

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

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

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.dh_bits = 1024, .priority = "SECURE256"

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

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/* global so signal handler can reach it*/

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AvahiSimplePoll *simple_poll;

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175

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sig_atomic_t quit_now = 0;

148

177

int signal_received = 0;

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178

179

/* Function to use when printing errors */

180

void perror_plus(const char *print_text){

181

int e = errno;

182

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

183

program_invocation_short_name);

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errno = e;

185

perror(print_text);

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}

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188

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

189

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

190

va_list ap;

191

va_start (ap, format);

192

193

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

194

program_invocation_short_name));

195

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

196

}

197

150

198

/*

151

199

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

152

200

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

153

201

* "buffer_length" is how much is already used.

154

202

*/

203

__attribute__((nonnull, warn_unused_result))

155

204

size_t incbuffer(char **buffer, size_t buffer_length,

156

size_t buffer_capacity){

205

size_t buffer_capacity){

157

206

if(buffer_length + BUFFER_SIZE > buffer_capacity){

158

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

159

if(buffer == NULL){

207

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

208

if(new_buf == NULL){

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int old_errno = errno;

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free(*buffer);

211

errno = old_errno;

212

*buffer = NULL;

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213

return 0;

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214

}

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*buffer = new_buf;

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buffer_capacity += BUFFER_SIZE;

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217

}

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return buffer_capacity;

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219

}

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

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__attribute__((nonnull, warn_unused_result))

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

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int af, server **current_server){

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int ret;

226

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

227

if(new_server == NULL){

228

perror_plus("malloc");

229

return false;

230

}

231

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

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.port = port,

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.if_index = if_index,

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.af = af };

235

if(new_server->ip == NULL){

236

perror_plus("strdup");

237

return false;

238

}

239

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

240

if(ret == -1){

241

perror_plus("clock_gettime");

242

return false;

243

}

244

/* Special case of first server */

245

if(*current_server == NULL){

246

new_server->next = new_server;

247

new_server->prev = new_server;

248

*current_server = new_server;

249

} else {

250

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

251

new_server->next = *current_server;

252

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

253

new_server->prev->next = new_server;

254

(*current_server)->prev = new_server;

255

}

256

return true;

257

}

258

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/*

168

260

* Initialize GPGME.

169

261

*/

170

static bool init_gpgme(const char *seckey,

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const char *pubkey, const char *tempdir){

262

__attribute__((nonnull, warn_unused_result))

263

static bool init_gpgme(const char * const seckey,

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const char * const pubkey,

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const char * const tempdir,

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mandos_context *mc){

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267

gpgme_error_t rc;

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gpgme_engine_info_t engine_info;

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269

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/*

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

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272

*/

179

bool import_key(const char *filename){

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bool import_key(const char * const filename){

180

274

int ret;

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int fd;

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gpgme_data_t pgp_data;

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

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279

if(fd == -1){

186

perror("open");

280

perror_plus("open");

187

281

return false;

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282

}

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

191

285

if(rc != GPG_ERR_NO_ERROR){

192

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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288

return false;

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289

}

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rc = gpgme_op_import(mc.ctx, pgp_data);

291

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

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292

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));

293

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;

202

296

}

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297

204

298

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

205

299

if(ret == -1){

206

perror("close");

300

perror_plus("close");

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301

}

208

302

gpgme_data_release(pgp_data);

209

303

return true;

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304

}

211

305

212

306

if(debug){

213

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

307

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

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}

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309

216

310

/* Init GPGME */

217

311

gpgme_check_version(NULL);

218

312

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

219

313

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));

314

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

315

gpgme_strsource(rc), gpgme_strerror(rc));

222

316

return false;

223

317

}

224

318

225

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

319

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

226

320

rc = gpgme_get_engine_info(&engine_info);

227

321

if(rc != GPG_ERR_NO_ERROR){

228

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

229

gpgme_strsource(rc), gpgme_strerror(rc));

322

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

323

gpgme_strsource(rc), gpgme_strerror(rc));

230

324

return false;

231

325

}

232

326

while(engine_info != NULL){

238

332

engine_info = engine_info->next;

239

333

}

240

334

if(engine_info == NULL){

241

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

335

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

336

tempdir);

242

337

return false;

243

338

}

244

339

245

340

/* Create new GPGME "context" */

246

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

341

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

247

342

if(rc != GPG_ERR_NO_ERROR){

248

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

249

gpgme_strsource(rc), gpgme_strerror(rc));

343

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

344

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

345

gpgme_strerror(rc));

250

346

return false;

251

347

}

252

348

261

357

* Decrypt OpenPGP data.

262

358

* Returns -1 on error

263

359

*/

360

__attribute__((nonnull, warn_unused_result))

264

361

static ssize_t pgp_packet_decrypt(const char *cryptotext,

265

362

size_t crypto_size,

266

char **plaintext){

363

char **plaintext,

364

mandos_context *mc){

267

365

gpgme_data_t dh_crypto, dh_plain;

268

366

gpgme_error_t rc;

269

367

ssize_t ret;

271

369

ssize_t plaintext_length = 0;

272

370

273

371

if(debug){

274

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

372

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

275

373

}

276

374

277

375

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

278

376

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

279

377

0);

280

378

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));

379

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

380

gpgme_strsource(rc), gpgme_strerror(rc));

283

381

return -1;

284

382

}

285

383

286

384

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

287

385

rc = gpgme_data_new(&dh_plain);

288

386

if(rc != GPG_ERR_NO_ERROR){

289

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

290

gpgme_strsource(rc), gpgme_strerror(rc));

387

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

388

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

389

gpgme_strsource(rc), gpgme_strerror(rc));

291

390

gpgme_data_release(dh_crypto);

292

391

return -1;

293

392

}

294

393

295

394

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

296

395

data buffer */

297

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

396

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

298

397

if(rc != GPG_ERR_NO_ERROR){

299

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

300

gpgme_strsource(rc), gpgme_strerror(rc));

398

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

399

gpgme_strsource(rc), gpgme_strerror(rc));

301

400

plaintext_length = -1;

302

401

if(debug){

303

402

gpgme_decrypt_result_t result;

304

result = gpgme_op_decrypt_result(mc.ctx);

403

result = gpgme_op_decrypt_result(mc->ctx);

305

404

if(result == NULL){

306

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

405

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

307

406

} 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);

407

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

408

result->unsupported_algorithm);

409

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

410

result->wrong_key_usage);

312

411

if(result->file_name != NULL){

313

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

412

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

314

413

}

315

414

gpgme_recipient_t recipient;

316

415

recipient = result->recipients;

317

416

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");

417

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

418

gpgme_pubkey_algo_name

419

(recipient->pubkey_algo));

420

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

421

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

422

recipient->status == GPG_ERR_NO_SECKEY

423

? "No" : "Yes");

324

424

recipient = recipient->next;

325

425

}

326

426

}

329

429

}

330

430

331

431

if(debug){

332

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

432

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

333

433

}

334

434

335

435

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

336

436

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

337

perror("gpgme_data_seek");

437

perror_plus("gpgme_data_seek");

338

438

plaintext_length = -1;

339

439

goto decrypt_end;

340

440

}

342

442

*plaintext = NULL;

343

443

while(true){

344

444

plaintext_capacity = incbuffer(plaintext,

345

(size_t)plaintext_length,

346

plaintext_capacity);

445

(size_t)plaintext_length,

446

plaintext_capacity);

347

447

if(plaintext_capacity == 0){

348

perror("incbuffer");

349

plaintext_length = -1;

350

goto decrypt_end;

448

perror_plus("incbuffer");

449

plaintext_length = -1;

450

goto decrypt_end;

351

451

}

352

452

353

453

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

358

458

break;

359

459

}

360

460

if(ret < 0){

361

perror("gpgme_data_read");

