110
51
#include <avahi-common/malloc.h>
111
52
#include <avahi-common/error.h>
114
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
117
init_gnutls_session(),
119
#include <gnutls/openpgp.h>
120
/* gnutls_certificate_set_openpgp_key_file(),
121
GNUTLS_OPENPGP_FMT_BASE64 */
54
/* Mandos client part */
55
#include <sys/types.h> /* socket(), inet_pton() */
56
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
57
struct in6_addr, inet_pton() */
58
#include <gnutls/gnutls.h> /* All GnuTLS stuff */
59
#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
61
#include <unistd.h> /* close() */
62
#include <netinet/in.h>
63
#include <stdbool.h> /* true */
64
#include <string.h> /* memset */
65
#include <arpa/inet.h> /* inet_pton() */
66
#include <iso646.h> /* not */
67
#include <net/if.h> /* IF_NAMESIZE */
68
#include <argp.h> /* struct argp_option,
69
struct argp_state, struct argp,
124
#include <gpgme.h> /* All GPGME types, constants and
127
GPGME_PROTOCOL_OpenPGP,
72
#include <errno.h> /* perror() */
130
75
#define BUFFER_SIZE 256
132
#define PATHDIR "/conf/conf.d/mandos"
133
#define SECKEY "seckey.txt"
134
#define PUBKEY "pubkey.txt"
135
#define HOOKDIR "/lib/mandos/network-hooks.d"
137
77
bool debug = false;
138
static const char mandos_protocol_version[] = "1";
139
const char *argp_program_version = "mandos-client " VERSION;
140
const char *argp_program_bug_address = "<mandos@recompile.se>";
141
static const char sys_class_net[] = "/sys/class/net";
142
char *connect_to = NULL;
143
const char *hookdir = HOOKDIR;
147
/* Doubly linked list that need to be circularly linked when used */
148
typedef struct server{
151
AvahiIfIndex if_index;
153
struct timespec last_seen;
158
/* Used for passing in values through the Avahi callback functions */
78
const char *keydir = "/conf/conf.d/mandos";
79
const char *argp_program_version = "mandosclient 0.9";
80
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
81
const char mandos_protocol_version[] = "1";
83
/* Used for passing in values through all the callback functions */
85
AvahiSimplePoll *simple_poll;
160
86
AvahiServer *server;
161
87
gnutls_certificate_credentials_t cred;
162
88
unsigned int dh_bits;
163
89
gnutls_dh_params_t dh_params;
164
90
const char *priority;
166
server *current_server;
168
size_t interfaces_size;
171
/* global so signal handler can reach it*/
172
AvahiSimplePoll *simple_poll;
174
sig_atomic_t quit_now = 0;
175
int signal_received = 0;
177
/* Function to use when printing errors */
178
void perror_plus(const char *print_text){
180
fprintf(stderr, "Mandos plugin %s: ",
181
program_invocation_short_name);
186
__attribute__((format (gnu_printf, 2, 3), nonnull))
187
int fprintf_plus(FILE *stream, const char *format, ...){
189
va_start (ap, format);
191
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
192
program_invocation_short_name));
193
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
197
* Make additional room in "buffer" for at least BUFFER_SIZE more
198
* bytes. "buffer_capacity" is how much is currently allocated,
199
* "buffer_length" is how much is already used.
201
__attribute__((nonnull, warn_unused_result))
202
size_t incbuffer(char **buffer, size_t buffer_length,
203
size_t buffer_capacity){
204
if(buffer_length + BUFFER_SIZE > buffer_capacity){
205
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
207
int old_errno = errno;
93
size_t adjustbuffer(char **buffer, size_t buffer_length,
94
size_t buffer_capacity){
95
if (buffer_length + BUFFER_SIZE > buffer_capacity){
96
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
214
100
buffer_capacity += BUFFER_SIZE;
216
102
return buffer_capacity;
219
/* Add server to set of servers to retry periodically */
220
__attribute__((nonnull, warn_unused_result))
221
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
222
int af, server **current_server){
224
server *new_server = malloc(sizeof(server));
225
if(new_server == NULL){
226
perror_plus("malloc");
229
*new_server = (server){ .ip = strdup(ip),
231
.if_index = if_index,
233
if(new_server->ip == NULL){
234
perror_plus("strdup");
237
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
239
perror_plus("clock_gettime");
242
/* Special case of first server */
243
if(*current_server == NULL){
244
new_server->next = new_server;
245
new_server->prev = new_server;
246
*current_server = new_server;
248
/* Place the new server last in the list */
249
new_server->next = *current_server;
250
new_server->prev = (*current_server)->prev;
251
new_server->prev->next = new_server;
252
(*current_server)->prev = new_server;
106
* Decrypt OpenPGP data using keyrings in HOMEDIR.
107
* Returns -1 on error
260
__attribute__((nonnull, warn_unused_result))
261
static bool init_gpgme(const char * const seckey,
262
const char * const pubkey,
263
const char * const tempdir,
109
static ssize_t pgp_packet_decrypt (const char *cryptotext,
112
const char *homedir){
113
gpgme_data_t dh_crypto, dh_plain;
265
115
gpgme_error_t rc;
117
size_t plaintext_capacity = 0;
118
ssize_t plaintext_length = 0;
266
119
gpgme_engine_info_t engine_info;
269
* Helper function to insert pub and seckey to the engine keyring.
271
bool import_key(const char * const filename){
274
gpgme_data_t pgp_data;
276
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
282
rc = gpgme_data_new_from_fd(&pgp_data, fd);
283
if(rc != GPG_ERR_NO_ERROR){
284
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
285
gpgme_strsource(rc), gpgme_strerror(rc));
289
rc = gpgme_op_import(mc->ctx, pgp_data);
290
if(rc != GPG_ERR_NO_ERROR){
291
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
292
gpgme_strsource(rc), gpgme_strerror(rc));
296
ret = (int)TEMP_FAILURE_RETRY(close(fd));
298
perror_plus("close");
300
gpgme_data_release(pgp_data);
305
fprintf_plus(stderr, "Initializing GPGME\n");
122
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
309
126
gpgme_check_version(NULL);
310
127
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
311
if(rc != GPG_ERR_NO_ERROR){
312
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
313
gpgme_strsource(rc), gpgme_strerror(rc));
128
if (rc != GPG_ERR_NO_ERROR){
129
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
130
gpgme_strsource(rc), gpgme_strerror(rc));
317
134
/* Set GPGME home directory for the OpenPGP engine only */
318
rc = gpgme_get_engine_info(&engine_info);
319
if(rc != GPG_ERR_NO_ERROR){
320
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
321
gpgme_strsource(rc), gpgme_strerror(rc));
135
rc = gpgme_get_engine_info (&engine_info);
136
if (rc != GPG_ERR_NO_ERROR){
137
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
138
gpgme_strsource(rc), gpgme_strerror(rc));
324
141
while(engine_info != NULL){
325
142
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
326
143
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
327
engine_info->file_name, tempdir);
144
engine_info->file_name, homedir);
330
147
engine_info = engine_info->next;
332
149
if(engine_info == NULL){
333
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
338
/* Create new GPGME "context" */
339
rc = gpgme_new(&(mc->ctx));
340
if(rc != GPG_ERR_NO_ERROR){
341
fprintf_plus(stderr, "Mandos plugin mandos-client: "
342
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
347
if(not import_key(pubkey) or not import_key(seckey)){
355
* Decrypt OpenPGP data.
