/mandos/release : revision 24.1.148

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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@recompile.se>.

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* Contact the authors at <mandos@fukt.bsnet.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 /* not _LARGEFILE_SOURCE */

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#endif

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#ifndef _FILE_OFFSET_BITS

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#define _FILE_OFFSET_BITS 64

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#endif /* not _FILE_OFFSET_BITS */

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#endif

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

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

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stdout, ferror() */

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

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stdout, ferror(), remove() */

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

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

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

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strtof(), abort() */

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sockaddr_in6, PF_INET6,

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SOCK_STREAM, uid_t, gid_t, open(),

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opendir(), DIR */

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

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

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

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inet_pton(), connect(),

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getnameinfo() */

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

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inet_pton(), connect() */

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

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

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*/

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

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strtoimax() */

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

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program_invocation_short_name */

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

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#include <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 <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(), _exit(),

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unlinkat() */

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

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setgid(), pause() */

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

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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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89

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

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107

init_gnutls_session(),

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108

GNUTLS_* */

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109

#include <gnutls/openpgp.h>

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* GPGME */

125

114

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

133

122

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

134

123

#define SECKEY "seckey.txt"

135

124

#define PUBKEY "pubkey.txt"

136

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

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125

138

126

bool debug = false;

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127

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@recompile.se>";

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

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char *connect_to = NULL;

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const char *hookdir = HOOKDIR;

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int hookdir_fd = -1;

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uid_t uid = 65534;

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gid_t gid = 65534;

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149

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

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typedef struct server{

151

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

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160

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

161

132

typedef struct {

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AvahiSimplePoll *simple_poll;

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AvahiServer *server;

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gnutls_certificate_credentials_t cred;

164

136

unsigned int dh_bits;

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137

gnutls_dh_params_t dh_params;

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const char *priority;

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139

gpgme_ctx_t ctx;

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server *current_server;

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char *interfaces;

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size_t interfaces_size;

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140

} mandos_context;

172

141

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/* global so signal handler can reach it*/

174

AvahiSimplePoll *simple_poll;

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"

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

175

146

176

147

sig_atomic_t quit_now = 0;

177

148

int signal_received = 0;

178

149

179

/* Function to use when printing errors */

180

void perror_plus(const char *print_text){

181

int e = errno;

182

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

183

program_invocation_short_name);

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errno = e;

185

perror(print_text);

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}

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188

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

189

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

190

va_list ap;

191

va_start (ap, format);

192

193

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

194

program_invocation_short_name));

195

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

196

}

197

198

150

/*

199

151

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

200

152

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

201

153

* "buffer_length" is how much is already used.

202

154

*/

203

__attribute__((nonnull, warn_unused_result))

204

155

size_t incbuffer(char **buffer, size_t buffer_length,

205

size_t buffer_capacity){

156

size_t buffer_capacity){

206

157

if(buffer_length + BUFFER_SIZE > buffer_capacity){

207

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

208

if(new_buf == NULL){

209

int old_errno = errno;

210

free(*buffer);

211

errno = old_errno;

212

*buffer = NULL;

158

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

159

if(buffer == NULL){

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160

return 0;

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161

}

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*buffer = new_buf;

216

162

buffer_capacity += BUFFER_SIZE;

217

163

}

218

164

return buffer_capacity;

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165

}

220

166

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

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__attribute__((nonnull, warn_unused_result))

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

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int af, server **current_server){

225

int ret;

226

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

227

if(new_server == NULL){

228

perror_plus("malloc");

229

return false;

230

}

231

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

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.port = port,

233

.if_index = if_index,

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.af = af };

235

if(new_server->ip == NULL){

236

perror_plus("strdup");

237

free(new_server);

238

return false;

239

}

240

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

241

if(ret == -1){

242

perror_plus("clock_gettime");

243

#ifdef __GNUC__

244

#pragma GCC diagnostic push

245

#pragma GCC diagnostic ignored "-Wcast-qual"

246

#endif

247

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

248

#ifdef __GNUC__

249

#pragma GCC diagnostic pop

250

#endif

251

free(new_server);

252

return false;

253

}

254

/* Special case of first server */

255

if(*current_server == NULL){

256

new_server->next = new_server;

257

new_server->prev = new_server;

258

*current_server = new_server;

259

} else {

260

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

261

new_server->next = *current_server;

262

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;

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}

266

return true;

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}

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269

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/*

270

168

* Initialize GPGME.

271

169

*/

272

__attribute__((nonnull, warn_unused_result))

273

static bool init_gpgme(const char * const seckey,

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const char * const pubkey,

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const char * const tempdir,

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mandos_context *mc){

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static bool init_gpgme(const char *seckey,

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const char *pubkey, const char *tempdir){

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gpgme_error_t rc;

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gpgme_engine_info_t engine_info;

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/*

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

282

178

*/

283

bool import_key(const char * const filename){

179

bool import_key(const char *filename){

284

180

int ret;

285

181

int fd;

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182

gpgme_data_t pgp_data;

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

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185

if(fd == -1){

290

perror_plus("open");

186

perror("open");

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187

return false;

292

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}

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190

rc = gpgme_data_new_from_fd(&pgp_data, fd);

295

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

299

195

}

300

196

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

197

rc = gpgme_op_import(mc.ctx, pgp_data);

302

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if(rc != GPG_ERR_NO_ERROR){

303

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

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gpgme_strsource(rc), gpgme_strerror(rc));

199

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

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gpgme_strsource(rc), gpgme_strerror(rc));

305

201

return false;

306

202

}

307

203

308

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

309

205

if(ret == -1){

310

perror_plus("close");

206

perror("close");

311

207

}

312

208

gpgme_data_release(pgp_data);

313

209

return true;

314

210

}

315

211

316

212

if(debug){

317

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

213

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

318

214

}

319

215

320

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/* Init GPGME */

321

217

gpgme_check_version(NULL);

322

218

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

323

219

if(rc != GPG_ERR_NO_ERROR){

324

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

325

gpgme_strsource(rc), gpgme_strerror(rc));

220

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

221

gpgme_strsource(rc), gpgme_strerror(rc));

326

222

return false;

327

223

}

328

224

329

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

225

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

330

226

rc = gpgme_get_engine_info(&engine_info);

331

227

if(rc != GPG_ERR_NO_ERROR){

332

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

333

gpgme_strsource(rc), gpgme_strerror(rc));

228

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

229

gpgme_strsource(rc), gpgme_strerror(rc));

334

230

return false;

335

231

}

336

232

while(engine_info != NULL){

342

238

engine_info = engine_info->next;

343

239

}

344

240

if(engine_info == NULL){

345

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

346

tempdir);

241

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

347

242

return false;

348

243

}

349

244

350

245

/* Create new GPGME "context" */

351

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

246

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

352

247

if(rc != GPG_ERR_NO_ERROR){

353

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

354

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

355

gpgme_strerror(rc));

248

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

249

gpgme_strsource(rc), gpgme_strerror(rc));

356

250

return false;

357

251

}

358

252

367

261

* Decrypt OpenPGP data.