461

perror_plus("gpgme_data_read");

362

462

plaintext_length = -1;

363

463

goto decrypt_end;

364

464

}

366

466

}

367

467

368

468

if(debug){

369

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

469

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

370

470

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

371

471

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

372

472

}

383

483

return plaintext_length;

384

484

}

385

485

386

static const char * safer_gnutls_strerror(int value){

387

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

388

-Wunreachable-code */

486

__attribute__((warn_unused_result))

487

static const char *safer_gnutls_strerror(int value){

488

const char *ret = gnutls_strerror(value);

389

489

if(ret == NULL)

390

490

ret = "(unknown)";

391

491

return ret;

392

492

}

393

493

394

494

/* GnuTLS log function callback */

495

__attribute__((nonnull))

395

496

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

396

497

const char* string){

397

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

498

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

398

499

}

399

500

501

__attribute__((nonnull, warn_unused_result))

400

502

static int init_gnutls_global(const char *pubkeyfilename,

401

const char *seckeyfilename){

503

const char *seckeyfilename,

504

mandos_context *mc){

402

505

int ret;

403

506

404

507

if(debug){

405

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

508

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

406

509

}

407

510

408

511

ret = gnutls_global_init();

409

512

if(ret != GNUTLS_E_SUCCESS){

410

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

411

safer_gnutls_strerror(ret));

513

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

514

safer_gnutls_strerror(ret));

412

515

return -1;

413

516

}

414

517

421

524

}

422

525

423

526

/* OpenPGP credentials */

424

gnutls_certificate_allocate_credentials(&mc.cred);

527

ret = gnutls_certificate_allocate_credentials(&mc->cred);

425

528

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));

529

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

530

safer_gnutls_strerror(ret));

431

531

gnutls_global_deinit();

432

532

return -1;

433

533

}

434

534

435

535

if(debug){

436

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

437

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

438

seckeyfilename);

536

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

537

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

538

pubkeyfilename,

539

seckeyfilename);

439

540

}

440

541

441

542

ret = gnutls_certificate_set_openpgp_key_file

442

(mc.cred, pubkeyfilename, seckeyfilename,

543

(mc->cred, pubkeyfilename, seckeyfilename,

443

544

GNUTLS_OPENPGP_FMT_BASE64);

444

545

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));

546

fprintf_plus(stderr,

547

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

548

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

549

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

550

safer_gnutls_strerror(ret));

450

551

goto globalfail;

451

552

}

452

553

453

554

/* GnuTLS server initialization */

454

ret = gnutls_dh_params_init(&mc.dh_params);

555

ret = gnutls_dh_params_init(&mc->dh_params);

455

556

if(ret != GNUTLS_E_SUCCESS){

456

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

457

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

557

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

558

" initialization: %s\n",

559

safer_gnutls_strerror(ret));

458

560

goto globalfail;

459

561

}

460

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

562

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

461

563

if(ret != GNUTLS_E_SUCCESS){

462

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

463

safer_gnutls_strerror(ret));

564

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

565

safer_gnutls_strerror(ret));

464

566

goto globalfail;

465

567

}

466

568

467

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

569

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

468

570

469

571

return 0;

470

572

471

573

globalfail:

472

574

473

gnutls_certificate_free_credentials(mc.cred);

575

gnutls_certificate_free_credentials(mc->cred);

474

576

gnutls_global_deinit();

475

gnutls_dh_params_deinit(mc.dh_params);

577

gnutls_dh_params_deinit(mc->dh_params);

476

578

return -1;

477

579

}

478

580

479

static int init_gnutls_session(gnutls_session_t *session){

581

__attribute__((nonnull, warn_unused_result))

582

static int init_gnutls_session(gnutls_session_t *session,

583

mandos_context *mc){

480

584

int ret;

481

585

/* GnuTLS session creation */

482

586

do {

486

590

}

487

591

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

488

592

if(ret != GNUTLS_E_SUCCESS){

489

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

490

safer_gnutls_strerror(ret));

593

fprintf_plus(stderr,

594

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

595

safer_gnutls_strerror(ret));

491

596

}

492

597

493

598

{

494

599

const char *err;

495

600

do {

496

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

601

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

497

602

if(quit_now){

498

603

gnutls_deinit(*session);

499

604

return -1;

500

605

}

501

606

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

502

607

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));

608

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

609

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

610

safer_gnutls_strerror(ret));

506

611

gnutls_deinit(*session);

507

612

return -1;

508

613

}

510

615

511

616

do {

512

617

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

513

mc.cred);

618

mc->cred);

514

619

if(quit_now){

515

620

gnutls_deinit(*session);

516

621

return -1;

517

622

}

518

623

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

519

624

if(ret != GNUTLS_E_SUCCESS){

520

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

521

safer_gnutls_strerror(ret));

625

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

626

safer_gnutls_strerror(ret));

522

627

gnutls_deinit(*session);

523

628

return -1;

524

629

}

526

631

/* ignore client certificate if any. */

527

632

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

528

633

529

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

634

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

530

635

531

636

return 0;

532

637

}

536

641

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

537

642

538

643

/* Called when a Mandos server is found */

539

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

644

__attribute__((nonnull, warn_unused_result))

645

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

540

646

AvahiIfIndex if_index,

541

int af){

647

int af, mandos_context *mc){

542

648

int ret, tcp_sd = -1;

543

649

ssize_t sret;

544

union {

545

struct sockaddr_in in;

546

struct sockaddr_in6 in6;

547

} to;

650

struct sockaddr_storage to;

548

651

char *buffer = NULL;

549

652

char *decrypted_buffer = NULL;

550

653

size_t buffer_length = 0;

569

672

pf = PF_INET;

570

673

break;

571

674

default:

572

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

675

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

573

676

errno = EINVAL;

574

677

return -1;

575

678

}

576

679

577

ret = init_gnutls_session(&session);

680

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

681

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

682

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

683

bool match = false;

684

{

685

char *interface = NULL;

686

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

687

interface))){

688

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

689

match = true;

690

break;

691

}

692

}

693

}

694

if(not match){

695

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

696

connect to the server */

697

if(debug){

698

char interface[IF_NAMESIZE];

699

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

700

perror_plus("if_indextoname");

701

} else {

702

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

703

" \"%s\"\n",

704

if_indextoname((unsigned int)if_index,

705

interface));

706

}

707

}

708

return -1;

709

}

710

}

711

712

ret = init_gnutls_session(&session, mc);

578

713

if(ret != 0){

579

714

return -1;

580

715

}

581

716

582

717

if(debug){

583

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

584

"\n", ip, port);

718

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

719

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

585

720

}

586

721

587

722

tcp_sd = socket(pf, SOCK_STREAM, 0);

588

723

if(tcp_sd < 0){

589

724

int e = errno;

590

perror("socket");

725

perror_plus("socket");

591

726

errno = e;

592

727

goto mandos_end;

593

728

}

599

734

600

735

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

601

736

if(af == AF_INET6){

602

to.in6.sin6_family = (sa_family_t)af;

603

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

737

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

738

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

604

739

} else { /* IPv4 */

605

to.in.sin_family = (sa_family_t)af;

606

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

740

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

741

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

607

742

}

608

743

if(ret < 0 ){

609

744

int e = errno;

610

perror("inet_pton");

745

perror_plus("inet_pton");

611

746

errno = e;

612

747

goto mandos_end;

613

748

}

614

749

if(ret == 0){

615

750

int e = errno;

616

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

751

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

617

752

errno = e;

618

753

goto mandos_end;

619

754

}

620

755

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*/

756

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

757

if(IN6_IS_ADDR_LINKLOCAL

758

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

628

759

if(if_index == AVAHI_IF_UNSPEC){

629

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

630

" without a network interface\n");

