/mandos/release : revision 237.2.161

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

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*

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* Everything else is

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*

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

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

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* along with this program. If not, see

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

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*

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

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

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*/

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

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#ifndef _LARGEFILE_SOURCE

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#define _LARGEFILE_SOURCE

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#endif /* not _LARGEFILE_SOURCE */

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#endif

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#ifndef _FILE_OFFSET_BITS

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#define _FILE_OFFSET_BITS 64

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#endif /* not _FILE_OFFSET_BITS */

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#endif

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

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

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stdout, ferror() */

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

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stdout, ferror(), remove() */

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

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

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

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strtof(), abort() */

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

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srand(), 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(), S_ISREG */

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

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

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inet_pton(), connect(),

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getnameinfo() */

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

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inet_pton(), connect() */

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

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

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*/

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

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strtoimax() */

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

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program_invocation_short_name */

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

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

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

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

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

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SIOCSIFFLAGS, if_indextoname(),

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if_nametoindex(), IF_NAMESIZE */

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*/

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

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

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setgid(), pause(), _exit(),

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unlinkat() */

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

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setgid(), pause() */

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

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#include <iso646.h> /* not, or, and */

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#include <argp.h> /* struct argp_option, error_t, struct

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argp_state, struct argp,

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

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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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#include <argz.h> /* argz_add_sep(), argz_next(),

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argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

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argz_count() */

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#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,

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EAI_SYSTEM, gai_strerror() */

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#include <sysexits.h> /* EX_OSERR, EX_USAGE */

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#ifdef __linux__

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88

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

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106

init_gnutls_session(),

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107

GNUTLS_* */

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108

#include <gnutls/openpgp.h>

121

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

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121

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

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122

#define SECKEY "seckey.txt"

135

123

#define PUBKEY "pubkey.txt"

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

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138

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bool debug = false;

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126

static const char mandos_protocol_version[] = "1";

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

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

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

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char *connect_to = NULL;

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const char *hookdir = HOOKDIR;

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int hookdir_fd = -1;

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uid_t uid = 65534;

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gid_t gid = 65534;

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149

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

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typedef struct server{

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const char *ip;

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in_port_t port;

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AvahiIfIndex if_index;

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int af;

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struct timespec last_seen;

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struct server *next;

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struct server *prev;

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} server;

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

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

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131

typedef struct {

132

AvahiSimplePoll *simple_poll;

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133

AvahiServer *server;

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gnutls_certificate_credentials_t cred;

164

135

unsigned int dh_bits;

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136

gnutls_dh_params_t dh_params;

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137

const char *priority;

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138

gpgme_ctx_t ctx;

168

server *current_server;

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char *interfaces;

170

size_t interfaces_size;

171

139

} mandos_context;

172

140

173

/* global so signal handler can reach it*/

174

AvahiSimplePoll *simple_poll;

141

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

142

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

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.dh_bits = 1024, .priority = "SECURE256"

144

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

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145

176

146

sig_atomic_t quit_now = 0;

177

147

int signal_received = 0;

178

148

179

/* Function to use when printing errors */

180

void perror_plus(const char *print_text){

181

int e = errno;

182

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

183

program_invocation_short_name);

184

errno = e;

185

perror(print_text);

186

}

187

188

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

189

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

190

va_list ap;

191

va_start (ap, format);

192

193

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

194

program_invocation_short_name));

195

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

196

}

197

198

149

/*

199

150

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

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

201

152

* "buffer_length" is how much is already used.

202

153

*/

203

__attribute__((nonnull, warn_unused_result))

204

154

size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

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size_t buffer_capacity){

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156

if(buffer_length + BUFFER_SIZE > buffer_capacity){

207

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

208

if(new_buf == NULL){

209

int old_errno = errno;

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free(*buffer);

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errno = old_errno;

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*buffer = NULL;

157

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

158

if(buffer == NULL){

213

159

return 0;

214

160

}

215

*buffer = new_buf;

216

161

buffer_capacity += BUFFER_SIZE;

217

162

}

218

163

return buffer_capacity;

219

164

}

220

165

221

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

222

__attribute__((nonnull, warn_unused_result))

223

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

224

int af, server **current_server){

225

int ret;

226

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

227

if(new_server == NULL){

228

perror_plus("malloc");

229

return false;

230

}

231

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

232

.port = port,

233

.if_index = if_index,

234

.af = af };

235

if(new_server->ip == NULL){

236

perror_plus("strdup");

237

return false;

238

}

239

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

240

if(ret == -1){

241

perror_plus("clock_gettime");

242

return false;

243

}

244

/* Special case of first server */

245

if(*current_server == NULL){

246

new_server->next = new_server;

247

new_server->prev = new_server;

248

*current_server = new_server;

249

} else {

250

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

251

new_server->next = *current_server;

252

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

253

new_server->prev->next = new_server;

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(*current_server)->prev = new_server;

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}

256

return true;

257

}

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259

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/*

260

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* Initialize GPGME.

261

168

*/

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__attribute__((nonnull, warn_unused_result))

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static bool init_gpgme(const char * const seckey,

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const char * const pubkey,

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const char * const tempdir,

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mandos_context *mc){

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static bool init_gpgme(const char *seckey,

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const char *pubkey, const char *tempdir){

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gpgme_error_t rc;

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gpgme_engine_info_t engine_info;

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/*

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

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*/

273

bool import_key(const char * const filename){

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bool import_key(const char *filename){

274

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int ret;

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180

int fd;

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gpgme_data_t pgp_data;

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

279

184

if(fd == -1){

280

perror_plus("open");

185

perror("open");

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186

return false;

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187

}

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

285

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if(rc != GPG_ERR_NO_ERROR){

286

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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193

return false;

289

194

}

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195

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

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rc = gpgme_op_import(mc.ctx, pgp_data);

292

197

if(rc != GPG_ERR_NO_ERROR){

293

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

295

200

return false;

296

201

}

297

202

298

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

299

204

if(ret == -1){

300

perror_plus("close");

205

perror("close");

301

206

}

302

207

gpgme_data_release(pgp_data);

303

208

return true;

304

209

}

305

210

306

211

if(debug){

307

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

212

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

308

213

}

309

214

310

215

/* Init GPGME */

311

216

gpgme_check_version(NULL);

312

217

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

313

218

if(rc != GPG_ERR_NO_ERROR){

314

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

315

gpgme_strsource(rc), gpgme_strerror(rc));

219

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

220

gpgme_strsource(rc), gpgme_strerror(rc));

316

221

return false;

317

222

}

318

223

319

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

224

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

320

225

rc = gpgme_get_engine_info(&engine_info);

321

226

if(rc != GPG_ERR_NO_ERROR){

322

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

323

gpgme_strsource(rc), gpgme_strerror(rc));

227

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

228

gpgme_strsource(rc), gpgme_strerror(rc));

324

229

return false;

325

230

}

326

231

while(engine_info != NULL){

332

237

engine_info = engine_info->next;

333

238

}

334

239

if(engine_info == NULL){

335

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

336

tempdir);

240

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

337

241

return false;

338

242

}

339

243

340

244

/* Create new GPGME "context" */

341

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

245

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

342

246

if(rc != GPG_ERR_NO_ERROR){

343

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

344

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

345

gpgme_strerror(rc));

247

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

248

gpgme_strsource(rc), gpgme_strerror(rc));

346

249

return false;

347

250

}

348

251

357

260

* Decrypt OpenPGP data.

358

261

* Returns -1 on error

359

262

*/

360

__attribute__((nonnull, warn_unused_result))

361

263

static ssize_t pgp_packet_decrypt(const char *cryptotext,

362

264

size_t crypto_size,

363

char **plaintext,

364

mandos_context *mc){

265

char **plaintext){

365

266

gpgme_data_t dh_crypto, dh_plain;

366

267

gpgme_error_t rc;

367

268

ssize_t ret;

369

270

ssize_t plaintext_length = 0;

370

271

371

272

if(debug){

372

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

273

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

373

274

}

374

275

375

276

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

376

277

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

377

278

0);

378

279

if(rc != GPG_ERR_NO_ERROR){

379

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

380

gpgme_strsource(rc), gpgme_strerror(rc));

280

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

281

gpgme_strsource(rc), gpgme_strerror(rc));

381

282

return -1;

382

283

}

383

284

384

285

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

385

286

rc = gpgme_data_new(&dh_plain);

386

287

if(rc != GPG_ERR_NO_ERROR){

387

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

388

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

389

gpgme_strsource(rc), gpgme_strerror(rc));

288

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

289

gpgme_strsource(rc), gpgme_strerror(rc));

390

290

gpgme_data_release(dh_crypto);

391

291

return -1;

392

292

}

393

293

394

294

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

395

295

data buffer */

396

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

296

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

397

297

if(rc != GPG_ERR_NO_ERROR){

398

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

399

gpgme_strsource(rc), gpgme_strerror(rc));

298

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

299

gpgme_strsource(rc), gpgme_strerror(rc));

400

300

plaintext_length = -1;

401

301

if(debug){

402

302

gpgme_decrypt_result_t result;

403

result = gpgme_op_decrypt_result(mc->ctx);

303

result = gpgme_op_decrypt_result(mc.ctx);

