/mandos/release : revision 237.7.240

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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

32

/* 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

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#endif /* not _LARGEFILE_SOURCE */

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#ifndef _FILE_OFFSET_BITS

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#define _FILE_OFFSET_BITS 64

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#endif

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#endif /* not _FILE_OFFSET_BITS */

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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(), remove() */

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

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

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

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

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strtof(), abort() */

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sockaddr_in6, PF_INET6,

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SOCK_STREAM, uid_t, gid_t, open(),

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opendir(), DIR */

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

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

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

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inet_pton(), connect() */

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inet_pton(), connect(),

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getnameinfo() */

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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() */

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

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

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

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

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

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argp_state, struct argp,

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raise() */

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

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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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

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WEXITSTATUS(), WTERMSIG() */

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

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

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argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

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argz_count() */

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

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EAI_SYSTEM, gai_strerror() */

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#ifdef __linux__

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

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

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char *connect_to = NULL;

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const char *hookdir = HOOKDIR;

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int hookdir_fd = -1;

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uid_t uid = 65534;

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gid_t gid = 65534;

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

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typedef struct server{

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const char *ip;

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uint16_t port;

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in_port_t port;

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AvahiIfIndex if_index;

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int af;

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struct timespec last_seen;

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

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AvahiSimplePoll *simple_poll;

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sig_atomic_t quit_now = 0;

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int signal_received = 0;

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/* Function to use when printing errors */

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void perror_plus(const char *print_text){

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int e = errno;

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

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program_invocation_short_name);

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errno = e;

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perror(print_text);

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}

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

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

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va_list ap;

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va_start (ap, format);

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192

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

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program_invocation_short_name));

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

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}

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/*

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

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

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* "buffer_length" is how much is already used.

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201

*/

202

__attribute__((nonnull, warn_unused_result))

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203

size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

204

size_t buffer_capacity){

181

205

if(buffer_length + BUFFER_SIZE > buffer_capacity){

182

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

183

if(buffer == NULL){

206

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

207

if(new_buf == NULL){

208

int old_errno = errno;

209

free(*buffer);

210

errno = old_errno;

211

*buffer = NULL;

184

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return 0;

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213

}

214

*buffer = new_buf;

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215

buffer_capacity += BUFFER_SIZE;

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216

}

188

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return buffer_capacity;

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218

}

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219

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

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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){

221

__attribute__((nonnull, warn_unused_result))

222

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

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int af, server **current_server){

195

224

int ret;

196

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

197

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if(new_server == NULL){

198

227

perror_plus("malloc");

199

return -1;

228

return false;

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229

}

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

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.port = port,

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.if_index = if_index,

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.af = af };

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.port = port,

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.if_index = if_index,

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.af = af };

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if(new_server->ip == NULL){

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perror_plus("strdup");

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return -1;

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return false;

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}

238

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

239

if(ret == -1){

240

perror_plus("clock_gettime");

241

return false;

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}

209

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/* Special case of first server */

210

if (mc.current_server == NULL){

244

if(*current_server == NULL){

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245

new_server->next = new_server;

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new_server->prev = new_server;

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mc.current_server = new_server;

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

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*current_server = new_server;

215

248

} else {

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new_server->next = mc.current_server;

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

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

250

new_server->next = *current_server;

251

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

218

252

new_server->prev->next = new_server;

219

mc.current_server->prev = new_server;

220

}

221

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

222

if(ret == -1){

223

perror_plus("clock_gettime");

224

return -1;

225

}

226

return 0;

253

(*current_server)->prev = new_server;

254

}

255

return true;

227

256

}

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257

229

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/*

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259

* Initialize GPGME.

231

260

*/

232

static bool init_gpgme(const char *seckey,

233

const char *pubkey, const char *tempdir){

261

__attribute__((nonnull, warn_unused_result))

262

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){

234

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gpgme_error_t rc;

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gpgme_engine_info_t engine_info;

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268

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/*

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

240

271

*/

241

bool import_key(const char *filename){

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bool import_key(const char * const filename){

242

273

int ret;

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int fd;

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gpgme_data_t pgp_data;

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282

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

253

284

if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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288

}

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rc = gpgme_op_import(mc.ctx, pgp_data);

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

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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294

return false;

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}

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303

}

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if(debug){

275

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

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

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}

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308

278

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/* Init GPGME */

279

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gpgme_check_version(NULL);

280

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rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

281

312

if(rc != GPG_ERR_NO_ERROR){

282

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

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gpgme_strsource(rc), gpgme_strerror(rc));

313

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

314

gpgme_strsource(rc), gpgme_strerror(rc));

284

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return false;

285

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}

286

317

287

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

288

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rc = gpgme_get_engine_info(&engine_info);

289

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if(rc != GPG_ERR_NO_ERROR){

290

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

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gpgme_strsource(rc), gpgme_strerror(rc));

321

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

322

gpgme_strsource(rc), gpgme_strerror(rc));

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323

return false;

293

324

}

294

325

while(engine_info != NULL){

300

331

engine_info = engine_info->next;

301

332

}

302

333

if(engine_info == NULL){

303

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

334

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

335

tempdir);

304

336

return false;

305

337

}

306

338

307

339

/* Create new GPGME "context" */

308

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

340

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

309

341

if(rc != GPG_ERR_NO_ERROR){

310

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

311

gpgme_strsource(rc), gpgme_strerror(rc));

342

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

343

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

344

gpgme_strerror(rc));

312

345

return false;

313

346

}

314

347

323

356

* Decrypt OpenPGP data.

324

357

* Returns -1 on error

325

358

*/

359

__attribute__((nonnull, warn_unused_result))

326

360

static ssize_t pgp_packet_decrypt(const char *cryptotext,

327

361

size_t crypto_size,

328

char **plaintext){

362

char **plaintext,

363

mandos_context *mc){

329

364

gpgme_data_t dh_crypto, dh_plain;

330

365

gpgme_error_t rc;

331

366

ssize_t ret;

333

368

ssize_t plaintext_length = 0;

334

369

335

370

if(debug){

336

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

371

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

337

372

}

338

373

339

374

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

340

375

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

341

376

0);

342

377

if(rc != GPG_ERR_NO_ERROR){

343

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

344

gpgme_strsource(rc), gpgme_strerror(rc));

378

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

379

gpgme_strsource(rc), gpgme_strerror(rc));

345

380

return -1;

346

381

}

347

382

348

383

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

349

384

rc = gpgme_data_new(&dh_plain);

350

385

if(rc != GPG_ERR_NO_ERROR){

351

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

352

gpgme_strsource(rc), gpgme_strerror(rc));

386

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

387

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

388

gpgme_strsource(rc), gpgme_strerror(rc));

353

389

gpgme_data_release(dh_crypto);

354

390

return -1;

355

391

}

356

392

357

393

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

358

394

data buffer */

359

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

395

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

360

396

if(rc != GPG_ERR_NO_ERROR){

361

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

362

gpgme_strsource(rc), gpgme_strerror(rc));

397

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

398

gpgme_strsource(rc), gpgme_strerror(rc));

363

399

plaintext_length = -1;

364

400

if(debug){

365

401

gpgme_decrypt_result_t result;

366

result = gpgme_op_decrypt_result(mc.ctx);

402

result = gpgme_op_decrypt_result(mc->ctx);

367

403

if(result == NULL){

368

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

404

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

369

405

} else {

370

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

371

result->unsupported_algorithm);

372

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

373

result->wrong_key_usage);

406

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

407

result->unsupported_algorithm);

408

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

409

result->wrong_key_usage);

374

410

if(result->file_name != NULL){

375

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

411

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

376

412

}

377

413

gpgme_recipient_t recipient;

378

414

recipient = result->recipients;

379

415

while(recipient != NULL){

380

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

381

gpgme_pubkey_algo_name(recipient->pubkey_algo));

382

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

383

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

384

recipient->status == GPG_ERR_NO_SECKEY

385

? "No" : "Yes");

416

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

417

gpgme_pubkey_algo_name

418

(recipient->pubkey_algo));

419

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

420

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

421

recipient->status == GPG_ERR_NO_SECKEY

422

? "No" : "Yes");

386

423

recipient = recipient->next;

387

424

}

388

425

}

391

428

}

392

429

393

430

if(debug){

394

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

431

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

395

432

}

396

433

397

434

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

404

441

*plaintext = NULL;

405

442

while(true){

406

443

plaintext_capacity = incbuffer(plaintext,

407

(size_t)plaintext_length,

408

plaintext_capacity);

444

(size_t)plaintext_length,

445

plaintext_capacity);

409

446

if(plaintext_capacity == 0){

410

perror_plus("incbuffer");

411

plaintext_length = -1;

412

goto decrypt_end;

447

perror_plus("incbuffer");

448

plaintext_length = -1;

449

goto decrypt_end;

