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237.25.6
(compared to revision 269.2.1)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2015-07-06 20:09:47 UTC
- mto: (237.7.307 trunk)
- mto: This revision was merged to the branch mainline in revision 325.
- Revision ID: teddy@recompile.se-20150706200947-w21u4eq74efgl6r5
Fix minor bugs and typos and add some more debug output.
* Makefile (install-client-nokey): Create plugin-helpers directory and
the mandos-client-iprouteadddel
helper program.
* initramfs-tools-hook (PLUGINHELPERDIR): Fix typo.
* plugins.d/mandos-client.c: Change terminology; routes are "deleted",
not "removed". All occurences changed.
(add_remove_local_route): Renamed to "add_delete_local_route". All
callers changed. Also pass "--debug" flag
to helper if in debug mode.
(add_local_route): Add debugging output.
(remove_local_route): Renamed to "delete_local_route". All callers
changed. Also pass "--debug" flag to helper
if in debug mode.
(start_mandos_communication): Add debug output when adding route.
* Makefile (install-client-nokey): Create plugin-helpers directory and
the mandos-client-iprouteadddel
helper program.
* initramfs-tools-hook (PLUGINHELPERDIR): Fix typo.
* plugins.d/mandos-client.c: Change terminology; routes are "deleted",
not "removed". All occurences changed.
(add_remove_local_route): Renamed to "add_delete_local_route". All
callers changed. Also pass "--debug" flag
to helper if in debug mode.
(add_local_route): Add debugging output.
(remove_local_route): Renamed to "delete_local_route". All callers
changed. Also pass "--debug" flag to helper
if in debug mode.
(start_mandos_communication): Add debug output when adding route.
- files added:
- DBUS-API
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
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* "browse_callback", and parts of "main".
10
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*
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* Everything else is
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* Copyright © 2008,2009 Teddy Hogeborn
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* Copyright © 2008,2009 Björn Påhlsson
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* Copyright © 2008-2015 Teddy Hogeborn
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* Copyright © 2008-2015 Björn Påhlsson
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*
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* This program is free software: you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* along with this program. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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* Contact the authors at <mandos@fukt.bsnet.se>.
29
* 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
35
#endif
35
#endif /* not _LARGEFILE_SOURCE */
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#ifndef _FILE_OFFSET_BITS
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#define _FILE_OFFSET_BITS 64
38
#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() */
44
#include <stdint.h> /* uint16_t, uint32_t */
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stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
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#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof(), abort() */
46
#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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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() */
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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 <time.h> /* nanosleep(), time() */
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#include <errno.h> /* perror(), errno,
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program_invocation_short_name */
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#include <time.h> /* nanosleep(), time(), sleep() */
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#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
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SIOCSIFFLAGS, if_indextoname(),
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if_nametoindex(), IF_NAMESIZE */
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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 */
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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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#include <signal.h> /* sigemptyset(), sigaddset(),
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sigaction(), SIGTERM, sig_atomic_t,
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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 */
121
/* 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;
127
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;
144
const char *hookdir = HOOKDIR;
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int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
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/* Doubly linked list that need to be circularly linked when used */
150
typedef struct server{
151
const char *ip;
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in_port_t port;
153
AvahiIfIndex if_index;
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int af;
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struct timespec last_seen;
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struct server *next;
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struct server *prev;
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} server;
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/* Used for passing in values through the Avahi callback functions */
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typedef struct {
131
AvahiSimplePoll *simple_poll;
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AvahiServer *server;
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gnutls_certificate_credentials_t cred;
134
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unsigned int dh_bits;
135
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gnutls_dh_params_t dh_params;
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const char *priority;
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gpgme_ctx_t ctx;
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
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} mandos_context;
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/* global context so signal handler can reach it*/
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
142
.dh_bits = 1024, .priority = "SECURE256"
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
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sig_atomic_t quit_now = 0;
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int signal_received = 0;
147
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/* Function to use when printing errors */
180
void perror_plus(const char *print_text){
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int e = errno;
182
fprintf(stderr, "Mandos plugin %s: ",
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program_invocation_short_name);
184
errno = e;
185
perror(print_text);
186
}
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__attribute__((format (gnu_printf, 2, 3), nonnull))
189
int fprintf_plus(FILE *stream, const char *format, ...){
190
va_list ap;
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va_start (ap, format);
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TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
196
}
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/*
149
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* Make additional room in "buffer" for at least BUFFER_SIZE more
150
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* bytes. "buffer_capacity" is how much is currently allocated,
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* "buffer_length" is how much is already used.
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*/
203
__attribute__((nonnull, warn_unused_result))
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size_t incbuffer(char **buffer, size_t buffer_length,
154
size_t buffer_capacity){
205
size_t buffer_capacity){
155
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if(buffer_length + BUFFER_SIZE > buffer_capacity){
156
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
157
if(buffer == NULL){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
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free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
158
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return 0;
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}
215
*buffer = new_buf;
160
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buffer_capacity += BUFFER_SIZE;
161
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}
162
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return buffer_capacity;
163
219
}
164
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/* Add server to set of servers to retry periodically */
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
225
int ret;
226
server *new_server = malloc(sizeof(server));
227
if(new_server == NULL){
228
perror_plus("malloc");
229
return false;
230
}
231
*new_server = (server){ .ip = strdup(ip),
232
.port = port,
233
.if_index = if_index,
234
.af = af };
235
if(new_server->ip == NULL){
236
perror_plus("strdup");
237
free(new_server);
238
return false;
239
}
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
if(ret == -1){
242
perror_plus("clock_gettime");
243
#ifdef __GNUC__
244
#pragma GCC diagnostic push
245
#pragma GCC diagnostic ignored "-Wcast-qual"
246
#endif
247
free((char *)(new_server->ip));
248
#ifdef __GNUC__
249
#pragma GCC diagnostic pop
250
#endif
251
free(new_server);
252
return false;
253
}
254
/* Special case of first server */
255
if(*current_server == NULL){
256
new_server->next = new_server;
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new_server->prev = new_server;
258
*current_server = new_server;
259
} else {
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
263
new_server->prev->next = new_server;
264
(*current_server)->prev = new_server;
265
}
266
return true;
267
}
268
165
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/*
166
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* Initialize GPGME.
167
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*/
168
static bool init_gpgme(const char *seckey,
169
const char *pubkey, const char *tempdir){
272
__attribute__((nonnull, warn_unused_result))
273
static bool init_gpgme(const char * const seckey,
274
const char * const pubkey,
275
const char * const tempdir,
276
mandos_context *mc){
170
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gpgme_error_t rc;
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gpgme_engine_info_t engine_info;
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/*
175
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* Helper function to insert pub and seckey to the engine keyring.
176
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*/
177
bool import_key(const char *filename){
283
bool import_key(const char * const filename){
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int ret;
179
285
int fd;
180
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gpgme_data_t pgp_data;
181
287
182
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fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
183
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if(fd == -1){
184
perror("open");
290
perror_plus("open");
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return false;
186
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}
187
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rc = gpgme_data_new_from_fd(&pgp_data, fd);
189
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if(rc != GPG_ERR_NO_ERROR){
190
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
191
gpgme_strsource(rc), gpgme_strerror(rc));
296
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
297
gpgme_strsource(rc), gpgme_strerror(rc));
192
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return false;
193
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}
194
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195
rc = gpgme_op_import(mc.ctx, pgp_data);
301
rc = gpgme_op_import(mc->ctx, pgp_data);
196
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if(rc != GPG_ERR_NO_ERROR){
197
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
198
gpgme_strsource(rc), gpgme_strerror(rc));
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
199
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return false;
200
306
}
201
307
202
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ret = (int)TEMP_FAILURE_RETRY(close(fd));
203
309
if(ret == -1){
204
perror("close");
310
perror_plus("close");
205
311
}
206
312
gpgme_data_release(pgp_data);
207
313
return true;
208
314
}
209
315
210
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if(debug){
211
fprintf(stderr, "Initializing GPGME\n");
317
fprintf_plus(stderr, "Initializing GPGME\n");
212
318
}
213
319
214
320
/* Init GPGME */
215
321
gpgme_check_version(NULL);
216
322
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
217
323
if(rc != GPG_ERR_NO_ERROR){
218
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
219
gpgme_strsource(rc), gpgme_strerror(rc));
324
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
325
gpgme_strsource(rc), gpgme_strerror(rc));
220
326
return false;
221
327
}
222
328
223
/* Set GPGME home directory for the OpenPGP engine only */
329
/* Set GPGME home directory for the OpenPGP engine only */
224
330
rc = gpgme_get_engine_info(&engine_info);
225
331
if(rc != GPG_ERR_NO_ERROR){
226
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
227
gpgme_strsource(rc), gpgme_strerror(rc));
332
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
333
gpgme_strsource(rc), gpgme_strerror(rc));
228
334
return false;
229
335
}
230
336
while(engine_info != NULL){
236
342
engine_info = engine_info->next;
237
343
}
238
344
if(engine_info == NULL){
239
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
345
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
346
tempdir);
240
347
return false;
241
348
}
242
349
243
350
/* Create new GPGME "context" */
244
rc = gpgme_new(&(mc.ctx));
351
rc = gpgme_new(&(mc->ctx));
245
352
if(rc != GPG_ERR_NO_ERROR){
246
fprintf(stderr, "bad gpgme_new: %s: %s\n",
247
gpgme_strsource(rc), gpgme_strerror(rc));
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
355
gpgme_strerror(rc));
248
356
return false;
249
357
}
250
358
259
367
* Decrypt OpenPGP data.
