102
137
#define BUFFER_SIZE 256
105
#define PATHDIR "/conf/conf.d/mandos"
108
139
#define PATHDIR "/conf/conf.d/mandos"
109
140
#define SECKEY "seckey.txt"
110
#define PUBKEY "pupkey.txt"
141
#define PUBKEY "pubkey.txt"
142
#define HOOKDIR "/lib/mandos/network-hooks.d"
112
144
bool debug = false;
113
145
static const char mandos_protocol_version[] = "1";
114
const char *argp_program_version = "password-request 1.0";
115
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
146
const char *argp_program_version = "mandos-client " VERSION;
147
const char *argp_program_bug_address = "<mandos@recompile.se>";
148
static const char sys_class_net[] = "/sys/class/net";
149
char *connect_to = NULL;
150
const char *hookdir = HOOKDIR;
155
/* Doubly linked list that need to be circularly linked when used */
156
typedef struct server{
159
AvahiIfIndex if_index;
161
struct timespec last_seen;
117
166
/* Used for passing in values through the Avahi callback functions */
119
AvahiSimplePoll *simple_poll;
120
168
AvahiServer *server;
121
169
gnutls_certificate_credentials_t cred;
122
170
unsigned int dh_bits;
123
171
gnutls_dh_params_t dh_params;
124
172
const char *priority;
174
server *current_server;
176
size_t interfaces_size;
126
177
} mandos_context;
179
/* global so signal handler can reach it*/
180
AvahiSimplePoll *simple_poll;
182
sig_atomic_t quit_now = 0;
183
int signal_received = 0;
185
/* Function to use when printing errors */
186
void perror_plus(const char *print_text){
188
fprintf(stderr, "Mandos plugin %s: ",
189
program_invocation_short_name);
194
__attribute__((format (gnu_printf, 2, 3), nonnull))
195
int fprintf_plus(FILE *stream, const char *format, ...){
197
va_start (ap, format);
199
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
200
program_invocation_short_name));
201
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
129
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
130
* "buffer_capacity" is how much is currently allocated,
205
* Make additional room in "buffer" for at least BUFFER_SIZE more
206
* bytes. "buffer_capacity" is how much is currently allocated,
131
207
* "buffer_length" is how much is already used.
133
size_t adjustbuffer(char **buffer, size_t buffer_length,
134
size_t buffer_capacity){
135
if (buffer_length + BUFFER_SIZE > buffer_capacity){
136
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
209
__attribute__((nonnull, warn_unused_result))
210
size_t incbuffer(char **buffer, size_t buffer_length,
211
size_t buffer_capacity){
212
if(buffer_length + BUFFER_SIZE > buffer_capacity){
213
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
215
int old_errno = errno;
140
222
buffer_capacity += BUFFER_SIZE;
142
224
return buffer_capacity;
227
/* Add server to set of servers to retry periodically */
228
__attribute__((nonnull, warn_unused_result))
229
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
230
int af, server **current_server){
232
server *new_server = malloc(sizeof(server));
233
if(new_server == NULL){
234
perror_plus("malloc");
237
*new_server = (server){ .ip = strdup(ip),
239
.if_index = if_index,
241
if(new_server->ip == NULL){
242
perror_plus("strdup");
246
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
248
perror_plus("clock_gettime");
250
#pragma GCC diagnostic push
251
#pragma GCC diagnostic ignored "-Wcast-qual"
253
free((char *)(new_server->ip));
255
#pragma GCC diagnostic pop
260
/* Special case of first server */
261
if(*current_server == NULL){
262
new_server->next = new_server;
263
new_server->prev = new_server;
264
*current_server = new_server;
266
/* Place the new server last in the list */
267
new_server->next = *current_server;
268
new_server->prev = (*current_server)->prev;
269
new_server->prev->next = new_server;
270
(*current_server)->prev = new_server;
146
276
* Initialize GPGME.
148
static bool init_gpgme(mandos_context *mc, const char *seckey,
149
const char *pubkey, const char *tempdir){
278
__attribute__((nonnull, warn_unused_result))
279
static bool init_gpgme(const char * const seckey,
280
const char * const pubkey,
281
const char * const tempdir,
151
283
gpgme_error_t rc;
152
284
gpgme_engine_info_t engine_info;
156
* Helper function to insert pub and seckey to the enigne keyring.
287
* Helper function to insert pub and seckey to the engine keyring.
158
bool import_key(const char *filename){
289
bool import_key(const char * const filename){
160
292
gpgme_data_t pgp_data;
162
fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
294
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
168
300
rc = gpgme_data_new_from_fd(&pgp_data, fd);
169
if (rc != GPG_ERR_NO_ERROR){
170
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
171
gpgme_strsource(rc), gpgme_strerror(rc));
301
if(rc != GPG_ERR_NO_ERROR){
302
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
303
gpgme_strsource(rc), gpgme_strerror(rc));
175
307
rc = gpgme_op_import(mc->ctx, pgp_data);
176
if (rc != GPG_ERR_NO_ERROR){
177
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
178
gpgme_strsource(rc), gpgme_strerror(rc));
308
if(rc != GPG_ERR_NO_ERROR){
309
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
310
gpgme_strsource(rc), gpgme_strerror(rc));
182
ret = TEMP_FAILURE_RETRY(close(fd));
314
gpgme_import_result_t import_result
315
= gpgme_op_import_result(mc->ctx);
316
if((import_result->imported < 1
317
or import_result->not_imported > 0)
318
and import_result->unchanged == 0){
319
fprintf_plus(stderr, "bad gpgme_op_import_results:\n");
321
"The total number of considered keys: %d\n",
322
import_result->considered);
324
"The number of keys without user ID: %d\n",
325
import_result->no_user_id);
327
"The total number of imported keys: %d\n",
328
import_result->imported);
329
fprintf_plus(stderr, "The number of imported RSA keys: %d\n",
330
import_result->imported_rsa);
331
fprintf_plus(stderr, "The number of unchanged keys: %d\n",
332
import_result->unchanged);
333
fprintf_plus(stderr, "The number of new user IDs: %d\n",
334
import_result->new_user_ids);
335
fprintf_plus(stderr, "The number of new sub keys: %d\n",
336
import_result->new_sub_keys);
337
fprintf_plus(stderr, "The number of new signatures: %d\n",
338
import_result->new_signatures);
339
fprintf_plus(stderr, "The number of new revocations: %d\n",
340
import_result->new_revocations);
342
"The total number of secret keys read: %d\n",
343
import_result->secret_read);
345
"The number of imported secret keys: %d\n",
346
import_result->secret_imported);
348
"The number of unchanged secret keys: %d\n",
349
import_result->secret_unchanged);
350
fprintf_plus(stderr, "The number of keys not imported: %d\n",
351
import_result->not_imported);
352
for(gpgme_import_status_t import_status
353
= import_result->imports;
354
import_status != NULL;
355
import_status = import_status->next){
356
fprintf_plus(stderr, "Import status for key: %s\n",
358
if(import_status->result != GPG_ERR_NO_ERROR){
359
fprintf_plus(stderr, "Import result: %s: %s\n",
360
gpgme_strsource(import_status->result),
361
gpgme_strerror(import_status->result));
363
fprintf_plus(stderr, "Key status:\n");
365
import_status->status & GPGME_IMPORT_NEW
