/mandos/trunk : revision 237.4.98

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

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*

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* Everything else is

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*

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

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

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* 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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*

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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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* 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 this program. If not, see

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

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

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*

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

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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

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#endif /* not _LARGEFILE_SOURCE */

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#ifndef _FILE_OFFSET_BITS

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#define _FILE_OFFSET_BITS 64

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#endif

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#endif /* not _FILE_OFFSET_BITS */

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

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

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stdout, ferror(), remove() */

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

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stdout, ferror() */

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

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

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

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strtof(), abort() */

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

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

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

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

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

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sockaddr_in6, PF_INET6,

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SOCK_STREAM, uid_t, gid_t, open(),

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opendir(), DIR */

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

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

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

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*/

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

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strtoimax() */

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

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

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

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EAI_SYSTEM, ENETUNREACH,

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EHOSTUNREACH, ECONNREFUSED, EPROTO,

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EIO, ENOENT, ENXIO, ENOMEM, EISDIR,

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ENOTEMPTY,

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program_invocation_short_name */

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

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#include <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() */

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

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

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

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argp_state, struct argp,

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raise() */

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

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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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

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WEXITSTATUS(), WTERMSIG() */

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

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

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argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

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argz_count() */

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

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EAI_SYSTEM, gai_strerror() */

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#ifdef __linux__

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

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init_gnutls_session(),

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GNUTLS_* */

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#include <gnutls/openpgp.h>

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* GPGME */

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

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

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#define SECKEY "seckey.txt"

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#define PUBKEY "pubkey.txt"

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

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bool debug = false;

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static const char mandos_protocol_version[] = "1";

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

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

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

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

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char *connect_to = NULL;

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const char *hookdir = HOOKDIR;

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int hookdir_fd = -1;

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uid_t uid = 65534;

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gid_t gid = 65534;

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

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typedef struct server{

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const char *ip;

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uint16_t port;

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in_port_t port;

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AvahiIfIndex if_index;

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int af;

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struct timespec last_seen;

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

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typedef struct {

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AvahiSimplePoll *simple_poll;

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168

AvahiServer *server;

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gnutls_certificate_credentials_t cred;

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unsigned int dh_bits;

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const char *priority;

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gpgme_ctx_t ctx;

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server *current_server;

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char *interfaces;

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size_t interfaces_size;

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} mandos_context;

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

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

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.dh_bits = 1024, .priority = "SECURE256"

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

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.current_server = NULL };

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/* global so signal handler can reach it*/

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AvahiSimplePoll *simple_poll;

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181

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sig_atomic_t quit_now = 0;

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int signal_received = 0;

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184

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/* Function to use when printing errors */

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void perror_plus(const char *print_text){

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int e = errno;

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

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program_invocation_short_name);

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errno = e;

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perror(print_text);

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192

}

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194

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

195

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

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va_list ap;

197

va_start (ap, format);

198

199

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

200

program_invocation_short_name));

201

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

202

}

203

173

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/*

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

175

206

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

176

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* "buffer_length" is how much is already used.

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208

*/

209

__attribute__((nonnull, warn_unused_result))

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210

size_t incbuffer(char **buffer, size_t buffer_length,

179

size_t buffer_capacity){

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size_t buffer_capacity){

180

212

if(buffer_length + BUFFER_SIZE > buffer_capacity){

181

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

182

if(buffer == NULL){

213

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

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if(new_buf == NULL){

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int old_errno = errno;

216

free(*buffer);

217

errno = old_errno;

218

*buffer = NULL;

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return 0;

184

220

}

221

*buffer = new_buf;

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buffer_capacity += BUFFER_SIZE;

186

223

}

187

224

return buffer_capacity;

188

225

}

189

226

190

227

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

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int add_server(const char *ip, uint16_t port,

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AvahiIfIndex if_index,

193

int af){

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){

194

231

int ret;

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232

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

196

233

if(new_server == NULL){

197

234

perror_plus("malloc");

198

return -1;

235

return false;

199

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}

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

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.port = port,

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.if_index = if_index,

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.af = af };

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.port = port,

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.if_index = if_index,

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.af = af };

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if(new_server->ip == NULL){

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242

perror_plus("strdup");

206

return -1;

243

free(new_server);

244

return false;

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}

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

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if(ret == -1){

248

perror_plus("clock_gettime");

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#ifdef __GNUC__

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#pragma GCC diagnostic push

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#pragma GCC diagnostic ignored "-Wcast-qual"

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#endif

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

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#ifdef __GNUC__

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#pragma GCC diagnostic pop

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#endif

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free(new_server);

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return false;

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}

208

260

/* Special case of first server */

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if (mc.current_server == NULL){

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if(*current_server == NULL){

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new_server->next = new_server;

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263

new_server->prev = new_server;

212

mc.current_server = new_server;

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

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*current_server = new_server;

214

265

} else {

215

new_server->next = mc.current_server;

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

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

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new_server->next = *current_server;

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

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new_server->prev->next = new_server;

218

mc.current_server->prev = new_server;

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}

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

221

if(ret == -1){

222

perror_plus("clock_gettime");

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return -1;

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}

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return 0;

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(*current_server)->prev = new_server;

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}

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return true;

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}

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/*

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* Initialize GPGME.

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*/

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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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__attribute__((nonnull, warn_unused_result))

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static bool init_gpgme(const char * const seckey,

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const char * const pubkey,

281

const char * const tempdir,

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mandos_context *mc){

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gpgme_error_t rc;

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gpgme_engine_info_t engine_info;

235

285

236

237

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/*

238

287

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

239

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*/

240

bool import_key(const char *filename){

289

bool import_key(const char * const filename){

241

290

int ret;

242

291

int fd;

243

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gpgme_data_t pgp_data;

250

299

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

252

301

if(rc != GPG_ERR_NO_ERROR){

253

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

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gpgme_strsource(rc), gpgme_strerror(rc));

302

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

303

gpgme_strsource(rc), gpgme_strerror(rc));

255

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return false;

256

305

}

257

306

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rc = gpgme_op_import(mc.ctx, pgp_data);

307

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

259

308

if(rc != GPG_ERR_NO_ERROR){

260

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

261

gpgme_strsource(rc), gpgme_strerror(rc));

309

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

310

gpgme_strsource(rc), gpgme_strerror(rc));

262

311

return false;

263

312

}

264

313

265

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

314

ret = close(fd);

266

315

if(ret == -1){

267

316

perror_plus("close");

268

317

}

271

320

}

272

321

273

322

if(debug){

274

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

323

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

275

324

}

276

325

277

326

/* Init GPGME */

278

327

gpgme_check_version(NULL);

279

328

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

280

329

if(rc != GPG_ERR_NO_ERROR){

281

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

282

gpgme_strsource(rc), gpgme_strerror(rc));

330

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

331

gpgme_strsource(rc), gpgme_strerror(rc));

283

332

return false;

284

333

}

285

334

286

335

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

287

336

rc = gpgme_get_engine_info(&engine_info);

288

337

if(rc != GPG_ERR_NO_ERROR){

289

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

290

gpgme_strsource(rc), gpgme_strerror(rc));

338

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

339

gpgme_strsource(rc), gpgme_strerror(rc));

291

340

return false;

292

341

}

293

342

while(engine_info != NULL){

299

348

engine_info = engine_info->next;

300

349

}

301

350

if(engine_info == NULL){

302

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

351

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

352

tempdir);

303

353

return false;

304

354

}

305

355

306

356

/* Create new GPGME "context" */

307

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

357

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

308

358

if(rc != GPG_ERR_NO_ERROR){

309

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

310

gpgme_strsource(rc), gpgme_strerror(rc));

359

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

360

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

361

gpgme_strerror(rc));

311

362

return false;

312

363

}

313

364

322

373

* Decrypt OpenPGP data.

323

374

* Returns -1 on error

324

375

*/

376

__attribute__((nonnull, warn_unused_result))

325

377

static ssize_t pgp_packet_decrypt(const char *cryptotext,

326

378

size_t crypto_size,

327

char **plaintext){

379

char **plaintext,

380

mandos_context *mc){

328

381

gpgme_data_t dh_crypto, dh_plain;

329

382

gpgme_error_t rc;

330

383

ssize_t ret;

332

385

ssize_t plaintext_length = 0;

333

386

334

387

if(debug){

335

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

388

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

336

389

}

337

390

338

391

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

339

392

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

340

393

0);

341

394

if(rc != GPG_ERR_NO_ERROR){

342

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

343

gpgme_strsource(rc), gpgme_strerror(rc));

395

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

396

gpgme_strsource(rc), gpgme_strerror(rc));

344

397

return -1;

345

398

}

346

399

347

400

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

348

401

rc = gpgme_data_new(&dh_plain);

349

402

if(rc != GPG_ERR_NO_ERROR){

350

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

351

gpgme_strsource(rc), gpgme_strerror(rc));

403

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

404

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

405

gpgme_strsource(rc), gpgme_strerror(rc));

352

406

gpgme_data_release(dh_crypto);

353

407

return -1;

354

408

}

355

409

356

410

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

357

411

data buffer */

358

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

412

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

359

413

if(rc != GPG_ERR_NO_ERROR){

360

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

361

gpgme_strsource(rc), gpgme_strerror(rc));

414

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

415

gpgme_strsource(rc), gpgme_strerror(rc));

362

416

plaintext_length = -1;

363

417

if(debug){

364

418

gpgme_decrypt_result_t result;

365

result = gpgme_op_decrypt_result(mc.ctx);

419

result = gpgme_op_decrypt_result(mc->ctx);

366

420

if(result == NULL){

367

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

421

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

368

422

} else {

369

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

370

result->unsupported_algorithm);

371

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

372

result->wrong_key_usage);

423

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

424

result->unsupported_algorithm);

425

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

426

result->wrong_key_usage);

373

427

if(result->file_name != NULL){

374

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

428

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

375

429

}

376

430

gpgme_recipient_t recipient;

377

431

recipient = result->recipients;

378

432

while(recipient != NULL){

379

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

380

gpgme_pubkey_algo_name(recipient->pubkey_algo));

381

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

382

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

383

recipient->status == GPG_ERR_NO_SECKEY

384

? "No" : "Yes");

433

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

434

gpgme_pubkey_algo_name

435

(recipient->pubkey_algo));

436

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

437

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

438

recipient->status == GPG_ERR_NO_SECKEY

439

? "No" : "Yes");

385

440

recipient = recipient->next;

386

441

}

387

442

}

390

445

}

391

446

392

447

if(debug){

393

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

448

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

394

449

}

395

450

396

451

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

403

458

*plaintext = NULL;

404

459

while(true){

405

460

plaintext_capacity = incbuffer(plaintext,

406

(size_t)plaintext_length,

407

plaintext_capacity);