368

262

* Returns -1 on error

369

263

*/

370

__attribute__((nonnull, warn_unused_result))

371

264

static ssize_t pgp_packet_decrypt(const char *cryptotext,

372

265

size_t crypto_size,

373

char **plaintext,

374

mandos_context *mc){

266

char **plaintext){

375

267

gpgme_data_t dh_crypto, dh_plain;

376

268

gpgme_error_t rc;

377

269

ssize_t ret;

379

271

ssize_t plaintext_length = 0;

380

272

381

273

if(debug){

382

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

274

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

383

275

}

384

276

385

277

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

386

278

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

387

279

0);

388

280

if(rc != GPG_ERR_NO_ERROR){

389

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

390

gpgme_strsource(rc), gpgme_strerror(rc));

281

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

282

gpgme_strsource(rc), gpgme_strerror(rc));

391

283

return -1;

392

284

}

393

285

394

286

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

395

287

rc = gpgme_data_new(&dh_plain);

396

288

if(rc != GPG_ERR_NO_ERROR){

397

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

398

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

399

gpgme_strsource(rc), gpgme_strerror(rc));

289

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

290

gpgme_strsource(rc), gpgme_strerror(rc));

400

291

gpgme_data_release(dh_crypto);

401

292

return -1;

402

293

}

403

294

404

295

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

405

296

data buffer */

406

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

297

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

407

298

if(rc != GPG_ERR_NO_ERROR){

408

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

409

gpgme_strsource(rc), gpgme_strerror(rc));

299

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

300

gpgme_strsource(rc), gpgme_strerror(rc));

410

301

plaintext_length = -1;

411

302

if(debug){

412

303

gpgme_decrypt_result_t result;

413

result = gpgme_op_decrypt_result(mc->ctx);

304

result = gpgme_op_decrypt_result(mc.ctx);

414

305

if(result == NULL){

415

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

306

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

416

307

} else {

417

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

418

result->unsupported_algorithm);

419

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

420

result->wrong_key_usage);

308

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

309

result->unsupported_algorithm);

310

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

311

result->wrong_key_usage);

421

312

if(result->file_name != NULL){

422

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

313

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

423

314

}

424

315

gpgme_recipient_t recipient;

425

316

recipient = result->recipients;

426

317

while(recipient != NULL){

427

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

428

gpgme_pubkey_algo_name

429

(recipient->pubkey_algo));

430

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

431

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

432

recipient->status == GPG_ERR_NO_SECKEY

433

? "No" : "Yes");

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");

434

324

recipient = recipient->next;

435

325

}

436

326

}

439

329

}

440

330

441

331

if(debug){

442

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

332

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

443

333

}

444

334

445

335

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

446

336

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

447

perror_plus("gpgme_data_seek");

337

perror("gpgme_data_seek");

448

338

plaintext_length = -1;

449

339

goto decrypt_end;

450

340

}

452

342

*plaintext = NULL;

453

343

while(true){

454

344

plaintext_capacity = incbuffer(plaintext,

455

(size_t)plaintext_length,

456

plaintext_capacity);

345

(size_t)plaintext_length,

346

plaintext_capacity);

457

347

if(plaintext_capacity == 0){

458

perror_plus("incbuffer");

459

plaintext_length = -1;

460

goto decrypt_end;

348

perror("incbuffer");

349

plaintext_length = -1;

350

goto decrypt_end;

461

351

}

462

352

463

353

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

468

358

break;

469

359

}

470

360

if(ret < 0){

471

perror_plus("gpgme_data_read");

361

perror("gpgme_data_read");

472

362

plaintext_length = -1;

473

363

goto decrypt_end;

474

364

}

476

366

}

477

367

478

368

if(debug){

479

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

369

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

480

370

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

481

371

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

482

372

}

493

383

return plaintext_length;

494

384

}

495

385

496

__attribute__((warn_unused_result))

497

static const char *safer_gnutls_strerror(int value){

498

const char *ret = gnutls_strerror(value);

386

static const char * safer_gnutls_strerror(int value){

387

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

388

-Wunreachable-code */

499

389

if(ret == NULL)

500

390

ret = "(unknown)";

501

391

return ret;

502

392

}

503

393

504

394

/* GnuTLS log function callback */

505

__attribute__((nonnull))

506

395

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

507

396

const char* string){

508

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

397

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

509

398

}

510

399

511

__attribute__((nonnull, warn_unused_result))

512

400

static int init_gnutls_global(const char *pubkeyfilename,

513

const char *seckeyfilename,

514

mandos_context *mc){

401

const char *seckeyfilename){

515

402

int ret;

516

403

517

404

if(debug){

518

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

405

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

519

406

}

520

407

521

408

ret = gnutls_global_init();

522

409

if(ret != GNUTLS_E_SUCCESS){

523

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

524

safer_gnutls_strerror(ret));

410

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

411

safer_gnutls_strerror(ret));

525

412

return -1;

526

413

}

527

414

534

421

}

535

422

536

423

/* OpenPGP credentials */

537

ret = gnutls_certificate_allocate_credentials(&mc->cred);

424

gnutls_certificate_allocate_credentials(&mc.cred);

538

425

if(ret != GNUTLS_E_SUCCESS){

539

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

540

safer_gnutls_strerror(ret));

426

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

427

from

428

-Wunreachable-code

429

*/

430

safer_gnutls_strerror(ret));

541

431

gnutls_global_deinit();

542

432

return -1;

543

433

}

544

434

545

435

if(debug){

546

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

547

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

548

pubkeyfilename,

549

seckeyfilename);

436

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

437

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

438

seckeyfilename);

550

439

}

551

440

552

441

ret = gnutls_certificate_set_openpgp_key_file

553

(mc->cred, pubkeyfilename, seckeyfilename,

442

(mc.cred, pubkeyfilename, seckeyfilename,

554

443

GNUTLS_OPENPGP_FMT_BASE64);

555

444

if(ret != GNUTLS_E_SUCCESS){

556

fprintf_plus(stderr,

557

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

558

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

559

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

560

safer_gnutls_strerror(ret));

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));

561

450

goto globalfail;

562

451

}

563

452

564

453

/* GnuTLS server initialization */

565

ret = gnutls_dh_params_init(&mc->dh_params);

454

ret = gnutls_dh_params_init(&mc.dh_params);

566

455

if(ret != GNUTLS_E_SUCCESS){

567

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

568

" initialization: %s\n",

569

safer_gnutls_strerror(ret));

456

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

457

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

570

458

goto globalfail;

571

459

}

572

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

460

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

573

461

if(ret != GNUTLS_E_SUCCESS){

574

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

575

safer_gnutls_strerror(ret));

462

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

463

safer_gnutls_strerror(ret));

576

464

goto globalfail;

577

465

}

578

466

579

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

467

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

580

468

581

469

return 0;

582

470

583

471

globalfail:

584

472

585

gnutls_certificate_free_credentials(mc->cred);

473

gnutls_certificate_free_credentials(mc.cred);

586

474

gnutls_global_deinit();

587

gnutls_dh_params_deinit(mc->dh_params);

475

gnutls_dh_params_deinit(mc.dh_params);

588

476

return -1;

589

477

}

590

478

591

__attribute__((nonnull, warn_unused_result))

592

static int init_gnutls_session(gnutls_session_t *session,

593

mandos_context *mc){

479

static int init_gnutls_session(gnutls_session_t *session){

594

480

int ret;

595

481

/* GnuTLS session creation */

596

482

do {

600

486

}

601

487

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

602

488

if(ret != GNUTLS_E_SUCCESS){

603

fprintf_plus(stderr,

604

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

605

safer_gnutls_strerror(ret));

489

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

490

safer_gnutls_strerror(ret));

606

491

}

607

492

608

493

{

609

494

const char *err;

610

495

do {

611

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

496

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

612

497

if(quit_now){

613

498

gnutls_deinit(*session);

614

499

return -1;

615

500

}

616

501

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

617

502

if(ret != GNUTLS_E_SUCCESS){

618

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

619

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

620

safer_gnutls_strerror(ret));

503

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

504

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

505

safer_gnutls_strerror(ret));

621

506

gnutls_deinit(*session);

622

507

return -1;

623

508

}

625

510

626

511

do {

627

512

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

628

mc->cred);

513

mc.cred);

629

514

if(quit_now){

630

515

gnutls_deinit(*session);

631

516

return -1;

632

517

}

633

518

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

634

519

if(ret != GNUTLS_E_SUCCESS){

635

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

636

safer_gnutls_strerror(ret));

520

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

521

safer_gnutls_strerror(ret));

637

522

gnutls_deinit(*session);

638

523

return -1;

639

524

}

641

526

/* ignore client certificate if any. */

642

527

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

643

528

644

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

529

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

645

530

646

531

return 0;

647

532

}

651

536

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

652

537

653

538

/* Called when a Mandos server is found */

654

__attribute__((nonnull, warn_unused_result))

655

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

539

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

656

540

AvahiIfIndex if_index,

657

int af, mandos_context *mc){

541

int af){

658

542

int ret, tcp_sd = -1;

