/mandos/release : revision 237.7.34

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

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*

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* Everything else is

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*

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

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

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* along with this program. If not, see

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

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*

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

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

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*/

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

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#ifndef _LARGEFILE_SOURCE

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#define _LARGEFILE_SOURCE

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#endif /* not _LARGEFILE_SOURCE */

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#endif

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#ifndef _FILE_OFFSET_BITS

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#define _FILE_OFFSET_BITS 64

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#endif /* not _FILE_OFFSET_BITS */

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#endif

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

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

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stdout, ferror() */

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

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stdout, ferror(), remove() */

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

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

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

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strtof(), abort() */

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

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

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asprintf(), strncpy(), strsignal()

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*/

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

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

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

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

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sockaddr_in6, PF_INET6,

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SOCK_STREAM, uid_t, gid_t, open(),

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opendir(), DIR */

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

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

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

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inet_pton(), connect(),

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getnameinfo() */

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

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inet_pton(), connect() */

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

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

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*/

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

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strtoimax() */

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

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EAI_SYSTEM, ENETUNREACH,

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EHOSTUNREACH, ECONNREFUSED, EPROTO,

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EIO, ENOENT, ENXIO, ENOMEM, EISDIR,

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ENOTEMPTY,

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

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*/

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

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

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

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unlinkat() */

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

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setgid(), pause() */

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

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

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

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argp_state, struct argp,

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raise() */

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

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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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

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WEXITSTATUS(), WTERMSIG() */

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

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

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argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

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argz_count() */

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

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EAI_SYSTEM, gai_strerror() */

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#ifdef __linux__

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

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init_gnutls_session(),

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GNUTLS_* */

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#include <gnutls/openpgp.h>

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* GPGME */

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

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

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#define SECKEY "seckey.txt"

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#define PUBKEY "pubkey.txt"

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

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bool debug = false;

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static const char mandos_protocol_version[] = "1";

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

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

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

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

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char *connect_to = NULL;

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const char *hookdir = HOOKDIR;

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int hookdir_fd = -1;

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uid_t uid = 65534;

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gid_t gid = 65534;

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

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typedef struct server{

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const char *ip;

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in_port_t port;

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uint16_t port;

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AvahiIfIndex if_index;

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int af;

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struct timespec last_seen;

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

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typedef struct {

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AvahiSimplePoll *simple_poll;

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AvahiServer *server;

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gnutls_certificate_credentials_t cred;

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unsigned int dh_bits;

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const char *priority;

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gpgme_ctx_t ctx;

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server *current_server;

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char *interfaces;

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size_t interfaces_size;

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} mandos_context;

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/* global so signal handler can reach it*/

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AvahiSimplePoll *simple_poll;

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

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

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.dh_bits = 1024, .priority = "SECURE256"

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

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.current_server = NULL };

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sig_atomic_t quit_now = 0;

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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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168

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

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169

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))

194

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

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va_list ap;

196

va_start (ap, format);

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

199

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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177

*/

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__attribute__((nonnull, warn_unused_result))

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178

size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

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size_t buffer_capacity){

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if(buffer_length + BUFFER_SIZE > buffer_capacity){

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

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if(new_buf == NULL){

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int old_errno = errno;

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free(*buffer);

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errno = old_errno;

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*buffer = NULL;

181

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

182

if(buffer == NULL){

218

183

return 0;

219

184

}

220

*buffer = new_buf;

221

185

buffer_capacity += BUFFER_SIZE;

222

186

}

223

187

return buffer_capacity;

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188

}

225

189

226

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

227

__attribute__((nonnull, warn_unused_result))

228

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

229

int af, server **current_server){

190

int add_server(const char *ip, uint16_t port,

191

AvahiIfIndex if_index,

192

int af){

230

193

int ret;

231

194

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

232

195

if(new_server == NULL){

233

196

perror_plus("malloc");

234

return false;

197

return -1;

235

198

}

236

199

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

237

.port = port,

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.if_index = if_index,

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.af = af };

200

.port = port,

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.if_index = if_index,

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.af = af };

240

203

if(new_server->ip == NULL){

241

204

perror_plus("strdup");

242

free(new_server);

243

return false;

244

}

245

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

246

if(ret == -1){

247

perror_plus("clock_gettime");

248

#ifdef __GNUC__

249

#pragma GCC diagnostic push

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#pragma GCC diagnostic ignored "-Wcast-qual"

251

#endif

252

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

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#ifdef __GNUC__

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#pragma GCC diagnostic pop

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#endif

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free(new_server);

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return false;

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}

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/* Special case of first server */

260

if(*current_server == NULL){

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return -1;

206

}

207

/* unique case of first server */

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if (mc.current_server == NULL){

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209

new_server->next = new_server;

262

210

new_server->prev = new_server;

263

*current_server = new_server;

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mc.current_server = new_server;

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

264

213

} else {

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

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new_server->next = *current_server;

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

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new_server->next = mc.current_server;

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

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new_server->prev->next = new_server;

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(*current_server)->prev = new_server;

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}

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return true;

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mc.current_server->prev = new_server;

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}

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

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if(ret == -1){

221

perror_plus("clock_gettime");

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return -1;

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}

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return 0;

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}

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/*

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* Initialize GPGME.

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229

*/

277

__attribute__((nonnull, warn_unused_result))

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static bool init_gpgme(const char * const seckey,

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const char * const pubkey,

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const char * const tempdir,

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mandos_context *mc){

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static bool init_gpgme(const char *seckey,

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const char *pubkey, const char *tempdir){

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gpgme_error_t rc;

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gpgme_engine_info_t engine_info;

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285

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/*

286

237

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

287

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*/

288

bool import_key(const char * const filename){

239

bool import_key(const char *filename){

289

240

int ret;

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241

int fd;

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gpgme_data_t pgp_data;

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299

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

300

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if(rc != GPG_ERR_NO_ERROR){

301

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

303

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return false;

304

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}

305

256

306

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

257

rc = gpgme_op_import(mc.ctx, pgp_data);

307

258

if(rc != GPG_ERR_NO_ERROR){

308

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

309

gpgme_strsource(rc), gpgme_strerror(rc));

259

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

260

gpgme_strsource(rc), gpgme_strerror(rc));

310

261

return false;

311

262

}

312

263

313

ret = close(fd);

264

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

314

265

if(ret == -1){

315

266

perror_plus("close");

316

267

}

319

270

}

320

271

321

272

if(debug){

322

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

273

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

323

274

}

324

275

325

276

/* Init GPGME */

326

277

gpgme_check_version(NULL);

327

278

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

328

279

if(rc != GPG_ERR_NO_ERROR){

329

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

330

gpgme_strsource(rc), gpgme_strerror(rc));

280

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

281

gpgme_strsource(rc), gpgme_strerror(rc));

331

282

return false;

332

283

}

333

284

334

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

285

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

335

286

rc = gpgme_get_engine_info(&engine_info);

336

287

if(rc != GPG_ERR_NO_ERROR){

337

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

338

gpgme_strsource(rc), gpgme_strerror(rc));

288

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

289

gpgme_strsource(rc), gpgme_strerror(rc));

339

290

return false;

340

291

}

341

292

while(engine_info != NULL){

347

298

engine_info = engine_info->next;

348

299

}

349

300

if(engine_info == NULL){

350

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

351

tempdir);

301

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

352

302

return false;

353

303

}

354

304

355

305

/* Create new GPGME "context" */

356

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

306

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

357

307

if(rc != GPG_ERR_NO_ERROR){

358

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

359

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

360

gpgme_strerror(rc));

308

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

309

gpgme_strsource(rc), gpgme_strerror(rc));

361

310

return false;

362

311

}

363

312

372

321

* Decrypt OpenPGP data.

373

322

* Returns -1 on error

374

323

*/

375

__attribute__((nonnull, warn_unused_result))

376

324

static ssize_t pgp_packet_decrypt(const char *cryptotext,

377

325

size_t crypto_size,

378

char **plaintext,

379

mandos_context *mc){

326

char **plaintext){

380

327

gpgme_data_t dh_crypto, dh_plain;

381

328

gpgme_error_t rc;

382

329

ssize_t ret;

384

331

ssize_t plaintext_length = 0;

385

332

386

333

if(debug){

387

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

334

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

388

335

}

389

336

390

337

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

391

338

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

392

339

0);

393

340

if(rc != GPG_ERR_NO_ERROR){

394

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

395

gpgme_strsource(rc), gpgme_strerror(rc));

341

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

342

gpgme_strsource(rc), gpgme_strerror(rc));

396

343

return -1;

397

344

}

398

345

399

346

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

400

347

rc = gpgme_data_new(&dh_plain);

401

348

if(rc != GPG_ERR_NO_ERROR){

402

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

403

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

404

gpgme_strsource(rc), gpgme_strerror(rc));

349

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

350

gpgme_strsource(rc), gpgme_strerror(rc));

405

351

gpgme_data_release(dh_crypto);

406

352

return -1;

407

353

}

408

354

409

355

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

410

356

data buffer */

411

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

357

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

412

358

if(rc != GPG_ERR_NO_ERROR){

413

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

414

gpgme_strsource(rc), gpgme_strerror(rc));

359

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

360

gpgme_strsource(rc), gpgme_strerror(rc));

415

361

plaintext_length = -1;

416

362

if(debug){

417

363

gpgme_decrypt_result_t result;

418

result = gpgme_op_decrypt_result(mc->ctx);

364

result = gpgme_op_decrypt_result(mc.ctx);

419

365

if(result == NULL){

420

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

366

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

421

367

} else {

422

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

423

result->unsupported_algorithm);

424

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

425

result->wrong_key_usage);

368

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

369

result->unsupported_algorithm);

370

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

371

result->wrong_key_usage);

426

372

if(result->file_name != NULL){

427

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

373

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

428

374

}

429

375

gpgme_recipient_t recipient;

430

376

recipient = result->recipients;

431

377

while(recipient != NULL){

432

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

433

gpgme_pubkey_algo_name

434

(recipient->pubkey_algo));

435

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

436

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

437

recipient->status == GPG_ERR_NO_SECKEY

438

? "No" : "Yes");

378

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

379

gpgme_pubkey_algo_name(recipient->pubkey_algo));

380

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

381

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

382

recipient->status == GPG_ERR_NO_SECKEY

383

? "No" : "Yes");

439

384

recipient = recipient->next;

440

385

}

441

386

}

444

389

}

445

390

446

391

if(debug){

447

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

392

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

448

393

}

449

394

450

395

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

457

402

*plaintext = NULL;

