/mandos/release : revision 237.7.454

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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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65

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>

110

/* 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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128

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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"

124

140

#define PUBKEY "pubkey.txt"

141

#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";

148

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*/

143

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;

148

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;

187

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, ...){

195

va_list ap;

196

va_start (ap, format);

197

198

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

199

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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205

* 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){

158

*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,

238

.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");

248

#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;

258

}

259

/* Special case of first server */

260

if(*current_server == NULL){

261

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 */

266

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

}

271

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))

278

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.

178

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;

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292

184

293

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

185

294

if(fd == -1){

186

perror("open");

295

perror_plus("open");

187

296

return false;

188

297

}

189

298

190

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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));

194

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",

200

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

free(params.data);

630

} while(false);

631

}

632

if(dhparamsfilename == NULL){

633

if(mc->dh_bits == 0){

634

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

635

/* Try to read the private key file */

636

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

637

do {

638

int secfile = open(seckeyfilename, O_RDONLY);

639

if(secfile == -1){

640

perror_plus("open");

641

break;

642

}

643

size_t buffer_capacity = 0;

644

while(true){

645

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

646

(size_t)buffer.size,

647

(size_t)buffer_capacity);

648

if(buffer_capacity == 0){

649

perror_plus("incbuffer");

650

free(buffer.data);

651

buffer.data = NULL;

652

break;

653

}

654

ssize_t bytes_read = read(secfile,

655

buffer.data + buffer.size,

656

BUFFER_SIZE);

657

/* EOF */

658

if(bytes_read == 0){

659

break;

660

}

661

/* check bytes_read for failure */

662

if(bytes_read < 0){

663

perror_plus("read");

664

free(buffer.data);

665

buffer.data = NULL;

666

break;

667

}

668

buffer.size += (unsigned int)bytes_read;

669

}

670

close(secfile);

671

} while(false);

672

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

673

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

674

if(buffer.data != NULL){

675

{

676

gnutls_openpgp_privkey_t privkey = NULL;

677

ret = gnutls_openpgp_privkey_init(&privkey);

678

if(ret != GNUTLS_E_SUCCESS){

679

fprintf_plus(stderr, "Error initializing OpenPGP key"

680

" structure: %s",

681

safer_gnutls_strerror(ret));

682

free(buffer.data);

683

buffer.data = NULL;

684

} else {

685

ret = gnutls_openpgp_privkey_import

686

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

687

if(ret != GNUTLS_E_SUCCESS){

688

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

689

safer_gnutls_strerror(ret));

690

privkey = NULL;

691

}

692

free(buffer.data);

693

buffer.data = NULL;

694

if(privkey != NULL){

695

/* Use private key to suggest an appropriate

696

sec_param */

697

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

698

gnutls_openpgp_privkey_deinit(privkey);

699

if(debug){

700

fprintf_plus(stderr, "This OpenPGP key implies using"

701

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

702

safe_string(gnutls_sec_param_get_name

703

(sec_param)));

704

}

705

}

706

}

707

}

708

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

709

/* Err on the side of caution */

710

sec_param = GNUTLS_SEC_PARAM_ULTRA;

711

if(debug){

712

fprintf_plus(stderr, "Falling back to security parameter"

713

" \"%s\"\n",

714

safe_string(gnutls_sec_param_get_name

715

(sec_param)));

716

}

717

}

718

}

719

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

720

if(uret != 0){

721

mc->dh_bits = uret;

722

if(debug){

723

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

724

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

725

safe_string(gnutls_sec_param_get_name

726

(sec_param)),

727

mc->dh_bits);

728

}

729

} else {

730

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

731

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

732

safe_string(gnutls_sec_param_get_name

733

(sec_param)),

734

safer_gnutls_strerror(ret));

735

goto globalfail;

736

}

737

} else if(debug){

738

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

739

mc->dh_bits);

740

}

741

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

742

if(ret != GNUTLS_E_SUCCESS){

743

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

744

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

745

safer_gnutls_strerror(ret));

746

goto globalfail;

747

}

748

}

749

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

468

750

469

751

return 0;

470

752

471

753

globalfail:

472

754

473

gnutls_certificate_free_credentials(mc.cred);

474

gnutls_global_deinit();

475

gnutls_dh_params_deinit(mc.dh_params);

755

gnutls_certificate_free_credentials(mc->cred);

756

gnutls_dh_params_deinit(mc->dh_params);

476

757

return -1;

477

758

}

478

759

479

static int init_gnutls_session(gnutls_session_t *session){

760

__attribute__((nonnull, warn_unused_result))

761

static int init_gnutls_session(gnutls_session_t *session,

762

mandos_context *mc){

480

763

int ret;

481

764

/* GnuTLS session creation */

482

765

do {

486

769

}

487

770

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

488

771

if(ret != GNUTLS_E_SUCCESS){

489

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

490

safer_gnutls_strerror(ret));

772

fprintf_plus(stderr,

773

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

774

safer_gnutls_strerror(ret));

491

775

}

492

776

493

777

{

494

778

const char *err;

495

779

do {

496

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

780

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

497

781

if(quit_now){

498

782

gnutls_deinit(*session);

499

783

return -1;

500

784

}

501

785

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

502

786

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));

787

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

788

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

789

safer_gnutls_strerror(ret));

506

790

gnutls_deinit(*session);

507

791

return -1;

508

792

}

510

794

511

795

do {

512

796

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

513

mc.cred);

797

mc->cred);

514

798

if(quit_now){

515

799

gnutls_deinit(*session);

516

800

return -1;

517

801

}

518

802

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

519

803

if(ret != GNUTLS_E_SUCCESS){

520

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

521

safer_gnutls_strerror(ret));

804

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

805

safer_gnutls_strerror(ret));

522

806

gnutls_deinit(*session);

523

807

return -1;

524

808

}

526

810

/* ignore client certificate if any. */

527

811

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

528

812

529

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

530

531

813

return 0;

532

814

}

533

815

535

817

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

536

818

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

537

819

820

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

821

__attribute__((warn_unused_result))

822

int raise_privileges(void){

823

int old_errno = errno;

824

int ret = 0;

825

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

826

ret = errno;

827

}

828

errno = old_errno;

829

return ret;

830

}

831

832

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

833

__attribute__((warn_unused_result))

834

int raise_privileges_permanently(void){

835

int old_errno = errno;

836

int ret = raise_privileges();

837

if(ret != 0){

838

errno = old_errno;

839

return ret;

840

}

841

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

842

ret = errno;

843

}

844

errno = old_errno;

845

return ret;

846

}

847

848

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

849

__attribute__((warn_unused_result))

850

int lower_privileges(void){

851

int old_errno = errno;

852

int ret = 0;

853

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

854

ret = errno;

855

}

856

errno = old_errno;

857

return ret;

858

}

859

860

/* Lower privileges permanently */

861

__attribute__((warn_unused_result))

862

int lower_privileges_permanently(void){

863

int old_errno = errno;

864

int ret = 0;

865

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

866

ret = errno;

867

}

868

errno = old_errno;

869

return ret;

870

}

871

872

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

873

__attribute__((nonnull, warn_unused_result))

874

static bool add_delete_local_route(const bool add,

875

const char *address,

876

AvahiIfIndex if_index){

877

int ret;

878

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

879

char add_arg[] = "add";

880

char delete_arg[] = "delete";

881

char debug_flag[] = "--debug";

882

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

883

if(pluginhelperdir == NULL){

884

if(debug){

885

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

886

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

887

}

888

return false;

889

}

890

891

char interface[IF_NAMESIZE];

892

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

893

perror_plus("if_indextoname");

894

return false;

895

}

896

897

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

898

if(devnull == -1){

899

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

900

return false;

901

}

902

pid_t pid = fork();

903

if(pid == 0){

904

/* Child */

905

/* Raise privileges */

906

errno = raise_privileges_permanently();

