/mandos/release : revision 237.22.1

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

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*

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* Everything else is

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*

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

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

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* along with this program. If not, see

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

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*

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

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

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*/

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

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

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stdout, ferror(), remove() */

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

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

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

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

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srand(), strtof() */

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

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strtof(), abort() */

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

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

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

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sockaddr_in6, PF_INET6,

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SOCK_STREAM, uid_t, gid_t, open(),

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opendir(), DIR */

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

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

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

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inet_pton(), connect() */

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

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

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strtoimax() */

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

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

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

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

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program_invocation_short_name */

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

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

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SIOCSIFFLAGS, if_indextoname(),

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if_nametoindex(), IF_NAMESIZE */

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INET_ADDRSTRLEN, INET6_ADDRSTRLEN

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*/

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

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getuid(), getgid(), setuid(),

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setgid() */

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

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

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

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

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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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argp_parse(), ARGP_KEY_ARG,

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ARGP_KEY_END, ARGP_ERR_UNKNOWN */

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#include <signal.h> /* sigemptyset(), sigaddset(),

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sigaction(), SIGTERM, sigaction,

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sig_atomic_t */

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sigaction(), SIGTERM, sig_atomic_t,

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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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#ifdef __linux__

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93

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

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111

init_gnutls_session(),

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112

GNUTLS_* */

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113

#include <gnutls/openpgp.h>

108

/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* GPGME */

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118

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

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126

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

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127

#define SECKEY "seckey.txt"

122

128

#define PUBKEY "pubkey.txt"

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

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130

124

131

bool debug = false;

125

132

static const char mandos_protocol_version[] = "1";

126

133

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

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

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

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

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char *connect_to = NULL;

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const char *hookdir = HOOKDIR;

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uid_t uid = 65534;

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gid_t gid = 65534;

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

142

typedef struct server{

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const char *ip;

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uint16_t port;

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AvahiIfIndex if_index;

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int af;

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struct timespec last_seen;

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struct server *next;

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struct server *prev;

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} server;

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

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153

typedef struct {

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158

gnutls_dh_params_t dh_params;

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159

const char *priority;

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160

gpgme_ctx_t ctx;

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server *current_server;

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} mandos_context;

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163

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

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

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.dh_bits = 1024, .priority = "SECURE256"

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

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":!CTYPE-X.509:+CTYPE-OPENPGP",

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.current_server = NULL };

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170

sig_atomic_t quit_now = 0;

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int signal_received = 0;

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/* Function to use when printing errors */

174

void perror_plus(const char *print_text){

175

int e = errno;

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

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program_invocation_short_name);

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errno = e;

179

perror(print_text);

180

}

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182

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

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

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va_list ap;

185

va_start (ap, format);

186

187

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

188

program_invocation_short_name));

189

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

190

}

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191

145

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/*

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193

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

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195

* "buffer_length" is how much is already used.

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196

*/

150

197

size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

198

size_t buffer_capacity){

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199

if(buffer_length + BUFFER_SIZE > buffer_capacity){

153

200

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

154

201

if(buffer == NULL){

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206

return buffer_capacity;

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207

}

161

208

209

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

210

bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,

211

int af){

212

int ret;

213

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

214

if(new_server == NULL){

215

perror_plus("malloc");

216

return false;

217

}

218

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

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.port = port,

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.if_index = if_index,

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.af = af };

222

if(new_server->ip == NULL){

223

perror_plus("strdup");

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return false;

225

}

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/* Special case of first server */

227

if (mc.current_server == NULL){

228

new_server->next = new_server;

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new_server->prev = new_server;

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mc.current_server = new_server;

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

232

} else {

233

new_server->next = mc.current_server;

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new_server->prev = mc.current_server->prev;

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new_server->prev->next = new_server;

236

mc.current_server->prev = new_server;

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}

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ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);

239

if(ret == -1){

240

perror_plus("clock_gettime");

241

return false;

242

}

243

return true;

244

}

245

162

246

/*

163

247

* Initialize GPGME.

164

248

*/

165

static bool init_gpgme(const char *seckey,

166

const char *pubkey, const char *tempdir){

167

int ret;

249

static bool init_gpgme(const char *seckey, const char *pubkey,

250

const char *tempdir){

168

251

gpgme_error_t rc;

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252

gpgme_engine_info_t engine_info;

170

253

173

256

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

174

257

*/

175

258

bool import_key(const char *filename){

259

int ret;

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260

int fd;

177

261

gpgme_data_t pgp_data;

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262

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

180

264

if(fd == -1){

181

perror("open");

265

perror_plus("open");

182

266

return false;

183

267

}

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268

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269

rc = gpgme_data_new_from_fd(&pgp_data, fd);

186

270

if(rc != GPG_ERR_NO_ERROR){

187

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

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gpgme_strsource(rc), gpgme_strerror(rc));

271

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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return false;

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274

}

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rc = gpgme_op_import(mc.ctx, pgp_data);

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277

if(rc != GPG_ERR_NO_ERROR){

194

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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281

}

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

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284

if(ret == -1){

201

perror("close");

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perror_plus("close");

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286

}

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gpgme_data_release(pgp_data);

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return true;

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}

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if(debug){

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

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

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}

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/* Init GPGME */

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gpgme_check_version(NULL);

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rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

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298

if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

299

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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302

}

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

304

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

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305

rc = gpgme_get_engine_info(&engine_info);

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306

if(rc != GPG_ERR_NO_ERROR){

223

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

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gpgme_strsource(rc), gpgme_strerror(rc));

307

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

308

gpgme_strsource(rc), gpgme_strerror(rc));

225

309

return false;

226

310

}

227

311

while(engine_info != NULL){

233

317

engine_info = engine_info->next;

234

318

}

235

319

if(engine_info == NULL){

236

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

320

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

321

tempdir);

237

322

return false;

238

323

}

239

324

240

325

/* Create new GPGME "context" */

241

326

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

242

327

if(rc != GPG_ERR_NO_ERROR){

243

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

244

gpgme_strsource(rc), gpgme_strerror(rc));

328

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

329

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

330

gpgme_strerror(rc));

245

331

return false;

246

332

}

247

333

249

335

return false;

250

336

}

251

337

252

return true;

338

return true;

253

339

}

254

340

255

341

/*

266

352

ssize_t plaintext_length = 0;

267

353

268

354

if(debug){

269

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

355

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

270

356

}

271

357

272

358

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

273

359

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

274

360

0);

275

361

if(rc != GPG_ERR_NO_ERROR){

276

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

277

gpgme_strsource(rc), gpgme_strerror(rc));

362

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

363

gpgme_strsource(rc), gpgme_strerror(rc));

278

364

return -1;

279

365

}

280

366

281

367

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

282

368

rc = gpgme_data_new(&dh_plain);

283

369

if(rc != GPG_ERR_NO_ERROR){

284

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

285

gpgme_strsource(rc), gpgme_strerror(rc));

370

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

371

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

372

gpgme_strsource(rc), gpgme_strerror(rc));

286

373

gpgme_data_release(dh_crypto);

287

374

return -1;

288

375

}

291

378

data buffer */

292

379

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

293

380

if(rc != GPG_ERR_NO_ERROR){

294

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

295

gpgme_strsource(rc), gpgme_strerror(rc));

381

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

382

gpgme_strsource(rc), gpgme_strerror(rc));

296

383

plaintext_length = -1;

297

384

if(debug){

298

385

gpgme_decrypt_result_t result;

299

386

result = gpgme_op_decrypt_result(mc.ctx);

300

387

if(result == NULL){

301

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

388

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

302

389

} else {

303

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

304

result->unsupported_algorithm);

305

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

306

result->wrong_key_usage);