461

(size_t)plaintext_length,

462

plaintext_capacity);

408

463

if(plaintext_capacity == 0){

409

perror_plus("incbuffer");

410

plaintext_length = -1;

411

goto decrypt_end;

464

perror_plus("incbuffer");

465

plaintext_length = -1;

466

goto decrypt_end;

412

467

}

413

468

414

469

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

427

482

}

428

483

429

484

if(debug){

430

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

485

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

431

486

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

432

487

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

433

488

}

444

499

return plaintext_length;

445

500

}

446

501

447

static const char * safer_gnutls_strerror(int value){

448

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

449

-Wunreachable-code */

450

if(ret == NULL)

451

ret = "(unknown)";

452

return ret;

502

__attribute__((warn_unused_result, const))

503

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

504

if(str == NULL)

505

return "(unknown)";

506

return str;

507

}

508

509

__attribute__((warn_unused_result))

510

static const char *safer_gnutls_strerror(int value){

511

const char *ret = gnutls_strerror(value);

512

return safe_string(ret);

453

513

}

454

514

455

515

/* GnuTLS log function callback */

516

__attribute__((nonnull))

456

517

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

457

518

const char* string){

458

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

519

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

459

520

}

460

521

522

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

461

523

static int init_gnutls_global(const char *pubkeyfilename,

462

const char *seckeyfilename){

524

const char *seckeyfilename,

525

const char *dhparamsfilename,

526

mandos_context *mc){

463

527

int ret;

528

unsigned int uret;

464

529

465

530

if(debug){

466

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

467

}

468

469

ret = gnutls_global_init();

470

if(ret != GNUTLS_E_SUCCESS){

471

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

472

safer_gnutls_strerror(ret));

473

return -1;

531

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

474

532

}

475

533

476

534

if(debug){

482

540

}

483

541

484

542

/* OpenPGP credentials */

485

ret = gnutls_certificate_allocate_credentials(&mc.cred);

543

ret = gnutls_certificate_allocate_credentials(&mc->cred);

486

544

if(ret != GNUTLS_E_SUCCESS){

487

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

488

safer_gnutls_strerror(ret));

489

gnutls_global_deinit();

545

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

546

safer_gnutls_strerror(ret));

490

547

return -1;

491

548

}

492

549

493

550

if(debug){

494

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

495

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

496

seckeyfilename);

551

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

552

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

553

pubkeyfilename,

554

seckeyfilename);

497

555

}

498

556

499

557

ret = gnutls_certificate_set_openpgp_key_file

500

(mc.cred, pubkeyfilename, seckeyfilename,

558

(mc->cred, pubkeyfilename, seckeyfilename,

501

559

GNUTLS_OPENPGP_FMT_BASE64);

502

560

if(ret != GNUTLS_E_SUCCESS){

503

fprintf(stderr,

504

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

505

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

506

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

507

safer_gnutls_strerror(ret));

561

fprintf_plus(stderr,

562

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

563

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

564

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

565

safer_gnutls_strerror(ret));

508

566

goto globalfail;

509

567

}

510

568

511

569

/* GnuTLS server initialization */

512

ret = gnutls_dh_params_init(&mc.dh_params);

513

if(ret != GNUTLS_E_SUCCESS){

514

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

515

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

516

goto globalfail;

517

}

518

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

519

if(ret != GNUTLS_E_SUCCESS){

520

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

521

safer_gnutls_strerror(ret));

522

goto globalfail;

523

}

524

525

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

570

ret = gnutls_dh_params_init(&mc->dh_params);

571

if(ret != GNUTLS_E_SUCCESS){

572

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

573

" initialization: %s\n",

574

safer_gnutls_strerror(ret));

575

goto globalfail;

576

}

577

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

578

if(dhparamsfilename != NULL){

579

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

580

do {

581

int dhpfile = open(dhparamsfilename, O_RDONLY);

582

if(dhpfile == -1){

583

perror_plus("open");

584

dhparamsfilename = NULL;

585

break;

586

}

587

size_t params_capacity = 0;

588

while(true){

589

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

590

(size_t)params.size,

591

(size_t)params_capacity);

592

if(params_capacity == 0){

593

perror_plus("incbuffer");

594

free(params.data);

595

params.data = NULL;

596

dhparamsfilename = NULL;

597

break;

598

}

599

ssize_t bytes_read = read(dhpfile,

600

params.data + params.size,

601

BUFFER_SIZE);

602

/* EOF */

603

if(bytes_read == 0){

604

break;

605

}

606

/* check bytes_read for failure */

607

if(bytes_read < 0){

608

perror_plus("read");

609

free(params.data);

610

params.data = NULL;

611

dhparamsfilename = NULL;

612

break;

613

}

614

params.size += (unsigned int)bytes_read;

615

}

616

ret = close(dhpfile);

617

if(ret == -1){

618

perror_plus("close");

619

}

620

if(params.data == NULL){

621

dhparamsfilename = NULL;

622

}

623

if(dhparamsfilename == NULL){

624

break;

625

}

626

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

627

GNUTLS_X509_FMT_PEM);

628

if(ret != GNUTLS_E_SUCCESS){

629

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

630

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

631

safer_gnutls_strerror(ret));

632

dhparamsfilename = NULL;

633

}

634

free(params.data);

635

} while(false);

636

}

637

if(dhparamsfilename == NULL){

638

if(mc->dh_bits == 0){

639

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

640

/* Try to read the private key file */

641

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

642

do {

643

int secfile = open(seckeyfilename, O_RDONLY);

644

if(secfile == -1){

645

perror_plus("open");

646

break;

647

}

648

size_t buffer_capacity = 0;

649

while(true){

650

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

651

(size_t)buffer.size,

652

(size_t)buffer_capacity);

653

if(buffer_capacity == 0){

654

perror_plus("incbuffer");

655

free(buffer.data);

656

buffer.data = NULL;

657

break;

658

}

659

ssize_t bytes_read = read(secfile,

660

buffer.data + buffer.size,

661

BUFFER_SIZE);

662

/* EOF */

663

if(bytes_read == 0){

664

break;

665

}

666

/* check bytes_read for failure */

667

if(bytes_read < 0){

668

perror_plus("read");

669

free(buffer.data);

670

buffer.data = NULL;

671

break;

672

}

673

buffer.size += (unsigned int)bytes_read;

674

}

675

close(secfile);

676

} while(false);

677

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

678

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

679

if(buffer.data != NULL){

680

{

681

gnutls_openpgp_privkey_t privkey = NULL;

682

ret = gnutls_openpgp_privkey_init(&privkey);

683

if(ret != GNUTLS_E_SUCCESS){

684

fprintf_plus(stderr, "Error initializing OpenPGP key"

685

" structure: %s",

686

safer_gnutls_strerror(ret));

687

free(buffer.data);

688

buffer.data = NULL;

689

} else {

690

ret = gnutls_openpgp_privkey_import

691

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

692

if(ret != GNUTLS_E_SUCCESS){

693

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

694

safer_gnutls_strerror(ret));

695

privkey = NULL;

696

}

697

free(buffer.data);

698

buffer.data = NULL;

699

if(privkey != NULL){

700

/* Use private key to suggest an appropriate

701

sec_param */

702

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

703

gnutls_openpgp_privkey_deinit(privkey);

704

if(debug){

705

fprintf_plus(stderr, "This OpenPGP key implies using"

706

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

707

safe_string(gnutls_sec_param_get_name

708

(sec_param)));

709

}

710

}

711

}

712

}

713

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

714

/* Err on the side of caution */

715

sec_param = GNUTLS_SEC_PARAM_ULTRA;

716

if(debug){

717

fprintf_plus(stderr, "Falling back to security parameter"

718

" \"%s\"\n",

719

safe_string(gnutls_sec_param_get_name

720

(sec_param)));

721

}

722

}

723

}

724

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

725

if(uret != 0){

726

mc->dh_bits = uret;

727

if(debug){

728

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

729

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

730

safe_string(gnutls_sec_param_get_name

731

(sec_param)),

732

mc->dh_bits);

733

}

734

} else {

735

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

736

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

737

safe_string(gnutls_sec_param_get_name

738

(sec_param)),

739

safer_gnutls_strerror(ret));

740

goto globalfail;

741

}

742

} else if(debug){

743

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

744

mc->dh_bits);

745

}

746

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

747

if(ret != GNUTLS_E_SUCCESS){

748

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

749

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

750

safer_gnutls_strerror(ret));

751

goto globalfail;

752

}

753

}

754

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

526

755

527

756

return 0;

528

757

529

758

globalfail:

530

759

531

gnutls_certificate_free_credentials(mc.cred);

532

gnutls_global_deinit();

533

gnutls_dh_params_deinit(mc.dh_params);

760

gnutls_certificate_free_credentials(mc->cred);

761

gnutls_dh_params_deinit(mc->dh_params);

534

762

return -1;

535

763

}

536

764

537

static int init_gnutls_session(gnutls_session_t *session){

765

__attribute__((nonnull, warn_unused_result))

766

static int init_gnutls_session(gnutls_session_t *session,

767

mandos_context *mc){

538

768

int ret;

539

769

/* GnuTLS session creation */

540

770

do {

544

774

}

545

775

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

546

776

if(ret != GNUTLS_E_SUCCESS){

547

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

548

safer_gnutls_strerror(ret));

777

fprintf_plus(stderr,

778

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

779

safer_gnutls_strerror(ret));

549

780

}

550

781

551

782

{

552

783

const char *err;

553

784

do {

554

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

785

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

555

786

if(quit_now){

556

787

gnutls_deinit(*session);

557

788

return -1;

558

789

}

559

790

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

560

791

if(ret != GNUTLS_E_SUCCESS){

561

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

562

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

563

safer_gnutls_strerror(ret));

792

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

793

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

794

safer_gnutls_strerror(ret));

564

795

gnutls_deinit(*session);

565

796

return -1;

566

797

}

568

799

569

800

do {

570

801

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

571

mc.cred);

802

mc->cred);

572

803

if(quit_now){

573

804

gnutls_deinit(*session);

574

805

return -1;

575

806

}

576

807

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

577

808

if(ret != GNUTLS_E_SUCCESS){

578

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

579

safer_gnutls_strerror(ret));

809

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

810

safer_gnutls_strerror(ret));

580

811

gnutls_deinit(*session);

581

812

return -1;

582

813

}

584

815

/* ignore client certificate if any. */

585

816

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

586

817

587

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

588

589

818

return 0;

590

819

}

591

820

593

822

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

594

823

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

595

824

825

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

826

__attribute__((warn_unused_result))

827

int raise_privileges(void){

828

int old_errno = errno;

