/mandos/trunk : revision 24.1.156

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

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

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asprintf(), strncpy() */

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

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

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#include <sys/ioctl.h> /* ioctl */

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#include <sys/types.h> /* socket(), inet_pton(), sockaddr,

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sockaddr_in6, PF_INET6,

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SOCK_STREAM, uid_t, gid_t, open(),

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opendir(), DIR */

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

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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, EINTR, EINVAL,

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EAI_SYSTEM, ENETUNREACH,

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EHOSTUNREACH, ECONNREFUSED, EPROTO,

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EIO, ENOENT, ENXIO, ENOMEM, EISDIR,

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ENOTEMPTY,

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program_invocation_short_name */

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

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

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

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

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

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SIOCSIFFLAGS, if_indextoname(),

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if_nametoindex(), IF_NAMESIZE */

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*/

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

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

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

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unlinkat() */

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

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setgid(), pause() */

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

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

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

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argp_state, struct argp,

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raise() */

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

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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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#include <sys/wait.h> /* waitpid(), WIFEXITED(),

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WEXITSTATUS(), WTERMSIG() */

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#include <grp.h> /* setgroups() */

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

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argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

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argz_count() */

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

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EAI_SYSTEM, gai_strerror() */

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#ifdef __linux__

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89

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

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init_gnutls_session(),

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108

GNUTLS_* */

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#include <gnutls/openpgp.h>

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* GPGME */

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

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122

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

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#define SECKEY "seckey.txt"

139

124

#define PUBKEY "pubkey.txt"

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

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142

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bool debug = false;

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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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/* 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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typedef struct {

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AvahiSimplePoll *simple_poll;

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AvahiServer *server;

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gnutls_certificate_credentials_t cred;

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136

unsigned int dh_bits;

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gnutls_dh_params_t dh_params;

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const char *priority;

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139

gpgme_ctx_t ctx;

172

server *current_server;

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char *interfaces;

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size_t interfaces_size;

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140

} mandos_context;

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/* global so signal handler can reach it*/

178

AvahiSimplePoll *simple_poll;

142

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

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

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.dh_bits = 1024, .priority = "SECURE256"

145

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

179

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180

147

sig_atomic_t quit_now = 0;

181

148

int signal_received = 0;

182

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183

/* Function to use when printing errors */

184

void perror_plus(const char *print_text){

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int e = errno;

186

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

187

program_invocation_short_name);

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errno = e;

189

perror(print_text);

190

}

191

192

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

193

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

194

va_list ap;

195

va_start (ap, format);

196

197

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

198

program_invocation_short_name));

199

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

200

}

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202

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/*

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

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152

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

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153

* "buffer_length" is how much is already used.

206

154

*/

207

__attribute__((nonnull, warn_unused_result))

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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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if(buffer_length + BUFFER_SIZE > buffer_capacity){

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

212

if(new_buf == NULL){

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int old_errno = errno;

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free(*buffer);

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errno = old_errno;

216

*buffer = NULL;

158

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

159

if(buffer == NULL){

217

160

return 0;

218

161

}

219

*buffer = new_buf;

220

162

buffer_capacity += BUFFER_SIZE;

221

163

}

222

164

return buffer_capacity;

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165

}

224

166

225

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

226

__attribute__((nonnull, warn_unused_result))

227

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

228

int af, server **current_server){

229

int ret;

230

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

231

if(new_server == NULL){

232

perror_plus("malloc");

233

return false;

234

}

235

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

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.port = port,

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.if_index = if_index,

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.af = af };

239

if(new_server->ip == NULL){

240

perror_plus("strdup");

241

free(new_server);

242

return false;

243

}

244

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

245

if(ret == -1){

246

perror_plus("clock_gettime");

247

#ifdef __GNUC__

248

#pragma GCC diagnostic push

249

#pragma GCC diagnostic ignored "-Wcast-qual"

250

#endif

251

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

252

#ifdef __GNUC__

253

#pragma GCC diagnostic pop

254

#endif

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free(new_server);

256

return false;

257

}

258

/* Special case of first server */

259

if(*current_server == NULL){

260

new_server->next = new_server;

261

new_server->prev = new_server;

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*current_server = new_server;

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} else {

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

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new_server->next = *current_server;

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

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new_server->prev->next = new_server;

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(*current_server)->prev = new_server;

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}

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return true;

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}

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273

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/*

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168

* Initialize GPGME.

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169

*/

276

__attribute__((nonnull, warn_unused_result))

277

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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175

284

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/*

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

286

178

*/

287

bool import_key(const char * const filename){

179

bool import_key(const char *filename){

288

180

int ret;

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181

int fd;

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182

gpgme_data_t pgp_data;

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183

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

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if(fd == -1){

294

perror_plus("open");

186

perror("open");

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187

return false;

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}

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

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if(rc != GPG_ERR_NO_ERROR){

300

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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194

return false;

303

195

}

304

196

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

197

rc = gpgme_op_import(mc.ctx, pgp_data);

306

198

if(rc != GPG_ERR_NO_ERROR){

307

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

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gpgme_strsource(rc), gpgme_strerror(rc));

199

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

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gpgme_strsource(rc), gpgme_strerror(rc));

309

201

return false;

310

202

}

311

203

312

ret = close(fd);

204

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

313

205

if(ret == -1){

314

perror_plus("close");

206

perror("close");

315

207

}

316

208

gpgme_data_release(pgp_data);

317

209

return true;

318

210

}

319

211

320

212

if(debug){

321

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

213

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

322

214

}

323

215

324

216

/* Init GPGME */

325

217

gpgme_check_version(NULL);

326

218

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

327

219

if(rc != GPG_ERR_NO_ERROR){

328

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

329

gpgme_strsource(rc), gpgme_strerror(rc));

220

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

221

gpgme_strsource(rc), gpgme_strerror(rc));

330

222

return false;

331

223

}

332

224

333

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

225

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

334

226

rc = gpgme_get_engine_info(&engine_info);

335

227

if(rc != GPG_ERR_NO_ERROR){

336

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

337

gpgme_strsource(rc), gpgme_strerror(rc));

228

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

229

gpgme_strsource(rc), gpgme_strerror(rc));

338

230

return false;

339

231

}

340

232

while(engine_info != NULL){

346

238

engine_info = engine_info->next;

347

239

}

348

240

if(engine_info == NULL){

349

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

350

tempdir);

241

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

351

242

return false;

352

243

}

353

244

354

245

/* Create new GPGME "context" */

355

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

246

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

356

247

if(rc != GPG_ERR_NO_ERROR){

357

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

358

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

359

gpgme_strerror(rc));

248

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

249

gpgme_strsource(rc), gpgme_strerror(rc));

360

250

return false;

361

251

}

362

252

371

261

* Decrypt OpenPGP data.

372

262

* Returns -1 on error

373

263

*/

374

__attribute__((nonnull, warn_unused_result))

375

264

static ssize_t pgp_packet_decrypt(const char *cryptotext,

376

265

size_t crypto_size,

377

char **plaintext,

378

mandos_context *mc){

266

char **plaintext){

379

267

gpgme_data_t dh_crypto, dh_plain;

380

268

gpgme_error_t rc;

381

269

ssize_t ret;

383

271

ssize_t plaintext_length = 0;

384

272

385

273

if(debug){

386

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

274

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

387

275

}

388

276

389

277

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

390

278

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

391

279

0);

392

280

if(rc != GPG_ERR_NO_ERROR){

393

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

394

gpgme_strsource(rc), gpgme_strerror(rc));

281

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

282

gpgme_strsource(rc), gpgme_strerror(rc));

395

283

return -1;

396

284

}

397

285

398

286

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

399

287

rc = gpgme_data_new(&dh_plain);

400

288

if(rc != GPG_ERR_NO_ERROR){

401

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

402

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

403

gpgme_strsource(rc), gpgme_strerror(rc));

289

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

290

gpgme_strsource(rc), gpgme_strerror(rc));

404

291

gpgme_data_release(dh_crypto);

405

292

return -1;

406

293

}

407

294

408

295

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

409

296

data buffer */

410

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

297

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

411

298

if(rc != GPG_ERR_NO_ERROR){

412

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

413

gpgme_strsource(rc), gpgme_strerror(rc));

299

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

300

gpgme_strsource(rc), gpgme_strerror(rc));

414

301

plaintext_length = -1;

415

302

if(debug){

416

303

gpgme_decrypt_result_t result;

417

result = gpgme_op_decrypt_result(mc->ctx);

304

result = gpgme_op_decrypt_result(mc.ctx);

418

305

if(result == NULL){

419

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

306

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

420

307

} else {

421

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

422

result->unsupported_algorithm);

423

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

424

result->wrong_key_usage);

308

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

309

result->unsupported_algorithm);

310

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

311

result->wrong_key_usage);

425

312

if(result->file_name != NULL){

426

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

313

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

427

314

}

428

315

gpgme_recipient_t recipient;

429

316

recipient = result->recipients;

430

317

while(recipient != NULL){

431

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

432

gpgme_pubkey_algo_name

433

(recipient->pubkey_algo));

434

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

435

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

436

recipient->status == GPG_ERR_NO_SECKEY

437

? "No" : "Yes");

318

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

319

gpgme_pubkey_algo_name(recipient->pubkey_algo));

320

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

321

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

322

recipient->status == GPG_ERR_NO_SECKEY

323

? "No" : "Yes");

438

324

recipient = recipient->next;

439

325

}

440

326

}

443

329

}

444

330

445

331

if(debug){

446

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

332

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

447

333

}

448

334

449

335

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

450

336

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

451

perror_plus("gpgme_data_seek");

337

perror("gpgme_data_seek");

452

338

plaintext_length = -1;

453

339

goto decrypt_end;

454

340

}

456

342

*plaintext = NULL;

457

343

while(true){

458

344

plaintext_capacity = incbuffer(plaintext,

459

(size_t)plaintext_length,

460

plaintext_capacity);

345

(size_t)plaintext_length,

346

plaintext_capacity);

461

347

if(plaintext_capacity == 0){

462

perror_plus("incbuffer");

463

plaintext_length = -1;

464

goto decrypt_end;

348

perror("incbuffer");

349

plaintext_length = -1;

350

goto decrypt_end;

465

351

}

466

352

467

353

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

472

358

break;

473

359

}

474

360

if(ret < 0){

475

perror_plus("gpgme_data_read");

361

perror("gpgme_data_read");

476

362

plaintext_length = -1;

477

363

goto decrypt_end;

478

364

}

480

366

}

481

367

482

368

if(debug){

483

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

369

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

484

370

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

485

371

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

486

372

}

497

383

return plaintext_length;

