/mandos/release : revision 237.7.38

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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() */

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

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

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program_invocation_short_name */

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

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*/

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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, inet_ntop() */

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

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

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argp_state, struct argp,

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

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init_gnutls_session(),

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

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#define SECKEY "seckey.txt"

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#define PUBKEY "pubkey.txt"

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

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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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const char *argp_program_bug_address = "<mandos@fukt.bsnet.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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uint16_t port;

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AvahiIfIndex if_index;

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int af;

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struct timespec last_seen;

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/* 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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unsigned int dh_bits;

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const char *priority;

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gpgme_ctx_t ctx;

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server *current_server;

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char *interfaces;

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size_t interfaces_size;

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} mandos_context;

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/* global so signal handler can reach it*/

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AvahiSimplePoll *simple_poll;

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

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

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.dh_bits = 1024, .priority = "SECURE256"

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

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.current_server = NULL };

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sig_atomic_t quit_now = 0;

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164

int signal_received = 0;

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/* Function to use when printing errors */

180

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void perror_plus(const char *print_text){

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int e = errno;

182

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

183

169

program_invocation_short_name);

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errno = e;

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170

perror(print_text);

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}

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

189

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

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va_list ap;

191

va_start (ap, format);

192

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

194

program_invocation_short_name));

195

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

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}

197

198

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/*

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

200

175

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

201

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* "buffer_length" is how much is already used.

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177

*/

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__attribute__((nonnull, warn_unused_result))

204

178

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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180

if(buffer_length + BUFFER_SIZE > buffer_capacity){

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

208

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;

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*buffer = NULL;

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

182

if(buffer == NULL){

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183

return 0;

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184

}

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*buffer = new_buf;

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buffer_capacity += BUFFER_SIZE;

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186

}

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return buffer_capacity;

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}

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

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__attribute__((nonnull, warn_unused_result))

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

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int af, server **current_server){

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int add_server(const char *ip, uint16_t port,

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AvahiIfIndex if_index,

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int af){

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193

int ret;

226

194

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

227

195

if(new_server == NULL){

228

196

perror_plus("malloc");

229

return false;

197

return -1;

230

198

}

231

199

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

232

.port = port,

233

.if_index = if_index,

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.af = af };

200

.port = port,

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.if_index = if_index,

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.af = af };

235

203

if(new_server->ip == NULL){

236

204

perror_plus("strdup");

237

free(new_server);

238

return false;

239

}

240

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

241

if(ret == -1){

242

perror_plus("clock_gettime");

243

#ifdef __GNUC__

244

#pragma GCC diagnostic push

245

#pragma GCC diagnostic ignored "-Wcast-qual"

246

#endif

247

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

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#ifdef __GNUC__

249

#pragma GCC diagnostic pop

250

#endif

251

free(new_server);

252

return false;

253

}

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/* Special case of first server */

255

if(*current_server == NULL){

205

return -1;

206

}

207

/* unique case of first server */

208

if (mc.current_server == NULL){

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209

new_server->next = new_server;

257

210

new_server->prev = new_server;

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*current_server = new_server;

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mc.current_server = new_server;

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

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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->next = mc.current_server;

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

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new_server->prev->next = new_server;

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(*current_server)->prev = new_server;

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}

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return true;

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mc.current_server->prev = new_server;

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}

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

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if(ret == -1){

221

perror_plus("clock_gettime");

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return -1;

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}

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return 0;

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}

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/*

270

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* Initialize GPGME.

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229

*/

272

__attribute__((nonnull, warn_unused_result))

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static bool init_gpgme(const char * const seckey,

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const char * const pubkey,

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const char * const tempdir,

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mandos_context *mc){

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static bool init_gpgme(const char *seckey,

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const char *pubkey, const char *tempdir){

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gpgme_error_t rc;

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gpgme_engine_info_t engine_info;

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/*

281

237

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

282

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*/

283

bool import_key(const char * const filename){

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bool import_key(const char *filename){

284

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int ret;

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241

int fd;

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242

gpgme_data_t pgp_data;

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

295

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if(rc != GPG_ERR_NO_ERROR){

296

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

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gpgme_strsource(rc), gpgme_strerror(rc));

252

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

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gpgme_strsource(rc), gpgme_strerror(rc));

298

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return false;

299

255

}

300

256

301

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

257

rc = gpgme_op_import(mc.ctx, pgp_data);

302

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if(rc != GPG_ERR_NO_ERROR){

303

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

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gpgme_strsource(rc), gpgme_strerror(rc));

259

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

260

gpgme_strsource(rc), gpgme_strerror(rc));

305

261

return false;

306

262

}

307

263

308

ret = close(fd);

264

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

309

265

if(ret == -1){

310

266

perror_plus("close");

311

267

}

314

270

}

315

271

316

272

if(debug){

317

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

273

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

318

274

}

319

275

320

276

/* Init GPGME */

321

277

gpgme_check_version(NULL);

322

278

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

323

279

if(rc != GPG_ERR_NO_ERROR){

324

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

325

gpgme_strsource(rc), gpgme_strerror(rc));

280

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

281

gpgme_strsource(rc), gpgme_strerror(rc));

326

282

return false;

327

283

}

328

284

329

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

285

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

330

286

rc = gpgme_get_engine_info(&engine_info);

331

287

if(rc != GPG_ERR_NO_ERROR){

332

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

333

gpgme_strsource(rc), gpgme_strerror(rc));

288

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

289

gpgme_strsource(rc), gpgme_strerror(rc));

334

290

return false;

335

291

}

336

292

while(engine_info != NULL){

342

298

engine_info = engine_info->next;

343

299

}

344

300

if(engine_info == NULL){

345

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

346

tempdir);

301

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

347

302

return false;

348

303

}

349

304

350

305

/* Create new GPGME "context" */

351

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

306

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

352

307

if(rc != GPG_ERR_NO_ERROR){

353

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

354

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

355

gpgme_strerror(rc));

308

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

309

gpgme_strsource(rc), gpgme_strerror(rc));

356

310

return false;

357

311

}

358

312

367

321

* Decrypt OpenPGP data.

368

322

* Returns -1 on error

369

323

*/

370

__attribute__((nonnull, warn_unused_result))

371

324

static ssize_t pgp_packet_decrypt(const char *cryptotext,

372

325

size_t crypto_size,

373

char **plaintext,

374

mandos_context *mc){

326

char **plaintext){

375

327

gpgme_data_t dh_crypto, dh_plain;

376

328

gpgme_error_t rc;

377

329

ssize_t ret;

379

331

ssize_t plaintext_length = 0;

380

332

381

333

if(debug){

382

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

334

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

383

335

}

384

336

385

337

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

386

338

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

387

339

0);

388

340

if(rc != GPG_ERR_NO_ERROR){

389

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

390

gpgme_strsource(rc), gpgme_strerror(rc));

341

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

342

gpgme_strsource(rc), gpgme_strerror(rc));

391

343

return -1;

392

344

}

393

345

394

346

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

395

347

rc = gpgme_data_new(&dh_plain);

396

348

if(rc != GPG_ERR_NO_ERROR){

397

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

398

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

399

gpgme_strsource(rc), gpgme_strerror(rc));

349

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

350

gpgme_strsource(rc), gpgme_strerror(rc));

400

351

gpgme_data_release(dh_crypto);

401

352

return -1;

402

353

}

403

354

404

355

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

405

356

data buffer */

406

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

357

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

407

358

if(rc != GPG_ERR_NO_ERROR){

408

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

409

gpgme_strsource(rc), gpgme_strerror(rc));

359

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

360

gpgme_strsource(rc), gpgme_strerror(rc));

410

361

plaintext_length = -1;

411

362

if(debug){

412

363

gpgme_decrypt_result_t result;

413

result = gpgme_op_decrypt_result(mc->ctx);

364

result = gpgme_op_decrypt_result(mc.ctx);

414

365

if(result == NULL){

415

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

366

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

416

367

} else {

417

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

418

result->unsupported_algorithm);

419

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

420

result->wrong_key_usage);

368

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

369

result->unsupported_algorithm);

370

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

371

result->wrong_key_usage);

421

372

if(result->file_name != NULL){

422

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

373

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

423

374

}

424

375

gpgme_recipient_t recipient;

425

376

recipient = result->recipients;

426

377

while(recipient != NULL){

427

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

428

gpgme_pubkey_algo_name

429

(recipient->pubkey_algo));

430

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

431

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

432

recipient->status == GPG_ERR_NO_SECKEY

433

? "No" : "Yes");

378

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

379

gpgme_pubkey_algo_name(recipient->pubkey_algo));

380

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

381

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

382

recipient->status == GPG_ERR_NO_SECKEY

383

? "No" : "Yes");

434

384

recipient = recipient->next;

435

385

}

436

386

}

439

389

}

440

390

441

391

if(debug){

442

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

392

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

443

393

}

444

394

445

395

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

452

402

*plaintext = NULL;

453

403

while(true){

454

404

plaintext_capacity = incbuffer(plaintext,

455

(size_t)plaintext_length,

456

plaintext_capacity);

405

(size_t)plaintext_length,

406

plaintext_capacity);

457

407

if(plaintext_capacity == 0){

458

perror_plus("incbuffer");

459

plaintext_length = -1;

460

goto decrypt_end;

408

perror_plus("incbuffer");

409

plaintext_length = -1;

410

goto decrypt_end;

461

411

}

462

412

463

413

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

476

426

}

477

427

478

428

if(debug){

479

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

429

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

480

430

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

481

431

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

482

432

}

493

443

return plaintext_length;

494

444

}

495

445

496

__attribute__((warn_unused_result, const))

497

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

498

if(str == NULL)

499

return "(unknown)";

500

return str;

501

}

502

503

__attribute__((warn_unused_result))

504

static const char *safer_gnutls_strerror(int value){

505

const char *ret = gnutls_strerror(value);

506

return safe_string(ret);

446

static const char * safer_gnutls_strerror(int value){

447

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

448

-Wunreachable-code */

449

if(ret == NULL)

450

ret = "(unknown)";

451

return ret;

507

452

}

508

453

509

454

/* GnuTLS log function callback */

510

__attribute__((nonnull))

511

455

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

512

456

const char* string){

513

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

457

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

514

458

}

515

459

516

__attribute__((nonnull, warn_unused_result))

517

460

static int init_gnutls_global(const char *pubkeyfilename,

518

const char *seckeyfilename,

519

const char *dhparamsfilename,

520

mandos_context *mc){

461

const char *seckeyfilename){

521

462

int ret;