829

int ret = 0;

830

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

831

ret = errno;

832

}

833

errno = old_errno;

834

return ret;

835

}

836

837

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

838

__attribute__((warn_unused_result))

839

int raise_privileges_permanently(void){

840

int old_errno = errno;

841

int ret = raise_privileges();

842

if(ret != 0){

843

errno = old_errno;

844

return ret;

845

}

846

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

847

ret = errno;

848

}

849

errno = old_errno;

850

return ret;

851

}

852

853

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

854

__attribute__((warn_unused_result))

855

int lower_privileges(void){

856

int old_errno = errno;

857

int ret = 0;

858

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

859

ret = errno;

860

}

861

errno = old_errno;

862

return ret;

863

}

864

865

/* Lower privileges permanently */

866

__attribute__((warn_unused_result))

867

int lower_privileges_permanently(void){

868

int old_errno = errno;

869

int ret = 0;

870

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

871

ret = errno;

872

}

873

errno = old_errno;

874

return ret;

875

}

876

877

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

878

__attribute__((nonnull, warn_unused_result))

879

static bool add_delete_local_route(const bool add,

880

const char *address,

881

AvahiIfIndex if_index){

882

int ret;

883

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

884

char add_arg[] = "add";

885

char delete_arg[] = "delete";

886

char debug_flag[] = "--debug";

887

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

888

if(pluginhelperdir == NULL){

889

if(debug){

890

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

891

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

892

}

893

return false;

894

}

895

896

char interface[IF_NAMESIZE];

897

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

898

perror_plus("if_indextoname");

899

return false;

900

}

901

902

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

903

if(devnull == -1){

904

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

905

return false;

906

}

907

pid_t pid = fork();

908

if(pid == 0){

909

/* Child */

910

/* Raise privileges */

911

errno = raise_privileges_permanently();

912

if(errno != 0){

913

perror_plus("Failed to raise privileges");

914

/* _exit(EX_NOPERM); */

915

} else {

916

/* Set group */

917

errno = 0;

918

ret = setgid(0);

919

if(ret == -1){

920

perror_plus("setgid");

921

_exit(EX_NOPERM);

922

}

923

/* Reset supplementary groups */

924

errno = 0;

925

ret = setgroups(0, NULL);

926

if(ret == -1){

927

perror_plus("setgroups");

928

_exit(EX_NOPERM);

929

}

930

}

931

ret = dup2(devnull, STDIN_FILENO);

932

if(ret == -1){

933

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

934

_exit(EX_OSERR);

935

}

936

ret = close(devnull);

937

if(ret == -1){

938

perror_plus("close");

939

_exit(EX_OSERR);

940

}

941

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

942

if(ret == -1){

943

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

944

_exit(EX_OSERR);

945

}

946

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

947

O_RDONLY

948

| O_DIRECTORY

949

| O_PATH

950

| O_CLOEXEC));

951

if(helperdir_fd == -1){

952

perror_plus("open");

953

_exit(EX_UNAVAILABLE);

954

}

955

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

956

helper, O_RDONLY));

957

if(helper_fd == -1){

958

perror_plus("openat");

959

close(helperdir_fd);

960

_exit(EX_UNAVAILABLE);

961

}

962

close(helperdir_fd);

963

#ifdef __GNUC__

964

#pragma GCC diagnostic push

965

#pragma GCC diagnostic ignored "-Wcast-qual"

966

#endif

967

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

968

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

969

interface, debug ? debug_flag : NULL, NULL },

970

environ) == -1){

971

#ifdef __GNUC__

972

#pragma GCC diagnostic pop

973

#endif

974

perror_plus("fexecve");

975

_exit(EXIT_FAILURE);

976

}

977

}

978

if(pid == -1){

979

perror_plus("fork");

980

return false;

981

}

982

int status;

983

pid_t pret = -1;

984

errno = 0;

985

do {

986

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

987

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

988

int errno_raising = 0;

989

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

990

errno_raising = errno;

991

perror_plus("Failed to raise privileges in order to"

992

" kill helper program");

993

}

994

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

995

perror_plus("kill");

996

}

997

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

998

perror_plus("Failed to lower privileges after killing"

999

" helper program");

1000

}

1001

return false;

1002

}

1003

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

1004

if(pret == -1){

1005

perror_plus("waitpid");

1006

return false;

1007

}

1008

if(WIFEXITED(status)){

1009

if(WEXITSTATUS(status) != 0){

1010

fprintf_plus(stderr, "Error: iprouteadddel exited"

1011

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

1012

return false;

1013

}

1014

return true;

1015

}

1016

if(WIFSIGNALED(status)){

1017

fprintf_plus(stderr, "Error: iprouteadddel died by"

1018

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

1019

return false;

1020

}

1021

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

1022

return false;

1023

}

1024

1025

__attribute__((nonnull, warn_unused_result))

1026

static bool add_local_route(const char *address,

1027

AvahiIfIndex if_index){

1028

if(debug){

1029

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

1030

}

1031

return add_delete_local_route(true, address, if_index);

1032

}

1033

1034

__attribute__((nonnull, warn_unused_result))

1035

static bool delete_local_route(const char *address,

1036

AvahiIfIndex if_index){

1037

if(debug){

1038

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

1039

}

1040

return add_delete_local_route(false, address, if_index);

1041

}

1042

596

1043

/* Called when a Mandos server is found */

597

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

1044

__attribute__((nonnull, warn_unused_result))

1045

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

598

1046

AvahiIfIndex if_index,

599

int af){

1047

int af, mandos_context *mc){

600

1048

int ret, tcp_sd = -1;

601

1049

ssize_t sret;

602

union {

603

struct sockaddr_in in;

604

struct sockaddr_in6 in6;

605

} to;

1050

struct sockaddr_storage to;

606

1051

char *buffer = NULL;

607

1052

char *decrypted_buffer = NULL;

608

1053

size_t buffer_length = 0;

611

1056

int retval = -1;

612

1057

gnutls_session_t session;

613

1058

int pf; /* Protocol family */

1059

bool route_added = false;

614

1060

615

1061

errno = 0;

616

1062

627

1073

pf = PF_INET;

628

1074

break;

629

1075

default:

630

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

1076

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

631

1077

errno = EINVAL;

632

1078

return -1;

633

1079

}

634

1080

635

ret = init_gnutls_session(&session);

1081

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

1082

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

1083

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

1084

bool match = false;

1085

{

1086

char *interface = NULL;

1087

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

1088

mc->interfaces_size,

1089

interface))){

1090

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

1091

match = true;

1092

break;

1093

}

1094

}

1095

}

1096

if(not match){

1097

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

1098

connect to the server */

1099

if(debug){

1100

char interface[IF_NAMESIZE];

1101

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

1102

perror_plus("if_indextoname");

1103

} else {

1104

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

1105

" \"%s\"\n",

1106

if_indextoname((unsigned int)if_index,

1107

interface));

1108

}

1109

}

1110

return -1;

1111

}

1112

}

1113

1114

ret = init_gnutls_session(&session, mc);

636

1115

if(ret != 0){

637

1116

return -1;

638

1117

}

639

1118

640

1119

if(debug){

641

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

642

"\n", ip, port);

1120

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

1121

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

643

1122

}

644

1123

645

tcp_sd = socket(pf, SOCK_STREAM, 0);

1124

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

646

1125

if(tcp_sd < 0){

647

1126

int e = errno;

648

1127

perror_plus("socket");

655

1134

goto mandos_end;

656

1135

}

657

1136

658

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

659

1137

if(af == AF_INET6){

660

to.in6.sin6_family = (sa_family_t)af;

661

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

1138

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

1139

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

1140

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

662

1141

} else { /* IPv4 */

663

to.in.sin_family = (sa_family_t)af;

664

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

1142

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

1143

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

1144

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

665

1145

}

666

1146

if(ret < 0 ){

667

1147

int e = errno;

671

1151

}

672

1152

if(ret == 0){

673

1153

int e = errno;

674

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

1154

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

675

1155

errno = e;

676

1156

goto mandos_end;

677

1157

}

678

1158

if(af == AF_INET6){

679

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

680

-Wconversion and

681

-Wunreachable-code */

682

683

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

684

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

685

-Wunreachable-code*/

1159

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

1160

if(IN6_IS_ADDR_LINKLOCAL

1161

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

686

1162

if(if_index == AVAHI_IF_UNSPEC){

687

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

688

" without a network interface\n");

1163

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

1164

" incomplete without a network interface\n");

689

1165

errno = EINVAL;

690

1166

goto mandos_end;

691

1167

}

692

1168

/* Set the network interface number as scope */

693

to.in6.sin6_scope_id = (uint32_t)if_index;

1169

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

694

1170

}

695

1171

} else {

696

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

697

-Wconversion and

698

-Wunreachable-code */

1172

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

699

1173

}

700

1174

701

1175

if(quit_now){

709

1183

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

710

1184

perror_plus("if_indextoname");

711

1185

} else {

712

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

713

ip, interface, port);

1186

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

1187

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

714

1188

}

715

1189

} else {

716

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

717

port);

1190

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

1191

ip, (uintmax_t)port);

718

1192

}

719

1193

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

720

1194

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

721

const char *pcret;

722

if(af == AF_INET6){

723

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

724

sizeof(addrstr));

725

} else {

726

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

727

sizeof(addrstr));

728

}

729

if(pcret == NULL){

730

perror_plus("inet_ntop");

731

} else {

732

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

733

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

734

}

735

}

736

}

737

738

if(quit_now){

739

errno = EINTR;

740

goto mandos_end;

741

}

742

743

if(af == AF_INET6){

744

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

745

} else {

746

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

747

}

748

if(ret < 0){

749

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

750

int e = errno;

751

perror_plus("connect");

752

errno = e;

753

}

754

goto mandos_end;

755

}

756

757

if(quit_now){

758

errno = EINTR;

759

goto mandos_end;

1195

if(af == AF_INET6){

1196

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

1197

sizeof(struct sockaddr_in6),

1198

addrstr, sizeof(addrstr), NULL, 0,

1199

NI_NUMERICHOST);

1200

} else {

1201

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

1202

sizeof(struct sockaddr_in),

1203

addrstr, sizeof(addrstr), NULL, 0,

1204

NI_NUMERICHOST);

1205

}

1206

if(ret == EAI_SYSTEM){

1207

perror_plus("getnameinfo");

1208

} else if(ret != 0) {

1209

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

1210

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

1211

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

1212

}

1213

}

1214

1215

if(quit_now){

1216

errno = EINTR;

1217

goto mandos_end;

1218

}

1219

1220

while(true){

1221

if(af == AF_INET6){

1222

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

1223

sizeof(struct sockaddr_in6));

