32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
33
34
#define _LARGEFILE_SOURCE
36
#ifndef _FILE_OFFSET_BITS
34
37
#define _FILE_OFFSET_BITS 64
36
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
38
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
stdout, ferror(), sscanf(),
43
stdout, ferror(), remove() */
41
44
#include <stdint.h> /* uint16_t, uint32_t */
42
45
#include <stddef.h> /* NULL, size_t, ssize_t */
43
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
45
#include <stdbool.h> /* bool, true */
48
#include <stdbool.h> /* bool, false, true */
46
49
#include <string.h> /* memset(), strcmp(), strlen(),
47
50
strerror(), asprintf(), strcpy() */
48
#include <sys/ioctl.h> /* ioctl */
51
#include <sys/ioctl.h> /* ioctl */
49
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
50
53
sockaddr_in6, PF_INET6,
51
SOCK_STREAM, INET6_ADDRSTRLEN,
52
uid_t, gid_t, open(), opendir(),
54
SOCK_STREAM, uid_t, gid_t, open(),
54
56
#include <sys/stat.h> /* open() */
55
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
56
struct in6_addr, inet_pton(),
58
inet_pton(), connect() */
58
59
#include <fcntl.h> /* open() */
59
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
62
64
#include <assert.h> /* assert() */
63
65
#include <errno.h> /* perror(), errno */
64
66
#include <time.h> /* nanosleep(), time() */
65
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
66
68
SIOCSIFFLAGS, if_indextoname(),
67
69
if_nametoindex(), IF_NAMESIZE */
68
#include <netinet/in.h>
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
69
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
70
74
getuid(), getgid(), setuid(),
72
76
#include <arpa/inet.h> /* inet_pton(), htons */
73
#include <iso646.h> /* not, and, or */
77
#include <iso646.h> /* not, or, and */
74
78
#include <argp.h> /* struct argp_option, error_t, struct
75
79
argp_state, struct argp,
76
80
argp_parse(), ARGP_KEY_ARG,
77
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sigaction,
79
87
#include <sys/klog.h> /* klogctl() */
88
#endif /* __linux__ */
83
91
/* All Avahi types, constants and functions
130
138
} mandos_context;
140
/* global context so signal handler can reach it*/
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
142
.dh_bits = 1024, .priority = "SECURE256"
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
133
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
134
* "buffer_capacity" is how much is currently allocated,
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
147
* bytes. "buffer_capacity" is how much is currently allocated,
135
148
* "buffer_length" is how much is already used.
137
size_t adjustbuffer(char **buffer, size_t buffer_length,
150
size_t incbuffer(char **buffer, size_t buffer_length,
138
151
size_t buffer_capacity){
139
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
140
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
439
450
/* GnuTLS server initialization */
440
ret = gnutls_dh_params_init(&mc->dh_params);
451
ret = gnutls_dh_params_init(&mc.dh_params);
441
452
if(ret != GNUTLS_E_SUCCESS){
442
453
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
443
454
" %s\n", safer_gnutls_strerror(ret));
446
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
457
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
447
458
if(ret != GNUTLS_E_SUCCESS){
448
459
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
449
460
safer_gnutls_strerror(ret));
453
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
464
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
459
gnutls_certificate_free_credentials(mc->cred);
470
gnutls_certificate_free_credentials(mc.cred);
460
471
gnutls_global_deinit();
461
gnutls_dh_params_deinit(mc->dh_params);
472
gnutls_dh_params_deinit(mc.dh_params);
465
static int init_gnutls_session(mandos_context *mc,
466
gnutls_session_t *session){
476
static int init_gnutls_session(gnutls_session_t *session){
468
478
/* GnuTLS session creation */
469
479
ret = gnutls_init(session, GNUTLS_SERVER);
520
533
ssize_t decrypted_buffer_size;
523
char interface[IF_NAMESIZE];
524
536
gnutls_session_t session;
526
ret = init_gnutls_session(mc, &session);
537
int pf; /* Protocol family */
547
fprintf(stderr, "Bad address family: %d\n", af);
551
ret = init_gnutls_session(&session);
532
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
557
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
536
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
561
tcp_sd = socket(pf, SOCK_STREAM, 0);
538
563
perror("socket");
543
if(if_indextoname((unsigned int)if_index, interface) == NULL){
544
perror("if_indextoname");