498

384

}

499

385

500

__attribute__((warn_unused_result, const))

501

static const char *safe_string(const char *str){

502

if(str == NULL)

503

return "(unknown)";

504

return str;

505

}

506

507

__attribute__((warn_unused_result))

508

static const char *safer_gnutls_strerror(int value){

509

const char *ret = gnutls_strerror(value);

510

return safe_string(ret);

386

static const char * safer_gnutls_strerror(int value){

387

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

388

-Wunreachable-code */

389

if(ret == NULL)

390

ret = "(unknown)";

391

return ret;

511

392

}

512

393

513

394

/* GnuTLS log function callback */

514

__attribute__((nonnull))

515

395

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

516

396

const char* string){

517

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

397

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

518

398

}

519

399

520

__attribute__((nonnull(1, 2, 4), warn_unused_result))

521

400

static int init_gnutls_global(const char *pubkeyfilename,

522

const char *seckeyfilename,

523

const char *dhparamsfilename,

524

mandos_context *mc){

401

const char *seckeyfilename){

525

402

int ret;

526

unsigned int uret;

527

403

528

404

if(debug){

529

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

405

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

406

}

407

408

ret = gnutls_global_init();

409

if(ret != GNUTLS_E_SUCCESS){

410

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

411

safer_gnutls_strerror(ret));

412

return -1;

530

413

}

531

414

532

415

if(debug){

538

421

}

539

422

540

423

/* OpenPGP credentials */

541

ret = gnutls_certificate_allocate_credentials(&mc->cred);

424

gnutls_certificate_allocate_credentials(&mc.cred);

542

425

if(ret != GNUTLS_E_SUCCESS){

543

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

544

safer_gnutls_strerror(ret));

426

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

427

from

428

-Wunreachable-code

429

*/

430

safer_gnutls_strerror(ret));

431

gnutls_global_deinit();

545

432

return -1;

546

433

}

547

434

548

435

if(debug){

549

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

550

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

551

pubkeyfilename,

552

seckeyfilename);

436

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

437

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

438

seckeyfilename);

553

439

}

554

440

555

441

ret = gnutls_certificate_set_openpgp_key_file

556

(mc->cred, pubkeyfilename, seckeyfilename,

442

(mc.cred, pubkeyfilename, seckeyfilename,

557

443

GNUTLS_OPENPGP_FMT_BASE64);

558

444

if(ret != GNUTLS_E_SUCCESS){

559

fprintf_plus(stderr,

560

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

561

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

562

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

563

safer_gnutls_strerror(ret));

445

fprintf(stderr,

446

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

447

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

448

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

449

safer_gnutls_strerror(ret));

564

450

goto globalfail;

565

451

}

566

452

567

453

/* GnuTLS server initialization */

568

ret = gnutls_dh_params_init(&mc->dh_params);

569

if(ret != GNUTLS_E_SUCCESS){

570

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

571

" initialization: %s\n",

572

safer_gnutls_strerror(ret));

573

goto globalfail;

574

}

575

/* If a Diffie-Hellman parameters file was given, try to use it */

576

if(dhparamsfilename != NULL){

577

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

578

do {

579

int dhpfile = open(dhparamsfilename, O_RDONLY);

580

if(dhpfile == -1){

581

perror_plus("open");

582

dhparamsfilename = NULL;

583

break;

584

}

585

size_t params_capacity = 0;

586

while(true){

587

params_capacity = incbuffer((char **)&params.data,

588

(size_t)params.size,

589

(size_t)params_capacity);

590

if(params_capacity == 0){

591

perror_plus("incbuffer");

592

free(params.data);

593

params.data = NULL;

594

dhparamsfilename = NULL;

595

break;

596

}

597

ssize_t bytes_read = read(dhpfile,

598

params.data + params.size,

599

BUFFER_SIZE);

600

/* EOF */

601

if(bytes_read == 0){

602

break;

603

}

604

/* check bytes_read for failure */

605

if(bytes_read < 0){

606

perror_plus("read");

607

free(params.data);

608

params.data = NULL;

609

dhparamsfilename = NULL;

610

break;

611

}

612

params.size += (unsigned int)bytes_read;

613

}

614

if(params.data == NULL){

615

dhparamsfilename = NULL;

616

}

617

if(dhparamsfilename == NULL){

618

break;

619

}

620

ret = gnutls_dh_params_import_pkcs3(mc->dh_params, &params,

621

GNUTLS_X509_FMT_PEM);

622

if(ret != GNUTLS_E_SUCCESS){

623

fprintf_plus(stderr, "Failed to parse DH parameters in file"

624

" \"%s\": %s\n", dhparamsfilename,

625

safer_gnutls_strerror(ret));

626

dhparamsfilename = NULL;

627

}

628

} while(false);

629

}

630

if(dhparamsfilename == NULL){

631

if(mc->dh_bits == 0){

632

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

633

/* Try to read the private key file */

634

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

635

do {

636

int secfile = open(seckeyfilename, O_RDONLY);

637

if(secfile == -1){

638

perror_plus("open");

639

break;

640

}

641

size_t buffer_capacity = 0;

642

while(true){

643

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

644

(size_t)buffer.size,

645

(size_t)buffer_capacity);

646

if(buffer_capacity == 0){

647

perror_plus("incbuffer");

648

free(buffer.data);

649

buffer.data = NULL;

650

break;

651

}

652

ssize_t bytes_read = read(secfile,

653

buffer.data + buffer.size,

654

BUFFER_SIZE);

655

/* EOF */

656

if(bytes_read == 0){

657

break;

658

}

659

/* check bytes_read for failure */

660

if(bytes_read < 0){

661

perror_plus("read");

662

free(buffer.data);

663

buffer.data = NULL;

664

break;

665

}

666

buffer.size += (unsigned int)bytes_read;

667

}

668

close(secfile);

669

} while(false);

670

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

671

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

672

if(buffer.data != NULL){

673

{

674

gnutls_openpgp_privkey_t privkey = NULL;

675

ret = gnutls_openpgp_privkey_init(&privkey);

676

if(ret != GNUTLS_E_SUCCESS){

677

fprintf_plus(stderr, "Error initializing OpenPGP key"

678

" structure: %s",

679

safer_gnutls_strerror(ret));

680

free(buffer.data);

681

buffer.data = NULL;

682

} else {

683

ret = gnutls_openpgp_privkey_import

684

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

685

if(ret != GNUTLS_E_SUCCESS){

686

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

687

safer_gnutls_strerror(ret));

688

privkey = NULL;

689

}

690

free(buffer.data);

691

buffer.data = NULL;

692

if(privkey != NULL){

693

/* Use private key to suggest an appropriate

694

sec_param */

695

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

696

gnutls_openpgp_privkey_deinit(privkey);

697

if(debug){

698

fprintf_plus(stderr, "This OpenPGP key implies using"

699

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

700

safe_string(gnutls_sec_param_get_name

701

(sec_param)));

702

}

703

}

704

}

705

}

706

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

707

/* Err on the side of caution */

708

sec_param = GNUTLS_SEC_PARAM_ULTRA;

709

if(debug){

710

fprintf_plus(stderr, "Falling back to security parameter"

711

" \"%s\"\n",

712

safe_string(gnutls_sec_param_get_name

713

(sec_param)));

714

}

715

}

716

}

717

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

718

if(uret != 0){

719

mc->dh_bits = uret;

720

if(debug){

721

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

722

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

723

safe_string(gnutls_sec_param_get_name

724

(sec_param)),

725

mc->dh_bits);

726

}

727

} else {

728

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

729

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

730

safe_string(gnutls_sec_param_get_name

731

(sec_param)),

732

safer_gnutls_strerror(ret));

733

goto globalfail;

734

}

735

} else if(debug){

736

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

737

mc->dh_bits);

738

}

739

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

740

if(ret != GNUTLS_E_SUCCESS){

741

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

742

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

743

safer_gnutls_strerror(ret));

744

goto globalfail;

745

}

746

}

747

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

454

ret = gnutls_dh_params_init(&mc.dh_params);

455

if(ret != GNUTLS_E_SUCCESS){

456

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

457

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

458

goto globalfail;

459

}

460

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

461

if(ret != GNUTLS_E_SUCCESS){

462

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

463

safer_gnutls_strerror(ret));

464

goto globalfail;

465

}

466

467

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

748

468

749

469

return 0;

750

470

751

471

globalfail:

752

472

753

gnutls_certificate_free_credentials(mc->cred);

754

gnutls_dh_params_deinit(mc->dh_params);

473

gnutls_certificate_free_credentials(mc.cred);

474

gnutls_global_deinit();

475

gnutls_dh_params_deinit(mc.dh_params);

755

476

return -1;

756

477

}

757

478

758

__attribute__((nonnull, warn_unused_result))

759

static int init_gnutls_session(gnutls_session_t *session,

760

mandos_context *mc){

479

static int init_gnutls_session(gnutls_session_t *session){

761

480

int ret;

762

481

/* GnuTLS session creation */

763

482

do {

767

486

}

768

487

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

769

488

if(ret != GNUTLS_E_SUCCESS){

770

fprintf_plus(stderr,

771

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

772

safer_gnutls_strerror(ret));

489

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

490

safer_gnutls_strerror(ret));

773

491

}

774

492

775

493

{

776

494

const char *err;

777

495

do {

778

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

496

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

779

497

if(quit_now){

780

498

gnutls_deinit(*session);

781

499

return -1;

782

500

}

783

501

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

784

502

if(ret != GNUTLS_E_SUCCESS){

785

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

786

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

787

safer_gnutls_strerror(ret));

503

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

504

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

505

safer_gnutls_strerror(ret));

788

506

gnutls_deinit(*session);

789

507

return -1;

790

508

}

792

510

793

511

do {

794

512

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

795

mc->cred);

513

mc.cred);

796

514

if(quit_now){

797

515

gnutls_deinit(*session);

798

516

return -1;

799

517

}

800

518

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

801

519

if(ret != GNUTLS_E_SUCCESS){

802

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

803

safer_gnutls_strerror(ret));

520

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

521

safer_gnutls_strerror(ret));

804

522

gnutls_deinit(*session);

805

523

return -1;

806

524

}

808

526

/* ignore client certificate if any. */

809

527

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

810

528

529

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

530

811

531

return 0;

812

532

}

813

533

815

535

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

816

536

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

817

537

818

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

819

__attribute__((warn_unused_result))

820

int raise_privileges(void){

821

int old_errno = errno;

822

int ret = 0;

823

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

824

ret = errno;

