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- Committer: Teddy Hogeborn
- Date: 2018-02-22 19:33:54 UTC
- mfrom: (237.4.98 release)
- Revision ID: teddy@recompile.se-20180222193354-uivyobeq4l5wyjt0
Merge from release branch
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2016 Teddy Hogeborn
13
* Copyright © 2008-2016 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 © 2008-2018 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
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
615
613
}
616
614
params.size += (unsigned int)bytes_read;
617
615
}
616
ret = close(dhpfile);
617
if(ret == -1){
618
perror_plus("close");
619
}
618
620
if(params.data == NULL){
619
621
dhparamsfilename = NULL;
620
622
}
629
631
safer_gnutls_strerror(ret));
630
632
dhparamsfilename = NULL;
631
633
}
634
free(params.data);
632
635
} while(false);
633
636
}
634
637
if(dhparamsfilename == NULL){
755
758
globalfail:
756
759
757
760
gnutls_certificate_free_credentials(mc->cred);
758
gnutls_global_deinit();
759
761
gnutls_dh_params_deinit(mc->dh_params);
760
762
return -1;
761
763
}
822
824
823
825
/* Set effective uid to 0, return errno */
824
826
__attribute__((warn_unused_result))
825
error_t raise_privileges(void){
826
error_t old_errno = errno;
827
error_t ret_errno = 0;
827
int raise_privileges(void){
828
int old_errno = errno;
829
int ret = 0;
828
830
if(seteuid(0) == -1){
829
ret_errno = errno;
831
ret = errno;
830
832
}
831
833
errno = old_errno;
832
return ret_errno;
834
return ret;
833
835
}
834
836
835
837
/* Set effective and real user ID to 0. Return errno. */
836
838
__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){
839
int raise_privileges_permanently(void){
840
int old_errno = errno;
841
int ret = raise_privileges();
842
if(ret != 0){
841
843
errno = old_errno;
842
return ret_errno;
844
return ret;
843
845
}
844
846
if(setuid(0) == -1){
845
ret_errno = errno;
847
ret = errno;
846
848
}
847
849
errno = old_errno;
848
return ret_errno;
850
return ret;
849
851
}
850
852
851
853
/* Set effective user ID to unprivileged saved user ID */
852
854
__attribute__((warn_unused_result))
853
error_t lower_privileges(void){
854
error_t old_errno = errno;
855
error_t ret_errno = 0;
855
int lower_privileges(void){
856
int old_errno = errno;
857
int ret = 0;
856
858
if(seteuid(uid) == -1){
857
ret_errno = errno;
859
ret = errno;
858
860
}
859
861
errno = old_errno;
860
return ret_errno;
862
return ret;
861
863
}
862
864
863
865
/* Lower privileges permanently */
864
866
__attribute__((warn_unused_result))
865
error_t lower_privileges_permanently(void){
866
error_t old_errno = errno;
867
error_t ret_errno = 0;
867
int lower_privileges_permanently(void){
868
int old_errno = errno;
869
int ret = 0;
868
870
if(setuid(uid) == -1){
869
ret_errno = errno;
871
ret = errno;
870
872
}
871
873
errno = old_errno;
872
return ret_errno;
874
return ret;
873
875
}
874
876
875
877
/* Helper function to add_local_route() and delete_local_route() */
1082
1084
bool match = false;
1083
1085
{
1084
1086
char *interface = NULL;
1085
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1086
interface))){
1087
while((interface = argz_next(mc->interfaces,
1088
mc->interfaces_size,
1089
interface))){
1087
1090
if(if_nametoindex(interface) == (unsigned int)if_index){
1088
1091
match = true;
1089
1092
break;
1242
1245
with an explicit route added with the server's address.