413

450

}

414

451

415

452

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

428

465

}

429

466

430

467

if(debug){

431

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

468

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

432

469

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

433

470

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

434

471

}

445

482

return plaintext_length;

446

483

}

447

484

448

static const char * safer_gnutls_strerror(int value){

449

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

450

-Wunreachable-code */

485

__attribute__((warn_unused_result))

486

static const char *safer_gnutls_strerror(int value){

487

const char *ret = gnutls_strerror(value);

451

488

if(ret == NULL)

452

489

ret = "(unknown)";

453

490

return ret;

454

491

}

455

492

456

493

/* GnuTLS log function callback */

494

__attribute__((nonnull))

457

495

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

458

496

const char* string){

459

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

497

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

460

498

}

461

499

500

__attribute__((nonnull, warn_unused_result))

462

501

static int init_gnutls_global(const char *pubkeyfilename,

463

const char *seckeyfilename){

502

const char *seckeyfilename,

503

mandos_context *mc){

464

504

int ret;

465

505

466

506

if(debug){

467

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

507

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

468

508

}

469

509

470

510

ret = gnutls_global_init();

471

511

if(ret != GNUTLS_E_SUCCESS){

472

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

473

safer_gnutls_strerror(ret));

512

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

513

safer_gnutls_strerror(ret));

474

514

return -1;

475

515

}

476

516

483

523

}

484

524

485

525

/* OpenPGP credentials */

486

ret = gnutls_certificate_allocate_credentials(&mc.cred);

526

ret = gnutls_certificate_allocate_credentials(&mc->cred);

487

527

if(ret != GNUTLS_E_SUCCESS){

488

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

489

safer_gnutls_strerror(ret));

528

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

529

safer_gnutls_strerror(ret));

490

530

gnutls_global_deinit();

491

531

return -1;

492

532

}

493

533

494

534

if(debug){

495

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

496

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

497

seckeyfilename);

535

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

536

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

537

pubkeyfilename,

538

seckeyfilename);

498

539

}

499

540

500

541

ret = gnutls_certificate_set_openpgp_key_file

501

(mc.cred, pubkeyfilename, seckeyfilename,

542

(mc->cred, pubkeyfilename, seckeyfilename,

502

543

GNUTLS_OPENPGP_FMT_BASE64);

503

544

if(ret != GNUTLS_E_SUCCESS){

504

fprintf(stderr,

505

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

506

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

507

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

508

safer_gnutls_strerror(ret));

545

fprintf_plus(stderr,

546

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

547

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

548

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

549

safer_gnutls_strerror(ret));

509

550

goto globalfail;

510

551

}

511

552

512

553

/* GnuTLS server initialization */

513

ret = gnutls_dh_params_init(&mc.dh_params);

554

ret = gnutls_dh_params_init(&mc->dh_params);

514

555

if(ret != GNUTLS_E_SUCCESS){

515

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

516

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

556

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

557

" initialization: %s\n",

558

safer_gnutls_strerror(ret));

517

559

goto globalfail;

518

560

}

519

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

561

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

520

562

if(ret != GNUTLS_E_SUCCESS){

521

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

522

safer_gnutls_strerror(ret));

563

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

564

safer_gnutls_strerror(ret));

523

565

goto globalfail;

524

566

}

525

567

526

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

568

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

527

569

528

570

return 0;

529

571

530

572

globalfail:

531

573

532

gnutls_certificate_free_credentials(mc.cred);

574

gnutls_certificate_free_credentials(mc->cred);

533

575

gnutls_global_deinit();

534

gnutls_dh_params_deinit(mc.dh_params);

576

gnutls_dh_params_deinit(mc->dh_params);

535

577

return -1;

536

578

}

537

579

538

static int init_gnutls_session(gnutls_session_t *session){

580

__attribute__((nonnull, warn_unused_result))

581

static int init_gnutls_session(gnutls_session_t *session,

582

mandos_context *mc){

539

583

int ret;

540

584

/* GnuTLS session creation */

541

585

do {

545

589

}

546

590

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

547

591

if(ret != GNUTLS_E_SUCCESS){

548

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

549

safer_gnutls_strerror(ret));

592

fprintf_plus(stderr,

593

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

594

safer_gnutls_strerror(ret));

550

595

}

551

596

552

597

{

553

598

const char *err;

554

599

do {

555

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

600

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

556

601

if(quit_now){

557

602

gnutls_deinit(*session);

558

603

return -1;

559

604

}

560

605

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

561

606

if(ret != GNUTLS_E_SUCCESS){

562

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

563

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

564

safer_gnutls_strerror(ret));

607

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

608

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

609

safer_gnutls_strerror(ret));

565

610

gnutls_deinit(*session);

566

611

return -1;

567

612

}

569

614

570

615

do {

571

616

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

572

mc.cred);

617

mc->cred);

573

618

if(quit_now){

574

619

gnutls_deinit(*session);

575

620

return -1;

576

621

}

577

622

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

578

623

if(ret != GNUTLS_E_SUCCESS){

579

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

580

safer_gnutls_strerror(ret));

624

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

625

safer_gnutls_strerror(ret));

581

626

gnutls_deinit(*session);

582

627

return -1;

583

628

}

585

630

/* ignore client certificate if any. */

586

631

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

587

632

588

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

633

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

589

634

590

635

return 0;

591

636

}

595

640

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

596

641

597

642

/* Called when a Mandos server is found */

598

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

643

__attribute__((nonnull, warn_unused_result))

644

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

599

645

AvahiIfIndex if_index,

600

int af){

646

int af, mandos_context *mc){

601

647

int ret, tcp_sd = -1;

602

648

ssize_t sret;

603

union {

604

struct sockaddr_in in;

605

struct sockaddr_in6 in6;

606

} to;

649

struct sockaddr_storage to;

607

650

char *buffer = NULL;

608

651

char *decrypted_buffer = NULL;

609

652

size_t buffer_length = 0;

628

671

pf = PF_INET;

629

672

break;

630

673

default:

631

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

674

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

632

675

errno = EINVAL;

633

676

return -1;

634

677

}

635

678

636

ret = init_gnutls_session(&session);

679

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

680

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

681

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

682

bool match = false;

683

{

684

char *interface = NULL;

685

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

686

interface))){

687

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

688

match = true;

689

break;

690

}

691

}

692

}

693

if(not match){

694

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

695

connect to the server */

696

if(debug){

697

char interface[IF_NAMESIZE];

698

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

699

perror_plus("if_indextoname");

700

} else {

701

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

702

" \"%s\"\n",

703

if_indextoname((unsigned int)if_index,

704

interface));

705

}

706

}

707

return -1;

708

}

709

}

710

711

ret = init_gnutls_session(&session, mc);

637

712

if(ret != 0){

638

713

return -1;

639

714

}

640

715

641

716

if(debug){

642

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

643

"\n", ip, port);

717

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

718

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

644

719

}

645

720

646

721

tcp_sd = socket(pf, SOCK_STREAM, 0);

658

733

659

734

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

660

735

if(af == AF_INET6){

661

to.in6.sin6_family = (sa_family_t)af;

662

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

736

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

737

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

663

738

} else { /* IPv4 */

664

to.in.sin_family = (sa_family_t)af;

665

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

739

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

740

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

666

741

}

667

742

if(ret < 0 ){

668

743

int e = errno;

672

747

}

673

748

if(ret == 0){

674

749

int e = errno;

675

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

750

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

676

751

errno = e;

677

752

goto mandos_end;

678

753

}

679

754

if(af == AF_INET6){

680

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

681

-Wconversion and

682

-Wunreachable-code */

683

684

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

685

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

686

-Wunreachable-code*/

755

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

756

if(IN6_IS_ADDR_LINKLOCAL

757

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

687

758

if(if_index == AVAHI_IF_UNSPEC){

688

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

689

" without a network interface\n");

759

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

760

" incomplete without a network interface\n");

690

761

errno = EINVAL;

691

762

goto mandos_end;

692

763

}

693

764

/* Set the network interface number as scope */

694

to.in6.sin6_scope_id = (uint32_t)if_index;

765

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

695

766

}

696

767

} else {

697

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

698

-Wconversion and

699

-Wunreachable-code */

768

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

700

769

}

701

770

702

771

if(quit_now){

710

779

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

711

780

perror_plus("if_indextoname");

712

781

} else {

713

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

714

ip, interface, port);

782

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

783

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

715

784

}

716

785

} else {

717

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

718

port);

786

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

787

ip, (uintmax_t)port);

719

788

}

720

789

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

721

790

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

722

const char *pcret;

723

791

if(af == AF_INET6){

724

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

725

sizeof(addrstr));

792

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

793

sizeof(struct sockaddr_in6),

794

addrstr, sizeof(addrstr), NULL, 0,

795

NI_NUMERICHOST);