390

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

391

result->unsupported_algorithm);

392

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

393

result->wrong_key_usage);

307

394

if(result->file_name != NULL){

308

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

395

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

309

396

}

310

397

gpgme_recipient_t recipient;

311

398

recipient = result->recipients;

312

399

while(recipient != NULL){

313

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

314

gpgme_pubkey_algo_name(recipient->pubkey_algo));

315

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

316

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

317

recipient->status == GPG_ERR_NO_SECKEY

318

? "No" : "Yes");

400

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

401

gpgme_pubkey_algo_name

402

(recipient->pubkey_algo));

403

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

404

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

405

recipient->status == GPG_ERR_NO_SECKEY

406

? "No" : "Yes");

319

407

recipient = recipient->next;

320

408

}

321

409

}

324

412

}

325

413

326

414

if(debug){

327

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

415

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

328

416

}

329

417

330

418

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

331

419

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

332

perror("gpgme_data_seek");

420

perror_plus("gpgme_data_seek");

333

421

plaintext_length = -1;

334

422

goto decrypt_end;

335

423

}

337

425

*plaintext = NULL;

338

426

while(true){

339

427

plaintext_capacity = incbuffer(plaintext,

340

(size_t)plaintext_length,

341

plaintext_capacity);

428

(size_t)plaintext_length,

429

plaintext_capacity);

342

430

if(plaintext_capacity == 0){

343

perror("incbuffer");

344

plaintext_length = -1;

345

goto decrypt_end;

431

perror_plus("incbuffer");

432

plaintext_length = -1;

433

goto decrypt_end;

346

434

}

347

435

348

436

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

353

441

break;

354

442

}

355

443

if(ret < 0){

356

perror("gpgme_data_read");

444

perror_plus("gpgme_data_read");

357

445

plaintext_length = -1;

358

446

goto decrypt_end;

359

447

}

361

449

}

362

450

363

451

if(debug){

364

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

452

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

365

453

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

366

454

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

367

455

}

389

477

/* GnuTLS log function callback */

390

478

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

391

479

const char* string){

392

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

480

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

393

481

}

394

482

395

483

static int init_gnutls_global(const char *pubkeyfilename,

397

485

int ret;

398

486

399

487

if(debug){

400

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

488

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

401

489

}

402

490

403

491

ret = gnutls_global_init();

404

492

if(ret != GNUTLS_E_SUCCESS){

405

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

406

safer_gnutls_strerror(ret));

493

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

494

safer_gnutls_strerror(ret));

407

495

return -1;

408

496

}

409

497

416

504

}

417

505

418

506

/* OpenPGP credentials */

419

gnutls_certificate_allocate_credentials(&mc.cred);

507

ret = gnutls_certificate_allocate_credentials(&mc.cred);

420

508

if(ret != GNUTLS_E_SUCCESS){

421

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

422

from

423

-Wunreachable-code

424

*/

425

safer_gnutls_strerror(ret));

509

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

510

safer_gnutls_strerror(ret));

426

511

gnutls_global_deinit();

427

512

return -1;

428

513

}

429

514

430

515

if(debug){

431

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

432

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

433

seckeyfilename);

516

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

517

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

518

pubkeyfilename,

519

seckeyfilename);

434

520

}

435

521

436

522

ret = gnutls_certificate_set_openpgp_key_file

437

523

(mc.cred, pubkeyfilename, seckeyfilename,

438

524

GNUTLS_OPENPGP_FMT_BASE64);

439

525

if(ret != GNUTLS_E_SUCCESS){

440

fprintf(stderr,

441

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

442

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

443

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

444

safer_gnutls_strerror(ret));

526

fprintf_plus(stderr,

527

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

528

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

529

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

530

safer_gnutls_strerror(ret));

445

531

goto globalfail;

446

532

}

447

533

448

534

/* GnuTLS server initialization */

449

535

ret = gnutls_dh_params_init(&mc.dh_params);

450

536

if(ret != GNUTLS_E_SUCCESS){

451

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

452

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

537

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

538

" initialization: %s\n",

539

safer_gnutls_strerror(ret));

453

540

goto globalfail;

454

541

}

455

542

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

456

543

if(ret != GNUTLS_E_SUCCESS){

457

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

458

safer_gnutls_strerror(ret));

544

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

545

safer_gnutls_strerror(ret));

459

546

goto globalfail;

460

547

}

461

548

474

561

static int init_gnutls_session(gnutls_session_t *session){

475

562

int ret;

476

563

/* GnuTLS session creation */

477

ret = gnutls_init(session, GNUTLS_SERVER);

564

do {

565

ret = gnutls_init(session, GNUTLS_SERVER);

566

if(quit_now){

567

return -1;

568

}

569

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

478

570

if(ret != GNUTLS_E_SUCCESS){

479

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

480

safer_gnutls_strerror(ret));

571

fprintf_plus(stderr,

572

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

573

safer_gnutls_strerror(ret));

481

574

}

482

575

483

576

{

484

577

const char *err;

485

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

578

do {

579

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

580

if(quit_now){

581

gnutls_deinit(*session);

582

return -1;

583

}

584

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

486

585

if(ret != GNUTLS_E_SUCCESS){

487

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

488

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

489

safer_gnutls_strerror(ret));

586

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

587

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

588

safer_gnutls_strerror(ret));

490

589

gnutls_deinit(*session);

491

590

return -1;

492

591

}

493

592

}

494

593

495

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

496

mc.cred);

594

do {

595

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

596

mc.cred);

597

if(quit_now){

598

gnutls_deinit(*session);

599

return -1;

600

}

601

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

497

602

if(ret != GNUTLS_E_SUCCESS){

498

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

499

safer_gnutls_strerror(ret));

603

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

604

safer_gnutls_strerror(ret));

500

605

gnutls_deinit(*session);

501

606

return -1;

502

607

}

503

608

504

609

/* ignore client certificate if any. */

505

gnutls_certificate_server_set_request(*session,

506

GNUTLS_CERT_IGNORE);

610

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

507

611

508

612

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

509

613

518

622

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

519

623

AvahiIfIndex if_index,

520

624

int af){

521

int ret, tcp_sd;

625

int ret, tcp_sd = -1;

522

626

ssize_t sret;

523

627

union {

524

628

struct sockaddr_in in;

525

629

struct sockaddr_in6 in6;

526

630

} to;

527

631

char *buffer = NULL;

528

char *decrypted_buffer;

632

char *decrypted_buffer = NULL;

529

633

size_t buffer_length = 0;

530

634

size_t buffer_capacity = 0;

531

ssize_t decrypted_buffer_size;

532

635

size_t written;

533

int retval = 0;

636

int retval = -1;

534

637

gnutls_session_t session;

535

638

int pf; /* Protocol family */

536

639

640

errno = 0;

641

642

if(quit_now){

643

errno = EINTR;

644

return -1;

645

}

646

537

647

switch(af){

538

648

case AF_INET6:

539

649

pf = PF_INET6;

542

652

pf = PF_INET;

543

653

break;

544

654

default:

545

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

655

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

656

errno = EINVAL;

546

657

return -1;

547

658

}

548

659

552

663

}

553

664

554

665

if(debug){

555

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

556

"\n", ip, port);

666

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

667

PRIu16 "\n", ip, port);

557

668

}

558

669

559

670

tcp_sd = socket(pf, SOCK_STREAM, 0);

560

671

if(tcp_sd < 0){

561

perror("socket");

562

return -1;

672

int e = errno;

673

perror_plus("socket");

674

errno = e;

675

goto mandos_end;

676

}

677

678

if(quit_now){

679

errno = EINTR;

680

goto mandos_end;

