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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(), strncpy() */
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;
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
1649
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1642
1651
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1643
1652
if(ret == -1){
1644
1653
if(debug){
1645
ret_errno = errno;
1654
old_errno = errno;
1646
1655
perror_plus("ioctl SIOCGIFFLAGS");
1647
errno = ret_errno;
1656
errno = old_errno;
1648
1657
}
1649
1658
return false;
1650
1659
}
1914
1923
return;
1915
1924
}
1916
1925
}
1917
#ifdef __GLIBC__
1918
#if __GLIBC_PREREQ(2, 15)
1919
1926
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1920
1927
runnable_hook, alphasort);
1921
#else /* not __GLIBC_PREREQ(2, 15) */
1922
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1923
alphasort);
1924
#endif /* not __GLIBC_PREREQ(2, 15) */
1925
#else /* not __GLIBC__ */
1926
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1927
alphasort);
1928
#endif /* not __GLIBC__ */
1929
1928
if(numhooks == -1){
1930
1929
perror_plus("scandir");
1931
1930
return;
2086
2085
}
2087
2086
2088
2087
__attribute__((nonnull, warn_unused_result))
2089
error_t bring_up_interface(const char *const interface,
2090
const float delay){
2091
error_t old_errno = errno;
2088
int bring_up_interface(const char *const interface,
2089
const float delay){
2090
int old_errno = errno;
2092
2091
int ret;
2093
2092
struct ifreq network;
2094
2093
unsigned int if_index = if_nametoindex(interface);
2104
2103
}
2105
2104
2106
2105
if(not interface_is_up(interface)){
2107
error_t ret_errno = 0, ioctl_errno = 0;
2106
int ret_errno = 0;
2107
int ioctl_errno = 0;
2108
2108
if(not get_flags(interface, &network)){
2109
2109
ret_errno = errno;
2110
2110
fprintf_plus(stderr, "Failed to get flags for interface "
2197
2197
2198
2198
/* Sleep checking until interface is running.
2199
2199
Check every 0.25s, up to total time of delay */
2200
for(int i=0; i < delay * 4; i++){
2200
for(int i = 0; i < delay * 4; i++){
2201
2201
if(interface_is_running(interface)){
2202
2202
break;
2203
2203
}
2213
2213
}
2214
2214
2215
2215
__attribute__((nonnull, warn_unused_result))
2216
error_t take_down_interface(const char *const interface){
2217
error_t old_errno = errno;
2216
int take_down_interface(const char *const interface){
2217
int old_errno = errno;
2218
2218
struct ifreq network;
2219
2219
unsigned int if_index = if_nametoindex(interface);
2220
2220
if(if_index == 0){
2223
2223
return ENXIO;
2224
2224
}
2225
2225
if(interface_is_up(interface)){
2226
error_t ret_errno = 0, ioctl_errno = 0;
2226
int ret_errno = 0;
2227
int ioctl_errno = 0;
2227
2228
if(not get_flags(interface, &network) and debug){
2228
2229
ret_errno = errno;
2229
2230
fprintf_plus(stderr, "Failed to get flags for interface "
2479
2480
.args_doc = "",
2480
2481
.doc = "Mandos client -- Get and decrypt"
2481
2482
" passwords from a Mandos server" };
2482
ret = argp_parse(&argp, argc, argv,
2483
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2484
switch(ret){
2483
ret_errno = argp_parse(&argp, argc, argv,
2484
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2485
switch(ret_errno){
2485
2486
case 0:
2486
2487
break;
2487
2488
case ENOMEM:
2488
2489
default:
2489
errno = ret;
2490
errno = ret_errno;
2490
2491
perror_plus("argp_parse");
2491
2492
exitcode = EX_OSERR;
2492
2493
goto end;
2498
2499
2499
2500
{
2500
2501
/* Work around Debian bug #633582:
2501
<http://bugs.debian.org/633582> */
2502
<https://bugs.debian.org/633582> */
2502
2503
2503
2504
/* Re-raise privileges */
2504
ret_errno = raise_privileges();
2505
if(ret_errno != 0){
2506
errno = ret_errno;
2505
ret = raise_privileges();
2506
if(ret != 0){
2507
errno = ret;
2507
2508
perror_plus("Failed to raise privileges");
2508
2509
} else {
2509
2510
struct stat st;
2573
2574