659

543

ssize_t sret;

660

struct sockaddr_storage to;

544

union {

545

struct sockaddr_in in;

546

struct sockaddr_in6 in6;

547

} to;

661

548

char *buffer = NULL;

662

549

char *decrypted_buffer = NULL;

663

550

size_t buffer_length = 0;

682

569

pf = PF_INET;

683

570

break;

684

571

default:

685

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

572

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

686

573

errno = EINVAL;

687

574

return -1;

688

575

}

689

576

690

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

691

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

692

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

693

bool match = false;

694

{

695

char *interface = NULL;

696

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

697

interface))){

698

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

699

match = true;

700

break;

701

}

702

}

703

}

704

if(not match){

705

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

706

connect to the server */

707

if(debug){

708

char interface[IF_NAMESIZE];

709

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

710

perror_plus("if_indextoname");

711

} else {

712

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

713

" \"%s\"\n",

714

if_indextoname((unsigned int)if_index,

715

interface));

716

}

717

}

718

return -1;

719

}

720

}

721

722

ret = init_gnutls_session(&session, mc);

577

ret = init_gnutls_session(&session);

723

578

if(ret != 0){

724

579

return -1;

725

580

}

726

581

727

582

if(debug){

728

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

729

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

583

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

584

"\n", ip, port);

730

585

}

731

586

732

587

tcp_sd = socket(pf, SOCK_STREAM, 0);

733

588

if(tcp_sd < 0){

734

589

int e = errno;

735

perror_plus("socket");

590

perror("socket");

736

591

errno = e;

737

592

goto mandos_end;

738

593

}

744

599

745

600

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

746

601

if(af == AF_INET6){

747

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

748

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

602

to.in6.sin6_family = (sa_family_t)af;

603

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

749

604

} else { /* IPv4 */

750

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

751

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

605

to.in.sin_family = (sa_family_t)af;

606

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

752

607

}

753

608

if(ret < 0 ){

754

609

int e = errno;

755

perror_plus("inet_pton");

610

perror("inet_pton");

756

611

errno = e;

757

612

goto mandos_end;

758

613

}

759

614

if(ret == 0){

760

615

int e = errno;

761

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

616

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

762

617

errno = e;

763

618

goto mandos_end;

764

619

}

765

620

if(af == AF_INET6){

766

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

767

if(IN6_IS_ADDR_LINKLOCAL

768

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

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*/

769

628

if(if_index == AVAHI_IF_UNSPEC){

770

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

771

" incomplete without a network interface\n");

629

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

630

" without a network interface\n");

772

631

errno = EINVAL;

773

632

goto mandos_end;

774

633

}

775

634

/* Set the network interface number as scope */

776

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

635

to.in6.sin6_scope_id = (uint32_t)if_index;

777

636

}

778

637

} else {

779

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

638

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

639

-Wconversion and

640

-Wunreachable-code */

780

641

}

781

642

782

643

if(quit_now){

788

649

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

789

650

char interface[IF_NAMESIZE];

790

651

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

791

perror_plus("if_indextoname");

652

perror("if_indextoname");

792

653

} else {

793

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

794

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

654

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

655

ip, interface, port);

795

656

}

796

657

} else {

797

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

798

ip, (uintmax_t)port);

658

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

659

port);

799

660

}

800

661

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

801

662

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

663

const char *pcret;

802

664

if(af == AF_INET6){

803

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

804

sizeof(struct sockaddr_in6),

805

addrstr, sizeof(addrstr), NULL, 0,

806

NI_NUMERICHOST);

665

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

666

sizeof(addrstr));

807

667

} else {

808

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

809

sizeof(struct sockaddr_in),

810

addrstr, sizeof(addrstr), NULL, 0,

811

NI_NUMERICHOST);

668

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

669

sizeof(addrstr));

812

670

}

813

if(ret == EAI_SYSTEM){

814

perror_plus("getnameinfo");

815

} else if(ret != 0) {

816

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

817

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

818

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

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

}

819

677

}

820

678

}

821

679

825

683

}

826

684

827

685

if(af == AF_INET6){

828

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

829

sizeof(struct sockaddr_in6));

686

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

830

687

} else {

831

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

832

sizeof(struct sockaddr_in));

688

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

833

689

}

834

690

if(ret < 0){

835

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

836

int e = errno;

837

perror_plus("connect");

838

errno = e;

839

}

691

int e = errno;

692

perror("connect");

693

errno = e;

840

694

goto mandos_end;

841

695

}

842

696

850

704

while(true){

851

705

size_t out_size = strlen(out);

852

706

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

853

out_size - written));

707

out_size - written));

854

708

if(ret == -1){

855

709

int e = errno;

856

perror_plus("write");

710

perror("write");

857

711

errno = e;

858

712

goto mandos_end;

859

713

}

876

730

}

877

731

878

732

if(debug){

879

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

733

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

880

734

}

881

735

882

736

if(quit_now){

884

738

goto mandos_end;

885

739

}

886

740

887

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

888

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

889

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

890

gnutls_transport_set_ptr(session,

891

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

741

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

892

742

893

743

if(quit_now){

894

744

errno = EINTR;

905

755

906

756

if(ret != GNUTLS_E_SUCCESS){

907

757

if(debug){

908

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

758

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

909

759

gnutls_perror(ret);

910

760

}

911

761

errno = EPROTO;

915

765

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

916

766

917

767

if(debug){

918

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

919

" %s\n", ip);

768

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

769

ip);

920

770

}

921

771

922

772

while(true){

927

777

}

928

778

929

779

buffer_capacity = incbuffer(&buffer, buffer_length,

930

buffer_capacity);

780

buffer_capacity);

931

781

if(buffer_capacity == 0){

932

782

int e = errno;

933

perror_plus("incbuffer");

783

perror("incbuffer");

934

784

errno = e;

935

785

goto mandos_end;

936

786

}

960

810

}

961

811

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

962

812

if(ret < 0){

963

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

964

"***\n");

813

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

965

814

gnutls_perror(ret);

966

815

errno = EPROTO;

967

816

goto mandos_end;

968

817

}

969

818

break;

970

819

default:

971

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

972

" encrypted session with Mandos server\n");

820

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

821

" encrypted session with Mandos server\n");

973

822

gnutls_bye(session, GNUTLS_SHUT_RDWR);

974

823

errno = EIO;

975

824

goto mandos_end;

980

829

}

981

830

982

831

if(debug){

983

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

832

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

984

833

}

985

834

986

835

if(quit_now){

998

847

999

848

if(buffer_length > 0){

1000

849

ssize_t decrypted_buffer_size;

1001

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

1002

&decrypted_buffer, mc);

850

decrypted_buffer_size = pgp_packet_decrypt(buffer,

851

buffer_length,

852

&decrypted_buffer);

1003

853

if(decrypted_buffer_size >= 0){

1004

854

1005

855

written = 0;

1015

865

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

1016

866

int e = errno;

1017

867

if(debug){

1018

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

1019

strerror(errno));

868

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

869

strerror(errno));

1020

870

}

1021

871

errno = e;

1022

872

goto mandos_end;

1041

891

if(e == 0){

1042

892

e = errno;

1043

893

}

1044

perror_plus("close");

894

perror("close");

1045

895

}

1046

896

gnutls_deinit(session);

1047

errno = e;

1048

897

if(quit_now){

1049

errno = EINTR;

898

e = EINTR;

1050

899

retval = -1;

1051

900

}

901

errno = e;

1052

902

}

1053

903

return retval;

1054

904

}

1055

905

1056

__attribute__((nonnull))

1057

906

static void resolve_callback(AvahiSServiceResolver *r,

1058

907

AvahiIfIndex interface,

1059

908

AvahiProtocol proto,

1067

916

AVAHI_GCC_UNUSED AvahiStringList *txt,

1068

917

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1069

918

flags,

1070

void *mc){

1071

if(r == NULL){

1072

return;

1073

}

919

AVAHI_GCC_UNUSED void* userdata){

920

assert(r);