356
* Returns -1 on error
358
__attribute__((nonnull, warn_unused_result))
359
static ssize_t pgp_packet_decrypt(const char *cryptotext,
363
gpgme_data_t dh_crypto, dh_plain;
366
size_t plaintext_capacity = 0;
367
ssize_t plaintext_length = 0;
370
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
150
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
373
154
/* Create new GPGME data buffer from memory cryptotext */
374
155
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
376
if(rc != GPG_ERR_NO_ERROR){
377
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
378
gpgme_strsource(rc), gpgme_strerror(rc));
157
if (rc != GPG_ERR_NO_ERROR){
158
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
159
gpgme_strsource(rc), gpgme_strerror(rc));
382
163
/* Create new empty GPGME data buffer for the plaintext */
383
164
rc = gpgme_data_new(&dh_plain);
384
if(rc != GPG_ERR_NO_ERROR){
385
fprintf_plus(stderr, "Mandos plugin mandos-client: "
386
"bad gpgme_data_new: %s: %s\n",
387
gpgme_strsource(rc), gpgme_strerror(rc));
165
if (rc != GPG_ERR_NO_ERROR){
166
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
167
gpgme_strsource(rc), gpgme_strerror(rc));
388
168
gpgme_data_release(dh_crypto);
172
/* Create new GPGME "context" */
173
rc = gpgme_new(&ctx);
174
if (rc != GPG_ERR_NO_ERROR){
175
fprintf(stderr, "bad gpgme_new: %s: %s\n",
176
gpgme_strsource(rc), gpgme_strerror(rc));
177
plaintext_length = -1;
392
181
/* Decrypt data from the cryptotext data buffer to the plaintext
394
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
395
if(rc != GPG_ERR_NO_ERROR){
396
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
397
gpgme_strsource(rc), gpgme_strerror(rc));
183
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
184
if (rc != GPG_ERR_NO_ERROR){
185
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
186
gpgme_strsource(rc), gpgme_strerror(rc));
398
187
plaintext_length = -1;
400
gpgme_decrypt_result_t result;
401
result = gpgme_op_decrypt_result(mc->ctx);
403
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
405
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
406
result->unsupported_algorithm);
407
fprintf_plus(stderr, "Wrong key usage: %u\n",
408
result->wrong_key_usage);
409
if(result->file_name != NULL){
410
fprintf_plus(stderr, "File name: %s\n", result->file_name);
412
gpgme_recipient_t recipient;
413
recipient = result->recipients;
192
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
196
gpgme_decrypt_result_t result;
197
result = gpgme_op_decrypt_result(ctx);
199
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
201
fprintf(stderr, "Unsupported algorithm: %s\n",
202
result->unsupported_algorithm);
203
fprintf(stderr, "Wrong key usage: %d\n",
204
result->wrong_key_usage);
205
if(result->file_name != NULL){
206
fprintf(stderr, "File name: %s\n", result->file_name);
208
gpgme_recipient_t recipient;
209
recipient = result->recipients;
414
211
while(recipient != NULL){
415
fprintf_plus(stderr, "Public key algorithm: %s\n",
416
gpgme_pubkey_algo_name
417
(recipient->pubkey_algo));
418
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
419
fprintf_plus(stderr, "Secret key available: %s\n",
420
recipient->status == GPG_ERR_NO_SECKEY
212
fprintf(stderr, "Public key algorithm: %s\n",
213
gpgme_pubkey_algo_name(recipient->pubkey_algo));
214
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
215
fprintf(stderr, "Secret key available: %s\n",
216
recipient->status == GPG_ERR_NO_SECKEY
422
218
recipient = recipient->next;
430
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
433
224
/* Seek back to the beginning of the GPGME plaintext data buffer */
434
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
435
perror_plus("gpgme_data_seek");
225
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
226
perror("pgpme_data_seek");
436
227
plaintext_length = -1;
437
228
goto decrypt_end;
440
231
*plaintext = NULL;
442
plaintext_capacity = incbuffer(plaintext,
443
(size_t)plaintext_length,
445
if(plaintext_capacity == 0){
446
perror_plus("incbuffer");
447
plaintext_length = -1;
233
plaintext_capacity = adjustbuffer(plaintext, (size_t)plaintext_length,
235
if (plaintext_capacity == 0){
236
perror("adjustbuffer");
237
plaintext_length = -1;
451
241
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
453
243
/* Print the data, if any */
459
perror_plus("gpgme_data_read");
249
perror("gpgme_data_read");
460
250
plaintext_length = -1;
461
251
goto decrypt_end;
463
253
plaintext_length += ret;
467
fprintf_plus(stderr, "Decrypted password is: ");
257
fprintf(stderr, "Decrypted password is: ");
468
258
for(ssize_t i = 0; i < plaintext_length; i++){
469
259
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
639
394
__attribute__((unused)) const char *txt){}
641
396
/* Called when a Mandos server is found */
642
__attribute__((nonnull, warn_unused_result))
643
static int start_mandos_communication(const char *ip, in_port_t port,
397
static int start_mandos_communication(const char *ip, uint16_t port,
644
398
AvahiIfIndex if_index,
645
int af, mandos_context *mc){
646
int ret, tcp_sd = -1;
648
struct sockaddr_storage to;
401
struct sockaddr_in6 to;
649
402
char *buffer = NULL;
650
char *decrypted_buffer = NULL;
403
char *decrypted_buffer;
651
404
size_t buffer_length = 0;
652
405
size_t buffer_capacity = 0;
406
ssize_t decrypted_buffer_size;
409
char interface[IF_NAMESIZE];
655
410
gnutls_session_t session;
656
int pf; /* Protocol family */
673
fprintf_plus(stderr, "Bad address family: %d\n", af);
678
/* If the interface is specified and we have a list of interfaces */
679
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
680
/* Check if the interface is one of the interfaces we are using */
683
char *interface = NULL;
684
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
686
if(if_nametoindex(interface) == (unsigned int)if_index){
693
/* This interface does not match any in the list, so we don't
694
connect to the server */
696
char interface[IF_NAMESIZE];
697
if(if_indextoname((unsigned int)if_index, interface) == NULL){
698
perror_plus("if_indextoname");
700
fprintf_plus(stderr, "Skipping server on non-used interface"
702
if_indextoname((unsigned int)if_index,
411
gnutls_dh_params_t dh_params;
413
ret = init_gnutls_session (mc, &session);
419
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
423
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
430
if(if_indextoname((unsigned int)if_index, interface) == NULL){
431
perror("if_indextoname");
434
fprintf(stderr, "Binding to interface %s\n", interface);
710
ret = init_gnutls_session(&session, mc);
437
memset(&to,0,sizeof(to)); /* Spurious warning */
438
to.sin6_family = AF_INET6;
439
/* It would be nice to have a way to detect if we were passed an
440
IPv4 address here. Now we assume an IPv6 address. */
441
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
716
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
717
PRIuMAX "\n", ip, (uintmax_t)port);
720
tcp_sd = socket(pf, SOCK_STREAM, 0);
723
perror_plus("socket");
733
memset(&to, 0, sizeof(to));
735
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
736
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
738
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
739
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
743
perror_plus("inet_pton");
749
fprintf_plus(stderr, "Bad address: %s\n", ip);
754
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
755
if(IN6_IS_ADDR_LINKLOCAL
756
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
757
if(if_index == AVAHI_IF_UNSPEC){
758
fprintf_plus(stderr, "An IPv6 link-local address is"
759
" incomplete without a network interface\n");
763
/* Set the network interface number as scope */
764
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