522

unsigned int uret;

523

463

524

464

if(debug){

525

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

465

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

526

466

}

527

467

528

468

ret = gnutls_global_init();

529

469

if(ret != GNUTLS_E_SUCCESS){

530

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

531

safer_gnutls_strerror(ret));

470

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

471

safer_gnutls_strerror(ret));

532

472

return -1;

533

473

}

534

474

541

481

}

542

482

543

483

/* OpenPGP credentials */

544

ret = gnutls_certificate_allocate_credentials(&mc->cred);

484

ret = gnutls_certificate_allocate_credentials(&mc.cred);

545

485

if(ret != GNUTLS_E_SUCCESS){

546

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

547

safer_gnutls_strerror(ret));

486

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

487

safer_gnutls_strerror(ret));

548

488

gnutls_global_deinit();

549

489

return -1;

550

490

}

551

491

552

492

if(debug){

553

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

554

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

555

pubkeyfilename,

556

seckeyfilename);

493

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

494

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

495

seckeyfilename);

557

496

}

558

497

559

498

ret = gnutls_certificate_set_openpgp_key_file

560

(mc->cred, pubkeyfilename, seckeyfilename,

499

(mc.cred, pubkeyfilename, seckeyfilename,

561

500

GNUTLS_OPENPGP_FMT_BASE64);

562

501

if(ret != GNUTLS_E_SUCCESS){

563

fprintf_plus(stderr,

564

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

565

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

566

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

567

safer_gnutls_strerror(ret));

502

fprintf(stderr,

503

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

504

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

505

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

506

safer_gnutls_strerror(ret));

568

507

goto globalfail;

569

508

}

570

509

571

510

/* GnuTLS server initialization */

572

ret = gnutls_dh_params_init(&mc->dh_params);

573

if(ret != GNUTLS_E_SUCCESS){

574

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

575

" initialization: %s\n",

576

safer_gnutls_strerror(ret));

577

goto globalfail;

578

}

579

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

580

if(dhparamsfilename != NULL){

581

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

582

do {

583

int dhpfile = open(dhparamsfilename, O_RDONLY);

584

if(dhpfile == -1){

585

perror_plus("open");

586

dhparamsfilename = NULL;

587

break;

588

}

589

size_t params_capacity = 0;

590

while(true){

591

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

592

(size_t)params.size,

593

(size_t)params_capacity);

594

if(params_capacity == 0){

595

perror_plus("incbuffer");

596

free(params.data);

597

params.data = NULL;

598

dhparamsfilename = NULL;

599

break;

600

}

601

ssize_t bytes_read = read(dhpfile,

602

params.data + params.size,

603

BUFFER_SIZE);

604

/* EOF */

605

if(bytes_read == 0){

606

break;

607

}

608

/* check bytes_read for failure */

609

if(bytes_read < 0){

610

perror_plus("read");

611

free(params.data);

612

params.data = NULL;

613

dhparamsfilename = NULL;

614

break;

615

}

616

params.size += (unsigned int)bytes_read;

617

}

618

if(params.data == NULL){

619

dhparamsfilename = NULL;

620

}

621

if(dhparamsfilename == NULL){

622

break;

623

}

624

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

625

GNUTLS_X509_FMT_PEM);

626

if(ret != GNUTLS_E_SUCCESS){

627

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

628

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

629

safer_gnutls_strerror(ret));

630

dhparamsfilename = NULL;

631

}

632

} while(false);

633

}

634

if(dhparamsfilename == NULL){

635

if(mc->dh_bits == 0){

636

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

637

/* Try to read the private key file */

638

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

639

do {

640

int secfile = open(seckeyfilename, O_RDONLY);

641

if(secfile == -1){

642

perror_plus("open");

643

break;

644

}

645

size_t buffer_capacity = 0;

646

while(true){

647

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

648

(size_t)buffer.size,

649

(size_t)buffer_capacity);

650

if(buffer_capacity == 0){

651

perror_plus("incbuffer");

652

free(buffer.data);

653

buffer.data = NULL;

654

break;

655

}

656

ssize_t bytes_read = read(secfile,

657

buffer.data + buffer.size,

658

BUFFER_SIZE);

659

/* EOF */

660

if(bytes_read == 0){

661

break;

662

}

663

/* check bytes_read for failure */

664

if(bytes_read < 0){

665

perror_plus("read");

666

free(buffer.data);

667

buffer.data = NULL;

668

break;

669

}

670

buffer.size += (unsigned int)bytes_read;

671

}

672

close(secfile);

673

} while(false);

674

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

675

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

676

if(buffer.data != NULL){

677

{

678

gnutls_openpgp_privkey_t privkey = NULL;

679

ret = gnutls_openpgp_privkey_init(&privkey);

680

if(ret != GNUTLS_E_SUCCESS){

681

fprintf_plus(stderr, "Error initializing OpenPGP key"

682

" structure: %s",

683

safer_gnutls_strerror(ret));

684

free(buffer.data);

685

buffer.data = NULL;

686

} else {

687

ret = gnutls_openpgp_privkey_import

688

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

689

if(ret != GNUTLS_E_SUCCESS){

690

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

691

safer_gnutls_strerror(ret));

692

privkey = NULL;

693

}

694

free(buffer.data);

695

buffer.data = NULL;

696

if(privkey != NULL){

697

/* Use private key to suggest an appropriate

698

sec_param */

699

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

700

gnutls_openpgp_privkey_deinit(privkey);

701

if(debug){

702

fprintf_plus(stderr, "This OpenPGP key implies using"

703

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

704

safe_string(gnutls_sec_param_get_name

705

(sec_param)));

706

}

707

}

708

}

709

}

710

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

711

/* Err on the side of caution */

712

sec_param = GNUTLS_SEC_PARAM_ULTRA;

713

if(debug){

714

fprintf_plus(stderr, "Falling back to security parameter"

715

" \"%s\"\n",

716

safe_string(gnutls_sec_param_get_name

717

(sec_param)));

718

}

719

}

720

}

721

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

722

if(uret != 0){

723

mc->dh_bits = uret;

724

if(debug){

725

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

726

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

727

safe_string(gnutls_sec_param_get_name

728

(sec_param)),

729

mc->dh_bits);

730

}

731

} else {

732

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

733

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

734

safe_string(gnutls_sec_param_get_name

735

(sec_param)),

736

safer_gnutls_strerror(ret));

737

goto globalfail;

738

}

739

} else if(debug){

740

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

741

mc->dh_bits);

742

}

743

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

744

if(ret != GNUTLS_E_SUCCESS){

745

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

746

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

747

safer_gnutls_strerror(ret));

748

goto globalfail;

749

}

750

}

751

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

511

ret = gnutls_dh_params_init(&mc.dh_params);

512

if(ret != GNUTLS_E_SUCCESS){

513

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

514

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

515

goto globalfail;

516

}

517

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

518

if(ret != GNUTLS_E_SUCCESS){

519

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

520

safer_gnutls_strerror(ret));

521

goto globalfail;

522

}

523

524

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

752

525

753

526

return 0;

754

527

755

528

globalfail:

756

529

757

gnutls_certificate_free_credentials(mc->cred);

530

gnutls_certificate_free_credentials(mc.cred);

758

531

gnutls_global_deinit();

759

gnutls_dh_params_deinit(mc->dh_params);

532

gnutls_dh_params_deinit(mc.dh_params);

760

533

return -1;

761

534

}

762

535

763

__attribute__((nonnull, warn_unused_result))

764

static int init_gnutls_session(gnutls_session_t *session,

765

mandos_context *mc){

536

static int init_gnutls_session(gnutls_session_t *session){

766

537

int ret;

767

538

/* GnuTLS session creation */

768

539

do {

772

543

}

773

544

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

774

545

if(ret != GNUTLS_E_SUCCESS){

775

fprintf_plus(stderr,

776

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

777

safer_gnutls_strerror(ret));

546

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

547

safer_gnutls_strerror(ret));

778

548

}

779

549

780

550

{

781

551

const char *err;

782

552

do {

783

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

553

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

784

554

if(quit_now){

785

555

gnutls_deinit(*session);

786

556

return -1;

787

557

}

788

558

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

789

559

if(ret != GNUTLS_E_SUCCESS){

790

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

791

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

792

safer_gnutls_strerror(ret));

560

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

561

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

562

safer_gnutls_strerror(ret));

793

563

gnutls_deinit(*session);

794

564

return -1;

795

565

}

797

567

798

568

do {

799

569

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

800

mc->cred);

570

mc.cred);

801

571

if(quit_now){

802

572

gnutls_deinit(*session);

803

573

return -1;

804

574

}

805

575

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

806

576

if(ret != GNUTLS_E_SUCCESS){

807

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

808

safer_gnutls_strerror(ret));

577

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

578

safer_gnutls_strerror(ret));

809

579

gnutls_deinit(*session);

810

580

return -1;

811

581

}

813

583

/* ignore client certificate if any. */

814

584

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

815

585

586

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

587

816

588

return 0;

817

589

}

818

590

820

592

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

821

593

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

822

594

823

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

824

__attribute__((warn_unused_result))

825

error_t raise_privileges(void){

826

error_t old_errno = errno;

827

error_t ret_errno = 0;

828

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

829

ret_errno = errno;

830

}

831

errno = old_errno;

832

return ret_errno;

833

}

834

835

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

836

__attribute__((warn_unused_result))

837

error_t raise_privileges_permanently(void){

838

error_t old_errno = errno;

839

error_t ret_errno = raise_privileges();

840

if(ret_errno != 0){

841

errno = old_errno;

842

return ret_errno;

843

}

844

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

845

ret_errno = errno;

846

}

847

errno = old_errno;

848

return ret_errno;

849

}

850

851

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

852

__attribute__((warn_unused_result))

853

error_t lower_privileges(void){

854

error_t old_errno = errno;

855

error_t ret_errno = 0;

856

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

857

ret_errno = errno;

858

}

859

errno = old_errno;

860

return ret_errno;

861

}

862

863

/* Lower privileges permanently */

864

__attribute__((warn_unused_result))

865

error_t lower_privileges_permanently(void){

866

error_t old_errno = errno;

867

error_t ret_errno = 0;

868

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

869

ret_errno = errno;

870

}

871

errno = old_errno;

872

return ret_errno;

873

}

874

875

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

876

__attribute__((nonnull, warn_unused_result))

877

static bool add_delete_local_route(const bool add,

878

const char *address,

879

AvahiIfIndex if_index){

880

int ret;