760

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

761

" incomplete without a network interface\n");

631

762

errno = EINVAL;

632

763

goto mandos_end;

633

764

}

634

765

/* Set the network interface number as scope */

635

to.in6.sin6_scope_id = (uint32_t)if_index;

766

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

636

767

}

637

768

} else {

638

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

639

-Wconversion and

640

-Wunreachable-code */

769

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

641

770

}

642

771

643

772

if(quit_now){

649

778

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

650

779

char interface[IF_NAMESIZE];

651

780

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

652

perror("if_indextoname");

781

perror_plus("if_indextoname");

653

782

} else {

654

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

655

ip, interface, port);

783

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

784

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

656

785

}

657

786

} else {

658

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

659

port);

787

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

788

ip, (uintmax_t)port);

660

789

}

661

790

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

662

791

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

663

const char *pcret;

664

792

if(af == AF_INET6){

665

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

666

sizeof(addrstr));

793

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

794

sizeof(struct sockaddr_in6),

795

addrstr, sizeof(addrstr), NULL, 0,

796

NI_NUMERICHOST);

667

797

} else {

668

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

669

sizeof(addrstr));

798

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

799

sizeof(struct sockaddr_in),

800

addrstr, sizeof(addrstr), NULL, 0,

801

NI_NUMERICHOST);

670

802

}

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

}

803

if(ret == EAI_SYSTEM){

804

perror_plus("getnameinfo");

805

} else if(ret != 0) {

806

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

807

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

808

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

677

809

}

678

810

}

679

811

683

815

}

684

816

685

817

if(af == AF_INET6){

686

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

818

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

819

sizeof(struct sockaddr_in6));

687

820

} else {

688

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

821

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

822

sizeof(struct sockaddr_in));

689

823

}

690

824

if(ret < 0){

691

int e = errno;

692

perror("connect");

693

errno = e;

825

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

826

int e = errno;

827

perror_plus("connect");

828

errno = e;

829

}

694

830

goto mandos_end;

695

831

}

696

832

704

840

while(true){

705

841

size_t out_size = strlen(out);

706

842

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

707

out_size - written));

843

out_size - written));

708

844

if(ret == -1){

709

845

int e = errno;

710

perror("write");

846

perror_plus("write");

711

847

errno = e;

712

848

goto mandos_end;

713

849

}

730

866

}

731

867

732

868

if(debug){

733

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

869

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

734

870

}

735

871

736

872

if(quit_now){

738

874

goto mandos_end;

739

875

}

740

876

741

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

877

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

878

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

879

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

880

gnutls_transport_set_ptr(session,

881

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

742

882

743

883

if(quit_now){

744

884

errno = EINTR;

755

895

756

896

if(ret != GNUTLS_E_SUCCESS){

757

897

if(debug){

758

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

898

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

759

899

gnutls_perror(ret);

760

900

}

761

901

errno = EPROTO;

765

905

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

766

906

767

907

if(debug){

768

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

769

ip);

908

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

909

" %s\n", ip);

770

910

}

771

911

772

912

while(true){

777

917

}

778

918

779

919

buffer_capacity = incbuffer(&buffer, buffer_length,

780

buffer_capacity);

920

buffer_capacity);

781

921

if(buffer_capacity == 0){

782

922

int e = errno;

783

perror("incbuffer");

923

perror_plus("incbuffer");

784

924

errno = e;

785

925

goto mandos_end;

786

926

}

810

950

}

811

951

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

812

952

if(ret < 0){

813

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

953

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

954

"***\n");

814

955

gnutls_perror(ret);

815

956

errno = EPROTO;

816

957

goto mandos_end;

817

958

}

818

959

break;

819

960

default:

820

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

821

" encrypted session with Mandos server\n");

961

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

962

" encrypted session with Mandos server\n");

822

963

gnutls_bye(session, GNUTLS_SHUT_RDWR);

823

964

errno = EIO;

824

965

goto mandos_end;

829

970

}

830

971

831

972

if(debug){

832

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

973

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

833

974

}

834

975

835

976

if(quit_now){

847

988

848

989

if(buffer_length > 0){

849

990

ssize_t decrypted_buffer_size;

850

decrypted_buffer_size = pgp_packet_decrypt(buffer,

851

buffer_length,

852

&decrypted_buffer);

991

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

992

&decrypted_buffer, mc);

853

993

if(decrypted_buffer_size >= 0){

854

994

855

995

written = 0;

865

1005

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

866

1006

int e = errno;

867

1007

if(debug){

868

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

869

strerror(errno));

1008

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

1009

strerror(errno));

870

1010

}

871

1011

errno = e;

872

1012

goto mandos_end;

891

1031

if(e == 0){

892

1032

e = errno;

893

1033

}

894

perror("close");

1034

perror_plus("close");

895

1035

}

896

1036

gnutls_deinit(session);

1037

errno = e;

897

1038

if(quit_now){

898

e = EINTR;

1039

errno = EINTR;

899

1040

retval = -1;

900

1041

}

901

errno = e;

902

1042

}

903

1043

return retval;

904

1044

}

905

1045

1046

__attribute__((nonnull))

906

1047

static void resolve_callback(AvahiSServiceResolver *r,

907

1048

AvahiIfIndex interface,

908

1049

AvahiProtocol proto,

916

1057

AVAHI_GCC_UNUSED AvahiStringList *txt,

917

1058

AVAHI_GCC_UNUSED AvahiLookupResultFlags

918

1059

flags,

919

AVAHI_GCC_UNUSED void* userdata){

920

assert(r);

1060

void *mc){

1061

if(r == NULL){

1062

return;

1063

}

921

1064

922

1065

/* Called whenever a service has been resolved successfully or

923

1066

timed out */

929

1072

switch(event){

930

1073

default:

931

1074

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)));

1075

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

1076

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

1077

domain,

1078

avahi_strerror(avahi_server_errno

1079

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

935

1080

break;

936

1081

937

1082

case AVAHI_RESOLVER_FOUND:

939

1084

char ip[AVAHI_ADDRESS_STR_MAX];

940

1085

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

941

1086

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);

1087

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

1088

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

1089

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

945

1090

}

946

int ret = start_mandos_communication(ip, port, interface,

947

avahi_proto_to_af(proto));

1091

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

1092

interface,

1093

avahi_proto_to_af(proto),

1094

mc);

948

1095

if(ret == 0){

949

avahi_simple_poll_quit(mc.simple_poll);

1096

avahi_simple_poll_quit(simple_poll);

1097

} else {

1098

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

1099

avahi_proto_to_af(proto),

1100

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

1101

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

1102

" list\n", name);

1103

}

950

1104

}

951

1105

}

952

1106

}

962

1116

const char *domain,

963

1117

AVAHI_GCC_UNUSED AvahiLookupResultFlags

964

1118

flags,

965

AVAHI_GCC_UNUSED void* userdata){

966

assert(b);

1119

void *mc){

1120

if(b == NULL){

1121

return;

1122

}

967

1123

968

1124

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

969

1125

is removed from the LAN */

976

1132

default:

977

1133

case AVAHI_BROWSER_FAILURE:

978

1134

979

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

980

avahi_strerror(avahi_server_errno(mc.server)));

981

avahi_simple_poll_quit(mc.simple_poll);

1135

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

1136

avahi_strerror(avahi_server_errno

1137

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

1138

avahi_simple_poll_quit(simple_poll);

982

1139

return;

983

1140

984

1141

case AVAHI_BROWSER_NEW:

987

1144

the callback function is called the Avahi server will free the

988

1145

resolver for us. */

989

1146

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)));

1147

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

1148

interface, protocol, name, type,

1149

domain, protocol, 0,

1150

resolve_callback, mc) == NULL)