726

796

} else {

727

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

728

sizeof(addrstr));

797

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

798

sizeof(struct sockaddr_in),

799

addrstr, sizeof(addrstr), NULL, 0,

800

NI_NUMERICHOST);

729

801

}

730

if(pcret == NULL){

731

perror_plus("inet_ntop");

732

} else {

733

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

734

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

735

}

802

if(ret == EAI_SYSTEM){

803

perror_plus("getnameinfo");

804

} else if(ret != 0) {

805

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

806

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

807

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

736

808

}

737

809

}

738

810

742

814

}

743

815

744

816

if(af == AF_INET6){

745

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

817

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

818

sizeof(struct sockaddr_in6));

746

819

} else {

747

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

820

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

821

sizeof(struct sockaddr_in));

748

822

}

749

823

if(ret < 0){

750

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

824

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

751

825

int e = errno;

752

826

perror_plus("connect");

753

827

errno = e;

765

839

while(true){

766

840

size_t out_size = strlen(out);

767

841

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

768

out_size - written));

842

out_size - written));

769

843

if(ret == -1){

770

844

int e = errno;

771

845

perror_plus("write");

791

865

}

792

866

793

867

if(debug){

794

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

868

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

795

869

}

796

870

797

871

if(quit_now){

799

873

goto mandos_end;

800

874

}

801

875

802

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

803

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

876

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

877

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

878

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

879

gnutls_transport_set_ptr(session,

880

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

804

881

805

882

if(quit_now){

806

883

errno = EINTR;

817

894

818

895

if(ret != GNUTLS_E_SUCCESS){

819

896

if(debug){

820

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

897

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

821

898

gnutls_perror(ret);

822

899

}

823

900

errno = EPROTO;

827

904

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

828

905

829

906

if(debug){

830

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

831

ip);

907

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

908

" %s\n", ip);

832

909

}

833

910

834

911

while(true){

839

916

}

840

917

841

918

buffer_capacity = incbuffer(&buffer, buffer_length,

842

buffer_capacity);

919

buffer_capacity);

843

920

if(buffer_capacity == 0){

844

921

int e = errno;

845

922

perror_plus("incbuffer");

872

949

}

873

950

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

874

951

if(ret < 0){

875

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

952

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

953

"***\n");

876

954

gnutls_perror(ret);

877

955

errno = EPROTO;

878

956

goto mandos_end;

879

957

}

880

958

break;

881

959

default:

882

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

883

" encrypted session with Mandos server\n");

960

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

961

" encrypted session with Mandos server\n");

884

962

gnutls_bye(session, GNUTLS_SHUT_RDWR);

885

963

errno = EIO;

886

964

goto mandos_end;

891

969

}

892

970

893

971

if(debug){

894

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

972

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

895

973

}

896

974

897

975

if(quit_now){

909

987

910

988

if(buffer_length > 0){

911

989

ssize_t decrypted_buffer_size;

912

decrypted_buffer_size = pgp_packet_decrypt(buffer,

913

buffer_length,

914

&decrypted_buffer);

990

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

991

&decrypted_buffer, mc);

915

992

if(decrypted_buffer_size >= 0){

916

993

917

994

written = 0;

927

1004

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

928

1005

int e = errno;

929

1006

if(debug){

930

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

931

strerror(errno));

1007

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

1008

strerror(errno));

932

1009

}

933

1010

errno = e;

934

1011

goto mandos_end;

965

1042

return retval;

966

1043

}

967

1044

1045

__attribute__((nonnull))

968

1046

static void resolve_callback(AvahiSServiceResolver *r,

969

1047

AvahiIfIndex interface,

970

1048

AvahiProtocol proto,

978

1056

AVAHI_GCC_UNUSED AvahiStringList *txt,

979

1057

AVAHI_GCC_UNUSED AvahiLookupResultFlags

980

1058

flags,

981

AVAHI_GCC_UNUSED void* userdata){

982

assert(r);

1059

void *mc){

1060

if(r == NULL){

1061

return;

1062

}

983

1063

984

1064

/* Called whenever a service has been resolved successfully or

985

1065

timed out */

991

1071

switch(event){

992

1072

default:

993

1073

case AVAHI_RESOLVER_FAILURE:

994

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

995

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

996

avahi_strerror(avahi_server_errno(mc.server)));

1074

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

1075

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

1076

domain,

1077

avahi_strerror(avahi_server_errno

1078

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

997

1079

break;

998

1080

999

1081

case AVAHI_RESOLVER_FOUND:

1001

1083

char ip[AVAHI_ADDRESS_STR_MAX];

1002

1084

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

1003

1085

if(debug){

1004

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

1005

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

1006

ip, (intmax_t)interface, port);

1086

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

1087

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

1088

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

1007

1089

}

1008

int ret = start_mandos_communication(ip, port, interface,

1009

avahi_proto_to_af(proto));

1090

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

1091

interface,

1092

avahi_proto_to_af(proto),

1093

mc);

1010

1094

if(ret == 0){

1011

avahi_simple_poll_quit(mc.simple_poll);

1095

avahi_simple_poll_quit(simple_poll);

1012

1096

} else {

1013

ret = add_server(ip, port, interface,

1014

avahi_proto_to_af(proto));

1097

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

1098

avahi_proto_to_af(proto),

1099

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

1100

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

1101

" list\n", name);

1102

}

1015

1103

}

1016

1104

}

1017

1105

}

1027

1115

const char *domain,

1028

1116

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1029

1117

flags,

1030

AVAHI_GCC_UNUSED void* userdata){

1031

assert(b);

1118

void *mc){

1119

if(b == NULL){

1120

return;

1121

}

1032

1122

1033

1123

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

1034

1124

is removed from the LAN */

1041

1131

default:

1042

1132

case AVAHI_BROWSER_FAILURE:

1043

1133

1044

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

1045

avahi_strerror(avahi_server_errno(mc.server)));

1046

avahi_simple_poll_quit(mc.simple_poll);

1134

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

1135

avahi_strerror(avahi_server_errno

1136

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

1137

avahi_simple_poll_quit(simple_poll);

1047

1138

return;

1048

1139

1049

1140

case AVAHI_BROWSER_NEW:

1052

1143

the callback function is called the Avahi server will free the

1053

1144

resolver for us. */

1054

1145

1055

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

1056

name, type, domain, protocol, 0,

1057

resolve_callback, NULL) == NULL)

1058

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

1059

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

1146

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

1147

interface, protocol, name, type,

1148

domain, protocol, 0,

1149

resolve_callback, mc) == NULL)

1150

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

1151

" %s\n", name,

1152

avahi_strerror(avahi_server_errno

1153

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

1060

1154

break;

1061

1155

1062

1156

case AVAHI_BROWSER_REMOVE:

1065

1159

case AVAHI_BROWSER_ALL_FOR_NOW:

1066

1160

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1067

1161

if(debug){

1068

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

1162

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

1163

" searching...\n");

1069

1164

}

1070

1165

break;

1071

1166

}

1080

1175

signal_received = sig;

1081

1176

int old_errno = errno;

1082

1177

/* set main loop to exit */

1083

if(mc.simple_poll != NULL){

1084

avahi_simple_poll_quit(mc.simple_poll);

1178

if(simple_poll != NULL){

1179

avahi_simple_poll_quit(simple_poll);

1085

1180

}

1086

1181

errno = old_errno;

1087

1182

}

1088

1183

1184

__attribute__((nonnull, warn_unused_result))

1089

1185

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

1090

1186

int ret;

1187

error_t ret_errno;

1091

1188

1092

1189

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

1093

1190

if(s < 0){

1191

ret_errno = errno;

1094

1192

perror_plus("socket");

1193

errno = ret_errno;

1095

1194

return false;

1096

1195

}

1097

1196

strcpy(ifr->ifr_name, ifname);

1098

1197

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1099

1198

if(ret == -1){

1100

1199

if(debug){

1200

ret_errno = errno;

1101

1201

perror_plus("ioctl SIOCGIFFLAGS");

1202

errno = ret_errno;

1102

1203

}

1103

1204

return false;

1104

1205

}

1105

1206

return true;

1106

1207

}

1107

1208

1209

__attribute__((nonnull, warn_unused_result))

1108

1210

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

1109

1211

1110

1212

/* Reject the loopback device */

1111

1213

if(ifr->ifr_flags & IFF_LOOPBACK){

1112

1214

if(debug){

1113

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

1114

ifname);

1215

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

1216

ifname);

1115

1217

}

1116

1218

return false;

1117

1219

}

1118

1220

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

1119

1221

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

1120

1222

if(debug){

1121

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

1122

ifname);

1223

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

1224

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

1123

1225

}

1124

1226

return true;

1125

1227

}

1126

1228

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

1127

1229

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

1128

1230

if(debug){

1129

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

1130

ifname);

1231

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1232

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

1131

1233

}

1132

1234

return false;

1133

1235

}

1134

1236

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

1135

1237

if(ifr->ifr_flags & IFF_NOARP){

1136

1238

if(debug){

1137

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

1239

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

1240

ifname);

1138

1241

}

1139

1242

return false;

1140

1243

}

1141

1244

1142

1245

/* Accept this device */

1143

1246

if(debug){

1144

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

1247

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

1145

1248

}

1146

1249

return true;

1147

1250

}

1151

1254

* corresponds to an acceptable network device.