881

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

882

char add_arg[] = "add";

883

char delete_arg[] = "delete";

884

char debug_flag[] = "--debug";

885

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

886

if(pluginhelperdir == NULL){

887

if(debug){

888

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

889

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

890

}

891

return false;

892

}

893

894

char interface[IF_NAMESIZE];

895

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

896

perror_plus("if_indextoname");

897

return false;

898

}

899

900

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

901

if(devnull == -1){

902

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

903

return false;

904

}

905

pid_t pid = fork();

906

if(pid == 0){

907

/* Child */

908

/* Raise privileges */

909

errno = raise_privileges_permanently();

910

if(errno != 0){

911

perror_plus("Failed to raise privileges");

912

/* _exit(EX_NOPERM); */

913

} else {

914

/* Set group */

915

errno = 0;

916

ret = setgid(0);

917

if(ret == -1){

918

perror_plus("setgid");

919

_exit(EX_NOPERM);

920

}

921

/* Reset supplementary groups */

922

errno = 0;

923

ret = setgroups(0, NULL);

924

if(ret == -1){

925

perror_plus("setgroups");

926

_exit(EX_NOPERM);

927

}

928

}

929

ret = dup2(devnull, STDIN_FILENO);

930

if(ret == -1){

931

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

932

_exit(EX_OSERR);

933

}

934

ret = close(devnull);

935

if(ret == -1){

936

perror_plus("close");

937

_exit(EX_OSERR);

938

}

939

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

940

if(ret == -1){

941

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

942

_exit(EX_OSERR);

943

}

944

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

945

O_RDONLY

946

| O_DIRECTORY

947

| O_PATH

948

| O_CLOEXEC));

949

if(helperdir_fd == -1){

950

perror_plus("open");

951

_exit(EX_UNAVAILABLE);

952

}

953

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

954

helper, O_RDONLY));

955

if(helper_fd == -1){

956

perror_plus("openat");

957

close(helperdir_fd);

958

_exit(EX_UNAVAILABLE);

959

}

960

close(helperdir_fd);

961

#ifdef __GNUC__

962

#pragma GCC diagnostic push

963

#pragma GCC diagnostic ignored "-Wcast-qual"

964

#endif

965

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

966

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

967

interface, debug ? debug_flag : NULL, NULL },

968

environ) == -1){

969

#ifdef __GNUC__

970

#pragma GCC diagnostic pop

971

#endif

972

perror_plus("fexecve");

973

_exit(EXIT_FAILURE);

974

}

975

}

976

if(pid == -1){

977

perror_plus("fork");

978

return false;

979

}

980

int status;

981

pid_t pret = -1;

982

errno = 0;

983

do {

984

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

985

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

986

int errno_raising = 0;

987

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

988

errno_raising = errno;

989

perror_plus("Failed to raise privileges in order to"

990

" kill helper program");

991

}

992

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

993

perror_plus("kill");

994

}

995

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

996

perror_plus("Failed to lower privileges after killing"

997

" helper program");

998

}

999

return false;

1000

}

1001

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

1002

if(pret == -1){

1003

perror_plus("waitpid");

1004

return false;

1005

}

1006

if(WIFEXITED(status)){

1007

if(WEXITSTATUS(status) != 0){

1008

fprintf_plus(stderr, "Error: iprouteadddel exited"

1009

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

1010

return false;

1011

}

1012

return true;

1013

}

1014

if(WIFSIGNALED(status)){

1015

fprintf_plus(stderr, "Error: iprouteadddel died by"

1016

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

1017

return false;

1018

}

1019

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

1020

return false;

1021

}

1022

1023

__attribute__((nonnull, warn_unused_result))

1024

static bool add_local_route(const char *address,

1025

AvahiIfIndex if_index){

1026

if(debug){

1027

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

1028

}

1029

return add_delete_local_route(true, address, if_index);

1030

}

1031

1032

__attribute__((nonnull, warn_unused_result))

1033

static bool delete_local_route(const char *address,

1034

AvahiIfIndex if_index){

1035

if(debug){

1036

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

1037

}

1038

return add_delete_local_route(false, address, if_index);

1039

}

1040

1041

595

/* Called when a Mandos server is found */

1042

__attribute__((nonnull, warn_unused_result))

1043

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

596

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

1044

597

AvahiIfIndex if_index,

1045

int af, mandos_context *mc){

598

int af){

1046

599

int ret, tcp_sd = -1;

1047

600

ssize_t sret;

1048

struct sockaddr_storage to;

601

union {

602

struct sockaddr_in in;

603

struct sockaddr_in6 in6;

604

} to;

1049

605

char *buffer = NULL;

1050

606

char *decrypted_buffer = NULL;

1051

607

size_t buffer_length = 0;

1054

610

int retval = -1;

1055

611

gnutls_session_t session;

1056

612

int pf; /* Protocol family */

1057

bool route_added = false;

1058

613

1059

614

errno = 0;

1060

615

1071

626

pf = PF_INET;

1072

627

break;

1073

628

default:

1074

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

629

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

1075

630

errno = EINVAL;

1076

631

return -1;

1077

632

}

1078

633

1079

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

1080

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

1081

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

1082

bool match = false;

1083

{

1084

char *interface = NULL;

1085

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

1086

interface))){

1087

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

1088

match = true;

1089

break;

1090

}

1091

}

1092

}

1093

if(not match){

1094

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

1095

connect to the server */

1096

if(debug){

1097

char interface[IF_NAMESIZE];

1098

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

1099

perror_plus("if_indextoname");

1100

} else {

1101

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

1102

" \"%s\"\n",

1103

if_indextoname((unsigned int)if_index,

1104

interface));

1105

}

1106

}

1107

return -1;

1108

}

1109

}

1110

1111

ret = init_gnutls_session(&session, mc);

634

ret = init_gnutls_session(&session);

1112

635

if(ret != 0){

1113

636

return -1;

1114

637

}

1115

638

1116

639

if(debug){

1117

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

1118

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

640

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

641

"\n", ip, port);

1119

642

}

1120

643

1121

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

644

tcp_sd = socket(pf, SOCK_STREAM, 0);

1122

645

if(tcp_sd < 0){

1123

646

int e = errno;

1124

647

perror_plus("socket");

1131

654

goto mandos_end;

1132

655

}

1133

656

657

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

1134

658

if(af == AF_INET6){

1135

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

1136

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

1137

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

659

to.in6.sin6_family = (sa_family_t)af;

660

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

1138

661

} else { /* IPv4 */

1139

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

1140

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

1141

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

662

to.in.sin_family = (sa_family_t)af;

663

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

1142

664

}

1143

665

if(ret < 0 ){

1144

666

int e = errno;

1148

670

}

1149

671

if(ret == 0){

1150

672

int e = errno;

1151

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

673

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

1152

674

errno = e;

1153

675

goto mandos_end;

1154

676

}

1155

677

if(af == AF_INET6){

1156

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

1157

if(IN6_IS_ADDR_LINKLOCAL

1158

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

678

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

679

-Wconversion and

680

-Wunreachable-code */

681

682

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

683

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

684

-Wunreachable-code*/

1159

685

if(if_index == AVAHI_IF_UNSPEC){

1160

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

1161

" incomplete without a network interface\n");

686

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

687

" without a network interface\n");

1162

688

errno = EINVAL;

1163

689

goto mandos_end;

1164

690

}

1165

691

/* Set the network interface number as scope */

1166

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

692

to.in6.sin6_scope_id = (uint32_t)if_index;

1167

693

}

1168

694

} else {

1169

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

695

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

696

-Wconversion and

697

-Wunreachable-code */

1170

698

}

1171

699

1172

700

if(quit_now){

1180

708

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

1181

709

perror_plus("if_indextoname");

1182

710

} else {

1183

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

1184

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

711

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

712

ip, interface, port);

1185

713

}

1186

714

} else {

1187

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

1188

ip, (uintmax_t)port);

715

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

716

port);

1189

717

}

1190

718

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

1191

719

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

1192

if(af == AF_INET6){

1193

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

1194

sizeof(struct sockaddr_in6),

1195

addrstr, sizeof(addrstr), NULL, 0,

1196

NI_NUMERICHOST);

1197

} else {

1198

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

1199

sizeof(struct sockaddr_in),

1200

addrstr, sizeof(addrstr), NULL, 0,

1201

NI_NUMERICHOST);

1202

}

1203

if(ret == EAI_SYSTEM){

1204

perror_plus("getnameinfo");

1205

} else if(ret != 0) {

1206

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

1207

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

1208

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

1209

}

1210

}

1211

1212

if(quit_now){

1213

errno = EINTR;

1214

goto mandos_end;

1215

}

1216

1217

while(true){

1218

if(af == AF_INET6){

1219

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

1220

sizeof(struct sockaddr_in6));

1221

} else {

1222

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

1223

sizeof(struct sockaddr_in));

1224

}

1225

if(ret < 0){

1226

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

1227

and if_index != AVAHI_IF_UNSPEC

1228

and connect_to == NULL

1229

and not route_added and

1230

((af == AF_INET6 and not

1231

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1232

&to)->sin6_addr)))

1233

or (af == AF_INET and

1234

/* Not a a IPv4LL address */

1235

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

1236

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

1237

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

1238

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

1239

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

1240

connect to a Mandos server announced by Avahi on a server

1241

host with a global address. Work around this by retrying

1242

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

1243

1244

Avahi bug reference:

1245

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

1246

https://bugs.debian.org/587961

1247

*/

1248

if(debug){

1249

fprintf_plus(stderr, "Mandos server unreachable, trying"

1250

" direct route\n");

1251

}

1252

int e = errno;

1253

route_added = add_local_route(ip, if_index);

1254

if(route_added){

1255

continue;

1256

}

1257

errno = e;

1258

}

1259

if(errno != ECONNREFUSED or debug){

1260

int e = errno;

1261

perror_plus("connect");

1262

errno = e;

1263

}

1264

goto mandos_end;

1265

}

1266

1267

if(quit_now){

1268

errno = EINTR;

1269

goto mandos_end;

1270

}

1271

break;

720

const char *pcret;

721

if(af == AF_INET6){

722

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

723

sizeof(addrstr));

724

} else {

725

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

726

sizeof(addrstr));

727

}

728

if(pcret == NULL){

729

perror_plus("inet_ntop");

730

} else {

731

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

732

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

733

}

734

}

735

}

736

737

if(quit_now){

738

errno = EINTR;

