/mandos/release : revision 237.7.421

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

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

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

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

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asprintf(), strncpy(), strsignal()

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*/

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

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

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sockaddr_in6, PF_INET6,

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SOCK_STREAM, uid_t, gid_t, open(),

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opendir(), DIR */

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

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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(), AT_REMOVEDIR */

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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, EINTR, EINVAL,

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EAI_SYSTEM, ENETUNREACH,

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EHOSTUNREACH, ECONNREFUSED, EPROTO,

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EIO, ENOENT, ENXIO, ENOMEM, EISDIR,

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ENOTEMPTY,

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program_invocation_short_name */

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#include <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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105

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

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123

init_gnutls_session(),

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124

GNUTLS_* */

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125

#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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130

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

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138

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

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139

#define SECKEY "seckey.txt"

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140

#define PUBKEY "pubkey.txt"

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

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142

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143

bool debug = false;

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144

static const char mandos_protocol_version[] = "1";

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

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const char *argp_program_bug_address = "<mandos@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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154

/* 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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166

typedef struct {

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AvahiSimplePoll *simple_poll;

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167

AvahiServer *server;

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168

gnutls_certificate_credentials_t cred;

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169

unsigned int dh_bits;

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170

gnutls_dh_params_t dh_params;

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171

const char *priority;

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172

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;

140

176

} mandos_context;

141

177

142

/* 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"

145

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

178

/* global so signal handler can reach it*/

179

AvahiSimplePoll *simple_poll;

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180

147

181

sig_atomic_t quit_now = 0;

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182

int signal_received = 0;

149

183

184

/* Function to use when printing errors */

185

void perror_plus(const char *print_text){

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int e = errno;

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

188

program_invocation_short_name);

189

errno = e;

190

perror(print_text);

191

}

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193

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

194

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

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va_list ap;

196

va_start (ap, format);

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198

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

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program_invocation_short_name));

200

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

201

}

202

150

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/*

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

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

153

206

* "buffer_length" is how much is already used.

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207

*/

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__attribute__((nonnull, warn_unused_result))

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209

size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

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size_t buffer_capacity){

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211

if(buffer_length + BUFFER_SIZE > buffer_capacity){

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

159

if(buffer == NULL){

212

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

213

if(new_buf == NULL){

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int old_errno = errno;

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free(*buffer);

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errno = old_errno;

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*buffer = NULL;

160

218

return 0;

161

219

}

220

*buffer = new_buf;

162

221

buffer_capacity += BUFFER_SIZE;

163

222

}

164

223

return buffer_capacity;

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224

}

166

225

226

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

227

__attribute__((nonnull, warn_unused_result))

228

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

229

int af, server **current_server){

230

int ret;

231

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

232

if(new_server == NULL){

233

perror_plus("malloc");

234

return false;

235

}

236

*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 };

240

if(new_server->ip == NULL){

241

perror_plus("strdup");

242

free(new_server);

243

return false;

244

}

245

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

246

if(ret == -1){

247

perror_plus("clock_gettime");

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#ifdef __GNUC__

249

#pragma GCC diagnostic push

250

#pragma GCC diagnostic ignored "-Wcast-qual"

251

#endif

252

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

253

#ifdef __GNUC__

254

#pragma GCC diagnostic pop

255

#endif

256

free(new_server);

257

return false;

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}

259

/* Special case of first server */

260

if(*current_server == NULL){

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new_server->next = new_server;

262

new_server->prev = new_server;

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*current_server = new_server;

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} else {

265

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

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new_server->next = *current_server;

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

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new_server->prev->next = new_server;

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(*current_server)->prev = new_server;

270

}

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return true;

272

}

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/*

168

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* Initialize GPGME.

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276

*/

170

static bool init_gpgme(const char *seckey,

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const char *pubkey, const char *tempdir){

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__attribute__((nonnull, warn_unused_result))

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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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282

gpgme_error_t rc;

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283

gpgme_engine_info_t engine_info;

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284

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176

285

/*

177

286

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

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287

*/

179

bool import_key(const char *filename){

288

bool import_key(const char * const filename){

180

289

int ret;

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290

int fd;

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291

gpgme_data_t pgp_data;

183

292

184

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

185

294

if(fd == -1){

186

perror("open");

295

perror_plus("open");

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return false;

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297

}

189

298

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

191

300

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));

301

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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303

return false;

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304

}

196

305

197

rc = gpgme_op_import(mc.ctx, pgp_data);

306

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

198

307

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));

308

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

309

gpgme_strsource(rc), gpgme_strerror(rc));

201

310

return false;

202

311

}

203

312

204

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

313

ret = close(fd);

205

314

if(ret == -1){

206

perror("close");

315

perror_plus("close");

207

316

}

208

317

gpgme_data_release(pgp_data);

209

318

return true;

210

319

}

211

320

212

321

if(debug){

213

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

322

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

214

323

}

215

324

216

325

/* Init GPGME */

217

326

gpgme_check_version(NULL);

218

327

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

219

328

if(rc != GPG_ERR_NO_ERROR){

220

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

221

gpgme_strsource(rc), gpgme_strerror(rc));

329

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

330

gpgme_strsource(rc), gpgme_strerror(rc));

222

331

return false;

223

332

}

224

333

225

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

334

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

226

335

rc = gpgme_get_engine_info(&engine_info);

227

336

if(rc != GPG_ERR_NO_ERROR){

228

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

229

gpgme_strsource(rc), gpgme_strerror(rc));

337

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

338

gpgme_strsource(rc), gpgme_strerror(rc));

230

339

return false;

231

340

}

232

341

while(engine_info != NULL){

238

347

engine_info = engine_info->next;

239

348

}

240

349

if(engine_info == NULL){

241

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

350

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

351

tempdir);

242

352

return false;

243

353

}

244

354

245

355

/* Create new GPGME "context" */

246

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

356

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

247

357

if(rc != GPG_ERR_NO_ERROR){

248

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

249

gpgme_strsource(rc), gpgme_strerror(rc));

358

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

359

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

360

gpgme_strerror(rc));

250

361

return false;

251

362

}

252

363

261

372

* Decrypt OpenPGP data.

262

373

* Returns -1 on error

263

374

*/

375

__attribute__((nonnull, warn_unused_result))

264

376

static ssize_t pgp_packet_decrypt(const char *cryptotext,

265

377

size_t crypto_size,

266

char **plaintext){

378

char **plaintext,

379

mandos_context *mc){

267

380

gpgme_data_t dh_crypto, dh_plain;

268

381

gpgme_error_t rc;

269

382

ssize_t ret;

271

384

ssize_t plaintext_length = 0;

272

385

273

386

if(debug){

274

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

387

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

275

388

}

276

389

277

390

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

278

391

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

279

392

0);

280

393

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));

394

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

395

gpgme_strsource(rc), gpgme_strerror(rc));

283

396

return -1;

284

397

}

285

398

286

399

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

287

400

rc = gpgme_data_new(&dh_plain);

288

401

if(rc != GPG_ERR_NO_ERROR){

289

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

290

gpgme_strsource(rc), gpgme_strerror(rc));

402

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

403

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

404

gpgme_strsource(rc), gpgme_strerror(rc));

291

405

gpgme_data_release(dh_crypto);

292

406

return -1;

293

407

}

294

408

295

409

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

296

410

data buffer */

297

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

411

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

298

412

if(rc != GPG_ERR_NO_ERROR){

299

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

300

gpgme_strsource(rc), gpgme_strerror(rc));

413

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

414

gpgme_strsource(rc), gpgme_strerror(rc));

301

415

plaintext_length = -1;

302

416

if(debug){

303

417

gpgme_decrypt_result_t result;

304

result = gpgme_op_decrypt_result(mc.ctx);

418

result = gpgme_op_decrypt_result(mc->ctx);

305

419

if(result == NULL){

306

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

420

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

307

421

} 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);

422

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

423

result->unsupported_algorithm);

424

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

425

result->wrong_key_usage);

312

426

if(result->file_name != NULL){

313

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

427

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

314

428

}

315

429

gpgme_recipient_t recipient;

316

430

recipient = result->recipients;

317

431

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");

432

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

433

gpgme_pubkey_algo_name

434

(recipient->pubkey_algo));

435

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

436

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

437

recipient->status == GPG_ERR_NO_SECKEY

438

? "No" : "Yes");

324

439

recipient = recipient->next;

325

440

}

326

441

}

329

444

}

330

445

331

446

if(debug){

332

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

447

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

333

448

}

334

449

335

450

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

336

451

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

337

perror("gpgme_data_seek");

452

perror_plus("gpgme_data_seek");

338

453

plaintext_length = -1;

339

454

goto decrypt_end;

340

455

}

342

457

*plaintext = NULL;

343

458

while(true){

344

459

plaintext_capacity = incbuffer(plaintext,

345

(size_t)plaintext_length,

346

plaintext_capacity);

460

(size_t)plaintext_length,

461

plaintext_capacity);

347

462

if(plaintext_capacity == 0){

348

perror("incbuffer");

349

plaintext_length = -1;

350

goto decrypt_end;

463

perror_plus("incbuffer");

464

plaintext_length = -1;

465

goto decrypt_end;

351

466

}

352

467

353

468

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

358

473

break;

359

474

}

360

475

if(ret < 0){

361

perror("gpgme_data_read");

476

perror_plus("gpgme_data_read");

362

477

plaintext_length = -1;

363

478

goto decrypt_end;

364

479

}

366

481

}

367

482

368

483

if(debug){

369

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

484

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

370

485

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

371

486

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

372

487

}

383

498

return plaintext_length;