1074

921

1075

922

/* Called whenever a service has been resolved successfully or

1076

923

timed out */

1077

924

1078

925

if(quit_now){

1079

avahi_s_service_resolver_free(r);

1080

926

return;

1081

927

}

1082

928

1083

929

switch(event){

1084

930

default:

1085

931

case AVAHI_RESOLVER_FAILURE:

1086

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

1087

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

1088

domain,

1089

avahi_strerror(avahi_server_errno

1090

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

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)));

1091

935

break;

1092

936

1093

937

case AVAHI_RESOLVER_FOUND:

1095

939

char ip[AVAHI_ADDRESS_STR_MAX];

1096

940

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

1097

941

if(debug){

1098

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

1099

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

1100

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

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);

1101

945

}

1102

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

1103

interface,

1104

avahi_proto_to_af(proto),

1105

mc);

946

int ret = start_mandos_communication(ip, port, interface,

947

avahi_proto_to_af(proto));

1106

948

if(ret == 0){

1107

avahi_simple_poll_quit(simple_poll);

1108

} else {

1109

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

1110

avahi_proto_to_af(proto),

1111

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

1112

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

1113

" list\n", name);

1114

}

949

avahi_simple_poll_quit(mc.simple_poll);

1115

950

}

1116

951

}

1117

952

}

1127

962

const char *domain,

1128

963

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1129

964

flags,

1130

void *mc){

1131

if(b == NULL){

1132

return;

1133

}

965

AVAHI_GCC_UNUSED void* userdata){

966

assert(b);

1134

967

1135

968

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

1136

969

is removed from the LAN */

1143

976

default:

1144

977

case AVAHI_BROWSER_FAILURE:

1145

978

1146

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

1147

avahi_strerror(avahi_server_errno

1148

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

1149

avahi_simple_poll_quit(simple_poll);

979

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

980

avahi_strerror(avahi_server_errno(mc.server)));

981

avahi_simple_poll_quit(mc.simple_poll);

1150

982

return;

1151

983

1152

984

case AVAHI_BROWSER_NEW:

1155

987

the callback function is called the Avahi server will free the

1156

988

resolver for us. */

1157

989

1158

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

1159

interface, protocol, name, type,

1160

domain, protocol, 0,

1161

resolve_callback, mc) == NULL)

1162

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

1163

" %s\n", name,

1164

avahi_strerror(avahi_server_errno

1165

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

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)));

1166

995

break;

1167

996

1168

997

case AVAHI_BROWSER_REMOVE:

1171

1000

case AVAHI_BROWSER_ALL_FOR_NOW:

1172

1001

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1173

1002

if(debug){

1174

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

1175

" searching...\n");

1003

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

1176

1004

}

1177

1005

break;

1178

1006

}

1179

1007

}

1180

1008

1181

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

1009

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

1182

1010

static void handle_sigterm(int sig){

1183

1011

if(quit_now){

1184

1012

return;

1186

1014

quit_now = 1;

1187

1015

signal_received = sig;

1188

1016

int old_errno = errno;

1189

/* set main loop to exit */

1190

if(simple_poll != NULL){

1191

avahi_simple_poll_quit(simple_poll);

1192

}

1193

errno = old_errno;

1194

}

1195

1196

__attribute__((nonnull, warn_unused_result))

1197

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

1198

int ret;

1199

error_t ret_errno;

1200

1201

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

1202

if(s < 0){

1203

ret_errno = errno;

1204

perror_plus("socket");

1205

errno = ret_errno;

1206

return false;

1207

}

1208

strcpy(ifr->ifr_name, ifname);

1209

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1210

if(ret == -1){

1211

if(debug){

1212

ret_errno = errno;

1213

perror_plus("ioctl SIOCGIFFLAGS");

1214

errno = ret_errno;

1215

}

1216

return false;

1217

}

1218

return true;

1219

}

1220

1221

__attribute__((nonnull, warn_unused_result))

1222

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

1223

1224

/* Reject the loopback device */

1225

if(ifr->ifr_flags & IFF_LOOPBACK){

1226

if(debug){

1227

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

1228

ifname);

1229

}

1230

return false;

1231

}

1232

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

1233

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

1234

if(debug){

1235

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

1236

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

1237

}

1238

return true;

1239

}

1240

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

1241

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

1242

if(debug){

1243

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1244

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

1245

}

1246

return false;

1247

}

1248

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

1249

if(ifr->ifr_flags & IFF_NOARP){

1250

if(debug){

1251

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

1252

ifname);

1253

}

1254

return false;

1255

}

1256

1257

/* Accept this device */

1258

if(debug){

1259

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

1260

}

1261

return true;

1262

}

1263

1264

/*

1265

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

1266

* corresponds to an acceptable network device.

1267

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

1268

*/

1269

__attribute__((nonnull, warn_unused_result))

1270

int good_interface(const struct dirent *if_entry){

1271

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

1272

return 0;

1273

}

1274

1275

struct ifreq ifr;

1276

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

1277

if(debug){

1278

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

1279

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

1280

}

1281

return 0;

1282

}

1283

1284

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

1285

return 0;

1286

}

1287

return 1;

1288

}

1289

1290

/*

1291

* This function determines if a network interface is up.

1292

*/

1293

__attribute__((nonnull, warn_unused_result))

1294

bool interface_is_up(const char *interface){

1295

struct ifreq ifr;

1296

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

1297

if(debug){

1298

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

1299

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

1300

}

1301

return false;

1302

}

1303

1304

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

1305

}

1306

1307

/*

1308

* This function determines if a network interface is running

1309

*/

1310

__attribute__((nonnull, warn_unused_result))

1311

bool interface_is_running(const char *interface){

1312

struct ifreq ifr;

1313

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

1314

if(debug){

1315

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

1316

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

1317

}

1318

return false;

1319

}

1320

1321

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

1322

}

1323

1324

__attribute__((nonnull, pure, warn_unused_result))

1325

int notdotentries(const struct dirent *direntry){

1326

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

1327

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

1328

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

1329

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

1330

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

1331

return 0;

1332

}

1333

return 1;

1334

}

1335

1336

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

1337

__attribute__((nonnull, warn_unused_result))

1338

int runnable_hook(const struct dirent *direntry){

1339

int ret;

1340

size_t sret;

1341

struct stat st;

1342

1343

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

1344

/* Empty name? */

1345

return 0;

1346

}

1347

1348

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

1349

"abcdefghijklmnopqrstuvwxyz"

1350

"0123456789"

1351

"_.-");

1352

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

1353

/* Contains non-allowed characters */

1354

if(debug){

1355

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

1356

direntry->d_name);

1357

}

1358

return 0;

1359

}

1360

1361

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

1362

if(ret == -1){

1363

if(debug){

1364

perror_plus("Could not stat hook");

1365

}

1366

return 0;

1367

}

1368

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

1369

/* Not a regular file */

1370

if(debug){

1371

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

1372

direntry->d_name);

1373

}

1374

return 0;

1375

}

1376

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

1377

/* Not executable */

1378

if(debug){

1379

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

1380

direntry->d_name);

1381

}

1382

return 0;

1383

}

1384

if(debug){

1385

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

1386

direntry->d_name);

1387

}

1388

return 1;

1389

}

1390

1391

__attribute__((nonnull, warn_unused_result))

1392

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1393

mandos_context *mc){

1394

int ret;

1395

struct timespec now;

1396

struct timespec waited_time;

1397

intmax_t block_time;

1398

1399

while(true){

1400

if(mc->current_server == NULL){

1401

if(debug){

1402

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

1403

" No timeout!\n");

1404

}

1405

ret = avahi_simple_poll_iterate(s, -1);

1406

} else {

1407

if(debug){

1408

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

1409

" it, or wait\n");

1410

}

1411

/* the current time */

1412

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1413

if(ret == -1){

1414

perror_plus("clock_gettime");

1415

return -1;