739

goto mandos_end;

740

}

741

742

if(af == AF_INET6){

743

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

744

} else {

745

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

746

}

747

if(ret < 0){

748

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

749

int e = errno;

750

perror_plus("connect");

751

errno = e;

752

}

753

goto mandos_end;

754

}

755

756

if(quit_now){

757

errno = EINTR;

758

goto mandos_end;

1272

759

}

1273

760

1274

761

const char *out = mandos_protocol_version;

1276

763

while(true){

1277

764

size_t out_size = strlen(out);

1278

765

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

1279

out_size - written));

766

out_size - written));

1280

767

if(ret == -1){

1281

768

int e = errno;

1282

769

perror_plus("write");

1302

789

}

1303

790

1304

791

if(debug){

1305

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

792

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

1306

793

}

1307

794

1308

795

if(quit_now){

1310

797

goto mandos_end;

1311

798

}

1312

799

1313

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

1314

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

1315

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

1316

gnutls_transport_set_ptr(session,

1317

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

800

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

801

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

1318

802

1319

803

if(quit_now){

1320

804

errno = EINTR;

1331

815

1332

816

if(ret != GNUTLS_E_SUCCESS){

1333

817

if(debug){

1334

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

818

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

1335

819

gnutls_perror(ret);

1336

820

}

1337

821

errno = EPROTO;

1341

825

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

1342

826

1343

827

if(debug){

1344

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

1345

" %s\n", ip);

828

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

829

ip);

1346

830

}

1347

831

1348

832

while(true){

1353

837

}

1354

838

1355

839

buffer_capacity = incbuffer(&buffer, buffer_length,

1356

buffer_capacity);

840

buffer_capacity);

1357

841

if(buffer_capacity == 0){

1358

842

int e = errno;

1359

843

perror_plus("incbuffer");

1386

870

}

1387

871

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

1388

872

if(ret < 0){

1389

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

1390

"***\n");

873

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

1391

874

gnutls_perror(ret);

1392

875

errno = EPROTO;

1393

876

goto mandos_end;

1394

877

}

1395

878

break;

1396

879

default:

1397

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

1398

" encrypted session with Mandos server\n");

880

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

881

" encrypted session with Mandos server\n");

1399

882

gnutls_bye(session, GNUTLS_SHUT_RDWR);

1400

883

errno = EIO;

1401

884

goto mandos_end;

1406

889

}

1407

890

1408

891

if(debug){

1409

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

892

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

1410

893

}

1411

894

1412

895

if(quit_now){

1424

907

1425

908

if(buffer_length > 0){

1426

909

ssize_t decrypted_buffer_size;

1427

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

1428

&decrypted_buffer, mc);

910

decrypted_buffer_size = pgp_packet_decrypt(buffer,

911

buffer_length,

912

&decrypted_buffer);

1429

913

if(decrypted_buffer_size >= 0){

1430

914

1431

915

written = 0;

1441

925

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

1442

926

int e = errno;

1443

927

if(debug){

1444

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

1445

strerror(errno));

928

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

929

strerror(errno));

1446

930

}

1447

931

errno = e;

1448

932

goto mandos_end;

1457

941

1458

942

mandos_end:

1459

943

{

1460

if(route_added){

1461

if(not delete_local_route(ip, if_index)){

1462

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

1463

" interface %d", ip, if_index);

1464

}

1465

}

1466

944

int e = errno;

1467

945

free(decrypted_buffer);

1468

946

free(buffer);

1469

947

if(tcp_sd >= 0){

1470

ret = close(tcp_sd);

948

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

1471

949

}

1472

950

if(ret == -1){

1473

951

if(e == 0){

1485

963

return retval;

1486

964

}

1487

965

1488

__attribute__((nonnull))

1489

966

static void resolve_callback(AvahiSServiceResolver *r,

1490

967

AvahiIfIndex interface,

1491

968

AvahiProtocol proto,

1499

976

AVAHI_GCC_UNUSED AvahiStringList *txt,

1500

977

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1501

978

flags,

1502

void *mc){

1503

if(r == NULL){

1504

return;

1505

}

979

AVAHI_GCC_UNUSED void* userdata){

980

assert(r);

1506

981

1507

982

/* Called whenever a service has been resolved successfully or

1508

983

timed out */

1509

984

1510

985

if(quit_now){

1511

avahi_s_service_resolver_free(r);

1512

986

return;

1513

987

}

1514

988

1515

989

switch(event){

1516

990

default:

1517

991

case AVAHI_RESOLVER_FAILURE:

1518

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

1519

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

1520

domain,

1521

avahi_strerror(avahi_server_errno

1522

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

992

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

993

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

994

avahi_strerror(avahi_server_errno(mc.server)));

1523

995

break;

1524

996

1525

997

case AVAHI_RESOLVER_FOUND:

1527

999

char ip[AVAHI_ADDRESS_STR_MAX];

1528

1000

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

1529

1001

if(debug){

1530

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

1531

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

1532

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

1002

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

1003

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

1004

ip, (intmax_t)interface, port);

1533

1005

}

1534

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

1535

interface,

1536

avahi_proto_to_af(proto),

1537

mc);

1006

int ret = start_mandos_communication(ip, port, interface,

1007

avahi_proto_to_af(proto));

1538

1008

if(ret == 0){

1539

avahi_simple_poll_quit(simple_poll);

1009

avahi_simple_poll_quit(mc.simple_poll);

1540

1010

} else {

1541

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

1542

avahi_proto_to_af(proto),

1543

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

1544

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

1545

" list\n", name);

1546

}

1011

ret = add_server(ip, port, interface,

1012

avahi_proto_to_af(proto));

1547

1013

}

1548

1014

}

1549

1015

}

1559

1025

const char *domain,

1560

1026

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1561

1027

flags,

1562

void *mc){

1563

if(b == NULL){

1564

return;

1565

}

1028

AVAHI_GCC_UNUSED void* userdata){

1029

assert(b);

1566

1030

1567

1031

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

1568

1032

is removed from the LAN */

1575

1039

default:

1576

1040

case AVAHI_BROWSER_FAILURE:

1577

1041

1578

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

1579

avahi_strerror(avahi_server_errno

1580

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

1581

avahi_simple_poll_quit(simple_poll);

1042

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

1043

avahi_strerror(avahi_server_errno(mc.server)));

1044

avahi_simple_poll_quit(mc.simple_poll);

1582

1045

return;

1583

1046

1584

1047

case AVAHI_BROWSER_NEW:

1587

1050

the callback function is called the Avahi server will free the

1588

1051

resolver for us. */

1589

1052

1590

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

1591

interface, protocol, name, type,

1592

domain, protocol, 0,

1593

resolve_callback, mc) == NULL)

1594

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

1595

" %s\n", name,

1596

avahi_strerror(avahi_server_errno

1597

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

1053

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

1054

name, type, domain, protocol, 0,

1055

resolve_callback, NULL) == NULL)

1056

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

1057

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

1598

1058

break;

1599

1059

1600

1060

case AVAHI_BROWSER_REMOVE:

1603

1063

case AVAHI_BROWSER_ALL_FOR_NOW:

1604

1064

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1605

1065

if(debug){

1606

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

1607

" searching...\n");

1066

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

1608

1067

}

1609

1068

break;

1610

1069

}

1619

1078

signal_received = sig;

1620

1079

int old_errno = errno;

1621

1080

/* set main loop to exit */

1622

if(simple_poll != NULL){

1623

avahi_simple_poll_quit(simple_poll);

1081

if(mc.simple_poll != NULL){

1082

avahi_simple_poll_quit(mc.simple_poll);

1624

1083

}

1625

1084

errno = old_errno;

1626

1085

}

1627

1086

1628

__attribute__((nonnull, warn_unused_result))

1629

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

1630

int ret;

1631

error_t ret_errno;

1632

1633

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

1634

if(s < 0){

1635

ret_errno = errno;

1636

perror_plus("socket");

1637

errno = ret_errno;

1638

return false;

1639

}

1640

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

1641

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

1642

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1643

if(ret == -1){

1087

/*

1088

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

1089

* corresponds to an acceptable network device.

1090

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

1091

*/

1092

int good_interface(const struct dirent *if_entry){

1093

ssize_t ssret;

1094

char *flagname = NULL;

1095

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

1096

return 0;

1097

}

1098

int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,

1099

if_entry->d_name);

1100

if(ret < 0){

1101

perror_plus("asprintf");

1102

return 0;

1103

}

1104

int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));

1105

if(flags_fd == -1){

1106

perror_plus("open");

1107

free(flagname);

1108

return 0;

1109

}

1110

free(flagname);

1111

typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */

1112

/* read line from flags_fd */

1113

ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */

1114

char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */

1115

flagstring[(size_t)to_read] = '\0';

1116

if(flagstring == NULL){

1117

perror_plus("malloc");

1118

close(flags_fd);

1119

return 0;

1120

}

1121

while(to_read > 0){

1122

ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,

1123

(size_t)to_read));

1124

if(ssret == -1){

1125

perror_plus("read");

1126

free(flagstring);

1127

close(flags_fd);

1128

return 0;

1129

}

1130

to_read -= ssret;

1131

if(ssret == 0){

1132

break;

1133

}

1134

}

1135

close(flags_fd);

1136

intmax_t tmpmax;

1137

char *tmp;

1138

errno = 0;

1139

tmpmax = strtoimax(flagstring, &tmp, 0);

1140

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

1141

and not (isspace(*tmp)))

1142

or tmpmax != (ifreq_flags)tmpmax){

1644

1143

if(debug){

1645

ret_errno = errno;

1646

perror_plus("ioctl SIOCGIFFLAGS");

1647

errno = ret_errno;

1144

fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",

1145

flagstring, if_entry->d_name);

1648

1146

}

1649

return false;

1147

free(flagstring);

1148

return 0;

1650

1149

}

1651

return true;

1652

}

1653

1654

__attribute__((nonnull, warn_unused_result))

1655

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

1656

1150

free(flagstring);

1151

ifreq_flags flags = (ifreq_flags)tmpmax;

1657

1152

/* Reject the loopback device */

1658

if(ifr->ifr_flags & IFF_LOOPBACK){

1153

if(flags & IFF_LOOPBACK){

1659

1154

if(debug){

1660

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

1661

ifname);

1155

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

1156

if_entry->d_name);

1662

1157

}

1663

return false;

1158

return 0;

1664

1159

}

1665

1160

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

1666

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

1161

if(connect_to != NULL and (flags & IFF_POINTOPOINT)){

1667

1162

if(debug){

1668

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

1669

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

1163

fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",

1164

if_entry->d_name);

1670

1165

}

1671

return true;

1166

return 1;

1672

1167

}

1673

1168

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

1674

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

1169

if(not (flags & IFF_BROADCAST)){

1675

1170

if(debug){

1676

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1677

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

1171

fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",

1172

if_entry->d_name);

1678

1173

}

1679

return false;

1174

return 0;

1680

1175

}

1681

1176

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

1682

if(ifr->ifr_flags & IFF_NOARP){

1177

if(flags & IFF_NOARP){

1683

1178

if(debug){

1684

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

1685

ifname);

1179

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

1180

if_entry->d_name);

1686

1181

}

1687

return false;

1182

return 0;

1688

1183

}

1689

1690

1184

/* Accept this device */

1691

1185

if(debug){

1692

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

1693

}

1694

return true;

1695

}

1696

1697

/*

1698

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

1699

* corresponds to an acceptable network device.