767
((struct sockaddr_in *)&to)->sin_port = htons(port);
447
fprintf(stderr, "Bad address: %s\n", ip);
450
to.sin6_port = htons(port); /* Spurious warning */
452
to.sin6_scope_id = (uint32_t)if_index;
776
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
777
char interface[IF_NAMESIZE];
778
if(if_indextoname((unsigned int)if_index, interface) == NULL){
779
perror_plus("if_indextoname");
781
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
782
"\n", ip, interface, (uintmax_t)port);
455
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
456
char addrstr[INET6_ADDRSTRLEN] = "";
457
if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr,
458
sizeof(addrstr)) == NULL){
461
if(strcmp(addrstr, ip) != 0){
462
fprintf(stderr, "Canonical address form: %s\n", addrstr);
785
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
786
ip, (uintmax_t)port);
788
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
789
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
791
ret = getnameinfo((struct sockaddr *)&to,
792
sizeof(struct sockaddr_in6),
793
addrstr, sizeof(addrstr), NULL, 0,
796
ret = getnameinfo((struct sockaddr *)&to,
797
sizeof(struct sockaddr_in),
798
addrstr, sizeof(addrstr), NULL, 0,
801
if(ret == EAI_SYSTEM){
802
perror_plus("getnameinfo");
803
} else if(ret != 0) {
804
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
805
} else if(strcmp(addrstr, ip) != 0){
806
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
816
ret = connect(tcp_sd, (struct sockaddr *)&to,
817
sizeof(struct sockaddr_in6));
819
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
820
sizeof(struct sockaddr_in));
823
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
825
perror_plus("connect");
467
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
836
473
const char *out = mandos_protocol_version;
839
476
size_t out_size = strlen(out);
840
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
841
out_size - written));
844
perror_plus("write");
477
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
478
out_size - written));
848
484
written += (size_t)ret;
849
485
if(written < out_size){
852
if(out == mandos_protocol_version){
488
if (out == mandos_protocol_version){
867
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
875
/* This casting via intptr_t is to eliminate warning about casting
876
an int to a pointer type. This is exactly how the GnuTLS Guile
877
function "set-session-transport-fd!" does it. */
878
gnutls_transport_set_ptr(session,
879
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
887
ret = gnutls_handshake(session);
892
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
894
if(ret != GNUTLS_E_SUCCESS){
498
fprintf(stderr, "Establishing TLS session with %s\n", ip);
501
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
503
ret = gnutls_handshake (session);
505
if (ret != GNUTLS_E_SUCCESS){
896
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
507
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
903
514
/* Read OpenPGP packet that contains the wanted password */
906
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
517
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
917
buffer_capacity = incbuffer(&buffer, buffer_length,
919
if(buffer_capacity == 0){
921
perror_plus("incbuffer");
931
sret = gnutls_record_recv(session, buffer+buffer_length,
522
buffer_capacity = adjustbuffer(&buffer, buffer_length, buffer_capacity);
523
if (buffer_capacity == 0){
524
perror("adjustbuffer");
529
ret = gnutls_record_recv(session, buffer+buffer_length,
938
536
case GNUTLS_E_INTERRUPTED:
939
537
case GNUTLS_E_AGAIN:
941
539
case GNUTLS_E_REHANDSHAKE:
943
ret = gnutls_handshake(session);
949
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
951
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
540
ret = gnutls_handshake (session);
542
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
959
fprintf_plus(stderr, "Unknown error while reading data from"
960
" encrypted session with Mandos server\n");
961
gnutls_bye(session, GNUTLS_SHUT_RDWR);
549
fprintf(stderr, "Unknown error while reading data from"
550
" encrypted session with Mandos server\n");
552
gnutls_bye (session, GNUTLS_SHUT_RDWR);
966
buffer_length += (size_t) sret;
556
buffer_length += (size_t) ret;
971
fprintf_plus(stderr, "Closing TLS session\n");
980
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
985
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
987
if(buffer_length > 0){
988
ssize_t decrypted_buffer_size;
989
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
990
&decrypted_buffer, mc);
991
if(decrypted_buffer_size >= 0){
561
fprintf(stderr, "Closing TLS session\n");
564
gnutls_bye (session, GNUTLS_SHUT_RDWR);
566
if (buffer_length > 0){
567
decrypted_buffer_size = pgp_packet_decrypt(buffer,
571
if (decrypted_buffer_size >= 0){
994
573
while(written < (size_t) decrypted_buffer_size){
1000
ret = (int)fwrite(decrypted_buffer + written, 1,
1001
(size_t)decrypted_buffer_size - written,
574
ret = (int)fwrite (decrypted_buffer + written, 1,
575
(size_t)decrypted_buffer_size - written,
1003
577
if(ret == 0 and ferror(stdout)){
1006
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
579
fprintf(stderr, "Error writing encrypted data: %s\n",
1012
585
written += (size_t)ret;
587
free(decrypted_buffer);
1018
593
/* Shutdown procedure */
1023
free(decrypted_buffer);
1026
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1032
perror_plus("close");
1034
gnutls_deinit(session);
598
gnutls_deinit (session);
599
gnutls_certificate_free_credentials (mc->cred);
600
gnutls_global_deinit ();
1044
__attribute__((nonnull))
1045
604
static void resolve_callback(AvahiSServiceResolver *r,
1046
605
AvahiIfIndex interface,
1047
AvahiProtocol proto,
606
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1048
607
AvahiResolverEvent event,
1049
608
const char *name,
1050
609
const char *type,
1158
691
case AVAHI_BROWSER_ALL_FOR_NOW:
1159
692
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1161
fprintf_plus(stderr, "No Mandos server found, still"
694
fprintf(stderr, "No Mandos server found, still searching...\n");
1168
/* Signal handler that stops main loop after SIGTERM */
1169
static void handle_sigterm(int sig){
1174
signal_received = sig;
1175
int old_errno = errno;
1176
/* set main loop to exit */
1177
if(simple_poll != NULL){
1178
avahi_simple_poll_quit(simple_poll);
1183
__attribute__((nonnull, warn_unused_result))
1184
bool get_flags(const char *ifname, struct ifreq *ifr){
1188
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1191
perror_plus("socket");
1195
strcpy(ifr->ifr_name, ifname);
1196
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1200
perror_plus("ioctl SIOCGIFFLAGS");
1208
__attribute__((nonnull, warn_unused_result))
1209
bool good_flags(const char *ifname, const struct ifreq *ifr){
1211
/* Reject the loopback device */
1212
if(ifr->ifr_flags & IFF_LOOPBACK){
1214
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1219
/* Accept point-to-point devices only if connect_to is specified */
1220
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1222
fprintf_plus(stderr, "Accepting point-to-point interface"
1223
" \"%s\"\n", ifname);
1227
/* Otherwise, reject non-broadcast-capable devices */
1228
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1230
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1231
" \"%s\"\n", ifname);
1235
/* Reject non-ARP interfaces (including dummy interfaces) */
1236
if(ifr->ifr_flags & IFF_NOARP){
1238
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1244
/* Accept this device */
1246
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1252
* This function determines if a directory entry in /sys/class/net
1253
* corresponds to an acceptable network device.