260
368
* Returns -1 on error
261
369
*/
370
__attribute__((nonnull, warn_unused_result))
262
371
static ssize_t pgp_packet_decrypt(const char *cryptotext,
263
372
size_t crypto_size,
264
char **plaintext){
373
char **plaintext,
374
mandos_context *mc){
265
375
gpgme_data_t dh_crypto, dh_plain;
266
376
gpgme_error_t rc;
267
377
ssize_t ret;
269
379
ssize_t plaintext_length = 0;
270
380
271
381
if(debug){
272
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
382
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
273
383
}
274
384
275
385
/* Create new GPGME data buffer from memory cryptotext */
276
386
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
277
387
0);
278
388
if(rc != GPG_ERR_NO_ERROR){
279
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
280
gpgme_strsource(rc), gpgme_strerror(rc));
389
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
390
gpgme_strsource(rc), gpgme_strerror(rc));
281
391
return -1;
282
392
}
283
393
284
394
/* Create new empty GPGME data buffer for the plaintext */
285
395
rc = gpgme_data_new(&dh_plain);
286
396
if(rc != GPG_ERR_NO_ERROR){
287
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
288
gpgme_strsource(rc), gpgme_strerror(rc));
397
fprintf_plus(stderr, "Mandos plugin mandos-client: "
398
"bad gpgme_data_new: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
289
400
gpgme_data_release(dh_crypto);
290
401
return -1;
291
402
}
292
403
293
404
/* Decrypt data from the cryptotext data buffer to the plaintext
294
405
data buffer */
295
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
296
407
if(rc != GPG_ERR_NO_ERROR){
297
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
298
gpgme_strsource(rc), gpgme_strerror(rc));
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
gpgme_strsource(rc), gpgme_strerror(rc));
299
410
plaintext_length = -1;
300
411
if(debug){
301
412
gpgme_decrypt_result_t result;
302
result = gpgme_op_decrypt_result(mc.ctx);
413
result = gpgme_op_decrypt_result(mc->ctx);
303
414
if(result == NULL){
304
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
305
416
} else {
306
fprintf(stderr, "Unsupported algorithm: %s\n",
307
result->unsupported_algorithm);
308
fprintf(stderr, "Wrong key usage: %u\n",
309
result->wrong_key_usage);
417
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
418
result->unsupported_algorithm);
419
fprintf_plus(stderr, "Wrong key usage: %u\n",
420
result->wrong_key_usage);
310
421
if(result->file_name != NULL){
311
fprintf(stderr, "File name: %s\n", result->file_name);
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
312
423
}
313
424
gpgme_recipient_t recipient;
314
425
recipient = result->recipients;
315
426
while(recipient != NULL){
316
fprintf(stderr, "Public key algorithm: %s\n",
317
gpgme_pubkey_algo_name(recipient->pubkey_algo));
318
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
319
fprintf(stderr, "Secret key available: %s\n",
320
recipient->status == GPG_ERR_NO_SECKEY
321
? "No" : "Yes");
427
fprintf_plus(stderr, "Public key algorithm: %s\n",
428
gpgme_pubkey_algo_name
429
(recipient->pubkey_algo));
430
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
431
fprintf_plus(stderr, "Secret key available: %s\n",
432
recipient->status == GPG_ERR_NO_SECKEY
433
? "No" : "Yes");
322
434
recipient = recipient->next;
323
435
}
324
436
}
327
439
}
328
440
329
441
if(debug){
330
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
442
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
331
443
}
332
444
333
445
/* Seek back to the beginning of the GPGME plaintext data buffer */
334
446
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
335
perror("gpgme_data_seek");
447
perror_plus("gpgme_data_seek");
336
448
plaintext_length = -1;
337
449
goto decrypt_end;
338
450
}
340
452
*plaintext = NULL;
341
453
while(true){
342
454
plaintext_capacity = incbuffer(plaintext,
343
(size_t)plaintext_length,
344
plaintext_capacity);
455
(size_t)plaintext_length,
456
plaintext_capacity);
345
457
if(plaintext_capacity == 0){
346
perror("incbuffer");
347
plaintext_length = -1;
348
goto decrypt_end;
458
perror_plus("incbuffer");
459
plaintext_length = -1;
460
goto decrypt_end;
349
461
}
350
462
351
463
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
356
468
break;
357
469
}
358
470
if(ret < 0){
359
perror("gpgme_data_read");
471
perror_plus("gpgme_data_read");
360
472
plaintext_length = -1;
361
473
goto decrypt_end;
362
474
}
364
476
}
365
477
366
478
if(debug){
367
fprintf(stderr, "Decrypted password is: ");
479
fprintf_plus(stderr, "Decrypted password is: ");
368
480
for(ssize_t i = 0; i < plaintext_length; i++){
369
481
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
370
482
}
381
493
return plaintext_length;
382
494
}
383
495
384
static const char * safer_gnutls_strerror(int value){
385
const char *ret = gnutls_strerror(value); /* Spurious warning from
386
-Wunreachable-code */
496
__attribute__((warn_unused_result))
497
static const char *safer_gnutls_strerror(int value){
498
const char *ret = gnutls_strerror(value);
387
499
if(ret == NULL)
388
500
ret = "(unknown)";
389
501
return ret;
390
502
}
391
503
392
504
/* GnuTLS log function callback */
505
__attribute__((nonnull))
393
506
static void debuggnutls(__attribute__((unused)) int level,
394
507
const char* string){
395
fprintf(stderr, "GnuTLS: %s", string);
508
fprintf_plus(stderr, "GnuTLS: %s", string);
396
509
}
397
510
511
__attribute__((nonnull, warn_unused_result))
398
512
static int init_gnutls_global(const char *pubkeyfilename,
399
const char *seckeyfilename){
513
const char *seckeyfilename,
514
mandos_context *mc){
400
515
int ret;
401
516
402
517
if(debug){
403
fprintf(stderr, "Initializing GnuTLS\n");
518
fprintf_plus(stderr, "Initializing GnuTLS\n");
404
519
}
405
520
406
521
ret = gnutls_global_init();
407
522
if(ret != GNUTLS_E_SUCCESS){
408
fprintf(stderr, "GnuTLS global_init: %s\n",
409
safer_gnutls_strerror(ret));
523
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
524
safer_gnutls_strerror(ret));
410
525
return -1;
411
526
}
412
527
419
534
}
420
535
421
536
/* OpenPGP credentials */
422
gnutls_certificate_allocate_credentials(&mc.cred);
537
ret = gnutls_certificate_allocate_credentials(&mc->cred);
423
538
if(ret != GNUTLS_E_SUCCESS){
424
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
425
from
426
-Wunreachable-code
427
*/
428
safer_gnutls_strerror(ret));
539
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
540
safer_gnutls_strerror(ret));
429
541
gnutls_global_deinit();
430
542
return -1;
431
543
}
432
544
433
545
if(debug){
434
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
435
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
436
seckeyfilename);
546
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
547
" secret key %s as GnuTLS credentials\n",
548
pubkeyfilename,
549
seckeyfilename);
437
550
}
438
551
439
552
ret = gnutls_certificate_set_openpgp_key_file
440
(mc.cred, pubkeyfilename, seckeyfilename,
553
(mc->cred, pubkeyfilename, seckeyfilename,
441
554
GNUTLS_OPENPGP_FMT_BASE64);
442
555
if(ret != GNUTLS_E_SUCCESS){
443
fprintf(stderr,
444
"Error[%d] while reading the OpenPGP key pair ('%s',"
445
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
446
fprintf(stderr, "The GnuTLS error is: %s\n",
447
safer_gnutls_strerror(ret));
556
fprintf_plus(stderr,
557
"Error[%d] while reading the OpenPGP key pair ('%s',"
558
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
559
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
560
safer_gnutls_strerror(ret));
448
561
goto globalfail;
449
562
}
450
563
451
564
/* GnuTLS server initialization */
452
ret = gnutls_dh_params_init(&mc.dh_params);
565
ret = gnutls_dh_params_init(&mc->dh_params);
453
566
if(ret != GNUTLS_E_SUCCESS){
454
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
455
" %s\n", safer_gnutls_strerror(ret));
567
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
568
" initialization: %s\n",
569
safer_gnutls_strerror(ret));
456
570
goto globalfail;
457
571
}
458
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
572
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
459
573
if(ret != GNUTLS_E_SUCCESS){
460
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
461
safer_gnutls_strerror(ret));
574
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
575
safer_gnutls_strerror(ret));
462
576
goto globalfail;
463
577
}
464
578
465
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
579
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
466
580
467
581
return 0;
468
582
469
583
globalfail:
470
584
471
gnutls_certificate_free_credentials(mc.cred);
585
gnutls_certificate_free_credentials(mc->cred);
472
586
gnutls_global_deinit();
473
gnutls_dh_params_deinit(mc.dh_params);
587
gnutls_dh_params_deinit(mc->dh_params);
474
588
return -1;
475
589
}
476
590
477
static int init_gnutls_session(gnutls_session_t *session){
591
__attribute__((nonnull, warn_unused_result))
592
static int init_gnutls_session(gnutls_session_t *session,
593
mandos_context *mc){
478
594
int ret;
479
595
/* GnuTLS session creation */
480
596
do {
484
600
}
485
601
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
486
602
if(ret != GNUTLS_E_SUCCESS){
487
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
488
safer_gnutls_strerror(ret));
603
fprintf_plus(stderr,
604
"Error in GnuTLS session initialization: %s\n",
605
safer_gnutls_strerror(ret));
489
606
}
490
607
491
608
{
492
609
const char *err;
493
610
do {
494
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
611
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
495
612
if(quit_now){
496
613
gnutls_deinit(*session);
497
614
return -1;
498
615
}
499
616
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
500
617
if(ret != GNUTLS_E_SUCCESS){
501
fprintf(stderr, "Syntax error at: %s\n", err);
502
fprintf(stderr, "GnuTLS error: %s\n",
503
safer_gnutls_strerror(ret));
618
fprintf_plus(stderr, "Syntax error at: %s\n", err);
619
fprintf_plus(stderr, "GnuTLS error: %s\n",
620
safer_gnutls_strerror(ret));
504
621
gnutls_deinit(*session);
505
622
return -1;
506
623
}
508
625
509
626
do {
510
627
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
511
mc.cred);
628
mc->cred);
512
629
if(quit_now){
513
630
gnutls_deinit(*session);
514
631
return -1;
515
632
}
516
633
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
517
634
if(ret != GNUTLS_E_SUCCESS){
518
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
519
safer_gnutls_strerror(ret));
635
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
636
safer_gnutls_strerror(ret));
520
637
gnutls_deinit(*session);
521
638
return -1;
522
639
}
524
641
/* ignore client certificate if any. */
525
642
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
526
643
527
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
644
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
528
645
529
646
return 0;
530
647
}
533
650
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
534
651
__attribute__((unused)) const char *txt){}
535
652
653
/* Set effective uid to 0, return errno */
654
__attribute__((warn_unused_result))
655
error_t raise_privileges(void){
656
error_t old_errno = errno;
657
error_t ret_errno = 0;
658
if(seteuid(0) == -1){
659
ret_errno = errno;
660
}
661
errno = old_errno;
662
return ret_errno;
663
}
664
665
/* Set effective and real user ID to 0. Return errno. */
666
__attribute__((warn_unused_result))
667
error_t raise_privileges_permanently(void){
668
error_t old_errno = errno;
669
error_t ret_errno = raise_privileges();
670
if(ret_errno != 0){
671
errno = old_errno;
672
return ret_errno;
673
}
674
if(setuid(0) == -1){
675
ret_errno = errno;
676
}
677
errno = old_errno;
678
return ret_errno;
679
}
680
681
/* Set effective user ID to unprivileged saved user ID */
682
__attribute__((warn_unused_result))
683
error_t lower_privileges(void){
684
error_t old_errno = errno;
685
error_t ret_errno = 0;
686
if(seteuid(uid) == -1){
687
ret_errno = errno;
688
}
689
errno = old_errno;
690
return ret_errno;
691
}
692
693
/* Lower privileges permanently */
694
__attribute__((warn_unused_result))
695
error_t lower_privileges_permanently(void){
696
error_t old_errno = errno;
697
error_t ret_errno = 0;
698
if(setuid(uid) == -1){
699
ret_errno = errno;
700
}
701
errno = old_errno;
702
return ret_errno;
703
}
704
705