1700

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

1701

*/

1702

__attribute__((nonnull, warn_unused_result))

1703

int good_interface(const struct dirent *if_entry){

1704

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

1705

return 0;

1706

}

1707

1708

struct ifreq ifr;

1709

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

1710

if(debug){

1711

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

1712

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

1713

}

1714

return 0;

1715

}

1716

1717

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

1718

return 0;

1186

fprintf(stderr, "Interface \"%s\" is acceptable\n",

1187

if_entry->d_name);

1719

1188

}

1720

1189

return 1;

1721

1190

}

1722

1191

1723

/*

1724

* This function determines if a network interface is up.

1725

*/

1726

__attribute__((nonnull, warn_unused_result))

1727

bool interface_is_up(const char *interface){

1728

struct ifreq ifr;

1729

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

1730

if(debug){

1731

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

1732

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

1733

}

1734

return false;

1735

}

1736

1737

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

1738

}

1739

1740

/*

1741

* This function determines if a network interface is running

1742

*/

1743

__attribute__((nonnull, warn_unused_result))

1744

bool interface_is_running(const char *interface){

1745

struct ifreq ifr;

1746

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

1747

if(debug){

1748

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

1749

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

1750

}

1751

return false;

1752

}

1753

1754

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

1755

}

1756

1757

__attribute__((nonnull, pure, warn_unused_result))

1758

1192

int notdotentries(const struct dirent *direntry){

1759

1193

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

1760

1194

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

1766

1200

return 1;

1767

1201

}

1768

1202

1769

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

1770

__attribute__((nonnull, warn_unused_result))

1771

int runnable_hook(const struct dirent *direntry){

1772

int ret;

1773

size_t sret;

1774

struct stat st;

1775

1776

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

1777

/* Empty name? */

1778

return 0;

1779

}

1780

1781

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

1782

"abcdefghijklmnopqrstuvwxyz"

1783

"0123456789"

1784

"_.-");

1785

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

1786

/* Contains non-allowed characters */

1787

if(debug){

1788

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

1789

direntry->d_name);

1790

}

1791

return 0;

1792

}

1793

1794

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

1795

if(ret == -1){

1796

if(debug){

1797

perror_plus("Could not stat hook");

1798

}

1799

return 0;

1800

}

1801

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

1802

/* Not a regular file */

1803

if(debug){

1804

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

1805

direntry->d_name);

1806

}

1807

return 0;

1808

}

1809

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

1810

/* Not executable */

1811

if(debug){

1812

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

1813

direntry->d_name);

1814

}

1815

return 0;

1816

}

1817

if(debug){

1818

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

1819

direntry->d_name);

1820

}

1821

return 1;

1822

}

1823

1824

__attribute__((nonnull, warn_unused_result))

1825

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1826

mandos_context *mc){

1203

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1827

1204

int ret;

1828

1205

struct timespec now;

1829

1206

struct timespec waited_time;

1830

1207

intmax_t block_time;

1831

1208

1832

1209

while(true){

1833

if(mc->current_server == NULL){

1834

if(debug){

1835

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

1836

" No timeout!\n");

1210

if(mc.current_server == NULL){

1211

if (debug){

1212

fprintf(stderr,

1213

"Wait until first server is found. No timeout!\n");

1837

1214

}

1838

1215

ret = avahi_simple_poll_iterate(s, -1);

1839

1216

} else {

1840

if(debug){

1841

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

1842

" it, or wait\n");

1217

if (debug){

1218

fprintf(stderr, "Check current_server if we should run it,"

1219

" or wait\n");

1843

1220

}

1844

1221

/* the current time */

1845

1222

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1850

1227

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

1851

1228

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

1852

1229

waited_time.tv_sec = (now.tv_sec

1853

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

1230

- mc.current_server->last_seen.tv_sec);

1854

1231

waited_time.tv_nsec = (now.tv_nsec

1855

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

1232

- mc.current_server->last_seen.tv_nsec);

1856

1233

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

1857

1234

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

1858

1235

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

1859

1236

block_time = ((retry_interval

1860

1237

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

1861

1238

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

1862

1863

if(debug){

1864

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

1865

block_time);

1239

1240

if (debug){

1241

fprintf(stderr, "Blocking for %ld ms\n", block_time);

1866

1242

}

1867

1243

1868

1244

if(block_time <= 0){

1869

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

1870

mc->current_server->port,

1871

mc->current_server->if_index,

1872

mc->current_server->af, mc);

1245

ret = start_mandos_communication(mc.current_server->ip,

1246

mc.current_server->port,

1247

mc.current_server->if_index,

1248

mc.current_server->af);

1873

1249

if(ret == 0){

1874

avahi_simple_poll_quit(s);

1250

avahi_simple_poll_quit(mc.simple_poll);

1875

1251

return 0;

1876

1252

}

1877

1253

ret = clock_gettime(CLOCK_MONOTONIC,

1878

&mc->current_server->last_seen);

1254

&mc.current_server->last_seen);

1879

1255

if(ret == -1){

1880

1256

perror_plus("clock_gettime");

1881

1257

return -1;

1882

1258

}

1883

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

1259

mc.current_server = mc.current_server->next;

1884

1260

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

1885

1261

servers, but don't block */

1886

1262

}

1888

1264

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

1889

1265

}

1890

1266

if(ret != 0){

1891

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

1267

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

1892

1268

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

1893

1269

}

1894

1270

}

1895

1271

}

1896

1272

}

1897

1273

1898

__attribute__((nonnull))

1899

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

1900

const float delay){

1901

struct dirent **direntries = NULL;

1902

if(hookdir_fd == -1){

1903

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1904

| O_CLOEXEC);

1905

if(hookdir_fd == -1){

1906

if(errno == ENOENT){

1907

if(debug){

1908

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

1909

" found\n", hookdir);

1910

}

1911

} else {

1912

perror_plus("open");

1913

}

1914

return;

1915

}

1916

}

1917

#ifdef __GLIBC__

1918

#if __GLIBC_PREREQ(2, 15)

1919

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

1920

runnable_hook, alphasort);

1921

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

1922

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

1923

alphasort);

1924

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

1925

#else /* not __GLIBC__ */

1926

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

1927

alphasort);

1928

#endif /* not __GLIBC__ */

1929

if(numhooks == -1){

1930

perror_plus("scandir");

1931

return;

1932

}

1933

struct dirent *direntry;

1934

int ret;

1935

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

1936

if(devnull == -1){

1937

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

1938

return;

1939

}

1940

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

1941

direntry = direntries[i];

1942

if(debug){

1943

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

1944

direntry->d_name);

1945

}

1946

pid_t hook_pid = fork();

1947

if(hook_pid == 0){

1948

/* Child */

1949

/* Raise privileges */

1950

errno = raise_privileges_permanently();

1951

if(errno != 0){

1952

perror_plus("Failed to raise privileges");

1953

_exit(EX_NOPERM);

1954

}

1955

/* Set group */

1956

errno = 0;

1957

ret = setgid(0);

1958

if(ret == -1){

1959

perror_plus("setgid");

1960

_exit(EX_NOPERM);

1961

}

1962

/* Reset supplementary groups */

1963

errno = 0;

1964

ret = setgroups(0, NULL);

1965

if(ret == -1){

1966

perror_plus("setgroups");

1967

_exit(EX_NOPERM);

1968

}

1969

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

1970

if(ret == -1){

1971

perror_plus("setenv");

1972

_exit(EX_OSERR);

1973

}

1974

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

1975

if(ret == -1){

1976

perror_plus("setenv");

1977

_exit(EX_OSERR);

1978

}

1979

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

1980

if(ret == -1){

1981

perror_plus("setenv");

1982

_exit(EX_OSERR);

1983

}

1984

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

1985

if(ret == -1){

1986

perror_plus("setenv");

1987

_exit(EX_OSERR);

1988

}

1989

char *delaystring;

1990

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

1991

if(ret == -1){

1992

perror_plus("asprintf");

1993

_exit(EX_OSERR);

1994

}

1995

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

1996

if(ret == -1){

1997

free(delaystring);

1998

perror_plus("setenv");

1999

_exit(EX_OSERR);

2000

}

2001

free(delaystring);

2002

if(connect_to != NULL){

2003

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

2004

if(ret == -1){

2005

perror_plus("setenv");

2006

_exit(EX_OSERR);

2007

}

2008

}

2009

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

2010

direntry->d_name,

2011

O_RDONLY));

2012

if(hook_fd == -1){

2013

perror_plus("openat");

2014

_exit(EXIT_FAILURE);

2015

}

2016

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

2017

perror_plus("close");

2018

_exit(EXIT_FAILURE);

2019

}

2020

ret = dup2(devnull, STDIN_FILENO);

2021

if(ret == -1){

2022

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

2023

_exit(EX_OSERR);

2024

}

2025

ret = close(devnull);

2026

if(ret == -1){

2027

perror_plus("close");

2028

_exit(EX_OSERR);

2029

}

2030

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2031

if(ret == -1){

2032

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

2033

_exit(EX_OSERR);

2034

}

2035

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

2036

environ) == -1){

2037

perror_plus("fexecve");

2038

_exit(EXIT_FAILURE);

2039

}

2040

} else {

2041

if(hook_pid == -1){

2042

perror_plus("fork");

2043

free(direntry);

2044

continue;

2045

}

2046

int status;

2047

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

2048

perror_plus("waitpid");

2049

free(direntry);

2050

continue;