1416

}

1417

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

1418

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

1419

waited_time.tv_sec = (now.tv_sec

1420

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

1421

waited_time.tv_nsec = (now.tv_nsec

1422

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

1423

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

1424

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

1425

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

1426

block_time = ((retry_interval

1427

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

1428

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

1429

1430

if(debug){

1431

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

1432

block_time);

1433

}

1434

1435

if(block_time <= 0){

1436

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

1437

mc->current_server->port,

1438

mc->current_server->if_index,

1439

mc->current_server->af, mc);

1440

if(ret == 0){

1441

avahi_simple_poll_quit(s);

1442

return 0;

1443

}

1444

ret = clock_gettime(CLOCK_MONOTONIC,

1445

&mc->current_server->last_seen);

1446

if(ret == -1){

1447

perror_plus("clock_gettime");

1448

return -1;

1449

}

1450

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

1451

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

1452

servers, but don't block */

1453

}

1454

1455

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

1456

}

1457

if(ret != 0){

1458

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

1459

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

1460

}

1461

}

1462

}

1463

}

1464

1465

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

1466

__attribute__((warn_unused_result))

1467

error_t raise_privileges(void){

1468

error_t old_errno = errno;

1469

error_t ret_errno = 0;

1470

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

1471

ret_errno = errno;

1472

}

1473

errno = old_errno;

1474

return ret_errno;

1475

}

1476

1477

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

1478

__attribute__((warn_unused_result))

1479

error_t raise_privileges_permanently(void){

1480

error_t old_errno = errno;

1481

error_t ret_errno = raise_privileges();

1482

if(ret_errno != 0){

1483

errno = old_errno;

1484

return ret_errno;

1485

}

1486

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

1487

ret_errno = errno;

1488

}

1489

errno = old_errno;

1490

return ret_errno;

1491

}

1492

1493

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

1494

__attribute__((warn_unused_result))

1495

error_t lower_privileges(void){

1496

error_t old_errno = errno;

1497

error_t ret_errno = 0;

1498

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

1499

ret_errno = errno;

1500

}

1501

errno = old_errno;

1502

return ret_errno;

1503

}

1504

1505

/* Lower privileges permanently */

1506

__attribute__((warn_unused_result))

1507

error_t lower_privileges_permanently(void){

1508

error_t old_errno = errno;

1509

error_t ret_errno = 0;

1510

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

1511

ret_errno = errno;

1512

}

1513

errno = old_errno;

1514

return ret_errno;

1515

}

1516

1517

__attribute__((nonnull))

1518

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

1519

const float delay){

1520

struct dirent **direntries = NULL;

1521

if(hookdir_fd == -1){

1522

hookdir_fd = open(hookdir, O_RDONLY);

1523

if(hookdir_fd == -1){

1524

if(errno == ENOENT){

1525

if(debug){

1526

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

1527

" found\n", hookdir);

1528

}

1529

} else {

1530

perror_plus("open");

1531

}

1532

return;

1533

}

1534

}

1535

#ifdef __GLIBC__

1536

#if __GLIBC_PREREQ(2, 15)

1537

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

1538

runnable_hook, alphasort);

1539

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

1540

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

1541

alphasort);

1542

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

1543

#else /* not __GLIBC__ */

1544

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

1545

alphasort);

1546

#endif /* not __GLIBC__ */

1547

if(numhooks == -1){

1548

perror_plus("scandir");

1549

return;

1550

}

1551

struct dirent *direntry;

1552

int ret;

1553

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

1554

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

1555

direntry = direntries[i];

1556

if(debug){

1557

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

1558

direntry->d_name);

1559

}

1560

pid_t hook_pid = fork();

1561

if(hook_pid == 0){

1562

/* Child */

1563

/* Raise privileges */

1564

errno = raise_privileges_permanently();

1565

if(errno != 0){

1566

perror_plus("Failed to raise privileges");

1567

_exit(EX_NOPERM);

1568

}

1569

/* Set group */

1570

errno = 0;

1571

ret = setgid(0);

1572

if(ret == -1){

1573

perror_plus("setgid");

1574

_exit(EX_NOPERM);

1575

}

1576

/* Reset supplementary groups */

1577

errno = 0;

1578

ret = setgroups(0, NULL);

1579

if(ret == -1){

1580

perror_plus("setgroups");

1581

_exit(EX_NOPERM);

1582

}

1583

ret = dup2(devnull, STDIN_FILENO);

1584

if(ret == -1){

1585

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

1586

_exit(EX_OSERR);

1587

}

1588

ret = close(devnull);

1589

if(ret == -1){

1590

perror_plus("close");

1591

_exit(EX_OSERR);

1592

}

1593

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1594

if(ret == -1){

1595

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

1596

_exit(EX_OSERR);

1597

}

1598

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

1599

if(ret == -1){

1600

perror_plus("setenv");

1601

_exit(EX_OSERR);

1602

}

1603

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

1604

if(ret == -1){

1605

perror_plus("setenv");

1606

_exit(EX_OSERR);

1607

}

1608

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

1609

if(ret == -1){

1610

perror_plus("setenv");

1611

_exit(EX_OSERR);

1612

}

1613

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

1614

if(ret == -1){

1615

perror_plus("setenv");

1616

_exit(EX_OSERR);

1617

}

1618

char *delaystring;

1619

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

1620

if(ret == -1){

1621

perror_plus("asprintf");

1622

_exit(EX_OSERR);

1623

}

1624

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

1625

if(ret == -1){

1626

free(delaystring);

1627

perror_plus("setenv");

1628

_exit(EX_OSERR);

1629

}

1630

free(delaystring);

1631

if(connect_to != NULL){

1632

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

1633

if(ret == -1){

1634

perror_plus("setenv");

1635

_exit(EX_OSERR);

1636

}

1637

}

1638

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

1639

if(hook_fd == -1){

1640

perror_plus("openat");

1641

_exit(EXIT_FAILURE);

1642

}

1643

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

1644

perror_plus("close");

1645

_exit(EXIT_FAILURE);

1646

}

1647

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

1648

environ) == -1){

1649

perror_plus("fexecve");

1650

_exit(EXIT_FAILURE);

1651

}

1652

} else {

1653

int status;

1654

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

1655

perror_plus("waitpid");

1656

free(direntry);

1657

continue;

1658

}

1659

if(WIFEXITED(status)){

1660

if(WEXITSTATUS(status) != 0){

1661

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

1662

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

1663

WEXITSTATUS(status));

1664

free(direntry);

1665

continue;

1666

}

1667

} else if(WIFSIGNALED(status)){

1668

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

1669

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

1670

WTERMSIG(status));

1671

free(direntry);

1672

continue;

1673

} else {

1674

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

1675

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

1676

free(direntry);

1677

continue;

1678

}

1679

}

1680

if(debug){

1681

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

1682

direntry->d_name);

1683

}

1684

free(direntry);

1685

}

1686

free(direntries);

1687

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

1688

perror_plus("close");

1689

} else {

1690

hookdir_fd = -1;

1691

}

1692

close(devnull);

1693

}

1694

1695

__attribute__((nonnull, warn_unused_result))

1696

error_t bring_up_interface(const char *const interface,

1697

const float delay){

1698

error_t old_errno = errno;

1699

int ret;

1700

struct ifreq network;

1701

unsigned int if_index = if_nametoindex(interface);

1702

if(if_index == 0){

1703

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

1704

errno = old_errno;

1705

return ENXIO;

1706

}

1707

1708

if(quit_now){

1709

errno = old_errno;

1710

return EINTR;

1711

}

1712

1713

if(not interface_is_up(interface)){

1714

error_t ret_errno = 0, ioctl_errno = 0;

1715

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

1716

ret_errno = errno;

1717

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

1718

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

1719

errno = old_errno;

1720

return ret_errno;

1721

}

1722

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

1723

1724

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

1725

if(sd == -1){

1726

ret_errno = errno;

1727

perror_plus("socket");

1728

errno = old_errno;

1729

return ret_errno;

1730

}

1731

1732

if(quit_now){

1733

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

1734

if(ret == -1){

1735

perror_plus("close");

1736

}

1737

errno = old_errno;