825

}

826

errno = old_errno;

827

return ret;

828

}

829

830

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

831

__attribute__((warn_unused_result))

832

int raise_privileges_permanently(void){

833

int old_errno = errno;

834

int ret = raise_privileges();

835

if(ret != 0){

836

errno = old_errno;

837

return ret;

838

}

839

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

840

ret = errno;

841

}

842

errno = old_errno;

843

return ret;

844

}

845

846

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

847

__attribute__((warn_unused_result))

848

int lower_privileges(void){

849

int old_errno = errno;

850

int ret = 0;

851

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

852

ret = errno;

853

}

854

errno = old_errno;

855

return ret;

856

}

857

858

/* Lower privileges permanently */

859

__attribute__((warn_unused_result))

860

int lower_privileges_permanently(void){

861

int old_errno = errno;

862

int ret = 0;

863

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

864

ret = errno;

865

}

866

errno = old_errno;

867

return ret;

868

}

869

870

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

871

__attribute__((nonnull, warn_unused_result))

872

static bool add_delete_local_route(const bool add,

873

const char *address,

874

AvahiIfIndex if_index){

875

int ret;

876

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

877

char add_arg[] = "add";

878

char delete_arg[] = "delete";

879

char debug_flag[] = "--debug";

880

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

881

if(pluginhelperdir == NULL){

882

if(debug){

883

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

884

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

885

}

886

return false;

887

}

888

889

char interface[IF_NAMESIZE];

890

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

891

perror_plus("if_indextoname");

892

return false;

893

}

894

895

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

896

if(devnull == -1){

897

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

898

return false;

899

}

900

pid_t pid = fork();

901

if(pid == 0){

902

/* Child */

903

/* Raise privileges */

904

errno = raise_privileges_permanently();

905

if(errno != 0){

906

perror_plus("Failed to raise privileges");

907

/* _exit(EX_NOPERM); */

908

} else {

909

/* Set group */

910

errno = 0;

911

ret = setgid(0);

912

if(ret == -1){

913

perror_plus("setgid");

914

_exit(EX_NOPERM);

915

}

916

/* Reset supplementary groups */

917

errno = 0;

918

ret = setgroups(0, NULL);

919

if(ret == -1){

920

perror_plus("setgroups");

921

_exit(EX_NOPERM);

922

}

923

}

924

ret = dup2(devnull, STDIN_FILENO);

925

if(ret == -1){

926

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

927

_exit(EX_OSERR);

928

}

929

ret = close(devnull);

930

if(ret == -1){

931

perror_plus("close");

932

_exit(EX_OSERR);

933

}

934

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

935

if(ret == -1){

936

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

937

_exit(EX_OSERR);

938

}

939

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

940

O_RDONLY

941

| O_DIRECTORY

942

| O_PATH

943

| O_CLOEXEC));

944

if(helperdir_fd == -1){

945

perror_plus("open");

946

_exit(EX_UNAVAILABLE);

947

}

948

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

949

helper, O_RDONLY));

950

if(helper_fd == -1){

951

perror_plus("openat");

952

close(helperdir_fd);

953

_exit(EX_UNAVAILABLE);

954

}

955

close(helperdir_fd);

956

#ifdef __GNUC__

957

#pragma GCC diagnostic push

958

#pragma GCC diagnostic ignored "-Wcast-qual"

959

#endif

960

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

961

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

962

interface, debug ? debug_flag : NULL, NULL },

963

environ) == -1){

964

#ifdef __GNUC__

965

#pragma GCC diagnostic pop

966

#endif

967

perror_plus("fexecve");

968

_exit(EXIT_FAILURE);

969

}

970

}

971

if(pid == -1){

972

perror_plus("fork");

973

return false;

974

}

975

int status;

976

pid_t pret = -1;

977

errno = 0;

978

do {

979

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

980

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

981

int errno_raising = 0;

982

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

983

errno_raising = errno;

984

perror_plus("Failed to raise privileges in order to"

985

" kill helper program");

986

}

987

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

988

perror_plus("kill");

989

}

990

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

991

perror_plus("Failed to lower privileges after killing"

992

" helper program");

993

}

994

return false;

995

}

996

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

997

if(pret == -1){

998

perror_plus("waitpid");

999

return false;

1000

}

1001

if(WIFEXITED(status)){

1002

if(WEXITSTATUS(status) != 0){

1003

fprintf_plus(stderr, "Error: iprouteadddel exited"

1004

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

1005

return false;

1006

}

1007

return true;

1008

}

1009

if(WIFSIGNALED(status)){

1010

fprintf_plus(stderr, "Error: iprouteadddel died by"

1011

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

1012

return false;

1013

}

1014

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

1015

return false;

1016

}

1017

1018

__attribute__((nonnull, warn_unused_result))

1019

static bool add_local_route(const char *address,

1020

AvahiIfIndex if_index){

1021

if(debug){

1022

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

1023

}

1024

return add_delete_local_route(true, address, if_index);

1025

}

1026

1027

__attribute__((nonnull, warn_unused_result))

1028

static bool delete_local_route(const char *address,

1029

AvahiIfIndex if_index){

1030

if(debug){

1031

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

1032

}

1033

return add_delete_local_route(false, address, if_index);

1034

}

1035

1036

538

/* Called when a Mandos server is found */

1037

__attribute__((nonnull, warn_unused_result))

1038

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

539

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

1039

540

AvahiIfIndex if_index,

1040

int af, mandos_context *mc){

541

int af){

1041

542

int ret, tcp_sd = -1;

1042

543

ssize_t sret;

1043

struct sockaddr_storage to;

544

union {

545

struct sockaddr_in in;

546

struct sockaddr_in6 in6;

547

} to;

1044

548

char *buffer = NULL;

1045

549

char *decrypted_buffer = NULL;

1046

550

size_t buffer_length = 0;

1049

553

int retval = -1;

1050

554

gnutls_session_t session;

1051

555

int pf; /* Protocol family */

1052

bool route_added = false;

1053

556

1054

557

errno = 0;

1055

558

1066

569

pf = PF_INET;

1067

570

break;

1068

571

default:

1069

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

572

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

1070

573

errno = EINVAL;

1071

574

return -1;

1072

575

}

1073

576

1074

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

1075

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

1076

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

1077

bool match = false;

1078

{

1079

char *interface = NULL;

1080

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

1081

interface))){

1082

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

1083

match = true;

1084

break;

1085

}

1086

}

1087

}

1088

if(not match){

1089

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

1090

connect to the server */

1091

if(debug){

1092

char interface[IF_NAMESIZE];

1093

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

1094

perror_plus("if_indextoname");

1095

} else {

1096

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

1097

" \"%s\"\n",

1098

if_indextoname((unsigned int)if_index,

1099

interface));

1100

}

1101

}

1102

return -1;

1103

}

1104

}

1105

1106

ret = init_gnutls_session(&session, mc);

577

ret = init_gnutls_session(&session);

1107

578

if(ret != 0){

1108

579

return -1;

1109

580

}

1110

581

1111

582

if(debug){

1112

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

1113

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

583

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

584

"\n", ip, port);

1114

585

}

1115

586

1116

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

587

tcp_sd = socket(pf, SOCK_STREAM, 0);

1117

588

if(tcp_sd < 0){

1118

589

int e = errno;

1119

perror_plus("socket");

590

perror("socket");

1120

591

errno = e;

1121

592

goto mandos_end;

1122

593

}

1126

597

goto mandos_end;

1127

598

}

1128

599

600

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

1129

601

if(af == AF_INET6){

1130

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

1131

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

1132

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

602

to.in6.sin6_family = (sa_family_t)af;

603

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

1133

604

} else { /* IPv4 */

1134

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

1135

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

1136

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

605

to.in.sin_family = (sa_family_t)af;

606

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

1137

607

}

1138

608

if(ret < 0 ){

1139

609

int e = errno;

1140

perror_plus("inet_pton");

610

perror("inet_pton");

1141

611

errno = e;

1142

612

goto mandos_end;

1143

613

}

1144

614

if(ret == 0){

1145

615

int e = errno;

1146

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

616

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

1147

617

errno = e;

1148

618

goto mandos_end;

1149

619

}

1150

620

if(af == AF_INET6){

1151

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

1152

if(IN6_IS_ADDR_LINKLOCAL

1153

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

621

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

622

-Wconversion and

623

-Wunreachable-code */

624

625

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

626

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

627

-Wunreachable-code*/

1154

628

if(if_index == AVAHI_IF_UNSPEC){

1155

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

1156

" incomplete without a network interface\n");

629

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

630

" without a network interface\n");

1157

631

errno = EINVAL;

1158

632

goto mandos_end;

1159

633

}

1160

634

/* Set the network interface number as scope */

1161

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

635

to.in6.sin6_scope_id = (uint32_t)if_index;

1162

636

}

1163

637

} else {

1164

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

638

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

639

-Wconversion and

640

-Wunreachable-code */

1165

641

}

1166

642

1167

643

if(quit_now){

1173

649

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

1174

650

char interface[IF_NAMESIZE];

1175

651

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

1176

perror_plus("if_indextoname");

652

perror("if_indextoname");

1177

653

} else {

1178

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

1179

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

654

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

655

ip, interface, port);

1180

656

}

1181

657

} else {

1182

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

1183

ip, (uintmax_t)port);

658

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

659

port);

1184

660

}

1185

661

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

1186

662

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

1187

if(af == AF_INET6){

1188

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

1189

sizeof(struct sockaddr_in6),

1190

addrstr, sizeof(addrstr), NULL, 0,

1191

NI_NUMERICHOST);

1192

} else {

1193

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

1194

sizeof(struct sockaddr_in),

1195

addrstr, sizeof(addrstr), NULL, 0,

1196

NI_NUMERICHOST);

1197

}

1198

if(ret == EAI_SYSTEM){

1199

perror_plus("getnameinfo");

1200

} else if(ret != 0) {

1201

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

1202

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

1203

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

1204

}

1205

}

1206

1207

if(quit_now){

1208

errno = EINTR;

1209

goto mandos_end;

1210

}

1211

1212

while(true){

1213

if(af == AF_INET6){

1214

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

1215

sizeof(struct sockaddr_in6));

1216

} else {

1217

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

1218

sizeof(struct sockaddr_in));

1219

}

1220

if(ret < 0){

1221

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

1222

and if_index != AVAHI_IF_UNSPEC

1223

and connect_to == NULL

1224

and not route_added and

1225

((af == AF_INET6 and not

1226

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1227

&to)->sin6_addr)))