563

681

}

564

682

565

683

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

571

689

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

572

690

}

573

691

if(ret < 0 ){

574

perror("inet_pton");

575

return -1;

692

int e = errno;

693

perror_plus("inet_pton");

694

errno = e;

695

goto mandos_end;

576

696

}

577

697

if(ret == 0){

578

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

579

return -1;

698

int e = errno;

699

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

700

errno = e;

701

goto mandos_end;

580

702

}

581

703

if(af == AF_INET6){

582

704

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

585

707

586

708

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

587

709

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

588

-Wunreachable-code*/

710

-Wunreachable-code*/

589

711

if(if_index == AVAHI_IF_UNSPEC){

590

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

591

" without a network interface\n");

592

return -1;

712

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

713

" incomplete without a network interface\n");

714

errno = EINVAL;

715

goto mandos_end;

593

716

}

594

717

/* Set the network interface number as scope */

595

718

to.in6.sin6_scope_id = (uint32_t)if_index;

600

723

-Wunreachable-code */

601

724

}

602

725

726

if(quit_now){

727

errno = EINTR;

728

goto mandos_end;

729

}

730

603

731

if(debug){

604

732

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

605

733

char interface[IF_NAMESIZE];

606

734

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

607

perror("if_indextoname");

735

perror_plus("if_indextoname");

608

736

} else {

609

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

610

ip, interface, port);

737

fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16

738

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

611

739

}

612

740

} else {

613

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

614

port);

741

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

742

ip, port);

615

743

}

616

744

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

617

745

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

624

752

sizeof(addrstr));

625

753

}

626

754

if(pcret == NULL){

627

perror("inet_ntop");

755

perror_plus("inet_ntop");

628

756

} else {

629

757

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

630

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

758

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

631

759

}

632

760

}

633

761

}

634

762

763

if(quit_now){

764

errno = EINTR;

765

goto mandos_end;

766

}

767

635

768

if(af == AF_INET6){

636

769

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

637

770

} else {

638

771

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

639

772

}

640

773

if(ret < 0){

641

perror("connect");

642

return -1;

774

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

775

int e = errno;

776

perror_plus("connect");

777

errno = e;

778

}

779

goto mandos_end;

780

}

781

782

if(quit_now){

783

errno = EINTR;

784

goto mandos_end;

643

785

}

644

786

645

787

const char *out = mandos_protocol_version;

647

789

while(true){

648

790

size_t out_size = strlen(out);

649

791

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

650

out_size - written));

792

out_size - written));

651

793

if(ret == -1){

652

perror("write");

653

retval = -1;

794

int e = errno;

795

perror_plus("write");

796

errno = e;

654

797

goto mandos_end;

655

798

}

656

799

written += (size_t)ret;

664

807

break;

665

808

}

666

809

}

810

811

if(quit_now){

812

errno = EINTR;

813

goto mandos_end;

814

}

667

815

}

668

816

669

817

if(debug){

670

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

671

}

672

673

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

674

675

do{

818

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

819

}

820

821

if(quit_now){

822

errno = EINTR;

823

goto mandos_end;

824

}

825

826

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

827

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

828

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

829

gnutls_transport_set_ptr(session,

830

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

831

832

if(quit_now){

833

errno = EINTR;

834

goto mandos_end;

835

}

836

837

do {

676

838

ret = gnutls_handshake(session);

839

if(quit_now){

840

errno = EINTR;

841

goto mandos_end;

842

}

677

843

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

678

844

679

845

if(ret != GNUTLS_E_SUCCESS){

680

846

if(debug){

681

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

847

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

682

848

gnutls_perror(ret);

683

849

}

684

retval = -1;

850

errno = EPROTO;

685

851

goto mandos_end;

686

852

}

687

853

688

854

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

689

855

690

856

if(debug){

691

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

692

ip);

857

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

858

" %s\n", ip);

693

859

}

694

860

695

861

while(true){

862

863

if(quit_now){

864

errno = EINTR;

865

goto mandos_end;

866

}

867

696

868

buffer_capacity = incbuffer(&buffer, buffer_length,

697

buffer_capacity);

869

buffer_capacity);

698

870

if(buffer_capacity == 0){

699

perror("incbuffer");

700

retval = -1;

871

int e = errno;

872

perror_plus("incbuffer");

873

errno = e;

874

goto mandos_end;

875

}

876

877

if(quit_now){

878

errno = EINTR;

701

879

goto mandos_end;

702

880

}

703

881

712

890

case GNUTLS_E_AGAIN:

713

891

break;

714

892

case GNUTLS_E_REHANDSHAKE:

715

do{

893

do {

716

894

ret = gnutls_handshake(session);

895

896

if(quit_now){

897

errno = EINTR;

898

goto mandos_end;

899

}

717

900

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

718

901

if(ret < 0){

719

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

902

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

903

"***\n");

720

904

gnutls_perror(ret);

721

retval = -1;

905

errno = EPROTO;

722

906

goto mandos_end;

723

907

}

724

908

break;

725

909

default:

726

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

727

" encrypted session with Mandos server\n");

728

retval = -1;

910

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

911

" encrypted session with Mandos server\n");

729

912

gnutls_bye(session, GNUTLS_SHUT_RDWR);

913

errno = EIO;

730

914

goto mandos_end;

731

915

}

732

916

} else {

735

919

}

736

920

737

921

if(debug){

738

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

739

}

740

741

gnutls_bye(session, GNUTLS_SHUT_RDWR);

922

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

923

}

924

925

if(quit_now){

926

errno = EINTR;

927

goto mandos_end;

928

}

929

930

do {

931

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

932

if(quit_now){

933

errno = EINTR;

934

goto mandos_end;

935

}

936

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

742

937

743

938

if(buffer_length > 0){

744

decrypted_buffer_size = pgp_packet_decrypt(buffer,

745

buffer_length,

939

ssize_t decrypted_buffer_size;

940

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

746

941

&decrypted_buffer);

747

942

if(decrypted_buffer_size >= 0){

943

748

944

written = 0;

749

945

while(written < (size_t) decrypted_buffer_size){

946

if(quit_now){

947

errno = EINTR;

948

goto mandos_end;

949

}

950

750

951

ret = (int)fwrite(decrypted_buffer + written, 1,

751

952

(size_t)decrypted_buffer_size - written,

752

953

stdout);

753

954

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

955

int e = errno;

754

956

if(debug){

755

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

756

strerror(errno));

957

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

958

strerror(errno));

757

959

}

758

retval = -1;

759

break;

960

errno = e;

961

goto mandos_end;

760

962

}

761

963

written += (size_t)ret;

762

964

}

763

free(decrypted_buffer);

764

} else {

765

retval = -1;

965

retval = 0;

766

966

}

767

} else {

768

retval = -1;

769

967

}

770

968

771

969

/* Shutdown procedure */

772

970

773

971

mandos_end:

774

free(buffer);

775

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

776

if(ret == -1){

777

perror("close");

972

{

973

int e = errno;

974

free(decrypted_buffer);

975

free(buffer);

976

if(tcp_sd >= 0){

977

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

978

}

979

if(ret == -1){

980

if(e == 0){

981

e = errno;

982

}

983

perror_plus("close");

984

}

985

gnutls_deinit(session);

986

errno = e;

987

if(quit_now){

988

errno = EINTR;

989

retval = -1;

990

}

778

991

}

779

gnutls_deinit(session);

780

992

return retval;

781

993

}

782

994

799

1011

/* Called whenever a service has been resolved successfully or

800

1012

timed out */

801

1013

1014

if(quit_now){

1015

return;

1016

}

1017

802

1018

switch(event){

803

1019

default:

804

1020

case AVAHI_RESOLVER_FAILURE:

805

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

806

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

807

avahi_strerror(avahi_server_errno(mc.server)));

1021

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

1022

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

1023

domain,

1024

avahi_strerror(avahi_server_errno(mc.server)));

808

1025

break;

809

1026

810

1027

case AVAHI_RESOLVER_FOUND:

812

1029

char ip[AVAHI_ADDRESS_STR_MAX];

813

1030

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

814

1031

if(debug){

815

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

816

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

817

ip, (intmax_t)interface, port);

1032

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

1033

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

1034

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

818

1035

}

819

1036

int ret = start_mandos_communication(ip, port, interface,

820

1037

avahi_proto_to_af(proto));

821

1038

if(ret == 0){

822

1039

avahi_simple_poll_quit(mc.simple_poll);

1040

} else {

1041

if(not add_server(ip, port, interface,

1042

avahi_proto_to_af(proto))){

1043

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

1044

" list\n", name);

1045

}

823

1046

}

824

1047

}

825

1048

}

841

1064

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

842

1065

is removed from the LAN */

843

1066

1067

if(quit_now){

1068

return;

1069

}

1070

844

1071

switch(event){

845

1072

default:

846

1073

case AVAHI_BROWSER_FAILURE:

847

1074

848

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

849

avahi_strerror(avahi_server_errno(mc.server)));

1075

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

1076

avahi_strerror(avahi_server_errno(mc.server)));

850

1077

avahi_simple_poll_quit(mc.simple_poll);

851

1078

return;

852

1079

859

1086

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

860

1087

name, type, domain, protocol, 0,

861

1088

resolve_callback, NULL) == NULL)

862

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

863

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

1089

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

1090

" %s\n", name,

1091

avahi_strerror(avahi_server_errno(mc.server)));

864

1092

break;

865

1093

866

1094

case AVAHI_BROWSER_REMOVE:

869

1097

case AVAHI_BROWSER_ALL_FOR_NOW:

870

1098

case AVAHI_BROWSER_CACHE_EXHAUSTED:

871

1099

if(debug){

872

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

1100

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

1101

" searching...\n");

873

1102

}

874

1103

break;

875

1104

}

876

1105

}

877

1106

878

sig_atomic_t quit_now = 0;

879

880

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

881

static void handle_sigterm(__attribute__((unused)) int sig){

1107

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

1108

static void handle_sigterm(int sig){

882

1109

if(quit_now){

883

1110

return;

884

1111

}

885

1112

quit_now = 1;

1113

signal_received = sig;

886

1114

int old_errno = errno;

1115

/* set main loop to exit */

887

1116

if(mc.simple_poll != NULL){

888

1117

avahi_simple_poll_quit(mc.simple_poll);

889

1118

}

890

1119

errno = old_errno;

891

1120

}

892

1121

1122

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

1123

int ret;

1124

1125

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

1126

if(s < 0){

1127

perror_plus("socket");

1128

return false;

1129

}

1130

strcpy(ifr->ifr_name, ifname);

1131

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1132

if(ret == -1){

1133

if(debug){

1134

perror_plus("ioctl SIOCGIFFLAGS");

1135

}

1136

return false;

1137

}

1138

return true;

1139

}

1140

1141

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

1142

1143

/* Reject the loopback device */

1144

if(ifr->ifr_flags & IFF_LOOPBACK){

1145

if(debug){

1146

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

1147

ifname);

1148

}

1149

return false;

1150

}

1151

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

1152

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

1153

if(debug){

1154

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

1155

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

1156

}

1157

return true;

1158

}

1159

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

1160

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

1161

if(debug){

1162

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1163

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

1164

}

1165

return false;

1166

}

1167

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

1168

if(ifr->ifr_flags & IFF_NOARP){

1169

if(debug){

1170

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

1171

ifname);

1172

}

1173

return false;

1174

}

1175

1176

/* Accept this device */

1177

if(debug){

1178

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

1179

}

1180

return true;

1181

}

1182

1183

/*

1184

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

1185

* corresponds to an acceptable network device.

1186

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

1187

*/

1188

int good_interface(const struct dirent *if_entry){

1189

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

1190

return 0;

1191

}

1192

1193

struct ifreq ifr;

1194

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

1195

if(debug){

1196

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

1197

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

1198

}

1199

return 0;

1200

}

1201

1202

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

1203

return 0;

1204

}

1205

return 1;

1206

}

1207

1208

/*

1209

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

1210

* corresponds to an acceptable network device which is up.

1211

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

1212

*/

1213

int up_interface(const struct dirent *if_entry){

1214

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

1215

return 0;

1216

}

1217

1218

struct ifreq ifr;

1219

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

1220

if(debug){

1221

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

1222

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

1223

}

1224

return 0;

1225

}

1226

1227

/* Reject down interfaces */

1228

if(not (ifr.ifr_flags & IFF_UP)){

1229

if(debug){

1230

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

1231

if_entry->d_name);

1232

}

1233

return 0;

1234

}

1235

1236

/* Reject non-running interfaces */

1237

if(not (ifr.ifr_flags & IFF_RUNNING)){

1238

if(debug){

1239

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

1240

if_entry->d_name);

1241

}

1242

return 0;

1243

}

1244

1245

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

1246

return 0;

1247

}

1248

return 1;

1249

}

1250

1251

int notdotentries(const struct dirent *direntry){

1252

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

1253

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

1254

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

1255

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

1256

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

1257

return 0;

1258

}

1259

return 1;

1260

}

1261

1262

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

1263

int runnable_hook(const struct dirent *direntry){

1264

int ret;

1265

size_t sret;

1266

struct stat st;

1267

1268

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

1269

/* Empty name? */

1270

return 0;

1271

}

1272

1273

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

1274

"abcdefghijklmnopqrstuvwxyz"

1275

"0123456789"

1276

"_-");

1277

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

1278

/* Contains non-allowed characters */

1279

if(debug){

1280

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

1281

direntry->d_name);

1282

}

1283

return 0;

1284

}

1285

1286

char *fullname = NULL;

1287

ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);

1288

if(ret < 0){

1289

perror_plus("asprintf");

1290

return 0;

1291

}

1292

1293

ret = stat(fullname, &st);

1294

if(ret == -1){

1295

if(debug){

1296

perror_plus("Could not stat hook");

1297

}

1298

return 0;

1299

}

1300

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

1301

/* Not a regular file */

1302

if(debug){

1303

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

1304

direntry->d_name);

1305

}

1306

return 0;

1307

}

1308

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

1309

/* Not executable */

1310

if(debug){

1311

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

1312

direntry->d_name);

1313

}

1314

return 0;

1315

}

1316

if(debug){

1317

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

1318

direntry->d_name);

1319

}

1320

return 1;

1321

}

1322

1323

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1324

int ret;

1325

struct timespec now;

1326

struct timespec waited_time;

1327

intmax_t block_time;

1328

1329

while(true){

1330

if(mc.current_server == NULL){

1331

if (debug){

1332

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

1333

" No timeout!\n");

1334

}

1335

ret = avahi_simple_poll_iterate(s, -1);

1336

} else {

1337

if (debug){

1338

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

1339

" it, or wait\n");

1340

}

1341

/* the current time */

1342

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1343

if(ret == -1){

1344

perror_plus("clock_gettime");

1345

return -1;

1346

}

1347

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

1348

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

1349

waited_time.tv_sec = (now.tv_sec

1350

- mc.current_server->last_seen.tv_sec);

1351

waited_time.tv_nsec = (now.tv_nsec

1352

- mc.current_server->last_seen.tv_nsec);

1353

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

1354

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

1355

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

1356

block_time = ((retry_interval

1357

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

1358

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

1359

1360

if (debug){

1361

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

1362

block_time);

