46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strncpy(), strsignal()
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
52
51
#include <sys/ioctl.h> /* ioctl */
53
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
54
53
sockaddr_in6, PF_INET6,
58
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
59
58
inet_pton(), connect(),
61
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
#include <fcntl.h> /* open(), unlinkat() */
62
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
64
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
66
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
67
EAI_SYSTEM, ENETUNREACH,
68
EHOSTUNREACH, ECONNREFUSED, EPROTO,
69
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
65
#include <errno.h> /* perror(), errno,
71
66
program_invocation_short_name */
72
67
#include <time.h> /* nanosleep(), time(), sleep() */
73
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
518
508
fprintf_plus(stderr, "GnuTLS: %s", string);
521
__attribute__((nonnull(1, 2, 4), warn_unused_result))
511
__attribute__((nonnull, warn_unused_result))
522
512
static int init_gnutls_global(const char *pubkeyfilename,
523
513
const char *seckeyfilename,
524
const char *dhparamsfilename,
525
514
mandos_context *mc){
530
518
fprintf_plus(stderr, "Initializing GnuTLS\n");
521
ret = gnutls_global_init();
522
if(ret != GNUTLS_E_SUCCESS){
523
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
524
safer_gnutls_strerror(ret));
534
529
/* "Use a log level over 10 to enable all debugging options."
535
530
* - GnuTLS manual
573
569
safer_gnutls_strerror(ret));
576
/* If a Diffie-Hellman parameters file was given, try to use it */
577
if(dhparamsfilename != NULL){
578
gnutls_datum_t params = { .data = NULL, .size = 0 };
580
int dhpfile = open(dhparamsfilename, O_RDONLY);
583
dhparamsfilename = NULL;
586
size_t params_capacity = 0;
588
params_capacity = incbuffer((char **)¶ms.data,
590
(size_t)params_capacity);
591
if(params_capacity == 0){
592
perror_plus("incbuffer");
595
dhparamsfilename = NULL;
598
ssize_t bytes_read = read(dhpfile,
599
params.data + params.size,
605
/* check bytes_read for failure */
610
dhparamsfilename = NULL;
613
params.size += (unsigned int)bytes_read;
615
if(params.data == NULL){
616
dhparamsfilename = NULL;
618
if(dhparamsfilename == NULL){
621
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
622
GNUTLS_X509_FMT_PEM);
623
if(ret != GNUTLS_E_SUCCESS){
624
fprintf_plus(stderr, "Failed to parse DH parameters in file"
625
" \"%s\": %s\n", dhparamsfilename,
626
safer_gnutls_strerror(ret));
627
dhparamsfilename = NULL;
632
if(dhparamsfilename == NULL){
633
if(mc->dh_bits == 0){
634
/* Find out the optimal number of DH bits */
635
/* Try to read the private key file */
636
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
638
int secfile = open(seckeyfilename, O_RDONLY);
643
size_t buffer_capacity = 0;
645
buffer_capacity = incbuffer((char **)&buffer.data,
647
(size_t)buffer_capacity);
648
if(buffer_capacity == 0){
649
perror_plus("incbuffer");
654
ssize_t bytes_read = read(secfile,
655
buffer.data + buffer.size,
661
/* check bytes_read for failure */
668
buffer.size += (unsigned int)bytes_read;
672
/* If successful, use buffer to parse private key */
673
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
674
if(buffer.data != NULL){
676
gnutls_openpgp_privkey_t privkey = NULL;
677
ret = gnutls_openpgp_privkey_init(&privkey);
678
if(ret != GNUTLS_E_SUCCESS){
679
fprintf_plus(stderr, "Error initializing OpenPGP key"
681
safer_gnutls_strerror(ret));
685
ret = gnutls_openpgp_privkey_import
686
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
687
if(ret != GNUTLS_E_SUCCESS){
688
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
689
safer_gnutls_strerror(ret));
695
/* Use private key to suggest an appropriate
697
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
698
gnutls_openpgp_privkey_deinit(privkey);
700
