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- Committer: Teddy Hogeborn
- Date: 2018-02-22 18:34:39 UTC
- mfrom: (942 trunk)
- mto: This revision was merged to the branch mainline in revision 943.
- Revision ID: teddy@recompile.se-20180222183439-ardlmmsvs6jbkp8x
Merge from trunk
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2015 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
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(), strcpy() */
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;
1223
1226
sizeof(struct sockaddr_in));
1224
1227
}
1225
1228
if(ret < 0){
1226
if(errno == ENETUNREACH
1229
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1227
1230
and if_index != AVAHI_IF_UNSPEC
1228
1231
and connect_to == NULL
1229
1232
and not route_added and
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
strcpy(ifr->ifr_name, ifname);
1653
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1654
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1641
1655
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1642
1656
if(ret == -1){
1643
1657
if(debug){
1644
ret_errno = errno;
1658
old_errno = errno;
1645
1659
perror_plus("ioctl SIOCGIFFLAGS");
1646
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;
1647
1666
}
1648
1667
return false;
1649
1668
}
1669
if((close(s) == -1) and debug){
1670
old_errno = errno;
1671
perror_plus("close");
1672
errno = old_errno;
1673
}
1650
1674
return true;
1651
1675
}
1652
1676
1913
1937
return;
1914
1938
}
1915
1939
}
1916
#ifdef __GLIBC__
1917
#if __GLIBC_PREREQ(2, 15)
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
}
1918
1945
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1919
1946
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__ */
1928
1947
if(numhooks == -1){
1929
1948
perror_plus("scandir");
1949
close(devnull);
1930
1950
return;
1931
1951
}
1932
1952
struct dirent *direntry;
1933
1953
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
}
1939
1954
for(int i = 0; i < numhooks; i++){
1940
1955
direntry = direntries[i];
1941
1956
if(debug){
2085
2100
}
2086
2101
2087
2102
__attribute__((nonnull, warn_unused_result))
2088
error_t bring_up_interface(const char *const interface,
2089
const float delay){
2090
error_t old_errno = errno;
2103
int bring_up_interface(const char *const interface,
2104
const float delay){
2105
int old_errno = errno;
2091
2106
int ret;
2092
2107
struct ifreq network;
2093
2108
unsigned int if_index = if_nametoindex(interface);
2103
2118
}
2104
2119
2105
2120
if(not interface_is_up(interface)){
2106
error_t ret_errno = 0, ioctl_errno = 0;
2121
int ret_errno = 0;
2122
int ioctl_errno = 0;
2107
2123
if(not get_flags(interface, &network)){
2108
2124
ret_errno = errno;
2109
2125
fprintf_plus(stderr, "Failed to get flags for interface "
2196
2212
2197
2213
/* Sleep checking until interface is running.
2198
2214
Check every 0.25s, up to total time of delay */
2199
for(int i=0; i < delay * 4; i++){
2215
for(int i = 0; i < delay * 4; i++){
2200
2216
if(interface_is_running(interface)){
2201
2217
break;
2202
2218
}
2212
2228
}
2213
2229
2214
2230
__attribute__((nonnull, warn_unused_result))
2215
error_t take_down_interface(const char *const interface){
2216
error_t old_errno = errno;
2231
int take_down_interface(const char *const interface){
2232
int old_errno = errno;
2217
2233
struct ifreq network;
2218
2234
unsigned int if_index = if_nametoindex(interface);
2219
2235
if(if_index == 0){
2222
2238
return ENXIO;
2223
2239
}
2224
2240
if(interface_is_up(interface)){
2225
error_t ret_errno = 0, ioctl_errno = 0;
2241
int ret_errno = 0;
2242
int ioctl_errno = 0;
2226
2243
if(not get_flags(interface, &network) and debug){
