/mandos/release : revision 237.7.73

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

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*

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* Everything else is

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*

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

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

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* along with this program. If not, see

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

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*

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

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

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*/

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

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#ifndef _LARGEFILE_SOURCE

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34

#define _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

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

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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, 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>

104

/* 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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116

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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"

118

128

#define PUBKEY "pubkey.txt"

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

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130

120

131

bool debug = false;

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132

static const char mandos_protocol_version[] = "1";

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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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139

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

140

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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149

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

126

151

typedef struct {

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156

gnutls_dh_params_t dh_params;

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157

const char *priority;

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gpgme_ctx_t ctx;

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server *current_server;

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160

} mandos_context;

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161

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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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168

sig_atomic_t quit_now = 0;

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int signal_received = 0;

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/* Function to use when printing errors */

172

void perror_plus(const char *print_text){

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

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program_invocation_short_name);

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perror(print_text);

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}

177

178

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

179

va_list ap;

180

va_start (ap, format);

181

182

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

183

program_invocation_short_name));

184

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

185

}

140

186

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/*

142

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

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190

* "buffer_length" is how much is already used.

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191

*/

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192

size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

193

size_t buffer_capacity){

148

194

if(buffer_length + BUFFER_SIZE > buffer_capacity){

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195

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

150

196

if(buffer == NULL){

155

201

return buffer_capacity;

156

202

}

157

203

204

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

205

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

206

int af){

207

int ret;

208

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

209

if(new_server == NULL){

210

perror_plus("malloc");

211

return -1;

212

}

213

*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 };

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if(new_server->ip == NULL){

218

perror_plus("strdup");

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return -1;

220

}

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/* Special case of first server */

222

if (mc.current_server == NULL){

223

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 */

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} else {

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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;

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mc.current_server->prev = new_server;

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}

233

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

234

if(ret == -1){

235

perror_plus("clock_gettime");

236

return -1;

237

}

238

return 0;

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}

240

158

241

/*

159

242

* Initialize GPGME.

160

243

*/

161

static bool init_gpgme(const char *seckey,

162

const char *pubkey, const char *tempdir){

163

int ret;

244

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

245

const char *tempdir){

164

246

gpgme_error_t rc;

165

247

gpgme_engine_info_t engine_info;

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248

169

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

170

252

*/

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253

bool import_key(const char *filename){

254

int ret;

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255

int fd;

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256

gpgme_data_t pgp_data;

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257

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

176

259

if(fd == -1){

177

perror("open");

260

perror_plus("open");

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261

return false;

179

262

}

180

263

181

264

rc = gpgme_data_new_from_fd(&pgp_data, fd);

182

265

if(rc != GPG_ERR_NO_ERROR){

183

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

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gpgme_strsource(rc), gpgme_strerror(rc));

266

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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269

}

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rc = gpgme_op_import(mc.ctx, pgp_data);

189

272

if(rc != GPG_ERR_NO_ERROR){

190

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;

193

276

}

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

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279

if(ret == -1){

197

perror("close");

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perror_plus("close");

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}

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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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289

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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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293

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));

294

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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297

}

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298

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

299

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

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rc = gpgme_get_engine_info(&engine_info);

218

301

if(rc != GPG_ERR_NO_ERROR){

219

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

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gpgme_strsource(rc), gpgme_strerror(rc));

302

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

303

gpgme_strsource(rc), gpgme_strerror(rc));

221

304

return false;

222

305

}

223

306

while(engine_info != NULL){

229

312

engine_info = engine_info->next;

230

313

}

231

314

if(engine_info == NULL){

232

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

315

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

316

tempdir);

233

317

return false;

234

318

}

235

319

236

320

/* Create new GPGME "context" */

237

321

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

238

322

if(rc != GPG_ERR_NO_ERROR){

239

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

240

gpgme_strsource(rc), gpgme_strerror(rc));

323

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

324

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

325

gpgme_strerror(rc));

241

326

return false;

242

327

}

243

328

245

330

return false;

246

331

}

247

332

248

return true;

333

return true;

249

334

}

250

335

251

336

/*

262

347

ssize_t plaintext_length = 0;

263

348

264

349

if(debug){

265

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

350

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

266

351

}

267

352

268

353

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

269

354

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

270

355

0);

271

356

if(rc != GPG_ERR_NO_ERROR){

272

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

273

gpgme_strsource(rc), gpgme_strerror(rc));

357

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

358

gpgme_strsource(rc), gpgme_strerror(rc));

274

359

return -1;

275

360

}

276

361

277

362

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

278

363

rc = gpgme_data_new(&dh_plain);

279

364

if(rc != GPG_ERR_NO_ERROR){

280

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

281

gpgme_strsource(rc), gpgme_strerror(rc));

365

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

366

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

367

gpgme_strsource(rc), gpgme_strerror(rc));

282

368

gpgme_data_release(dh_crypto);

283

369

return -1;

284

370

}

287

373

data buffer */

288

374

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

289

375

if(rc != GPG_ERR_NO_ERROR){

290

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

291

gpgme_strsource(rc), gpgme_strerror(rc));

376

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

377

gpgme_strsource(rc), gpgme_strerror(rc));

292

378

plaintext_length = -1;

293

379

if(debug){

294

380

gpgme_decrypt_result_t result;

295

381

result = gpgme_op_decrypt_result(mc.ctx);

296

382

if(result == NULL){

297

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

383

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

298

384

} else {

299

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

300

result->unsupported_algorithm);

301

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

302

result->wrong_key_usage);

385

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

386

result->unsupported_algorithm);

387

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

388

result->wrong_key_usage);

303

389

if(result->file_name != NULL){

304

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

390

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

305

391

}

306

392

gpgme_recipient_t recipient;

307

393

recipient = result->recipients;

308

if(recipient){

309

while(recipient != NULL){

310

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

311

gpgme_pubkey_algo_name(recipient->pubkey_algo));

312

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

313

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

314

recipient->status == GPG_ERR_NO_SECKEY

315

? "No" : "Yes");

316

recipient = recipient->next;

317

}

394

while(recipient != NULL){

395

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

396

gpgme_pubkey_algo_name

397

(recipient->pubkey_algo));

398

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

399

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

400

recipient->status == GPG_ERR_NO_SECKEY

401

? "No" : "Yes");

402

recipient = recipient->next;

318

403

}

319

404

}

320

405

}

322

407

}

323

408

324

409

if(debug){

325

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

410

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

326

411

}

327

412

328

413

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

329

414

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

330

perror("gpgme_data_seek");

415

perror_plus("gpgme_data_seek");

331

416

plaintext_length = -1;

332

417

goto decrypt_end;

333

418

}

335

420

*plaintext = NULL;

336

421

while(true){

337

422

plaintext_capacity = incbuffer(plaintext,

338

(size_t)plaintext_length,

339

plaintext_capacity);

423

(size_t)plaintext_length,

424

plaintext_capacity);

340

425

if(plaintext_capacity == 0){

341

perror("incbuffer");

342

plaintext_length = -1;

343

goto decrypt_end;

426

perror_plus("incbuffer");

427

plaintext_length = -1;

428

goto decrypt_end;