1738

return EINTR;

1739

}

1740

1741

if(debug){

1742

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

1743

interface);

1744

}

1745

1746

/* Raise privileges */

1747

ret_errno = raise_privileges();

1748

if(ret_errno != 0){

1749

errno = ret_errno;

1750

perror_plus("Failed to raise privileges");

1751

}

1752

1753

#ifdef __linux__

1754

int ret_linux;

1755

bool restore_loglevel = false;

1756

if(ret_errno == 0){

1757

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1758

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

1759

ret_linux = klogctl(8, NULL, 5);

1760

if(ret_linux == -1){

1761

perror_plus("klogctl");

1762

} else {

1763

restore_loglevel = true;

1764

}

1765

}

1766

#endif /* __linux__ */

1767

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

1768

ioctl_errno = errno;

1769

#ifdef __linux__

1770

if(restore_loglevel){

1771

ret_linux = klogctl(7, NULL, 0);

1772

if(ret_linux == -1){

1773

perror_plus("klogctl");

1774

}

1775

}

1776

#endif /* __linux__ */

1777

1778

/* If raise_privileges() succeeded above */

1779

if(ret_errno == 0){

1780

/* Lower privileges */

1781

ret_errno = lower_privileges();

1782

if(ret_errno != 0){

1783

errno = ret_errno;

1784

perror_plus("Failed to lower privileges");

1785

}

1786

}

1787

1788

/* Close the socket */

1789

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

1790

if(ret == -1){

1791

perror_plus("close");

1792

}

1793

1794

if(ret_setflags == -1){

1795

errno = ioctl_errno;

1796

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1797

errno = old_errno;

1798

return ioctl_errno;

1799

}

1800

} else if(debug){

1801

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

1802

interface);

1803

}

1804

1805

/* Sleep checking until interface is running.

1806

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

1807

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

1808

if(interface_is_running(interface)){

1809

break;

1810

}

1811

struct timespec sleeptime = { .tv_nsec = 250000000 };

1812

ret = nanosleep(&sleeptime, NULL);

1813

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

1814

perror_plus("nanosleep");

1815

}

1816

}

1817

1818

errno = old_errno;

1819

return 0;

1820

}

1821

1822

__attribute__((nonnull, warn_unused_result))

1823

error_t take_down_interface(const char *const interface){

1824

error_t old_errno = errno;

1825

struct ifreq network;

1826

unsigned int if_index = if_nametoindex(interface);

1827

if(if_index == 0){

1828

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

1829

errno = old_errno;

1830

return ENXIO;

1831

}

1832

if(interface_is_up(interface)){

1833

error_t ret_errno = 0, ioctl_errno = 0;

1834

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

1835

ret_errno = errno;

1836

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

1837

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

1838

errno = old_errno;

1839

return ret_errno;

1840

}

1841

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

1842

1843

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

1844

if(sd == -1){

1845

ret_errno = errno;

1846

perror_plus("socket");

1847

errno = old_errno;

1848

return ret_errno;

1849

}

1850

1851

if(debug){

1852

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

1853

interface);

1854

}

1855

1856

/* Raise privileges */

1857

ret_errno = raise_privileges();

1858

if(ret_errno != 0){

1859

errno = ret_errno;

1860

perror_plus("Failed to raise privileges");

1861

}

1862

1863

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

1864

ioctl_errno = errno;

1865

1866

/* If raise_privileges() succeeded above */

1867

if(ret_errno == 0){

1868

/* Lower privileges */

1869

ret_errno = lower_privileges();

1870

if(ret_errno != 0){

1871

errno = ret_errno;

1872

perror_plus("Failed to lower privileges");

1873

}

1874

}

1875

1876

/* Close the socket */

1877

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

1878

if(ret == -1){

1879

perror_plus("close");

1880

}

1881

1882

if(ret_setflags == -1){

1883

errno = ioctl_errno;

1884

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1885

errno = old_errno;

1886

return ioctl_errno;

1887

}

1888

} else if(debug){

1889

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

1890

interface);

1891

}

1892

1893

errno = old_errno;

1894

return 0;

1017

if(mc.simple_poll != NULL){

1018

avahi_simple_poll_quit(mc.simple_poll);

1019

}

1020

errno = old_errno;

1895

1021

}

1896

1022

1897

1023

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

1898

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

1899

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

1900

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

1901

.interfaces = NULL, .interfaces_size = 0 };

1902

1024

AvahiSServiceBrowser *sb = NULL;

1903

error_t ret_errno;

1025

int error;

1904

1026

int ret;

1905

1027

intmax_t tmpmax;

1906

1028

char *tmp;

1907

1029

int exitcode = EXIT_SUCCESS;

1908

char *interfaces_to_take_down = NULL;

1909

size_t interfaces_to_take_down_size = 0;

1910

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

1911

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

1912

char *tempdir = NULL;

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;

1913

1039

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1914

1040

const char *seckey = PATHDIR "/" SECKEY;

1915

1041

const char *pubkey = PATHDIR "/" PUBKEY;

1916

char *interfaces_hooks = NULL;

1917

1042

1918

1043

bool gnutls_initialized = false;

1919

1044

bool gpgme_initialized = false;

1920

1045

float delay = 2.5f;

1921

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

1922

retrying the same server again */

1923

1046

1924

1047

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1925

1048

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1931

1054

errno = 0;

1932

1055

ret = setgid(gid);

1933

1056

if(ret == -1){

1934

perror_plus("setgid");

1057

perror("setgid");

1935

1058

}

1936

1059

1937

1060

/* Lower user privileges (temporarily) */

1938

1061

errno = 0;

1939

1062

ret = seteuid(uid);

1940

1063

if(ret == -1){

1941

perror_plus("seteuid");

1064

perror("seteuid");

1942

1065

}

1943

1066

1944

1067

if(quit_now){

1979

1102

.arg = "SECONDS",

1980

1103

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

1981

1104

.group = 2 },

1982

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

1983

.arg = "SECONDS",

1984

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

1985

.group = 2 },

1986

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

1987

.arg = "DIR",

1988

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

1989

.group = 2 },

1990

1105

/*

1991

1106

* These reproduce what we would get without ARGP_NO_HELP

1992

1107

*/

2010

1125

connect_to = arg;

2011

1126

break;

2012

1127

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

2013

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

2014

arg, (int)',');

2015

if(ret_errno != 0){

2016

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

2017

}

1128

interface = arg;

2018

1129

break;

2019

1130

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

2020

1131

seckey = arg;

2040

1151

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

2041

1152

argp_error(state, "Bad delay");

2042

1153

}

2043

case 132: /* --retry */

2044

errno = 0;

2045

retry_interval = strtod(arg, &tmp);

2046

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

2047

or (retry_interval * 1000) > INT_MAX

2048

or retry_interval < 0){

2049

argp_error(state, "Bad retry interval");

2050

}

2051

break;

2052

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

2053

hookdir = arg;

2054

1154

break;

2055

1155

/*

2056

1156

* These reproduce what we would get without ARGP_NO_HELP

2063

1163

argp_state_help(state, state->out_stream,

2064

1164

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

2065

1165

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

2066

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

1166

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

2067

1167

exit(argp_err_exit_status);

2068

1168

break;

2069

1169

default:

2084

1184

case ENOMEM:

2085

1185

default:

2086

1186

errno = ret;

2087

perror_plus("argp_parse");

1187

perror("argp_parse");

2088

1188

exitcode = EX_OSERR;

2089

1189

goto end;

2090

1190

case EINVAL:

2092

1192

goto end;

2093

1193

}

2094

1194

}

2095

2096

{

2097

/* Work around Debian bug #633582:

2098

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

2099

2100

/* Re-raise privileges */

2101

ret_errno = raise_privileges();

2102

if(ret_errno != 0){

2103

errno = ret_errno;

2104

perror_plus("Failed to raise privileges");

2105

} else {

2106

struct stat st;

2107

2108

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

2109

int seckey_fd = open(seckey, O_RDONLY);

2110

if(seckey_fd == -1){

2111

perror_plus("open");

