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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
613
615
}
614
616
params.size += (unsigned int)bytes_read;
615
617
}
616
close(dhpfile);
617
618
if(params.data == NULL){
618
619
dhparamsfilename = NULL;
619
620
}
628
629
safer_gnutls_strerror(ret));
629
630
dhparamsfilename = NULL;
630
631
}
631
free(params.data);
632
632
} while(false);
633
633
}
634
634
if(dhparamsfilename == NULL){
755
755
globalfail:
756
756
757
757
gnutls_certificate_free_credentials(mc->cred);
758
gnutls_global_deinit();
758
759
gnutls_dh_params_deinit(mc->dh_params);
759
760
return -1;
760
761
}
821
822
822
823
/* Set effective uid to 0, return errno */
823
824
__attribute__((warn_unused_result))
824
int raise_privileges(void){
825
int old_errno = errno;
826
int ret = 0;
825
error_t raise_privileges(void){
826
error_t old_errno = errno;
827
error_t ret_errno = 0;
827
828
if(seteuid(0) == -1){
828
ret = errno;
829
ret_errno = errno;
829
830
}
830
831
errno = old_errno;
831
return ret;
832
return ret_errno;
832
833
}
833
834
834
835
/* Set effective and real user ID to 0. Return errno. */
835
836
__attribute__((warn_unused_result))
836
int raise_privileges_permanently(void){
837
int old_errno = errno;
838
int ret = raise_privileges();
839
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){
840
841
errno = old_errno;
841
return ret;
842
return ret_errno;
842
843
}
843
844
if(setuid(0) == -1){
844
ret = errno;
845
ret_errno = errno;
845
846
}
846
847
errno = old_errno;
847
return ret;
848
return ret_errno;
848
849
}
849
850
850
851
/* Set effective user ID to unprivileged saved user ID */
851
852
__attribute__((warn_unused_result))
852
int lower_privileges(void){
853
int old_errno = errno;
854
int ret = 0;
853
error_t lower_privileges(void){
854
error_t old_errno = errno;
855
error_t ret_errno = 0;
855
856
if(seteuid(uid) == -1){
856
ret = errno;
857
ret_errno = errno;
857
858
}
858
859
errno = old_errno;
859
return ret;
860
return ret_errno;
860
861
}
861
862
862
863
/* Lower privileges permanently */
863
864
__attribute__((warn_unused_result))
864
int lower_privileges_permanently(void){
865
int old_errno = errno;
866
int ret = 0;
865
error_t lower_privileges_permanently(void){
866
error_t old_errno = errno;
867
error_t ret_errno = 0;
867
868
if(setuid(uid) == -1){
868
ret = errno;
869
ret_errno = errno;
869
870
}
870
871
errno = old_errno;
871
return ret;
872
return ret_errno;
872
873
}
873
874
874
875
/* Helper function to add_local_route() and delete_local_route() */
1081
1082
bool match = false;
1082
1083
{
1083
1084
char *interface = NULL;
1084
while((interface = argz_next(mc->interfaces,
1085
mc->interfaces_size,
1086
interface))){
1085
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1086
interface))){
1087
1087
if(if_nametoindex(interface) == (unsigned int)if_index){
1088
1088
match = true;
1089
1089
break;
1242
1242
with an explicit route added with the server's address.
1243
1243
1244
1244
Avahi bug reference:
1245
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1245
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1246
1246
https://bugs.debian.org/587961
1247
1247
*/
1248
1248
if(debug){
1428
1428
&decrypted_buffer, mc);
1429
1429
if(decrypted_buffer_size >= 0){
1430
1430
1431
clearerr(stdout);
1432
1431
written = 0;
1433
1432
while(written < (size_t) decrypted_buffer_size){
1434
1433
if(quit_now){
1450
1449
}
1451
1450
written += (size_t)ret;
1452
1451
}
1453
ret = fflush(stdout);
1454
if(ret != 0){
1455
int e = errno;
1456
if(debug){
1457
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1458
strerror(errno));
1459
}
1460
errno = e;
1461
goto mandos_end;
1462
}
1463
1452
retval = 0;
1464
1453
}
1465
1454
}
1496
1485
return retval;
1497
1486
}
1498
1487
1488
__attribute__((nonnull))
1499
1489
static void resolve_callback(AvahiSServiceResolver *r,
1500
1490
AvahiIfIndex interface,
1501
1491
AvahiProtocol proto,
1638
1628
__attribute__((nonnull, warn_unused_result))
1639
1629
bool get_flags(const char *ifname, struct ifreq *ifr){
1640
1630
int ret;
1641
int old_errno;
1631
error_t ret_errno;
1642
1632
1643
1633
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1644
1634
if(s < 0){
1645
old_errno = errno;