/* Helper function to add_local_route() and delete_local_route() */
706
__attribute__((nonnull, warn_unused_result))
707
static bool add_delete_local_route(const bool add,
708
const char *address,
709
AvahiIfIndex if_index){
710
int ret;
711
char helper[] = "mandos-client-iprouteadddel";
712
char add_arg[] = "add";
713
char delete_arg[] = "delete";
714
char debug_flag[] = "--debug";
715
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
716
if(pluginhelperdir == NULL){
717
if(debug){
718
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
719
" variable not set; cannot run helper\n");
720
}
721
return false;
722
}
723
724
char interface[IF_NAMESIZE];
725
if(if_indextoname((unsigned int)if_index, interface) == NULL){
726
perror_plus("if_indextoname");
727
return false;
728
}
729
730
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
731
if(devnull == -1){
732
perror_plus("open(\"/dev/null\", O_RDONLY)");
733
return false;
734
}
735
pid_t pid = fork();
736
if(pid == 0){
737
/* Child */
738
/* Raise privileges */
739
errno = raise_privileges_permanently();
740
if(errno != 0){
741
perror_plus("Failed to raise privileges");
742
/* _exit(EX_NOPERM); */
743
} else {
744
/* Set group */
745
errno = 0;
746
ret = setgid(0);
747
if(ret == -1){
748
perror_plus("setgid");
749
_exit(EX_NOPERM);
750
}
751
/* Reset supplementary groups */
752
errno = 0;
753
ret = setgroups(0, NULL);
754
if(ret == -1){
755
perror_plus("setgroups");
756
_exit(EX_NOPERM);
757
}
758
}
759
ret = dup2(devnull, STDIN_FILENO);
760
if(ret == -1){
761
perror_plus("dup2(devnull, STDIN_FILENO)");
762
_exit(EX_OSERR);
763
}
764
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
765
if(ret == -1){
766
perror_plus("close");
767
_exit(EX_OSERR);
768
}
769
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
770
if(ret == -1){
771
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
772
_exit(EX_OSERR);
773
}
774
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
775
O_RDONLY
776
| O_DIRECTORY
777
| O_PATH
778
| O_CLOEXEC));
779
if(helperdir_fd == -1){
780
perror_plus("open");
781
_exit(EX_UNAVAILABLE);
782
}
783
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
784
helper, O_RDONLY));
785
if(helper_fd == -1){
786
perror_plus("openat");
787
_exit(EX_UNAVAILABLE);
788
}
789
TEMP_FAILURE_RETRY(close(helperdir_fd));
790
#ifdef __GNUC__
791
#pragma GCC diagnostic push
792
#pragma GCC diagnostic ignored "-Wcast-qual"
793
#endif
794
if(fexecve(helper_fd, (char *const [])
795
{ helper, add ? add_arg : delete_arg, (char *)address,
796
interface, debug ? debug_flag : NULL, NULL },
797
environ) == -1){
798
#ifdef __GNUC__
799
#pragma GCC diagnostic pop
800
#endif
801
perror_plus("fexecve");
802
_exit(EXIT_FAILURE);
803
}
804
}
805
if(pid == -1){
806
perror_plus("fork");
807
return false;
808
}
809
int status;
810
pid_t pret = -1;
811
errno = 0;
812
do {
813
pret = waitpid(pid, &status, 0);
814
if(pret == -1 and errno == EINTR and quit_now){
815
int errno_raising = 0;
816
if((errno = raise_privileges()) != 0){
817
errno_raising = errno;
818
perror_plus("Failed to raise privileges in order to"
819
" kill helper program");
820
}
821
if(kill(pid, SIGTERM) == -1){
822
perror_plus("kill");
823
}
824
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
825
perror_plus("Failed to lower privileges after killing"
826
" helper program");
827
}
828
return false;
829
}
830
} while(pret == -1 and errno == EINTR);
831
if(pret == -1){
832
perror_plus("waitpid");
833
return false;
834
}
835
if(WIFEXITED(status)){
836
if(WEXITSTATUS(status) != 0){
837
fprintf_plus(stderr, "Error: iprouteadddel exited"
838
" with status %d\n", WEXITSTATUS(status));
839
return false;
840
}
841
return true;
842
}
843
if(WIFSIGNALED(status)){
844
fprintf_plus(stderr, "Error: iprouteadddel died by"
845
" signal %d\n", WTERMSIG(status));
846
return false;
847
}
848
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
849
return false;
850
}
851
852
__attribute__((nonnull, warn_unused_result))
853
static bool add_local_route(const char *address,
854
AvahiIfIndex if_index){
855
if(debug){
856
fprintf_plus(stderr, "Adding route to %s\n", address);
857
}
858
return add_delete_local_route(true, address, if_index);
859
}
860
861
__attribute__((nonnull, warn_unused_result))
862
static bool delete_local_route(const char *address,
863
AvahiIfIndex if_index){
864
if(debug){
865
fprintf_plus(stderr, "Removing route to %s\n", address);
866
}
867
return add_delete_local_route(false, address, if_index);
868
}
869
536
870
/* Called when a Mandos server is found */
537
static int start_mandos_communication(const char *ip, uint16_t port,
871
__attribute__((nonnull, warn_unused_result))
872
static int start_mandos_communication(const char *ip, in_port_t port,
538
873
AvahiIfIndex if_index,
539
int af){
874
int af, mandos_context *mc){
540
875
int ret, tcp_sd = -1;
541
876
ssize_t sret;
542
union {
543
struct sockaddr_in in;
544
struct sockaddr_in6 in6;
545
} to;
877
struct sockaddr_storage to;
546
878
char *buffer = NULL;
547
879
char *decrypted_buffer = NULL;
548
880
size_t buffer_length = 0;
551
883
int retval = -1;
552
884
gnutls_session_t session;
553
885
int pf; /* Protocol family */
886
bool route_added = false;
887
888
errno = 0;
554
889
555
890
if(quit_now){
891
errno = EINTR;
556
892
return -1;
557
893
}
558
894
564
900
pf = PF_INET;
565
901
break;
566
902
default:
567
fprintf(stderr, "Bad address family: %d\n", af);
903
fprintf_plus(stderr, "Bad address family: %d\n", af);
904
errno = EINVAL;
568
905
return -1;
569
906
}
570
907
571
ret = init_gnutls_session(&session);
908
/* If the interface is specified and we have a list of interfaces */
909
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
910
/* Check if the interface is one of the interfaces we are using */
911
bool match = false;
912
{
913
char *interface = NULL;
914
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
915
interface))){
916
if(if_nametoindex(interface) == (unsigned int)if_index){
917
match = true;
918
break;
919
}
920
}
921
}
922
if(not match){
923
/* This interface does not match any in the list, so we don't
924
connect to the server */
925
if(debug){
926
char interface[IF_NAMESIZE];
927
if(if_indextoname((unsigned int)if_index, interface) == NULL){
928
perror_plus("if_indextoname");
929
} else {
930
fprintf_plus(stderr, "Skipping server on non-used interface"
931
" \"%s\"\n",
932
if_indextoname((unsigned int)if_index,
933
interface));
934
}
935
}
936
return -1;
937
}
938
}
939
940
ret = init_gnutls_session(&session, mc);
572
941
if(ret != 0){
573
942
return -1;
574
943
}
575
944
576
945
if(debug){
577
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
578
"\n", ip, port);
946
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
947
PRIuMAX "\n", ip, (uintmax_t)port);
579
948
}
580
949
581
tcp_sd = socket(pf, SOCK_STREAM, 0);
950
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
582
951
if(tcp_sd < 0){
583
perror("socket");
952
int e = errno;
953
perror_plus("socket");
954
errno = e;
584
955
goto mandos_end;
585
956
}
586
957
587
958
if(quit_now){
959
errno = EINTR;
588
960
goto mandos_end;
589
961
}
590
962
591
963
memset(&to, 0, sizeof(to));
592
964
if(af == AF_INET6){
593
to.in6.sin6_family = (sa_family_t)af;
594
ret = inet_pton(af, ip, &to.in6.sin6_addr);
965
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
966
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
595
967
} else { /* IPv4 */
596
to.in.sin_family = (sa_family_t)af;
597
ret = inet_pton(af, ip, &to.in.sin_addr);
968
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
969
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
598
970
}
599
971
if(ret < 0 ){
600
perror("inet_pton");
972
int e = errno;
973
perror_plus("inet_pton");
974
errno = e;
601
975
goto mandos_end;
602
976
}
603
977
if(ret == 0){
604
fprintf(stderr, "Bad address: %s\n", ip);
978
int e = errno;
979
fprintf_plus(stderr, "Bad address: %s\n", ip);
980
errno = e;
605
981
goto mandos_end;
606
982
}
607
983
if(af == AF_INET6){
608
to.in6.sin6_port = htons(port); /* Spurious warnings from
609
-Wconversion and
610
-Wunreachable-code */
611
612
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
613
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
614
-Wunreachable-code*/
984
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
985
if(IN6_IS_ADDR_LINKLOCAL
986
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
615
987
if(if_index == AVAHI_IF_UNSPEC){
616
fprintf(stderr, "An IPv6 link-local address is incomplete"
617
" without a network interface\n");
988
fprintf_plus(stderr, "An IPv6 link-local address is"
989
" incomplete without a network interface\n");
990
errno = EINVAL;
618
991
goto mandos_end;
619
992
}
620
993
/* Set the network interface number as scope */
621
to.in6.sin6_scope_id = (uint32_t)if_index;
994
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
622
995
}
623
996
} else {
624
to.in.sin_port = htons(port); /* Spurious warnings from
625
-Wconversion and
626
-Wunreachable-code */
997
((struct sockaddr_in *)&to)->sin_port = htons(port);
627
998
}
628
999
629
1000
if(quit_now){
1001
errno = EINTR;
630
1002
goto mandos_end;
631
1003
}
632
1004
634
1006
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
635
1007
char interface[IF_NAMESIZE];
636
1008
if(if_indextoname((unsigned int)if_index, interface) == NULL){
637
perror("if_indextoname");
1009
perror_plus("if_indextoname");
638
1010
} else {
639
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
640
ip, interface, port);
1011
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1012
"\n", ip, interface, (uintmax_t)port);
641
1013
}
642
1014
} else {
643
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
644
port);
1015
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1016
ip, (uintmax_t)port);
645
1017
}
646
1018
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
647
1019
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
648
const char *pcret;
649
if(af == AF_INET6){
650
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
651
sizeof(addrstr));
652
} else {
653
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
654
sizeof(addrstr));
655
}
656
if(pcret == NULL){
657
perror("inet_ntop");
658
} else {
659
if(strcmp(addrstr, ip) != 0){
660
fprintf(stderr, "Canonical address form: %s\n", addrstr);
661
}
662
}
663
}
664
665
if(quit_now){
666
goto mandos_end;
667
}
668
669
if(af == AF_INET6){
670
ret = connect(tcp_sd, &to.in6, sizeof(to));
671
} else {
672
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
673
}
674
if(ret < 0){
675
perror("connect");
676
goto mandos_end;
677
}
678
679
if(quit_now){
680
goto mandos_end;
1020
if(af == AF_INET6){
1021
ret = getnameinfo((struct sockaddr *)&to,
1022
sizeof(struct sockaddr_in6),
1023
addrstr, sizeof(addrstr), NULL, 0,
1024
NI_NUMERICHOST);
1025
} else {
1026
ret = getnameinfo((struct sockaddr *)&to,
1027
sizeof(struct sockaddr_in),
1028
addrstr, sizeof(addrstr), NULL, 0,
1029
NI_NUMERICHOST);
1030
}
1031
if(ret == EAI_SYSTEM){
1032
perror_plus("getnameinfo");
1033
} else if(ret != 0) {
1034
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1035
} else if(strcmp(addrstr, ip) != 0){
1036
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1037
}
1038
}
1039
1040
if(quit_now){
1041
errno = EINTR;
1042
goto mandos_end;
1043
}
1044
1045
while(true){
1046
if(af == AF_INET6){
1047
ret = connect(tcp_sd, (struct sockaddr *)&to,
1048
sizeof(struct sockaddr_in6));
1049
} else {
1050
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1051
sizeof(struct sockaddr_in));
1052
}
1053
if(ret < 0){
1054
if(errno == ENETUNREACH
1055
and if_index != AVAHI_IF_UNSPEC
1056
and connect_to == NULL
1057
and not route_added and
1058
((af == AF_INET6 and not
1059
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1060
&to)->sin6_addr)))
1061
or (af == AF_INET and
1062
/* Not a a IPv4LL address */
1063
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1064
& 0xFFFF0000L) != 0xA9FE0000L))){
1065
/* Work around Avahi bug - Avahi does not announce link-local
1066
addresses if it has a global address, so local hosts with
1067
*only* a link-local address (e.g. Mandos clients) cannot
1068
connect to a Mandos server announced by Avahi on a server
1069
host with a global address. Work around this by retrying
1070
with an explicit route added with the server's address.