1224

} else {

1225

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

1226

sizeof(struct sockaddr_in));

1227

}

1228

if(ret < 0){

1229

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

1230

and if_index != AVAHI_IF_UNSPEC

1231

and connect_to == NULL

1232

and not route_added and

1233

((af == AF_INET6 and not

1234

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1235

&to)->sin6_addr)))

1236

or (af == AF_INET and

1237

/* Not a a IPv4LL address */

1238

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

1239

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

1240

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

1241

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

1242

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

1243

connect to a Mandos server announced by Avahi on a server

1244

host with a global address. Work around this by retrying

1245

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

1246

1247

Avahi bug reference:

1248

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

1249

https://bugs.debian.org/587961

1250

*/

1251

if(debug){

1252

fprintf_plus(stderr, "Mandos server unreachable, trying"

1253

" direct route\n");

1254

}

1255

int e = errno;

1256

route_added = add_local_route(ip, if_index);

1257

if(route_added){

1258

continue;

1259

}

1260

errno = e;

1261

}

1262

if(errno != ECONNREFUSED or debug){

1263

int e = errno;

1264

perror_plus("connect");

1265

errno = e;

1266

}

1267

goto mandos_end;

1268

}

1269

1270

if(quit_now){

1271

errno = EINTR;

1272

goto mandos_end;

1273

}

1274

break;

760

1275

}

761

1276

762

1277

const char *out = mandos_protocol_version;

764

1279

while(true){

765

1280

size_t out_size = strlen(out);

766

1281

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

767

out_size - written));

1282

out_size - written));

768

1283

if(ret == -1){

769

1284

int e = errno;

770

1285

perror_plus("write");

790

1305

}

791

1306

792

1307

if(debug){

793

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

1308

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

794

1309

}

795

1310

796

1311

if(quit_now){

798

1313

goto mandos_end;

799

1314

}

800

1315

801

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

802

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

1316

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

1317

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

1318

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

1319

gnutls_transport_set_ptr(session,

1320

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

803

1321

804

1322

if(quit_now){

805

1323

errno = EINTR;

816

1334

817

1335

if(ret != GNUTLS_E_SUCCESS){

818

1336

if(debug){

819

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

1337

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

820

1338

gnutls_perror(ret);

821

1339

}

822

1340

errno = EPROTO;

826

1344

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

827

1345

828

1346

if(debug){

829

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

830

ip);

1347

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

1348

" %s\n", ip);

831

1349

}

832

1350

833

1351

while(true){

838

1356

}

839

1357

840

1358

buffer_capacity = incbuffer(&buffer, buffer_length,

841

buffer_capacity);

1359

buffer_capacity);

842

1360

if(buffer_capacity == 0){

843

1361

int e = errno;

844

1362

perror_plus("incbuffer");

871

1389

}

872

1390

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

873

1391

if(ret < 0){

874

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

1392

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

1393

"***\n");

875

1394

gnutls_perror(ret);

876

1395

errno = EPROTO;

877

1396

goto mandos_end;

878

1397

}

879

1398

break;

880

1399

default:

881

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

882

" encrypted session with Mandos server\n");

1400

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

1401

" encrypted session with Mandos server\n");

883

1402

gnutls_bye(session, GNUTLS_SHUT_RDWR);

884

1403

errno = EIO;

885

1404

goto mandos_end;

890

1409

}

891

1410

892

1411

if(debug){

893

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

1412

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

894

1413

}

895

1414

896

1415

if(quit_now){

908

1427

909

1428

if(buffer_length > 0){

910

1429

ssize_t decrypted_buffer_size;

911

decrypted_buffer_size = pgp_packet_decrypt(buffer,

912

buffer_length,

913

&decrypted_buffer);

1430

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

1431

&decrypted_buffer, mc);

914

1432

if(decrypted_buffer_size >= 0){

915

1433

1434

clearerr(stdout);

916

1435

written = 0;

917

1436

while(written < (size_t) decrypted_buffer_size){

918

1437

if(quit_now){

926

1445

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

927

1446

int e = errno;

928

1447

if(debug){

929

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

930

strerror(errno));

1448

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

1449

strerror(errno));

931

1450

}

932

1451

errno = e;

933

1452

goto mandos_end;

934

1453

}

935

1454

written += (size_t)ret;

936

1455

}

1456

ret = fflush(stdout);

1457

if(ret != 0){

1458

int e = errno;

1459

if(debug){

1460

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

1461

strerror(errno));

1462

}

1463

errno = e;

1464

goto mandos_end;

1465

}

937

1466

retval = 0;

938

1467

}

939

1468

}

942

1471

943

1472

mandos_end:

944

1473

{

1474

if(route_added){

1475

if(not delete_local_route(ip, if_index)){

1476

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

1477

" interface %d", ip, if_index);

1478

}

1479

}

945

1480

int e = errno;

946

1481

free(decrypted_buffer);

947

1482

free(buffer);

948

1483

if(tcp_sd >= 0){

949

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

1484

ret = close(tcp_sd);

950

1485

}

951

1486

if(ret == -1){

952

1487

if(e == 0){

977

1512

AVAHI_GCC_UNUSED AvahiStringList *txt,

978

1513

AVAHI_GCC_UNUSED AvahiLookupResultFlags

979

1514

flags,

980

AVAHI_GCC_UNUSED void* userdata){

981

assert(r);

1515

void *mc){

1516

if(r == NULL){

1517

return;

1518

}

982

1519

983

1520

/* Called whenever a service has been resolved successfully or

984

1521

timed out */

985

1522

986

1523

if(quit_now){

1524

avahi_s_service_resolver_free(r);

987

1525

return;

988

1526

}

989

1527

990

1528

switch(event){

991

1529

default:

992

1530

case AVAHI_RESOLVER_FAILURE:

993

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

994

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

995

avahi_strerror(avahi_server_errno(mc.server)));

1531

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

1532

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

1533

domain,

1534

avahi_strerror(avahi_server_errno

1535

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

996

1536

break;

997

1537

998

1538

case AVAHI_RESOLVER_FOUND:

1000

1540

char ip[AVAHI_ADDRESS_STR_MAX];

1001

1541

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

1002

1542

if(debug){

1003

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

1004

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

1005

ip, (intmax_t)interface, port);

1543

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

1544

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

1545

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

1006

1546

}

1007

int ret = start_mandos_communication(ip, port, interface,

1008

avahi_proto_to_af(proto));

1547

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

1548

interface,

1549

avahi_proto_to_af(proto),

1550

mc);

1009

1551

if(ret == 0){

1010

avahi_simple_poll_quit(mc.simple_poll);

1552

avahi_simple_poll_quit(simple_poll);

1011

1553

} else {

1012

ret = add_server(ip, port, interface,

1013

avahi_proto_to_af(proto));

1554

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

1555

avahi_proto_to_af(proto),

1556

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

1557

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

1558

" list\n", name);

1559

}

1014

1560

}

1015

1561

}

1016

1562

}

1026

1572

const char *domain,

1027

1573

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1028

1574

flags,

1029

AVAHI_GCC_UNUSED void* userdata){

1030

assert(b);

1575

void *mc){

1576

if(b == NULL){

1577

return;

1578

}

1031

1579

1032

1580

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

1033

1581

is removed from the LAN */

1040

1588

default:

1041

1589

case AVAHI_BROWSER_FAILURE:

1042

1590

1043

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

1044

avahi_strerror(avahi_server_errno(mc.server)));

1045

avahi_simple_poll_quit(mc.simple_poll);

1591

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

1592

avahi_strerror(avahi_server_errno

1593

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

1594

avahi_simple_poll_quit(simple_poll);

1046

1595

return;

1047

1596

1048

1597

case AVAHI_BROWSER_NEW:

1051

1600

the callback function is called the Avahi server will free the

1052

1601

resolver for us. */

1053

1602

1054

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

1055

name, type, domain, protocol, 0,

1056

resolve_callback, NULL) == NULL)

1057

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

1058

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

1603

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

1604

interface, protocol, name, type,

1605

domain, protocol, 0,

1606

resolve_callback, mc) == NULL)

1607

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

1608

" %s\n", name,

1609

avahi_strerror(avahi_server_errno

1610

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

1059

1611

break;

1060

1612

1061

1613

case AVAHI_BROWSER_REMOVE:

1064

1616

case AVAHI_BROWSER_ALL_FOR_NOW:

1065

1617

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1066

1618

if(debug){

1067

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

1619

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

1620

" searching...\n");

1068

1621

}

1069

1622

break;

1070

1623

}

1079

1632

signal_received = sig;

1080

1633

int old_errno = errno;

1081

1634

/* set main loop to exit */

1082

if(mc.simple_poll != NULL){

1083

avahi_simple_poll_quit(mc.simple_poll);

1635

if(simple_poll != NULL){

1636

avahi_simple_poll_quit(simple_poll);

1084

1637

}

1085

1638

errno = old_errno;

1086

1639

}

1087

1640

1641

__attribute__((nonnull, warn_unused_result))

1642

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

1643

int ret;

1644

int old_errno;

1645

1646

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

1647

if(s < 0){

1648

old_errno = errno;

1649

perror_plus("socket");

1650

errno = old_errno;

1651

return false;

1652

}

1653

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

1654

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

1655

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1656

if(ret == -1){

1657

if(debug){

1658

old_errno = errno;

1659

perror_plus("ioctl SIOCGIFFLAGS");

1660

errno = old_errno;

1661

}

1662

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

1663

old_errno = errno;

1664

perror_plus("close");

1665

errno = old_errno;

1666

}

1667

return false;

1668

}

1669

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

1670

old_errno = errno;

1671

perror_plus("close");

1672

errno = old_errno;

1673

}

1674

return true;

1675

}

1676

1677

__attribute__((nonnull, warn_unused_result))

1678

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

1679

1680

/* Reject the loopback device */

1681

if(ifr->ifr_flags & IFF_LOOPBACK){

1682

if(debug){

1683

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

1684

ifname);

1685

}

1686

return false;

1687

}

1688

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

1689

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

1690

if(debug){

1691

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

1692

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

1693

}

1694

return true;

1695

}

1696

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

1697

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

1698

if(debug){

1699

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1700

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

1701

}

1702

return false;

1703

}

1704

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

1705

if(ifr->ifr_flags & IFF_NOARP){

1706

if(debug){

1707

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

1708

ifname);

1709

}

1710

return false;

1711

}

1712

1713

/* Accept this device */

1714

if(debug){

1715

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

1716

}

1717

return true;

1718

}

1719

1088

1720

/*

1089

1721

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

1090

1722

* corresponds to an acceptable network device.

