99
131
#define BUFFER_SIZE 256
133
#define PATHDIR "/conf/conf.d/mandos"
134
#define SECKEY "seckey.txt"
135
#define PUBKEY "pubkey.txt"
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
101
138
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
103
139
static const char mandos_protocol_version[] = "1";
104
const char *argp_program_version = "password-request 1.0";
105
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
140
const char *argp_program_version = "mandos-client " VERSION;
141
const char *argp_program_bug_address = "<mandos@recompile.se>";
142
static const char sys_class_net[] = "/sys/class/net";
143
char *connect_to = NULL;
144
const char *hookdir = HOOKDIR;
149
/* Doubly linked list that need to be circularly linked when used */
150
typedef struct server{
153
AvahiIfIndex if_index;
155
struct timespec last_seen;
107
160
/* Used for passing in values through the Avahi callback functions */
109
AvahiSimplePoll *simple_poll;
110
162
AvahiServer *server;
111
163
gnutls_certificate_credentials_t cred;
112
164
unsigned int dh_bits;
113
165
gnutls_dh_params_t dh_params;
114
166
const char *priority;
168
server *current_server;
170
size_t interfaces_size;
115
171
} mandos_context;
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
176
sig_atomic_t quit_now = 0;
177
int signal_received = 0;
179
/* Function to use when printing errors */
180
void perror_plus(const char *print_text){
182
fprintf(stderr, "Mandos plugin %s: ",
183
program_invocation_short_name);
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
189
int fprintf_plus(FILE *stream, const char *format, ...){
191
va_start (ap, format);
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
118
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
119
* "buffer_capacity" is how much is currently allocated,
199
* Make additional room in "buffer" for at least BUFFER_SIZE more
200
* bytes. "buffer_capacity" is how much is currently allocated,
120
201
* "buffer_length" is how much is already used.
122
size_t adjustbuffer(char **buffer, size_t buffer_length,
123
size_t buffer_capacity){
124
if (buffer_length + BUFFER_SIZE > buffer_capacity){
125
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
203
__attribute__((nonnull, warn_unused_result))
204
size_t incbuffer(char **buffer, size_t buffer_length,
205
size_t buffer_capacity){
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
209
int old_errno = errno;
129
216
buffer_capacity += BUFFER_SIZE;
131
218
return buffer_capacity;
221
/* 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){
226
server *new_server = malloc(sizeof(server));
227
if(new_server == NULL){
228
perror_plus("malloc");
231
*new_server = (server){ .ip = strdup(ip),
233
.if_index = if_index,
235
if(new_server->ip == NULL){
236
perror_plus("strdup");
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
242
perror_plus("clock_gettime");
244
#pragma GCC diagnostic push
245
#pragma GCC diagnostic ignored "-Wcast-qual"
247
free((char *)(new_server->ip));
249
#pragma GCC diagnostic pop
254
/* Special case of first server */
255
if(*current_server == NULL){
256
new_server->next = new_server;
257
new_server->prev = new_server;
258
*current_server = new_server;
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;
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
138
static ssize_t pgp_packet_decrypt (const char *cryptotext,
141
const char *homedir){
142
gpgme_data_t dh_crypto, dh_plain;
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,
144
277
gpgme_error_t rc;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
148
278
gpgme_engine_info_t engine_info;
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
281
* Helper function to insert pub and seckey to the engine keyring.
283
bool import_key(const char * const filename){
286
gpgme_data_t pgp_data;
288
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
294
rc = gpgme_data_new_from_fd(&pgp_data, fd);
295
if(rc != GPG_ERR_NO_ERROR){
296
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
297
gpgme_strsource(rc), gpgme_strerror(rc));
301
rc = gpgme_op_import(mc->ctx, pgp_data);
302
if(rc != GPG_ERR_NO_ERROR){
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
308
ret = (int)TEMP_FAILURE_RETRY(close(fd));
310
perror_plus("close");
312
gpgme_data_release(pgp_data);
317
fprintf_plus(stderr, "Initializing GPGME\n");
155
321
gpgme_check_version(NULL);
156
322
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
157
if (rc != GPG_ERR_NO_ERROR){
158
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
159
gpgme_strsource(rc), gpgme_strerror(rc));
323
if(rc != GPG_ERR_NO_ERROR){
324
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
325
gpgme_strsource(rc), gpgme_strerror(rc));
163
329
/* Set GPGME home directory for the OpenPGP engine only */
164
rc = gpgme_get_engine_info (&engine_info);
165
if (rc != GPG_ERR_NO_ERROR){
166
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
167
gpgme_strsource(rc), gpgme_strerror(rc));
330
rc = gpgme_get_engine_info(&engine_info);
331
if(rc != GPG_ERR_NO_ERROR){
332
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
333
gpgme_strsource(rc), gpgme_strerror(rc));
170
336
while(engine_info != NULL){
171
337
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
172
338
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
173
engine_info->file_name, homedir);
339
engine_info->file_name, tempdir);
176
342
engine_info = engine_info->next;
178
344
if(engine_info == NULL){
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
345
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
350
/* Create new GPGME "context" */
351
rc = gpgme_new(&(mc->ctx));
352
if(rc != GPG_ERR_NO_ERROR){
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
359
if(not import_key(pubkey) or not import_key(seckey)){
367
* Decrypt OpenPGP data.