1151

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

1152

" %s\n", name,

1153

avahi_strerror(avahi_server_errno

1154

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

995

1155

break;

996

1156

997

1157

case AVAHI_BROWSER_REMOVE:

1000

1160

case AVAHI_BROWSER_ALL_FOR_NOW:

1001

1161

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1002

1162

if(debug){

1003

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

1163

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

1164

" searching...\n");

1004

1165

}

1005

1166

break;

1006

1167

}

1007

1168

}

1008

1169

1009

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

1170

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

1010

1171

static void handle_sigterm(int sig){

1011

1172

if(quit_now){

1012

1173

return;

1014

1175

quit_now = 1;

1015

1176

signal_received = sig;

1016

1177

int old_errno = errno;

1017

if(mc.simple_poll != NULL){

1018

avahi_simple_poll_quit(mc.simple_poll);

1019

}

1020

errno = old_errno;

1178

/* set main loop to exit */

1179

if(simple_poll != NULL){

1180

avahi_simple_poll_quit(simple_poll);

1181

}

1182

errno = old_errno;

1183

}

1184

1185

__attribute__((nonnull, warn_unused_result))

1186

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

1187

int ret;

1188

error_t ret_errno;

1189

1190

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

1191

if(s < 0){

1192

ret_errno = errno;

1193

perror_plus("socket");

1194

errno = ret_errno;

1195

return false;

1196

}

1197

strcpy(ifr->ifr_name, ifname);

1198

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1199

if(ret == -1){

1200

if(debug){

1201

ret_errno = errno;

1202

perror_plus("ioctl SIOCGIFFLAGS");

1203

errno = ret_errno;

1204

}

1205

return false;

1206

}

1207

return true;

1208

}

1209

1210

__attribute__((nonnull, warn_unused_result))

1211

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

1212

1213

/* Reject the loopback device */

1214

if(ifr->ifr_flags & IFF_LOOPBACK){

1215

if(debug){

1216

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

1217

ifname);

1218

}

1219

return false;

1220

}

1221

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

1222

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

1223

if(debug){

1224

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

1225

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

1226

}

1227

return true;

1228

}

1229

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

1230

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

1231

if(debug){

1232

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1233

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

1234

}

1235

return false;

1236

}

1237

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

1238

if(ifr->ifr_flags & IFF_NOARP){

1239

if(debug){

1240

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

1241

ifname);

1242

}

1243

return false;

1244

}

1245

1246

/* Accept this device */

1247

if(debug){

1248

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

1249

}

1250

return true;

1251

}

1252

1253

/*

1254

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

1255

* corresponds to an acceptable network device.

1256

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

1257

*/

1258

__attribute__((nonnull, warn_unused_result))

1259

int good_interface(const struct dirent *if_entry){

1260

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

1261

return 0;

1262

}

1263

1264

struct ifreq ifr;

1265

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

1266

if(debug){

1267

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

1268

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

1269

}

1270

return 0;

1271

}

1272

1273

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

1274

return 0;

1275

}

1276

return 1;

1277

}

1278

1279

/*

1280

* This function determines if a network interface is up.

1281

*/

1282

__attribute__((nonnull, warn_unused_result))

1283

bool interface_is_up(const char *interface){

1284

struct ifreq ifr;

1285

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

1286

if(debug){

1287

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

1288

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

1289

}

1290

return false;

1291

}

1292

1293

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

1294

}

1295

1296

/*

1297

* This function determines if a network interface is running

1298

*/

1299

__attribute__((nonnull, warn_unused_result))

1300

bool interface_is_running(const char *interface){

1301

struct ifreq ifr;

1302

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

1303

if(debug){

1304

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

1305

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

1306

}

1307

return false;

1308

}

1309

1310

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

1311

}

1312

1313

__attribute__((nonnull, pure, warn_unused_result))

1314

int notdotentries(const struct dirent *direntry){

1315

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

1316

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

1317

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

1318

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

1319

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

1320

return 0;

1321

}

1322

return 1;

1323

}

1324

1325

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

1326

__attribute__((nonnull, warn_unused_result))

1327

int runnable_hook(const struct dirent *direntry){

1328

int ret;

1329

size_t sret;

1330

struct stat st;

1331

1332

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

1333

/* Empty name? */

1334

return 0;

1335

}

1336

1337

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

1338

"abcdefghijklmnopqrstuvwxyz"

1339

"0123456789"

1340

"_.-");

1341

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

1342

/* Contains non-allowed characters */

1343

if(debug){

1344

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

1345

direntry->d_name);

1346

}

1347

return 0;

1348

}

1349

1350

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

1351

if(ret == -1){

1352

if(debug){

1353

perror_plus("Could not stat hook");

1354

}

1355

return 0;

1356

}

1357

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

1358

/* Not a regular file */

1359

if(debug){

1360

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

1361

direntry->d_name);

1362

}

1363

return 0;

1364

}

1365

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

1366

/* Not executable */

1367

if(debug){

1368

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

1369

direntry->d_name);

1370

}

1371

return 0;

1372

}

1373

if(debug){

1374

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

1375

direntry->d_name);

1376

}

1377

return 1;

1378

}

1379

1380

__attribute__((nonnull, warn_unused_result))

1381

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1382

mandos_context *mc){

1383

int ret;

1384

struct timespec now;

1385

struct timespec waited_time;

1386

intmax_t block_time;

1387

1388

while(true){

1389

if(mc->current_server == NULL){

1390

if(debug){

1391

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

1392

" No timeout!\n");

1393

}

1394

ret = avahi_simple_poll_iterate(s, -1);

1395

} else {

1396

if(debug){

1397

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

1398

" it, or wait\n");

1399

}

1400

/* the current time */

1401

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1402

if(ret == -1){

1403

perror_plus("clock_gettime");

1404

return -1;

1405

}

1406

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

1407

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

1408

waited_time.tv_sec = (now.tv_sec

1409

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

1410

waited_time.tv_nsec = (now.tv_nsec

1411

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

1412

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

1413

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

1414

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

1415

block_time = ((retry_interval

1416

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

1417

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

1418

1419

if(debug){

1420

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

1421

block_time);

1422

}

1423

1424

if(block_time <= 0){

1425

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

1426

mc->current_server->port,

1427

mc->current_server->if_index,

1428

mc->current_server->af, mc);

1429

if(ret == 0){

1430

avahi_simple_poll_quit(s);

1431

return 0;

1432

}

1433

ret = clock_gettime(CLOCK_MONOTONIC,

1434

&mc->current_server->last_seen);

1435

if(ret == -1){

1436

perror_plus("clock_gettime");

1437

return -1;

1438

}

1439

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

1440

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

1441

servers, but don't block */

1442

}

1443

1444

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

1445

}

1446

if(ret != 0){

1447

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

1448

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

1449

}

1450

}

1451

}

1452

}

1453

1454

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

1455

__attribute__((warn_unused_result))

1456

error_t raise_privileges(void){

1457

error_t old_errno = errno;

1458

error_t ret_errno = 0;

1459

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

1460

ret_errno = errno;

1461

perror_plus("seteuid");

1462

}

1463

errno = old_errno;

1464

return ret_errno;

1465

}

1466

1467

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

1468

__attribute__((warn_unused_result))

1469

error_t raise_privileges_permanently(void){

1470

error_t old_errno = errno;

1471

error_t ret_errno = raise_privileges();

1472

if(ret_errno != 0){

1473

errno = old_errno;

1474

return ret_errno;

1475

}

1476

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

1477

ret_errno = errno;

1478

perror_plus("seteuid");

1479

}

1480

errno = old_errno;

1481

return ret_errno;

1482

}

1483

1484

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

1485

__attribute__((warn_unused_result))

1486

error_t lower_privileges(void){

1487

error_t old_errno = errno;

1488

error_t ret_errno = 0;