344

429

}

345

430

346

431

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

351

436

break;

352

437

}

353

438

if(ret < 0){

354

perror("gpgme_data_read");

439

perror_plus("gpgme_data_read");

355

440

plaintext_length = -1;

356

441

goto decrypt_end;

357

442

}

359

444

}

360

445

361

446

if(debug){

362

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

447

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

363

448

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

364

449

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

365

450

}

387

472

/* GnuTLS log function callback */

388

473

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

389

474

const char* string){

390

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

475

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

391

476

}

392

477

393

478

static int init_gnutls_global(const char *pubkeyfilename,

395

480

int ret;

396

481

397

482

if(debug){

398

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

483

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

399

484

}

400

485

401

486

ret = gnutls_global_init();

402

487

if(ret != GNUTLS_E_SUCCESS){

403

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

404

safer_gnutls_strerror(ret));

488

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

489

safer_gnutls_strerror(ret));

405

490

return -1;

406

491

}

407

492

414

499

}

415

500

416

501

/* OpenPGP credentials */

417

gnutls_certificate_allocate_credentials(&mc.cred);

502

ret = gnutls_certificate_allocate_credentials(&mc.cred);

418

503

if(ret != GNUTLS_E_SUCCESS){

419

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

420

from

421

-Wunreachable-code

422

*/

423

safer_gnutls_strerror(ret));

504

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

505

safer_gnutls_strerror(ret));

424

506

gnutls_global_deinit();

425

507

return -1;

426

508

}

427

509

428

510

if(debug){

429

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

430

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

431

seckeyfilename);

511

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

512

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

513

pubkeyfilename,

514

seckeyfilename);

432

515

}

433

516

434

517

ret = gnutls_certificate_set_openpgp_key_file

435

518

(mc.cred, pubkeyfilename, seckeyfilename,

436

519

GNUTLS_OPENPGP_FMT_BASE64);

437

520

if(ret != GNUTLS_E_SUCCESS){

438

fprintf(stderr,

439

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

440

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

441

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

442

safer_gnutls_strerror(ret));

521

fprintf_plus(stderr,

522

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

523

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

524

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

525

safer_gnutls_strerror(ret));

443

526

goto globalfail;

444

527

}

445

528

446

529

/* GnuTLS server initialization */

447

530

ret = gnutls_dh_params_init(&mc.dh_params);

448

531

if(ret != GNUTLS_E_SUCCESS){

449

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

450

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

532

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

533

" initialization: %s\n",

534

safer_gnutls_strerror(ret));

451

535

goto globalfail;

452

536

}

453

537

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

454

538

if(ret != GNUTLS_E_SUCCESS){

455

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

456

safer_gnutls_strerror(ret));

539

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

540

safer_gnutls_strerror(ret));

457

541

goto globalfail;

458

542

}

459

543

472

556

static int init_gnutls_session(gnutls_session_t *session){

473

557

int ret;

474

558

/* GnuTLS session creation */

475

ret = gnutls_init(session, GNUTLS_SERVER);

559

do {

560

ret = gnutls_init(session, GNUTLS_SERVER);

561

if(quit_now){

562

return -1;

563

}

564

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

476

565

if(ret != GNUTLS_E_SUCCESS){

477

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

478

safer_gnutls_strerror(ret));

566

fprintf_plus(stderr,

567

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

568

safer_gnutls_strerror(ret));

479

569

}

480

570

481

571

{

482

572

const char *err;

483

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

573

do {

574

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

575

if(quit_now){

576

gnutls_deinit(*session);

577

return -1;

578

}

579

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

484

580

if(ret != GNUTLS_E_SUCCESS){

485

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

486

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

487

safer_gnutls_strerror(ret));

581

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

582

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

583

safer_gnutls_strerror(ret));

488

584

gnutls_deinit(*session);

489

585

return -1;

490

586

}

491

587

}

492

588

493

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

494

mc.cred);

589

do {

590

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

591

mc.cred);

592

if(quit_now){

593

gnutls_deinit(*session);

594

return -1;

595

}

596

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

495

597

if(ret != GNUTLS_E_SUCCESS){

496

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

497

safer_gnutls_strerror(ret));

598

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

599

safer_gnutls_strerror(ret));

498

600

gnutls_deinit(*session);

499

601

return -1;

500

602

}

501

603

502

604

/* ignore client certificate if any. */

503

gnutls_certificate_server_set_request(*session,

504

GNUTLS_CERT_IGNORE);

605

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

505

606

506

607

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

507

608

516

617

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

517

618

AvahiIfIndex if_index,

518

619

int af){

519

int ret, tcp_sd;

620

int ret, tcp_sd = -1;

520

621

ssize_t sret;

521

622

union {

522

623

struct sockaddr_in in;

523

624

struct sockaddr_in6 in6;

524

625

} to;

525

626

char *buffer = NULL;

526

char *decrypted_buffer;

627

char *decrypted_buffer = NULL;

527

628

size_t buffer_length = 0;

528

629

size_t buffer_capacity = 0;

529

ssize_t decrypted_buffer_size;

530

630

size_t written;

531

int retval = 0;

631

int retval = -1;

532

632

gnutls_session_t session;

533

633

int pf; /* Protocol family */

534

634

635

errno = 0;

636

637

if(quit_now){

638

errno = EINTR;

639

return -1;

640

}

641

535

642

switch(af){

536

643

case AF_INET6:

537

644

pf = PF_INET6;

540

647

pf = PF_INET;

541

648

break;

542

649

default:

543

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

650

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

651

errno = EINVAL;

544

652

return -1;

545

653

}

546

654

550

658

}

551

659

552

660

if(debug){

553

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

554

"\n", ip, port);

661

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

662

PRIu16 "\n", ip, port);

555

663

}

556

664

557

665

tcp_sd = socket(pf, SOCK_STREAM, 0);

558

666

if(tcp_sd < 0){

559

perror("socket");

560

return -1;

667

int e = errno;

668

perror_plus("socket");

669

errno = e;

670

goto mandos_end;

671

}

672

673

if(quit_now){

674

errno = EINTR;

675

goto mandos_end;

561

676

}

562

677

563

678

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

564

679

if(af == AF_INET6){

565

to.in6.sin6_family = (uint16_t)af;

680

to.in6.sin6_family = (sa_family_t)af;

566

681

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

567

682

} else { /* IPv4 */

568

683

to.in.sin_family = (sa_family_t)af;

569

684

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

570

685

}

571

686

if(ret < 0 ){

572

perror("inet_pton");

573

return -1;

687

int e = errno;

688

perror_plus("inet_pton");

689

errno = e;

690

goto mandos_end;

574

691

}

575

692

if(ret == 0){

576

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

577

return -1;

693

int e = errno;

694

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

695

errno = e;

696

goto mandos_end;

578

697

}

579

698

if(af == AF_INET6){

580

699

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

583

702

584

703

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

585

704

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

586

-Wunreachable-code*/

705

-Wunreachable-code*/

587

706

if(if_index == AVAHI_IF_UNSPEC){

588

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

589

" without a network interface\n");

590

return -1;

707

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

708

" incomplete without a network interface\n");

