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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 © 2008-2016 Teddy Hogeborn
13
* Copyright © 2008-2016 Björn Påhlsson
12
* Copyright © 2008-2015 Teddy Hogeborn
13
* Copyright © 2008-2015 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
47
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strncpy(), strsignal()
51
*/
50
asprintf(), strcpy() */
52
51
#include <sys/ioctl.h> /* ioctl */
53
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
54
53
sockaddr_in6, PF_INET6,
58
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
59
58
inet_pton(), connect(),
60
59
getnameinfo() */
61
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
#include <fcntl.h> /* open(), unlinkat() */
62
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
63
62
*/
64
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
65
64
strtoimax() */
66
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
67
EAI_SYSTEM, ENETUNREACH,
68
EHOSTUNREACH, ECONNREFUSED, EPROTO,
69
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
70
ENOTEMPTY,
65
#include <errno.h> /* perror(), errno,
71
66
program_invocation_short_name */
72
67
#include <time.h> /* nanosleep(), time(), sleep() */
73
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
518
513
fprintf_plus(stderr, "GnuTLS: %s", string);
519
514
}
520
515
521
__attribute__((nonnull(1, 2, 4), warn_unused_result))
516
__attribute__((nonnull, warn_unused_result))
522
517
static int init_gnutls_global(const char *pubkeyfilename,
523
518
const char *seckeyfilename,
524
519
const char *dhparamsfilename,
530
525
fprintf_plus(stderr, "Initializing GnuTLS\n");
531
526
}
532
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
533
535
if(debug){
534
536
/* "Use a log level over 10 to enable all debugging options."
535
537
* - GnuTLS manual
543
545
if(ret != GNUTLS_E_SUCCESS){
544
546
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
545
547
safer_gnutls_strerror(ret));
548
gnutls_global_deinit();
546
549
return -1;
547
550
}
548
551
626
629
safer_gnutls_strerror(ret));
627
630
dhparamsfilename = NULL;
628
631
}
629
free(params.data);
630
632
} while(false);
631
633
}
632
634
if(dhparamsfilename == NULL){
753
755
globalfail:
754
756
755
757
gnutls_certificate_free_credentials(mc->cred);
758
gnutls_global_deinit();
756
759
gnutls_dh_params_deinit(mc->dh_params);
757
760
return -1;
758
761
}
819
822
820
823
/* Set effective uid to 0, return errno */
821
824
__attribute__((warn_unused_result))
822
int raise_privileges(void){
823
int old_errno = errno;
824
int ret = 0;
825
error_t raise_privileges(void){
826
error_t old_errno = errno;
827
error_t ret_errno = 0;
825
828
if(seteuid(0) == -1){
826
ret = errno;
829
ret_errno = errno;
827
830
}
828
831
errno = old_errno;
829
return ret;
832
return ret_errno;
830
833
}
831
834
832
835
/* Set effective and real user ID to 0. Return errno. */
833
836
__attribute__((warn_unused_result))
834
int raise_privileges_permanently(void){
835
int old_errno = errno;
836
int ret = raise_privileges();
837
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){
838
841
errno = old_errno;
839
return ret;
842
return ret_errno;
840
843
}
841
844
if(setuid(0) == -1){
842
ret = errno;
845
ret_errno = errno;
843
846
}
844
847
errno = old_errno;
845
return ret;
848
return ret_errno;
846
849
}
847
850
848
851
/* Set effective user ID to unprivileged saved user ID */
849
852
__attribute__((warn_unused_result))
850
int lower_privileges(void){
851
int old_errno = errno;
852
int ret = 0;
853
error_t lower_privileges(void){
854
error_t old_errno = errno;
855
error_t ret_errno = 0;
853
856
if(seteuid(uid) == -1){
854
ret = errno;
857
ret_errno = errno;
855
858
}
856
859
errno = old_errno;
857
return ret;
860
return ret_errno;
858
861
}
859
862
860
863
/* Lower privileges permanently */
861
864
__attribute__((warn_unused_result))
862
int lower_privileges_permanently(void){
863
int old_errno = errno;
864
int ret = 0;
865
error_t lower_privileges_permanently(void){
866
error_t old_errno = errno;
867
error_t ret_errno = 0;
865
868
if(setuid(uid) == -1){
866
ret = errno;
869
ret_errno = errno;
867
870
}
868
871
errno = old_errno;
869
return ret;
872
return ret_errno;
870
873
}
871
874
872
875
/* Helper function to add_local_route() and delete_local_route() */
1079
1082
bool match = false;
1080
1083
{
1081
1084
char *interface = NULL;
1082
while((interface = argz_next(mc->interfaces,
1083
mc->interfaces_size,
1084
interface))){
1085
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1086
interface))){
1085
1087
if(if_nametoindex(interface) == (unsigned int)if_index){
1086
1088
match = true;
1087
1089
break;
1221
1223
sizeof(struct sockaddr_in));
1222
1224
}
1223
1225
if(ret < 0){
1224
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1226
if(errno == ENETUNREACH
1225
1227
and if_index != AVAHI_IF_UNSPEC
1226
1228
and connect_to == NULL
1227
1229
and not route_added and
1240
1242
with an explicit route added with the server's address.
