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- Committer: Teddy Hogeborn
- Date: 2018-02-06 20:03:50 UTC
- Revision ID: teddy@recompile.se-20180206200350-jzvorueb731xkph3
Update Debian Debhelper compatibility version.
* (debian/compat): Change to "10".
* (debian/compat): Change to "10".
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2015 Teddy Hogeborn
13
* Copyright © 2008-2015 Björn Påhlsson
14
*
15
* This program is free software: you can redistribute it and/or
16
* modify it under the terms of the GNU General Public License as
17
* published by the Free Software Foundation, either version 3 of the
18
* License, or (at your option) any later version.
19
*
20
* This program is distributed in the hope that it will be useful, but
12
* Copyright © 2008-2017 Teddy Hogeborn
13
* Copyright © 2008-2017 Björn Påhlsson
14
*
15
* This file is part of Mandos.
16
*
17
* Mandos is free software: you can redistribute it and/or modify it
18
* under the terms of the GNU General Public License as published by
19
* the Free Software Foundation, either version 3 of the License, or
20
* (at your option) any later version.
21
*
22
* Mandos is distributed in the hope that it will be useful, but
21
23
* WITHOUT ANY WARRANTY; without even the implied warranty of
22
24
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23
25
* General Public License for more details.
24
26
*
25
27
* You should have received a copy of the GNU General Public License
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
28
29
*
29
30
* Contact the authors at <mandos@recompile.se>.
30
31
*/
47
48
strtof(), abort() */
48
49
#include <stdbool.h> /* bool, false, true */
49
50
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strcpy() */
51
asprintf(), strncpy(), strsignal()
52
*/
51
53
#include <sys/ioctl.h> /* ioctl */
52
54
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
55
sockaddr_in6, PF_INET6,
57
59
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
60
inet_pton(), connect(),
59
61
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
61
63
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
64
*/
63
65
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
66
strtoimax() */
65
#include <errno.h> /* perror(), errno,
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
66
72
program_invocation_short_name */
67
73
#include <time.h> /* nanosleep(), time(), sleep() */
68
74
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
513
519
fprintf_plus(stderr, "GnuTLS: %s", string);
514
520
}
515
521
516
__attribute__((nonnull, warn_unused_result))
522
__attribute__((nonnull(1, 2, 4), warn_unused_result))
517
523
static int init_gnutls_global(const char *pubkeyfilename,
518
524
const char *seckeyfilename,
519
525
const char *dhparamsfilename,
525
531
fprintf_plus(stderr, "Initializing GnuTLS\n");
526
532
}
527
533
528
ret = gnutls_global_init();
529
if(ret != GNUTLS_E_SUCCESS){
530
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
531
safer_gnutls_strerror(ret));
532
return -1;
533
}
534
535
534
if(debug){
536
535
/* "Use a log level over 10 to enable all debugging options."