2051

}

2052

if(WIFEXITED(status)){

2053

if(WEXITSTATUS(status) != 0){

2054

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

2055

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

2056

WEXITSTATUS(status));

2057

free(direntry);

2058

continue;

2059

}

2060

} else if(WIFSIGNALED(status)){

2061

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

2062

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

2063

WTERMSIG(status));

2064

free(direntry);

2065

continue;

2066

} else {

2067

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

2068

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

2069

free(direntry);

2070

continue;

2071

}

2072

}

2073

if(debug){

2074

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

2075

direntry->d_name);

2076

}

2077

free(direntry);

2078

}

2079

free(direntries);

2080

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

2081

perror_plus("close");

2082

} else {

2083

hookdir_fd = -1;

2084

}

2085

close(devnull);

2086

}

2087

2088

__attribute__((nonnull, warn_unused_result))

2089

error_t bring_up_interface(const char *const interface,

2090

const float delay){

2091

error_t old_errno = errno;

2092

int ret;

2093

struct ifreq network;

2094

unsigned int if_index = if_nametoindex(interface);

2095

if(if_index == 0){

2096

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

2097

errno = old_errno;

2098

return ENXIO;

2099

}

2100

2101

if(quit_now){

2102

errno = old_errno;

2103

return EINTR;

2104

}

2105

2106

if(not interface_is_up(interface)){

2107

error_t ret_errno = 0, ioctl_errno = 0;

2108

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

2109

ret_errno = errno;

2110

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

2111

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

2112

errno = old_errno;

2113

return ret_errno;

2114

}

2115

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

2116

2117

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

2118

if(sd == -1){

2119

ret_errno = errno;

2120

perror_plus("socket");

2121

errno = old_errno;

2122

return ret_errno;

2123

}

2124

2125

if(quit_now){

2126

ret = close(sd);

2127

if(ret == -1){

2128

perror_plus("close");

2129

}

2130

errno = old_errno;

2131

return EINTR;

2132

}

2133

2134

if(debug){

2135

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

2136

interface);

2137

}

2138

2139

/* Raise privileges */

2140

ret_errno = raise_privileges();

2141

if(ret_errno != 0){

2142

errno = ret_errno;

2143

perror_plus("Failed to raise privileges");

2144

}

2145

2146

#ifdef __linux__

2147

int ret_linux;

2148

bool restore_loglevel = false;

2149

if(ret_errno == 0){

2150

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2151

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

2152

ret_linux = klogctl(8, NULL, 5);

2153

if(ret_linux == -1){

2154

perror_plus("klogctl");

2155

} else {

2156

restore_loglevel = true;

2157

}

2158

}

2159

#endif /* __linux__ */

2160

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

2161

ioctl_errno = errno;

2162

#ifdef __linux__

2163

if(restore_loglevel){

2164

ret_linux = klogctl(7, NULL, 0);

2165

if(ret_linux == -1){

2166

perror_plus("klogctl");

2167

}

2168

}

2169

#endif /* __linux__ */

2170

2171

/* If raise_privileges() succeeded above */

2172

if(ret_errno == 0){

2173

/* Lower privileges */

2174

ret_errno = lower_privileges();

2175

if(ret_errno != 0){

2176

errno = ret_errno;

2177

perror_plus("Failed to lower privileges");

2178

}

2179

}

2180

2181

/* Close the socket */

2182

ret = close(sd);

2183

if(ret == -1){

2184

perror_plus("close");

2185

}

2186

2187

if(ret_setflags == -1){

2188

errno = ioctl_errno;

2189

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2190

errno = old_errno;

2191

return ioctl_errno;

2192

}

2193

} else if(debug){

2194

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

2195

interface);

2196

}

2197

2198

/* Sleep checking until interface is running.

2199

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

2200

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

2201

if(interface_is_running(interface)){

2202

break;

2203

}

2204

struct timespec sleeptime = { .tv_nsec = 250000000 };

2205

ret = nanosleep(&sleeptime, NULL);

2206

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

2207

perror_plus("nanosleep");

2208

}

2209

}

2210

2211

errno = old_errno;

2212

return 0;

2213

}

2214

2215

__attribute__((nonnull, warn_unused_result))

2216

error_t take_down_interface(const char *const interface){

2217

error_t old_errno = errno;

2218

struct ifreq network;

2219

unsigned int if_index = if_nametoindex(interface);

2220

if(if_index == 0){

2221

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

2222

errno = old_errno;

2223

return ENXIO;

2224

}

2225

if(interface_is_up(interface)){

2226

error_t ret_errno = 0, ioctl_errno = 0;

2227

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

2228

ret_errno = errno;

2229

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

2230

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

2231

errno = old_errno;

2232

return ret_errno;

2233

}

2234

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

2235

2236

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

2237

if(sd == -1){

2238

ret_errno = errno;

2239

perror_plus("socket");

2240

errno = old_errno;

2241

return ret_errno;

2242

}

2243

2244

if(debug){

2245

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

2246

interface);

2247

}

2248

2249

/* Raise privileges */

2250

ret_errno = raise_privileges();

2251

if(ret_errno != 0){

2252

errno = ret_errno;

2253

perror_plus("Failed to raise privileges");

2254

}

2255

2256

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

2257

ioctl_errno = errno;

2258

2259

/* If raise_privileges() succeeded above */

2260

if(ret_errno == 0){

2261

/* Lower privileges */

2262

ret_errno = lower_privileges();

2263

if(ret_errno != 0){

2264

errno = ret_errno;

2265

perror_plus("Failed to lower privileges");

2266

}

2267

}

2268

2269

/* Close the socket */

2270

int ret = close(sd);

2271

if(ret == -1){

2272

perror_plus("close");

2273

}

2274

2275

if(ret_setflags == -1){

2276

errno = ioctl_errno;

2277

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2278

errno = old_errno;

2279

return ioctl_errno;

2280

}

2281

} else if(debug){

2282

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

2283

interface);

2284

}

2285

2286

errno = old_errno;

2287

return 0;

2288

}

2289

2290

1274

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

2291

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

2292

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

2293

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

2294

.current_server = NULL, .interfaces = NULL,

2295

.interfaces_size = 0 };

2296

1275

AvahiSServiceBrowser *sb = NULL;

2297

error_t ret_errno;

1276

int error;

2298

1277

int ret;

2299

1278

intmax_t tmpmax;

2300

1279

char *tmp;

2301

1280

int exitcode = EXIT_SUCCESS;

2302

char *interfaces_to_take_down = NULL;

2303

size_t interfaces_to_take_down_size = 0;

2304

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

2305

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

2306

char *tempdir = NULL;

1281

const char *interface = "";

1282

struct ifreq network;

1283

int sd = -1;

1284

bool take_down_interface = false;

1285

uid_t uid;

1286

gid_t gid;

1287

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

1288

bool tempdir_created = false;

2307

1289

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2308

1290

const char *seckey = PATHDIR "/" SECKEY;

2309

1291

const char *pubkey = PATHDIR "/" PUBKEY;

2310

const char *dh_params_file = NULL;

2311

char *interfaces_hooks = NULL;

2312

1292

2313

1293

bool gnutls_initialized = false;

2314

1294

bool gpgme_initialized = false;

2366

1346

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

2367

1347

" Diffie-Hellman key exchange",

2368

1348

.group = 2 },

2369

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

2370

.arg = "FILE",

2371

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

2372

" for the Diffie-Hellman key exchange",

2373

.group = 2 },

2374

1349

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

2375

1350

.arg = "STRING",

2376

1351

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

2381

1356

.group = 2 },

2382

1357

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

2383

1358

.arg = "SECONDS",

2384

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

2385

.group = 2 },

2386

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

2387

.arg = "DIR",

2388

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

1359

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

2389

1360

.group = 2 },

2390

1361

/*

2391

1362

* These reproduce what we would get without ARGP_NO_HELP

2410

1381

connect_to = arg;

2411

1382

break;

2412

1383

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

2413

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

2414

arg, (int)',');

2415

if(ret_errno != 0){

2416

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

2417

}

1384

interface = arg;

2418

1385

break;

2419

1386

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

2420

1387

seckey = arg;

2431

1398

}

2432

1399

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

2433

1400

break;

2434

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

2435

dh_params_file = arg;

2436

break;

2437

1401

case 130: /* --priority */

2438

1402

mc.priority = arg;

2439

1403

break;

2447

1411

errno = 0;

2448

1412

retry_interval = strtod(arg, &tmp);

2449

1413

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

2450

or (retry_interval * 1000) > INT_MAX

2451

or retry_interval < 0){

1414

or (retry_interval * 1000) > INT_MAX){

2452

1415

argp_error(state, "Bad retry interval");

2453

1416

}

2454

1417

break;

2455

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

2456

hookdir = arg;

2457

break;

2458

1418

/*

2459

1419

* These reproduce what we would get without ARGP_NO_HELP

2460

1420

*/

2466

1426

argp_state_help(state, state->out_stream,

2467

1427

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

2468

1428

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

2469

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

1429

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

2470

1430

exit(argp_err_exit_status);

2471

1431

break;

2472

1432

default:

2495

1455

goto end;

2496

1456

}

2497

1457

}

2498

1458

2499

1459

{

2500

1460

/* Work around Debian bug #633582:

2501

1461

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

2502

2503

/* Re-raise privileges */

2504

ret_errno = raise_privileges();

2505

if(ret_errno != 0){

2506

errno = ret_errno;

2507

perror_plus("Failed to raise privileges");

2508

} else {

2509

struct stat st;

2510

2511

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

2512

int seckey_fd = open(seckey, O_RDONLY);

2513

if(seckey_fd == -1){

2514

perror_plus("open");

2515

} else {

2516

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

2517

if(ret == -1){

2518

perror_plus("fstat");

2519

} else {

2520

if(S_ISREG(st.st_mode)

2521

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

2522

ret = fchown(seckey_fd, uid, gid);

2523

if(ret == -1){

2524

perror_plus("fchown");

2525

}

2526

}

2527

}

2528

close(seckey_fd);

2529

}

2530

}

2531

2532

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

2533

int pubkey_fd = open(pubkey, O_RDONLY);

2534

if(pubkey_fd == -1){

2535

perror_plus("open");

2536

} else {

2537

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

2538

if(ret == -1){

2539

perror_plus("fstat");

2540

} else {

2541

if(S_ISREG(st.st_mode)

2542

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

2543

ret = fchown(pubkey_fd, uid, gid);

2544

if(ret == -1){

2545

perror_plus("fchown");