404

304

if(result == NULL){

405

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

305

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

406

306

} else {

407

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

408

result->unsupported_algorithm);

409

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

410

result->wrong_key_usage);

307

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

308

result->unsupported_algorithm);

309

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

310

result->wrong_key_usage);

411

311

if(result->file_name != NULL){

412

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

312

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

413

313

}

414

314

gpgme_recipient_t recipient;

415

315

recipient = result->recipients;

416

316

while(recipient != NULL){

417

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

418

gpgme_pubkey_algo_name

419

(recipient->pubkey_algo));

420

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

421

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

422

recipient->status == GPG_ERR_NO_SECKEY

423

? "No" : "Yes");

317

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

318

gpgme_pubkey_algo_name(recipient->pubkey_algo));

319

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

320

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

321

recipient->status == GPG_ERR_NO_SECKEY

322

? "No" : "Yes");

424

323

recipient = recipient->next;

425

324

}

426

325

}

429

328

}

430

329

431

330

if(debug){

432

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

331

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

433

332

}

434

333

435

334

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

436

335

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

437

perror_plus("gpgme_data_seek");

336

perror("gpgme_data_seek");

438

337

plaintext_length = -1;

439

338

goto decrypt_end;

440

339

}

442

341

*plaintext = NULL;

443

342

while(true){

444

343

plaintext_capacity = incbuffer(plaintext,

445

(size_t)plaintext_length,

446

plaintext_capacity);

344

(size_t)plaintext_length,

345

plaintext_capacity);

447

346

if(plaintext_capacity == 0){

448

perror_plus("incbuffer");

449

plaintext_length = -1;

450

goto decrypt_end;

347

perror("incbuffer");

348

plaintext_length = -1;

349

goto decrypt_end;

451

350

}

452

351

453

352

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

458

357

break;

459

358

}

460

359

if(ret < 0){

461

perror_plus("gpgme_data_read");

360

perror("gpgme_data_read");

462

361

plaintext_length = -1;

463

362

goto decrypt_end;

464

363

}

466

365

}

467

366

468

367

if(debug){

469

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

368

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

470

369

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

471

370

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

472

371

}

483

382

return plaintext_length;

484

383

}

485

384

486

__attribute__((warn_unused_result))

487

static const char *safer_gnutls_strerror(int value){

488

const char *ret = gnutls_strerror(value);

385

static const char * safer_gnutls_strerror(int value){

386

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

387

-Wunreachable-code */

489

388

if(ret == NULL)

490

389

ret = "(unknown)";

491

390

return ret;

492

391

}

493

392

494

393

/* GnuTLS log function callback */

495

__attribute__((nonnull))

496

394

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

497

395

const char* string){

498

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

396

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

499

397

}

500

398

501

__attribute__((nonnull, warn_unused_result))

502

399

static int init_gnutls_global(const char *pubkeyfilename,

503

const char *seckeyfilename,

504

mandos_context *mc){

400

const char *seckeyfilename){

505

401

int ret;

506

402

507

403

if(debug){

508

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

404

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

509

405

}

510

406

511

407

ret = gnutls_global_init();

512

408

if(ret != GNUTLS_E_SUCCESS){

513

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

514

safer_gnutls_strerror(ret));

409

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

410

safer_gnutls_strerror(ret));

515

411

return -1;

516

412

}

517

413

524

420

}

525

421

526

422

/* OpenPGP credentials */

527

ret = gnutls_certificate_allocate_credentials(&mc->cred);

423

gnutls_certificate_allocate_credentials(&mc.cred);

528

424

if(ret != GNUTLS_E_SUCCESS){

529

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

530

safer_gnutls_strerror(ret));

425

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

426

from

427

-Wunreachable-code

428

*/

429

safer_gnutls_strerror(ret));

531

430

gnutls_global_deinit();

532

431

return -1;

533

432

}

534

433

535

434

if(debug){

536

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

537

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

538

pubkeyfilename,

539

seckeyfilename);

435

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

436

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

437

seckeyfilename);

540

438

}

541

439

542

440

ret = gnutls_certificate_set_openpgp_key_file

543

(mc->cred, pubkeyfilename, seckeyfilename,

441

(mc.cred, pubkeyfilename, seckeyfilename,

544

442

GNUTLS_OPENPGP_FMT_BASE64);

545

443

if(ret != GNUTLS_E_SUCCESS){

546

fprintf_plus(stderr,

547

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

548

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

549

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

550

safer_gnutls_strerror(ret));

444

fprintf(stderr,

445

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

446

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

447

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

448

safer_gnutls_strerror(ret));

551

449

goto globalfail;

552

450

}

553

451

554

452

/* GnuTLS server initialization */

555

ret = gnutls_dh_params_init(&mc->dh_params);

453

ret = gnutls_dh_params_init(&mc.dh_params);

556

454

if(ret != GNUTLS_E_SUCCESS){

557

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

558

" initialization: %s\n",

559

safer_gnutls_strerror(ret));

455

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

456

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

560

457

goto globalfail;

561

458

}

562

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

459

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

563

460

if(ret != GNUTLS_E_SUCCESS){

564

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

565

safer_gnutls_strerror(ret));

461

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

462

safer_gnutls_strerror(ret));

566

463

goto globalfail;

567

464

}

568

465

569

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

466

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

570

467

571

468

return 0;

572

469

573

470

globalfail:

574

471

575

gnutls_certificate_free_credentials(mc->cred);

472

gnutls_certificate_free_credentials(mc.cred);

576

473

gnutls_global_deinit();

577

gnutls_dh_params_deinit(mc->dh_params);

474

gnutls_dh_params_deinit(mc.dh_params);

578

475

return -1;

579

476

}

580

477

581

__attribute__((nonnull, warn_unused_result))

582

static int init_gnutls_session(gnutls_session_t *session,

583

mandos_context *mc){

478

static int init_gnutls_session(gnutls_session_t *session){

584

479

int ret;

585

480

/* GnuTLS session creation */

586

481

do {

590

485

}

591

486

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

592

487

if(ret != GNUTLS_E_SUCCESS){

593

fprintf_plus(stderr,

594

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

595

safer_gnutls_strerror(ret));

488

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

489

safer_gnutls_strerror(ret));

596

490

}

597

491

598

492

{

599

493

const char *err;

600

494

do {

601

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

495

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

602

496

if(quit_now){

603

497

gnutls_deinit(*session);

604

498

return -1;

605

499

}

606

500

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

607

501

if(ret != GNUTLS_E_SUCCESS){

608

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

609

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

610

safer_gnutls_strerror(ret));

502

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

503

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

504

safer_gnutls_strerror(ret));

611

505

gnutls_deinit(*session);

612

506

return -1;

613

507

}

615

509

616

510

do {

617

511

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

618

mc->cred);

512

mc.cred);

619

513

if(quit_now){

620

514

gnutls_deinit(*session);

621

515

return -1;

622

516

}

623

517

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

624

518

if(ret != GNUTLS_E_SUCCESS){

625

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

626

safer_gnutls_strerror(ret));

519

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

520

safer_gnutls_strerror(ret));

627

521

gnutls_deinit(*session);

628

522

return -1;

629

523

}

631

525

/* ignore client certificate if any. */

632

526

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

633

527

634

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

528

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

635

529

636

530

return 0;

637

531

}

641

535

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

642

536

643

537

/* Called when a Mandos server is found */

644

__attribute__((nonnull, warn_unused_result))

645

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

538

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

646

539

AvahiIfIndex if_index,

647

int af, mandos_context *mc){

540

int af){

648

541

int ret, tcp_sd = -1;

649

542

ssize_t sret;

650

struct sockaddr_storage to;

543

union {

544

struct sockaddr_in in;

545

struct sockaddr_in6 in6;

546

} to;

651

547

char *buffer = NULL;

652

548

char *decrypted_buffer = NULL;

653

549

size_t buffer_length = 0;

657

553

gnutls_session_t session;

658

554

int pf; /* Protocol family */

659

555

660

errno = 0;

661

662

556

if(quit_now){

663

errno = EINTR;

664

557

return -1;

665

558

}

666

559

672

565

pf = PF_INET;

673

566

break;

674

567

default:

675

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

676

errno = EINVAL;

568

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

677

569

return -1;

678

570

}

679

571

680

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

681

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

682

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

683

bool match = false;

684

{

685

char *interface = NULL;

686

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

687

interface))){

688

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

689

match = true;

690

break;

691

}

692

}

693

}

694

if(not match){

695

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

696

connect to the server */

697

if(debug){

698

char interface[IF_NAMESIZE];

699

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

700

perror_plus("if_indextoname");

701

} else {

702

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

703

" \"%s\"\n",

704

if_indextoname((unsigned int)if_index,

705

interface));

706

}

707

}

708

return -1;

709

}

710

}

711

712

ret = init_gnutls_session(&session, mc);

572

ret = init_gnutls_session(&session);

713

573

if(ret != 0){

714

574

return -1;

715

575

}

716

576

717

577

if(debug){

718

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

719

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

578

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

579

"\n", ip, port);

720

580

}

721

581

722

582

tcp_sd = socket(pf, SOCK_STREAM, 0);

