111
49
#include <avahi-common/malloc.h>
112
50
#include <avahi-common/error.h>
115
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
118
init_gnutls_session(),
120
#include <gnutls/openpgp.h>
121
/* gnutls_certificate_set_openpgp_key_file(),
122
GNUTLS_OPENPGP_FMT_BASE64 */
52
/* Mandos client part */
53
#include <sys/types.h> /* socket(), inet_pton() */
54
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
55
struct in6_addr, inet_pton() */
56
#include <gnutls/gnutls.h> /* All GnuTLS stuff */
57
#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
59
#include <unistd.h> /* close() */
60
#include <netinet/in.h>
61
#include <stdbool.h> /* true */
62
#include <string.h> /* memset */
63
#include <arpa/inet.h> /* inet_pton() */
64
#include <iso646.h> /* not */
65
#include <net/if.h> /* IF_NAMESIZE */
125
#include <gpgme.h> /* All GPGME types, constants and
128
GPGME_PROTOCOL_OpenPGP,
68
#include <errno.h> /* perror() */
131
74
#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"
76
static const char *keydir = "/conf/conf.d/mandos";
77
static const char *pubkeyfile = "pubkey.txt";
78
static const char *seckeyfile = "seckey.txt";
138
80
bool debug = false;
139
static const char mandos_protocol_version[] = "1";
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;
160
/* Used for passing in values through the Avahi callback functions */
82
/* Used for passing in values through all the callback functions */
84
AvahiSimplePoll *simple_poll;
162
85
AvahiServer *server;
163
86
gnutls_certificate_credentials_t cred;
164
87
unsigned int dh_bits;
165
gnutls_dh_params_t dh_params;
166
88
const char *priority;
92
* Decrypt OpenPGP data using keyrings in HOMEDIR.
95
static ssize_t pgp_packet_decrypt (const char *cryptotext,
99
gpgme_data_t dh_crypto, dh_plain;
168
server *current_server;
170
size_t interfaces_size;
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));
199
* Make additional room in "buffer" for at least BUFFER_SIZE more
200
* bytes. "buffer_capacity" is how much is currently allocated,
201
* "buffer_length" is how much is already used.
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;
216
buffer_capacity += BUFFER_SIZE;
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");
243
free(new_server->ip);
247
/* Special case of first server */
248
if(*current_server == NULL){
249
new_server->next = new_server;
250
new_server->prev = new_server;
251
*current_server = new_server;
253
/* Place the new server last in the list */
254
new_server->next = *current_server;
255
new_server->prev = (*current_server)->prev;
256
new_server->prev->next = new_server;
257
(*current_server)->prev = new_server;
265
__attribute__((nonnull, warn_unused_result))
266
static bool init_gpgme(const char * const seckey,
267
const char * const pubkey,
268
const char * const tempdir,
270
101
gpgme_error_t rc;
103
size_t plaintext_capacity = 0;
104
ssize_t plaintext_length = 0;
271
105
gpgme_engine_info_t engine_info;
274
* Helper function to insert pub and seckey to the engine keyring.
276
bool import_key(const char * const filename){
279
gpgme_data_t pgp_data;
281
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
287
rc = gpgme_data_new_from_fd(&pgp_data, fd);
288
if(rc != GPG_ERR_NO_ERROR){
289
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
290
gpgme_strsource(rc), gpgme_strerror(rc));
294
rc = gpgme_op_import(mc->ctx, pgp_data);
295
if(rc != GPG_ERR_NO_ERROR){
296
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
297
gpgme_strsource(rc), gpgme_strerror(rc));
301
ret = (int)TEMP_FAILURE_RETRY(close(fd));
303
perror_plus("close");
305
gpgme_data_release(pgp_data);
310
fprintf_plus(stderr, "Initializing GPGME\n");
108
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
314
112
gpgme_check_version(NULL);
315
113
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
316
if(rc != GPG_ERR_NO_ERROR){
317
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
318
gpgme_strsource(rc), gpgme_strerror(rc));
114
if (rc != GPG_ERR_NO_ERROR){
115
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
116
gpgme_strsource(rc), gpgme_strerror(rc));
322
120
/* Set GPGME home directory for the OpenPGP engine only */
323
rc = gpgme_get_engine_info(&engine_info);
324
if(rc != GPG_ERR_NO_ERROR){
325
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
326
gpgme_strsource(rc), gpgme_strerror(rc));
121
rc = gpgme_get_engine_info (&engine_info);
122
if (rc != GPG_ERR_NO_ERROR){
123
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
124
gpgme_strsource(rc), gpgme_strerror(rc));
329
127
while(engine_info != NULL){
330
128
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
331
129
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
332
engine_info->file_name, tempdir);
130
engine_info->file_name, homedir);
335
133
engine_info = engine_info->next;
337
135
if(engine_info == NULL){
338
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
343
/* Create new GPGME "context" */
344
rc = gpgme_new(&(mc->ctx));
345
if(rc != GPG_ERR_NO_ERROR){
346
fprintf_plus(stderr, "Mandos plugin mandos-client: "
347
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
352
if(not import_key(pubkey) or not import_key(seckey)){
360
* Decrypt OpenPGP data.