2112

} else {

2113

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

2114

if(ret == -1){

2115

perror_plus("fstat");

2116

} else {

2117

if(S_ISREG(st.st_mode)

2118

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

2119

ret = fchown(seckey_fd, uid, gid);

2120

if(ret == -1){

2121

perror_plus("fchown");

2122

}

2123

}

2124

}

2125

TEMP_FAILURE_RETRY(close(seckey_fd));

2126

}

2127

}

2128

2129

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

2130

int pubkey_fd = open(pubkey, O_RDONLY);

2131

if(pubkey_fd == -1){

2132

perror_plus("open");

2133

} else {

2134

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

2135

if(ret == -1){

2136

perror_plus("fstat");

2137

} else {

2138

if(S_ISREG(st.st_mode)

2139

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

2140

ret = fchown(pubkey_fd, uid, gid);

2141

if(ret == -1){

2142

perror_plus("fchown");

2143

}

2144

}

2145

}

2146

TEMP_FAILURE_RETRY(close(pubkey_fd));

2147

}

2148

}

2149

2150

/* Lower privileges */

2151

ret_errno = lower_privileges();

2152

if(ret_errno != 0){

2153

errno = ret_errno;

2154

perror_plus("Failed to lower privileges");

2155

}

2156

}

2157

}

2158

2159

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

2160

{

2161

char *interface = NULL;

2162

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

2163

interface))){

2164

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

2165

and if_nametoindex(interface) == 0){

2166

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

2167

fprintf_plus(stderr, "Not using nonexisting interface"

2168

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

2169

}

2170

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

2171

interface = NULL;

2172

}

2173

}

2174

}

2175

2176

/* Run network hooks */

2177

{

2178

if(mc.interfaces != NULL){

2179

interfaces_hooks = malloc(mc.interfaces_size);

2180

if(interfaces_hooks == NULL){

2181

perror_plus("malloc");

2182

goto end;

2183

}

2184

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

2185

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

2186

}

2187

run_network_hooks("start", interfaces_hooks != NULL ?

2188

interfaces_hooks : "", delay);

2189

}

2190

1195

2191

1196

if(not debug){

2192

1197

avahi_set_log_function(empty_log);

2196

1201

from the signal handler */

2197

1202

/* Initialize the pseudo-RNG for Avahi */

2198

1203

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

2199

simple_poll = avahi_simple_poll_new();

2200

if(simple_poll == NULL){

2201

fprintf_plus(stderr,

2202

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

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");

2203

1207

exitcode = EX_UNAVAILABLE;

2204

1208

goto end;

2205

1209

}

2207

1211

sigemptyset(&sigterm_action.sa_mask);

2208

1212

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

2209

1213

if(ret == -1){

2210

perror_plus("sigaddset");

1214

perror("sigaddset");

2211

1215

exitcode = EX_OSERR;

2212

1216

goto end;

2213

1217

}

2214

1218

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

2215

1219

if(ret == -1){

2216

perror_plus("sigaddset");

1220

perror("sigaddset");

2217

1221

exitcode = EX_OSERR;

2218

1222

goto end;

2219

1223

}

2220

1224

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

2221

1225

if(ret == -1){

2222

perror_plus("sigaddset");

1226

perror("sigaddset");

2223

1227

exitcode = EX_OSERR;

2224

1228

goto end;

2225

1229

}

2229

1233

*/

2230

1234

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

2231

1235

if(ret == -1){

2232

perror_plus("sigaction");

1236

perror("sigaction");

2233

1237

return EX_OSERR;

2234

1238

}

2235

1239

if(old_sigterm_action.sa_handler != SIG_IGN){

2236

1240

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

2237

1241

if(ret == -1){

2238

perror_plus("sigaction");

1242

perror("sigaction");

2239

1243

exitcode = EX_OSERR;

2240

1244

goto end;

2241

1245

}

2242

1246

}

2243

1247

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

2244

1248

if(ret == -1){

2245

perror_plus("sigaction");

1249

perror("sigaction");

2246

1250

return EX_OSERR;

2247

1251

}

2248

1252

if(old_sigterm_action.sa_handler != SIG_IGN){

2249

1253

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

2250

1254

if(ret == -1){

2251

perror_plus("sigaction");

1255

perror("sigaction");

2252

1256

exitcode = EX_OSERR;

2253

1257

goto end;

2254

1258

}

2255

1259

}

2256

1260

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

2257

1261

if(ret == -1){

2258

perror_plus("sigaction");

1262

perror("sigaction");

2259

1263

return EX_OSERR;

2260

1264

}

2261

1265

if(old_sigterm_action.sa_handler != SIG_IGN){

2262

1266

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

2263

1267

if(ret == -1){

2264

perror_plus("sigaction");

1268

perror("sigaction");

2265

1269

exitcode = EX_OSERR;

2266

1270

goto end;

2267

1271

}

2268

1272

}

2269

1273

2270

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

2271

if(mc.interfaces == NULL){

2272

struct dirent **direntries = NULL;

2273

/* Look for any good interfaces */

2274

ret = scandir(sys_class_net, &direntries, good_interface,

2275

alphasort);

2276

if(ret >= 1){

2277

/* Add all found interfaces to interfaces list */

2278

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

2279

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

2280

direntries[i]->d_name);

2281

if(ret_errno != 0){

2282

errno = ret_errno;

2283

perror_plus("argz_add");

2284

free(direntries[i]);

2285

continue;

2286

}

2287

if(debug){

2288

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

2289

direntries[i]->d_name);

2290

}

2291

free(direntries[i]);

2292

}

2293

free(direntries);

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");

1359

}

1360

}

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

break;

1378

}

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

}

2294

1409

} else {

2295

if(ret == 0){

2296

free(direntries);

2297

}

2298

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

2299

exitcode = EXIT_FAILURE;

2300

goto end;

2301

}

2302

}

2303

2304

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

2305

{

2306

char *interface = NULL;

2307

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

2308

interface))){

2309

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

2310

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

2311

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

2312

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

2313

interface);

2314

interface = NULL;

2315

while((interface = argz_next(mc.interfaces,

2316

mc.interfaces_size, interface))){

2317

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

2318

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

2319

interface);

2320

interface = NULL;

2321

}

2322

}

2323

break;

2324

}

2325

bool interface_was_up = interface_is_up(interface);

2326

errno = bring_up_interface(interface, delay);

2327

if(not interface_was_up){

2328

if(errno != 0){

2329

perror_plus("Failed to bring up interface");

2330

} else {

2331

errno = argz_add(&interfaces_to_take_down,

2332

&interfaces_to_take_down_size,

2333

interface);

2334

if(errno != 0){

2335

perror_plus("argz_add");

2336

}

2337

}

2338

}

2339

}

2340

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

2341

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

2342

}

2343

}

2344

2345

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

2346

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

2347

if(debug){

2348

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

2349

mc.interfaces);

2350

}

2351

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

1410

/* Lower privileges permanently */

1411

ret = setuid(uid);

1412

if(ret == -1){

1413

perror("setuid");

1414

}

1415

}

2352

1416

}

2353

1417

2354

1418

if(quit_now){

2355

1419

goto end;

2356

1420

}

2357

1421

2358

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

1422

ret = init_gnutls_global(pubkey, seckey);

2359

1423

if(ret == -1){

2360

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

1424

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

2361

1425

exitcode = EX_UNAVAILABLE;

2362

1426

goto end;

2363

1427

} else {

2368

1432

goto end;

2369

1433

}

2370

1434

2371

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

2372

tempdir = mkdtemp(run_tempdir);

2373

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

2374

if(debug){

2375

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

2376

run_tempdir, old_tempdir);

2377

}

2378

tempdir = mkdtemp(old_tempdir);

2379

}

2380

if(tempdir == NULL){

2381

perror_plus("mkdtemp");

1435

tempdir_created = true;

1436

if(mkdtemp(tempdir) == NULL){

1437

tempdir_created = false;

1438

perror("mkdtemp");

2382

1439

goto end;

