/mandos/release : revision 237.16.2

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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 file is part of Mandos.

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*

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* Mandos is free software: you can redistribute it and/or modify it

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* under the terms of the GNU General Public License as published by

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* the Free Software Foundation, either version 3 of the License, or

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* (at your option) any later version.

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*

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* Mandos is distributed in the hope that it will be useful, but

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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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* published by the Free Software Foundation, either version 3 of the

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* License, or (at your option) any later version.

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*

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* This program is distributed in the hope that it will be useful, but

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* WITHOUT ANY WARRANTY; without even the implied warranty of

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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

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* General Public License for more details.

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*

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* You should have received a copy of the GNU General Public License

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* along with Mandos. If not, see <http://www.gnu.org/licenses/>.

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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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*/

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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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opendir(), DIR */

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

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

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inet_pton(), connect(),

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

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

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char *connect_to = NULL;

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const char *hookdir = HOOKDIR;

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int hookdir_fd = -1;

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uid_t uid = 65534;

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gid_t gid = 65534;

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

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typedef struct server{

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const char *ip;

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in_port_t port;

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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*/

180

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",

162

.current_server = NULL };

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182

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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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168

void perror_plus(const char *print_text){

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int e = errno;

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169

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

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170

program_invocation_short_name);

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errno = e;

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perror(print_text);

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}

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

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

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va_list ap;

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va_start (ap, format);

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199

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

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program_invocation_short_name));

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

202

}

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204

174

/*

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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,

207

177

* "buffer_length" is how much is already used.

208

178

*/

209

__attribute__((nonnull, warn_unused_result))

210

179

size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

180

size_t buffer_capacity){

212

181

if(buffer_length + BUFFER_SIZE > buffer_capacity){

213

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

214

if(new_buf == NULL){

215

int old_errno = errno;

216

free(*buffer);

217

errno = old_errno;

218

*buffer = NULL;

182

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

183

if(buffer == NULL){

219

184

return 0;

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185

}

221

*buffer = new_buf;

222

186

buffer_capacity += BUFFER_SIZE;

223

187

}

224

188

return buffer_capacity;

225

189

}

226

190

227

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

228

__attribute__((nonnull, warn_unused_result))

229

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

230

int af, server **current_server){

192

int add_server(const char *ip, uint16_t port,

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AvahiIfIndex if_index,

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int af){

231

195

int ret;

232

196

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

233

197

if(new_server == NULL){

234

198

perror_plus("malloc");

235

return false;

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return -1;

236

200

}

237

201

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

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.port = port,

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.if_index = if_index,

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.af = af };

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.port = port,

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.if_index = if_index,

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.af = af };

241

205

if(new_server->ip == NULL){

242

206

perror_plus("strdup");

243

free(new_server);

244

return false;

245

}

246

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

247

if(ret == -1){

248

perror_plus("clock_gettime");

249

#ifdef __GNUC__

250

#pragma GCC diagnostic push

251

#pragma GCC diagnostic ignored "-Wcast-qual"

252

#endif

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

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#ifdef __GNUC__

255

#pragma GCC diagnostic pop

256

#endif

257

free(new_server);

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return false;

207

return -1;

259

208

}

260

209

/* Special case of first server */

261

if(*current_server == NULL){

210

if (mc.current_server == NULL){

262

211

new_server->next = new_server;

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212

new_server->prev = new_server;

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*current_server = new_server;

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mc.current_server = new_server;

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

265

215

} else {

266

/* 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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}

221

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

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if(ret == -1){

223

perror_plus("clock_gettime");

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return -1;

225

}

226

return 0;

273

227

}

274

228

275

229

/*

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* Initialize GPGME.

277

231

*/

278

__attribute__((nonnull, warn_unused_result))

279

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;

284

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gpgme_engine_info_t engine_info;

285

236

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286

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/*

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

288

240

*/

289

bool import_key(const char * const filename){

241

bool import_key(const char *filename){

290

242

int ret;

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243

int fd;

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gpgme_data_t pgp_data;

299

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300

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

301

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if(rc != GPG_ERR_NO_ERROR){

302

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

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gpgme_strsource(rc), gpgme_strerror(rc));

254

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

305

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}

306

258

307

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

259

rc = gpgme_op_import(mc.ctx, pgp_data);

308

260

if(rc != GPG_ERR_NO_ERROR){

309

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

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gpgme_strsource(rc), gpgme_strerror(rc));

261

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

262

gpgme_strsource(rc), gpgme_strerror(rc));

311

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return false;

312

264

}

313

265

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ret = close(fd);

266

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

315

267

if(ret == -1){

316

268

perror_plus("close");

317

269

}

320

272

}

321

273

322

274

if(debug){

323

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

275

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

324

276

}

325

277

326

278

/* Init GPGME */

327

279

gpgme_check_version(NULL);

328

280

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

329

281

if(rc != GPG_ERR_NO_ERROR){

330

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

331

gpgme_strsource(rc), gpgme_strerror(rc));

282

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

283

gpgme_strsource(rc), gpgme_strerror(rc));

332

284

return false;

333

285

}

334

286

335

287

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

336

288

rc = gpgme_get_engine_info(&engine_info);

337

289

if(rc != GPG_ERR_NO_ERROR){

338

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

339

gpgme_strsource(rc), gpgme_strerror(rc));

290

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

291

gpgme_strsource(rc), gpgme_strerror(rc));

340

292

return false;

341

293

}

342

294

while(engine_info != NULL){

348

300

engine_info = engine_info->next;

349

301

}

350

302

if(engine_info == NULL){

351

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

352

tempdir);

303

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

353

304

return false;

354

305

}

355

306

356

307

/* Create new GPGME "context" */

357

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

308

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

358

309

if(rc != GPG_ERR_NO_ERROR){

359

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

360

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

361

gpgme_strerror(rc));

310

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

311

gpgme_strsource(rc), gpgme_strerror(rc));

362

312

return false;

363

313

}

364

314

373

323

* Decrypt OpenPGP data.

374

324

* Returns -1 on error

375

325

*/

376

__attribute__((nonnull, warn_unused_result))

377

326

static ssize_t pgp_packet_decrypt(const char *cryptotext,

378

327

size_t crypto_size,

379

char **plaintext,

380

mandos_context *mc){

328

char **plaintext){

381

329

gpgme_data_t dh_crypto, dh_plain;

382

330

gpgme_error_t rc;

383

331

ssize_t ret;

385

333

ssize_t plaintext_length = 0;

386

334

387

335

if(debug){

388

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

336

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

389

337

}

390

338

391

339

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

392

340

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

393

341

0);

394

342

if(rc != GPG_ERR_NO_ERROR){

395

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

396

gpgme_strsource(rc), gpgme_strerror(rc));

343

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

344

gpgme_strsource(rc), gpgme_strerror(rc));

397

345

return -1;

398

346

}

399

347

400

348

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

401

349

rc = gpgme_data_new(&dh_plain);

402

350

if(rc != GPG_ERR_NO_ERROR){

403

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

404

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

405

gpgme_strsource(rc), gpgme_strerror(rc));

351

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

352

gpgme_strsource(rc), gpgme_strerror(rc));

406

353

gpgme_data_release(dh_crypto);

407

354

return -1;

408

355

}

409

356

410

357

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

411

358

data buffer */

412

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

359

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

413

360

if(rc != GPG_ERR_NO_ERROR){

414

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

415

gpgme_strsource(rc), gpgme_strerror(rc));

361

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

362

gpgme_strsource(rc), gpgme_strerror(rc));

416

363

plaintext_length = -1;

417

364

if(debug){

418

365

gpgme_decrypt_result_t result;

419

result = gpgme_op_decrypt_result(mc->ctx);

366

result = gpgme_op_decrypt_result(mc.ctx);

420

367

if(result == NULL){

421

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

368

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

422

369

} else {

423

if(result->unsupported_algorithm != NULL) {

424

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

425

result->unsupported_algorithm);

426

}

427

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

428

result->wrong_key_usage ? "Yes" : "No");

370

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

371

result->unsupported_algorithm);

372

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

373

result->wrong_key_usage);

429

374

if(result->file_name != NULL){

430

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

375

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

431

376

}

432

377

gpgme_recipient_t recipient;

433

378

recipient = result->recipients;

434

379

while(recipient != NULL){

435

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

436

gpgme_pubkey_algo_name

437

(recipient->pubkey_algo));

438

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

439

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

440

recipient->status == GPG_ERR_NO_SECKEY

441

? "No" : "Yes");

380

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

381

gpgme_pubkey_algo_name(recipient->pubkey_algo));

382

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

383

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

384

recipient->status == GPG_ERR_NO_SECKEY

385

? "No" : "Yes");

442

386

recipient = recipient->next;

443

387

}

444

388

}

447

391

}

448

392

449

393

if(debug){

450

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

394

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

451

395

}

452

396

453

397

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

460

404

*plaintext = NULL;

461

405

while(true){

462

406

plaintext_capacity = incbuffer(plaintext,

463

(size_t)plaintext_length,

464

plaintext_capacity);

407

(size_t)plaintext_length,

408

plaintext_capacity);

465

409

if(plaintext_capacity == 0){

466

perror_plus("incbuffer");

467

plaintext_length = -1;

468

goto decrypt_end;

410

perror_plus("incbuffer");

411

plaintext_length = -1;

412

goto decrypt_end;

469

413

}

470

414

471

415

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

484

428

}

485

429

486

430

if(debug){

487

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

431

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

488

432

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

489

433

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

490

434

}

501

445

return plaintext_length;

502

446

}

503

447

504

__attribute__((warn_unused_result, const))

505

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

506

if(str == NULL)

507

return "(unknown)";

508

return str;

509

}

510

511

__attribute__((warn_unused_result))

512

static const char *safer_gnutls_strerror(int value){

513

const char *ret = gnutls_strerror(value);

514

return safe_string(ret);

448

static const char * safer_gnutls_strerror(int value){

449

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

450

-Wunreachable-code */

451

if(ret == NULL)

452

ret = "(unknown)";

453

return ret;

515

454

}

516

455

517

456

/* GnuTLS log function callback */

518

__attribute__((nonnull))

519

457

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

520

458

const char* string){

521

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

459

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

522

460

}

523

461

524

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

525

462

static int init_gnutls_global(const char *pubkeyfilename,

526

const char *seckeyfilename,

527

const char *dhparamsfilename,

528

mandos_context *mc){

463

const char *seckeyfilename){

529

464

int ret;

530

unsigned int uret;

531

465

532

466

if(debug){

533

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

467

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

468

}

469

470

ret = gnutls_global_init();

471

if(ret != GNUTLS_E_SUCCESS){

472

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

473

safer_gnutls_strerror(ret));