1091

1723

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

1092

1724

*/

1725

__attribute__((nonnull, warn_unused_result))

1093

1726

int good_interface(const struct dirent *if_entry){

1094

ssize_t ssret;

1095

char *flagname = NULL;

1096

1727

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

1097

1728

return 0;

1098

1729

}

1099

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

1100

if_entry->d_name);

1101

if(ret < 0){

1102

perror_plus("asprintf");

1103

return 0;

1104

}

1105

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

1106

if(flags_fd == -1){

1107

perror_plus("open");

1108

free(flagname);

1109

return 0;

1110

}

1111

free(flagname);

1112

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

1113

/* read line from flags_fd */

1114

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

1115

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

1116

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

1117

if(flagstring == NULL){

1118

perror_plus("malloc");

1119

close(flags_fd);

1120

return 0;

1121

}

1122

while(to_read > 0){

1123

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

1124

(size_t)to_read));

1125

if(ssret == -1){

1126

perror_plus("read");

1127

free(flagstring);

1128

close(flags_fd);

1129

return 0;

1130

}

1131

to_read -= ssret;

1132

if(ssret == 0){

1133

break;

1134

}

1135

}

1136

close(flags_fd);

1137

intmax_t tmpmax;

1138

char *tmp;

1139

errno = 0;

1140

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

1141

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

1142

and not (isspace(*tmp)))

1143

or tmpmax != (ifreq_flags)tmpmax){

1144

if(debug){

1145

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

1146

flagstring, if_entry->d_name);

1147

}

1148

free(flagstring);

1149

return 0;

1150

}

1151

free(flagstring);

1152

ifreq_flags flags = (ifreq_flags)tmpmax;

1153

/* Reject the loopback device */

1154

if(flags & IFF_LOOPBACK){

1155

if(debug){

1156

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

1157

if_entry->d_name);

1158

}

1159

return 0;

1160

}

1161

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

1162

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

1163

if(debug){

1164

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

1165

if_entry->d_name);

1166

}

1167

return 1;

1168

}

1169

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

1170

if(not (flags & IFF_BROADCAST)){

1171

if(debug){

1172

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

1173

if_entry->d_name);

1174

}

1175

return 0;

1176

}

1177

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

1178

if(flags & IFF_NOARP){

1179

if(debug){

1180

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

1181

if_entry->d_name);

1182

}

1183

return 0;

1184

}

1185

/* Accept this device */

1186

if(debug){

1187

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

1188

if_entry->d_name);

1730

1731

struct ifreq ifr;

1732

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

1733

if(debug){

1734

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

1735

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

1736

}

1737

return 0;

1738

}

1739

1740

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

1741

return 0;

1189

1742

}

1190

1743

return 1;

1191

1744

}

1192

1745

1746

/*

1747

* This function determines if a network interface is up.

1748

*/

1749

__attribute__((nonnull, warn_unused_result))

1750

bool interface_is_up(const char *interface){

1751

struct ifreq ifr;

1752

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

1753

if(debug){

1754

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

1755

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

1756

}

1757

return false;

1758

}

1759

1760

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

1761

}

1762

1763

/*

1764

* This function determines if a network interface is running

1765

*/

1766

__attribute__((nonnull, warn_unused_result))

1767

bool interface_is_running(const char *interface){

1768

struct ifreq ifr;

1769

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

1770

if(debug){

1771

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

1772

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

1773

}

1774

return false;

1775

}

1776

1777

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

1778

}

1779

1780

__attribute__((nonnull, pure, warn_unused_result))

1193

1781

int notdotentries(const struct dirent *direntry){

1194

1782

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

1195

1783

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

1201

1789

return 1;

1202

1790

}

1203

1791

1204

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1792

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

1793

__attribute__((nonnull, warn_unused_result))

1794

int runnable_hook(const struct dirent *direntry){

1795

int ret;

1796

size_t sret;

1797

struct stat st;

1798

1799

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

1800

/* Empty name? */

1801

return 0;

1802

}

1803

1804

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

1805

"abcdefghijklmnopqrstuvwxyz"

1806

"0123456789"

1807

"_.-");

1808

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

1809

/* Contains non-allowed characters */

1810

if(debug){

1811

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

1812

direntry->d_name);

1813

}

1814

return 0;

1815

}

1816

1817

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

1818

if(ret == -1){

1819

if(debug){

1820

perror_plus("Could not stat hook");

1821

}

1822

return 0;

1823

}

1824

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

1825

/* Not a regular file */

1826

if(debug){

1827

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

1828

direntry->d_name);

1829

}

1830

return 0;

1831

}

1832

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

1833

/* Not executable */

1834

if(debug){

1835

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

1836

direntry->d_name);

1837

}

1838

return 0;

1839

}

1840

if(debug){

1841

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

1842

direntry->d_name);

1843

}

1844

return 1;

1845

}

1846

1847

__attribute__((nonnull, warn_unused_result))

1848

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1849

mandos_context *mc){

1205

1850

int ret;

1206

1851

struct timespec now;

1207

1852

struct timespec waited_time;

1208

1853

intmax_t block_time;

1209

1854

1210

1855

while(true){

1211

if(mc.current_server == NULL){

1212

if (debug){

1213

fprintf(stderr,

1214

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

1856

if(mc->current_server == NULL){

1857

if(debug){

1858

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

1859

" No timeout!\n");

1215

1860

}

1216

1861

ret = avahi_simple_poll_iterate(s, -1);

1217

1862

} else {

1218

if (debug){

1219

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

1220

" or wait\n");

1863

if(debug){

1864

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

1865

" it, or wait\n");

1221

1866

}

1222

1867

/* the current time */

1223

1868

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1228

1873

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

1229

1874

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

1230

1875

waited_time.tv_sec = (now.tv_sec

1231

- mc.current_server->last_seen.tv_sec);

1876

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

1232

1877

waited_time.tv_nsec = (now.tv_nsec

1233

- mc.current_server->last_seen.tv_nsec);

1878

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

1234

1879

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

1235

1880

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

1236

1881

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

1238

1883

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

1239

1884

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

1240

1885

1241

if (debug){

1242

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

1886

if(debug){

1887

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

1888

block_time);

1243

1889

}

1244

1890

1245

1891

if(block_time <= 0){

1246

ret = start_mandos_communication(mc.current_server->ip,

1247

mc.current_server->port,

1248

mc.current_server->if_index,

1249

mc.current_server->af);

1892

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

1893

mc->current_server->port,

1894

mc->current_server->if_index,

1895

mc->current_server->af, mc);

1250

1896

if(ret == 0){

1251

avahi_simple_poll_quit(mc.simple_poll);

1897

avahi_simple_poll_quit(s);

1252

1898

return 0;

1253

1899

}

1254

1900

ret = clock_gettime(CLOCK_MONOTONIC,

1255

&mc.current_server->last_seen);

1901

&mc->current_server->last_seen);

1256

1902

if(ret == -1){

1257

1903

perror_plus("clock_gettime");

1258

1904

return -1;

1259

1905

}

1260

mc.current_server = mc.current_server->next;

1906

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

1261

1907

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

1262

1908

servers, but don't block */

1263

1909

}

1265

1911

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

1266

1912

}

1267

1913

if(ret != 0){

1268

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

1914

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

1269

1915

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

1270

1916

}

1271

1917

}

1272

1918

}

1273

1919

}

1274

1920

1921

__attribute__((nonnull))

1922

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

1923

const float delay){

1924

struct dirent **direntries = NULL;

1925

if(hookdir_fd == -1){

1926

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1927

| O_CLOEXEC);

1928

if(hookdir_fd == -1){

1929

if(errno == ENOENT){

1930

if(debug){

1931

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

1932

" found\n", hookdir);

1933

}

1934

} else {

1935

perror_plus("open");

1936

}

1937

return;

1938

}

1939

}

1940

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

1941

if(devnull == -1){

1942

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

1943

return;

1944

}

1945

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

1946

runnable_hook, alphasort);

1947

if(numhooks == -1){

1948

perror_plus("scandir");

1949

close(devnull);

1950

return;

1951

}

1952

struct dirent *direntry;

1953

int ret;

1954

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

1955

direntry = direntries[i];

1956

if(debug){

1957

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

1958

direntry->d_name);

1959

}

1960

pid_t hook_pid = fork();

1961

if(hook_pid == 0){

1962

/* Child */

1963

/* Raise privileges */

1964

errno = raise_privileges_permanently();

1965

if(errno != 0){

1966

perror_plus("Failed to raise privileges");

1967

_exit(EX_NOPERM);

1968

}

1969

/* Set group */

1970

errno = 0;

1971

ret = setgid(0);

1972

if(ret == -1){

1973

perror_plus("setgid");

1974

_exit(EX_NOPERM);

1975

}

1976

/* Reset supplementary groups */

1977

errno = 0;

1978

ret = setgroups(0, NULL);

1979

if(ret == -1){

1980

perror_plus("setgroups");

1981

_exit(EX_NOPERM);

1982

}

1983

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

1984

if(ret == -1){

1985

perror_plus("setenv");

1986

_exit(EX_OSERR);

1987

}

1988

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

1989

if(ret == -1){

1990

perror_plus("setenv");

1991

_exit(EX_OSERR);

1992

}

1993

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

1994

if(ret == -1){

1995

perror_plus("setenv");

1996

_exit(EX_OSERR);

1997

}

1998

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

1999

if(ret == -1){

2000

perror_plus("setenv");

2001

_exit(EX_OSERR);

2002

}

2003

char *delaystring;

2004

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

2005

if(ret == -1){

2006

perror_plus("asprintf");

2007

_exit(EX_OSERR);

2008

}

2009

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

2010

if(ret == -1){

2011

free(delaystring);

2012

perror_plus("setenv");

2013

_exit(EX_OSERR);

2014

}

2015

free(delaystring);

2016

if(connect_to != NULL){

2017

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

2018

if(ret == -1){

2019

perror_plus("setenv");

2020

_exit(EX_OSERR);

2021

}

2022

}

2023

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

2024

direntry->d_name,

2025

O_RDONLY));

2026

if(hook_fd == -1){

2027

perror_plus("openat");

2028

_exit(EXIT_FAILURE);

2029

}

2030

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

2031

perror_plus("close");

2032

_exit(EXIT_FAILURE);

2033

}

2034

ret = dup2(devnull, STDIN_FILENO);

2035

if(ret == -1){

2036

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

2037

_exit(EX_OSERR);

2038

}

2039

ret = close(devnull);

2040

if(ret == -1){

2041

perror_plus("close");

2042

_exit(EX_OSERR);

2043

}

2044

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2045

if(ret == -1){

2046

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

2047

_exit(EX_OSERR);

2048

}

2049

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

2050

environ) == -1){

2051

perror_plus("fexecve");