907

if(errno != 0){

908

perror_plus("Failed to raise privileges");

909

/* _exit(EX_NOPERM); */

910

} else {

911

/* Set group */

912

errno = 0;

913

ret = setgid(0);

914

if(ret == -1){

915

perror_plus("setgid");

916

_exit(EX_NOPERM);

917

}

918

/* Reset supplementary groups */

919

errno = 0;

920

ret = setgroups(0, NULL);

921

if(ret == -1){

922

perror_plus("setgroups");

923

_exit(EX_NOPERM);

924

}

925

}

926

ret = dup2(devnull, STDIN_FILENO);

927

if(ret == -1){

928

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

929

_exit(EX_OSERR);

930

}

931

ret = close(devnull);

932

if(ret == -1){

933

perror_plus("close");

934

_exit(EX_OSERR);

935

}

936

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

937

if(ret == -1){

938

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

939

_exit(EX_OSERR);

940

}

941

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

942

O_RDONLY

943

| O_DIRECTORY

944

| O_PATH

945

| O_CLOEXEC));

946

if(helperdir_fd == -1){

947

perror_plus("open");

948

_exit(EX_UNAVAILABLE);

949

}

950

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

951

helper, O_RDONLY));

952

if(helper_fd == -1){

953

perror_plus("openat");

954

close(helperdir_fd);

955

_exit(EX_UNAVAILABLE);

956

}

957

close(helperdir_fd);

958

#ifdef __GNUC__

959

#pragma GCC diagnostic push

960

#pragma GCC diagnostic ignored "-Wcast-qual"

961

#endif

962

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

963

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

964

interface, debug ? debug_flag : NULL, NULL },

965

environ) == -1){

966

#ifdef __GNUC__

967

#pragma GCC diagnostic pop

968

#endif

969

perror_plus("fexecve");

970

_exit(EXIT_FAILURE);

971

}

972

}

973

if(pid == -1){

974

perror_plus("fork");

975

return false;

976

}

977

int status;

978

pid_t pret = -1;

979

errno = 0;

980

do {

981

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

982

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

983

int errno_raising = 0;

984

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

985

errno_raising = errno;

986

perror_plus("Failed to raise privileges in order to"

987

" kill helper program");

988

}

989

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

990

perror_plus("kill");

991

}

992

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

993

perror_plus("Failed to lower privileges after killing"

994

" helper program");

995

}

996

return false;

997

}

998

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

999

if(pret == -1){

1000

perror_plus("waitpid");

1001

return false;

1002

}

1003

if(WIFEXITED(status)){

1004

if(WEXITSTATUS(status) != 0){

1005

fprintf_plus(stderr, "Error: iprouteadddel exited"

1006

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

1007

return false;

1008

}

1009

return true;

1010

}

1011

if(WIFSIGNALED(status)){

1012

fprintf_plus(stderr, "Error: iprouteadddel died by"

1013

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

1014

return false;

1015

}

1016

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

1017

return false;

1018

}

1019

1020

__attribute__((nonnull, warn_unused_result))

1021

static bool add_local_route(const char *address,

1022

AvahiIfIndex if_index){

1023

if(debug){

1024

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

1025

}

1026

return add_delete_local_route(true, address, if_index);

1027

}

1028

1029

__attribute__((nonnull, warn_unused_result))

1030

static bool delete_local_route(const char *address,

1031

AvahiIfIndex if_index){

1032

if(debug){

1033

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

1034

}

1035

return add_delete_local_route(false, address, if_index);

1036

}

1037

538

1038

/* Called when a Mandos server is found */

539

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

1039

__attribute__((nonnull, warn_unused_result))

1040

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

540

1041

AvahiIfIndex if_index,

541

int af){

1042

int af, mandos_context *mc){

542

1043

int ret, tcp_sd = -1;

543

1044

ssize_t sret;

544

union {

545

struct sockaddr_in in;

546

struct sockaddr_in6 in6;

547

} to;

1045

struct sockaddr_storage to;

548

1046

char *buffer = NULL;

549

1047

char *decrypted_buffer = NULL;

550

1048

size_t buffer_length = 0;

553

1051

int retval = -1;

554

1052

gnutls_session_t session;

555

1053

int pf; /* Protocol family */

1054

bool route_added = false;

556

1055

557

1056

errno = 0;

558

1057

569

1068

pf = PF_INET;

570

1069

break;

571

1070

default:

572

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

1071

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

573

1072

errno = EINVAL;

574

1073

return -1;

575

1074

}

576

1075

577

ret = init_gnutls_session(&session);

1076

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

1077

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

1078

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

1079

bool match = false;

1080

{

1081

char *interface = NULL;

1082

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

1083

mc->interfaces_size,

1084

interface))){

1085

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

1086

match = true;

1087

break;

1088

}

1089

}

1090

}

1091

if(not match){

1092

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

1093

connect to the server */

1094

if(debug){

1095

char interface[IF_NAMESIZE];

1096

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

1097

perror_plus("if_indextoname");

1098

} else {

1099

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

1100

" \"%s\"\n",

1101

if_indextoname((unsigned int)if_index,

1102

interface));

1103

}

1104

}

1105

return -1;

1106

}

1107

}

1108

1109

ret = init_gnutls_session(&session, mc);

578

1110

if(ret != 0){

579

1111

return -1;

580

1112

}

581

1113

582

1114

if(debug){

583

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

584

"\n", ip, port);

1115

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

1116

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

585

1117

}

586

1118

587

tcp_sd = socket(pf, SOCK_STREAM, 0);

1119

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

588

1120

if(tcp_sd < 0){

589

1121

int e = errno;

590

perror("socket");

1122

perror_plus("socket");

591

1123

errno = e;

592

1124

goto mandos_end;

593

1125

}

597

1129

goto mandos_end;

598

1130

}

599

1131

600

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

601

1132

if(af == AF_INET6){

602

to.in6.sin6_family = (sa_family_t)af;

603

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

1133

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

1134

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

1135

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

604

1136

} else { /* IPv4 */

605

to.in.sin_family = (sa_family_t)af;

606

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

1137

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

1138

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

1139

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

607

1140

}

608

1141

if(ret < 0 ){

609

1142

int e = errno;

610

perror("inet_pton");

1143

perror_plus("inet_pton");

611

1144

errno = e;

612

1145

goto mandos_end;

613

1146

}

614

1147

if(ret == 0){

615

1148

int e = errno;

616

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

1149

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

617

1150

errno = e;

618

1151

goto mandos_end;

619

1152

}

620

1153

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*/

1154

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

1155

if(IN6_IS_ADDR_LINKLOCAL

1156

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

628

1157

if(if_index == AVAHI_IF_UNSPEC){

629

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

630

" without a network interface\n");

1158

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

1159

" incomplete without a network interface\n");

631

1160

errno = EINVAL;

632

1161

goto mandos_end;

633

1162

}

634

1163

/* Set the network interface number as scope */

635

to.in6.sin6_scope_id = (uint32_t)if_index;

1164

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

636

1165

}

637

1166

} else {

638

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

639

-Wconversion and

640

-Wunreachable-code */

1167

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

641

1168

}

642

1169

643

1170

if(quit_now){

649

1176

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

650

1177

char interface[IF_NAMESIZE];

651

1178

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

652

perror("if_indextoname");

1179

perror_plus("if_indextoname");

653

1180

} else {

654

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

655

ip, interface, port);

1181

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

1182

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

656

1183

}

657

1184

} else {

658

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

659

port);

1185

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

1186

ip, (uintmax_t)port);

660

1187

}

661

1188

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

662

1189

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;

1190

if(af == AF_INET6){

1191

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

1192

sizeof(struct sockaddr_in6),

1193

addrstr, sizeof(addrstr), NULL, 0,

1194

NI_NUMERICHOST);