368
* Returns -1 on error
370
__attribute__((nonnull, warn_unused_result))
371
static ssize_t pgp_packet_decrypt(const char *cryptotext,
375
gpgme_data_t dh_crypto, dh_plain;
378
size_t plaintext_capacity = 0;
379
ssize_t plaintext_length = 0;
382
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
183
385
/* Create new GPGME data buffer from memory cryptotext */
184
386
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
186
if (rc != GPG_ERR_NO_ERROR){
187
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
388
if(rc != GPG_ERR_NO_ERROR){
389
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
390
gpgme_strsource(rc), gpgme_strerror(rc));
192
394
/* Create new empty GPGME data buffer for the plaintext */
193
395
rc = gpgme_data_new(&dh_plain);
194
if (rc != GPG_ERR_NO_ERROR){
195
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
196
gpgme_strsource(rc), gpgme_strerror(rc));
396
if(rc != GPG_ERR_NO_ERROR){
397
fprintf_plus(stderr, "Mandos plugin mandos-client: "
398
"bad gpgme_data_new: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
197
400
gpgme_data_release(dh_crypto);
201
/* Create new GPGME "context" */
202
rc = gpgme_new(&ctx);
203
if (rc != GPG_ERR_NO_ERROR){
204
fprintf(stderr, "bad gpgme_new: %s: %s\n",
205
gpgme_strsource(rc), gpgme_strerror(rc));
206
plaintext_length = -1;
210
404
/* Decrypt data from the cryptotext data buffer to the plaintext
212
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
213
if (rc != GPG_ERR_NO_ERROR){
214
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
215
gpgme_strsource(rc), gpgme_strerror(rc));
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
407
if(rc != GPG_ERR_NO_ERROR){
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
gpgme_strsource(rc), gpgme_strerror(rc));
216
410
plaintext_length = -1;
218
412
gpgme_decrypt_result_t result;
219
result = gpgme_op_decrypt_result(ctx);
221
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
413
result = gpgme_op_decrypt_result(mc->ctx);
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
223
fprintf(stderr, "Unsupported algorithm: %s\n",
224
result->unsupported_algorithm);
225
fprintf(stderr, "Wrong key usage: %u\n",
226
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);
227
421
if(result->file_name != NULL){
228
fprintf(stderr, "File name: %s\n", result->file_name);
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
230
424
gpgme_recipient_t recipient;
231
425
recipient = result->recipients;
233
while(recipient != NULL){
234
fprintf(stderr, "Public key algorithm: %s\n",
235
gpgme_pubkey_algo_name(recipient->pubkey_algo));
236
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
237
fprintf(stderr, "Secret key available: %s\n",
238
recipient->status == GPG_ERR_NO_SECKEY
240
recipient = recipient->next;
426
while(recipient != NULL){
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
434
recipient = recipient->next;
434
650
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
435
651
__attribute__((unused)) const char *txt){}
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){
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();
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){
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){
705
/* Helper function to add_local_route() and remove_local_route() */
706
__attribute__((nonnull, warn_unused_result))
707
static bool add_remove_local_route(const bool add,
709
AvahiIfIndex if_index){
711
char helper[] = "mandos-client-iprouteadddel";
712
char add_arg[] = "add";
713
char delete_arg[] = "delete";
714
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
715
if(pluginhelperdir == NULL){
717
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
718
" variable not set; cannot run helper\n");
723
char interface[IF_NAMESIZE];
724
if(if_indextoname((unsigned int)if_index, interface) == NULL){
725
perror_plus("if_indextoname");
729
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
731
perror_plus("open(\"/dev/null\", O_RDONLY)");
737
/* Raise privileges */
738
errno = raise_privileges_permanently();
740
perror_plus("Failed to raise privileges");
741
/* _exit(EX_NOPERM); */
747
perror_plus("setgid");
750
/* Reset supplementary groups */
752
ret = setgroups(0, NULL);
754
perror_plus("setgroups");
758
ret = dup2(devnull, STDIN_FILENO);
760
perror_plus("dup2(devnull, STDIN_FILENO)");
763
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
765
perror_plus("close");
768
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
770
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
773
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
778
if(helperdir_fd == -1){
780
_exit(EX_UNAVAILABLE);
782
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
785
perror_plus("openat");
786
_exit(EX_UNAVAILABLE);
788
TEMP_FAILURE_RETRY(close(helperdir_fd));
790
#pragma GCC diagnostic push
791
#pragma GCC diagnostic ignored "-Wcast-qual"
793
if(fexecve(helper_fd, (char *const [])
794
{ helper, add ? add_arg : delete_arg, (char *)address,
795
interface, NULL }, environ) == -1){
797
#pragma GCC diagnostic pop
799
perror_plus("fexecve");
811
pret = waitpid(pid, &status, 0);
812
if(pret == -1 and errno == EINTR and quit_now){
813
int errno_raising = 0;
814
if((errno = raise_privileges()) != 0){
815
errno_raising = errno;
816
perror_plus("Failed to raise privileges in order to"
817
" kill helper program");
819
if(kill(pid, SIGTERM) == -1){
822
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
823
perror_plus("Failed to lower privileges after killing"
828
} while(pret == -1 and errno == EINTR);
830
perror_plus("waitpid");
833
if(WIFEXITED(status)){
834
if(WEXITSTATUS(status) != 0){
835
fprintf_plus(stderr, "Error: iprouteadddel exited"
836
" with status %d\n", WEXITSTATUS(status));
841
if(WIFSIGNALED(status)){
842
fprintf_plus(stderr, "Error: iprouteadddel died by"
843
" signal %d\n", WTERMSIG(status));
846
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
850
__attribute__((nonnull, warn_unused_result))
851
static bool add_local_route(const char *address,
852
AvahiIfIndex if_index){
853
return add_remove_local_route(true, address, if_index);
856
__attribute__((nonnull, warn_unused_result))
857
static bool remove_local_route(const char *address,
858
AvahiIfIndex if_index){
859
return add_remove_local_route(false, address, if_index);
437
862
/* Called when a Mandos server is found */
438
static int start_mandos_communication(const char *ip, uint16_t port,
863
__attribute__((nonnull, warn_unused_result))
864
static int start_mandos_communication(const char *ip, in_port_t port,
439
865
AvahiIfIndex if_index,
442
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
866
int af, mandos_context *mc){
867
int ret, tcp_sd = -1;
869
struct sockaddr_storage to;
443
870
char *buffer = NULL;
444
char *decrypted_buffer;
871
char *decrypted_buffer = NULL;
445
872
size_t buffer_length = 0;
446
873
size_t buffer_capacity = 0;
447
ssize_t decrypted_buffer_size;
450
char interface[IF_NAMESIZE];
451
876
gnutls_session_t session;
453
ret = init_gnutls_session (mc, &session);
459
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
463
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
470
if(if_indextoname((unsigned int)if_index, interface) == NULL){
471
perror("if_indextoname");
877
int pf; /* Protocol family */
878
bool route_added = false;
895
fprintf_plus(stderr, "Bad address family: %d\n", af);
900
/* If the interface is specified and we have a list of interfaces */
901
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
902
/* Check if the interface is one of the interfaces we are using */
905
char *interface = NULL;
906
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
908
if(if_nametoindex(interface) == (unsigned int)if_index){
915
/* This interface does not match any in the list, so we don't
916
connect to the server */
918
char interface[IF_NAMESIZE];
919
if(if_indextoname((unsigned int)if_index, interface) == NULL){
920
perror_plus("if_indextoname");
922
fprintf_plus(stderr, "Skipping server on non-used interface"
924
if_indextoname((unsigned int)if_index,
474
fprintf(stderr, "Binding to interface %s\n", interface);
932
ret = init_gnutls_session(&session, mc);
938
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
939
PRIuMAX "\n", ip, (uintmax_t)port);
942
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
945
perror_plus("socket");
477
955
memset(&to, 0, sizeof(to));
478
to.in6.sin6_family = AF_INET6;
479
/* It would be nice to have a way to detect if we were passed an
480
IPv4 address here. Now we assume an IPv6 address. */
481
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
957
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
958
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
960
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
961
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
965
perror_plus("inet_pton");
487
fprintf(stderr, "Bad address: %s\n", ip);
490
to.in6.sin6_port = htons(port); /* Spurious warning */
971
fprintf_plus(stderr, "Bad address: %s\n", ip);
976
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
977
if(IN6_IS_ADDR_LINKLOCAL
978
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
979
if(if_index == AVAHI_IF_UNSPEC){
980
fprintf_plus(stderr, "An IPv6 link-local address is"
981
" incomplete without a network interface\n");
985
/* Set the network interface number as scope */
986
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
989
((struct sockaddr_in *)&to)->sin_port = htons(port);
492
to.in6.sin6_scope_id = (uint32_t)if_index;
495
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
497
char addrstr[INET6_ADDRSTRLEN] = "";
498
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
499
sizeof(addrstr)) == NULL){
502
if(strcmp(addrstr, ip) != 0){
503
fprintf(stderr, "Canonical address form: %s\n", addrstr);
508
ret = connect(tcp_sd, &to.in, sizeof(to));
998
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
999
char interface[IF_NAMESIZE];
1000
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1001
perror_plus("if_indextoname");
1003
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1004
"\n", ip, interface, (uintmax_t)port);
1007
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1008
ip, (uintmax_t)port);
1010
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1011
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1013
ret = getnameinfo((struct sockaddr *)&to,
1014
sizeof(struct sockaddr_in6),
1015
addrstr, sizeof(addrstr), NULL, 0,
1018
ret = getnameinfo((struct sockaddr *)&to,
1019
sizeof(struct sockaddr_in),
1020
addrstr, sizeof(addrstr), NULL, 0,
1023
if(ret == EAI_SYSTEM){
1024
perror_plus("getnameinfo");
1025
} else if(ret != 0) {
1026
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1027
} else if(strcmp(addrstr, ip) != 0){
1028
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1039
ret = connect(tcp_sd, (struct sockaddr *)&to,
1040
sizeof(struct sockaddr_in6));
1042
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1043
sizeof(struct sockaddr_in));
1046
if(errno == ENETUNREACH
1047
and if_index != AVAHI_IF_UNSPEC
1048
and connect_to == NULL
1049
and not route_added and
1050
((af == AF_INET6 and not
1051
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1053
or (af == AF_INET and
1054
/* Not a a IPv4LL address */
1055
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1056
& 0xFFFF0000L) != 0xA9FE0000L))){
1057
/* Work around Avahi bug - Avahi does not announce link-local
1058
addresses if it has a global address, so local hosts with
1059
*only* a link-local address (e.g. Mandos clients) cannot
1060
connect to a Mandos server announced by Avahi on a server
1061
host with a global address. Work around this by retrying
1062
with an explicit route added with the server's address.