2052

_exit(EXIT_FAILURE);

2053

}

2054

} else {

2055

if(hook_pid == -1){

2056

perror_plus("fork");

2057

free(direntry);

2058

continue;

2059

}

2060

int status;

2061

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

2062

perror_plus("waitpid");

2063

free(direntry);

2064

continue;

2065

}

2066

if(WIFEXITED(status)){

2067

if(WEXITSTATUS(status) != 0){

2068

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

2069

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

2070

WEXITSTATUS(status));

2071

free(direntry);

2072

continue;

2073

}

2074

} else if(WIFSIGNALED(status)){

2075

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

2076

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

2077

WTERMSIG(status));

2078

free(direntry);

2079

continue;

2080

} else {

2081

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

2082

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

2083

free(direntry);

2084

continue;

2085

}

2086

}

2087

if(debug){

2088

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

2089

direntry->d_name);

2090

}

2091

free(direntry);

2092

}

2093

free(direntries);

2094

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

2095

perror_plus("close");

2096

} else {

2097

hookdir_fd = -1;

2098

}

2099

close(devnull);

2100

}

2101

2102

__attribute__((nonnull, warn_unused_result))

2103

int bring_up_interface(const char *const interface,

2104

const float delay){

2105

int old_errno = errno;

2106

int ret;

2107

struct ifreq network;

2108

unsigned int if_index = if_nametoindex(interface);

2109

if(if_index == 0){

2110

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

2111

errno = old_errno;

2112

return ENXIO;

2113

}

2114

2115

if(quit_now){

2116

errno = old_errno;

2117

return EINTR;

2118

}

2119

2120

if(not interface_is_up(interface)){

2121

int ret_errno = 0;

2122

int ioctl_errno = 0;

2123

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

2124

ret_errno = errno;

2125

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

2126

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

2127

errno = old_errno;

2128

return ret_errno;

2129

}

2130

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

2131

2132

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

2133

if(sd == -1){

2134

ret_errno = errno;

2135

perror_plus("socket");

2136

errno = old_errno;

2137

return ret_errno;

2138

}

2139

2140

if(quit_now){

2141

ret = close(sd);

2142

if(ret == -1){

2143

perror_plus("close");

2144

}

2145

errno = old_errno;

2146

return EINTR;

2147

}

2148

2149

if(debug){

2150

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

2151

interface);

2152

}

2153

2154

/* Raise privileges */

2155

ret_errno = raise_privileges();

2156

if(ret_errno != 0){

2157

errno = ret_errno;

2158

perror_plus("Failed to raise privileges");

2159

}

2160

2161

#ifdef __linux__

2162

int ret_linux;

2163

bool restore_loglevel = false;

2164

if(ret_errno == 0){

2165

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2166

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

2167

ret_linux = klogctl(8, NULL, 5);

2168

if(ret_linux == -1){

2169

perror_plus("klogctl");

2170

} else {

2171

restore_loglevel = true;

2172

}

2173

}

2174

#endif /* __linux__ */

2175

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

2176

ioctl_errno = errno;

2177

#ifdef __linux__

2178

if(restore_loglevel){

2179

ret_linux = klogctl(7, NULL, 0);

2180

if(ret_linux == -1){

2181

perror_plus("klogctl");

2182

}

2183

}

2184

#endif /* __linux__ */

2185

2186

/* If raise_privileges() succeeded above */

2187

if(ret_errno == 0){

2188

/* Lower privileges */

2189

ret_errno = lower_privileges();

2190

if(ret_errno != 0){

2191

errno = ret_errno;

2192

perror_plus("Failed to lower privileges");

2193

}

2194

}

2195

2196

/* Close the socket */

2197

ret = close(sd);

2198

if(ret == -1){

2199

perror_plus("close");

2200

}

2201

2202

if(ret_setflags == -1){

2203

errno = ioctl_errno;

2204

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2205

errno = old_errno;

2206

return ioctl_errno;

2207

}

2208

} else if(debug){

2209

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

2210

interface);

2211

}

2212

2213

/* Sleep checking until interface is running.

2214

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

2215

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

2216

if(interface_is_running(interface)){

2217

break;

2218

}

2219

struct timespec sleeptime = { .tv_nsec = 250000000 };

2220

ret = nanosleep(&sleeptime, NULL);

2221

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

2222

perror_plus("nanosleep");

2223

}

2224

}

2225

2226

errno = old_errno;

2227

return 0;

2228

}

2229

2230

__attribute__((nonnull, warn_unused_result))

2231

int take_down_interface(const char *const interface){

2232

int old_errno = errno;

2233

struct ifreq network;

2234

unsigned int if_index = if_nametoindex(interface);

2235

if(if_index == 0){

2236

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

2237

errno = old_errno;

2238

return ENXIO;

2239

}

2240

if(interface_is_up(interface)){

2241

int ret_errno = 0;

2242

int ioctl_errno = 0;

2243

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

2244

ret_errno = errno;

2245

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

2246

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

2247

errno = old_errno;

2248

return ret_errno;

2249

}

2250

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

2251

2252

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

2253

if(sd == -1){

2254

ret_errno = errno;

2255

perror_plus("socket");

2256

errno = old_errno;

2257

return ret_errno;

2258

}

2259

2260

if(debug){

2261

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

2262

interface);

2263

}

2264

2265

/* Raise privileges */

2266

ret_errno = raise_privileges();

2267

if(ret_errno != 0){

2268

errno = ret_errno;

2269

perror_plus("Failed to raise privileges");

2270

}

2271

2272

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

2273

ioctl_errno = errno;

2274

2275

/* If raise_privileges() succeeded above */

2276

if(ret_errno == 0){

2277

/* Lower privileges */

2278

ret_errno = lower_privileges();

2279

if(ret_errno != 0){

2280

errno = ret_errno;

2281

perror_plus("Failed to lower privileges");

2282

}

2283

}

2284

2285

/* Close the socket */

2286

int ret = close(sd);

2287

if(ret == -1){

2288

perror_plus("close");

2289

}

2290

2291

if(ret_setflags == -1){

2292

errno = ioctl_errno;

2293

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2294

errno = old_errno;

2295

return ioctl_errno;

2296

}

2297

} else if(debug){

2298

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

2299

interface);

2300

}

2301

2302

errno = old_errno;

2303

return 0;

2304

}

2305

1275

2306

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

2307

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

2308

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

2309

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

2310

.current_server = NULL, .interfaces = NULL,

2311

.interfaces_size = 0 };

1276

2312

AvahiSServiceBrowser *sb = NULL;

1277

int error;

2313

error_t ret_errno;

1278

2314

int ret;

1279

2315

intmax_t tmpmax;

1280

2316

char *tmp;

1281

2317

int exitcode = EXIT_SUCCESS;

1282

const char *interface = "";

1283

struct ifreq network;

1284

int sd = -1;

1285

bool take_down_interface = false;

1286

uid_t uid;

1287

gid_t gid;

1288

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

1289

bool tempdir_created = false;

2318

char *interfaces_to_take_down = NULL;

2319

size_t interfaces_to_take_down_size = 0;

2320

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

2321

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

2322

char *tempdir = NULL;

1290

2323

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1291

2324

const char *seckey = PATHDIR "/" SECKEY;

1292

2325

const char *pubkey = PATHDIR "/" PUBKEY;

2326

const char *dh_params_file = NULL;

2327

char *interfaces_hooks = NULL;

1293

2328

1294

2329

bool gnutls_initialized = false;

1295

2330

bool gpgme_initialized = false;

1347

2382

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

1348

2383

" Diffie-Hellman key exchange",

1349

2384

.group = 2 },

2385

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

2386

.arg = "FILE",

2387

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

2388

" for the Diffie-Hellman key exchange",

2389

.group = 2 },

1350

2390

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

1351

2391

.arg = "STRING",

1352

2392

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

1357

2397

.group = 2 },

1358

2398

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

1359

2399

.arg = "SECONDS",

1360

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

2400

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

2401

.group = 2 },

2402

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

2403

.arg = "DIR",

2404

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

1361

2405

.group = 2 },

1362

2406

/*

1363

2407

* These reproduce what we would get without ARGP_NO_HELP

1382

2426

connect_to = arg;

1383

2427

break;

1384

2428

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

1385

interface = arg;

2429

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

2430

arg, (int)',');

2431

if(ret_errno != 0){

2432

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

2433

}

1386

2434

break;

1387

2435

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

1388

2436

seckey = arg;

1399

2447

}

1400

2448

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

1401

2449

break;

2450

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

2451

dh_params_file = arg;

2452

break;

1402

2453

case 130: /* --priority */

1403

2454

mc.priority = arg;

1404

2455

break;

1417

2468

argp_error(state, "Bad retry interval");

1418

2469

}

1419

2470

break;

2471

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

2472

hookdir = arg;

2473

break;

1420

2474

/*

1421

2475

* These reproduce what we would get without ARGP_NO_HELP

1422

2476

*/

1428

2482

argp_state_help(state, state->out_stream,

1429

2483

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1430

2484

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

1431

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

2485

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

1432

2486

exit(argp_err_exit_status);

1433

2487

break;

1434

2488

default:

1441

2495

.args_doc = "",

1442

2496

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

1443

2497

" passwords from a Mandos server" };

1444

ret = argp_parse(&argp, argc, argv,

1445

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1446

switch(ret){

2498

ret_errno = argp_parse(&argp, argc, argv,

2499

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2500

switch(ret_errno){

1447

2501

case 0:

1448

2502

break;

1449

2503

case ENOMEM:

1450

2504

default:

1451

errno = ret;

2505

errno = ret_errno;

1452

2506

perror_plus("argp_parse");

1453

2507

exitcode = EX_OSERR;

1454

2508

goto end;

1457

2511

goto end;

1458

2512

}

1459

2513

}

1460

2514

1461

2515

{

1462

2516

/* Work around Debian bug #633582:

1463

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

1464

struct stat st;

1465

1466

/* Re-raise priviliges */

1467

errno = 0;

1468

ret = seteuid(0);

1469

if(ret == -1){

1470

perror_plus("seteuid");

1471

}

1472

1473

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

1474

int seckey_fd = open(seckey, O_RDONLY);

1475

if(seckey_fd == -1){

1476

perror_plus("open");

1477

} else {

1478

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

1479

if(ret == -1){

1480

perror_plus("fstat");

1481

} else {

1482

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

1483

ret = fchown(seckey_fd, uid, gid);

1484

if(ret == -1){

1485

perror_plus("fchown");

1486

}

1487

}

1488

}

1489

TEMP_FAILURE_RETRY(close(seckey_fd));

1490

}

1491

}

1492

1493

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

1494

int pubkey_fd = open(pubkey, O_RDONLY);

