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- Committer: Teddy Hogeborn
- Date: 2015-12-06 04:09:43 UTC
- Revision ID: teddy@recompile.se-20151206040943-n08v1uym0d3h23u9
* mandos.xml (FILES): Removed duplicate entry for “/dev/log”.
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2018 Teddy Hogeborn
13
* Copyright © 2008-2018 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
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
23
21
* WITHOUT ANY WARRANTY; without even the implied warranty of
24
22
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25
23
* General Public License for more details.
26
24
*
27
25
* You should have received a copy of the GNU General Public License
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
29
28
*
30
29
* Contact the authors at <mandos@recompile.se>.
31
30
*/
48
47
strtof(), abort() */
49
48
#include <stdbool.h> /* bool, false, true */
50
49
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
50
asprintf(), strcpy() */
53
51
#include <sys/ioctl.h> /* ioctl */
54
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
55
53
sockaddr_in6, PF_INET6,
59
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
60
58
inet_pton(), connect(),
61
59
getnameinfo() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
#include <fcntl.h> /* open(), unlinkat() */
63
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
64
62
*/
65
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
66
64
strtoimax() */
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
65
#include <errno.h> /* perror(), errno,
72
66
program_invocation_short_name */
73
67
#include <time.h> /* nanosleep(), time(), sleep() */
74
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
519
513
fprintf_plus(stderr, "GnuTLS: %s", string);
520
514
}
521
515
522
__attribute__((nonnull(1, 2, 4), warn_unused_result))
516
__attribute__((nonnull, warn_unused_result))
523
517
static int init_gnutls_global(const char *pubkeyfilename,
524
518
const char *seckeyfilename,
525
519
const char *dhparamsfilename,
531
525
fprintf_plus(stderr, "Initializing GnuTLS\n");
532
526
}
533
527
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
534
535
if(debug){
535
536
/* "Use a log level over 10 to enable all debugging options."
536
537
* - GnuTLS manual
544
545
if(ret != GNUTLS_E_SUCCESS){
545
546
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
546
547
safer_gnutls_strerror(ret));
548
gnutls_global_deinit();
547
549
return -1;
548
550
}
549
551
627
629
safer_gnutls_strerror(ret));
628
630
dhparamsfilename = NULL;
629
631
}
630
free(params.data);
631
632
} while(false);
632
633
}
633
634
if(dhparamsfilename == NULL){
754
755
globalfail:
755
756
756
757
gnutls_certificate_free_credentials(mc->cred);
758
gnutls_global_deinit();
757
759
gnutls_dh_params_deinit(mc->dh_params);
758
760
return -1;
759
761
}
820
822
821
823
/* Set effective uid to 0, return errno */
822
824
__attribute__((warn_unused_result))
823
int raise_privileges(void){
824
int old_errno = errno;
825
int ret = 0;
825
error_t raise_privileges(void){
826
error_t old_errno = errno;
827
error_t ret_errno = 0;
826
828
if(seteuid(0) == -1){
827
ret = errno;
829
ret_errno = errno;
828
830
}
829
831
errno = old_errno;
830
return ret;
832
return ret_errno;
831
833
}
832
834
833
835
/* Set effective and real user ID to 0. Return errno. */
834
836
__attribute__((warn_unused_result))
835
int raise_privileges_permanently(void){
836
int old_errno = errno;
837
int ret = raise_privileges();
838
if(ret != 0){
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){
839
841
errno = old_errno;
840
return ret;
842
return ret_errno;
841
843
}
842
844
if(setuid(0) == -1){
843
ret = errno;
845
ret_errno = errno;
844
846
}
845
847
errno = old_errno;
846
return ret;
848
return ret_errno;
847
849
}
848
850
849
851
/* Set effective user ID to unprivileged saved user ID */
850
852
__attribute__((warn_unused_result))
851
int lower_privileges(void){
852
int old_errno = errno;
853
int ret = 0;
853
error_t lower_privileges(void){
854
error_t old_errno = errno;
855
error_t ret_errno = 0;
854
856
if(seteuid(uid) == -1){
855
ret = errno;
857
ret_errno = errno;
856
858
}
857
859
errno = old_errno;
858
return ret;
860
return ret_errno;
859
861
}
860
862
861
863
/* Lower privileges permanently */
862
864
__attribute__((warn_unused_result))
863
int lower_privileges_permanently(void){
864
int old_errno = errno;
865
int ret = 0;
865
error_t lower_privileges_permanently(void){
866
error_t old_errno = errno;
867
error_t ret_errno = 0;
866
868
if(setuid(uid) == -1){
867
ret = errno;
869
ret_errno = errno;
868
870
}
869
871
errno = old_errno;
870
return ret;
872
return ret_errno;
871
873
}
872
874
873
875
/* Helper function to add_local_route() and delete_local_route() */
1080
1082
bool match = false;
1081
1083
{
1082
1084
char *interface = NULL;
1083
while((interface = argz_next(mc->interfaces,
1084
mc->interfaces_size,
1085
interface))){
1085
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1086
interface))){
1086
1087
if(if_nametoindex(interface) == (unsigned int)if_index){
1087
1088
match = true;
1088
1089
break;
1241
1242
with an explicit route added with the server's address.