1489

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

1490

ret_errno = errno;

1491

perror_plus("seteuid");

1492

}

1493

errno = old_errno;

1494

return ret_errno;

1495

}

1496

1497

/* Lower privileges permanently */

1498

__attribute__((warn_unused_result))

1499

error_t lower_privileges_permanently(void){

1500

error_t old_errno = errno;

1501

error_t ret_errno = 0;

1502

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

1503

ret_errno = errno;

1504

perror_plus("setuid");

1505

}

1506

errno = old_errno;

1507

return ret_errno;

1508

}

1509

1510

__attribute__((nonnull))

1511

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

1512

const float delay){

1513

struct dirent **direntries = NULL;

1514

if(hookdir_fd == -1){

1515

hookdir_fd = open(hookdir, O_RDONLY);

1516

if(hookdir_fd == -1){

1517

if(errno == ENOENT){

1518

if(debug){

1519

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

1520

" found\n", hookdir);

1521

}

1522

} else {

1523

perror_plus("open");

1524

}

1525

return;

1526

}

1527

}

1528

#ifdef __GLIBC__

1529

#if __GLIBC_PREREQ(2, 15)

1530

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

1531

runnable_hook, alphasort);

1532

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

1533

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

1534

alphasort);

1535

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

1536

#else /* not __GLIBC__ */

1537

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

1538

alphasort);

1539

#endif /* not __GLIBC__ */

1540

if(numhooks == -1){

1541

perror_plus("scandir");

1542

return;

1543

}

1544

struct dirent *direntry;

1545

int ret;

1546

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

1547

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

1548

direntry = direntries[i];

1549

if(debug){

1550

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

1551

direntry->d_name);

1552

}

1553

pid_t hook_pid = fork();

1554

if(hook_pid == 0){

1555

/* Child */

1556

/* Raise privileges */

1557

if(raise_privileges_permanently() != 0){

1558

perror_plus("Failed to raise privileges");

1559

_exit(EX_NOPERM);

1560

}

1561

/* Set group */

1562

errno = 0;

1563

ret = setgid(0);

1564

if(ret == -1){

1565

perror_plus("setgid");

1566

_exit(EX_NOPERM);

1567

}

1568

/* Reset supplementary groups */

1569

errno = 0;

1570

ret = setgroups(0, NULL);

1571

if(ret == -1){

1572

perror_plus("setgroups");

1573

_exit(EX_NOPERM);

1574

}

1575

ret = dup2(devnull, STDIN_FILENO);

1576

if(ret == -1){

1577

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

1578

_exit(EX_OSERR);

1579

}

1580

ret = close(devnull);

1581

if(ret == -1){

1582

perror_plus("close");

1583

_exit(EX_OSERR);

1584

}

1585

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1586

if(ret == -1){

1587

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

1588

_exit(EX_OSERR);

1589

}

1590

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

1591

if(ret == -1){

1592

perror_plus("setenv");

1593

_exit(EX_OSERR);

1594

}

1595

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

1596

if(ret == -1){

1597

perror_plus("setenv");

1598

_exit(EX_OSERR);

1599

}

1600

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

1601

if(ret == -1){

1602

perror_plus("setenv");

1603

_exit(EX_OSERR);

1604

}

1605

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

1606

if(ret == -1){

1607

perror_plus("setenv");

1608

_exit(EX_OSERR);

1609

}

1610

char *delaystring;

1611

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

1612

if(ret == -1){

1613

perror_plus("asprintf");

1614

_exit(EX_OSERR);

1615

}

1616

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

1617

if(ret == -1){

1618

free(delaystring);

1619

perror_plus("setenv");

1620

_exit(EX_OSERR);

1621

}

1622

free(delaystring);

1623

if(connect_to != NULL){

1624

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

1625

if(ret == -1){

1626

perror_plus("setenv");

1627

_exit(EX_OSERR);

1628

}

1629

}

1630

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

1631

if(hook_fd == -1){

1632

perror_plus("openat");

1633

_exit(EXIT_FAILURE);

1634

}

1635

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

1636

perror_plus("close");

1637

_exit(EXIT_FAILURE);

1638

}

1639

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

1640

environ) == -1){

1641

perror_plus("fexecve");

1642

_exit(EXIT_FAILURE);

1643

}

1644

} else {

1645

int status;

1646

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

1647

perror_plus("waitpid");

1648

continue;

1649

}

1650

if(WIFEXITED(status)){

1651

if(WEXITSTATUS(status) != 0){

1652

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

1653

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

1654

WEXITSTATUS(status));

1655

continue;

1656

}

1657

} else if(WIFSIGNALED(status)){

1658

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

1659

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

1660

WTERMSIG(status));

1661

continue;

1662

} else {

1663

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

1664

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

1665

continue;

1666

}

1667

}

1668

if(debug){

1669

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

1670

direntry->d_name);

1671

}

1672

}

1673

free(direntries);

1674

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

1675

perror_plus("close");

1676

} else {

1677

hookdir_fd = -1;

1678

}

1679

close(devnull);

1680

}

1681

1682

__attribute__((nonnull, warn_unused_result))

1683

error_t bring_up_interface(const char *const interface,

1684

const float delay){

1685

error_t old_errno = errno;

1686

int ret;

1687

struct ifreq network;

1688

unsigned int if_index = if_nametoindex(interface);

1689

if(if_index == 0){

1690

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

1691

errno = old_errno;

1692

return ENXIO;

1693

}

1694

1695

if(quit_now){

1696

errno = old_errno;

1697

return EINTR;

1698

}

1699

1700

if(not interface_is_up(interface)){

1701

error_t ret_errno = 0, ioctl_errno = 0;

1702

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

1703

ret_errno = errno;

1704

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

1705

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

1706

errno = old_errno;

1707

return ret_errno;

1708

}

1709

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

1710

1711

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

1712

if(sd == -1){

1713

ret_errno = errno;

1714

perror_plus("socket");

1715

errno = old_errno;

1716

return ret_errno;

1717

}

1718

1719

if(quit_now){

1720

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

1721

if(ret == -1){

1722

perror_plus("close");

1723

}

1724

errno = old_errno;

1725

return EINTR;

1726

}

1727

1728

if(debug){

1729

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

1730

interface);

1731

}

1732

1733

/* Raise privileges */

1734

ret_errno = raise_privileges();

1735

if(ret_errno != 0){

1736

perror_plus("Failed to raise privileges");

1737

}

1738

1739

#ifdef __linux__

1740

int ret_linux;

1741

bool restore_loglevel = false;

1742

if(ret_errno == 0){

1743

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1744

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

1745

ret_linux = klogctl(8, NULL, 5);

1746

if(ret_linux == -1){

1747

perror_plus("klogctl");

1748

} else {

1749

restore_loglevel = true;

1750

}

1751

}

1752

#endif /* __linux__ */

1753

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

1754

ioctl_errno = errno;

1755

#ifdef __linux__

1756

if(restore_loglevel){

1757

ret_linux = klogctl(7, NULL, 0);

1758

if(ret_linux == -1){

1759

perror_plus("klogctl");

1760

}

1761

}

1762

#endif /* __linux__ */

1763

1764

/* If raise_privileges() succeeded above */

1765

if(ret_errno == 0){

1766

/* Lower privileges */

1767

ret_errno = lower_privileges();

1768

if(ret_errno != 0){

1769

errno = ret_errno;

1770

perror_plus("Failed to lower privileges");

1771

}

1772

}

1773

1774

/* Close the socket */

1775

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

1776

if(ret == -1){

1777

perror_plus("close");

1778

}

1779

1780

if(ret_setflags == -1){

1781

errno = ioctl_errno;

1782

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1783

errno = old_errno;

1784

return ioctl_errno;

1785

}

1786

} else if(debug){

1787

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

1788

interface);

1789

}

1790

1791

/* Sleep checking until interface is running.