366
? "The key was new.\n"
367
: "The key was not new.\n");
369
import_status->status & GPGME_IMPORT_UID
370
? "The key contained new user IDs.\n"
371
: "The key did not contain new user IDs.\n");
373
import_status->status & GPGME_IMPORT_SIG
374
? "The key contained new signatures.\n"
375
: "The key did not contain new signatures.\n");
377
import_status->status & GPGME_IMPORT_SUBKEY
378
? "The key contained new sub keys.\n"
379
: "The key did not contain new sub keys.\n");
381
import_status->status & GPGME_IMPORT_SECRET
382
? "The key contained a secret key.\n"
383
: "The key did not contain a secret key.\n");
391
perror_plus("close");
186
393
gpgme_data_release(pgp_data);
191
fprintf(stderr, "Initialize gpgme\n");
398
fprintf_plus(stderr, "Initializing GPGME\n");
195
402
gpgme_check_version(NULL);
196
403
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
197
if (rc != GPG_ERR_NO_ERROR){
198
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
199
gpgme_strsource(rc), gpgme_strerror(rc));
404
if(rc != GPG_ERR_NO_ERROR){
405
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
406
gpgme_strsource(rc), gpgme_strerror(rc));
203
/* Set GPGME home directory for the OpenPGP engine only */
204
rc = gpgme_get_engine_info (&engine_info);
205
if (rc != GPG_ERR_NO_ERROR){
206
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
207
gpgme_strsource(rc), gpgme_strerror(rc));
410
/* Set GPGME home directory for the OpenPGP engine only */
411
rc = gpgme_get_engine_info(&engine_info);
412
if(rc != GPG_ERR_NO_ERROR){
413
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
414
gpgme_strsource(rc), gpgme_strerror(rc));
210
417
while(engine_info != NULL){
498
897
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
499
898
__attribute__((unused)) const char *txt){}
900
/* Set effective uid to 0, return errno */
901
__attribute__((warn_unused_result))
902
int raise_privileges(void){
903
int old_errno = errno;
905
if(seteuid(0) == -1){
912
/* Set effective and real user ID to 0. Return errno. */
913
__attribute__((warn_unused_result))
914
int raise_privileges_permanently(void){
915
int old_errno = errno;
916
int ret = raise_privileges();
928
/* Set effective user ID to unprivileged saved user ID */
929
__attribute__((warn_unused_result))
930
int lower_privileges(void){
931
int old_errno = errno;
933
if(seteuid(uid) == -1){
940
/* Lower privileges permanently */
941
__attribute__((warn_unused_result))
942
int lower_privileges_permanently(void){
943
int old_errno = errno;
945
if(setuid(uid) == -1){
952
/* Helper function to add_local_route() and delete_local_route() */
953
__attribute__((nonnull, warn_unused_result))
954
static bool add_delete_local_route(const bool add,
956
AvahiIfIndex if_index){
958
char helper[] = "mandos-client-iprouteadddel";
959
char add_arg[] = "add";
960
char delete_arg[] = "delete";
961
char debug_flag[] = "--debug";
962
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
963
if(pluginhelperdir == NULL){
965
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
966
" variable not set; cannot run helper\n");
971
char interface[IF_NAMESIZE];
972
if(if_indextoname((unsigned int)if_index, interface) == NULL){
973
perror_plus("if_indextoname");
977
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
979
perror_plus("open(\"/dev/null\", O_RDONLY)");
985
/* Raise privileges */
986
errno = raise_privileges_permanently();
988
perror_plus("Failed to raise privileges");
989
/* _exit(EX_NOPERM); */
995
perror_plus("setgid");
998
/* Reset supplementary groups */
1000
ret = setgroups(0, NULL);
1002
perror_plus("setgroups");
1006
ret = dup2(devnull, STDIN_FILENO);
1008
perror_plus("dup2(devnull, STDIN_FILENO)");
1011
ret = close(devnull);
1013
perror_plus("close");
1016
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1018
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1021
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
1026
if(helperdir_fd == -1){
1027
perror_plus("open");
1028
_exit(EX_UNAVAILABLE);
1030
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
1032
if(helper_fd == -1){
1033
perror_plus("openat");
1034
close(helperdir_fd);
1035
_exit(EX_UNAVAILABLE);
1037
close(helperdir_fd);
1039
#pragma GCC diagnostic push
1040
#pragma GCC diagnostic ignored "-Wcast-qual"
1042
if(fexecve(helper_fd, (char *const [])
1043
{ helper, add ? add_arg : delete_arg, (char *)address,
1044
interface, debug ? debug_flag : NULL, NULL },
1047
#pragma GCC diagnostic pop
1049
perror_plus("fexecve");
1050
_exit(EXIT_FAILURE);
1054
perror_plus("fork");
1061
pret = waitpid(pid, &status, 0);
1062
if(pret == -1 and errno == EINTR and quit_now){
1063
int errno_raising = 0;
1064
if((errno = raise_privileges()) != 0){
1065
errno_raising = errno;
1066
perror_plus("Failed to raise privileges in order to"
1067
" kill helper program");
1069
if(kill(pid, SIGTERM) == -1){
1070
perror_plus("kill");
1072
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1073
perror_plus("Failed to lower privileges after killing"
1078
} while(pret == -1 and errno == EINTR);
1080
perror_plus("waitpid");
1083
if(WIFEXITED(status)){
1084
if(WEXITSTATUS(status) != 0){
1085
fprintf_plus(stderr, "Error: iprouteadddel exited"
1086
" with status %d\n", WEXITSTATUS(status));
1091
if(WIFSIGNALED(status)){
1092
fprintf_plus(stderr, "Error: iprouteadddel died by"
1093
" signal %d\n", WTERMSIG(status));
1096
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1100
__attribute__((nonnull, warn_unused_result))
1101
static bool add_local_route(const char *address,
1102
AvahiIfIndex if_index){
1104
fprintf_plus(stderr, "Adding route to %s\n", address);
1106
return add_delete_local_route(true, address, if_index);
1109
__attribute__((nonnull, warn_unused_result))
1110
static bool delete_local_route(const char *address,
1111
AvahiIfIndex if_index){
1113
fprintf_plus(stderr, "Removing route to %s\n", address);
1115
return add_delete_local_route(false, address, if_index);
501
1118
/* Called when a Mandos server is found */
502
static int start_mandos_communication(const char *ip, uint16_t port,
1119
__attribute__((nonnull, warn_unused_result))
1120
static int start_mandos_communication(const char *ip, in_port_t port,
503
1121
AvahiIfIndex if_index,
506
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
1122
int af, mandos_context *mc){
1123
int ret, tcp_sd = -1;
1125
struct sockaddr_storage to;
507
1126
char *buffer = NULL;
508
char *decrypted_buffer;
1127
char *decrypted_buffer = NULL;
509
1128
size_t buffer_length = 0;
510
1129
size_t buffer_capacity = 0;
511
ssize_t decrypted_buffer_size;
514
char interface[IF_NAMESIZE];
515
1132
gnutls_session_t session;
517
ret = init_gnutls_session (mc, &session);
523
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
527
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
534
if(if_indextoname((unsigned int)if_index, interface) == NULL){
535
perror("if_indextoname");
1133
int pf; /* Protocol family */
1134
bool route_added = false;
1151
fprintf_plus(stderr, "Bad address family: %d\n", af);
1156
/* If the interface is specified and we have a list of interfaces */
1157
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1158