361
* Returns -1 on error
363
__attribute__((nonnull, warn_unused_result))
364
static ssize_t pgp_packet_decrypt(const char *cryptotext,
368
gpgme_data_t dh_crypto, dh_plain;
371
size_t plaintext_capacity = 0;
372
ssize_t plaintext_length = 0;
375
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
136
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
378
140
/* Create new GPGME data buffer from memory cryptotext */
379
141
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
381
if(rc != GPG_ERR_NO_ERROR){
382
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
383
gpgme_strsource(rc), gpgme_strerror(rc));
143
if (rc != GPG_ERR_NO_ERROR){
144
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
145
gpgme_strsource(rc), gpgme_strerror(rc));
387
149
/* Create new empty GPGME data buffer for the plaintext */
388
150
rc = gpgme_data_new(&dh_plain);
389
if(rc != GPG_ERR_NO_ERROR){
390
fprintf_plus(stderr, "Mandos plugin mandos-client: "
391
"bad gpgme_data_new: %s: %s\n",
392
gpgme_strsource(rc), gpgme_strerror(rc));
151
if (rc != GPG_ERR_NO_ERROR){
152
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
153
gpgme_strsource(rc), gpgme_strerror(rc));
393
154
gpgme_data_release(dh_crypto);
158
/* Create new GPGME "context" */
159
rc = gpgme_new(&ctx);
160
if (rc != GPG_ERR_NO_ERROR){
161
fprintf(stderr, "bad gpgme_new: %s: %s\n",
162
gpgme_strsource(rc), gpgme_strerror(rc));
163
plaintext_length = -1;
397
167
/* Decrypt data from the cryptotext data buffer to the plaintext
399
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
400
if(rc != GPG_ERR_NO_ERROR){
401
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
402
gpgme_strsource(rc), gpgme_strerror(rc));
169
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
170
if (rc != GPG_ERR_NO_ERROR){
171
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
172
gpgme_strsource(rc), gpgme_strerror(rc));
403
173
plaintext_length = -1;
405
gpgme_decrypt_result_t result;
406
result = gpgme_op_decrypt_result(mc->ctx);
408
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
410
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
411
result->unsupported_algorithm);
412
fprintf_plus(stderr, "Wrong key usage: %u\n",
413
result->wrong_key_usage);
414
if(result->file_name != NULL){
415
fprintf_plus(stderr, "File name: %s\n", result->file_name);
417
gpgme_recipient_t recipient;
418
recipient = result->recipients;
178
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
182
gpgme_decrypt_result_t result;
183
result = gpgme_op_decrypt_result(ctx);
185
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
187
fprintf(stderr, "Unsupported algorithm: %s\n",
188
result->unsupported_algorithm);
189
fprintf(stderr, "Wrong key usage: %d\n",
190
result->wrong_key_usage);
191
if(result->file_name != NULL){
192
fprintf(stderr, "File name: %s\n", result->file_name);
194
gpgme_recipient_t recipient;
195
recipient = result->recipients;
419
197
while(recipient != NULL){
420
fprintf_plus(stderr, "Public key algorithm: %s\n",
421
gpgme_pubkey_algo_name
422
(recipient->pubkey_algo));
423
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
424
fprintf_plus(stderr, "Secret key available: %s\n",
425
recipient->status == GPG_ERR_NO_SECKEY
198
fprintf(stderr, "Public key algorithm: %s\n",
199
gpgme_pubkey_algo_name(recipient->pubkey_algo));
200
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
201
fprintf(stderr, "Secret key available: %s\n",
202
recipient->status == GPG_ERR_NO_SECKEY
427
204
recipient = recipient->next;
435
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
438
210
/* Seek back to the beginning of the GPGME plaintext data buffer */
439
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
440
perror_plus("gpgme_data_seek");
211
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
212
perror("pgpme_data_seek");
441
213
plaintext_length = -1;
442
214
goto decrypt_end;
445
217
*plaintext = NULL;
447
plaintext_capacity = incbuffer(plaintext,
448
(size_t)plaintext_length,
450
if(plaintext_capacity == 0){
451
perror_plus("incbuffer");
452
plaintext_length = -1;
219
if (plaintext_length + BUFFER_SIZE
220
> (ssize_t) plaintext_capacity){
221
*plaintext = realloc(*plaintext, plaintext_capacity
223
if (*plaintext == NULL){
225
plaintext_length = -1;
228
plaintext_capacity += BUFFER_SIZE;
456
231
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
458
233
/* Print the data, if any */
464
perror_plus("gpgme_data_read");
239
perror("gpgme_data_read");
465
240
plaintext_length = -1;
466
241
goto decrypt_end;
468
243
plaintext_length += ret;
472
fprintf_plus(stderr, "Decrypted password is: ");
247
fprintf(stderr, "Decrypted password is: ");
473
248
for(ssize_t i = 0; i < plaintext_length; i++){
474
249
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
644
378
__attribute__((unused)) const char *txt){}
646
380
/* Called when a Mandos server is found */
647
__attribute__((nonnull, warn_unused_result))
648
static int start_mandos_communication(const char *ip, in_port_t port,
381
static int start_mandos_communication(const char *ip, uint16_t port,
649
382
AvahiIfIndex if_index,
650
int af, mandos_context *mc){
651
int ret, tcp_sd = -1;
653
struct sockaddr_storage to;
385
struct sockaddr_in6 to;
654
386
char *buffer = NULL;
655
char *decrypted_buffer = NULL;
387
char *decrypted_buffer;
656
388
size_t buffer_length = 0;
657
389
size_t buffer_capacity = 0;
390
ssize_t decrypted_buffer_size;
393
char interface[IF_NAMESIZE];
660
394
gnutls_session_t session;
661
int pf; /* Protocol family */
678
fprintf_plus(stderr, "Bad address family: %d\n", af);
683
/* If the interface is specified and we have a list of interfaces */
684
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
685
/* Check if the interface is one of the interfaces we are using */
688
char *interface = NULL;
689
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
691
if(if_nametoindex(interface) == (unsigned int)if_index){
698
/* This interface does not match any in the list, so we don't
699
connect to the server */
701
char interface[IF_NAMESIZE];
702
if(if_indextoname((unsigned int)if_index, interface) == NULL){
703
perror_plus("if_indextoname");
705
fprintf_plus(stderr, "Skipping server on non-used interface"
707
if_indextoname((unsigned int)if_index,
395
gnutls_dh_params_t dh_params;
397
ret = initgnutls (mc, &session, &dh_params);
403
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
407
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
414
if(if_indextoname((unsigned int)if_index, interface) == NULL){
415
perror("if_indextoname");
418
fprintf(stderr, "Binding to interface %s\n", interface);
715
ret = init_gnutls_session(&session, mc);
421
memset(&to,0,sizeof(to)); /* Spurious warning */
422
to.sin6_family = AF_INET6;
423
/* It would be nice to have a way to detect if we were passed an
424
IPv4 address here. Now we assume an IPv6 address. */
425
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
721
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
722
PRIuMAX "\n", ip, (uintmax_t)port);
725
tcp_sd = socket(pf, SOCK_STREAM, 0);
728
perror_plus("socket");
738
memset(&to, 0, sizeof(to));
740
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
741
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
743
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
744
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
748
perror_plus("inet_pton");
754
fprintf_plus(stderr, "Bad address: %s\n", ip);
759
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
760
if(IN6_IS_ADDR_LINKLOCAL
761
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
762
if(if_index == AVAHI_IF_UNSPEC){
763
fprintf_plus(stderr, "An IPv6 link-local address is"
764
" incomplete without a network interface\n");
768
/* Set the network interface number as scope */