1064
Avahi bug reference:
1065
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1066
https://bugs.debian.org/587961
1069
route_added = add_local_route(ip, if_index);
1075
if(errno != ECONNREFUSED or debug){
1077
perror_plus("connect");
514
1090
const char *out = mandos_protocol_version;
517
1093
size_t out_size = strlen(out);
518
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
519
out_size - written));
1094
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
1095
out_size - written));
1098
perror_plus("write");
523
1100
goto mandos_end;
525
1102
written += (size_t)ret;
526
1103
if(written < out_size){
529
if (out == mandos_protocol_version){
1106
if(out == mandos_protocol_version){
539
fprintf(stderr, "Establishing TLS session with %s\n", ip);
542
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
545
ret = gnutls_handshake (session);
1121
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
1129
/* This casting via intptr_t is to eliminate warning about casting
1130
an int to a pointer type. This is exactly how the GnuTLS Guile
1131
function "set-session-transport-fd!" does it. */
1132
gnutls_transport_set_ptr(session,
1133
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
1141
ret = gnutls_handshake(session);
546
1146
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
548
if (ret != GNUTLS_E_SUCCESS){
1148
if(ret != GNUTLS_E_SUCCESS){
550
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1150
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
554
1154
goto mandos_end;
557
1157
/* Read OpenPGP packet that contains the wanted password */
560
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
1160
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
565
buffer_capacity = adjustbuffer(&buffer, buffer_length,
567
if (buffer_capacity == 0){
568
perror("adjustbuffer");
573
ret = gnutls_record_recv(session, buffer+buffer_length,
1171
buffer_capacity = incbuffer(&buffer, buffer_length,
1173
if(buffer_capacity == 0){
1175
perror_plus("incbuffer");
1185
sret = gnutls_record_recv(session, buffer+buffer_length,
580
1192
case GNUTLS_E_INTERRUPTED:
581
1193
case GNUTLS_E_AGAIN:
583
1195
case GNUTLS_E_REHANDSHAKE:
585
ret = gnutls_handshake (session);
1197
ret = gnutls_handshake(session);
586
1203
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
588
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1205
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
591
1209
goto mandos_end;
595
fprintf(stderr, "Unknown error while reading data from"
596
" encrypted session with Mandos server\n");
598
gnutls_bye (session, GNUTLS_SHUT_RDWR);
1213
fprintf_plus(stderr, "Unknown error while reading data from"
1214
" encrypted session with Mandos server\n");
1215
gnutls_bye(session, GNUTLS_SHUT_RDWR);
599
1217
goto mandos_end;
602
buffer_length += (size_t) ret;
1220
buffer_length += (size_t) sret;
607
fprintf(stderr, "Closing TLS session\n");
610
gnutls_bye (session, GNUTLS_SHUT_RDWR);
612
if (buffer_length > 0){
613
decrypted_buffer_size = pgp_packet_decrypt(buffer,
617
if (decrypted_buffer_size >= 0){
1225
fprintf_plus(stderr, "Closing TLS session\n");
1234
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
1239
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1241
if(buffer_length > 0){
1242
ssize_t decrypted_buffer_size;
1243
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1244
&decrypted_buffer, mc);
1245
if(decrypted_buffer_size >= 0){
619
1248
while(written < (size_t) decrypted_buffer_size){
620
ret = (int)fwrite (decrypted_buffer + written, 1,
621
(size_t)decrypted_buffer_size - written,
1254
ret = (int)fwrite(decrypted_buffer + written, 1,
1255
(size_t)decrypted_buffer_size - written,
623
1257
if(ret == 0 and ferror(stdout)){
625
fprintf(stderr, "Error writing encrypted data: %s\n",
1260
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
631
1266
written += (size_t)ret;
633
free(decrypted_buffer);
641
1272
/* Shutdown procedure */
646
gnutls_deinit (session);
1277
if(not remove_local_route(ip, if_index)){
1278
fprintf_plus(stderr, "Failed to remove local route to %s on"
1279
" interface %d", ip, if_index);
1283
free(decrypted_buffer);
1286
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1292
perror_plus("close");
1294
gnutls_deinit(session);
1304
__attribute__((nonnull))
650
1305
static void resolve_callback(AvahiSServiceResolver *r,
651
1306
AvahiIfIndex interface,
652
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1307
AvahiProtocol proto,
653
1308
AvahiResolverEvent event,
654
1309
const char *name,
655
1310
const char *type,
738
1419
case AVAHI_BROWSER_ALL_FOR_NOW:
739
1420
case AVAHI_BROWSER_CACHE_EXHAUSTED:
741
fprintf(stderr, "No Mandos server found, still searching...\n");
1422
fprintf_plus(stderr, "No Mandos server found, still"
747
/* Combines file name and path and returns the malloced new
748
string. some sane checks could/should be added */
749
static char *combinepath(const char *first, const char *second){
1429
/* Signal handler that stops main loop after SIGTERM */
1430
static void handle_sigterm(int sig){
1435
signal_received = sig;
1436
int old_errno = errno;
1437
/* set main loop to exit */
1438
if(simple_poll != NULL){
1439
avahi_simple_poll_quit(simple_poll);
1444
__attribute__((nonnull, warn_unused_result))
1445
bool get_flags(const char *ifname, struct ifreq *ifr){
1449
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1452
perror_plus("socket");
1456
strcpy(ifr->ifr_name, ifname);
1457
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1461
perror_plus("ioctl SIOCGIFFLAGS");
1469
__attribute__((nonnull, warn_unused_result))
1470
bool good_flags(const char *ifname, const struct ifreq *ifr){
1472
/* Reject the loopback device */
1473
if(ifr->ifr_flags & IFF_LOOPBACK){
1475
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1480
/* Accept point-to-point devices only if connect_to is specified */
1481
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1483
fprintf_plus(stderr, "Accepting point-to-point interface"
1484
" \"%s\"\n", ifname);
1488
/* Otherwise, reject non-broadcast-capable devices */
1489
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1491
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1492
" \"%s\"\n", ifname);
1496
/* Reject non-ARP interfaces (including dummy interfaces) */
1497
if(ifr->ifr_flags & IFF_NOARP){
1499
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1505
/* Accept this device */
1507
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1513
* This function determines if a directory entry in /sys/class/net
1514
* corresponds to an acceptable network device.