/* Check if the interface is one of the interfaces we are using */
1161
char *interface = NULL;
1162
while((interface = argz_next(mc->interfaces,
1163
mc->interfaces_size,
1165
if(if_nametoindex(interface) == (unsigned int)if_index){
1172
/* This interface does not match any in the list, so we don't
1173
connect to the server */
1175
char interface[IF_NAMESIZE];
1176
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1177
perror_plus("if_indextoname");
1179
fprintf_plus(stderr, "Skipping server on non-used interface"
1181
if_indextoname((unsigned int)if_index,
538
fprintf(stderr, "Binding to interface %s\n", interface);
541
memset(&to, 0, sizeof(to));
542
to.in6.sin6_family = AF_INET6;
543
/* It would be nice to have a way to detect if we were passed an
544
IPv4 address here. Now we assume an IPv6 address. */
545
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
1189
ret = init_gnutls_session(&session, mc);
1195
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1196
PRIuMAX "\n", ip, (uintmax_t)port);
1199
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
1202
perror_plus("socket");
1213
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1214
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1215
ret = inet_pton(af, ip, &to6->sin6_addr);
1217
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1218
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1219
ret = inet_pton(af, ip, &to4->sin_addr);
1223
perror_plus("inet_pton");
551
fprintf(stderr, "Bad address: %s\n", ip);
554
to.in6.sin6_port = htons(port); /* Spurious warning */
1229
fprintf_plus(stderr, "Bad address: %s\n", ip);
1234
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1235
if(IN6_IS_ADDR_LINKLOCAL
1236
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
1237
if(if_index == AVAHI_IF_UNSPEC){
1238
fprintf_plus(stderr, "An IPv6 link-local address is"
1239
" incomplete without a network interface\n");
1243
/* Set the network interface number as scope */
1244
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
1247
((struct sockaddr_in *)&to)->sin_port = htons(port);
556
to.in6.sin6_scope_id = (uint32_t)if_index;
559
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
561
char addrstr[INET6_ADDRSTRLEN] = "";
562
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
563
sizeof(addrstr)) == NULL){
566
if(strcmp(addrstr, ip) != 0){
567
fprintf(stderr, "Canonical address form: %s\n", addrstr);
572
ret = connect(tcp_sd, &to.in, sizeof(to));
1256
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
1257
char interface[IF_NAMESIZE];
1258
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1259
perror_plus("if_indextoname");
1261
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1262
"\n", ip, interface, (uintmax_t)port);
1265
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1266
ip, (uintmax_t)port);
1268
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1269
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1271
ret = getnameinfo((struct sockaddr *)&to,
1272
sizeof(struct sockaddr_in6),
1273
addrstr, sizeof(addrstr), NULL, 0,
1276
ret = getnameinfo((struct sockaddr *)&to,
1277
sizeof(struct sockaddr_in),
1278
addrstr, sizeof(addrstr), NULL, 0,
1281
if(ret == EAI_SYSTEM){
1282
perror_plus("getnameinfo");
1283
} else if(ret != 0) {
1284
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1285
} else if(strcmp(addrstr, ip) != 0){
1286
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1297
ret = connect(tcp_sd, (struct sockaddr *)&to,
1298
sizeof(struct sockaddr_in6));
1300
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1301
sizeof(struct sockaddr_in));
1304
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1305
and if_index != AVAHI_IF_UNSPEC
1306
and connect_to == NULL
1307
and not route_added and
1308
((af == AF_INET6 and not
1309
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1311
or (af == AF_INET and
1312
/* Not a a IPv4LL address */
1313
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1314
& 0xFFFF0000L) != 0xA9FE0000L))){
1315
/* Work around Avahi bug - Avahi does not announce link-local
1316
addresses if it has a global address, so local hosts with
1317
*only* a link-local address (e.g. Mandos clients) cannot
1318
connect to a Mandos server announced by Avahi on a server
1319
host with a global address. Work around this by retrying
1320
with an explicit route added with the server's address.
1322
Avahi bug reference:
1323
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1324
https://bugs.debian.org/587961
1327
fprintf_plus(stderr, "Mandos server unreachable, trying"
1331
route_added = add_local_route(ip, if_index);
1337
if(errno != ECONNREFUSED or debug){
1339
perror_plus("connect");
578
1352
const char *out = mandos_protocol_version;
581
1355
size_t out_size = strlen(out);
582
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
583
out_size - written));
1356
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
1357
out_size - written));
1360
perror_plus("write");
587
1362
goto mandos_end;
589
1364
written += (size_t)ret;
590
1365
if(written < out_size){
593
if (out == mandos_protocol_version){
1368
if(out == mandos_protocol_version){
603
fprintf(stderr, "Establishing TLS session with %s\n", ip);
606
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
609
ret = gnutls_handshake (session);
1383
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
1391
/* This casting via intptr_t is to eliminate warning about casting
1392
an int to a pointer type. This is exactly how the GnuTLS Guile
1393
function "set-session-transport-fd!" does it. */
1394
gnutls_transport_set_ptr(session,
1395
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
1403
ret = gnutls_handshake(session);
610
1408
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
612
if (ret != GNUTLS_E_SUCCESS){
1410
if(ret != GNUTLS_E_SUCCESS){
614
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1412
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
618
1416
goto mandos_end;
621
1419
/* Read OpenPGP packet that contains the wanted password */
624
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
1422
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
629
buffer_capacity = adjustbuffer(&buffer, buffer_length,
631
if (buffer_capacity == 0){
632
perror("adjustbuffer");
637
ret = gnutls_record_recv(session, buffer+buffer_length,
1433
buffer_capacity = incbuffer(&buffer, buffer_length,
1435
if(buffer_capacity == 0){
1437
perror_plus("incbuffer");
1447
sret = gnutls_record_recv(session, buffer+buffer_length,
644
1454
case GNUTLS_E_INTERRUPTED:
645
1455
case GNUTLS_E_AGAIN:
647
1457
case GNUTLS_E_REHANDSHAKE:
649
ret = gnutls_handshake (session);
1459
ret = gnutls_handshake(session);
650
1465
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
652
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1467
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
655
1471
goto mandos_end;
659
fprintf(stderr, "Unknown error while reading data from"
660
" encrypted session with Mandos server\n");
662
gnutls_bye (session, GNUTLS_SHUT_RDWR);
1475
fprintf_plus(stderr, "Unknown error while reading data from"
1476
