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- Committer: Teddy Hogeborn
- Date: 2015-10-04 13:44:03 UTC
- Revision ID: teddy@recompile.se-20151004134403-jn72bwgbw3aocllk
* initramfs-tools-hook: Don't try to chmod symlinks.
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,
420
414
if(result == NULL){
421
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
422
416
} else {
423
if(result->unsupported_algorithm != NULL) {
424
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
425
result->unsupported_algorithm);
426
}
417
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
418
result->unsupported_algorithm);
427
419
fprintf_plus(stderr, "Wrong key usage: %u\n",
428
420
result->wrong_key_usage);
429
421
if(result->file_name != NULL){
521
513
fprintf_plus(stderr, "GnuTLS: %s", string);
522
514
}
523
515
524
__attribute__((nonnull(1, 2, 4), warn_unused_result))
516
__attribute__((nonnull, warn_unused_result))
525
517
static int init_gnutls_global(const char *pubkeyfilename,
526
518
const char *seckeyfilename,
527
519
const char *dhparamsfilename,
533
525
fprintf_plus(stderr, "Initializing GnuTLS\n");
534
526
}
535
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
536
535
if(debug){
537
536
/* "Use a log level over 10 to enable all debugging options."
538
537
* - GnuTLS manual
546
545
if(ret != GNUTLS_E_SUCCESS){
547
546
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
548
547
safer_gnutls_strerror(ret));
548
gnutls_global_deinit();
549
549
return -1;
550
550
}
551
551
615
615
}
616
616
params.size += (unsigned int)bytes_read;
617
617
}
618
ret = close(dhpfile);
619
if(ret == -1){
620
perror_plus("close");
621
}
622
618
if(params.data == NULL){
623
619
dhparamsfilename = NULL;
624
620
}
633
629
safer_gnutls_strerror(ret));
634
630
dhparamsfilename = NULL;
635
631
}
636
free(params.data);
637
632
} while(false);
638
633
}
639
634
if(dhparamsfilename == NULL){
760
755
globalfail:
761
756
762
757
gnutls_certificate_free_credentials(mc->cred);
758
gnutls_global_deinit();
763
759
gnutls_dh_params_deinit(mc->dh_params);
764
760
return -1;
765
761
}
826
822
827
823
/* Set effective uid to 0, return errno */
828
824
__attribute__((warn_unused_result))
829
int raise_privileges(void){
830
int old_errno = errno;
831
int ret = 0;
825
error_t raise_privileges(void){
826
error_t old_errno = errno;
827
error_t ret_errno = 0;
832
828
if(seteuid(0) == -1){
833
ret = errno;
829
ret_errno = errno;
834
830
}
835
831
errno = old_errno;
836
return ret;
832
return ret_errno;
837
833
}
838
834
839
835
/* Set effective and real user ID to 0. Return errno. */
840
836
__attribute__((warn_unused_result))
841
int raise_privileges_permanently(void){
842
int old_errno = errno;
843
int ret = raise_privileges();
844
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){
845
841
errno = old_errno;
846
return ret;
842
return ret_errno;
847
843
}
848
844
if(setuid(0) == -1){
849
ret = errno;
845
ret_errno = errno;
850
846
}
851
847
errno = old_errno;
852
return ret;
848
return ret_errno;
853
849
}
854
850
855
851
/* Set effective user ID to unprivileged saved user ID */
856
852
__attribute__((warn_unused_result))
857
int lower_privileges(void){
858
int old_errno = errno;
859
int ret = 0;
853
error_t lower_privileges(void){
854
error_t old_errno = errno;
855
error_t ret_errno = 0;
860
856
if(seteuid(uid) == -1){
861
ret = errno;
857
ret_errno = errno;
862
858
}
863
859
errno = old_errno;
864
return ret;
860
return ret_errno;
865
861
}
866
862
867
863
/* Lower privileges permanently */
868
864
__attribute__((warn_unused_result))
869
int lower_privileges_permanently(void){
870
int old_errno = errno;
871
int ret = 0;
865
error_t lower_privileges_permanently(void){
866
error_t old_errno = errno;
867
error_t ret_errno = 0;
872
868
if(setuid(uid) == -1){
873
ret = errno;
869
ret_errno = errno;
874
870
}
875
871
errno = old_errno;
876
return ret;
872
return ret_errno;
877
873
}
878
874
879
875
/* Helper function to add_local_route() and delete_local_route() */
1086
1082
bool match = false;
1087
1083
{
1088
1084
char *interface = NULL;
1089
while((interface = argz_next(mc->interfaces,
1090
mc->interfaces_size,
1091
interface))){
1085
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1086
interface))){
1092
1087
if(if_nametoindex(interface) == (unsigned int)if_index){
1093
1088
match = true;
1094
1089
break;
1228
1223
sizeof(struct sockaddr_in));
1229
1224
}
1230
1225
if(ret < 0){
1231
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1226
if(errno == ENETUNREACH
1232
1227
and if_index != AVAHI_IF_UNSPEC
1233
1228
and connect_to == NULL
1234
1229
and not route_added and
1247
1242
with an explicit route added with the server's address.
