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237.7.356
(compared to revision 237.7.447)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2016-02-28 14:33:54 UTC
- mto: (237.7.594 trunk)
- mto: This revision was merged to the branch mainline in revision 331.
- Revision ID: teddy@recompile.se-20160228143354-psgzcepr9vx6yhor
Update Debian policy manual version.
* debian/control (Source: mandos/Standards-Version): Change to 3.9.7.
* debian/control (Source: mandos/Standards-Version): Change to 3.9.7.
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2017 Teddy Hogeborn
13
* Copyright © 2008-2017 Björn Påhlsson
12
* Copyright © 2008-2016 Teddy Hogeborn
13
* Copyright © 2008-2016 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(), strncpy() */
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;
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
}
1494
1485
return retval;
1495
1486
}
1496
1487
1488
__attribute__((nonnull))
1497
1489
static void resolve_callback(AvahiSServiceResolver *r,
1498
1490
AvahiIfIndex interface,
1499
1491
AvahiProtocol proto,
1636
1628
__attribute__((nonnull, warn_unused_result))
1637
1629
bool get_flags(const char *ifname, struct ifreq *ifr){
1638
1630
int ret;
1639
int old_errno;
1631
error_t ret_errno;
1640
1632
1641
1633
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1642
1634
if(s < 0){
1643
old_errno = errno;
1635
ret_errno = errno;
1644
1636
perror_plus("socket");
1645
errno = old_errno;
1637
errno = ret_errno;
1646
1638
return false;
1647
1639
}
1648
1640
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1650
1642
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1651
1643
if(ret == -1){
1652
1644
if(debug){
1653
old_errno = errno;
1645
ret_errno = errno;
1654
1646
perror_plus("ioctl SIOCGIFFLAGS");
1655
errno = old_errno;
1647
errno = ret_errno;
1656
1648
}
1657
1649
return false;
1658
1650
}
1922
1914
return;
1923
1915
}
1924
1916
}
1917
#ifdef __GLIBC__
1918
#if __GLIBC_PREREQ(2, 15)
1925
1919
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1926
1920
runnable_hook, alphasort);
1921
#else /* not __GLIBC_PREREQ(2, 15) */
1922
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1923
alphasort);
1924
#endif /* not __GLIBC_PREREQ(2, 15) */
1925
#else /* not __GLIBC__ */
1926
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1927
alphasort);
1928
#endif /* not __GLIBC__ */
1927
1929
if(numhooks == -1){
1928
1930
perror_plus("scandir");
1929
1931
return;
2084
2086
}
2085
2087
2086
2088
__attribute__((nonnull, warn_unused_result))
2087
int bring_up_interface(const char *const interface,
2088
const float delay){
2089
int old_errno = errno;
2089
error_t bring_up_interface(const char *const interface,
2090
const float delay){
2091
error_t old_errno = errno;
2090
2092
int ret;
2091
2093
struct ifreq network;
2092
2094
unsigned int if_index = if_nametoindex(interface);
2102
2104
}
2103
2105
2104
2106
if(not interface_is_up(interface)){
2105
int ret_errno = 0;
2106
int ioctl_errno = 0;
2107
error_t ret_errno = 0, ioctl_errno = 0;
2107
2108
if(not get_flags(interface, &network)){
2108
2109
ret_errno = errno;
2109
2110
fprintf_plus(stderr, "Failed to get flags for interface "
2196
2197
2197
2198
/* Sleep checking until interface is running.