" encrypted session with Mandos server\n");
1477
gnutls_bye(session, GNUTLS_SHUT_RDWR);
663
1479
goto mandos_end;
666
buffer_length += (size_t) ret;
1482
buffer_length += (size_t) sret;
671
fprintf(stderr, "Closing TLS session\n");
674
gnutls_bye (session, GNUTLS_SHUT_RDWR);
676
if (buffer_length > 0){
677
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
680
if (decrypted_buffer_size >= 0){
1487
fprintf_plus(stderr, "Closing TLS session\n");
1496
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
1501
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1503
if(buffer_length > 0){
1504
ssize_t decrypted_buffer_size;
1505
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1506
&decrypted_buffer, mc);
1507
if(decrypted_buffer_size >= 0){
682
1511
while(written < (size_t) decrypted_buffer_size){
683
ret = (int)fwrite (decrypted_buffer + written, 1,
684
(size_t)decrypted_buffer_size - written,
1517
ret = (int)fwrite(decrypted_buffer + written, 1,
1518
(size_t)decrypted_buffer_size - written,
686
1520
if(ret == 0 and ferror(stdout)){
688
fprintf(stderr, "Error writing encrypted data: %s\n",
1523
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
694
1529
written += (size_t)ret;
696
free(decrypted_buffer);
1531
ret = fflush(stdout);
1535
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
704
1545
/* Shutdown procedure */
708
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
1550
if(not delete_local_route(ip, if_index)){
1551
fprintf_plus(stderr, "Failed to delete local route to %s on"
1552
" interface %d", ip, if_index);
1556
free(decrypted_buffer);
1559
ret = close(tcp_sd);
1565
perror_plus("close");
1567
gnutls_deinit(session);
712
gnutls_deinit (session);
716
1577
static void resolve_callback(AvahiSServiceResolver *r,
717
1578
AvahiIfIndex interface,
718
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1579
AvahiProtocol proto,
719
1580
AvahiResolverEvent event,
720
1581
const char *name,
721
1582
const char *type,
804
1691
case AVAHI_BROWSER_ALL_FOR_NOW:
805
1692
case AVAHI_BROWSER_CACHE_EXHAUSTED:
807
fprintf(stderr, "No Mandos server found, still searching...\n");
1694
fprintf_plus(stderr, "No Mandos server found, still"
1701
/* Signal handler that stops main loop after SIGTERM */
1702
static void handle_sigterm(int sig){
1707
signal_received = sig;
1708
int old_errno = errno;
1709
/* set main loop to exit */
1710
if(simple_poll != NULL){
1711
avahi_simple_poll_quit(simple_poll);
1716
__attribute__((nonnull, warn_unused_result))
1717
bool get_flags(const char *ifname, struct ifreq *ifr){
1721
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1724
perror_plus("socket");
1728
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1729
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1730
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1734
perror_plus("ioctl SIOCGIFFLAGS");
1737
if((close(s) == -1) and debug){
1739
perror_plus("close");
1744
if((close(s) == -1) and debug){
1746
perror_plus("close");
1752
__attribute__((nonnull, warn_unused_result))
1753
bool good_flags(const char *ifname, const struct ifreq *ifr){
1755
/* Reject the loopback device */
1756
if(ifr->ifr_flags & IFF_LOOPBACK){
1758
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1763
/* Accept point-to-point devices only if connect_to is specified */
1764
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1766
fprintf_plus(stderr, "Accepting point-to-point interface"
1767
" \"%s\"\n", ifname);
1771
/* Otherwise, reject non-broadcast-capable devices */
1772
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1774
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1775
" \"%s\"\n", ifname);
1779
/* Reject non-ARP interfaces (including dummy interfaces) */
1780
if(ifr->ifr_flags & IFF_NOARP){
1782
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1788
/* Accept this device */
1790
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1796
* This function determines if a directory entry in /sys/class/net
1797
* corresponds to an acceptable network device.
1798
* (This function is passed to scandir(3) as a filter function.)
1800
__attribute__((nonnull, warn_unused_result))
1801
int good_interface(const struct dirent *if_entry){
1802
if(if_entry->d_name[0] == '.'){
1807
if(not get_flags(if_entry->d_name, &ifr)){
1809
fprintf_plus(stderr, "Failed to get flags for interface "
1810
"\"%s\"\n", if_entry->d_name);
1815
if(not good_flags(if_entry->d_name, &ifr)){
1822
* This function determines if a network interface is up.
1824
__attribute__((nonnull, warn_unused_result))
1825
bool interface_is_up(const char *interface){
1827
if(not get_flags(interface, &ifr)){
1829
fprintf_plus(stderr, "Failed to get flags for interface "
1830
"\"%s\"\n", interface);
1835
return (bool)(ifr.ifr_flags & IFF_UP);
1839
* This function determines if a network interface is running
1841
__attribute__((nonnull, warn_unused_result))
1842
bool interface_is_running(const char *interface){
1844
if(not get_flags(interface, &ifr)){
1846
fprintf_plus(stderr, "Failed to get flags for interface "
1847
"\"%s\"\n", interface);
1852
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1855
__attribute__((nonnull, pure, warn_unused_result))
1856
int notdotentries(const struct dirent *direntry){
1857
/* Skip "." and ".." */
1858
if(direntry->d_name[0] == '.'
1859
and (direntry->d_name[1] == '\0'
1860
or (direntry->d_name[1] == '.'
1861
and direntry->d_name[2] == '\0'))){
1867
/* Is this directory entry a runnable program? */
1868
__attribute__((nonnull, warn_unused_result))
1869
int runnable_hook(const struct dirent *direntry){
1874
if((direntry->d_name)[0] == '\0'){
1879
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1880
"abcdefghijklmnopqrstuvwxyz"
1883
if((direntry->d_name)[sret] != '\0'){
1884
/* Contains non-allowed characters */
1886
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1892
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1895
perror_plus("Could not stat hook");
1899
if(not (S_ISREG(st.st_mode))){
1900
/* Not a regular file */
1902
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1907
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1908
/* Not executable */
1910
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1916
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1922
__attribute__((nonnull, warn_unused_result))
1923
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1924
mandos_context *mc){
1926
struct timespec now;
1927
struct timespec waited_time;
1928
intmax_t block_time;
1931
if(mc->current_server == NULL){
1933
fprintf_plus(stderr, "Wait until first server is found."
1936
ret = avahi_simple_poll_iterate(s, -1);
1939
fprintf_plus(stderr, "Check current_server if we should run"
1942
/* the current time */
1943
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1945
perror_plus("clock_gettime");
1948
/* Calculating in ms how long time between now and server
1949
who we visted longest time ago. Now - last seen. */
1950
waited_time.tv_sec = (now.tv_sec
1951
- mc->current_server->last_seen.tv_sec);
1952
waited_time.tv_nsec = (now.tv_nsec
1953
- mc->current_server->last_seen.tv_nsec);
1954
/* total time is 10s/10,000ms.
