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* "browse_callback", and parts of "main".
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11
* Everything else is
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* Copyright © 2008-2018 Teddy Hogeborn
13
* Copyright © 2008-2018 Björn Påhlsson
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* This file is part of Mandos.
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* Mandos is free software: you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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* Mandos is distributed in the hope that it will be useful, but
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* Copyright © 2008-2015 Teddy Hogeborn
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* Copyright © 2008-2015 Björn Påhlsson
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.
20
* This program is distributed in the hope that it will be useful, but
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21
* WITHOUT ANY WARRANTY; without even the implied warranty of
24
22
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25
23
* General Public License for more details.
27
25
* You should have received a copy of the GNU General Public License
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
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* along with this program. If not, see
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* <http://www.gnu.org/licenses/>.
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* Contact the authors at <mandos@recompile.se>.
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#include <sys/socket.h> /* socket(), struct sockaddr_in6,
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inet_pton(), connect(),
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#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
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#include <fcntl.h> /* open(), unlinkat() */
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61
#include <dirent.h> /* opendir(), struct dirent, readdir()
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#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
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#include <errno.h> /* perror(), errno, EINTR, EINVAL,
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EAI_SYSTEM, ENETUNREACH,
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EHOSTUNREACH, ECONNREFUSED, EPROTO,
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EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
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#include <errno.h> /* perror(), errno,
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program_invocation_short_name */
73
67
#include <time.h> /* nanosleep(), time(), sleep() */
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68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
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safer_gnutls_strerror(ret));
577
/* If a Diffie-Hellman parameters file was given, try to use it */
578
if(dhparamsfilename != NULL){
579
gnutls_datum_t params = { .data = NULL, .size = 0 };
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int dhpfile = open(dhparamsfilename, O_RDONLY);
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dhparamsfilename = NULL;
587
size_t params_capacity = 0;
578
if(mc->dh_bits == 0){
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/* Find out the optimal number of DH bits */
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/* Try to read the private key file */
581
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
583
int secfile = open(seckeyfilename, O_RDONLY);
584
size_t buffer_capacity = 0;
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params_capacity = incbuffer((char **)¶ms.data,
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(size_t)params_capacity);
592
if(params_capacity == 0){
586
buffer_capacity = incbuffer((char **)&buffer.data,
588
(size_t)buffer_capacity);
589
if(buffer_capacity == 0){
593
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perror_plus("incbuffer");
596
dhparamsfilename = NULL;
599
ssize_t bytes_read = read(dhpfile,
600
params.data + params.size,
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ssize_t bytes_read = read(secfile, buffer.data + buffer.size,
603
598
if(bytes_read == 0){
606
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/* check bytes_read for failure */
607
602
if(bytes_read < 0){
608
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perror_plus("read");
611
dhparamsfilename = NULL;
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params.size += (unsigned int)bytes_read;
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if(params.data == NULL){
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dhparamsfilename = NULL;
619
if(dhparamsfilename == NULL){
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ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
623
GNUTLS_X509_FMT_PEM);
624
if(ret != GNUTLS_E_SUCCESS){
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fprintf_plus(stderr, "Failed to parse DH parameters in file"
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" \"%s\": %s\n", dhparamsfilename,
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safer_gnutls_strerror(ret));
628
dhparamsfilename = NULL;
633
if(dhparamsfilename == NULL){
634
if(mc->dh_bits == 0){
635
/* Find out the optimal number of DH bits */
636
/* Try to read the private key file */