1363

}

1364

1365

if(block_time <= 0){

1366

ret = start_mandos_communication(mc.current_server->ip,

1367

mc.current_server->port,

1368

mc.current_server->if_index,

1369

mc.current_server->af);

1370

if(ret == 0){

1371

avahi_simple_poll_quit(mc.simple_poll);

1372

return 0;

1373

}

1374

ret = clock_gettime(CLOCK_MONOTONIC,

1375

&mc.current_server->last_seen);

1376

if(ret == -1){

1377

perror_plus("clock_gettime");

1378

return -1;

1379

}

1380

mc.current_server = mc.current_server->next;

1381

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

1382

servers, but don't block */

1383

}

1384

1385

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

1386

}

1387

if(ret != 0){

1388

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

1389

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

1390

}

1391

}

1392

}

1393

}

1394

1395

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

1396

int raise_privileges(void){

1397

int old_errno = errno;

1398

int ret_errno = 0;

1399

errno = 0;

1400

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

1401

perror_plus("seteuid");

1402

}

1403

ret_errno = errno;

1404

errno = old_errno;

1405

return ret_errno;

1406

}

1407

1408

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

1409

int raise_privileges_permanently(void){

1410

int old_errno = errno;

1411

int ret_errno = raise_privileges();

1412

if(ret_errno != 0){

1413

errno = old_errno;

1414

return ret_errno;

1415

}

1416

errno = 0;

1417

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

1418

perror_plus("seteuid");

1419

}

1420

ret_errno = errno;

1421

errno = old_errno;

1422

return ret_errno;

1423

}

1424

1425

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

1426

int lower_privileges(void){

1427

int old_errno = errno;

1428

int ret_errno = 0;

1429

errno = 0;

1430

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

1431

perror_plus("seteuid");

1432

}

1433

ret_errno = errno;

1434

errno = old_errno;

1435

return ret_errno;

1436

}

1437

1438

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

1439

const float delay){

1440

struct dirent **direntries;

1441

struct dirent *direntry;

1442

int ret;

1443

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

1444

alphasort);

1445

if(numhooks == -1){

1446

perror_plus("scandir");

1447

} else {

1448

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

1449

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

1450

direntry = direntries[i];

1451

char *fullname = NULL;

1452

ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);

1453

if(ret < 0){

1454

perror_plus("asprintf");

1455

continue;

1456

}

1457

if(debug){

1458

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

1459

direntry->d_name);

1460

}

1461

pid_t hook_pid = fork();

1462

if(hook_pid == 0){

1463

/* Child */

1464

/* Raise privileges */

1465

raise_privileges_permanently();

1466

/* Set group */

1467

errno = 0;

1468

ret = setgid(0);

1469

if(ret == -1){

1470

perror_plus("setgid");

1471

}

1472

/* Reset supplementary groups */

1473

errno = 0;

1474

ret = setgroups(0, NULL);

1475

if(ret == -1){

1476

perror_plus("setgroups");

1477

}

1478

dup2(devnull, STDIN_FILENO);

1479

close(devnull);

1480

dup2(STDERR_FILENO, STDOUT_FILENO);

1481

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

1482

if(ret == -1){

1483

perror_plus("setenv");

1484

_exit(EX_OSERR);

1485

}

1486

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

1487

if(ret == -1){

1488

perror_plus("setenv");

1489

_exit(EX_OSERR);

1490

}

1491

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

1492

if(ret == -1){

1493

perror_plus("setenv");

1494

_exit(EX_OSERR);

1495

}

1496

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

1497

if(ret == -1){

1498

perror_plus("setenv");

1499

_exit(EX_OSERR);

1500

}

1501

char *delaystring;

1502

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

1503

if(ret == -1){

1504

perror_plus("asprintf");

1505

_exit(EX_OSERR);

1506

}

1507

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

1508

if(ret == -1){

1509

free(delaystring);

1510

perror_plus("setenv");

1511

_exit(EX_OSERR);

1512

}

1513

free(delaystring);

1514

if(connect_to != NULL){

1515

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

1516

if(ret == -1){

1517

perror_plus("setenv");

1518

_exit(EX_OSERR);

1519

}

1520

}

1521

if(execl(fullname, direntry->d_name, mode, NULL) == -1){

1522

perror_plus("execl");

1523

_exit(EXIT_FAILURE);

1524

}

1525

} else {

1526

int status;

1527

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

1528

perror_plus("waitpid");

1529

free(fullname);

1530

continue;

1531

}

1532

if(WIFEXITED(status)){

1533

if(WEXITSTATUS(status) != 0){

1534

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

1535

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

1536

WEXITSTATUS(status));

1537

free(fullname);

1538

continue;

1539

}

1540

} else if(WIFSIGNALED(status)){

1541

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

1542

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

1543

WTERMSIG(status));

1544

free(fullname);

1545

continue;

1546

} else {

1547

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

1548

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

1549

free(fullname);

1550

continue;

1551

}

1552

}

1553

free(fullname);

1554

if(debug){

1555

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

1556

direntry->d_name);

1557

}

1558

}

1559

close(devnull);

1560

}

1561

return true;

1562

}

1563

1564

int bring_up_interface(const char * const interface, const float delay){

1565

int sd = -1;

1566

int ret;

1567

struct ifreq network;

1568

AvahiIfIndex if_index = (AvahiIfIndex)if_nametoindex(interface);

1569

if(if_index == 0){

1570

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

1571

return EX_UNAVAILABLE;

1572

}

1573

1574

if(quit_now){

1575

return EINTR;

1576

}

1577

1578

/* Re-raise priviliges */

1579

raise_privileges();

1580

1581

#ifdef __linux__

1582

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1583

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

1584

ret = klogctl(8, NULL, 5);

1585

bool restore_loglevel = true;

1586

if(ret == -1){

1587

restore_loglevel = false;

1588

perror_plus("klogctl");

1589

}

1590

#endif /* __linux__ */

1591

1592

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1593

if(sd < 0){

1594

perror_plus("socket");

1595

#ifdef __linux__

1596

if(restore_loglevel){

1597

ret = klogctl(7, NULL, 0);

1598

if(ret == -1){

1599

perror_plus("klogctl");

1600

}

1601

}

1602

#endif /* __linux__ */

1603

/* Lower privileges */

1604

lower_privileges();

1605

return EX_OSERR;

1606

;

1607

}

1608

strcpy(network.ifr_name, interface);

1609

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

1610

if(ret == -1){

1611

perror_plus("ioctl SIOCGIFFLAGS");

1612

#ifdef __linux__

1613

if(restore_loglevel){

1614

ret = klogctl(7, NULL, 0);

1615

if(ret == -1){

1616

perror_plus("klogctl");

1617

}

1618

}

1619

#endif /* __linux__ */

1620

/* Lower privileges */

1621

lower_privileges();

1622

return EX_OSERR;

1623

}

1624

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

1625

network.ifr_flags |= IFF_UP;

1626

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

1627

if(ret == -1){

1628

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1629

#ifdef __linux__

1630

if(restore_loglevel){

1631

ret = klogctl(7, NULL, 0);

1632

if(ret == -1){

1633

perror_plus("klogctl");

1634

}

1635

}

1636

#endif /* __linux__ */

1637

/* Lower privileges */

1638

lower_privileges();

1639

return EX_OSERR;

1640

}

1641

}

1642

/* Sleep checking until interface is running.