1152

1255

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

1153

1256

*/

1257

__attribute__((nonnull, warn_unused_result))

1154

1258

int good_interface(const struct dirent *if_entry){

1155

int ret;

1156

1259

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

1157

1260

return 0;

1158

1261

}

1262

1159

1263

struct ifreq ifr;

1160

1161

1264

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

1265

if(debug){

1266

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

1267

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

1268

}

1162

1269

return 0;

1163

1270

}

1164

1271

1169

1276

}

1170

1277

1171

1278

/*

1172

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

1173

* corresponds to an acceptable network device which is up.

1174

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

1175

*/

1176

int up_interface(const struct dirent *if_entry){

1177

ssize_t ssret;

1178

char *flagname = NULL;

1179

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

1180

return 0;

1181

}

1182

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

1183

if_entry->d_name);

1184

if(ret < 0){

1185

perror_plus("asprintf");

1186

return 0;

1187

}

1188

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

1189

if(flags_fd == -1){

1190

perror_plus("open");

1191

free(flagname);

1192

return 0;

1193

}

1194

free(flagname);

1195

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

1196

/* read line from flags_fd */

1197

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

1198

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

1199

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

1200

if(flagstring == NULL){

1201

perror_plus("malloc");

1202

close(flags_fd);

1203

return 0;

1204

}

1205

while(to_read > 0){

1206

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

1207

(size_t)to_read));

1208

if(ssret == -1){

1209

perror_plus("read");

1210

free(flagstring);

1211

close(flags_fd);

1212

return 0;

1213

}

1214

to_read -= ssret;

1215

if(ssret == 0){

1216

break;

1217

}

1218

}

1219

close(flags_fd);

1220

intmax_t tmpmax;

1221

char *tmp;

1222

errno = 0;

1223

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

1224

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

1225

and not (isspace(*tmp)))

1226

or tmpmax != (ifreq_flags)tmpmax){

1227

if(debug){

1228

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

1229

flagstring, if_entry->d_name);

1230

}

1231

free(flagstring);

1232

return 0;

1233

}

1234

free(flagstring);

1235

ifreq_flags flags = (ifreq_flags)tmpmax;

1236

/* Reject the loopback device */

1237

if(flags & IFF_LOOPBACK){

1238

if(debug){

1239

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

1240

if_entry->d_name);

1241

}

1242

return 0;

1243

}

1244

1245

/* Reject down interfaces */

1246

if(not (flags & IFF_UP)){

1247

return 0;

1248

}

1249

1250

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

1251

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

1252

if(debug){

1253

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

1254

if_entry->d_name);

1255

}

1256

return 1;

1257

}

1258

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

1259

if(not (flags & IFF_BROADCAST)){

1260

if(debug){

1261

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

1262

if_entry->d_name);

1263

}

1264

return 0;

1265

}

1266

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

1267

if(flags & IFF_NOARP){

1268

if(debug){

1269

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

1270

if_entry->d_name);

1271

}

1272

return 0;

1273

}

1274

/* Accept this device */

1275

if(debug){

1276

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

1277

if_entry->d_name);

1278

}

1279

return 1;

1280

}

1281

1279

* This function determines if a network interface is up.

1280

*/

1281

__attribute__((nonnull, warn_unused_result))

1282

bool interface_is_up(const char *interface){

1283

struct ifreq ifr;

1284

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

1285

if(debug){

1286

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

1287

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

1288

}

1289

return false;

1290

}

1291

1292

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

1293

}

1294

1295

/*

1296

* This function determines if a network interface is running

1297

*/

1298

__attribute__((nonnull, warn_unused_result))

1299

bool interface_is_running(const char *interface){

1300

struct ifreq ifr;

1301

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

1302

if(debug){

1303

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

1304

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

1305

}

1306

return false;

1307

}

1308

1309

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

1310

}

1311

1312

__attribute__((nonnull, pure, warn_unused_result))

1282

1313

int notdotentries(const struct dirent *direntry){

1283

1314

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

1284

1315

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

1291

1322

}

1292

1323

1293

1324

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

1325

__attribute__((nonnull, warn_unused_result))

1294

1326

int runnable_hook(const struct dirent *direntry){

1295

1327

int ret;

1328

size_t sret;

1296

1329

struct stat st;

1297

1330

1298

1331

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

1300

1333

return 0;

1301

1334

}

1302

1335

1303

/* Save pointer to last character */

1304

char *end = strchr(direntry->d_name, '\0')-1;

1305

1306

if(*end == '~'){

1307

/* Backup name~ */

1308

return 0;

1309

}

1310

1311

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

1312

and (*end == '#')){

1313

/* Temporary #name# */

1314

return 0;

1315

}

1316

1317

/* XXX more rules here */

1318

1319

ret = stat(direntry->d_name, &st);

1336

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

1337

"abcdefghijklmnopqrstuvwxyz"

1338

"0123456789"

1339

"_.-");

1340

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

1341

/* Contains non-allowed characters */

1342

if(debug){

1343

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

1344

direntry->d_name);

1345

}

1346

return 0;

1347

}

1348

1349

char *fullname = NULL;

1350

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

1351

if(ret < 0){

1352

perror_plus("asprintf");

1353

return 0;

1354

}

1355

1356

ret = stat(fullname, &st);

1320

1357

if(ret == -1){

1321

1358

if(debug){

1322

perror_plus("Could not stat plugin");

1359

perror_plus("Could not stat hook");

1323

1360

}

1324

1361

return 0;

1325

1362

}

1326

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

1363

free(fullname);

1364

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

1327

1365

/* Not a regular file */

1366

if(debug){

1367

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

1368

direntry->d_name);

1369

}

1328

1370

return 0;

1329

1371

}

1330

1372

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

1331

1373

/* Not executable */

1374

if(debug){

1375

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

1376

direntry->d_name);

1377

}

1332

1378

return 0;

1333

1379

}

1380

if(debug){

1381

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

1382

direntry->d_name);

1383

}

1334

1384

return 1;

1335

1385

}

1336

1386

1337

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1387

__attribute__((nonnull, warn_unused_result))

1388

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1389

mandos_context *mc){

1338

1390

int ret;

1339

1391

struct timespec now;

1340

1392

struct timespec waited_time;

1341

1393

intmax_t block_time;

1342

1394

1343

1395

while(true){

1344

if(mc.current_server == NULL){

1345

if (debug){

1346

fprintf(stderr,

1347

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

1396

if(mc->current_server == NULL){

1397

if(debug){

1398

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

1399

" No timeout!\n");

1348

1400

}

1349

1401

ret = avahi_simple_poll_iterate(s, -1);

1350

1402

} else {

1351

if (debug){

1352

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

1353

" or wait\n");

1403

if(debug){

1404

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

1405

" it, or wait\n");

1354

1406

}

1355

1407

/* the current time */

1356

1408

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1361

1413

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

1362

1414

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

1363

1415

waited_time.tv_sec = (now.tv_sec

1364

- mc.current_server->last_seen.tv_sec);

1416

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

1365

1417

waited_time.tv_nsec = (now.tv_nsec

1366

- mc.current_server->last_seen.tv_nsec);

1418

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

1367

1419

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

1368

1420

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

1369

1421

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

1371

1423

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

1372

1424

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

1373

1425

1374

if (debug){

1375

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

1426

if(debug){

1427

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

1428

block_time);

1376

1429

}

1377

1430

1378

1431

if(block_time <= 0){

1379

ret = start_mandos_communication(mc.current_server->ip,

1380

mc.current_server->port,

1381

mc.current_server->if_index,

1382

mc.current_server->af);

1432

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

1433

mc->current_server->port,

1434

mc->current_server->if_index,

1435

mc->current_server->af, mc);

1383

1436

if(ret == 0){

1384

avahi_simple_poll_quit(mc.simple_poll);

1437

avahi_simple_poll_quit(s);

1385

1438

return 0;

1386

1439

}

1387

1440

ret = clock_gettime(CLOCK_MONOTONIC,

1388

&mc.current_server->last_seen);

1441

&mc->current_server->last_seen);

1389

1442

if(ret == -1){

1390

1443

perror_plus("clock_gettime");

1391

1444

return -1;

1392

1445

}

1393

mc.current_server = mc.current_server->next;