384

499

}

385

500

386

static const char * safer_gnutls_strerror(int value){

387

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

388

-Wunreachable-code */

389

if(ret == NULL)

390

ret = "(unknown)";

391

return ret;

501

__attribute__((warn_unused_result, const))

502

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

503

if(str == NULL)

504

return "(unknown)";

505

return str;

506

}

507

508

__attribute__((warn_unused_result))

509

static const char *safer_gnutls_strerror(int value){

510

const char *ret = gnutls_strerror(value);

511

return safe_string(ret);

392

512

}

393

513

394

514

/* GnuTLS log function callback */

515

__attribute__((nonnull))

395

516

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

396

517

const char* string){

397

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

518

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

398

519

}

399

520

521

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

400

522

static int init_gnutls_global(const char *pubkeyfilename,

401

const char *seckeyfilename){

523

const char *seckeyfilename,

524

const char *dhparamsfilename,

525

mandos_context *mc){

402

526

int ret;

527

unsigned int uret;

403

528

404

529

if(debug){

405

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

406

}

407

408

ret = gnutls_global_init();

409

if(ret != GNUTLS_E_SUCCESS){

410

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

411

safer_gnutls_strerror(ret));

412

return -1;

530

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

413

531

}

414

532

415

533

if(debug){

421

539

}

422

540

423

541

/* OpenPGP credentials */

424

gnutls_certificate_allocate_credentials(&mc.cred);

542

ret = gnutls_certificate_allocate_credentials(&mc->cred);

425

543

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));

431

gnutls_global_deinit();

544

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

545

safer_gnutls_strerror(ret));

432

546

return -1;

433

547

}

434

548

435

549

if(debug){

436

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

437

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

438

seckeyfilename);

550

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

551

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

552

pubkeyfilename,

553

seckeyfilename);

439

554

}

440

555

441

556

ret = gnutls_certificate_set_openpgp_key_file

442

(mc.cred, pubkeyfilename, seckeyfilename,

557

(mc->cred, pubkeyfilename, seckeyfilename,

443

558

GNUTLS_OPENPGP_FMT_BASE64);

444

559

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));

560

fprintf_plus(stderr,

561

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

562

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

563

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

564

safer_gnutls_strerror(ret));

450

565

goto globalfail;

451

566

}

452

567

453

568

/* GnuTLS server initialization */

454

ret = gnutls_dh_params_init(&mc.dh_params);

455

if(ret != GNUTLS_E_SUCCESS){

456

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

457

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

458

goto globalfail;

459

}

460

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

461

if(ret != GNUTLS_E_SUCCESS){

462

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

463

safer_gnutls_strerror(ret));

464

goto globalfail;

465

}

466

467

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

569

ret = gnutls_dh_params_init(&mc->dh_params);

570

if(ret != GNUTLS_E_SUCCESS){

571

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

572

" initialization: %s\n",

573

safer_gnutls_strerror(ret));

574

goto globalfail;

575

}

576

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

577

if(dhparamsfilename != NULL){

578

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

579

do {

580

int dhpfile = open(dhparamsfilename, O_RDONLY);

581

if(dhpfile == -1){

582

perror_plus("open");

583

dhparamsfilename = NULL;

584

break;

585

}

586

size_t params_capacity = 0;

587

while(true){

588

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

589

(size_t)params.size,

590

(size_t)params_capacity);

591

if(params_capacity == 0){

592

perror_plus("incbuffer");

593

free(params.data);

594

params.data = NULL;

595

dhparamsfilename = NULL;

596

break;

597

}

598

ssize_t bytes_read = read(dhpfile,

599

params.data + params.size,

600

BUFFER_SIZE);

601

/* EOF */

602

if(bytes_read == 0){

603

break;

604

}

605

/* check bytes_read for failure */

606

if(bytes_read < 0){

607

perror_plus("read");

608

free(params.data);

609

params.data = NULL;

610

dhparamsfilename = NULL;

611

break;

612

}

613

params.size += (unsigned int)bytes_read;

614

}

615

if(params.data == NULL){

616

dhparamsfilename = NULL;

617

}

618

if(dhparamsfilename == NULL){

619

break;

620

}

621

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

622

GNUTLS_X509_FMT_PEM);

623

if(ret != GNUTLS_E_SUCCESS){

624

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

625

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

626

safer_gnutls_strerror(ret));

627

dhparamsfilename = NULL;

628

}

629

} while(false);

630

}

631

if(dhparamsfilename == NULL){

632

if(mc->dh_bits == 0){

633

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

634

/* Try to read the private key file */

635

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

636

do {

637

int secfile = open(seckeyfilename, O_RDONLY);

638

if(secfile == -1){

639

perror_plus("open");

640

break;

641

}

642

size_t buffer_capacity = 0;

643

while(true){

644

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

645

(size_t)buffer.size,

646

(size_t)buffer_capacity);

647

if(buffer_capacity == 0){

648

perror_plus("incbuffer");

649

free(buffer.data);

650

buffer.data = NULL;

651

break;

652

}

653

ssize_t bytes_read = read(secfile,

654

buffer.data + buffer.size,

655

BUFFER_SIZE);

656

/* EOF */

657

if(bytes_read == 0){

658

break;

659

}

660

/* check bytes_read for failure */

661

if(bytes_read < 0){

662

perror_plus("read");

663

free(buffer.data);

664

buffer.data = NULL;

665

break;

666

}

667

buffer.size += (unsigned int)bytes_read;

668

}

669

close(secfile);

670

} while(false);

671

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

672

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

673

if(buffer.data != NULL){

674

{

675

gnutls_openpgp_privkey_t privkey = NULL;

676

ret = gnutls_openpgp_privkey_init(&privkey);

677

if(ret != GNUTLS_E_SUCCESS){

678

fprintf_plus(stderr, "Error initializing OpenPGP key"

679

" structure: %s",

680

safer_gnutls_strerror(ret));

681

free(buffer.data);

682

buffer.data = NULL;

683

} else {

684

ret = gnutls_openpgp_privkey_import

685

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

686

if(ret != GNUTLS_E_SUCCESS){

687

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

688

safer_gnutls_strerror(ret));

689

privkey = NULL;

690

}

691

free(buffer.data);

692

buffer.data = NULL;

693

if(privkey != NULL){

694

/* Use private key to suggest an appropriate

695

sec_param */

696

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

697

gnutls_openpgp_privkey_deinit(privkey);

698

if(debug){

699

fprintf_plus(stderr, "This OpenPGP key implies using"

700

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

701

safe_string(gnutls_sec_param_get_name

702

(sec_param)));

703

}

704

}

705

}

706

}

707

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

708

/* Err on the side of caution */

709

sec_param = GNUTLS_SEC_PARAM_ULTRA;

710

if(debug){

711

fprintf_plus(stderr, "Falling back to security parameter"

712

" \"%s\"\n",

713

safe_string(gnutls_sec_param_get_name

714

(sec_param)));

715

}

716

}

717

}

718

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

719

if(uret != 0){

720

mc->dh_bits = uret;

721

if(debug){

722

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

723

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

724

safe_string(gnutls_sec_param_get_name

725

(sec_param)),

726

mc->dh_bits);

727

}

728

} else {

729

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

730

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

731

safe_string(gnutls_sec_param_get_name

732

(sec_param)),

733

safer_gnutls_strerror(ret));

734

goto globalfail;

735

}

736

} else if(debug){

737

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

738

mc->dh_bits);

739

}

740

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

741

if(ret != GNUTLS_E_SUCCESS){

742

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

743

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

744

safer_gnutls_strerror(ret));

745

goto globalfail;

746

}

747

}

748

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

468

749

469

750

return 0;

470

751

471

752

globalfail:

472

753

473

gnutls_certificate_free_credentials(mc.cred);

474

gnutls_global_deinit();

475

gnutls_dh_params_deinit(mc.dh_params);

754

gnutls_certificate_free_credentials(mc->cred);

755

gnutls_dh_params_deinit(mc->dh_params);

476

756

return -1;

477

757

}

478

758

479

static int init_gnutls_session(gnutls_session_t *session){

759

__attribute__((nonnull, warn_unused_result))

760

static int init_gnutls_session(gnutls_session_t *session,

761

mandos_context *mc){

480

762

int ret;

481

763

/* GnuTLS session creation */

482

764

do {

486

768

}

487

769

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

488

770

if(ret != GNUTLS_E_SUCCESS){

489

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

490

safer_gnutls_strerror(ret));

771

fprintf_plus(stderr,

772

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

773

safer_gnutls_strerror(ret));

491

774

}

492

775

493

776

{

494

777

const char *err;

495

778

do {

496

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

779

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

497

780

if(quit_now){

498

781

gnutls_deinit(*session);

499

782

return -1;

500

783

}

501

784

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

502

785

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));

786

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

787

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

788

safer_gnutls_strerror(ret));

506

789

gnutls_deinit(*session);

507

790

return -1;

508

791

}

510

793

511

794

do {

512

795

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

513

mc.cred);

796

mc->cred);

514

797

if(quit_now){

515

798

gnutls_deinit(*session);

516

799

return -1;

517

800

}

518

801

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

519

802

if(ret != GNUTLS_E_SUCCESS){

520

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

521

safer_gnutls_strerror(ret));

803

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

804

safer_gnutls_strerror(ret));

522

805

gnutls_deinit(*session);

523

806

return -1;

524

807

}

526

809

/* ignore client certificate if any. */

527

810

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

528

811

529

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

530

531

812

return 0;