1248
1243
1249
1244
Avahi bug reference:
1250
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1245
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1251
1246
https://bugs.debian.org/587961
1252
1247
*/
1253
1248
if(debug){
1433
1428
&decrypted_buffer, mc);
1434
1429
if(decrypted_buffer_size >= 0){
1435
1430
1436
clearerr(stdout);
1437
1431
written = 0;
1438
1432
while(written < (size_t) decrypted_buffer_size){
1439
1433
if(quit_now){
1455
1449
}
1456
1450
written += (size_t)ret;
1457
1451
}
1458
ret = fflush(stdout);
1459
if(ret != 0){
1460
int e = errno;
1461
if(debug){
1462
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1463
strerror(errno));
1464
}
1465
errno = e;
1466
goto mandos_end;
1467
}
1468
1452
retval = 0;
1469
1453
}
1470
1454
}
1501
1485
return retval;
1502
1486
}
1503
1487
1488
__attribute__((nonnull))
1504
1489
static void resolve_callback(AvahiSServiceResolver *r,
1505
1490
AvahiIfIndex interface,
1506
1491
AvahiProtocol proto,
1643
1628
__attribute__((nonnull, warn_unused_result))
1644
1629
bool get_flags(const char *ifname, struct ifreq *ifr){
1645
1630
int ret;
1646
int old_errno;
1631
error_t ret_errno;
1647
1632
1648
1633
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1649
1634
if(s < 0){
1650
old_errno = errno;
1635
ret_errno = errno;
1651
1636
perror_plus("socket");
1652
errno = old_errno;
1637
errno = ret_errno;
1653
1638
return false;
1654
1639
}
1655
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1656
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1640
strcpy(ifr->ifr_name, ifname);
1657
1641
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1658
1642
if(ret == -1){
1659
1643
if(debug){
1660
old_errno = errno;
1644
ret_errno = errno;
1661
1645
perror_plus("ioctl SIOCGIFFLAGS");
1662
errno = old_errno;
1663
}
1664
if((close(s) == -1) and debug){
1665
old_errno = errno;
1666
perror_plus("close");
1667
errno = old_errno;
1646
errno = ret_errno;
1668
1647
}
1669
1648
return false;
1670
1649
}
1671
if((close(s) == -1) and debug){
1672
old_errno = errno;
1673
perror_plus("close");
1674
errno = old_errno;
1675
}
1676
1650
return true;
1677
1651
}
1678
1652
1939
1913
return;
1940
1914
}
1941
1915
}
1942
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1943
if(devnull == -1){
1944
perror_plus("open(\"/dev/null\", O_RDONLY)");
1945
return;
1946
}
1916
#ifdef __GLIBC__
1917
#if __GLIBC_PREREQ(2, 15)
1947
1918
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1948
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__ */
1949
1928
if(numhooks == -1){
1950
1929
perror_plus("scandir");
1951
close(devnull);
1952
1930
return;
1953
1931
}
1954
1932
struct dirent *direntry;
1955
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
}
1956
1939
for(int i = 0; i < numhooks; i++){
1957
1940
direntry = direntries[i];
1958
1941
if(debug){
2102
2085
}
2103
2086
2104
2087
__attribute__((nonnull, warn_unused_result))
2105
int bring_up_interface(const char *const interface,
2106
const float delay){
2107
int old_errno = errno;
2088
error_t bring_up_interface(const char *const interface,
2089
const float delay){
2090
error_t old_errno = errno;
2108
2091
int ret;
2109
2092
struct ifreq network;
2110
2093
unsigned int if_index = if_nametoindex(interface);
2120
2103
}
2121
2104
2122
2105
if(not interface_is_up(interface)){
2123
int ret_errno = 0;
2124
int ioctl_errno = 0;
2106
error_t ret_errno = 0, ioctl_errno = 0;
2125
2107
if(not get_flags(interface, &network)){
2126
2108
ret_errno = errno;
2127
2109
fprintf_plus(stderr, "Failed to get flags for interface "
2214
2196
2215
2197
/* Sleep checking until interface is running.