1955
Converting to s from ms by dividing by 1,000,
1956
and ns to ms by dividing by 1,000,000. */
1957
block_time = ((retry_interval
1958
- ((intmax_t)waited_time.tv_sec * 1000))
1959
- ((intmax_t)waited_time.tv_nsec / 1000000));
1962
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1966
if(block_time <= 0){
1967
ret = start_mandos_communication(mc->current_server->ip,
1968
mc->current_server->port,
1969
mc->current_server->if_index,
1970
mc->current_server->af, mc);
1972
avahi_simple_poll_quit(s);
1975
ret = clock_gettime(CLOCK_MONOTONIC,
1976
&mc->current_server->last_seen);
1978
perror_plus("clock_gettime");
1981
mc->current_server = mc->current_server->next;
1982
block_time = 0; /* Call avahi to find new Mandos
1983
servers, but don't block */
1986
ret = avahi_simple_poll_iterate(s, (int)block_time);
1989
if(ret > 0 or errno != EINTR){
1990
return (ret != 1) ? ret : 0;
1996
__attribute__((nonnull))
1997
void run_network_hooks(const char *mode, const char *interface,
1999
struct dirent **direntries = NULL;
2000
if(hookdir_fd == -1){
2001
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
2003
if(hookdir_fd == -1){
2004
if(errno == ENOENT){
2006
fprintf_plus(stderr, "Network hook directory \"%s\" not"
2007
" found\n", hookdir);
2010
perror_plus("open");
2015
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2017
perror_plus("open(\"/dev/null\", O_RDONLY)");
2020
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2021
runnable_hook, alphasort);
2023
perror_plus("scandir");
2027
struct dirent *direntry;
2029
for(int i = 0; i < numhooks; i++){
2030
direntry = direntries[i];
2032
fprintf_plus(stderr, "Running network hook \"%s\"\n",
2035
pid_t hook_pid = fork();
2038
/* Raise privileges */
2039
errno = raise_privileges_permanently();
2041
perror_plus("Failed to raise privileges");
2048
perror_plus("setgid");
2051
/* Reset supplementary groups */
2053
ret = setgroups(0, NULL);
2055
perror_plus("setgroups");
2058
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2060
perror_plus("setenv");
2063
ret = setenv("DEVICE", interface, 1);
2065
perror_plus("setenv");
2068
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
2070
perror_plus("setenv");
2073
ret = setenv("MODE", mode, 1);
2075
perror_plus("setenv");
2079
ret = asprintf(&delaystring, "%f", (double)delay);
2081
perror_plus("asprintf");
2084
ret = setenv("DELAY", delaystring, 1);
2087
perror_plus("setenv");
2091
if(connect_to != NULL){
2092
ret = setenv("CONNECT", connect_to, 1);
2094
perror_plus("setenv");
2098
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2102
perror_plus("openat");
2103
_exit(EXIT_FAILURE);
2105
if(close(hookdir_fd) == -1){
2106
perror_plus("close");
2107
_exit(EXIT_FAILURE);
2109
ret = dup2(devnull, STDIN_FILENO);
2111
perror_plus("dup2(devnull, STDIN_FILENO)");
2114
ret = close(devnull);
2116
perror_plus("close");
2119
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2121
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2124
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2126
perror_plus("fexecve");
2127
_exit(EXIT_FAILURE);
2131
perror_plus("fork");
2136
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2137
perror_plus("waitpid");
2141
if(WIFEXITED(status)){
2142
if(WEXITSTATUS(status) != 0){
2143
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2144
" with status %d\n", direntry->d_name,
2145
WEXITSTATUS(status));
2149
} else if(WIFSIGNALED(status)){
2150
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2151
" signal %d\n", direntry->d_name,
2156
fprintf_plus(stderr, "Warning: network hook \"%s\""
2157
" crashed\n", direntry->d_name);
2163
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2169
if(close(hookdir_fd) == -1){
2170
perror_plus("close");
2177
__attribute__((nonnull, warn_unused_result))
2178
int bring_up_interface(const char *const interface,
2180
int old_errno = errno;
2182
struct ifreq network;
2183
unsigned int if_index = if_nametoindex(interface);
2185
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2195
if(not interface_is_up(interface)){
2197
int ioctl_errno = 0;
2198
if(not get_flags(interface, &network)){
2200
fprintf_plus(stderr, "Failed to get flags for interface "
2201
"\"%s\"\n", interface);
2205
network.ifr_flags |= IFF_UP; /* set flag */
2207
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2210
perror_plus("socket");
2218
perror_plus("close");
2225
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2229
/* Raise privileges */
2230
ret_errno = raise_privileges();
2233
perror_plus("Failed to raise privileges");
2238
bool restore_loglevel = false;
2240
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2241
messages about the network interface to mess up the prompt */
2242
ret_linux = klogctl(8, NULL, 5);
2243
if(ret_linux == -1){
2244
perror_plus("klogctl");
2246
restore_loglevel = true;
2249
#endif /* __linux__ */
2250
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2251
ioctl_errno = errno;
2253
if(restore_loglevel){
2254
ret_linux = klogctl(7, NULL, 0);
2255
if(ret_linux == -1){
2256
perror_plus("klogctl");
2259
#endif /* __linux__ */
2261
/* If raise_privileges() succeeded above */
2263
/* Lower privileges */
2264
ret_errno = lower_privileges();
2267
perror_plus("Failed to lower privileges");
2271
/* Close the socket */
2274
perror_plus("close");
2277
if(ret_setflags == -1){
2278
errno = ioctl_errno;
2279
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2284
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2288
/* Sleep checking until interface is running.
2289
Check every 0.25s, up to total time of delay */
2290
for(int i = 0; i < delay * 4; i++){
2291
if(interface_is_running(interface)){
2294
struct timespec sleeptime = { .tv_nsec = 250000000 };
2295
ret = nanosleep(&sleeptime, NULL);
2296
if(ret == -1 and errno != EINTR){
2297
perror_plus("nanosleep");
2305
__attribute__((nonnull, warn_unused_result))
2306
int take_down_interface(const char *const interface){
2307
int old_errno = errno;
2308
struct ifreq network;
2309
unsigned int if_index = if_nametoindex(interface);
2311
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2315
if(interface_is_up(interface)){
2317
int ioctl_errno = 0;
2318
if(not get_flags(interface, &network) and debug){
2320
fprintf_plus(stderr, "Failed to get flags for interface "
2321
"\"%s\"\n", interface);
2325
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2327
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2330
perror_plus("socket");
2336
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2340
/* Raise privileges */
2341
ret_errno = raise_privileges();
2344
perror_plus("Failed to raise privileges");
2347
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2348
ioctl_errno = errno;
2350
/* If raise_privileges() succeeded above */
2352
/* Lower privileges */
2353
ret_errno = lower_privileges();
2356
perror_plus("Failed to lower privileges");
2360
/* Close the socket */
2361
int ret = close(sd);
2363
perror_plus("close");
2366
if(ret_setflags == -1){
2367
errno = ioctl_errno;
2368
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2373
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
813
2381
int main(int argc, char *argv[]){
814
AvahiSServiceBrowser *sb = NULL;
817
int exitcode = EXIT_SUCCESS;
818
const char *interface = "eth0";
819