532

813

}

533

814

535

816

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

536

817

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

537

818

819

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

820

__attribute__((warn_unused_result))

821

int raise_privileges(void){

822

int old_errno = errno;

823

int ret = 0;

824

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

825

ret = errno;

826

}

827

errno = old_errno;

828

return ret;

829

}

830

831

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

832

__attribute__((warn_unused_result))

833

int raise_privileges_permanently(void){

834

int old_errno = errno;

835

int ret = raise_privileges();

836

if(ret != 0){

837

errno = old_errno;

838

return ret;

839

}

840

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

841

ret = errno;

842

}

843

errno = old_errno;

844

return ret;

845

}

846

847

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

848

__attribute__((warn_unused_result))

849

int lower_privileges(void){

850

int old_errno = errno;

851

int ret = 0;

852

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

853

ret = errno;

854

}

855

errno = old_errno;

856

return ret;

857

}

858

859

/* Lower privileges permanently */

860

__attribute__((warn_unused_result))

861

int lower_privileges_permanently(void){

862

int old_errno = errno;

863

int ret = 0;

864

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

865

ret = errno;

866

}

867

errno = old_errno;

868

return ret;

869

}

870

871

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

872

__attribute__((nonnull, warn_unused_result))

873

static bool add_delete_local_route(const bool add,

874

const char *address,

875

AvahiIfIndex if_index){

876

int ret;

877

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

878

char add_arg[] = "add";

879

char delete_arg[] = "delete";

880

char debug_flag[] = "--debug";

881

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

882

if(pluginhelperdir == NULL){

883

if(debug){

884

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

885

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

886

}

887

return false;

888

}

889

890

char interface[IF_NAMESIZE];

891

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

892

perror_plus("if_indextoname");

893

return false;

894

}

895

896

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

897

if(devnull == -1){

898

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

899

return false;

900

}

901

pid_t pid = fork();

902

if(pid == 0){

903

/* Child */

904

/* Raise privileges */

905

errno = raise_privileges_permanently();

906

if(errno != 0){

907

perror_plus("Failed to raise privileges");

908

/* _exit(EX_NOPERM); */

909

} else {

910

/* Set group */

911

errno = 0;

912

ret = setgid(0);

913

if(ret == -1){

914

perror_plus("setgid");

915

_exit(EX_NOPERM);

916

}

917

/* Reset supplementary groups */

918

errno = 0;

919

ret = setgroups(0, NULL);

920

if(ret == -1){

921

perror_plus("setgroups");

922

_exit(EX_NOPERM);

923

}

924

}

925

ret = dup2(devnull, STDIN_FILENO);

926

if(ret == -1){

927

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

928

_exit(EX_OSERR);

929

}

930

ret = close(devnull);

931

if(ret == -1){

932

perror_plus("close");

933

_exit(EX_OSERR);

934

}

935

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

936

if(ret == -1){

937

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

938

_exit(EX_OSERR);

939

}

940

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

941

O_RDONLY

942

| O_DIRECTORY

943

| O_PATH

944

| O_CLOEXEC));

945

if(helperdir_fd == -1){

946

perror_plus("open");

947

_exit(EX_UNAVAILABLE);

948

}

949

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

950

helper, O_RDONLY));

951

if(helper_fd == -1){

952

perror_plus("openat");

953

close(helperdir_fd);

954

_exit(EX_UNAVAILABLE);

955

}

956

close(helperdir_fd);

957

#ifdef __GNUC__

958

#pragma GCC diagnostic push

959

#pragma GCC diagnostic ignored "-Wcast-qual"

960

#endif

961

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

962

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

963

interface, debug ? debug_flag : NULL, NULL },

964

environ) == -1){

965

#ifdef __GNUC__

966

#pragma GCC diagnostic pop

967

#endif

968

perror_plus("fexecve");

969

_exit(EXIT_FAILURE);

970

}

971

}

972

if(pid == -1){

973

perror_plus("fork");

974

return false;

975

}

976

int status;

977

pid_t pret = -1;

978

errno = 0;

979

do {

980

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

981

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

982

int errno_raising = 0;

983

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

984

errno_raising = errno;

985

perror_plus("Failed to raise privileges in order to"

986

" kill helper program");

987

}

988

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

989

perror_plus("kill");

990

}

991

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

992

perror_plus("Failed to lower privileges after killing"

993

" helper program");

994

}

995

return false;

996

}

997

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

998

if(pret == -1){

999

perror_plus("waitpid");

1000

return false;

1001

}

1002

if(WIFEXITED(status)){

1003

if(WEXITSTATUS(status) != 0){

1004

fprintf_plus(stderr, "Error: iprouteadddel exited"

1005

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

1006

return false;

1007

}

1008

return true;

1009

}

1010

if(WIFSIGNALED(status)){

1011

fprintf_plus(stderr, "Error: iprouteadddel died by"

1012

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

1013

return false;

1014

}

1015

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

1016

return false;

1017

}

1018

1019

__attribute__((nonnull, warn_unused_result))

1020

static bool add_local_route(const char *address,

1021

AvahiIfIndex if_index){

1022

if(debug){

1023

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

1024

}

1025

return add_delete_local_route(true, address, if_index);

1026

}

1027

1028

__attribute__((nonnull, warn_unused_result))

1029

static bool delete_local_route(const char *address,

1030

AvahiIfIndex if_index){

1031

if(debug){

1032

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

1033

}

1034

return add_delete_local_route(false, address, if_index);

1035

}

1036

538

1037

/* Called when a Mandos server is found */

539

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

1038

__attribute__((nonnull, warn_unused_result))

1039

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

540

1040

AvahiIfIndex if_index,

541

int af){

1041

int af, mandos_context *mc){

542

1042

int ret, tcp_sd = -1;

543

1043

ssize_t sret;

544

union {

545

struct sockaddr_in in;

546

struct sockaddr_in6 in6;

547

} to;

1044

struct sockaddr_storage to;

548

1045

char *buffer = NULL;

549

1046

char *decrypted_buffer = NULL;

550

1047

size_t buffer_length = 0;

553

1050

int retval = -1;

554

1051

gnutls_session_t session;

555

1052

int pf; /* Protocol family */

1053

bool route_added = false;

556

1054

557

1055

errno = 0;

558

1056

569

1067

pf = PF_INET;

570

1068

break;

571

1069

default:

572

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

1070

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

573

1071

errno = EINVAL;

574

1072

return -1;

575

1073

}

576

1074

577

ret = init_gnutls_session(&session);

1075

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

1076

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

1077

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

1078

bool match = false;

1079

{

1080

char *interface = NULL;

1081

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

1082

interface))){

1083

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

1084

match = true;

1085

break;

1086

}

1087

}

1088

}

1089

if(not match){

1090

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

1091

connect to the server */

1092

if(debug){

1093

char interface[IF_NAMESIZE];

1094

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

1095

perror_plus("if_indextoname");

1096

} else {

1097

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

1098

" \"%s\"\n",

1099

if_indextoname((unsigned int)if_index,

1100

interface));

1101

}

1102

}

1103

return -1;

1104

}

1105

}

1106

1107

ret = init_gnutls_session(&session, mc);

578

1108

if(ret != 0){

579

1109

return -1;

580

1110

}

581

1111

582

1112

if(debug){

583

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

584

"\n", ip, port);

1113

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

1114

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

585

1115

}

586

1116

587

tcp_sd = socket(pf, SOCK_STREAM, 0);

1117

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

588

1118

if(tcp_sd < 0){

589

1119

int e = errno;

590

perror("socket");

1120

perror_plus("socket");

591

1121

errno = e;

592

1122

goto mandos_end;

593

1123

}

597

1127

goto mandos_end;

598

1128

}

599

1129

600

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

601

1130

if(af == AF_INET6){

602

to.in6.sin6_family = (sa_family_t)af;

603

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

1131

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

1132

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

1133

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

604

1134

} else { /* IPv4 */

605

to.in.sin_family = (sa_family_t)af;

606

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

1135

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

1136

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

1137

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

607

1138

}

608

1139

if(ret < 0 ){

609

1140

int e = errno;

610

perror("inet_pton");

1141

perror_plus("inet_pton");

611

1142

errno = e;

612

1143

goto mandos_end;

613

1144

}

614

1145

if(ret == 0){

615

1146

int e = errno;

616

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

1147

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

617

1148

errno = e;

618

1149

goto mandos_end;

619

1150

}

620

1151

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*/

1152

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

1153

if(IN6_IS_ADDR_LINKLOCAL

1154

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

628

1155

if(if_index == AVAHI_IF_UNSPEC){

629

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

630

" without a network interface\n");

1156

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

1157

" incomplete without a network interface\n");

631

1158

errno = EINVAL;

632

1159

goto mandos_end;

633

1160

}

634

1161

/* Set the network interface number as scope */

635

to.in6.sin6_scope_id = (uint32_t)if_index;

1162

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

636

1163

}

637

1164

} else {

638

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

639

-Wconversion and

640

-Wunreachable-code */

1165

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

641

1166

}

642

1167

643

1168

if(quit_now){

649

1174

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

650

1175

char interface[IF_NAMESIZE];

651

1176

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

652

perror("if_indextoname");

1177

perror_plus("if_indextoname");

653

1178

} else {

654

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

655

ip, interface, port);

1179

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

1180

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

656

1181

}

657

1182

} else {

658

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

659

port);

1183

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

1184

ip, (uintmax_t)port);

660

1185

}

661

1186

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

662

1187

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

663

const char *pcret;

664

if(af == AF_INET6){

665

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

666

sizeof(addrstr));