1254
* (This function is passed to scandir(3) as a filter function.)
1256
__attribute__((nonnull, warn_unused_result))
1257
int good_interface(const struct dirent *if_entry){
1258
if(if_entry->d_name[0] == '.'){
1263
if(not get_flags(if_entry->d_name, &ifr)){
1265
fprintf_plus(stderr, "Failed to get flags for interface "
1266
"\"%s\"\n", if_entry->d_name);
1271
if(not good_flags(if_entry->d_name, &ifr)){
1278
* This function determines if a network interface is up.
1280
__attribute__((nonnull, warn_unused_result))
1281
bool interface_is_up(const char *interface){
1283
if(not get_flags(interface, &ifr)){
1285
fprintf_plus(stderr, "Failed to get flags for interface "
1286
"\"%s\"\n", interface);
1291
return (bool)(ifr.ifr_flags & IFF_UP);
1295
* This function determines if a network interface is running
1297
__attribute__((nonnull, warn_unused_result))
1298
bool interface_is_running(const char *interface){
1300
if(not get_flags(interface, &ifr)){
1302
fprintf_plus(stderr, "Failed to get flags for interface "
1303
"\"%s\"\n", interface);
1308
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1311
__attribute__((nonnull, pure, warn_unused_result))
1312
int notdotentries(const struct dirent *direntry){
1313
/* Skip "." and ".." */
1314
if(direntry->d_name[0] == '.'
1315
and (direntry->d_name[1] == '\0'
1316
or (direntry->d_name[1] == '.'
1317
and direntry->d_name[2] == '\0'))){
1323
/* Is this directory entry a runnable program? */
1324
__attribute__((nonnull, warn_unused_result))
1325
int runnable_hook(const struct dirent *direntry){
1330
if((direntry->d_name)[0] == '\0'){
1335
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1336
"abcdefghijklmnopqrstuvwxyz"
1339
if((direntry->d_name)[sret] != '\0'){
1340
/* Contains non-allowed characters */
1342
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1348
char *fullname = NULL;
1349
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1351
perror_plus("asprintf");
1355
ret = stat(fullname, &st);
1358
perror_plus("Could not stat hook");
1362
if(not (S_ISREG(st.st_mode))){
1363
/* Not a regular file */
1365
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1370
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1371
/* Not executable */
1373
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1379
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1385
__attribute__((nonnull, warn_unused_result))
1386
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1387
mandos_context *mc){
1389
struct timespec now;
1390
struct timespec waited_time;
1391
intmax_t block_time;
1394
if(mc->current_server == NULL){
1396
fprintf_plus(stderr, "Wait until first server is found."
1399
ret = avahi_simple_poll_iterate(s, -1);
1402
fprintf_plus(stderr, "Check current_server if we should run"
1405
/* the current time */
1406
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1408
perror_plus("clock_gettime");
1411
/* Calculating in ms how long time between now and server
1412
who we visted longest time ago. Now - last seen. */
1413
waited_time.tv_sec = (now.tv_sec
1414
- mc->current_server->last_seen.tv_sec);
1415
waited_time.tv_nsec = (now.tv_nsec
1416
- mc->current_server->last_seen.tv_nsec);
1417
/* total time is 10s/10,000ms.
1418
Converting to s from ms by dividing by 1,000,
1419
and ns to ms by dividing by 1,000,000. */
1420
block_time = ((retry_interval
1421
- ((intmax_t)waited_time.tv_sec * 1000))
1422
- ((intmax_t)waited_time.tv_nsec / 1000000));
1425
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1429
if(block_time <= 0){
1430
ret = start_mandos_communication(mc->current_server->ip,
1431
mc->current_server->port,
1432
mc->current_server->if_index,
1433
mc->current_server->af, mc);
1435
avahi_simple_poll_quit(s);
1438
ret = clock_gettime(CLOCK_MONOTONIC,
1439
&mc->current_server->last_seen);
1441
perror_plus("clock_gettime");
1444
mc->current_server = mc->current_server->next;
1445
block_time = 0; /* Call avahi to find new Mandos
1446
servers, but don't block */
1449
ret = avahi_simple_poll_iterate(s, (int)block_time);
1452
if(ret > 0 or errno != EINTR){
1453
return (ret != 1) ? ret : 0;
1459
/* Set effective uid to 0, return errno */
1460
__attribute__((warn_unused_result))
1461
error_t raise_privileges(void){
1462
error_t old_errno = errno;
1463
error_t ret_errno = 0;
1464
if(seteuid(0) == -1){
1466
perror_plus("seteuid");
1472
/* Set effective and real user ID to 0. Return errno. */
1473
__attribute__((warn_unused_result))
1474
error_t raise_privileges_permanently(void){
1475
error_t old_errno = errno;
1476
error_t ret_errno = raise_privileges();
1481
if(setuid(0) == -1){
1483
perror_plus("seteuid");
1489
/* Set effective user ID to unprivileged saved user ID */
1490
__attribute__((warn_unused_result))
1491
error_t lower_privileges(void){
1492
error_t old_errno = errno;
1493
error_t ret_errno = 0;
1494
if(seteuid(uid) == -1){
1496
perror_plus("seteuid");
1502
/* Lower privileges permanently */
1503
__attribute__((warn_unused_result))
1504
error_t lower_privileges_permanently(void){
1505
error_t old_errno = errno;
1506
error_t ret_errno = 0;
1507
if(setuid(uid) == -1){
1509
perror_plus("setuid");
1515
__attribute__((nonnull))
1516
void run_network_hooks(const char *mode, const char *interface,
1518
struct dirent **direntries;
1519
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1522
if(errno == ENOENT){
1524
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1525
" found\n", hookdir);
1528
perror_plus("scandir");
1531
struct dirent *direntry;
1533
int devnull = open("/dev/null", O_RDONLY);
1534
for(int i = 0; i < numhooks; i++){
1535
direntry = direntries[i];
1536
char *fullname = NULL;
1537
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1539
perror_plus("asprintf");
1543
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1546
pid_t hook_pid = fork();
1549
/* Raise privileges */
1550
if(raise_privileges_permanently() != 0){
1551
perror_plus("Failed to raise privileges");
1558
perror_plus("setgid");
1561
/* Reset supplementary groups */
1563
ret = setgroups(0, NULL);
1565
perror_plus("setgroups");
1568
ret = dup2(devnull, STDIN_FILENO);
1570
perror_plus("dup2(devnull, STDIN_FILENO)");
1573
ret = close(devnull);
1575
perror_plus("close");
1578
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1580
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1583
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1585
perror_plus("setenv");
1588
ret = setenv("DEVICE", interface, 1);
1590
perror_plus("setenv");
1593
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1595
perror_plus("setenv");
1598
ret = setenv("MODE", mode, 1);
1600
perror_plus("setenv");
1604
ret = asprintf(&delaystring, "%f", (double)delay);
1606
perror_plus("asprintf");
1609
ret = setenv("DELAY", delaystring, 1);
1612
perror_plus("setenv");
1616
if(connect_to != NULL){