1515
* (This function is passed to scandir(3) as a filter function.)
1517
__attribute__((nonnull, warn_unused_result))
1518
int good_interface(const struct dirent *if_entry){
1519
if(if_entry->d_name[0] == '.'){
1524
if(not get_flags(if_entry->d_name, &ifr)){
1526
fprintf_plus(stderr, "Failed to get flags for interface "
1527
"\"%s\"\n", if_entry->d_name);
1532
if(not good_flags(if_entry->d_name, &ifr)){
1539
* This function determines if a network interface is up.
1541
__attribute__((nonnull, warn_unused_result))
1542
bool interface_is_up(const char *interface){
1544
if(not get_flags(interface, &ifr)){
1546
fprintf_plus(stderr, "Failed to get flags for interface "
1547
"\"%s\"\n", interface);
1552
return (bool)(ifr.ifr_flags & IFF_UP);
1556
* This function determines if a network interface is running
1558
__attribute__((nonnull, warn_unused_result))
1559
bool interface_is_running(const char *interface){
1561
if(not get_flags(interface, &ifr)){
1563
fprintf_plus(stderr, "Failed to get flags for interface "
1564
"\"%s\"\n", interface);
1569
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1572
__attribute__((nonnull, pure, warn_unused_result))
1573
int notdotentries(const struct dirent *direntry){
1574
/* Skip "." and ".." */
1575
if(direntry->d_name[0] == '.'
1576
and (direntry->d_name[1] == '\0'
1577
or (direntry->d_name[1] == '.'
1578
and direntry->d_name[2] == '\0'))){
1584
/* Is this directory entry a runnable program? */
1585
__attribute__((nonnull, warn_unused_result))
1586
int runnable_hook(const struct dirent *direntry){
1591
if((direntry->d_name)[0] == '\0'){
1596
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1597
"abcdefghijklmnopqrstuvwxyz"
1600
if((direntry->d_name)[sret] != '\0'){
1601
/* Contains non-allowed characters */
1603
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1609
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1612
perror_plus("Could not stat hook");
1616
if(not (S_ISREG(st.st_mode))){
1617
/* Not a regular file */
1619
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1624
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1625
/* Not executable */
1627
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1633
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1639
__attribute__((nonnull, warn_unused_result))
1640
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1641
mandos_context *mc){
1643
struct timespec now;
1644
struct timespec waited_time;
1645
intmax_t block_time;
1648
if(mc->current_server == NULL){
1650
fprintf_plus(stderr, "Wait until first server is found."
1653
ret = avahi_simple_poll_iterate(s, -1);
1656
fprintf_plus(stderr, "Check current_server if we should run"
1659
/* the current time */
1660
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1662
perror_plus("clock_gettime");
1665
/* Calculating in ms how long time between now and server
1666
who we visted longest time ago. Now - last seen. */
1667
waited_time.tv_sec = (now.tv_sec
1668
- mc->current_server->last_seen.tv_sec);
1669
waited_time.tv_nsec = (now.tv_nsec
1670
- mc->current_server->last_seen.tv_nsec);
1671
/* total time is 10s/10,000ms.
1672
Converting to s from ms by dividing by 1,000,
1673
and ns to ms by dividing by 1,000,000. */
1674
block_time = ((retry_interval
1675
- ((intmax_t)waited_time.tv_sec * 1000))
1676
- ((intmax_t)waited_time.tv_nsec / 1000000));
1679
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1683
if(block_time <= 0){
1684
ret = start_mandos_communication(mc->current_server->ip,
1685
mc->current_server->port,
1686
mc->current_server->if_index,
1687
mc->current_server->af, mc);
1689
avahi_simple_poll_quit(s);
1692
ret = clock_gettime(CLOCK_MONOTONIC,
1693
&mc->current_server->last_seen);
1695
perror_plus("clock_gettime");
1698
mc->current_server = mc->current_server->next;
1699
block_time = 0; /* Call avahi to find new Mandos
1700
servers, but don't block */
1703
ret = avahi_simple_poll_iterate(s, (int)block_time);
1706
if(ret > 0 or errno != EINTR){
1707
return (ret != 1) ? ret : 0;
1713
__attribute__((nonnull))
1714
void run_network_hooks(const char *mode, const char *interface,
1716
struct dirent **direntries = NULL;
1717
if(hookdir_fd == -1){
1718
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1720
if(hookdir_fd == -1){
1721
if(errno == ENOENT){
1723
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1724
" found\n", hookdir);
1727
perror_plus("open");
1733
#if __GLIBC_PREREQ(2, 15)
1734
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1735
runnable_hook, alphasort);
1736
#else /* not __GLIBC_PREREQ(2, 15) */
1737
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1739
#endif /* not __GLIBC_PREREQ(2, 15) */
1740
#else /* not __GLIBC__ */
1741
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1743
#endif /* not __GLIBC__ */
1745
perror_plus("scandir");
1748
struct dirent *direntry;
1750
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1752
perror_plus("open(\"/dev/null\", O_RDONLY)");
1755
for(int i = 0; i < numhooks; i++){
1756
direntry = direntries[i];
1758
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1761
pid_t hook_pid = fork();
1764
/* Raise privileges */
1765
errno = raise_privileges_permanently();
1767
perror_plus("Failed to raise privileges");
1774
perror_plus("setgid");
1777
/* Reset supplementary groups */
1779
ret = setgroups(0, NULL);
1781
perror_plus("setgroups");
1784
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1786
perror_plus("setenv");
1789
ret = setenv("DEVICE", interface, 1);
1791
perror_plus("setenv");
1794
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1796
perror_plus("setenv");
1799
ret = setenv("MODE", mode, 1);
1801
perror_plus("setenv");
1805
ret = asprintf(&delaystring, "%f", (double)delay);
1807
perror_plus("asprintf");
1810
ret = setenv("DELAY", delaystring, 1);
1813
perror_plus("setenv");
1817
if(connect_to != NULL){
1818
ret = setenv("CONNECT", connect_to, 1);
1820
perror_plus("setenv");
1824
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
1828
perror_plus("openat");
1829
_exit(EXIT_FAILURE);
1831
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1832
perror_plus("close");
1833
_exit(EXIT_FAILURE);
1835
ret = dup2(devnull, STDIN_FILENO);
1837
perror_plus("dup2(devnull, STDIN_FILENO)");
1840
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