474

return -1;

534

475

}

535

476

536

477

if(debug){

542

483

}

543

484

544

485

/* OpenPGP credentials */

545

ret = gnutls_certificate_allocate_credentials(&mc->cred);

486

ret = gnutls_certificate_allocate_credentials(&mc.cred);

546

487

if(ret != GNUTLS_E_SUCCESS){

547

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

548

safer_gnutls_strerror(ret));

488

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

489

safer_gnutls_strerror(ret));

490

gnutls_global_deinit();

549

491

return -1;

550

492

}

551

493

552

494

if(debug){

553

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

554

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

555

pubkeyfilename,

556

seckeyfilename);

495

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

496

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

497

seckeyfilename);

557

498

}

558

499

559

500

ret = gnutls_certificate_set_openpgp_key_file

560

(mc->cred, pubkeyfilename, seckeyfilename,

501

(mc.cred, pubkeyfilename, seckeyfilename,

561

502

GNUTLS_OPENPGP_FMT_BASE64);

562

503

if(ret != GNUTLS_E_SUCCESS){

563

fprintf_plus(stderr,

564

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

565

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

566

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

567

safer_gnutls_strerror(ret));

504

fprintf(stderr,

505

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

506

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

507

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

508

safer_gnutls_strerror(ret));

568

509

goto globalfail;

569

510

}

570

511

571

512

/* GnuTLS server initialization */

572

ret = gnutls_dh_params_init(&mc->dh_params);

573

if(ret != GNUTLS_E_SUCCESS){

574

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

575

" initialization: %s\n",

576

safer_gnutls_strerror(ret));

577

goto globalfail;

578

}

579

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

580

if(dhparamsfilename != NULL){

581

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

582

do {

583

int dhpfile = open(dhparamsfilename, O_RDONLY);

584

if(dhpfile == -1){

585

perror_plus("open");

586

dhparamsfilename = NULL;

587

break;

588

}

589

size_t params_capacity = 0;

590

while(true){

591

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

592

(size_t)params.size,

593

(size_t)params_capacity);

594

if(params_capacity == 0){

595

perror_plus("incbuffer");

596

free(params.data);

597

params.data = NULL;

598

dhparamsfilename = NULL;

599

break;

600

}

601

ssize_t bytes_read = read(dhpfile,

602

params.data + params.size,

603

BUFFER_SIZE);

604

/* EOF */

605

if(bytes_read == 0){

606

break;

607

}

608

/* check bytes_read for failure */

609

if(bytes_read < 0){

610

perror_plus("read");

611

free(params.data);

612

params.data = NULL;

613

dhparamsfilename = NULL;

614

break;

615

}

616

params.size += (unsigned int)bytes_read;

617

}

618

ret = close(dhpfile);

619

if(ret == -1){

620

perror_plus("close");

621

}

622

if(params.data == NULL){

623

dhparamsfilename = NULL;

624

}

625

if(dhparamsfilename == NULL){

626

break;

627

}

628

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

629

GNUTLS_X509_FMT_PEM);

630

if(ret != GNUTLS_E_SUCCESS){

631

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

632

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

633

safer_gnutls_strerror(ret));

634

dhparamsfilename = NULL;

635

}

636

free(params.data);

637

} while(false);

638

}

639

if(dhparamsfilename == NULL){

640

if(mc->dh_bits == 0){

641

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

642

/* Try to read the private key file */

643

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

644

do {

645

int secfile = open(seckeyfilename, O_RDONLY);

646

if(secfile == -1){

647

perror_plus("open");

648

break;

649

}

650

size_t buffer_capacity = 0;

651

while(true){

652

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

653

(size_t)buffer.size,

654

(size_t)buffer_capacity);

655

if(buffer_capacity == 0){

656

perror_plus("incbuffer");

657

free(buffer.data);

658

buffer.data = NULL;

659

break;

660

}

661

ssize_t bytes_read = read(secfile,

662

buffer.data + buffer.size,

663

BUFFER_SIZE);

664

/* EOF */

665

if(bytes_read == 0){

666

break;

667

}

668

/* check bytes_read for failure */

669

if(bytes_read < 0){

670

perror_plus("read");

671

free(buffer.data);

672

buffer.data = NULL;

673

break;

674

}

675

buffer.size += (unsigned int)bytes_read;

676

}

677

close(secfile);

678

} while(false);

679

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

680

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

681

if(buffer.data != NULL){

682

{

683

gnutls_openpgp_privkey_t privkey = NULL;

684

ret = gnutls_openpgp_privkey_init(&privkey);

685

if(ret != GNUTLS_E_SUCCESS){

686

fprintf_plus(stderr, "Error initializing OpenPGP key"

687

" structure: %s",

688

safer_gnutls_strerror(ret));

689

free(buffer.data);

690

buffer.data = NULL;

691

} else {

692

ret = gnutls_openpgp_privkey_import

693

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

694

if(ret != GNUTLS_E_SUCCESS){

695

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

696

safer_gnutls_strerror(ret));

697

privkey = NULL;

698

}

699

free(buffer.data);

700

buffer.data = NULL;

701

if(privkey != NULL){

702

/* Use private key to suggest an appropriate

703

sec_param */

704

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

705

gnutls_openpgp_privkey_deinit(privkey);

706

if(debug){

707

fprintf_plus(stderr, "This OpenPGP key implies using"

708

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

709

safe_string(gnutls_sec_param_get_name

710

(sec_param)));

711

}

712

}

713

}

714

}

715

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

716

/* Err on the side of caution */

717

sec_param = GNUTLS_SEC_PARAM_ULTRA;

718

if(debug){

719

fprintf_plus(stderr, "Falling back to security parameter"

720

" \"%s\"\n",

721

safe_string(gnutls_sec_param_get_name

722

(sec_param)));

723

}

724

}

725

}

726

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

727

if(uret != 0){

728

mc->dh_bits = uret;

729

if(debug){

730

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

731

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

732

safe_string(gnutls_sec_param_get_name

733

(sec_param)),

734

mc->dh_bits);

735

}

736

} else {

737

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

738

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

739

safe_string(gnutls_sec_param_get_name

740

(sec_param)),

741

safer_gnutls_strerror(ret));

742

goto globalfail;

743

}

744

} else if(debug){

745

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

746

mc->dh_bits);

747

}

748

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

749

if(ret != GNUTLS_E_SUCCESS){

750

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

751

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

752

safer_gnutls_strerror(ret));

753

goto globalfail;

754

}

755

}

756

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

513

ret = gnutls_dh_params_init(&mc.dh_params);

514

if(ret != GNUTLS_E_SUCCESS){

515

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

516

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

517

goto globalfail;

518

}

519

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

520

if(ret != GNUTLS_E_SUCCESS){

521

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

522

safer_gnutls_strerror(ret));

523

goto globalfail;

524

}

525

526

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

757

527

758

528

return 0;

759

529

760

530

globalfail:

761

531

762

gnutls_certificate_free_credentials(mc->cred);

763

gnutls_dh_params_deinit(mc->dh_params);

532

gnutls_certificate_free_credentials(mc.cred);

533

gnutls_global_deinit();

534

gnutls_dh_params_deinit(mc.dh_params);

764

535

return -1;

765

536

}

766

537

767

__attribute__((nonnull, warn_unused_result))

768

static int init_gnutls_session(gnutls_session_t *session,

769

mandos_context *mc){

538

static int init_gnutls_session(gnutls_session_t *session){

770

539

int ret;

771

540

/* GnuTLS session creation */

772

541

do {

776

545

}

777

546

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

778

547

if(ret != GNUTLS_E_SUCCESS){

779

fprintf_plus(stderr,

780

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

781

safer_gnutls_strerror(ret));

548

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

549

safer_gnutls_strerror(ret));

782

550

}

783

551

784

552

{

785

553

const char *err;

786

554

do {

787

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

555

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

788

556

if(quit_now){

789

557

gnutls_deinit(*session);

790

558

return -1;

791

559

}

792

560

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

793

561

if(ret != GNUTLS_E_SUCCESS){

794

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

795

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

796

safer_gnutls_strerror(ret));

562

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

563

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

564

safer_gnutls_strerror(ret));

797

565

gnutls_deinit(*session);

798

566

return -1;

799

567

}

801

569

802

570

do {

803

571

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

804

mc->cred);

572

mc.cred);

805

573

if(quit_now){

806

574

gnutls_deinit(*session);

807

575

return -1;

808

576

}

809

577

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

810

578

if(ret != GNUTLS_E_SUCCESS){

811

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

812

safer_gnutls_strerror(ret));

579

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

580

safer_gnutls_strerror(ret));

813

581

gnutls_deinit(*session);

814

582

return -1;

815

583

}

817

585

/* ignore client certificate if any. */

818

586

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

819

587

588

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

589

820

590

return 0;

821

591

}

822

592

824

594

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

825

595

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

826

596

827

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

828

__attribute__((warn_unused_result))

829

int raise_privileges(void){

830

int old_errno = errno;

831

int ret = 0;

832

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

833

ret = errno;

834

}

835

errno = old_errno;

836

return ret;

837

}

838

839

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

840

__attribute__((warn_unused_result))

841

int raise_privileges_permanently(void){

842

int old_errno = errno;

843

int ret = raise_privileges();

844

if(ret != 0){

845

errno = old_errno;

846

return ret;

847

}

848

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

849

ret = errno;

850

}

851

errno = old_errno;

852

return ret;

853

}

854

855

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

856

__attribute__((warn_unused_result))

857

int lower_privileges(void){

858

int old_errno = errno;

859

int ret = 0;

860

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

861

ret = errno;

862

}

863

errno = old_errno;

864

return ret;

865

}

866

867

/* Lower privileges permanently */

868

__attribute__((warn_unused_result))

869

int lower_privileges_permanently(void){

870

int old_errno = errno;

871

int ret = 0;

872

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

873

ret = errno;

874

}

875

errno = old_errno;

876

return ret;

877

}

878

879

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

880

__attribute__((nonnull, warn_unused_result))

881

static bool add_delete_local_route(const bool add,

882

const char *address,

883

AvahiIfIndex if_index){

884

int ret;

885

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

886

char add_arg[] = "add";

887

char delete_arg[] = "delete";

888

char debug_flag[] = "--debug";

889

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

890

if(pluginhelperdir == NULL){

891

if(debug){

892

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

893

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

894

}

895

return false;

896

}

897

898

char interface[IF_NAMESIZE];

899

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

900

perror_plus("if_indextoname");

901

return false;

902

}

903

904

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

905

if(devnull == -1){

906

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

907

return false;

908

}

909

pid_t pid = fork();