667

} else {

668

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

669

sizeof(addrstr));

670

}

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

}

677

}

678

}

679

680

if(quit_now){

681

errno = EINTR;

682

goto mandos_end;

683

}

684

685

if(af == AF_INET6){

686

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

687

} else {

688

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

689

}

690

if(ret < 0){

691

int e = errno;

692

perror("connect");

693

errno = e;

694

goto mandos_end;

695

}

696

697

if(quit_now){

698

errno = EINTR;

699

goto mandos_end;

1188

if(af == AF_INET6){

1189

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

1190

sizeof(struct sockaddr_in6),

1191

addrstr, sizeof(addrstr), NULL, 0,

1192

NI_NUMERICHOST);

1193

} else {

1194

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

1195

sizeof(struct sockaddr_in),

1196

addrstr, sizeof(addrstr), NULL, 0,

1197

NI_NUMERICHOST);

1198

}

1199

if(ret == EAI_SYSTEM){

1200

perror_plus("getnameinfo");

1201

} else if(ret != 0) {

1202

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

1203

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

1204

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

1205

}

1206

}

1207

1208

if(quit_now){

1209

errno = EINTR;

1210

goto mandos_end;

1211

}

1212

1213

while(true){

1214

if(af == AF_INET6){

1215

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

1216

sizeof(struct sockaddr_in6));

1217

} else {

1218

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

1219

sizeof(struct sockaddr_in));

1220

}

1221

if(ret < 0){

1222

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

1223

and if_index != AVAHI_IF_UNSPEC

1224

and connect_to == NULL

1225

and not route_added and

1226

((af == AF_INET6 and not

1227

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1228

&to)->sin6_addr)))

1229

or (af == AF_INET and

1230

/* Not a a IPv4LL address */

1231

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

1232

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

1233

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

1234

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

1235

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

1236

connect to a Mandos server announced by Avahi on a server

1237

host with a global address. Work around this by retrying

1238

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

1239

1240

Avahi bug reference:

1241

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

1242

https://bugs.debian.org/587961

1243

*/

1244

if(debug){

1245

fprintf_plus(stderr, "Mandos server unreachable, trying"

1246

" direct route\n");

1247

}

1248

int e = errno;

1249

route_added = add_local_route(ip, if_index);

1250

if(route_added){

1251

continue;

1252

}

1253

errno = e;

1254

}

1255

if(errno != ECONNREFUSED or debug){

1256

int e = errno;

1257

perror_plus("connect");

1258

errno = e;

1259

}

1260

goto mandos_end;

1261

}

1262

1263

if(quit_now){

1264

errno = EINTR;

1265

goto mandos_end;

1266

}

1267

break;

700

1268

}

701

1269

702

1270

const char *out = mandos_protocol_version;

704

1272

while(true){

705

1273

size_t out_size = strlen(out);

706

1274

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

707

out_size - written));

1275

out_size - written));

708

1276

if(ret == -1){

709

1277

int e = errno;

710

perror("write");

1278

perror_plus("write");

711

1279

errno = e;

712

1280

goto mandos_end;

713

1281

}

730

1298

}

731

1299

732

1300

if(debug){

733

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

1301

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

734

1302

}

735

1303

736

1304

if(quit_now){

738

1306

goto mandos_end;

739

1307

}

740

1308

741

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

1309

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

1310

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

1311

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

1312

gnutls_transport_set_ptr(session,

1313

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

742

1314

743

1315

if(quit_now){

744

1316

errno = EINTR;

755

1327

756

1328

if(ret != GNUTLS_E_SUCCESS){

757

1329

if(debug){

758

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

1330

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

759

1331

gnutls_perror(ret);

760

1332

}

761

1333

errno = EPROTO;

765

1337

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

766

1338

767

1339

if(debug){

768

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

769

ip);

1340

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

1341

" %s\n", ip);

770

1342

}

771

1343

772

1344

while(true){

777

1349

}

778

1350

779

1351

buffer_capacity = incbuffer(&buffer, buffer_length,

780

buffer_capacity);

1352

buffer_capacity);

781

1353

if(buffer_capacity == 0){

782

1354

int e = errno;

783

perror("incbuffer");

1355

perror_plus("incbuffer");

784

1356

errno = e;

785

1357

goto mandos_end;

786

1358

}

810

1382

}

811

1383

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

812

1384

if(ret < 0){

813

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

1385

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

1386

"***\n");

814

1387

gnutls_perror(ret);

815

1388

errno = EPROTO;

816

1389

goto mandos_end;

817

1390

}

818

1391

break;

819

1392

default:

820

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

821

" encrypted session with Mandos server\n");

1393

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

1394

" encrypted session with Mandos server\n");

822

1395

gnutls_bye(session, GNUTLS_SHUT_RDWR);

823

1396

errno = EIO;

824

1397

goto mandos_end;

829

1402

}

830

1403

831

1404

if(debug){

832

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

1405

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

833

1406

}

834

1407

835

1408

if(quit_now){

847

1420

848

1421

if(buffer_length > 0){

849

1422

ssize_t decrypted_buffer_size;

850

decrypted_buffer_size = pgp_packet_decrypt(buffer,

851

buffer_length,

852

&decrypted_buffer);

1423

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

1424

&decrypted_buffer, mc);

853

1425

if(decrypted_buffer_size >= 0){

854

1426

1427

clearerr(stdout);

855

1428

written = 0;

856

1429

while(written < (size_t) decrypted_buffer_size){

857

1430

if(quit_now){

865

1438

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

866

1439

int e = errno;

867

1440

if(debug){

868

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

869

strerror(errno));

1441

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

1442

strerror(errno));

870

1443

}

871

1444

errno = e;

872

1445

goto mandos_end;

873

1446

}

874

1447

written += (size_t)ret;

875

1448

}

1449

ret = fflush(stdout);

1450

if(ret != 0){

1451

int e = errno;

1452

if(debug){

1453

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

1454

strerror(errno));

1455

}

1456

errno = e;

1457

goto mandos_end;

1458

}

876

1459

retval = 0;

877

1460

}

878

1461

}

881

1464

882

1465

mandos_end:

883

1466

{

1467

if(route_added){

1468

if(not delete_local_route(ip, if_index)){

1469

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

1470

" interface %d", ip, if_index);

1471

}

1472

}

884

1473

int e = errno;

885

1474

free(decrypted_buffer);

886

1475

free(buffer);

887

1476

if(tcp_sd >= 0){

888

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

1477

ret = close(tcp_sd);

889

1478

}

890

1479

if(ret == -1){

891

1480

if(e == 0){

892

1481

e = errno;

893

1482

}

894

perror("close");

1483

perror_plus("close");

895

1484

}

896

1485

gnutls_deinit(session);

1486

errno = e;

897

1487

if(quit_now){

898

e = EINTR;

1488

errno = EINTR;

899

1489

retval = -1;

900

1490

}

901

errno = e;

902

1491

}

903

1492

return retval;

904

1493

}

905

1494

1495

__attribute__((nonnull))

906

1496

static void resolve_callback(AvahiSServiceResolver *r,

907

1497

AvahiIfIndex interface,

908

1498

AvahiProtocol proto,

916

1506

AVAHI_GCC_UNUSED AvahiStringList *txt,

917

1507

AVAHI_GCC_UNUSED AvahiLookupResultFlags

918

1508

flags,

919

AVAHI_GCC_UNUSED void* userdata){

920

assert(r);

1509

void *mc){

1510

if(r == NULL){

1511

return;

1512

}

921

1513

922

1514

/* Called whenever a service has been resolved successfully or

923

1515

timed out */

924

1516

925

1517

if(quit_now){

1518

avahi_s_service_resolver_free(r);

926

1519

return;

927

1520

}

928

1521

929

1522

switch(event){

930

1523

default:

931

1524

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)));

1525

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

1526

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

1527

domain,

1528

avahi_strerror(avahi_server_errno

1529

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

935

1530

break;

936

1531

937

1532

case AVAHI_RESOLVER_FOUND:

939

1534

char ip[AVAHI_ADDRESS_STR_MAX];

940

1535

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

941

1536

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);

1537

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

1538

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

1539

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

945

1540

}

946

int ret = start_mandos_communication(ip, port, interface,

947

avahi_proto_to_af(proto));

1541

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

1542

interface,

1543

avahi_proto_to_af(proto),

1544

mc);

948

1545

if(ret == 0){

949

avahi_simple_poll_quit(mc.simple_poll);

1546

avahi_simple_poll_quit(simple_poll);

1547

} else {

1548

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

1549

avahi_proto_to_af(proto),

1550

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

1551

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

1552

" list\n", name);

1553

}

950

1554

}

951

1555

}

952

1556

}

962

1566

const char *domain,

963

1567

AVAHI_GCC_UNUSED AvahiLookupResultFlags

964

1568

flags,

965

AVAHI_GCC_UNUSED void* userdata){

966

assert(b);

1569

void *mc){

1570

if(b == NULL){

1571

return;

1572

}

967

1573

968

1574

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

969

1575

is removed from the LAN */

976

1582

default:

977

1583

case AVAHI_BROWSER_FAILURE:

978

1584

979

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

980

avahi_strerror(avahi_server_errno(mc.server)));

981

avahi_simple_poll_quit(mc.simple_poll);

1585

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

1586

avahi_strerror(avahi_server_errno

1587

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

1588

avahi_simple_poll_quit(simple_poll);

982

1589

return;

983

1590

984

1591

case AVAHI_BROWSER_NEW:

987

1594

the callback function is called the Avahi server will free the

988

1595

resolver for us. */

989

1596

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)));

1597

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

1598

interface, protocol, name, type,

1599

domain, protocol, 0,

1600

resolve_callback, mc) == NULL)

1601

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

1602

" %s\n", name,

1603

avahi_strerror(avahi_server_errno

1604

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

995

1605

break;

996

1606

997

1607

case AVAHI_BROWSER_REMOVE:

1000

1610

case AVAHI_BROWSER_ALL_FOR_NOW:

1001

1611

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1002

1612

if(debug){

1003

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

1613

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

1614

" searching...\n");

1004

1615

}

1005

1616

break;

1006

1617

}

1007

1618

}

1008

1619

1009

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

1620

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

1010

1621

static void handle_sigterm(int sig){

1011

1622

if(quit_now){

1012

1623

return;

1014

1625

quit_now = 1;

1015

1626

signal_received = sig;

1016

1627

int old_errno = errno;

1017

if(mc.simple_poll != NULL){

1018

avahi_simple_poll_quit(mc.simple_poll);

1019

}

1020

errno = old_errno;

1628

/* set main loop to exit */

1629

if(simple_poll != NULL){

1630

avahi_simple_poll_quit(simple_poll);

1631

}

1632

errno = old_errno;

1633

}

1634

1635

__attribute__((nonnull, warn_unused_result))

1636

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

1637

int ret;

1638

int old_errno;

1639

1640

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

1641

if(s < 0){

1642

old_errno = errno;

1643

perror_plus("socket");

1644

errno = old_errno;

1645

return false;

1646

}

1647

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

1648

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

1649

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1650

if(ret == -1){

1651

if(debug){

1652

old_errno = errno;

1653

perror_plus("ioctl SIOCGIFFLAGS");

1654

errno = old_errno;

1655

}

1656

return false;

1657

}

1658

return true;

1659

}

1660

1661

__attribute__((nonnull, warn_unused_result))

1662

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

1663

1664

/* Reject the loopback device */

1665

if(ifr->ifr_flags & IFF_LOOPBACK){

1666

if(debug){

1667

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

1668

ifname);

1669

}

1670

return false;

1671

}

1672

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

1673

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

1674

if(debug){

1675

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

1676

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

1677

}

1678

return true;

1679

}

1680

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

1681

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

1682

if(debug){

1683

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1684

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

1685

}

1686

return false;

1687

}

1688

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

1689

if(ifr->ifr_flags & IFF_NOARP){

1690

if(debug){

1691

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

1692

ifname);

1693

}

1694

return false;

1695

}

1696

1697

/* Accept this device */

1698

if(debug){

1699

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

1700

}

1701

return true;

1702

}

1703

1704

/*

1705

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

1706

* corresponds to an acceptable network device.

1707

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

1708

*/

1709

__attribute__((nonnull, warn_unused_result))

1710

int good_interface(const struct dirent *if_entry){

1711

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

1712

return 0;

1713

}

1714

1715

struct ifreq ifr;

1716

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

1717

if(debug){

1718

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

1719

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

1720

}

1721

return 0;

1722

}

1723

1724

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

1725

return 0;

1726

}

1727

return 1;

1728

}

1729

1730

/*

1731

* This function determines if a network interface is up.

1732

*/

1733

__attribute__((nonnull, warn_unused_result))

1734

bool interface_is_up(const char *interface){

1735

struct ifreq ifr;

1736

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

1737

if(debug){

1738

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

1739

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

1740

}

1741

return false;

1742

}

1743

1744

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

1745

}

1746

1747

/*

1748

* This function determines if a network interface is running

1749

*/

1750

__attribute__((nonnull, warn_unused_result))

1751

bool interface_is_running(const char *interface){

1752

struct ifreq ifr;

1753

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

1754

if(debug){

1755

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

1756

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

1757

}

1758

return false;

1759

}

1760

1761

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

1762

}

1763

1764

__attribute__((nonnull, pure, warn_unused_result))

1765

int notdotentries(const struct dirent *direntry){

1766

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

1767

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

1768

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

1769

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

1770

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

1771

return 0;

1772

}

1773

return 1;

1774

}

1775

1776

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

1777

__attribute__((nonnull, warn_unused_result))

1778

int runnable_hook(const struct dirent *direntry){

1779

int ret;

1780

size_t sret;

1781

struct stat st;

1782

1783

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

1784

/* Empty name? */

1785

return 0;

1786

}

1787

1788

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

1789

"abcdefghijklmnopqrstuvwxyz"

1790

"0123456789"

1791

"_.-");

1792

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

1793

/* Contains non-allowed characters */

1794

if(debug){

1795

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

1796

direntry->d_name);

1797

}

1798

return 0;

1799

}

1800

1801

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

1802

if(ret == -1){

1803

if(debug){

1804

perror_plus("Could not stat hook");

1805

}

1806

return 0;

1807

}

1808

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

1809

/* Not a regular file */

1810

if(debug){

1811

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

1812

direntry->d_name);

1813

}

1814

return 0;

1815

}

1816

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

1817

/* Not executable */

1818

if(debug){

1819

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

1820

direntry->d_name);

1821

}

1822

return 0;

1823

}

1824

if(debug){

1825

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

1826

direntry->d_name);

1827

}

1828

return 1;

1829

}

1830

1831

__attribute__((nonnull, warn_unused_result))

1832

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1833

mandos_context *mc){

1834

int ret;

1835

struct timespec now;

1836

struct timespec waited_time;

1837

intmax_t block_time;

1838

1839

while(true){

1840

if(mc->current_server == NULL){

1841

if(debug){

1842

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

1843

" No timeout!\n");

1844

}

1845

ret = avahi_simple_poll_iterate(s, -1);

1846

} else {

1847

if(debug){

1848

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

1849

" it, or wait\n");

1850

}

1851

/* the current time */

1852

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1853

if(ret == -1){

1854

perror_plus("clock_gettime");

1855

return -1;

1856

}

1857

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

1858

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

1859

waited_time.tv_sec = (now.tv_sec

1860

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

1861

waited_time.tv_nsec = (now.tv_nsec

1862

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

1863

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

1864

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

1865

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

1866

block_time = ((retry_interval

1867

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

1868

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

1869

1870

if(debug){

1871

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

1872

block_time);

1873

}

1874

1875

if(block_time <= 0){

1876

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

1877

mc->current_server->port,

1878

mc->current_server->if_index,

1879

mc->current_server->af, mc);

1880

if(ret == 0){

1881

avahi_simple_poll_quit(s);

1882

return 0;

1883

}

1884

ret = clock_gettime(CLOCK_MONOTONIC,

1885

&mc->current_server->last_seen);

1886

if(ret == -1){

1887

perror_plus("clock_gettime");

1888

return -1;

1889

}

1890

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

1891

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

1892

servers, but don't block */

1893

}

1894

1895

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

1896

}

1897

if(ret != 0){

1898

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

1899

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

1900

}

1901

}

1902

}

1903

}

1904

1905

__attribute__((nonnull))

1906

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

1907

const float delay){

1908

struct dirent **direntries = NULL;

1909

if(hookdir_fd == -1){

1910

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1911

| O_CLOEXEC);

1912

if(hookdir_fd == -1){

1913

if(errno == ENOENT){

1914

if(debug){

1915

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

1916

" found\n", hookdir);

1917

}

1918

} else {

1919

perror_plus("open");

1920

}

1921

return;

1922

}

1923

}

1924

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

1925

runnable_hook, alphasort);

1926

if(numhooks == -1){

1927

perror_plus("scandir");

1928

return;

1929

}

1930

struct dirent *direntry;

1931

int ret;

1932

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

1933

if(devnull == -1){

1934

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

1935

return;

1936

}

1937

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

1938

direntry = direntries[i];

1939

if(debug){

1940

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

1941

direntry->d_name);

1942

}

1943

pid_t hook_pid = fork();

1944

if(hook_pid == 0){

1945

/* Child */

1946

/* Raise privileges */

1947

errno = raise_privileges_permanently();

1948

if(errno != 0){

1949

perror_plus("Failed to raise privileges");

1950

_exit(EX_NOPERM);

1951

}

1952

/* Set group */

1953

errno = 0;

1954

ret = setgid(0);

1955

if(ret == -1){

1956

perror_plus("setgid");

1957

_exit(EX_NOPERM);

1958

}

1959

/* Reset supplementary groups */

1960

errno = 0;

1961

ret = setgroups(0, NULL);

1962

if(ret == -1){

1963

perror_plus("setgroups");

1964

_exit(EX_NOPERM);

1965

}

1966

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

1967

if(ret == -1){

1968

perror_plus("setenv");

1969

_exit(EX_OSERR);

1970

}

1971

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

1972

if(ret == -1){

1973

perror_plus("setenv");

1974

_exit(EX_OSERR);

1975

}

1976

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

1977

if(ret == -1){

1978

perror_plus("setenv");

1979

_exit(EX_OSERR);

1980

}

1981

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

1982

if(ret == -1){

1983

perror_plus("setenv");

1984

_exit(EX_OSERR);

1985

}

1986

char *delaystring;

1987

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

1988

if(ret == -1){

1989

perror_plus("asprintf");

1990

_exit(EX_OSERR);

1991

}

1992

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

1993

if(ret == -1){

1994

free(delaystring);

1995

perror_plus("setenv");

1996

_exit(EX_OSERR);

1997

}

1998

free(delaystring);

1999

if(connect_to != NULL){

2000

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

2001

if(ret == -1){

2002

perror_plus("setenv");

