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- Committer: Teddy Hogeborn
- Date: 2016-10-08 04:24:29 UTC
- mfrom: (237.7.428 trunk)
- Revision ID: teddy@recompile.se-20161008042429-xn41ls94f91ny3ba
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
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(), strcpy() */
50
asprintf(), strncpy(), strsignal()
51
*/
51
52
#include <sys/ioctl.h> /* ioctl */
52
53
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
54
sockaddr_in6, PF_INET6,
57
58
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
59
inet_pton(), connect(),
59
60
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
61
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
61
62
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
63
*/
63
64
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
65
strtoimax() */
65
#include <errno.h> /* perror(), errno,
66
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
67
EAI_SYSTEM, ENETUNREACH,
68
EHOSTUNREACH, ECONNREFUSED, EPROTO,
69
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
70
ENOTEMPTY,
66
71
program_invocation_short_name */
67
72
#include <time.h> /* nanosleep(), time(), sleep() */
68
73
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
513
518
fprintf_plus(stderr, "GnuTLS: %s", string);
514
519
}
515
520
516
__attribute__((nonnull, warn_unused_result))
521
__attribute__((nonnull(1, 2, 4), warn_unused_result))
517
522
static int init_gnutls_global(const char *pubkeyfilename,
518
523
const char *seckeyfilename,
519
524
const char *dhparamsfilename,
525
530
fprintf_plus(stderr, "Initializing GnuTLS\n");
526
531
}
527
532
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
533
if(debug){
536
534
/* "Use a log level over 10 to enable all debugging options."
537
535
* - GnuTLS manual
545
543
if(ret != GNUTLS_E_SUCCESS){
546
544
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
547
545
safer_gnutls_strerror(ret));
548
gnutls_global_deinit();
549
546
return -1;
550
547
}
551
548
629
626
safer_gnutls_strerror(ret));
630
627
dhparamsfilename = NULL;
631
628
}
629
free(params.data);
632
630
} while(false);
633
631
}
634
632
if(dhparamsfilename == NULL){
755
753
globalfail:
756
754
757
755
gnutls_certificate_free_credentials(mc->cred);
758
gnutls_global_deinit();
759
756
gnutls_dh_params_deinit(mc->dh_params);
760
757
return -1;
761
758
}
822
819
823
820
/* Set effective uid to 0, return errno */
824
821
__attribute__((warn_unused_result))
825
error_t raise_privileges(void){
826
error_t old_errno = errno;
827
error_t ret_errno = 0;
822
int raise_privileges(void){
823
int old_errno = errno;
824
int ret = 0;
828
825
if(seteuid(0) == -1){
829
ret_errno = errno;
826
ret = errno;
830
827
}
831
828
errno = old_errno;
832
return ret_errno;
829
return ret;
833
830
}
834
831
835
832
/* Set effective and real user ID to 0. Return errno. */
836
833
__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){
834
int raise_privileges_permanently(void){
835
int old_errno = errno;
836
int ret = raise_privileges();
837
if(ret != 0){
841
838
errno = old_errno;
842
return ret_errno;
839
return ret;
843
840
}
844
841
if(setuid(0) == -1){
845
ret_errno = errno;
842
ret = errno;
846
843
}
847
844
errno = old_errno;
848
return ret_errno;
845
return ret;
849
846
}
850
847
851
848
/* Set effective user ID to unprivileged saved user ID */
852
849
__attribute__((warn_unused_result))
853
error_t lower_privileges(void){
854
error_t old_errno = errno;
855
error_t ret_errno = 0;
850
int lower_privileges(void){
851
int old_errno = errno;
852
int ret = 0;
856
853
if(seteuid(uid) == -1){
857
ret_errno = errno;
854
ret = errno;
858
855
}
859
856
errno = old_errno;
860
return ret_errno;
857
return ret;
861
858
}
862
859
863
860
/* Lower privileges permanently */
864
861
__attribute__((warn_unused_result))
865
error_t lower_privileges_permanently(void){
866
error_t old_errno = errno;
867
error_t ret_errno = 0;
862
int lower_privileges_permanently(void){
863
int old_errno = errno;
864
int ret = 0;
868
865
if(setuid(uid) == -1){
869
ret_errno = errno;
866
ret = errno;
870
867
}
871
868
errno = old_errno;
872
return ret_errno;
869
return ret;
873
870
}
874
871
875
872
/* Helper function to add_local_route() and delete_local_route() */
954
951
helper, O_RDONLY));
955
952
if(helper_fd == -1){
956
953
perror_plus("openat");
954
close(helperdir_fd);
957
955
_exit(EX_UNAVAILABLE);
958
956
}
959
957
close(helperdir_fd);
1222
1220
sizeof(struct sockaddr_in));
1223
1221
}
1224
1222
if(ret < 0){
1225
if(errno == ENETUNREACH
1223
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1226
1224
and if_index != AVAHI_IF_UNSPEC
1227
1225
and connect_to == NULL
1228
1226
and not route_added and
1241
1239
with an explicit route added with the server's address.