458

403

while(true){

459

404

plaintext_capacity = incbuffer(plaintext,

460

(size_t)plaintext_length,

461

plaintext_capacity);

405

(size_t)plaintext_length,

406

plaintext_capacity);

462

407

if(plaintext_capacity == 0){

463

perror_plus("incbuffer");

464

plaintext_length = -1;

465

goto decrypt_end;

408

perror_plus("incbuffer");

409

plaintext_length = -1;

410

goto decrypt_end;

466

411

}

467

412

468

413

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

481

426

}

482

427

483

428

if(debug){

484

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

429

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

485

430

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

486

431

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

487

432

}

498

443

return plaintext_length;

499

444

}

500

445

501

__attribute__((warn_unused_result, const))

502

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

503

if(str == NULL)

504

return "(unknown)";

505

return str;

506

}

507

508

__attribute__((warn_unused_result))

509

static const char *safer_gnutls_strerror(int value){

510

const char *ret = gnutls_strerror(value);

511

return safe_string(ret);

446

static const char * safer_gnutls_strerror(int value){

447

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

448

-Wunreachable-code */

449

if(ret == NULL)

450

ret = "(unknown)";

451

return ret;

512

452

}

513

453

514

454

/* GnuTLS log function callback */

515

__attribute__((nonnull))

516

455

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

517

456

const char* string){

518

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

457

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

519

458

}

520

459

521

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

522

460

static int init_gnutls_global(const char *pubkeyfilename,

523

const char *seckeyfilename,

524

const char *dhparamsfilename,

525

mandos_context *mc){

461

const char *seckeyfilename){

526

462

int ret;

527

unsigned int uret;

528

463

529

464

if(debug){

530

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

465

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

466

}

467

468

ret = gnutls_global_init();

469

if(ret != GNUTLS_E_SUCCESS){

470

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

471

safer_gnutls_strerror(ret));

472

return -1;

531

473

}

532

474

533

475

if(debug){

539

481

}

540

482

541

483

/* OpenPGP credentials */

542

ret = gnutls_certificate_allocate_credentials(&mc->cred);

484

ret = gnutls_certificate_allocate_credentials(&mc.cred);

543

485

if(ret != GNUTLS_E_SUCCESS){

544

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

545

safer_gnutls_strerror(ret));

486

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

487

safer_gnutls_strerror(ret));

488

gnutls_global_deinit();

546

489

return -1;

547

490

}

548

491

549

492

if(debug){

550

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

551

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

552

pubkeyfilename,

553

seckeyfilename);

493

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

494

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

495

seckeyfilename);

554

496

}

555

497

556

498

ret = gnutls_certificate_set_openpgp_key_file

557

(mc->cred, pubkeyfilename, seckeyfilename,

499

(mc.cred, pubkeyfilename, seckeyfilename,

558

500

GNUTLS_OPENPGP_FMT_BASE64);

559

501

if(ret != GNUTLS_E_SUCCESS){

560

fprintf_plus(stderr,

561

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

562

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

563

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

564

safer_gnutls_strerror(ret));

502

fprintf(stderr,

503

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

504

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

505

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

506

safer_gnutls_strerror(ret));

565

507

goto globalfail;

566

508

}

567

509

568

510

/* GnuTLS server initialization */

569

ret = gnutls_dh_params_init(&mc->dh_params);

570

if(ret != GNUTLS_E_SUCCESS){

571

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

572

" initialization: %s\n",

573

safer_gnutls_strerror(ret));

574

goto globalfail;

575

}

576

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

577

if(dhparamsfilename != NULL){

578

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

579

do {

580

int dhpfile = open(dhparamsfilename, O_RDONLY);

581

if(dhpfile == -1){

582

perror_plus("open");

583

dhparamsfilename = NULL;

584

break;

585

}

586

size_t params_capacity = 0;

587

while(true){

588

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

589

(size_t)params.size,

590

(size_t)params_capacity);

591

if(params_capacity == 0){

592

perror_plus("incbuffer");

593

free(params.data);

594

params.data = NULL;

595

dhparamsfilename = NULL;

596

break;

597

}

598

ssize_t bytes_read = read(dhpfile,

599

params.data + params.size,

600

BUFFER_SIZE);

601

/* EOF */

602

if(bytes_read == 0){

603

break;

604

}

605

/* check bytes_read for failure */

606

if(bytes_read < 0){

607

perror_plus("read");

608

free(params.data);

609

params.data = NULL;

610

dhparamsfilename = NULL;

611

break;

612

}

613

params.size += (unsigned int)bytes_read;

614

}

615

if(params.data == NULL){

616

dhparamsfilename = NULL;

617

}

618

if(dhparamsfilename == NULL){

619

break;

620

}

621

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

622

GNUTLS_X509_FMT_PEM);

623

if(ret != GNUTLS_E_SUCCESS){

624

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

625

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

626

safer_gnutls_strerror(ret));

627

dhparamsfilename = NULL;

628

}

629

free(params.data);

630

} while(false);

631

}

632

if(dhparamsfilename == NULL){

633

if(mc->dh_bits == 0){

634

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

635

/* Try to read the private key file */

636

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

637

do {

638

int secfile = open(seckeyfilename, O_RDONLY);

639

if(secfile == -1){

640

perror_plus("open");

641

break;

642

}

643

size_t buffer_capacity = 0;

644

while(true){

645

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

646

(size_t)buffer.size,

647

(size_t)buffer_capacity);

648

if(buffer_capacity == 0){

649

perror_plus("incbuffer");

650

free(buffer.data);

651

buffer.data = NULL;

652

break;

653

}

654

ssize_t bytes_read = read(secfile,

655

buffer.data + buffer.size,

656

BUFFER_SIZE);

657

/* EOF */

658

if(bytes_read == 0){

659

break;

660

}

661

/* check bytes_read for failure */

662

if(bytes_read < 0){

663

perror_plus("read");

664

free(buffer.data);

665

buffer.data = NULL;

666

break;

667

}

668

buffer.size += (unsigned int)bytes_read;

669

}

670

close(secfile);

671

} while(false);

672

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

673

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

674

if(buffer.data != NULL){

675

{

676

gnutls_openpgp_privkey_t privkey = NULL;

677

ret = gnutls_openpgp_privkey_init(&privkey);

678

if(ret != GNUTLS_E_SUCCESS){

679

fprintf_plus(stderr, "Error initializing OpenPGP key"

680

" structure: %s",

681

safer_gnutls_strerror(ret));

682

free(buffer.data);

683

buffer.data = NULL;

684

} else {

685

ret = gnutls_openpgp_privkey_import

686

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

687

if(ret != GNUTLS_E_SUCCESS){

688

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

689

safer_gnutls_strerror(ret));

690

privkey = NULL;

691

}

692

free(buffer.data);

693

buffer.data = NULL;

694

if(privkey != NULL){

695

/* Use private key to suggest an appropriate

696

sec_param */

697

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

698

gnutls_openpgp_privkey_deinit(privkey);

699

if(debug){

700

fprintf_plus(stderr, "This OpenPGP key implies using"

701

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

702

safe_string(gnutls_sec_param_get_name

703

(sec_param)));

704

}

705

}

706

}

707

}

708

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

709

/* Err on the side of caution */

710

sec_param = GNUTLS_SEC_PARAM_ULTRA;

711

if(debug){

712

fprintf_plus(stderr, "Falling back to security parameter"

713

" \"%s\"\n",

714

safe_string(gnutls_sec_param_get_name

715

(sec_param)));

716

}

717

}

718

}

719

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

720

if(uret != 0){

721

mc->dh_bits = uret;

722

if(debug){

723

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

724

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

725

safe_string(gnutls_sec_param_get_name

726

(sec_param)),

727

mc->dh_bits);

728

}

729

} else {

730

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

731

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

732

safe_string(gnutls_sec_param_get_name

733

(sec_param)),

734

safer_gnutls_strerror(ret));

735

goto globalfail;

736

}

737

} else if(debug){

738

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

739

mc->dh_bits);

740

}

741

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

742

if(ret != GNUTLS_E_SUCCESS){

743

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

744

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

745

safer_gnutls_strerror(ret));

746

goto globalfail;

747

}

748

}

749

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

511

ret = gnutls_dh_params_init(&mc.dh_params);

512

if(ret != GNUTLS_E_SUCCESS){

513

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

514

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

515

goto globalfail;

516

}

517

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

518

if(ret != GNUTLS_E_SUCCESS){

519

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

520

safer_gnutls_strerror(ret));

521

goto globalfail;

522

}

523

524

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

750

525

751

526

return 0;

752

527

753

528

globalfail:

754

529

755

gnutls_certificate_free_credentials(mc->cred);

756

gnutls_dh_params_deinit(mc->dh_params);

530

gnutls_certificate_free_credentials(mc.cred);

531

gnutls_global_deinit();

532

gnutls_dh_params_deinit(mc.dh_params);

757

533

return -1;

758

534

}

759

535

760

__attribute__((nonnull, warn_unused_result))

761

static int init_gnutls_session(gnutls_session_t *session,

762

mandos_context *mc){

536

static int init_gnutls_session(gnutls_session_t *session){

763

537

int ret;

764

538

/* GnuTLS session creation */

765

539

do {

769

543

}

770

544

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

771

545

if(ret != GNUTLS_E_SUCCESS){

772

fprintf_plus(stderr,

773

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

774

safer_gnutls_strerror(ret));

546

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

547

safer_gnutls_strerror(ret));

775

548

}

776

549

777

550

{

778

551

const char *err;

779

552

do {

780

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

553

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

781

554

if(quit_now){

782

555

gnutls_deinit(*session);

783

556

return -1;

784

557

}

785

558

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

786

559

if(ret != GNUTLS_E_SUCCESS){

787

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

788

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

789

safer_gnutls_strerror(ret));

560

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

561

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

562

safer_gnutls_strerror(ret));

790

563

gnutls_deinit(*session);

791

564

return -1;

792

565

}

794

567

795

568

do {

796

569

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

797

mc->cred);

570

mc.cred);

798

571

if(quit_now){

799

572

gnutls_deinit(*session);

800

573

return -1;

801

574

}

802

575

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

803

576

if(ret != GNUTLS_E_SUCCESS){

804

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

805

safer_gnutls_strerror(ret));

577

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

578

safer_gnutls_strerror(ret));

806

579

gnutls_deinit(*session);

807

580

return -1;

808

581

}

810

583

/* ignore client certificate if any. */

811

584

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

812

585

586

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

587

813

588

return 0;