1242
1243
1243
1244
Avahi bug reference:
1244
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1245
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1245
1246
https://bugs.debian.org/587961
1246
1247
*/
1247
1248
if(debug){
1427
1428
&decrypted_buffer, mc);
1428
1429
if(decrypted_buffer_size >= 0){
1429
1430
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
}
1462
1452
retval = 0;
1463
1453
}
1464
1454
}
1495
1485
return retval;
1496
1486
}
1497
1487
1488
__attribute__((nonnull))
1498
1489
static void resolve_callback(AvahiSServiceResolver *r,
1499
1490
AvahiIfIndex interface,
1500
1491
AvahiProtocol proto,
1637
1628
__attribute__((nonnull, warn_unused_result))
1638
1629
bool get_flags(const char *ifname, struct ifreq *ifr){
1639
1630
int ret;
1640
int old_errno;
1631
error_t ret_errno;
1641
1632
1642
1633
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1643
1634
if(s < 0){
1644
old_errno = errno;
1635
ret_errno = errno;
1645
1636
perror_plus("socket");
1646
errno = old_errno;
1637
errno = ret_errno;
1647
1638
return false;
1648
1639
}
1649
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1650
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1640
strcpy(ifr->ifr_name, ifname);
1651
1641
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1652
1642
if(ret == -1){
1653
1643
if(debug){
1654
old_errno = errno;
1644
ret_errno = errno;
1655
1645
perror_plus("ioctl SIOCGIFFLAGS");
1656
errno = old_errno;
1646
errno = ret_errno;
1657
1647
}
1658
1648
return false;
1659
1649
}
1923
1913
return;
1924
1914
}
1925
1915
}
1926
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1927
if(devnull == -1){
1928
perror_plus("open(\"/dev/null\", O_RDONLY)");
1929
return;
1930
}
1916
#ifdef __GLIBC__
1917
#if __GLIBC_PREREQ(2, 15)
1931
1918
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1932
1919
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__ */
1933
1928
if(numhooks == -1){
1934
1929
perror_plus("scandir");
1935
close(devnull);
1936
1930
return;
1937
1931
}
1938
1932
struct dirent *direntry;
1939
1933
int ret;
1934
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1935
if(devnull == -1){
1936
perror_plus("open(\"/dev/null\", O_RDONLY)");
1937
return;
1938
}
1940
1939
for(int i = 0; i < numhooks; i++){
1941
1940
direntry = direntries[i];
1942
1941
if(debug){
2086
2085
}
2087
2086
2088
2087
__attribute__((nonnull, warn_unused_result))
2089
int bring_up_interface(const char *const interface,
2090
const float delay){
2091
int old_errno = errno;
2088
error_t bring_up_interface(const char *const interface,
2089
const float delay){
2090
error_t 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
int ret_errno = 0;
2108
int ioctl_errno = 0;
2106
error_t ret_errno = 0, ioctl_errno = 0;
2109
2107
if(not get_flags(interface, &network)){
2110
2108
ret_errno = errno;
2111
2109
fprintf_plus(stderr, "Failed to get flags for interface "
2198
2196
2199
2197
/* Sleep checking until interface is running.