1446

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

1394

1447

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

1395

1448

servers, but don't block */

1396

1449

}

1398

1451

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

1399

1452

}

1400

1453

if(ret != 0){

1401

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

1454

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

1402

1455

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

1403

1456

}

1404

1457

}

1405

1458

}

1406

1459

}

1407

1460

1461

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

1462

__attribute__((warn_unused_result))

1463

error_t raise_privileges(void){

1464

error_t old_errno = errno;

1465

error_t ret_errno = 0;

1466

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

1467

ret_errno = errno;

1468

perror_plus("seteuid");

1469

}

1470

errno = old_errno;

1471

return ret_errno;

1472

}

1473

1474

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

1475

__attribute__((warn_unused_result))

1476

error_t raise_privileges_permanently(void){

1477

error_t old_errno = errno;

1478

error_t ret_errno = raise_privileges();

1479

if(ret_errno != 0){

1480

errno = old_errno;

1481

return ret_errno;

1482

}

1483

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

1484

ret_errno = errno;

1485

perror_plus("seteuid");

1486

}

1487

errno = old_errno;

1488

return ret_errno;

1489

}

1490

1491

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

1492

__attribute__((warn_unused_result))

1493

error_t lower_privileges(void){

1494

error_t old_errno = errno;

1495

error_t ret_errno = 0;

1496

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

1497

ret_errno = errno;

1498

perror_plus("seteuid");

1499

}

1500

errno = old_errno;

1501

return ret_errno;

1502

}

1503

1504

/* Lower privileges permanently */

1505

__attribute__((warn_unused_result))

1506

error_t lower_privileges_permanently(void){

1507

error_t old_errno = errno;

1508

error_t ret_errno = 0;

1509

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

1510

ret_errno = errno;

1511

perror_plus("setuid");

1512

}

1513

errno = old_errno;

1514

return ret_errno;

1515

}

1516

1517

#ifndef O_CLOEXEC

1518

/*

1519

* Based on the example in the GNU LibC manual chapter 13.13 "File

1520

* Descriptor Flags".

1521

| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |

1522

*/

1523

__attribute__((warn_unused_result))

1524

static int set_cloexec_flag(int fd){

1525

int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));

1526

/* If reading the flags failed, return error indication now. */

1527

if(ret < 0){

1528

return ret;

1529

}

1530

/* Store modified flag word in the descriptor. */

1531

return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,

1532

ret | FD_CLOEXEC));

1533

}

1534

#endif /* not O_CLOEXEC */

1535

1536

__attribute__((nonnull))

1537

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

1538

const float delay){

1539

struct dirent **direntries;

1540

if(hookdir_fd == -1){

1541

hookdir_fd = open(hookdir, O_RDONLY |

1542

#ifdef O_CLOEXEC

1543

O_CLOEXEC

1544

#else /* not O_CLOEXEC */

1545

0

1546

#endif /* not O_CLOEXEC */

1547

);

1548

if(hookdir_fd == -1){

1549

if(errno == ENOENT){

1550

if(debug){

1551

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

1552

" found\n", hookdir);

1553

}

1554

} else {

1555

perror_plus("open");

1556

}

1557

return;

1558

}

1559

#ifndef O_CLOEXEC

1560

if(set_cloexec_flag(hookdir_fd) < 0){

1561

perror_plus("set_cloexec_flag");

1562

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

1563

perror_plus("close");

1564

} else {

1565

hookdir_fd = -1;

1566

}

1567

return;

1568

}

1569

#endif /* not O_CLOEXEC */

1570

}

1571

#ifdef __GLIBC__

1572

#if __GLIBC_PREREQ(2, 15)

1573

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

1574

runnable_hook, alphasort);

1575

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

1576

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

1577

alphasort);

1578

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

1579

#else /* not __GLIBC__ */

1580

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

1581

alphasort);

1582

#endif /* not __GLIBC__ */

1583

if(numhooks == -1){

1584

perror_plus("scandir");

1585

return;

1586

}

1587

struct dirent *direntry;

1588

int ret;

1589

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

1590

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

1591

direntry = direntries[i];

1592

if(debug){

1593

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

1594

direntry->d_name);

1595

}

1596

pid_t hook_pid = fork();

1597

if(hook_pid == 0){

1598

/* Child */

1599

/* Raise privileges */

1600

if(raise_privileges_permanently() != 0){

1601

perror_plus("Failed to raise privileges");

1602

_exit(EX_NOPERM);

1603

}

1604

/* Set group */

1605

errno = 0;

1606

ret = setgid(0);

1607

if(ret == -1){

1608

perror_plus("setgid");

1609

_exit(EX_NOPERM);

1610

}

1611

/* Reset supplementary groups */

1612

errno = 0;

1613

ret = setgroups(0, NULL);

1614

if(ret == -1){

1615

perror_plus("setgroups");

1616

_exit(EX_NOPERM);

1617

}

1618

ret = dup2(devnull, STDIN_FILENO);

1619

if(ret == -1){

1620

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

1621

_exit(EX_OSERR);

1622

}

1623

ret = close(devnull);

1624

if(ret == -1){

1625

perror_plus("close");

1626

_exit(EX_OSERR);

1627

}

1628

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1629

if(ret == -1){

1630

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

1631

_exit(EX_OSERR);

1632

}

1633

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

1634

if(ret == -1){

1635

perror_plus("setenv");

1636

_exit(EX_OSERR);

1637

}

1638

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

1639

if(ret == -1){

1640

perror_plus("setenv");

1641

_exit(EX_OSERR);

1642

}

1643

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

1644

if(ret == -1){

1645

perror_plus("setenv");

1646

_exit(EX_OSERR);

1647

}

1648

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

1649

if(ret == -1){

1650

perror_plus("setenv");

1651

_exit(EX_OSERR);

1652

}

1653

char *delaystring;

1654

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

1655

if(ret == -1){

1656

perror_plus("asprintf");

1657

_exit(EX_OSERR);

1658

}

1659

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

1660

if(ret == -1){

1661

free(delaystring);

1662

perror_plus("setenv");

1663

_exit(EX_OSERR);

1664

}

1665

free(delaystring);

1666

if(connect_to != NULL){

1667

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

1668

if(ret == -1){

1669

perror_plus("setenv");

1670

_exit(EX_OSERR);

1671

}

1672

}

1673

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

1674

{ direntry->d_name, NULL }, environ) == -1){

1675

perror_plus("fexecve");

1676

_exit(EXIT_FAILURE);

1677

}

1678

} else {

1679

int status;

1680

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

1681

perror_plus("waitpid");

1682

continue;

1683

}

1684

if(WIFEXITED(status)){

1685

if(WEXITSTATUS(status) != 0){

1686

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

1687

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

1688

WEXITSTATUS(status));

1689

continue;

1690

}

1691

} else if(WIFSIGNALED(status)){

1692

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

1693

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

1694

WTERMSIG(status));

1695

continue;

1696

} else {

1697

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

1698

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

1699

continue;

1700

}

1701

}

1702

if(debug){

1703

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

1704

direntry->d_name);

1705

}

1706

}

1707

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

1708

perror_plus("close");

1709

} else {

1710

hookdir_fd = -1;

1711

}

1712

close(devnull);

1713

}

1714

1715

__attribute__((nonnull, warn_unused_result))

1716

error_t bring_up_interface(const char *const interface,

1717

const float delay){

1718

error_t old_errno = errno;

1719

int ret;

1720

struct ifreq network;

1721

unsigned int if_index = if_nametoindex(interface);

1722

if(if_index == 0){

1723

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

1724

errno = old_errno;

1725

return ENXIO;

1726

}

1727

1728

if(quit_now){

1729

errno = old_errno;

1730

return EINTR;

1731

}

1732

1733

if(not interface_is_up(interface)){

1734

error_t ret_errno = 0, ioctl_errno = 0;

1735

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

1736

ret_errno = errno;

1737

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

1738

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

1739

errno = old_errno;

1740

return ret_errno;

1741

}

1742

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

1743

1744

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

1745

if(sd == -1){

1746

ret_errno = errno;

1747

perror_plus("socket");

1748

errno = old_errno;

1749

return ret_errno;

1750

}

1751

1752

if(quit_now){

1753

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

1754

if(ret == -1){

1755

perror_plus("close");

1756

}

1757

errno = old_errno;

1758

return EINTR;

1759

}

1760

1761

if(debug){

1762

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

1763

interface);

1764

}

1765

1766

/* Raise privileges */

1767

ret_errno = raise_privileges();

1768

if(ret_errno != 0){

1769

perror_plus("Failed to raise privileges");

1770

}

1771

1772

#ifdef __linux__

1773

int ret_linux;

1774

bool restore_loglevel = false;

1775

if(ret_errno == 0){

1776

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1777

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

1778

ret_linux = klogctl(8, NULL, 5);

1779

if(ret_linux == -1){

1780

perror_plus("klogctl");

1781

} else {

1782

restore_loglevel = true;

1783

}

1784

}

1785

#endif /* __linux__ */

1786

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

1787

ioctl_errno = errno;

1788

#ifdef __linux__

1789

if(restore_loglevel){

1790

ret_linux = klogctl(7, NULL, 0);

1791

if(ret_linux == -1){

1792

perror_plus("klogctl");

1793

}

1794

}

1795

#endif /* __linux__ */

1796

1797

/* If raise_privileges() succeeded above */

1798

if(ret_errno == 0){

1799

/* Lower privileges */

1800

ret_errno = lower_privileges();

1801

if(ret_errno != 0){

1802

errno = ret_errno;

1803

perror_plus("Failed to lower privileges");

1804

}

1805

}

1806

1807

/* Close the socket */

1808

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

1809

if(ret == -1){

1810

perror_plus("close");

1811

}

1812

1813

if(ret_setflags == -1){

1814

errno = ioctl_errno;

1815

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1816

errno = old_errno;

1817

return ioctl_errno;

1818

}

1819

} else if(debug){

1820

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

1821

interface);

1822

}

1823

1824

/* Sleep checking until interface is running.

