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- Committer: Teddy Hogeborn
- Date: 2015-10-04 13:44:03 UTC
- 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() */
50
asprintf(), strcpy() */
51
51
#include <sys/ioctl.h> /* ioctl */
52
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
53
sockaddr_in6, PF_INET6,
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
58
inet_pton(), connect(),
59
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
#include <fcntl.h> /* open(), unlinkat() */
61
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
62
*/
63
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
64
strtoimax() */
65
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
66
EAI_SYSTEM, ENETUNREACH,
67
EHOSTUNREACH, ECONNREFUSED, EPROTO,
68
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
69
ENOTEMPTY,
65
#include <errno.h> /* perror(), errno,
70
66
program_invocation_short_name */
71
67
#include <time.h> /* nanosleep(), time(), sleep() */
72
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
517
513
fprintf_plus(stderr, "GnuTLS: %s", string);
518
514
}
519
515
520
__attribute__((nonnull(1, 2, 4), warn_unused_result))
516
__attribute__((nonnull, warn_unused_result))
521
517
static int init_gnutls_global(const char *pubkeyfilename,
522
518
const char *seckeyfilename,
523
519
const char *dhparamsfilename,
529
525
fprintf_plus(stderr, "Initializing GnuTLS\n");
530
526
}
531
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
532
535
if(debug){
533
536
/* "Use a log level over 10 to enable all debugging options."
534
537
* - GnuTLS manual
542
545
if(ret != GNUTLS_E_SUCCESS){
543
546
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
544
547
safer_gnutls_strerror(ret));
548
gnutls_global_deinit();
545
549
return -1;
546
550
}
547
551
751
755
globalfail:
752
756
753
757
gnutls_certificate_free_credentials(mc->cred);
758
gnutls_global_deinit();
754
759
gnutls_dh_params_deinit(mc->dh_params);
755
760
return -1;
756
761
}
817
822
818
823
/* Set effective uid to 0, return errno */
819
824
__attribute__((warn_unused_result))
820
int raise_privileges(void){
821
int old_errno = errno;
822
int ret = 0;
825
error_t raise_privileges(void){
826
error_t old_errno = errno;
827
error_t ret_errno = 0;
823
828
if(seteuid(0) == -1){
824
ret = errno;
829
ret_errno = errno;
825
830
}
826
831
errno = old_errno;
827
return ret;
832
return ret_errno;
828
833
}
829
834
830
835
/* Set effective and real user ID to 0. Return errno. */
831
836
__attribute__((warn_unused_result))
832
int raise_privileges_permanently(void){
833
int old_errno = errno;
834
int ret = raise_privileges();
835
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){
836
841
errno = old_errno;
837
return ret;
842
return ret_errno;
838
843
}
839
844
if(setuid(0) == -1){
840
ret = errno;
845
ret_errno = errno;
841
846
}
842
847
errno = old_errno;
843
return ret;
848
return ret_errno;
844
849
}
845
850
846
851
/* Set effective user ID to unprivileged saved user ID */
847
852
__attribute__((warn_unused_result))
848
int lower_privileges(void){
849
int old_errno = errno;
850
int ret = 0;
853
error_t lower_privileges(void){
854
error_t old_errno = errno;
855
error_t ret_errno = 0;
851
856
if(seteuid(uid) == -1){
852
ret = errno;
857
ret_errno = errno;
853
858
}
854
859
errno = old_errno;
855
return ret;
860
return ret_errno;
856
861
}
857
862
858
863
/* Lower privileges permanently */
859
864
__attribute__((warn_unused_result))
860
int lower_privileges_permanently(void){
861
int old_errno = errno;
862
int ret = 0;
865
error_t lower_privileges_permanently(void){
866
error_t old_errno = errno;
867
error_t ret_errno = 0;
863
868
if(setuid(uid) == -1){
864
ret = errno;
869
ret_errno = errno;
865
870
}
866
871
errno = old_errno;
867
return ret;
872
return ret_errno;
868
873
}
869
874
870
875
/* Helper function to add_local_route() and delete_local_route() */
1218
1223