709

errno = EINVAL;

710

goto mandos_end;

591

711

}

592

712

/* Set the network interface number as scope */

593

713

to.in6.sin6_scope_id = (uint32_t)if_index;

598

718

-Wunreachable-code */

599

719

}

600

720

721

if(quit_now){

722

errno = EINTR;

723

goto mandos_end;

724

}

725

601

726

if(debug){

602

727

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

603

728

char interface[IF_NAMESIZE];

604

729

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

605

perror("if_indextoname");

730

perror_plus("if_indextoname");

606

731

} else {

607

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

608

ip, interface, port);

732

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

733

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

609

734

}

610

735

} else {

611

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

612

port);

736

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

737

ip, port);

613

738

}

614

739

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

615

740

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

622

747

sizeof(addrstr));

623

748

}

624

749

if(pcret == NULL){

625

perror("inet_ntop");

750

perror_plus("inet_ntop");

626

751

} else {

627

752

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

628

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

753

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

629

754

}

630

755

}

631

756

}

632

757

758

if(quit_now){

759

errno = EINTR;

760

goto mandos_end;

761

}

762

633

763

if(af == AF_INET6){

634

764

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

635

765

} else {

636

766

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

637

767

}

638

768

if(ret < 0){

639

perror("connect");

640

return -1;

769

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

770

int e = errno;

771

perror_plus("connect");

772

errno = e;

773

}

774

goto mandos_end;

775

}

776

777

if(quit_now){

778

errno = EINTR;

779

goto mandos_end;

641

780

}

642

781

643

782

const char *out = mandos_protocol_version;

645

784

while(true){

646

785

size_t out_size = strlen(out);

647

786

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

648

out_size - written));

787

out_size - written));

649

788

if(ret == -1){

650

perror("write");

651

retval = -1;

789

int e = errno;

790

perror_plus("write");

791

errno = e;

652

792

goto mandos_end;

653

793

}

654

794

written += (size_t)ret;

662

802

break;

663

803

}

664

804

}

805

806

if(quit_now){

807

errno = EINTR;

808

goto mandos_end;

809

}

665

810

}

666

811

667

812

if(debug){

668

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

669

}

670

813

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

814

}

815

816

if(quit_now){

817

errno = EINTR;

818

goto mandos_end;

819

}

820

821

/* Spurious warning from -Wint-to-pointer-cast */

671

822

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

672

823

673

do{

824

if(quit_now){

825

errno = EINTR;

826

goto mandos_end;

827

}

828

829

do {

674

830

ret = gnutls_handshake(session);

831

if(quit_now){

832

errno = EINTR;

833

goto mandos_end;

834

}

675

835

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

676

836

677

837

if(ret != GNUTLS_E_SUCCESS){

678

838

if(debug){

679

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

839

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

680

840

gnutls_perror(ret);

681

841

}

682

retval = -1;

842

errno = EPROTO;

683

843

goto mandos_end;

684

844

}

685

845

686

846

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

687

847

688

848

if(debug){

689

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

690

ip);

849

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

850

" %s\n", ip);

691

851

}

692

852

693

853

while(true){

854

855

if(quit_now){

856

errno = EINTR;

857

goto mandos_end;

858

}

859

694

860

buffer_capacity = incbuffer(&buffer, buffer_length,

695

buffer_capacity);

861

buffer_capacity);

696

862

if(buffer_capacity == 0){

697

perror("incbuffer");

698

retval = -1;

863

int e = errno;

864

perror_plus("incbuffer");

865

errno = e;

866

goto mandos_end;

867

}

868

869

if(quit_now){

870

errno = EINTR;

699

871

goto mandos_end;

700

872

}

701

873

710

882

case GNUTLS_E_AGAIN:

711

883

break;

712

884

case GNUTLS_E_REHANDSHAKE:

713

do{

885

do {

714

886

ret = gnutls_handshake(session);

887

888

if(quit_now){

889

errno = EINTR;

890

goto mandos_end;

891

}

715

892

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

716

893

if(ret < 0){

717

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

894

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

895

"***\n");

718

896

gnutls_perror(ret);

719

retval = -1;

897

errno = EPROTO;

720

898

goto mandos_end;

721

899

}

722

900

break;

723

901

default:

724

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

725

" encrypted session with Mandos server\n");

726

retval = -1;

902

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

903

" encrypted session with Mandos server\n");

727

904

gnutls_bye(session, GNUTLS_SHUT_RDWR);

905

errno = EIO;

728

906

goto mandos_end;

729

907

}

730

908

} else {

733

911

}

734

912

735

913

if(debug){

736

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

737

}

738

739

gnutls_bye(session, GNUTLS_SHUT_RDWR);

914

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

915

}

916

917

if(quit_now){

918

errno = EINTR;

919

goto mandos_end;

920

}

921

922

do {

923

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

924

if(quit_now){

925

errno = EINTR;

926

goto mandos_end;

927

}

928

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

740

929

741

930

if(buffer_length > 0){

742

decrypted_buffer_size = pgp_packet_decrypt(buffer,

743

buffer_length,

931

ssize_t decrypted_buffer_size;

932

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

744

933

&decrypted_buffer);

745

934

if(decrypted_buffer_size >= 0){

935

746

936

written = 0;

747

937

while(written < (size_t) decrypted_buffer_size){

938

if(quit_now){

939

errno = EINTR;

940

goto mandos_end;

941

}

942

748

943

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

749

944

(size_t)decrypted_buffer_size - written,

750

945

stdout);

751

946

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

947

int e = errno;

752

948

if(debug){

753

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

754

strerror(errno));

949

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

950

strerror(errno));

755

951

}

756

retval = -1;

757

break;

952

errno = e;

953

goto mandos_end;

758

954

}

759

955

written += (size_t)ret;

760

956

}

761

free(decrypted_buffer);

762

} else {

763

retval = -1;

957

retval = 0;

764

958

}

765

} else {

766

retval = -1;

767

959

}

768

960

769

961

/* Shutdown procedure */

770

962

771

963

mandos_end:

772

free(buffer);

773

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

774

if(ret == -1){

775

perror("close");

964

{

965

int e = errno;

966

free(decrypted_buffer);

967

free(buffer);

968

if(tcp_sd >= 0){

969

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

970

}

971

if(ret == -1){

972

if(e == 0){

973

e = errno;

974

}

975

perror_plus("close");

976

}

977

gnutls_deinit(session);

978

errno = e;

979

if(quit_now){

980

errno = EINTR;

981

retval = -1;

982

}

776

983

}

777

gnutls_deinit(session);

778

984

return retval;

779

985

}

780

986

797

1003

/* Called whenever a service has been resolved successfully or

798

1004

timed out */

799

1005

1006

if(quit_now){

1007

return;

1008

}

1009

800

1010

switch(event){

801

1011

default:

802

1012

case AVAHI_RESOLVER_FAILURE:

803

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

804

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

805

avahi_strerror(avahi_server_errno(mc.server)));

1013

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

1014

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

1015

domain,

1016

avahi_strerror(avahi_server_errno(mc.server)));

806

1017

break;

807

1018

808

1019

case AVAHI_RESOLVER_FOUND:

810

1021

char ip[AVAHI_ADDRESS_STR_MAX];

811

1022

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

812

1023

if(debug){

813

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

814

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

815

ip, (intmax_t)interface, port);

1024

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

1025

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

1026

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

816

1027

}

817

1028

int ret = start_mandos_communication(ip, port, interface,

818

1029

avahi_proto_to_af(proto));

819

1030

if(ret == 0){

820

1031

avahi_simple_poll_quit(mc.simple_poll);

1032

} else {

1033

ret = add_server(ip, port, interface,

1034

avahi_proto_to_af(proto));

821

1035

}

822

1036

}

823

1037

}

839

1053

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

840

1054

is removed from the LAN */

841

1055

1056

if(quit_now){

1057

return;

1058

}

1059

842

1060

switch(event){

843

1061

default:

844

1062

case AVAHI_BROWSER_FAILURE:

845

1063

846

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

847

avahi_strerror(avahi_server_errno(mc.server)));

1064

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

1065

avahi_strerror(avahi_server_errno(mc.server)));

848

1066

avahi_simple_poll_quit(mc.simple_poll);

849

1067

return;

850

1068

854

1072

the callback function is called the Avahi server will free the

855

1073

resolver for us. */

856

1074

857

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

858

protocol, name, type, domain,

859

AVAHI_PROTO_INET6, 0,

860

resolve_callback, NULL)))

861

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

862

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

1075

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

1076

name, type, domain, protocol, 0,

1077

resolve_callback, NULL) == NULL)

1078

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

1079

" %s\n", name,

1080

avahi_strerror(avahi_server_errno(mc.server)));

863

1081

break;

864

1082

865

1083

case AVAHI_BROWSER_REMOVE:

868

1086

case AVAHI_BROWSER_ALL_FOR_NOW:

869

1087

case AVAHI_BROWSER_CACHE_EXHAUSTED:

870

1088

if(debug){

871

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

1089

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

1090

" searching...\n");

872

1091

}

873

1092

break;

874

1093

}

875

1094

}

876

1095

877

sig_atomic_t quit_now = 0;

878

879

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

880

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

1096

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

1097

static void handle_sigterm(int sig){

881

1098

if(quit_now){

882

1099

return;

883

1100

}

884

1101

quit_now = 1;

1102

signal_received = sig;

885

1103

int old_errno = errno;

1104

/* set main loop to exit */

886

1105

if(mc.simple_poll != NULL){

887

1106

avahi_simple_poll_quit(mc.simple_poll);

888

1107

}

889

1108

errno = old_errno;

890

1109

}

891

1110

1111

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

1112

int ret;

1113

1114

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

1115

if(s < 0){

1116

perror_plus("socket");

1117

return false;

1118

}

1119

strcpy(ifr->ifr_name, ifname);

1120

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1121

if(ret == -1){

1122

if(debug){

1123

perror_plus("ioctl SIOCGIFFLAGS");

1124

}

1125

return false;

1126

}

1127

return true;

1128

}

1129

1130

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

1131

1132

/* Reject the loopback device */

1133

if(ifr->ifr_flags & IFF_LOOPBACK){

1134

if(debug){

1135

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

1136

ifname);

1137

}

1138

return false;

1139

}

1140

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

1141

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

1142

if(debug){

1143

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

1144

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

1145

}

1146

return true;

1147

}

1148

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

1149

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

1150

if(debug){

1151

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1152

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

1153

}

1154

return false;

1155

}

1156

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

1157

if(ifr->ifr_flags & IFF_NOARP){

1158

if(debug){

1159

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

1160

ifname);

1161

}

1162

return false;

1163

}

1164

1165

/* Accept this device */

1166

if(debug){

1167

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

1168

}

1169

return true;

1170

}

1171

1172

/*

1173

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

1174

* corresponds to an acceptable network device.

1175

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

1176

*/

1177

int good_interface(const struct dirent *if_entry){

1178

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

1179

return 0;

1180

}

1181

1182

struct ifreq ifr;

1183

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

1184

if(debug){

1185

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

1186

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

1187

}

1188

return 0;

1189

}

1190

1191

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

1192

return 0;

1193

}

1194

return 1;

1195

}

1196

1197

/*

1198

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

1199

* corresponds to an acceptable network device which is up.

1200

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

1201

*/

1202

int up_interface(const struct dirent *if_entry){

1203

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

1204

return 0;

1205

}

1206

1207

struct ifreq ifr;

1208

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

1209

if(debug){

1210

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

1211

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

1212

}

1213

return 0;

1214

}

1215

1216

/* Reject down interfaces */

1217

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

1218

if(debug){

1219

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

1220

if_entry->d_name);

1221

}

1222

return 0;

1223

}

1224

1225

/* Reject non-running interfaces */

1226

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

1227

if(debug){

1228

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

1229

if_entry->d_name);

1230

}

1231

return 0;

1232

}

1233

1234

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

1235

return 0;

1236

}

1237

return 1;

1238

}

1239

1240

int notdotentries(const struct dirent *direntry){

1241

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

1242

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

1243

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

1244

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

1245

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

1246

return 0;

1247

}

1248

return 1;

1249

}

1250

1251

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

1252

int runnable_hook(const struct dirent *direntry){

1253

int ret;

1254

size_t sret;

1255

struct stat st;

1256

1257

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

1258

/* Empty name? */

1259

return 0;

1260

}

1261

1262

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

1263

"abcdefghijklmnopqrstuvwxyz"

1264

"0123456789"

1265

"_-");

1266

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

1267

/* Contains non-allowed characters */

1268

if(debug){

1269

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

1270

direntry->d_name);

1271

}

1272

return 0;

1273

}

1274

1275

char *fullname = NULL;

1276

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

1277

if(ret < 0){

1278

perror_plus("asprintf");

1279

return 0;

1280

}

1281

1282

ret = stat(fullname, &st);

1283

if(ret == -1){

1284

if(debug){

1285

perror_plus("Could not stat hook");

1286

}

1287

return 0;

1288

}

1289

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

1290

/* Not a regular file */

1291

if(debug){

1292

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

1293

direntry->d_name);

1294

}

1295

return 0;

1296

}

1297

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

1298

/* Not executable */

1299

if(debug){

1300

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

1301

direntry->d_name);

1302

}

1303

return 0;

1304

}

1305

if(debug){

1306

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

1307

direntry->d_name);

1308

}

1309

return 1;

1310

}

1311

1312

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1313

int ret;

1314

struct timespec now;

1315

struct timespec waited_time;

1316

intmax_t block_time;

1317

1318

while(true){

1319

if(mc.current_server == NULL){

1320

if (debug){

1321

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

1322

" No timeout!\n");

1323

}

1324

ret = avahi_simple_poll_iterate(s, -1);

1325

} else {

1326

if (debug){

1327

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

1328

" it, or wait\n");

1329

}

1330

/* the current time */

1331

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1332

if(ret == -1){

1333

perror_plus("clock_gettime");

1334

return -1;

1335

}

1336

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

1337

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

1338

waited_time.tv_sec = (now.tv_sec

1339

- mc.current_server->last_seen.tv_sec);