1228

or (af == AF_INET and

1229

/* Not a a IPv4LL address */

1230

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

1231

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

1232

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

1233

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

1234

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

1235

connect to a Mandos server announced by Avahi on a server

1236

host with a global address. Work around this by retrying

1237

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

1238

1239

Avahi bug reference:

1240

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

1241

https://bugs.debian.org/587961

1242

*/

1243

if(debug){

1244

fprintf_plus(stderr, "Mandos server unreachable, trying"

1245

" direct route\n");

1246

}

1247

int e = errno;

1248

route_added = add_local_route(ip, if_index);

1249

if(route_added){

1250

continue;

1251

}

1252

errno = e;

1253

}

1254

if(errno != ECONNREFUSED or debug){

1255

int e = errno;

1256

perror_plus("connect");

1257

errno = e;

1258

}

1259

goto mandos_end;

1260

}

1261

1262

if(quit_now){

1263

errno = EINTR;

1264

goto mandos_end;

1265

}

1266

break;

663

const char *pcret;

664

if(af == AF_INET6){

665

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

666

sizeof(addrstr));

667

} else {

668

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

669

sizeof(addrstr));

670

}

671

if(pcret == NULL){

672

perror("inet_ntop");

673

} else {

674

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

675

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

676

}

677

}

678

}

679

680

if(quit_now){

681

errno = EINTR;

682

goto mandos_end;

683

}

684

685

if(af == AF_INET6){

686

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

687

} else {

688

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

689

}

690

if(ret < 0){

691

int e = errno;

692

perror("connect");

693

errno = e;

694

goto mandos_end;

695

}

696

697

if(quit_now){

698

errno = EINTR;

699

goto mandos_end;

1267

700

}

1268

701

1269

702

const char *out = mandos_protocol_version;

1271

704

while(true){

1272

705

size_t out_size = strlen(out);

1273

706

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

1274

out_size - written));

707

out_size - written));

1275

708

if(ret == -1){

1276

709

int e = errno;

1277

perror_plus("write");

710

perror("write");

1278

711

errno = e;

1279

712

goto mandos_end;

1280

713

}

1297

730

}

1298

731

1299

732

if(debug){

1300

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

733

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

1301

734

}

1302

735

1303

736

if(quit_now){

1305

738

goto mandos_end;

1306

739

}

1307

740

1308

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

1309

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

1310

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

1311

gnutls_transport_set_ptr(session,

1312

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

741

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

1313

742

1314

743

if(quit_now){

1315

744

errno = EINTR;

1326

755

1327

756

if(ret != GNUTLS_E_SUCCESS){

1328

757

if(debug){

1329

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

758

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

1330

759

gnutls_perror(ret);

1331

760

}

1332

761

errno = EPROTO;

1336

765

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

1337

766

1338

767

if(debug){

1339

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

1340

" %s\n", ip);

768

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

769

ip);

1341

770

}

1342

771

1343

772

while(true){

1348

777

}

1349

778

1350

779

buffer_capacity = incbuffer(&buffer, buffer_length,

1351

buffer_capacity);

780

buffer_capacity);

1352

781

if(buffer_capacity == 0){

1353

782

int e = errno;

1354

perror_plus("incbuffer");

783

perror("incbuffer");

1355

784

errno = e;

1356

785

goto mandos_end;

1357

786

}

1381

810

}

1382

811

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

1383

812

if(ret < 0){

1384

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

1385

"***\n");

813

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

1386

814

gnutls_perror(ret);

1387

815

errno = EPROTO;

1388

816

goto mandos_end;

1389

817

}

1390

818

break;

1391

819

default:

1392

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

1393

" encrypted session with Mandos server\n");

820

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

821

" encrypted session with Mandos server\n");

1394

822

gnutls_bye(session, GNUTLS_SHUT_RDWR);

1395

823

errno = EIO;

1396

824

goto mandos_end;

1401

829

}

1402

830

1403

831

if(debug){

1404

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

832

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

1405

833

}

1406

834

1407

835

if(quit_now){

1419

847

1420

848

if(buffer_length > 0){

1421

849

ssize_t decrypted_buffer_size;

1422

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

1423

&decrypted_buffer, mc);

850

decrypted_buffer_size = pgp_packet_decrypt(buffer,

851

buffer_length,

852

&decrypted_buffer);

1424

853

if(decrypted_buffer_size >= 0){

1425

854

1426

855

written = 0;

1436

865

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

1437

866

int e = errno;

1438

867

if(debug){

1439

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

1440

strerror(errno));

868

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

869

strerror(errno));

1441

870

}

1442

871

errno = e;

1443

872

goto mandos_end;

1452

881

1453

882

mandos_end:

1454

883

{

1455

if(route_added){

1456

if(not delete_local_route(ip, if_index)){

1457

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

1458

" interface %d", ip, if_index);

1459

}

1460

}

1461

884

int e = errno;

1462

885

free(decrypted_buffer);

1463

886

free(buffer);

1464

887

if(tcp_sd >= 0){

1465

ret = close(tcp_sd);

888

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

1466

889

}

1467

890

if(ret == -1){

1468

891

if(e == 0){

1469

892

e = errno;

1470

893

}

1471

perror_plus("close");

894

perror("close");

1472

895

}

1473

896

gnutls_deinit(session);

1474

errno = e;

1475

897

if(quit_now){

1476

errno = EINTR;

898

e = EINTR;

1477

899

retval = -1;

1478

900

}

901

errno = e;

1479

902

}

1480

903

return retval;

1481

904

}

1482

905

1483

__attribute__((nonnull))

1484

906

static void resolve_callback(AvahiSServiceResolver *r,

1485

907

AvahiIfIndex interface,

1486

908

AvahiProtocol proto,

1494

916

AVAHI_GCC_UNUSED AvahiStringList *txt,

1495

917

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1496

918

flags,

1497

void *mc){

1498

if(r == NULL){

1499

return;

1500

}

919

AVAHI_GCC_UNUSED void* userdata){

920

assert(r);

1501

921

1502

922

/* Called whenever a service has been resolved successfully or

1503

923

timed out */

1504

924

1505

925

if(quit_now){

1506

avahi_s_service_resolver_free(r);

1507

926

return;

1508

927

}

1509

928

1510

929

switch(event){

1511

930

default:

1512

931

case AVAHI_RESOLVER_FAILURE:

1513

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

1514

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

1515

domain,

1516

avahi_strerror(avahi_server_errno

1517

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

932

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

933

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

934

avahi_strerror(avahi_server_errno(mc.server)));

1518

935

break;

1519

936

1520

937

case AVAHI_RESOLVER_FOUND:

1522

939

char ip[AVAHI_ADDRESS_STR_MAX];

1523

940

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

1524

941

if(debug){

1525

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

1526

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

1527

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

942

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

943

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

944

ip, (intmax_t)interface, port);

1528

945

}

1529

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

1530

interface,

1531

avahi_proto_to_af(proto),

1532

mc);

946

int ret = start_mandos_communication(ip, port, interface,

947

avahi_proto_to_af(proto));

1533

948

if(ret == 0){

1534

avahi_simple_poll_quit(simple_poll);

1535

} else {

1536

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

1537

avahi_proto_to_af(proto),

1538

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

1539

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

1540

" list\n", name);

1541

}

949

avahi_simple_poll_quit(mc.simple_poll);

1542

950

}

1543

951

}

1544

952

}

1554

962

const char *domain,

1555

963

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1556

964

flags,

1557

void *mc){

1558

if(b == NULL){

1559

return;

1560

}

965

AVAHI_GCC_UNUSED void* userdata){

966

assert(b);

1561

967

1562

968

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

1563

969

is removed from the LAN */

1570

976

default:

1571

977

case AVAHI_BROWSER_FAILURE:

1572

978

1573

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

1574

avahi_strerror(avahi_server_errno

1575

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

1576

avahi_simple_poll_quit(simple_poll);

979

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

980

avahi_strerror(avahi_server_errno(mc.server)));

981

avahi_simple_poll_quit(mc.simple_poll);

1577

982

return;

1578

983

1579

984

case AVAHI_BROWSER_NEW:

1582

987

the callback function is called the Avahi server will free the

1583

988

resolver for us. */

1584

989

1585

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

1586

interface, protocol, name, type,

1587

domain, protocol, 0,

1588

resolve_callback, mc) == NULL)

1589

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

1590

" %s\n", name,

1591

avahi_strerror(avahi_server_errno

1592

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

990

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

991

name, type, domain, protocol, 0,

992

resolve_callback, NULL) == NULL)

993

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

994

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

1593

995

break;

1594

996

1595

997

case AVAHI_BROWSER_REMOVE:

1598

1000

case AVAHI_BROWSER_ALL_FOR_NOW:

1599

1001

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1600

1002

if(debug){

1601

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

1602

" searching...\n");

1003

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

1603

1004

}

1604

1005

break;

1605

1006

}

1606

1007

}

1607

1008

1608

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

1009

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

1609

1010

static void handle_sigterm(int sig){

1610

1011

if(quit_now){

1611

1012

return;

1613

1014

quit_now = 1;

1614

1015

signal_received = sig;

1615

1016

int old_errno = errno;

1616

/* set main loop to exit */

1617

if(simple_poll != NULL){

1618

avahi_simple_poll_quit(simple_poll);

1619

}

1620

errno = old_errno;

1621

}

1622

1623

__attribute__((nonnull, warn_unused_result))

1624

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

1625

int ret;

1626

int old_errno;

1627

1628

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

1629

if(s < 0){

1630

old_errno = errno;

1631

perror_plus("socket");

1632

errno = old_errno;

1633

return false;

1634

}

1635

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

1636

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

1637

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1638

if(ret == -1){

1639

if(debug){

1640

old_errno = errno;

1641

perror_plus("ioctl SIOCGIFFLAGS");

1642

errno = old_errno;

1643

}

1644

return false;

1645

}

1646

return true;

1647

}

1648

1649

__attribute__((nonnull, warn_unused_result))

1650

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

1651

1652

/* Reject the loopback device */

1653

if(ifr->ifr_flags & IFF_LOOPBACK){

1654

if(debug){

1655

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

1656

ifname);

1657

}

1658

return false;

1659

}

1660

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

1661

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

1662

if(debug){

1663

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

1664

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

1665

}

1666

return true;

1667

}

1668

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

1669

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

1670

if(debug){

1671

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1672

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

1673

}

1674

return false;

1675

}

1676

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

1677

if(ifr->ifr_flags & IFF_NOARP){

1678

if(debug){

1679

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

1680

ifname);

1681

}

1682

return false;

1683

}

1684

1685

/* Accept this device */

1686

if(debug){

1687

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

1688

}

1689

return true;

1690

}

1691

1692

/*

1693

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

1694

* corresponds to an acceptable network device.