1617
ret = setenv("CONNECT", connect_to, 1);
1619
perror_plus("setenv");
1623
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1624
perror_plus("execl");
1625
_exit(EXIT_FAILURE);
1629
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1630
perror_plus("waitpid");
1634
if(WIFEXITED(status)){
1635
if(WEXITSTATUS(status) != 0){
1636
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1637
" with status %d\n", direntry->d_name,
1638
WEXITSTATUS(status));
1642
} else if(WIFSIGNALED(status)){
1643
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1644
" signal %d\n", direntry->d_name,
1649
fprintf_plus(stderr, "Warning: network hook \"%s\""
1650
" crashed\n", direntry->d_name);
1657
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1665
__attribute__((nonnull, warn_unused_result))
1666
error_t bring_up_interface(const char *const interface,
1668
error_t old_errno = errno;
1670
struct ifreq network;
1671
unsigned int if_index = if_nametoindex(interface);
1673
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1683
if(not interface_is_up(interface)){
1684
error_t ret_errno = 0, ioctl_errno = 0;
1685
if(not get_flags(interface, &network)){
1687
fprintf_plus(stderr, "Failed to get flags for interface "
1688
"\"%s\"\n", interface);
1692
network.ifr_flags |= IFF_UP; /* set flag */
1694
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1697
perror_plus("socket");
1703
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1705
perror_plus("close");
1712
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1716
/* Raise privileges */
1717
ret_errno = raise_privileges();
1719
perror_plus("Failed to raise privileges");
1724
bool restore_loglevel = false;
1726
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1727
messages about the network interface to mess up the prompt */
1728
ret_linux = klogctl(8, NULL, 5);
1729
if(ret_linux == -1){
1730
perror_plus("klogctl");
1732
restore_loglevel = true;
1735
#endif /* __linux__ */
1736
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1737
ioctl_errno = errno;
1739
if(restore_loglevel){
1740
ret_linux = klogctl(7, NULL, 0);
1741
if(ret_linux == -1){
1742
perror_plus("klogctl");
1745
#endif /* __linux__ */
1747
/* If raise_privileges() succeeded above */
1749
/* Lower privileges */
1750
ret_errno = lower_privileges();
1753
perror_plus("Failed to lower privileges");
1757
/* Close the socket */
1758
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1760
perror_plus("close");
1763
if(ret_setflags == -1){
1764
errno = ioctl_errno;
1765
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1770
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1774
/* Sleep checking until interface is running.
1775
Check every 0.25s, up to total time of delay */
1776
for(int i=0; i < delay * 4; i++){
1777
if(interface_is_running(interface)){
1780
struct timespec sleeptime = { .tv_nsec = 250000000 };
1781
ret = nanosleep(&sleeptime, NULL);
1782
if(ret == -1 and errno != EINTR){
1783
perror_plus("nanosleep");
1791
__attribute__((nonnull, warn_unused_result))
1792
error_t take_down_interface(const char *const interface){
1793
error_t old_errno = errno;
1794
struct ifreq network;
1795
unsigned int if_index = if_nametoindex(interface);
1797
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1801
if(interface_is_up(interface)){
1802
error_t ret_errno = 0, ioctl_errno = 0;
1803
if(not get_flags(interface, &network) and debug){
1805
fprintf_plus(stderr, "Failed to get flags for interface "
1806
"\"%s\"\n", interface);
1810
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1812
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1815
perror_plus("socket");
1821
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1825
/* Raise privileges */
1826
ret_errno = raise_privileges();
1828
perror_plus("Failed to raise privileges");
1831
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1832
ioctl_errno = errno;
1834
/* If raise_privileges() succeeded above */
1836
/* Lower privileges */
1837
ret_errno = lower_privileges();
1840
perror_plus("Failed to lower privileges");
1844
/* Close the socket */
1845
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1847
perror_plus("close");
1850
if(ret_setflags == -1){
1851
errno = ioctl_errno;
1852
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1857
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
700
/* Combines file name and path and returns the malloced new
701
string. some sane checks could/should be added */
702
static const char *combinepath(const char *first, const char *second){
703
size_t f_len = strlen(first);
704
size_t s_len = strlen(second);
705
char *tmp = malloc(f_len + s_len + 2);
710
memcpy(tmp, first, f_len); /* Spurious warning */
714
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
716
tmp[f_len + 1 + s_len] = '\0';
1865
721
int main(int argc, char *argv[]){
1866
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1867
.priority = "SECURE256:!CTYPE-X.509:"
1868
"+CTYPE-OPENPGP", .current_server = NULL,
1869
.interfaces = NULL, .interfaces_size = 0 };
1870
AvahiSServiceBrowser *sb = NULL;
1875
int exitcode = EXIT_SUCCESS;
1876
char *interfaces_to_take_down = NULL;
1877
size_t interfaces_to_take_down_size = 0;
1878
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1879
char old_tempdir[] = "/tmp/mandosXXXXXX";
1880
char *tempdir = NULL;
1881
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1882
const char *seckey = PATHDIR "/" SECKEY;
1883
const char *pubkey = PATHDIR "/" PUBKEY;
1884
char *interfaces_hooks = NULL;
1886
bool gnutls_initialized = false;
1887
bool gpgme_initialized = false;
1889
double retry_interval = 10; /* 10s between trying a server and
1890
retrying the same server again */
1892
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1893
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1898
/* Lower any group privileges we might have, just to be safe */
1902
perror_plus("setgid");
1905
/* Lower user privileges (temporarily) */
1909
perror_plus("seteuid");
1917
struct argp_option options[] = {
1918
{ .name = "debug", .key = 128,
1919
.doc = "Debug mode", .group = 3 },
1920
{ .name = "connect", .key = 'c',
1921
.arg = "ADDRESS:PORT",
1922
.doc = "Connect directly to a specific Mandos server",
1924
{ .name = "interface", .key = 'i',
1926
.doc = "Network interface that will be used to search for"
1929
{ .name = "seckey", .key = 's',
1931
.doc = "OpenPGP secret key file base name",
1933
{ .name = "pubkey", .key = 'p',
1935
.doc = "OpenPGP public key file base name",
1937
{ .name = "dh-bits", .key = 129,
1939
.doc = "Bit length of the prime number used in the"
1940
" Diffie-Hellman key exchange",
1942
{ .name = "priority", .key = 130,
1944
.doc = "GnuTLS priority string for the TLS handshake",
1946
{ .name = "delay", .key = 131,
1948
.doc = "Maximum delay to wait for interface startup",