723

583

if(tcp_sd < 0){

724

int e = errno;

725

perror_plus("socket");

726

errno = e;

584

perror("socket");

727

585

goto mandos_end;

728

586

}

729

587

730

588

if(quit_now){

731

errno = EINTR;

732

589

goto mandos_end;

733

590

}

734

591

735

592

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

736

593

if(af == AF_INET6){

737

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

738

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

594

to.in6.sin6_family = (sa_family_t)af;

595

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

739

596

} else { /* IPv4 */

740

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

741

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

597

to.in.sin_family = (sa_family_t)af;

598

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

742

599

}

743

600

if(ret < 0 ){

744

int e = errno;

745

perror_plus("inet_pton");

746

errno = e;

601

perror("inet_pton");

747

602

goto mandos_end;

748

603

}

749

604

if(ret == 0){

750

int e = errno;

751

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

752

errno = e;

605

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

753

606

goto mandos_end;

754

607

}

755

608

if(af == AF_INET6){

756

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

757

if(IN6_IS_ADDR_LINKLOCAL

758

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

609

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

610

-Wconversion and

611

-Wunreachable-code */

612

613

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

614

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

615

-Wunreachable-code*/

759

616

if(if_index == AVAHI_IF_UNSPEC){

760

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

761

" incomplete without a network interface\n");

762

errno = EINVAL;

617

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

618

" without a network interface\n");

763

619

goto mandos_end;

764

620

}

765

621

/* Set the network interface number as scope */

766

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

622

to.in6.sin6_scope_id = (uint32_t)if_index;

767

623

}

768

624

} else {

769

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

625

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

626

-Wconversion and

627

-Wunreachable-code */

770

628

}

771

629

772

630

if(quit_now){

773

errno = EINTR;

774

631

goto mandos_end;

775

632

}

776

633

778

635

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

779

636

char interface[IF_NAMESIZE];

780

637

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

781

perror_plus("if_indextoname");

638

perror("if_indextoname");

782

639

} else {

783

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

784

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

640

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

641

ip, interface, port);

785

642

}

786

643

} else {

787

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

788

ip, (uintmax_t)port);

644

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

645

port);

789

646

}

790

647

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

791

648

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

649

const char *pcret;

792

650

if(af == AF_INET6){

793

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

794

sizeof(struct sockaddr_in6),

795

addrstr, sizeof(addrstr), NULL, 0,

796

NI_NUMERICHOST);

651

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

652

sizeof(addrstr));

797

653

} else {

798

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

799

sizeof(struct sockaddr_in),

800

addrstr, sizeof(addrstr), NULL, 0,

801

NI_NUMERICHOST);

654

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

655

sizeof(addrstr));

802

656

}

803

if(ret == EAI_SYSTEM){

804

perror_plus("getnameinfo");

805

} else if(ret != 0) {

806

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

807

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

808

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

657

if(pcret == NULL){

658

perror("inet_ntop");

659

} else {

660

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

661

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

662

}

809

663

}

810

664

}

811

665

812

666

if(quit_now){

813

errno = EINTR;

814

667

goto mandos_end;

815

668

}

816

669

817

670

if(af == AF_INET6){

818

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

819

sizeof(struct sockaddr_in6));

671

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

820

672

} else {

821

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

822

sizeof(struct sockaddr_in));

673

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

823

674

}

824

675

if(ret < 0){

825

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

826

int e = errno;

827

perror_plus("connect");

828

errno = e;

829

}

676

perror("connect");

830

677

goto mandos_end;

831

678

}

832

679

833

680

if(quit_now){

834

errno = EINTR;

835

681

goto mandos_end;

836

682

}

837

683

840

686

while(true){

841

687

size_t out_size = strlen(out);

842

688

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

843

out_size - written));

689

out_size - written));

844

690

if(ret == -1){

845

int e = errno;

846

perror_plus("write");

847

errno = e;

691

perror("write");

848

692

goto mandos_end;

849

693

}

850

694

written += (size_t)ret;

860

704

}

861

705

862

706

if(quit_now){

863

errno = EINTR;

864

707

goto mandos_end;

865

708

}

866

709

}

867

710

868

711

if(debug){

869

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

712

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

870

713

}

871

714

872

715

if(quit_now){

873

errno = EINTR;

874

716

goto mandos_end;

875

717

}

876

718

877

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

878

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

879

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

880

gnutls_transport_set_ptr(session,

881

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

719

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

882

720

883

721

if(quit_now){

884

errno = EINTR;

885

722

goto mandos_end;

886

723

}

887

724

888

725

do {

889

726

ret = gnutls_handshake(session);

890

727

if(quit_now){

891

errno = EINTR;

892

728

goto mandos_end;

893

729

}

894

730

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

895

731

896

732

if(ret != GNUTLS_E_SUCCESS){

897

733

if(debug){

898

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

734

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

899

735

gnutls_perror(ret);

900

736

}

901

errno = EPROTO;

902

737

goto mandos_end;

903

738

}

904

739

905

740

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

906

741

907

742

if(debug){

908

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

909

" %s\n", ip);

743

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

744

ip);

910

745

}

911

746

912

747

while(true){

913

748

914

749

if(quit_now){

915

errno = EINTR;

916

750

goto mandos_end;

917

751

}

918

752

919

753

buffer_capacity = incbuffer(&buffer, buffer_length,

920

buffer_capacity);

754

buffer_capacity);

921

755

if(buffer_capacity == 0){

922

int e = errno;

923

perror_plus("incbuffer");

924

errno = e;

756

perror("incbuffer");

925

757

goto mandos_end;

926

758

}

927

759

928

760

if(quit_now){

929

errno = EINTR;

930

761

goto mandos_end;

931

762

}

932

763

945

776

ret = gnutls_handshake(session);

946

777

947

778

if(quit_now){

948

errno = EINTR;

949

779

goto mandos_end;

950

780

}

951

781

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

952

782

if(ret < 0){

953

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

954

"***\n");

783

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

955

784

gnutls_perror(ret);

956

errno = EPROTO;

957

785

goto mandos_end;

958

786

}

959

787

break;

960

788

default:

961

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

962

" encrypted session with Mandos server\n");

789

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

790

" encrypted session with Mandos server\n");

963

791

gnutls_bye(session, GNUTLS_SHUT_RDWR);

964

errno = EIO;

965

792

goto mandos_end;

966

793

}

967

794

} else {

970

797

}

971

798

972

799

if(debug){

973

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

800

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

974

801

}

975

802

976

803

if(quit_now){

977

errno = EINTR;

978

804

goto mandos_end;

979

805

}

980

806

981

807

do {

982

808

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

983

809

if(quit_now){

984

errno = EINTR;

985

810

goto mandos_end;

986

811

}

987

812

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

988

813

989

814

if(buffer_length > 0){

990

815

ssize_t decrypted_buffer_size;

991

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

992

&decrypted_buffer, mc);

816

decrypted_buffer_size = pgp_packet_decrypt(buffer,

817

buffer_length,

818

&decrypted_buffer);

993

819

if(decrypted_buffer_size >= 0){

994

820

995

821

written = 0;

996

822

while(written < (size_t) decrypted_buffer_size){

997

823

if(quit_now){

998

errno = EINTR;

999

824

goto mandos_end;

1000

825

}

1001

826

1003

828

(size_t)decrypted_buffer_size - written,

1004

829

stdout);

1005

830

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

1006

int e = errno;

1007

831

if(debug){

1008

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

1009

strerror(errno));

832

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

833

strerror(errno));

1010

834

}

1011

errno = e;

1012

835

goto mandos_end;

1013

836

}

1014

837

written += (size_t)ret;

1020

843

/* Shutdown procedure */

1021

844

1022

845

mandos_end:

1023

{

1024

int e = errno;

1025

free(decrypted_buffer);

1026

free(buffer);

1027

if(tcp_sd >= 0){

1028

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

1029

}

1030

if(ret == -1){

1031

if(e == 0){

1032

e = errno;

1033

}

1034

perror_plus("close");

1035

}

1036

gnutls_deinit(session);

1037

errno = e;

1038

if(quit_now){

1039

errno = EINTR;

1040

retval = -1;

1041

}

846

free(decrypted_buffer);

847

free(buffer);

848

if(tcp_sd >= 0){

849

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

850

}

851

if(ret == -1){

852

perror("close");

853

}

854

gnutls_deinit(session);

855

if(quit_now){

856

retval = -1;

1042

857

}

1043

858

return retval;

1044

859

}

1045

860

1046

__attribute__((nonnull))

1047

861

static void resolve_callback(AvahiSServiceResolver *r,

1048

862

AvahiIfIndex interface,

1049

863

AvahiProtocol proto,

1057

871

AVAHI_GCC_UNUSED AvahiStringList *txt,

1058

872

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1059

873

flags,

1060

void *mc){

1061

if(r == NULL){

1062

return;

1063

}

874

AVAHI_GCC_UNUSED void* userdata){

875

assert(r);

1064

876

1065

877

/* Called whenever a service has been resolved successfully or

1066

878

timed out */

1072

884

switch(event){

1073

885

default:

1074

886

case AVAHI_RESOLVER_FAILURE:

1075

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

1076

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

1077

domain,

1078

avahi_strerror(avahi_server_errno

1079

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

887

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

888

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

889

avahi_strerror(avahi_server_errno(mc.server)));

1080

890

break;

1081

891

1082

892

case AVAHI_RESOLVER_FOUND:

1084

894

char ip[AVAHI_ADDRESS_STR_MAX];

1085

895

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

1086

896

if(debug){

1087

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

1088

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

1089

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

897

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

898

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

899

ip, (intmax_t)interface, port);

1090

900

}

1091

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

1092

interface,

1093

avahi_proto_to_af(proto),

1094

mc);

901

int ret = start_mandos_communication(ip, port, interface,

902

avahi_proto_to_af(proto));

1095

903

if(ret == 0){

1096

avahi_simple_poll_quit(simple_poll);

1097

} else {

1098

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

1099

avahi_proto_to_af(proto),

1100

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

1101

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

1102

" list\n", name);

1103

}

904

avahi_simple_poll_quit(mc.simple_poll);

1104

905

}

1105

906

}

1106

907

}

1116

917

const char *domain,

1117

918

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1118

919

flags,

1119

void *mc){

1120

if(b == NULL){

1121

return;

1122

}

920

AVAHI_GCC_UNUSED void* userdata){

921

assert(b);

1123

922

1124

923

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

1125

924

is removed from the LAN */

1132

931

default:

1133

932

case AVAHI_BROWSER_FAILURE:

1134

933

1135

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

1136

avahi_strerror(avahi_server_errno

1137

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

1138

avahi_simple_poll_quit(simple_poll);

934

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

935

avahi_strerror(avahi_server_errno(mc.server)));

936

avahi_simple_poll_quit(mc.simple_poll);

1139

937

return;

1140

938

1141

939

case AVAHI_BROWSER_NEW:

1144

942

the callback function is called the Avahi server will free the

1145

943

resolver for us. */

1146

944

1147

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

1148

interface, protocol, name, type,

1149

domain, protocol, 0,

1150

resolve_callback, mc) == NULL)

1151

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

1152

" %s\n", name,

1153

avahi_strerror(avahi_server_errno

1154

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

945

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

946

name, type, domain, protocol, 0,

947

resolve_callback, NULL) == NULL)

948

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

949

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

1155

950

break;

1156

951

1157

952

case AVAHI_BROWSER_REMOVE:

1160

955

case AVAHI_BROWSER_ALL_FOR_NOW:

1161

956

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1162

957

if(debug){

1163

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

1164

" searching...\n");

958

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

1165

959

}

1166

960

break;

1167

961

}

1168

962

}

1169

963

1170

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

964

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

1171

965

static void handle_sigterm(int sig){

1172

966

if(quit_now){

1173

967

return;

1175

969

quit_now = 1;

1176

970

signal_received = sig;

1177

971

int old_errno = errno;

1178

/* set main loop to exit */

1179

if(simple_poll != NULL){

1180

avahi_simple_poll_quit(simple_poll);

1181

}

1182

errno = old_errno;

1183

}

1184

1185

__attribute__((nonnull, warn_unused_result))

1186

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

1187

int ret;

1188

error_t ret_errno;

1189

1190

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

1191

if(s < 0){

1192

ret_errno = errno;

1193

perror_plus("socket");

1194

errno = ret_errno;

1195

return false;

1196

}

1197

strcpy(ifr->ifr_name, ifname);

1198

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1199

if(ret == -1){

1200

if(debug){

1201

ret_errno = errno;

1202

perror_plus("ioctl SIOCGIFFLAGS");

1203

errno = ret_errno;

1204

}

1205

return false;

1206

}

1207

return true;

1208

}

1209

1210

__attribute__((nonnull, warn_unused_result))

1211

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

1212

1213

/* Reject the loopback device */

1214

if(ifr->ifr_flags & IFF_LOOPBACK){

1215

if(debug){

1216

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

1217

ifname);

1218

}

1219

return false;

1220

}

1221

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

1222

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

1223

if(debug){

1224

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

1225

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

1226

}

1227

return true;

1228

}

1229

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

1230

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

1231

if(debug){

1232

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1233

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

1234

}

1235

return false;

1236

}

1237

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

1238

if(ifr->ifr_flags & IFF_NOARP){

1239

if(debug){

1240

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

1241

ifname);

1242

}

1243

return false;

1244

}

1245

1246

/* Accept this device */

1247

if(debug){

1248

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

1249

}

1250

return true;

1251

}

1252

1253

/*

1254

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

1255

* corresponds to an acceptable network device.

1256

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

1257

*/

1258

__attribute__((nonnull, warn_unused_result))

1259

int good_interface(const struct dirent *if_entry){

1260

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

1261

return 0;

1262

}

1263

1264

struct ifreq ifr;

1265

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

1266

if(debug){

1267

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

1268

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

1269

}

1270

return 0;

1271

}

1272

1273

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

1274

return 0;

1275

}

1276

return 1;

1277

}

1278

1279

/*

1280

* This function determines if a network interface is up.

1281

*/

1282

__attribute__((nonnull, warn_unused_result))

1283

bool interface_is_up(const char *interface){

1284

struct ifreq ifr;

1285

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

1286

if(debug){

1287

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

1288

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

1289

}

1290

return false;

1291

}

1292

1293

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

1294

}

1295

1296

/*

1297

* This function determines if a network interface is running

1298

*/

1299

__attribute__((nonnull, warn_unused_result))

1300

bool interface_is_running(const char *interface){

1301

struct ifreq ifr;

1302

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

1303

if(debug){

1304

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

1305

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

1306

}

1307

return false;

1308

}

1309

1310

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

1311

}

1312

1313

__attribute__((nonnull, pure, warn_unused_result))

1314

int notdotentries(const struct dirent *direntry){

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

return 0;

1321

}

1322

return 1;

1323

}

1324

1325

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

1326

__attribute__((nonnull, warn_unused_result))

1327

int runnable_hook(const struct dirent *direntry){

1328

int ret;

1329

size_t sret;

1330

struct stat st;

1331

1332

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

1333

/* Empty name? */

1334

return 0;

1335

}

1336

1337

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

1338

"abcdefghijklmnopqrstuvwxyz"

1339

"0123456789"

1340

"_.-");

1341

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

1342

/* Contains non-allowed characters */

1343

if(debug){

1344

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

1345

direntry->d_name);

1346

}

1347

return 0;

1348

}

1349

1350

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

1351

if(ret == -1){

1352

if(debug){

1353

perror_plus("Could not stat hook");

1354

}

1355

return 0;

1356

}

1357

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

1358

/* Not a regular file */

1359

if(debug){

1360

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

1361

direntry->d_name);

1362

}

1363

return 0;

1364

}

1365

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

1366

/* Not executable */

1367

if(debug){

1368

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

1369

direntry->d_name);

1370

}

1371

return 0;

1372

}

1373

if(debug){

1374

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

1375

direntry->d_name);

1376

}

1377

return 1;

1378

}

1379

1380

__attribute__((nonnull, warn_unused_result))

1381

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1382

mandos_context *mc){

1383

int ret;

1384

struct timespec now;

1385

struct timespec waited_time;

1386

intmax_t block_time;

1387

1388

while(true){

1389

if(mc->current_server == NULL){

1390

if(debug){

1391

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

1392

" No timeout!\n");

1393

}

1394

ret = avahi_simple_poll_iterate(s, -1);

1395

} else {

1396

if(debug){

1397

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

1398

" it, or wait\n");

1399

}

1400

/* the current time */

1401

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1402

if(ret == -1){

1403

perror_plus("clock_gettime");

1404

return -1;

1405

}

1406

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

1407

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

1408

waited_time.tv_sec = (now.tv_sec

1409

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

1410

waited_time.tv_nsec = (now.tv_nsec

1411

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

1412

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

1413

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

1414

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

1415

block_time = ((retry_interval

1416

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

1417

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

1418

1419

if(debug){

1420

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

1421

block_time);

1422

}

1423

1424

if(block_time <= 0){

1425

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

1426

mc->current_server->port,

1427

mc->current_server->if_index,

1428

mc->current_server->af, mc);

1429

if(ret == 0){

1430

avahi_simple_poll_quit(s);

1431

return 0;

1432

}

1433

ret = clock_gettime(CLOCK_MONOTONIC,

1434

&mc->current_server->last_seen);

1435

if(ret == -1){

1436

perror_plus("clock_gettime");

1437

return -1;

1438

}

1439

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

1440

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

1441

servers, but don't block */

1442

}

1443

1444

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

1445

}

1446

if(ret != 0){

1447

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

1448

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

1449

}

1450

}

1451

}

1452

}

1453

1454

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

1455

__attribute__((warn_unused_result))

1456

error_t raise_privileges(void){

1457

error_t old_errno = errno;

1458

error_t ret_errno = 0;

1459

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

1460

ret_errno = errno;

1461

perror_plus("seteuid");

1462

}

1463

errno = old_errno;

1464

return ret_errno;

1465

}

1466

1467

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

1468

__attribute__((warn_unused_result))

1469

error_t raise_privileges_permanently(void){

1470

error_t old_errno = errno;

1471

error_t ret_errno = raise_privileges();