910

if(pid == 0){

911

/* Child */

912

/* Raise privileges */

913

errno = raise_privileges_permanently();

914

if(errno != 0){

915

perror_plus("Failed to raise privileges");

916

/* _exit(EX_NOPERM); */

917

} else {

918

/* Set group */

919

errno = 0;

920

ret = setgid(0);

921

if(ret == -1){

922

perror_plus("setgid");

923

_exit(EX_NOPERM);

924

}

925

/* Reset supplementary groups */

926

errno = 0;

927

ret = setgroups(0, NULL);

928

if(ret == -1){

929

perror_plus("setgroups");

930

_exit(EX_NOPERM);

931

}

932

}

933

ret = dup2(devnull, STDIN_FILENO);

934

if(ret == -1){

935

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

936

_exit(EX_OSERR);

937

}

938

ret = close(devnull);

939

if(ret == -1){

940

perror_plus("close");

941

_exit(EX_OSERR);

942

}

943

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

944

if(ret == -1){

945

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

946

_exit(EX_OSERR);

947

}

948

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

949

O_RDONLY

950

| O_DIRECTORY

951

| O_PATH

952

| O_CLOEXEC));

953

if(helperdir_fd == -1){

954

perror_plus("open");

955

_exit(EX_UNAVAILABLE);

956

}

957

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

958

helper, O_RDONLY));

959

if(helper_fd == -1){

960

perror_plus("openat");

961

close(helperdir_fd);

962

_exit(EX_UNAVAILABLE);

963

}

964

close(helperdir_fd);

965

#ifdef __GNUC__

966

#pragma GCC diagnostic push

967

#pragma GCC diagnostic ignored "-Wcast-qual"

968

#endif

969

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

970

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

971

interface, debug ? debug_flag : NULL, NULL },

972

environ) == -1){

973

#ifdef __GNUC__

974

#pragma GCC diagnostic pop

975

#endif

976

perror_plus("fexecve");

977

_exit(EXIT_FAILURE);

978

}

979

}

980

if(pid == -1){

981

perror_plus("fork");

982

return false;

983

}

984

int status;

985

pid_t pret = -1;

986

errno = 0;

987

do {

988

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

989

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

990

int errno_raising = 0;

991

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

992

errno_raising = errno;

993

perror_plus("Failed to raise privileges in order to"

994

" kill helper program");

995

}

996

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

997

perror_plus("kill");

998

}

999

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

1000

perror_plus("Failed to lower privileges after killing"

1001

" helper program");

1002

}

1003

return false;

1004

}

1005

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

1006

if(pret == -1){

1007

perror_plus("waitpid");

1008

return false;

1009

}

1010

if(WIFEXITED(status)){

1011

if(WEXITSTATUS(status) != 0){

1012

fprintf_plus(stderr, "Error: iprouteadddel exited"

1013

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

1014

return false;

1015

}

1016

return true;

1017

}

1018

if(WIFSIGNALED(status)){

1019

fprintf_plus(stderr, "Error: iprouteadddel died by"

1020

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

1021

return false;

1022

}

1023

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

1024

return false;

1025

}

1026

1027

__attribute__((nonnull, warn_unused_result))

1028

static bool add_local_route(const char *address,

1029

AvahiIfIndex if_index){

1030

if(debug){

1031

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

1032

}

1033

return add_delete_local_route(true, address, if_index);

1034

}

1035

1036

__attribute__((nonnull, warn_unused_result))

1037

static bool delete_local_route(const char *address,

1038

AvahiIfIndex if_index){

1039

if(debug){

1040

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

1041

}

1042

return add_delete_local_route(false, address, if_index);

1043

}

1044

1045

597

/* Called when a Mandos server is found */

1046

__attribute__((nonnull, warn_unused_result))

1047

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

598

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

1048

599

AvahiIfIndex if_index,

1049

int af, mandos_context *mc){

600

int af){

1050

601

int ret, tcp_sd = -1;

1051

602

ssize_t sret;

1052

struct sockaddr_storage to;

603

union {

604

struct sockaddr_in in;

605

struct sockaddr_in6 in6;

606

} to;

1053

607

char *buffer = NULL;

1054

608

char *decrypted_buffer = NULL;

1055

609

size_t buffer_length = 0;

1058

612

int retval = -1;

1059

613

gnutls_session_t session;

1060

614

int pf; /* Protocol family */

1061

bool route_added = false;

1062

615

1063

616

errno = 0;

1064

617

1075

628

pf = PF_INET;

1076

629

break;

1077

630

default:

1078

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

631

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

1079

632

errno = EINVAL;

1080

633

return -1;

1081

634

}

1082

635

1083

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

1084

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

1085

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

1086

bool match = false;

1087

{

1088

char *interface = NULL;

1089

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

1090

mc->interfaces_size,

1091

interface))){

1092

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

1093

match = true;

1094

break;

1095

}

1096

}

1097

}

1098

if(not match){

1099

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

1100

connect to the server */

1101

if(debug){

1102

char interface[IF_NAMESIZE];

1103

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

1104

perror_plus("if_indextoname");

1105

} else {

1106

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

1107

" \"%s\"\n",

1108

if_indextoname((unsigned int)if_index,

1109

interface));

1110

}

1111

}

1112

return -1;

1113

}

1114

}

1115

1116

ret = init_gnutls_session(&session, mc);

636

ret = init_gnutls_session(&session);

1117

637

if(ret != 0){

1118

638

return -1;

1119

639

}

1120

640

1121

641

if(debug){

1122

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

1123

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

642

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

643

"\n", ip, port);

1124

644

}

1125

645

1126

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

646

tcp_sd = socket(pf, SOCK_STREAM, 0);

1127

647

if(tcp_sd < 0){

1128

648

int e = errno;

1129

649

perror_plus("socket");

1136

656

goto mandos_end;

1137

657

}

1138

658

659

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

1139

660

if(af == AF_INET6){

1140

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

1141

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

1142

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

661

to.in6.sin6_family = (sa_family_t)af;

662

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

1143

663

} else { /* IPv4 */

1144

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

1145

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

1146

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

664

to.in.sin_family = (sa_family_t)af;

665

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

1147

666

}

1148

667

if(ret < 0 ){

1149

668

int e = errno;

1153

672

}

1154

673

if(ret == 0){

1155

674

int e = errno;

1156

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

675

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

1157

676

errno = e;

1158

677

goto mandos_end;

1159

678

}

1160

679

if(af == AF_INET6){

1161

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

1162

if(IN6_IS_ADDR_LINKLOCAL

1163

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

680

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

681

-Wconversion and

682

-Wunreachable-code */

683

684

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

685

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

686

-Wunreachable-code*/

1164

687

if(if_index == AVAHI_IF_UNSPEC){

1165

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

1166

" incomplete without a network interface\n");

688

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

689

" without a network interface\n");

1167

690

errno = EINVAL;

1168

691

goto mandos_end;

1169

692

}

1170

693

/* Set the network interface number as scope */

1171

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

694

to.in6.sin6_scope_id = (uint32_t)if_index;

1172

695

}

1173

696

} else {

1174

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

697

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

698

-Wconversion and

699

-Wunreachable-code */

1175

700

}

1176

701

1177

702

if(quit_now){

1185

710

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

1186

711

perror_plus("if_indextoname");

1187

712

} else {

1188

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

1189

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

713

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

714

ip, interface, port);

1190

715

}

1191

716

} else {

1192

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

1193

ip, (uintmax_t)port);

717

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

718

port);

1194

719

}

1195

720

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

1196

721

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

1197

if(af == AF_INET6){

1198

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

1199

sizeof(struct sockaddr_in6),

1200

addrstr, sizeof(addrstr), NULL, 0,

1201

NI_NUMERICHOST);

1202

} else {

1203

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

1204

sizeof(struct sockaddr_in),

1205

addrstr, sizeof(addrstr), NULL, 0,

1206

NI_NUMERICHOST);

1207

}

1208

if(ret == EAI_SYSTEM){

1209

perror_plus("getnameinfo");

1210

} else if(ret != 0) {

1211

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

1212

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

1213

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

1214

}

1215

}

1216

1217

if(quit_now){

1218

errno = EINTR;

1219

goto mandos_end;

1220

}

1221

1222

while(true){

1223

if(af == AF_INET6){

1224

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

1225

sizeof(struct sockaddr_in6));

1226

} else {

1227

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

1228

sizeof(struct sockaddr_in));

1229

}

1230

if(ret < 0){

1231

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

1232

and if_index != AVAHI_IF_UNSPEC

1233

and connect_to == NULL

1234

and not route_added and

1235

((af == AF_INET6 and not

1236

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1237

&to)->sin6_addr)))

1238

or (af == AF_INET and

1239

/* Not a a IPv4LL address */

1240

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

1241

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

1242

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

1243

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

1244

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

1245

connect to a Mandos server announced by Avahi on a server

1246

host with a global address. Work around this by retrying

1247

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

1248

1249

Avahi bug reference:

1250

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

1251

https://bugs.debian.org/587961

1252

*/

1253

if(debug){

1254

fprintf_plus(stderr, "Mandos server unreachable, trying"

1255

" direct route\n");

1256

}

1257

int e = errno;

1258

route_added = add_local_route(ip, if_index);

1259

if(route_added){

1260

continue;

1261

}

1262

errno = e;

1263

}

1264

if(errno != ECONNREFUSED or debug){

1265

int e = errno;

1266

perror_plus("connect");

1267

errno = e;

1268

}

1269

goto mandos_end;

1270

}

1271

1272

if(quit_now){

1273

errno = EINTR;

1274

goto mandos_end;

1275

}

1276

break;

722

const char *pcret;

723

if(af == AF_INET6){

724

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

725

sizeof(addrstr));

726

} else {

727

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

728

sizeof(addrstr));

729

}

730

if(pcret == NULL){

731

perror_plus("inet_ntop");

732

} else {

733

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

734

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

735

}

736

}

737

}

738

739

if(quit_now){

740

errno = EINTR;

741

goto mandos_end;

742

}

743

744

if(af == AF_INET6){

745

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

746

} else {

747

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

748

}

749

if(ret < 0){

750

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

751

int e = errno;

752

perror_plus("connect");

753

errno = e;

754

}

755

goto mandos_end;

756

}

757

758

if(quit_now){

759

errno = EINTR;

760

goto mandos_end;

1277

761

}

1278

762

1279

763

const char *out = mandos_protocol_version;

1281

765

while(true){

1282

766

size_t out_size = strlen(out);

1283

767

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

1284

out_size - written));

768

out_size - written));

1285

769

if(ret == -1){

1286

770

int e = errno;

1287

771

perror_plus("write");