struct ifreq network;
823
char *connect_to = NULL;
824
char tempdir[] = "/tmp/mandosXXXXXX";
825
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
826
const char *seckey = PATHDIR "/" SECKEY;
827
const char *pubkey = PATHDIR "/" PUBKEY;
829
mandos_context mc = { .simple_poll = NULL, .server = NULL,
830
.dh_bits = 1024, .priority = "SECURE256"
831
":!CTYPE-X.509:+CTYPE-OPENPGP" };
832
bool gnutls_initalized = false;
833
bool pgpme_initalized = false;
836
struct argp_option options[] = {
837
{ .name = "debug", .key = 128,
838
.doc = "Debug mode", .group = 3 },
839
{ .name = "connect", .key = 'c',
840
.arg = "ADDRESS:PORT",
841
.doc = "Connect directly to a specific Mandos server",
843
{ .name = "interface", .key = 'i',
845
.doc = "Interface that will be used to search for Mandos"
848
{ .name = "seckey", .key = 's',
850
.doc = "OpenPGP secret key file base name",
852
{ .name = "pubkey", .key = 'p',
854
.doc = "OpenPGP public key file base name",
856
{ .name = "dh-bits", .key = 129,
858
.doc = "Bit length of the prime number used in the"
859
" Diffie-Hellman key exchange",
861
{ .name = "priority", .key = 130,
863
.doc = "GnuTLS priority string for the TLS handshake",
868
error_t parse_opt (int key, char *arg,
869
struct argp_state *state) {
870
/* Get the INPUT argument from `argp_parse', which we know is
871
a pointer to our plugin list pointer. */
873
case 128: /* --debug */
876
case 'c': /* --connect */
879
case 'i': /* --interface */
882
case 's': /* --seckey */
885
case 'p': /* --pubkey */
888
case 129: /* --dh-bits */
890
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
896
case 130: /* --priority */
904
return ARGP_ERR_UNKNOWN;
909
struct argp argp = { .options = options, .parser = parse_opt,
911
.doc = "Mandos client -- Get and decrypt"
912
" passwords from a Mandos server" };
913
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
914
if (ret == ARGP_ERR_UNKNOWN){
915
fprintf(stderr, "Unknown error while parsing arguments\n");
916
exitcode = EXIT_FAILURE;
921
ret = init_gnutls_global(&mc, pubkey, seckey);
923
fprintf(stderr, "init_gnutls_global failed\n");
924
exitcode = EXIT_FAILURE;
927
gnutls_initalized = true;
930
if(mkdtemp(tempdir) == NULL){
936
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
937
fprintf(stderr, "pgpme_initalized failed\n");
938
exitcode = EXIT_FAILURE;
941
pgpme_initalized = true;
944
/* If the interface is down, bring it up */
946
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
949
exitcode = EXIT_FAILURE;
952
strcpy(network.ifr_name, interface);
953
ret = ioctl(sd, SIOCGIFFLAGS, &network);
955
perror("ioctl SIOCGIFFLAGS");
956
exitcode = EXIT_FAILURE;
959
if((network.ifr_flags & IFF_UP) == 0){
960
network.ifr_flags |= IFF_UP;
961
ret = ioctl(sd, SIOCSIFFLAGS, &network);
963
perror("ioctl SIOCSIFFLAGS");
964
exitcode = EXIT_FAILURE;
968
ret = TEMP_FAILURE_RETRY(close(sd));
987
if_index = (AvahiIfIndex) if_nametoindex(interface);
989
fprintf(stderr, "No such interface: \"%s\"\n", interface);
993
if(connect_to != NULL){
994
/* Connect directly, do not use Zeroconf */
995
/* (Mainly meant for debugging) */
996
char *address = strrchr(connect_to, ':');
998
fprintf(stderr, "No colon in address\n");
999
exitcode = EXIT_FAILURE;
2382
mandos_context mc = { .server = NULL, .dh_bits = 0,
2383
.priority = "SECURE256:!CTYPE-X.509"
2384
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2385
.current_server = NULL, .interfaces = NULL,
2386
.interfaces_size = 0 };
2387
AvahiSServiceBrowser *sb = NULL;
2392
int exitcode = EXIT_SUCCESS;
2393
char *interfaces_to_take_down = NULL;
2394
size_t interfaces_to_take_down_size = 0;
2395
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2396
char old_tempdir[] = "/tmp/mandosXXXXXX";
2397
char *tempdir = NULL;
2398
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2399
const char *seckey = PATHDIR "/" SECKEY;
2400
const char *pubkey = PATHDIR "/" PUBKEY;
2401
const char *dh_params_file = NULL;
2402
char *interfaces_hooks = NULL;
2404
bool gnutls_initialized = false;
2405
bool gpgme_initialized = false;
2407
double retry_interval = 10; /* 10s between trying a server and
2408
retrying the same server again */
2410
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
2411
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2416
/* Lower any group privileges we might have, just to be safe */
2420
perror_plus("setgid");
2423
/* Lower user privileges (temporarily) */
2427
perror_plus("seteuid");
2435
struct argp_option options[] = {
2436
{ .name = "debug", .key = 128,
2437
.doc = "Debug mode", .group = 3 },
2438
{ .name = "connect", .key = 'c',
2439
.arg = "ADDRESS:PORT",
2440
.doc = "Connect directly to a specific Mandos server",
2442
{ .name = "interface", .key = 'i',
2444
.doc = "Network interface that will be used to search for"
2447
{ .name = "seckey", .key = 's',
2449
.doc = "OpenPGP secret key file base name",
2451
{ .name = "pubkey", .key = 'p',
2453
.doc = "OpenPGP public key file base name",
2455
{ .name = "dh-bits", .key = 129,
2457
.doc = "Bit length of the prime number used in the"
2458
" Diffie-Hellman key exchange",
2460
{ .name = "dh-params", .key = 134,
2462
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2463
" for the Diffie-Hellman key exchange",
2465
{ .name = "priority", .key = 130,
2467
.doc = "GnuTLS priority string for the TLS handshake",
2469
{ .name = "delay", .key = 131,
2471
.doc = "Maximum delay to wait for interface startup",
2473
{ .name = "retry", .key = 132,
2475
.doc = "Retry interval used when denied by the Mandos server",
2477
{ .name = "network-hook-dir", .key = 133,
2479
.doc = "Directory where network hooks are located",
2482
* These reproduce what we would get without ARGP_NO_HELP
2484
{ .name = "help", .key = '?',
2485
.doc = "Give this help list", .group = -1 },
2486
{ .name = "usage", .key = -3,
2487
.doc = "Give a short usage message", .group = -1 },
2488
{ .name = "version", .key = 'V',
2489
.doc = "Print program version", .group = -1 },
2493
error_t parse_opt(int key, char *arg,
2494
struct argp_state *state){
1003
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
1005
perror("Bad port number");
1006
exitcode = EXIT_FAILURE;
2497
case 128: /* --debug */
2500
case 'c': /* --connect */
2503
case 'i': /* --interface */
2504
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2507
argp_error(state, "%s", strerror(ret_errno));
2510
case 's': /* --seckey */
2513
case 'p': /* --pubkey */
2516
case 129: /* --dh-bits */
2518
tmpmax = strtoimax(arg, &tmp, 10);
2519
if(errno != 0 or tmp == arg or *tmp != '\0'
2520
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2521
argp_error(state, "Bad number of DH bits");
2523
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2525
case 134: /* --dh-params */
2526
dh_params_file = arg;
2528
case 130: /* --priority */
2531
case 131: /* --delay */
2533
delay = strtof(arg, &tmp);
2534
if(errno != 0 or tmp == arg or *tmp != '\0'){
2535
argp_error(state, "Bad delay");
2537
case 132: /* --retry */
2539
retry_interval = strtod(arg, &tmp);
2540
if(errno != 0 or tmp == arg or *tmp != '\0'
2541
or (retry_interval * 1000) > INT_MAX
2542
or retry_interval < 0){
2543
argp_error(state, "Bad retry interval");
2546
case 133: /* --network-hook-dir */
2550
* These reproduce what we would get without ARGP_NO_HELP
2552