2546

}

2547

}

2548

}

2549

close(pubkey_fd);

2550

}

2551

}

2552

2553

if(dh_params_file != NULL

2554

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

2555

int dhparams_fd = open(dh_params_file, O_RDONLY);

2556

if(dhparams_fd == -1){

2557

perror_plus("open");

2558

} else {

2559

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

2560

if(ret == -1){

2561

perror_plus("fstat");

2562

} else {

2563

if(S_ISREG(st.st_mode)

2564

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

2565

ret = fchown(dhparams_fd, uid, gid);

2566

if(ret == -1){

2567

perror_plus("fchown");

2568

}

2569

}

2570

}

2571

close(dhparams_fd);

2572

}

2573

}

2574

2575

/* Lower privileges */

2576

ret_errno = lower_privileges();

2577

if(ret_errno != 0){

2578

errno = ret_errno;

2579

perror_plus("Failed to lower privileges");

2580

}

2581

}

2582

}

2583

2584

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

2585

{

2586

char *interface = NULL;

2587

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

2588

interface))){

2589

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

2590

and if_nametoindex(interface) == 0){

2591

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

2592

fprintf_plus(stderr, "Not using nonexisting interface"

2593

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

2594

}

2595

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

2596

interface = NULL;

2597

}

2598

}

2599

}

2600

2601

/* Run network hooks */

2602

{

2603

if(mc.interfaces != NULL){

2604

interfaces_hooks = malloc(mc.interfaces_size);

2605

if(interfaces_hooks == NULL){

2606

perror_plus("malloc");

2607

goto end;

2608

}

2609

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

2610

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

2611

}

2612

run_network_hooks("start", interfaces_hooks != NULL ?

2613

interfaces_hooks : "", delay);

1462

struct stat st;

1463

1464

/* Re-raise priviliges */

1465

errno = 0;

1466

ret = seteuid(0);

1467

if(ret == -1){

1468

perror_plus("seteuid");

1469

}

1470

1471

int seckey_fd = open(PATHDIR "/" SECKEY, O_RDONLY);

1472

if(seckey_fd == -1){

1473

perror_plus("open");

1474

} else {

1475

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

1476

if(ret == -1){

1477

perror_plus("fstat");

1478

} else {

1479

if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){

1480

ret = fchown(seckey_fd, uid, gid);

1481

if(ret == -1){

1482

perror_plus("fchown");

1483

}

1484

}

1485

}

1486

TEMP_FAILURE_RETRY(close(seckey_fd));

1487

}

1488

1489

int pubkey_fd = open(PATHDIR "/" PUBKEY, O_RDONLY);

1490

if(pubkey_fd == -1){

1491

perror_plus("open");

1492

} else {

1493

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

1494

if(ret == -1){

1495

perror_plus("fstat");

1496

} else {

1497

if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){

1498

ret = fchown(pubkey_fd, uid, gid);

1499

if(ret == -1){

1500

perror_plus("fchown");

1501

}

1502

}

1503

}

1504

TEMP_FAILURE_RETRY(close(pubkey_fd));

1505

}

1506

1507

/* Lower privileges */

1508

errno = 0;

1509

ret = seteuid(uid);

1510

if(ret == -1){

1511

perror_plus("seteuid");

1512

}

2614

1513

}

2615

1514

2616

1515

if(not debug){

2617

1516

avahi_set_log_function(empty_log);

2618

1517

}

1518

1519

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

1520

struct dirent **direntries;

1521

ret = scandir(sys_class_net, &direntries, good_interface,

1522

alphasort);

1523

if(ret >= 1){

1524

/* Pick the first good interface */

1525

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

1526

if(debug){

1527

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

1528

}

1529

if(interface == NULL){

1530

perror_plus("malloc");

1531

free(direntries);

1532

exitcode = EXIT_FAILURE;

1533

goto end;

1534

}

1535

free(direntries);

1536

} else {

1537

free(direntries);

1538

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

1539

exitcode = EXIT_FAILURE;

1540

goto end;

1541

}

1542

}

2619

1543

2620

1544

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

2621

1545

from the signal handler */

2622

1546

/* Initialize the pseudo-RNG for Avahi */

2623

1547

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

2624

simple_poll = avahi_simple_poll_new();

2625

if(simple_poll == NULL){

2626

fprintf_plus(stderr,

2627

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

1548

mc.simple_poll = avahi_simple_poll_new();

1549

if(mc.simple_poll == NULL){

1550

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

2628

1551

exitcode = EX_UNAVAILABLE;

2629

1552

goto end;

2630

1553

}

2692

1615

}

2693

1616

}

2694

1617

2695

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

2696

if(mc.interfaces == NULL){

2697

struct dirent **direntries = NULL;

2698

/* Look for any good interfaces */

2699

ret = scandir(sys_class_net, &direntries, good_interface,

2700

alphasort);

2701

if(ret >= 1){

2702

/* Add all found interfaces to interfaces list */

2703

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

2704

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

2705

direntries[i]->d_name);

2706

if(ret_errno != 0){

2707

errno = ret_errno;

2708

perror_plus("argz_add");

2709

free(direntries[i]);

2710

continue;

2711

}

2712

if(debug){

2713

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

2714

direntries[i]->d_name);

2715

}

2716

free(direntries[i]);

2717

}

2718

free(direntries);

1618

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

1619

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

1620

if_index = (AvahiIfIndex) if_nametoindex(interface);

1621

if(if_index == 0){

1622

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

1623

exitcode = EX_UNAVAILABLE;

1624

goto end;

1625

}

1626

1627

if(quit_now){

1628

goto end;

1629

}

1630

1631

/* Re-raise priviliges */

1632

errno = 0;

1633

ret = seteuid(0);

1634

if(ret == -1){

1635

perror_plus("seteuid");

1636

}

1637

1638

#ifdef __linux__

1639

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1640

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

1641

ret = klogctl(8, NULL, 5);

1642

bool restore_loglevel = true;

1643

if(ret == -1){

1644

restore_loglevel = false;

1645

perror_plus("klogctl");

1646

}

1647

#endif /* __linux__ */

1648

1649

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1650

if(sd < 0){

1651

perror_plus("socket");

1652

exitcode = EX_OSERR;

1653

#ifdef __linux__

1654

if(restore_loglevel){

1655

ret = klogctl(7, NULL, 0);

1656

if(ret == -1){

1657

perror_plus("klogctl");

1658

}

1659

}

1660

#endif /* __linux__ */

1661

/* Lower privileges */

1662

errno = 0;

1663

ret = seteuid(uid);

1664

if(ret == -1){

1665

perror_plus("seteuid");

1666

}

1667

goto end;

1668

}

1669

strcpy(network.ifr_name, interface);

1670

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

1671

if(ret == -1){

1672

perror_plus("ioctl SIOCGIFFLAGS");

1673

#ifdef __linux__

1674

if(restore_loglevel){

1675

ret = klogctl(7, NULL, 0);

1676

if(ret == -1){

1677

perror_plus("klogctl");

1678

}

1679

}

1680

#endif /* __linux__ */

1681

exitcode = EX_OSERR;

1682

/* Lower privileges */

1683

errno = 0;

1684

ret = seteuid(uid);

1685

if(ret == -1){

1686

perror_plus("seteuid");

1687

}

1688

goto end;

1689

}

1690

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

1691

network.ifr_flags |= IFF_UP;

1692

take_down_interface = true;

1693

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

1694

if(ret == -1){

1695

take_down_interface = false;

1696

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1697

exitcode = EX_OSERR;

1698

#ifdef __linux__

1699

if(restore_loglevel){

1700

ret = klogctl(7, NULL, 0);

1701

if(ret == -1){

1702

perror_plus("klogctl");

1703

}

1704

}

1705

#endif /* __linux__ */

1706

/* Lower privileges */

1707

errno = 0;

1708

ret = seteuid(uid);

1709

if(ret == -1){

1710

perror_plus("seteuid");

1711

}

1712

goto end;

1713

}

1714

}

1715

/* Sleep checking until interface is running.

1716

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

1717

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

1718

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

1719

if(ret == -1){

1720

perror_plus("ioctl SIOCGIFFLAGS");

1721

} else if(network.ifr_flags & IFF_RUNNING){

1722

break;

1723

}

1724

struct timespec sleeptime = { .tv_nsec = 250000000 };

1725

ret = nanosleep(&sleeptime, NULL);

1726

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

1727

perror_plus("nanosleep");

1728

}

1729

}

1730

if(not take_down_interface){

1731

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

1732

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

1733

if(ret == -1){

1734

perror_plus("close");

1735

}

1736

}

1737

#ifdef __linux__

1738

if(restore_loglevel){

1739

/* Restores kernel loglevel to default */

1740

ret = klogctl(7, NULL, 0);

1741

if(ret == -1){

1742

perror_plus("klogctl");

1743

}

1744

}

1745

#endif /* __linux__ */

1746

/* Lower privileges */

1747

errno = 0;

1748

if(take_down_interface){

1749

/* Lower privileges */

1750

ret = seteuid(uid);

1751

if(ret == -1){

1752

perror_plus("seteuid");

1753

}

2719

1754

} else {

2720

if(ret == 0){

2721

free(direntries);

2722

}

2723

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

2724

exitcode = EXIT_FAILURE;

2725

goto end;

2726

}

2727

}

2728

2729

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

2730

{

2731

char *interface = NULL;

2732

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

2733

interface))){

2734

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

2735

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

2736

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

2737

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

2738

interface);

2739

interface = NULL;

2740

while((interface = argz_next(mc.interfaces,

2741

mc.interfaces_size, interface))){

2742

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

2743

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

2744

interface);

2745

interface = NULL;

2746

}

2747

}

2748

break;

2749

}

2750

bool interface_was_up = interface_is_up(interface);

2751

errno = bring_up_interface(interface, delay);

2752

if(not interface_was_up){

2753

if(errno != 0){

2754

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

2755

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

2756

} else {

2757

errno = argz_add(&interfaces_to_take_down,

2758

&interfaces_to_take_down_size,

2759

interface);

2760

if(errno != 0){

2761

perror_plus("argz_add");

2762

}

2763

}

2764

}

2765

}

2766

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

2767

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

2768

}

2769

}

2770

2771

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

2772

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

2773

if(debug){

2774

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

2775

mc.interfaces);

2776

}

2777

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

1755

/* Lower privileges permanently */

1756

ret = setuid(uid);

1757

if(ret == -1){

1758

perror_plus("setuid");