2200
2198
Check every 0.25s, up to total time of delay */
2201
for(int i = 0; i < delay * 4; i++){
2199
for(int i=0; i < delay * 4; i++){
2202
2200
if(interface_is_running(interface)){
2203
2201
break;
2204
2202
}
2214
2212
}
2215
2213
2216
2214
__attribute__((nonnull, warn_unused_result))
2217
int take_down_interface(const char *const interface){
2218
int old_errno = errno;
2215
error_t take_down_interface(const char *const interface){
2216
error_t old_errno = errno;
2219
2217
struct ifreq network;
2220
2218
unsigned int if_index = if_nametoindex(interface);
2221
2219
if(if_index == 0){
2224
2222
return ENXIO;
2225
2223
}
2226
2224
if(interface_is_up(interface)){
2227
int ret_errno = 0;
2228
int ioctl_errno = 0;
2225
error_t ret_errno = 0, ioctl_errno = 0;
2229
2226
if(not get_flags(interface, &network) and debug){
2230
2227
ret_errno = errno;
2231
2228
fprintf_plus(stderr, "Failed to get flags for interface "
2481
2478
.args_doc = "",
2482
2479
.doc = "Mandos client -- Get and decrypt"
2483
2480
" passwords from a Mandos server" };
2484
ret_errno = argp_parse(&argp, argc, argv,
2485
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2486
switch(ret_errno){
2481
ret = argp_parse(&argp, argc, argv,
2482
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2483
switch(ret){
2487
2484
case 0:
2488
2485
break;
2489
2486
case ENOMEM:
2490
2487
default:
2491
errno = ret_errno;
2488
errno = ret;
2492
2489
perror_plus("argp_parse");
2493
2490
exitcode = EX_OSERR;
2494
2491
goto end;
2500
2497
2501
2498
{
2502
2499
/* Work around Debian bug #633582:
2503
<https://bugs.debian.org/633582> */
2500
<http://bugs.debian.org/633582> */
2504
2501
2505
2502
/* Re-raise privileges */
2506
ret = raise_privileges();
2507
if(ret != 0){
2508
errno = ret;
2503
ret_errno = raise_privileges();
2504
if(ret_errno != 0){
2505
errno = ret_errno;
2509
2506
perror_plus("Failed to raise privileges");
2510
2507
} else {
2511
2508
struct stat st;
2575
2572
}
2576
2573
2577
2574
/* Lower privileges */
2578
ret = lower_privileges();
2579
if(ret != 0){
2580
errno = ret;
2575
ret_errno = lower_privileges();
2576
if(ret_errno != 0){
2577
errno = ret_errno;
2581
2578
perror_plus("Failed to lower privileges");
2582
2579
}
2583
2580
}
2911
2908
2912
2909
/* Allocate a new server */
2913
2910
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2914
&config, NULL, NULL, &ret);
2911
&config, NULL, NULL, &ret_errno);
2915
2912
2916
2913
/* Free the Avahi configuration data */
2917
2914
avahi_server_config_free(&config);
2920
2917
/* Check if creating the Avahi server object succeeded */
2921
2918
if(mc.server == NULL){
2922
2919
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2923
avahi_strerror(ret));
2920
avahi_strerror(ret_errno));
2924
2921
exitcode = EX_UNAVAILABLE;
2925
2922
goto end;
2926
2923
}
2961
2958
end:
2962
2959
2963
2960
if(debug){
2964
if(signal_received){
2965
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2966
argv[0], signal_received,
2967
strsignal(signal_received));
2968
} else {
2969
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2970
}
2961
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2971
2962
}
2972
2963
2973
2964
/* Cleanup things */
2984
2975
2985
2976
if(gnutls_initialized){
2986
2977
gnutls_certificate_free_credentials(mc.cred);
2978
gnutls_global_deinit();
2987
2979
gnutls_dh_params_deinit(mc.dh_params);
2988
2980
}
2989
2981
3012
3004
3013
3005
/* Re-raise privileges */
3014
3006
{
3015
ret = raise_privileges();
3016
if(ret != 0){
3017
errno = ret;
3007
ret_errno = raise_privileges();
3008
if(ret_errno != 0){
3009
errno = ret_errno;
3018
3010
perror_plus("Failed to raise privileges");
3019
3011
} else {
3020
3012
3025
3017
/* Take down the network interfaces which were brought up */
3026
3018
{
3027
3019
char *interface = NULL;
3028
while((interface = argz_next(interfaces_to_take_down,
3029