1695

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

1696

*/

1697

__attribute__((nonnull, warn_unused_result))

1698

int good_interface(const struct dirent *if_entry){

1699

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

1700

return 0;

1701

}

1702

1703

struct ifreq ifr;

1704

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

1705

if(debug){

1706

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

1707

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

1708

}

1709

return 0;

1710

}

1711

1712

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

1713

return 0;

1714

}

1715

return 1;

1716

}

1717

1718

/*

1719

* This function determines if a network interface is up.

1720

*/

1721

__attribute__((nonnull, warn_unused_result))

1722

bool interface_is_up(const char *interface){

1723

struct ifreq ifr;

1724

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

1725

if(debug){

1726

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

1727

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

1728

}

1729

return false;

1730

}

1731

1732

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

1733

}

1734

1735

/*

1736

* This function determines if a network interface is running

1737

*/

1738

__attribute__((nonnull, warn_unused_result))

1739

bool interface_is_running(const char *interface){

1740

struct ifreq ifr;

1741

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

1742

if(debug){

1743

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

1744

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

1745

}

1746

return false;

1747

}

1748

1749

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

1750

}

1751

1752

__attribute__((nonnull, pure, warn_unused_result))

1753

int notdotentries(const struct dirent *direntry){

1754

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

1755

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

1756

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

1757

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

1758

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

1759

return 0;

1760

}

1761

return 1;

1762

}

1763

1764

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

1765

__attribute__((nonnull, warn_unused_result))

1766

int runnable_hook(const struct dirent *direntry){

1767

int ret;

1768

size_t sret;

1769

struct stat st;

1770

1771

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

1772

/* Empty name? */

1773

return 0;

1774

}

1775

1776

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

1777

"abcdefghijklmnopqrstuvwxyz"

1778

"0123456789"

1779

"_.-");

1780

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

1781

/* Contains non-allowed characters */

1782

if(debug){

1783

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

1784

direntry->d_name);

1785

}

1786

return 0;

1787

}

1788

1789

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

1790

if(ret == -1){

1791

if(debug){

1792

perror_plus("Could not stat hook");

1793

}

1794

return 0;

1795

}

1796

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

1797

/* Not a regular file */

1798

if(debug){

1799

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

1800

direntry->d_name);

1801

}

1802

return 0;

1803

}

1804

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

1805

/* Not executable */

1806

if(debug){

1807

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

1808

direntry->d_name);

1809

}

1810

return 0;

1811

}

1812

if(debug){

1813

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

1814

direntry->d_name);

1815

}

1816

return 1;

1817

}

1818

1819

__attribute__((nonnull, warn_unused_result))

1820

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1821

mandos_context *mc){

1822

int ret;

1823

struct timespec now;

1824

struct timespec waited_time;

1825

intmax_t block_time;

1826

1827

while(true){

1828

if(mc->current_server == NULL){

1829

if(debug){

1830

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

1831

" No timeout!\n");

1832

}

1833

ret = avahi_simple_poll_iterate(s, -1);

1834

} else {

1835

if(debug){

1836

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

1837

" it, or wait\n");

1838

}

1839

/* the current time */

1840

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1841

if(ret == -1){

1842

perror_plus("clock_gettime");

1843

return -1;

1844

}

1845

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

1846

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

1847

waited_time.tv_sec = (now.tv_sec

1848

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

1849

waited_time.tv_nsec = (now.tv_nsec

1850

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

1851

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

1852

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

1853

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

1854

block_time = ((retry_interval

1855

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

1856

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

1857

1858

if(debug){

1859

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

1860

block_time);

1861

}

1862

1863

if(block_time <= 0){

1864

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

1865

mc->current_server->port,

1866

mc->current_server->if_index,

1867

mc->current_server->af, mc);

1868

if(ret == 0){

1869

avahi_simple_poll_quit(s);

1870

return 0;

1871

}

1872

ret = clock_gettime(CLOCK_MONOTONIC,

1873

&mc->current_server->last_seen);

1874

if(ret == -1){

1875

perror_plus("clock_gettime");

1876

return -1;

1877

}

1878

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

1879

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

1880

servers, but don't block */

1881

}

1882

1883

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

1884

}

1885

if(ret != 0){

1886

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

1887

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

1888

}

1889

}

1890

}

1891

}

1892

1893

__attribute__((nonnull))

1894

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

1895

const float delay){

1896

struct dirent **direntries = NULL;

1897

if(hookdir_fd == -1){

1898

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1899

| O_CLOEXEC);

1900

if(hookdir_fd == -1){

1901

if(errno == ENOENT){

1902

if(debug){

1903

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

1904

" found\n", hookdir);

1905

}

1906

} else {

1907

perror_plus("open");

1908

}

1909

return;

1910

}

1911

}

1912

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

1913

runnable_hook, alphasort);

1914

if(numhooks == -1){

1915

perror_plus("scandir");

1916

return;

1917

}

1918

struct dirent *direntry;

1919

int ret;

1920

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

1921

if(devnull == -1){

1922

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

1923

return;

1924

}

1925

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

1926

direntry = direntries[i];

1927

if(debug){

1928

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

1929

direntry->d_name);

1930

}

1931

pid_t hook_pid = fork();

1932

if(hook_pid == 0){

1933

/* Child */

1934

/* Raise privileges */

1935

errno = raise_privileges_permanently();

1936

if(errno != 0){

1937

perror_plus("Failed to raise privileges");

1938

_exit(EX_NOPERM);

1939

}

1940

/* Set group */

1941

errno = 0;

1942

ret = setgid(0);

1943

if(ret == -1){

1944

perror_plus("setgid");

1945

_exit(EX_NOPERM);

1946

}

1947

/* Reset supplementary groups */

1948

errno = 0;

1949

ret = setgroups(0, NULL);

1950

if(ret == -1){

1951

perror_plus("setgroups");

1952

_exit(EX_NOPERM);

1953

}

1954

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

1955

if(ret == -1){

1956

perror_plus("setenv");

1957

_exit(EX_OSERR);

1958

}

1959

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

1960

if(ret == -1){

1961

perror_plus("setenv");

1962

_exit(EX_OSERR);

1963

}

1964

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

1965

if(ret == -1){

1966

perror_plus("setenv");

1967

_exit(EX_OSERR);

1968

}

1969

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

1970

if(ret == -1){

1971

perror_plus("setenv");

1972

_exit(EX_OSERR);

1973

}

1974

char *delaystring;

1975

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

1976

if(ret == -1){

1977

perror_plus("asprintf");

1978

_exit(EX_OSERR);

1979

}

1980

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

1981

if(ret == -1){

1982

free(delaystring);

1983

perror_plus("setenv");

1984

_exit(EX_OSERR);

1985

}

1986

free(delaystring);

1987

if(connect_to != NULL){

1988

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

1989

if(ret == -1){

1990

perror_plus("setenv");

1991

_exit(EX_OSERR);

1992

}

1993

}

1994

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

1995

direntry->d_name,

1996

O_RDONLY));

1997

if(hook_fd == -1){

1998

perror_plus("openat");

1999

_exit(EXIT_FAILURE);

2000

}

2001

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

2002

perror_plus("close");

2003

_exit(EXIT_FAILURE);

2004

}

2005

ret = dup2(devnull, STDIN_FILENO);

2006

if(ret == -1){

2007

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

2008

_exit(EX_OSERR);

2009

}

2010

ret = close(devnull);

2011

if(ret == -1){

2012

perror_plus("close");

2013

_exit(EX_OSERR);

2014

}

2015

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2016

if(ret == -1){

2017

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

2018

_exit(EX_OSERR);

2019

}

2020

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

2021

environ) == -1){

2022

perror_plus("fexecve");

2023

_exit(EXIT_FAILURE);

2024

}

2025

} else {

2026

if(hook_pid == -1){

2027

perror_plus("fork");

2028

free(direntry);

2029

continue;

2030

}

2031

int status;

2032

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

2033

perror_plus("waitpid");

2034

free(direntry);

2035

continue;

2036

}

2037

if(WIFEXITED(status)){

2038

if(WEXITSTATUS(status) != 0){

2039

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

2040

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

2041

WEXITSTATUS(status));

2042

free(direntry);

2043

continue;

2044

}

2045

} else if(WIFSIGNALED(status)){

2046

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

2047

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

2048

WTERMSIG(status));

2049

free(direntry);

2050

continue;

2051

} else {

2052

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

2053

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

2054

free(direntry);

2055

continue;

2056

}

2057

}

2058

if(debug){

2059

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

2060

direntry->d_name);

2061

}

2062

free(direntry);

2063

}

2064

free(direntries);

2065

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

2066

perror_plus("close");

2067

} else {

2068

hookdir_fd = -1;

2069

}

2070

close(devnull);

2071

}

2072

2073

__attribute__((nonnull, warn_unused_result))

2074

int bring_up_interface(const char *const interface,

2075

const float delay){

2076

int old_errno = errno;

2077

int ret;

2078

struct ifreq network;

2079

unsigned int if_index = if_nametoindex(interface);

2080

if(if_index == 0){

2081

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

2082

errno = old_errno;

2083

return ENXIO;

2084

}

2085

2086

if(quit_now){

2087

errno = old_errno;

2088

return EINTR;

2089

}

2090

2091

if(not interface_is_up(interface)){

2092

int ret_errno = 0;

2093

int ioctl_errno = 0;

2094

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

2095

ret_errno = errno;

2096

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

2097

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

2098

errno = old_errno;

2099

return ret_errno;

2100

}

2101

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

2102

2103

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

2104

if(sd == -1){

2105

ret_errno = errno;

2106

perror_plus("socket");

2107

errno = old_errno;

2108

return ret_errno;

2109

}

2110

2111

if(quit_now){

2112

ret = close(sd);

2113

if(ret == -1){

2114

perror_plus("close");

2115

}

2116

errno = old_errno;

2117

return EINTR;

2118

}

2119

2120

if(debug){

2121

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

2122

interface);

2123

}

2124

2125

/* Raise privileges */

2126

ret_errno = raise_privileges();

2127

if(ret_errno != 0){

2128

errno = ret_errno;

2129

perror_plus("Failed to raise privileges");

2130

}

2131

2132

#ifdef __linux__

2133

int ret_linux;

2134

bool restore_loglevel = false;

2135

if(ret_errno == 0){

2136

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2137

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

2138

ret_linux = klogctl(8, NULL, 5);

2139

if(ret_linux == -1){

2140

perror_plus("klogctl");

2141

} else {

2142

restore_loglevel = true;

2143

}

2144

}

2145

#endif /* __linux__ */

2146

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

2147

ioctl_errno = errno;

2148

#ifdef __linux__

2149

if(restore_loglevel){

2150

ret_linux = klogctl(7, NULL, 0);

2151

if(ret_linux == -1){

2152

perror_plus("klogctl");

2153

}

2154

}

2155

#endif /* __linux__ */

2156

2157

/* If raise_privileges() succeeded above */

2158

if(ret_errno == 0){

2159

/* Lower privileges */

2160

ret_errno = lower_privileges();

2161

if(ret_errno != 0){

2162

errno = ret_errno;

2163

perror_plus("Failed to lower privileges");

2164

}

2165

}

2166

2167

/* Close the socket */

2168

ret = close(sd);

2169

if(ret == -1){

2170

perror_plus("close");

2171

}

2172

2173

if(ret_setflags == -1){

2174

errno = ioctl_errno;

2175

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2176

errno = old_errno;

2177

return ioctl_errno;

2178

}

2179

} else if(debug){

2180

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

2181

interface);

2182

}

2183

2184

/* Sleep checking until interface is running.