769
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
772
((struct sockaddr_in *)&to)->sin_port = htons(port);
781
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
782
char interface[IF_NAMESIZE];
783
if(if_indextoname((unsigned int)if_index, interface) == NULL){
784
perror_plus("if_indextoname");
786
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
787
"\n", ip, interface, (uintmax_t)port);
790
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
791
ip, (uintmax_t)port);
793
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
794
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
796
ret = getnameinfo((struct sockaddr *)&to,
797
sizeof(struct sockaddr_in6),
798
addrstr, sizeof(addrstr), NULL, 0,
801
ret = getnameinfo((struct sockaddr *)&to,
802
sizeof(struct sockaddr_in),
803
addrstr, sizeof(addrstr), NULL, 0,
806
if(ret == EAI_SYSTEM){
807
perror_plus("getnameinfo");
808
} else if(ret != 0) {
809
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
810
} else if(strcmp(addrstr, ip) != 0){
811
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
821
ret = connect(tcp_sd, (struct sockaddr *)&to,
822
sizeof(struct sockaddr_in6));
824
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
825
sizeof(struct sockaddr_in));
828
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
830
perror_plus("connect");
841
const char *out = mandos_protocol_version;
844
size_t out_size = strlen(out);
845
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
846
out_size - written));
849
perror_plus("write");
853
written += (size_t)ret;
854
if(written < out_size){
857
if(out == mandos_protocol_version){
872
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
880
/* This casting via intptr_t is to eliminate warning about casting
881
an int to a pointer type. This is exactly how the GnuTLS Guile
882
function "set-session-transport-fd!" does it. */
883
gnutls_transport_set_ptr(session,
884
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
892
ret = gnutls_handshake(session);
897
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
899
if(ret != GNUTLS_E_SUCCESS){
431
fprintf(stderr, "Bad address: %s\n", ip);
434
to.sin6_port = htons(port); /* Spurious warning */
436
to.sin6_scope_id = (uint32_t)if_index;
439
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
440
char addrstr[INET6_ADDRSTRLEN] = "";
441
if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr,
442
sizeof(addrstr)) == NULL){
445
if(strcmp(addrstr, ip) != 0){
446
fprintf(stderr, "Canonical address form: %s\n", addrstr);
451
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
458
fprintf(stderr, "Establishing TLS session with %s\n", ip);
461
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
463
ret = gnutls_handshake (session);
465
if (ret != GNUTLS_E_SUCCESS){
901
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
467
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
908
474
/* Read OpenPGP packet that contains the wanted password */
911
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
477
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
922
buffer_capacity = incbuffer(&buffer, buffer_length,
924
if(buffer_capacity == 0){
926
perror_plus("incbuffer");
936
sret = gnutls_record_recv(session, buffer+buffer_length,
482
if (buffer_length + BUFFER_SIZE > buffer_capacity){
483
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
489
buffer_capacity += BUFFER_SIZE;
492
ret = gnutls_record_recv(session, buffer+buffer_length,
943
499
case GNUTLS_E_INTERRUPTED:
944
500
case GNUTLS_E_AGAIN:
946
502
case GNUTLS_E_REHANDSHAKE:
948
ret = gnutls_handshake(session);
954
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
956
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
503
ret = gnutls_handshake (session);
505
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
964
fprintf_plus(stderr, "Unknown error while reading data from"
965
" encrypted session with Mandos server\n");
966
gnutls_bye(session, GNUTLS_SHUT_RDWR);
512
fprintf(stderr, "Unknown error while reading data from"
513
" encrypted session with Mandos server\n");
515
gnutls_bye (session, GNUTLS_SHUT_RDWR);
971
buffer_length += (size_t) sret;
519
buffer_length += (size_t) ret;
976
fprintf_plus(stderr, "Closing TLS session\n");
985
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
990
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
992
if(buffer_length > 0){
993
ssize_t decrypted_buffer_size;
994
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
995
&decrypted_buffer, mc);
996
if(decrypted_buffer_size >= 0){
524
fprintf(stderr, "Closing TLS session\n");
527
gnutls_bye (session, GNUTLS_SHUT_RDWR);
529
if (buffer_length > 0){
530
decrypted_buffer_size = pgp_packet_decrypt(buffer,
534
if (decrypted_buffer_size >= 0){
999
535
while(written < (size_t) decrypted_buffer_size){
1005
ret = (int)fwrite(decrypted_buffer + written, 1,
1006
(size_t)decrypted_buffer_size - written,
536
ret = (int)fwrite (decrypted_buffer + written, 1,
537
(size_t)decrypted_buffer_size - written,
1008
539
if(ret == 0 and ferror(stdout)){
1011
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
541
fprintf(stderr, "Error writing encrypted data: %s\n",
1017
547
written += (size_t)ret;
549
free(decrypted_buffer);
1023
555
/* Shutdown procedure */
1028
free(decrypted_buffer);
1031
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1037
perror_plus("close");
1039
gnutls_deinit(session);
560
gnutls_deinit (session);
561
gnutls_certificate_free_credentials (mc->cred);
562
gnutls_global_deinit ();
1049
__attribute__((nonnull))
1050
566
static void resolve_callback(AvahiSServiceResolver *r,
1051
567
AvahiIfIndex interface,
1052
AvahiProtocol proto,
568
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1053
569
AvahiResolverEvent event,
1054
570
const char *name,
1055
571
const char *type,
1163
653
case AVAHI_BROWSER_ALL_FOR_NOW:
1164
654
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1166
fprintf_plus(stderr, "No Mandos server found, still"
656
fprintf(stderr, "No Mandos server found, still searching...\n");
1173
/* Signal handler that stops main loop after SIGTERM */
1174
static void handle_sigterm(int sig){
1179
signal_received = sig;
1180
int old_errno = errno;
1181
/* set main loop to exit */
1182
if(simple_poll != NULL){
1183
avahi_simple_poll_quit(simple_poll);
1188
__attribute__((nonnull, warn_unused_result))
1189
bool get_flags(const char *ifname, struct ifreq *ifr){
1193
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1196
perror_plus("socket");
1200
strcpy(ifr->ifr_name, ifname);
1201
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1205
perror_plus("ioctl SIOCGIFFLAGS");
1213
__attribute__((nonnull, warn_unused_result))
1214
bool good_flags(const char *ifname, const struct ifreq *ifr){
1216
/* Reject the loopback device */
1217
if(ifr->ifr_flags & IFF_LOOPBACK){
1219
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1224
/* Accept point-to-point devices only if connect_to is specified */
1225
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1227
fprintf_plus(stderr, "Accepting point-to-point interface"
1228
" \"%s\"\n", ifname);
1232
/* Otherwise, reject non-broadcast-capable devices */
1233
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1235
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1236
" \"%s\"\n", ifname);
1240
/* Reject non-ARP interfaces (including dummy interfaces) */
1241
if(ifr->ifr_flags & IFF_NOARP){
1243
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1249
/* Accept this device */
1251
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1257
* This function determines if a directory entry in /sys/class/net
1258
* corresponds to an acceptable network device.
1259
* (This function is passed to scandir(3) as a filter function.)