1241
1243
1242
1244
Avahi bug reference:
1243
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1245
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1244
1246
https://bugs.debian.org/587961
1245
1247
*/
1246
1248
if(debug){
1426
1428
&decrypted_buffer, mc);
1427
1429
if(decrypted_buffer_size >= 0){
1428
1430
1429
clearerr(stdout);
1430
1431
written = 0;
1431
1432
while(written < (size_t) decrypted_buffer_size){
1432
1433
if(quit_now){
1448
1449
}
1449
1450
written += (size_t)ret;
1450
1451
}
1451
ret = fflush(stdout);
1452
if(ret != 0){
1453
int e = errno;
1454
if(debug){
1455
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1456
strerror(errno));
1457
}
1458
errno = e;
1459
goto mandos_end;
1460
}
1461
1452
retval = 0;
1462
1453
}
1463
1454
}
1637
1628
__attribute__((nonnull, warn_unused_result))
1638
1629
bool get_flags(const char *ifname, struct ifreq *ifr){
1639
1630
int ret;
1640
int old_errno;
1631
error_t ret_errno;
1641
1632
1642
1633
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1643
1634
if(s < 0){
1644
old_errno = errno;
1635
ret_errno = errno;
1645
1636
perror_plus("socket");
1646
errno = old_errno;
1637
errno = ret_errno;
1647
1638
return false;
1648
1639
}
1649
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1650
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1640
strcpy(ifr->ifr_name, ifname);
1651
1641
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1652
1642
if(ret == -1){
1653
1643
if(debug){
1654
old_errno = errno;
1644
ret_errno = errno;
1655
1645
perror_plus("ioctl SIOCGIFFLAGS");
1656
errno = old_errno;
1646
errno = ret_errno;
1657
1647
}
1658
1648
return false;
1659
1649
}
1923
1913
return;
1924
1914
}
1925
1915
}
1916
#ifdef __GLIBC__
1917
#if __GLIBC_PREREQ(2, 15)
1926
1918
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1927
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__ */
1928
1928
if(numhooks == -1){
1929
1929
perror_plus("scandir");
1930
1930
return;
2085
2085
}
2086
2086
2087
2087
__attribute__((nonnull, warn_unused_result))
2088
int bring_up_interface(const char *const interface,
2089
const float delay){
2090
int old_errno = errno;
2088
error_t bring_up_interface(const char *const interface,
2089
const float delay){
2090
error_t old_errno = errno;
2091
2091
int ret;
2092
2092
struct ifreq network;
2093
2093
unsigned int if_index = if_nametoindex(interface);
2103
2103
}
2104
2104
2105
2105
if(not interface_is_up(interface)){
2106
int ret_errno = 0;
2107
int ioctl_errno = 0;
2106
error_t ret_errno = 0, ioctl_errno = 0;
2108
2107
if(not get_flags(interface, &network)){
2109
2108
ret_errno = errno;
2110
2109
fprintf_plus(stderr, "Failed to get flags for interface "
2197
2196
2198
2197
/* Sleep checking until interface is running.
2199
2198
Check every 0.25s, up to total time of delay */
2200
for(int i = 0; i < delay * 4; i++){
2199
for(int i=0; i < delay * 4; i++){
2201
2200
if(interface_is_running(interface)){
2202
2201
break;
2203
2202
}
2213
2212
}
2214
2213
2215
2214
__attribute__((nonnull, warn_unused_result))
2216
int take_down_interface(const char *const interface){
2217
int old_errno = errno;
2215
error_t take_down_interface(const char *const interface){
2216
error_t old_errno = errno;
2218
2217
struct ifreq network;
2219
2218
unsigned int if_index = if_nametoindex(interface);
2220
2219
if(if_index == 0){
2223
2222
return ENXIO;
2224
2223
}
2225
2224
if(interface_is_up(interface)){
2226
int ret_errno = 0;
2227
int ioctl_errno = 0;
2225
error_t ret_errno = 0, ioctl_errno = 0;
2228
2226
if(not get_flags(interface, &network) and debug){
2229
2227
ret_errno = errno;
2230
2228
fprintf_plus(stderr, "Failed to get flags for interface "
2480
2478
.args_doc = "",
2481
2479
.doc = "Mandos client -- Get and decrypt"
2482
2480
" passwords from a Mandos server" };
2483
ret_errno = argp_parse(&argp, argc, argv,
2484
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2485
switch(ret_errno){
2481
ret = argp_parse(&argp, argc, argv,
2482
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2483
switch(ret){
2486
2484
case 0:
2487
2485
break;
2488
2486
case ENOMEM:
2489
2487
default:
2490
errno = ret_errno;
2488
errno = ret;
2491
2489
perror_plus("argp_parse");
2492
2490
exitcode = EX_OSERR;
2493
2491
goto end;
2499
2497
2500
2498
{
2501
2499
/* Work around Debian bug #633582:
2502
<https://bugs.debian.org/633582> */
2500
<http://bugs.debian.org/633582> */
2503
2501
2504
2502
/* Re-raise privileges */
2505
ret = raise_privileges();
2506
if(ret != 0){
2507
errno = ret;
2503
ret_errno = raise_privileges();