2185

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

2186

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

2187

if(interface_is_running(interface)){

2188

break;

2189

}

2190

struct timespec sleeptime = { .tv_nsec = 250000000 };

2191

ret = nanosleep(&sleeptime, NULL);

2192

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

2193

perror_plus("nanosleep");

2194

}

2195

}

2196

2197

errno = old_errno;

2198

return 0;

2199

}

2200

2201

__attribute__((nonnull, warn_unused_result))

2202

int take_down_interface(const char *const interface){

2203

int old_errno = errno;

2204

struct ifreq network;

2205

unsigned int if_index = if_nametoindex(interface);

2206

if(if_index == 0){

2207

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

2208

errno = old_errno;

2209

return ENXIO;

2210

}

2211

if(interface_is_up(interface)){

2212

int ret_errno = 0;

2213

int ioctl_errno = 0;

2214

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

2215

ret_errno = errno;

2216

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

2217

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

2218

errno = old_errno;

2219

return ret_errno;

2220

}

2221

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

2222

2223

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

2224

if(sd == -1){

2225

ret_errno = errno;

2226

perror_plus("socket");

2227

errno = old_errno;

2228

return ret_errno;

2229

}

2230

2231

if(debug){

2232

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

2233

interface);

2234

}

2235

2236

/* Raise privileges */

2237

ret_errno = raise_privileges();

2238

if(ret_errno != 0){

2239

errno = ret_errno;

2240

perror_plus("Failed to raise privileges");

2241

}

2242

2243

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

2244

ioctl_errno = errno;

2245

2246

/* If raise_privileges() succeeded above */

2247

if(ret_errno == 0){

2248

/* Lower privileges */

2249

ret_errno = lower_privileges();

2250

if(ret_errno != 0){

2251

errno = ret_errno;

2252

perror_plus("Failed to lower privileges");

2253

}

2254

}

2255

2256

/* Close the socket */

2257

int ret = close(sd);

2258

if(ret == -1){

2259

perror_plus("close");

2260

}

2261

2262

if(ret_setflags == -1){

2263

errno = ioctl_errno;

2264

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2265

errno = old_errno;

2266

return ioctl_errno;

2267

}

2268

} else if(debug){

2269

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

2270

interface);

2271

}

2272

2273

errno = old_errno;

2274

return 0;

1017

if(mc.simple_poll != NULL){

1018

avahi_simple_poll_quit(mc.simple_poll);

1019

}

1020

errno = old_errno;

2275

1021

}

2276

1022

2277

1023

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

2278

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

2279

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

2280

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

2281

.current_server = NULL, .interfaces = NULL,

2282

.interfaces_size = 0 };

2283

1024

AvahiSServiceBrowser *sb = NULL;

2284

error_t ret_errno;

1025

int error;

2285

1026

int ret;

2286

1027

intmax_t tmpmax;

2287

1028

char *tmp;

2288

1029

int exitcode = EXIT_SUCCESS;

2289

char *interfaces_to_take_down = NULL;

2290

size_t interfaces_to_take_down_size = 0;

2291

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

2292

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

2293

char *tempdir = NULL;

1030

const char *interface = "eth0";

1031

struct ifreq network;

1032

int sd = -1;

1033

bool take_down_interface = false;

1034

uid_t uid;

1035

gid_t gid;

1036

char *connect_to = NULL;

1037

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

1038

bool tempdir_created = false;

2294

1039

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2295

1040

const char *seckey = PATHDIR "/" SECKEY;

2296

1041

const char *pubkey = PATHDIR "/" PUBKEY;

2297

const char *dh_params_file = NULL;

2298

char *interfaces_hooks = NULL;

2299

1042

2300

1043

bool gnutls_initialized = false;

2301

1044

bool gpgme_initialized = false;

2302

1045

float delay = 2.5f;

2303

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

2304

retrying the same server again */

2305

1046

2306

1047

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

2307

1048

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

2313

1054

errno = 0;

2314

1055

ret = setgid(gid);

2315

1056

if(ret == -1){

2316

perror_plus("setgid");

1057

perror("setgid");

2317

1058

}

2318

1059

2319

1060

/* Lower user privileges (temporarily) */

2320

1061

errno = 0;

2321

1062

ret = seteuid(uid);

2322

1063

if(ret == -1){

2323

perror_plus("seteuid");

1064

perror("seteuid");

2324

1065

}

2325

1066

2326

1067

if(quit_now){

2353

1094

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

2354

1095

" Diffie-Hellman key exchange",

2355

1096

.group = 2 },

2356

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

2357

.arg = "FILE",

2358

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

2359

" for the Diffie-Hellman key exchange",

2360

.group = 2 },

2361

1097

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

2362

1098

.arg = "STRING",

2363

1099

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

2366

1102

.arg = "SECONDS",

2367

1103

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

2368

1104

.group = 2 },

2369

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

2370

.arg = "SECONDS",

2371

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

2372

.group = 2 },

2373

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

2374

.arg = "DIR",

2375

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

2376

.group = 2 },

2377

1105

/*

2378

1106

* These reproduce what we would get without ARGP_NO_HELP

2379

1107

*/

2397

1125

connect_to = arg;

2398

1126

break;

2399

1127

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

2400

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

2401

arg, (int)',');

2402

if(ret_errno != 0){

2403

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

2404

}

1128

interface = arg;

2405

1129

break;

2406

1130

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

2407

1131

seckey = arg;

2418

1142

}

2419

1143

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

2420

1144

break;

2421

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

2422

dh_params_file = arg;

2423

break;

2424

1145

case 130: /* --priority */

2425

1146

mc.priority = arg;

2426

1147

break;

2430

1151

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

2431

1152

argp_error(state, "Bad delay");

2432

1153

}

2433

case 132: /* --retry */

2434

errno = 0;

2435

retry_interval = strtod(arg, &tmp);

2436

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

2437

or (retry_interval * 1000) > INT_MAX

2438

or retry_interval < 0){

2439

argp_error(state, "Bad retry interval");

2440

}

2441

break;

2442

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

2443

hookdir = arg;

2444

1154

break;

2445

1155

/*

2446

1156

* These reproduce what we would get without ARGP_NO_HELP

2453

1163

argp_state_help(state, state->out_stream,

2454

1164

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

2455

1165

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

2456

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

1166

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

2457

1167

exit(argp_err_exit_status);

2458

1168

break;

2459

1169

default:

2466

1176

.args_doc = "",

2467

1177

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

2468

1178

" passwords from a Mandos server" };

2469

ret_errno = argp_parse(&argp, argc, argv,

2470

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2471

switch(ret_errno){

1179

ret = argp_parse(&argp, argc, argv,

1180

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1181

switch(ret){

2472

1182

case 0:

2473

1183

break;

2474

1184

case ENOMEM:

2475

1185

default:

2476

errno = ret_errno;

2477

perror_plus("argp_parse");

1186

errno = ret;

1187

perror("argp_parse");

2478

1188

exitcode = EX_OSERR;

2479

1189

goto end;

2480

1190

case EINVAL:

2483

1193

}

2484

1194

}

2485

1195

2486

{

2487

/* Work around Debian bug #633582:

2488

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

2489

2490

/* Re-raise privileges */

2491

ret = raise_privileges();

2492

if(ret != 0){

2493

errno = ret;

2494

perror_plus("Failed to raise privileges");

2495

} else {

2496

struct stat st;

2497

2498

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

2499

int seckey_fd = open(seckey, O_RDONLY);

2500

if(seckey_fd == -1){

2501

perror_plus("open");

2502

} else {

2503

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

2504

if(ret == -1){

2505

perror_plus("fstat");

2506

} else {

2507

if(S_ISREG(st.st_mode)

2508

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

2509

ret = fchown(seckey_fd, uid, gid);

2510

if(ret == -1){

2511

perror_plus("fchown");

2512

}

2513

}

2514

}

2515

close(seckey_fd);

2516

}

2517

}

2518

2519

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

2520

int pubkey_fd = open(pubkey, O_RDONLY);

2521

if(pubkey_fd == -1){

2522

perror_plus("open");

2523

} else {

2524

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

2525

if(ret == -1){

2526

perror_plus("fstat");

2527

} else {

2528

if(S_ISREG(st.st_mode)

2529

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

2530

ret = fchown(pubkey_fd, uid, gid);

2531

if(ret == -1){

2532

perror_plus("fchown");

2533

}

2534

}

2535

}

2536

close(pubkey_fd);

2537

}

2538

}

2539

2540

if(dh_params_file != NULL

2541

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

2542

int dhparams_fd = open(dh_params_file, O_RDONLY);

2543

if(dhparams_fd == -1){

2544

perror_plus("open");

2545

} else {

2546

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

2547

if(ret == -1){

2548

perror_plus("fstat");

2549

} else {

2550

if(S_ISREG(st.st_mode)

2551

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

2552

ret = fchown(dhparams_fd, uid, gid);

2553

if(ret == -1){

2554

perror_plus("fchown");

2555

}

2556

}

2557

}

2558

close(dhparams_fd);

2559

}

2560

}

2561

2562

/* Lower privileges */

2563

ret = lower_privileges();

2564

if(ret != 0){

2565

errno = ret;

2566

perror_plus("Failed to lower privileges");

2567

}

2568

}

2569

}

2570

2571

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

2572

{

2573

char *interface = NULL;

2574

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

2575

interface))){

2576

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

2577

and if_nametoindex(interface) == 0){

2578

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

2579

fprintf_plus(stderr, "Not using nonexisting interface"

2580

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

2581

}

2582

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

2583

interface = NULL;

2584

}

2585

}

2586

}

2587

2588

/* Run network hooks */

2589

{

2590

if(mc.interfaces != NULL){

2591

interfaces_hooks = malloc(mc.interfaces_size);

2592

if(interfaces_hooks == NULL){

2593

perror_plus("malloc");

2594

goto end;

2595

}

2596

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

2597

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

2598

}

2599

run_network_hooks("start", interfaces_hooks != NULL ?