2216
2198
Check every 0.25s, up to total time of delay */
2217
for(int i = 0; i < delay * 4; i++){
2199
for(int i=0; i < delay * 4; i++){
2218
2200
if(interface_is_running(interface)){
2219
2201
break;
2220
2202
}
2230
2212
}
2231
2213
2232
2214
__attribute__((nonnull, warn_unused_result))
2233
int take_down_interface(const char *const interface){
2234
int old_errno = errno;
2215
error_t take_down_interface(const char *const interface){
2216
error_t old_errno = errno;
2235
2217
struct ifreq network;
2236
2218
unsigned int if_index = if_nametoindex(interface);
2237
2219
if(if_index == 0){
2240
2222
return ENXIO;
2241
2223
}
2242
2224
if(interface_is_up(interface)){
2243
int ret_errno = 0;
2244
int ioctl_errno = 0;
2225
error_t ret_errno = 0, ioctl_errno = 0;
2245
2226
if(not get_flags(interface, &network) and debug){
2246
2227
ret_errno = errno;
2247
2228
fprintf_plus(stderr, "Failed to get flags for interface "
2497
2478
.args_doc = "",
2498
2479
.doc = "Mandos client -- Get and decrypt"
2499
2480
" passwords from a Mandos server" };
2500
ret_errno = argp_parse(&argp, argc, argv,
2501
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2502
switch(ret_errno){
2481
ret = argp_parse(&argp, argc, argv,
2482
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2483
switch(ret){
2503
2484
case 0:
2504
2485
break;
2505
2486
case ENOMEM:
2506
2487
default:
2507
errno = ret_errno;
2488
errno = ret;
2508
2489
perror_plus("argp_parse");
2509
2490
exitcode = EX_OSERR;
2510
2491
goto end;
2516
2497
2517
2498
{
2518
2499
/* Work around Debian bug #633582:
2519
<https://bugs.debian.org/633582> */
2500
<http://bugs.debian.org/633582> */
2520
2501
2521
2502
/* Re-raise privileges */
2522
ret = raise_privileges();
2523
if(ret != 0){
2524
errno = ret;
2503
ret_errno = raise_privileges();
2504
if(ret_errno != 0){
2505
errno = ret_errno;
2525
2506
perror_plus("Failed to raise privileges");
2526
2507
} else {
2527
2508
struct stat st;
2591
2572
}
2592
2573
2593
2574
/* Lower privileges */
2594
ret = lower_privileges();
2595
if(ret != 0){
2596
errno = ret;
2575
ret_errno = lower_privileges();
2576
if(ret_errno != 0){
2577
errno = ret_errno;
2597
2578
perror_plus("Failed to lower privileges");
2598
2579
}
2599
2580
}
2927
2908
2928
2909
/* Allocate a new server */
2929
2910
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2930
&config, NULL, NULL, &ret);
2911
&config, NULL, NULL, &ret_errno);
2931
2912
2932
2913
/* Free the Avahi configuration data */
2933
2914
avahi_server_config_free(&config);
2936
2917
/* Check if creating the Avahi server object succeeded */
2937
2918
if(mc.server == NULL){
2938
2919
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2939
avahi_strerror(ret));
2920
avahi_strerror(ret_errno));
2940
2921
exitcode = EX_UNAVAILABLE;
2941
2922
goto end;
2942
2923
}
2977
2958
end:
2978
2959
2979
2960
if(debug){
2980
if(signal_received){
2981
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2982
argv[0], signal_received,
2983
strsignal(signal_received));
2984
} else {
2985
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2986
}
2961
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2987
2962
}