1242
1240
1243
1241
Avahi bug reference:
1244
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1242
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1245
1243
https://bugs.debian.org/587961
1246
1244
*/
1247
1245
if(debug){
1427
1425
&decrypted_buffer, mc);
1428
1426
if(decrypted_buffer_size >= 0){
1429
1427
1428
clearerr(stdout);
1430
1429
written = 0;
1431
1430
while(written < (size_t) decrypted_buffer_size){
1432
1431
if(quit_now){
1448
1447
}
1449
1448
written += (size_t)ret;
1450
1449
}
1450
ret = fflush(stdout);
1451
if(ret != 0){
1452
int e = errno;
1453
if(debug){
1454
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1455
strerror(errno));
1456
}
1457
errno = e;
1458
goto mandos_end;
1459
}
1451
1460
retval = 0;
1452
1461
}
1453
1462
}
1627
1636
__attribute__((nonnull, warn_unused_result))
1628
1637
bool get_flags(const char *ifname, struct ifreq *ifr){
1629
1638
int ret;
1630
error_t ret_errno;
1639
int old_errno;
1631
1640
1632
1641
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1633
1642
if(s < 0){
1634
ret_errno = errno;
1643
old_errno = errno;
1635
1644
perror_plus("socket");
1636
errno = ret_errno;
1645
errno = old_errno;
1637
1646
return false;
1638
1647
}
1639
strcpy(ifr->ifr_name, ifname);
1648
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1649
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1640
1650
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1641
1651
if(ret == -1){
1642
1652
if(debug){
1643
ret_errno = errno;
1653
old_errno = errno;
1644
1654
perror_plus("ioctl SIOCGIFFLAGS");
1645
errno = ret_errno;
1655
errno = old_errno;
1646
1656
}
1647
1657
return false;
1648
1658
}
1912
1922
return;
1913
1923
}
1914
1924
}
1915
#ifdef __GLIBC__
1916
#if __GLIBC_PREREQ(2, 15)
1917
1925
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1918
1926
runnable_hook, alphasort);
1919
#else /* not __GLIBC_PREREQ(2, 15) */
1920
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1921
alphasort);
1922
#endif /* not __GLIBC_PREREQ(2, 15) */
1923
#else /* not __GLIBC__ */
1924
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1925
alphasort);
1926
#endif /* not __GLIBC__ */
1927
1927
if(numhooks == -1){
1928
1928
perror_plus("scandir");
1929
1929
return;
2084
2084
}
2085
2085
2086
2086
__attribute__((nonnull, warn_unused_result))
2087
error_t bring_up_interface(const char *const interface,
2088
const float delay){
2089
error_t old_errno = errno;
2087
int bring_up_interface(const char *const interface,
2088
const float delay){
2089
int old_errno = errno;
2090
2090
int ret;
2091
2091
struct ifreq network;
2092
2092
unsigned int if_index = if_nametoindex(interface);
2102
2102
}
2103
2103
2104
2104
if(not interface_is_up(interface)){
2105
error_t ret_errno = 0, ioctl_errno = 0;
2105
int ret_errno = 0;
2106
int ioctl_errno = 0;
2106
2107
if(not get_flags(interface, &network)){
2107
2108
ret_errno = errno;
2108
2109
fprintf_plus(stderr, "Failed to get flags for interface "
2211
2212
}
2212
2213
2213
2214
__attribute__((nonnull, warn_unused_result))
2214
error_t take_down_interface(const char *const interface){
2215
error_t old_errno = errno;
2215