1495

if(pubkey_fd == -1){

1496

perror_plus("open");

1497

} else {

1498

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

1499

if(ret == -1){

1500

perror_plus("fstat");

1501

} else {

1502

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

1503

ret = fchown(pubkey_fd, uid, gid);

1504

if(ret == -1){

1505

perror_plus("fchown");

1506

}

1507

}

1508

}

1509

TEMP_FAILURE_RETRY(close(pubkey_fd));

1510

}

1511

}

1512

1513

/* Lower privileges */

1514

errno = 0;

1515

ret = seteuid(uid);

1516

if(ret == -1){

1517

perror_plus("seteuid");

1518

}

2517

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

2518

2519

/* Re-raise privileges */

2520

ret = raise_privileges();

2521

if(ret != 0){

2522

errno = ret;

2523

perror_plus("Failed to raise privileges");

2524

} else {

2525

struct stat st;

2526

2527

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

2528

int seckey_fd = open(seckey, O_RDONLY);

2529

if(seckey_fd == -1){

2530

perror_plus("open");

2531

} else {

2532

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

2533

if(ret == -1){

2534

perror_plus("fstat");

2535

} else {

2536

if(S_ISREG(st.st_mode)

2537

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

2538

ret = fchown(seckey_fd, uid, gid);

2539

if(ret == -1){

2540

perror_plus("fchown");

2541

}

2542

}

2543

}

2544

close(seckey_fd);

2545

}

2546

}

2547

2548

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

2549

int pubkey_fd = open(pubkey, O_RDONLY);

2550

if(pubkey_fd == -1){

2551

perror_plus("open");

2552

} else {

2553

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

2554

if(ret == -1){

2555

perror_plus("fstat");

2556

} else {

2557

if(S_ISREG(st.st_mode)

2558

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

2559

ret = fchown(pubkey_fd, uid, gid);

2560

if(ret == -1){

2561

perror_plus("fchown");

2562

}

2563

}

2564

}

2565

close(pubkey_fd);

2566

}

2567

}

2568

2569

if(dh_params_file != NULL

2570

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

2571

int dhparams_fd = open(dh_params_file, O_RDONLY);

2572

if(dhparams_fd == -1){

2573

perror_plus("open");

2574

} else {

2575

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

2576

if(ret == -1){

2577

perror_plus("fstat");

2578

} else {

2579

if(S_ISREG(st.st_mode)

2580

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

2581

ret = fchown(dhparams_fd, uid, gid);

2582

if(ret == -1){

2583

perror_plus("fchown");

2584

}

2585

}

2586

}

2587

close(dhparams_fd);

2588

}

2589

}

2590

2591

/* Lower privileges */

2592

ret = lower_privileges();

2593

if(ret != 0){

2594

errno = ret;

2595

perror_plus("Failed to lower privileges");

2596

}

2597

}

2598

}

2599

2600

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

2601

{

2602

char *interface = NULL;

2603

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

2604

interface))){

2605

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

2606

and if_nametoindex(interface) == 0){

2607

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

2608

fprintf_plus(stderr, "Not using nonexisting interface"

2609

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

2610

}

2611

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

2612

interface = NULL;

2613

}

2614

}

2615

}

2616

2617

/* Run network hooks */

2618

{

2619

if(mc.interfaces != NULL){

2620

interfaces_hooks = malloc(mc.interfaces_size);

2621

if(interfaces_hooks == NULL){

2622

perror_plus("malloc");

2623

goto end;

2624

}

2625

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

2626

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

2627

}

2628

run_network_hooks("start", interfaces_hooks != NULL ?

2629

interfaces_hooks : "", delay);

1519

2630

}

1520

2631

1521

2632

if(not debug){

1522

2633

avahi_set_log_function(empty_log);

1523

2634

}

1524

1525

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

1526

struct dirent **direntries;

1527

ret = scandir(sys_class_net, &direntries, good_interface,

1528

alphasort);

1529

if(ret >= 1){

1530

/* Pick the first good interface */

1531

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

1532

if(debug){

1533

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

1534

}

1535

if(interface == NULL){

1536

perror_plus("malloc");

1537

free(direntries);

1538

exitcode = EXIT_FAILURE;

1539

goto end;

1540

}

1541

free(direntries);

1542

} else {

1543

free(direntries);

1544

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

1545

exitcode = EXIT_FAILURE;

1546

goto end;

1547

}

1548

}

1549

2635

1550

2636

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

1551

2637

from the signal handler */

1552

2638

/* Initialize the pseudo-RNG for Avahi */

1553

2639

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

1554

mc.simple_poll = avahi_simple_poll_new();

1555

if(mc.simple_poll == NULL){

1556

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

2640

simple_poll = avahi_simple_poll_new();

2641

if(simple_poll == NULL){

2642

fprintf_plus(stderr,

2643

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

1557

2644

exitcode = EX_UNAVAILABLE;

1558

2645

goto end;

1559

2646

}

1621

2708

}

1622

2709

}

1623

2710

1624

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

1625

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

1626

if_index = (AvahiIfIndex) if_nametoindex(interface);

1627

if(if_index == 0){

1628

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

1629

exitcode = EX_UNAVAILABLE;

1630

goto end;

1631

}

1632

1633

if(quit_now){

1634

goto end;

1635

}

1636

1637

/* Re-raise priviliges */

1638

errno = 0;

1639

ret = seteuid(0);

1640

if(ret == -1){

1641

perror_plus("seteuid");

1642

}

1643

1644

#ifdef __linux__

1645

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1646

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

1647

ret = klogctl(8, NULL, 5);

1648

bool restore_loglevel = true;

1649

if(ret == -1){

1650

restore_loglevel = false;

1651

perror_plus("klogctl");

1652

}

1653

#endif /* __linux__ */

1654

1655

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1656

if(sd < 0){

1657

perror_plus("socket");

1658

exitcode = EX_OSERR;

1659

#ifdef __linux__

1660

if(restore_loglevel){

1661

ret = klogctl(7, NULL, 0);

1662

if(ret == -1){

1663

perror_plus("klogctl");

1664

}

1665

}

1666

#endif /* __linux__ */

1667

/* Lower privileges */

1668

errno = 0;

1669

ret = seteuid(uid);

1670

if(ret == -1){

1671

perror_plus("seteuid");

1672

}

1673

goto end;

1674

}

1675

strcpy(network.ifr_name, interface);

1676

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

1677

if(ret == -1){

1678

perror_plus("ioctl SIOCGIFFLAGS");

1679

#ifdef __linux__

1680

if(restore_loglevel){

1681

ret = klogctl(7, NULL, 0);

1682

if(ret == -1){

1683

perror_plus("klogctl");

1684

}

1685

}

1686

#endif /* __linux__ */

1687

exitcode = EX_OSERR;

1688

/* Lower privileges */

1689

errno = 0;

1690

ret = seteuid(uid);

1691

if(ret == -1){

1692

perror_plus("seteuid");

1693

}

1694

goto end;

1695

}

1696

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

1697

network.ifr_flags |= IFF_UP;

1698

take_down_interface = true;

1699

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

1700

if(ret == -1){

1701

take_down_interface = false;

1702

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1703

exitcode = EX_OSERR;

1704

#ifdef __linux__

1705

if(restore_loglevel){

1706

ret = klogctl(7, NULL, 0);

1707

if(ret == -1){

1708

perror_plus("klogctl");

2711

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

2712

if(mc.interfaces == NULL){

2713

struct dirent **direntries = NULL;

2714

/* Look for any good interfaces */

2715

ret = scandir(sys_class_net, &direntries, good_interface,

2716

alphasort);

2717

if(ret >= 1){

2718

/* Add all found interfaces to interfaces list */

2719

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

2720

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

2721

direntries[i]->d_name);

2722

if(ret_errno != 0){

2723

errno = ret_errno;

2724

perror_plus("argz_add");

2725

free(direntries[i]);

2726

continue;

2727

}

2728

if(debug){

2729

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

2730

direntries[i]->d_name);

2731

}

2732

free(direntries[i]);

2733

}

2734

free(direntries);

2735

} else {

2736

if(ret == 0){

2737

free(direntries);

2738

}

2739

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

2740

exitcode = EXIT_FAILURE;

2741

goto end;

2742

}

2743

}

2744

2745

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

2746

{

2747

char *interface = NULL;

2748

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

2749

interface))){

2750

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

2751

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

2752

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

2753

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

2754

interface);

2755

interface = NULL;

2756

while((interface = argz_next(mc.interfaces,

2757

mc.interfaces_size, interface))){

2758

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

2759

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

2760

interface);

2761

interface = NULL;

1709

2762

}

1710

2763

}

1711

#endif /* __linux__ */

1712

/* Lower privileges */

1713

errno = 0;

1714

ret = seteuid(uid);

1715

if(ret == -1){

1716

perror_plus("seteuid");

1717

}

1718

goto end;

1719

}

1720

}

1721

/* Sleep checking until interface is running.

1722

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

1723

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

1724

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

1725

if(ret == -1){

1726

perror_plus("ioctl SIOCGIFFLAGS");

1727

} else if(network.ifr_flags & IFF_RUNNING){

1728

2764

break;

1729

2765

}

1730

struct timespec sleeptime = { .tv_nsec = 250000000 };

1731

ret = nanosleep(&sleeptime, NULL);

1732

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

1733

perror_plus("nanosleep");

1734

}

1735

}

1736

if(not take_down_interface){

1737

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

1738

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

1739

if(ret == -1){

1740

perror_plus("close");

1741

}

1742

}

1743

#ifdef __linux__

1744

if(restore_loglevel){

1745

/* Restores kernel loglevel to default */

1746

ret = klogctl(7, NULL, 0);

1747

if(ret == -1){

1748

perror_plus("klogctl");

1749

}

1750

}

1751

#endif /* __linux__ */

1752

/* Lower privileges */

1753

errno = 0;

1754

if(take_down_interface){

1755

/* Lower privileges */

1756

ret = seteuid(uid);

1757

if(ret == -1){

1758

perror_plus("seteuid");

1759

}

1760

} else {

1761

/* Lower privileges permanently */

1762

ret = setuid(uid);

1763

if(ret == -1){

1764

perror_plus("setuid");

1765

}

1766

}

2766

bool interface_was_up = interface_is_up(interface);

2767

errno = bring_up_interface(interface, delay);

2768

if(not interface_was_up){

2769

if(errno != 0){

2770

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

2771

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

2772

} else {

2773

errno = argz_add(&interfaces_to_take_down,

2774

&interfaces_to_take_down_size,

2775

interface);

2776

if(errno != 0){

2777

perror_plus("argz_add");