1340

waited_time.tv_nsec = (now.tv_nsec

1341

- mc.current_server->last_seen.tv_nsec);

1342

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

1343

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

1344

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

1345

block_time = ((retry_interval

1346

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

1347

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

1348

1349

if (debug){

1350

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

1351

block_time);

1352

}

1353

1354

if(block_time <= 0){

1355

ret = start_mandos_communication(mc.current_server->ip,

1356

mc.current_server->port,

1357

mc.current_server->if_index,

1358

mc.current_server->af);

1359

if(ret == 0){

1360

avahi_simple_poll_quit(mc.simple_poll);

1361

return 0;

1362

}

1363

ret = clock_gettime(CLOCK_MONOTONIC,

1364

&mc.current_server->last_seen);

1365

if(ret == -1){

1366

perror_plus("clock_gettime");

1367

return -1;

1368

}

1369

mc.current_server = mc.current_server->next;

1370

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

1371

servers, but don't block */

1372

}

1373

1374

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

1375

}

1376

if(ret != 0){

1377

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

1378

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

1379

}

1380

}

1381

}

1382

}

1383

1384

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

1385

const float delay){

1386

struct dirent **direntries;

1387

struct dirent *direntry;

1388

int ret;

1389

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

1390

alphasort);

1391

if(numhooks == -1){

1392

perror_plus("scandir");

1393

} else {

1394

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

1395

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

1396

direntry = direntries[i];

1397

char *fullname = NULL;

1398

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

1399

if(ret < 0){

1400

perror_plus("asprintf");

1401

continue;

1402

}

1403

if(debug){

1404

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

1405

direntry->d_name);

1406

}

1407

pid_t hook_pid = fork();

1408

if(hook_pid == 0){

1409

/* Child */

1410

/* Raise privileges */

1411

errno = 0;

1412

ret = seteuid(0);

1413

if(ret == -1){

1414

perror_plus("seteuid");

1415

}

1416

/* Raise privileges even more */

1417

errno = 0;

1418

ret = setuid(0);

1419

if(ret == -1){

1420

perror_plus("setuid");

1421

}

1422

/* Set group */

1423

errno = 0;

1424

ret = setgid(0);

1425

if(ret == -1){

1426

perror_plus("setgid");

1427

}

1428

/* Reset supplementary groups */

1429

errno = 0;

1430

ret = setgroups(0, NULL);

1431

if(ret == -1){

1432

perror_plus("setgroups");

1433

}

1434

dup2(devnull, STDIN_FILENO);

1435

close(devnull);

1436

dup2(STDERR_FILENO, STDOUT_FILENO);

1437

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

1438

if(ret == -1){

1439

perror_plus("setenv");

1440

_exit(EX_OSERR);

1441

}

1442

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

1443

if(ret == -1){

1444

perror_plus("setenv");

1445

_exit(EX_OSERR);

1446

}

1447

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

1448

if(ret == -1){

1449

perror_plus("setenv");

1450

_exit(EX_OSERR);

1451

}

1452

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

1453

if(ret == -1){

1454

perror_plus("setenv");

1455

_exit(EX_OSERR);

1456

}

1457

char *delaystring;

1458

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

1459

if(ret == -1){

1460

perror_plus("asprintf");

1461

_exit(EX_OSERR);

1462

}

1463

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

1464

if(ret == -1){

1465

free(delaystring);

1466

perror_plus("setenv");

1467

_exit(EX_OSERR);

1468

}

1469

free(delaystring);

1470

ret = execl(fullname, direntry->d_name, mode, NULL);

1471

perror_plus("execl");

1472

} else {

1473

int status;

1474

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

1475

perror_plus("waitpid");

1476

free(fullname);

1477

continue;

1478

}

1479

if(WIFEXITED(status)){

1480

if(WEXITSTATUS(status) != 0){

1481

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

1482

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

1483

WEXITSTATUS(status));

1484

free(fullname);

1485

continue;

1486

}

1487

} else if(WIFSIGNALED(status)){

1488

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

1489

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

1490

WTERMSIG(status));

1491

free(fullname);

1492

continue;

1493

} else {

1494

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

1495

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

1496

free(fullname);

1497

continue;

1498

}

1499

}

1500

free(fullname);

1501

if(debug){

1502

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

1503

direntry->d_name);

1504

}

1505

}

1506

close(devnull);

1507

}

1508

return true;

1509

}

1510

892

1511

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

893

1512

AvahiSServiceBrowser *sb = NULL;

894

1513

int error;

896

1515

intmax_t tmpmax;

897

1516

char *tmp;

898

1517

int exitcode = EXIT_SUCCESS;

899

const char *interface = "eth0";

1518

const char *interface = "";

900

1519

struct ifreq network;

901

int sd;

1520

int sd = -1;

1521

bool take_down_interface = false;

902

1522

uid_t uid;

903

1523

gid_t gid;

904

char *connect_to = NULL;

905

1524

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

906

1525

bool tempdir_created = false;

907

1526

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

908

1527

const char *seckey = PATHDIR "/" SECKEY;

909

1528

const char *pubkey = PATHDIR "/" PUBKEY;

910

1529

911

/* Initialize Mandos context */

912

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

913

.dh_bits = 1024, .priority = "SECURE256"

914

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

915

1530

bool gnutls_initialized = false;

916

1531

bool gpgme_initialized = false;

917

1532

float delay = 2.5f;

1533

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

1534

retrying the same server again */

918

1535

919

struct sigaction old_sigterm_action;

1536

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

920

1537

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

921

1538

1539

uid = getuid();

1540

gid = getgid();

1541

1542

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

1543

errno = 0;

1544

ret = setgid(gid);

1545

if(ret == -1){

1546

perror_plus("setgid");

1547

}

1548

1549

/* Lower user privileges (temporarily) */

1550

errno = 0;

1551

ret = seteuid(uid);

1552

if(ret == -1){

1553

perror_plus("seteuid");

1554

}

1555

1556

if(quit_now){

1557

goto end;

1558

}

1559

922

1560

{

923

1561

struct argp_option options[] = {

924

1562

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

953

1591

.arg = "SECONDS",

954

1592

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

955

1593

.group = 2 },

1594

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

1595

.arg = "SECONDS",

1596

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

1597

.group = 2 },

1598

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

1599

.arg = "DIR",

1600

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

1601

.group = 2 },

1602

/*

1603

* These reproduce what we would get without ARGP_NO_HELP

1604

*/

1605

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

1606

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

1607

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

1608

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

1609

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

1610

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

956

1611

{ .name = NULL }

957

1612

};

958

1613

959

1614

error_t parse_opt(int key, char *arg,

960

1615

struct argp_state *state){

1616

errno = 0;

961

1617

switch(key){

962

1618

case 128: /* --debug */

963

1619

debug = true;

979

1635

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

980

1636

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

981

1637

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

982

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

983

exit(EXIT_FAILURE);

1638

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

984

1639

}

985

1640

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

986

1641

break;

991

1646

errno = 0;

992

1647

delay = strtof(arg, &tmp);

993

1648

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

994

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

995

exit(EXIT_FAILURE);

996

}

997

break;