2600

interfaces_hooks : "", delay);

2601

}

2602

2603

1196

if(not debug){

2604

1197

avahi_set_log_function(empty_log);

2605

1198

}

2608

1201

from the signal handler */

2609

1202

/* Initialize the pseudo-RNG for Avahi */

2610

1203

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

2611

simple_poll = avahi_simple_poll_new();

2612

if(simple_poll == NULL){

2613

fprintf_plus(stderr,

2614

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

1204

mc.simple_poll = avahi_simple_poll_new();

1205

if(mc.simple_poll == NULL){

1206

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

2615

1207

exitcode = EX_UNAVAILABLE;

2616

1208

goto end;

2617

1209

}

2619

1211

sigemptyset(&sigterm_action.sa_mask);

2620

1212

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

2621

1213

if(ret == -1){

2622

perror_plus("sigaddset");

1214

perror("sigaddset");

2623

1215

exitcode = EX_OSERR;

2624

1216

goto end;

2625

1217

}

2626

1218

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

2627

1219

if(ret == -1){

2628

perror_plus("sigaddset");

1220

perror("sigaddset");

2629

1221

exitcode = EX_OSERR;

2630

1222

goto end;

2631

1223

}

2632

1224

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

2633

1225

if(ret == -1){

2634

perror_plus("sigaddset");

1226

perror("sigaddset");

2635

1227

exitcode = EX_OSERR;

2636

1228

goto end;

2637

1229

}

2641

1233

*/

2642

1234

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

2643

1235

if(ret == -1){

2644

perror_plus("sigaction");

1236

perror("sigaction");

2645

1237

return EX_OSERR;

2646

1238

}

2647

1239

if(old_sigterm_action.sa_handler != SIG_IGN){

2648

1240

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

2649

1241

if(ret == -1){

2650

perror_plus("sigaction");

1242

perror("sigaction");

2651

1243

exitcode = EX_OSERR;

2652

1244

goto end;

2653

1245

}

2654

1246

}

2655

1247

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

2656

1248

if(ret == -1){

2657

perror_plus("sigaction");

1249

perror("sigaction");

2658

1250

return EX_OSERR;

2659

1251

}

2660

1252

if(old_sigterm_action.sa_handler != SIG_IGN){

2661

1253

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

2662

1254

if(ret == -1){

2663

perror_plus("sigaction");

1255

perror("sigaction");

2664

1256

exitcode = EX_OSERR;

2665

1257

goto end;

2666

1258

}

2667

1259

}

2668

1260

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

2669

1261

if(ret == -1){

2670

perror_plus("sigaction");

1262

perror("sigaction");

2671

1263

return EX_OSERR;

2672

1264

}

2673

1265

if(old_sigterm_action.sa_handler != SIG_IGN){

2674

1266

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

2675

1267

if(ret == -1){

2676

perror_plus("sigaction");

1268

perror("sigaction");

2677

1269

exitcode = EX_OSERR;

2678

1270

goto end;

2679

1271

}

2680

1272

}

2681

1273

2682

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

2683

if(mc.interfaces == NULL){

2684

struct dirent **direntries = NULL;

2685

/* Look for any good interfaces */

2686

ret = scandir(sys_class_net, &direntries, good_interface,

2687

alphasort);

2688

if(ret >= 1){

2689

/* Add all found interfaces to interfaces list */

2690

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

2691

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

2692

direntries[i]->d_name);

2693

if(ret_errno != 0){

2694

errno = ret_errno;

2695

perror_plus("argz_add");

2696

free(direntries[i]);

2697

continue;

2698

}

2699

if(debug){

2700

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

2701

direntries[i]->d_name);

2702

}

2703

free(direntries[i]);

2704

}

2705

free(direntries);

1274

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

1275

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

1276

if_index = (AvahiIfIndex) if_nametoindex(interface);

1277

if(if_index == 0){

1278

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

1279

exitcode = EX_UNAVAILABLE;

1280

goto end;

1281

}

1282

1283

if(quit_now){

1284

goto end;

1285

}

1286

1287

/* Re-raise priviliges */

1288

errno = 0;

1289

ret = seteuid(0);

1290

if(ret == -1){

1291

perror("seteuid");

1292

}

1293

1294

#ifdef __linux__

1295

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1296

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

1297

ret = klogctl(8, NULL, 5);

1298

bool restore_loglevel = true;

1299

if(ret == -1){

1300

restore_loglevel = false;

1301

perror("klogctl");

1302

}

1303

#endif /* __linux__ */

1304

1305

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1306

if(sd < 0){

1307

perror("socket");

1308

exitcode = EX_OSERR;

1309

#ifdef __linux__

1310

if(restore_loglevel){

1311

ret = klogctl(7, NULL, 0);

1312

if(ret == -1){

1313

perror("klogctl");

1314

}

1315

}

1316

#endif /* __linux__ */

1317

/* Lower privileges */

1318

errno = 0;

1319

ret = seteuid(uid);

1320

if(ret == -1){

1321

perror("seteuid");

1322

}

1323

goto end;

1324

}

1325

strcpy(network.ifr_name, interface);

1326

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

1327

if(ret == -1){

1328

perror("ioctl SIOCGIFFLAGS");

1329

#ifdef __linux__

1330

if(restore_loglevel){

1331

ret = klogctl(7, NULL, 0);

1332

if(ret == -1){

1333

perror("klogctl");

1334

}

1335

}

1336

#endif /* __linux__ */

1337

exitcode = EX_OSERR;

1338

/* Lower privileges */

1339

errno = 0;

1340

ret = seteuid(uid);

1341

if(ret == -1){

1342

perror("seteuid");

1343

}

1344

goto end;

1345

}

1346

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

1347

network.ifr_flags |= IFF_UP;

1348

take_down_interface = true;

1349

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

1350

if(ret == -1){

1351

take_down_interface = false;

1352

perror("ioctl SIOCSIFFLAGS");

1353

exitcode = EX_OSERR;

1354

#ifdef __linux__

1355

if(restore_loglevel){

1356

ret = klogctl(7, NULL, 0);

1357

if(ret == -1){

1358

perror("klogctl");

1359

}

1360

}

1361

#endif /* __linux__ */

1362

/* Lower privileges */

1363

errno = 0;

1364

ret = seteuid(uid);

1365

if(ret == -1){

1366

perror("seteuid");

1367

}

1368

goto end;

1369

}

1370

}

1371

/* sleep checking until interface is running */

1372

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

1373

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

1374

if(ret == -1){

1375

perror("ioctl SIOCGIFFLAGS");

1376

} else if(network.ifr_flags & IFF_RUNNING){

1377

break;

1378

}

1379

struct timespec sleeptime = { .tv_nsec = 250000000 };

1380

ret = nanosleep(&sleeptime, NULL);

1381

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

1382

perror("nanosleep");

1383

}

1384

}

1385

if(not take_down_interface){

1386

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

1387

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

1388

if(ret == -1){

1389

perror("close");

1390

}

1391

}

1392

#ifdef __linux__

1393

if(restore_loglevel){

1394

/* Restores kernel loglevel to default */

1395

ret = klogctl(7, NULL, 0);

1396

if(ret == -1){

1397

perror("klogctl");

1398

}

1399

}

1400

#endif /* __linux__ */

1401

/* Lower privileges */

1402

errno = 0;

1403

if(take_down_interface){

1404

/* Lower privileges */

1405

ret = seteuid(uid);

1406

if(ret == -1){

1407

perror("seteuid");

1408

}

2706

1409

} else {

2707

if(ret == 0){

2708

free(direntries);

2709

}

2710

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

2711

exitcode = EXIT_FAILURE;

2712

goto end;

2713

}

2714

}

2715

2716

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

2717

{

2718

char *interface = NULL;

2719

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

2720

interface))){

2721

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

2722

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

2723

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

2724

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

2725

interface);

2726

interface = NULL;

2727

while((interface = argz_next(mc.interfaces,

2728

mc.interfaces_size, interface))){

2729

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

2730

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

2731

interface);

2732

interface = NULL;

2733

}

2734

}

2735

break;

2736

}

2737

bool interface_was_up = interface_is_up(interface);

2738

errno = bring_up_interface(interface, delay);

2739

if(not interface_was_up){

2740

if(errno != 0){

2741

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

2742

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

2743

} else {

2744

errno = argz_add(&interfaces_to_take_down,

2745

&interfaces_to_take_down_size,

2746

interface);

2747

if(errno != 0){

2748

perror_plus("argz_add");

2749

}

2750

}

2751

}

2752

}

2753

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

2754

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

2755

}

2756

}

2757

2758

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

2759

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

2760

if(debug){

2761

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

2762

mc.interfaces);

2763

}

2764

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

1410

/* Lower privileges permanently */

1411

ret = setuid(uid);

1412

if(ret == -1){

1413

perror("setuid");

1414

}

1415

}

2765

1416

}

2766

1417

2767

1418

if(quit_now){

2768

1419

goto end;

2769

1420

}

2770

1421

2771

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

1422

ret = init_gnutls_global(pubkey, seckey);

2772

1423

if(ret == -1){

2773

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

1424

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

2774

1425

exitcode = EX_UNAVAILABLE;

2775

1426

goto end;

2776

1427

} else {

2781

1432

goto end;

2782

1433

}

2783

1434

2784

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

2785

tempdir = mkdtemp(run_tempdir);

2786

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

2787

if(debug){

2788

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

2789

run_tempdir, old_tempdir);

2790

}

2791

tempdir = mkdtemp(old_tempdir);

2792

}

2793

if(tempdir == NULL){

2794

perror_plus("mkdtemp");

1435

tempdir_created = true;

1436

if(mkdtemp(tempdir) == NULL){

1437

tempdir_created = false;

1438

perror("mkdtemp");

2795

1439

goto end;

2796

1440

}

2797

1441

2799

1443

goto end;

2800

1444

}

2801

1445

2802

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

2803

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

1446

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

1447

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

2804

1448

exitcode = EX_UNAVAILABLE;