1825

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

1826

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

1827

if(interface_is_running(interface)){

1828

break;

1829

}

1830

struct timespec sleeptime = { .tv_nsec = 250000000 };

1831

ret = nanosleep(&sleeptime, NULL);

1832

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

1833

perror_plus("nanosleep");

1834

}

1835

}

1836

1837

errno = old_errno;

1838

return 0;

1839

}

1840

1841

__attribute__((nonnull, warn_unused_result))

1842

error_t take_down_interface(const char *const interface){

1843

error_t old_errno = errno;

1844

struct ifreq network;

1845

unsigned int if_index = if_nametoindex(interface);

1846

if(if_index == 0){

1847

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

1848

errno = old_errno;

1849

return ENXIO;

1850

}

1851

if(interface_is_up(interface)){

1852

error_t ret_errno = 0, ioctl_errno = 0;

1853

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

1854

ret_errno = errno;

1855

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

1856

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

1857

errno = old_errno;

1858

return ret_errno;

1859

}

1860

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

1861

1862

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

1863

if(sd == -1){

1864

ret_errno = errno;

1865

perror_plus("socket");

1866

errno = old_errno;

1867

return ret_errno;

1868

}

1869

1870

if(debug){

1871

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

1872

interface);

1873

}

1874

1875

/* Raise privileges */

1876

ret_errno = raise_privileges();

1877

if(ret_errno != 0){

1878

perror_plus("Failed to raise privileges");

1879

}

1880

1881

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

1882

ioctl_errno = errno;

1883

1884

/* If raise_privileges() succeeded above */

1885

if(ret_errno == 0){

1886

/* Lower privileges */

1887

ret_errno = lower_privileges();

1888

if(ret_errno != 0){

1889

errno = ret_errno;

1890

perror_plus("Failed to lower privileges");

1891

}

1892

}

1893

1894

/* Close the socket */

1895

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

1896

if(ret == -1){

1897

perror_plus("close");

1898

}

1899

1900

if(ret_setflags == -1){

1901

errno = ioctl_errno;

1902

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1903

errno = old_errno;

1904

return ioctl_errno;

1905

}

1906

} else if(debug){

1907

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

1908

interface);

1909

}

1910

1911

errno = old_errno;

1912

return 0;

1913

}

1914

1408

1915

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

1916

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

1917

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

1918

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

1919

.interfaces = NULL, .interfaces_size = 0 };

1409

1920

AvahiSServiceBrowser *sb = NULL;

1410

int error;

1921

error_t ret_errno;

1411

1922

int ret;

1412

1923

intmax_t tmpmax;

1413

1924

char *tmp;

1414

1925

int exitcode = EXIT_SUCCESS;

1415

const char *interface = "";

1416

struct ifreq network;

1417

int sd = -1;

1418

bool take_down_interface = false;

1419

uid_t uid;

1420

gid_t gid;

1421

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

1422

bool tempdir_created = false;

1926

char *interfaces_to_take_down = NULL;

1927

size_t interfaces_to_take_down_size = 0;

1928

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

1929

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

1930

char *tempdir = NULL;

1423

1931

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1424

1932

const char *seckey = PATHDIR "/" SECKEY;

1425

1933

const char *pubkey = PATHDIR "/" PUBKEY;

1934

char *interfaces_hooks = NULL;

1426

1935

1427

1936

bool gnutls_initialized = false;

1428

1937

bool gpgme_initialized = false;

1490

1999

.group = 2 },

1491

2000

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

1492

2001

.arg = "SECONDS",

1493

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

2002

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

2003

.group = 2 },

2004

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

2005

.arg = "DIR",

2006

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

1494

2007

.group = 2 },

1495

2008

/*

1496

2009

* These reproduce what we would get without ARGP_NO_HELP

1515

2028

connect_to = arg;

1516

2029

break;

1517

2030

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

1518

interface = arg;

2031

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

2032

arg, (int)',');

2033

if(ret_errno != 0){

2034

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

2035

}

1519

2036

break;

1520

2037

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

1521

2038

seckey = arg;

1550

2067

argp_error(state, "Bad retry interval");

1551

2068

}

1552

2069

break;

2070

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

2071

hookdir = arg;

2072

break;

1553

2073

/*

1554

2074

* These reproduce what we would get without ARGP_NO_HELP

1555

2075

*/

1561

2081

argp_state_help(state, state->out_stream,

1562

2082

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1563

2083

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

1564

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

2084

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

1565

2085

exit(argp_err_exit_status);

1566

2086

break;

1567

2087

default:

1594

2114

{

1595

2115

/* Work around Debian bug #633582:

1596

2116

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

1597

struct stat st;

1598

1599

/* Re-raise priviliges */

1600

errno = 0;

1601

ret = seteuid(0);

1602

if(ret == -1){

1603

perror_plus("seteuid");

1604

}

1605

1606

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

1607

int seckey_fd = open(seckey, O_RDONLY);

1608

if(seckey_fd == -1){

1609

perror_plus("open");

1610

} else {

1611

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

1612

if(ret == -1){

1613

perror_plus("fstat");

1614

} else {

1615

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

1616

ret = fchown(seckey_fd, uid, gid);

1617

if(ret == -1){

1618

perror_plus("fchown");

1619

}

1620

}

1621

}

1622

TEMP_FAILURE_RETRY(close(seckey_fd));

1623

}

1624

}

1625

1626

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

1627

int pubkey_fd = open(pubkey, O_RDONLY);

1628

if(pubkey_fd == -1){

1629

perror_plus("open");

1630

} else {

1631

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

1632

if(ret == -1){

1633

perror_plus("fstat");

1634

} else {

1635

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

1636

ret = fchown(pubkey_fd, uid, gid);

1637

if(ret == -1){

1638

perror_plus("fchown");

1639

}

1640

}

1641

}

1642

TEMP_FAILURE_RETRY(close(pubkey_fd));

1643

}

1644

}

1645

1646

/* Lower privileges */

1647

errno = 0;

1648

ret = seteuid(uid);

1649

if(ret == -1){

1650

perror_plus("seteuid");

1651

}

1652

}

1653

1654

/* Find network hooks and run them */

1655

{

1656

struct dirent **direntries;

1657

struct dirent *direntry;

1658

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

1659

alphasort);

1660

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

1661

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

1662

direntry = direntries[0];

1663

char *fullname = NULL;

1664

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

1665

direntry->d_name);

1666

if(ret < 0){

1667

perror_plus("asprintf");

1668

continue;

1669

}

1670

pid_t hook_pid = fork();

1671

if(hook_pid == 0){

1672

/* Child */

1673

dup2(devnull, STDIN_FILENO);

1674

close(devnull);

1675

dup2(STDERR_FILENO, STDOUT_FILENO);

1676

setenv("DEVICE", interface, 1);

1677

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

1678

setenv("MODE", "start", 1);

1679

/* setenv( XXX more here */

1680

ret = execl(fullname, direntry->d_name, "start");

1681

perror_plus("execl");

1682

}

1683

free(fullname);

1684

if(quit_now){

2117

2118

/* Re-raise privileges */

2119

ret_errno = raise_privileges();

2120

if(ret_errno != 0){

2121

errno = ret_errno;

2122

perror_plus("Failed to raise privileges");

2123

} else {

2124

struct stat st;

2125

2126

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

2127

int seckey_fd = open(seckey, O_RDONLY);

2128

if(seckey_fd == -1){

2129

perror_plus("open");

2130

} else {

2131

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

2132

if(ret == -1){

2133

perror_plus("fstat");

2134

} else {

2135

if(S_ISREG(st.st_mode)

2136

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

2137

ret = fchown(seckey_fd, uid, gid);