814

589

}

815

590

817

592

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

818

593

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

819

594

820

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

821

__attribute__((warn_unused_result))

822

int raise_privileges(void){

823

int old_errno = errno;

824

int ret = 0;

825

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

826

ret = errno;

827

}

828

errno = old_errno;

829

return ret;

830

}

831

832

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

833

__attribute__((warn_unused_result))

834

int raise_privileges_permanently(void){

835

int old_errno = errno;

836

int ret = raise_privileges();

837

if(ret != 0){

838

errno = old_errno;

839

return ret;

840

}

841

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

842

ret = errno;

843

}

844

errno = old_errno;

845

return ret;

846

}

847

848

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

849

__attribute__((warn_unused_result))

850

int lower_privileges(void){

851

int old_errno = errno;

852

int ret = 0;

853

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

854

ret = errno;

855

}

856

errno = old_errno;

857

return ret;

858

}

859

860

/* Lower privileges permanently */

861

__attribute__((warn_unused_result))

862

int lower_privileges_permanently(void){

863

int old_errno = errno;

864

int ret = 0;

865

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

866

ret = errno;

867

}

868

errno = old_errno;

869

return ret;

870

}

871

872

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

873

__attribute__((nonnull, warn_unused_result))

874

static bool add_delete_local_route(const bool add,

875

const char *address,

876

AvahiIfIndex if_index){

877

int ret;

878

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

879

char add_arg[] = "add";

880

char delete_arg[] = "delete";

881

char debug_flag[] = "--debug";

882

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

883

if(pluginhelperdir == NULL){

884

if(debug){

885

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

886

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

887

}

888

return false;

889

}

890

891

char interface[IF_NAMESIZE];

892

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

893

perror_plus("if_indextoname");

894

return false;

895

}

896

897

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

898

if(devnull == -1){

899

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

900

return false;

901

}

902

pid_t pid = fork();

903

if(pid == 0){

904

/* Child */

905

/* Raise privileges */

906

errno = raise_privileges_permanently();

907

if(errno != 0){

908

perror_plus("Failed to raise privileges");

909

/* _exit(EX_NOPERM); */

910

} else {

911

/* Set group */

912

errno = 0;

913

ret = setgid(0);

914

if(ret == -1){

915

perror_plus("setgid");

916

_exit(EX_NOPERM);

917

}

918

/* Reset supplementary groups */

919

errno = 0;

920

ret = setgroups(0, NULL);

921

if(ret == -1){

922

perror_plus("setgroups");

923

_exit(EX_NOPERM);

924

}

925

}

926

ret = dup2(devnull, STDIN_FILENO);

927

if(ret == -1){

928

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

929

_exit(EX_OSERR);

930

}

931

ret = close(devnull);

932

if(ret == -1){

933

perror_plus("close");

934

_exit(EX_OSERR);

935

}

936

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

937

if(ret == -1){

938

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

939

_exit(EX_OSERR);

940

}

941

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

942

O_RDONLY

943

| O_DIRECTORY

944

| O_PATH

945

| O_CLOEXEC));

946

if(helperdir_fd == -1){

947

perror_plus("open");

948

_exit(EX_UNAVAILABLE);

949

}

950

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

951

helper, O_RDONLY));

952

if(helper_fd == -1){

953

perror_plus("openat");

954

close(helperdir_fd);

955

_exit(EX_UNAVAILABLE);

956

}

957

close(helperdir_fd);

958

#ifdef __GNUC__

959

#pragma GCC diagnostic push

960

#pragma GCC diagnostic ignored "-Wcast-qual"

961

#endif

962

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

963

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

964

interface, debug ? debug_flag : NULL, NULL },

965

environ) == -1){

966

#ifdef __GNUC__

967

#pragma GCC diagnostic pop

968

#endif

969

perror_plus("fexecve");

970

_exit(EXIT_FAILURE);

971

}

972

}

973

if(pid == -1){

974

perror_plus("fork");

975

return false;

976

}

977

int status;

978

pid_t pret = -1;

979

errno = 0;

980

do {

981

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

982

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

983

int errno_raising = 0;

984

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

985

errno_raising = errno;

986

perror_plus("Failed to raise privileges in order to"

987

" kill helper program");

988

}

989

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

990

perror_plus("kill");

991

}

992

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

993

perror_plus("Failed to lower privileges after killing"

994

" helper program");

995

}

996

return false;

997

}

998

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

999

if(pret == -1){

1000

perror_plus("waitpid");

1001

return false;

1002

}

1003

if(WIFEXITED(status)){

1004

if(WEXITSTATUS(status) != 0){

1005

fprintf_plus(stderr, "Error: iprouteadddel exited"

1006

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

1007

return false;

1008

}

1009

return true;

1010

}

1011

if(WIFSIGNALED(status)){

1012

fprintf_plus(stderr, "Error: iprouteadddel died by"

1013

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

1014

return false;

1015

}

1016

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

1017

return false;

1018

}

1019

1020

__attribute__((nonnull, warn_unused_result))

1021

static bool add_local_route(const char *address,

1022

AvahiIfIndex if_index){

1023

if(debug){

1024

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

1025

}

1026

return add_delete_local_route(true, address, if_index);

1027

}

1028

1029

__attribute__((nonnull, warn_unused_result))

1030

static bool delete_local_route(const char *address,

1031

AvahiIfIndex if_index){

1032

if(debug){

1033

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

1034

}

1035

return add_delete_local_route(false, address, if_index);

1036

}

1037

1038

595

/* Called when a Mandos server is found */

1039

__attribute__((nonnull, warn_unused_result))

1040

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

596

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

1041

597

AvahiIfIndex if_index,

1042

int af, mandos_context *mc){

598

int af){

1043

599

int ret, tcp_sd = -1;

1044

600

ssize_t sret;

1045

struct sockaddr_storage to;

601

union {

602

struct sockaddr_in in;

603

struct sockaddr_in6 in6;

604

} to;

1046

605

char *buffer = NULL;

1047

606

char *decrypted_buffer = NULL;

1048

607

size_t buffer_length = 0;

1051

610

int retval = -1;

1052

611

gnutls_session_t session;

1053

612

int pf; /* Protocol family */

1054

bool route_added = false;

1055

613

1056

614

errno = 0;

1057

615

1068

626

pf = PF_INET;

1069

627

break;

1070

628

default:

1071

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

629

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

1072

630

errno = EINVAL;

1073

631

return -1;

1074

632

}

1075

633

1076

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

1077

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

1078

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

1079

bool match = false;

1080

{

1081

char *interface = NULL;

1082

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

1083

mc->interfaces_size,

1084

interface))){

1085

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

1086

match = true;

1087

break;

1088

}

1089

}

1090

}

1091

if(not match){

1092

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

1093

connect to the server */

1094

if(debug){

1095

char interface[IF_NAMESIZE];

1096

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

1097

perror_plus("if_indextoname");

1098

} else {

1099

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

1100

" \"%s\"\n",

1101

if_indextoname((unsigned int)if_index,

1102

interface));

1103

}

1104

}

1105

return -1;

1106

}

1107

}

1108

1109

ret = init_gnutls_session(&session, mc);

634

ret = init_gnutls_session(&session);

1110

635

if(ret != 0){

1111

636

return -1;

1112

637

}

1113

638

1114

639

if(debug){

1115

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

1116

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

640

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

641

"\n", ip, port);

1117

642

}

1118

643

1119

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

644

tcp_sd = socket(pf, SOCK_STREAM, 0);

1120

645

if(tcp_sd < 0){

1121

646

int e = errno;

1122

647

perror_plus("socket");

1129

654

goto mandos_end;

1130

655

}

1131

656

657

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

1132

658

if(af == AF_INET6){

1133

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

1134

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

1135

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

659

to.in6.sin6_family = (sa_family_t)af;

660

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

1136

661

} else { /* IPv4 */

1137

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

1138

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

1139

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

662

to.in.sin_family = (sa_family_t)af;

663

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

1140

664

}

1141

665

if(ret < 0 ){

1142

666

int e = errno;

1146

670

}

1147

671

if(ret == 0){

1148

672

int e = errno;

1149

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

673

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

1150

674

errno = e;

1151

675

goto mandos_end;

1152

676

}

1153

677

if(af == AF_INET6){

1154

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

1155

if(IN6_IS_ADDR_LINKLOCAL

1156

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

678

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

679

-Wconversion and

680

-Wunreachable-code */

681

682

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

683

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

684

-Wunreachable-code*/

1157

685

if(if_index == AVAHI_IF_UNSPEC){

1158

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

1159

" incomplete without a network interface\n");

686

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

687

" without a network interface\n");

1160

688

errno = EINVAL;

1161

689

goto mandos_end;

1162

690

}

1163

691

/* Set the network interface number as scope */

1164

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

692

to.in6.sin6_scope_id = (uint32_t)if_index;

1165

693

}

1166

694

} else {

1167

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

695

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

696

-Wconversion and

697

-Wunreachable-code */

1168

698

}

1169

699

1170

700

if(quit_now){

1178

708

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

1179

709

perror_plus("if_indextoname");

1180

710

} else {

1181

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

1182

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

711

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

712

ip, interface, port);

1183

713

}

1184

714

} else {

1185

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

1186

ip, (uintmax_t)port);

715

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

716

port);

1187

717

}

1188

718

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

1189

719

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

1190

if(af == AF_INET6){

1191

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

1192

sizeof(struct sockaddr_in6),

1193

addrstr, sizeof(addrstr), NULL, 0,

1194

NI_NUMERICHOST);

1195

} else {

1196

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

1197

sizeof(struct sockaddr_in),

1198

addrstr, sizeof(addrstr), NULL, 0,

1199

NI_NUMERICHOST);

1200

}

1201

if(ret == EAI_SYSTEM){

1202

perror_plus("getnameinfo");

1203

} else if(ret != 0) {

1204

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

1205

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

1206

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

1207

}

1208

}

1209

1210

if(quit_now){

1211

errno = EINTR;

1212

goto mandos_end;

1213

}

1214

1215

while(true){

1216

if(af == AF_INET6){

1217

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

1218

sizeof(struct sockaddr_in6));

1219

} else {

1220

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

1221

sizeof(struct sockaddr_in));

1222

}

1223

if(ret < 0){

1224

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

1225

and if_index != AVAHI_IF_UNSPEC

1226

and connect_to == NULL

1227

and not route_added and

1228

((af == AF_INET6 and not

1229

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1230

&to)->sin6_addr)))