2003

_exit(EX_OSERR);

2004

}

2005

}

2006

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

2007

direntry->d_name,

2008

O_RDONLY));

2009

if(hook_fd == -1){

2010

perror_plus("openat");

2011

_exit(EXIT_FAILURE);

2012

}

2013

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

2014

perror_plus("close");

2015

_exit(EXIT_FAILURE);

2016

}

2017

ret = dup2(devnull, STDIN_FILENO);

2018

if(ret == -1){

2019

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

2020

_exit(EX_OSERR);

2021

}

2022

ret = close(devnull);

2023

if(ret == -1){

2024

perror_plus("close");

2025

_exit(EX_OSERR);

2026

}

2027

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2028

if(ret == -1){

2029

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

2030

_exit(EX_OSERR);

2031

}

2032

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

2033

environ) == -1){

2034

perror_plus("fexecve");

2035

_exit(EXIT_FAILURE);

2036

}

2037

} else {

2038

if(hook_pid == -1){

2039

perror_plus("fork");

2040

free(direntry);

2041

continue;

2042

}

2043

int status;

2044

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

2045

perror_plus("waitpid");

2046

free(direntry);

2047

continue;

2048

}

2049

if(WIFEXITED(status)){

2050

if(WEXITSTATUS(status) != 0){

2051

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

2052

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

2053

WEXITSTATUS(status));

2054

free(direntry);

2055

continue;

2056

}

2057

} else if(WIFSIGNALED(status)){

2058

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

2059

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

2060

WTERMSIG(status));

2061

free(direntry);

2062

continue;

2063

} else {

2064

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

2065

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

2066

free(direntry);

2067

continue;

2068

}

2069

}

2070

if(debug){

2071

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

2072

direntry->d_name);

2073

}

2074

free(direntry);

2075

}

2076

free(direntries);

2077

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

2078

perror_plus("close");

2079

} else {

2080

hookdir_fd = -1;

2081

}

2082

close(devnull);

2083

}

2084

2085

__attribute__((nonnull, warn_unused_result))

2086

int bring_up_interface(const char *const interface,

2087

const float delay){

2088

int old_errno = errno;

2089

int ret;

2090

struct ifreq network;

2091

unsigned int if_index = if_nametoindex(interface);

2092

if(if_index == 0){

2093

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

2094

errno = old_errno;

2095

return ENXIO;

2096

}

2097

2098

if(quit_now){

2099

errno = old_errno;

2100

return EINTR;

2101

}

2102

2103

if(not interface_is_up(interface)){

2104

int ret_errno = 0;

2105

int ioctl_errno = 0;

2106

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

2107

ret_errno = errno;

2108

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

2109

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

2110

errno = old_errno;

2111

return ret_errno;

2112

}

2113

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

2114

2115

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

2116

if(sd == -1){

2117

ret_errno = errno;

2118

perror_plus("socket");

2119

errno = old_errno;

2120

return ret_errno;

2121

}

2122

2123

if(quit_now){

2124

ret = close(sd);

2125

if(ret == -1){

2126

perror_plus("close");

2127

}

2128

errno = old_errno;

2129

return EINTR;

2130

}

2131

2132

if(debug){

2133

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

2134

interface);

2135

}

2136

2137

/* Raise privileges */

2138

ret_errno = raise_privileges();

2139

if(ret_errno != 0){

2140

errno = ret_errno;

2141

perror_plus("Failed to raise privileges");

2142

}

2143

2144

#ifdef __linux__

2145

int ret_linux;

2146

bool restore_loglevel = false;

2147

if(ret_errno == 0){

2148

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2149

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

2150

ret_linux = klogctl(8, NULL, 5);

2151

if(ret_linux == -1){

2152

perror_plus("klogctl");

2153

} else {

2154

restore_loglevel = true;

2155

}

2156

}

2157

#endif /* __linux__ */

2158

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

2159

ioctl_errno = errno;

2160

#ifdef __linux__

2161

if(restore_loglevel){

2162

ret_linux = klogctl(7, NULL, 0);

2163

if(ret_linux == -1){

2164

perror_plus("klogctl");

2165

}

2166

}

2167

#endif /* __linux__ */

2168

2169

/* If raise_privileges() succeeded above */

2170

if(ret_errno == 0){

2171

/* Lower privileges */

2172

ret_errno = lower_privileges();

2173

if(ret_errno != 0){

2174

errno = ret_errno;

2175

perror_plus("Failed to lower privileges");

2176

}

2177

}

2178

2179

/* Close the socket */

2180

ret = close(sd);

2181

if(ret == -1){

2182

perror_plus("close");

2183

}

2184

2185

if(ret_setflags == -1){

2186

errno = ioctl_errno;

2187

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2188

errno = old_errno;

2189

return ioctl_errno;

2190

}

2191

} else if(debug){

2192

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

2193

interface);

2194

}

2195

2196

/* Sleep checking until interface is running.

2197

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

2198

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

2199

if(interface_is_running(interface)){

2200

break;

2201

}

2202

struct timespec sleeptime = { .tv_nsec = 250000000 };

2203

ret = nanosleep(&sleeptime, NULL);

2204

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

2205

perror_plus("nanosleep");

2206

}

2207

}

2208

2209

errno = old_errno;

2210

return 0;

2211

}

2212

2213

__attribute__((nonnull, warn_unused_result))

2214

int take_down_interface(const char *const interface){

2215

int old_errno = errno;

2216

struct ifreq network;

2217

unsigned int if_index = if_nametoindex(interface);

2218

if(if_index == 0){

2219

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

2220

errno = old_errno;

2221

return ENXIO;

2222

}

2223

if(interface_is_up(interface)){

2224

int ret_errno = 0;

2225

int ioctl_errno = 0;

2226

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

2227

ret_errno = errno;

2228

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

2229

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

2230

errno = old_errno;

2231

return ret_errno;

2232

}

2233

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

2234

2235

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

2236

if(sd == -1){

2237

ret_errno = errno;

2238

perror_plus("socket");

2239

errno = old_errno;

2240

return ret_errno;

2241

}

2242

2243

if(debug){

2244

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

2245

interface);

2246

}

2247

2248

/* Raise privileges */

2249

ret_errno = raise_privileges();

2250

if(ret_errno != 0){

2251

errno = ret_errno;

2252

perror_plus("Failed to raise privileges");

2253

}

2254

2255

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

2256

ioctl_errno = errno;

2257

2258

/* If raise_privileges() succeeded above */

2259

if(ret_errno == 0){

2260

/* Lower privileges */

2261

ret_errno = lower_privileges();

2262

if(ret_errno != 0){

2263

errno = ret_errno;

2264

perror_plus("Failed to lower privileges");

2265

}

2266

}

2267

2268

/* Close the socket */

2269

int ret = close(sd);

2270

if(ret == -1){

2271

perror_plus("close");

2272

}

2273

2274

if(ret_setflags == -1){

2275

errno = ioctl_errno;

2276

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2277

errno = old_errno;

2278

return ioctl_errno;

2279

}

2280

} else if(debug){

2281

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

2282

interface);

2283

}

2284

2285

errno = old_errno;

2286

return 0;

1021

2287

}

1022

2288

1023

2289

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

2290

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

2291

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

2292

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

2293

.current_server = NULL, .interfaces = NULL,

2294

.interfaces_size = 0 };

1024

2295

AvahiSServiceBrowser *sb = NULL;

1025

int error;

2296

error_t ret_errno;

1026

2297

int ret;

1027

2298

intmax_t tmpmax;

1028

2299

char *tmp;

1029

2300

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;

2301

char *interfaces_to_take_down = NULL;

2302

size_t interfaces_to_take_down_size = 0;

2303

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

2304

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

2305

char *tempdir = NULL;

1039

2306

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1040

2307

const char *seckey = PATHDIR "/" SECKEY;

1041

2308

const char *pubkey = PATHDIR "/" PUBKEY;

2309

const char *dh_params_file = NULL;

2310

char *interfaces_hooks = NULL;

1042

2311

1043

2312

bool gnutls_initialized = false;

1044

2313

bool gpgme_initialized = false;

1045

2314

float delay = 2.5f;

2315

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

2316

retrying the same server again */

1046

2317

1047

2318

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1048

2319

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1054

2325

errno = 0;

1055

2326

ret = setgid(gid);

1056

2327

if(ret == -1){

1057

perror("setgid");

2328

perror_plus("setgid");

1058

2329

}

1059

2330

1060

2331

/* Lower user privileges (temporarily) */

1061

2332

errno = 0;

1062

2333

ret = seteuid(uid);

1063

2334

if(ret == -1){

1064

perror("seteuid");

2335

perror_plus("seteuid");

1065

2336

}

1066

2337

1067

2338

if(quit_now){

1094

2365

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

1095

2366

" Diffie-Hellman key exchange",

1096

2367

.group = 2 },

2368

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

2369

.arg = "FILE",

2370

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

2371

" for the Diffie-Hellman key exchange",

2372

.group = 2 },

1097

2373

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

1098

2374

.arg = "STRING",

1099

2375

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

1102

2378

.arg = "SECONDS",

1103

2379

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

1104

2380

.group = 2 },

2381

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

2382

.arg = "SECONDS",

2383

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

2384

.group = 2 },

2385

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

2386

.arg = "DIR",

2387

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

2388

.group = 2 },

1105

2389

/*

1106

2390

* These reproduce what we would get without ARGP_NO_HELP

1107

2391

*/

1125

2409

connect_to = arg;

1126

2410

break;