1071
1072
Avahi bug reference:
1073
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1074
https://bugs.debian.org/587961
1075
*/
1076
if(debug){
1077
fprintf_plus(stderr, "Mandos server unreachable, trying"
1078
" direct route\n");
1079
}
1080
int e = errno;
1081
route_added = add_local_route(ip, if_index);
1082
if(route_added){
1083
continue;
1084
}
1085
errno = e;
1086
}
1087
if(errno != ECONNREFUSED or debug){
1088
int e = errno;
1089
perror_plus("connect");
1090
errno = e;
1091
}
1092
goto mandos_end;
1093
}
1094
1095
if(quit_now){
1096
errno = EINTR;
1097
goto mandos_end;
1098
}
1099
break;
681
1100
}
682
1101
683
1102
const char *out = mandos_protocol_version;
685
1104
while(true){
686
1105
size_t out_size = strlen(out);
687
1106
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
688
out_size - written));
1107
out_size - written));
689
1108
if(ret == -1){
690
perror("write");
1109
int e = errno;
1110
perror_plus("write");
1111
errno = e;
691
1112
goto mandos_end;
692
1113
}
693
1114
written += (size_t)ret;
703
1124
}
704
1125
705
1126
if(quit_now){
1127
errno = EINTR;
706
1128
goto mandos_end;
707
1129
}
708
1130
}
709
1131
710
1132
if(debug){
711
fprintf(stderr, "Establishing TLS session with %s\n", ip);
1133
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
712
1134
}
713
1135
714
1136
if(quit_now){
1137
errno = EINTR;
715
1138
goto mandos_end;
716
1139
}
717
1140
718
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1141
/* This casting via intptr_t is to eliminate warning about casting
1142
an int to a pointer type. This is exactly how the GnuTLS Guile
1143
function "set-session-transport-fd!" does it. */
1144
gnutls_transport_set_ptr(session,
1145
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
719
1146
720
1147
if(quit_now){
1148
errno = EINTR;
721
1149
goto mandos_end;
722
1150
}
723
1151
724
1152
do {
725
1153
ret = gnutls_handshake(session);
726
1154
if(quit_now){
1155
errno = EINTR;
727
1156
goto mandos_end;
728
1157
}
729
1158
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
730
1159
731
1160
if(ret != GNUTLS_E_SUCCESS){
732
1161
if(debug){
733
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1162
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
734
1163
gnutls_perror(ret);
735
1164
}
1165
errno = EPROTO;
736
1166
goto mandos_end;
737
1167
}
738
1168
739
1169
/* Read OpenPGP packet that contains the wanted password */
740
1170
741
1171
if(debug){
742
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
743
ip);
1172
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1173
" %s\n", ip);
744
1174
}
745
1175
746
1176
while(true){
747
1177
748
1178
if(quit_now){
1179
errno = EINTR;
749
1180
goto mandos_end;
750
1181
}
751
1182
752
1183
buffer_capacity = incbuffer(&buffer, buffer_length,
753
buffer_capacity);
1184
buffer_capacity);
754
1185
if(buffer_capacity == 0){
755
perror("incbuffer");
1186
int e = errno;
1187
perror_plus("incbuffer");
1188
errno = e;
756
1189
goto mandos_end;
757
1190
}
758
1191
759
1192
if(quit_now){
1193
errno = EINTR;
760
1194
goto mandos_end;
761
1195
}
762
1196
775
1209
ret = gnutls_handshake(session);
776
1210
777
1211
if(quit_now){
1212
errno = EINTR;
778
1213
goto mandos_end;
779
1214
}
780
1215
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
781
1216
if(ret < 0){
782
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1217
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1218
"***\n");
783
1219
gnutls_perror(ret);
1220
errno = EPROTO;
784
1221
goto mandos_end;
785
1222
}
786
1223
break;
787
1224
default:
788
fprintf(stderr, "Unknown error while reading data from"
789
" encrypted session with Mandos server\n");
1225
fprintf_plus(stderr, "Unknown error while reading data from"
1226
" encrypted session with Mandos server\n");
790
1227
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1228
errno = EIO;
791
1229
goto mandos_end;
792
1230
}
793
1231
} else {
796
1234
}
797
1235
798
1236
if(debug){
799
fprintf(stderr, "Closing TLS session\n");
1237
fprintf_plus(stderr, "Closing TLS session\n");
800
1238
}
801
1239
802
1240
if(quit_now){
1241
errno = EINTR;
803
1242
goto mandos_end;
804
1243
}
805
1244
806
1245
do {
807
1246
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
808
1247
if(quit_now){
1248
errno = EINTR;
809
1249
goto mandos_end;
810
1250
}
811
1251
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
812
1252
813
1253
if(buffer_length > 0){
814
1254
ssize_t decrypted_buffer_size;
815
decrypted_buffer_size = pgp_packet_decrypt(buffer,
816
buffer_length,
817
&decrypted_buffer);
1255
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1256
&decrypted_buffer, mc);
818
1257
if(decrypted_buffer_size >= 0){
819
1258
820
1259
written = 0;
821
1260
while(written < (size_t) decrypted_buffer_size){
822
1261
if(quit_now){
1262
errno = EINTR;
823
1263
goto mandos_end;
824
1264
}
825
1265
827
1267
(size_t)decrypted_buffer_size - written,
828
1268
stdout);
829
1269
if(ret == 0 and ferror(stdout)){
1270
int e = errno;
830
1271
if(debug){
831
fprintf(stderr, "Error writing encrypted data: %s\n",
832
strerror(errno));
1272
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1273
strerror(errno));
833
1274
}
1275
errno = e;
834
1276
goto mandos_end;
835
1277
}
836
1278
written += (size_t)ret;
842
1284
/* Shutdown procedure */
843
1285
844
1286
mandos_end:
845
free(decrypted_buffer);
846
free(buffer);
847
if(tcp_sd >= 0){
848
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
849
}
850
if(ret == -1){
851
perror("close");
852
}
853
gnutls_deinit(session);
854
if(quit_now){
855
retval = -1;
1287
{
1288
if(route_added){
1289
if(not delete_local_route(ip, if_index)){
1290
fprintf_plus(stderr, "Failed to delete local route to %s on"
1291
" interface %d", ip, if_index);
1292
}
1293
}
1294
int e = errno;
1295
free(decrypted_buffer);
1296
free(buffer);
1297
if(tcp_sd >= 0){
1298
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1299
}
1300
if(ret == -1){
1301
if(e == 0){
1302
e = errno;
1303
}
1304
perror_plus("close");
1305
}
1306
gnutls_deinit(session);
1307
errno = e;
1308
if(quit_now){
1309
errno = EINTR;
1310
retval = -1;
1311
}
856
1312
}
857
1313
return retval;
858
1314
}
859
1315
1316
__attribute__((nonnull))
860
1317
static void resolve_callback(AvahiSServiceResolver *r,
861
1318
AvahiIfIndex interface,
862
1319
AvahiProtocol proto,
870
1327
AVAHI_GCC_UNUSED AvahiStringList *txt,
871
1328
AVAHI_GCC_UNUSED AvahiLookupResultFlags
872
1329
flags,
873
AVAHI_GCC_UNUSED void* userdata){
874
assert(r);
1330
void *mc){
1331
if(r == NULL){
1332
return;
1333
}
875
1334
876
1335
/* Called whenever a service has been resolved successfully or
877
1336
timed out */
878
1337
879
1338
if(quit_now){
1339
avahi_s_service_resolver_free(r);
880
1340
return;
881
1341
}
882
1342
883
1343
switch(event){
884
1344
default:
885
1345
case AVAHI_RESOLVER_FAILURE:
886
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
887
" of type '%s' in domain '%s': %s\n", name, type, domain,
888
avahi_strerror(avahi_server_errno(mc.server)));
1346
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1347
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1348
domain,
1349
avahi_strerror(avahi_server_errno
1350
(((mandos_context*)mc)->server)));
889
1351
break;
890
1352
891
1353
case AVAHI_RESOLVER_FOUND:
893
1355
char ip[AVAHI_ADDRESS_STR_MAX];
894
1356
avahi_address_snprint(ip, sizeof(ip), address);
895
1357
if(debug){
896
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
897
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
898
ip, (intmax_t)interface, port);
1358
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1359
PRIdMAX ") on port %" PRIu16 "\n", name,
1360
host_name, ip, (intmax_t)interface, port);
899
1361
}
900
int ret = start_mandos_communication(ip, port, interface,
901
avahi_proto_to_af(proto));
1362
int ret = start_mandos_communication(ip, (in_port_t)port,
1363
interface,
1364
avahi_proto_to_af(proto),
1365
mc);
902
1366
if(ret == 0){
903
avahi_simple_poll_quit(mc.simple_poll);
1367
avahi_simple_poll_quit(simple_poll);
1368
} else {
1369
if(not add_server(ip, (in_port_t)port, interface,
1370
avahi_proto_to_af(proto),
1371
&((mandos_context*)mc)->current_server)){
1372
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1373
" list\n", name);
1374
}
904
1375
}
905
1376
}
906
1377
}
916
1387
const char *domain,
917
1388
AVAHI_GCC_UNUSED AvahiLookupResultFlags
918
1389
flags,
919
AVAHI_GCC_UNUSED void* userdata){
920
assert(b);
1390
void *mc){
1391
if(b == NULL){
1392
return;
1393
}
921
1394
922
1395
/* Called whenever a new services becomes available on the LAN or
923
1396
is removed from the LAN */
930
1403
default:
931
1404
case AVAHI_BROWSER_FAILURE:
932
1405
933
fprintf(stderr, "(Avahi browser) %s\n",
934
avahi_strerror(avahi_server_errno(mc.server)));
935
avahi_simple_poll_quit(mc.simple_poll);
1406
fprintf_plus(stderr, "(Avahi browser) %s\n",
1407
avahi_strerror(avahi_server_errno
1408
(((mandos_context*)mc)->server)));
1409
avahi_simple_poll_quit(simple_poll);
936
1410
return;
937
1411
938
1412
case AVAHI_BROWSER_NEW:
941
1415
the callback function is called the Avahi server will free the
942
1416
resolver for us. */
943
1417
944
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
945
name, type, domain, protocol, 0,
946
resolve_callback, NULL) == NULL)
947
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
948
name, avahi_strerror(avahi_server_errno(mc.server)));
1418
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1419
interface, protocol, name, type,
1420
domain, protocol, 0,
1421
resolve_callback, mc) == NULL)
1422
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1423
" %s\n", name,
1424
avahi_strerror(avahi_server_errno
1425
(((mandos_context*)mc)->server)));
949
1426
break;
950
1427
951
1428
case AVAHI_BROWSER_REMOVE:
954
1431
case AVAHI_BROWSER_ALL_FOR_NOW:
955
1432
case AVAHI_BROWSER_CACHE_EXHAUSTED:
956
1433
if(debug){
957
fprintf(stderr, "No Mandos server found, still searching...\n");
1434
fprintf_plus(stderr, "No Mandos server found, still"
1435
" searching...\n");
958
1436
}
959
1437
break;
960
1438
}
961
1439
}
962
1440
963
/* stop main loop after sigterm has been called */
1441
/* Signal handler that stops main loop after SIGTERM */
964
1442
static void handle_sigterm(int sig){
965
1443
if(quit_now){
966
1444
return;
968
1446
quit_now = 1;
969
1447
signal_received = sig;
970
1448
int old_errno = errno;
971
if(mc.simple_poll != NULL){
972
avahi_simple_poll_quit(mc.simple_poll);
973
}
974
errno = old_errno;
1449
/* set main loop to exit */
1450
if(simple_poll != NULL){
1451
avahi_simple_poll_quit(simple_poll);
1452
}
1453
errno = old_errno;
1454
}
1455
1456
__attribute__((nonnull, warn_unused_result))
1457
bool get_flags(const char *ifname, struct ifreq *ifr){
1458
int ret;
1459
error_t ret_errno;
1460
1461
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1462
if(s < 0){
1463
ret_errno = errno;
1464
perror_plus("socket");
1465
errno = ret_errno;
1466
return false;
1467
}
1468
strcpy(ifr->ifr_name, ifname);
1469
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1470
if(ret == -1){
1471
if(debug){
1472
ret_errno = errno;
1473
perror_plus("ioctl SIOCGIFFLAGS");
1474
errno = ret_errno;
1475
}
1476
return false;
1477
}
1478
return true;
1479
}
1480
1481
__attribute__((nonnull, warn_unused_result))
1482
bool good_flags(const char *ifname, const struct ifreq *ifr){
1483
1484
/* Reject the loopback device */
1485
if(ifr->ifr_flags & IFF_LOOPBACK){
1486
if(debug){
1487
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1488
ifname);
1489
}
1490
return false;
1491
}
1492
/* Accept point-to-point devices only if connect_to is specified */
1493
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1494
if(debug){
1495
fprintf_plus(stderr, "Accepting point-to-point interface"
1496
" \"%s\"\n", ifname);
1497
}
1498
return true;
1499
}
1500
/* Otherwise, reject non-broadcast-capable devices */
1501
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1502
if(debug){
1503
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1504
" \"%s\"\n", ifname);
1505
}
1506
return false;
1507
}
1508
/* Reject non-ARP interfaces (including dummy interfaces) */
1509
if(ifr->ifr_flags & IFF_NOARP){
1510
if(debug){
1511
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1512
ifname);
1513
}
1514
return false;
1515
}
1516
1517
/* Accept this device */
1518
if(debug){
1519
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1520
}
1521
return true;
1522
}
1523
1524
/*
1525
* This function determines if a directory entry in /sys/class/net
1526
* corresponds to an acceptable network device.
1527
* (This function is passed to scandir(3) as a filter function.)
1528
*/
1529
__attribute__((nonnull, warn_unused_result))
1530
int good_interface(const struct dirent *if_entry){
1531
if(if_entry->d_name[0] == '.'){
1532
return 0;
1533
}
1534
1535
struct ifreq ifr;
1536
if(not get_flags(if_entry->d_name, &ifr)){
1537
if(debug){
1538
fprintf_plus(stderr, "Failed to get flags for interface "
1539
"\"%s\"\n", if_entry->d_name);
1540
}
1541
return 0;
1542
}
1543
1544
if(not good_flags(if_entry->d_name, &ifr)){
1545
return 0;
1546
}
1547
return 1;
1548
}
1549
1550
/*
1551
* This function determines if a network interface is up.