1243
1246
1244
1247
Avahi bug reference:
1245
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1248
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1246
1249
https://bugs.debian.org/587961
1247
1250
*/
1248
1251
if(debug){
1428
1431
&decrypted_buffer, mc);
1429
1432
if(decrypted_buffer_size >= 0){
1430
1433
1434
clearerr(stdout);
1431
1435
written = 0;
1432
1436
while(written < (size_t) decrypted_buffer_size){
1433
1437
if(quit_now){
1449
1453
}
1450
1454
written += (size_t)ret;
1451
1455
}
1456
ret = fflush(stdout);
1457
if(ret != 0){
1458
int e = errno;
1459
if(debug){
1460
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1461
strerror(errno));
1462
}
1463
errno = e;
1464
goto mandos_end;
1465
}
1452
1466
retval = 0;
1453
1467
}
1454
1468
}
1485
1499
return retval;
1486
1500
}
1487
1501
1488
__attribute__((nonnull))
1489
1502
static void resolve_callback(AvahiSServiceResolver *r,
1490
1503
AvahiIfIndex interface,
1491
1504
AvahiProtocol proto,
1628
1641
__attribute__((nonnull, warn_unused_result))
1629
1642
bool get_flags(const char *ifname, struct ifreq *ifr){
1630
1643
int ret;
1631
error_t ret_errno;
1644
int old_errno;
1632
1645
1633
1646
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1634
1647
if(s < 0){
1635
ret_errno = errno;
1648
old_errno = errno;
1636
1649
perror_plus("socket");
1637
errno = ret_errno;
1650
errno = old_errno;
1638
1651
return false;
1639
1652
}
1640
1653
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1642
1655
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1643
1656
if(ret == -1){
1644
1657
if(debug){
1645
ret_errno = errno;
1658
old_errno = errno;
1646
1659
perror_plus("ioctl SIOCGIFFLAGS");
1647
errno = ret_errno;
1660
errno = old_errno;
1661
}
1662
if((close(s) == -1) and debug){
1663
old_errno = errno;
1664
perror_plus("close");
1665
errno = old_errno;
1648
1666
}
1649
1667
return false;
1650
1668
}
1669
if((close(s) == -1) and debug){
1670
old_errno = errno;
1671
perror_plus("close");
1672
errno = old_errno;
1673
}
1651
1674
return true;
1652
1675
}
1653
1676
1914
1937
return;
1915
1938
}
1916
1939
}
1940
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1941
if(devnull == -1){
1942
perror_plus("open(\"/dev/null\", O_RDONLY)");
1943
return;
1944
}
1917
1945
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1918
1946
runnable_hook, alphasort);
1919
1947
if(numhooks == -1){
1920
1948
perror_plus("scandir");
1949
close(devnull);
1921
1950
return;
1922
1951
}
1923
1952
struct dirent *direntry;
1924
1953
int ret;
1925
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1926
if(devnull == -1){
1927
perror_plus("open(\"/dev/null\", O_RDONLY)");
1928
return;
1929
}
1930
1954
for(int i = 0; i < numhooks; i++){
1931
1955
direntry = direntries[i];
1932
1956
if(debug){
2076
2100
}
2077
2101
2078
2102
__attribute__((nonnull, warn_unused_result))
2079
error_t bring_up_interface(const char *const interface,
2080
const float delay){
2081
error_t old_errno = errno;
2103
int bring_up_interface(const char *const interface,
2104
const float delay){
2105
int old_errno = errno;
2082
2106
int ret;
2083
2107
struct ifreq network;
2084
2108
unsigned int if_index = if_nametoindex(interface);
2094
2118
}
2095
2119
2096
2120
if(not interface_is_up(interface)){
2097
error_t ret_errno = 0, ioctl_errno = 0;
2121
int ret_errno = 0;
2122
int ioctl_errno = 0;
2098
2123
if(not get_flags(interface, &network)){
2099
2124
ret_errno = errno;
2100
2125
fprintf_plus(stderr, "Failed to get flags for interface "
2187
2212
2188
2213
/* Sleep checking until interface is running.