2805

1449

goto end;

2806

1450

} else {

2815

1459

/* Connect directly, do not use Zeroconf */

2816

1460

/* (Mainly meant for debugging) */

2817

1461

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

2818

2819

1462

if(address == NULL){

2820

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

1463

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

2821

1464

exitcode = EX_USAGE;

2822

1465

goto end;

2823

1466

}

2826

1469

goto end;

2827

1470

}

2828

1471

2829

in_port_t port;

1472

uint16_t port;

2830

1473

errno = 0;

2831

1474

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

2832

1475

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

2833

or tmpmax != (in_port_t)tmpmax){

2834

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

1476

or tmpmax != (uint16_t)tmpmax){

1477

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

2835

1478

exitcode = EX_USAGE;

2836

1479

goto end;

2837

1480

}

2838

1481

2839

1482

if(quit_now){

2840

1483

goto end;

2841

1484

}

2842

1485

2843

port = (in_port_t)tmpmax;

1486

port = (uint16_t)tmpmax;

2844

1487

*address = '\0';

1488

address = connect_to;

2845

1489

/* Colon in address indicates IPv6 */

2846

1490

int af;

2847

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

1491

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

2848

1492

af = AF_INET6;

2849

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

2850

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

2851

{

2852

connect_to++;

2853

address[-1] = '\0';

2854

}

2855

1493

} else {

2856

1494

af = AF_INET;

2857

1495

}

2858

address = connect_to;

2859

1496

2860

1497

if(quit_now){

2861

1498

goto end;

2862

1499

}

2863

1500

2864

while(not quit_now){

2865

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

2866

&mc);

2867

if(quit_now or ret == 0){

2868

break;

2869

}

2870

if(debug){

2871

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

2872

(int)retry_interval);

2873

}

2874

sleep((unsigned int)retry_interval);

2875

}

2876

2877

if(not quit_now){

1501

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

1502

if(ret < 0){

1503

switch(errno){

1504

case ENETUNREACH:

1505

case EHOSTDOWN:

1506

case EHOSTUNREACH:

1507

exitcode = EX_NOHOST;

1508

break;

1509

case EINVAL:

1510

exitcode = EX_USAGE;

1511

break;

1512

case EIO:

1513

exitcode = EX_IOERR;

1514

break;

1515

case EPROTO:

1516

exitcode = EX_PROTOCOL;

1517

break;

1518

default:

1519

exitcode = EX_OSERR;

1520

break;

1521

}

1522

} else {

2878

1523

exitcode = EXIT_SUCCESS;

2879

1524

}

2880

2881

1525

goto end;

2882

1526

}

2883

1527

2895

1539

config.publish_domain = 0;

2896

1540

2897

1541

/* Allocate a new server */

2898

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2899

&config, NULL, NULL, &ret);

1542

mc.server = avahi_server_new(avahi_simple_poll_get

1543

(mc.simple_poll), &config, NULL,

1544

NULL, &error);

2900

1545

2901

1546

/* Free the Avahi configuration data */

2902

1547

avahi_server_config_free(&config);

2904

1549

2905

1550

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

2906

1551

if(mc.server == NULL){

2907

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

2908

avahi_strerror(ret));

1552

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

1553

avahi_strerror(error));

2909

1554

exitcode = EX_UNAVAILABLE;

2910

1555

goto end;

2911

1556

}

2917

1562

/* Create the Avahi service browser */

2918

1563

sb = avahi_s_service_browser_new(mc.server, if_index,

2919

1564

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2920

NULL, 0, browse_callback,

2921

(void *)&mc);

1565

NULL, 0, browse_callback, NULL);

2922

1566

if(sb == NULL){

2923

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

2924

avahi_strerror(avahi_server_errno(mc.server)));

1567

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

1568

avahi_strerror(avahi_server_errno(mc.server)));

2925

1569

exitcode = EX_UNAVAILABLE;

2926

1570

goto end;

2927

1571

}

2933

1577

/* Run the main loop */

2934

1578

2935

1579

if(debug){

2936

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

1580

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

2937

1581

}

2938

1582

2939

ret = avahi_loop_with_timeout(simple_poll,

2940

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

2941

if(debug){

2942

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

2943

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

2944

}

1583

avahi_simple_poll_loop(mc.simple_poll);

2945

1584

2946

1585

end:

2947

1586

2948

1587

if(debug){

2949

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

1588

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

2950

1589

}

2951

1590

2952

1591

/* Cleanup things */

2953

free(mc.interfaces);

2954

2955

1592

if(sb != NULL)

2956

1593

avahi_s_service_browser_free(sb);

2957

1594

2958

1595

if(mc.server != NULL)

2959

1596

avahi_server_free(mc.server);

2960

1597

2961

if(simple_poll != NULL)

2962

avahi_simple_poll_free(simple_poll);

1598

if(mc.simple_poll != NULL)

1599

avahi_simple_poll_free(mc.simple_poll);

2963

1600

2964

1601

if(gnutls_initialized){

2965

1602

gnutls_certificate_free_credentials(mc.cred);

1603

gnutls_global_deinit();

2966

1604

gnutls_dh_params_deinit(mc.dh_params);

2967

1605

}

2968

1606

2970

1608

gpgme_release(mc.ctx);

2971

1609

}

2972

1610

2973

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

2974

has seen */

2975

if(mc.current_server != NULL){

2976

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

2977

while(mc.current_server != NULL){

2978

server *next = mc.current_server->next;

2979

#ifdef __GNUC__

2980

#pragma GCC diagnostic push

2981

#pragma GCC diagnostic ignored "-Wcast-qual"

2982

#endif

2983

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

2984

#ifdef __GNUC__

2985

#pragma GCC diagnostic pop

2986

#endif

2987

free(mc.current_server);

2988

mc.current_server = next;

2989

}

2990

}

2991

2992

/* Re-raise privileges */

2993

{

2994

ret = raise_privileges();

2995

if(ret != 0){

2996

errno = ret;

2997

perror_plus("Failed to raise privileges");

2998

} else {

2999

3000

/* Run network hooks */

3001

run_network_hooks("stop", interfaces_hooks != NULL ?

3002

interfaces_hooks : "", delay);

3003

3004

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

3005

{

3006

char *interface = NULL;

3007

while((interface=argz_next(interfaces_to_take_down,

3008

interfaces_to_take_down_size,

3009

interface))){

3010

ret = take_down_interface(interface);

3011

if(ret != 0){

3012

errno = ret;

3013

perror_plus("Failed to take down interface");

3014

}

3015

}

3016

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

3017

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

3018

" down\n");

3019

}

3020

}

3021

}

3022

3023

ret = lower_privileges_permanently();

3024

if(ret != 0){

3025

errno = ret;

3026

perror_plus("Failed to lower privileges permanently");

3027

}

3028

}

3029

3030

free(interfaces_to_take_down);

3031

free(interfaces_hooks);

3032

3033

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

3034

uintmax_t level){

3035

struct dirent **direntries = NULL;

3036

int dret;

3037

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

3038

O_RDONLY

3039

| O_NOFOLLOW

3040

| O_DIRECTORY

3041

| O_PATH));

3042

if(dir_fd == -1){

3043

perror_plus("open");

3044

}

3045

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

3046

notdotentries, alphasort);

3047

if(numentries >= 0){

3048

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

3049

if(debug){

3050

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

3051

dirname, direntries[i]->d_name);

3052

}

3053

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

3054

if(dret == -1){

3055

if(errno == EISDIR){

3056

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

3057

AT_REMOVEDIR);

3058

}

3059

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

3060

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

3061

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

3062

/* Recurse only in this special case */

3063

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

3064

dret = 0;

3065

}

3066

if(dret == -1){

3067

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

3068

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

3069

}

3070

}

3071

free(direntries[i]);

3072

}

3073

3074

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

3075

free(direntries);

3076

if(numentries == -1){

3077

perror_plus("scandirat");

3078

}

3079

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3080

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

3081

perror_plus("rmdir");

3082

}

3083

} else {

3084

perror_plus("scandirat");

3085

}

3086

close(dir_fd);

3087

}

3088

3089

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

3090

if(tempdir != NULL){

3091

clean_dir_at(-1, tempdir, 0);

1611

/* Take down the network interface */

1612

if(take_down_interface){

1613

/* Re-raise priviliges */

1614

errno = 0;

1615

ret = seteuid(0);

1616

if(ret == -1){

1617

perror("seteuid");

1618

}

1619

if(geteuid() == 0){

1620

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

1621

if(ret == -1){

1622

perror("ioctl SIOCGIFFLAGS");

1623

} else if(network.ifr_flags & IFF_UP) {

1624

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

1625

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

1626

if(ret == -1){

1627

perror("ioctl SIOCSIFFLAGS");

1628

}

1629

}

1630

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

1631

if(ret == -1){

1632

perror("close");

1633

}

1634

/* Lower privileges permanently */

1635

errno = 0;

1636

ret = setuid(uid);

1637

if(ret == -1){

1638

perror("setuid");

1639

}

1640

}

1641

}

1642

1643

/* Removes the temp directory used by GPGME */

1644

if(tempdir_created){

1645

DIR *d;

1646

struct dirent *direntry;

1647

d = opendir(tempdir);

1648

if(d == NULL){

1649

if(errno != ENOENT){

1650

perror("opendir");

1651

}

1652

} else {

1653

while(true){

1654

direntry = readdir(d);

1655

if(direntry == NULL){

1656

break;

1657

}

1658

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

1659

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

1660

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

1661

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

1662

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

1663

continue;

1664

}

1665

char *fullname = NULL;

1666

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

1667

direntry->d_name);

1668

if(ret < 0){

1669

perror("asprintf");

1670

continue;

1671

}

1672

ret = remove(fullname);

1673

if(ret == -1){

1674

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

1675

strerror(errno));

1676

}

1677

free(fullname);

1678

}

1679

closedir(d);

1680

}

1681

ret = rmdir(tempdir);

1682

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

1683

perror("rmdir");

1684

}

3092

1685

}

3093

1686

3094

1687

if(quit_now){

3098

1691

&old_sigterm_action,

3099

1692

NULL));

3100

1693

if(ret == -1){

3101

perror_plus("sigaction");

1694

perror("sigaction");

3102

1695

}

3103

1696

do {

3104

1697

ret = raise(signal_received);

3105

1698

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

3106

1699

if(ret != 0){

3107

perror_plus("raise");

1700

perror("raise");

3108

1701

abort();

3109

1702

}

3110

1703

TEMP_FAILURE_RETRY(pause());