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- Committer: Teddy Hogeborn
- Date: 2015-10-04 13:44:03 UTC
- mto: (237.7.594 trunk)
- mto: This revision was merged to the branch mainline in revision 327.
- 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,
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
ret = close(dhpfile);
617
if(ret == -1){
618
perror_plus("close");
619
}
620
618
if(params.data == NULL){
621
619
dhparamsfilename = NULL;
622
620
}
631
629
safer_gnutls_strerror(ret));
632
630
dhparamsfilename = NULL;
633
631
}
634
free(params.data);
635
632
} while(false);
636
633
}
637
634
if(dhparamsfilename == NULL){
758
755
globalfail:
759
756
760
757
gnutls_certificate_free_credentials(mc->cred);
758
gnutls_global_deinit();
761
759
gnutls_dh_params_deinit(mc->dh_params);
762
760
return -1;
763
761
}
824
822
825
823
/* Set effective uid to 0, return errno */
826
824
__attribute__((warn_unused_result))
827
int raise_privileges(void){
828
int old_errno = errno;
829
int ret = 0;
825
error_t raise_privileges(void){
826
error_t old_errno = errno;
827
error_t ret_errno = 0;
830
828
if(seteuid(0) == -1){
831
ret = errno;
829
ret_errno = errno;
832
830
}
833
831
errno = old_errno;
834
return ret;
832
return ret_errno;
835
833
}
836
834
837
835
/* Set effective and real user ID to 0. Return errno. */
838
836
__attribute__((warn_unused_result))
839
int raise_privileges_permanently(void){
840
int old_errno = errno;
841
int ret = raise_privileges();
842
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){
843
841
errno = old_errno;
844
return ret;
842
return ret_errno;
845
843
}
846
844
if(setuid(0) == -1){
847
ret = errno;
845
ret_errno = errno;
848
846
}
849
847
errno = old_errno;
850
return ret;
848
return ret_errno;
851
849
}
852
850
853
851
/* Set effective user ID to unprivileged saved user ID */
854
852
__attribute__((warn_unused_result))
855
int lower_privileges(void){
856
int old_errno = errno;
857
int ret = 0;
853
error_t lower_privileges(void){
854
error_t old_errno = errno;
855
error_t ret_errno = 0;
858
856
if(seteuid(uid) == -1){
859
ret = errno;
857
ret_errno = errno;
860
858
}
861
859
errno = old_errno;
862
return ret;
860
return ret_errno;
863
861
}
864
862
865
863
/* Lower privileges permanently */
866
864
__attribute__((warn_unused_result))
867
int lower_privileges_permanently(void){
868
int old_errno = errno;
869
int ret = 0;
865
error_t lower_privileges_permanently(void){
866
error_t old_errno = errno;
867
error_t ret_errno = 0;
870
868
if(setuid(uid) == -1){
871
ret = errno;
869
ret_errno = errno;
872
870
}
873
871
errno = old_errno;
874
return ret;
872
return ret_errno;
875
873
}
876
874
877
875
/* Helper function to add_local_route() and delete_local_route() */
1084
1082
bool match = false;
1085
1083
{
1086
1084
char *interface = NULL;
1087
while((interface = argz_next(mc->interfaces,
1088
mc->interfaces_size,
1089
interface))){
1085
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1086
interface))){
1090
1087
if(if_nametoindex(interface) == (unsigned int)if_index){
1091
1088
match = true;
1092
1089
break;
1226
1223
sizeof(struct sockaddr_in));
1227
1224
}
1228
1225
if(ret < 0){
1229
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1226
if(errno == ENETUNREACH
1230
1227
and if_index != AVAHI_IF_UNSPEC
1231
1228
and connect_to == NULL
1232
1229
and not route_added and
1245
1242
with an explicit route added with the server's address.