interfaces_to_take_down_size,
3030
interface))){
3031
ret = take_down_interface(interface);
3032
if(ret != 0){
3033
errno = ret;
3020
while((interface=argz_next(interfaces_to_take_down,
3021
interfaces_to_take_down_size,
3022
interface))){
3023
ret_errno = take_down_interface(interface);
3024
if(ret_errno != 0){
3025
errno = ret_errno;
3034
3026
perror_plus("Failed to take down interface");
3035
3027
}
3036
3028
}
3041
3033
}
3042
3034
}
3043
3035
3044
ret = lower_privileges_permanently();
3045
if(ret != 0){
3046
errno = ret;
3036
ret_errno = lower_privileges_permanently();
3037
if(ret_errno != 0){
3038
errno = ret_errno;
3047
3039
perror_plus("Failed to lower privileges permanently");
3048
3040
}
3049
3041
}
3051
3043
free(interfaces_to_take_down);
3052
3044
free(interfaces_hooks);
3053
3045
3054
void clean_dir_at(int base, const char * const dirname,
3055
uintmax_t level){
3056
struct dirent **direntries = NULL;
3057
int dret;
3058
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3059
O_RDONLY
3060
| O_NOFOLLOW
3061
| O_DIRECTORY
3062
| O_PATH));
3063
if(dir_fd == -1){
3064
perror_plus("open");
3065
return;
3066
}
3067
int numentries = scandirat(dir_fd, ".", &direntries,
3068
notdotentries, alphasort);
3069
if(numentries >= 0){
3070
for(int i = 0; i < numentries; i++){
3071
if(debug){
3072
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3073
dirname, direntries[i]->d_name);
3074
}
3075
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3076
if(dret == -1){
3077
if(errno == EISDIR){
3078
dret = unlinkat(dir_fd, direntries[i]->d_name,
3079
AT_REMOVEDIR);
3080
}
3081
if((dret == -1) and (errno == ENOTEMPTY)
3082
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3083
== 0) and (level == 0)){
3084
/* Recurse only in this special case */
3085
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3086
dret = 0;
3087
}
3088
if((dret == -1) and (errno != ENOENT)){
3089
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3090
direntries[i]->d_name, strerror(errno));
3091
}
3092
}
3093
free(direntries[i]);
3094
}
3095
3096
/* need to clean even if 0 because man page doesn't specify */
3097
free(direntries);
3098
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3099
if(dret == -1 and errno != ENOENT){
3100
perror_plus("rmdir");
3101
}
3102
} else {
3103
perror_plus("scandirat");
3104
}
3105
close(dir_fd);
3106
}
3107
3108
3046
/* Removes the GPGME temp directory and all files inside */
3109
3047
if(tempdir != NULL){
3110
clean_dir_at(-1, tempdir, 0);
3048
struct dirent **direntries = NULL;
3049
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3050
| O_NOFOLLOW
3051
| O_DIRECTORY
3052
| O_PATH));
3053
if(tempdir_fd == -1){
3054
perror_plus("open");
3055
} else {
3056
#ifdef __GLIBC__
3057
#if __GLIBC_PREREQ(2, 15)
3058
int numentries = scandirat(tempdir_fd, ".", &direntries,
3059
notdotentries, alphasort);
3060
#else /* not __GLIBC_PREREQ(2, 15) */
3061
int numentries = scandir(tempdir, &direntries, notdotentries,
3062
alphasort);
3063
#endif /* not __GLIBC_PREREQ(2, 15) */
3064
#else /* not __GLIBC__ */
3065
int numentries = scandir(tempdir, &direntries, notdotentries,
3066
alphasort);
3067
#endif /* not __GLIBC__ */
3068
if(numentries >= 0){
3069
for(int i = 0; i < numentries; i++){
3070
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
3071
if(ret == -1){
3072
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
3073
" \"%s\", 0): %s\n", tempdir,
3074
direntries[i]->d_name, strerror(errno));
3075
}
3076
free(direntries[i]);
3077
}
3078
3079
/* need to clean even if 0 because man page doesn't specify */
3080
free(direntries);
3081
if(numentries == -1){
3082
perror_plus("scandir");
3083
}
3084
ret = rmdir(tempdir);
3085
if(ret == -1 and errno != ENOENT){
3086
perror_plus("rmdir");
3087
}
3088
}
3089
close(tempdir_fd);
3090
}
3111
3091
}
3112
3092
3113
3093
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0