1307

791

}

1308

792

1309

793

if(debug){

1310

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

794

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

1311

795

}

1312

796

1313

797

if(quit_now){

1315

799

goto mandos_end;

1316

800

}

1317

801

1318

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

1319

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

1320

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

1321

gnutls_transport_set_ptr(session,

1322

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

802

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

803

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

1323

804

1324

805

if(quit_now){

1325

806

errno = EINTR;

1336

817

1337

818

if(ret != GNUTLS_E_SUCCESS){

1338

819

if(debug){

1339

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

820

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

1340

821

gnutls_perror(ret);

1341

822

}

1342

823

errno = EPROTO;

1346

827

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

1347

828

1348

829

if(debug){

1349

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

1350

" %s\n", ip);

830

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

831

ip);

1351

832

}

1352

833

1353

834

while(true){

1358

839

}

1359

840

1360

841

buffer_capacity = incbuffer(&buffer, buffer_length,

1361

buffer_capacity);

842

buffer_capacity);

1362

843

if(buffer_capacity == 0){

1363

844

int e = errno;

1364

845

perror_plus("incbuffer");

1391

872

}

1392

873

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

1393

874

if(ret < 0){

1394

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

1395

"***\n");

875

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

1396

876

gnutls_perror(ret);

1397

877

errno = EPROTO;

1398

878

goto mandos_end;

1399

879

}

1400

880

break;

1401

881

default:

1402

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

1403

" encrypted session with Mandos server\n");

882

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

883

" encrypted session with Mandos server\n");

1404

884

gnutls_bye(session, GNUTLS_SHUT_RDWR);

1405

885

errno = EIO;

1406

886

goto mandos_end;

1411

891

}

1412

892

1413

893

if(debug){

1414

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

894

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

1415

895

}

1416

896

1417

897

if(quit_now){

1429

909

1430

910

if(buffer_length > 0){

1431

911

ssize_t decrypted_buffer_size;

1432

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

1433

&decrypted_buffer, mc);

912

decrypted_buffer_size = pgp_packet_decrypt(buffer,

913

buffer_length,

914

&decrypted_buffer);

1434

915

if(decrypted_buffer_size >= 0){

1435

916

1436

clearerr(stdout);

1437

917

written = 0;

1438

918

while(written < (size_t) decrypted_buffer_size){

1439

919

if(quit_now){

1447

927

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

1448

928

int e = errno;

1449

929

if(debug){

1450

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

1451

strerror(errno));

930

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

931

strerror(errno));

1452

932

}

1453

933

errno = e;

1454

934

goto mandos_end;

1455

935

}

1456

936

written += (size_t)ret;

1457

937

}

1458

ret = fflush(stdout);

1459

if(ret != 0){

1460

int e = errno;

1461

if(debug){

1462

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

1463

strerror(errno));

1464

}

1465

errno = e;

1466

goto mandos_end;

1467

}

1468

938

retval = 0;

1469

939

}

1470

940

}

1473

943

1474

944

mandos_end:

1475

945

{

1476

if(route_added){

1477

if(not delete_local_route(ip, if_index)){

1478

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

1479

" interface %d", ip, if_index);

1480

}

1481

}

1482

946

int e = errno;

1483

947

free(decrypted_buffer);

1484

948

free(buffer);

1485

949

if(tcp_sd >= 0){

1486

ret = close(tcp_sd);

950

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

1487

951

}

1488

952

if(ret == -1){

1489

953

if(e == 0){

1514

978

AVAHI_GCC_UNUSED AvahiStringList *txt,

1515

979

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1516

980

flags,

1517

void *mc){

1518

if(r == NULL){

1519

return;

1520

}

981

AVAHI_GCC_UNUSED void* userdata){

982

assert(r);

1521

983

1522

984

/* Called whenever a service has been resolved successfully or

1523

985

timed out */

1524

986

1525

987

if(quit_now){

1526

avahi_s_service_resolver_free(r);

1527

988

return;

1528

989

}

1529

990

1530

991

switch(event){

1531

992

default:

1532

993

case AVAHI_RESOLVER_FAILURE:

1533

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

1534

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

1535

domain,

1536

avahi_strerror(avahi_server_errno

1537

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

994

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

995

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

996

avahi_strerror(avahi_server_errno(mc.server)));

1538

997

break;

1539

998

1540

999

case AVAHI_RESOLVER_FOUND:

1542

1001

char ip[AVAHI_ADDRESS_STR_MAX];

1543

1002

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

1544

1003

if(debug){

1545

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

1546

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

1547

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

1004

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

1005

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

1006

ip, (intmax_t)interface, port);

1548

1007

}

1549

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

1550

interface,

1551

avahi_proto_to_af(proto),

1552

mc);

1008

int ret = start_mandos_communication(ip, port, interface,

1009

avahi_proto_to_af(proto));

1553

1010

if(ret == 0){

1554

avahi_simple_poll_quit(simple_poll);

1011

avahi_simple_poll_quit(mc.simple_poll);

1555

1012

} else {

1556

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

1557

avahi_proto_to_af(proto),

1558

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

1559

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

1560

" list\n", name);

1561

}

1013

ret = add_server(ip, port, interface,

1014

avahi_proto_to_af(proto));

1562

1015

}

1563

1016

}

1564

1017

}

1574

1027

const char *domain,

1575

1028

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1576

1029

flags,

1577

void *mc){

1578

if(b == NULL){

1579

return;

1580

}

1030

AVAHI_GCC_UNUSED void* userdata){

1031

assert(b);

1581

1032

1582

1033

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

1583

1034

is removed from the LAN */

1590

1041

default:

1591

1042

case AVAHI_BROWSER_FAILURE:

1592

1043

1593

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

1594

avahi_strerror(avahi_server_errno

1595

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

1596

avahi_simple_poll_quit(simple_poll);

1044

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

1045

avahi_strerror(avahi_server_errno(mc.server)));

1046

avahi_simple_poll_quit(mc.simple_poll);

1597

1047

return;

1598

1048

1599

1049

case AVAHI_BROWSER_NEW:

1602

1052

the callback function is called the Avahi server will free the

1603

1053

resolver for us. */

1604

1054

1605

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

1606

interface, protocol, name, type,

1607

domain, protocol, 0,

1608

resolve_callback, mc) == NULL)

1609

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

1610

" %s\n", name,

1611

avahi_strerror(avahi_server_errno

1612

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

1055

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

1056

name, type, domain, protocol, 0,

1057

resolve_callback, NULL) == NULL)

1058

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

1059

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

1613

1060

break;

1614

1061

1615

1062

case AVAHI_BROWSER_REMOVE:

1618

1065

case AVAHI_BROWSER_ALL_FOR_NOW:

1619

1066

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1620

1067

if(debug){

1621

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

1622

" searching...\n");

1068

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

1623

1069

}

1624

1070

break;

1625

1071

}

1634

1080

signal_received = sig;

1635

1081

int old_errno = errno;

1636

1082

/* set main loop to exit */

1637

if(simple_poll != NULL){

1638

avahi_simple_poll_quit(simple_poll);

1083

if(mc.simple_poll != NULL){

1084

avahi_simple_poll_quit(mc.simple_poll);

1639

1085

}

1640

1086

errno = old_errno;

1641

1087

}

1642

1088

1643

__attribute__((nonnull, warn_unused_result))

1644

1089

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

1645

1090

int ret;

1646

int old_errno;

1647

1091

1648

1092

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

1649

1093

if(s < 0){

1650

old_errno = errno;

1651

1094

perror_plus("socket");

1652

errno = old_errno;

1653

1095

return false;

1654

1096

}

1655

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

1656

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

1097

strcpy(ifr->ifr_name, ifname);

1657

1098

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1658

1099

if(ret == -1){

1659

1100

if(debug){

1660

old_errno = errno;

1661

1101

perror_plus("ioctl SIOCGIFFLAGS");

1662

errno = old_errno;

1663

}

1664

if((close(s) == -1) and debug){

1665

old_errno = errno;

1666

perror_plus("close");

1667

errno = old_errno;

1668

1102

}

1669

1103

return false;

1670

1104

}

1671

if((close(s) == -1) and debug){

1672

old_errno = errno;

1673

perror_plus("close");

1674

errno = old_errno;

1675

}

1676

1105

return true;

1677

1106

}

1678

1107

1679

__attribute__((nonnull, warn_unused_result))

1680

1108

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

1681

1109

1682

1110

/* Reject the loopback device */

1683

1111

if(ifr->ifr_flags & IFF_LOOPBACK){

1684

1112

if(debug){

1685

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

1686

ifname);

1113

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

1114

ifname);

1687

1115

}

1688

1116

return false;

1689

1117

}

1690

1118

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

1691

1119

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

1692

1120

if(debug){

1693

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

1694

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

1121

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

1122

ifname);

1695

1123

}

1696

1124

return true;

1697

1125

}

1698

1126

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

1699

1127

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

1700

1128

if(debug){

1701

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1702

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

1129

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

1130

ifname);

1703

1131

}

1704

1132

return false;

1705

1133

}

1706

1134

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

1707

1135

if(ifr->ifr_flags & IFF_NOARP){

1708

1136

if(debug){

1709

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

1710

ifname);

1137

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

1711

1138

}

1712

1139

return false;

1713

1140

}

1714

1141

1715

1142

/* Accept this device */

1716

1143

if(debug){

1717

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

1144

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

1718

1145

}

1719

1146

return true;

1720

1147

}

1724

1151

* corresponds to an acceptable network device.

1725

1152

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

1726

1153

*/

1727

__attribute__((nonnull, warn_unused_result))

1728

1154

int good_interface(const struct dirent *if_entry){

1729

1155

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

1730

1156

return 0;

1733

1159

struct ifreq ifr;

1734

1160

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

1735

1161

if(debug){

1736

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

1737

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

1738

}

1739

return 0;

1740

}

1741

1742

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

1743

return 0;

1744

}

1745

return 1;

1746

}

1747

1748

/*

1749

* This function determines if a network interface is up.

1750

*/

1751

__attribute__((nonnull, warn_unused_result))

1752

bool interface_is_up(const char *interface){

1753

struct ifreq ifr;

1754

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

1755

if(debug){

1756

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

1757

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

1758

}

1759

return false;

1760

}

1761

1762

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

1763

}

1764

1765

/*

1766

* This function determines if a network interface is running

1767

*/

1768

__attribute__((nonnull, warn_unused_result))

1769

bool interface_is_running(const char *interface){

1770

struct ifreq ifr;

1771

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

1772

if(debug){

1773

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

1774

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

1775

}

1776

return false;

1777

}

1778

1779

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

1780

}

1781

1782

__attribute__((nonnull, pure, warn_unused_result))

1162

fprintf(stderr, "Failed to get flags for interface \"%s\"\n",

1163

if_entry->d_name);

1164

}

1165

return 0;

1166

}

1167

1168

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

1169

return 0;

1170

}

1171

return 1;

1172

}

1173

1174

/*

1175

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

1176

* corresponds to an acceptable network device which is up.