998

case ARGP_KEY_ARG:

999

argp_usage(state);

1000

case ARGP_KEY_END:

1649

argp_error(state, "Bad delay");

1650

}

1651

case 132: /* --retry */

1652

errno = 0;

1653

retry_interval = strtod(arg, &tmp);

1654

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

1655

or (retry_interval * 1000) > INT_MAX

1656

or retry_interval < 0){

1657

argp_error(state, "Bad retry interval");

1658

}

1659

break;

1660

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

1661

hookdir = arg;

1662

break;

1663

/*

1664

* These reproduce what we would get without ARGP_NO_HELP

1665

*/

1666

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

1667

argp_state_help(state, state->out_stream,

1668

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1669

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1670

case -3: /* --usage */

1671

argp_state_help(state, state->out_stream,

1672

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1673

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

1674

fprintf_plus(state->out_stream,

1675

"Mandos plugin mandos-client: ");

1676

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

1677

exit(argp_err_exit_status);

1001

1678

break;

1002

1679

default:

1003

1680

return ARGP_ERR_UNKNOWN;

1004

1681

}

1005

return 0;

1682

return errno;

1006

1683

}

1007

1684

1008

1685

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

1009

1686

.args_doc = "",

1010

1687

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

1011

1688

" passwords from a Mandos server" };

1012

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

1013

if(ret == ARGP_ERR_UNKNOWN){

1014

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

1015

exitcode = EXIT_FAILURE;

1016

goto end;

1017

}

1689

ret = argp_parse(&argp, argc, argv,

1690

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1691

switch(ret){

1692

case 0:

1693

break;

1694

case ENOMEM:

1695

default:

1696

errno = ret;

1697

perror_plus("argp_parse");

1698

exitcode = EX_OSERR;

1699

goto end;

1700

case EINVAL:

1701

exitcode = EX_USAGE;

1702

goto end;

1703

}

1704

}

1705

1706

{

1707

/* Work around Debian bug #633582:

1708

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

1709

1710

/* Re-raise priviliges */

1711

errno = 0;

1712

ret = seteuid(0);

1713

if(ret == -1){

1714

perror_plus("seteuid");

1715

} else {

1716

struct stat st;

1717

1718

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

1719

int seckey_fd = open(seckey, O_RDONLY);

1720

if(seckey_fd == -1){

1721

perror_plus("open");

1722

} else {

1723

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

1724

if(ret == -1){

1725

perror_plus("fstat");

1726

} else {

1727

if(S_ISREG(st.st_mode)

1728

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

1729

ret = fchown(seckey_fd, uid, gid);

1730

if(ret == -1){

1731

perror_plus("fchown");

1732

}

1733

}

1734

}

1735

TEMP_FAILURE_RETRY(close(seckey_fd));

1736

}

1737

}

1738

1739

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

1740

int pubkey_fd = open(pubkey, O_RDONLY);

1741

if(pubkey_fd == -1){

1742

perror_plus("open");

1743

} else {

1744

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

1745

if(ret == -1){

1746

perror_plus("fstat");

1747

} else {

1748

if(S_ISREG(st.st_mode)

1749

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

1750

ret = fchown(pubkey_fd, uid, gid);

1751

if(ret == -1){

1752

perror_plus("fchown");

1753

}

1754

}

1755

}

1756

TEMP_FAILURE_RETRY(close(pubkey_fd));

1757

}

1758

}

1759

1760

/* Lower privileges */

1761

errno = 0;

1762

ret = seteuid(uid);

1763

if(ret == -1){

1764

perror_plus("seteuid");

1765

}

1766

}

1767

}

1768

1769

/* Run network hooks */

1770

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

1771

goto end;

1018

1772

}

1019

1773

1020

1774

if(not debug){

1021

1775

avahi_set_log_function(empty_log);

1022

1776

}

1023

1777

1778

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

1779

struct dirent **direntries;

1780

/* First look for interfaces that are up */

1781

ret = scandir(sys_class_net, &direntries, up_interface,

1782

alphasort);

1783

if(ret == 0){

1784

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

1785

free(direntries);

1786

ret = scandir(sys_class_net, &direntries, good_interface,

1787

alphasort);

1788

}

1789

if(ret >= 1){

1790

/* Pick the first interface returned */

1791

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

1792

if(debug){

1793

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

1794

}

1795

if(interface == NULL){

1796

perror_plus("malloc");

1797

free(direntries);

1798

exitcode = EXIT_FAILURE;

1799

goto end;

1800

}

1801

free(direntries);

1802

} else {

1803

free(direntries);

1804

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

1805

exitcode = EXIT_FAILURE;

1806

goto end;

1807

}

1808

}

1809

1024

1810

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

1025

1811

from the signal handler */

1026

1812

/* Initialize the pseudo-RNG for Avahi */

1027

1813

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

1028

1814

mc.simple_poll = avahi_simple_poll_new();

1029

1815

if(mc.simple_poll == NULL){

1030

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

1031

exitcode = EXIT_FAILURE;

1816

fprintf_plus(stderr,

1817

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

1818

exitcode = EX_UNAVAILABLE;

1032

1819

goto end;

1033

1820

}

1034

1821

1035

1822

sigemptyset(&sigterm_action.sa_mask);

1036

1823

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

1037

1824

if(ret == -1){

1038

perror("sigaddset");

1039

exitcode = EXIT_FAILURE;

1825

perror_plus("sigaddset");

1826

exitcode = EX_OSERR;

1040

1827

goto end;

1041

1828

}

1042

1829

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

1043

1830

if(ret == -1){

1044

perror("sigaddset");

1045

exitcode = EXIT_FAILURE;

1831

perror_plus("sigaddset");

1832

exitcode = EX_OSERR;

1046

1833

goto end;

1047

1834

}

1048

1835

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

1049

1836

if(ret == -1){

1050

perror("sigaddset");

1051

exitcode = EXIT_FAILURE;

1052

goto end;

1053

}

1054

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

1055

if(ret == -1){

1056

perror("sigaction");

1057

exitcode = EXIT_FAILURE;

1058

goto end;

1059

}

1837

perror_plus("sigaddset");

1838

exitcode = EX_OSERR;

1839

goto end;

1840

}

1841

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

1842

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

1843

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

1844

*/

1845

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

1846

if(ret == -1){

1847

perror_plus("sigaction");

1848

return EX_OSERR;

1849

}

1850

if(old_sigterm_action.sa_handler != SIG_IGN){

1851

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

1852

if(ret == -1){

1853

perror_plus("sigaction");

1854

exitcode = EX_OSERR;

1855

goto end;

1856

}

1857

}

1858

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

1859

if(ret == -1){

1860

perror_plus("sigaction");

1861

return EX_OSERR;

1862

}

1863

if(old_sigterm_action.sa_handler != SIG_IGN){

1864

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

1865

if(ret == -1){

1866

perror_plus("sigaction");

1867

exitcode = EX_OSERR;

1868

goto end;

1869

}

1870

}

1871

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

1872

if(ret == -1){

1873

perror_plus("sigaction");

1874

return EX_OSERR;