1261
__attribute__((nonnull, warn_unused_result))
1262
int good_interface(const struct dirent *if_entry){
1263
if(if_entry->d_name[0] == '.'){
1268
if(not get_flags(if_entry->d_name, &ifr)){
1270
fprintf_plus(stderr, "Failed to get flags for interface "
1271
"\"%s\"\n", if_entry->d_name);
1276
if(not good_flags(if_entry->d_name, &ifr)){
1283
* This function determines if a network interface is up.
1285
__attribute__((nonnull, warn_unused_result))
1286
bool interface_is_up(const char *interface){
1288
if(not get_flags(interface, &ifr)){
1290
fprintf_plus(stderr, "Failed to get flags for interface "
1291
"\"%s\"\n", interface);
1296
return (bool)(ifr.ifr_flags & IFF_UP);
1300
* This function determines if a network interface is running
1302
__attribute__((nonnull, warn_unused_result))
1303
bool interface_is_running(const char *interface){
1305
if(not get_flags(interface, &ifr)){
1307
fprintf_plus(stderr, "Failed to get flags for interface "
1308
"\"%s\"\n", interface);
1313
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1316
__attribute__((nonnull, pure, warn_unused_result))
1317
int notdotentries(const struct dirent *direntry){
1318
/* Skip "." and ".." */
1319
if(direntry->d_name[0] == '.'
1320
and (direntry->d_name[1] == '\0'
1321
or (direntry->d_name[1] == '.'
1322
and direntry->d_name[2] == '\0'))){
1328
/* Is this directory entry a runnable program? */
1329
__attribute__((nonnull, warn_unused_result))
1330
int runnable_hook(const struct dirent *direntry){
1335
if((direntry->d_name)[0] == '\0'){
1340
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1341
"abcdefghijklmnopqrstuvwxyz"
1344
if((direntry->d_name)[sret] != '\0'){
1345
/* Contains non-allowed characters */
1347
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1353
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1356
perror_plus("Could not stat hook");
1360
if(not (S_ISREG(st.st_mode))){
1361
/* Not a regular file */
1363
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1368
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1369
/* Not executable */
1371
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1377
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1383
__attribute__((nonnull, warn_unused_result))
1384
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1385
mandos_context *mc){
1387
struct timespec now;
1388
struct timespec waited_time;
1389
intmax_t block_time;
1392
if(mc->current_server == NULL){
1394
fprintf_plus(stderr, "Wait until first server is found."
1397
ret = avahi_simple_poll_iterate(s, -1);
1400
fprintf_plus(stderr, "Check current_server if we should run"
1403
/* the current time */
1404
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1406
perror_plus("clock_gettime");
1409
/* Calculating in ms how long time between now and server
1410
who we visted longest time ago. Now - last seen. */
1411
waited_time.tv_sec = (now.tv_sec
1412
- mc->current_server->last_seen.tv_sec);
1413
waited_time.tv_nsec = (now.tv_nsec
1414
- mc->current_server->last_seen.tv_nsec);
1415
/* total time is 10s/10,000ms.
1416
Converting to s from ms by dividing by 1,000,
1417
and ns to ms by dividing by 1,000,000. */
1418
block_time = ((retry_interval
1419
- ((intmax_t)waited_time.tv_sec * 1000))
1420
- ((intmax_t)waited_time.tv_nsec / 1000000));
1423
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1427
if(block_time <= 0){
1428
ret = start_mandos_communication(mc->current_server->ip,
1429
mc->current_server->port,
1430
mc->current_server->if_index,
1431
mc->current_server->af, mc);
1433
avahi_simple_poll_quit(s);
1436
ret = clock_gettime(CLOCK_MONOTONIC,
1437
&mc->current_server->last_seen);
1439
perror_plus("clock_gettime");
1442
mc->current_server = mc->current_server->next;
1443
block_time = 0; /* Call avahi to find new Mandos
1444
servers, but don't block */
1447
ret = avahi_simple_poll_iterate(s, (int)block_time);
1450
if(ret > 0 or errno != EINTR){
1451
return (ret != 1) ? ret : 0;
1457
/* Set effective uid to 0, return errno */
1458
__attribute__((warn_unused_result))
1459
error_t raise_privileges(void){
1460
error_t old_errno = errno;
1461
error_t ret_errno = 0;
1462
if(seteuid(0) == -1){
1469
/* Set effective and real user ID to 0. Return errno. */
1470
__attribute__((warn_unused_result))
1471
error_t raise_privileges_permanently(void){
1472
error_t old_errno = errno;
1473
error_t ret_errno = raise_privileges();
1478
if(setuid(0) == -1){
1485
/* Set effective user ID to unprivileged saved user ID */
1486
__attribute__((warn_unused_result))
1487
error_t lower_privileges(void){
1488
error_t old_errno = errno;
1489
error_t ret_errno = 0;
1490
if(seteuid(uid) == -1){
1497
/* Lower privileges permanently */
1498
__attribute__((warn_unused_result))
1499
error_t lower_privileges_permanently(void){
1500
error_t old_errno = errno;
1501
error_t ret_errno = 0;
1502
if(setuid(uid) == -1){
1509
__attribute__((nonnull))
1510
void run_network_hooks(const char *mode, const char *interface,
1512
struct dirent **direntries = NULL;
1513
if(hookdir_fd == -1){
1514
hookdir_fd = open(hookdir, O_RDONLY);
1515
if(hookdir_fd == -1){
1516
if(errno == ENOENT){
1518
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1519
" found\n", hookdir);
1522
perror_plus("open");
1528
#if __GLIBC_PREREQ(2, 15)
1529
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1530
runnable_hook, alphasort);
1531
#else /* not __GLIBC_PREREQ(2, 15) */
1532
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1534
#endif /* not __GLIBC_PREREQ(2, 15) */
1535
#else /* not __GLIBC__ */
1536
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1538
#endif /* not __GLIBC__ */
1540
perror_plus("scandir");
1543
struct dirent *direntry;
1545
int devnull = open("/dev/null", O_RDONLY);
1546
for(int i = 0; i < numhooks; i++){
1547
direntry = direntries[i];
1549
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1552
pid_t hook_pid = fork();
1555
/* Raise privileges */
1556
errno = raise_privileges_permanently();
1558
perror_plus("Failed to raise privileges");
1565
perror_plus("setgid");
1568
/* Reset supplementary groups */
1570
ret = setgroups(0, NULL);
1572
perror_plus("setgroups");
1575