1177

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

1178

*/

1179

int up_interface(const struct dirent *if_entry){

1180

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

1181

return 0;

1182

}

1183

1184

struct ifreq ifr;

1185

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

1186

if(debug){

1187

fprintf(stderr, "Failed to get flags for interface \"%s\"\n",

1188

if_entry->d_name);

1189

}

1190

return 0;

1191

}

1192

1193

/* Reject down interfaces */

1194

if(not (ifr.ifr_flags & IFF_UP)){

1195

if(debug){

1196

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

1197

if_entry->d_name);

1198

}

1199

return 0;

1200

}

1201

1202

/* Reject non-running interfaces */

1203

if(not (ifr.ifr_flags & IFF_RUNNING)){

1204

if(debug){

1205

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

1206

if_entry->d_name);

1207

}

1208

return 0;

1209

}

1210

1211

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

1212

return 0;

1213

}

1214

return 1;

1215

}

1216

1783

1217

int notdotentries(const struct dirent *direntry){

1784

1218

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

1785

1219

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

1792

1226

}

1793

1227

1794

1228

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

1795

__attribute__((nonnull, warn_unused_result))

1796

1229

int runnable_hook(const struct dirent *direntry){

1797

1230

int ret;

1798

size_t sret;

1799

1231

struct stat st;

1800

1232

1801

1233

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

1803

1235

return 0;

1804

1236

}

1805

1237

1806

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

1807

"abcdefghijklmnopqrstuvwxyz"

1808

"0123456789"

1809

"_.-");

1810

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

1811

/* Contains non-allowed characters */

1812

if(debug){

1813

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

1814

direntry->d_name);

1815

}

1816

return 0;

1817

}

1818

1819

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

1238

/* Save pointer to last character */

1239

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

1240

1241

if(*end == '~'){

1242

/* Backup name~ */

1243

return 0;

1244

}

1245

1246

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

1247

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

1248

/* Temporary #name# */

1249

return 0;

1250

}

1251

1252

/* XXX more rules here */

1253

1254

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

1820

1255

if(ret == -1){

1821

1256

if(debug){

1822

perror_plus("Could not stat hook");

1257

perror_plus("Could not stat plugin");

1823

1258

}

1824

1259

return 0;

1825

1260

}

1826

1261

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

1827

1262

/* Not a regular file */

1828

if(debug){

1829

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

1830

direntry->d_name);

1831

}

1832

1263

return 0;

1833

1264

}

1834

1265

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

1835

1266

/* Not executable */

1836

if(debug){

1837

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

1838

direntry->d_name);

1839

}

1840

1267

return 0;

1841

1268

}

1842

if(debug){

1843

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

1844

direntry->d_name);

1845

}

1846

1269

return 1;

1847

1270

}

1848

1271

1849

__attribute__((nonnull, warn_unused_result))

1850

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1851

mandos_context *mc){

1272

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1852

1273

int ret;

1853

1274

struct timespec now;

1854

1275

struct timespec waited_time;

1855

1276

intmax_t block_time;

1856

1277

1857

1278

while(true){

1858

if(mc->current_server == NULL){

1859

if(debug){

1860

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

1861

" No timeout!\n");

1279

if(mc.current_server == NULL){

1280

if (debug){

1281

fprintf(stderr,

1282

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

1862

1283

}

1863

1284

ret = avahi_simple_poll_iterate(s, -1);

1864

1285

} else {

1865

if(debug){

1866

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

1867

" it, or wait\n");

1286

if (debug){

1287

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

1288

" or wait\n");

1868

1289

}

1869

1290

/* the current time */

1870

1291

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1875

1296

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

1876

1297

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

1877

1298

waited_time.tv_sec = (now.tv_sec

1878

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

1299

- mc.current_server->last_seen.tv_sec);

1879

1300

waited_time.tv_nsec = (now.tv_nsec

1880

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

1301

- mc.current_server->last_seen.tv_nsec);

1881

1302

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

1882

1303

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

1883

1304

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

1885

1306

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

1886

1307

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

1887

1308

1888

if(debug){

1889

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

1890

block_time);

1309

if (debug){

1310

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

1891

1311

}

1892

1312

1893

1313

if(block_time <= 0){

1894

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

1895

mc->current_server->port,

1896

mc->current_server->if_index,

1897

mc->current_server->af, mc);

1314

ret = start_mandos_communication(mc.current_server->ip,

1315

mc.current_server->port,

1316

mc.current_server->if_index,

1317

mc.current_server->af);

1898

1318

if(ret == 0){

1899

avahi_simple_poll_quit(s);

1319

avahi_simple_poll_quit(mc.simple_poll);

1900

1320

return 0;

1901

1321

}

1902

1322

ret = clock_gettime(CLOCK_MONOTONIC,

1903

&mc->current_server->last_seen);

1323

&mc.current_server->last_seen);

1904

1324

if(ret == -1){

1905

1325

perror_plus("clock_gettime");

1906

1326

return -1;

1907

1327

}

1908

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

1328

mc.current_server = mc.current_server->next;

1909

1329

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

1910

1330

servers, but don't block */

1911

1331

}

1913

1333

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

1914

1334

}

1915

1335

if(ret != 0){

1916

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

1336

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

1917

1337

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

1918

1338

}

1919

1339

}

1920

1340

}

1921

1341

}

1922

1342

1923

__attribute__((nonnull))

1924

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

1925

const float delay){

1926

struct dirent **direntries = NULL;

1927

if(hookdir_fd == -1){

1928

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1929

| O_CLOEXEC);

1930

if(hookdir_fd == -1){

1931

if(errno == ENOENT){

1932

if(debug){

1933

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

1934

" found\n", hookdir);

1935

}

1936

} else {

1937

perror_plus("open");

1938

}

1939

return;

1940

}

1941

}

1942

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

1943

if(devnull == -1){

1944

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

1945

return;

1946

}

1947

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

1948

runnable_hook, alphasort);

1949

if(numhooks == -1){

1950

perror_plus("scandir");

1951

close(devnull);

1952

return;

1953

}

1954

struct dirent *direntry;

1955

int ret;

1956

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

1957

direntry = direntries[i];

1958

if(debug){

1959

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

1960

direntry->d_name);

1961

}

1962

pid_t hook_pid = fork();

1963

if(hook_pid == 0){

1964

/* Child */

1965

/* Raise privileges */

1966

errno = raise_privileges_permanently();

1967

if(errno != 0){

1968

perror_plus("Failed to raise privileges");

1969

_exit(EX_NOPERM);

1970

}

1971

/* Set group */

1972

errno = 0;

1973

ret = setgid(0);

1974

if(ret == -1){

1975

perror_plus("setgid");

1976

_exit(EX_NOPERM);

1977

}

1978

/* Reset supplementary groups */

1979

errno = 0;

1980

ret = setgroups(0, NULL);

1981

if(ret == -1){

1982

perror_plus("setgroups");

1983

_exit(EX_NOPERM);

1984

}

1985

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

1986

if(ret == -1){

1987

perror_plus("setenv");

1988

_exit(EX_OSERR);

1989

}

1990

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

1991

if(ret == -1){

1992

perror_plus("setenv");

1993

_exit(EX_OSERR);

1994

}

1995

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

1996

if(ret == -1){

1997

perror_plus("setenv");

1998

_exit(EX_OSERR);

1999

}

2000

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

2001

if(ret == -1){

2002

perror_plus("setenv");

2003

_exit(EX_OSERR);

2004

}

2005

char *delaystring;

2006

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

2007

if(ret == -1){

2008

perror_plus("asprintf");

2009

_exit(EX_OSERR);

2010

}

2011

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

2012

if(ret == -1){

2013

free(delaystring);

2014

perror_plus("setenv");

2015

_exit(EX_OSERR);

2016

}

2017

free(delaystring);

2018

if(connect_to != NULL){

2019

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

2020

if(ret == -1){

2021

perror_plus("setenv");

2022

_exit(EX_OSERR);

2023

}

2024

}

2025

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

2026

direntry->d_name,

2027

O_RDONLY));

2028

if(hook_fd == -1){

2029

perror_plus("openat");

2030

_exit(EXIT_FAILURE);

2031

}

2032

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

2033

perror_plus("close");

2034

_exit(EXIT_FAILURE);

2035

}

2036

ret = dup2(devnull, STDIN_FILENO);

2037

if(ret == -1){

2038

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

2039

_exit(EX_OSERR);

2040

}

2041

ret = close(devnull);

2042

if(ret == -1){

2043

perror_plus("close");

2044

_exit(EX_OSERR);

2045

}

2046

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2047

if(ret == -1){

2048

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

2049

_exit(EX_OSERR);

2050

}

2051

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

2052

environ) == -1){

2053

perror_plus("fexecve");

2054

_exit(EXIT_FAILURE);

2055

}

2056

} else {

2057

if(hook_pid == -1){

2058

perror_plus("fork");

2059

free(direntry);

2060

continue;

2061

}

2062

int status;

2063

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

2064

perror_plus("waitpid");

2065

free(direntry);

2066

continue;

2067

}

2068

if(WIFEXITED(status)){

2069

if(WEXITSTATUS(status) != 0){

2070

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

2071

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

2072

WEXITSTATUS(status));

2073

free(direntry);

2074

continue;

2075

}

2076

} else if(WIFSIGNALED(status)){

2077

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

2078

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

2079

WTERMSIG(status));

2080

free(direntry);

2081

continue;

2082

} else {

2083

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

2084

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

2085

free(direntry);

2086

continue;

2087

}

2088

}

2089

if(debug){

2090

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

2091

direntry->d_name);

2092

}

2093

free(direntry);

2094

}

2095

free(direntries);

2096

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

2097

perror_plus("close");

2098

} else {

2099

hookdir_fd = -1;

2100

}

2101

close(devnull);

2102

}

2103

2104

__attribute__((nonnull, warn_unused_result))

2105

int bring_up_interface(const char *const interface,

2106

const float delay){

2107

int old_errno = errno;

2108

int ret;

2109

struct ifreq network;

2110

unsigned int if_index = if_nametoindex(interface);

2111

if(if_index == 0){

2112

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

2113

errno = old_errno;

2114

return ENXIO;

2115

}

2116

2117

if(quit_now){

2118

errno = old_errno;

2119

return EINTR;

2120

}

2121

2122

if(not interface_is_up(interface)){

2123

int ret_errno = 0;