case '?': /* --help */
2553
argp_state_help(state, state->out_stream,
2554
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2555
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2556
case -3: /* --usage */
2557
argp_state_help(state, state->out_stream,
2558
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2559
case 'V': /* --version */
2560
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2561
exit(argp_err_exit_status);
2564
return ARGP_ERR_UNKNOWN;
2569
struct argp argp = { .options = options, .parser = parse_opt,
2571
.doc = "Mandos client -- Get and decrypt"
2572
" passwords from a Mandos server" };
2573
ret_errno = argp_parse(&argp, argc, argv,
2574
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2581
perror_plus("argp_parse");
2582
exitcode = EX_OSERR;
2585
exitcode = EX_USAGE;
2591
/* Work around Debian bug #633582:
2592
<https://bugs.debian.org/633582> */
2594
/* Re-raise privileges */
2595
ret = raise_privileges();
2598
perror_plus("Failed to raise privileges");
2602
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2603
int seckey_fd = open(seckey, O_RDONLY);
2604
if(seckey_fd == -1){
2605
perror_plus("open");
2607
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2609
perror_plus("fstat");
2611
if(S_ISREG(st.st_mode)
2612
and st.st_uid == 0 and st.st_gid == 0){
2613
ret = fchown(seckey_fd, uid, gid);
2615
perror_plus("fchown");
2623
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2624
int pubkey_fd = open(pubkey, O_RDONLY);
2625
if(pubkey_fd == -1){
2626
perror_plus("open");
2628
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2630
perror_plus("fstat");
2632
if(S_ISREG(st.st_mode)
2633
and st.st_uid == 0 and st.st_gid == 0){
2634
ret = fchown(pubkey_fd, uid, gid);
2636
perror_plus("fchown");
2644
if(dh_params_file != NULL
2645
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2646
int dhparams_fd = open(dh_params_file, O_RDONLY);
2647
if(dhparams_fd == -1){
2648
perror_plus("open");
2650
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2652
perror_plus("fstat");
2654
if(S_ISREG(st.st_mode)
2655
and st.st_uid == 0 and st.st_gid == 0){
2656
ret = fchown(dhparams_fd, uid, gid);
2658
perror_plus("fchown");
2666
/* Lower privileges */
2667
ret = lower_privileges();
2670
perror_plus("Failed to lower privileges");
2675
/* Remove invalid interface names (except "none") */
2677
char *interface = NULL;
2678
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2680
if(strcmp(interface, "none") != 0
2681
and if_nametoindex(interface) == 0){
2682
if(interface[0] != '\0'){
2683
fprintf_plus(stderr, "Not using nonexisting interface"
2684
" \"%s\"\n", interface);
2686
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2692
/* Run network hooks */
2694
if(mc.interfaces != NULL){
2695
interfaces_hooks = malloc(mc.interfaces_size);
2696
if(interfaces_hooks == NULL){
2697
perror_plus("malloc");
1010
address = connect_to;
1011
ret = start_mandos_communication(address, port, if_index, &mc);
1013
exitcode = EXIT_FAILURE;
1015
exitcode = EXIT_SUCCESS;
1021
avahi_set_log_function(empty_log);
1024
/* Initialize the pseudo-RNG for Avahi */
1025
srand((unsigned int) time(NULL));
1027
/* Allocate main Avahi loop object */
1028
mc.simple_poll = avahi_simple_poll_new();
1029
if (mc.simple_poll == NULL) {
1030
fprintf(stderr, "Avahi: Failed to create simple poll"
1032
exitcode = EXIT_FAILURE;
1037
AvahiServerConfig config;
1038
/* Do not publish any local Zeroconf records */
1039
avahi_server_config_init(&config);
1040
config.publish_hinfo = 0;
1041
config.publish_addresses = 0;
1042
config.publish_workstation = 0;
1043
config.publish_domain = 0;
1045
/* Allocate a new server */
1046
mc.server = avahi_server_new(avahi_simple_poll_get
1047
(mc.simple_poll), &config, NULL,
1050
/* Free the Avahi configuration data */
1051
avahi_server_config_free(&config);
1054
/* Check if creating the Avahi server object succeeded */
1055
if (mc.server == NULL) {
1056
fprintf(stderr, "Failed to create Avahi server: %s\n",
1057
avahi_strerror(error));
1058
exitcode = EXIT_FAILURE;
1062
/* Create the Avahi service browser */
1063
sb = avahi_s_service_browser_new(mc.server, if_index,
1065
"_mandos._tcp", NULL, 0,
1066
browse_callback, &mc);
1068
fprintf(stderr, "Failed to create service browser: %s\n",
1069
avahi_strerror(avahi_server_errno(mc.server)));
1070
exitcode = EXIT_FAILURE;
1074
/* Run the main loop */
1077
fprintf(stderr, "Starting Avahi loop search\n");
1080
avahi_simple_poll_loop(mc.simple_poll);
2700
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2701
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2703
run_network_hooks("start", interfaces_hooks != NULL ?
2704
interfaces_hooks : "", delay);
2708
avahi_set_log_function(empty_log);
2711
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2712
from the signal handler */
2713
/* Initialize the pseudo-RNG for Avahi */
2714
srand((unsigned int) time(NULL));
2715
simple_poll = avahi_simple_poll_new();
2716
if(simple_poll == NULL){
2717
fprintf_plus(stderr,
2718
"Avahi: Failed to create simple poll object.\n");
2719
exitcode = EX_UNAVAILABLE;
2723
sigemptyset(&sigterm_action.sa_mask);
2724
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2726
perror_plus("sigaddset");
2727
exitcode = EX_OSERR;
2730
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2732
perror_plus("sigaddset");
2733
exitcode = EX_OSERR;
2736
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2738
perror_plus("sigaddset");
2739
exitcode = EX_OSERR;
2742
/* Need to check if the handler is SIG_IGN before handling:
2743
| [[info:libc:Initial Signal Actions]] |
2744
| [[info:libc:Basic Signal Handling]] |
2746
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2748
perror_plus("sigaction");
2751
if(old_sigterm_action.sa_handler != SIG_IGN){
2752
ret = sigaction(SIGINT, &sigterm_action, NULL);
2754
perror_plus("sigaction");
2755
exitcode = EX_OSERR;
2759
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2761
perror_plus("sigaction");
2764
if(old_sigterm_action.sa_handler != SIG_IGN){
2765
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2767
perror_plus("sigaction");
2768
exitcode = EX_OSERR;
2772
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2774
perror_plus("sigaction");
2777
if(old_sigterm_action.sa_handler != SIG_IGN){
2778
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2780
perror_plus("sigaction");
2781
exitcode = EX_OSERR;
2786
/* If no interfaces were specified, make a list */
2787
if(mc.interfaces == NULL){
2788
struct dirent **direntries = NULL;
2789
/* Look for any good interfaces */
2790
ret = scandir(sys_class_net, &direntries, good_interface,
2793
/* Add all found interfaces to interfaces list */
2794
for(int i = 0; i < ret; ++i){
2795
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2796
direntries[i]->d_name);
2799
perror_plus("argz_add");
2800
free(direntries[i]);
2804
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2805
direntries[i]->d_name);
2807
free(direntries[i]);
2814
fprintf_plus(stderr, "Could not find a network interface\n");
2815
exitcode = EXIT_FAILURE;
2820
/* Bring up interfaces which are down, and remove any "none"s */
2822
char *interface = NULL;
2823
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2825
/* If interface name is "none", stop bringing up interfaces.