int take_down_interface(const char *const interface){
2216
int old_errno = errno;
2216
2217
struct ifreq network;
2217
2218
unsigned int if_index = if_nametoindex(interface);
2218
2219
if(if_index == 0){
2221
2222
return ENXIO;
2222
2223
}
2223
2224
if(interface_is_up(interface)){
2224
error_t ret_errno = 0, ioctl_errno = 0;
2225
int ret_errno = 0;
2226
int ioctl_errno = 0;
2225
2227
if(not get_flags(interface, &network) and debug){
2226
2228
ret_errno = errno;
2227
2229
fprintf_plus(stderr, "Failed to get flags for interface "
2287
2289
2288
2290
int main(int argc, char *argv[]){
2289
2291
mandos_context mc = { .server = NULL, .dh_bits = 0,
2290
.priority = "SECURE256:!CTYPE-X.509:"
2291
"+CTYPE-OPENPGP:!RSA", .current_server = NULL,
2292
.interfaces = NULL, .interfaces_size = 0 };
2292
.priority = "SECURE256:!CTYPE-X.509"
2293
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2294
.current_server = NULL, .interfaces = NULL,
2295
.interfaces_size = 0 };
2293
2296
AvahiSServiceBrowser *sb = NULL;
2294
2297
error_t ret_errno;
2295
2298
int ret;
2476
2479
.args_doc = "",
2477
2480
.doc = "Mandos client -- Get and decrypt"
2478
2481
" passwords from a Mandos server" };
2479
ret = argp_parse(&argp, argc, argv,
2480
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2481
switch(ret){
2482
ret_errno = argp_parse(&argp, argc, argv,
2483
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2484
switch(ret_errno){
2482
2485
case 0:
2483
2486
break;
2484
2487
case ENOMEM:
2485
2488
default:
2486
errno = ret;
2489
errno = ret_errno;
2487
2490
perror_plus("argp_parse");
2488
2491
exitcode = EX_OSERR;
2489
2492
goto end;
2495
2498
2496
2499
{
2497
2500
/* Work around Debian bug #633582:
2498
<http://bugs.debian.org/633582> */
2501
<https://bugs.debian.org/633582> */
2499
2502
2500
2503
/* Re-raise privileges */
2501
ret_errno = raise_privileges();
2502
if(ret_errno != 0){
2503
errno = ret_errno;
2504
ret = raise_privileges();
2505
if(ret != 0){
2506
errno = ret;
2504
2507
perror_plus("Failed to raise privileges");
2505
2508
} else {
2506
2509
struct stat st;
2547
2550
}
2548
2551
}
2549
2552
2550
if(strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2553
if(dh_params_file != NULL
2554
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2551
2555
int dhparams_fd = open(dh_params_file, O_RDONLY);
2552
2556
if(dhparams_fd == -1){
2553
2557
perror_plus("open");
2569
2573
}
2570
2574
2571
2575
/* Lower privileges */
2572
ret_errno = lower_privileges();
2573
if(ret_errno != 0){
2574
errno = ret_errno;
2576
ret = lower_privileges();
2577
if(ret != 0){
2578
errno = ret;
2575
2579
perror_plus("Failed to lower privileges");
2576
2580
}
2577
2581
}
2905
2909
2906
2910
/* Allocate a new server */
2907
2911
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2908
&config, NULL, NULL, &ret_errno);
2912
&config, NULL, NULL, &ret);
2909
2913
2910
2914
/* Free the Avahi configuration data */
2911
2915
avahi_server_config_free(&config);
2914
2918
/* Check if creating the Avahi server object succeeded */
2915
2919
if(mc.server == NULL){
2916
2920
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2917
avahi_strerror(ret_errno));