2138

if(ret == -1){

2139

perror_plus("fchown");

2140

}

2141

}

2142

}

2143

TEMP_FAILURE_RETRY(close(seckey_fd));

2144

}

2145

}

2146

2147

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

2148

int pubkey_fd = open(pubkey, O_RDONLY);

2149

if(pubkey_fd == -1){

2150

perror_plus("open");

2151

} else {

2152

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

2153

if(ret == -1){

2154

perror_plus("fstat");

2155

} else {

2156

if(S_ISREG(st.st_mode)

2157

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

2158

ret = fchown(pubkey_fd, uid, gid);

2159

if(ret == -1){

2160

perror_plus("fchown");

2161

}

2162

}

2163

}

2164

TEMP_FAILURE_RETRY(close(pubkey_fd));

2165

}

2166

}

2167

2168

/* Lower privileges */

2169

ret_errno = lower_privileges();

2170

if(ret_errno != 0){

2171

errno = ret_errno;

2172

perror_plus("Failed to lower privileges");

2173

}

2174

}

2175

}

2176

2177

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

2178

{

2179

char *interface = NULL;

2180

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

2181

interface))){

2182

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

2183

and if_nametoindex(interface) == 0){

2184

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

2185

fprintf_plus(stderr, "Not using nonexisting interface"

2186

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

2187

}

2188

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

2189

interface = NULL;

2190

}

2191

}

2192

}

2193

2194

/* Run network hooks */

2195

{

2196

if(mc.interfaces != NULL){

2197

interfaces_hooks = malloc(mc.interfaces_size);

2198

if(interfaces_hooks == NULL){

2199

perror_plus("malloc");

1685

2200

goto end;

1686

2201

}

2202

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

2203

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

1687

2204

}

1688

close(devnull);

2205

run_network_hooks("start", interfaces_hooks != NULL ?

2206

interfaces_hooks : "", delay);

1689

2207

}

1690

2208

1691

2209

if(not debug){

1692

2210

avahi_set_log_function(empty_log);

1693

2211

}

1694

2212

1695

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

1696

struct dirent **direntries;

1697

ret = scandir(sys_class_net, &direntries, good_interface,

1698

alphasort);

1699

if(ret >= 1){

1700

/* Pick the first good interface */

1701

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

1702

if(debug){

1703

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

1704

}

1705

if(interface == NULL){

1706

perror_plus("malloc");

1707

free(direntries);

1708

exitcode = EXIT_FAILURE;

1709

goto end;

1710

}

1711

free(direntries);

1712

} else {

1713

free(direntries);

1714

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

1715

exitcode = EXIT_FAILURE;

1716

goto end;

1717

}

1718

}

1719

1720

2213

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

1721

2214

from the signal handler */

1722

2215

/* Initialize the pseudo-RNG for Avahi */

1723

2216

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

1724

mc.simple_poll = avahi_simple_poll_new();

1725

if(mc.simple_poll == NULL){

1726

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

2217

simple_poll = avahi_simple_poll_new();

2218

if(simple_poll == NULL){

2219

fprintf_plus(stderr,

2220

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

1727

2221

exitcode = EX_UNAVAILABLE;

1728

2222

goto end;

1729

2223

}

1791

2285

}

1792

2286

}

1793

2287

1794

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

1795

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

1796

if_index = (AvahiIfIndex) if_nametoindex(interface);

1797

if(if_index == 0){

1798

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

1799

exitcode = EX_UNAVAILABLE;

1800

goto end;

1801

}

1802

1803

if(quit_now){

1804

goto end;

1805

}

1806

1807

/* Re-raise priviliges */

1808

errno = 0;

1809

ret = seteuid(0);

1810

if(ret == -1){

1811

perror_plus("seteuid");

1812

}

1813

1814

#ifdef __linux__

1815

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1816

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

1817

ret = klogctl(8, NULL, 5);

1818

bool restore_loglevel = true;

1819

if(ret == -1){

1820

restore_loglevel = false;

1821

perror_plus("klogctl");

1822

}

1823

#endif /* __linux__ */

1824

1825

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1826

if(sd < 0){

1827

perror_plus("socket");

1828

exitcode = EX_OSERR;

1829

#ifdef __linux__

1830

if(restore_loglevel){

1831

ret = klogctl(7, NULL, 0);

1832

if(ret == -1){

1833

perror_plus("klogctl");

1834

}

1835

}

1836

#endif /* __linux__ */

1837

/* Lower privileges */

1838

errno = 0;

1839

ret = seteuid(uid);

1840

if(ret == -1){

1841

perror_plus("seteuid");

1842

}

1843

goto end;

1844

}

1845

strcpy(network.ifr_name, interface);

1846

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

1847

if(ret == -1){

1848

perror_plus("ioctl SIOCGIFFLAGS");

1849

#ifdef __linux__

1850

if(restore_loglevel){

1851

ret = klogctl(7, NULL, 0);

1852

if(ret == -1){

1853

perror_plus("klogctl");

1854

}

1855

}

1856

#endif /* __linux__ */

1857

exitcode = EX_OSERR;

1858

/* Lower privileges */

1859

errno = 0;

1860

ret = seteuid(uid);

1861

if(ret == -1){

1862

perror_plus("seteuid");

1863

}

1864

goto end;

1865

}

1866

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

1867

network.ifr_flags |= IFF_UP;

1868

take_down_interface = true;

1869

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

1870

if(ret == -1){

1871

take_down_interface = false;

1872

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1873

exitcode = EX_OSERR;

1874

#ifdef __linux__

1875

if(restore_loglevel){

1876

ret = klogctl(7, NULL, 0);

1877

if(ret == -1){

1878

perror_plus("klogctl");

2288

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

2289

if(mc.interfaces == NULL){

2290

struct dirent **direntries;

2291

/* Look for any good interfaces */

2292

ret = scandir(sys_class_net, &direntries, good_interface,

2293

alphasort);

2294

if(ret >= 1){

2295

/* Add all found interfaces to interfaces list */

2296

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

2297

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

2298

direntries[i]->d_name);

2299

if(ret_errno != 0){

2300

errno = ret_errno;

2301

perror_plus("argz_add");

2302

continue;

2303

}

2304

if(debug){

2305

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

2306

direntries[i]->d_name);

2307

}

2308

}

2309

free(direntries);

2310

} else {

2311

free(direntries);

2312

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

2313

exitcode = EXIT_FAILURE;

2314

goto end;

2315

}

2316

}

2317

2318

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

2319

{

2320

char *interface = NULL;

2321

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

2322

interface))){

2323

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

2324

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

2325

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

2326

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

2327

interface);

2328

interface = NULL;

2329

while((interface = argz_next(mc.interfaces,

2330

mc.interfaces_size, interface))){

2331

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

2332

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

2333

interface);

2334

interface = NULL;

1879

2335

}

1880

2336

}

1881

#endif /* __linux__ */

1882

/* Lower privileges */

1883

errno = 0;

1884

ret = seteuid(uid);

1885

if(ret == -1){

1886

perror_plus("seteuid");

1887

}

1888

goto end;

1889

}

1890

}

1891

/* Sleep checking until interface is running.

1892

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

1893

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

1894

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

1895

if(ret == -1){

1896

perror_plus("ioctl SIOCGIFFLAGS");

1897

} else if(network.ifr_flags & IFF_RUNNING){

1898

2337

break;

1899

2338

}

1900

struct timespec sleeptime = { .tv_nsec = 250000000 };

1901

ret = nanosleep(&sleeptime, NULL);

1902

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

1903

perror_plus("nanosleep");

1904

}

1905

}

1906

if(not take_down_interface){

1907

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

1908

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

1909

if(ret == -1){

1910

perror_plus("close");

1911

}

1912

}

1913

#ifdef __linux__

1914

if(restore_loglevel){

1915

/* Restores kernel loglevel to default */

1916

ret = klogctl(7, NULL, 0);

1917

if(ret == -1){

1918

perror_plus("klogctl");

1919

}

1920

}

1921

#endif /* __linux__ */

1922

/* Lower privileges */

1923

errno = 0;

1924

if(take_down_interface){

1925

/* Lower privileges */

1926

ret = seteuid(uid);

1927

if(ret == -1){

1928

perror_plus("seteuid");

1929

}

1930

} else {

1931

/* Lower privileges permanently */

1932

ret = setuid(uid);

1933

if(ret == -1){

1934

perror_plus("setuid");

1935

}

1936

}

2339

bool interface_was_up = interface_is_up(interface);

2340

errno = bring_up_interface(interface, delay);

2341

if(not interface_was_up){

2342

if(errno != 0){

2343

perror_plus("Failed to bring up interface");

2344

} else {

2345

errno = argz_add(&interfaces_to_take_down,

2346

&interfaces_to_take_down_size,

2347

interface);