2778

}

2779

}

2780

}

2781

}

2782

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

2783

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

2784

}

2785

}

2786

2787

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

2788

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

2789

if(debug){

2790

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

2791

mc.interfaces);

2792

}

2793

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

1767

2794

}

1768

2795

1769

2796

if(quit_now){

1770

2797

goto end;

1771

2798

}

1772

2799

1773

ret = init_gnutls_global(pubkey, seckey);

2800

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

1774

2801

if(ret == -1){

1775

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

2802

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

1776

2803

exitcode = EX_UNAVAILABLE;

1777

2804

goto end;

1778

2805

} else {

1783

2810

goto end;

1784

2811

}

1785

2812

1786

if(mkdtemp(tempdir) == NULL){

2813

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

2814

tempdir = mkdtemp(run_tempdir);

2815

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

2816

if(debug){

2817

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

2818

run_tempdir, old_tempdir);

2819

}

2820

tempdir = mkdtemp(old_tempdir);

2821

}

2822

if(tempdir == NULL){

1787

2823

perror_plus("mkdtemp");

1788

2824

goto end;

1789

2825

}

1790

tempdir_created = true;

1791

2826

1792

2827

if(quit_now){

1793

2828

goto end;

1794

2829

}

1795

2830

1796

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

1797

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

2831

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

2832

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

1798

2833

exitcode = EX_UNAVAILABLE;

1799

2834

goto end;

1800

2835

} else {

1809

2844

/* Connect directly, do not use Zeroconf */

1810

2845

/* (Mainly meant for debugging) */

1811

2846

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

2847

1812

2848

if(address == NULL){

1813

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

2849

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

1814

2850

exitcode = EX_USAGE;

1815

2851

goto end;

1816

2852

}

1819

2855

goto end;

1820

2856

}

1821

2857

1822

uint16_t port;

2858

in_port_t port;

1823

2859

errno = 0;

1824

2860

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

1825

2861

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

1826

or tmpmax != (uint16_t)tmpmax){

1827

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

2862

or tmpmax != (in_port_t)tmpmax){

2863

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

1828

2864

exitcode = EX_USAGE;

1829

2865

goto end;

1830

2866

}

1831

2867

1832

2868

if(quit_now){

1833

2869

goto end;

1834

2870

}

1835

2871

1836

port = (uint16_t)tmpmax;

2872

port = (in_port_t)tmpmax;

1837

2873

*address = '\0';

1838

2874

/* Colon in address indicates IPv6 */

1839

2875

int af;

1855

2891

}

1856

2892

1857

2893

while(not quit_now){

1858

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

2894

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

2895

&mc);

1859

2896

if(quit_now or ret == 0){

1860

2897

break;

1861

2898

}

1862

2899

if(debug){

1863

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

1864

(int)retry_interval);

2900

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

2901

(int)retry_interval);

1865

2902

}

1866

sleep((int)retry_interval);

2903

sleep((unsigned int)retry_interval);

1867

2904

}

1868

2905

1869

if (not quit_now){

2906

if(not quit_now){

1870

2907

exitcode = EXIT_SUCCESS;

1871

2908

}

1872

2909

1873

2910

goto end;

1874

2911

}

1875

2912

1887

2924

config.publish_domain = 0;

1888

2925

1889

2926

/* Allocate a new server */

1890

mc.server = avahi_server_new(avahi_simple_poll_get

1891

(mc.simple_poll), &config, NULL,

1892

NULL, &error);

2927

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2928

&config, NULL, NULL, &ret);

1893

2929

1894

2930

/* Free the Avahi configuration data */

1895

2931

avahi_server_config_free(&config);

1897

2933

1898

2934

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

1899

2935

if(mc.server == NULL){

1900

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

1901

avahi_strerror(error));

2936

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

2937

avahi_strerror(ret));

1902

2938

exitcode = EX_UNAVAILABLE;

1903

2939

goto end;

1904

2940

}

1910

2946

/* Create the Avahi service browser */

1911

2947

sb = avahi_s_service_browser_new(mc.server, if_index,

1912

2948

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1913

NULL, 0, browse_callback, NULL);

2949

NULL, 0, browse_callback,

2950

(void *)&mc);

1914

2951

if(sb == NULL){

1915

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

1916

avahi_strerror(avahi_server_errno(mc.server)));

2952

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

2953

avahi_strerror(avahi_server_errno(mc.server)));

1917

2954

exitcode = EX_UNAVAILABLE;

1918

2955

goto end;

1919

2956

}

1925

2962

/* Run the main loop */

1926

2963

1927

2964

if(debug){

1928

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

2965

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

1929

2966

}

1930

1931

ret = avahi_loop_with_timeout(mc.simple_poll,

1932

(int)(retry_interval * 1000));

2967

2968

ret = avahi_loop_with_timeout(simple_poll,

2969

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

1933

2970

if(debug){

1934

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

1935

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

2971

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

2972

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

1936

2973

}

1937

2974

1938

2975

end:

1939

2976

1940

2977

if(debug){

1941

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

2978

if(signal_received){

2979

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

2980

argv[0], signal_received,

2981

strsignal(signal_received));

2982

} else {

2983

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

2984

}

1942

2985

}

1943

2986

1944

2987

/* Cleanup things */

2988

free(mc.interfaces);

2989

1945

2990

if(sb != NULL)

1946

2991

avahi_s_service_browser_free(sb);

1947

2992

1948

2993

if(mc.server != NULL)

1949

2994

avahi_server_free(mc.server);

1950

2995

1951

if(mc.simple_poll != NULL)

1952

avahi_simple_poll_free(mc.simple_poll);

2996

if(simple_poll != NULL)

2997

avahi_simple_poll_free(simple_poll);

1953

2998

1954

2999

if(gnutls_initialized){

1955

3000

gnutls_certificate_free_credentials(mc.cred);

1956

gnutls_global_deinit();

1957

3001

gnutls_dh_params_deinit(mc.dh_params);

1958

3002

}

1959

3003

1960

3004

if(gpgme_initialized){

1961

3005

gpgme_release(mc.ctx);

1962

3006

}

1963

3007

1964

3008

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

1965

3009

has seen */

1966

3010

if(mc.current_server != NULL){

1967

3011

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

1968

3012

while(mc.current_server != NULL){

1969

3013

server *next = mc.current_server->next;

3014

#ifdef __GNUC__

3015

#pragma GCC diagnostic push

3016

#pragma GCC diagnostic ignored "-Wcast-qual"

3017

#endif

3018

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

3019

#ifdef __GNUC__

3020

#pragma GCC diagnostic pop

3021

#endif

1970

3022

free(mc.current_server);

1971

3023

mc.current_server = next;

1972

3024

}

1973

3025

}

1974

3026

1975

/* Take down the network interface */

1976

if(take_down_interface){

1977

/* Re-raise priviliges */

1978

errno = 0;

1979

ret = seteuid(0);

1980

if(ret == -1){

1981

perror_plus("seteuid");

1982

}

1983

if(geteuid() == 0){

1984

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

1985

if(ret == -1){

1986

perror_plus("ioctl SIOCGIFFLAGS");

1987

} else if(network.ifr_flags & IFF_UP) {

1988

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

1989

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

1990

if(ret == -1){

1991

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1992

}

1993

}

1994

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

1995

if(ret == -1){

1996

perror_plus("close");

1997

}

1998

/* Lower privileges permanently */

1999

errno = 0;

2000

ret = setuid(uid);

2001

if(ret == -1){

2002

perror_plus("setuid");

2003

}

2004

}

3027

/* Re-raise privileges */

3028

{

3029

ret = raise_privileges();

3030

if(ret != 0){

3031

errno = ret;

3032

perror_plus("Failed to raise privileges");

3033

} else {

3034

3035

/* Run network hooks */

3036

run_network_hooks("stop", interfaces_hooks != NULL ?

3037

interfaces_hooks : "", delay);

3038

3039

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

3040

{

3041

char *interface = NULL;

3042

while((interface = argz_next(interfaces_to_take_down,

3043

interfaces_to_take_down_size,

3044

interface))){

3045

ret = take_down_interface(interface);

3046

if(ret != 0){

3047

errno = ret;

3048

perror_plus("Failed to take down interface");

3049

}

3050

}

3051

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

3052

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

3053

" down\n");

3054

}

3055

}

3056

}

3057

3058

ret = lower_privileges_permanently();

3059

if(ret != 0){

3060

errno = ret;

3061

perror_plus("Failed to lower privileges permanently");

3062

}

3063

}

3064

3065

free(interfaces_to_take_down);

3066

free(interfaces_hooks);

3067

3068

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

3069

uintmax_t level){

3070

struct dirent **direntries = NULL;

3071

int dret;

3072

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

3073

O_RDONLY

3074

| O_NOFOLLOW

3075

| O_DIRECTORY

3076

| O_PATH));

3077

if(dir_fd == -1){

3078

perror_plus("open");

3079

return;

3080

}

3081

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

3082

notdotentries, alphasort);

3083

if(numentries >= 0){

3084

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

3085

if(debug){

3086

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

3087

dirname, direntries[i]->d_name);

3088

}

3089

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

3090

if(dret == -1){

3091

if(errno == EISDIR){

3092

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

3093

AT_REMOVEDIR);

3094

}

3095

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

3096

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

3097

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

3098

/* Recurse only in this special case */

3099

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

3100

dret = 0;

3101

}

3102

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

3103

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

3104

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

3105

}

3106

}

3107

free(direntries[i]);

3108

}

3109

3110

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

3111

free(direntries);

3112

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3113

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

3114

perror_plus("rmdir");

3115

}

3116

} else {

3117

perror_plus("scandirat");

3118

}

3119

close(dir_fd);

2005

3120

}

2006

3121

2007

3122

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

2008

if(tempdir_created){

2009

struct dirent **direntries = NULL;

2010

struct dirent *direntry = NULL;

2011

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

2012

alphasort);

2013

if (numentries > 0){

2014

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

2015

direntry = direntries[i];

2016

char *fullname = NULL;

2017

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

2018

direntry->d_name);

2019

if(ret < 0){

2020

perror_plus("asprintf");

2021

continue;

2022

}

2023

ret = remove(fullname);

2024

if(ret == -1){

2025

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

2026

strerror(errno));

2027

}

2028

free(fullname);

2029

}

2030

}

2031

2032

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

2033

free(direntries);

2034

if (numentries == -1){

2035

perror_plus("scandir");

2036

}

2037

ret = rmdir(tempdir);

2038

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

2039

perror_plus("rmdir");

2040

}

3123

if(tempdir != NULL){

3124

clean_dir_at(-1, tempdir, 0);

2041

3125

}

2042

3126

2043

3127

if(quit_now){