1875

}

1876

if(old_sigterm_action.sa_handler != SIG_IGN){

1877

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

1878

if(ret == -1){

1879

perror_plus("sigaction");

1880

exitcode = EX_OSERR;

1881

goto end;

1882

}

1883

}

1060

1884

1061

1885

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

1062

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

1886

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

1887

if_index = (AvahiIfIndex) if_nametoindex(interface);

1888

if(if_index == 0){

1889

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

1890

exitcode = EX_UNAVAILABLE;

1891

goto end;

1892

}

1893

1894

if(quit_now){

1895

goto end;

1896

}

1897

1898

/* Re-raise priviliges */

1899

errno = 0;

1900

ret = seteuid(0);

1901

if(ret == -1){

1902

perror_plus("seteuid");

1903

}

1904

1063

1905

#ifdef __linux__

1064

1906

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1065

messages to mess up the prompt */

1907

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

1066

1908

ret = klogctl(8, NULL, 5);

1067

1909

bool restore_loglevel = true;

1068

1910

if(ret == -1){

1069

1911

restore_loglevel = false;

1070

perror("klogctl");

1912

perror_plus("klogctl");

1071

1913

}

1072

1914

#endif /* __linux__ */

1073

1915

1074

1916

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1075

1917

if(sd < 0){

1076

perror("socket");

1077

exitcode = EXIT_FAILURE;

1918

perror_plus("socket");

1919

exitcode = EX_OSERR;

1078

1920

#ifdef __linux__

1079

1921

if(restore_loglevel){

1080

1922

ret = klogctl(7, NULL, 0);

1081

1923

if(ret == -1){

1082

perror("klogctl");

1924

perror_plus("klogctl");

1083

1925

}

1084

1926

}

1085

1927

#endif /* __linux__ */

1928

/* Lower privileges */

1929

errno = 0;

1930

ret = seteuid(uid);

1931

if(ret == -1){

1932

perror_plus("seteuid");

1933

}

1086

1934

goto end;

1087

1935

}

1088

1936

strcpy(network.ifr_name, interface);

1089

1937

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

1090

1938

if(ret == -1){

1091

perror("ioctl SIOCGIFFLAGS");

1939

perror_plus("ioctl SIOCGIFFLAGS");

1092

1940

#ifdef __linux__

1093

1941

if(restore_loglevel){

1094

1942

ret = klogctl(7, NULL, 0);

1095

1943

if(ret == -1){

1096

perror("klogctl");

1944

perror_plus("klogctl");

1097

1945

}

1098

1946

}

1099

1947

#endif /* __linux__ */

1100

exitcode = EXIT_FAILURE;

1948

exitcode = EX_OSERR;

1949

/* Lower privileges */

1950

errno = 0;

1951

ret = seteuid(uid);

1952

if(ret == -1){

1953

perror_plus("seteuid");

1954

}

1101

1955

goto end;

1102

1956

}

1103

1957

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

1104

1958

network.ifr_flags |= IFF_UP;

1959

take_down_interface = true;

1105

1960

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

1106

1961

if(ret == -1){

1107

perror("ioctl SIOCSIFFLAGS");

1108

exitcode = EXIT_FAILURE;

1962

take_down_interface = false;

1963

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1964

exitcode = EX_OSERR;

1109

1965

#ifdef __linux__

1110

1966

if(restore_loglevel){

1111

1967

ret = klogctl(7, NULL, 0);

1112

1968

if(ret == -1){

1113

perror("klogctl");

1969

perror_plus("klogctl");

1114

1970

}

1115

1971

}

1116

1972

#endif /* __linux__ */

1973

/* Lower privileges */

1974

errno = 0;

1975

ret = seteuid(uid);

1976

if(ret == -1){

1977

perror_plus("seteuid");

1978

}

1117

1979

goto end;

1118

1980

}

1119

1981

}

1120

/* sleep checking until interface is running */

1982

/* Sleep checking until interface is running.

1983

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

1121

1984

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

1122

1985

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

1123

1986

if(ret == -1){

1124

perror("ioctl SIOCGIFFLAGS");

1987

perror_plus("ioctl SIOCGIFFLAGS");

1125

1988

} else if(network.ifr_flags & IFF_RUNNING){

1126

1989

break;

1127

1990

}

1128

1991

struct timespec sleeptime = { .tv_nsec = 250000000 };

1129

1992

ret = nanosleep(&sleeptime, NULL);

1130

1993

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

1131

perror("nanosleep");

1994

perror_plus("nanosleep");

1132

1995

}

1133

1996

}

1134

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

1135

if(ret == -1){

1136

perror("close");

1997

if(not take_down_interface){

1998

/* We won't need the socket anymore */

1999

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

2000

if(ret == -1){

2001

perror_plus("close");

2002

}

1137

2003

}

1138

2004

#ifdef __linux__

1139

2005

if(restore_loglevel){

1140

2006

/* Restores kernel loglevel to default */

1141

2007

ret = klogctl(7, NULL, 0);

1142

2008

if(ret == -1){

1143

perror("klogctl");

2009

perror_plus("klogctl");

1144

2010

}

1145

2011

}

1146

2012

#endif /* __linux__ */

1147

}

1148

1149

uid = getuid();

1150

gid = getgid();

1151

1152

errno = 0;

1153

setgid(gid);

1154

if(ret == -1){

1155

perror("setgid");

1156

}

1157

1158

ret = setuid(uid);

1159

if(ret == -1){

1160

perror("setuid");

2013

/* Lower privileges */

2014

errno = 0;

2015

/* Lower privileges */

2016

ret = seteuid(uid);

2017

if(ret == -1){

2018

perror_plus("seteuid");

2019

}

2020

}

2021

2022

if(quit_now){

2023

goto end;

1161

2024

}

1162

2025

1163

2026

ret = init_gnutls_global(pubkey, seckey);

1164

2027

if(ret == -1){

1165

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

1166

exitcode = EXIT_FAILURE;

2028

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

2029

exitcode = EX_UNAVAILABLE;

1167

2030

goto end;

1168

2031

} else {

1169

2032

gnutls_initialized = true;

1170

2033

}

1171

2034

2035

if(quit_now){

2036

goto end;

2037

}

2038

1172

2039

if(mkdtemp(tempdir) == NULL){

1173

perror("mkdtemp");

2040

perror_plus("mkdtemp");

1174

2041

goto end;

1175

2042

}

1176

2043

tempdir_created = true;

1177

2044

2045

if(quit_now){

2046

goto end;

2047

}

2048

1178

2049

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

1179

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

1180

exitcode = EXIT_FAILURE;

2050

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

2051

exitcode = EX_UNAVAILABLE;

1181

2052

goto end;

1182

2053

} else {

1183

2054

gpgme_initialized = true;

1184

2055

}

1185

2056

1186

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

1187

if_index = (AvahiIfIndex) if_nametoindex(interface);

1188

if(if_index == 0){

1189

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

1190

exitcode = EXIT_FAILURE;

1191

goto end;

1192

}

2057

if(quit_now){

2058

goto end;

1193

2059

}

1194

2060

1195

2061

if(connect_to != NULL){

1197

2063

/* (Mainly meant for debugging) */

1198

2064

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

1199

2065

if(address == NULL){

1200

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

1201

exitcode = EXIT_FAILURE;