1635
ret_errno = errno;
1646
1636
perror_plus("socket");
1647
errno = old_errno;
1637
errno = ret_errno;
1648
1638
return false;
1649
1639
}
1650
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1651
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1640
strcpy(ifr->ifr_name, ifname);
1652
1641
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1653
1642
if(ret == -1){
1654
1643
if(debug){
1655
old_errno = errno;
1644
ret_errno = errno;
1656
1645
perror_plus("ioctl SIOCGIFFLAGS");
1657
errno = old_errno;
1646
errno = ret_errno;
1658
1647
}
1659
close(s);
1660
1648
return false;
1661
1649
}
1662
close(s);
1663
1650
return true;
1664
1651
}
1665
1652
1926
1913
return;
1927
1914
}
1928
1915
}
1929
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1930
if(devnull == -1){
1931
perror_plus("open(\"/dev/null\", O_RDONLY)");
1932
return;
1933
}
1916
#ifdef __GLIBC__
1917
#if __GLIBC_PREREQ(2, 15)
1934
1918
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1935
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__ */
1936
1928
if(numhooks == -1){
1937
1929
perror_plus("scandir");
1938
close(devnull);
1939
1930
return;
1940
1931
}
1941
1932
struct dirent *direntry;
1942
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
}
1943
1939
for(int i = 0; i < numhooks; i++){
1944
1940
direntry = direntries[i];
1945
1941
if(debug){
2089
2085
}
2090
2086
2091
2087
__attribute__((nonnull, warn_unused_result))
2092
int bring_up_interface(const char *const interface,
2093
const float delay){
2094
int old_errno = errno;
2088
error_t bring_up_interface(const char *const interface,
2089
const float delay){
2090
error_t old_errno = errno;
2095
2091
int ret;
2096
2092
struct ifreq network;
2097
2093
unsigned int if_index = if_nametoindex(interface);
2107
2103
}
2108
2104
2109
2105
if(not interface_is_up(interface)){
2110
int ret_errno = 0;
2111
int ioctl_errno = 0;
2106
error_t ret_errno = 0, ioctl_errno = 0;
2112
2107
if(not get_flags(interface, &network)){
2113
2108
ret_errno = errno;
2114
2109
fprintf_plus(stderr, "Failed to get flags for interface "
2201
2196
2202
2197
/* Sleep checking until interface is running.
2203
2198
Check every 0.25s, up to total time of delay */
2204
for(int i = 0; i < delay * 4; i++){
2199
for(int i=0; i < delay * 4; i++){
2205
2200
if(interface_is_running(interface)){
2206
2201
break;
2207
2202
}
2217
2212
}
2218
2213
2219
2214
__attribute__((nonnull, warn_unused_result))
2220
int take_down_interface(const char *const interface){
2221
int old_errno = errno;
2215
error_t take_down_interface(const char *const interface){
2216
error_t old_errno = errno;
2222
2217
struct ifreq network;
2223
2218
unsigned int if_index = if_nametoindex(interface);
2224
2219
if(if_index == 0){
2227
2222
return ENXIO;
2228
2223
}
2229
2224
if(interface_is_up(interface)){
2230
int ret_errno = 0;
2231
int ioctl_errno = 0;
2225
error_t ret_errno = 0, ioctl_errno = 0;
2232
2226
if(not get_flags(interface, &network) and debug){
2233
2227
ret_errno = errno;
2234
2228
fprintf_plus(stderr, "Failed to get flags for interface "
2484
2478
.args_doc = "",
2485
2479
.doc = "Mandos client -- Get and decrypt"
2486
2480
" passwords from a Mandos server" };
2487
ret_errno = argp_parse(&argp, argc, argv,
2488
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2489
switch(ret_errno){
2481
ret = argp_parse(&argp, argc, argv,
2482
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2483
switch(ret){
2490
2484
case 0:
2491
2485
break;
2492
2486
case ENOMEM:
2493
2487
default:
2494
errno = ret_errno;
2488
errno = ret;
2495
2489
perror_plus("argp_parse");
2496
2490
exitcode = EX_OSERR;
2497
2491
goto end;
2503
2497
2504
2498
{
2505
2499
/* Work around Debian bug #633582:
2506
<https://bugs.debian.org/633582> */
2500
<http://bugs.debian.org/633582> */
2507
2501
2508
2502
/* Re-raise privileges */
2509
ret = raise_privileges();
2510
if(ret != 0){
2511
errno = ret;
2503
ret_errno = raise_privileges();
2504
if(ret_errno != 0){
2505
errno = ret_errno;
2512
2506
perror_plus("Failed to raise privileges");
2513
2507
} else {
2514
2508
struct stat st;
2578
2572
}
2579
2573
2580
2574
/* Lower privileges */
2581
ret = lower_privileges();
2582
if(ret != 0){
2583
errno = ret;
2575