2227
2244
ret_errno = errno;
2228
2245
fprintf_plus(stderr, "Failed to get flags for interface "
2478
2495
.args_doc = "",
2479
2496
.doc = "Mandos client -- Get and decrypt"
2480
2497
" passwords from a Mandos server" };
2481
ret = argp_parse(&argp, argc, argv,
2482
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2483
switch(ret){
2498
ret_errno = argp_parse(&argp, argc, argv,
2499
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2500
switch(ret_errno){
2484
2501
case 0:
2485
2502
break;
2486
2503
case ENOMEM:
2487
2504
default:
2488
errno = ret;
2505
errno = ret_errno;
2489
2506
perror_plus("argp_parse");
2490
2507
exitcode = EX_OSERR;
2491
2508
goto end;
2497
2514
2498
2515
{
2499
2516
/* Work around Debian bug #633582:
2500
<http://bugs.debian.org/633582> */
2517
<https://bugs.debian.org/633582> */
2501
2518
2502
2519
/* Re-raise privileges */
2503
ret_errno = raise_privileges();
2504
if(ret_errno != 0){
2505
errno = ret_errno;
2520
ret = raise_privileges();
2521
if(ret != 0){
2522
errno = ret;
2506
2523
perror_plus("Failed to raise privileges");
2507
2524
} else {
2508
2525
struct stat st;
2572
2589
}
2573
2590
2574
2591
/* Lower privileges */
2575
ret_errno = lower_privileges();
2576
if(ret_errno != 0){
2577
errno = ret_errno;
2592
ret = lower_privileges();
2593
if(ret != 0){
2594
errno = ret;
2578
2595
perror_plus("Failed to lower privileges");
2579
2596
}
2580
2597
}
2908
2925
2909
2926
/* Allocate a new server */
2910
2927
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2911
&config, NULL, NULL, &ret_errno);
2928
&config, NULL, NULL, &ret);
2912
2929
2913
2930
/* Free the Avahi configuration data */
2914
2931
avahi_server_config_free(&config);
2917
2934
/* Check if creating the Avahi server object succeeded */
2918
2935
if(mc.server == NULL){
2919
2936
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2920
avahi_strerror(ret_errno));
2937
avahi_strerror(ret));
2921
2938
exitcode = EX_UNAVAILABLE;
2922
2939
goto end;
2923
2940
}
2958
2975
end:
2959
2976
2960
2977
if(debug){
2961
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
}
2962
2985
}
2963
2986
2964
2987
/* Cleanup things */
2975
2998
2976
2999
if(gnutls_initialized){
2977
3000
gnutls_certificate_free_credentials(mc.cred);
2978
gnutls_global_deinit();
2979
3001
gnutls_dh_params_deinit(mc.dh_params);
2980
3002
}
2981
3003
3004
3026
3005
3027
/* Re-raise privileges */
3006
3028
{
3007
ret_errno = raise_privileges();
3008
if(ret_errno != 0){
3009
errno = ret_errno;
3029
ret = raise_privileges();
3030
if(ret != 0){
3031
errno = ret;
3010
3032
perror_plus("Failed to raise privileges");
3011
3033
} else {
3012
3034
3017
3039
/* Take down the network interfaces which were brought up */
3018
3040
{
3019
3041
char *interface = NULL;
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;
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;
3026
3048
perror_plus("Failed to take down interface");
3027
3049
}
3028
3050
}
3033
3055
}
3034
3056
}
3035
3057
3036
ret_errno = lower_privileges_permanently();
3037
if(ret_errno != 0){
3038
errno = ret_errno;
3058
ret = lower_privileges_permanently();
3059
if(ret != 0){
3060
errno = ret;
3039
3061
perror_plus("Failed to lower privileges permanently");
3040
3062
}
3041
3063
}
3043
3065
free(interfaces_to_take_down);
3044
3066
free(interfaces_hooks);
3045
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
3046
3122
/* Removes the GPGME temp directory and all files inside */
3047
3123
if(tempdir != NULL){
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
}
3124
clean_dir_at(-1, tempdir, 0);
3091
3125
}
3092
3126
3093
3127
if(quit_now){
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Version: 2.0.2.dev0