1246
1243
1247
1244
Avahi bug reference:
1248
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1245
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1249
1246
https://bugs.debian.org/587961
1250
1247
*/
1251
1248
if(debug){
1431
1428
&decrypted_buffer, mc);
1432
1429
if(decrypted_buffer_size >= 0){
1433
1430
1434
clearerr(stdout);
1435
1431
written = 0;
1436
1432
while(written < (size_t) decrypted_buffer_size){
1437
1433
if(quit_now){
1453
1449
}
1454
1450
written += (size_t)ret;
1455
1451
}
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
}
1466
1452
retval = 0;
1467
1453
}
1468
1454
}
1499
1485
return retval;
1500
1486
}
1501
1487
1488
__attribute__((nonnull))
1502
1489
static void resolve_callback(AvahiSServiceResolver *r,
1503
1490
AvahiIfIndex interface,
1504
1491
AvahiProtocol proto,
1641
1628
__attribute__((nonnull, warn_unused_result))
1642
1629
bool get_flags(const char *ifname, struct ifreq *ifr){
1643
1630
int ret;
1644
int old_errno;
1631
error_t ret_errno;
1645
1632
1646
1633
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1647
1634
if(s < 0){
1648
old_errno = errno;
1635
ret_errno = errno;
1649
1636
perror_plus("socket");
1650
errno = old_errno;
1637
errno = ret_errno;
1651
1638
return false;
1652
1639
}
1653
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1654
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1640
strcpy(ifr->ifr_name, ifname);
1655
1641
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1656
1642
if(ret == -1){
1657
1643
if(debug){
1658
old_errno = errno;
1644
ret_errno = errno;
1659
1645
perror_plus("ioctl SIOCGIFFLAGS");
1660
errno = old_errno;
1661
}
1662
if((close(s) == -1) and debug){
1663
old_errno = errno;
1664
perror_plus("close");
1665
errno = old_errno;
1646
errno = ret_errno;
1666
1647
}
1667
1648
return false;
1668
1649
}
1669
if((close(s) == -1) and debug){
1670
old_errno = errno;
1671
perror_plus("close");
1672
errno = old_errno;
1673
}
1674
1650
return true;
1675
1651
}
1676
1652
1937
1913
return;
1938
1914
}
1939
1915
}
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
}
1916
#ifdef __GLIBC__
1917
#if __GLIBC_PREREQ(2, 15)
1945
1918
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1946
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__ */
1947
1928
if(numhooks == -1){
1948
1929
perror_plus("scandir");
1949
close(devnull);
1950
1930
return;
1951
1931
}
1952
1932
struct dirent *direntry;
1953
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
}
1954
1939
for(int i = 0; i < numhooks; i++){
1955
1940
direntry = direntries[i];
1956
1941
if(debug){
2100
2085
}
2101
2086
2102
2087
__attribute__((nonnull, warn_unused_result))
2103
int bring_up_interface(const char *const interface,
2104
const float delay){
2105
int old_errno = errno;
2088
error_t bring_up_interface(const char *const interface,
2089
const float delay){
2090
error_t old_errno = errno;
2106
2091
int ret;
2107
2092
struct ifreq network;
2108
2093
unsigned int if_index = if_nametoindex(interface);
2118
2103
}
2119
2104
2120
2105
if(not interface_is_up(interface)){
2121
int ret_errno = 0;
2122
int ioctl_errno = 0;
2106
error_t ret_errno = 0, ioctl_errno = 0;
2123
2107
if(not get_flags(interface, &network)){
2124
2108
ret_errno = errno;
2125
2109
fprintf_plus(stderr, "Failed to get flags for interface "
2212
2196
2213
2197
/* Sleep checking until interface is running.