537
536
* - GnuTLS manual
545
544
if(ret != GNUTLS_E_SUCCESS){
546
545
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
547
546
safer_gnutls_strerror(ret));
548
gnutls_global_deinit();
549
547
return -1;
550
548
}
551
549
629
627
safer_gnutls_strerror(ret));
630
628
dhparamsfilename = NULL;
631
629
}
630
free(params.data);
632
631
} while(false);
633
632
}
634
633
if(dhparamsfilename == NULL){
755
754
globalfail:
756
755
757
756
gnutls_certificate_free_credentials(mc->cred);
758
gnutls_global_deinit();
759
757
gnutls_dh_params_deinit(mc->dh_params);
760
758
return -1;
761
759
}
822
820
823
821
/* Set effective uid to 0, return errno */
824
822
__attribute__((warn_unused_result))
825
error_t raise_privileges(void){
826
error_t old_errno = errno;
827
error_t ret_errno = 0;
823
int raise_privileges(void){
824
int old_errno = errno;
825
int ret = 0;
828
826
if(seteuid(0) == -1){
829
ret_errno = errno;
827
ret = errno;
830
828
}
831
829
errno = old_errno;
832
return ret_errno;
830
return ret;
833
831
}
834
832
835
833
/* Set effective and real user ID to 0. Return errno. */
836
834
__attribute__((warn_unused_result))
837
error_t raise_privileges_permanently(void){
838
error_t old_errno = errno;
839
error_t ret_errno = raise_privileges();
840
if(ret_errno != 0){
835
int raise_privileges_permanently(void){
836
int old_errno = errno;
837
int ret = raise_privileges();
838
if(ret != 0){
841
839
errno = old_errno;
842
return ret_errno;
840
return ret;
843
841
}
844
842
if(setuid(0) == -1){
845
ret_errno = errno;
843
ret = errno;
846
844
}
847
845
errno = old_errno;
848
return ret_errno;
846
return ret;
849
847
}
850
848
851
849
/* Set effective user ID to unprivileged saved user ID */
852
850
__attribute__((warn_unused_result))
853
error_t lower_privileges(void){
854
error_t old_errno = errno;
855
error_t ret_errno = 0;
851
int lower_privileges(void){
852
int old_errno = errno;
853
int ret = 0;
856
854
if(seteuid(uid) == -1){
857
ret_errno = errno;
855
ret = errno;
858
856
}
859
857
errno = old_errno;
860
return ret_errno;
858
return ret;
861
859
}
862
860
863
861
/* Lower privileges permanently */
864
862
__attribute__((warn_unused_result))
865
error_t lower_privileges_permanently(void){
866
error_t old_errno = errno;
867
error_t ret_errno = 0;
863
int lower_privileges_permanently(void){
864
int old_errno = errno;
865
int ret = 0;
868
866
if(setuid(uid) == -1){
869
ret_errno = errno;
867
ret = errno;
870
868
}
871
869
errno = old_errno;
872
return ret_errno;
870
return ret;
873
871
}
874
872
875
873
/* Helper function to add_local_route() and delete_local_route() */
1082
1080
bool match = false;
1083
1081
{
1084
1082
char *interface = NULL;
1085
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1086
interface))){
1083
while((interface = argz_next(mc->interfaces,
1084
mc->interfaces_size,
1085
interface))){
1087
1086
if(if_nametoindex(interface) == (unsigned int)if_index){
1088
1087
match = true;
1089
1088
break;
1223
1222
sizeof(struct sockaddr_in));
1224
1223
}
1225
1224
if(ret < 0){
1226
if(errno == ENETUNREACH
1225
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1227
1226
and if_index != AVAHI_IF_UNSPEC
1228
1227
and connect_to == NULL
1229
1228
and not route_added and
1242
1241
with an explicit route added with the server's address.
1243
1242
1244
1243
Avahi bug reference:
1245
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1244
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1246
1245
https://bugs.debian.org/587961
1247
1246
*/
1248
1247
if(debug){
1428
1427
&decrypted_buffer, mc);
1429
1428
if(decrypted_buffer_size >= 0){
1430
1429
1430
clearerr(stdout);
1431
1431
written = 0;
1432
1432