1231

or (af == AF_INET and

1232

/* Not a a IPv4LL address */

1233

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

1234

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

1235

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

1236

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

1237

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

1238

connect to a Mandos server announced by Avahi on a server

1239

host with a global address. Work around this by retrying

1240

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

1241

1242

Avahi bug reference:

1243

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

1244

https://bugs.debian.org/587961

1245

*/

1246

if(debug){

1247

fprintf_plus(stderr, "Mandos server unreachable, trying"

1248

" direct route\n");

1249

}

1250

int e = errno;

1251

route_added = add_local_route(ip, if_index);

1252

if(route_added){

1253

continue;

1254

}

1255

errno = e;

1256

}

1257

if(errno != ECONNREFUSED or debug){

1258

int e = errno;

1259

perror_plus("connect");

1260

errno = e;

1261

}

1262

goto mandos_end;

1263

}

1264

1265

if(quit_now){

1266

errno = EINTR;

1267

goto mandos_end;

1268

}

1269

break;

720

const char *pcret;

721

if(af == AF_INET6){

722

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

723

sizeof(addrstr));

724

} else {

725

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

726

sizeof(addrstr));

727

}

728

if(pcret == NULL){

729

perror_plus("inet_ntop");

730

} else {

731

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

732

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

733

}

734

}

735

}

736

737

if(quit_now){

738

errno = EINTR;

739

goto mandos_end;

740

}

741

742

if(af == AF_INET6){

743

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

744

} else {

745

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

746

}

747

if(ret < 0){

748

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

749

int e = errno;

750

perror_plus("connect");

751

errno = e;

752

}

753

goto mandos_end;

754

}

755

756

if(quit_now){

757

errno = EINTR;

758

goto mandos_end;

1270

759

}

1271

760

1272

761

const char *out = mandos_protocol_version;

1274

763

while(true){

1275

764

size_t out_size = strlen(out);

1276

765

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

1277

out_size - written));

766

out_size - written));

1278

767

if(ret == -1){

1279

768

int e = errno;

1280

769

perror_plus("write");

1300

789

}

1301

790

1302

791

if(debug){

1303

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

792

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

1304

793

}

1305

794

1306

795

if(quit_now){

1308

797

goto mandos_end;

1309

798

}

1310

799

1311

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

1312

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

1313

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

1314

gnutls_transport_set_ptr(session,

1315

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

800

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

801

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

1316

802

1317

803

if(quit_now){

1318

804

errno = EINTR;

1329

815

1330

816

if(ret != GNUTLS_E_SUCCESS){

1331

817

if(debug){

1332

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

818

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

1333

819

gnutls_perror(ret);

1334

820

}

1335

821

errno = EPROTO;

1339

825

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

1340

826

1341

827

if(debug){

1342

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

1343

" %s\n", ip);

828

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

829

ip);

1344

830

}

1345

831

1346

832

while(true){

1351

837

}

1352

838

1353

839

buffer_capacity = incbuffer(&buffer, buffer_length,

1354

buffer_capacity);

840

buffer_capacity);

1355

841

if(buffer_capacity == 0){

1356

842

int e = errno;

1357

843

perror_plus("incbuffer");

1384

870

}

1385

871

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

1386

872

if(ret < 0){

1387

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

1388

"***\n");

873

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

1389

874

gnutls_perror(ret);

1390

875

errno = EPROTO;

1391

876

goto mandos_end;

1392

877

}

1393

878

break;

1394

879

default:

1395

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

1396

" encrypted session with Mandos server\n");

880

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

881

" encrypted session with Mandos server\n");

1397

882

gnutls_bye(session, GNUTLS_SHUT_RDWR);

1398

883

errno = EIO;

1399

884

goto mandos_end;

1404

889

}

1405

890

1406

891

if(debug){

1407

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

892

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

1408

893

}

1409

894

1410

895

if(quit_now){

1422

907

1423

908

if(buffer_length > 0){

1424

909

ssize_t decrypted_buffer_size;

1425

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

1426

&decrypted_buffer, mc);

910

decrypted_buffer_size = pgp_packet_decrypt(buffer,

911

buffer_length,

912

&decrypted_buffer);

1427

913

if(decrypted_buffer_size >= 0){

1428

914

1429

clearerr(stdout);

1430

915

written = 0;

1431

916

while(written < (size_t) decrypted_buffer_size){

1432

917

if(quit_now){

1440

925

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

1441

926

int e = errno;

1442

927

if(debug){

1443

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

1444

strerror(errno));

928

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

929

strerror(errno));

1445

930

}

1446

931

errno = e;

1447

932

goto mandos_end;

1448

933

}

1449

934

written += (size_t)ret;

1450

935

}

1451

ret = fflush(stdout);

1452

if(ret != 0){

1453

int e = errno;

1454

if(debug){

1455

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

1456

strerror(errno));

1457

}

1458

errno = e;

1459

goto mandos_end;

1460

}

1461

936

retval = 0;

1462

937

}

1463

938

}

1466

941

1467

942

mandos_end:

1468

943

{

1469

if(route_added){

1470

if(not delete_local_route(ip, if_index)){

1471

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

1472

" interface %d", ip, if_index);

1473

}

1474

}

1475

944

int e = errno;

1476

945

free(decrypted_buffer);

1477

946

free(buffer);

1478

947

if(tcp_sd >= 0){

1479

ret = close(tcp_sd);

948

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

1480

949

}

1481

950

if(ret == -1){

1482

951

if(e == 0){

1494

963

return retval;

1495

964

}

1496

965

1497

__attribute__((nonnull))

1498

966

static void resolve_callback(AvahiSServiceResolver *r,

1499

967

AvahiIfIndex interface,

1500

968

AvahiProtocol proto,

1508

976

AVAHI_GCC_UNUSED AvahiStringList *txt,

1509

977

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1510

978

flags,

1511

void *mc){

1512

if(r == NULL){

1513

return;

1514

}

979

AVAHI_GCC_UNUSED void* userdata){

980

assert(r);

1515

981

1516

982

/* Called whenever a service has been resolved successfully or

1517

983

timed out */

1518

984

1519

985

if(quit_now){

1520

avahi_s_service_resolver_free(r);

1521

986

return;

1522

987

}

1523

988

1524

989

switch(event){

1525

990

default:

1526

991

case AVAHI_RESOLVER_FAILURE:

1527

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

1528

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

1529

domain,

1530

avahi_strerror(avahi_server_errno

1531

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

992

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

993

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

994

avahi_strerror(avahi_server_errno(mc.server)));

1532

995

break;

1533

996

1534

997

case AVAHI_RESOLVER_FOUND:

1536

999

char ip[AVAHI_ADDRESS_STR_MAX];

1537

1000

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

1538

1001

if(debug){

1539

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

1540

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

1541

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

1002

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

1003

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

1004

ip, (intmax_t)interface, port);

1542

1005

}

1543

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

1544

interface,

1545

avahi_proto_to_af(proto),

1546

mc);

1006

int ret = start_mandos_communication(ip, port, interface,

1007

avahi_proto_to_af(proto));

1547

1008

if(ret == 0){

1548

avahi_simple_poll_quit(simple_poll);

1009

avahi_simple_poll_quit(mc.simple_poll);

1549

1010

} else {

1550

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

1551

avahi_proto_to_af(proto),

1552

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

1553

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

1554

" list\n", name);

1555

}

1011

ret = add_server(ip, port, interface,

1012

avahi_proto_to_af(proto));

1556

1013

}

1557

1014

}

1558

1015

}

1568

1025

const char *domain,

1569

1026

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1570

1027

flags,

1571

void *mc){

1572

if(b == NULL){

1573

return;

1574

}

1028

AVAHI_GCC_UNUSED void* userdata){

1029

assert(b);

1575

1030

1576

1031

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

1577

1032

is removed from the LAN */

1584

1039

default:

1585

1040

case AVAHI_BROWSER_FAILURE:

1586

1041

1587

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

1588

avahi_strerror(avahi_server_errno

1589

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

1590

avahi_simple_poll_quit(simple_poll);

1042

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

1043

avahi_strerror(avahi_server_errno(mc.server)));

1044

avahi_simple_poll_quit(mc.simple_poll);

1591

1045

return;

1592

1046

1593

1047

case AVAHI_BROWSER_NEW:

1596

1050

the callback function is called the Avahi server will free the

1597

1051

resolver for us. */

1598

1052

1599

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

1600

interface, protocol, name, type,

1601

domain, protocol, 0,

1602

resolve_callback, mc) == NULL)

1603

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

1604

" %s\n", name,

1605

avahi_strerror(avahi_server_errno

1606

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

1053

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

1054

name, type, domain, protocol, 0,

1055

resolve_callback, NULL) == NULL)

1056

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

1057

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

1607

1058

break;

1608

1059

1609

1060

case AVAHI_BROWSER_REMOVE:

1612

1063

case AVAHI_BROWSER_ALL_FOR_NOW:

1613

1064

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1614

1065

if(debug){

1615

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

1616

" searching...\n");

1066

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

1617

1067

}

1618

1068

break;

1619

1069

}

1628

1078

signal_received = sig;

1629

1079

int old_errno = errno;

1630

1080

/* set main loop to exit */

1631

if(simple_poll != NULL){

1632

avahi_simple_poll_quit(simple_poll);

1081

if(mc.simple_poll != NULL){

1082

avahi_simple_poll_quit(mc.simple_poll);

1633

1083

}

1634

1084

errno = old_errno;

1635

1085

}

1636

1086

1637

__attribute__((nonnull, warn_unused_result))

1638

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

1639

int ret;

1640

int old_errno;

1641

1642

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

1643

if(s < 0){

1644

old_errno = errno;

1645

perror_plus("socket");

1646

errno = old_errno;

1647

return false;

1648

}

1649

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

1650

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

1651

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1652

if(ret == -1){

1087

/*

1088

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

1089

* corresponds to an acceptable network device.