1643

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

1644

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

1645

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

1646

if(ret == -1){

1647

perror_plus("ioctl SIOCGIFFLAGS");

1648

} else if(network.ifr_flags & IFF_RUNNING){

1649

break;

1650

}

1651

struct timespec sleeptime = { .tv_nsec = 250000000 };

1652

ret = nanosleep(&sleeptime, NULL);

1653

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

1654

perror_plus("nanosleep");

1655

}

1656

}

1657

/* Close the socket */

1658

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

1659

if(ret == -1){

1660

perror_plus("close");

1661

}

1662

#ifdef __linux__

1663

if(restore_loglevel){

1664

/* Restores kernel loglevel to default */

1665

ret = klogctl(7, NULL, 0);

1666

if(ret == -1){

1667

perror_plus("klogctl");

1668

}

1669

}

1670

#endif /* __linux__ */

1671

/* Lower privileges */

1672

lower_privileges();

1673

return errno;

1674

}

1675

893

1676

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

894

1677

AvahiSServiceBrowser *sb = NULL;

895

1678

int error;

897

1680

intmax_t tmpmax;

898

1681

char *tmp;

899

1682

int exitcode = EXIT_SUCCESS;

900

const char *interface = "eth0";

1683

const char *interface = "";

901

1684

struct ifreq network;

902

int sd;

903

uid_t uid;

904

gid_t gid;

905

char *connect_to = NULL;

1685

int sd = -1;

1686

bool take_down_interface = false;

906

1687

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

907

1688

bool tempdir_created = false;

908

1689

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

912

1693

bool gnutls_initialized = false;

913

1694

bool gpgme_initialized = false;

914

1695

float delay = 2.5f;

1696

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

1697

retrying the same server again */

915

1698

916

struct sigaction old_sigterm_action;

1699

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

917

1700

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

918

1701

1702

uid = getuid();

1703

gid = getgid();

1704

1705

/* Lower any group privileges we might have, just to be safe */

1706

errno = 0;

1707

ret = setgid(gid);

1708

if(ret == -1){

1709

perror_plus("setgid");

1710

}

1711

1712

/* Lower user privileges (temporarily) */

1713

errno = 0;

1714

ret = seteuid(uid);

1715

if(ret == -1){

1716

perror_plus("seteuid");

1717

}

1718

1719

if(quit_now){

1720

goto end;

1721

}

1722

919

1723

{

920

1724

struct argp_option options[] = {

921

1725

{ .name = "debug", .key = 128,

950

1754

.arg = "SECONDS",

951

1755

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

952

1756

.group = 2 },

1757

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

1758

.arg = "SECONDS",

1759

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

1760

.group = 2 },

1761

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

1762

.arg = "DIR",

1763

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

1764

.group = 2 },

1765

/*

1766

* These reproduce what we would get without ARGP_NO_HELP

1767

*/

1768

{ .name = "help", .key = '?',

1769

.doc = "Give this help list", .group = -1 },

1770

{ .name = "usage", .key = -3,

1771

.doc = "Give a short usage message", .group = -1 },

1772

{ .name = "version", .key = 'V',

1773

.doc = "Print program version", .group = -1 },

953

1774

{ .name = NULL }

954

1775

};

955

1776

956

1777

error_t parse_opt(int key, char *arg,

957

1778

struct argp_state *state){

1779

errno = 0;

958

1780

switch(key){

959

1781

case 128: /* --debug */

960

1782

debug = true;

976

1798

tmpmax = strtoimax(arg, &tmp, 10);

977

1799

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

978

1800

or tmpmax != (typeof(mc.dh_bits))tmpmax){

979

fprintf(stderr, "Bad number of DH bits\n");

980

exit(EXIT_FAILURE);

1801

argp_error(state, "Bad number of DH bits");

981

1802

}

982

1803

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

983

1804

break;

988

1809

errno = 0;

989

1810

delay = strtof(arg, &tmp);

990

1811

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

991

fprintf(stderr, "Bad delay\n");

992

exit(EXIT_FAILURE);

993

}

994

break;

995

case ARGP_KEY_ARG:

996

argp_usage(state);

997

case ARGP_KEY_END:

1812

argp_error(state, "Bad delay");

1813

}

1814

case 132: /* --retry */

1815

errno = 0;

1816

retry_interval = strtod(arg, &tmp);

1817

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

1818

or (retry_interval * 1000) > INT_MAX

1819

or retry_interval < 0){

1820

argp_error(state, "Bad retry interval");

1821

}

1822

break;

1823

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

1824

hookdir = arg;

1825

break;

1826

/*

1827

* These reproduce what we would get without ARGP_NO_HELP

1828

*/

1829

case '?': /* --help */

1830

argp_state_help(state, state->out_stream,

1831

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1832

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1833

case -3: /* --usage */

1834

argp_state_help(state, state->out_stream,

1835

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1836

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

1837

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

1838

exit(argp_err_exit_status);

998

1839

break;

999

1840

default:

1000

1841

return ARGP_ERR_UNKNOWN;

1001

1842

}

1002

return 0;

1843

return errno;

1003

1844

}

1004

1845

1005

1846

struct argp argp = { .options = options, .parser = parse_opt,

1006

1847

.args_doc = "",

1007

1848

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

1008

1849

" passwords from a Mandos server" };

1009

ret = argp_parse(&argp, argc, argv, 0, 0, NULL);

1010

if(ret == ARGP_ERR_UNKNOWN){

1011

fprintf(stderr, "Unknown error while parsing arguments\n");

1012

exitcode = EXIT_FAILURE;

1013

goto end;

1014

}

1850

ret = argp_parse(&argp, argc, argv,

1851

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1852

switch(ret){

1853

case 0:

1854

break;

1855

case ENOMEM:

1856

default:

1857

errno = ret;

1858

perror_plus("argp_parse");

1859

exitcode = EX_OSERR;

1860

goto end;

1861

case EINVAL:

1862

exitcode = EX_USAGE;

1863

goto end;

1864

}

1865

}

1866

1867

{

1868

/* Work around Debian bug #633582:

1869

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

1870

1871

/* Re-raise priviliges */

1872

if(raise_privileges() == 0){

1873

struct stat st;

1874

1875

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

1876

int seckey_fd = open(seckey, O_RDONLY);

1877

if(seckey_fd == -1){

1878

perror_plus("open");

1879

} else {

1880

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

1881

if(ret == -1){

1882

perror_plus("fstat");

1883

} else {

1884

if(S_ISREG(st.st_mode)

1885

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

1886

ret = fchown(seckey_fd, uid, gid);

1887

if(ret == -1){

1888

perror_plus("fchown");

1889

}

1890

}

1891

}

1892

TEMP_FAILURE_RETRY(close(seckey_fd));

1893

}

1894

}

1895

1896

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

1897

int pubkey_fd = open(pubkey, O_RDONLY);

1898

if(pubkey_fd == -1){

1899

perror_plus("open");

1900

} else {

1901

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

1902

if(ret == -1){

1903

perror_plus("fstat");

1904

} else {

1905

if(S_ISREG(st.st_mode)

1906

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

1907

ret = fchown(pubkey_fd, uid, gid);

1908

if(ret == -1){

1909

perror_plus("fchown");

1910

}

1911

}

1912

}

1913

TEMP_FAILURE_RETRY(close(pubkey_fd));

1914

}

1915

}

1916

1917

/* Lower privileges */

1918

errno = 0;

1919

ret = seteuid(uid);

1920

if(ret == -1){

1921

perror_plus("seteuid");

1922

}

1923

}

1924

}

1925

1926

/* Run network hooks */

1927

if(not run_network_hooks("start", interface, delay)){

1928

goto end;

1015

1929

}

1016

1930

1017

1931

if(not debug){

1018

1932

avahi_set_log_function(empty_log);

1019

1933

}

1020

1934

1935

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

1936

struct dirent **direntries;

1937

/* First look for interfaces that are up */

1938

ret = scandir(sys_class_net, &direntries, up_interface,

1939

alphasort);