}
2574
2575
2575
2576
/* Lower privileges */
2576
ret_errno = lower_privileges();
2577
if(ret_errno != 0){
2578
errno = ret_errno;
2577
ret = lower_privileges();
2578
if(ret != 0){
2579
errno = ret;
2579
2580
perror_plus("Failed to lower privileges");
2580
2581
}
2581
2582
}
2909
2910
2910
2911
/* Allocate a new server */
2911
2912
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2912
&config, NULL, NULL, &ret_errno);
2913
&config, NULL, NULL, &ret);
2913
2914
2914
2915
/* Free the Avahi configuration data */
2915
2916
avahi_server_config_free(&config);
2918
2919
/* Check if creating the Avahi server object succeeded */
2919
2920
if(mc.server == NULL){
2920
2921
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2921
avahi_strerror(ret_errno));
2922
avahi_strerror(ret));
2922
2923
exitcode = EX_UNAVAILABLE;
2923
2924
goto end;
2924
2925
}
2959
2960
end:
2960
2961
2961
2962
if(debug){
2962
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
}
2963
2970
}
2964
2971
2965
2972
/* Cleanup things */
2976
2983
2977
2984
if(gnutls_initialized){
2978
2985
gnutls_certificate_free_credentials(mc.cred);
2979
gnutls_global_deinit();
2980
2986
gnutls_dh_params_deinit(mc.dh_params);
2981
2987
}
2982
2988
3005
3011
3006
3012
/* Re-raise privileges */
3007
3013
{
3008
ret_errno = raise_privileges();
3009
if(ret_errno != 0){
3010
errno = ret_errno;
3014
ret = raise_privileges();
3015
if(ret != 0){
3016
errno = ret;
3011
3017
perror_plus("Failed to raise privileges");
3012
3018
} else {
3013
3019
3018
3024
/* Take down the network interfaces which were brought up */
3019
3025
{
3020
3026
char *interface = NULL;
3021
while((interface=argz_next(interfaces_to_take_down,
3022
interfaces_to_take_down_size,
3023
interface))){
3024
ret_errno = take_down_interface(interface);
3025
if(ret_errno != 0){
3026
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;
3027
3033
perror_plus("Failed to take down interface");
3028
3034
}
3029
3035
}
3034
3040
}
3035
3041
}
3036
3042
3037
ret_errno = lower_privileges_permanently();
3038
if(ret_errno != 0){
3039
errno = ret_errno;
3043
ret = lower_privileges_permanently();
3044
if(ret != 0){
3045
errno = ret;
3040
3046
perror_plus("Failed to lower privileges permanently");
3041
3047
}
3042
3048
}
3044
3050
free(interfaces_to_take_down);
3045
3051
free(interfaces_hooks);
3046
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
3047
3109
/* Removes the GPGME temp directory and all files inside */
3048
3110
if(tempdir != NULL){
3049
struct dirent **direntries = NULL;
3050
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3051
| O_NOFOLLOW
3052
| O_DIRECTORY
3053
| O_PATH));
3054
if(tempdir_fd == -1){
3055
perror_plus("open");
3056
} else {
3057
#ifdef __GLIBC__
3058
#if __GLIBC_PREREQ(2, 15)
3059
int numentries = scandirat(tempdir_fd, ".", &direntries,
3060
notdotentries, alphasort);
3061
#else /* not __GLIBC_PREREQ(2, 15) */
3062
int numentries = scandir(tempdir, &direntries, notdotentries,
3063
alphasort);
3064
#endif /* not __GLIBC_PREREQ(2, 15) */
3065
#else /* not __GLIBC__ */
3066
int numentries = scandir(tempdir, &direntries, notdotentries,
3067
alphasort);
3068
#endif /* not __GLIBC__ */
3069
if(numentries >= 0){
3070
for(int i = 0; i < numentries; i++){
3071
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
3072
if(ret == -1){
3073
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
3074
" \"%s\", 0): %s\n", tempdir,
3075
direntries[i]->d_name, strerror(errno));
3076
}
3077
free(direntries[i]);
3078
}
3079
3080
/* need to clean even if 0 because man page doesn't specify */
3081
free(direntries);
3082
if(numentries == -1){
3083
perror_plus("scandir");
3084
}
3085
ret = rmdir(tempdir);
3086
if(ret == -1 and errno != ENOENT){
3087
perror_plus("rmdir");
3088
}
3089
}
3090
close(tempdir_fd);
3091
}
3111
clean_dir_at(-1, tempdir, 0);
3092
3112
}
3093
3113
3094
3114
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0