1792

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

1793

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

1794

if(interface_is_running(interface)){

1795

break;

1796

}

1797

struct timespec sleeptime = { .tv_nsec = 250000000 };

1798

ret = nanosleep(&sleeptime, NULL);

1799

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

1800

perror_plus("nanosleep");

1801

}

1802

}

1803

1804

errno = old_errno;

1805

return 0;

1806

}

1807

1808

__attribute__((nonnull, warn_unused_result))

1809

error_t take_down_interface(const char *const interface){

1810

error_t old_errno = errno;

1811

struct ifreq network;

1812

unsigned int if_index = if_nametoindex(interface);

1813

if(if_index == 0){

1814

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

1815

errno = old_errno;

1816

return ENXIO;

1817

}

1818

if(interface_is_up(interface)){

1819

error_t ret_errno = 0, ioctl_errno = 0;

1820

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

1821

ret_errno = errno;

1822

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

1823

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

1824

errno = old_errno;

1825

return ret_errno;

1826

}

1827

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

1828

1829

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

1830

if(sd == -1){

1831

ret_errno = errno;

1832

perror_plus("socket");

1833

errno = old_errno;

1834

return ret_errno;

1835

}

1836

1837

if(debug){

1838

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

1839

interface);

1840

}

1841

1842

/* Raise privileges */

1843

ret_errno = raise_privileges();

1844

if(ret_errno != 0){

1845

perror_plus("Failed to raise privileges");

1846

}

1847

1848

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

1849

ioctl_errno = errno;

1850

1851

/* If raise_privileges() succeeded above */

1852

if(ret_errno == 0){

1853

/* Lower privileges */

1854

ret_errno = lower_privileges();

1855

if(ret_errno != 0){

1856

errno = ret_errno;

1857

perror_plus("Failed to lower privileges");

1858

}

1859

}

1860

1861

/* Close the socket */

1862

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

1863

if(ret == -1){

1864

perror_plus("close");

1865

}

1866

1867

if(ret_setflags == -1){

1868

errno = ioctl_errno;

1869

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1870

errno = old_errno;

1871

return ioctl_errno;

1872

}

1873

} else if(debug){

1874

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

1875

interface);

1876

}

1877

1878

errno = old_errno;

1879

return 0;

1021

1880

}

1022

1881

1023

1882

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

1883

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

1884

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

1885

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

1886

.interfaces = NULL, .interfaces_size = 0 };

1024

1887

AvahiSServiceBrowser *sb = NULL;

1025

int error;

1888

error_t ret_errno;

1026

1889

int ret;

1027

1890

intmax_t tmpmax;

1028

1891

char *tmp;

1029

1892

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;

1893

char *interfaces_to_take_down = NULL;

1894

size_t interfaces_to_take_down_size = 0;

1895

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

1896

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

1897

char *tempdir = NULL;

1039

1898

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1040

1899

const char *seckey = PATHDIR "/" SECKEY;

1041

1900

const char *pubkey = PATHDIR "/" PUBKEY;

1901

char *interfaces_hooks = NULL;

1042

1902

1043

1903

bool gnutls_initialized = false;

1044

1904

bool gpgme_initialized = false;

1045

1905

float delay = 2.5f;

1906

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

1907

retrying the same server again */

1046

1908

1047

1909

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1048

1910

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1054

1916

errno = 0;

1055

1917

ret = setgid(gid);

1056

1918

if(ret == -1){

1057

perror("setgid");

1919

perror_plus("setgid");

1058

1920

}

1059

1921

1060

1922

/* Lower user privileges (temporarily) */

1061

1923

errno = 0;

1062

1924

ret = seteuid(uid);

1063

1925

if(ret == -1){

1064

perror("seteuid");

1926

perror_plus("seteuid");

1065

1927

}

1066

1928

1067

1929

if(quit_now){

1102

1964

.arg = "SECONDS",

1103

1965

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

1104

1966

.group = 2 },

1967

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

1968

.arg = "SECONDS",

1969

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

1970

.group = 2 },

1971

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

1972

.arg = "DIR",

1973

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

1974

.group = 2 },

1105

1975

/*

1106

1976

* These reproduce what we would get without ARGP_NO_HELP

1107

1977

*/

1125

1995

connect_to = arg;

1126

1996

break;

1127

1997

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

1128

interface = arg;

1998

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

1999

arg, (int)',');

2000

if(ret_errno != 0){

2001

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

2002

}

1129

2003

break;

1130

2004

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

1131

2005

seckey = arg;

1151

2025

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

1152

2026

argp_error(state, "Bad delay");

1153

2027

}

2028

case 132: /* --retry */

2029

errno = 0;

2030

retry_interval = strtod(arg, &tmp);

2031

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

2032

or (retry_interval * 1000) > INT_MAX

2033

or retry_interval < 0){

2034

argp_error(state, "Bad retry interval");

2035

}

2036

break;

2037

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

2038

hookdir = arg;

1154

2039

break;

1155

2040

/*

1156

2041

* These reproduce what we would get without ARGP_NO_HELP

1163

2048

argp_state_help(state, state->out_stream,

1164

2049

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1165

2050

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

1166

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

2051

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

1167

2052

exit(argp_err_exit_status);

1168

2053

break;

1169

2054

default:

1184

2069

case ENOMEM:

1185

2070

default:

1186

2071

errno = ret;

1187

perror("argp_parse");

2072

perror_plus("argp_parse");

1188

2073

exitcode = EX_OSERR;

1189

2074

goto end;

1190

2075

case EINVAL:

1192

2077

goto end;

1193

2078

}

1194

2079

}

2080

2081

{

2082

/* Work around Debian bug #633582:

2083

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

2084

2085

/* Re-raise privileges */

2086

ret_errno = raise_privileges();

2087

if(ret_errno != 0){

2088

errno = ret_errno;

2089

perror_plus("Failed to raise privileges");

2090

} else {

2091

struct stat st;

2092

2093

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

2094

int seckey_fd = open(seckey, O_RDONLY);

2095

if(seckey_fd == -1){

2096

perror_plus("open");

2097

} else {

2098

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

2099

if(ret == -1){

2100

perror_plus("fstat");

2101

} else {

2102

if(S_ISREG(st.st_mode)

2103

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

2104

ret = fchown(seckey_fd, uid, gid);

2105

if(ret == -1){

2106

perror_plus("fchown");

2107

}

2108

}

2109

}

2110

TEMP_FAILURE_RETRY(close(seckey_fd));

2111

}

2112

}

2113

2114

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

2115

int pubkey_fd = open(pubkey, O_RDONLY);

2116

if(pubkey_fd == -1){

2117

perror_plus("open");

2118

} else {

2119

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

2120

if(ret == -1){

2121

perror_plus("fstat");

2122

} else {

2123

if(S_ISREG(st.st_mode)

2124

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

2125

ret = fchown(pubkey_fd, uid, gid);

2126

if(ret == -1){

2127

perror_plus("fchown");

2128

}

2129

}

2130

}

2131

TEMP_FAILURE_RETRY(close(pubkey_fd));

2132

}

2133

}

2134

2135

/* Lower privileges */

2136

ret_errno = lower_privileges();

2137

if(ret_errno != 0){

2138

errno = ret_errno;

2139

perror_plus("Failed to lower privileges");

2140

}

2141

}

2142

}

2143

2144

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

2145

{

2146

char *interface = NULL;

2147

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

2148

interface))){

2149

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

2150

and if_nametoindex(interface) == 0){

2151

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

2152

fprintf_plus(stderr, "Not using nonexisting interface"

2153

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

2154

}

2155

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

2156

interface = NULL;

2157

}

2158

}

2159

}

2160

2161

/* Run network hooks */

2162

{

2163

if(mc.interfaces != NULL){

2164

interfaces_hooks = malloc(mc.interfaces_size);

2165

if(interfaces_hooks == NULL){

2166

perror_plus("malloc");

2167

goto end;

2168

}

2169

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

2170

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

2171

}

2172

run_network_hooks("start", interfaces_hooks != NULL ?