1552
*/
1553
__attribute__((nonnull, warn_unused_result))
1554
bool interface_is_up(const char *interface){
1555
struct ifreq ifr;
1556
if(not get_flags(interface, &ifr)){
1557
if(debug){
1558
fprintf_plus(stderr, "Failed to get flags for interface "
1559
"\"%s\"\n", interface);
1560
}
1561
return false;
1562
}
1563
1564
return (bool)(ifr.ifr_flags & IFF_UP);
1565
}
1566
1567
/*
1568
* This function determines if a network interface is running
1569
*/
1570
__attribute__((nonnull, warn_unused_result))
1571
bool interface_is_running(const char *interface){
1572
struct ifreq ifr;
1573
if(not get_flags(interface, &ifr)){
1574
if(debug){
1575
fprintf_plus(stderr, "Failed to get flags for interface "
1576
"\"%s\"\n", interface);
1577
}
1578
return false;
1579
}
1580
1581
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1582
}
1583
1584
__attribute__((nonnull, pure, warn_unused_result))
1585
int notdotentries(const struct dirent *direntry){
1586
/* Skip "." and ".." */
1587
if(direntry->d_name[0] == '.'
1588
and (direntry->d_name[1] == '\0'
1589
or (direntry->d_name[1] == '.'
1590
and direntry->d_name[2] == '\0'))){
1591
return 0;
1592
}
1593
return 1;
1594
}
1595
1596
/* Is this directory entry a runnable program? */
1597
__attribute__((nonnull, warn_unused_result))
1598
int runnable_hook(const struct dirent *direntry){
1599
int ret;
1600
size_t sret;
1601
struct stat st;
1602
1603
if((direntry->d_name)[0] == '\0'){
1604
/* Empty name? */
1605
return 0;
1606
}
1607
1608
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1609
"abcdefghijklmnopqrstuvwxyz"
1610
"0123456789"
1611
"_.-");
1612
if((direntry->d_name)[sret] != '\0'){
1613
/* Contains non-allowed characters */
1614
if(debug){
1615
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1616
direntry->d_name);
1617
}
1618
return 0;
1619
}
1620
1621
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1622
if(ret == -1){
1623
if(debug){
1624
perror_plus("Could not stat hook");
1625
}
1626
return 0;
1627
}
1628
if(not (S_ISREG(st.st_mode))){
1629
/* Not a regular file */
1630
if(debug){
1631
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1632
direntry->d_name);
1633
}
1634
return 0;
1635
}
1636
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1637
/* Not executable */
1638
if(debug){
1639
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1640
direntry->d_name);
1641
}
1642
return 0;
1643
}
1644
if(debug){
1645
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1646
direntry->d_name);
1647
}
1648
return 1;
1649
}
1650
1651
__attribute__((nonnull, warn_unused_result))
1652
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1653
mandos_context *mc){
1654
int ret;
1655
struct timespec now;
1656
struct timespec waited_time;
1657
intmax_t block_time;
1658
1659
while(true){
1660
if(mc->current_server == NULL){
1661
if(debug){
1662
fprintf_plus(stderr, "Wait until first server is found."
1663
" No timeout!\n");
1664
}
1665
ret = avahi_simple_poll_iterate(s, -1);
1666
} else {
1667
if(debug){
1668
fprintf_plus(stderr, "Check current_server if we should run"
1669
" it, or wait\n");
1670
}
1671
/* the current time */
1672
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1673
if(ret == -1){
1674
perror_plus("clock_gettime");
1675
return -1;
1676
}
1677
/* Calculating in ms how long time between now and server
1678
who we visted longest time ago. Now - last seen. */
1679
waited_time.tv_sec = (now.tv_sec
1680
- mc->current_server->last_seen.tv_sec);
1681
waited_time.tv_nsec = (now.tv_nsec
1682
- mc->current_server->last_seen.tv_nsec);
1683
/* total time is 10s/10,000ms.
1684
Converting to s from ms by dividing by 1,000,
1685
and ns to ms by dividing by 1,000,000. */
1686
block_time = ((retry_interval
1687
- ((intmax_t)waited_time.tv_sec * 1000))
1688
- ((intmax_t)waited_time.tv_nsec / 1000000));
1689
1690
if(debug){
1691
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1692
block_time);
1693
}
1694
1695
if(block_time <= 0){
1696
ret = start_mandos_communication(mc->current_server->ip,
1697
mc->current_server->port,
1698
mc->current_server->if_index,
1699
mc->current_server->af, mc);
1700
if(ret == 0){
1701
avahi_simple_poll_quit(s);
1702
return 0;
1703
}
1704
ret = clock_gettime(CLOCK_MONOTONIC,
1705
&mc->current_server->last_seen);
1706
if(ret == -1){
1707
perror_plus("clock_gettime");
1708
return -1;
1709
}
1710
mc->current_server = mc->current_server->next;
1711
block_time = 0; /* Call avahi to find new Mandos
1712
servers, but don't block */
1713
}
1714
1715
ret = avahi_simple_poll_iterate(s, (int)block_time);
1716
}
1717
if(ret != 0){
1718
if(ret > 0 or errno != EINTR){
1719
return (ret != 1) ? ret : 0;
1720
}
1721
}
1722
}
1723
}
1724
1725
__attribute__((nonnull))
1726
void run_network_hooks(const char *mode, const char *interface,
1727
const float delay){
1728
struct dirent **direntries = NULL;
1729
if(hookdir_fd == -1){
1730
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1731
| O_CLOEXEC);
1732
if(hookdir_fd == -1){
1733
if(errno == ENOENT){
1734
if(debug){
1735
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1736
" found\n", hookdir);
1737
}
1738
} else {
1739
perror_plus("open");
1740
}
1741
return;
1742
}
1743
}
1744
#ifdef __GLIBC__
1745
#if __GLIBC_PREREQ(2, 15)
1746
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1747
runnable_hook, alphasort);
1748
#else /* not __GLIBC_PREREQ(2, 15) */
1749
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1750
alphasort);
1751
#endif /* not __GLIBC_PREREQ(2, 15) */
1752
#else /* not __GLIBC__ */
1753
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1754
alphasort);
1755
#endif /* not __GLIBC__ */
1756
if(numhooks == -1){
1757
perror_plus("scandir");
1758
return;
1759
}
1760
struct dirent *direntry;
1761
int ret;
1762
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1763
if(devnull == -1){
1764
perror_plus("open(\"/dev/null\", O_RDONLY)");
1765
return;
1766
}
1767
for(int i = 0; i < numhooks; i++){
1768
direntry = direntries[i];
1769
if(debug){
1770
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1771
direntry->d_name);
1772
}
1773
pid_t hook_pid = fork();
1774
if(hook_pid == 0){
1775
/* Child */
1776
/* Raise privileges */
1777
errno = raise_privileges_permanently();
1778
if(errno != 0){
1779
perror_plus("Failed to raise privileges");
1780
_exit(EX_NOPERM);
1781
}
1782
/* Set group */
1783
errno = 0;
1784
ret = setgid(0);
1785
if(ret == -1){
1786
perror_plus("setgid");
1787
_exit(EX_NOPERM);
1788
}
1789
/* Reset supplementary groups */
1790
errno = 0;
1791
ret = setgroups(0, NULL);
1792
if(ret == -1){
1793
perror_plus("setgroups");
1794
_exit(EX_NOPERM);
1795
}
1796
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1797
if(ret == -1){
1798
perror_plus("setenv");
1799
_exit(EX_OSERR);
1800
}
1801
ret = setenv("DEVICE", interface, 1);
1802
if(ret == -1){
1803
perror_plus("setenv");
1804
_exit(EX_OSERR);
1805
}
1806
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1807
if(ret == -1){
1808
perror_plus("setenv");
1809
_exit(EX_OSERR);
1810
}
1811
ret = setenv("MODE", mode, 1);
1812
if(ret == -1){
1813
perror_plus("setenv");
1814
_exit(EX_OSERR);
1815
}
1816
char *delaystring;
1817
ret = asprintf(&delaystring, "%f", (double)delay);
1818
if(ret == -1){
1819
perror_plus("asprintf");
1820
_exit(EX_OSERR);
1821
}
1822
ret = setenv("DELAY", delaystring, 1);
1823
if(ret == -1){
1824
free(delaystring);
1825
perror_plus("setenv");
1826
_exit(EX_OSERR);
1827
}
1828
free(delaystring);
1829
if(connect_to != NULL){
1830
ret = setenv("CONNECT", connect_to, 1);
1831
if(ret == -1){
1832
perror_plus("setenv");
1833
_exit(EX_OSERR);
1834
}
1835
}
1836
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
1837
direntry->d_name,
1838
O_RDONLY));
1839
if(hook_fd == -1){
1840
perror_plus("openat");
1841
_exit(EXIT_FAILURE);
1842
}
1843
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1844
perror_plus("close");
1845
_exit(EXIT_FAILURE);
1846
}
1847
ret = dup2(devnull, STDIN_FILENO);
1848
if(ret == -1){
1849
perror_plus("dup2(devnull, STDIN_FILENO)");
1850
_exit(EX_OSERR);
1851
}
1852
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
1853
if(ret == -1){
1854
perror_plus("close");
1855
_exit(EX_OSERR);
1856
}
1857
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1858
if(ret == -1){
1859
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1860
_exit(EX_OSERR);
1861
}
1862
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1863
environ) == -1){
1864
perror_plus("fexecve");
1865
_exit(EXIT_FAILURE);
1866
}
1867
} else {
1868
if(hook_pid == -1){
1869
perror_plus("fork");
1870
free(direntry);
1871
continue;
1872
}
1873
int status;
1874
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1875
perror_plus("waitpid");
1876
free(direntry);
1877
continue;
1878
}
1879
if(WIFEXITED(status)){
1880
if(WEXITSTATUS(status) != 0){
1881
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1882
" with status %d\n", direntry->d_name,
1883
WEXITSTATUS(status));
1884
free(direntry);
1885
continue;
1886
}
1887
} else if(WIFSIGNALED(status)){
1888
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1889
" signal %d\n", direntry->d_name,
1890
WTERMSIG(status));
1891
free(direntry);
1892
continue;
1893
} else {
1894
fprintf_plus(stderr, "Warning: network hook \"%s\""
1895
" crashed\n", direntry->d_name);
1896
free(direntry);
1897
continue;
1898
}
1899
}
1900
if(debug){
1901
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1902
direntry->d_name);
1903
}
1904
free(direntry);
1905
}
1906
free(direntries);
1907
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1908
perror_plus("close");
1909
} else {
1910
hookdir_fd = -1;
1911
}
1912
close(devnull);
1913
}
1914
1915
__attribute__((nonnull, warn_unused_result))
1916
error_t bring_up_interface(const char *const interface,
1917
const float delay){
1918
error_t old_errno = errno;
1919
int ret;
1920
struct ifreq network;
1921
unsigned int if_index = if_nametoindex(interface);
1922
if(if_index == 0){
1923
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1924
errno = old_errno;
1925
return ENXIO;
1926
}
1927
1928
if(quit_now){
1929
errno = old_errno;
1930
return EINTR;
1931
}
1932
1933
if(not interface_is_up(interface)){
1934
error_t ret_errno = 0, ioctl_errno = 0;
1935
if(not get_flags(interface, &network)){
1936
ret_errno = errno;
1937
fprintf_plus(stderr, "Failed to get flags for interface "
1938
"\"%s\"\n", interface);
1939
errno = old_errno;
1940
return ret_errno;
1941
}
1942
network.ifr_flags |= IFF_UP; /* set flag */
1943
1944
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1945
if(sd == -1){
1946
ret_errno = errno;
1947
perror_plus("socket");
1948
errno = old_errno;
1949
return ret_errno;
1950
}
1951
1952
if(quit_now){
1953
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1954
if(ret == -1){
1955
perror_plus("close");
1956
}
1957
errno = old_errno;
1958
return EINTR;
1959
}
1960
1961
if(debug){
1962
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1963
interface);
1964
}
1965
1966
/* Raise privileges */
1967
ret_errno = raise_privileges();
1968
if(ret_errno != 0){
1969
errno = ret_errno;
1970
perror_plus("Failed to raise privileges");
1971
}
1972
1973
#ifdef __linux__
1974
int ret_linux;
1975
bool restore_loglevel = false;
1976
if(ret_errno == 0){
1977
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1978
messages about the network interface to mess up the prompt */
1979
ret_linux = klogctl(8, NULL, 5);
1980
if(ret_linux == -1){
1981
perror_plus("klogctl");
1982
} else {
1983
restore_loglevel = true;
1984
}
1985
}
1986
#endif /* __linux__ */
1987
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1988
ioctl_errno = errno;
1989
#ifdef __linux__
1990
if(restore_loglevel){
1991
ret_linux = klogctl(7, NULL, 0);
1992
if(ret_linux == -1){
1993
perror_plus("klogctl");
1994
}
1995
}
1996
#endif /* __linux__ */
1997
1998
/* If raise_privileges() succeeded above */
1999
if(ret_errno == 0){
2000
/* Lower privileges */
2001
ret_errno = lower_privileges();
2002
if(ret_errno != 0){
2003
errno = ret_errno;
2004
perror_plus("Failed to lower privileges");
2005
}
2006
}
2007
2008
/* Close the socket */
2009
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2010
if(ret == -1){
2011
perror_plus("close");
2012
}
2013
2014
if(ret_setflags == -1){
2015
errno = ioctl_errno;
2016
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2017
errno = old_errno;
2018
return ioctl_errno;
2019
}
2020
} else if(debug){
2021
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2022
interface);
2023
}
2024
2025
/* Sleep checking until interface is running.