1195

} else {

1196

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

1197

sizeof(struct sockaddr_in),

1198

addrstr, sizeof(addrstr), NULL, 0,

1199

NI_NUMERICHOST);

1200

}

1201

if(ret == EAI_SYSTEM){

1202

perror_plus("getnameinfo");

1203

} else if(ret != 0) {

1204

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

1205

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

1206

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

1207

}

1208

}

1209

1210

if(quit_now){

1211

errno = EINTR;

1212

goto mandos_end;

1213

}

1214

1215

while(true){

1216

if(af == AF_INET6){

1217

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

1218

sizeof(struct sockaddr_in6));

1219

} else {

1220

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

1221

sizeof(struct sockaddr_in));

1222

}

1223

if(ret < 0){

1224

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

1225

and if_index != AVAHI_IF_UNSPEC

1226

and connect_to == NULL

1227

and not route_added and

1228

((af == AF_INET6 and not

1229

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1230

&to)->sin6_addr)))

1231

or (af == AF_INET and

1232

/* Not a a IPv4LL address */

1233

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

1234

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

1235

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

1236

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

1237

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

1238

connect to a Mandos server announced by Avahi on a server

1239

host with a global address. Work around this by retrying

1240

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

1241

1242

Avahi bug reference:

1243

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

1244

https://bugs.debian.org/587961

1245

*/

1246

if(debug){

1247

fprintf_plus(stderr, "Mandos server unreachable, trying"

1248

" direct route\n");

1249

}

1250

int e = errno;

1251

route_added = add_local_route(ip, if_index);

1252

if(route_added){

1253

continue;

1254

}

1255

errno = e;

1256

}

1257

if(errno != ECONNREFUSED or debug){

1258

int e = errno;

1259

perror_plus("connect");

1260

errno = e;

1261

}

1262

goto mandos_end;

1263

}

1264

1265

if(quit_now){

1266

errno = EINTR;

1267

goto mandos_end;

1268

}

1269

break;

700

1270

}

701

1271

702

1272

const char *out = mandos_protocol_version;

704

1274

while(true){

705

1275

size_t out_size = strlen(out);

706

1276

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

707

out_size - written));

1277

out_size - written));

708

1278

if(ret == -1){

709

1279

int e = errno;

710

perror("write");

1280

perror_plus("write");

711

1281

errno = e;

712

1282

goto mandos_end;

713

1283

}

730

1300

}

731

1301

732

1302

if(debug){

733

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

1303

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

734

1304

}

735

1305

736

1306

if(quit_now){

738

1308

goto mandos_end;

739

1309

}

740

1310

741

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

1311

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

1312

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

1313

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

1314

gnutls_transport_set_ptr(session,

1315

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

742

1316

743

1317

if(quit_now){

744

1318

errno = EINTR;

755

1329

756

1330

if(ret != GNUTLS_E_SUCCESS){

757

1331

if(debug){

758

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

1332

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

759

1333

gnutls_perror(ret);

760

1334

}

761

1335

errno = EPROTO;

765

1339

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

766

1340

767

1341

if(debug){

768

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

769

ip);

1342

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

1343

" %s\n", ip);

770

1344

}

771

1345

772

1346

while(true){

777

1351

}

778

1352

779

1353

buffer_capacity = incbuffer(&buffer, buffer_length,

780

buffer_capacity);

1354

buffer_capacity);

781

1355

if(buffer_capacity == 0){

782

1356

int e = errno;

783

perror("incbuffer");

1357

perror_plus("incbuffer");

784

1358

errno = e;

785

1359

goto mandos_end;

786

1360

}

810

1384

}

811

1385

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

812

1386

if(ret < 0){

813

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

1387

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

1388

"***\n");

814

1389

gnutls_perror(ret);

815

1390

errno = EPROTO;

816

1391

goto mandos_end;

817

1392

}

818

1393

break;

819

1394

default:

820

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

821

" encrypted session with Mandos server\n");

1395

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

1396

" encrypted session with Mandos server\n");

822

1397

gnutls_bye(session, GNUTLS_SHUT_RDWR);

823

1398

errno = EIO;

824

1399

goto mandos_end;

829

1404

}

830

1405

831

1406

if(debug){

832

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

1407

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

833

1408

}

834

1409

835

1410

if(quit_now){

847

1422

848

1423

if(buffer_length > 0){

849

1424

ssize_t decrypted_buffer_size;

850

decrypted_buffer_size = pgp_packet_decrypt(buffer,

851

buffer_length,

852

&decrypted_buffer);

1425

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

1426

&decrypted_buffer, mc);

853

1427

if(decrypted_buffer_size >= 0){

854

1428

1429

clearerr(stdout);

855

1430

written = 0;

856

1431

while(written < (size_t) decrypted_buffer_size){

857

1432

if(quit_now){

865

1440

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

866

1441

int e = errno;

867

1442

if(debug){

868

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

869

strerror(errno));

1443

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

1444

strerror(errno));

870

1445

}

871

1446

errno = e;

872

1447

goto mandos_end;

873

1448

}

874

1449

written += (size_t)ret;

875

1450

}

1451

ret = fflush(stdout);

1452

if(ret != 0){

1453

int e = errno;

1454

if(debug){

1455

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

1456

strerror(errno));

1457

}

1458

errno = e;

1459

goto mandos_end;

1460

}

876

1461

retval = 0;

877

1462

}

878

1463

}

881

1466

882

1467

mandos_end:

883

1468

{

1469

if(route_added){

1470

if(not delete_local_route(ip, if_index)){

1471

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

1472

" interface %d", ip, if_index);

1473

}

1474

}

884

1475

int e = errno;

885

1476

free(decrypted_buffer);

886

1477

free(buffer);

887

1478

if(tcp_sd >= 0){

888

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

1479

ret = close(tcp_sd);

889

1480

}

890

1481

if(ret == -1){

891

1482

if(e == 0){

892

1483

e = errno;

893

1484

}

894

perror("close");

1485

perror_plus("close");

895

1486

}

896

1487

gnutls_deinit(session);

1488

errno = e;

897

1489

if(quit_now){

898

e = EINTR;

1490

errno = EINTR;

899

1491

retval = -1;

900

1492

}

901

errno = e;

902

1493

}

903

1494

return retval;

904

1495

}

916

1507

AVAHI_GCC_UNUSED AvahiStringList *txt,

917

1508

AVAHI_GCC_UNUSED AvahiLookupResultFlags

918

1509

flags,

919

AVAHI_GCC_UNUSED void* userdata){

920

assert(r);

1510

void *mc){

1511

if(r == NULL){

1512

return;

1513

}

921

1514

922

1515

/* Called whenever a service has been resolved successfully or

923

1516

timed out */

924

1517

925

1518

if(quit_now){

1519

avahi_s_service_resolver_free(r);

926

1520

return;

927

1521

}

928

1522

929

1523

switch(event){

930

1524

default:

931

1525

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)));

1526

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

1527

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

1528

domain,

1529

avahi_strerror(avahi_server_errno

1530

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

935

1531

break;

936

1532

937

1533

case AVAHI_RESOLVER_FOUND:

939

1535

char ip[AVAHI_ADDRESS_STR_MAX];

940

1536

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

941

1537

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);

1538

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

1539

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

1540

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

945

1541

}

946

int ret = start_mandos_communication(ip, port, interface,

947

avahi_proto_to_af(proto));

1542

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

1543

interface,

1544

avahi_proto_to_af(proto),

1545

mc);

948

1546

if(ret == 0){

949

avahi_simple_poll_quit(mc.simple_poll);

1547

avahi_simple_poll_quit(simple_poll);

1548

} else {

1549

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

1550

avahi_proto_to_af(proto),

1551

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

1552

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

1553

" list\n", name);