1842
perror_plus("close");
1845
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1847
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1850
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1852
perror_plus("fexecve");
1853
_exit(EXIT_FAILURE);
1857
perror_plus("fork");
1862
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1863
perror_plus("waitpid");
1867
if(WIFEXITED(status)){
1868
if(WEXITSTATUS(status) != 0){
1869
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1870
" with status %d\n", direntry->d_name,
1871
WEXITSTATUS(status));
1875
} else if(WIFSIGNALED(status)){
1876
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1877
" signal %d\n", direntry->d_name,
1882
fprintf_plus(stderr, "Warning: network hook \"%s\""
1883
" crashed\n", direntry->d_name);
1889
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1895
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1896
perror_plus("close");
1903
__attribute__((nonnull, warn_unused_result))
1904
error_t bring_up_interface(const char *const interface,
1906
error_t old_errno = errno;
1908
struct ifreq network;
1909
unsigned int if_index = if_nametoindex(interface);
1911
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1921
if(not interface_is_up(interface)){
1922
error_t ret_errno = 0, ioctl_errno = 0;
1923
if(not get_flags(interface, &network)){
1925
fprintf_plus(stderr, "Failed to get flags for interface "
1926
"\"%s\"\n", interface);
1930
network.ifr_flags |= IFF_UP; /* set flag */
1932
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1935
perror_plus("socket");
1941
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1943
perror_plus("close");
1950
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1954
/* Raise privileges */
1955
ret_errno = raise_privileges();
1958
perror_plus("Failed to raise privileges");
1963
bool restore_loglevel = false;
1965
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1966
messages about the network interface to mess up the prompt */
1967
ret_linux = klogctl(8, NULL, 5);
1968
if(ret_linux == -1){
1969
perror_plus("klogctl");
1971
restore_loglevel = true;
1974
#endif /* __linux__ */
1975
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1976
ioctl_errno = errno;
1978
if(restore_loglevel){
1979
ret_linux = klogctl(7, NULL, 0);
1980
if(ret_linux == -1){
1981
perror_plus("klogctl");
1984
#endif /* __linux__ */
1986
/* If raise_privileges() succeeded above */
1988
/* Lower privileges */
1989
ret_errno = lower_privileges();
1992
perror_plus("Failed to lower privileges");
1996
/* Close the socket */
1997
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1999
perror_plus("close");
2002
if(ret_setflags == -1){
2003
errno = ioctl_errno;
2004
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2009
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2013
/* Sleep checking until interface is running.
2014
Check every 0.25s, up to total time of delay */
2015
for(int i=0; i < delay * 4; i++){
2016
if(interface_is_running(interface)){
2019
struct timespec sleeptime = { .tv_nsec = 250000000 };
2020
ret = nanosleep(&sleeptime, NULL);
2021
if(ret == -1 and errno != EINTR){
2022
perror_plus("nanosleep");
2030
__attribute__((nonnull, warn_unused_result))
2031
error_t take_down_interface(const char *const interface){
2032
error_t old_errno = errno;
2033
struct ifreq network;
2034
unsigned int if_index = if_nametoindex(interface);
2036
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2040
if(interface_is_up(interface)){
2041
error_t ret_errno = 0, ioctl_errno = 0;
2042
if(not get_flags(interface, &network) and debug){
2044
fprintf_plus(stderr, "Failed to get flags for interface "
2045
"\"%s\"\n", interface);
2049
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2051
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2054
perror_plus("socket");
2060
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2064
/* Raise privileges */
2065
ret_errno = raise_privileges();
2068
perror_plus("Failed to raise privileges");
2071
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2072
ioctl_errno = errno;
2074
/* If raise_privileges() succeeded above */
2076
/* Lower privileges */
2077
ret_errno = lower_privileges();
2080
perror_plus("Failed to lower privileges");
2084
/* Close the socket */
2085
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2087
perror_plus("close");
2090
if(ret_setflags == -1){
2091
errno = ioctl_errno;
2092
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2097
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2105
int main(int argc, char *argv[]){
2106
mandos_context mc = { .server = NULL, .dh_bits = 1024,
2107
.priority = "SECURE256:!CTYPE-X.509:"
2108
"+CTYPE-OPENPGP", .current_server = NULL,
2109
.interfaces = NULL, .interfaces_size = 0 };
2110
AvahiSServiceBrowser *sb = NULL;
751
int ret = asprintf(&tmp, "%s/%s", first, second);
759
int main(int argc, char *argv[]){
760
AvahiSServiceBrowser *sb = NULL;
763
int exitcode = EXIT_SUCCESS;
764
const char *interface = "eth0";
765
struct ifreq network;
769
char *connect_to = NULL;
770
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
771
char *pubkeyfilename = NULL;
772
char *seckeyfilename = NULL;
773
const char *pubkeyname = "pubkey.txt";
774
const char *seckeyname = "seckey.txt";
775
mandos_context mc = { .simple_poll = NULL, .server = NULL,
776
.dh_bits = 1024, .priority = "SECURE256"
777
":!CTYPE-X.509:+CTYPE-OPENPGP" };
778
bool gnutls_initalized = false;
781
struct argp_option options[] = {
782
{ .name = "debug", .key = 128,
783
.doc = "Debug mode", .group = 3 },
784
{ .name = "connect", .key = 'c',
785
.arg = "ADDRESS:PORT",
786
.doc = "Connect directly to a specific Mandos server",
788
{ .name = "interface", .key = 'i',
790
.doc = "Interface that will be used to search for Mandos"
793
{ .name = "keydir", .key = 'd',
795
.doc = "Directory to read the OpenPGP key files from",
797
{ .name = "seckey", .key = 's',
799
.doc = "OpenPGP secret key file base name",
801
{ .name = "pubkey", .key = 'p',
803
.doc = "OpenPGP public key file base name",
805
{ .name = "dh-bits", .key = 129,
807
.doc = "Bit length of the prime number used in the"
808
" Diffie-Hellman key exchange",
810
{ .name = "priority", .key = 130,
812
.doc = "GnuTLS priority string for the TLS handshake",
817