637
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
639
int secfile = open(seckeyfilename, O_RDONLY);
644
size_t buffer_capacity = 0;
646
buffer_capacity = incbuffer((char **)&buffer.data,
648
(size_t)buffer_capacity);
649
if(buffer_capacity == 0){
650
perror_plus("incbuffer");
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ssize_t bytes_read = read(secfile,
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buffer.data + buffer.size,
662
/* check bytes_read for failure */
669
buffer.size += (unsigned int)bytes_read;
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/* If successful, use buffer to parse private key */
674
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
675
if(buffer.data != NULL){
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gnutls_openpgp_privkey_t privkey = NULL;
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ret = gnutls_openpgp_privkey_init(&privkey);
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buffer.size += (unsigned int)bytes_read;
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/* If successful, use buffer to parse private key */
613
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
614
if(buffer.data != NULL){
616
gnutls_openpgp_privkey_t privkey = NULL;
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ret = gnutls_openpgp_privkey_init(&privkey);
618
if(ret != GNUTLS_E_SUCCESS){
619
fprintf_plus(stderr, "Error initializing OpenPGP key"
620
" structure: %s", safer_gnutls_strerror(ret));
624
ret = gnutls_openpgp_privkey_import(privkey, &buffer,
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GNUTLS_OPENPGP_FMT_BASE64,
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if(ret != GNUTLS_E_SUCCESS){
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fprintf_plus(stderr, "Error initializing OpenPGP key"
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fprintf_plus(stderr, "Error importing OpenPGP key : %s",
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safer_gnutls_strerror(ret));
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ret = gnutls_openpgp_privkey_import
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(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
688
if(ret != GNUTLS_E_SUCCESS){
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fprintf_plus(stderr, "Error importing OpenPGP key : %s",
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safer_gnutls_strerror(ret));
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/* Use private key to suggest an appropriate
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sec_param = gnutls_openpgp_privkey_sec_param(privkey);
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gnutls_openpgp_privkey_deinit(privkey);
701
fprintf_plus(stderr, "This OpenPGP key implies using"
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" a GnuTLS security parameter \"%s\".\n",
703
safe_string(gnutls_sec_param_get_name
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if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
710
/* Err on the side of caution */
711
sec_param = GNUTLS_SEC_PARAM_ULTRA;
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fprintf_plus(stderr, "Falling back to security parameter"
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safe_string(gnutls_sec_param_get_name
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/* Use private key to suggest an appropriate sec_param */
636
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
637
gnutls_openpgp_privkey_deinit(privkey);
639
fprintf_plus(stderr, "This OpenPGP key implies using a"
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" GnuTLS security parameter \"%s\".\n",
641
safe_string(gnutls_sec_param_get_name
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uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
647
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
648
/* Err on the side of caution */
649
sec_param = GNUTLS_SEC_PARAM_ULTRA;
724
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
725
" implies %u DH bits; using that.\n",
651
fprintf_plus(stderr, "Falling back to security parameter"
726
653
safe_string(gnutls_sec_param_get_name
731
fprintf_plus(stderr, "Failed to get implied number of DH"
732
" bits for security parameter \"%s\"): %s\n",
658
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
662
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
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" implies %u DH bits; using that.\n",
733
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safe_string(gnutls_sec_param_get_name
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safer_gnutls_strerror(ret));
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fprintf_plus(stderr, "DH bits explicitly set to %u\n",
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ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
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if(ret != GNUTLS_E_SUCCESS){
744
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
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" bits): %s\n", mc->dh_bits,
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fprintf_plus(stderr, "Failed to get implied number of DH"
670
" bits for security parameter \"%s\"): %s\n",
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safe_string(gnutls_sec_param_get_name(sec_param)),
746
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safer_gnutls_strerror(ret));
676
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