1554

}

950

1555

}

951

1556

}

952

1557

}

962

1567

const char *domain,

963

1568

AVAHI_GCC_UNUSED AvahiLookupResultFlags

964

1569

flags,

965

AVAHI_GCC_UNUSED void* userdata){

966

assert(b);

1570

void *mc){

1571

if(b == NULL){

1572

return;

1573

}

967

1574

968

1575

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

969

1576

is removed from the LAN */

976

1583

default:

977

1584

case AVAHI_BROWSER_FAILURE:

978

1585

979

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

980

avahi_strerror(avahi_server_errno(mc.server)));

981

avahi_simple_poll_quit(mc.simple_poll);

1586

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

1587

avahi_strerror(avahi_server_errno

1588

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

1589

avahi_simple_poll_quit(simple_poll);

982

1590

return;

983

1591

984

1592

case AVAHI_BROWSER_NEW:

987

1595

the callback function is called the Avahi server will free the

988

1596

resolver for us. */

989

1597

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)));

1598

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

1599

interface, protocol, name, type,

1600

domain, protocol, 0,

1601

resolve_callback, mc) == NULL)

1602

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

1603

" %s\n", name,

1604

avahi_strerror(avahi_server_errno

1605

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

995

1606

break;

996

1607

997

1608

case AVAHI_BROWSER_REMOVE:

1000

1611

case AVAHI_BROWSER_ALL_FOR_NOW:

1001

1612

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1002

1613

if(debug){

1003

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

1614

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

1615

" searching...\n");

1004

1616

}

1005

1617

break;

1006

1618

}

1007

1619

}

1008

1620

1009

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

1621

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

1010

1622

static void handle_sigterm(int sig){

1011

1623

if(quit_now){

1012

1624

return;

1014

1626

quit_now = 1;

1015

1627

signal_received = sig;

1016

1628

int old_errno = errno;

1017

if(mc.simple_poll != NULL){

1018

avahi_simple_poll_quit(mc.simple_poll);

1019

}

1020

errno = old_errno;

1629

/* set main loop to exit */

1630

if(simple_poll != NULL){

1631

avahi_simple_poll_quit(simple_poll);

1632

}

1633

errno = old_errno;

1634

}

1635

1636

__attribute__((nonnull, warn_unused_result))

1637

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

1638

int ret;

1639

int old_errno;

1640

1641

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

1642

if(s < 0){

1643

old_errno = errno;

1644

perror_plus("socket");

1645

errno = old_errno;

1646

return false;

1647

}

1648

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

1649

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

1650

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1651

if(ret == -1){

1652

if(debug){

1653

old_errno = errno;

1654

perror_plus("ioctl SIOCGIFFLAGS");

1655

errno = old_errno;

1656

}

1657

return false;

1658

}

1659

return true;

1660

}

1661

1662

__attribute__((nonnull, warn_unused_result))

1663

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

1664

1665

/* Reject the loopback device */

1666

if(ifr->ifr_flags & IFF_LOOPBACK){

1667

if(debug){

1668

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

1669

ifname);

1670

}

1671

return false;

1672

}

1673

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

1674

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

1675

if(debug){

1676

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

1677

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

1678

}

1679

return true;

1680

}

1681

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

1682

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

1683

if(debug){

1684

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1685

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

1686

}

1687

return false;

1688

}

1689

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

1690

if(ifr->ifr_flags & IFF_NOARP){

1691

if(debug){

1692

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

1693

ifname);

1694

}

1695

return false;

1696

}

1697

1698

/* Accept this device */

1699

if(debug){

1700

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

1701

}

1702

return true;

1703

}

1704

1705

/*

1706

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

1707

* corresponds to an acceptable network device.

1708

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

1709

*/

1710

__attribute__((nonnull, warn_unused_result))

1711

int good_interface(const struct dirent *if_entry){

1712

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

1713

return 0;

1714

}

1715

1716

struct ifreq ifr;

1717

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

1718

if(debug){

1719

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

1720

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

1721

}

1722

return 0;

1723

}

1724

1725

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

1726

return 0;

1727

}

1728

return 1;

1729

}

1730

1731

/*

1732

* This function determines if a network interface is up.

1733

*/

1734

__attribute__((nonnull, warn_unused_result))

1735

bool interface_is_up(const char *interface){

1736

struct ifreq ifr;

1737

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

1738

if(debug){

1739

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

1740

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

1741

}

1742

return false;

1743

}

1744

1745

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

1746

}

1747

1748

/*

1749

* This function determines if a network interface is running

1750

*/

1751

__attribute__((nonnull, warn_unused_result))

1752

bool interface_is_running(const char *interface){

1753

struct ifreq ifr;

1754

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

1755

if(debug){

1756

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

1757

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

1758

}

1759

return false;

1760

}

1761

1762

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

1763

}

1764

1765

__attribute__((nonnull, pure, warn_unused_result))

1766

int notdotentries(const struct dirent *direntry){

1767

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

1768

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

1769

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

1770

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

1771

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

1772

return 0;

1773

}

1774

return 1;

1775

}

1776

1777

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

1778

__attribute__((nonnull, warn_unused_result))

1779

int runnable_hook(const struct dirent *direntry){

1780

int ret;

1781

size_t sret;

1782

struct stat st;

1783

1784

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

1785

/* Empty name? */

1786

return 0;

1787

}

1788

1789

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

1790

"abcdefghijklmnopqrstuvwxyz"

1791

"0123456789"

1792

"_.-");

1793

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

1794

/* Contains non-allowed characters */

1795

if(debug){

1796

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

1797

direntry->d_name);

1798

}

1799

return 0;

1800

}

1801

1802

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

1803

if(ret == -1){

1804

if(debug){

1805

perror_plus("Could not stat hook");

1806

}

1807

return 0;

1808

}

1809

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

1810

/* Not a regular file */

1811

if(debug){

1812

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

1813

direntry->d_name);

1814

}

1815

return 0;

1816

}

1817

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

1818

/* Not executable */

1819

if(debug){

1820

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

1821

direntry->d_name);

1822

}

1823

return 0;

1824

}

1825

if(debug){

1826

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

1827

direntry->d_name);

1828

}

1829

return 1;

1830

}

1831

1832

__attribute__((nonnull, warn_unused_result))

1833

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1834

mandos_context *mc){

1835

int ret;

1836

struct timespec now;

1837

struct timespec waited_time;

1838

intmax_t block_time;

1839

1840

while(true){

1841

if(mc->current_server == NULL){

1842

if(debug){

1843

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

1844

" No timeout!\n");

1845

}

1846

ret = avahi_simple_poll_iterate(s, -1);

1847

} else {

1848

if(debug){

1849

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

1850

" it, or wait\n");

1851

}

1852

/* the current time */

1853

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1854

if(ret == -1){

1855

perror_plus("clock_gettime");

1856

return -1;

1857

}

1858

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

1859

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

1860

waited_time.tv_sec = (now.tv_sec

1861

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

1862

waited_time.tv_nsec = (now.tv_nsec

1863

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

1864

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

1865

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

1866

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

1867

block_time = ((retry_interval

1868

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

1869

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

1870

1871

if(debug){

1872

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

1873

block_time);

1874

}

1875

1876

if(block_time <= 0){

1877

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

1878

mc->current_server->port,

1879

mc->current_server->if_index,

1880

mc->current_server->af, mc);

1881

if(ret == 0){

1882

avahi_simple_poll_quit(s);

1883

return 0;

1884

}

1885

ret = clock_gettime(CLOCK_MONOTONIC,

1886

&mc->current_server->last_seen);

1887

if(ret == -1){

1888

perror_plus("clock_gettime");

1889

return -1;

1890

}

1891

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

1892

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

1893

servers, but don't block */

1894

}

1895

1896

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

1897

}

1898

if(ret != 0){

1899

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

1900

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

1901

}

1902

}

1903

}

1904

}

1905

1906

__attribute__((nonnull))

1907

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

1908

const float delay){

1909

struct dirent **direntries = NULL;