2026
Check every 0.25s, up to total time of delay */
2027
for(int i=0; i < delay * 4; i++){
2028
if(interface_is_running(interface)){
2029
break;
2030
}
2031
struct timespec sleeptime = { .tv_nsec = 250000000 };
2032
ret = nanosleep(&sleeptime, NULL);
2033
if(ret == -1 and errno != EINTR){
2034
perror_plus("nanosleep");
2035
}
2036
}
2037
2038
errno = old_errno;
2039
return 0;
2040
}
2041
2042
__attribute__((nonnull, warn_unused_result))
2043
error_t take_down_interface(const char *const interface){
2044
error_t old_errno = errno;
2045
struct ifreq network;
2046
unsigned int if_index = if_nametoindex(interface);
2047
if(if_index == 0){
2048
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2049
errno = old_errno;
2050
return ENXIO;
2051
}
2052
if(interface_is_up(interface)){
2053
error_t ret_errno = 0, ioctl_errno = 0;
2054
if(not get_flags(interface, &network) and debug){
2055
ret_errno = errno;
2056
fprintf_plus(stderr, "Failed to get flags for interface "
2057
"\"%s\"\n", interface);
2058
errno = old_errno;
2059
return ret_errno;
2060
}
2061
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2062
2063
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2064
if(sd == -1){
2065
ret_errno = errno;
2066
perror_plus("socket");
2067
errno = old_errno;
2068
return ret_errno;
2069
}
2070
2071
if(debug){
2072
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2073
interface);
2074
}
2075
2076
/* Raise privileges */
2077
ret_errno = raise_privileges();
2078
if(ret_errno != 0){
2079
errno = ret_errno;
2080
perror_plus("Failed to raise privileges");
2081
}
2082
2083
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2084
ioctl_errno = errno;
2085
2086
/* If raise_privileges() succeeded above */
2087
if(ret_errno == 0){
2088
/* Lower privileges */
2089
ret_errno = lower_privileges();
2090
if(ret_errno != 0){
2091
errno = ret_errno;
2092
perror_plus("Failed to lower privileges");
2093
}
2094
}
2095
2096
/* Close the socket */
2097
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2098
if(ret == -1){
2099
perror_plus("close");
2100
}
2101
2102
if(ret_setflags == -1){
2103
errno = ioctl_errno;
2104
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2105
errno = old_errno;
2106
return ioctl_errno;
2107
}
2108
} else if(debug){
2109
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2110
interface);
2111
}
2112
2113
errno = old_errno;
2114
return 0;
975
2115
}
976
2116
977
2117
int main(int argc, char *argv[]){
2118
mandos_context mc = { .server = NULL, .dh_bits = 1024,
2119
.priority = "SECURE256:!CTYPE-X.509:"
2120
"+CTYPE-OPENPGP", .current_server = NULL,
2121
.interfaces = NULL, .interfaces_size = 0 };
978
2122
AvahiSServiceBrowser *sb = NULL;
979
int error;
2123
error_t ret_errno;
980
2124
int ret;
981
2125
intmax_t tmpmax;
982
2126
char *tmp;
983
2127
int exitcode = EXIT_SUCCESS;
984
const char *interface = "eth0";
985
struct ifreq network;
986
int sd = -1;
987
bool take_down_interface = false;
988
uid_t uid;
989
gid_t gid;
990
char *connect_to = NULL;
991
char tempdir[] = "/tmp/mandosXXXXXX";
992
bool tempdir_created = false;
2128
char *interfaces_to_take_down = NULL;
2129
size_t interfaces_to_take_down_size = 0;
2130
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2131
char old_tempdir[] = "/tmp/mandosXXXXXX";
2132
char *tempdir = NULL;
993
2133
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
994
2134
const char *seckey = PATHDIR "/" SECKEY;
995
2135
const char *pubkey = PATHDIR "/" PUBKEY;
2136
char *interfaces_hooks = NULL;
996
2137
997
2138
bool gnutls_initialized = false;
998
2139
bool gpgme_initialized = false;
999
2140
float delay = 2.5f;
2141
double retry_interval = 10; /* 10s between trying a server and
2142
retrying the same server again */
1000
2143
1001
2144
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1002
2145
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1008
2151
errno = 0;
1009
2152
ret = setgid(gid);
1010
2153
if(ret == -1){
1011
perror("setgid");
2154
perror_plus("setgid");
1012
2155
}
1013
2156
1014
2157
/* Lower user privileges (temporarily) */
1015
2158
errno = 0;
1016
2159
ret = seteuid(uid);
1017
2160
if(ret == -1){
1018
perror("seteuid");
2161
perror_plus("seteuid");
1019
2162
}
1020
2163
1021
2164
if(quit_now){
1056
2199
.arg = "SECONDS",
1057
2200
.doc = "Maximum delay to wait for interface startup",
1058
2201
.group = 2 },
2202
{ .name = "retry", .key = 132,
2203
.arg = "SECONDS",
2204
.doc = "Retry interval used when denied by the Mandos server",
2205
.group = 2 },
2206
{ .name = "network-hook-dir", .key = 133,
2207
.arg = "DIR",
2208
.doc = "Directory where network hooks are located",
2209
.group = 2 },
2210
/*
2211
* These reproduce what we would get without ARGP_NO_HELP
2212
*/
2213
{ .name = "help", .key = '?',
2214
.doc = "Give this help list", .group = -1 },
2215
{ .name = "usage", .key = -3,
2216
.doc = "Give a short usage message", .group = -1 },
2217
{ .name = "version", .key = 'V',
2218
.doc = "Print program version", .group = -1 },
1059
2219
{ .name = NULL }
1060
2220
};
1061
2221
1062
2222
error_t parse_opt(int key, char *arg,
1063
2223
struct argp_state *state){
2224
errno = 0;
1064
2225
switch(key){
1065
2226
case 128: /* --debug */
1066
2227
debug = true;
1069
2230
connect_to = arg;
1070
2231
break;
1071
2232
case 'i': /* --interface */
1072
interface = arg;
2233
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2234
arg, (int)',');
2235
if(ret_errno != 0){
2236
argp_error(state, "%s", strerror(ret_errno));
2237
}
1073
2238
break;
1074
2239
case 's': /* --seckey */
1075
2240
seckey = arg;
1082
2247
tmpmax = strtoimax(arg, &tmp, 10);
1083
2248
if(errno != 0 or tmp == arg or *tmp != '\0'
1084
2249
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1085
fprintf(stderr, "Bad number of DH bits\n");
1086
exit(EXIT_FAILURE);
2250
argp_error(state, "Bad number of DH bits");
1087
2251
}
1088
2252
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1089
2253
break;
1094
2258
errno = 0;
1095
2259
delay = strtof(arg, &tmp);
1096
2260
if(errno != 0 or tmp == arg or *tmp != '\0'){
1097
fprintf(stderr, "Bad delay\n");
1098
exit(EXIT_FAILURE);
1099
}
1100
break;
1101
case ARGP_KEY_ARG:
1102
argp_usage(state);
1103
case ARGP_KEY_END:
2261
argp_error(state, "Bad delay");
2262
}
2263
case 132: /* --retry */
2264
errno = 0;
2265
retry_interval = strtod(arg, &tmp);
2266
if(errno != 0 or tmp == arg or *tmp != '\0'
2267
or (retry_interval * 1000) > INT_MAX
2268
or retry_interval < 0){
2269
argp_error(state, "Bad retry interval");
2270
}
2271
break;
2272
case 133: /* --network-hook-dir */
2273
hookdir = arg;
2274
break;
2275
/*
2276
* These reproduce what we would get without ARGP_NO_HELP
2277
*/
2278
case '?': /* --help */
2279
argp_state_help(state, state->out_stream,
2280
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2281
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2282
case -3: /* --usage */
2283
argp_state_help(state, state->out_stream,
2284
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2285
case 'V': /* --version */
2286
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2287
exit(argp_err_exit_status);
1104
2288
break;
1105
2289
default:
1106
2290
return ARGP_ERR_UNKNOWN;
1107
2291
}
1108
return 0;
2292
return errno;
1109
2293
}
1110
2294
1111
2295
struct argp argp = { .options = options, .parser = parse_opt,
1112
2296
.args_doc = "",
1113
2297
.doc = "Mandos client -- Get and decrypt"
1114
2298
" passwords from a Mandos server" };
1115
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1116
if(ret == ARGP_ERR_UNKNOWN){
1117
fprintf(stderr, "Unknown error while parsing arguments\n");
1118
exitcode = EXIT_FAILURE;
1119
goto end;
1120
}
2299
ret = argp_parse(&argp, argc, argv,
2300
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2301
switch(ret){
2302
case 0:
2303
break;
2304
case ENOMEM:
2305
default:
2306
errno = ret;
2307
perror_plus("argp_parse");
2308
exitcode = EX_OSERR;
2309
goto end;
2310
case EINVAL:
2311
exitcode = EX_USAGE;
2312
goto end;
2313
}
2314
}
2315
2316
{
2317
/* Work around Debian bug #633582:
2318
<http://bugs.debian.org/633582> */
2319
2320
/* Re-raise privileges */
2321
ret_errno = raise_privileges();
2322
if(ret_errno != 0){
2323
errno = ret_errno;
2324
perror_plus("Failed to raise privileges");
2325
} else {
2326
struct stat st;
2327
2328
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2329
int seckey_fd = open(seckey, O_RDONLY);
2330
if(seckey_fd == -1){
2331
perror_plus("open");
2332
} else {
2333
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2334
if(ret == -1){
2335
perror_plus("fstat");
2336
} else {
2337
if(S_ISREG(st.st_mode)
2338
and st.st_uid == 0 and st.st_gid == 0){
2339
ret = fchown(seckey_fd, uid, gid);
2340
if(ret == -1){
2341
perror_plus("fchown");
2342
}
2343
}
2344
}
2345
TEMP_FAILURE_RETRY(close(seckey_fd));
2346
}
2347
}
2348
2349
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2350
int pubkey_fd = open(pubkey, O_RDONLY);
2351
if(pubkey_fd == -1){
2352
perror_plus("open");
2353
} else {
2354
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2355
if(ret == -1){
2356
perror_plus("fstat");
2357
} else {
2358
if(S_ISREG(st.st_mode)
2359
and st.st_uid == 0 and st.st_gid == 0){
2360
ret = fchown(pubkey_fd, uid, gid);
2361
if(ret == -1){
2362
perror_plus("fchown");
2363
}
2364
}
2365
}
2366
TEMP_FAILURE_RETRY(close(pubkey_fd));
2367
}
2368
}
2369
2370
/* Lower privileges */
2371
ret_errno = lower_privileges();
2372
if(ret_errno != 0){
2373
errno = ret_errno;
2374
perror_plus("Failed to lower privileges");
2375
}
2376
}
2377
}
2378
2379
/* Remove invalid interface names (except "none") */
2380
{
2381
char *interface = NULL;
2382
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2383
interface))){
2384
if(strcmp(interface, "none") != 0
2385
and if_nametoindex(interface) == 0){
2386
if(interface[0] != '\0'){
2387
fprintf_plus(stderr, "Not using nonexisting interface"
2388
" \"%s\"\n", interface);
2389
}
2390
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2391
interface = NULL;
2392
}
2393
}
2394
}
2395
2396
/* Run network hooks */
2397
{
2398
if(mc.interfaces != NULL){
2399
interfaces_hooks = malloc(mc.interfaces_size);
2400
if(interfaces_hooks == NULL){
2401
perror_plus("malloc");
2402
goto end;
2403
}
2404
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2405
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2406
}
2407
run_network_hooks("start", interfaces_hooks != NULL ?