error_t parse_opt (int key, char *arg,
818
struct argp_state *state) {
819
/* Get the INPUT argument from `argp_parse', which we know is
820
a pointer to our plugin list pointer. */
822
case 128: /* --debug */
825
case 'c': /* --connect */
828
case 'i': /* --interface */
831
case 'd': /* --keydir */
834
case 's': /* --seckey */
837
case 'p': /* --pubkey */
840
case 129: /* --dh-bits */
842
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
848
case 130: /* --priority */
856
return ARGP_ERR_UNKNOWN;
861
struct argp argp = { .options = options, .parser = parse_opt,
863
.doc = "Mandos client -- Get and decrypt"
864
" passwords from a Mandos server" };
865
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
866
if (ret == ARGP_ERR_UNKNOWN){
867
fprintf(stderr, "Unknown error while parsing arguments\n");
868
exitcode = EXIT_FAILURE;
873
pubkeyfilename = combinepath(keydir, pubkeyname);
874
if (pubkeyfilename == NULL){
875
perror("combinepath");
876
exitcode = EXIT_FAILURE;
880
seckeyfilename = combinepath(keydir, seckeyname);
881
if (seckeyfilename == NULL){
882
perror("combinepath");
883
exitcode = EXIT_FAILURE;
887
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
889
fprintf(stderr, "init_gnutls_global failed\n");
890
exitcode = EXIT_FAILURE;
893
gnutls_initalized = true;
896
/* If the interface is down, bring it up */
898
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
901
exitcode = EXIT_FAILURE;
904
strcpy(network.ifr_name, interface);
905
ret = ioctl(sd, SIOCGIFFLAGS, &network);
907
perror("ioctl SIOCGIFFLAGS");
908
exitcode = EXIT_FAILURE;
911
if((network.ifr_flags & IFF_UP) == 0){
912
network.ifr_flags |= IFF_UP;
913
ret = ioctl(sd, SIOCSIFFLAGS, &network);
915
perror("ioctl SIOCSIFFLAGS");
916
exitcode = EXIT_FAILURE;
936
if_index = (AvahiIfIndex) if_nametoindex(interface);
938
fprintf(stderr, "No such interface: \"%s\"\n", interface);
942
if(connect_to != NULL){
943
/* Connect directly, do not use Zeroconf */
944
/* (Mainly meant for debugging) */
945
char *address = strrchr(connect_to, ':');
947
fprintf(stderr, "No colon in address\n");
948
exitcode = EXIT_FAILURE;
2115
int exitcode = EXIT_SUCCESS;
2116
char *interfaces_to_take_down = NULL;
2117
size_t interfaces_to_take_down_size = 0;
2118
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2119
char old_tempdir[] = "/tmp/mandosXXXXXX";
2120
char *tempdir = NULL;
2121
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2122
const char *seckey = PATHDIR "/" SECKEY;
2123
const char *pubkey = PATHDIR "/" PUBKEY;
2124
char *interfaces_hooks = NULL;
2126
bool gnutls_initialized = false;
2127
bool gpgme_initialized = false;
2129
double retry_interval = 10; /* 10s between trying a server and
2130
retrying the same server again */
2132
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
2133
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2138
/* Lower any group privileges we might have, just to be safe */
2142
perror_plus("setgid");
2145
/* Lower user privileges (temporarily) */
2149
perror_plus("seteuid");
2157
struct argp_option options[] = {
2158
{ .name = "debug", .key = 128,
2159
.doc = "Debug mode", .group = 3 },
2160
{ .name = "connect", .key = 'c',
2161
.arg = "ADDRESS:PORT",
2162
.doc = "Connect directly to a specific Mandos server",
2164
{ .name = "interface", .key = 'i',
2166
.doc = "Network interface that will be used to search for"
2169
{ .name = "seckey", .key = 's',
2171
.doc = "OpenPGP secret key file base name",
2173
{ .name = "pubkey", .key = 'p',
2175
.doc = "OpenPGP public key file base name",
2177
{ .name = "dh-bits", .key = 129,
2179
.doc = "Bit length of the prime number used in the"
2180
" Diffie-Hellman key exchange",
2182
{ .name = "priority", .key = 130,
2184
.doc = "GnuTLS priority string for the TLS handshake",
2186
{ .name = "delay", .key = 131,
2188
.doc = "Maximum delay to wait for interface startup",
2190
{ .name = "retry", .key = 132,
2192
.doc = "Retry interval used when denied by the Mandos server",
2194
{ .name = "network-hook-dir", .key = 133,
2196
.doc = "Directory where network hooks are located",
2199
* These reproduce what we would get without ARGP_NO_HELP
2201
{ .name = "help", .key = '?',
2202
.doc = "Give this help list", .group = -1 },
2203
{ .name = "usage", .key = -3,
2204
.doc = "Give a short usage message", .group = -1 },
2205
{ .name = "version", .key = 'V',
2206
.doc = "Print program version", .group = -1 },
2210
error_t parse_opt(int key, char *arg,
2211
struct argp_state *state){
952
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
954
perror("Bad port number");
955
exitcode = EXIT_FAILURE;
2214
case 128: /* --debug */
2217
case 'c': /* --connect */
2220
case 'i': /* --interface */
2221
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2224
argp_error(state, "%s", strerror(ret_errno));
2227
case 's': /* --seckey */
2230
case 'p': /* --pubkey */
2233
case 129: /* --dh-bits */
2235
tmpmax = strtoimax(arg, &tmp, 10);
2236
if(errno != 0 or tmp == arg or *tmp != '\0'
2237
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2238
argp_error(state, "Bad number of DH bits");
2240
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2242
case 130: /* --priority */
2245
case 131: /* --delay */
2247
delay = strtof(arg, &tmp);
2248
if(errno != 0 or tmp == arg or *tmp != '\0'){
2249
argp_error(state, "Bad delay");
2251
case 132: /* --retry */
2253
retry_interval = strtod(arg, &tmp);
2254
if(errno != 0 or tmp == arg or *tmp != '\0'
2255
or (retry_interval * 1000) > INT_MAX
2256
or retry_interval < 0){
2257
argp_error(state, "Bad retry interval");
2260
case 133: /* --network-hook-dir */
2264
* These reproduce what we would get without ARGP_NO_HELP
2266
case '?': /* --help */
2267
argp_state_help(state, state->out_stream,
2268
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2269
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2270
case -3: /* --usage */
2271
argp_state_help(state, state->out_stream,
2272
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2273
case 'V': /* --version */
2274
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2275
exit(argp_err_exit_status);
2278
return ARGP_ERR_UNKNOWN;
2283
struct argp argp = { .options = options, .parser = parse_opt,
2285
.doc = "Mandos client -- Get and decrypt"
2286
" passwords from a Mandos server" };
2287