1950
{ .name = "retry", .key = 132,
1952
.doc = "Retry interval used when denied by the Mandos server",
1954
{ .name = "network-hook-dir", .key = 133,
1956
.doc = "Directory where network hooks are located",
1959
* These reproduce what we would get without ARGP_NO_HELP
1961
{ .name = "help", .key = '?',
1962
.doc = "Give this help list", .group = -1 },
1963
{ .name = "usage", .key = -3,
1964
.doc = "Give a short usage message", .group = -1 },
1965
{ .name = "version", .key = 'V',
1966
.doc = "Print program version", .group = -1 },
1970
error_t parse_opt(int key, char *arg,
1971
struct argp_state *state){
722
AvahiSServiceBrowser *sb = NULL;
725
int exitcode = EXIT_SUCCESS;
726
const char *interface = "eth0";
727
struct ifreq network;
731
char *connect_to = NULL;
732
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
733
const char *pubkeyfile = "pubkey.txt";
734
const char *seckeyfile = "seckey.txt";
735
mandos_context mc = { .simple_poll = NULL, .server = NULL,
736
.dh_bits = 1024, .priority = "SECURE256"};
739
struct argp_option options[] = {
740
{ .name = "debug", .key = 128,
741
.doc = "Debug mode", .group = 3 },
742
{ .name = "connect", .key = 'c',
744
.doc = "Connect directly to a sepcified mandos server", .group = 1 },
745
{ .name = "interface", .key = 'i',
747
.doc = "Interface that Avahi will conntect through", .group = 1 },
748
{ .name = "keydir", .key = 'd',
750
.doc = "Directory where the openpgp keyring is", .group = 1 },
751
{ .name = "seckey", .key = 's',
753
.doc = "Secret openpgp key for gnutls authentication", .group = 1 },
754
{ .name = "pubkey", .key = 'p',
756
.doc = "Public openpgp key for gnutls authentication", .group = 2 },
757
{ .name = "dh-bits", .key = 129,
759
.doc = "dh-bits to use in gnutls communication", .group = 2 },
760
{ .name = "priority", .key = 130,
762
.doc = "GNUTLS priority", .group = 1 },
767
error_t parse_opt (int key, char *arg, struct argp_state *state) {
768
/* Get the INPUT argument from `argp_parse', which we know is a
769
pointer to our plugin list pointer. */
791
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
806
return ARGP_ERR_UNKNOWN;
811
struct argp argp = { .options = options, .parser = parse_opt,
813
.doc = "Mandos client -- Get and decrypt passwords from mandos server" };
814
argp_parse (&argp, argc, argv, 0, 0, NULL);
817
pubkeyfile = combinepath(keydir, pubkeyfile);
818
if (pubkeyfile == NULL){
819
perror("combinepath");
820
exitcode = EXIT_FAILURE;
824
seckeyfile = combinepath(keydir, seckeyfile);
825
if (seckeyfile == NULL){
826
perror("combinepath");
830
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
832
fprintf(stderr, "init_gnutls_global\n");
849
if_index = (AvahiIfIndex) if_nametoindex(interface);
851
fprintf(stderr, "No such interface: \"%s\"\n", interface);
855
if(connect_to != NULL){
856
/* Connect directly, do not use Zeroconf */
857
/* (Mainly meant for debugging) */
858
char *address = strrchr(connect_to, ':');
860
fprintf(stderr, "No colon in address\n");
861
exitcode = EXIT_FAILURE;
1974
case 128: /* --debug */
1977
case 'c': /* --connect */
1980
case 'i': /* --interface */
1981
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1984
argp_error(state, "%s", strerror(ret_errno));
1987
case 's': /* --seckey */
1990
case 'p': /* --pubkey */
1993
case 129: /* --dh-bits */
1995
tmpmax = strtoimax(arg, &tmp, 10);
1996
if(errno != 0 or tmp == arg or *tmp != '\0'
1997
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1998
argp_error(state, "Bad number of DH bits");
2000
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2002
case 130: /* --priority */
2005
case 131: /* --delay */
2007
delay = strtof(arg, &tmp);
2008
if(errno != 0 or tmp == arg or *tmp != '\0'){
2009
argp_error(state, "Bad delay");
2011
case 132: /* --retry */
2013
retry_interval = strtod(arg, &tmp);
2014
if(errno != 0 or tmp == arg or *tmp != '\0'
2015
or (retry_interval * 1000) > INT_MAX
2016
or retry_interval < 0){
2017
argp_error(state, "Bad retry interval");
2020
case 133: /* --network-hook-dir */
2024
* These reproduce what we would get without ARGP_NO_HELP
2026
case '?': /* --help */
2027
argp_state_help(state, state->out_stream,
2028
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2029
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2030
case -3: /* --usage */
2031
argp_state_help(state, state->out_stream,
2032
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2033
case 'V': /* --version */
2034
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2035
exit(argp_err_exit_status);
2038
return ARGP_ERR_UNKNOWN;
2043
struct argp argp = { .options = options, .parser = parse_opt,
2045
.doc = "Mandos client -- Get and decrypt"
2046
" passwords from a Mandos server" };
2047
ret = argp_parse(&argp, argc, argv,
2048
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2055
perror_plus("argp_parse");
2056
exitcode = EX_OSERR;
2059
exitcode = EX_USAGE;
2065
/* Work around Debian bug #633582:
2066
<http://bugs.debian.org/633582> */
2068
/* Re-raise privileges */
2069
ret_errno = raise_privileges();
2072
perror_plus("Failed to raise privileges");
2076
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2077
int seckey_fd = open(seckey, O_RDONLY);
2078
if(seckey_fd == -1){
2079
perror_plus("open");
2081
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2083
perror_plus("fstat");
2085
if(S_ISREG(st.st_mode)
2086
and st.st_uid == 0 and st.st_gid == 0){
2087
ret = fchown(seckey_fd, uid, gid);
2089
perror_plus("fchown");
2093
TEMP_FAILURE_RETRY(close(seckey_fd));
2097
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2098
int pubkey_fd = open(pubkey, O_RDONLY);
2099
if(pubkey_fd == -1){
2100
perror_plus("open");
2102
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2104
perror_plus("fstat");
2106
if(S_ISREG(st.st_mode)
2107
and st.st_uid == 0 and st.st_gid == 0){
2108
ret = fchown(pubkey_fd, uid, gid);
2110
perror_plus("fchown");
2114
TEMP_FAILURE_RETRY(close(pubkey_fd));
2118
/* Lower privileges */
2119
ret_errno = lower_privileges();
2122
perror_plus("Failed to lower privileges");
2127
/* Remove invalid interface names (except "none") */
2129
char *interface = NULL;
2130
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2132
if(strcmp(interface, "none") != 0
2133
and if_nametoindex(interface) == 0){
2134
if(interface[0] != '\0'){
2135
fprintf_plus(stderr, "Not using nonexisting interface"
2136
" \"%s\"\n", interface);
2138
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2144
/* Run network hooks */
2146
if(mc.interfaces != NULL){
2147
interfaces_hooks = malloc(mc.interfaces_size);
2148
if(interfaces_hooks == NULL){
2149
perror_plus("malloc");
2152
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2153
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2155
run_network_hooks("start", interfaces_hooks != NULL ?