ret = dup2(devnull, STDIN_FILENO);
1577
perror_plus("dup2(devnull, STDIN_FILENO)");
1580
ret = close(devnull);
1582
perror_plus("close");
1585
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1587
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1590
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1592
perror_plus("setenv");
1595
ret = setenv("DEVICE", interface, 1);
1597
perror_plus("setenv");
1600
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1602
perror_plus("setenv");
1605
ret = setenv("MODE", mode, 1);
1607
perror_plus("setenv");
1611
ret = asprintf(&delaystring, "%f", (double)delay);
1613
perror_plus("asprintf");
1616
ret = setenv("DELAY", delaystring, 1);
1619
perror_plus("setenv");
1623
if(connect_to != NULL){
1624
ret = setenv("CONNECT", connect_to, 1);
1626
perror_plus("setenv");
1630
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1632
perror_plus("openat");
1633
_exit(EXIT_FAILURE);
1635
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1636
perror_plus("close");
1637
_exit(EXIT_FAILURE);
1639
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1641
perror_plus("fexecve");
1642
_exit(EXIT_FAILURE);
1646
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1647
perror_plus("waitpid");
1650
if(WIFEXITED(status)){
1651
if(WEXITSTATUS(status) != 0){
1652
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1653
" with status %d\n", direntry->d_name,
1654
WEXITSTATUS(status));
1657
} else if(WIFSIGNALED(status)){
1658
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1659
" signal %d\n", direntry->d_name,
1663
fprintf_plus(stderr, "Warning: network hook \"%s\""
1664
" crashed\n", direntry->d_name);
1669
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1674
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1675
perror_plus("close");
1682
__attribute__((nonnull, warn_unused_result))
1683
error_t bring_up_interface(const char *const interface,
1685
error_t old_errno = errno;
1687
struct ifreq network;
1688
unsigned int if_index = if_nametoindex(interface);
1690
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1700
if(not interface_is_up(interface)){
1701
error_t ret_errno = 0, ioctl_errno = 0;
1702
if(not get_flags(interface, &network)){
1704
fprintf_plus(stderr, "Failed to get flags for interface "
1705
"\"%s\"\n", interface);
1709
network.ifr_flags |= IFF_UP; /* set flag */
1711
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1714
perror_plus("socket");
1720
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1722
perror_plus("close");
1729
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1733
/* Raise privileges */
1734
ret_errno = raise_privileges();
1737
perror_plus("Failed to raise privileges");
1742
bool restore_loglevel = false;
1744
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1745
messages about the network interface to mess up the prompt */
1746
ret_linux = klogctl(8, NULL, 5);
1747
if(ret_linux == -1){
1748
perror_plus("klogctl");
1750
restore_loglevel = true;
1753
#endif /* __linux__ */
1754
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1755
ioctl_errno = errno;
1757
if(restore_loglevel){
1758
ret_linux = klogctl(7, NULL, 0);
1759
if(ret_linux == -1){
1760
perror_plus("klogctl");
1763
#endif /* __linux__ */
1765
/* If raise_privileges() succeeded above */
1767
/* Lower privileges */
1768
ret_errno = lower_privileges();
1771
perror_plus("Failed to lower privileges");
1775
/* Close the socket */
1776
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1778
perror_plus("close");
1781
if(ret_setflags == -1){
1782
errno = ioctl_errno;
1783
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1788
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1792
/* Sleep checking until interface is running.
1793
Check every 0.25s, up to total time of delay */
1794
for(int i=0; i < delay * 4; i++){
1795
if(interface_is_running(interface)){
1798
struct timespec sleeptime = { .tv_nsec = 250000000 };
1799
ret = nanosleep(&sleeptime, NULL);
1800
if(ret == -1 and errno != EINTR){
1801
perror_plus("nanosleep");
1809
__attribute__((nonnull, warn_unused_result))
1810
error_t take_down_interface(const char *const interface){
1811
error_t old_errno = errno;
1812
struct ifreq network;
1813
unsigned int if_index = if_nametoindex(interface);
1815
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1819
if(interface_is_up(interface)){
1820
error_t ret_errno = 0, ioctl_errno = 0;
1821
if(not get_flags(interface, &network) and debug){
1823
fprintf_plus(stderr, "Failed to get flags for interface "
1824
"\"%s\"\n", interface);
1828
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1830
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1833
perror_plus("socket");
1839
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1843
/* Raise privileges */
1844
ret_errno = raise_privileges();
1847
perror_plus("Failed to raise privileges");
1850
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1851
ioctl_errno = errno;
1853
/* If raise_privileges() succeeded above */
1855
/* Lower privileges */
1856
ret_errno = lower_privileges();
1859
perror_plus("Failed to lower privileges");
1863
/* Close the socket */
1864
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1866
perror_plus("close");
1869
if(ret_setflags == -1){
1870
errno = ioctl_errno;
1871
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1876
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
662
/* Combines file name and path and returns the malloced new
663
string. some sane checks could/should be added */
664
static const char *combinepath(const char *first, const char *second){
665
size_t f_len = strlen(first);
666
size_t s_len = strlen(second);
667
char *tmp = malloc(f_len + s_len + 2);
672
memcpy(tmp, first, f_len); /* Spurious warning */
676
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
678
tmp[f_len + 1 + s_len] = '\0';
1884
683
int main(int argc, char *argv[]){
1885
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1886
.priority = "SECURE256:!CTYPE-X.509:"
1887
"+CTYPE-OPENPGP", .current_server = NULL,
1888
.interfaces = NULL, .interfaces_size = 0 };
1889
AvahiSServiceBrowser *sb = NULL;
1894