1127

2411

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

1128

interface = arg;

2412

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

2413

arg, (int)',');

2414

if(ret_errno != 0){

2415

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

2416

}

1129

2417

break;

1130

2418

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

1131

2419

seckey = arg;

1142

2430

}

1143

2431

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

1144

2432

break;

2433

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

2434

dh_params_file = arg;

2435

break;

1145

2436

case 130: /* --priority */

1146

2437

mc.priority = arg;

1147

2438

break;

1151

2442

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

1152

2443

argp_error(state, "Bad delay");

1153

2444

}

2445

case 132: /* --retry */

2446

errno = 0;

2447

retry_interval = strtod(arg, &tmp);

2448

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

2449

or (retry_interval * 1000) > INT_MAX

2450

or retry_interval < 0){

2451

argp_error(state, "Bad retry interval");

2452

}

2453

break;

2454

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

2455

hookdir = arg;

1154

2456

break;

1155

2457

/*

1156

2458

* These reproduce what we would get without ARGP_NO_HELP

1163

2465

argp_state_help(state, state->out_stream,

1164

2466

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1165

2467

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

1166

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

2468

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

1167

2469

exit(argp_err_exit_status);

1168

2470

break;

1169

2471

default:

1176

2478

.args_doc = "",

1177

2479

.doc = "Mandos client -- Get and decrypt"

1178

2480

" passwords from a Mandos server" };

1179

ret = argp_parse(&argp, argc, argv,

1180

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1181

switch(ret){

2481

ret_errno = argp_parse(&argp, argc, argv,

2482

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2483

switch(ret_errno){

1182

2484

case 0:

1183

2485

break;

1184

2486

case ENOMEM:

1185

2487

default:

1186

errno = ret;

1187

perror("argp_parse");

2488

errno = ret_errno;

2489

perror_plus("argp_parse");

1188

2490

exitcode = EX_OSERR;

1189

2491

goto end;

1190

2492

case EINVAL:

1193

2495

}

1194

2496

}

1195

2497

2498

{

2499

/* Work around Debian bug #633582:

2500

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

2501

2502

/* Re-raise privileges */

2503

ret = raise_privileges();

2504

if(ret != 0){

2505

errno = ret;

2506

perror_plus("Failed to raise privileges");

2507

} else {

2508

struct stat st;

2509

2510

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

2511

int seckey_fd = open(seckey, O_RDONLY);

2512

if(seckey_fd == -1){

2513

perror_plus("open");

2514

} else {

2515

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

2516

if(ret == -1){

2517

perror_plus("fstat");

2518

} else {

2519

if(S_ISREG(st.st_mode)

2520

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

2521

ret = fchown(seckey_fd, uid, gid);

2522

if(ret == -1){

2523

perror_plus("fchown");

2524

}

2525

}

2526

}

2527

close(seckey_fd);

2528

}

2529

}

2530

2531

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

2532

int pubkey_fd = open(pubkey, O_RDONLY);

2533

if(pubkey_fd == -1){

2534

perror_plus("open");

2535

} else {

2536

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

2537

if(ret == -1){

2538

perror_plus("fstat");

2539

} else {

2540

if(S_ISREG(st.st_mode)

2541

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

2542

ret = fchown(pubkey_fd, uid, gid);

2543

if(ret == -1){

2544

perror_plus("fchown");

2545

}

2546

}

2547

}

2548

close(pubkey_fd);

2549

}

2550

}

2551

2552

if(dh_params_file != NULL

2553

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

2554

int dhparams_fd = open(dh_params_file, O_RDONLY);

2555

if(dhparams_fd == -1){

2556

perror_plus("open");

2557

} else {

2558

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

2559

if(ret == -1){

2560

perror_plus("fstat");

2561

} else {

2562

if(S_ISREG(st.st_mode)

2563

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

2564

ret = fchown(dhparams_fd, uid, gid);

2565

if(ret == -1){

2566

perror_plus("fchown");

2567

}

2568

}

2569

}

2570

close(dhparams_fd);

2571

}

2572

}

2573

2574

/* Lower privileges */

2575

ret = lower_privileges();

2576

if(ret != 0){

2577

errno = ret;

2578

perror_plus("Failed to lower privileges");

2579

}

2580

}

2581

}

2582

2583

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

2584

{

2585

char *interface = NULL;

2586

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

2587

interface))){

2588

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

2589

and if_nametoindex(interface) == 0){

2590

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

2591

fprintf_plus(stderr, "Not using nonexisting interface"

2592

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

2593

}

2594

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

2595

interface = NULL;

2596

}

2597

}

2598

}

2599

2600

/* Run network hooks */

2601

{

2602

if(mc.interfaces != NULL){

2603

interfaces_hooks = malloc(mc.interfaces_size);

2604

if(interfaces_hooks == NULL){

2605

perror_plus("malloc");

2606

goto end;

2607

}

2608

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

2609

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

2610

}

2611

run_network_hooks("start", interfaces_hooks != NULL ?

2612

interfaces_hooks : "", delay);

2613

}

2614

1196

2615

if(not debug){

1197

2616

avahi_set_log_function(empty_log);

1198

2617

}

1201

2620

from the signal handler */

1202

2621

/* Initialize the pseudo-RNG for Avahi */

1203

2622

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");

2623

simple_poll = avahi_simple_poll_new();

2624

if(simple_poll == NULL){

2625

fprintf_plus(stderr,

2626

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

1207

2627

exitcode = EX_UNAVAILABLE;

1208

2628

goto end;

1209

2629

}

1211

2631

sigemptyset(&sigterm_action.sa_mask);

1212

2632

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

1213

2633

if(ret == -1){

1214

perror("sigaddset");

2634

perror_plus("sigaddset");

1215

2635

exitcode = EX_OSERR;

1216

2636

goto end;

1217

2637

}

1218

2638

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

1219

2639

if(ret == -1){

1220

perror("sigaddset");

2640

perror_plus("sigaddset");

1221

2641

exitcode = EX_OSERR;

1222

2642

goto end;

1223

2643

}

1224

2644

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

1225

2645

if(ret == -1){

1226

perror("sigaddset");

2646

perror_plus("sigaddset");

1227

2647

exitcode = EX_OSERR;

1228

2648

goto end;

1229

2649

}

1233

2653

*/

1234

2654

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

1235

2655

if(ret == -1){

1236

perror("sigaction");

2656

perror_plus("sigaction");

1237

2657

return EX_OSERR;

1238

2658

}

1239

2659

if(old_sigterm_action.sa_handler != SIG_IGN){

1240

2660

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

1241

2661

if(ret == -1){

1242

perror("sigaction");

2662

perror_plus("sigaction");

1243

2663

exitcode = EX_OSERR;

1244

2664

goto end;

1245

2665

}

1246

2666

}

1247

2667

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

1248

2668

if(ret == -1){

1249

perror("sigaction");

2669

perror_plus("sigaction");

1250

2670

return EX_OSERR;

1251

2671

}

1252

2672

if(old_sigterm_action.sa_handler != SIG_IGN){

1253

2673

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

1254

2674

if(ret == -1){

1255

perror("sigaction");

2675

perror_plus("sigaction");

1256

2676

exitcode = EX_OSERR;

1257

2677

goto end;

1258

2678

}

1259

2679

}

1260

2680

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

1261

2681

if(ret == -1){

1262

perror("sigaction");

2682

perror_plus("sigaction");

1263

2683

return EX_OSERR;

1264

2684

}

1265

2685

if(old_sigterm_action.sa_handler != SIG_IGN){

1266

2686

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

1267

2687

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");

2688

perror_plus("sigaction");

2689

exitcode = EX_OSERR;

2690

goto end;

2691

}

2692

}

2693

2694

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

2695

if(mc.interfaces == NULL){

2696

struct dirent **direntries = NULL;

2697

/* Look for any good interfaces */

2698

ret = scandir(sys_class_net, &direntries, good_interface,

2699

alphasort);

2700

if(ret >= 1){

2701

/* Add all found interfaces to interfaces list */

2702

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

2703

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

2704

direntries[i]->d_name);

2705

if(ret_errno != 0){

2706

errno = ret_errno;

2707

perror_plus("argz_add");

2708

free(direntries[i]);

2709

continue;

2710

}

2711

if(debug){

2712

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

2713

direntries[i]->d_name);

2714

}

2715

free(direntries[i]);

2716

}

2717

free(direntries);

2718

} else {

2719

if(ret == 0){

2720

free(direntries);

2721

}

2722

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

2723

exitcode = EXIT_FAILURE;

2724

goto end;

2725

}

2726

}

2727

2728

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

2729

{

2730

char *interface = NULL;

2731

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

2732

interface))){

2733

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

2734

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

2735

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

2736

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

2737

interface);

2738

interface = NULL;

2739

while((interface = argz_next(mc.interfaces,

2740

mc.interfaces_size, interface))){

2741

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

2742

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

2743

interface);

2744

interface = NULL;

1359

2745

}

1360

2746

}

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

2747

break;

1378

2748

}

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

}

2749

bool interface_was_up = interface_is_up(interface);

2750

errno = bring_up_interface(interface, delay);

2751

if(not interface_was_up){

2752

if(errno != 0){

2753

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

2754

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

2755

} else {

2756

errno = argz_add(&interfaces_to_take_down,

2757

&interfaces_to_take_down_size,

2758

interface);

2759

if(errno != 0){

2760

perror_plus("argz_add");

2761

}

2762

}

2763

}

2764

}

2765

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

2766

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

2767

}

2768

}

2769

2770

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

2771

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

2772

if(debug){

2773

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

2774

mc.interfaces);