1472

if(ret_errno != 0){

1473

errno = old_errno;

1474

return ret_errno;

1475

}

1476

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

1477

ret_errno = errno;

1478

perror_plus("seteuid");

1479

}

1480

errno = old_errno;

1481

return ret_errno;

1482

}

1483

1484

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

1485

__attribute__((warn_unused_result))

1486

error_t lower_privileges(void){

1487

error_t old_errno = errno;

1488

error_t ret_errno = 0;

1489

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

1490

ret_errno = errno;

1491

perror_plus("seteuid");

1492

}

1493

errno = old_errno;

1494

return ret_errno;

1495

}

1496

1497

/* Lower privileges permanently */

1498

__attribute__((warn_unused_result))

1499

error_t lower_privileges_permanently(void){

1500

error_t old_errno = errno;

1501

error_t ret_errno = 0;

1502

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

1503

ret_errno = errno;

1504

perror_plus("setuid");

1505

}

1506

errno = old_errno;

1507

return ret_errno;

1508

}

1509

1510

__attribute__((nonnull))

1511

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

1512

const float delay){

1513

struct dirent **direntries;

1514

if(hookdir_fd == -1){

1515

hookdir_fd = open(hookdir, O_RDONLY);

1516

if(hookdir_fd == -1){

1517

if(errno == ENOENT){

1518

if(debug){

1519

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

1520

" found\n", hookdir);

1521

}

1522

} else {

1523

perror_plus("open");

1524

}

1525

return;

1526

}

1527

}

1528

#ifdef __GLIBC__

1529

#if __GLIBC_PREREQ(2, 15)

1530

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

1531

runnable_hook, alphasort);

1532

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

1533

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

1534

alphasort);

1535

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

1536

#else /* not __GLIBC__ */

1537

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

1538

alphasort);

1539

#endif /* not __GLIBC__ */

1540

if(numhooks == -1){

1541

perror_plus("scandir");

1542

return;

1543

}

1544

struct dirent *direntry;

1545

int ret;

1546

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

1547

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

1548

direntry = direntries[i];

1549

if(debug){

1550

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

1551

direntry->d_name);

1552

}

1553

pid_t hook_pid = fork();

1554

if(hook_pid == 0){

1555

/* Child */

1556

/* Raise privileges */

1557

if(raise_privileges_permanently() != 0){

1558

perror_plus("Failed to raise privileges");

1559

_exit(EX_NOPERM);

1560

}

1561

/* Set group */

1562

errno = 0;

1563

ret = setgid(0);

1564

if(ret == -1){

1565

perror_plus("setgid");

1566

_exit(EX_NOPERM);

1567

}

1568

/* Reset supplementary groups */

1569

errno = 0;

1570

ret = setgroups(0, NULL);

1571

if(ret == -1){

1572

perror_plus("setgroups");

1573

_exit(EX_NOPERM);

1574

}

1575

ret = dup2(devnull, STDIN_FILENO);

1576

if(ret == -1){

1577

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

1578

_exit(EX_OSERR);

1579

}

1580

ret = close(devnull);

1581

if(ret == -1){

1582

perror_plus("close");

1583

_exit(EX_OSERR);

1584

}

1585

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1586

if(ret == -1){

1587

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

1588

_exit(EX_OSERR);

1589

}

1590

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

1591

if(ret == -1){

1592

perror_plus("setenv");

1593

_exit(EX_OSERR);

1594

}

1595

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

1596

if(ret == -1){

1597

perror_plus("setenv");

1598

_exit(EX_OSERR);

1599

}

1600

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

1601

if(ret == -1){

1602

perror_plus("setenv");

1603

_exit(EX_OSERR);

1604

}

1605

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

1606

if(ret == -1){

1607

perror_plus("setenv");

1608

_exit(EX_OSERR);

1609

}

1610

char *delaystring;

1611

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

1612

if(ret == -1){

1613

perror_plus("asprintf");

1614

_exit(EX_OSERR);

1615

}

1616

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

1617

if(ret == -1){

1618

free(delaystring);

1619

perror_plus("setenv");

1620

_exit(EX_OSERR);

1621

}

1622

free(delaystring);

1623

if(connect_to != NULL){

1624

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

1625

if(ret == -1){

1626

perror_plus("setenv");

1627

_exit(EX_OSERR);

1628

}

1629

}

1630

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

1631

if(hook_fd == -1){

1632

perror_plus("openat");

1633

_exit(EXIT_FAILURE);

1634

}

1635

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

1636

perror_plus("close");

1637

_exit(EXIT_FAILURE);

1638

}

1639

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

1640

environ) == -1){

1641

perror_plus("fexecve");

1642

_exit(EXIT_FAILURE);

1643

}

1644

} else {

1645

int status;

1646

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

1647

perror_plus("waitpid");

1648

continue;

1649

}

1650

if(WIFEXITED(status)){

1651

if(WEXITSTATUS(status) != 0){

1652

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

1653

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

1654

WEXITSTATUS(status));

1655

continue;

1656

}

1657

} else if(WIFSIGNALED(status)){

1658

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

1659

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

1660

WTERMSIG(status));

1661

continue;

1662

} else {

1663

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

1664

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

1665

continue;

1666

}

1667

}

1668

if(debug){

1669

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

1670

direntry->d_name);

1671

}

1672

}

1673

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

1674

perror_plus("close");

1675

} else {

1676

hookdir_fd = -1;

1677

}

1678

close(devnull);

1679

}

1680

1681

__attribute__((nonnull, warn_unused_result))

1682

error_t bring_up_interface(const char *const interface,

1683

const float delay){

1684

error_t old_errno = errno;

1685

int ret;

1686

struct ifreq network;

1687

unsigned int if_index = if_nametoindex(interface);

1688

if(if_index == 0){

1689

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

1690

errno = old_errno;

1691

return ENXIO;

1692

}

1693

1694

if(quit_now){

1695

errno = old_errno;

1696

return EINTR;

1697

}

1698

1699

if(not interface_is_up(interface)){

1700

error_t ret_errno = 0, ioctl_errno = 0;

1701

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

1702

ret_errno = errno;

1703

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

1704

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

1705

errno = old_errno;

1706

return ret_errno;

1707

}

1708

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

1709

1710

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

1711

if(sd == -1){

1712

ret_errno = errno;

1713

perror_plus("socket");

1714

errno = old_errno;

1715

return ret_errno;

1716

}

1717

1718

if(quit_now){

1719

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

1720

if(ret == -1){

1721

perror_plus("close");

1722

}

1723

errno = old_errno;

1724

return EINTR;

1725

}

1726

1727

if(debug){

1728

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

1729

interface);

1730

}

1731

1732

/* Raise privileges */

1733

ret_errno = raise_privileges();

1734

if(ret_errno != 0){

1735

perror_plus("Failed to raise privileges");

1736

}

1737

1738

#ifdef __linux__

1739

int ret_linux;

1740

bool restore_loglevel = false;

1741

if(ret_errno == 0){

1742

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1743

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

1744

ret_linux = klogctl(8, NULL, 5);

1745

if(ret_linux == -1){

1746

perror_plus("klogctl");

1747

} else {

1748

restore_loglevel = true;

1749

}

1750

}

1751

#endif /* __linux__ */

1752

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

1753

ioctl_errno = errno;

1754

#ifdef __linux__

1755

if(restore_loglevel){

1756

ret_linux = klogctl(7, NULL, 0);

1757

if(ret_linux == -1){

1758

perror_plus("klogctl");

1759

}

1760

}

1761

#endif /* __linux__ */

1762

1763

/* If raise_privileges() succeeded above */

1764

if(ret_errno == 0){

1765

/* Lower privileges */

1766

ret_errno = lower_privileges();

1767

if(ret_errno != 0){

1768

errno = ret_errno;

1769

perror_plus("Failed to lower privileges");

1770

}

1771

}

1772

1773

/* Close the socket */

1774

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

1775

if(ret == -1){

1776

perror_plus("close");

1777

}

1778

1779

if(ret_setflags == -1){

1780

errno = ioctl_errno;

1781

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1782

errno = old_errno;

1783

return ioctl_errno;

1784

}

1785

} else if(debug){

1786

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

1787

interface);

1788

}

1789

1790

/* Sleep checking until interface is running.