2124

int ioctl_errno = 0;

2125

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

2126

ret_errno = errno;

2127

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

2128

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

2129

errno = old_errno;

2130

return ret_errno;

2131

}

2132

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

2133

2134

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

2135

if(sd == -1){

2136

ret_errno = errno;

2137

perror_plus("socket");

2138

errno = old_errno;

2139

return ret_errno;

2140

}

2141

2142

if(quit_now){

2143

ret = close(sd);

2144

if(ret == -1){

2145

perror_plus("close");

2146

}

2147

errno = old_errno;

2148

return EINTR;

2149

}

2150

2151

if(debug){

2152

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

2153

interface);

2154

}

2155

2156

/* Raise privileges */

2157

ret_errno = raise_privileges();

2158

if(ret_errno != 0){

2159

errno = ret_errno;

2160

perror_plus("Failed to raise privileges");

2161

}

2162

2163

#ifdef __linux__

2164

int ret_linux;

2165

bool restore_loglevel = false;

2166

if(ret_errno == 0){

2167

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2168

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

2169

ret_linux = klogctl(8, NULL, 5);

2170

if(ret_linux == -1){

2171

perror_plus("klogctl");

2172

} else {

2173

restore_loglevel = true;

2174

}

2175

}

2176

#endif /* __linux__ */

2177

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

2178

ioctl_errno = errno;

2179

#ifdef __linux__

2180

if(restore_loglevel){

2181

ret_linux = klogctl(7, NULL, 0);

2182

if(ret_linux == -1){

2183

perror_plus("klogctl");

2184

}

2185

}

2186

#endif /* __linux__ */

2187

2188

/* If raise_privileges() succeeded above */

2189

if(ret_errno == 0){

2190

/* Lower privileges */

2191

ret_errno = lower_privileges();

2192

if(ret_errno != 0){

2193

errno = ret_errno;

2194

perror_plus("Failed to lower privileges");

2195

}

2196

}

2197

2198

/* Close the socket */

2199

ret = close(sd);

2200

if(ret == -1){

2201

perror_plus("close");

2202

}

2203

2204

if(ret_setflags == -1){

2205

errno = ioctl_errno;

2206

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2207

errno = old_errno;

2208

return ioctl_errno;

2209

}

2210

} else if(debug){

2211

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

2212

interface);

2213

}

2214

2215

/* Sleep checking until interface is running.

2216

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

2217

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

2218

if(interface_is_running(interface)){

2219

break;

2220

}

2221

struct timespec sleeptime = { .tv_nsec = 250000000 };

2222

ret = nanosleep(&sleeptime, NULL);

2223

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

2224

perror_plus("nanosleep");

2225

}

2226

}

2227

2228

errno = old_errno;

2229

return 0;

2230

}

2231

2232

__attribute__((nonnull, warn_unused_result))

2233

int take_down_interface(const char *const interface){

2234

int old_errno = errno;

2235

struct ifreq network;

2236

unsigned int if_index = if_nametoindex(interface);

2237

if(if_index == 0){

2238

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

2239

errno = old_errno;

2240

return ENXIO;

2241

}

2242

if(interface_is_up(interface)){

2243

int ret_errno = 0;

2244

int ioctl_errno = 0;

2245

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

2246

ret_errno = errno;

2247

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

2248

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

2249

errno = old_errno;

2250

return ret_errno;

2251

}

2252

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

2253

2254

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

2255

if(sd == -1){

2256

ret_errno = errno;

2257

perror_plus("socket");

2258

errno = old_errno;

2259

return ret_errno;

2260

}

2261

2262

if(debug){

2263

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

2264

interface);

2265

}

2266

2267

/* Raise privileges */

2268

ret_errno = raise_privileges();

2269

if(ret_errno != 0){

2270

errno = ret_errno;

2271

perror_plus("Failed to raise privileges");

2272

}

2273

2274

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

2275

ioctl_errno = errno;

2276

2277

/* If raise_privileges() succeeded above */

2278

if(ret_errno == 0){

2279

/* Lower privileges */

2280

ret_errno = lower_privileges();

2281

if(ret_errno != 0){

2282

errno = ret_errno;

2283

perror_plus("Failed to lower privileges");

2284

}

2285

}

2286

2287

/* Close the socket */

2288

int ret = close(sd);

2289

if(ret == -1){

2290

perror_plus("close");

2291

}

2292

2293

if(ret_setflags == -1){

2294

errno = ioctl_errno;

2295

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2296

errno = old_errno;

2297

return ioctl_errno;

2298

}

2299

} else if(debug){

2300

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

2301

interface);

2302

}

2303

2304

errno = old_errno;

2305

return 0;

2306

}

2307

2308

1343

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

2309

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

2310

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

2311

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

2312

.current_server = NULL, .interfaces = NULL,

2313

.interfaces_size = 0 };

2314

1344

AvahiSServiceBrowser *sb = NULL;

2315

error_t ret_errno;

1345

int error;

2316

1346

int ret;

2317

1347

intmax_t tmpmax;

2318

1348

char *tmp;

2319

1349

int exitcode = EXIT_SUCCESS;

2320

char *interfaces_to_take_down = NULL;

2321

size_t interfaces_to_take_down_size = 0;

2322

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

2323

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

2324

char *tempdir = NULL;

1350

const char *interface = "";

1351

struct ifreq network;

1352

int sd = -1;

1353

bool take_down_interface = false;

1354

uid_t uid;

1355

gid_t gid;

1356

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

1357

bool tempdir_created = false;

2325

1358

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2326

1359

const char *seckey = PATHDIR "/" SECKEY;

2327

1360

const char *pubkey = PATHDIR "/" PUBKEY;

2328

const char *dh_params_file = NULL;

2329

char *interfaces_hooks = NULL;

2330

1361

2331

1362

bool gnutls_initialized = false;

2332

1363

bool gpgme_initialized = false;

2384

1415

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

2385

1416

" Diffie-Hellman key exchange",

2386

1417

.group = 2 },

2387

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

2388

.arg = "FILE",

2389

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

2390

" for the Diffie-Hellman key exchange",

2391

.group = 2 },

2392

1418

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

2393

1419

.arg = "STRING",

2394

1420

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

2399

1425

.group = 2 },

2400

1426

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

2401

1427

.arg = "SECONDS",

2402

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

2403

.group = 2 },

2404

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

2405

.arg = "DIR",

2406

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

1428

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

2407

1429

.group = 2 },

2408

1430

/*

2409

1431

* These reproduce what we would get without ARGP_NO_HELP

2428

1450

connect_to = arg;

2429

1451

break;

2430

1452

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

2431

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

2432

arg, (int)',');

2433

if(ret_errno != 0){

2434

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

2435

}

1453

interface = arg;

2436

1454

break;

2437

1455

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

2438

1456

seckey = arg;

2449

1467

}

2450

1468

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

2451

1469

break;

2452

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

2453

dh_params_file = arg;

2454

break;

2455

1470

case 130: /* --priority */

2456

1471

mc.priority = arg;

2457

1472

break;

2470

1485

argp_error(state, "Bad retry interval");

2471

1486

}

2472

1487

break;

2473

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

2474

hookdir = arg;

2475

break;

2476

1488

/*

2477

1489

* These reproduce what we would get without ARGP_NO_HELP

2478

1490

*/

2484

1496

argp_state_help(state, state->out_stream,

2485

1497

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

2486

1498

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

2487

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

1499

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

2488

1500

exit(argp_err_exit_status);

2489

1501

break;

2490

1502

default:

2497

1509

.args_doc = "",

2498

1510

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

2499

1511

" passwords from a Mandos server" };

2500

ret_errno = argp_parse(&argp, argc, argv,

2501

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2502

switch(ret_errno){

1512

ret = argp_parse(&argp, argc, argv,

1513

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1514

switch(ret){

2503

1515

case 0:

2504

1516

break;

2505

1517

case ENOMEM:

2506

1518

default:

2507

errno = ret_errno;

1519

errno = ret;

2508

1520

perror_plus("argp_parse");

2509

1521

exitcode = EX_OSERR;

2510

1522

goto end;

2513

1525

goto end;

2514

1526

}

2515

1527

}

2516

1528

2517

1529

{

2518

1530

/* Work around Debian bug #633582:

2519

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

2520

2521

/* Re-raise privileges */

2522

ret = raise_privileges();

2523

if(ret != 0){

2524

errno = ret;

2525

perror_plus("Failed to raise privileges");

2526

} else {

2527

struct stat st;

2528

2529

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

2530

int seckey_fd = open(seckey, O_RDONLY);

2531

if(seckey_fd == -1){

2532

perror_plus("open");

2533

} else {

2534

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

2535

if(ret == -1){

2536

perror_plus("fstat");

2537

} else {

2538

if(S_ISREG(st.st_mode)

2539

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

2540

ret = fchown(seckey_fd, uid, gid);

2541

if(ret == -1){

2542

perror_plus("fchown");

2543

}

2544

}

2545

}

2546

close(seckey_fd);

2547

}

2548

}

2549

2550

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

2551

int pubkey_fd = open(pubkey, O_RDONLY);

2552

if(pubkey_fd == -1){

2553

perror_plus("open");

2554

} else {

2555

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

2556

if(ret == -1){

2557

perror_plus("fstat");

2558

} else {

2559

if(S_ISREG(st.st_mode)

2560

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

2561

ret = fchown(pubkey_fd, uid, gid);

2562

if(ret == -1){

2563

perror_plus("fchown");

2564

}

2565

}

2566

}

2567

close(pubkey_fd);

2568

}

2569

}

2570

2571

if(dh_params_file != NULL

2572

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

2573

int dhparams_fd = open(dh_params_file, O_RDONLY);

2574

if(dhparams_fd == -1){

2575

perror_plus("open");

2576

} else {

2577

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

2578

if(ret == -1){

2579

perror_plus("fstat");

2580

} else {

2581

if(S_ISREG(st.st_mode)

2582

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

2583

ret = fchown(dhparams_fd, uid, gid);

2584

if(ret == -1){

2585

perror_plus("fchown");

2586

}

2587

}

2588

}

2589

close(dhparams_fd);

2590

}

2591

}

2592

2593

/* Lower privileges */

2594

ret = lower_privileges();

2595

if(ret != 0){

2596

errno = ret;

2597

perror_plus("Failed to lower privileges");

2598

}

2599

}

2600

}

2601

2602

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

2603

{

2604

char *interface = NULL;

2605

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

2606

interface))){

2607

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

2608

and if_nametoindex(interface) == 0){

2609

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

2610

fprintf_plus(stderr, "Not using nonexisting interface"

2611

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

2612

}

2613

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

2614

interface = NULL;