547
fprintf(stderr, "Binding to interface %s\n", interface);
550
567
memset(&to, 0, sizeof(to));
551
to.in6.sin6_family = AF_INET6;
552
/* It would be nice to have a way to detect if we were passed an
553
IPv4 address here. Now we assume an IPv6 address. */
554
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
569
to.in6.sin6_family = (uint16_t)af;
570
ret = inet_pton(af, ip, &to.in6.sin6_addr);
572
to.in.sin_family = (sa_family_t)af;
573
ret = inet_pton(af, ip, &to.in.sin_addr);
556
576
perror("inet_pton");
560
580
fprintf(stderr, "Bad address: %s\n", ip);
563
to.in6.sin6_port = htons(port); /* Spurious warnings from
584
to.in6.sin6_port = htons(port); /* Spurious warnings from
586
-Wunreachable-code */
588
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
589
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
591
if(if_index == AVAHI_IF_UNSPEC){
592
fprintf(stderr, "An IPv6 link-local address is incomplete"
593
" without a network interface\n");
596
/* Set the network interface number as scope */
597
to.in6.sin6_scope_id = (uint32_t)if_index;
600
to.in.sin_port = htons(port); /* Spurious warnings from
565
602
-Wunreachable-code */
567
to.in6.sin6_scope_id = (uint32_t)if_index;
570
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
572
char addrstr[INET6_ADDRSTRLEN] = "";
573
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
574
sizeof(addrstr)) == NULL){
606
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
607
char interface[IF_NAMESIZE];
608
if(if_indextoname((unsigned int)if_index, interface) == NULL){
609
perror("if_indextoname");
611
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
612
ip, interface, port);
615
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
618
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
619
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
622
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
625
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
575
629
perror("inet_ntop");
577
631
if(strcmp(addrstr, ip) != 0){
801
858
the callback function is called the Avahi server will free the
802
859
resolver for us. */
804
if(!(avahi_s_service_resolver_new(mc->server, interface,
805
protocol, name, type, domain,
806
AVAHI_PROTO_INET6, 0,
807
resolve_callback, mc)))
861
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
862
name, type, domain, protocol, 0,
863
resolve_callback, NULL) == NULL)
808
864
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
809
name, avahi_strerror(avahi_server_errno(mc->server)));
865
name, avahi_strerror(avahi_server_errno(mc.server)));
812
868
case AVAHI_BROWSER_REMOVE:
1020
avahi_set_log_function(empty_log);
1023
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1024
from the signal handler */
1025
/* Initialize the pseudo-RNG for Avahi */
1026
srand((unsigned int) time(NULL));
1027
mc.simple_poll = avahi_simple_poll_new();
1028
if(mc.simple_poll == NULL){
1029
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1030
exitcode = EXIT_FAILURE;
1034
sigemptyset(&sigterm_action.sa_mask);
1035
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1037
perror("sigaddset");
1038
exitcode = EXIT_FAILURE;
1041
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1043
perror("sigaddset");
1044
exitcode = EXIT_FAILURE;
1047
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1049
perror("sigaddset");
1050
exitcode = EXIT_FAILURE;
1053
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1055
perror("sigaction");
1056
exitcode = EXIT_FAILURE;
946
1060
/* If the interface is down, bring it up */
1061
if(interface[0] != '\0'){
948
1062
#ifdef __linux__
949
1063
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
950
1064
messages to mess up the prompt */
951
1065
ret = klogctl(8, NULL, 5);
1066
bool restore_loglevel = true;
1068
restore_loglevel = false;
953
1069
perror("klogctl");
1071
#endif /* __linux__ */
957
1073
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
959
1075
perror("socket");
960
1076
exitcode = EXIT_FAILURE;
961
1077
#ifdef __linux__
962
ret = klogctl(7, NULL, 0);
1078
if(restore_loglevel){
1079
ret = klogctl(7, NULL, 0);
1084
#endif /* __linux__ */
969
1087
strcpy(network.ifr_name, interface);
1137
1257
/* Create the Avahi service browser */
1138
1258
sb = avahi_s_service_browser_new(mc.server, if_index,
1139
AVAHI_PROTO_INET6, "_mandos._tcp",
1140
NULL, 0, browse_callback, &mc);
1259
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1260
NULL, 0, browse_callback, NULL);
1141
1261
if(sb == NULL){
1142
1262
fprintf(stderr, "Failed to create service browser: %s\n",
1143
1263
avahi_strerror(avahi_server_errno(mc.server)));