2214
2198
Check every 0.25s, up to total time of delay */
2215
for(int i = 0; i < delay * 4; i++){
2199
for(int i=0; i < delay * 4; i++){
2216
2200
if(interface_is_running(interface)){
2217
2201
break;
2218
2202
}
2228
2212
}
2229
2213
2230
2214
__attribute__((nonnull, warn_unused_result))
2231
int take_down_interface(const char *const interface){
2232
int old_errno = errno;
2215
error_t take_down_interface(const char *const interface){
2216
error_t old_errno = errno;
2233
2217
struct ifreq network;
2234
2218
unsigned int if_index = if_nametoindex(interface);
2235
2219
if(if_index == 0){
2238
2222
return ENXIO;
2239
2223
}
2240
2224
if(interface_is_up(interface)){
2241
int ret_errno = 0;
2242
int ioctl_errno = 0;
2225
error_t ret_errno = 0, ioctl_errno = 0;
2243
2226
if(not get_flags(interface, &network) and debug){
2244
2227
ret_errno = errno;
2245
2228
fprintf_plus(stderr, "Failed to get flags for interface "
2495
2478
.args_doc = "",
2496
2479
.doc = "Mandos client -- Get and decrypt"
2497
2480
" passwords from a Mandos server" };
2498
ret_errno = argp_parse(&argp, argc, argv,
2499
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2500
switch(ret_errno){
2481
ret = argp_parse(&argp, argc, argv,
2482
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2483
switch(ret){
2501
2484
case 0:
2502
2485
break;
2503
2486
case ENOMEM:
2504
2487
default:
2505
errno = ret_errno;
2488
errno = ret;
2506
2489
perror_plus("argp_parse");
2507
2490
exitcode = EX_OSERR;
2508
2491
goto end;
2514
2497
2515
2498
{
2516
2499
/* Work around Debian bug #633582:
2517
<https://bugs.debian.org/633582> */
2500
<http://bugs.debian.org/633582> */
2518
2501
2519
2502
/* Re-raise privileges */
2520
ret = raise_privileges();
2521
if(ret != 0){
2522
errno = ret;
2503
ret_errno = raise_privileges();
2504
if(ret_errno != 0){
2505
errno = ret_errno;
2523
2506
perror_plus("Failed to raise privileges");
2524
2507
} else {
2525
2508
struct stat st;
2589
2572
}
2590
2573
2591
2574
/* Lower privileges */
2592
ret = lower_privileges();
2593
if(ret != 0){
2594
errno = ret;
2575
ret_errno = lower_privileges();
2576
if(ret_errno != 0){
2577
errno = ret_errno;
2595
2578
perror_plus("Failed to lower privileges");
2596
2579
}
2597
2580
}
2925
2908
2926
2909
/* Allocate a new server */
2927
2910
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2928
&config, NULL, NULL, &ret);
2911
&config, NULL, NULL, &ret_errno);
2929
2912
2930
2913
/* Free the Avahi configuration data */
2931
2914
avahi_server_config_free(&config);
2934
2917
/* Check if creating the Avahi server object succeeded */
2935
2918
if(mc.server == NULL){
2936
2919
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2937
avahi_strerror(ret));
2920
avahi_strerror(ret_errno));
2938
2921
exitcode = EX_UNAVAILABLE;
2939
2922
goto end;
2940
2923
}
2975
2958
end:
2976
2959
2977
2960
if(debug){
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
}
2961
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2985
2962
}
2986
2963
2987
2964
/* Cleanup things */
2998
2975
2999
2976
if(gnutls_initialized){
3000
2977
gnutls_certificate_free_credentials(mc.cred);
2978
gnutls_global_deinit();
3001
2979
gnutls_dh_params_deinit(mc.dh_params);
3002
2980
}
3003
2981
3026
3004
3027
3005
/* Re-raise privileges */
3028
3006
{
3029
ret = raise_privileges();
3030
if(ret != 0){
3031
errno = ret;
3007
ret_errno = raise_privileges();
3008
if(ret_errno != 0){
3009
errno = ret_errno;
3032
3010
perror_plus("Failed to raise privileges");
3033
3011
} else {
3034
3012
3039
3017
/* Take down the network interfaces which were brought up */
3040
3018
{
3041
3019
char *interface = NULL;
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;
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;
3048
3026
perror_plus("Failed to take down interface");
3049
3027
}
3050
3028
}
3055
3033
}
3056
3034
}
3057
3035
3058
ret = lower_privileges_permanently();
3059
if(ret != 0){
3060
errno = ret;
3036
ret_errno = lower_privileges_permanently();
3037
if(ret_errno != 0){
3038
errno = ret_errno;
3061
3039
perror_plus("Failed to lower privileges permanently");
3062
3040
}
3063
3041
}
3065
3043
free(interfaces_to_take_down);
3066
3044
free(interfaces_hooks);
3067
3045
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
3122
3046
/* Removes the GPGME temp directory and all files inside */
3123
3047
if(tempdir != NULL){
3124
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
}
3125
3091
}
3126
3092
3127
3093
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0