ret_errno = lower_privileges();
2576
if(ret_errno != 0){
2577
errno = ret_errno;
2584
2578
perror_plus("Failed to lower privileges");
2585
2579
}
2586
2580
}
2914
2908
2915
2909
/* Allocate a new server */
2916
2910
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2917
&config, NULL, NULL, &ret);
2911
&config, NULL, NULL, &ret_errno);
2918
2912
2919
2913
/* Free the Avahi configuration data */
2920
2914
avahi_server_config_free(&config);
2923
2917
/* Check if creating the Avahi server object succeeded */
2924
2918
if(mc.server == NULL){
2925
2919
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2926
avahi_strerror(ret));
2920
avahi_strerror(ret_errno));
2927
2921
exitcode = EX_UNAVAILABLE;
2928
2922
goto end;
2929
2923
}
2964
2958
end:
2965
2959
2966
2960
if(debug){
2967
if(signal_received){
2968
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2969
argv[0], signal_received,
2970
strsignal(signal_received));
2971
} else {
2972
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2973
}
2961
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2974
2962
}
2975
2963
2976
2964
/* Cleanup things */
2987
2975
2988
2976
if(gnutls_initialized){
2989
2977
gnutls_certificate_free_credentials(mc.cred);
2978
gnutls_global_deinit();
2990
2979
gnutls_dh_params_deinit(mc.dh_params);
2991
2980
}
2992
2981
3015
3004
3016
3005
/* Re-raise privileges */
3017
3006
{
3018
ret = raise_privileges();
3019
if(ret != 0){
3020
errno = ret;
3007
ret_errno = raise_privileges();
3008
if(ret_errno != 0){
3009
errno = ret_errno;
3021
3010
perror_plus("Failed to raise privileges");
3022
3011
} else {
3023
3012
3028
3017
/* Take down the network interfaces which were brought up */
3029
3018
{
3030
3019
char *interface = NULL;
3031
while((interface = argz_next(interfaces_to_take_down,
3032
interfaces_to_take_down_size,
3033
interface))){
3034
ret = take_down_interface(interface);
3035
if(ret != 0){
3036
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;
3037
3026
perror_plus("Failed to take down interface");
3038
3027
}
3039
3028
}
3044
3033
}
3045
3034
}
3046
3035
3047
ret = lower_privileges_permanently();
3048
if(ret != 0){
3049
errno = ret;
3036
ret_errno = lower_privileges_permanently();
3037
if(ret_errno != 0){
3038
errno = ret_errno;
3050
3039
perror_plus("Failed to lower privileges permanently");
3051
3040
}
3052
3041
}
3054
3043
free(interfaces_to_take_down);
3055
3044
free(interfaces_hooks);
3056
3045
3057
void clean_dir_at(int base, const char * const dirname,
3058
uintmax_t level){
3059
struct dirent **direntries = NULL;
3060
int dret;
3061
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3062
O_RDONLY
3063
| O_NOFOLLOW
3064
| O_DIRECTORY
3065
| O_PATH));
3066
if(dir_fd == -1){
3067
perror_plus("open");
3068
return;
3069
}
3070
int numentries = scandirat(dir_fd, ".", &direntries,
3071
notdotentries, alphasort);
3072
if(numentries >= 0){
3073
for(int i = 0; i < numentries; i++){
3074
if(debug){
3075
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3076
dirname, direntries[i]->d_name);
3077
}
3078
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3079
if(dret == -1){
3080
if(errno == EISDIR){
3081
dret = unlinkat(dir_fd, direntries[i]->d_name,
3082
AT_REMOVEDIR);
3083
}
3084
if((dret == -1) and (errno == ENOTEMPTY)
3085
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3086
== 0) and (level == 0)){
3087
/* Recurse only in this special case */
3088
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3089
dret = 0;
3090
}
3091
if((dret == -1) and (errno != ENOENT)){
3092
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3093
direntries[i]->d_name, strerror(errno));
3094
}
3095
}
3096
free(direntries[i]);
3097
}
3098
3099
/* need to clean even if 0 because man page doesn't specify */
3100
free(direntries);
3101
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3102
if(dret == -1 and errno != ENOENT){
3103
perror_plus("rmdir");
3104
}
3105
} else {
3106
perror_plus("scandirat");
3107
}
3108
close(dir_fd);
3109
}
3110
3111
3046
/* Removes the GPGME temp directory and all files inside */
3112
3047
if(tempdir != NULL){
3113
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
}
3114
3091
}
3115
3092
3116
3093
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0