2189
2214
Check every 0.25s, up to total time of delay */
2190
for(int i=0; i < delay * 4; i++){
2215
for(int i = 0; i < delay * 4; i++){
2191
2216
if(interface_is_running(interface)){
2192
2217
break;
2193
2218
}
2203
2228
}
2204
2229
2205
2230
__attribute__((nonnull, warn_unused_result))
2206
error_t take_down_interface(const char *const interface){
2207
error_t old_errno = errno;
2231
int take_down_interface(const char *const interface){
2232
int old_errno = errno;
2208
2233
struct ifreq network;
2209
2234
unsigned int if_index = if_nametoindex(interface);
2210
2235
if(if_index == 0){
2213
2238
return ENXIO;
2214
2239
}
2215
2240
if(interface_is_up(interface)){
2216
error_t ret_errno = 0, ioctl_errno = 0;
2241
int ret_errno = 0;
2242
int ioctl_errno = 0;
2217
2243
if(not get_flags(interface, &network) and debug){
2218
2244
ret_errno = errno;
2219
2245
fprintf_plus(stderr, "Failed to get flags for interface "
2469
2495
.args_doc = "",
2470
2496
.doc = "Mandos client -- Get and decrypt"
2471
2497
" passwords from a Mandos server" };
2472
ret = argp_parse(&argp, argc, argv,
2473
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2474
switch(ret){
2498
ret_errno = argp_parse(&argp, argc, argv,
2499
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2500
switch(ret_errno){
2475
2501
case 0:
2476
2502
break;
2477
2503
case ENOMEM:
2478
2504
default:
2479
errno = ret;
2505
errno = ret_errno;
2480
2506
perror_plus("argp_parse");
2481
2507
exitcode = EX_OSERR;
2482
2508
goto end;
2488
2514
2489
2515
{
2490
2516
/* Work around Debian bug #633582:
2491
<http://bugs.debian.org/633582> */
2517
<https://bugs.debian.org/633582> */
2492
2518
2493
2519
/* Re-raise privileges */
2494
ret_errno = raise_privileges();
2495
if(ret_errno != 0){
2496
errno = ret_errno;
2520
ret = raise_privileges();
2521
if(ret != 0){
2522
errno = ret;
2497
2523
perror_plus("Failed to raise privileges");
2498
2524
} else {
2499
2525
struct stat st;
2563
2589
}
2564
2590
2565
2591
/* Lower privileges */
2566
ret_errno = lower_privileges();
2567
if(ret_errno != 0){
2568
errno = ret_errno;
2592
ret = lower_privileges();
2593
if(ret != 0){
2594
errno = ret;
2569
2595
perror_plus("Failed to lower privileges");
2570
2596
}
2571
2597
}
2899
2925
2900
2926
/* Allocate a new server */
2901
2927
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2902
&config, NULL, NULL, &ret_errno);
2928
&config, NULL, NULL, &ret);
2903
2929
2904
2930
/* Free the Avahi configuration data */
2905
2931
avahi_server_config_free(&config);
2908
2934
/* Check if creating the Avahi server object succeeded */
2909
2935
if(mc.server == NULL){
2910
2936
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2911
avahi_strerror(ret_errno));
2937
avahi_strerror(ret));
2912
2938
exitcode = EX_UNAVAILABLE;
2913
2939
goto end;
2914
2940
}
2949
2975
end:
2950
2976
2951
2977
if(debug){
2952
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2978
if(signal_received){
2979
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2980
argv[0], signal_received,
2981
strsignal(signal_received));
2982
} else {
2983
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2984
}
2953
2985
}
2954
2986
2955
2987
/* Cleanup things */
2966
2998
2967
2999
if(gnutls_initialized){
2968
3000
gnutls_certificate_free_credentials(mc.cred);
2969
gnutls_global_deinit();
2970
3001
gnutls_dh_params_deinit(mc.dh_params);
2971
3002
}
2972
3003
2995
3026
2996
3027
/* Re-raise privileges */
2997
3028
{
2998
ret_errno = raise_privileges();
2999
if(ret_errno != 0){
3000
errno = ret_errno;
3029
ret = raise_privileges();
3030
if(ret != 0){
3031
errno = ret;
3001
3032
perror_plus("Failed to raise privileges");
3002
3033
} else {
3003
3034
3008