1910

if(hookdir_fd == -1){

1911

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1912

| O_CLOEXEC);

1913

if(hookdir_fd == -1){

1914

if(errno == ENOENT){

1915

if(debug){

1916

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

1917

" found\n", hookdir);

1918

}

1919

} else {

1920

perror_plus("open");

1921

}

1922

return;

1923

}

1924

}

1925

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

1926

runnable_hook, alphasort);

1927

if(numhooks == -1){

1928

perror_plus("scandir");

1929

return;

1930

}

1931

struct dirent *direntry;

1932

int ret;

1933

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

1934

if(devnull == -1){

1935

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

1936

return;

1937

}

1938

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

1939

direntry = direntries[i];

1940

if(debug){

1941

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

1942

direntry->d_name);

1943

}

1944

pid_t hook_pid = fork();

1945

if(hook_pid == 0){

1946

/* Child */

1947

/* Raise privileges */

1948

errno = raise_privileges_permanently();

1949

if(errno != 0){

1950

perror_plus("Failed to raise privileges");

1951

_exit(EX_NOPERM);

1952

}

1953

/* Set group */

1954

errno = 0;

1955

ret = setgid(0);

1956

if(ret == -1){

1957

perror_plus("setgid");

1958

_exit(EX_NOPERM);

1959

}

1960

/* Reset supplementary groups */

1961

errno = 0;

1962

ret = setgroups(0, NULL);

1963

if(ret == -1){

1964

perror_plus("setgroups");

1965

_exit(EX_NOPERM);

1966

}

1967

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

1968

if(ret == -1){

1969

perror_plus("setenv");

1970

_exit(EX_OSERR);

1971

}

1972

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

1973

if(ret == -1){

1974

perror_plus("setenv");

1975

_exit(EX_OSERR);

1976

}

1977

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

1978

if(ret == -1){

1979

perror_plus("setenv");

1980

_exit(EX_OSERR);

1981

}

1982

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

1983

if(ret == -1){

1984

perror_plus("setenv");

1985

_exit(EX_OSERR);

1986

}

1987

char *delaystring;

1988

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

1989

if(ret == -1){

1990

perror_plus("asprintf");

1991

_exit(EX_OSERR);

1992

}

1993

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

1994

if(ret == -1){

1995

free(delaystring);

1996

perror_plus("setenv");

1997

_exit(EX_OSERR);

1998

}

1999

free(delaystring);

2000

if(connect_to != NULL){

2001

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

2002

if(ret == -1){

2003

perror_plus("setenv");

2004

_exit(EX_OSERR);

2005

}

2006

}

2007

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

2008

direntry->d_name,

2009

O_RDONLY));

2010

if(hook_fd == -1){

2011

perror_plus("openat");

2012

_exit(EXIT_FAILURE);

2013

}

2014

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

2015

perror_plus("close");

2016

_exit(EXIT_FAILURE);

2017

}

2018

ret = dup2(devnull, STDIN_FILENO);

2019

if(ret == -1){

2020

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

2021

_exit(EX_OSERR);

2022

}

2023

ret = close(devnull);

2024

if(ret == -1){

2025

perror_plus("close");

2026

_exit(EX_OSERR);

2027

}

2028

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2029

if(ret == -1){

2030

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

2031

_exit(EX_OSERR);

2032

}

2033

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

2034

environ) == -1){

2035

perror_plus("fexecve");

2036

_exit(EXIT_FAILURE);

2037

}

2038

} else {

2039

if(hook_pid == -1){

2040

perror_plus("fork");

2041

free(direntry);

2042

continue;

2043

}

2044

int status;

2045

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

2046

perror_plus("waitpid");

2047

free(direntry);

2048

continue;

2049

}

2050

if(WIFEXITED(status)){

2051

if(WEXITSTATUS(status) != 0){

2052

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

2053

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

2054

WEXITSTATUS(status));

2055

free(direntry);

2056

continue;

2057

}

2058

} else if(WIFSIGNALED(status)){

2059

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

2060

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

2061

WTERMSIG(status));

2062

free(direntry);

2063

continue;

2064

} else {

2065

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

2066

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

2067

free(direntry);

2068

continue;

2069

}

2070

}

2071

if(debug){

2072

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

2073

direntry->d_name);

2074

}

2075

free(direntry);

2076

}

2077

free(direntries);

2078

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

2079

perror_plus("close");

2080

} else {

2081

hookdir_fd = -1;

2082

}

2083

close(devnull);

2084

}

2085

2086

__attribute__((nonnull, warn_unused_result))

2087

int bring_up_interface(const char *const interface,

2088

const float delay){

2089

int old_errno = errno;

2090

int ret;

2091

struct ifreq network;

2092

unsigned int if_index = if_nametoindex(interface);

2093

if(if_index == 0){

2094

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

2095

errno = old_errno;

2096

return ENXIO;

2097

}

2098

2099

if(quit_now){

2100

errno = old_errno;

2101

return EINTR;

2102

}

2103

2104

if(not interface_is_up(interface)){

2105

int ret_errno = 0;

2106

int ioctl_errno = 0;

2107

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

2108

ret_errno = errno;

2109

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

2110

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

2111

errno = old_errno;

2112

return ret_errno;

2113

}

2114

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

2115

2116

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

2117

if(sd == -1){

2118

ret_errno = errno;

2119

perror_plus("socket");

2120

errno = old_errno;

2121

return ret_errno;

2122

}

2123

2124

if(quit_now){

2125

ret = close(sd);

2126

if(ret == -1){

2127

perror_plus("close");

2128

}

2129

errno = old_errno;

2130

return EINTR;

2131

}

2132

2133

if(debug){

2134

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

2135

interface);

2136

}

2137

2138

/* Raise privileges */

2139

ret_errno = raise_privileges();

2140

if(ret_errno != 0){

2141

errno = ret_errno;

2142

perror_plus("Failed to raise privileges");

2143

}

2144

2145

#ifdef __linux__

2146

int ret_linux;

2147

bool restore_loglevel = false;

2148

if(ret_errno == 0){

2149

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2150

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

2151

ret_linux = klogctl(8, NULL, 5);

2152

if(ret_linux == -1){

2153

perror_plus("klogctl");

2154

} else {

2155

restore_loglevel = true;

2156

}

2157

}

2158

#endif /* __linux__ */

2159

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

2160

ioctl_errno = errno;

2161

#ifdef __linux__

2162

if(restore_loglevel){

2163

ret_linux = klogctl(7, NULL, 0);

2164

if(ret_linux == -1){

2165

perror_plus("klogctl");

2166

}

2167

}

2168

#endif /* __linux__ */

2169

2170

/* If raise_privileges() succeeded above */

2171

if(ret_errno == 0){

2172

/* Lower privileges */

2173

ret_errno = lower_privileges();

2174

if(ret_errno != 0){

2175

errno = ret_errno;

2176

perror_plus("Failed to lower privileges");

2177

}

2178

}

2179

2180

/* Close the socket */

2181

ret = close(sd);

2182

if(ret == -1){

2183

perror_plus("close");

2184

}

2185

2186

if(ret_setflags == -1){

2187

errno = ioctl_errno;

2188

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2189

errno = old_errno;

2190

return ioctl_errno;

2191

}

2192

} else if(debug){

2193

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

2194

interface);

2195

}

2196

2197

/* Sleep checking until interface is running.