1759

}

1760

}

2778

1761

}

2779

1762

2780

1763

if(quit_now){

2781

1764

goto end;

2782

1765

}

2783

1766

2784

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

1767

ret = init_gnutls_global(pubkey, seckey);

2785

1768

if(ret == -1){

2786

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

1769

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

2787

1770

exitcode = EX_UNAVAILABLE;

2788

1771

goto end;

2789

1772

} else {

2794

1777

goto end;

2795

1778

}

2796

1779

2797

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

2798

tempdir = mkdtemp(run_tempdir);

2799

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

2800

if(debug){

2801

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

2802

run_tempdir, old_tempdir);

2803

}

2804

tempdir = mkdtemp(old_tempdir);

2805

}

2806

if(tempdir == NULL){

1780

if(mkdtemp(tempdir) == NULL){

2807

1781

perror_plus("mkdtemp");

2808

1782

goto end;

2809

1783

}

1784

tempdir_created = true;

2810

1785

2811

1786

if(quit_now){

2812

1787

goto end;

2813

1788

}

2814

1789

2815

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

2816

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

1790

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

1791

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

2817

1792

exitcode = EX_UNAVAILABLE;

2818

1793

goto end;

2819

1794

} else {

2828

1803

/* Connect directly, do not use Zeroconf */

2829

1804

/* (Mainly meant for debugging) */

2830

1805

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

2831

2832

1806

if(address == NULL){

2833

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

1807

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

2834

1808

exitcode = EX_USAGE;

2835

1809

goto end;

2836

1810

}

2839

1813

goto end;

2840

1814

}

2841

1815

2842

in_port_t port;

1816

uint16_t port;

2843

1817

errno = 0;

2844

1818

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

2845

1819

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

2846

or tmpmax != (in_port_t)tmpmax){

2847

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

1820

or tmpmax != (uint16_t)tmpmax){

1821

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

2848

1822

exitcode = EX_USAGE;

2849

1823

goto end;

2850

1824

}

2851

1825

2852

1826

if(quit_now){

2853

1827

goto end;

2854

1828

}

2855

1829

2856

port = (in_port_t)tmpmax;

1830

port = (uint16_t)tmpmax;

2857

1831

*address = '\0';

1832

address = connect_to;

2858

1833

/* Colon in address indicates IPv6 */

2859

1834

int af;

2860

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

1835

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

2861

1836

af = AF_INET6;

2862

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

2863

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

2864

{

2865

connect_to++;

2866

address[-1] = '\0';

2867

}

2868

1837

} else {

2869

1838

af = AF_INET;

2870

1839

}

2871

address = connect_to;

2872

1840

2873

1841

if(quit_now){

2874

1842

goto end;

2875

1843

}

2876

1844

2877

1845

while(not quit_now){

2878

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

2879

&mc);

1846

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

2880

1847

if(quit_now or ret == 0){

2881

1848

break;

2882

1849

}

2883

if(debug){

2884

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

2885

(int)retry_interval);

2886

}

2887

sleep((unsigned int)retry_interval);

2888

}

2889

2890

if(not quit_now){

1850

sleep((int)retry_interval or 1);

1851

};

1852

1853

if (not quit_now){

2891

1854

exitcode = EXIT_SUCCESS;

2892

1855

}

2893

1856

2894

1857

goto end;

2895

1858

}

2896

1859

2908

1871

config.publish_domain = 0;

2909

1872

2910

1873

/* Allocate a new server */

2911

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2912

&config, NULL, NULL, &ret_errno);

1874

mc.server = avahi_server_new(avahi_simple_poll_get

1875

(mc.simple_poll), &config, NULL,

1876

NULL, &error);

2913

1877

2914

1878

/* Free the Avahi configuration data */

2915

1879

avahi_server_config_free(&config);

2917

1881

2918

1882

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

2919

1883

if(mc.server == NULL){

2920

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

2921

avahi_strerror(ret_errno));

1884

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

1885

avahi_strerror(error));

2922

1886

exitcode = EX_UNAVAILABLE;

2923

1887

goto end;

2924

1888

}

2930

1894

/* Create the Avahi service browser */

2931

1895

sb = avahi_s_service_browser_new(mc.server, if_index,

2932

1896

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2933

NULL, 0, browse_callback,

2934

(void *)&mc);

1897

NULL, 0, browse_callback, NULL);

2935

1898

if(sb == NULL){

2936

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

2937

avahi_strerror(avahi_server_errno(mc.server)));

1899

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

1900

avahi_strerror(avahi_server_errno(mc.server)));

2938

1901

exitcode = EX_UNAVAILABLE;

2939

1902

goto end;

2940

1903

}

2946

1909

/* Run the main loop */

2947

1910

2948

1911

if(debug){

2949

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

1912

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

2950

1913

}

2951

2952

ret = avahi_loop_with_timeout(simple_poll,

2953

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

1914

1915

ret = avahi_loop_with_timeout(mc.simple_poll,

1916

(int)(retry_interval * 1000));

2954

1917

if(debug){

2955

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

2956

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

1918

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

1919

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

2957

1920

}

2958

1921

2959

1922

end:

2960

1923

2961

1924

if(debug){

2962

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

1925

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

2963

1926

}

2964

1927

2965

1928

/* Cleanup things */

2966

free(mc.interfaces);

2967

2968

1929

if(sb != NULL)

2969

1930

avahi_s_service_browser_free(sb);

2970

1931

2971

1932

if(mc.server != NULL)

2972

1933

avahi_server_free(mc.server);

2973

1934

2974

if(simple_poll != NULL)

2975

avahi_simple_poll_free(simple_poll);

1935

if(mc.simple_poll != NULL)

1936

avahi_simple_poll_free(mc.simple_poll);

2976

1937

2977

1938

if(gnutls_initialized){

2978

1939

gnutls_certificate_free_credentials(mc.cred);

2983

1944

if(gpgme_initialized){

2984

1945

gpgme_release(mc.ctx);

2985

1946

}

2986

1947

2987

1948

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

2988

1949

has seen */

2989

1950

if(mc.current_server != NULL){

2990

1951

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

2991

1952

while(mc.current_server != NULL){

2992

1953

server *next = mc.current_server->next;

2993

#ifdef __GNUC__

2994

#pragma GCC diagnostic push

2995

#pragma GCC diagnostic ignored "-Wcast-qual"

2996

#endif

2997

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

2998

#ifdef __GNUC__

2999

#pragma GCC diagnostic pop

3000

#endif

3001

1954

free(mc.current_server);

3002

1955

mc.current_server = next;

3003

1956

}

3004

1957

}

3005

1958

3006

/* Re-raise privileges */

3007

{

3008

ret_errno = raise_privileges();

3009

if(ret_errno != 0){

3010

errno = ret_errno;

3011

perror_plus("Failed to raise privileges");

3012

} else {

3013

3014

/* Run network hooks */

3015

run_network_hooks("stop", interfaces_hooks != NULL ?

3016

interfaces_hooks : "", delay);

3017

3018

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

3019

{

3020

char *interface = NULL;

3021

while((interface=argz_next(interfaces_to_take_down,

3022

interfaces_to_take_down_size,

3023

interface))){

3024

ret_errno = take_down_interface(interface);

3025

if(ret_errno != 0){

3026

errno = ret_errno;

3027

perror_plus("Failed to take down interface");

3028

}

3029

}

3030

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

3031

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

3032

" down\n");

3033

}

3034

}

1959

/* Take down the network interface */

1960

if(take_down_interface){

1961

/* Re-raise priviliges */

1962

errno = 0;

1963

ret = seteuid(0);

1964

if(ret == -1){

1965

perror_plus("seteuid");

3035

1966

}

3036

3037

ret_errno = lower_privileges_permanently();

3038

if(ret_errno != 0){

3039

errno = ret_errno;

3040

perror_plus("Failed to lower privileges permanently");

1967

if(geteuid() == 0){

1968

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

1969

if(ret == -1){

1970

perror_plus("ioctl SIOCGIFFLAGS");

1971

} else if(network.ifr_flags & IFF_UP) {

1972

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

1973

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

1974

if(ret == -1){

1975

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1976

}

1977

}

1978

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

1979

if(ret == -1){

1980

perror_plus("close");

1981

}

1982

/* Lower privileges permanently */

1983

errno = 0;

1984

ret = setuid(uid);

1985

if(ret == -1){

1986

perror_plus("setuid");

1987

}

3041

1988

}

3042

1989

}

3043

1990

3044

free(interfaces_to_take_down);

3045

free(interfaces_hooks);

3046

3047

1991

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

3048

if(tempdir != NULL){

1992

if(tempdir_created){

3049

1993

struct dirent **direntries = NULL;

3050

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

3051

| O_NOFOLLOW

3052

| O_DIRECTORY

3053

| O_PATH));

3054

if(tempdir_fd == -1){

3055

perror_plus("open");

3056

} else {

3057

#ifdef __GLIBC__

3058

#if __GLIBC_PREREQ(2, 15)

3059

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

3060

notdotentries, alphasort);

3061

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

3062

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

3063

alphasort);

3064

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

3065

#else /* not __GLIBC__ */

3066

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

3067

alphasort);

3068

#endif /* not __GLIBC__ */

3069

if(numentries >= 0){

3070

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

3071

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

3072

if(ret == -1){

3073

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

3074

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

3075

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

3076

}

3077

free(direntries[i]);

3078

}

3079

3080

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

3081

free(direntries);

3082

if(numentries == -1){

3083

perror_plus("scandir");

3084

}

3085

ret = rmdir(tempdir);

3086

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

3087

perror_plus("rmdir");

3088

}

1994

struct dirent *direntry = NULL;

1995

ret = scandir(tempdir, &direntries, notdotentries, alphasort);

1996

if (ret > 0){

1997

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

1998

direntry = direntries[i];

1999

char *fullname = NULL;

2000

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

2001

direntry->d_name);

2002

if(ret < 0){

2003

perror_plus("asprintf");

2004

continue;

2005

}

2006

ret = remove(fullname);

2007

if(ret == -1){

2008

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

2009

strerror(errno));

2010

}

2011

free(fullname);

3089

2012

}

3090

close(tempdir_fd);

2013

}

2014

2015

/* need to be cleaned even if ret == 0 because man page doesn't

2016

specify */

2017

free(direntries);

2018

if (ret == -1){

2019

perror_plus("scandir");

2020

}

2021

ret = rmdir(tempdir);

2022

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

2023

perror_plus("rmdir");

3091

2024

}

3092

2025

}

3093

2026