2198
2199
Check every 0.25s, up to total time of delay */
2199
for(int i = 0; i < delay * 4; i++){
2200
for(int i=0; i < delay * 4; i++){
2200
2201
if(interface_is_running(interface)){
2201
2202
break;
2202
2203
}
2212
2213
}
2213
2214
2214
2215
__attribute__((nonnull, warn_unused_result))
2215
int take_down_interface(const char *const interface){
2216
int old_errno = errno;
2216
error_t take_down_interface(const char *const interface){
2217
error_t old_errno = errno;
2217
2218
struct ifreq network;
2218
2219
unsigned int if_index = if_nametoindex(interface);
2219
2220
if(if_index == 0){
2222
2223
return ENXIO;
2223
2224
}
2224
2225
if(interface_is_up(interface)){
2225
int ret_errno = 0;
2226
int ioctl_errno = 0;
2226
error_t ret_errno = 0, ioctl_errno = 0;
2227
2227
if(not get_flags(interface, &network) and debug){
2228
2228
ret_errno = errno;
2229
2229
fprintf_plus(stderr, "Failed to get flags for interface "
2479
2479
.args_doc = "",
2480
2480
.doc = "Mandos client -- Get and decrypt"
2481
2481
" passwords from a Mandos server" };
2482
ret_errno = argp_parse(&argp, argc, argv,
2483
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2484
switch(ret_errno){
2482
ret = argp_parse(&argp, argc, argv,
2483
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2484
switch(ret){
2485
2485
case 0:
2486
2486
break;
2487
2487
case ENOMEM:
2488
2488
default:
2489
errno = ret_errno;
2489
errno = ret;
2490
2490
perror_plus("argp_parse");
2491
2491
exitcode = EX_OSERR;
2492
2492
goto end;
2498
2498
2499
2499
{
2500
2500
/* Work around Debian bug #633582:
2501
<https://bugs.debian.org/633582> */
2501
<http://bugs.debian.org/633582> */
2502
2502
2503
2503
/* Re-raise privileges */
2504
ret = raise_privileges();
2505
if(ret != 0){
2506
errno = ret;
2504
ret_errno = raise_privileges();
2505
if(ret_errno != 0){
2506
errno = ret_errno;
2507
2507
perror_plus("Failed to raise privileges");
2508
2508
} else {
2509
2509
struct stat st;
2573
2573
}
2574
2574
2575
2575
/* Lower privileges */
2576
ret = lower_privileges();
2577
if(ret != 0){
2578
errno = ret;
2576
ret_errno = lower_privileges();
2577
if(ret_errno != 0){
2578
errno = ret_errno;
2579
2579
perror_plus("Failed to lower privileges");
2580
2580
}
2581
2581
}
2909
2909
2910
2910
/* Allocate a new server */
2911
2911
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2912
&config, NULL, NULL, &ret);
2912
&config, NULL, NULL, &ret_errno);
2913
2913
2914
2914
/* Free the Avahi configuration data */
2915
2915
avahi_server_config_free(&config);
2918
2918
/* Check if creating the Avahi server object succeeded */
2919
2919
if(mc.server == NULL){
2920
2920
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2921
avahi_strerror(ret));
2921
avahi_strerror(ret_errno));
2922
2922
exitcode = EX_UNAVAILABLE;
2923
2923
goto end;
2924
2924
}
2959
2959
end:
2960
2960
2961
2961
if(debug){
2962
if(signal_received){
2963
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2964
argv[0], signal_received,
2965
strsignal(signal_received));
2966
} else {
2967
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2968
}
2962
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2969
2963
}
2970
2964
2971
2965
/* Cleanup things */
2982
2976
2983
2977
if(gnutls_initialized){
2984
2978
gnutls_certificate_free_credentials(mc.cred);
2979
gnutls_global_deinit();
2985
2980
gnutls_dh_params_deinit(mc.dh_params);
2986
2981
}
2987
2982
3010
3005
3011
3006
/* Re-raise privileges */
3012
3007
{
3013
ret = raise_privileges();
3014
if(ret != 0){
3015
errno = ret;
3008
ret_errno = raise_privileges();
3009
if(ret_errno != 0){
3010
errno = ret_errno;
3016
3011
perror_plus("Failed to raise privileges");
3017
3012
} else {
3018
3013
3023
3018
/* Take down the network interfaces which were brought up */
3024
3019
{
3025
3020
char *interface = NULL;
3026
while((interface = argz_next(interfaces_to_take_down,
3027
interfaces_to_take_down_size,