while(written < (size_t) decrypted_buffer_size){
1433
1433
if(quit_now){
1449
1449
}
1450
1450
written += (size_t)ret;
1451
1451
}
1452
ret = fflush(stdout);
1453
if(ret != 0){
1454
int e = errno;
1455
if(debug){
1456
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1457
strerror(errno));
1458
}
1459
errno = e;
1460
goto mandos_end;
1461
}
1452
1462
retval = 0;
1453
1463
}
1454
1464
}
1485
1495
return retval;
1486
1496
}
1487
1497
1488
__attribute__((nonnull))
1489
1498
static void resolve_callback(AvahiSServiceResolver *r,
1490
1499
AvahiIfIndex interface,
1491
1500
AvahiProtocol proto,
1628
1637
__attribute__((nonnull, warn_unused_result))
1629
1638
bool get_flags(const char *ifname, struct ifreq *ifr){
1630
1639
int ret;
1631
error_t ret_errno;
1640
int old_errno;
1632
1641
1633
1642
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1634
1643
if(s < 0){
1635
ret_errno = errno;
1644
old_errno = errno;
1636
1645
perror_plus("socket");
1637
errno = ret_errno;
1646
errno = old_errno;
1638
1647
return false;
1639
1648
}
1640
strcpy(ifr->ifr_name, ifname);
1649
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1650
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1641
1651
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1642
1652
if(ret == -1){
1643
1653
if(debug){
1644
ret_errno = errno;
1654
old_errno = errno;
1645
1655
perror_plus("ioctl SIOCGIFFLAGS");
1646
errno = ret_errno;
1656
errno = old_errno;
1647
1657
}
1648
1658
return false;
1649
1659
}
1913
1923
return;
1914
1924
}
1915
1925
}
1916
#ifdef __GLIBC__
1917
#if __GLIBC_PREREQ(2, 15)
1918
1926
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1919
1927
runnable_hook, alphasort);
1920
#else /* not __GLIBC_PREREQ(2, 15) */
1921
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1922
alphasort);
1923
#endif /* not __GLIBC_PREREQ(2, 15) */
1924
#else /* not __GLIBC__ */
1925
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1926
alphasort);
1927
#endif /* not __GLIBC__ */
1928
1928
if(numhooks == -1){
1929
1929
perror_plus("scandir");
1930
1930
return;
2085
2085
}
2086
2086
2087
2087
__attribute__((nonnull, warn_unused_result))
2088
error_t bring_up_interface(const char *const interface,
2089
const float delay){
2090
error_t old_errno = errno;
2088
int bring_up_interface(const char *const interface,
2089
const float delay){
2090
int old_errno = errno;
2091
2091
int ret;
2092
2092
struct ifreq network;
2093
2093
unsigned int if_index = if_nametoindex(interface);
2103
2103
}
2104
2104
2105
2105
if(not interface_is_up(interface)){
2106
error_t ret_errno = 0, ioctl_errno = 0;
2106
int ret_errno = 0;
2107
int ioctl_errno = 0;
2107
2108
if(not get_flags(interface, &network)){
2108
2109
ret_errno = errno;
2109
2110
fprintf_plus(stderr, "Failed to get flags for interface "
2196
2197
2197
2198
/* Sleep checking until interface is running.
2198
2199
Check every 0.25s, up to total time of delay */
2199
for(int i=0; i < delay * 4; i++){
2200
for(int i = 0; i < delay * 4; i++){
2200
2201
if(interface_is_running(interface)){
2201
2202
break;
2202
2203
}
2212
2213
}
2213
2214
2214
2215
__attribute__((nonnull, warn_unused_result))
2215
error_t take_down_interface(const char *const interface){
2216
error_t old_errno = errno;
2216
int take_down_interface(const char *const interface){
2217
int old_errno = errno;
2217
2218
struct ifreq network;
2218
2219
unsigned int if_index = if_nametoindex(interface);
2219
2220
if(if_index == 0){
2222
2223
return ENXIO;
2223
2224
}
2224
2225
if(interface_is_up(interface)){
2225
error_t ret_errno = 0, ioctl_errno = 0;
2226
int ret_errno = 0;
2227
int ioctl_errno = 0;
2226
2228
if(not get_flags(interface, &network) and debug){