2988
2963
2989
2964
/* Cleanup things */
3000
2975
3001
2976
if(gnutls_initialized){
3002
2977
gnutls_certificate_free_credentials(mc.cred);
2978
gnutls_global_deinit();
3003
2979
gnutls_dh_params_deinit(mc.dh_params);
3004
2980
}
3005
2981
3028
3004
3029
3005
/* Re-raise privileges */
3030
3006
{
3031
ret = raise_privileges();
3032
if(ret != 0){
3033
errno = ret;
3007
ret_errno = raise_privileges();
3008
if(ret_errno != 0){
3009
errno = ret_errno;
3034
3010
perror_plus("Failed to raise privileges");
3035
3011
} else {
3036
3012
3041
3017
/* Take down the network interfaces which were brought up */
3042
3018
{
3043
3019
char *interface = NULL;
3044
while((interface = argz_next(interfaces_to_take_down,
3045
interfaces_to_take_down_size,
3046
interface))){
3047
ret = take_down_interface(interface);
3048
if(ret != 0){
3049
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;
3050
3026
perror_plus("Failed to take down interface");
3051
3027
}
3052
3028
}
3057
3033
}
3058
3034
}
3059
3035
3060
ret = lower_privileges_permanently();
3061
if(ret != 0){
3062
errno = ret;
3036
ret_errno = lower_privileges_permanently();
3037
if(ret_errno != 0){
3038
errno = ret_errno;
3063
3039
perror_plus("Failed to lower privileges permanently");
3064
3040
}
3065
3041
}
3067
3043
free(interfaces_to_take_down);
3068
3044
free(interfaces_hooks);
3069
3045
3070
void clean_dir_at(int base, const char * const dirname,
3071
uintmax_t level){
3072
struct dirent **direntries = NULL;
3073
int dret;
3074
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3075
O_RDONLY
3076
| O_NOFOLLOW
3077
| O_DIRECTORY
3078
| O_PATH));
3079
if(dir_fd == -1){
3080
perror_plus("open");
3081
return;
3082
}
3083
int numentries = scandirat(dir_fd, ".", &direntries,
3084
notdotentries, alphasort);
3085
if(numentries >= 0){
3086
for(int i = 0; i < numentries; i++){
3087
if(debug){
3088
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3089
dirname, direntries[i]->d_name);
3090
}
3091
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3092
if(dret == -1){
3093
if(errno == EISDIR){
3094
dret = unlinkat(dir_fd, direntries[i]->d_name,
3095
AT_REMOVEDIR);
3096
}
3097
if((dret == -1) and (errno == ENOTEMPTY)
3098
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3099
== 0) and (level == 0)){
3100
/* Recurse only in this special case */
3101
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3102
dret = 0;
3103
}
3104
if((dret == -1) and (errno != ENOENT)){
3105
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3106
direntries[i]->d_name, strerror(errno));
3107
}
3108
}
3109
free(direntries[i]);
3110
}
3111
3112
/* need to clean even if 0 because man page doesn't specify */
3113
free(direntries);
3114
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3115
if(dret == -1 and errno != ENOENT){
3116
perror_plus("rmdir");
3117
}
3118
} else {
3119
perror_plus("scandirat");
3120
}
3121
close(dir_fd);
3122
}
3123
3124
3046
/* Removes the GPGME temp directory and all files inside */
3125
3047
if(tempdir != NULL){
3126
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
}
3127
3091
}
3128
3092
3129
3093
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0