2198

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

2199

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

2200

if(interface_is_running(interface)){

2201

break;

2202

}

2203

struct timespec sleeptime = { .tv_nsec = 250000000 };

2204

ret = nanosleep(&sleeptime, NULL);

2205

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

2206

perror_plus("nanosleep");

2207

}

2208

}

2209

2210

errno = old_errno;

2211

return 0;

2212

}

2213

2214

__attribute__((nonnull, warn_unused_result))

2215

int take_down_interface(const char *const interface){

2216

int old_errno = errno;

2217

struct ifreq network;

2218

unsigned int if_index = if_nametoindex(interface);

2219

if(if_index == 0){

2220

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

2221

errno = old_errno;

2222

return ENXIO;

2223

}

2224

if(interface_is_up(interface)){

2225

int ret_errno = 0;

2226

int ioctl_errno = 0;

2227

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

2228

ret_errno = errno;

2229

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

2230

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

2231

errno = old_errno;

2232

return ret_errno;

2233

}

2234

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

2235

2236

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

2237

if(sd == -1){

2238

ret_errno = errno;

2239

perror_plus("socket");

2240

errno = old_errno;

2241

return ret_errno;

2242

}

2243

2244

if(debug){

2245

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

2246

interface);

2247

}

2248

2249

/* Raise privileges */

2250

ret_errno = raise_privileges();

2251

if(ret_errno != 0){

2252

errno = ret_errno;

2253

perror_plus("Failed to raise privileges");

2254

}

2255

2256

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

2257

ioctl_errno = errno;

2258

2259

/* If raise_privileges() succeeded above */

2260

if(ret_errno == 0){

2261

/* Lower privileges */

2262

ret_errno = lower_privileges();

2263

if(ret_errno != 0){

2264

errno = ret_errno;

2265

perror_plus("Failed to lower privileges");

2266

}

2267

}

2268

2269

/* Close the socket */

2270

int ret = close(sd);

2271

if(ret == -1){

2272

perror_plus("close");

2273

}

2274

2275

if(ret_setflags == -1){

2276

errno = ioctl_errno;

2277

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2278

errno = old_errno;

2279

return ioctl_errno;

2280

}

2281

} else if(debug){

2282

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

2283

interface);

2284

}

2285

2286

errno = old_errno;

2287

return 0;

1021

2288

}

1022

2289

1023

2290

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

2291

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

2292

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

2293

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

2294

.current_server = NULL, .interfaces = NULL,

2295

.interfaces_size = 0 };

1024

2296

AvahiSServiceBrowser *sb = NULL;

1025

int error;

2297

error_t ret_errno;

1026

2298

int ret;

1027

2299

intmax_t tmpmax;

1028

2300

char *tmp;

1029

2301

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;

2302

char *interfaces_to_take_down = NULL;

2303

size_t interfaces_to_take_down_size = 0;

2304

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

2305

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

2306

char *tempdir = NULL;

1039

2307

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1040

2308

const char *seckey = PATHDIR "/" SECKEY;

1041

2309

const char *pubkey = PATHDIR "/" PUBKEY;

2310

const char *dh_params_file = NULL;

2311

char *interfaces_hooks = NULL;

1042

2312

1043

2313

bool gnutls_initialized = false;

1044

2314

bool gpgme_initialized = false;

1045

2315

float delay = 2.5f;

2316

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

2317

retrying the same server again */

1046

2318

1047

2319

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1048

2320

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1054

2326

errno = 0;

1055

2327

ret = setgid(gid);

1056

2328

if(ret == -1){

1057

perror("setgid");

2329

perror_plus("setgid");

1058

2330

}

1059

2331

1060

2332

/* Lower user privileges (temporarily) */

1061

2333

errno = 0;

1062

2334

ret = seteuid(uid);

1063

2335

if(ret == -1){

1064

perror("seteuid");

2336

perror_plus("seteuid");

1065

2337

}

1066

2338

1067

2339

if(quit_now){

1094

2366

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

1095

2367

" Diffie-Hellman key exchange",

1096

2368

.group = 2 },

2369

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

2370

.arg = "FILE",

2371

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

2372

" for the Diffie-Hellman key exchange",

2373

.group = 2 },

1097

2374

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

1098

2375

.arg = "STRING",

1099

2376

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

1102

2379

.arg = "SECONDS",

1103

2380

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

1104

2381

.group = 2 },

2382

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

2383

.arg = "SECONDS",

2384

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

2385

.group = 2 },

2386

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

2387

.arg = "DIR",

2388

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

2389

.group = 2 },

1105

2390

/*

1106

2391

* These reproduce what we would get without ARGP_NO_HELP

1107

2392

*/

1125

2410

connect_to = arg;

1126

2411

break;

1127

2412

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

1128

interface = arg;

2413

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

2414

arg, (int)',');

2415

if(ret_errno != 0){

2416

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

2417

}

1129

2418

break;

1130

2419

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

1131

2420

seckey = arg;

1142

2431

}

1143

2432

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

1144

2433

break;

2434

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

2435

dh_params_file = arg;

2436

break;

1145

2437

case 130: /* --priority */

1146

2438

mc.priority = arg;

1147

2439

break;

1151

2443

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

1152

2444

argp_error(state, "Bad delay");

1153

2445

}

2446

case 132: /* --retry */

2447

errno = 0;

2448

retry_interval = strtod(arg, &tmp);

2449

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

2450

or (retry_interval * 1000) > INT_MAX

2451

or retry_interval < 0){

2452

argp_error(state, "Bad retry interval");

2453

}

2454

break;

2455

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

2456

hookdir = arg;

1154

2457

break;

1155

2458

/*

1156

2459

* These reproduce what we would get without ARGP_NO_HELP

1163

2466

argp_state_help(state, state->out_stream,

1164

2467

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1165

2468

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

1166

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

2469

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

1167

2470

exit(argp_err_exit_status);

1168

2471

break;

1169

2472

default:

1176

2479

.args_doc = "",

1177

2480

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

1178

2481

" passwords from a Mandos server" };

1179

ret = argp_parse(&argp, argc, argv,

1180

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1181

switch(ret){

2482

ret_errno = argp_parse(&argp, argc, argv,

2483

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2484

switch(ret_errno){

1182

2485

case 0:

1183

2486

break;

1184

2487

case ENOMEM:

1185

2488

default:

1186

errno = ret;

1187

perror("argp_parse");

2489

errno = ret_errno;

2490

perror_plus("argp_parse");

1188

2491

exitcode = EX_OSERR;

1189

2492

goto end;

1190

2493

case EINVAL:

1193

2496

}

1194

2497

}

1195

2498

2499

{

2500

/* Work around Debian bug #633582:

2501

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

2502

2503

/* Re-raise privileges */

2504

ret = raise_privileges();

2505

if(ret != 0){

2506

errno = ret;

2507

perror_plus("Failed to raise privileges");

2508

} else {

2509

struct stat st;

2510

2511

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

2512

int seckey_fd = open(seckey, O_RDONLY);

2513

if(seckey_fd == -1){

2514

perror_plus("open");

2515

} else {

2516

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

2517

if(ret == -1){

2518

perror_plus("fstat");

2519

} else {

2520

if(S_ISREG(st.st_mode)

2521

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

2522

ret = fchown(seckey_fd, uid, gid);

2523

if(ret == -1){

2524

perror_plus("fchown");

2525

}

2526

}

2527

}

2528

close(seckey_fd);

2529

}

2530

}

2531

2532

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

2533

int pubkey_fd = open(pubkey, O_RDONLY);

2534

if(pubkey_fd == -1){

2535

perror_plus("open");

2536

} else {

2537

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

2538

if(ret == -1){

2539

perror_plus("fstat");

2540

} else {

2541

if(S_ISREG(st.st_mode)

2542

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

2543

ret = fchown(pubkey_fd, uid, gid);

2544

if(ret == -1){

2545

perror_plus("fchown");

2546

}

2547

}

2548

}

2549

close(pubkey_fd);

2550

}

2551

}

2552

2553

if(dh_params_file != NULL

2554

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

2555

int dhparams_fd = open(dh_params_file, O_RDONLY);