1791

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

1792

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

1793

if(interface_is_running(interface)){

1794

break;

1795

}

1796

struct timespec sleeptime = { .tv_nsec = 250000000 };

1797

ret = nanosleep(&sleeptime, NULL);

1798

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

1799

perror_plus("nanosleep");

1800

}

1801

}

1802

1803

errno = old_errno;

1804

return 0;

1805

}

1806

1807

__attribute__((nonnull, warn_unused_result))

1808

error_t take_down_interface(const char *const interface){

1809

error_t old_errno = errno;

1810

struct ifreq network;

1811

unsigned int if_index = if_nametoindex(interface);

1812

if(if_index == 0){

1813

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

1814

errno = old_errno;

1815

return ENXIO;

1816

}

1817

if(interface_is_up(interface)){

1818

error_t ret_errno = 0, ioctl_errno = 0;

1819

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

1820

ret_errno = errno;

1821

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

1822

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

1823

errno = old_errno;

1824

return ret_errno;

1825

}

1826

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

1827

1828

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

1829

if(sd == -1){

1830

ret_errno = errno;

1831

perror_plus("socket");

1832

errno = old_errno;

1833

return ret_errno;

1834

}

1835

1836

if(debug){

1837

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

1838

interface);

1839

}

1840

1841

/* Raise privileges */

1842

ret_errno = raise_privileges();

1843

if(ret_errno != 0){

1844

perror_plus("Failed to raise privileges");

1845

}

1846

1847

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

1848

ioctl_errno = errno;

1849

1850

/* If raise_privileges() succeeded above */

1851

if(ret_errno == 0){

1852

/* Lower privileges */

1853

ret_errno = lower_privileges();

1854

if(ret_errno != 0){

1855

errno = ret_errno;

1856

perror_plus("Failed to lower privileges");

1857

}

1858

}

1859

1860

/* Close the socket */

1861

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

1862

if(ret == -1){

1863

perror_plus("close");

1864

}

1865

1866

if(ret_setflags == -1){

1867

errno = ioctl_errno;

1868

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1869

errno = old_errno;

1870

return ioctl_errno;

1871

}

1872

} else if(debug){

1873

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

1874

interface);

1875

}

1876

1877

errno = old_errno;

1878

return 0;

972

if(mc.simple_poll != NULL){

973

avahi_simple_poll_quit(mc.simple_poll);

974

}

975

errno = old_errno;

1879

976

}

1880

977

1881

978

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

1882

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

1883

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

1884

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

1885

.interfaces = NULL, .interfaces_size = 0 };

1886

979

AvahiSServiceBrowser *sb = NULL;

1887

error_t ret_errno;

980

int error;

1888

981

int ret;

1889

982

intmax_t tmpmax;

1890

983

char *tmp;

1891

984

int exitcode = EXIT_SUCCESS;

1892

char *interfaces_to_take_down = NULL;

1893

size_t interfaces_to_take_down_size = 0;

1894

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

1895

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

1896

char *tempdir = NULL;

985

const char *interface = "eth0";

986

struct ifreq network;

987

int sd = -1;

988

bool take_down_interface = false;

989

uid_t uid;

990

gid_t gid;

991

char *connect_to = NULL;

992

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

993

bool tempdir_created = false;

1897

994

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1898

995

const char *seckey = PATHDIR "/" SECKEY;

1899

996

const char *pubkey = PATHDIR "/" PUBKEY;

1900

char *interfaces_hooks = NULL;

1901

997

1902

998

bool gnutls_initialized = false;

1903

999

bool gpgme_initialized = false;

1904

1000

float delay = 2.5f;

1905

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

1906

retrying the same server again */

1907

1001

1908

1002

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1909

1003

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1915

1009

errno = 0;

1916

1010

ret = setgid(gid);

1917

1011

if(ret == -1){

1918

perror_plus("setgid");

1012

perror("setgid");

1919

1013

}

1920

1014

1921

1015

/* Lower user privileges (temporarily) */

1922

1016

errno = 0;

1923

1017

ret = seteuid(uid);

1924

1018

if(ret == -1){

1925

perror_plus("seteuid");

1019

perror("seteuid");

1926

1020

}

1927

1021

1928

1022

if(quit_now){

1963

1057

.arg = "SECONDS",

1964

1058

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

1965

1059

.group = 2 },

1966

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

1967

.arg = "SECONDS",

1968

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

1969

.group = 2 },

1970

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

1971

.arg = "DIR",

1972

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

1973

.group = 2 },

1974

1060

/*

1975

1061

* These reproduce what we would get without ARGP_NO_HELP

1976

1062

*/

1994

1080

connect_to = arg;

1995

1081

break;

1996

1082

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

1997

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

1998

arg, (int)',');

1999

if(ret_errno != 0){

2000

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

2001

}

1083

interface = arg;

2002

1084

break;

2003

1085

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

2004

1086

seckey = arg;

2024

1106

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

2025

1107

argp_error(state, "Bad delay");

2026

1108

}

2027

case 132: /* --retry */

2028

errno = 0;

2029

retry_interval = strtod(arg, &tmp);

2030

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

2031

or (retry_interval * 1000) > INT_MAX

2032

or retry_interval < 0){

2033

argp_error(state, "Bad retry interval");

2034

}

2035

break;

2036

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

2037

hookdir = arg;

2038

1109

break;

2039

1110

/*

2040

1111

* These reproduce what we would get without ARGP_NO_HELP

2047

1118

argp_state_help(state, state->out_stream,

2048

1119

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

2049

1120

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

2050

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

1121

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

2051

1122

exit(argp_err_exit_status);

2052

1123

break;

2053

1124

default:

2068

1139

case ENOMEM:

2069

1140

default:

2070

1141

errno = ret;

2071

perror_plus("argp_parse");

1142

perror("argp_parse");

2072

1143

exitcode = EX_OSERR;

2073

1144

goto end;

2074

1145

case EINVAL:

2076

1147

goto end;

2077

1148

}

2078

1149

}

2079

2080

{

2081

/* Work around Debian bug #633582:

2082

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

2083

2084

/* Re-raise privileges */

2085

ret_errno = raise_privileges();

2086

if(ret_errno != 0){

2087

errno = ret_errno;

2088

perror_plus("Failed to raise privileges");

2089

} else {

2090

struct stat st;

2091

2092

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

2093

int seckey_fd = open(seckey, O_RDONLY);

2094

if(seckey_fd == -1){

2095

perror_plus("open");

2096

} else {

2097

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

2098

if(ret == -1){

2099

perror_plus("fstat");

2100

} else {

2101

if(S_ISREG(st.st_mode)

2102

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

2103

ret = fchown(seckey_fd, uid, gid);

2104

if(ret == -1){

2105

perror_plus("fchown");

2106

}

2107

}

2108

}

2109

TEMP_FAILURE_RETRY(close(seckey_fd));

2110

}

2111

}

2112

2113

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

2114

int pubkey_fd = open(pubkey, O_RDONLY);

2115

if(pubkey_fd == -1){

2116

perror_plus("open");

2117

} else {

2118

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

2119

if(ret == -1){

2120

perror_plus("fstat");

2121

} else {

2122

if(S_ISREG(st.st_mode)

2123

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

2124

ret = fchown(pubkey_fd, uid, gid);

2125

if(ret == -1){

2126

perror_plus("fchown");

2127

}

2128

}

2129

}

2130

TEMP_FAILURE_RETRY(close(pubkey_fd));

2131

}

2132

}

2133

2134

/* Lower privileges */

2135

ret_errno = lower_privileges();

2136

if(ret_errno != 0){

2137

errno = ret_errno;

2138

perror_plus("Failed to lower privileges");

2139

}

2140

}

2141

}

2142

2143

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

2144

{

2145

char *interface = NULL;

2146

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

2147

interface))){

2148

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

2149

and if_nametoindex(interface) == 0){

2150

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

2151

fprintf_plus(stderr, "Not using nonexisting interface"

2152

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

2153

}

2154

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

2155

interface = NULL;

2156

}

2157

}

2158

}

2159

2160

/* Run network hooks */

2161

{

2162

if(mc.interfaces != NULL){

2163

interfaces_hooks = malloc(mc.interfaces_size);

2164

if(interfaces_hooks == NULL){

2165

perror_plus("malloc");

2166

goto end;

2167

}

2168

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

2169

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

2170

}

2171

run_network_hooks("start", interfaces_hooks != NULL ?

2172

interfaces_hooks : "", delay);

2173

}

2174

1150

2175

1151

if(not debug){

2176

1152

avahi_set_log_function(empty_log);

2180

1156

from the signal handler */

2181

1157

/* Initialize the pseudo-RNG for Avahi */

2182

1158

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

2183

simple_poll = avahi_simple_poll_new();

2184

if(simple_poll == NULL){

2185

fprintf_plus(stderr,

2186

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

2187

exitcode = EX_UNAVAILABLE;

1159

mc.simple_poll = avahi_simple_poll_new();

1160

if(mc.simple_poll == NULL){

1161

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

1162

exitcode = EXIT_FAILURE;

2188

1163

goto end;

2189

1164

}

2190

1165

2191

1166

sigemptyset(&sigterm_action.sa_mask);

2192

1167

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

2193

1168

if(ret == -1){

2194

perror_plus("sigaddset");

2195

exitcode = EX_OSERR;

1169

perror("sigaddset");

1170

exitcode = EXIT_FAILURE;

2196

1171

goto end;

2197

1172

}

2198

1173

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

2199

1174

if(ret == -1){

2200

perror_plus("sigaddset");

2201

exitcode = EX_OSERR;

1175

perror("sigaddset");

1176

exitcode = EXIT_FAILURE;

2202

1177

goto end;

2203

1178

}

2204

1179

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

2205

1180

if(ret == -1){

2206

perror_plus("sigaddset");

2207

exitcode = EX_OSERR;

1181

perror("sigaddset");

1182

exitcode = EXIT_FAILURE;

2208

1183

goto end;

2209

1184

}

2210

1185

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

2213

1188

*/

2214

1189

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

2215

1190

if(ret == -1){

2216

perror_plus("sigaction");