fprintf_plus(stderr, "This OpenPGP key implies using"
701
" a GnuTLS security parameter \"%s\".\n",
702
safe_string(gnutls_sec_param_get_name
708
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
709
/* Err on the side of caution */
710
sec_param = GNUTLS_SEC_PARAM_ULTRA;
712
fprintf_plus(stderr, "Falling back to security parameter"
714
safe_string(gnutls_sec_param_get_name
719
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
723
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
724
" implies %u DH bits; using that.\n",
725
safe_string(gnutls_sec_param_get_name
730
fprintf_plus(stderr, "Failed to get implied number of DH"
731
" bits for security parameter \"%s\"): %s\n",
732
safe_string(gnutls_sec_param_get_name
734
safer_gnutls_strerror(ret));
738
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
741
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
742
if(ret != GNUTLS_E_SUCCESS){
743
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
744
" bits): %s\n", mc->dh_bits,
745
safer_gnutls_strerror(ret));
572
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
573
if(ret != GNUTLS_E_SUCCESS){
574
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
575
safer_gnutls_strerror(ret));
749
579
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
820
653
/* Set effective uid to 0, return errno */
821
654
__attribute__((warn_unused_result))
822
int raise_privileges(void){
823
int old_errno = errno;
655
error_t raise_privileges(void){
656
error_t old_errno = errno;
657
error_t ret_errno = 0;
825
658
if(seteuid(0) == -1){
828
661
errno = old_errno;
832
665
/* Set effective and real user ID to 0. Return errno. */
833
666
__attribute__((warn_unused_result))
834
int raise_privileges_permanently(void){
835
int old_errno = errno;
836
int ret = raise_privileges();
667
error_t raise_privileges_permanently(void){
668
error_t old_errno = errno;
669
error_t ret_errno = raise_privileges();
838
671
errno = old_errno;
841
674
if(setuid(0) == -1){
844
677
errno = old_errno;
848
681
/* Set effective user ID to unprivileged saved user ID */
849
682
__attribute__((warn_unused_result))
850
int lower_privileges(void){
851
int old_errno = errno;
683
error_t lower_privileges(void){
684
error_t old_errno = errno;
685
error_t ret_errno = 0;
853
686
if(seteuid(uid) == -1){
856
689
errno = old_errno;
860
693
/* Lower privileges permanently */
861
694
__attribute__((warn_unused_result))
862
int lower_privileges_permanently(void){
863
int old_errno = errno;
695
error_t lower_privileges_permanently(void){
696
error_t old_errno = errno;
697
error_t ret_errno = 0;
865
698
if(setuid(uid) == -1){
868
701
errno = old_errno;
872
/* Helper function to add_local_route() and delete_local_route() */
705
/* Helper function to add_local_route() and remove_local_route() */
873
706
__attribute__((nonnull, warn_unused_result))
874
static bool add_delete_local_route(const bool add,
707
static bool add_remove_local_route(const bool add,
875
708
const char *address,
876
709
AvahiIfIndex if_index){
878
711
char helper[] = "mandos-client-iprouteadddel";
879
712
char add_arg[] = "add";
880
char delete_arg[] = "delete";
881
char debug_flag[] = "--debug";
713
char remove_arg[] = "remove";
882
714
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
883
715
if(pluginhelperdir == NULL){
946
if(helperdir_fd == -1){
948
_exit(EX_UNAVAILABLE);
950
778
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
951
779
helper, O_RDONLY));
953
perror_plus("openat");
955
_exit(EX_UNAVAILABLE);
780
TEMP_FAILURE_RETRY(close(helperdir_fd));
959
782
#pragma GCC diagnostic push
960
783
#pragma GCC diagnostic ignored "-Wcast-qual"
962
785
if(fexecve(helper_fd, (char *const [])
963
{ helper, add ? add_arg : delete_arg, (char *)address,
964
interface, debug ? debug_flag : NULL, NULL },
786
{ helper, add ? add_arg : remove_arg, (char *)address,
787
interface, NULL }, environ) == -1){
967
789
#pragma GCC diagnostic pop
1020
842