2556

if(dhparams_fd == -1){

2557

perror_plus("open");

2558

} else {

2559

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

2560

if(ret == -1){

2561

perror_plus("fstat");

2562

} else {

2563

if(S_ISREG(st.st_mode)

2564

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

2565

ret = fchown(dhparams_fd, uid, gid);

2566

if(ret == -1){

2567

perror_plus("fchown");

2568

}

2569

}

2570

}

2571

close(dhparams_fd);

2572

}

2573

}

2574

2575

/* Lower privileges */

2576

ret = lower_privileges();

2577

if(ret != 0){

2578

errno = ret;

2579

perror_plus("Failed to lower privileges");

2580

}

2581

}

2582

}

2583

2584

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

2585

{

2586

char *interface = NULL;

2587

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

2588

interface))){

2589

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

2590

and if_nametoindex(interface) == 0){

2591

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

2592

fprintf_plus(stderr, "Not using nonexisting interface"

2593

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

2594

}

2595

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

2596

interface = NULL;

2597

}

2598

}

2599

}

2600

2601

/* Run network hooks */

2602

{

2603

if(mc.interfaces != NULL){

2604

interfaces_hooks = malloc(mc.interfaces_size);

2605

if(interfaces_hooks == NULL){

2606

perror_plus("malloc");

2607

goto end;

2608

}

2609

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

2610

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

2611

}

2612

run_network_hooks("start", interfaces_hooks != NULL ?

2613

interfaces_hooks : "", delay);

2614

}

2615

1196

2616

if(not debug){

1197

2617

avahi_set_log_function(empty_log);

1198

2618

}

1201

2621

from the signal handler */

1202

2622

/* Initialize the pseudo-RNG for Avahi */

1203

2623

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");

2624

simple_poll = avahi_simple_poll_new();

2625

if(simple_poll == NULL){

2626

fprintf_plus(stderr,

2627

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

1207

2628

exitcode = EX_UNAVAILABLE;

1208

2629

goto end;

1209

2630

}

1211

2632

sigemptyset(&sigterm_action.sa_mask);

1212

2633

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

1213

2634

if(ret == -1){

1214

perror("sigaddset");

2635

perror_plus("sigaddset");

1215

2636

exitcode = EX_OSERR;

1216

2637

goto end;

1217

2638

}

1218

2639

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

1219

2640

if(ret == -1){

1220

perror("sigaddset");

2641

perror_plus("sigaddset");

1221

2642

exitcode = EX_OSERR;

1222

2643

goto end;

1223

2644

}

1224

2645

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

1225

2646

if(ret == -1){

1226

perror("sigaddset");

2647

perror_plus("sigaddset");

1227

2648

exitcode = EX_OSERR;

1228

2649

goto end;

1229

2650

}

1233

2654

*/

1234

2655

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

1235

2656

if(ret == -1){

1236

perror("sigaction");

2657

perror_plus("sigaction");

1237

2658

return EX_OSERR;

1238

2659

}

1239

2660

if(old_sigterm_action.sa_handler != SIG_IGN){

1240

2661

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

1241

2662

if(ret == -1){

1242

perror("sigaction");

2663

perror_plus("sigaction");

1243

2664

exitcode = EX_OSERR;

1244

2665

goto end;

1245

2666

}

1246

2667

}

1247

2668

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

1248

2669

if(ret == -1){

1249

perror("sigaction");

2670

perror_plus("sigaction");

1250

2671

return EX_OSERR;

1251

2672

}

1252

2673

if(old_sigterm_action.sa_handler != SIG_IGN){

1253

2674

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

1254

2675

if(ret == -1){

1255

perror("sigaction");

2676

perror_plus("sigaction");

1256

2677

exitcode = EX_OSERR;

1257

2678

goto end;

1258

2679

}

1259

2680

}

1260

2681

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

1261

2682

if(ret == -1){

1262

perror("sigaction");

2683

perror_plus("sigaction");

1263

2684

return EX_OSERR;

1264

2685

}

1265

2686

if(old_sigterm_action.sa_handler != SIG_IGN){

1266

2687

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

1267

2688

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");

2689

perror_plus("sigaction");

2690

exitcode = EX_OSERR;

2691

goto end;

2692

}

2693

}

2694

2695

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

2696

if(mc.interfaces == NULL){

2697

struct dirent **direntries = NULL;

2698

/* Look for any good interfaces */

2699

ret = scandir(sys_class_net, &direntries, good_interface,

2700

alphasort);

2701

if(ret >= 1){

2702

/* Add all found interfaces to interfaces list */

2703

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

2704

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

2705

direntries[i]->d_name);

2706

if(ret_errno != 0){

2707

errno = ret_errno;

2708

perror_plus("argz_add");

2709

free(direntries[i]);

2710

continue;

2711

}

2712

if(debug){

2713

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

2714

direntries[i]->d_name);

2715

}

2716

free(direntries[i]);

2717

}

2718

free(direntries);

2719

} else {

2720

if(ret == 0){

2721

free(direntries);

2722

}

2723

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

2724

exitcode = EXIT_FAILURE;

2725

goto end;

2726

}

2727

}

2728

2729

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

2730

{

2731

char *interface = NULL;

2732

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

2733

interface))){

2734

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

2735

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

2736

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

2737

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

2738

interface);

2739

interface = NULL;

2740

while((interface = argz_next(mc.interfaces,

2741

mc.interfaces_size, interface))){

2742

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

2743

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

2744

interface);

2745

interface = NULL;

1359

2746

}

1360

2747

}

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

2748

break;

1378

2749

}

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

}

2750

bool interface_was_up = interface_is_up(interface);

2751

errno = bring_up_interface(interface, delay);

2752

if(not interface_was_up){

2753

if(errno != 0){

2754

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

2755

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

2756

} else {

2757

errno = argz_add(&interfaces_to_take_down,

2758

&interfaces_to_take_down_size,

2759

interface);

2760

if(errno != 0){

2761

perror_plus("argz_add");

2762

}

2763

}

2764

}

2765

}

2766

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

2767

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

2768

}

2769

}

2770

2771

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

2772

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

2773

if(debug){

2774

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

2775

mc.interfaces);

2776

}

2777

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

1416

2778

}

1417

2779

1418

2780

if(quit_now){

1419

2781

goto end;

1420

2782

}

1421

2783

1422

ret = init_gnutls_global(pubkey, seckey);

2784

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

1423

2785

if(ret == -1){

1424

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

2786

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

1425

2787

exitcode = EX_UNAVAILABLE;

1426

2788

goto end;

1427

2789

} else {

1432

2794

goto end;

1433

2795

}

1434

2796

1435

tempdir_created = true;

1436

if(mkdtemp(tempdir) == NULL){

1437

tempdir_created = false;

1438

perror("mkdtemp");

2797

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

2798

tempdir = mkdtemp(run_tempdir);

2799

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

2800

if(debug){

2801

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

2802

run_tempdir, old_tempdir);

2803

}

2804

tempdir = mkdtemp(old_tempdir);

2805

}

2806

if(tempdir == NULL){

2807

perror_plus("mkdtemp");

1439

2808

goto end;

1440

2809

}

1441

2810

1443

2812

goto end;

1444

2813

}

1445

2814

1446

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

1447

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

2815

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

2816

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

1448

2817

exitcode = EX_UNAVAILABLE;

1449

2818

goto end;

1450

2819

} else {

1459

2828

/* Connect directly, do not use Zeroconf */

1460

2829

/* (Mainly meant for debugging) */

1461

2830

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

2831

1462

2832

if(address == NULL){

1463

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

2833

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

1464

2834

exitcode = EX_USAGE;

1465

2835

goto end;

1466

2836

}

1469

2839

goto end;

1470

2840

}

1471

2841

1472

uint16_t port;

2842

in_port_t port;

1473

2843

errno = 0;