2775

}

2776

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

1416

2777

}

1417

2778

1418

2779

if(quit_now){

1419

2780

goto end;

1420

2781

}

1421

2782

1422

ret = init_gnutls_global(pubkey, seckey);

2783

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

1423

2784

if(ret == -1){

1424

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

2785

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

1425

2786

exitcode = EX_UNAVAILABLE;

1426

2787

goto end;

1427

2788

} else {

1432

2793

goto end;

1433

2794

}

1434

2795

1435

tempdir_created = true;

1436

if(mkdtemp(tempdir) == NULL){

1437

tempdir_created = false;

1438

perror("mkdtemp");

2796

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

2797

tempdir = mkdtemp(run_tempdir);

2798

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

2799

if(debug){

2800

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

2801

run_tempdir, old_tempdir);

2802

}

2803

tempdir = mkdtemp(old_tempdir);

2804

}

2805

if(tempdir == NULL){

2806

perror_plus("mkdtemp");

1439

2807

goto end;

1440

2808

}

1441

2809

1443

2811

goto end;

1444

2812

}

1445

2813

1446

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

1447

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

2814

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

2815

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

1448

2816

exitcode = EX_UNAVAILABLE;

1449

2817

goto end;

1450

2818

} else {

1459

2827

/* Connect directly, do not use Zeroconf */

1460

2828

/* (Mainly meant for debugging) */

1461

2829

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

2830

1462

2831

if(address == NULL){

1463

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

2832

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

1464

2833

exitcode = EX_USAGE;

1465

2834

goto end;

1466

2835

}

1469

2838

goto end;

1470

2839

}

1471

2840

1472

uint16_t port;

2841

in_port_t port;

1473

2842

errno = 0;

1474

2843

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

1475

2844

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

1476

or tmpmax != (uint16_t)tmpmax){

1477

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

2845

or tmpmax != (in_port_t)tmpmax){

2846

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

1478

2847

exitcode = EX_USAGE;

1479

2848

goto end;

1480

2849

}

1481

2850

1482

2851

if(quit_now){

1483

2852

goto end;

1484

2853

}

1485

2854

1486

port = (uint16_t)tmpmax;

2855

port = (in_port_t)tmpmax;

1487

2856

*address = '\0';

1488

address = connect_to;

1489

2857

/* Colon in address indicates IPv6 */

1490

2858

int af;

1491

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

2859

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

1492

2860

af = AF_INET6;

2861

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

2862

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

2863

{

2864

connect_to++;

2865

address[-1] = '\0';

2866

}

1493

2867

} else {

1494

2868

af = AF_INET;

1495

2869

}

2870

address = connect_to;

1496

2871

1497

2872

if(quit_now){

1498

2873

goto end;

1499

2874

}

1500

2875

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 {

2876

while(not quit_now){

2877

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

2878

&mc);

2879

if(quit_now or ret == 0){

2880

break;

2881

}

2882

if(debug){

2883

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

2884

(int)retry_interval);

2885

}

2886

sleep((unsigned int)retry_interval);

2887

}

2888

2889

if(not quit_now){

1523

2890

exitcode = EXIT_SUCCESS;

1524

2891

}

2892

1525

2893

goto end;

1526

2894

}

1527

2895

1539

2907

config.publish_domain = 0;

1540

2908

1541

2909

/* Allocate a new server */

1542

mc.server = avahi_server_new(avahi_simple_poll_get

1543

(mc.simple_poll), &config, NULL,

1544

NULL, &error);

2910

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2911

&config, NULL, NULL, &ret);

1545

2912

1546

2913

/* Free the Avahi configuration data */

1547

2914

avahi_server_config_free(&config);

1549

2916

1550

2917

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

1551

2918

if(mc.server == NULL){

1552

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

1553

avahi_strerror(error));

2919

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

2920

avahi_strerror(ret));

1554

2921

exitcode = EX_UNAVAILABLE;

1555

2922

goto end;

1556

2923

}

1562

2929

/* Create the Avahi service browser */

1563

2930

sb = avahi_s_service_browser_new(mc.server, if_index,

1564

2931

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1565

NULL, 0, browse_callback, NULL);

2932

NULL, 0, browse_callback,

2933

(void *)&mc);

1566

2934

if(sb == NULL){

1567

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

1568

avahi_strerror(avahi_server_errno(mc.server)));

2935

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

2936

avahi_strerror(avahi_server_errno(mc.server)));

1569

2937

exitcode = EX_UNAVAILABLE;

1570

2938

goto end;

1571

2939

}

1577

2945

/* Run the main loop */

1578

2946

1579

2947

if(debug){

1580

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

2948

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

1581

2949

}

1582

2950

1583

avahi_simple_poll_loop(mc.simple_poll);

2951

ret = avahi_loop_with_timeout(simple_poll,

2952

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

2953

if(debug){

2954

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

2955

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

2956

}

1584

2957

1585

2958

end:

1586

2959

1587

2960

if(debug){

1588

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

2961

if(signal_received){

2962

fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",

2963

argv[0], signal_received,

2964

strsignal(signal_received));

2965

} else {

2966

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

2967

}

1589

2968

}

1590

2969

1591

2970

/* Cleanup things */

2971

free(mc.interfaces);

2972

1592

2973

if(sb != NULL)

1593

2974

avahi_s_service_browser_free(sb);

1594

2975

1595

2976

if(mc.server != NULL)

1596

2977

avahi_server_free(mc.server);

1597

2978

1598

if(mc.simple_poll != NULL)

1599

avahi_simple_poll_free(mc.simple_poll);

2979

if(simple_poll != NULL)

2980

avahi_simple_poll_free(simple_poll);

1600

2981

1601

2982

if(gnutls_initialized){

1602

2983

gnutls_certificate_free_credentials(mc.cred);

1603

gnutls_global_deinit();

1604

2984

gnutls_dh_params_deinit(mc.dh_params);

1605

2985

}

1606

2986

1608

2988

gpgme_release(mc.ctx);

1609

2989

}

1610

2990

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");

1684

}

2991

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

2992

has seen */

2993

if(mc.current_server != NULL){

2994

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

2995

while(mc.current_server != NULL){

2996

server *next = mc.current_server->next;

2997

#ifdef __GNUC__

2998

#pragma GCC diagnostic push

2999

#pragma GCC diagnostic ignored "-Wcast-qual"

3000

#endif

3001

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

3002

#ifdef __GNUC__

3003

#pragma GCC diagnostic pop

3004

#endif

3005

free(mc.current_server);

3006

mc.current_server = next;

3007

}

3008

}

3009

3010

/* Re-raise privileges */

3011

{

3012

ret = raise_privileges();

3013

if(ret != 0){

3014

errno = ret;

3015

perror_plus("Failed to raise privileges");

3016

} else {

3017

3018

/* Run network hooks */

3019

run_network_hooks("stop", interfaces_hooks != NULL ?

3020

interfaces_hooks : "", delay);

3021

3022

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

3023

{

3024

char *interface = NULL;

3025

while((interface=argz_next(interfaces_to_take_down,

3026

interfaces_to_take_down_size,

3027

interface))){

3028

ret = take_down_interface(interface);

3029

if(ret != 0){

3030

errno = ret;

3031

perror_plus("Failed to take down interface");

3032

}

3033

}

3034

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

3035

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

3036

" down\n");

3037

}

3038

}

3039

}

3040

3041

ret = lower_privileges_permanently();

3042

if(ret != 0){

3043

errno = ret;

3044

perror_plus("Failed to lower privileges permanently");

3045

}

3046

}

3047

3048

free(interfaces_to_take_down);

3049

free(interfaces_hooks);

3050

3051

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

3052

uintmax_t level){

3053

struct dirent **direntries = NULL;

3054

int dret;

3055

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

3056

O_RDONLY

3057

| O_NOFOLLOW

3058

| O_DIRECTORY

3059

| O_PATH));

3060

if(dir_fd == -1){

3061

perror_plus("open");

3062

}

3063

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

3064

notdotentries, alphasort);

3065

if(numentries >= 0){

3066

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

3067

if(debug){

3068

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

3069

dirname, direntries[i]->d_name);

3070

}

3071

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

3072

if(dret == -1){

3073

if(errno == EISDIR){

3074

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

3075

AT_REMOVEDIR);

3076

}

3077

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

3078

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

3079

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

3080

/* Recurse only in this special case */

3081

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

3082

dret = 0;

3083

}

3084

if(dret == -1){

3085

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

3086

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

3087

}

3088

}

3089

free(direntries[i]);

3090

}

3091

3092

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

3093

free(direntries);

3094

if(numentries == -1){

3095

perror_plus("scandirat");

3096

}

3097

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3098

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

3099

perror_plus("rmdir");

3100

}

3101

} else {

3102

perror_plus("scandirat");

3103

}

3104

close(dir_fd);

3105

}

3106

3107

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

3108

if(tempdir != NULL){

3109

clean_dir_at(-1, tempdir, 0);

1685

3110

}

1686

3111

1687

3112

if(quit_now){

1691

3116

&old_sigterm_action,

1692

3117

NULL));

1693

3118

if(ret == -1){

1694

perror("sigaction");

3119

perror_plus("sigaction");

1695

3120

}

1696

3121

do {

1697

3122

ret = raise(signal_received);

1698

3123

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

1699

3124

if(ret != 0){

1700

perror("raise");

3125

perror_plus("raise");

1701

3126

abort();

1702

3127

}

1703

3128

TEMP_FAILURE_RETRY(pause());