1202

goto end;

1203

}

2066

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

2067

exitcode = EX_USAGE;

2068

goto end;

2069

}

2070

2071

if(quit_now){

2072

goto end;

2073

}

2074

1204

2075

uint16_t port;

1205

2076

errno = 0;

1206

2077

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

1207

2078

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

1208

2079

or tmpmax != (uint16_t)tmpmax){

1209

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

1210

exitcode = EXIT_FAILURE;

1211

goto end;

1212

}

2080

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

2081

exitcode = EX_USAGE;

2082

goto end;

2083

}

2084

2085

if(quit_now){

2086

goto end;

2087

}

2088

1213

2089

port = (uint16_t)tmpmax;

1214

2090

*address = '\0';

1215

address = connect_to;

1216

2091

/* Colon in address indicates IPv6 */

1217

2092

int af;

1218

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

2093

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

1219

2094

af = AF_INET6;

2095

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

2096

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

2097

{

2098

connect_to++;

2099

address[-1] = '\0';

2100

}

1220

2101

} else {

1221

2102

af = AF_INET;

1222

2103

}

1223

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

1224

if(ret < 0){

1225

exitcode = EXIT_FAILURE;

1226

} else {

2104

address = connect_to;

2105

2106

if(quit_now){

2107

goto end;

2108

}

2109

2110

while(not quit_now){

2111

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

2112

if(quit_now or ret == 0){

2113

break;

2114

}

2115

if(debug){

2116

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

2117

(int)retry_interval);

2118

}

2119

sleep((int)retry_interval);

2120

}

2121

2122

if (not quit_now){

1227

2123

exitcode = EXIT_SUCCESS;

1228

2124

}

1229

goto end;

1230

}

1231

2125

2126

goto end;

2127

}

2128

2129

if(quit_now){

2130

goto end;

2131

}

2132

1232

2133

{

1233

2134

AvahiServerConfig config;

1234

2135

/* Do not publish any local Zeroconf records */

1249

2150

1250

2151

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

1251

2152

if(mc.server == NULL){

1252

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

1253

avahi_strerror(error));

1254

exitcode = EXIT_FAILURE;

2153

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

2154

avahi_strerror(error));

2155

exitcode = EX_UNAVAILABLE;

2156

goto end;

2157

}

2158

2159

if(quit_now){

1255

2160

goto end;

1256

2161

}

1257

2162

1258

2163

/* Create the Avahi service browser */

1259

2164

sb = avahi_s_service_browser_new(mc.server, if_index,

1260

AVAHI_PROTO_INET6, "_mandos._tcp",

2165

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1261

2166

NULL, 0, browse_callback, NULL);

1262

2167

if(sb == NULL){

1263

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

1264

avahi_strerror(avahi_server_errno(mc.server)));

1265

exitcode = EXIT_FAILURE;

2168

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

2169

avahi_strerror(avahi_server_errno(mc.server)));

2170

exitcode = EX_UNAVAILABLE;

2171

goto end;

2172

}

2173

2174

if(quit_now){

1266

2175

goto end;

1267

2176

}

1268

2177

1269

2178

/* Run the main loop */

1270

2179

1271

2180

if(debug){

1272

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

1273

}

1274

1275

avahi_simple_poll_loop(mc.simple_poll);

2181

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

2182

}

2183

2184

ret = avahi_loop_with_timeout(mc.simple_poll,

2185

(int)(retry_interval * 1000));

2186

if(debug){

2187

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

2188

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

2189

}

1276

2190

1277

2191

end:

1278

2192

1279

2193

if(debug){

1280

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

2194

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

1281

2195

}

1282

2196

1283

2197

/* Cleanup things */

1300

2214

gpgme_release(mc.ctx);

1301

2215

}

1302

2216

1303

/* Removes the temp directory used by GPGME */

2217

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

2218

has seen */

2219

if(mc.current_server != NULL){

2220

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

2221

while(mc.current_server != NULL){

2222

server *next = mc.current_server->next;

2223

free(mc.current_server);

2224

mc.current_server = next;

2225

}

2226

}

2227

2228

/* Run network hooks */

2229

run_network_hooks("stop", interface, delay);

2230

2231

/* Re-raise priviliges */

2232

{

2233

errno = 0;

2234

ret = seteuid(0);

2235

if(ret == -1){

2236

perror_plus("seteuid");

2237

}

2238

2239

/* Take down the network interface */

2240

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

2241

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

2242

if(ret == -1){

2243

perror_plus("ioctl SIOCGIFFLAGS");

2244

} else if(network.ifr_flags & IFF_UP){

2245

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

2246

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

2247

if(ret == -1){

2248

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2249

}

2250

}

2251

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

2252

if(ret == -1){

2253

perror_plus("close");

2254

}

2255

}

2256

}

2257

/* Lower privileges permanently */

2258

errno = 0;

2259

ret = setuid(uid);

2260

if(ret == -1){

2261

perror_plus("setuid");

2262

}

2263

2264

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

1304

2265

if(tempdir_created){

1305

DIR *d;

1306

struct dirent *direntry;

1307

d = opendir(tempdir);

1308

if(d == NULL){

1309

if(errno != ENOENT){

1310

perror("opendir");

1311

}

1312

} else {

1313

while(true){

1314

direntry = readdir(d);

1315

if(direntry == NULL){

1316

break;

1317

}

1318

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

1319

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

1320

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

1321

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

1322

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

1323

continue;

1324

}

2266

struct dirent **direntries = NULL;

2267

struct dirent *direntry = NULL;

2268

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

2269

alphasort);

2270

if (numentries > 0){

2271

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

2272

direntry = direntries[i];

1325

2273

char *fullname = NULL;

1326

2274

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

1327

2275

direntry->d_name);

1328

2276

if(ret < 0){

1329

perror("asprintf");

2277

perror_plus("asprintf");

1330

2278

continue;

1331

2279

}

1332

2280

ret = remove(fullname);

1333

2281

if(ret == -1){

1334

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

1335

strerror(errno));

2282

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

2283

strerror(errno));

1336

2284

}

1337

2285

free(fullname);

1338

2286

}

1339

closedir(d);

2287

}

2288

2289

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

2290

free(direntries);

2291

if (numentries == -1){

2292

perror_plus("scandir");

1340

2293

}

1341

2294

ret = rmdir(tempdir);

1342

2295

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

1343

perror("rmdir");

1344

}

2296

perror_plus("rmdir");

2297

}

2298

}

2299

2300

if(quit_now){

2301

sigemptyset(&old_sigterm_action.sa_mask);

2302

old_sigterm_action.sa_handler = SIG_DFL;

2303

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

2304

&old_sigterm_action,

2305

NULL));

2306

if(ret == -1){

2307

perror_plus("sigaction");

2308

}

2309

do {

2310

ret = raise(signal_received);

2311

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

2312

if(ret != 0){

2313

perror_plus("raise");

2314

abort();

2315

}

2316

TEMP_FAILURE_RETRY(pause());

1345

2317

}

1346

2318

1347

2319

return exitcode;