2615

}

2616

}

2617

}

2618

2619

/* Run network hooks */

2620

{

2621

if(mc.interfaces != NULL){

2622

interfaces_hooks = malloc(mc.interfaces_size);

2623

if(interfaces_hooks == NULL){

2624

perror_plus("malloc");

1531

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

1532

struct stat st;

1533

1534

/* Re-raise priviliges */

1535

errno = 0;

1536

ret = seteuid(0);

1537

if(ret == -1){

1538

perror_plus("seteuid");

1539

}

1540

1541

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

1542

int seckey_fd = open(seckey, O_RDONLY);

1543

if(seckey_fd == -1){

1544

perror_plus("open");

1545

} else {

1546

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

1547

if(ret == -1){

1548

perror_plus("fstat");

1549

} else {

1550

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

1551

ret = fchown(seckey_fd, uid, gid);

1552

if(ret == -1){

1553

perror_plus("fchown");

1554

}

1555

}

1556

}

1557

TEMP_FAILURE_RETRY(close(seckey_fd));

1558

}

1559

}

1560

1561

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

1562

int pubkey_fd = open(pubkey, O_RDONLY);

1563

if(pubkey_fd == -1){

1564

perror_plus("open");

1565

} else {

1566

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

1567

if(ret == -1){

1568

perror_plus("fstat");

1569

} else {

1570

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

1571

ret = fchown(pubkey_fd, uid, gid);

1572

if(ret == -1){

1573

perror_plus("fchown");

1574

}

1575

}

1576

}

1577

TEMP_FAILURE_RETRY(close(pubkey_fd));

1578

}

1579

}

1580

1581

/* Lower privileges */

1582

errno = 0;

1583

ret = seteuid(uid);

1584

if(ret == -1){

1585

perror_plus("seteuid");

1586

}

1587

}

1588

1589

/* Find network hooks and run them */

1590

{

1591

struct dirent **direntries;

1592

struct dirent *direntry;

1593

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

1594

alphasort);

1595

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

1596

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

1597

direntry = direntries[0];

1598

char *fullname = NULL;

1599

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

1600

direntry->d_name);

1601

if(ret < 0){

1602

perror_plus("asprintf");

1603

continue;

1604

}

1605

pid_t hook_pid = fork();

1606

if(hook_pid == 0){

1607

/* Child */

1608

dup2(devnull, STDIN_FILENO);

1609

close(devnull);

1610

dup2(STDERR_FILENO, STDOUT_FILENO);

1611

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

1612

if(ret == -1){

1613

perror_plus("setenv");

1614

exit(1);

1615

}

1616

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

1617

if(ret == -1){

1618

perror_plus("setenv");

1619

exit(1);

1620

}

1621

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

1622

if(ret == -1){

1623

perror_plus("setenv");

1624

exit(1);

1625

}

1626

char *delaystring;

1627

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

1628

if(ret == -1){

1629

perror_plus("asprintf");

1630

exit(1);

1631

}

1632

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

1633

if(ret == -1){

1634

free(delaystring);

1635

perror_plus("setenv");

1636

exit(1);

1637

}

1638

free(delaystring);

1639

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

1640

perror_plus("execl");

1641

}

1642

free(fullname);

1643

if(quit_now){

2625

1644

goto end;

2626

1645

}

2627

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

2628

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

2629

1646

}

2630

run_network_hooks("start", interfaces_hooks != NULL ?

2631

interfaces_hooks : "", delay);

1647

close(devnull);

2632

1648

}

2633

1649

2634

1650

if(not debug){

2635

1651

avahi_set_log_function(empty_log);

2636

1652

}

2637

1653

1654

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

1655

struct dirent **direntries;

1656

/* First look for interfaces that are up */

1657

ret = scandir(sys_class_net, &direntries, up_interface,

1658

alphasort);

1659

if(ret == 0){

1660

/* No up interfaces, look for any good interfaces */

1661

free(direntries);

1662

ret = scandir(sys_class_net, &direntries, good_interface,

1663

alphasort);

1664

}

1665

if(ret >= 1){

1666

/* Pick the first interface returned */

1667

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

1668

if(debug){

1669

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

1670

}

1671

if(interface == NULL){

1672

perror_plus("malloc");

1673

free(direntries);

1674

exitcode = EXIT_FAILURE;

1675

goto end;

1676

}

1677

free(direntries);

1678

} else {

1679

free(direntries);

1680

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

1681

exitcode = EXIT_FAILURE;

1682

goto end;

1683

}

1684

}

1685

2638

1686

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

2639

1687

from the signal handler */

2640

1688

/* Initialize the pseudo-RNG for Avahi */

2641

1689

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

2642

simple_poll = avahi_simple_poll_new();

2643

if(simple_poll == NULL){

2644

fprintf_plus(stderr,

2645

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

1690

mc.simple_poll = avahi_simple_poll_new();

1691

if(mc.simple_poll == NULL){

1692

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

2646

1693

exitcode = EX_UNAVAILABLE;

2647

1694

goto end;

2648

1695

}

2710

1757

}

2711

1758

}

2712

1759

2713

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

2714

if(mc.interfaces == NULL){

2715

struct dirent **direntries = NULL;

2716

/* Look for any good interfaces */

2717

ret = scandir(sys_class_net, &direntries, good_interface,

2718

alphasort);

2719

if(ret >= 1){

2720

/* Add all found interfaces to interfaces list */

2721

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

2722

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

2723

direntries[i]->d_name);

2724

if(ret_errno != 0){

2725

errno = ret_errno;

2726

perror_plus("argz_add");

2727

free(direntries[i]);

2728

continue;

2729

}

2730

if(debug){

2731

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

2732

direntries[i]->d_name);

2733

}

2734

free(direntries[i]);

2735

}

2736

free(direntries);

1760

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

1761

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

1762

if_index = (AvahiIfIndex) if_nametoindex(interface);

1763

if(if_index == 0){

1764

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

1765

exitcode = EX_UNAVAILABLE;

1766

goto end;

1767

}

1768

1769

if(quit_now){

1770

goto end;

1771

}

1772

1773

/* Re-raise priviliges */

1774

errno = 0;

1775

ret = seteuid(0);

1776

if(ret == -1){

1777

perror_plus("seteuid");

1778

}

1779

1780

#ifdef __linux__

1781

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1782

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

1783

ret = klogctl(8, NULL, 5);

1784

bool restore_loglevel = true;

1785

if(ret == -1){

1786

restore_loglevel = false;

1787

perror_plus("klogctl");

1788

}

1789

#endif /* __linux__ */

1790

1791

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1792

if(sd < 0){

1793

perror_plus("socket");

1794

exitcode = EX_OSERR;

1795

#ifdef __linux__

1796

if(restore_loglevel){

1797

ret = klogctl(7, NULL, 0);

1798

if(ret == -1){

1799

perror_plus("klogctl");

1800

}

1801

}

1802

#endif /* __linux__ */

1803

/* Lower privileges */

1804

errno = 0;

1805

ret = seteuid(uid);

1806

if(ret == -1){

1807

perror_plus("seteuid");

1808

}

1809

goto end;

1810

}

1811

strcpy(network.ifr_name, interface);

1812

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

1813

if(ret == -1){

1814

perror_plus("ioctl SIOCGIFFLAGS");

1815

#ifdef __linux__

1816

if(restore_loglevel){

1817

ret = klogctl(7, NULL, 0);

1818

if(ret == -1){

1819

perror_plus("klogctl");

1820

}

1821

}

1822

#endif /* __linux__ */

1823

exitcode = EX_OSERR;

1824

/* Lower privileges */

1825

errno = 0;

1826

ret = seteuid(uid);

1827

if(ret == -1){

1828

perror_plus("seteuid");

1829

}

1830

goto end;

1831

}

1832

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

1833

network.ifr_flags |= IFF_UP;

1834

take_down_interface = true;

1835

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

1836

if(ret == -1){

1837

take_down_interface = false;

1838

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1839

exitcode = EX_OSERR;

1840

#ifdef __linux__

1841

if(restore_loglevel){

1842

ret = klogctl(7, NULL, 0);

1843

if(ret == -1){

1844

perror_plus("klogctl");

1845

}

1846

}

1847

#endif /* __linux__ */

1848

/* Lower privileges */

1849

errno = 0;

1850

ret = seteuid(uid);

1851

if(ret == -1){

1852

perror_plus("seteuid");

1853

}

1854

goto end;

1855

}

1856

}

1857

/* Sleep checking until interface is running.

1858

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

1859

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

1860

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

1861

if(ret == -1){

1862

perror_plus("ioctl SIOCGIFFLAGS");

1863

} else if(network.ifr_flags & IFF_RUNNING){

1864

break;

1865

}

1866

struct timespec sleeptime = { .tv_nsec = 250000000 };

1867

ret = nanosleep(&sleeptime, NULL);

1868

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

1869

perror_plus("nanosleep");

1870

}

1871

}

1872

if(not take_down_interface){

1873

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

1874

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

1875

if(ret == -1){

1876

perror_plus("close");

1877

}

1878

}

1879

#ifdef __linux__

1880

if(restore_loglevel){

1881

/* Restores kernel loglevel to default */

1882

ret = klogctl(7, NULL, 0);

1883

if(ret == -1){

1884

perror_plus("klogctl");

1885

}

1886

}

1887

#endif /* __linux__ */

1888

/* Lower privileges */

1889

errno = 0;

1890

if(take_down_interface){

1891

/* Lower privileges */

1892

ret = seteuid(uid);

1893

if(ret == -1){

1894

perror_plus("seteuid");

1895

}

2737

1896

} else {

2738

if(ret == 0){

2739

free(direntries);

2740

}

2741

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

2742

exitcode = EXIT_FAILURE;

2743

goto end;

2744

}

2745

}

2746

2747

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

2748

{

2749

char *interface = NULL;

2750

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

2751

interface))){

2752

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

2753

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

2754

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

2755

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

2756

interface);

2757

interface = NULL;

2758

while((interface = argz_next(mc.interfaces,

2759

mc.interfaces_size, interface))){

2760

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

2761

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

2762

interface);

2763

interface = NULL;

2764

}

2765

}

2766

break;

2767

}

2768

bool interface_was_up = interface_is_up(interface);

2769

errno = bring_up_interface(interface, delay);

2770

if(not interface_was_up){

2771

if(errno != 0){

2772

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

2773

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

2774

} else {

2775

errno = argz_add(&interfaces_to_take_down,

2776

&interfaces_to_take_down_size,

2777

interface);

2778

if(errno != 0){

2779

perror_plus("argz_add");

2780

}

2781

}

2782

}

2783

}

2784

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

2785

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

2786

}

2787

}

2788

2789

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

2790

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

2791

if(debug){

2792

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

2793

mc.interfaces);