__attribute__((nonnull, warn_unused_result))
1021
843
static bool add_local_route(const char *address,
1022
844
AvahiIfIndex if_index){
1024
fprintf_plus(stderr, "Adding route to %s\n", address);
1026
return add_delete_local_route(true, address, if_index);
845
return add_remove_local_route(true, address, if_index);
1029
848
__attribute__((nonnull, warn_unused_result))
1030
static bool delete_local_route(const char *address,
849
static bool remove_local_route(const char *address,
1031
850
AvahiIfIndex if_index){
1033
fprintf_plus(stderr, "Removing route to %s\n", address);
1035
return add_delete_local_route(false, address, if_index);
851
return add_remove_local_route(false, address, if_index);
1038
854
/* Called when a Mandos server is found */
1129
944
goto mandos_end;
947
memset(&to, 0, sizeof(to));
1132
948
if(af == AF_INET6){
1133
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1134
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1135
ret = inet_pton(af, ip, &to6->sin6_addr);
949
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
950
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
1136
951
} else { /* IPv4 */
1137
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1138
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1139
ret = inet_pton(af, ip, &to4->sin_addr);
952
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
953
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
3050
2818
free(interfaces_to_take_down);
3051
2819
free(interfaces_hooks);
3053
void clean_dir_at(int base, const char * const dirname,
3055
struct dirent **direntries = NULL;
3057
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3063
perror_plus("open");
3065
int numentries = scandirat(dir_fd, ".", &direntries,
3066
notdotentries, alphasort);
3067
if(numentries >= 0){
3068
for(int i = 0; i < numentries; i++){
3070
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3071
dirname, direntries[i]->d_name);
3073
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3075
if(errno == EISDIR){
3076
dret = unlinkat(dir_fd, direntries[i]->d_name,
3079
if((dret == -1) and (errno == ENOTEMPTY)
3080
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3081
== 0) and (level == 0)){
3082
/* Recurse only in this special case */
3083
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3087
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3088
direntries[i]->d_name, strerror(errno));
3091
free(direntries[i]);
3094
/* need to clean even if 0 because man page doesn't specify */
3096
if(numentries == -1){
3097
perror_plus("scandirat");
3099
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3100
if(dret == -1 and errno != ENOENT){
3101
perror_plus("rmdir");
3104
perror_plus("scandirat");
3109
2821
/* Removes the GPGME temp directory and all files inside */
3110
2822
if(tempdir != NULL){
3111
clean_dir_at(-1, tempdir, 0);
2823
struct dirent **direntries = NULL;
2824
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
2828
if(tempdir_fd == -1){
2829
perror_plus("open");
2832
#if __GLIBC_PREREQ(2, 15)
2833
int numentries = scandirat(tempdir_fd, ".", &direntries,
2834
notdotentries, alphasort);
2835
#else /* not __GLIBC_PREREQ(2, 15) */
2836
int numentries = scandir(tempdir, &direntries, notdotentries,
2838
#endif /* not __GLIBC_PREREQ(2, 15) */
2839
#else /* not __GLIBC__ */
2840
int numentries = scandir(tempdir, &direntries, notdotentries,
2842
#endif /* not __GLIBC__ */
2843
if(numentries >= 0){
2844
for(int i = 0; i < numentries; i++){
2845
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2847
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2848
" \"%s\", 0): %s\n", tempdir,
2849
direntries[i]->d_name, strerror(errno));
2851
free(direntries[i]);
2854
/* need to clean even if 0 because man page doesn't specify */
2856
if(numentries == -1){
2857
perror_plus("scandir");
2859
ret = rmdir(tempdir);
2860
if(ret == -1 and errno != ENOENT){
2861
perror_plus("rmdir");
2864
TEMP_FAILURE_RETRY(close(tempdir_fd));