2217

return EX_OSERR;

1191

perror("sigaction");

1192

return EXIT_FAILURE;

2218

1193

}

2219

1194

if(old_sigterm_action.sa_handler != SIG_IGN){

2220

1195

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

2221

1196

if(ret == -1){

2222

perror_plus("sigaction");

2223

exitcode = EX_OSERR;

1197

perror("sigaction");

1198

exitcode = EXIT_FAILURE;

2224

1199

goto end;

2225

1200

}

2226

1201

}

2227

1202

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

2228

1203

if(ret == -1){

2229

perror_plus("sigaction");

2230

return EX_OSERR;

1204

perror("sigaction");

1205

return EXIT_FAILURE;

2231

1206

}

2232

1207

if(old_sigterm_action.sa_handler != SIG_IGN){

2233

1208

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

2234

1209

if(ret == -1){

2235

perror_plus("sigaction");

2236

exitcode = EX_OSERR;

1210

perror("sigaction");

1211

exitcode = EXIT_FAILURE;

2237

1212

goto end;

2238

1213

}

2239

1214

}

2240

1215

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

2241

1216

if(ret == -1){

2242

perror_plus("sigaction");

2243

return EX_OSERR;

1217

perror("sigaction");

1218

return EXIT_FAILURE;

2244

1219

}

2245

1220

if(old_sigterm_action.sa_handler != SIG_IGN){

2246

1221

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

2247

1222

if(ret == -1){

2248

perror_plus("sigaction");

2249

exitcode = EX_OSERR;

1223

perror("sigaction");

1224

exitcode = EXIT_FAILURE;

2250

1225

goto end;

2251

1226

}

2252

1227

}

2253

1228

2254

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

2255

if(mc.interfaces == NULL){

2256

struct dirent **direntries = NULL;

2257

/* Look for any good interfaces */

2258

ret = scandir(sys_class_net, &direntries, good_interface,

2259

alphasort);

2260

if(ret >= 1){

2261

/* Add all found interfaces to interfaces list */

2262

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

2263

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

2264

direntries[i]->d_name);

2265

if(ret_errno != 0){

2266

errno = ret_errno;

2267

perror_plus("argz_add");

2268

continue;

2269

}

2270

if(debug){

2271

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

2272

direntries[i]->d_name);

2273

}

2274

}

2275

free(direntries);

1229

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

1230

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

1231

if_index = (AvahiIfIndex) if_nametoindex(interface);

1232

if(if_index == 0){

1233

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

1234

exitcode = EXIT_FAILURE;

1235

goto end;

1236

}

1237

1238

if(quit_now){

1239

goto end;

1240

}

1241

1242

/* Re-raise priviliges */

1243

errno = 0;

1244

ret = seteuid(0);

1245

if(ret == -1){

1246

perror("seteuid");

1247

}

1248

1249

#ifdef __linux__

1250

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1251

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

1252

ret = klogctl(8, NULL, 5);

1253

bool restore_loglevel = true;

1254

if(ret == -1){

1255

restore_loglevel = false;

1256

perror("klogctl");

1257

}

1258

#endif /* __linux__ */

1259

1260

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1261

if(sd < 0){

1262

perror("socket");

1263

exitcode = EXIT_FAILURE;

1264

#ifdef __linux__

1265

if(restore_loglevel){

1266

ret = klogctl(7, NULL, 0);

1267

if(ret == -1){

1268

perror("klogctl");

1269

}

1270

}

1271

#endif /* __linux__ */

1272

/* Lower privileges */

1273

errno = 0;

1274

ret = seteuid(uid);

1275

if(ret == -1){

1276

perror("seteuid");

1277

}

1278

goto end;

1279

}

1280

strcpy(network.ifr_name, interface);

1281

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

1282

if(ret == -1){

1283

perror("ioctl SIOCGIFFLAGS");

1284

#ifdef __linux__

1285

if(restore_loglevel){

1286

ret = klogctl(7, NULL, 0);

1287

if(ret == -1){

1288

perror("klogctl");

1289

}

1290

}

1291

#endif /* __linux__ */

1292

exitcode = EXIT_FAILURE;

1293

/* Lower privileges */

1294

errno = 0;

1295

ret = seteuid(uid);

1296

if(ret == -1){

1297

perror("seteuid");

1298

}

1299

goto end;

1300

}

1301

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

1302

network.ifr_flags |= IFF_UP;

1303

take_down_interface = true;

1304

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

1305

if(ret == -1){

1306

take_down_interface = false;

1307

perror("ioctl SIOCSIFFLAGS");

1308

exitcode = EXIT_FAILURE;

1309

#ifdef __linux__

1310

if(restore_loglevel){

1311

ret = klogctl(7, NULL, 0);

1312

if(ret == -1){

1313

perror("klogctl");

1314

}

1315

}

1316

#endif /* __linux__ */

1317

/* Lower privileges */

1318

errno = 0;

1319

ret = seteuid(uid);

1320

if(ret == -1){

1321

perror("seteuid");

1322

}

1323

goto end;

1324

}

1325

}

1326

/* sleep checking until interface is running */

1327

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

1328

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

1329

if(ret == -1){

1330

perror("ioctl SIOCGIFFLAGS");

1331

} else if(network.ifr_flags & IFF_RUNNING){

1332

break;

1333

}

1334

struct timespec sleeptime = { .tv_nsec = 250000000 };

1335

ret = nanosleep(&sleeptime, NULL);

1336

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

1337

perror("nanosleep");

1338

}

1339

}

1340

if(not take_down_interface){

1341

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

1342

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

1343

if(ret == -1){

1344

perror("close");

1345

}

1346

}

1347

#ifdef __linux__

1348

if(restore_loglevel){

1349

/* Restores kernel loglevel to default */

1350

ret = klogctl(7, NULL, 0);

1351

if(ret == -1){

1352

perror("klogctl");

1353

}

1354

}

1355

#endif /* __linux__ */

1356

/* Lower privileges */

1357

errno = 0;

1358

if(take_down_interface){

1359

/* Lower privileges */

1360

ret = seteuid(uid);

1361

if(ret == -1){

1362

perror("seteuid");

1363

}

2276

1364

} else {

2277

free(direntries);

2278

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

2279

exitcode = EXIT_FAILURE;

2280

goto end;

2281

}

2282

}

2283

2284

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

2285

{

2286

char *interface = NULL;

2287

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

2288

interface))){

2289

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

2290

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

2291

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

2292

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

2293

interface);

2294

interface = NULL;

2295

while((interface = argz_next(mc.interfaces,

2296

mc.interfaces_size, interface))){

2297

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

2298

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

2299

interface);

2300

interface = NULL;

2301

}

2302

}

2303

break;

2304

}

2305

bool interface_was_up = interface_is_up(interface);

2306

errno = bring_up_interface(interface, delay);

2307

if(not interface_was_up){

2308

if(errno != 0){

2309

perror_plus("Failed to bring up interface");

2310

} else {

2311

errno = argz_add(&interfaces_to_take_down,

2312

&interfaces_to_take_down_size,

2313

interface);

2314

if(errno != 0){

2315

perror_plus("argz_add");

2316

}

2317

}

2318

}

2319

}

2320

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

2321

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

2322

}

2323

}

2324

2325

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

2326

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

2327

if(debug){

2328

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

2329

mc.interfaces);

2330

}

2331

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

1365

/* Lower privileges permanently */

1366

ret = setuid(uid);

1367

if(ret == -1){

1368

perror("setuid");

1369

}

1370

}

2332

1371

}

2333

1372

2334

1373

if(quit_now){

2335

1374

goto end;

2336

1375

}

2337

1376

2338

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

1377

ret = init_gnutls_global(pubkey, seckey);

2339

1378

if(ret == -1){

2340

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

2341

exitcode = EX_UNAVAILABLE;

1379

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

1380

exitcode = EXIT_FAILURE;

2342

1381

goto end;

2343

1382

} else {

2344

1383

gnutls_initialized = true;

2348

1387

goto end;

2349

1388

}

2350

1389

2351

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

2352

tempdir = mkdtemp(run_tempdir);

2353

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

2354

if(debug){

2355

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

2356

run_tempdir, old_tempdir);

2357

}

2358

tempdir = mkdtemp(old_tempdir);

2359

}

2360

if(tempdir == NULL){

2361

perror_plus("mkdtemp");

1390

tempdir_created = true;

1391

if(mkdtemp(tempdir) == NULL){

1392

tempdir_created = false;

1393

perror("mkdtemp");

2362

1394

goto end;

2363

1395

}

2364

1396

2366

1398

goto end;

2367

1399

}

2368

1400

2369

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

2370

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

2371

exitcode = EX_UNAVAILABLE;

1401

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

1402

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

1403

exitcode = EXIT_FAILURE;

2372

1404

goto end;

2373

1405

} else {

2374

1406

gpgme_initialized = true;

2382

1414

/* Connect directly, do not use Zeroconf */

2383

1415

/* (Mainly meant for debugging) */

2384

1416

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

2385

2386

1417

if(address == NULL){

2387

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

2388

exitcode = EX_USAGE;

1418

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

1419

exitcode = EXIT_FAILURE;

2389

1420

goto end;