1090

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

1091

*/

1092

int good_interface(const struct dirent *if_entry){

1093

ssize_t ssret;

1094

char *flagname = NULL;

1095

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

1096

return 0;

1097

}

1098

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

1099

if_entry->d_name);

1100

if(ret < 0){

1101

perror_plus("asprintf");

1102

return 0;

1103

}

1104

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

1105

if(flags_fd == -1){

1106

perror_plus("open");

1107

free(flagname);

1108

return 0;

1109

}

1110

free(flagname);

1111

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

1112

/* read line from flags_fd */

1113

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

1114

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

1115

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

1116

if(flagstring == NULL){

1117

perror_plus("malloc");

1118

close(flags_fd);

1119

return 0;

1120

}

1121

while(to_read > 0){

1122

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

1123

(size_t)to_read));

1124

if(ssret == -1){

1125

perror_plus("read");

1126

free(flagstring);

1127

close(flags_fd);

1128

return 0;

1129

}

1130

to_read -= ssret;

1131

if(ssret == 0){

1132

break;

1133

}

1134

}

1135

close(flags_fd);

1136

intmax_t tmpmax;

1137

char *tmp;

1138

errno = 0;

1139

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

1140

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

1141

and not (isspace(*tmp)))

1142

or tmpmax != (ifreq_flags)tmpmax){

1653

1143

if(debug){

1654

old_errno = errno;

1655

perror_plus("ioctl SIOCGIFFLAGS");

1656

errno = old_errno;

1144

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

1145

flagstring, if_entry->d_name);

1657

1146

}

1658

return false;

1147

free(flagstring);

1148

return 0;

1659

1149

}

1660

return true;

1661

}

1662

1663

__attribute__((nonnull, warn_unused_result))

1664

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

1665

1150

free(flagstring);

1151

ifreq_flags flags = (ifreq_flags)tmpmax;

1666

1152

/* Reject the loopback device */

1667

if(ifr->ifr_flags & IFF_LOOPBACK){

1153

if(flags & IFF_LOOPBACK){

1668

1154

if(debug){

1669

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

1670

ifname);

1155

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

1156

if_entry->d_name);

1671

1157

}

1672

return false;

1158

return 0;

1673

1159

}

1674

1160

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

1675

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

1161

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

1676

1162

if(debug){

1677

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

1678

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

1163

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

1164

if_entry->d_name);

1679

1165

}

1680

return true;

1166

return 1;

1681

1167

}

1682

1168

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

1683

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

1169

if(not (flags & IFF_BROADCAST)){

1684

1170

if(debug){

1685

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1686

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

1171

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

1172

if_entry->d_name);

1687

1173

}

1688

return false;

1174

return 0;

1689

1175

}

1690

1176

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

1691

if(ifr->ifr_flags & IFF_NOARP){

1177

if(flags & IFF_NOARP){

1692

1178

if(debug){

1693

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

1694

ifname);

1179

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

1180

if_entry->d_name);

1695

1181

}

1696

return false;

1182

return 0;

1697

1183

}

1698

1699

1184

/* Accept this device */

1700

1185

if(debug){

1701

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

1702

}

1703

return true;

1704

}

1705

1706

/*

1707

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

1708

* corresponds to an acceptable network device.

1709

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

1710

*/

1711

__attribute__((nonnull, warn_unused_result))

1712

int good_interface(const struct dirent *if_entry){

1713

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

1714

return 0;

1715

}

1716

1717

struct ifreq ifr;

1718

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

1719

if(debug){

1720

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

1721

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

1722

}

1723

return 0;

1724

}

1725

1726

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

1727

return 0;

1186

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

1187

if_entry->d_name);

1728

1188

}

1729

1189

return 1;

1730

1190

}

1731

1191

1732

/*

1733

* This function determines if a network interface is up.

1734

*/

1735

__attribute__((nonnull, warn_unused_result))

1736

bool interface_is_up(const char *interface){

1737

struct ifreq ifr;

1738

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

1739

if(debug){

1740

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

1741

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

1742

}

1743

return false;

1744

}

1745

1746

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

1747

}

1748

1749

/*

1750

* This function determines if a network interface is running

1751

*/

1752

__attribute__((nonnull, warn_unused_result))

1753

bool interface_is_running(const char *interface){

1754

struct ifreq ifr;

1755

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

1756

if(debug){

1757

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

1758

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

1759

}

1760

return false;

1761

}

1762

1763

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

1764

}

1765

1766

__attribute__((nonnull, pure, warn_unused_result))

1767

1192

int notdotentries(const struct dirent *direntry){

1768

1193

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

1769

1194

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

1775

1200

return 1;

1776

1201

}

1777

1202

1778

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

1779

__attribute__((nonnull, warn_unused_result))

1780

int runnable_hook(const struct dirent *direntry){

1781

int ret;

1782

size_t sret;

1783

struct stat st;

1784

1785

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

1786

/* Empty name? */

1787

return 0;

1788

}

1789

1790

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

1791

"abcdefghijklmnopqrstuvwxyz"

1792

"0123456789"

1793

"_.-");

1794

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

1795

/* Contains non-allowed characters */

1796

if(debug){

1797

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

1798

direntry->d_name);

1799

}

1800

return 0;

1801

}

1802

1803

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

1804

if(ret == -1){

1805

if(debug){

1806

perror_plus("Could not stat hook");

1807

}

1808

return 0;

1809

}

1810

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

1811

/* Not a regular file */

1812

if(debug){

1813

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

1814

direntry->d_name);

1815

}

1816

return 0;

1817

}

1818

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

1819

/* Not executable */

1820

if(debug){

1821

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

1822

direntry->d_name);

1823

}

1824

return 0;

1825

}

1826

if(debug){

1827

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

1828

direntry->d_name);

1829

}

1830

return 1;

1831

}

1832

1833

__attribute__((nonnull, warn_unused_result))

1834

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1835

mandos_context *mc){

1203

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1836

1204

int ret;

1837

1205

struct timespec now;

1838

1206

struct timespec waited_time;

1839

1207

intmax_t block_time;

1840

1208

1841

1209

while(true){

1842

if(mc->current_server == NULL){

1843

if(debug){

1844

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

1845

" No timeout!\n");

1210

if(mc.current_server == NULL){

1211

if (debug){

1212

fprintf(stderr,

1213

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

1846

1214

}

1847

1215

ret = avahi_simple_poll_iterate(s, -1);

1848

1216

} else {

1849

if(debug){

1850

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

1851

" it, or wait\n");

1217

if (debug){

1218

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

1219

" or wait\n");

1852

1220

}

1853

1221

/* the current time */

1854

1222

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1859

1227

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

1860

1228

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

1861

1229

waited_time.tv_sec = (now.tv_sec

1862

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

1230

- mc.current_server->last_seen.tv_sec);

1863

1231

waited_time.tv_nsec = (now.tv_nsec

1864

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

1232

- mc.current_server->last_seen.tv_nsec);

1865

1233

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

1866

1234

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

1867

1235

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

1868

1236

block_time = ((retry_interval

1869

1237

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

1870

1238

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

1871

1872

if(debug){

1873

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

1874

block_time);

1239

1240

if (debug){

1241

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

1875

1242

}

1876

1243

1877

1244

if(block_time <= 0){

1878

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

1879

mc->current_server->port,

1880

mc->current_server->if_index,

1881

mc->current_server->af, mc);

1245

ret = start_mandos_communication(mc.current_server->ip,

1246

mc.current_server->port,

1247

mc.current_server->if_index,

1248

mc.current_server->af);

1882

1249

if(ret == 0){

1883

avahi_simple_poll_quit(s);

1250

avahi_simple_poll_quit(mc.simple_poll);

1884

1251

return 0;

1885

1252

}

1886

1253

ret = clock_gettime(CLOCK_MONOTONIC,

1887

&mc->current_server->last_seen);

1254

&mc.current_server->last_seen);

1888

1255

if(ret == -1){

1889

1256

perror_plus("clock_gettime");

1890

1257

return -1;

1891

1258

}

1892

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

1259

mc.current_server = mc.current_server->next;

1893

1260

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

1894

1261

servers, but don't block */

1895

1262

}

1897

1264

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

1898

1265

}

1899

1266

if(ret != 0){

1900

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

1267

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

1901

1268

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

1902

1269

}

1903

1270

}

1904

1271

}

1905

1272

}

1906

1273

1907

__attribute__((nonnull))

1908

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

1909

const float delay){

1910

struct dirent **direntries = NULL;

1911

if(hookdir_fd == -1){

1912

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1913

| O_CLOEXEC);

1914

if(hookdir_fd == -1){

1915

if(errno == ENOENT){

1916

if(debug){

1917

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

1918

" found\n", hookdir);

1919

}

1920

} else {

1921

perror_plus("open");

1922

}

1923

return;

1924

}

1925

}

1926

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

1927

runnable_hook, alphasort);

1928

if(numhooks == -1){

1929

perror_plus("scandir");

1930

return;

1931

}

1932

struct dirent *direntry;

1933

int ret;

1934

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

1935

if(devnull == -1){

1936

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

1937

return;

1938

}

1939

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

1940

direntry = direntries[i];

1941

if(debug){

1942

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

1943

direntry->d_name);

1944

}

1945

pid_t hook_pid = fork();

1946

if(hook_pid == 0){

1947

/* Child */

1948

/* Raise privileges */

1949

errno = raise_privileges_permanently();

1950

if(errno != 0){

1951

perror_plus("Failed to raise privileges");

1952

_exit(EX_NOPERM);

1953

}

1954

/* Set group */

1955

errno = 0;

1956

ret = setgid(0);

1957

if(ret == -1){

1958

perror_plus("setgid");

1959

_exit(EX_NOPERM);

1960

}

1961

/* Reset supplementary groups */

1962

errno = 0;

1963

ret = setgroups(0, NULL);

1964

if(ret == -1){

1965

perror_plus("setgroups");

1966

_exit(EX_NOPERM);

1967

}

1968

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

1969

if(ret == -1){

1970

perror_plus("setenv");

1971

_exit(EX_OSERR);

1972

}

1973

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

1974

if(ret == -1){

1975

perror_plus("setenv");

1976

_exit(EX_OSERR);

1977

}

1978

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

1979

if(ret == -1){

1980

perror_plus("setenv");

1981

_exit(EX_OSERR);

1982

}

1983

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

1984

if(ret == -1){

1985

perror_plus("setenv");

1986

_exit(EX_OSERR);

1987

}

1988

char *delaystring;

1989

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

1990

if(ret == -1){

1991

perror_plus("asprintf");

1992

_exit(EX_OSERR);

1993

}

1994

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

1995

if(ret == -1){

1996

free(delaystring);

1997

perror_plus("setenv");

1998

_exit(EX_OSERR);

1999

}

2000

free(delaystring);

2001

if(connect_to != NULL){

2002

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

2003

if(ret == -1){

2004

perror_plus("setenv");

2005

_exit(EX_OSERR);

2006

}

2007

}

2008

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

2009

direntry->d_name,

2010

O_RDONLY));

2011

if(hook_fd == -1){

2012

perror_plus("openat");

2013

_exit(EXIT_FAILURE);

2014

}

2015

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

2016

perror_plus("close");

2017

_exit(EXIT_FAILURE);

2018

}

2019

ret = dup2(devnull, STDIN_FILENO);