2921
avahi_strerror(ret));
2918
2922
exitcode = EX_UNAVAILABLE;
2919
2923
goto end;
2920
2924
}
2955
2959
end:
2956
2960
2957
2961
if(debug){
2958
fprintf_plus(stderr, "%s exiting\n", argv[0]);
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
}
2959
2969
}
2960
2970
2961
2971
/* Cleanup things */
2972
2982
2973
2983
if(gnutls_initialized){
2974
2984
gnutls_certificate_free_credentials(mc.cred);
2975
gnutls_global_deinit();
2976
2985
gnutls_dh_params_deinit(mc.dh_params);
2977
2986
}
2978
2987
3001
3010
3002
3011
/* Re-raise privileges */
3003
3012
{
3004
ret_errno = raise_privileges();
3005
if(ret_errno != 0){
3006
errno = ret_errno;
3013
ret = raise_privileges();
3014
if(ret != 0){
3015
errno = ret;
3007
3016
perror_plus("Failed to raise privileges");
3008
3017
} else {
3009
3018
3017
3026
while((interface=argz_next(interfaces_to_take_down,
3018
3027
interfaces_to_take_down_size,
3019
3028
interface))){
3020
ret_errno = take_down_interface(interface);
3021
if(ret_errno != 0){
3022
errno = ret_errno;
3029
ret = take_down_interface(interface);
3030
if(ret != 0){
3031
errno = ret;
3023
3032
perror_plus("Failed to take down interface");
3024
3033
}
3025
3034
}
3030
3039
}
3031
3040
}
3032
3041
3033
ret_errno = lower_privileges_permanently();
3034
if(ret_errno != 0){
3035
errno = ret_errno;
3042
ret = lower_privileges_permanently();
3043
if(ret != 0){
3044
errno = ret;
3036
3045
perror_plus("Failed to lower privileges permanently");
3037
3046
}
3038
3047
}
3040
3049
free(interfaces_to_take_down);
3041
3050
free(interfaces_hooks);
3042
3051
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
3043
3108
/* Removes the GPGME temp directory and all files inside */
3044
3109
if(tempdir != NULL){
3045
struct dirent **direntries = NULL;
3046
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3047
| O_NOFOLLOW
3048
| O_DIRECTORY
3049
| O_PATH));
3050
if(tempdir_fd == -1){
3051
perror_plus("open");
3052
} else {
3053
#ifdef __GLIBC__
3054
#if __GLIBC_PREREQ(2, 15)
3055
int numentries = scandirat(tempdir_fd, ".", &direntries,
3056
notdotentries, alphasort);
3057
#else /* not __GLIBC_PREREQ(2, 15) */
3058
int numentries = scandir(tempdir, &direntries, notdotentries,
3059
alphasort);
3060
#endif /* not __GLIBC_PREREQ(2, 15) */
3061
#else /* not __GLIBC__ */
3062
int numentries = scandir(tempdir, &direntries, notdotentries,
3063
alphasort);
3064
#endif /* not __GLIBC__ */
3065
if(numentries >= 0){
3066
for(int i = 0; i < numentries; i++){
3067
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
3068
if(ret == -1){
3069
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
3070
" \"%s\", 0): %s\n", tempdir,
3071
direntries[i]->d_name, strerror(errno));
3072
}
3073
free(direntries[i]);
3074
}
3075
3076
/* need to clean even if 0 because man page doesn't specify */
3077
free(direntries);
3078
if(numentries == -1){
3079
perror_plus("scandir");
3080
}
3081
ret = rmdir(tempdir);
3082
if(ret == -1 and errno != ENOENT){
3083
perror_plus("rmdir");
3084
}
3085
}
3086
close(tempdir_fd);
3087
}
3110
clean_dir_at(-1, tempdir, 0);
3088
3111
}
3089
3112
3090
3113
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0