2504
if(ret_errno != 0){
2505
errno = ret_errno;
2508
2506
perror_plus("Failed to raise privileges");
2509
2507
} else {
2510
2508
struct stat st;
2574
2572
}
2575
2573
2576
2574
/* Lower privileges */
2577
ret = lower_privileges();
2578
if(ret != 0){
2579
errno = ret;
2575
ret_errno = lower_privileges();
2576
if(ret_errno != 0){
2577
errno = ret_errno;
2580
2578
perror_plus("Failed to lower privileges");
2581
2579
}
2582
2580
}
2910
2908
2911
2909
/* Allocate a new server */
2912
2910
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2913
&config, NULL, NULL, &ret);
2911
&config, NULL, NULL, &ret_errno);
2914
2912
2915
2913
/* Free the Avahi configuration data */
2916
2914
avahi_server_config_free(&config);
2919
2917
/* Check if creating the Avahi server object succeeded */
2920
2918
if(mc.server == NULL){
2921
2919
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2922
avahi_strerror(ret));
2920
avahi_strerror(ret_errno));
2923
2921
exitcode = EX_UNAVAILABLE;
2924
2922
goto end;
2925
2923
}
2960
2958
end:
2961
2959
2962
2960
if(debug){
2963
if(signal_received){
2964
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2965
argv[0], signal_received,
2966
strsignal(signal_received));
2967
} else {
2968
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2969
}
2961
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2970
2962
}
2971
2963
2972
2964
/* Cleanup things */
2983
2975
2984
2976
if(gnutls_initialized){
2985
2977
gnutls_certificate_free_credentials(mc.cred);
2978
gnutls_global_deinit();
2986
2979
gnutls_dh_params_deinit(mc.dh_params);
2987
2980
}
2988
2981
3011
3004
3012
3005
/* Re-raise privileges */
3013
3006
{
3014
ret = raise_privileges();
3015
if(ret != 0){
3016
errno = ret;
3007
ret_errno = raise_privileges();
3008
if(ret_errno != 0){
3009
errno = ret_errno;
3017
3010
perror_plus("Failed to raise privileges");
3018
3011
} else {
3019
3012
3024
3017
/* Take down the network interfaces which were brought up */
3025
3018
{
3026
3019
char *interface = NULL;
3027
while((interface = argz_next(interfaces_to_take_down,
3028
interfaces_to_take_down_size,
3029
interface))){
3030
ret = take_down_interface(interface);
3031
if(ret != 0){
3032
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;
3033
3026
perror_plus("Failed to take down interface");
3034
3027
}
3035
3028
}
3040
3033
}
3041
3034
}
3042
3035
3043
ret = lower_privileges_permanently();
3044
if(ret != 0){
3045
errno = ret;
3036
ret_errno = lower_privileges_permanently();
3037
if(ret_errno != 0){
3038
errno = ret_errno;
3046
3039
perror_plus("Failed to lower privileges permanently");
3047
3040
}
3048
3041
}
3050
3043
free(interfaces_to_take_down);
3051
3044
free(interfaces_hooks);
3052
3045
3053
void clean_dir_at(int base, const char * const dirname,
3054
uintmax_t level){
3055
struct dirent **direntries = NULL;
3056
int dret;
3057
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3058
O_RDONLY
3059
| O_NOFOLLOW
3060
| O_DIRECTORY
3061
| O_PATH));
3062
if(dir_fd == -1){
3063
perror_plus("open");
3064
}
3065
int numentries = scandirat(dir_fd, ".", &direntries,
3066
notdotentries, alphasort);
3067
if(numentries >= 0){
3068
for(int i = 0; i < numentries; i++){
3069
if(debug){
3070
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3071
dirname, direntries[i]->d_name);
3072
}
3073
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3074
if(dret == -1){
3075
if(errno == EISDIR){
3076
dret = unlinkat(dir_fd, direntries[i]->d_name,
3077
AT_REMOVEDIR);
3078
}
3079
if((dret == -1) and (errno == ENOTEMPTY)
3080
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3081
== 0) and (level == 0)){
3082
/* Recurse only in this special case */
3083
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3084
dret = 0;
3085
}
3086
if(dret == -1){
3087
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3088
direntries[i]->d_name, strerror(errno));
3089
}
3090
}
3091
free(direntries[i]);
3092
}
3093
3094
/* need to clean even if 0 because man page doesn't specify */
3095
free(direntries);
3096
if(numentries == -1){
3097
perror_plus("scandirat");
3098
}
3099
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3100
if(dret == -1 and errno != ENOENT){
3101
perror_plus("rmdir");
3102
}
3103
} else {
3104
perror_plus("scandirat");
3105
}
3106
close(dir_fd);
3107
}
3108
3109
3046
/* Removes the GPGME temp directory and all files inside */
3110
3047
if(tempdir != NULL){
3111
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
}
3112
3091
}
3113
3092
3114
3093
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0