1474

2844

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

1475

2845

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

1476

or tmpmax != (uint16_t)tmpmax){

1477

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

2846

or tmpmax != (in_port_t)tmpmax){

2847

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

1478

2848

exitcode = EX_USAGE;

1479

2849

goto end;

1480

2850

}

1481

2851

1482

2852

if(quit_now){

1483

2853

goto end;

1484

2854

}

1485

2855

1486

port = (uint16_t)tmpmax;

2856

port = (in_port_t)tmpmax;

1487

2857

*address = '\0';

1488

address = connect_to;

1489

2858

/* Colon in address indicates IPv6 */

1490

2859

int af;

1491

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

2860

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

1492

2861

af = AF_INET6;

2862

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

2863

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

2864

{

2865

connect_to++;

2866

address[-1] = '\0';

2867

}

1493

2868

} else {

1494

2869

af = AF_INET;

1495

2870

}

2871

address = connect_to;

1496

2872

1497

2873

if(quit_now){

1498

2874

goto end;

1499

2875

}

1500

2876

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 {

2877

while(not quit_now){

2878

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

2879

&mc);

2880

if(quit_now or ret == 0){

2881

break;

2882

}

2883

if(debug){

2884

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

2885

(int)retry_interval);

2886

}

2887

sleep((unsigned int)retry_interval);

2888

}

2889

2890

if(not quit_now){

1523

2891

exitcode = EXIT_SUCCESS;

1524

2892

}

2893

1525

2894

goto end;

1526

2895

}

1527

2896

1539

2908

config.publish_domain = 0;

1540

2909

1541

2910

/* Allocate a new server */

1542

mc.server = avahi_server_new(avahi_simple_poll_get

1543

(mc.simple_poll), &config, NULL,

1544

NULL, &error);

2911

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2912

&config, NULL, NULL, &ret);

1545

2913

1546

2914

/* Free the Avahi configuration data */

1547

2915

avahi_server_config_free(&config);

1549

2917

1550

2918

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

1551

2919

if(mc.server == NULL){

1552

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

1553

avahi_strerror(error));

2920

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

2921

avahi_strerror(ret));

1554

2922

exitcode = EX_UNAVAILABLE;

1555

2923

goto end;

1556

2924

}

1562

2930

/* Create the Avahi service browser */

1563

2931

sb = avahi_s_service_browser_new(mc.server, if_index,

1564

2932

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1565

NULL, 0, browse_callback, NULL);

2933

NULL, 0, browse_callback,

2934

(void *)&mc);

1566

2935

if(sb == NULL){

1567

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

1568

avahi_strerror(avahi_server_errno(mc.server)));

2936

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

2937

avahi_strerror(avahi_server_errno(mc.server)));

1569

2938

exitcode = EX_UNAVAILABLE;

1570

2939

goto end;

1571

2940

}

1577

2946

/* Run the main loop */

1578

2947

1579

2948

if(debug){

1580

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

2949

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

1581

2950

}

1582

2951

1583

avahi_simple_poll_loop(mc.simple_poll);

2952

ret = avahi_loop_with_timeout(simple_poll,

2953

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

2954

if(debug){

2955

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

2956

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

2957

}

1584

2958

1585

2959

end:

1586

2960

1587

2961

if(debug){

1588

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

2962

if(signal_received){

2963

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

2964

argv[0], signal_received,

2965

strsignal(signal_received));

2966

} else {

2967

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

2968

}

1589

2969

}

1590

2970

1591

2971

/* Cleanup things */

2972

free(mc.interfaces);

2973

1592

2974

if(sb != NULL)

1593

2975

avahi_s_service_browser_free(sb);

1594

2976

1595

2977

if(mc.server != NULL)

1596

2978

avahi_server_free(mc.server);

1597

2979

1598

if(mc.simple_poll != NULL)

1599

avahi_simple_poll_free(mc.simple_poll);

2980

if(simple_poll != NULL)

2981

avahi_simple_poll_free(simple_poll);

1600

2982

1601

2983

if(gnutls_initialized){

1602

2984

gnutls_certificate_free_credentials(mc.cred);

1603

gnutls_global_deinit();

1604

2985

gnutls_dh_params_deinit(mc.dh_params);

1605

2986

}

1606

2987

1608

2989

gpgme_release(mc.ctx);

1609

2990

}

1610

2991

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

}

2992

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

2993

has seen */

2994

if(mc.current_server != NULL){

2995

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

2996

while(mc.current_server != NULL){

2997

server *next = mc.current_server->next;

2998

#ifdef __GNUC__

2999

#pragma GCC diagnostic push

3000

#pragma GCC diagnostic ignored "-Wcast-qual"

3001

#endif

3002

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

3003

#ifdef __GNUC__

3004

#pragma GCC diagnostic pop

3005

#endif

3006

free(mc.current_server);

3007

mc.current_server = next;

3008

}

3009

}

3010

3011

/* Re-raise privileges */

3012

{

3013

ret = raise_privileges();

3014

if(ret != 0){

3015

errno = ret;

3016

perror_plus("Failed to raise privileges");

3017

} else {

3018

3019

/* Run network hooks */

3020

run_network_hooks("stop", interfaces_hooks != NULL ?

3021

interfaces_hooks : "", delay);

3022

3023

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

3024

{

3025

char *interface = NULL;

3026

while((interface = argz_next(interfaces_to_take_down,

3027

interfaces_to_take_down_size,

3028

interface))){

3029

ret = take_down_interface(interface);

3030

if(ret != 0){

3031

errno = ret;

3032

perror_plus("Failed to take down interface");

3033

}

3034

}

3035

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

3036

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

3037

" down\n");

3038

}

3039

}

3040

}

3041

3042

ret = lower_privileges_permanently();

3043

if(ret != 0){

3044

errno = ret;

3045

perror_plus("Failed to lower privileges permanently");

3046

}

3047

}

3048

3049

free(interfaces_to_take_down);

3050

free(interfaces_hooks);

3051

3052

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

3053

uintmax_t level){

3054

struct dirent **direntries = NULL;

3055

int dret;

3056

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

3057

O_RDONLY

3058

| O_NOFOLLOW

3059

| O_DIRECTORY

3060

| O_PATH));

3061

if(dir_fd == -1){

3062

perror_plus("open");

3063

}

3064

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

3065

notdotentries, alphasort);

3066

if(numentries >= 0){

3067

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

3068

if(debug){

3069

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

3070

dirname, direntries[i]->d_name);

3071

}

3072

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

3073

if(dret == -1){

3074

if(errno == EISDIR){

3075

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

3076

AT_REMOVEDIR);

3077

}

3078

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

3079

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

3080

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

3081

/* Recurse only in this special case */

3082

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

3083

dret = 0;

3084

}

3085

if(dret == -1){

3086

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

3087

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

3088

}

3089

}

3090

free(direntries[i]);

3091

}

3092

3093

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

3094

free(direntries);

3095

if(numentries == -1){

3096

perror_plus("scandirat");

3097

}

3098

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3099

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

3100

perror_plus("rmdir");

3101

}

3102

} else {

3103

perror_plus("scandirat");

3104

}

3105

close(dir_fd);

3106

}

3107

3108

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

3109

if(tempdir != NULL){

3110

clean_dir_at(-1, tempdir, 0);

1685

3111

}

1686

3112

1687

3113

if(quit_now){

1691

3117

&old_sigterm_action,

1692

3118

NULL));

1693

3119

if(ret == -1){

1694

perror("sigaction");

3120

perror_plus("sigaction");

1695

3121

}

1696

3122

do {

1697

3123

ret = raise(signal_received);

1698

3124

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

1699

3125

if(ret != 0){

1700

perror("raise");

3126

perror_plus("raise");

1701

3127

abort();

1702

3128

}

1703

3129

TEMP_FAILURE_RETRY(pause());