2173

interfaces_hooks : "", delay);

2174

}

1195

2175

1196

2176

if(not debug){

1197

2177

avahi_set_log_function(empty_log);

1201

2181

from the signal handler */

1202

2182

/* Initialize the pseudo-RNG for Avahi */

1203

2183

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");

2184

simple_poll = avahi_simple_poll_new();

2185

if(simple_poll == NULL){

2186

fprintf_plus(stderr,

2187

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

1207

2188

exitcode = EX_UNAVAILABLE;

1208

2189

goto end;

1209

2190

}

1211

2192

sigemptyset(&sigterm_action.sa_mask);

1212

2193

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

1213

2194

if(ret == -1){

1214

perror("sigaddset");

2195

perror_plus("sigaddset");

1215

2196

exitcode = EX_OSERR;

1216

2197

goto end;

1217

2198

}

1218

2199

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

1219

2200

if(ret == -1){

1220

perror("sigaddset");

2201

perror_plus("sigaddset");

1221

2202

exitcode = EX_OSERR;

1222

2203

goto end;

1223

2204

}

1224

2205

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

1225

2206

if(ret == -1){

1226

perror("sigaddset");

2207

perror_plus("sigaddset");

1227

2208

exitcode = EX_OSERR;

1228

2209

goto end;

1229

2210

}

1233

2214

*/

1234

2215

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

1235

2216

if(ret == -1){

1236

perror("sigaction");

2217

perror_plus("sigaction");

1237

2218

return EX_OSERR;

1238

2219

}

1239

2220

if(old_sigterm_action.sa_handler != SIG_IGN){

1240

2221

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

1241

2222

if(ret == -1){

1242

perror("sigaction");

2223

perror_plus("sigaction");

1243

2224

exitcode = EX_OSERR;

1244

2225

goto end;

1245

2226

}

1246

2227

}

1247

2228

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

1248

2229

if(ret == -1){

1249

perror("sigaction");

2230

perror_plus("sigaction");

1250

2231

return EX_OSERR;

1251

2232

}

1252

2233

if(old_sigterm_action.sa_handler != SIG_IGN){

1253

2234

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

1254

2235

if(ret == -1){

1255

perror("sigaction");

2236

perror_plus("sigaction");

1256

2237

exitcode = EX_OSERR;

1257

2238

goto end;

1258

2239

}

1259

2240

}

1260

2241

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

1261

2242

if(ret == -1){

1262

perror("sigaction");

2243

perror_plus("sigaction");

1263

2244

return EX_OSERR;

1264

2245

}

1265

2246

if(old_sigterm_action.sa_handler != SIG_IGN){

1266

2247

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

1267

2248

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");

2249

perror_plus("sigaction");

2250

exitcode = EX_OSERR;

2251

goto end;

2252

}

2253

}

2254

2255

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

2256

if(mc.interfaces == NULL){

2257

struct dirent **direntries = NULL;

2258

/* Look for any good interfaces */

2259

ret = scandir(sys_class_net, &direntries, good_interface,

2260

alphasort);

2261

if(ret >= 1){

2262

/* Add all found interfaces to interfaces list */

2263

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

2264

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

2265

direntries[i]->d_name);

2266

if(ret_errno != 0){

2267

errno = ret_errno;

2268

perror_plus("argz_add");

2269

continue;

2270

}

2271

if(debug){

2272

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

2273

direntries[i]->d_name);

2274

}

2275

}

2276

free(direntries);

2277

} else {

2278

if(ret == 0){

2279

free(direntries);

2280

}

2281

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

2282

exitcode = EXIT_FAILURE;

2283

goto end;

2284

}

2285

}

2286

2287

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

2288

{

2289

char *interface = NULL;

2290

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

2291

interface))){

2292

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

2293

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

2294

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

2295

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

2296

interface);

2297

interface = NULL;

2298

while((interface = argz_next(mc.interfaces,

2299

mc.interfaces_size, interface))){

2300

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

2301

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

2302

interface);

2303

interface = NULL;

1359

2304

}

1360

2305

}

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

2306

break;

1378

2307

}

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

}

2308

bool interface_was_up = interface_is_up(interface);

2309

errno = bring_up_interface(interface, delay);

2310

if(not interface_was_up){

2311

if(errno != 0){

2312

perror_plus("Failed to bring up interface");

2313

} else {

2314

errno = argz_add(&interfaces_to_take_down,

2315

&interfaces_to_take_down_size,

2316

interface);

2317

if(errno != 0){

2318

perror_plus("argz_add");

2319

}

2320

}

2321

}

2322

}

2323

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

2324

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

2325

}

2326

}

2327

2328

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

2329

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

2330

if(debug){

2331

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

2332

mc.interfaces);

2333

}

2334

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

1416

2335

}

1417

2336

1418

2337

if(quit_now){

1419

2338

goto end;

1420

2339

}

1421

2340

1422

ret = init_gnutls_global(pubkey, seckey);

2341

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

1423

2342

if(ret == -1){

1424

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

2343

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

1425

2344

exitcode = EX_UNAVAILABLE;

1426

2345

goto end;

1427

2346

} else {

1432

2351

goto end;

1433

2352

}

1434

2353

1435

tempdir_created = true;

1436

if(mkdtemp(tempdir) == NULL){

1437

tempdir_created = false;

1438

perror("mkdtemp");

2354

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

2355

tempdir = mkdtemp(run_tempdir);

2356

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

2357

if(debug){

2358

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

2359

run_tempdir, old_tempdir);

2360

}

2361

tempdir = mkdtemp(old_tempdir);

2362

}

2363

if(tempdir == NULL){

2364

perror_plus("mkdtemp");

1439

2365

goto end;

1440

2366

}

1441

2367

1443

2369

goto end;

1444

2370

}

1445

2371

1446

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

1447

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

2372

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

2373

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

1448

2374

exitcode = EX_UNAVAILABLE;

1449

2375

goto end;

1450

2376

} else {

1459

2385

/* Connect directly, do not use Zeroconf */

1460

2386

/* (Mainly meant for debugging) */

1461

2387

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

2388

1462

2389

if(address == NULL){

1463

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

2390

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

1464

2391

exitcode = EX_USAGE;

1465

2392

goto end;

1466

2393

}

1469

2396

goto end;

1470

2397

}

1471

2398

1472

uint16_t port;

2399

in_port_t port;

1473

2400

errno = 0;

1474

2401

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

1475

2402

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

1476

or tmpmax != (uint16_t)tmpmax){

1477

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

2403

or tmpmax != (in_port_t)tmpmax){

2404

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

1478

2405

exitcode = EX_USAGE;

1479

2406

goto end;

1480

2407

}

1481

2408

1482

2409

if(quit_now){

1483

2410

goto end;

1484

2411

}

1485

2412

1486

port = (uint16_t)tmpmax;

2413

port = (in_port_t)tmpmax;

1487

2414

*address = '\0';

1488

address = connect_to;

1489

2415

/* Colon in address indicates IPv6 */

1490

2416

int af;

1491

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

2417

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

1492

2418

af = AF_INET6;

2419

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

2420

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

2421

{

2422

connect_to++;

2423

address[-1] = '\0';

2424

}

1493

2425

} else {

1494

2426

af = AF_INET;

1495

2427

}

2428

address = connect_to;

1496

2429

1497

2430

if(quit_now){

1498

2431

goto end;