int exitcode = EXIT_SUCCESS;
1895
char *interfaces_to_take_down = NULL;
1896
size_t interfaces_to_take_down_size = 0;
1897
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1898
char old_tempdir[] = "/tmp/mandosXXXXXX";
1899
char *tempdir = NULL;
1900
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1901
const char *seckey = PATHDIR "/" SECKEY;
1902
const char *pubkey = PATHDIR "/" PUBKEY;
1903
char *interfaces_hooks = NULL;
1905
bool gnutls_initialized = false;
1906
bool gpgme_initialized = false;
1908
double retry_interval = 10; /* 10s between trying a server and
1909
retrying the same server again */
1911
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1912
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1917
/* Lower any group privileges we might have, just to be safe */
1921
perror_plus("setgid");
1924
/* Lower user privileges (temporarily) */
1928
perror_plus("seteuid");
1936
struct argp_option options[] = {
1937
{ .name = "debug", .key = 128,
1938
.doc = "Debug mode", .group = 3 },
1939
{ .name = "connect", .key = 'c',
1940
.arg = "ADDRESS:PORT",
1941
.doc = "Connect directly to a specific Mandos server",
1943
{ .name = "interface", .key = 'i',
1945
.doc = "Network interface that will be used to search for"
1948
{ .name = "seckey", .key = 's',
1950
.doc = "OpenPGP secret key file base name",
1952
{ .name = "pubkey", .key = 'p',
1954
.doc = "OpenPGP public key file base name",
1956
{ .name = "dh-bits", .key = 129,
1958
.doc = "Bit length of the prime number used in the"
1959
" Diffie-Hellman key exchange",
1961
{ .name = "priority", .key = 130,
1963
.doc = "GnuTLS priority string for the TLS handshake",
1965
{ .name = "delay", .key = 131,
1967
.doc = "Maximum delay to wait for interface startup",
1969
{ .name = "retry", .key = 132,
1971
.doc = "Retry interval used when denied by the Mandos server",
1973
{ .name = "network-hook-dir", .key = 133,
1975
.doc = "Directory where network hooks are located",
1978
* These reproduce what we would get without ARGP_NO_HELP
1980
{ .name = "help", .key = '?',
1981
.doc = "Give this help list", .group = -1 },
1982
{ .name = "usage", .key = -3,
1983
.doc = "Give a short usage message", .group = -1 },
1984
{ .name = "version", .key = 'V',
1985
.doc = "Print program version", .group = -1 },
1989
error_t parse_opt(int key, char *arg,
1990
struct argp_state *state){
1993
case 128: /* --debug */
1996
case 'c': /* --connect */
1999
case 'i': /* --interface */
2000
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2003
argp_error(state, "%s", strerror(ret_errno));
2006
case 's': /* --seckey */
2009
case 'p': /* --pubkey */
2012
case 129: /* --dh-bits */
2014
tmpmax = strtoimax(arg, &tmp, 10);
2015
if(errno != 0 or tmp == arg or *tmp != '\0'
2016
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2017
argp_error(state, "Bad number of DH bits");
2019
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2021
case 130: /* --priority */
2024
case 131: /* --delay */
2026
delay = strtof(arg, &tmp);
2027
if(errno != 0 or tmp == arg or *tmp != '\0'){
2028
argp_error(state, "Bad delay");
2030
case 132: /* --retry */
2032
retry_interval = strtod(arg, &tmp);
2033
if(errno != 0 or tmp == arg or *tmp != '\0'
2034
or (retry_interval * 1000) > INT_MAX
2035
or retry_interval < 0){
2036
argp_error(state, "Bad retry interval");
2039
case 133: /* --network-hook-dir */
2043
* These reproduce what we would get without ARGP_NO_HELP
2045
case '?': /* --help */
2046
argp_state_help(state, state->out_stream,
2047
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2048
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2049
case -3: /* --usage */
2050
argp_state_help(state, state->out_stream,
2051
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2052
case 'V': /* --version */
2053
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2054
exit(argp_err_exit_status);
2057
return ARGP_ERR_UNKNOWN;
2062
struct argp argp = { .options = options, .parser = parse_opt,
2064
.doc = "Mandos client -- Get and decrypt"
2065
" passwords from a Mandos server" };
2066
ret = argp_parse(&argp, argc, argv,
2067
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2074
perror_plus("argp_parse");
2075
exitcode = EX_OSERR;
2078
exitcode = EX_USAGE;
2084
/* Work around Debian bug #633582:
2085
<http://bugs.debian.org/633582> */
2087
/* Re-raise privileges */
2088
ret_errno = raise_privileges();
2091
perror_plus("Failed to raise privileges");
2095
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2096
int seckey_fd = open(seckey, O_RDONLY);
2097
if(seckey_fd == -1){
2098
perror_plus("open");
2100
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2102
perror_plus("fstat");
2104
if(S_ISREG(st.st_mode)
2105
and st.st_uid == 0 and st.st_gid == 0){
2106
ret = fchown(seckey_fd, uid, gid);
2108
perror_plus("fchown");
2112
TEMP_FAILURE_RETRY(close(seckey_fd));
2116
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2117
int pubkey_fd = open(pubkey, O_RDONLY);
2118
if(pubkey_fd == -1){
2119
perror_plus("open");
2121
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2123
perror_plus("fstat");
2125
if(S_ISREG(st.st_mode)
2126
and st.st_uid == 0 and st.st_gid == 0){
2127
ret = fchown(pubkey_fd, uid, gid);
2129
perror_plus("fchown");
2133
TEMP_FAILURE_RETRY(close(pubkey_fd));
2137
/* Lower privileges */
2138
ret_errno = lower_privileges();
2141
perror_plus("Failed to lower privileges");
2146
/* Remove invalid interface names (except "none") */
2148
char *interface = NULL;
2149
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2151
if(strcmp(interface, "none") != 0
2152
and if_nametoindex(interface) == 0){
2153
if(interface[0] != '\0'){
2154
fprintf_plus(stderr, "Not using nonexisting interface"
2155
" \"%s\"\n", interface);
2157
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2163
/* Run network hooks */
2165
if(mc.interfaces != NULL){
2166
interfaces_hooks = malloc(mc.interfaces_size);
2167
if(interfaces_hooks == NULL){
2168
perror_plus("malloc");
2171
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2172
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2174
run_network_hooks("start", interfaces_hooks != NULL ?