2227
2229
ret_errno = errno;
2228
2230
fprintf_plus(stderr, "Failed to get flags for interface "
2288
2290
2289
2291
int main(int argc, char *argv[]){
2290
2292
mandos_context mc = { .server = NULL, .dh_bits = 0,
2291
.priority = "SECURE256:!CTYPE-X.509:"
2292
"+CTYPE-OPENPGP:!RSA", .current_server = NULL,
2293
.interfaces = NULL, .interfaces_size = 0 };
2293
.priority = "SECURE256:!CTYPE-X.509"
2294
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2295
.current_server = NULL, .interfaces = NULL,
2296
.interfaces_size = 0 };
2294
2297
AvahiSServiceBrowser *sb = NULL;
2295
2298
error_t ret_errno;
2296
2299
int ret;
2477
2480
.args_doc = "",
2478
2481
.doc = "Mandos client -- Get and decrypt"
2479
2482
" passwords from a Mandos server" };
2480
ret = argp_parse(&argp, argc, argv,
2481
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2482
switch(ret){
2483
ret_errno = argp_parse(&argp, argc, argv,
2484
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2485
switch(ret_errno){
2483
2486
case 0:
2484
2487
break;
2485
2488
case ENOMEM:
2486
2489
default:
2487
errno = ret;
2490
errno = ret_errno;
2488
2491
perror_plus("argp_parse");
2489
2492
exitcode = EX_OSERR;
2490
2493
goto end;
2496
2499
2497
2500
{
2498
2501
/* Work around Debian bug #633582:
2499
<http://bugs.debian.org/633582> */
2502
<https://bugs.debian.org/633582> */
2500
2503
2501
2504
/* Re-raise privileges */
2502
ret_errno = raise_privileges();
2503
if(ret_errno != 0){
2504
errno = ret_errno;
2505
ret = raise_privileges();
2506
if(ret != 0){
2507
errno = ret;
2505
2508
perror_plus("Failed to raise privileges");
2506
2509
} else {
2507
2510
struct stat st;
2571
2574
}
2572
2575
2573
2576
/* Lower privileges */
2574
ret_errno = lower_privileges();
2575
if(ret_errno != 0){
2576
errno = ret_errno;
2577
ret = lower_privileges();
2578
if(ret != 0){
2579
errno = ret;
2577
2580
perror_plus("Failed to lower privileges");
2578
2581
}
2579
2582
}
2907
2910
2908
2911
/* Allocate a new server */
2909
2912
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2910
&config, NULL, NULL, &ret_errno);
2913
&config, NULL, NULL, &ret);
2911
2914
2912
2915
/* Free the Avahi configuration data */
2913
2916
avahi_server_config_free(&config);
2916
2919
/* Check if creating the Avahi server object succeeded */
2917
2920
if(mc.server == NULL){
2918
2921
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2919
avahi_strerror(ret_errno));
2922
avahi_strerror(ret));
2920
2923
exitcode = EX_UNAVAILABLE;
2921
2924
goto end;
2922
2925
}
2957
2960
end:
2958
2961
2959
2962
if(debug){
2960
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2963
if(signal_received){
2964
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2965
argv[0], signal_received,
2966
strsignal(signal_received));
2967
} else {
2968
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2969
}
2961
2970
}
2962
2971
2963
2972
/* Cleanup things */
2974
2983
2975
2984
if(gnutls_initialized){
2976
2985
gnutls_certificate_free_credentials(mc.cred);
2977
gnutls_global_deinit();
2978
2986
gnutls_dh_params_deinit(mc.dh_params);
2979
2987
}
2980
2988
3003
3011
3004
3012
/* Re-raise privileges */
3005
3013
{
3006
ret_errno = raise_privileges();
3007
if(ret_errno != 0){
3008
errno = ret_errno;
3014
ret = raise_privileges();
3015
if(ret != 0){
3016
errno = ret;
3009
3017
perror_plus("Failed to raise privileges");
3010
3018
} else {
3011
3019
3016
3024
/* Take down the network interfaces which were brought up */
3017
3025
{
3018
3026
char *interface = NULL;
3019
while((interface=argz_next(interfaces_to_take_down,
3020
interfaces_to_take_down_size,
3021
interface))){
3022
ret_errno = take_down_interface(interface);