3028
interface))){
3029
ret = take_down_interface(interface);
3030
if(ret != 0){
3031
errno = ret;
3021
while((interface=argz_next(interfaces_to_take_down,
3022
interfaces_to_take_down_size,
3023
interface))){
3024
ret_errno = take_down_interface(interface);
3025
if(ret_errno != 0){
3026
errno = ret_errno;
3032
3027
perror_plus("Failed to take down interface");
3033
3028
}
3034
3029
}
3039
3034
}
3040
3035
}
3041
3036
3042
ret = lower_privileges_permanently();
3043
if(ret != 0){
3044
errno = ret;
3037
ret_errno = lower_privileges_permanently();
3038
if(ret_errno != 0){
3039
errno = ret_errno;
3045
3040
perror_plus("Failed to lower privileges permanently");
3046
3041
}
3047
3042
}
3049
3044
free(interfaces_to_take_down);
3050
3045
free(interfaces_hooks);
3051
3046
3052
void clean_dir_at(int base, const char * const dirname,
3053
uintmax_t level){
3054
struct dirent **direntries = NULL;
3055
int dret;
3056
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3057
O_RDONLY
3058
| O_NOFOLLOW
3059
| O_DIRECTORY
3060
| O_PATH));
3061
if(dir_fd == -1){
3062
perror_plus("open");
3063
}
3064
int numentries = scandirat(dir_fd, ".", &direntries,
3065
notdotentries, alphasort);
3066
if(numentries >= 0){
3067
for(int i = 0; i < numentries; i++){
3068
if(debug){
3069
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3070
dirname, direntries[i]->d_name);
3071
}
3072
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3073
if(dret == -1){
3074
if(errno == EISDIR){
3075
dret = unlinkat(dir_fd, direntries[i]->d_name,
3076
AT_REMOVEDIR);
3077
}
3078
if((dret == -1) and (errno == ENOTEMPTY)
3079
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3080
== 0) and (level == 0)){
3081
/* Recurse only in this special case */
3082
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3083
dret = 0;
3084
}
3085
if(dret == -1){
3086
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3087
direntries[i]->d_name, strerror(errno));
3088
}
3089
}
3090
free(direntries[i]);
3091
}
3092
3093
/* need to clean even if 0 because man page doesn't specify */
3094
free(direntries);
3095
if(numentries == -1){
3096
perror_plus("scandirat");
3097
}
3098
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3099
if(dret == -1 and errno != ENOENT){
3100
perror_plus("rmdir");
3101
}
3102
} else {
3103
perror_plus("scandirat");
3104
}
3105
close(dir_fd);
3106
}
3107
3108
3047
/* Removes the GPGME temp directory and all files inside */
3109
3048
if(tempdir != NULL){
3110
clean_dir_at(-1, tempdir, 0);
3049
struct dirent **direntries = NULL;
3050
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3051
| O_NOFOLLOW
3052
| O_DIRECTORY
3053
| O_PATH));
3054
if(tempdir_fd == -1){
3055
perror_plus("open");
3056
} else {
3057
#ifdef __GLIBC__
3058
#if __GLIBC_PREREQ(2, 15)
3059
int numentries = scandirat(tempdir_fd, ".", &direntries,
3060
notdotentries, alphasort);
3061
#else /* not __GLIBC_PREREQ(2, 15) */
3062
int numentries = scandir(tempdir, &direntries, notdotentries,
3063
alphasort);
3064
#endif /* not __GLIBC_PREREQ(2, 15) */
3065
#else /* not __GLIBC__ */
3066
int numentries = scandir(tempdir, &direntries, notdotentries,
3067
alphasort);
3068
#endif /* not __GLIBC__ */
3069
if(numentries >= 0){
3070
for(int i = 0; i < numentries; i++){
3071
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
3072
if(ret == -1){
3073
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
3074
" \"%s\", 0): %s\n", tempdir,
3075
direntries[i]->d_name, strerror(errno));
3076
}
3077
free(direntries[i]);
3078
}
3079
3080
/* need to clean even if 0 because man page doesn't specify */
3081
free(direntries);
3082
if(numentries == -1){
3083
perror_plus("scandir");
3084
}
3085
ret = rmdir(tempdir);
3086
if(ret == -1 and errno != ENOENT){
3087
perror_plus("rmdir");
3088
}
3089
}
3090
close(tempdir_fd);
3091
}
3111
3092
}
3112
3093
3113
3094
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0