ret = argp_parse(&argp, argc, argv,
2288
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2295
perror_plus("argp_parse");
2296
exitcode = EX_OSERR;
2299
exitcode = EX_USAGE;
2305
/* Work around Debian bug #633582:
2306
<http://bugs.debian.org/633582> */
2308
/* Re-raise privileges */
2309
ret_errno = raise_privileges();
2312
perror_plus("Failed to raise privileges");
2316
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2317
int seckey_fd = open(seckey, O_RDONLY);
2318
if(seckey_fd == -1){
2319
perror_plus("open");
2321
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2323
perror_plus("fstat");
2325
if(S_ISREG(st.st_mode)
2326
and st.st_uid == 0 and st.st_gid == 0){
2327
ret = fchown(seckey_fd, uid, gid);
2329
perror_plus("fchown");
2333
TEMP_FAILURE_RETRY(close(seckey_fd));
2337
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2338
int pubkey_fd = open(pubkey, O_RDONLY);
2339
if(pubkey_fd == -1){
2340
perror_plus("open");
2342
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2344
perror_plus("fstat");
2346
if(S_ISREG(st.st_mode)
2347
and st.st_uid == 0 and st.st_gid == 0){
2348
ret = fchown(pubkey_fd, uid, gid);
2350
perror_plus("fchown");
2354
TEMP_FAILURE_RETRY(close(pubkey_fd));
2358
/* Lower privileges */
2359
ret_errno = lower_privileges();
2362
perror_plus("Failed to lower privileges");
2367
/* Remove invalid interface names (except "none") */
2369
char *interface = NULL;
2370
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2372
if(strcmp(interface, "none") != 0
2373
and if_nametoindex(interface) == 0){
2374
if(interface[0] != '\0'){
2375
fprintf_plus(stderr, "Not using nonexisting interface"
2376
" \"%s\"\n", interface);
2378
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2384
/* Run network hooks */
2386
if(mc.interfaces != NULL){
2387
interfaces_hooks = malloc(mc.interfaces_size);
2388
if(interfaces_hooks == NULL){
2389
perror_plus("malloc");
959
address = connect_to;
960
ret = start_mandos_communication(address, port, if_index, &mc);
962
exitcode = EXIT_FAILURE;
964
exitcode = EXIT_SUCCESS;
970
avahi_set_log_function(empty_log);
973
/* Initialize the pseudo-RNG for Avahi */
974
srand((unsigned int) time(NULL));
976
/* Allocate main Avahi loop object */
977
mc.simple_poll = avahi_simple_poll_new();
978
if (mc.simple_poll == NULL) {
979
fprintf(stderr, "Avahi: Failed to create simple poll"
981
exitcode = EXIT_FAILURE;
986
AvahiServerConfig config;
987
/* Do not publish any local Zeroconf records */
988
avahi_server_config_init(&config);
989
config.publish_hinfo = 0;
990
config.publish_addresses = 0;
991
config.publish_workstation = 0;
992
config.publish_domain = 0;
994
/* Allocate a new server */
995
mc.server = avahi_server_new(avahi_simple_poll_get
996
(mc.simple_poll), &config, NULL,
999
/* Free the Avahi configuration data */
1000
avahi_server_config_free(&config);
1003
/* Check if creating the Avahi server object succeeded */
1004
if (mc.server == NULL) {
1005
fprintf(stderr, "Failed to create Avahi server: %s\n",
1006
avahi_strerror(error));
1007
exitcode = EXIT_FAILURE;
1011
/* Create the Avahi service browser */
1012
sb = avahi_s_service_browser_new(mc.server, if_index,
1014
"_mandos._tcp", NULL, 0,
1015
browse_callback, &mc);
1017
fprintf(stderr, "Failed to create service browser: %s\n",
1018
avahi_strerror(avahi_server_errno(mc.server)));
1019
exitcode = EXIT_FAILURE;
1023
/* Run the main loop */
1026
fprintf(stderr, "Starting Avahi loop search\n");
1029
avahi_simple_poll_loop(mc.simple_poll);
2392
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2393
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2395
run_network_hooks("start", interfaces_hooks != NULL ?
2396
interfaces_hooks : "", delay);
2400
avahi_set_log_function(empty_log);
2403
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2404
from the signal handler */
2405
/* Initialize the pseudo-RNG for Avahi */
2406
srand((unsigned int) time(NULL));
2407
simple_poll = avahi_simple_poll_new();
2408
if(simple_poll == NULL){
2409
fprintf_plus(stderr,
2410
"Avahi: Failed to create simple poll object.\n");
2411
exitcode = EX_UNAVAILABLE;
2415
sigemptyset(&sigterm_action.sa_mask);
2416
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2418
perror_plus("sigaddset");
2419
exitcode = EX_OSERR;
2422
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2424
perror_plus("sigaddset");
2425
exitcode = EX_OSERR;
2428
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2430
perror_plus("sigaddset");
2431
exitcode = EX_OSERR;
2434
/* Need to check if the handler is SIG_IGN before handling:
2435
| [[info:libc:Initial Signal Actions]] |
2436
| [[info:libc:Basic Signal Handling]] |
2438
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2440
perror_plus("sigaction");
2443
if(old_sigterm_action.sa_handler != SIG_IGN){
2444
ret = sigaction(SIGINT, &sigterm_action, NULL);
2446
perror_plus("sigaction");
2447
exitcode = EX_OSERR;
2451
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2453
perror_plus("sigaction");
2456
if(old_sigterm_action.sa_handler != SIG_IGN){
2457
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2459
perror_plus("sigaction");
2460
exitcode = EX_OSERR;
2464
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2466
perror_plus("sigaction");
2469
if(old_sigterm_action.sa_handler != SIG_IGN){
2470
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2472
perror_plus("sigaction");
2473
exitcode = EX_OSERR;
2478
/* If no interfaces were specified, make a list */
2479
if(mc.interfaces == NULL){
2480
struct dirent **direntries = NULL;
2481
/* Look for any good interfaces */
2482
ret = scandir(sys_class_net, &direntries, good_interface,
2485
/* Add all found interfaces to interfaces list */
2486
for(int i = 0; i < ret; ++i){
2487
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2488
direntries[i]->d_name);
2491
perror_plus("argz_add");
2492
free(direntries[i]);
2496
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2497
direntries[i]->d_name);
2499
free(direntries[i]);
2506
fprintf_plus(stderr, "Could not find a network interface\n");
2507
exitcode = EXIT_FAILURE;
2512
/* Bring up interfaces which are down, and remove any "none"s */
2514
char *interface = NULL;
2515
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2517
/* If interface name is "none", stop bringing up interfaces.