3023
if(ret_errno != 0){
3024
errno = ret_errno;
3027
while((interface = argz_next(interfaces_to_take_down,
3028
interfaces_to_take_down_size,
3029
interface))){
3030
ret = take_down_interface(interface);
3031
if(ret != 0){
3032
errno = ret;
3025
3033
perror_plus("Failed to take down interface");
3026
3034
}
3027
3035
}
3032
3040
}
3033
3041
}
3034
3042
3035
ret_errno = lower_privileges_permanently();
3036
if(ret_errno != 0){
3037
errno = ret_errno;
3043
ret = lower_privileges_permanently();
3044
if(ret != 0){
3045
errno = ret;
3038
3046
perror_plus("Failed to lower privileges permanently");
3039
3047
}
3040
3048
}
3042
3050
free(interfaces_to_take_down);
3043
3051
free(interfaces_hooks);
3044
3052
3053
void clean_dir_at(int base, const char * const dirname,
3054
uintmax_t level){
3055
struct dirent **direntries = NULL;
3056
int dret;
3057
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3058
O_RDONLY
3059
| O_NOFOLLOW
3060
| O_DIRECTORY
3061
| O_PATH));
3062
if(dir_fd == -1){
3063
perror_plus("open");
3064
}
3065
int numentries = scandirat(dir_fd, ".", &direntries,
3066
notdotentries, alphasort);
3067
if(numentries >= 0){
3068
for(int i = 0; i < numentries; i++){
3069
if(debug){
3070
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3071
dirname, direntries[i]->d_name);
3072
}
3073
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3074
if(dret == -1){
3075
if(errno == EISDIR){
3076
dret = unlinkat(dir_fd, direntries[i]->d_name,
3077
AT_REMOVEDIR);
3078
}
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);
3084
dret = 0;
3085
}
3086
if(dret == -1){
3087
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3088
direntries[i]->d_name, strerror(errno));
3089
}
3090
}
3091
free(direntries[i]);
3092
}
3093
3094
/* need to clean even if 0 because man page doesn't specify */
3095
free(direntries);
3096
if(numentries == -1){
3097
perror_plus("scandirat");
3098
}
3099
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3100
if(dret == -1 and errno != ENOENT){
3101
perror_plus("rmdir");
3102
}
3103
} else {
3104
perror_plus("scandirat");
3105
}
3106
close(dir_fd);
3107
}
3108
3045
3109
/* Removes the GPGME temp directory and all files inside */
3046
3110
if(tempdir != NULL){
3047
struct dirent **direntries = NULL;
3048
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3049
| O_NOFOLLOW
3050
| O_DIRECTORY
3051
| O_PATH));
3052
if(tempdir_fd == -1){
3053
perror_plus("open");
3054
} else {
3055
#ifdef __GLIBC__
3056
#if __GLIBC_PREREQ(2, 15)
3057
int numentries = scandirat(tempdir_fd, ".", &direntries,
3058
notdotentries, alphasort);
3059
#else /* not __GLIBC_PREREQ(2, 15) */
3060
int numentries = scandir(tempdir, &direntries, notdotentries,
3061
alphasort);
3062
#endif /* not __GLIBC_PREREQ(2, 15) */
3063
#else /* not __GLIBC__ */
3064
int numentries = scandir(tempdir, &direntries, notdotentries,
3065
alphasort);
3066
#endif /* not __GLIBC__ */
3067
if(numentries >= 0){
3068
for(int i = 0; i < numentries; i++){
3069
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
3070
if(ret == -1){
3071
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
3072
" \"%s\", 0): %s\n", tempdir,
3073
direntries[i]->d_name, strerror(errno));
3074
}
3075
free(direntries[i]);
3076
}
3077
3078
/* need to clean even if 0 because man page doesn't specify */
3079
free(direntries);
3080
if(numentries == -1){
3081
perror_plus("scandir");
3082
}
3083
ret = rmdir(tempdir);
3084
if(ret == -1 and errno != ENOENT){
3085
perror_plus("rmdir");
3086
}
3087
}
3088
close(tempdir_fd);
3089
}
3111
clean_dir_at(-1, tempdir, 0);
3090
3112
}
3091
3113
3092
3114
if(quit_now){
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Version: 2.0.2.dev0