2175
interfaces_hooks : "", delay);
2179
avahi_set_log_function(empty_log);
2182
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2183
from the signal handler */
2184
/* Initialize the pseudo-RNG for Avahi */
2185
srand((unsigned int) time(NULL));
2186
simple_poll = avahi_simple_poll_new();
2187
if(simple_poll == NULL){
2188
fprintf_plus(stderr,
2189
"Avahi: Failed to create simple poll object.\n");
2190
exitcode = EX_UNAVAILABLE;
2194
sigemptyset(&sigterm_action.sa_mask);
2195
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2197
perror_plus("sigaddset");
2198
exitcode = EX_OSERR;
2201
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2203
perror_plus("sigaddset");
2204
exitcode = EX_OSERR;
2207
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2209
perror_plus("sigaddset");
2210
exitcode = EX_OSERR;
2213
/* Need to check if the handler is SIG_IGN before handling:
2214
| [[info:libc:Initial Signal Actions]] |
2215
| [[info:libc:Basic Signal Handling]] |
2217
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2219
perror_plus("sigaction");
2222
if(old_sigterm_action.sa_handler != SIG_IGN){
2223
ret = sigaction(SIGINT, &sigterm_action, NULL);
2225
perror_plus("sigaction");
2226
exitcode = EX_OSERR;
2230
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2232
perror_plus("sigaction");
2235
if(old_sigterm_action.sa_handler != SIG_IGN){
2236
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2238
perror_plus("sigaction");
2239
exitcode = EX_OSERR;
2243
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2245
perror_plus("sigaction");
2248
if(old_sigterm_action.sa_handler != SIG_IGN){
2249
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2251
perror_plus("sigaction");
2252
exitcode = EX_OSERR;
2257
/* If no interfaces were specified, make a list */
2258
if(mc.interfaces == NULL){
2259
struct dirent **direntries = NULL;
2260
/* Look for any good interfaces */
2261
ret = scandir(sys_class_net, &direntries, good_interface,
2264
/* Add all found interfaces to interfaces list */
2265
for(int i = 0; i < ret; ++i){
2266
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2267
direntries[i]->d_name);
2270
perror_plus("argz_add");
2274
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2275
direntries[i]->d_name);
2283
fprintf_plus(stderr, "Could not find a network interface\n");
684
AvahiSServiceBrowser *sb = NULL;
687
int exitcode = EXIT_SUCCESS;
688
const char *interface = "eth0";
689
struct ifreq network;
691
char *connect_to = NULL;
692
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
693
mandos_context mc = { .simple_poll = NULL, .server = NULL,
694
.dh_bits = 1024, .priority = "SECURE256"};
697
/* Temporary int to get the address of for getopt_long */
698
int debug_int = debug ? 1 : 0;
700
struct option long_options[] = {
701
{"debug", no_argument, &debug_int, 1},
702
{"connect", required_argument, NULL, 'c'},
703
{"interface", required_argument, NULL, 'i'},
704
{"keydir", required_argument, NULL, 'd'},
705
{"seckey", required_argument, NULL, 's'},
706
{"pubkey", required_argument, NULL, 'p'},
707
{"dh-bits", required_argument, NULL, 'D'},
708
{"priority", required_argument, NULL, 'P'},
711
int option_index = 0;
712
ret = getopt_long (argc, argv, "i:", long_options,
739
mc.dh_bits = (unsigned int) strtol(optarg, NULL, 10);
746
mc.priority = optarg;
750
/* getopt_long() has already printed a message about the
751
unrcognized option, so just exit. */
755
/* Set the global debug flag from the temporary int */
756
debug = debug_int ? true : false;
759
pubkeyfile = combinepath(keydir, pubkeyfile);
760
if (pubkeyfile == NULL){
761
perror("combinepath");
2284
762
exitcode = EXIT_FAILURE;
2289
/* Bring up interfaces which are down, and remove any "none"s */
2291
char *interface = NULL;
2292
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2294
/* If interface name is "none", stop bringing up interfaces.
2295
Also remove all instances of "none" from the list */
2296
if(strcmp(interface, "none") == 0){
2297
argz_delete(&mc.interfaces, &mc.interfaces_size,
2300
while((interface = argz_next(mc.interfaces,
2301
mc.interfaces_size, interface))){
2302
if(strcmp(interface, "none") == 0){
2303
argz_delete(&mc.interfaces, &mc.interfaces_size,
2310
bool interface_was_up = interface_is_up(interface);
2311
errno = bring_up_interface(interface, delay);
2312
if(not interface_was_up){
2314
perror_plus("Failed to bring up interface");
2316
errno = argz_add(&interfaces_to_take_down,
2317
&interfaces_to_take_down_size,
2320
perror_plus("argz_add");
2325
if(debug and (interfaces_to_take_down == NULL)){
2326
fprintf_plus(stderr, "No interfaces were brought up\n");
2330
/* If we only got one interface, explicitly use only that one */
2331
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2333
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2336
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2343
ret = init_gnutls_global(pubkey, seckey, &mc);
2345
fprintf_plus(stderr, "init_gnutls_global failed\n");
2346
exitcode = EX_UNAVAILABLE;
2349
gnutls_initialized = true;
2356
/* Try /run/tmp before /tmp */
2357
tempdir = mkdtemp(run_tempdir);
2358
if(tempdir == NULL and errno == ENOENT){
2360
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2361
run_tempdir, old_tempdir);
2363
tempdir = mkdtemp(old_tempdir);
2365
if(tempdir == NULL){
2366
perror_plus("mkdtemp");
2374
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2375
fprintf_plus(stderr, "init_gpgme failed\n");
2376
exitcode = EX_UNAVAILABLE;
2379
gpgme_initialized = true;
2386
if(connect_to != NULL){
2387
/* Connect directly, do not use Zeroconf */
2388
/* (Mainly meant for debugging) */
2389
char *address = strrchr(connect_to, ':');
2391
if(address == NULL){
2392
fprintf_plus(stderr, "No colon in address\n");
2393
exitcode = EX_USAGE;
2403
tmpmax = strtoimax(address+1, &tmp, 10);
2404
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2405
or tmpmax != (in_port_t)tmpmax){
2406
fprintf_plus(stderr, "Bad port number\n");
2407
exitcode = EX_USAGE;
2415
port = (in_port_t)tmpmax;
2417
/* Colon in address indicates IPv6 */
2419
if(strchr(connect_to, ':') != NULL){
2421
/* Accept [] around IPv6 address - see RFC 5952 */
2422
if(connect_to[0] == '[' and address[-1] == ']')
2430
address = connect_to;
2436
while(not quit_now){
2437
ret = start_mandos_communication(address, port, if_index, af,
2439
if(quit_now or ret == 0){
2443
fprintf_plus(stderr, "Retrying in %d seconds\n",
2444
(int)retry_interval);
2446
sleep((unsigned int)retry_interval);
2450
exitcode = EXIT_SUCCESS;
2461
AvahiServerConfig config;
2462
/* Do not publish any local Zeroconf records */
2463
avahi_server_config_init(&config);
2464
config.publish_hinfo = 0;
2465
config.publish_addresses = 0;
2466
config.publish_workstation = 0;
2467
config.publish_domain = 0;
2469
/* Allocate a new server */
2470