2518
Also remove all instances of "none" from the list */
2519
if(strcmp(interface, "none") == 0){
2520
argz_delete(&mc.interfaces, &mc.interfaces_size,
2523
while((interface = argz_next(mc.interfaces,
2524
mc.interfaces_size, interface))){
2525
if(strcmp(interface, "none") == 0){
2526
argz_delete(&mc.interfaces, &mc.interfaces_size,
2533
bool interface_was_up = interface_is_up(interface);
2534
errno = bring_up_interface(interface, delay);
2535
if(not interface_was_up){
2537
perror_plus("Failed to bring up interface");
2539
errno = argz_add(&interfaces_to_take_down,
2540
&interfaces_to_take_down_size,
2543
perror_plus("argz_add");
2548
if(debug and (interfaces_to_take_down == NULL)){
2549
fprintf_plus(stderr, "No interfaces were brought up\n");
2553
/* If we only got one interface, explicitly use only that one */
2554
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2556
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2559
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2566
ret = init_gnutls_global(pubkey, seckey, &mc);
2568
fprintf_plus(stderr, "init_gnutls_global failed\n");
2569
exitcode = EX_UNAVAILABLE;
2572
gnutls_initialized = true;
2579
/* Try /run/tmp before /tmp */
2580
tempdir = mkdtemp(run_tempdir);
2581
if(tempdir == NULL and errno == ENOENT){
2583
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2584
run_tempdir, old_tempdir);
2586
tempdir = mkdtemp(old_tempdir);
2588
if(tempdir == NULL){
2589
perror_plus("mkdtemp");
2597
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2598
fprintf_plus(stderr, "init_gpgme failed\n");
2599
exitcode = EX_UNAVAILABLE;
2602
gpgme_initialized = true;
2609
if(connect_to != NULL){
2610
/* Connect directly, do not use Zeroconf */
2611
/* (Mainly meant for debugging) */
2612
char *address = strrchr(connect_to, ':');
2614
if(address == NULL){
2615
fprintf_plus(stderr, "No colon in address\n");
2616
exitcode = EX_USAGE;
2626
tmpmax = strtoimax(address+1, &tmp, 10);
2627
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2628
or tmpmax != (in_port_t)tmpmax){
2629
fprintf_plus(stderr, "Bad port number\n");
2630
exitcode = EX_USAGE;
2638
port = (in_port_t)tmpmax;
2640
/* Colon in address indicates IPv6 */
2642
if(strchr(connect_to, ':') != NULL){
2644
/* Accept [] around IPv6 address - see RFC 5952 */
2645
if(connect_to[0] == '[' and address[-1] == ']')
2653
address = connect_to;
2659
while(not quit_now){
2660
ret = start_mandos_communication(address, port, if_index, af,
2662
if(quit_now or ret == 0){
2666
fprintf_plus(stderr, "Retrying in %d seconds\n",
2667
(int)retry_interval);
2669
sleep((unsigned int)retry_interval);
2673
exitcode = EXIT_SUCCESS;
2684
AvahiServerConfig config;
2685
/* Do not publish any local Zeroconf records */
2686
avahi_server_config_init(&config);
2687
config.publish_hinfo = 0;
2688
config.publish_addresses = 0;
2689
config.publish_workstation = 0;
2690
config.publish_domain = 0;
2692
/* Allocate a new server */
2693
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2694
&config, NULL, NULL, &ret_errno);
2696
/* Free the Avahi configuration data */
2697
avahi_server_config_free(&config);
2700
/* Check if creating the Avahi server object succeeded */
2701
if(mc.server == NULL){
2702
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2703
avahi_strerror(ret_errno));
2704
exitcode = EX_UNAVAILABLE;
2712
/* Create the Avahi service browser */
2713
sb = avahi_s_service_browser_new(mc.server, if_index,
2714
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2715
NULL, 0, browse_callback,
2718
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2719
avahi_strerror(avahi_server_errno(mc.server)));
2720
exitcode = EX_UNAVAILABLE;
2728
/* Run the main loop */
2731
fprintf_plus(stderr, "Starting Avahi loop search\n");
2734
ret = avahi_loop_with_timeout(simple_poll,
2735
(int)(retry_interval * 1000), &mc);
2737
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2738
(ret == 0) ? "successfully" : "with error");
1034
fprintf(stderr, "%s exiting\n", argv[0]);
1037
/* Cleanup things */
1039
avahi_s_service_browser_free(sb);
1041
if (mc.server != NULL)
1042
avahi_server_free(mc.server);
1044
if (mc.simple_poll != NULL)
1045
avahi_simple_poll_free(mc.simple_poll);
1046
free(pubkeyfilename);
1047
free(seckeyfilename);
1049
if (gnutls_initalized){
1050
gnutls_certificate_free_credentials(mc.cred);
1051
gnutls_global_deinit ();
2744
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2747
/* Cleanup things */
2748
free(mc.interfaces);
2751
avahi_s_service_browser_free(sb);
2753
if(mc.server != NULL)
2754
avahi_server_free(mc.server);
2756
if(simple_poll != NULL)
2757
avahi_simple_poll_free(simple_poll);
2759
if(gnutls_initialized){
2760
gnutls_certificate_free_credentials(mc.cred);
2761
gnutls_global_deinit();
2762
gnutls_dh_params_deinit(mc.dh_params);
2765
if(gpgme_initialized){
2766
gpgme_release(mc.ctx);
2769
/* Cleans up the circular linked list of Mandos servers the client
2771
if(mc.current_server != NULL){
2772
mc.current_server->prev->next = NULL;
2773
while(mc.current_server != NULL){
2774
server *next = mc.current_server->next;
2776
#pragma GCC diagnostic push
2777
#pragma GCC diagnostic ignored "-Wcast-qual"
2779
free((char *)(mc.current_server->ip));
2781
#pragma GCC diagnostic pop
2783
free(mc.current_server);
2784
mc.current_server = next;
2788
/* Re-raise privileges */
2790
ret_errno = raise_privileges();
2793
perror_plus("Failed to raise privileges");
2796
/* Run network hooks */
2797
run_network_hooks("stop", interfaces_hooks != NULL ?
2798
interfaces_hooks : "", delay);
2800
/* Take down the network interfaces which were brought up */
2802
char *interface = NULL;
2803
while((interface=argz_next(interfaces_to_take_down,
2804
interfaces_to_take_down_size,
2806
ret_errno = take_down_interface(interface);
2809
perror_plus("Failed to take down interface");
2812
if(debug and (interfaces_to_take_down == NULL)){
2813
fprintf_plus(stderr, "No interfaces needed to be taken"
2819
ret_errno = lower_privileges_permanently();
2822
perror_plus("Failed to lower privileges permanently");
2826
free(interfaces_to_take_down);
2827
free(interfaces_hooks);
2829
/* Removes the GPGME temp directory and all files inside */
2830
if(tempdir != NULL){
2831
struct dirent **direntries = NULL;
2832
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
2836
if(tempdir_fd == -1){
2837
perror_plus("open");
2840
#if __GLIBC_PREREQ(2, 15)
2841
int numentries = scandirat(tempdir_fd, ".", &direntries,
2842
notdotentries, alphasort);
2843
#else /* not __GLIBC_PREREQ(2, 15) */
2844
int numentries = scandir(tempdir, &direntries, notdotentries,
2846
#endif /* not __GLIBC_PREREQ(2, 15) */
2847
#else /* not __GLIBC__ */
2848
int numentries = scandir(tempdir, &direntries, notdotentries,
2850
#endif /* not __GLIBC__ */
2851
if(numentries >= 0){
2852
for(int i = 0; i < numentries; i++){
2853
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2855
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2856
" \"%s\", 0): %s\n", tempdir,
2857
direntries[i]->d_name, strerror(errno));
2859
free(direntries[i]);
2862
/* need to clean even if 0 because man page doesn't specify */
2864
if(numentries == -1){
2865
perror_plus("scandir");
2867
ret = rmdir(tempdir);
2868
if(ret == -1 and errno != ENOENT){
2869
perror_plus("rmdir");
2872
TEMP_FAILURE_RETRY(close(tempdir_fd));
2877
sigemptyset(&old_sigterm_action.sa_mask);
2878
old_sigterm_action.sa_handler = SIG_DFL;
2879
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2880
&old_sigterm_action,
2883
perror_plus("sigaction");
2886
ret = raise(signal_received);
2887
} while(ret != 0 and errno == EINTR);
2889
perror_plus("raise");
2892
TEMP_FAILURE_RETRY(pause());