2020

if(ret == -1){

2021

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

2022

_exit(EX_OSERR);

2023

}

2024

ret = close(devnull);

2025

if(ret == -1){

2026

perror_plus("close");

2027

_exit(EX_OSERR);

2028

}

2029

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2030

if(ret == -1){

2031

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

2032

_exit(EX_OSERR);

2033

}

2034

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

2035

environ) == -1){

2036

perror_plus("fexecve");

2037

_exit(EXIT_FAILURE);

2038

}

2039

} else {

2040

if(hook_pid == -1){

2041

perror_plus("fork");

2042

free(direntry);

2043

continue;

2044

}

2045

int status;

2046

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

2047

perror_plus("waitpid");

2048

free(direntry);

2049

continue;

2050

}

2051

if(WIFEXITED(status)){

2052

if(WEXITSTATUS(status) != 0){

2053

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

2054

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

2055

WEXITSTATUS(status));

2056

free(direntry);

2057

continue;

2058

}

2059

} else if(WIFSIGNALED(status)){

2060

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

2061

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

2062

WTERMSIG(status));

2063

free(direntry);

2064

continue;

2065

} else {

2066

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

2067

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

2068

free(direntry);

2069

continue;

2070

}

2071

}

2072

if(debug){

2073

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

2074

direntry->d_name);

2075

}

2076

free(direntry);

2077

}

2078

free(direntries);

2079

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

2080

perror_plus("close");

2081

} else {

2082

hookdir_fd = -1;

2083

}

2084

close(devnull);

2085

}

2086

2087

__attribute__((nonnull, warn_unused_result))

2088

int bring_up_interface(const char *const interface,

2089

const float delay){

2090

int old_errno = errno;

2091

int ret;

2092

struct ifreq network;

2093

unsigned int if_index = if_nametoindex(interface);

2094

if(if_index == 0){

2095

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

2096

errno = old_errno;

2097

return ENXIO;

2098

}

2099

2100

if(quit_now){

2101

errno = old_errno;

2102

return EINTR;

2103

}

2104

2105

if(not interface_is_up(interface)){

2106

int ret_errno = 0;

2107

int ioctl_errno = 0;

2108

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

2109

ret_errno = errno;

2110

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

2111

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

2112

errno = old_errno;

2113

return ret_errno;

2114

}

2115

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

2116

2117

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

2118

if(sd == -1){

2119

ret_errno = errno;

2120

perror_plus("socket");

2121

errno = old_errno;

2122

return ret_errno;

2123

}

2124

2125

if(quit_now){

2126

ret = close(sd);

2127

if(ret == -1){

2128

perror_plus("close");

2129

}

2130

errno = old_errno;

2131

return EINTR;

2132

}

2133

2134

if(debug){

2135

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

2136

interface);

2137

}

2138

2139

/* Raise privileges */

2140

ret_errno = raise_privileges();

2141

if(ret_errno != 0){

2142

errno = ret_errno;

2143

perror_plus("Failed to raise privileges");

2144

}

2145

2146

#ifdef __linux__

2147

int ret_linux;

2148

bool restore_loglevel = false;

2149

if(ret_errno == 0){

2150

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2151

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

2152

ret_linux = klogctl(8, NULL, 5);

2153

if(ret_linux == -1){

2154

perror_plus("klogctl");

2155

} else {

2156

restore_loglevel = true;

2157

}

2158

}

2159

#endif /* __linux__ */

2160

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

2161

ioctl_errno = errno;

2162

#ifdef __linux__

2163

if(restore_loglevel){

2164

ret_linux = klogctl(7, NULL, 0);

2165

if(ret_linux == -1){

2166

perror_plus("klogctl");

2167

}

2168

}

2169

#endif /* __linux__ */

2170

2171

/* If raise_privileges() succeeded above */

2172

if(ret_errno == 0){

2173

/* Lower privileges */

2174

ret_errno = lower_privileges();

2175

if(ret_errno != 0){

2176

errno = ret_errno;

2177

perror_plus("Failed to lower privileges");

2178

}

2179

}

2180

2181

/* Close the socket */

2182

ret = close(sd);

2183

if(ret == -1){

2184

perror_plus("close");

2185

}

2186

2187

if(ret_setflags == -1){

2188

errno = ioctl_errno;

2189

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2190

errno = old_errno;

2191

return ioctl_errno;

2192

}

2193

} else if(debug){

2194

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

2195

interface);

2196

}

2197

2198

/* Sleep checking until interface is running.

2199

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

2200

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

2201

if(interface_is_running(interface)){

2202

break;

2203

}

2204

struct timespec sleeptime = { .tv_nsec = 250000000 };

2205

ret = nanosleep(&sleeptime, NULL);

2206

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

2207

perror_plus("nanosleep");

2208

}

2209

}

2210

2211

errno = old_errno;

2212

return 0;

2213

}

2214

2215

__attribute__((nonnull, warn_unused_result))

2216

int take_down_interface(const char *const interface){

2217

int old_errno = errno;

2218

struct ifreq network;

2219

unsigned int if_index = if_nametoindex(interface);

2220

if(if_index == 0){

2221

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

2222

errno = old_errno;

2223

return ENXIO;

2224

}

2225

if(interface_is_up(interface)){

2226

int ret_errno = 0;

2227

int ioctl_errno = 0;

2228

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

2229

ret_errno = errno;

2230

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

2231

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

2232

errno = old_errno;

2233

return ret_errno;

2234

}

2235

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

2236

2237

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

2238

if(sd == -1){

2239

ret_errno = errno;

2240

perror_plus("socket");

2241

errno = old_errno;

2242

return ret_errno;

2243

}

2244

2245

if(debug){

2246

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

2247

interface);

2248

}

2249

2250

/* Raise privileges */

2251

ret_errno = raise_privileges();

2252

if(ret_errno != 0){

2253

errno = ret_errno;

2254

perror_plus("Failed to raise privileges");

2255

}

2256

2257

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

2258

ioctl_errno = errno;

2259

2260

/* If raise_privileges() succeeded above */

2261

if(ret_errno == 0){

2262

/* Lower privileges */

2263

ret_errno = lower_privileges();

2264

if(ret_errno != 0){

2265

errno = ret_errno;

2266

perror_plus("Failed to lower privileges");

2267

}

2268

}

2269

2270

/* Close the socket */

2271

int ret = close(sd);

2272

if(ret == -1){

2273

perror_plus("close");

2274

}

2275

2276

if(ret_setflags == -1){

2277

errno = ioctl_errno;

2278

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2279

errno = old_errno;

2280

return ioctl_errno;

2281

}

2282

} else if(debug){

2283

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

2284

interface);

2285

}

2286

2287

errno = old_errno;

2288

return 0;

2289

}

2290

2291

1274

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

2292

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

2293

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

2294

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

2295

.current_server = NULL, .interfaces = NULL,

2296

.interfaces_size = 0 };

2297

1275

AvahiSServiceBrowser *sb = NULL;

2298

error_t ret_errno;

1276

int error;

2299

1277

int ret;

2300

1278

intmax_t tmpmax;

2301

1279

char *tmp;

2302

1280

int exitcode = EXIT_SUCCESS;

2303

char *interfaces_to_take_down = NULL;

2304

size_t interfaces_to_take_down_size = 0;

2305

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

2306

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

2307

char *tempdir = NULL;

1281

const char *interface = "";

1282

struct ifreq network;

1283

int sd = -1;

1284

bool take_down_interface = false;

1285

uid_t uid;

1286

gid_t gid;

1287

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

1288

bool tempdir_created = false;

2308

1289

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2309

1290

const char *seckey = PATHDIR "/" SECKEY;

2310

1291

const char *pubkey = PATHDIR "/" PUBKEY;

2311

const char *dh_params_file = NULL;

2312

char *interfaces_hooks = NULL;

2313

1292

2314

1293

bool gnutls_initialized = false;

2315

1294

bool gpgme_initialized = false;

2367

1346

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

2368

1347

" Diffie-Hellman key exchange",

2369

1348

.group = 2 },

2370

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

2371

.arg = "FILE",

2372

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

2373

" for the Diffie-Hellman key exchange",

2374

.group = 2 },

2375

1349

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

2376

1350

.arg = "STRING",

2377

1351

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

2382

1356

.group = 2 },

2383

1357

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

2384

1358

.arg = "SECONDS",

2385

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

2386

.group = 2 },

2387

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

2388

.arg = "DIR",

2389

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

1359

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

2390

1360

.group = 2 },

2391

1361

/*

2392

1362

* These reproduce what we would get without ARGP_NO_HELP

2411

1381

connect_to = arg;

2412

1382

break;

2413

1383

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

2414

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

2415

arg, (int)',');

2416

if(ret_errno != 0){

2417

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

2418

}

1384

interface = arg;

2419

1385

break;

2420

1386

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

2421

1387

seckey = arg;

2432

1398

}

2433

1399

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

2434

1400

break;

2435

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

2436

dh_params_file = arg;

2437

break;

2438

1401

case 130: /* --priority */

2439

1402

mc.priority = arg;

2440

1403

break;

2448

1411

errno = 0;

2449

1412

retry_interval = strtod(arg, &tmp);

2450

1413

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

2451

or (retry_interval * 1000) > INT_MAX

2452

or retry_interval < 0){

1414

or (retry_interval * 1000) > INT_MAX){

2453

1415

argp_error(state, "Bad retry interval");

2454

1416

}

2455

1417

break;

2456

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

2457

hookdir = arg;

2458

break;

2459

1418

/*

2460

1419

* These reproduce what we would get without ARGP_NO_HELP

2461

1420

*/

2467

1426

argp_state_help(state, state->out_stream,

2468

1427

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

2469

1428

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

2470

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

1429

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

2471

1430

exit(argp_err_exit_status);

2472

1431

break;

2473

1432

default:

2480

1439

.args_doc = "",

2481

1440

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

2482

1441

" passwords from a Mandos server" };

2483

ret_errno = argp_parse(&argp, argc, argv,

2484

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2485

switch(ret_errno){

1442

ret = argp_parse(&argp, argc, argv,

1443

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1444

switch(ret){

2486

1445

case 0:

2487

1446

break;

2488

1447

case ENOMEM:

2489

1448

default:

2490

errno = ret_errno;

1449

errno = ret;

2491

1450

perror_plus("argp_parse");

2492

1451

exitcode = EX_OSERR;

2493

1452

goto end;

2497

1456

}

2498

1457

}

2499

1458

2500

{

2501

/* Work around Debian bug #633582:

2502

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

2503

2504

/* Re-raise privileges */

2505

ret = raise_privileges();

2506

if(ret != 0){

2507

errno = ret;

2508

perror_plus("Failed to raise privileges");

2509

} else {

2510

struct stat st;

2511

2512

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

2513

int seckey_fd = open(seckey, O_RDONLY);

2514

if(seckey_fd == -1){

2515

perror_plus("open");

2516

} else {

2517

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

2518

if(ret == -1){

2519

perror_plus("fstat");

2520

} else {

2521

if(S_ISREG(st.st_mode)

2522

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

2523

ret = fchown(seckey_fd, uid, gid);

2524

if(ret == -1){

2525

perror_plus("fchown");

2526

}

2527

}

2528

}

2529

close(seckey_fd);

2530

}

2531

}

2532

2533

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

2534

int pubkey_fd = open(pubkey, O_RDONLY);

2535

if(pubkey_fd == -1){

2536

perror_plus("open");

2537

} else {

2538

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

2539

if(ret == -1){

2540

perror_plus("fstat");

2541

} else {

2542

if(S_ISREG(st.st_mode)

2543

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

2544

ret = fchown(pubkey_fd, uid, gid);

2545

if(ret == -1){

2546

perror_plus("fchown");

2547

}

2548

}

2549

}

2550

close(pubkey_fd);

2551

}

2552

}

2553

2554

if(dh_params_file != NULL

2555

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

2556

int dhparams_fd = open(dh_params_file, O_RDONLY);

2557

if(dhparams_fd == -1){

2558

perror_plus("open");

2559

} else {

2560

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

2561

if(ret == -1){

2562

perror_plus("fstat");

2563

} else {

2564

if(S_ISREG(st.st_mode)

2565

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

2566

ret = fchown(dhparams_fd, uid, gid);

2567

if(ret == -1){

2568

perror_plus("fchown");

2569

}

2570

}

2571

}

2572

close(dhparams_fd);

2573

}

2574

}

2575

2576

/* Lower privileges */

2577

ret = lower_privileges();

2578

if(ret != 0){

2579

errno = ret;

2580

perror_plus("Failed to lower privileges");

2581

}

2582

}

2583

}

2584

2585

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

2586

{

2587

char *interface = NULL;

2588

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

2589

interface))){

2590

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

2591

and if_nametoindex(interface) == 0){

2592

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

2593

fprintf_plus(stderr, "Not using nonexisting interface"

2594

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

2595

}

2596

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

2597

interface = NULL;

2598

}

2599

}

2600

}

2601

2602

/* Run network hooks */

2603

{

2604

if(mc.interfaces != NULL){

2605

interfaces_hooks = malloc(mc.interfaces_size);

2606

if(interfaces_hooks == NULL){

2607

perror_plus("malloc");

2608

goto end;

2609

}

2610

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

2611

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

2612

}

2613

run_network_hooks("start", interfaces_hooks != NULL ?

2614

interfaces_hooks : "", delay);

2615

}

2616

2617

1459

if(not debug){

2618

1460

avahi_set_log_function(empty_log);

2619

1461

}

1462

1463

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

1464

struct dirent **direntries;

1465

ret = scandir(sys_class_net, &direntries, good_interface,

1466

alphasort);

1467

if(ret >= 1){

1468

/* Pick the first good interface */

1469

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

1470

if(debug){

1471

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

1472

}

1473

if(interface == NULL){

1474

perror_plus("malloc");

1475

free(direntries);

1476

exitcode = EXIT_FAILURE;

1477

goto end;

1478

}

1479

free(direntries);

1480

} else {

1481

free(direntries);

1482

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

1483

exitcode = EXIT_FAILURE;

1484

goto end;

1485

}

1486

}

2620

1487

2621

1488

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

2622

1489

from the signal handler */

2623

1490

/* Initialize the pseudo-RNG for Avahi */

2624

1491

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

2625

simple_poll = avahi_simple_poll_new();

2626

if(simple_poll == NULL){

2627

fprintf_plus(stderr,

2628

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

1492

mc.simple_poll = avahi_simple_poll_new();

1493

if(mc.simple_poll == NULL){

1494

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

2629

1495

exitcode = EX_UNAVAILABLE;

2630

1496

goto end;

2631

1497

}

2693

1559

}

2694

1560

}

2695

1561

2696

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

2697

if(mc.interfaces == NULL){

2698

struct dirent **direntries = NULL;

2699

/* Look for any good interfaces */

2700

ret = scandir(sys_class_net, &direntries, good_interface,

2701

alphasort);

2702

if(ret >= 1){

2703

/* Add all found interfaces to interfaces list */

2704

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

2705

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

2706

direntries[i]->d_name);

2707

if(ret_errno != 0){

2708

errno = ret_errno;

2709

perror_plus("argz_add");

2710

free(direntries[i]);

2711

continue;

2712

}

2713

if(debug){

2714

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

2715

direntries[i]->d_name);

2716

}

2717

free(direntries[i]);

2718

}

2719

free(direntries);

1562

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

1563

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

1564

if_index = (AvahiIfIndex) if_nametoindex(interface);

1565

if(if_index == 0){

1566

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

1567

exitcode = EX_UNAVAILABLE;

1568

goto end;

1569

}

1570

1571

if(quit_now){

1572

goto end;

1573

}

1574

1575

/* Re-raise priviliges */

1576

errno = 0;

1577

ret = seteuid(0);

1578

if(ret == -1){

1579

perror_plus("seteuid");

1580

}

1581

1582

#ifdef __linux__

1583

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1584

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

1585

ret = klogctl(8, NULL, 5);

1586

bool restore_loglevel = true;

1587

if(ret == -1){

1588

restore_loglevel = false;

1589

perror_plus("klogctl");

1590

}

1591

#endif /* __linux__ */

1592

1593

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1594

if(sd < 0){

1595

perror_plus("socket");

1596

exitcode = EX_OSERR;

1597

#ifdef __linux__

1598

if(restore_loglevel){

1599

ret = klogctl(7, NULL, 0);

1600

if(ret == -1){

1601

perror_plus("klogctl");

1602

}

1603

}

1604

#endif /* __linux__ */

1605

/* Lower privileges */

1606

errno = 0;

1607

ret = seteuid(uid);

1608

if(ret == -1){

1609

perror_plus("seteuid");

1610

}

1611

goto end;

1612

}

1613

strcpy(network.ifr_name, interface);

1614

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

1615

if(ret == -1){

1616

perror_plus("ioctl SIOCGIFFLAGS");

1617

#ifdef __linux__

1618

if(restore_loglevel){

1619

ret = klogctl(7, NULL, 0);

1620

if(ret == -1){

1621

perror_plus("klogctl");

1622

}

1623

}

1624

#endif /* __linux__ */

1625

exitcode = EX_OSERR;

1626

/* Lower privileges */

1627

errno = 0;

1628

ret = seteuid(uid);

1629

if(ret == -1){

1630

perror_plus("seteuid");

1631

}

1632

goto end;

1633

}

1634

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

1635

network.ifr_flags |= IFF_UP;

1636

take_down_interface = true;

1637

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

1638

if(ret == -1){

1639

take_down_interface = false;

1640

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1641

exitcode = EX_OSERR;

1642

#ifdef __linux__

1643

if(restore_loglevel){

1644

ret = klogctl(7, NULL, 0);

1645

if(ret == -1){

1646

perror_plus("klogctl");

1647

}

1648

}

1649

#endif /* __linux__ */

1650

/* Lower privileges */

1651

errno = 0;

1652

ret = seteuid(uid);

1653

if(ret == -1){

1654

perror_plus("seteuid");

1655

}

1656

goto end;

1657

}

1658

}

1659

/* Sleep checking until interface is running.

1660

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

1661

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

1662

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

1663

if(ret == -1){

1664

perror_plus("ioctl SIOCGIFFLAGS");

1665

} else if(network.ifr_flags & IFF_RUNNING){

1666

break;

1667

}

1668

struct timespec sleeptime = { .tv_nsec = 250000000 };

1669

ret = nanosleep(&sleeptime, NULL);

1670

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

1671

perror_plus("nanosleep");

1672

}

1673

}

1674

if(not take_down_interface){

1675

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

1676

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

1677

if(ret == -1){

1678

perror_plus("close");

1679

}

1680

}

1681

#ifdef __linux__

1682

if(restore_loglevel){

1683

/* Restores kernel loglevel to default */

1684

ret = klogctl(7, NULL, 0);

1685

if(ret == -1){

1686

perror_plus("klogctl");

1687

}

1688

}

1689

#endif /* __linux__ */

1690

/* Lower privileges */

1691

errno = 0;

1692

if(take_down_interface){

1693

/* Lower privileges */

1694

ret = seteuid(uid);

1695

if(ret == -1){

1696

perror_plus("seteuid");

1697

}

2720

1698

} else {

2721

if(ret == 0){

2722

free(direntries);

2723

}

2724

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

2725

exitcode = EXIT_FAILURE;

2726

goto end;

2727

}

2728

}

2729

2730

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

2731

{

2732

char *interface = NULL;

2733

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

2734

interface))){

2735

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

2736

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

2737

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

2738

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

2739

interface);

2740

interface = NULL;

2741

while((interface = argz_next(mc.interfaces,

2742

mc.interfaces_size, interface))){

2743

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

2744

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

2745

interface);

2746

interface = NULL;

2747

}

2748

}

2749

break;

2750

}

2751

bool interface_was_up = interface_is_up(interface);

2752

errno = bring_up_interface(interface, delay);

2753

if(not interface_was_up){

2754

if(errno != 0){

2755

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

2756

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

2757

} else {

2758

errno = argz_add(&interfaces_to_take_down,

2759

&interfaces_to_take_down_size,

2760

interface);

2761

if(errno != 0){

2762

perror_plus("argz_add");

2763

}

2764

}

2765

}

2766

}

2767

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

2768

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

2769

}

2770

}

2771

2772

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

2773

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

2774

if(debug){

2775

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

2776

mc.interfaces);

2777

}

2778

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

1699

/* Lower privileges permanently */

1700

ret = setuid(uid);

1701

if(ret == -1){

1702

perror_plus("setuid");

1703

}

1704

}

2779

1705

}

2780

1706

2781

1707

if(quit_now){

2782

1708

goto end;

2783

1709

}

2784

1710

2785

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

1711

ret = init_gnutls_global(pubkey, seckey);

2786

1712

if(ret == -1){

2787

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

1713

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

2788

1714

exitcode = EX_UNAVAILABLE;

2789

1715

goto end;