2408
interfaces_hooks : "", delay);
1121
2409
}
1122
2410
1123
2411
if(not debug){
1128
2416
from the signal handler */
1129
2417
/* Initialize the pseudo-RNG for Avahi */
1130
2418
srand((unsigned int) time(NULL));
1131
mc.simple_poll = avahi_simple_poll_new();
1132
if(mc.simple_poll == NULL){
1133
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1134
exitcode = EXIT_FAILURE;
2419
simple_poll = avahi_simple_poll_new();
2420
if(simple_poll == NULL){
2421
fprintf_plus(stderr,
2422
"Avahi: Failed to create simple poll object.\n");
2423
exitcode = EX_UNAVAILABLE;
1135
2424
goto end;
1136
2425
}
1137
2426
1138
2427
sigemptyset(&sigterm_action.sa_mask);
1139
2428
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1140
2429
if(ret == -1){
1141
perror("sigaddset");
1142
exitcode = EXIT_FAILURE;
2430
perror_plus("sigaddset");
2431
exitcode = EX_OSERR;
1143
2432
goto end;
1144
2433
}
1145
2434
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1146
2435
if(ret == -1){
1147
perror("sigaddset");
1148
exitcode = EXIT_FAILURE;
2436
perror_plus("sigaddset");
2437
exitcode = EX_OSERR;
1149
2438
goto end;
1150
2439
}
1151
2440
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1152
2441
if(ret == -1){
1153
perror("sigaddset");
1154
exitcode = EXIT_FAILURE;
2442
perror_plus("sigaddset");
2443
exitcode = EX_OSERR;
1155
2444
goto end;
1156
2445
}
1157
2446
/* Need to check if the handler is SIG_IGN before handling:
1160
2449
*/
1161
2450
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1162
2451
if(ret == -1){
1163
perror("sigaction");
1164
return EXIT_FAILURE;
2452
perror_plus("sigaction");
2453
return EX_OSERR;
1165
2454
}
1166
2455
if(old_sigterm_action.sa_handler != SIG_IGN){
1167
2456
ret = sigaction(SIGINT, &sigterm_action, NULL);
1168
2457
if(ret == -1){
1169
perror("sigaction");
1170
exitcode = EXIT_FAILURE;
2458
perror_plus("sigaction");
2459
exitcode = EX_OSERR;
1171
2460
goto end;
1172
2461
}
1173
2462
}
1174
2463
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1175
2464
if(ret == -1){
1176
perror("sigaction");
1177
return EXIT_FAILURE;
2465
perror_plus("sigaction");
2466
return EX_OSERR;
1178
2467
}
1179
2468
if(old_sigterm_action.sa_handler != SIG_IGN){
1180
2469
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1181
2470
if(ret == -1){
1182
perror("sigaction");
1183
exitcode = EXIT_FAILURE;
2471
perror_plus("sigaction");
2472
exitcode = EX_OSERR;
1184
2473
goto end;
1185
2474
}
1186
2475
}
1187
2476
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1188
2477
if(ret == -1){
1189
perror("sigaction");
1190
return EXIT_FAILURE;
2478
perror_plus("sigaction");
2479
return EX_OSERR;
1191
2480
}
1192
2481
if(old_sigterm_action.sa_handler != SIG_IGN){
1193
2482
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1194
2483
if(ret == -1){
1195
perror("sigaction");
1196
exitcode = EXIT_FAILURE;
1197
goto end;
1198
}
1199
}
1200
1201
/* If the interface is down, bring it up */
1202
if(interface[0] != '\0'){
1203
if_index = (AvahiIfIndex) if_nametoindex(interface);
1204
if(if_index == 0){
1205
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1206
exitcode = EXIT_FAILURE;
1207
goto end;
1208
}
1209
1210
if(quit_now){
1211
goto end;
1212
}
1213
1214
/* Re-raise priviliges */
1215
errno = 0;
1216
ret = seteuid(0);
1217
if(ret == -1){
1218
perror("seteuid");
1219
}
1220
1221
#ifdef __linux__
1222
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1223
messages to mess up the prompt */
1224
ret = klogctl(8, NULL, 5);
1225
bool restore_loglevel = true;
1226
if(ret == -1){
1227
restore_loglevel = false;
1228
perror("klogctl");
1229
}
1230
#endif /* __linux__ */
1231
1232
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1233
if(sd < 0){
1234
perror("socket");
1235
exitcode = EXIT_FAILURE;
1236
#ifdef __linux__
1237
if(restore_loglevel){
1238
ret = klogctl(7, NULL, 0);
1239
if(ret == -1){
1240
perror("klogctl");
1241
}
1242
}
1243
#endif /* __linux__ */
1244
/* Lower privileges */
1245
errno = 0;
1246
ret = seteuid(uid);
1247
if(ret == -1){
1248
perror("seteuid");
1249
}
1250
goto end;
1251
}
1252
strcpy(network.ifr_name, interface);
1253
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1254
if(ret == -1){
1255
perror("ioctl SIOCGIFFLAGS");
1256
#ifdef __linux__
1257
if(restore_loglevel){
1258
ret = klogctl(7, NULL, 0);
1259
if(ret == -1){
1260
perror("klogctl");
1261
}
1262
}
1263
#endif /* __linux__ */
1264
exitcode = EXIT_FAILURE;
1265
/* Lower privileges */
1266
errno = 0;
1267
ret = seteuid(uid);
1268
if(ret == -1){
1269
perror("seteuid");
1270
}
1271
goto end;
1272
}
1273
if((network.ifr_flags & IFF_UP) == 0){
1274
network.ifr_flags |= IFF_UP;
1275
take_down_interface = true;
1276
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1277
if(ret == -1){
1278
take_down_interface = false;
1279
perror("ioctl SIOCSIFFLAGS");
1280
exitcode = EXIT_FAILURE;
1281
#ifdef __linux__
1282
if(restore_loglevel){
1283
ret = klogctl(7, NULL, 0);
1284
if(ret == -1){
1285
perror("klogctl");
2484
perror_plus("sigaction");
2485
exitcode = EX_OSERR;
2486
goto end;
2487
}
2488
}
2489
2490
/* If no interfaces were specified, make a list */
2491
if(mc.interfaces == NULL){
2492
struct dirent **direntries = NULL;
2493
/* Look for any good interfaces */
2494
ret = scandir(sys_class_net, &direntries, good_interface,
2495
alphasort);
2496
if(ret >= 1){
2497
/* Add all found interfaces to interfaces list */
2498
for(int i = 0; i < ret; ++i){
2499
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2500
direntries[i]->d_name);
2501
if(ret_errno != 0){
2502
errno = ret_errno;
2503
perror_plus("argz_add");
2504
free(direntries[i]);
2505
continue;
2506
}
2507
if(debug){
2508
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2509
direntries[i]->d_name);
2510
}
2511
free(direntries[i]);
2512
}
2513
free(direntries);
2514
} else {
2515
if(ret == 0){
2516
free(direntries);
2517
}
2518
fprintf_plus(stderr, "Could not find a network interface\n");
2519
exitcode = EXIT_FAILURE;
2520
goto end;
2521
}
2522
}
2523
2524
/* Bring up interfaces which are down, and remove any "none"s */
2525
{
2526
char *interface = NULL;
2527
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2528
interface))){
2529
/* If interface name is "none", stop bringing up interfaces.
2530
Also remove all instances of "none" from the list */
2531
if(strcmp(interface, "none") == 0){
2532
argz_delete(&mc.interfaces, &mc.interfaces_size,
2533
interface);
2534
interface = NULL;
2535
while((interface = argz_next(mc.interfaces,
2536
mc.interfaces_size, interface))){
2537
if(strcmp(interface, "none") == 0){
2538
argz_delete(&mc.interfaces, &mc.interfaces_size,
2539
interface);
2540
interface = NULL;
1286
2541
}
1287
2542
}
1288
#endif /* __linux__ */
1289
/* Lower privileges */
1290
errno = 0;
1291
ret = seteuid(uid);
1292
if(ret == -1){
1293
perror("seteuid");
1294
}
1295
goto end;
1296
}
1297
}
1298
/* sleep checking until interface is running */
1299
for(int i=0; i < delay * 4; i++){
1300
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1301
if(ret == -1){
1302
perror("ioctl SIOCGIFFLAGS");
1303
} else if(network.ifr_flags & IFF_RUNNING){
1304
2543
break;
1305
2544
}
1306
struct timespec sleeptime = { .tv_nsec = 250000000 };
1307
ret = nanosleep(&sleeptime, NULL);
1308
if(ret == -1 and errno != EINTR){
1309
perror("nanosleep");
1310
}
1311
}
1312
if(not take_down_interface){
1313
/* We won't need the socket anymore */
1314
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1315
if(ret == -1){
1316
perror("close");
1317
}
1318
}
1319
#ifdef __linux__
1320
if(restore_loglevel){
1321
/* Restores kernel loglevel to default */
1322
ret = klogctl(7, NULL, 0);
1323
if(ret == -1){
1324
perror("klogctl");
1325
}
1326
}
1327
#endif /* __linux__ */
1328
/* Lower privileges */
1329
errno = 0;
1330
if(take_down_interface){
1331
/* Lower privileges */
1332
ret = seteuid(uid);
1333
if(ret == -1){
1334
perror("seteuid");
1335
}
1336
} else {
1337
/* Lower privileges permanently */
1338
ret = setuid(uid);
1339
if(ret == -1){
1340
perror("setuid");
1341
}
1342
}
2545
bool interface_was_up = interface_is_up(interface);
2546
errno = bring_up_interface(interface, delay);
2547
if(not interface_was_up){
2548
if(errno != 0){
2549
perror_plus("Failed to bring up interface");
2550
} else {
2551
errno = argz_add(&interfaces_to_take_down,
2552
&interfaces_to_take_down_size,
2553
interface);
2554
if(errno != 0){
2555
perror_plus("argz_add");
2556
}
2557
}
2558
}
2559
}
2560
if(debug and (interfaces_to_take_down == NULL)){
2561
fprintf_plus(stderr, "No interfaces were brought up\n");
2562
}
2563
}
2564
2565
/* If we only got one interface, explicitly use only that one */
2566
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2567
if(debug){
2568
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2569
mc.interfaces);
2570
}
2571
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1343
2572
}
1344
2573
1345
2574
if(quit_now){
1346
2575
goto end;
1347
2576
}
1348
2577
1349
ret = init_gnutls_global(pubkey, seckey);
2578
ret = init_gnutls_global(pubkey, seckey, &mc);
1350
2579
if(ret == -1){
1351
fprintf(stderr, "init_gnutls_global failed\n");
1352
exitcode = EXIT_FAILURE;
2580
fprintf_plus(stderr, "init_gnutls_global failed\n");
2581
exitcode = EX_UNAVAILABLE;
1353
2582
goto end;
1354
2583
} else {
1355
2584
gnutls_initialized = true;
1359
2588
goto end;
1360
2589
}
1361
2590
1362
tempdir_created = true;
1363
if(mkdtemp(tempdir) == NULL){
1364
tempdir_created = false;
1365
perror("mkdtemp");
2591
/* Try /run/tmp before /tmp */
2592
tempdir = mkdtemp(run_tempdir);
2593
if(tempdir == NULL and errno == ENOENT){
2594
if(debug){
2595
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2596
run_tempdir, old_tempdir);
2597
}
2598
tempdir = mkdtemp(old_tempdir);
2599
}
2600
if(tempdir == NULL){
2601
perror_plus("mkdtemp");
1366
2602
goto end;
1367
2603
}
1368
2604
1370
2606
goto end;
1371
2607
}
1372
2608
1373
if(not init_gpgme(pubkey, seckey, tempdir)){
1374
fprintf(stderr, "init_gpgme failed\n");
1375
exitcode = EXIT_FAILURE;
2609
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2610
fprintf_plus(stderr, "init_gpgme failed\n");