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2471
&config, NULL, NULL, &ret_errno);
2473
/* Free the Avahi configuration data */
2474
avahi_server_config_free(&config);
2477
/* Check if creating the Avahi server object succeeded */
2478
if(mc.server == NULL){
2479
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2480
avahi_strerror(ret_errno));
2481
exitcode = EX_UNAVAILABLE;
2489
/* Create the Avahi service browser */
2490
sb = avahi_s_service_browser_new(mc.server, if_index,
2491
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2492
NULL, 0, browse_callback,
2495
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2496
avahi_strerror(avahi_server_errno(mc.server)));
2497
exitcode = EX_UNAVAILABLE;
2505
/* Run the main loop */
2508
fprintf_plus(stderr, "Starting Avahi loop search\n");
2511
ret = avahi_loop_with_timeout(simple_poll,
2512
(int)(retry_interval * 1000), &mc);
2514
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2515
(ret == 0) ? "successfully" : "with error");
766
seckeyfile = combinepath(keydir, seckeyfile);
767
if (seckeyfile == NULL){
768
perror("combinepath");
772
if_index = (AvahiIfIndex) if_nametoindex(interface);
774
fprintf(stderr, "No such interface: \"%s\"\n", interface);
778
if(connect_to != NULL){
779
/* Connect directly, do not use Zeroconf */
780
/* (Mainly meant for debugging) */
781
char *address = strrchr(connect_to, ':');
783
fprintf(stderr, "No colon in address\n");
787
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
789
perror("Bad port number");
793
address = connect_to;
794
ret = start_mandos_communication(address, port, if_index, &mc);
802
/* If the interface is down, bring it up */
804
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
807
exitcode = EXIT_FAILURE;
810
strcpy(network.ifr_name, interface); /* Spurious warning */
811
ret = ioctl(sd, SIOCGIFFLAGS, &network);
813
perror("ioctl SIOCGIFFLAGS");
814
exitcode = EXIT_FAILURE;
817
if((network.ifr_flags & IFF_UP) == 0){
818
network.ifr_flags |= IFF_UP;
819
ret = ioctl(sd, SIOCSIFFLAGS, &network);
821
perror("ioctl SIOCSIFFLAGS");
822
exitcode = EXIT_FAILURE;
830
avahi_set_log_function(empty_log);
833
/* Initialize the pseudo-RNG for Avahi */
834
srand((unsigned int) time(NULL));
836
/* Allocate main Avahi loop object */
837
mc.simple_poll = avahi_simple_poll_new();
838
if (mc.simple_poll == NULL) {
839
fprintf(stderr, "Avahi: Failed to create simple poll"
841
exitcode = EXIT_FAILURE;
846
AvahiServerConfig config;
847
/* Do not publish any local Zeroconf records */
848
avahi_server_config_init(&config);
849
config.publish_hinfo = 0;
850
config.publish_addresses = 0;
851
config.publish_workstation = 0;
852
config.publish_domain = 0;
854
/* Allocate a new server */
855
mc.server = avahi_server_new(avahi_simple_poll_get
856
(mc.simple_poll), &config, NULL,
859
/* Free the Avahi configuration data */
860
avahi_server_config_free(&config);
863
/* Check if creating the Avahi server object succeeded */
864
if (mc.server == NULL) {
865
fprintf(stderr, "Failed to create Avahi server: %s\n",
866
avahi_strerror(error));
867
exitcode = EXIT_FAILURE;
871
/* Create the Avahi service browser */
872
sb = avahi_s_service_browser_new(mc.server, if_index,
874
"_mandos._tcp", NULL, 0,
875
browse_callback, &mc);
877
fprintf(stderr, "Failed to create service browser: %s\n",
878
avahi_strerror(avahi_server_errno(mc.server)));
879
exitcode = EXIT_FAILURE;
883
/* Run the main loop */
886
fprintf(stderr, "Starting Avahi loop search\n");
889
avahi_simple_poll_loop(mc.simple_poll);
2521
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2524
/* Cleanup things */
2525
free(mc.interfaces);
2528
avahi_s_service_browser_free(sb);
2530
if(mc.server != NULL)
2531
avahi_server_free(mc.server);
2533
if(simple_poll != NULL)
2534
avahi_simple_poll_free(simple_poll);
2536
if(gnutls_initialized){
2537
gnutls_certificate_free_credentials(mc.cred);
2538
gnutls_global_deinit();
2539
gnutls_dh_params_deinit(mc.dh_params);
2542
if(gpgme_initialized){
2543
gpgme_release(mc.ctx);
2546
/* Cleans up the circular linked list of Mandos servers the client
2548
if(mc.current_server != NULL){
2549
mc.current_server->prev->next = NULL;
2550
while(mc.current_server != NULL){
2551
server *next = mc.current_server->next;
2552
free(mc.current_server);
2553
mc.current_server = next;
2557
/* Re-raise privileges */
2559
ret_errno = raise_privileges();
2562
perror_plus("Failed to raise privileges");
2565
/* Run network hooks */
2566
run_network_hooks("stop", interfaces_hooks != NULL ?
2567
interfaces_hooks : "", delay);
2569
/* Take down the network interfaces which were brought up */
2571
char *interface = NULL;
2572
while((interface=argz_next(interfaces_to_take_down,
2573
interfaces_to_take_down_size,
2575
ret_errno = take_down_interface(interface);
2578
perror_plus("Failed to take down interface");
2581
if(debug and (interfaces_to_take_down == NULL)){
2582
fprintf_plus(stderr, "No interfaces needed to be taken"
2588
ret_errno = lower_privileges_permanently();
2591
perror_plus("Failed to lower privileges permanently");
2595
free(interfaces_to_take_down);
2596
free(interfaces_hooks);
2598
/* Removes the GPGME temp directory and all files inside */
2599
if(tempdir != NULL){
2600
struct dirent **direntries = NULL;
2601
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2603
if(tempdir_fd == -1){
2604
perror_plus("open");
2607
#if __GLIBC_PREREQ(2, 15)
2608
int numentries = scandirat(tempdir_fd, ".", &direntries,
2609
notdotentries, alphasort);
2610
#else /* not __GLIBC_PREREQ(2, 15) */
2611
int numentries = scandir(tempdir, &direntries, notdotentries,
2613
#endif /* not __GLIBC_PREREQ(2, 15) */
2614
#else /* not __GLIBC__ */
2615
int numentries = scandir(tempdir, &direntries, notdotentries,
2617
#endif /* not __GLIBC__ */
2618
if(numentries >= 0){
2619
for(int i = 0; i < numentries; i++){
2620
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2622
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2623
" \"%s\", 0): %s\n", tempdir,
2624
direntries[i]->d_name, strerror(errno));
2628
/* need to clean even if 0 because man page doesn't specify */
2630
if(numentries == -1){
2631
perror_plus("scandir");
2633
ret = rmdir(tempdir);
2634
if(ret == -1 and errno != ENOENT){
2635
perror_plus("rmdir");
2638
TEMP_FAILURE_RETRY(close(tempdir_fd));
2643
sigemptyset(&old_sigterm_action.sa_mask);
2644
old_sigterm_action.sa_handler = SIG_DFL;
2645
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2646
&old_sigterm_action,
2649
perror_plus("sigaction");
2652
ret = raise(signal_received);
2653
} while(ret != 0 and errno == EINTR);
2655
perror_plus("raise");
2658
TEMP_FAILURE_RETRY(pause());
894
fprintf(stderr, "%s exiting\n", argv[0]);
899
avahi_s_service_browser_free(sb);
901
if (mc.server != NULL)
902
avahi_server_free(mc.server);
904
if (mc.simple_poll != NULL)
905
avahi_simple_poll_free(mc.simple_poll);