2826
Also remove all instances of "none" from the list */
2827
if(strcmp(interface, "none") == 0){
2828
argz_delete(&mc.interfaces, &mc.interfaces_size,
2831
while((interface = argz_next(mc.interfaces,
2832
mc.interfaces_size, interface))){
2833
if(strcmp(interface, "none") == 0){
2834
argz_delete(&mc.interfaces, &mc.interfaces_size,
2841
bool interface_was_up = interface_is_up(interface);
2842
errno = bring_up_interface(interface, delay);
2843
if(not interface_was_up){
2845
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2846
" %s\n", interface, strerror(errno));
2848
errno = argz_add(&interfaces_to_take_down,
2849
&interfaces_to_take_down_size,
2852
perror_plus("argz_add");
2857
if(debug and (interfaces_to_take_down == NULL)){
2858
fprintf_plus(stderr, "No interfaces were brought up\n");
2862
/* If we only got one interface, explicitly use only that one */
2863
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2865
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2868
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2875
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2877
fprintf_plus(stderr, "init_gnutls_global failed\n");
2878
exitcode = EX_UNAVAILABLE;
2881
gnutls_initialized = true;
2888
/* Try /run/tmp before /tmp */
2889
tempdir = mkdtemp(run_tempdir);
2890
if(tempdir == NULL and errno == ENOENT){
2892
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2893
run_tempdir, old_tempdir);
2895
tempdir = mkdtemp(old_tempdir);
2897
if(tempdir == NULL){
2898
perror_plus("mkdtemp");
2906
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2907
fprintf_plus(stderr, "init_gpgme failed\n");
2908
exitcode = EX_UNAVAILABLE;
2911
gpgme_initialized = true;
2918
if(connect_to != NULL){
2919
/* Connect directly, do not use Zeroconf */
2920
/* (Mainly meant for debugging) */
2921
char *address = strrchr(connect_to, ':');
2923
if(address == NULL){
2924
fprintf_plus(stderr, "No colon in address\n");
2925
exitcode = EX_USAGE;
2935
tmpmax = strtoimax(address+1, &tmp, 10);
2936
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2937
or tmpmax != (in_port_t)tmpmax){
2938
fprintf_plus(stderr, "Bad port number\n");
2939
exitcode = EX_USAGE;
2947
port = (in_port_t)tmpmax;
2949
/* Colon in address indicates IPv6 */
2951
if(strchr(connect_to, ':') != NULL){
2953
/* Accept [] around IPv6 address - see RFC 5952 */
2954
if(connect_to[0] == '[' and address[-1] == ']')
2962
address = connect_to;
2968
while(not quit_now){
2969
ret = start_mandos_communication(address, port, if_index, af,
2971
if(quit_now or ret == 0){
2975
fprintf_plus(stderr, "Retrying in %d seconds\n",
2976
(int)retry_interval);
2978
sleep((unsigned int)retry_interval);
2982
exitcode = EXIT_SUCCESS;
2993
AvahiServerConfig config;
2994
/* Do not publish any local Zeroconf records */
2995
avahi_server_config_init(&config);
2996
config.publish_hinfo = 0;
2997
config.publish_addresses = 0;
2998
config.publish_workstation = 0;
2999
config.publish_domain = 0;
3001
/* Allocate a new server */
3002
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3003
&config, NULL, NULL, &ret);
3005
/* Free the Avahi configuration data */
3006
avahi_server_config_free(&config);
3009
/* Check if creating the Avahi server object succeeded */
3010
if(mc.server == NULL){
3011
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3012
avahi_strerror(ret));
3013
exitcode = EX_UNAVAILABLE;
3021
/* Create the Avahi service browser */
3022
sb = avahi_s_service_browser_new(mc.server, if_index,
3023
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
3024
NULL, 0, browse_callback,
3027
fprintf_plus(stderr, "Failed to create service browser: %s\n",
3028
avahi_strerror(avahi_server_errno(mc.server)));
3029
exitcode = EX_UNAVAILABLE;
3037
/* Run the main loop */
3040
fprintf_plus(stderr, "Starting Avahi loop search\n");
3043
ret = avahi_loop_with_timeout(simple_poll,
3044
(int)(retry_interval * 1000), &mc);
3046
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
3047
(ret == 0) ? "successfully" : "with error");
1085
fprintf(stderr, "%s exiting\n", argv[0]);
1088
/* Cleanup things */
1090
avahi_s_service_browser_free(sb);
1092
if (mc.server != NULL)
1093
avahi_server_free(mc.server);
1095
if (mc.simple_poll != NULL)
1096
avahi_simple_poll_free(mc.simple_poll);
1098
if (gnutls_initalized){
1099
gnutls_certificate_free_credentials(mc.cred);
1100
gnutls_global_deinit ();
1103
if(pgpme_initalized){
1104
gpgme_release(mc.ctx);
1107
/* Removes the temp directory used by GPGME */
1108
if(tempdir[0] != '\0'){
1110
struct dirent *direntry;
1111
d = opendir(tempdir);
1116
direntry = readdir(d);
1117
if(direntry == NULL){
1120
if (direntry->d_type == DT_REG){
1121
char *fullname = NULL;
1122
ret = asprintf(&fullname, "%s/%s", tempdir,
1128
ret = unlink(fullname);
1130
fprintf(stderr, "unlink(\"%s\"): %s",
1131
fullname, strerror(errno));
1137
ret = rmdir(tempdir);
3053
if(signal_received){
3054
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3055
argv[0], signal_received,
3056
strsignal(signal_received));
3058
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3062
/* Cleanup things */
3063
free(mc.interfaces);
3066
avahi_s_service_browser_free(sb);
3068
if(mc.server != NULL)
3069
avahi_server_free(mc.server);
3071
if(simple_poll != NULL)
3072
avahi_simple_poll_free(simple_poll);
3074
if(gnutls_initialized){
3075
gnutls_certificate_free_credentials(mc.cred);
3076
gnutls_dh_params_deinit(mc.dh_params);
3079
if(gpgme_initialized){
3080
gpgme_release(mc.ctx);
3083
/* Cleans up the circular linked list of Mandos servers the client
3085
if(mc.current_server != NULL){
3086
mc.current_server->prev->next = NULL;
3087
while(mc.current_server != NULL){
3088
server *next = mc.current_server->next;
3090
#pragma GCC diagnostic push
3091
#pragma GCC diagnostic ignored "-Wcast-qual"
3093
free((char *)(mc.current_server->ip));
3095
#pragma GCC diagnostic pop
3097
free(mc.current_server);
3098
mc.current_server = next;
3102
/* Re-raise privileges */
3104
ret = raise_privileges();
3107
perror_plus("Failed to raise privileges");
3110
/* Run network hooks */
3111
run_network_hooks("stop", interfaces_hooks != NULL ?
3112
interfaces_hooks : "", delay);
3114
/* Take down the network interfaces which were brought up */
3116
char *interface = NULL;
3117
while((interface = argz_next(interfaces_to_take_down,
3118
interfaces_to_take_down_size,
3120
ret = take_down_interface(interface);
3123
perror_plus("Failed to take down interface");
3126
if(debug and (interfaces_to_take_down == NULL)){
3127
fprintf_plus(stderr, "No interfaces needed to be taken"
3133
ret = lower_privileges_permanently();
3136
perror_plus("Failed to lower privileges permanently");
3140
free(interfaces_to_take_down);
3141
free(interfaces_hooks);
3143
void clean_dir_at(int base, const char * const dirname,
3145
struct dirent **direntries = NULL;
3147
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3153
perror_plus("open");
3156
int numentries = scandirat(dir_fd, ".", &direntries,
3157
notdotentries, alphasort);
3158
if(numentries >= 0){
3159
for(int i = 0; i < numentries; i++){
3161
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3162
dirname, direntries[i]->d_name);
3164
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3166
if(errno == EISDIR){
3167
dret = unlinkat(dir_fd, direntries[i]->d_name,
3170
if((dret == -1) and (errno == ENOTEMPTY)
3171
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3172
== 0) and (level == 0)){
3173
/* Recurse only in this special case */
3174
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3177
if((dret == -1) and (errno != ENOENT)){
3178
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3179
direntries[i]->d_name, strerror(errno));
3182
free(direntries[i]);
3185
/* need to clean even if 0 because man page doesn't specify */
3187
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3188
if(dret == -1 and errno != ENOENT){
3189
perror_plus("rmdir");
3192
perror_plus("scandirat");
3197
/* Removes the GPGME temp directory and all files inside */
3198
if(tempdir != NULL){
3199
clean_dir_at(-1, tempdir, 0);
3203
sigemptyset(&old_sigterm_action.sa_mask);
3204
old_sigterm_action.sa_handler = SIG_DFL;
3205
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
3206
&old_sigterm_action,
3209
perror_plus("sigaction");
3212
ret = raise(signal_received);
3213
} while(ret != 0 and errno == EINTR);
3215
perror_plus("raise");
3218
TEMP_FAILURE_RETRY(pause());