3039
/* Take down the network interfaces which were brought up */
3009
3040
{
3010
3041
char *interface = NULL;
3011
while((interface=argz_next(interfaces_to_take_down,
3012
interfaces_to_take_down_size,
3013
interface))){
3014
ret_errno = take_down_interface(interface);
3015
if(ret_errno != 0){
3016
errno = ret_errno;
3042
while((interface = argz_next(interfaces_to_take_down,
3043
interfaces_to_take_down_size,
3044
interface))){
3045
ret = take_down_interface(interface);
3046
if(ret != 0){
3047
errno = ret;
3017
3048
perror_plus("Failed to take down interface");
3018
3049
}
3019
3050
}
3024
3055
}
3025
3056
}
3026
3057
3027
ret_errno = lower_privileges_permanently();
3028
if(ret_errno != 0){
3029
errno = ret_errno;
3058
ret = lower_privileges_permanently();
3059
if(ret != 0){
3060
errno = ret;
3030
3061
perror_plus("Failed to lower privileges permanently");
3031
3062
}
3032
3063
}
3034
3065
free(interfaces_to_take_down);
3035
3066
free(interfaces_hooks);
3036
3067
3068
void clean_dir_at(int base, const char * const dirname,
3069
uintmax_t level){
3070
struct dirent **direntries = NULL;
3071
int dret;
3072
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3073
O_RDONLY
3074
| O_NOFOLLOW
3075
| O_DIRECTORY
3076
| O_PATH));
3077
if(dir_fd == -1){
3078
perror_plus("open");
3079
return;
3080
}
3081
int numentries = scandirat(dir_fd, ".", &direntries,
3082
notdotentries, alphasort);
3083
if(numentries >= 0){
3084
for(int i = 0; i < numentries; i++){
3085
if(debug){
3086
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3087
dirname, direntries[i]->d_name);
3088
}
3089
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3090
if(dret == -1){
3091
if(errno == EISDIR){
3092
dret = unlinkat(dir_fd, direntries[i]->d_name,
3093
AT_REMOVEDIR);
3094
}
3095
if((dret == -1) and (errno == ENOTEMPTY)
3096
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3097
== 0) and (level == 0)){
3098
/* Recurse only in this special case */
3099
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3100
dret = 0;
3101
}
3102
if((dret == -1) and (errno != ENOENT)){
3103
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3104
direntries[i]->d_name, strerror(errno));
3105
}
3106
}
3107
free(direntries[i]);
3108
}
3109
3110
/* need to clean even if 0 because man page doesn't specify */
3111
free(direntries);
3112
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3113
if(dret == -1 and errno != ENOENT){
3114
perror_plus("rmdir");
3115
}
3116
} else {
3117
perror_plus("scandirat");
3118
}
3119
close(dir_fd);
3120
}
3121
3037
3122
/* Removes the GPGME temp directory and all files inside */
3038
3123
if(tempdir != NULL){
3039
struct dirent **direntries = NULL;
3040
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3041
| O_NOFOLLOW
3042
| O_DIRECTORY
3043
| O_PATH));
3044
if(tempdir_fd == -1){
3045
perror_plus("open");
3046
} else {
3047
int numentries = scandirat(tempdir_fd, ".", &direntries,
3048
notdotentries, alphasort);
3049
if(numentries >= 0){
3050
for(int i = 0; i < numentries; i++){
3051
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
3052
if(ret == -1){
3053
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
3054
" \"%s\", 0): %s\n", tempdir,
3055
direntries[i]->d_name, strerror(errno));
3056
}
3057
free(direntries[i]);
3058
}
3059
3060
/* need to clean even if 0 because man page doesn't specify */
3061
free(direntries);
3062
if(numentries == -1){
3063
perror_plus("scandir");
3064
}
3065
ret = rmdir(tempdir);
3066
if(ret == -1 and errno != ENOENT){
3067
perror_plus("rmdir");
3068
}
3069
}
3070
close(tempdir_fd);
3071
}
3124
clean_dir_at(-1, tempdir, 0);
3072
3125
}
3073
3126
3074
3127
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0