2794

}

2795

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

1897

/* Lower privileges permanently */

1898

ret = setuid(uid);

1899

if(ret == -1){

1900

perror_plus("setuid");

1901

}

1902

}

2796

1903

}

2797

1904

2798

1905

if(quit_now){

2799

1906

goto end;

2800

1907

}

2801

1908

2802

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

1909

ret = init_gnutls_global(pubkey, seckey);

2803

1910

if(ret == -1){

2804

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

1911

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

2805

1912

exitcode = EX_UNAVAILABLE;

2806

1913

goto end;

2807

1914

} else {

2812

1919

goto end;

2813

1920

}

2814

1921

2815

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

2816

tempdir = mkdtemp(run_tempdir);

2817

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

2818

if(debug){

2819

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

2820

run_tempdir, old_tempdir);

2821

}

2822

tempdir = mkdtemp(old_tempdir);

2823

}

2824

if(tempdir == NULL){

1922

if(mkdtemp(tempdir) == NULL){

2825

1923

perror_plus("mkdtemp");

2826

1924

goto end;

2827

1925

}

1926

tempdir_created = true;

2828

1927

2829

1928

if(quit_now){

2830

1929

goto end;

2831

1930

}

2832

1931

2833

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

2834

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

1932

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

1933

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

2835

1934

exitcode = EX_UNAVAILABLE;

2836

1935

goto end;

2837

1936

} else {

2846

1945

/* Connect directly, do not use Zeroconf */

2847

1946

/* (Mainly meant for debugging) */

2848

1947

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

2849

2850

1948

if(address == NULL){

2851

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

1949

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

2852

1950

exitcode = EX_USAGE;

2853

1951

goto end;

2854

1952

}

2857

1955

goto end;

2858

1956

}

2859

1957

2860

in_port_t port;

1958

uint16_t port;

2861

1959

errno = 0;

2862

1960

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

2863

1961

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

2864

or tmpmax != (in_port_t)tmpmax){

2865

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

1962

or tmpmax != (uint16_t)tmpmax){

1963

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

2866

1964

exitcode = EX_USAGE;

2867

1965

goto end;

2868

1966

}

2869

1967

2870

1968

if(quit_now){

2871

1969

goto end;

2872

1970

}

2873

1971

2874

port = (in_port_t)tmpmax;

1972

port = (uint16_t)tmpmax;

2875

1973

*address = '\0';

2876

1974

/* Colon in address indicates IPv6 */

2877

1975

int af;

2893

1991

}

2894

1992

2895

1993

while(not quit_now){

2896

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

2897

&mc);

1994

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

2898

1995

if(quit_now or ret == 0){

2899

1996

break;

2900

1997

}

2901

1998

if(debug){

2902

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

2903

(int)retry_interval);

1999

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

2000

(int)retry_interval);

2904

2001

}

2905

sleep((unsigned int)retry_interval);

2002

sleep((int)retry_interval);

2906

2003

}

2907

2004

2908

if(not quit_now){

2005

if (not quit_now){

2909

2006

exitcode = EXIT_SUCCESS;

2910

2007

}

2911

2008

2926

2023

config.publish_domain = 0;

2927

2024

2928

2025

/* Allocate a new server */

2929

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2930

&config, NULL, NULL, &ret);

2026

mc.server = avahi_server_new(avahi_simple_poll_get

2027

(mc.simple_poll), &config, NULL,

2028

NULL, &error);

2931

2029

2932

2030

/* Free the Avahi configuration data */

2933

2031

avahi_server_config_free(&config);

2935

2033

2936

2034

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

2937

2035

if(mc.server == NULL){

2938

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

2939

avahi_strerror(ret));

2036

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

2037

avahi_strerror(error));

2940

2038

exitcode = EX_UNAVAILABLE;

2941

2039

goto end;

2942

2040

}

2948

2046

/* Create the Avahi service browser */

2949

2047

sb = avahi_s_service_browser_new(mc.server, if_index,

2950

2048

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2951

NULL, 0, browse_callback,

2952

(void *)&mc);

2049

NULL, 0, browse_callback, NULL);

2953

2050

if(sb == NULL){

2954

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

2955

avahi_strerror(avahi_server_errno(mc.server)));

2051

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

2052

avahi_strerror(avahi_server_errno(mc.server)));

2956

2053

exitcode = EX_UNAVAILABLE;

2957

2054

goto end;

2958

2055

}

2964

2061

/* Run the main loop */

2965

2062

2966

2063

if(debug){

2967

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

2064

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

2968

2065

}

2969

2970

ret = avahi_loop_with_timeout(simple_poll,

2971

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

2066

2067

ret = avahi_loop_with_timeout(mc.simple_poll,

2068

(int)(retry_interval * 1000));

2972

2069

if(debug){

2973

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

2974

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

2070

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

2071

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

2975

2072

}

2976

2073

2977

2074

end:

2978

2075

2979

2076

if(debug){

2980

if(signal_received){

2981

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

2982

argv[0], signal_received,

2983

strsignal(signal_received));

2984

} else {

2985

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

2986

}

2077

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

2987

2078

}

2988

2079

2989

2080

/* Cleanup things */

2990

free(mc.interfaces);

2991

2992

2081

if(sb != NULL)

2993

2082

avahi_s_service_browser_free(sb);

2994

2083

2995

2084

if(mc.server != NULL)

2996

2085

avahi_server_free(mc.server);

2997

2086

2998

if(simple_poll != NULL)

2999

avahi_simple_poll_free(simple_poll);

2087

if(mc.simple_poll != NULL)

2088

avahi_simple_poll_free(mc.simple_poll);

3000

2089

3001

2090

if(gnutls_initialized){

3002

2091

gnutls_certificate_free_credentials(mc.cred);

2092

gnutls_global_deinit();

3003

2093

gnutls_dh_params_deinit(mc.dh_params);

3004

2094

}

3005

2095

3006

2096

if(gpgme_initialized){

3007

2097

gpgme_release(mc.ctx);

3008

2098

}

3009

2099

3010

2100

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

3011

2101

has seen */

3012

2102

if(mc.current_server != NULL){

3013

2103

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

3014

2104

while(mc.current_server != NULL){

3015

2105

server *next = mc.current_server->next;

3016

#ifdef __GNUC__

3017

#pragma GCC diagnostic push

3018

#pragma GCC diagnostic ignored "-Wcast-qual"

3019

#endif

3020

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

3021

#ifdef __GNUC__

3022

#pragma GCC diagnostic pop

3023

#endif

3024

2106

free(mc.current_server);

3025

2107

mc.current_server = next;

3026

2108

}

3027

2109

}

3028

2110

3029

/* Re-raise privileges */

3030

{

3031

ret = raise_privileges();

3032

if(ret != 0){

3033

errno = ret;

3034

perror_plus("Failed to raise privileges");

3035

} else {

3036

3037

/* Run network hooks */

3038

run_network_hooks("stop", interfaces_hooks != NULL ?

3039

interfaces_hooks : "", delay);

3040

3041

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

3042

{

3043

char *interface = NULL;

3044

while((interface = argz_next(interfaces_to_take_down,

3045

interfaces_to_take_down_size,

3046

interface))){

3047

ret = take_down_interface(interface);

3048

if(ret != 0){

3049

errno = ret;

3050

perror_plus("Failed to take down interface");

3051

}

3052

}

3053

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

3054

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

3055

" down\n");

3056

}

3057

}

2111

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

2112

2113

/* Take down the network interface */

2114

if(take_down_interface){

2115

/* Re-raise priviliges */

2116

errno = 0;

2117

ret = seteuid(0);

2118

if(ret == -1){

2119

perror_plus("seteuid");

3058

2120

}

3059

3060

ret = lower_privileges_permanently();

3061

if(ret != 0){

3062

errno = ret;

3063

perror_plus("Failed to lower privileges permanently");

2121

if(geteuid() == 0){

2122

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

2123

if(ret == -1){

2124

perror_plus("ioctl SIOCGIFFLAGS");

2125

} else if(network.ifr_flags & IFF_UP) {

2126

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

2127

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

2128

if(ret == -1){

2129

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2130

}

2131

}

2132

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

2133

if(ret == -1){

2134

perror_plus("close");

2135

}

2136

/* Lower privileges permanently */

2137

errno = 0;

2138

ret = setuid(uid);

2139

if(ret == -1){

2140

perror_plus("setuid");

2141

}

3064

2142

}

3065

2143

}

3066

2144

3067

free(interfaces_to_take_down);

3068

free(interfaces_hooks);

3069

3070

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

3071

uintmax_t level){

2145

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

2146

if(tempdir_created){

3072

2147

struct dirent **direntries = NULL;

3073

int dret;

3074

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

3075

O_RDONLY

3076

| O_NOFOLLOW

3077

| O_DIRECTORY

3078

| O_PATH));

3079

if(dir_fd == -1){

3080

perror_plus("open");

3081

return;

3082

}

3083

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

3084

notdotentries, alphasort);

3085

if(numentries >= 0){

2148

struct dirent *direntry = NULL;

2149

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

2150

alphasort);

2151

if (numentries > 0){

3086

2152

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

3087

if(debug){

3088

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

3089

dirname, direntries[i]->d_name);

3090

}

3091

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

3092

if(dret == -1){

3093

if(errno == EISDIR){

3094

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

3095

AT_REMOVEDIR);

3096

}

3097

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

3098

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

3099

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

3100

/* Recurse only in this special case */

3101

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

3102

dret = 0;

3103

}

3104

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

3105

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

3106

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

3107

}

3108

}

3109

free(direntries[i]);

3110

}

3111

3112

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

3113

free(direntries);

3114

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3115

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

3116

perror_plus("rmdir");

3117

}

3118

} else {

3119

perror_plus("scandirat");

3120

}

3121

close(dir_fd);

3122

}

3123

3124

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

3125

if(tempdir != NULL){

3126

clean_dir_at(-1, tempdir, 0);

2153

direntry = direntries[i];

2154

char *fullname = NULL;

2155

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

2156

direntry->d_name);

2157

if(ret < 0){

2158

perror_plus("asprintf");

2159

continue;

2160

}

2161

ret = remove(fullname);

2162

if(ret == -1){

2163

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

2164

strerror(errno));

2165

}

2166

free(fullname);

2167

}

2168

}

2169

2170

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

2171

free(direntries);

2172

if (numentries == -1){

2173

perror_plus("scandir");

2174

}

2175

ret = rmdir(tempdir);

2176

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

2177

perror_plus("rmdir");

2178

}

3127

2179

}

3128

2180

3129

2181

if(quit_now){