2348

if(errno != 0){

2349

perror_plus("argz_add");

2350

}

2351

}

2352

}

2353

}

2354

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

2355

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

2356

}

2357

}

2358

2359

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

2360

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

2361

if(debug){

2362

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

2363

mc.interfaces);

2364

}

2365

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

1937

2366

}

1938

2367

1939

2368

if(quit_now){

1940

2369

goto end;

1941

2370

}

1942

2371

1943

ret = init_gnutls_global(pubkey, seckey);

2372

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

1944

2373

if(ret == -1){

1945

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

2374

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

1946

2375

exitcode = EX_UNAVAILABLE;

1947

2376

goto end;

1948

2377

} else {

1953

2382

goto end;

1954

2383

}

1955

2384

1956

if(mkdtemp(tempdir) == NULL){

2385

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

2386

tempdir = mkdtemp(run_tempdir);

2387

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

2388

if(debug){

2389

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

2390

run_tempdir, old_tempdir);

2391

}

2392

tempdir = mkdtemp(old_tempdir);

2393

}

2394

if(tempdir == NULL){

1957

2395

perror_plus("mkdtemp");

1958

2396

goto end;

1959

2397

}

1960

tempdir_created = true;

1961

2398

1962

2399

if(quit_now){

1963

2400

goto end;

1964

2401

}

1965

2402

1966

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

1967

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

2403

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

2404

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

1968

2405

exitcode = EX_UNAVAILABLE;

1969

2406

goto end;

1970

2407

} else {

1979

2416

/* Connect directly, do not use Zeroconf */

1980

2417

/* (Mainly meant for debugging) */

1981

2418

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

2419

1982

2420

if(address == NULL){

1983

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

2421

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

1984

2422

exitcode = EX_USAGE;

1985

2423

goto end;

1986

2424

}

1989

2427

goto end;

1990

2428

}

1991

2429

1992

uint16_t port;

2430

in_port_t port;

1993

2431

errno = 0;

1994

2432

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

1995

2433

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

1996

or tmpmax != (uint16_t)tmpmax){

1997

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

2434

or tmpmax != (in_port_t)tmpmax){

2435

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

1998

2436

exitcode = EX_USAGE;

1999

2437

goto end;

2000

2438

}

2001

2439

2002

2440

if(quit_now){

2003

2441

goto end;

2004

2442

}

2005

2443

2006

port = (uint16_t)tmpmax;

2444

port = (in_port_t)tmpmax;

2007

2445

*address = '\0';

2008

2446

/* Colon in address indicates IPv6 */

2009

2447

int af;

2025

2463

}

2026

2464

2027

2465

while(not quit_now){

2028

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

2466

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

2467

&mc);

2029

2468

if(quit_now or ret == 0){

2030

2469

break;

2031

2470

}

2032

2471

if(debug){

2033

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

2034

(int)retry_interval);

2472

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

2473

(int)retry_interval);

2035

2474

}

2036

sleep((int)retry_interval);

2475

sleep((unsigned int)retry_interval);

2037

2476

}

2038

2477

2039

if (not quit_now){

2478

if(not quit_now){

2040

2479

exitcode = EXIT_SUCCESS;

2041

2480

}

2042

2481

2057

2496

config.publish_domain = 0;

2058

2497

2059

2498

/* Allocate a new server */

2060

mc.server = avahi_server_new(avahi_simple_poll_get

2061

(mc.simple_poll), &config, NULL,

2062

NULL, &error);

2499

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2500

&config, NULL, NULL, &ret_errno);

2063

2501

2064

2502

/* Free the Avahi configuration data */

2065

2503

avahi_server_config_free(&config);

2067

2505

2068

2506

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

2069

2507

if(mc.server == NULL){

2070

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

2071

avahi_strerror(error));

2508

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

2509

avahi_strerror(ret_errno));

2072

2510

exitcode = EX_UNAVAILABLE;

2073

2511

goto end;

2074

2512

}

2080

2518

/* Create the Avahi service browser */

2081

2519

sb = avahi_s_service_browser_new(mc.server, if_index,

2082

2520

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2083

NULL, 0, browse_callback, NULL);

2521

NULL, 0, browse_callback,

2522

(void *)&mc);

2084

2523

if(sb == NULL){

2085

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

2086

avahi_strerror(avahi_server_errno(mc.server)));

2524

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

2525

avahi_strerror(avahi_server_errno(mc.server)));

2087

2526

exitcode = EX_UNAVAILABLE;

2088

2527

goto end;

2089

2528

}

2095

2534

/* Run the main loop */

2096

2535

2097

2536

if(debug){

2098

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

2537

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

2099

2538

}

2100

2101

ret = avahi_loop_with_timeout(mc.simple_poll,

2102

(int)(retry_interval * 1000));

2539

2540

ret = avahi_loop_with_timeout(simple_poll,

2541

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

2103

2542

if(debug){

2104

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

2105

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

2543

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

2544

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

2106

2545

}

2107

2546

2108

2547

end:

2109

2548

2110

2549

if(debug){

2111

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

2550

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

2112

2551

}

2113

2552

2114

2553

/* Cleanup things */

2554

free(mc.interfaces);

2555

2115

2556

if(sb != NULL)

2116

2557

avahi_s_service_browser_free(sb);

2117

2558

2118

2559

if(mc.server != NULL)

2119

2560

avahi_server_free(mc.server);

2120

2561

2121

if(mc.simple_poll != NULL)

2122

avahi_simple_poll_free(mc.simple_poll);

2562

if(simple_poll != NULL)

2563

avahi_simple_poll_free(simple_poll);

2123

2564

2124

2565

if(gnutls_initialized){

2125

2566

gnutls_certificate_free_credentials(mc.cred);

2130

2571

if(gpgme_initialized){

2131

2572

gpgme_release(mc.ctx);

2132

2573

}

2133

2574

2134

2575

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

2135

2576

has seen */

2136

2577

if(mc.current_server != NULL){

2142

2583

}

2143

2584

}

2144

2585

2145

/* XXX run network hooks "stop" here */

2146

2147

/* Take down the network interface */

2148

if(take_down_interface){

2149

/* Re-raise priviliges */

2150

errno = 0;

2151

ret = seteuid(0);

2152

if(ret == -1){

2153

perror_plus("seteuid");

2586

/* Re-raise privileges */

2587

{

2588

ret_errno = raise_privileges();

2589

if(ret_errno != 0){

2590

perror_plus("Failed to raise privileges");

2591

} else {

2592

2593

/* Run network hooks */

2594

run_network_hooks("stop", interfaces_hooks != NULL ?

2595

interfaces_hooks : "", delay);

2596

2597

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

2598

{

2599

char *interface = NULL;

2600

while((interface=argz_next(interfaces_to_take_down,

2601

interfaces_to_take_down_size,

2602

interface))){

2603

ret_errno = take_down_interface(interface);

2604

if(ret_errno != 0){

2605

errno = ret_errno;

2606

perror_plus("Failed to take down interface");

2607

}

2608

}

2609

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

2610

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

2611

" down\n");

2612

}

2613

}

2154

2614

}

2155

if(geteuid() == 0){

2156

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

2157

if(ret == -1){

2158

perror_plus("ioctl SIOCGIFFLAGS");

2159

} else if(network.ifr_flags & IFF_UP) {

2160

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

2161

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

2162

if(ret == -1){

2163

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2164

}

2165

}

2166

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

2167

if(ret == -1){

2168

perror_plus("close");

2169

}

2170

/* Lower privileges permanently */

2171

errno = 0;

2172

ret = setuid(uid);

2173

if(ret == -1){

2174

perror_plus("setuid");

2175

}

2615

2616

ret_errno = lower_privileges_permanently();

2617

if(ret_errno != 0){

2618

perror_plus("Failed to lower privileges permanently");

2176

2619

}

2177

2620

}

2178

2621

2622

free(interfaces_to_take_down);

2623

free(interfaces_hooks);

2624

2179

2625

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

2180

if(tempdir_created){

2626

if(tempdir != NULL){

2181

2627

struct dirent **direntries = NULL;

2182

2628

struct dirent *direntry = NULL;

2183

2629

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

2184

2630

alphasort);

2185

if (numentries > 0){

2631

if(numentries > 0){

2186

2632

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

2187

2633

direntry = direntries[i];

2188

2634

char *fullname = NULL;

2194

2640

}

2195

2641

ret = remove(fullname);

2196

2642

if(ret == -1){

2197

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

2198

strerror(errno));

2643

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

2644

strerror(errno));

2199

2645

}

2200

2646

free(fullname);

2201

2647

}

2202

2648

}

2203

2649

2204

2650

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

2205

2651

free(direntries);

2206

if (numentries == -1){

2652

if(numentries == -1){

2207

2653

perror_plus("scandir");

2208

2654

}

2209

2655

ret = rmdir(tempdir);