sizeof(struct sockaddr_in));
1219
1224
}
1220
1225
if(ret < 0){
1221
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1226
if(errno == ENETUNREACH
1222
1227
and if_index != AVAHI_IF_UNSPEC
1223
1228
and connect_to == NULL
1224
1229
and not route_added and
1623
1628
__attribute__((nonnull, warn_unused_result))
1624
1629
bool get_flags(const char *ifname, struct ifreq *ifr){
1625
1630
int ret;
1626
int old_errno;
1631
error_t ret_errno;
1627
1632
1628
1633
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1629
1634
if(s < 0){
1630
old_errno = errno;
1635
ret_errno = errno;
1631
1636
perror_plus("socket");
1632
errno = old_errno;
1637
errno = ret_errno;
1633
1638
return false;
1634
1639
}
1635
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1636
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1640
strcpy(ifr->ifr_name, ifname);
1637
1641
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1638
1642
if(ret == -1){
1639
1643
if(debug){
1640
old_errno = errno;
1644
ret_errno = errno;
1641
1645
perror_plus("ioctl SIOCGIFFLAGS");
1642
errno = old_errno;
1646
errno = ret_errno;
1643
1647
}
1644
1648
return false;
1645
1649
}
1909
1913
return;
1910
1914
}
1911
1915
}
1916
#ifdef __GLIBC__
1917
#if __GLIBC_PREREQ(2, 15)
1912
1918
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1913
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__ */
1914
1928
if(numhooks == -1){
1915
1929
perror_plus("scandir");
1916
1930
return;
2071
2085
}
2072
2086
2073
2087
__attribute__((nonnull, warn_unused_result))
2074
int bring_up_interface(const char *const interface,
2075
const float delay){
2076
int old_errno = errno;
2088
error_t bring_up_interface(const char *const interface,
2089
const float delay){
2090
error_t old_errno = errno;
2077
2091
int ret;
2078
2092
struct ifreq network;
2079
2093
unsigned int if_index = if_nametoindex(interface);
2089
2103
}
2090
2104
2091
2105
if(not interface_is_up(interface)){
2092
int ret_errno = 0;
2093
int ioctl_errno = 0;
2106
error_t ret_errno = 0, ioctl_errno = 0;
2094
2107
if(not get_flags(interface, &network)){
2095
2108
ret_errno = errno;
2096
2109
fprintf_plus(stderr, "Failed to get flags for interface "
2199
2212
}
2200
2213
2201
2214
__attribute__((nonnull, warn_unused_result))
2202
int take_down_interface(const char *const interface){
2203
int old_errno = errno;
2215
error_t take_down_interface(const char *const interface){
2216
error_t old_errno = errno;
2204
2217
struct ifreq network;
2205
2218
unsigned int if_index = if_nametoindex(interface);
2206
2219
if(if_index == 0){
2209
2222
return ENXIO;
2210
2223
}
2211
2224
if(interface_is_up(interface)){
2212
int ret_errno = 0;
2213
int ioctl_errno = 0;
2225
error_t ret_errno = 0, ioctl_errno = 0;
2214
2226
if(not get_flags(interface, &network) and debug){
2215
2227
ret_errno = errno;
2216
2228
fprintf_plus(stderr, "Failed to get flags for interface "
2466
2478
.args_doc = "",
2467
2479
.doc = "Mandos client -- Get and decrypt"
2468
2480
" passwords from a Mandos server" };
2469
ret_errno = argp_parse(&argp, argc, argv,
2470
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2471
switch(ret_errno){
2481
ret = argp_parse(&argp, argc, argv,
2482
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2483
switch(ret){
2472
2484
case 0:
2473
2485
break;
2474
2486
case ENOMEM:
2475
2487
default:
2476
errno = ret_errno;
2488
errno = ret;
2477
2489
perror_plus("argp_parse");
2478
2490
exitcode = EX_OSERR;
2479
2491
goto end;
2488
2500
<http://bugs.debian.org/633582> */
2489
2501
2490
2502
/* Re-raise privileges */
2491
ret = raise_privileges();
2492
if(ret != 0){
2493
errno = ret;
2503
ret_errno = raise_privileges();
2504
if(ret_errno != 0){
2505
errno = ret_errno;
2494
2506
perror_plus("Failed to raise privileges");
2495
2507
} else {
2496
2508
struct stat st;
2560
2572
}
2561
2573
2562
2574
/* Lower privileges */
2563
ret = lower_privileges();
2564
if(ret != 0){
2565