1940

if(ret == 0){

1941

/* No up interfaces, look for any good interfaces */

1942

free(direntries);

1943

ret = scandir(sys_class_net, &direntries, good_interface,

1944

alphasort);

1945

}

1946

if(ret >= 1){

1947

/* Pick the first interface returned */

1948

interface = strdup(direntries[0]->d_name);

1949

if(debug){

1950

fprintf_plus(stderr, "Using interface \"%s\"\n", interface);

1951

}

1952

if(interface == NULL){

1953

perror_plus("malloc");

1954

free(direntries);

1955

exitcode = EXIT_FAILURE;

1956

goto end;

1957

}

1958

free(direntries);

1959

} else {

1960

free(direntries);

1961

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

1962

exitcode = EXIT_FAILURE;

1963

goto end;

1964

}

1965

}

1966

1021

1967

/* Initialize Avahi early so avahi_simple_poll_quit() can be called

1022

1968

from the signal handler */

1023

1969

/* Initialize the pseudo-RNG for Avahi */

1024

1970

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

1025

1971

mc.simple_poll = avahi_simple_poll_new();

1026

1972

if(mc.simple_poll == NULL){

1027

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

1028

exitcode = EXIT_FAILURE;

1973

fprintf_plus(stderr,

1974

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

1975

exitcode = EX_UNAVAILABLE;

1029

1976

goto end;

1030

1977

}

1031

1978

1032

1979

sigemptyset(&sigterm_action.sa_mask);

1033

1980

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

1034

1981

if(ret == -1){

1035

perror("sigaddset");

1036

exitcode = EXIT_FAILURE;

1982

perror_plus("sigaddset");

1983

exitcode = EX_OSERR;

1037

1984

goto end;

1038

1985

}

1039

1986

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

1040

1987

if(ret == -1){

1041

perror("sigaddset");

1042

exitcode = EXIT_FAILURE;

1988

perror_plus("sigaddset");

1989

exitcode = EX_OSERR;

1043

1990

goto end;

1044

1991

}

1045

1992

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

1046

1993

if(ret == -1){

1047

perror("sigaddset");

1048

exitcode = EXIT_FAILURE;

1049

goto end;

1050

}

1051

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

1052

if(ret == -1){

1053

perror("sigaction");

1054

exitcode = EXIT_FAILURE;

1055

goto end;

1056

}

1994

perror_plus("sigaddset");

1995

exitcode = EX_OSERR;

1996

goto end;

1997

}

1998

/* Need to check if the handler is SIG_IGN before handling:

1999

| [[info:libc:Initial Signal Actions]] |

2000

| [[info:libc:Basic Signal Handling]] |

2001

*/

2002

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

2003

if(ret == -1){

2004

perror_plus("sigaction");

2005

return EX_OSERR;

2006

}

2007

if(old_sigterm_action.sa_handler != SIG_IGN){

2008

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

2009

if(ret == -1){

2010

perror_plus("sigaction");

2011

exitcode = EX_OSERR;

2012

goto end;

2013

}

2014

}

2015

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

2016

if(ret == -1){

2017

perror_plus("sigaction");

2018

return EX_OSERR;

2019

}

2020

if(old_sigterm_action.sa_handler != SIG_IGN){

2021

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

2022

if(ret == -1){

2023

perror_plus("sigaction");

2024

exitcode = EX_OSERR;

2025

goto end;

2026

}

2027

}

2028

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

2029

if(ret == -1){

2030

perror_plus("sigaction");

2031

return EX_OSERR;

2032

}

2033

if(old_sigterm_action.sa_handler != SIG_IGN){

2034

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

2035

if(ret == -1){

2036

perror_plus("sigaction");

2037

exitcode = EX_OSERR;

2038

goto end;

2039

}

2040

}

1057

2041

1058

2042

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

1059

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

1060

#ifdef __linux__

1061

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1062

messages to mess up the prompt */

1063

ret = klogctl(8, NULL, 5);

1064

bool restore_loglevel = true;

1065

if(ret == -1){

1066

restore_loglevel = false;

1067

perror("klogctl");

1068

}

1069

#endif /* __linux__ */

1070

1071

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1072

if(sd < 0){

1073

perror("socket");

1074

exitcode = EXIT_FAILURE;

1075

#ifdef __linux__

1076

if(restore_loglevel){

1077

ret = klogctl(7, NULL, 0);

1078

if(ret == -1){

1079

perror("klogctl");

1080

}

1081

}

1082

#endif /* __linux__ */

1083

goto end;

1084

}

1085

strcpy(network.ifr_name, interface);

1086

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

1087

if(ret == -1){

1088

perror("ioctl SIOCGIFFLAGS");

1089

#ifdef __linux__

1090

if(restore_loglevel){

1091

ret = klogctl(7, NULL, 0);

1092

if(ret == -1){

1093

perror("klogctl");

1094

}

1095

}

1096

#endif /* __linux__ */

1097

exitcode = EXIT_FAILURE;

1098

goto end;

1099

}

1100

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

1101

network.ifr_flags |= IFF_UP;

1102

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

1103

if(ret == -1){

1104

perror("ioctl SIOCSIFFLAGS");

1105

exitcode = EXIT_FAILURE;

1106

#ifdef __linux__

1107

if(restore_loglevel){

1108

ret = klogctl(7, NULL, 0);

1109

if(ret == -1){

1110

perror("klogctl");

1111

}

1112

}

1113

#endif /* __linux__ */

1114

goto end;

1115

}

1116

}

1117

/* sleep checking until interface is running */

1118

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

1119

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

1120

if(ret == -1){

1121

perror("ioctl SIOCGIFFLAGS");

1122

} else if(network.ifr_flags & IFF_RUNNING){

1123

break;

1124

}

1125

struct timespec sleeptime = { .tv_nsec = 250000000 };

1126

ret = nanosleep(&sleeptime, NULL);

1127

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

1128

perror("nanosleep");

1129

}

1130

}

1131

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

1132

if(ret == -1){

1133

perror("close");

1134

}

1135

#ifdef __linux__

1136

if(restore_loglevel){

1137

/* Restores kernel loglevel to default */

1138

ret = klogctl(7, NULL, 0);

1139

if(ret == -1){

1140

perror("klogctl");

1141

}

1142

}

1143

#endif /* __linux__ */

1144

}

1145

1146

uid = getuid();

1147

gid = getgid();

1148

1149

errno = 0;

1150

setgid(gid);

1151

if(ret == -1){

1152

perror("setgid");

1153

}

1154

1155

ret = setuid(uid);

1156

if(ret == -1){

1157

perror("setuid");

2043

if((interface[0] != '\0') and (strcmp(interface, "none") != 0)){

2044

ret = bring_up_interface(interface, delay);

2045

if(ret){

2046

errno = ret;

2047

perror_plus("Failed to bring up interface");

2048

}

2049

}

2050

2051

if(quit_now){

2052

goto end;

1158

2053

}

1159

2054

1160

2055

ret = init_gnutls_global(pubkey, seckey);

1161

2056

if(ret == -1){

1162

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

1163

exitcode = EXIT_FAILURE;

2057

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

2058

exitcode = EX_UNAVAILABLE;

1164

2059

goto end;

1165

2060

} else {

1166

2061

gnutls_initialized = true;

1167

2062

}

1168

2063

2064

if(quit_now){

2065

goto end;

2066

}

2067

1169

2068

if(mkdtemp(tempdir) == NULL){

1170

perror("mkdtemp");

2069

perror_plus("mkdtemp");

1171

2070

goto end;

1172

2071

}

1173

2072

tempdir_created = true;