2156
interfaces_hooks : "", delay);
2160
avahi_set_log_function(empty_log);
2163
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2164
from the signal handler */
2165
/* Initialize the pseudo-RNG for Avahi */
2166
srand((unsigned int) time(NULL));
2167
simple_poll = avahi_simple_poll_new();
2168
if(simple_poll == NULL){
2169
fprintf_plus(stderr,
2170
"Avahi: Failed to create simple poll object.\n");
2171
exitcode = EX_UNAVAILABLE;
2175
sigemptyset(&sigterm_action.sa_mask);
2176
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2178
perror_plus("sigaddset");
2179
exitcode = EX_OSERR;
2182
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2184
perror_plus("sigaddset");
2185
exitcode = EX_OSERR;
2188
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2190
perror_plus("sigaddset");
2191
exitcode = EX_OSERR;
2194
/* Need to check if the handler is SIG_IGN before handling:
2195
| [[info:libc:Initial Signal Actions]] |
2196
| [[info:libc:Basic Signal Handling]] |
2198
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2200
perror_plus("sigaction");
2203
if(old_sigterm_action.sa_handler != SIG_IGN){
2204
ret = sigaction(SIGINT, &sigterm_action, NULL);
2206
perror_plus("sigaction");
2207
exitcode = EX_OSERR;
2211
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2213
perror_plus("sigaction");
2216
if(old_sigterm_action.sa_handler != SIG_IGN){
2217
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2219
perror_plus("sigaction");
2220
exitcode = EX_OSERR;
2224
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2226
perror_plus("sigaction");
2229
if(old_sigterm_action.sa_handler != SIG_IGN){
2230
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2232
perror_plus("sigaction");
2233
exitcode = EX_OSERR;
2238
/* If no interfaces were specified, make a list */
2239
if(mc.interfaces == NULL){
2240
struct dirent **direntries;
2241
/* Look for any good interfaces */
2242
ret = scandir(sys_class_net, &direntries, good_interface,
2245
/* Add all found interfaces to interfaces list */
2246
for(int i = 0; i < ret; ++i){
2247
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2248
direntries[i]->d_name);
2251
perror_plus("argz_add");
2255
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2256
direntries[i]->d_name);
2262
fprintf_plus(stderr, "Could not find a network interface\n");
2263
exitcode = EXIT_FAILURE;
2268
/* Bring up interfaces which are down, and remove any "none"s */
2270
char *interface = NULL;
2271
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2273
/* If interface name is "none", stop bringing up interfaces.
2274
Also remove all instances of "none" from the list */
2275
if(strcmp(interface, "none") == 0){
2276
argz_delete(&mc.interfaces, &mc.interfaces_size,
2279
while((interface = argz_next(mc.interfaces,
2280
mc.interfaces_size, interface))){
2281
if(strcmp(interface, "none") == 0){
2282
argz_delete(&mc.interfaces, &mc.interfaces_size,
2289
bool interface_was_up = interface_is_up(interface);
2290
errno = bring_up_interface(interface, delay);
2291
if(not interface_was_up){
2293
perror_plus("Failed to bring up interface");
2295
errno = argz_add(&interfaces_to_take_down,
2296
&interfaces_to_take_down_size,
2299
perror_plus("argz_add");
2304
if(debug and (interfaces_to_take_down == NULL)){
2305
fprintf_plus(stderr, "No interfaces were brought up\n");
2309
/* If we only got one interface, explicitly use only that one */
2310
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2312
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2315
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2322
ret = init_gnutls_global(pubkey, seckey, &mc);
2324
fprintf_plus(stderr, "init_gnutls_global failed\n");
2325
exitcode = EX_UNAVAILABLE;
2328
gnutls_initialized = true;
2335
/* Try /run/tmp before /tmp */
2336
tempdir = mkdtemp(run_tempdir);
2337
if(tempdir == NULL and errno == ENOENT){
2339
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2340
run_tempdir, old_tempdir);
2342
tempdir = mkdtemp(old_tempdir);
2344
if(tempdir == NULL){
2345
perror_plus("mkdtemp");
2353
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2354
fprintf_plus(stderr, "init_gpgme failed\n");
2355
exitcode = EX_UNAVAILABLE;
2358
gpgme_initialized = true;
2365
if(connect_to != NULL){
2366
/* Connect directly, do not use Zeroconf */
2367
/* (Mainly meant for debugging) */
2368
char *address = strrchr(connect_to, ':');
2370
if(address == NULL){
2371
fprintf_plus(stderr, "No colon in address\n");
2372
exitcode = EX_USAGE;
2382
tmpmax = strtoimax(address+1, &tmp, 10);
2383
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2384
or tmpmax != (in_port_t)tmpmax){
2385
fprintf_plus(stderr, "Bad port number\n");
2386
exitcode = EX_USAGE;
2394
port = (in_port_t)tmpmax;
2396
/* Colon in address indicates IPv6 */
2398
if(strchr(connect_to, ':') != NULL){
2400
/* Accept [] around IPv6 address - see RFC 5952 */
2401
if(connect_to[0] == '[' and address[-1] == ']')
2409
address = connect_to;
2415
while(not quit_now){
2416
ret = start_mandos_communication(address, port, if_index, af,
2418
if(quit_now or ret == 0){
2422
fprintf_plus(stderr, "Retrying in %d seconds\n",
2423
(int)retry_interval);
2425
sleep((unsigned int)retry_interval);
2429
exitcode = EXIT_SUCCESS;
2440
AvahiServerConfig config;
2441
/* Do not publish any local Zeroconf records */
2442
avahi_server_config_init(&config);
2443
config.publish_hinfo = 0;
2444
config.publish_addresses = 0;
2445
config.publish_workstation = 0;
2446
config.publish_domain = 0;
2448
/* Allocate a new server */
2449
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2450
&config, NULL, NULL, &ret_errno);
2452
/* Free the Avahi configuration data */
2453
avahi_server_config_free(&config);
2456
/* Check if creating the Avahi server object succeeded */
2457
if(mc.server == NULL){
2458