errno = ret;
2575
ret_errno = lower_privileges();
2576
if(ret_errno != 0){
2577
errno = ret_errno;
2566
2578
perror_plus("Failed to lower privileges");
2567
2579
}
2568
2580
}
2896
2908
2897
2909
/* Allocate a new server */
2898
2910
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2899
&config, NULL, NULL, &ret);
2911
&config, NULL, NULL, &ret_errno);
2900
2912
2901
2913
/* Free the Avahi configuration data */
2902
2914
avahi_server_config_free(&config);
2905
2917
/* Check if creating the Avahi server object succeeded */
2906
2918
if(mc.server == NULL){
2907
2919
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2908
avahi_strerror(ret));
2920
avahi_strerror(ret_errno));
2909
2921
exitcode = EX_UNAVAILABLE;
2910
2922
goto end;
2911
2923
}
2963
2975
2964
2976
if(gnutls_initialized){
2965
2977
gnutls_certificate_free_credentials(mc.cred);
2978
gnutls_global_deinit();
2966
2979
gnutls_dh_params_deinit(mc.dh_params);
2967
2980
}
2968
2981
2991
3004
2992
3005
/* Re-raise privileges */
2993
3006
{
2994
ret = raise_privileges();
2995
if(ret != 0){
2996
errno = ret;
3007
ret_errno = raise_privileges();
3008
if(ret_errno != 0){
3009
errno = ret_errno;
2997
3010
perror_plus("Failed to raise privileges");
2998
3011
} else {
2999
3012
3007
3020
while((interface=argz_next(interfaces_to_take_down,
3008
3021
interfaces_to_take_down_size,
3009
3022
interface))){
3010
ret = take_down_interface(interface);
3011
if(ret != 0){
3012
errno = ret;
3023
ret_errno = take_down_interface(interface);
3024
if(ret_errno != 0){
3025
errno = ret_errno;
3013
3026
perror_plus("Failed to take down interface");
3014
3027
}
3015
3028
}
3020
3033
}
3021
3034
}
3022
3035
3023
ret = lower_privileges_permanently();
3024
if(ret != 0){
3025
errno = ret;
3036
ret_errno = lower_privileges_permanently();
3037
if(ret_errno != 0){
3038
errno = ret_errno;
3026
3039
perror_plus("Failed to lower privileges permanently");
3027
3040
}
3028
3041
}
3030
3043
free(interfaces_to_take_down);
3031
3044
free(interfaces_hooks);
3032
3045
3033
void clean_dir_at(int base, const char * const dirname,
3034
uintmax_t level){
3035
struct dirent **direntries = NULL;
3036
int dret;
3037
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3038
O_RDONLY
3039
| O_NOFOLLOW
3040
| O_DIRECTORY
3041
| O_PATH));
3042
if(dir_fd == -1){
3043
perror_plus("open");
3044
}
3045
int numentries = scandirat(dir_fd, ".", &direntries,
3046
notdotentries, alphasort);
3047
if(numentries >= 0){
3048
for(int i = 0; i < numentries; i++){
3049
if(debug){
3050
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3051
dirname, direntries[i]->d_name);
3052
}
3053
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3054
if(dret == -1){
3055
if(errno == EISDIR){
3056
dret = unlinkat(dir_fd, direntries[i]->d_name,
3057
AT_REMOVEDIR);
3058
}
3059
if((dret == -1) and (errno == ENOTEMPTY)
3060
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3061
== 0) and (level == 0)){
3062
/* Recurse only in this special case */
3063
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3064
dret = 0;
3065
}
3066
if(dret == -1){
3067
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3068
direntries[i]->d_name, strerror(errno));
3069
}
3070
}
3071
free(direntries[i]);
3072
}
3073
3074
/* need to clean even if 0 because man page doesn't specify */
3075
free(direntries);
3076
if(numentries == -1){
3077
perror_plus("scandirat");
3078
}
3079
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3080
if(dret == -1 and errno != ENOENT){
3081
perror_plus("rmdir");
3082
}
3083
} else {
3084
perror_plus("scandirat");
3085
}
3086
close(dir_fd);
3087
}
3088
3089
3046
/* Removes the GPGME temp directory and all files inside */
3090
3047
if(tempdir != NULL){
3091
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
}
3092
3091
}
3093
3092
3094
3093
if(quit_now){
Loggerhead is a web-based interface for Breezy
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