2383

1440

}

2384

1441

2386

1443

goto end;

2387

1444

}

2388

1445

2389

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

2390

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

1446

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

1447

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

2391

1448

exitcode = EX_UNAVAILABLE;

2392

1449

goto end;

2393

1450

} else {

2402

1459

/* Connect directly, do not use Zeroconf */

2403

1460

/* (Mainly meant for debugging) */

2404

1461

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

2405

2406

1462

if(address == NULL){

2407

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

1463

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

2408

1464

exitcode = EX_USAGE;

2409

1465

goto end;

2410

1466

}

2413

1469

goto end;

2414

1470

}

2415

1471

2416

in_port_t port;

1472

uint16_t port;

2417

1473

errno = 0;

2418

1474

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

2419

1475

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

2420

or tmpmax != (in_port_t)tmpmax){

2421

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

1476

or tmpmax != (uint16_t)tmpmax){

1477

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

2422

1478

exitcode = EX_USAGE;

2423

1479

goto end;

2424

1480

}

2425

1481

2426

1482

if(quit_now){

2427

1483

goto end;

2428

1484

}

2429

1485

2430

port = (in_port_t)tmpmax;

1486

port = (uint16_t)tmpmax;

2431

1487

*address = '\0';

1488

address = connect_to;

2432

1489

/* Colon in address indicates IPv6 */

2433

1490

int af;

2434

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

1491

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

2435

1492

af = AF_INET6;

2436

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

2437

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

2438

{

2439

connect_to++;

2440

address[-1] = '\0';

2441

}

2442

1493

} else {

2443

1494

af = AF_INET;

2444

1495

}

2445

address = connect_to;

2446

1496

2447

1497

if(quit_now){

2448

1498

goto end;

2449

1499

}

2450

1500

2451

while(not quit_now){

2452

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

2453

&mc);

2454

if(quit_now or ret == 0){

2455

break;

2456

}

2457

if(debug){

2458

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

2459

(int)retry_interval);

2460

}

2461

sleep((unsigned int)retry_interval);

2462

}

2463

2464

if(not quit_now){

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 {

2465

1523

exitcode = EXIT_SUCCESS;

2466

1524

}

2467

2468

1525

goto end;

2469

1526

}

2470

1527

2482

1539

config.publish_domain = 0;

2483

1540

2484

1541

/* Allocate a new server */

2485

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2486

&config, NULL, NULL, &ret_errno);

1542

mc.server = avahi_server_new(avahi_simple_poll_get

1543

(mc.simple_poll), &config, NULL,

1544

NULL, &error);

2487

1545

2488

1546

/* Free the Avahi configuration data */

2489

1547

avahi_server_config_free(&config);

2491

1549

2492

1550

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

2493

1551

if(mc.server == NULL){

2494

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

2495

avahi_strerror(ret_errno));

1552

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

1553

avahi_strerror(error));

2496

1554

exitcode = EX_UNAVAILABLE;

2497

1555

goto end;

2498

1556

}

2504

1562

/* Create the Avahi service browser */

2505

1563

sb = avahi_s_service_browser_new(mc.server, if_index,

2506

1564

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2507

NULL, 0, browse_callback,

2508

(void *)&mc);

1565

NULL, 0, browse_callback, NULL);

2509

1566

if(sb == NULL){

2510

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

2511

avahi_strerror(avahi_server_errno(mc.server)));

1567

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

1568

avahi_strerror(avahi_server_errno(mc.server)));

2512

1569

exitcode = EX_UNAVAILABLE;

2513

1570

goto end;

2514

1571

}

2520

1577

/* Run the main loop */

2521

1578

2522

1579

if(debug){

2523

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

1580

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

2524

1581

}

2525

1582

2526

ret = avahi_loop_with_timeout(simple_poll,

2527

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

2528

if(debug){

2529

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

2530

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

2531

}

1583

avahi_simple_poll_loop(mc.simple_poll);

2532

1584

2533

1585

end:

2534

1586

2535

1587

if(debug){

2536

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

1588

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

2537

1589

}

2538

1590

2539

1591

/* Cleanup things */

2540

free(mc.interfaces);

2541

2542

1592

if(sb != NULL)

2543

1593

avahi_s_service_browser_free(sb);

2544

1594

2545

1595

if(mc.server != NULL)

2546

1596

avahi_server_free(mc.server);

2547

1597

2548

if(simple_poll != NULL)

2549

avahi_simple_poll_free(simple_poll);

1598

if(mc.simple_poll != NULL)

1599

avahi_simple_poll_free(mc.simple_poll);

2550

1600

2551

1601

if(gnutls_initialized){

2552

1602

gnutls_certificate_free_credentials(mc.cred);

2558

1608

gpgme_release(mc.ctx);

2559

1609

}

2560

1610

2561

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

2562

has seen */

2563

if(mc.current_server != NULL){

2564

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

2565

while(mc.current_server != NULL){

2566

server *next = mc.current_server->next;

2567

#ifdef __GNUC__

2568

#pragma GCC diagnostic push

2569

#pragma GCC diagnostic ignored "-Wcast-qual"

2570

#endif

2571

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

2572

#ifdef __GNUC__

2573

#pragma GCC diagnostic pop

2574

#endif

2575

free(mc.current_server);

2576

mc.current_server = next;

2577

}

2578

}

2579

2580

/* Re-raise privileges */

2581

{

2582

ret_errno = raise_privileges();

2583

if(ret_errno != 0){

2584

errno = ret_errno;

2585

perror_plus("Failed to raise privileges");

2586

} else {

2587

2588

/* Run network hooks */

2589

run_network_hooks("stop", interfaces_hooks != NULL ?

2590

interfaces_hooks : "", delay);

2591

2592

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

2593

{

2594

char *interface = NULL;

2595

while((interface=argz_next(interfaces_to_take_down,

2596

interfaces_to_take_down_size,

2597

interface))){

2598

ret_errno = take_down_interface(interface);

2599

if(ret_errno != 0){

2600

errno = ret_errno;

2601

perror_plus("Failed to take down interface");

2602

}

2603

}

2604

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

2605

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

2606

" down\n");

2607

}

2608

}

2609

}

2610

2611

ret_errno = lower_privileges_permanently();

2612

if(ret_errno != 0){

2613

errno = ret_errno;

2614

perror_plus("Failed to lower privileges permanently");

2615

}

2616

}

2617

2618

free(interfaces_to_take_down);

2619

free(interfaces_hooks);

2620

2621

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

2622

if(tempdir != NULL){

2623

struct dirent **direntries = NULL;

2624

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

2625

O_NOFOLLOW));

2626

if(tempdir_fd == -1){

2627

perror_plus("open");

2628

} else {

2629

#ifdef __GLIBC__

2630

#if __GLIBC_PREREQ(2, 15)

2631

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

2632

notdotentries, alphasort);

2633

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

2634

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

2635

alphasort);

2636

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

2637

#else /* not __GLIBC__ */

2638

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

2639

alphasort);

2640

#endif /* not __GLIBC__ */

2641

if(numentries >= 0){

2642

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

2643

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

2644

if(ret == -1){

2645

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

2646

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

2647

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

2648

}

2649

free(direntries[i]);

2650

}

2651

2652

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

2653

free(direntries);

2654

if(numentries == -1){

2655

perror_plus("scandir");

2656

}

2657

ret = rmdir(tempdir);

2658

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

2659

perror_plus("rmdir");

2660

}

2661

}

2662

TEMP_FAILURE_RETRY(close(tempdir_fd));

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");

2663

1684

}

2664

1685

}

2665

1686

2670

1691

&old_sigterm_action,

2671

1692

NULL));

2672

1693

if(ret == -1){

2673

perror_plus("sigaction");

1694

perror("sigaction");

2674

1695

}

2675

1696

do {

2676

1697

ret = raise(signal_received);

2677

1698

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

2678

1699

if(ret != 0){

2679

perror_plus("raise");

1700

perror("raise");

2680

1701

abort();

2681

1702

}

2682

1703

TEMP_FAILURE_RETRY(pause());