2790

1716

} else {

2795

1721

goto end;

2796

1722

}

2797

1723

2798

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

2799

tempdir = mkdtemp(run_tempdir);

2800

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

2801

if(debug){

2802

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

2803

run_tempdir, old_tempdir);

2804

}

2805

tempdir = mkdtemp(old_tempdir);

2806

}

2807

if(tempdir == NULL){

1724

if(mkdtemp(tempdir) == NULL){

2808

1725

perror_plus("mkdtemp");

2809

1726

goto end;

2810

1727

}

1728

tempdir_created = true;

2811

1729

2812

1730

if(quit_now){

2813

1731

goto end;

2814

1732

}

2815

1733

2816

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

2817

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

1734

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

1735

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

2818

1736

exitcode = EX_UNAVAILABLE;

2819

1737

goto end;

2820

1738

} else {

2829

1747

/* Connect directly, do not use Zeroconf */

2830

1748

/* (Mainly meant for debugging) */

2831

1749

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

2832

2833

1750

if(address == NULL){

2834

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

1751

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

2835

1752

exitcode = EX_USAGE;

2836

1753

goto end;

2837

1754

}

2840

1757

goto end;

2841

1758

}

2842

1759

2843

in_port_t port;

1760

uint16_t port;

2844

1761

errno = 0;

2845

1762

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

2846

1763

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

2847

or tmpmax != (in_port_t)tmpmax){

2848

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

1764

or tmpmax != (uint16_t)tmpmax){

1765

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

2849

1766

exitcode = EX_USAGE;

2850

1767

goto end;

2851

1768

}

2852

1769

2853

1770

if(quit_now){

2854

1771

goto end;

2855

1772

}

2856

1773

2857

port = (in_port_t)tmpmax;

1774

port = (uint16_t)tmpmax;

2858

1775

*address = '\0';

1776

address = connect_to;

2859

1777

/* Colon in address indicates IPv6 */

2860

1778

int af;

2861

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

1779

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

2862

1780

af = AF_INET6;

2863

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

2864

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

2865

{

2866

connect_to++;

2867

address[-1] = '\0';

2868

}

2869

1781

} else {

2870

1782

af = AF_INET;

2871

1783

}

2872

address = connect_to;

2873

1784

2874

1785

if(quit_now){

2875

1786

goto end;

2876

1787

}

2877

1788

2878

1789

while(not quit_now){

2879

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

2880

&mc);

1790

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

2881

1791

if(quit_now or ret == 0){

2882

1792

break;

2883

1793

}

2884

if(debug){

2885

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

2886

(int)retry_interval);

2887

}

2888

sleep((unsigned int)retry_interval);

2889

}

2890

2891

if(not quit_now){

1794

sleep((int)retry_interval or 1);

1795

};

1796

1797

if (not quit_now){

2892

1798

exitcode = EXIT_SUCCESS;

2893

1799

}

2894

1800

2895

1801

goto end;

2896

1802

}

2897

1803

2909

1815

config.publish_domain = 0;

2910

1816

2911

1817

/* Allocate a new server */

2912

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2913

&config, NULL, NULL, &ret);

1818

mc.server = avahi_server_new(avahi_simple_poll_get

1819

(mc.simple_poll), &config, NULL,

1820

NULL, &error);

2914

1821

2915

1822

/* Free the Avahi configuration data */

2916

1823

avahi_server_config_free(&config);

2918

1825

2919

1826

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

2920

1827

if(mc.server == NULL){

2921

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

2922

avahi_strerror(ret));

1828

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

1829

avahi_strerror(error));

2923

1830

exitcode = EX_UNAVAILABLE;

2924

1831

goto end;

2925

1832

}

2931

1838

/* Create the Avahi service browser */

2932

1839

sb = avahi_s_service_browser_new(mc.server, if_index,

2933

1840

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2934

NULL, 0, browse_callback,

2935

(void *)&mc);

1841

NULL, 0, browse_callback, NULL);

2936

1842

if(sb == NULL){

2937

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

2938

avahi_strerror(avahi_server_errno(mc.server)));

1843

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

1844

avahi_strerror(avahi_server_errno(mc.server)));

2939

1845

exitcode = EX_UNAVAILABLE;

2940

1846

goto end;

2941

1847

}

2947

1853

/* Run the main loop */

2948

1854

2949

1855

if(debug){

2950

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

1856

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

2951

1857

}

2952

2953

ret = avahi_loop_with_timeout(simple_poll,

2954

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

1858

1859

ret = avahi_loop_with_timeout(mc.simple_poll,

1860

(int)(retry_interval * 1000));

2955

1861

if(debug){

2956

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

2957

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

1862

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

1863

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

2958

1864

}

2959

1865

2960

1866

end:

2961

1867

2962

1868

if(debug){

2963

if(signal_received){

2964

fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",

2965

argv[0], signal_received,

2966

strsignal(signal_received));

2967

} else {

2968

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

2969

}

1869

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

2970

1870

}

2971

1871

2972

1872

/* Cleanup things */

2973

free(mc.interfaces);

2974

2975

1873

if(sb != NULL)

2976

1874

avahi_s_service_browser_free(sb);

2977

1875

2978

1876

if(mc.server != NULL)

2979

1877

avahi_server_free(mc.server);

2980

1878

2981

if(simple_poll != NULL)

2982

avahi_simple_poll_free(simple_poll);

1879

if(mc.simple_poll != NULL)

1880

avahi_simple_poll_free(mc.simple_poll);

2983

1881

2984

1882

if(gnutls_initialized){

2985

1883

gnutls_certificate_free_credentials(mc.cred);

1884

gnutls_global_deinit();

2986

1885

gnutls_dh_params_deinit(mc.dh_params);

2987

1886

}

2988

1887

2989

1888

if(gpgme_initialized){

2990

1889

gpgme_release(mc.ctx);

2991

1890

}

2992

1891

2993

1892

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

2994

1893

has seen */

2995

1894

if(mc.current_server != NULL){

2996

1895

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

2997

1896

while(mc.current_server != NULL){

2998

1897

server *next = mc.current_server->next;

2999

#ifdef __GNUC__

3000

#pragma GCC diagnostic push

3001

#pragma GCC diagnostic ignored "-Wcast-qual"

3002

#endif

3003

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

3004

#ifdef __GNUC__

3005

#pragma GCC diagnostic pop

3006

#endif

3007

1898

free(mc.current_server);

3008

1899

mc.current_server = next;

3009

1900

}

3010

1901

}

3011

1902

3012

/* Re-raise privileges */

3013

{

3014

ret = raise_privileges();

3015

if(ret != 0){

3016

errno = ret;

3017

perror_plus("Failed to raise privileges");

3018

} else {

3019

3020

/* Run network hooks */

3021

run_network_hooks("stop", interfaces_hooks != NULL ?

3022

interfaces_hooks : "", delay);

3023

3024

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

3025

{

3026

char *interface = NULL;

3027

while((interface = argz_next(interfaces_to_take_down,

3028

interfaces_to_take_down_size,

3029

interface))){

3030

ret = take_down_interface(interface);

3031

if(ret != 0){

3032

errno = ret;

3033

perror_plus("Failed to take down interface");

3034

}

3035

}

3036

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

3037

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

3038

" down\n");

3039

}

3040

}

3041

}

3042

3043

ret = lower_privileges_permanently();

3044

if(ret != 0){

3045

errno = ret;

3046

perror_plus("Failed to lower privileges permanently");

3047

}

3048

}

3049

3050

free(interfaces_to_take_down);

3051

free(interfaces_hooks);

3052

3053

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

3054

uintmax_t level){

3055

struct dirent **direntries = NULL;

3056

int dret;

3057

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

3058

O_RDONLY

3059

| O_NOFOLLOW

3060

| O_DIRECTORY

3061

| O_PATH));

3062

if(dir_fd == -1){

3063

perror_plus("open");

3064

}

3065

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

3066

notdotentries, alphasort);

3067

if(numentries >= 0){

3068

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

3069

if(debug){

3070

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

3071

dirname, direntries[i]->d_name);

3072

}

3073

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

3074

if(dret == -1){

3075

if(errno == EISDIR){

3076

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

3077

AT_REMOVEDIR);

3078

}

3079

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

3080

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

3081

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

3082

/* Recurse only in this special case */

3083

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

3084

dret = 0;

3085

}

3086

if(dret == -1){

3087

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

3088

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

3089

}

3090

}

3091

free(direntries[i]);

3092

}

3093

3094

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

3095

free(direntries);

3096

if(numentries == -1){

3097

perror_plus("scandirat");

3098

}

3099

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3100

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

3101

perror_plus("rmdir");

3102

}

3103

} else {

3104

perror_plus("scandirat");

3105

}

3106

close(dir_fd);

1903

/* Take down the network interface */

1904

if(take_down_interface){

1905

/* Re-raise priviliges */

1906

errno = 0;

1907

ret = seteuid(0);

1908

if(ret == -1){

1909

perror_plus("seteuid");

1910

}

1911

if(geteuid() == 0){

1912

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

1913

if(ret == -1){

1914

perror_plus("ioctl SIOCGIFFLAGS");

1915

} else if(network.ifr_flags & IFF_UP) {

1916

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

1917

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

1918

if(ret == -1){

1919

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1920

}

1921

}

1922

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

1923

if(ret == -1){

1924

perror_plus("close");

1925

}

1926

/* Lower privileges permanently */

1927

errno = 0;

1928

ret = setuid(uid);

1929

if(ret == -1){

1930

perror_plus("setuid");

1931

}

1932

}

3107

1933

}

3108

1934

3109

1935

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

3110

if(tempdir != NULL){

3111

clean_dir_at(-1, tempdir, 0);

1936

if(tempdir_created){

1937

struct dirent **direntries = NULL;

1938

struct dirent *direntry = NULL;

1939

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

1940

if (ret > 0){

1941

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

1942

direntry = direntries[i];

1943

char *fullname = NULL;

1944

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

1945

direntry->d_name);

1946

if(ret < 0){

1947

perror_plus("asprintf");

1948

continue;

1949

}

1950

ret = remove(fullname);

1951

if(ret == -1){

1952

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

1953

strerror(errno));

1954

}

1955

free(fullname);

1956

}

1957

}

1958

1959

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

1960

specify */

1961

free(direntries);

1962

if (ret == -1){

1963

perror_plus("scandir");

1964

}

1965

ret = rmdir(tempdir);

1966

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

1967

perror_plus("rmdir");

1968

}

3112

1969

}

3113

1970

3114

1971

if(quit_now){