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2459
avahi_strerror(ret_errno));
2460
exitcode = EX_UNAVAILABLE;
2468
/* Create the Avahi service browser */
2469
sb = avahi_s_service_browser_new(mc.server, if_index,
2470
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2471
NULL, 0, browse_callback,
2474
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2475
avahi_strerror(avahi_server_errno(mc.server)));
2476
exitcode = EX_UNAVAILABLE;
2484
/* Run the main loop */
2487
fprintf_plus(stderr, "Starting Avahi loop search\n");
2490
ret = avahi_loop_with_timeout(simple_poll,
2491
(int)(retry_interval * 1000), &mc);
2493
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2494
(ret == 0) ? "successfully" : "with error");
865
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
867
perror("Bad port number");
868
exitcode = EXIT_FAILURE;
872
address = connect_to;
873
ret = start_mandos_communication(address, port, if_index, &mc);
875
exitcode = EXIT_FAILURE;
877
exitcode = EXIT_SUCCESS;
882
/* If the interface is down, bring it up */
884
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
887
exitcode = EXIT_FAILURE;
890
strcpy(network.ifr_name, interface); /* Spurious warning */
891
ret = ioctl(sd, SIOCGIFFLAGS, &network);
893
perror("ioctl SIOCGIFFLAGS");
894
exitcode = EXIT_FAILURE;
897
if((network.ifr_flags & IFF_UP) == 0){
898
network.ifr_flags |= IFF_UP;
899
ret = ioctl(sd, SIOCSIFFLAGS, &network);
901
perror("ioctl SIOCSIFFLAGS");
902
exitcode = EXIT_FAILURE;
910
avahi_set_log_function(empty_log);
913
/* Initialize the pseudo-RNG for Avahi */
914
srand((unsigned int) time(NULL));
916
/* Allocate main Avahi loop object */
917
mc.simple_poll = avahi_simple_poll_new();
918
if (mc.simple_poll == NULL) {
919
fprintf(stderr, "Avahi: Failed to create simple poll"
921
exitcode = EXIT_FAILURE;
926
AvahiServerConfig config;
927
/* Do not publish any local Zeroconf records */
928
avahi_server_config_init(&config);
929
config.publish_hinfo = 0;
930
config.publish_addresses = 0;
931
config.publish_workstation = 0;
932
config.publish_domain = 0;
934
/* Allocate a new server */
935
mc.server = avahi_server_new(avahi_simple_poll_get
936
(mc.simple_poll), &config, NULL,
939
/* Free the Avahi configuration data */
940
avahi_server_config_free(&config);
943
/* Check if creating the Avahi server object succeeded */
944
if (mc.server == NULL) {
945
fprintf(stderr, "Failed to create Avahi server: %s\n",
946
avahi_strerror(error));
947
exitcode = EXIT_FAILURE;
951
/* Create the Avahi service browser */
952
sb = avahi_s_service_browser_new(mc.server, if_index,
954
"_mandos._tcp", NULL, 0,
955
browse_callback, &mc);
957
fprintf(stderr, "Failed to create service browser: %s\n",
958
avahi_strerror(avahi_server_errno(mc.server)));
959
exitcode = EXIT_FAILURE;
963
/* Run the main loop */
966
fprintf(stderr, "Starting Avahi loop search\n");
969
avahi_simple_poll_loop(mc.simple_poll);
2500
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2503
/* Cleanup things */
2504
free(mc.interfaces);
2507
avahi_s_service_browser_free(sb);
2509
if(mc.server != NULL)
2510
avahi_server_free(mc.server);
2512
if(simple_poll != NULL)
2513
avahi_simple_poll_free(simple_poll);
2515
if(gnutls_initialized){
2516
gnutls_certificate_free_credentials(mc.cred);
2517
gnutls_global_deinit();
2518
gnutls_dh_params_deinit(mc.dh_params);
2521
if(gpgme_initialized){
2522
gpgme_release(mc.ctx);
2525
/* Cleans up the circular linked list of Mandos servers the client
2527
if(mc.current_server != NULL){
2528
mc.current_server->prev->next = NULL;
2529
while(mc.current_server != NULL){
2530
server *next = mc.current_server->next;
2531
free(mc.current_server);
2532
mc.current_server = next;
2536
/* Re-raise privileges */
2538
ret_errno = raise_privileges();
2540
perror_plus("Failed to raise privileges");
2543
/* Run network hooks */
2544
run_network_hooks("stop", interfaces_hooks != NULL ?
2545
interfaces_hooks : "", delay);
2547
/* Take down the network interfaces which were brought up */
2549
char *interface = NULL;
2550
while((interface=argz_next(interfaces_to_take_down,
2551
interfaces_to_take_down_size,
2553
ret_errno = take_down_interface(interface);
2556
perror_plus("Failed to take down interface");
2559
if(debug and (interfaces_to_take_down == NULL)){
2560
fprintf_plus(stderr, "No interfaces needed to be taken"
2566
ret_errno = lower_privileges_permanently();
2568
perror_plus("Failed to lower privileges permanently");
2572
free(interfaces_to_take_down);
2573
free(interfaces_hooks);
2575
/* Removes the GPGME temp directory and all files inside */
2576
if(tempdir != NULL){
2577
struct dirent **direntries = NULL;
2578
struct dirent *direntry = NULL;
2579
int numentries = scandir(tempdir, &direntries, notdotentries,
2582
for(int i = 0; i < numentries; i++){
2583
direntry = direntries[i];
2584
char *fullname = NULL;
2585
ret = asprintf(&fullname, "%s/%s", tempdir,
2588
perror_plus("asprintf");
2591
ret = remove(fullname);
2593
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2600
/* need to clean even if 0 because man page doesn't specify */
2602
if(numentries == -1){
2603
perror_plus("scandir");
2605
ret = rmdir(tempdir);
2606
if(ret == -1 and errno != ENOENT){
2607
perror_plus("rmdir");
2612
sigemptyset(&old_sigterm_action.sa_mask);
2613
old_sigterm_action.sa_handler = SIG_DFL;
2614
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2615
&old_sigterm_action,
2618
perror_plus("sigaction");
2621
ret = raise(signal_received);
2622
} while(ret != 0 and errno == EINTR);
2624
perror_plus("raise");
2627
TEMP_FAILURE_RETRY(pause());
974
fprintf(stderr, "%s exiting\n", argv[0]);
979
avahi_s_service_browser_free(sb);
981
if (mc.server != NULL)
982
avahi_server_free(mc.server);
984
if (mc.simple_poll != NULL)
985
avahi_simple_poll_free(mc.simple_poll);