2390

1421

}

2391

1422

2393

1424

goto end;

2394

1425

}

2395

1426

2396

in_port_t port;

1427

uint16_t port;

2397

1428

errno = 0;

2398

1429

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

2399

1430

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

2400

or tmpmax != (in_port_t)tmpmax){

2401

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

2402

exitcode = EX_USAGE;

1431

or tmpmax != (uint16_t)tmpmax){

1432

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

1433

exitcode = EXIT_FAILURE;

2403

1434

goto end;

2404

1435

}

2405

1436

2406

1437

if(quit_now){

2407

1438

goto end;

2408

1439

}

2409

1440

2410

port = (in_port_t)tmpmax;

1441

port = (uint16_t)tmpmax;

2411

1442

*address = '\0';

1443

address = connect_to;

2412

1444

/* Colon in address indicates IPv6 */

2413

1445

int af;

2414

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

1446

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

2415

1447

af = AF_INET6;

2416

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

2417

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

2418

{

2419

connect_to++;

2420

address[-1] = '\0';

2421

}

2422

1448

} else {

2423

1449

af = AF_INET;

2424

1450

}

2425

address = connect_to;

2426

1451

2427

1452

if(quit_now){

2428

1453

goto end;

2429

1454

}

2430

1455

2431

while(not quit_now){

2432

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

2433

&mc);

2434

if(quit_now or ret == 0){

2435

break;

2436

}

2437

if(debug){

2438

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

2439

(int)retry_interval);

2440

}

2441

sleep((unsigned int)retry_interval);

2442

}

2443

2444

if(not quit_now){

1456

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

1457

if(ret < 0){

1458

exitcode = EXIT_FAILURE;

1459

} else {

2445

1460

exitcode = EXIT_SUCCESS;

2446

1461

}

2447

2448

1462

goto end;

2449

1463

}

2450

1464

2462

1476

config.publish_domain = 0;

2463

1477

2464

1478

/* Allocate a new server */

2465

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2466

&config, NULL, NULL, &ret_errno);

1479

mc.server = avahi_server_new(avahi_simple_poll_get

1480

(mc.simple_poll), &config, NULL,

1481

NULL, &error);

2467

1482

2468

1483

/* Free the Avahi configuration data */

2469

1484

avahi_server_config_free(&config);

2471

1486

2472

1487

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

2473

1488

if(mc.server == NULL){

2474

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

2475

avahi_strerror(ret_errno));

2476

exitcode = EX_UNAVAILABLE;

1489

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

1490

avahi_strerror(error));

1491

exitcode = EXIT_FAILURE;

2477

1492

goto end;

2478

1493

}

2479

1494

2484

1499

/* Create the Avahi service browser */

2485

1500

sb = avahi_s_service_browser_new(mc.server, if_index,

2486

1501

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2487

NULL, 0, browse_callback,

2488

(void *)&mc);

1502

NULL, 0, browse_callback, NULL);

2489

1503

if(sb == NULL){

2490

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

2491

avahi_strerror(avahi_server_errno(mc.server)));

2492

exitcode = EX_UNAVAILABLE;

1504

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

1505

avahi_strerror(avahi_server_errno(mc.server)));

1506

exitcode = EXIT_FAILURE;

2493

1507

goto end;

2494

1508

}

2495

1509

2500

1514

/* Run the main loop */

2501

1515

2502

1516

if(debug){

2503

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

1517

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

2504

1518

}

2505

1519

2506

ret = avahi_loop_with_timeout(simple_poll,

2507

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

2508

if(debug){

2509

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

2510

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

2511

}

1520

avahi_simple_poll_loop(mc.simple_poll);

2512

1521

2513

1522

end:

2514

1523

2515

1524

if(debug){

2516

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

1525

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

2517

1526

}

2518

1527

2519

1528

/* Cleanup things */

2520

free(mc.interfaces);

2521

2522

1529

if(sb != NULL)

2523

1530

avahi_s_service_browser_free(sb);

2524

1531

2525

1532

if(mc.server != NULL)

2526

1533

avahi_server_free(mc.server);

2527

1534

2528

if(simple_poll != NULL)

2529

avahi_simple_poll_free(simple_poll);

1535

if(mc.simple_poll != NULL)

1536

avahi_simple_poll_free(mc.simple_poll);

2530

1537

2531

1538

if(gnutls_initialized){

2532

1539

gnutls_certificate_free_credentials(mc.cred);

2538

1545

gpgme_release(mc.ctx);

2539

1546

}

2540

1547

2541

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

2542

has seen */

2543

if(mc.current_server != NULL){

2544

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

2545

while(mc.current_server != NULL){

2546

server *next = mc.current_server->next;

2547

free(mc.current_server);

2548

mc.current_server = next;

2549

}

2550

}

2551

2552

/* Re-raise privileges */

2553

{

2554

ret_errno = raise_privileges();

2555

if(ret_errno != 0){

2556

perror_plus("Failed to raise privileges");

2557

} else {

2558

2559

/* Run network hooks */

2560

run_network_hooks("stop", interfaces_hooks != NULL ?

2561

interfaces_hooks : "", delay);

2562

2563

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

2564

{

2565

char *interface = NULL;

2566

while((interface=argz_next(interfaces_to_take_down,

2567

interfaces_to_take_down_size,

2568

interface))){

2569

ret_errno = take_down_interface(interface);

2570

if(ret_errno != 0){

2571

errno = ret_errno;

2572

perror_plus("Failed to take down interface");

2573

}

2574

}

2575

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

2576

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

2577

" down\n");

2578

}

2579

}

2580

}

2581

2582

ret_errno = lower_privileges_permanently();

2583

if(ret_errno != 0){

2584

perror_plus("Failed to lower privileges permanently");

2585

}

2586

}

2587

2588

free(interfaces_to_take_down);

2589

free(interfaces_hooks);

2590

2591

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

2592

if(tempdir != NULL){

2593

struct dirent **direntries = NULL;

2594

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

2595

O_NOFOLLOW));

2596

if(tempdir_fd == -1){

2597

perror_plus("open");

2598

} else {

2599

#ifdef __GLIBC__

2600

#if __GLIBC_PREREQ(2, 15)

2601

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

2602

notdotentries, alphasort);

2603

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

2604

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

2605

alphasort);

2606

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

2607

#else /* not __GLIBC__ */

2608

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

2609

alphasort);

2610

#endif /* not __GLIBC__ */

2611

if(numentries > 0){

2612

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

2613

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

2614

if(ret == -1){

2615

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

2616

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

2617

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

2618

}

2619

}

2620

2621

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

2622

free(direntries);

2623

if(numentries == -1){

2624

perror_plus("scandir");

2625

}

2626

ret = rmdir(tempdir);

2627

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

2628

perror_plus("rmdir");

2629

}

2630

}

2631

TEMP_FAILURE_RETRY(close(tempdir_fd));

1548

/* Take down the network interface */

1549

if(take_down_interface){

1550

/* Re-raise priviliges */

1551

errno = 0;

1552

ret = seteuid(0);

1553

if(ret == -1){

1554

perror("seteuid");

1555

}

1556

if(geteuid() == 0){

1557

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

1558

if(ret == -1){

1559

perror("ioctl SIOCGIFFLAGS");

1560

} else if(network.ifr_flags & IFF_UP) {

1561

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

1562

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

1563

if(ret == -1){

1564

perror("ioctl SIOCSIFFLAGS");

1565

}

1566

}

1567

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

1568

if(ret == -1){

1569

perror("close");

1570

}

1571

/* Lower privileges permanently */

1572

errno = 0;

1573

ret = setuid(uid);

1574

if(ret == -1){

1575

perror("setuid");

1576

}

1577

}

1578

}

1579

1580

/* Removes the temp directory used by GPGME */

1581

if(tempdir_created){

1582

DIR *d;

1583

struct dirent *direntry;

1584

d = opendir(tempdir);

1585

if(d == NULL){

1586

if(errno != ENOENT){

1587

perror("opendir");

1588

}

1589

} else {

1590

while(true){

1591

direntry = readdir(d);

1592

if(direntry == NULL){

1593

break;

1594

}

1595

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

1596

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

1597

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

1598

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

1599

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

1600

continue;

1601

}

1602

char *fullname = NULL;

1603

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

1604

direntry->d_name);

1605

if(ret < 0){

1606

perror("asprintf");

1607

continue;

1608

}

1609

ret = remove(fullname);

1610

if(ret == -1){

1611

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

1612

strerror(errno));

1613

}

1614

free(fullname);

1615

}

1616

closedir(d);

1617

}

1618

ret = rmdir(tempdir);

1619

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

1620

perror("rmdir");

2632

1621

}

2633

1622

}

2634

1623

2639

1628

&old_sigterm_action,

2640

1629

NULL));

2641

1630

if(ret == -1){

2642

perror_plus("sigaction");

1631

perror("sigaction");

2643

1632

}

2644

1633

do {

2645

1634

ret = raise(signal_received);

2646

1635

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

2647

1636

if(ret != 0){

2648

perror_plus("raise");

1637

perror("raise");

2649

1638

abort();

2650

1639

}

2651

1640

TEMP_FAILURE_RETRY(pause());