2611
exitcode = EX_UNAVAILABLE;
1376
2612
goto end;
1377
2613
} else {
1378
2614
gpgme_initialized = true;
1386
2622
/* Connect directly, do not use Zeroconf */
1387
2623
/* (Mainly meant for debugging) */
1388
2624
char *address = strrchr(connect_to, ':');
2625
1389
2626
if(address == NULL){
1390
fprintf(stderr, "No colon in address\n");
1391
exitcode = EXIT_FAILURE;
2627
fprintf_plus(stderr, "No colon in address\n");
2628
exitcode = EX_USAGE;
1392
2629
goto end;
1393
2630
}
1394
2631
1396
2633
goto end;
1397
2634
}
1398
2635
1399
uint16_t port;
2636
in_port_t port;
1400
2637
errno = 0;
1401
2638
tmpmax = strtoimax(address+1, &tmp, 10);
1402
2639
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1403
or tmpmax != (uint16_t)tmpmax){
1404
fprintf(stderr, "Bad port number\n");
1405
exitcode = EXIT_FAILURE;
2640
or tmpmax != (in_port_t)tmpmax){
2641
fprintf_plus(stderr, "Bad port number\n");
2642
exitcode = EX_USAGE;
1406
2643
goto end;
1407
2644
}
1408
2645
1409
2646
if(quit_now){
1410
2647
goto end;
1411
2648
}
1412
2649
1413
port = (uint16_t)tmpmax;
2650
port = (in_port_t)tmpmax;
1414
2651
*address = '\0';
1415
address = connect_to;
1416
2652
/* Colon in address indicates IPv6 */
1417
2653
int af;
1418
if(strchr(address, ':') != NULL){
2654
if(strchr(connect_to, ':') != NULL){
1419
2655
af = AF_INET6;
2656
/* Accept [] around IPv6 address - see RFC 5952 */
2657
if(connect_to[0] == '[' and address[-1] == ']')
2658
{
2659
connect_to++;
2660
address[-1] = '\0';
2661
}
1420
2662
} else {
1421
2663
af = AF_INET;
1422
2664
}
2665
address = connect_to;
1423
2666
1424
2667
if(quit_now){
1425
2668
goto end;
1426
2669
}
1427
2670
1428
ret = start_mandos_communication(address, port, if_index, af);
1429
if(ret < 0){
1430
exitcode = EXIT_FAILURE;
1431
} else {
2671
while(not quit_now){
2672
ret = start_mandos_communication(address, port, if_index, af,
2673
&mc);
2674
if(quit_now or ret == 0){
2675
break;
2676
}
2677
if(debug){
2678
fprintf_plus(stderr, "Retrying in %d seconds\n",
2679
(int)retry_interval);
2680
}
2681
sleep((unsigned int)retry_interval);
2682
}
2683
2684
if(not quit_now){
1432
2685
exitcode = EXIT_SUCCESS;
1433
2686
}
2687
1434
2688
goto end;
1435
2689
}
1436
2690
1448
2702
config.publish_domain = 0;
1449
2703
1450
2704
/* Allocate a new server */
1451
mc.server = avahi_server_new(avahi_simple_poll_get
1452
(mc.simple_poll), &config, NULL,
1453
NULL, &error);
2705
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2706
&config, NULL, NULL, &ret_errno);
1454
2707
1455
2708
/* Free the Avahi configuration data */
1456
2709
avahi_server_config_free(&config);
1458
2711
1459
2712
/* Check if creating the Avahi server object succeeded */
1460
2713
if(mc.server == NULL){
1461
fprintf(stderr, "Failed to create Avahi server: %s\n",
1462
avahi_strerror(error));
1463
exitcode = EXIT_FAILURE;
2714
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2715
avahi_strerror(ret_errno));
2716
exitcode = EX_UNAVAILABLE;
1464
2717
goto end;
1465
2718
}
1466
2719
1471
2724
/* Create the Avahi service browser */
1472
2725
sb = avahi_s_service_browser_new(mc.server, if_index,
1473
2726
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1474
NULL, 0, browse_callback, NULL);
2727
NULL, 0, browse_callback,
2728
(void *)&mc);
1475
2729
if(sb == NULL){
1476
fprintf(stderr, "Failed to create service browser: %s\n",
1477
avahi_strerror(avahi_server_errno(mc.server)));
1478
exitcode = EXIT_FAILURE;
2730
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2731
avahi_strerror(avahi_server_errno(mc.server)));
2732
exitcode = EX_UNAVAILABLE;
1479
2733
goto end;
1480
2734
}
1481
2735
1486
2740
/* Run the main loop */
1487
2741
1488
2742
if(debug){
1489
fprintf(stderr, "Starting Avahi loop search\n");
2743
fprintf_plus(stderr, "Starting Avahi loop search\n");
1490
2744
}
1491
2745
1492
avahi_simple_poll_loop(mc.simple_poll);
2746
ret = avahi_loop_with_timeout(simple_poll,
2747
(int)(retry_interval * 1000), &mc);
2748
if(debug){
2749
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2750
(ret == 0) ? "successfully" : "with error");
2751
}
1493
2752
1494
2753
end:
1495
2754
1496
2755
if(debug){
1497
fprintf(stderr, "%s exiting\n", argv[0]);
2756
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1498
2757
}
1499
2758
1500
2759
/* Cleanup things */
2760
free(mc.interfaces);
2761
1501
2762
if(sb != NULL)
1502
2763
avahi_s_service_browser_free(sb);
1503
2764
1504
2765
if(mc.server != NULL)
1505
2766
avahi_server_free(mc.server);
1506
2767
1507
if(mc.simple_poll != NULL)
1508
avahi_simple_poll_free(mc.simple_poll);
2768
if(simple_poll != NULL)
2769
avahi_simple_poll_free(simple_poll);
1509
2770
1510
2771
if(gnutls_initialized){
1511
2772
gnutls_certificate_free_credentials(mc.cred);
1517
2778
gpgme_release(mc.ctx);
1518
2779
}
1519
2780
1520
/* Take down the network interface */
1521
if(take_down_interface){
1522
/* Re-raise priviliges */
1523
errno = 0;
1524
ret = seteuid(0);
1525
if(ret == -1){
1526
perror("seteuid");
1527
}
1528
if(geteuid() == 0){
1529
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1530
if(ret == -1){
1531
perror("ioctl SIOCGIFFLAGS");
1532
} else if(network.ifr_flags & IFF_UP) {
1533
network.ifr_flags &= ~IFF_UP; /* clear flag */
1534
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1535
if(ret == -1){
1536
perror("ioctl SIOCSIFFLAGS");
1537
}
1538
}
1539
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1540
if(ret == -1){
1541
perror("close");
1542
}
1543
/* Lower privileges permanently */
1544
errno = 0;
1545
ret = setuid(uid);
1546
if(ret == -1){
1547
perror("setuid");
1548
}
1549
}
1550
}
1551
1552
/* Removes the temp directory used by GPGME */
1553
if(tempdir_created){
1554
DIR *d;
1555
struct dirent *direntry;
1556
d = opendir(tempdir);
1557
if(d == NULL){
1558
if(errno != ENOENT){
1559
perror("opendir");
1560
}
1561
} else {
1562
while(true){
1563
direntry = readdir(d);
1564
if(direntry == NULL){
1565
break;
1566
}
1567
/* Skip "." and ".." */
1568
if(direntry->d_name[0] == '.'
1569
and (direntry->d_name[1] == '\0'
1570
or (direntry->d_name[1] == '.'
1571
and direntry->d_name[2] == '\0'))){
1572
continue;
1573
}
1574
char *fullname = NULL;
1575
ret = asprintf(&fullname, "%s/%s", tempdir,
1576
direntry->d_name);
1577
if(ret < 0){
1578
perror("asprintf");
1579
continue;
1580
}
1581
ret = remove(fullname);
1582
if(ret == -1){
1583
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1584
strerror(errno));
1585
}
1586
free(fullname);
1587
}
1588
closedir(d);
1589
}
1590
ret = rmdir(tempdir);
1591
if(ret == -1 and errno != ENOENT){
1592
perror("rmdir");
2781
/* Cleans up the circular linked list of Mandos servers the client
2782
has seen */
2783
if(mc.current_server != NULL){
2784
mc.current_server->prev->next = NULL;
2785
while(mc.current_server != NULL){
2786
server *next = mc.current_server->next;
2787
#ifdef __GNUC__
2788
#pragma GCC diagnostic push
2789
#pragma GCC diagnostic ignored "-Wcast-qual"
2790
#endif
2791
free((char *)(mc.current_server->ip));
2792
#ifdef __GNUC__
2793
#pragma GCC diagnostic pop
2794
#endif
2795
free(mc.current_server);
2796
mc.current_server = next;
2797
}
2798
}
2799
2800
/* Re-raise privileges */
2801
{
2802
ret_errno = raise_privileges();
2803
if(ret_errno != 0){
2804
errno = ret_errno;
2805
perror_plus("Failed to raise privileges");
2806
} else {
2807
2808
/* Run network hooks */
2809
run_network_hooks("stop", interfaces_hooks != NULL ?
2810
interfaces_hooks : "", delay);
2811
2812
/* Take down the network interfaces which were brought up */
2813
{
2814
char *interface = NULL;
2815
while((interface=argz_next(interfaces_to_take_down,
2816
interfaces_to_take_down_size,
2817
interface))){
2818
ret_errno = take_down_interface(interface);
2819
if(ret_errno != 0){
2820
errno = ret_errno;
2821
perror_plus("Failed to take down interface");
2822
}
2823
}
2824
if(debug and (interfaces_to_take_down == NULL)){
2825
fprintf_plus(stderr, "No interfaces needed to be taken"
2826
" down\n");
2827
}
2828
}
2829
}
2830
2831
ret_errno = lower_privileges_permanently();
2832
if(ret_errno != 0){
2833
errno = ret_errno;
2834
perror_plus("Failed to lower privileges permanently");
2835
}
2836
}
2837
2838
free(interfaces_to_take_down);
2839
free(interfaces_hooks);
2840
2841
/* Removes the GPGME temp directory and all files inside */
2842
if(tempdir != NULL){
2843
struct dirent **direntries = NULL;
2844
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
2845
| O_NOFOLLOW
2846
| O_DIRECTORY
2847
| O_PATH));
2848
if(tempdir_fd == -1){
2849
perror_plus("open");
2850
} else {
2851
#ifdef __GLIBC__
2852
#if __GLIBC_PREREQ(2, 15)
2853
int numentries = scandirat(tempdir_fd, ".", &direntries,
2854
notdotentries, alphasort);
2855
#else /* not __GLIBC_PREREQ(2, 15) */
2856
int numentries = scandir(tempdir, &direntries, notdotentries,
2857
alphasort);
2858
#endif /* not __GLIBC_PREREQ(2, 15) */
2859
#else /* not __GLIBC__ */
2860
int numentries = scandir(tempdir, &direntries, notdotentries,
2861
alphasort);
2862
#endif /* not __GLIBC__ */
2863
if(numentries >= 0){
2864
for(int i = 0; i < numentries; i++){
2865
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2866
if(ret == -1){
2867
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2868
" \"%s\", 0): %s\n", tempdir,
2869
direntries[i]->d_name, strerror(errno));
2870
}
2871
free(direntries[i]);
2872
}
2873
2874
/* need to clean even if 0 because man page doesn't specify */
2875
free(direntries);
2876
if(numentries == -1){
2877
perror_plus("scandir");
2878
}
2879
ret = rmdir(tempdir);
2880
if(ret == -1 and errno != ENOENT){
2881
perror_plus("rmdir");
2882
}
2883
}
2884
TEMP_FAILURE_RETRY(close(tempdir_fd));
1593
2885
}
1594
2886
}
1595
2887
1600
2892
&old_sigterm_action,
1601
2893
NULL));
1602
2894
if(ret == -1){
1603
perror("sigaction");
2895
perror_plus("sigaction");
1604
2896
}
1605
2897
do {
1606
2898
ret = raise(signal_received);
1607
2899
} while(ret != 0 and errno == EINTR);
1608
2900
if(ret != 0){
1609
perror("raise");
2901
perror_plus("raise");
1610
2902
abort();
1611
2903
}
1612
2904
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0