1499

2432

}

1500

2433

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 {

2434

while(not quit_now){

2435

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

2436

&mc);

2437

if(quit_now or ret == 0){

2438

break;

2439

}

2440

if(debug){

2441

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

2442

(int)retry_interval);

2443

}

2444

sleep((unsigned int)retry_interval);

2445

}

2446

2447

if(not quit_now){

1523

2448

exitcode = EXIT_SUCCESS;

1524

2449

}

2450

1525

2451

goto end;

1526

2452

}

1527

2453

1539

2465

config.publish_domain = 0;

1540

2466

1541

2467

/* Allocate a new server */

1542

mc.server = avahi_server_new(avahi_simple_poll_get

1543

(mc.simple_poll), &config, NULL,

1544

NULL, &error);

2468

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2469

&config, NULL, NULL, &ret_errno);

1545

2470

1546

2471

/* Free the Avahi configuration data */

1547

2472

avahi_server_config_free(&config);

1549

2474

1550

2475

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

1551

2476

if(mc.server == NULL){

1552

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

1553

avahi_strerror(error));

2477

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

2478

avahi_strerror(ret_errno));

1554

2479

exitcode = EX_UNAVAILABLE;

1555

2480

goto end;

1556

2481

}

1562

2487

/* Create the Avahi service browser */

1563

2488

sb = avahi_s_service_browser_new(mc.server, if_index,

1564

2489

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1565

NULL, 0, browse_callback, NULL);

2490

NULL, 0, browse_callback,

2491

(void *)&mc);

1566

2492

if(sb == NULL){

1567

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

1568

avahi_strerror(avahi_server_errno(mc.server)));

2493

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

2494

avahi_strerror(avahi_server_errno(mc.server)));

1569

2495

exitcode = EX_UNAVAILABLE;

1570

2496

goto end;

1571

2497

}

1577

2503

/* Run the main loop */

1578

2504

1579

2505

if(debug){

1580

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

2506

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

1581

2507

}

1582

2508

1583

avahi_simple_poll_loop(mc.simple_poll);

2509

ret = avahi_loop_with_timeout(simple_poll,

2510

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

2511

if(debug){

2512

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

2513

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

2514

}

1584

2515

1585

2516

end:

1586

2517

1587

2518

if(debug){

1588

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

2519

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

1589

2520

}

1590

2521

1591

2522

/* Cleanup things */

2523

free(mc.interfaces);

2524

1592

2525

if(sb != NULL)

1593

2526

avahi_s_service_browser_free(sb);

1594

2527

1595

2528

if(mc.server != NULL)

1596

2529

avahi_server_free(mc.server);

1597

2530

1598

if(mc.simple_poll != NULL)

1599

avahi_simple_poll_free(mc.simple_poll);

2531

if(simple_poll != NULL)

2532

avahi_simple_poll_free(simple_poll);

1600

2533

1601

2534

if(gnutls_initialized){

1602

2535

gnutls_certificate_free_credentials(mc.cred);

1608

2541

gpgme_release(mc.ctx);

1609

2542

}

1610

2543

1611

/* Take down the network interface */

1612

if(take_down_interface){

1613

/* Re-raise priviliges */

1614

errno = 0;

1615

ret = seteuid(0);

1616

if(ret == -1){

1617

perror("seteuid");

1618

}

1619

if(geteuid() == 0){

1620

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

1621

if(ret == -1){

1622

perror("ioctl SIOCGIFFLAGS");

1623

} else if(network.ifr_flags & IFF_UP) {

1624

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

1625

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

1626

if(ret == -1){

1627

perror("ioctl SIOCSIFFLAGS");

1628

}

1629

}

1630

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

1631

if(ret == -1){

1632

perror("close");

1633

}

1634

/* Lower privileges permanently */

1635

errno = 0;

1636

ret = setuid(uid);

1637

if(ret == -1){

1638

perror("setuid");

1639

}

1640

}

1641

}

1642

1643

/* Removes the temp directory used by GPGME */

1644

if(tempdir_created){

1645

DIR *d;

1646

struct dirent *direntry;

1647

d = opendir(tempdir);

1648

if(d == NULL){

1649

if(errno != ENOENT){

1650

perror("opendir");

1651

}

1652

} else {

1653

while(true){

1654

direntry = readdir(d);

1655

if(direntry == NULL){

1656

break;

1657

}

1658

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

1659

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

1660

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

1661

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

1662

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

1663

continue;

1664

}

1665

char *fullname = NULL;

1666

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

1667

direntry->d_name);

1668

if(ret < 0){

1669

perror("asprintf");

1670

continue;

1671

}

1672

ret = remove(fullname);

1673

if(ret == -1){

1674

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

1675

strerror(errno));

1676

}

1677

free(fullname);

1678

}

1679

closedir(d);

1680

}

1681

ret = rmdir(tempdir);

1682

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

1683

perror("rmdir");

2544

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

2545

has seen */

2546

if(mc.current_server != NULL){

2547

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

2548

while(mc.current_server != NULL){

2549

server *next = mc.current_server->next;

2550

free(mc.current_server);

2551

mc.current_server = next;

2552

}

2553

}

2554

2555

/* Re-raise privileges */

2556

{

2557

ret_errno = raise_privileges();

2558

if(ret_errno != 0){

2559

perror_plus("Failed to raise privileges");

2560

} else {

2561

2562

/* Run network hooks */

2563

run_network_hooks("stop", interfaces_hooks != NULL ?

2564

interfaces_hooks : "", delay);

2565

2566

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

2567

{

2568

char *interface = NULL;

2569

while((interface=argz_next(interfaces_to_take_down,

2570

interfaces_to_take_down_size,

2571

interface))){

2572

ret_errno = take_down_interface(interface);

2573

if(ret_errno != 0){

2574

errno = ret_errno;

2575

perror_plus("Failed to take down interface");

2576

}

2577

}

2578

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

2579

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

2580

" down\n");

2581

}

2582

}

2583

}

2584

2585

ret_errno = lower_privileges_permanently();

2586

if(ret_errno != 0){

2587

perror_plus("Failed to lower privileges permanently");

2588

}

2589

}

2590

2591

free(interfaces_to_take_down);

2592

free(interfaces_hooks);

2593

2594

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

2595

if(tempdir != NULL){

2596

struct dirent **direntries = NULL;

2597

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

2598

O_NOFOLLOW));

2599

if(tempdir_fd == -1){

2600

perror_plus("open");

2601

} else {

2602

#ifdef __GLIBC__

2603

#if __GLIBC_PREREQ(2, 15)

2604

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

2605

notdotentries, alphasort);

2606

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

2607

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

2608

alphasort);

2609

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

2610

#else /* not __GLIBC__ */

2611

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

2612

alphasort);

2613

#endif /* not __GLIBC__ */

2614

if(numentries >= 0){

2615

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

2616

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

2617

if(ret == -1){

2618

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

2619

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

2620

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

2621

}

2622

}

2623

2624

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

2625

free(direntries);

2626

if(numentries == -1){

2627

perror_plus("scandir");

2628

}

2629

ret = rmdir(tempdir);

2630

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

2631

perror_plus("rmdir");

2632

}

2633

}

2634

TEMP_FAILURE_RETRY(close(tempdir_fd));

1684

2635

}

1685

2636

}

1686

2637

1691

2642

&old_sigterm_action,

1692

2643

NULL));

1693

2644

if(ret == -1){

1694

perror("sigaction");

2645

perror_plus("sigaction");

1695

2646

}

1696

2647

do {

1697

2648

ret = raise(signal_received);

1698

2649

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

1699

2650

if(ret != 0){

1700

perror("raise");

2651

perror_plus("raise");

1701

2652

abort();

1702

2653

}

1703

2654

TEMP_FAILURE_RETRY(pause());