1174

2073

2074

if(quit_now){

2075

goto end;

2076

}

2077

1175

2078

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

1176

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

1177

exitcode = EXIT_FAILURE;

2079

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

2080

exitcode = EX_UNAVAILABLE;

1178

2081

goto end;

1179

2082

} else {

1180

2083

gpgme_initialized = true;

1181

2084

}

1182

2085

1183

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

1184

if_index = (AvahiIfIndex) if_nametoindex(interface);

1185

if(if_index == 0){

1186

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

1187

exitcode = EXIT_FAILURE;

1188

goto end;

1189

}

2086

if(quit_now){

2087

goto end;

1190

2088

}

1191

2089

1192

2090

if(connect_to != NULL){

1193

2091

/* Connect directly, do not use Zeroconf */

1194

2092

/* (Mainly meant for debugging) */

1195

2093

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

2094

1196

2095

if(address == NULL){

1197

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

1198

exitcode = EXIT_FAILURE;

1199

goto end;

1200

}

2096

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

2097

exitcode = EX_USAGE;

2098

goto end;

2099

}

2100

2101

if(quit_now){

2102

goto end;

2103

}

2104

1201

2105

uint16_t port;

1202

2106

errno = 0;

1203

2107

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

1204

2108

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

1205

2109

or tmpmax != (uint16_t)tmpmax){

1206

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

1207

exitcode = EXIT_FAILURE;

1208

goto end;

1209

}

2110

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

2111

exitcode = EX_USAGE;

2112

goto end;

2113

}

2114

2115

if(quit_now){

2116

goto end;

2117

}

2118

1210

2119

port = (uint16_t)tmpmax;

1211

2120

*address = '\0';

1212

address = connect_to;

1213

2121

/* Colon in address indicates IPv6 */

1214

2122

int af;

1215

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

2123

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

1216

2124

af = AF_INET6;

2125

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

2126

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

2127

{

2128

connect_to++;

2129

address[-1] = '\0';

2130

}

1217

2131

} else {

1218

2132

af = AF_INET;

1219

2133

}

1220

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

1221

if(ret < 0){

1222

exitcode = EXIT_FAILURE;

1223

} else {

2134

address = connect_to;

2135

2136

if(quit_now){

2137

goto end;

2138

}

2139

2140

while(not quit_now){

2141

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

2142

if(quit_now or ret == 0){

2143

break;

2144

}

2145

if(debug){

2146

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

2147

(int)retry_interval);

2148

}

2149

sleep((int)retry_interval);

2150

}

2151

2152

if (not quit_now){

1224

2153

exitcode = EXIT_SUCCESS;

1225

2154

}

1226

goto end;

1227

}

1228

2155

2156

goto end;

2157

}

2158

2159

if(quit_now){

2160

goto end;

2161

}

2162

1229

2163

{

1230

2164

AvahiServerConfig config;

1231

2165

/* Do not publish any local Zeroconf records */

1246

2180

1247

2181

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

1248

2182

if(mc.server == NULL){

1249

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

1250

avahi_strerror(error));

1251

exitcode = EXIT_FAILURE;

2183

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

2184

avahi_strerror(error));

2185

exitcode = EX_UNAVAILABLE;

2186

goto end;

2187

}

2188

2189

if(quit_now){

1252

2190

goto end;

1253

2191

}

1254

2192

1257

2195

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1258

2196

NULL, 0, browse_callback, NULL);

1259

2197

if(sb == NULL){

1260

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

1261

avahi_strerror(avahi_server_errno(mc.server)));

1262

exitcode = EXIT_FAILURE;

2198

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

2199

avahi_strerror(avahi_server_errno(mc.server)));

2200

exitcode = EX_UNAVAILABLE;

2201

goto end;

2202

}

2203

2204

if(quit_now){

1263

2205

goto end;

1264

2206

}

1265

2207

1266

2208

/* Run the main loop */

1267

2209

1268

2210

if(debug){

1269

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

1270

}

1271

1272

avahi_simple_poll_loop(mc.simple_poll);

2211

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

2212

}

2213

2214

ret = avahi_loop_with_timeout(mc.simple_poll,

2215

(int)(retry_interval * 1000));

2216

if(debug){

2217

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

2218

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

2219

}

1273

2220

1274

2221

end:

1275

2222

1276

2223

if(debug){

1277

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

2224

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

1278

2225

}

1279

2226

1280

2227

/* Cleanup things */

1297

2244

gpgme_release(mc.ctx);

1298

2245

}

1299

2246

1300

/* Removes the temp directory used by GPGME */

2247

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

2248

has seen */

2249

if(mc.current_server != NULL){

2250

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

2251

while(mc.current_server != NULL){

2252

server *next = mc.current_server->next;

2253

free(mc.current_server);

2254

mc.current_server = next;

2255

}

2256

}

2257

2258

/* Run network hooks */

2259

run_network_hooks("stop", interface, delay);

2260

2261

/* Re-raise priviliges */

2262

{

2263

raise_privileges();

2264

2265

/* Take down the network interface */

2266

if(take_down_interface and geteuid() == 0){

2267

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

2268

if(ret == -1){

2269

perror_plus("ioctl SIOCGIFFLAGS");

2270

} else if(network.ifr_flags & IFF_UP){

2271

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

2272

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

2273

if(ret == -1){

2274

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2275

}

2276

}

2277

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

2278

if(ret == -1){

2279

perror_plus("close");

2280

}

2281

}

2282

}

2283

/* Lower privileges permanently */

2284

errno = 0;

2285

ret = setuid(uid);

2286

if(ret == -1){

2287

perror_plus("setuid");

2288

}

2289

2290

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

1301

2291

if(tempdir_created){

1302

DIR *d;

1303

struct dirent *direntry;

1304

d = opendir(tempdir);

1305

if(d == NULL){

1306

if(errno != ENOENT){

1307

perror("opendir");

1308

}

1309

} else {

1310

while(true){

1311

direntry = readdir(d);

1312

if(direntry == NULL){

1313

break;

1314

}

1315

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

1316

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

1317

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

1318

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

1319

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

1320

continue;

1321

}

2292

struct dirent **direntries = NULL;

2293

struct dirent *direntry = NULL;

2294

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

2295

alphasort);

2296

if (numentries > 0){

2297

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

2298

direntry = direntries[i];

1322

2299

char *fullname = NULL;

1323

2300

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

1324

2301

direntry->d_name);

1325

2302

if(ret < 0){

1326

perror("asprintf");

2303

perror_plus("asprintf");

1327

2304

continue;

1328

2305

}

1329

2306

ret = remove(fullname);

1330

2307

if(ret == -1){

1331

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

1332

strerror(errno));

2308

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

2309

strerror(errno));

1333

2310

}

1334

2311

free(fullname);

1335

2312

}

1336

closedir(d);

2313

}

2314

2315

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

2316

free(direntries);

2317

if (numentries == -1){

2318

perror_plus("scandir");

1337

2319

}

1338

2320

ret = rmdir(tempdir);

1339

2321

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

1340

perror("rmdir");

1341

}

2322

perror_plus("rmdir");

2323

}

2324

}

2325

2326

if(quit_now){

2327

sigemptyset(&old_sigterm_action.sa_mask);

2328

old_sigterm_action.sa_handler = SIG_DFL;

2329

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

2330

&old_sigterm_action,

2331

NULL));

2332

if(ret == -1){

2333

perror_plus("sigaction");

2334

}

2335

do {

2336

ret = raise(signal_received);

2337

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

2338

if(ret != 0){

2339

perror_plus("raise");

2340

abort();

2341

}

2342

TEMP_FAILURE_RETRY(pause());

1342

2343

}

1343

2344

1344

2345

return exitcode;