679
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
680
if(ret != GNUTLS_E_SUCCESS){
681
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u bits):"
682
" %s\n", mc->dh_bits, safer_gnutls_strerror(ret));
750
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gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
821
760
/* Set effective uid to 0, return errno */
822
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__attribute__((warn_unused_result))
823
int raise_privileges(void){
824
int old_errno = errno;
762
error_t raise_privileges(void){
763
error_t old_errno = errno;
764
error_t ret_errno = 0;
826
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if(seteuid(0) == -1){
829
768
errno = old_errno;
833
772
/* Set effective and real user ID to 0. Return errno. */
834
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__attribute__((warn_unused_result))
835
int raise_privileges_permanently(void){
836
int old_errno = errno;
837
int ret = raise_privileges();
774
error_t raise_privileges_permanently(void){
775
error_t old_errno = errno;
776
error_t ret_errno = raise_privileges();
839
778
errno = old_errno;
842
781
if(setuid(0) == -1){
845
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errno = old_errno;
849
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/* Set effective user ID to unprivileged saved user ID */
850
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__attribute__((warn_unused_result))
851
int lower_privileges(void){
852
int old_errno = errno;
790
error_t lower_privileges(void){
791
error_t old_errno = errno;
792
error_t ret_errno = 0;
854
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if(seteuid(uid) == -1){
857
796
errno = old_errno;
861
800
/* Lower privileges permanently */
862
801
__attribute__((warn_unused_result))
863
int lower_privileges_permanently(void){
864
int old_errno = errno;
802
error_t lower_privileges_permanently(void){
803
error_t old_errno = errno;
804
error_t ret_errno = 0;
866
805
if(setuid(uid) == -1){
869
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errno = old_errno;
873
812
/* Helper function to add_local_route() and delete_local_route() */
1926
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1928
perror_plus("open(\"/dev/null\", O_RDONLY)");
1852
#if __GLIBC_PREREQ(2, 15)
1931
1853
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1932
1854
runnable_hook, alphasort);
1855
#else /* not __GLIBC_PREREQ(2, 15) */
1856
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1858
#endif /* not __GLIBC_PREREQ(2, 15) */
1859
#else /* not __GLIBC__ */
1860
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1862
#endif /* not __GLIBC__ */
1933
1863
if(numhooks == -1){
1934
1864
perror_plus("scandir");
1938
1867
struct dirent *direntry;
1869
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1871
perror_plus("open(\"/dev/null\", O_RDONLY)");
1940
1874
for(int i = 0; i < numhooks; i++){
1941
1875
direntry = direntries[i];
3051
2945
free(interfaces_to_take_down);
3052
2946
free(interfaces_hooks);
3054
void clean_dir_at(int base, const char * const dirname,
3056
struct dirent **direntries = NULL;
3058
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3064
perror_plus("open");
3066
int numentries = scandirat(dir_fd, ".", &direntries,
3067
notdotentries, alphasort);
3068
if(numentries >= 0){
3069
for(int i = 0; i < numentries; i++){
3071
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3072
dirname, direntries[i]->d_name);
3074
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3076
if(errno == EISDIR){
3077
dret = unlinkat(dir_fd, direntries[i]->d_name,
3080
if((dret == -1) and (errno == ENOTEMPTY)
3081
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3082
== 0) and (level == 0)){
3083
/* Recurse only in this special case */
3084
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3087
if((dret == -1) and (errno != ENOENT)){
3088
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3089
direntries[i]->d_name, strerror(errno));
3092
free(direntries[i]);
3095
/* need to clean even if 0 because man page doesn't specify */
3097
if(numentries == -1){
3098
perror_plus("scandirat");
3100
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3101
if(dret == -1 and errno != ENOENT){
3102
perror_plus("rmdir");
3105
perror_plus("scandirat");
3110
2948
/* Removes the GPGME temp directory and all files inside */
3111
2949
if(tempdir != NULL){
3112
clean_dir_at(-1, tempdir, 0);
2950
struct dirent **direntries = NULL;
2951
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
2955
if(tempdir_fd == -1){
2956
perror_plus("open");
2959
#if __GLIBC_PREREQ(2, 15)
2960
int numentries = scandirat(tempdir_fd, ".", &direntries,
2961
notdotentries, alphasort);
2962
#else /* not __GLIBC_PREREQ(2, 15) */
2963
int numentries = scandir(tempdir, &direntries, notdotentries,
2965
#endif /* not __GLIBC_PREREQ(2, 15) */
2966
#else /* not __GLIBC__ */
2967
int numentries = scandir(tempdir, &direntries, notdotentries,
2969
#endif /* not __GLIBC__ */
2970
if(numentries >= 0){
2971
for(int i = 0; i < numentries; i++){
2972
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2974
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2975
" \"%s\", 0): %s\n", tempdir,
2976
direntries[i]->d_name, strerror(errno));
2978
free(direntries[i]);
2981
/* need to clean even if 0 because man page doesn't specify */
2983
if(numentries == -1){
2984
perror_plus("scandir");
2986
ret = rmdir(tempdir);
2987
if(ret == -1 and errno != ENOENT){
2988
perror_plus("rmdir");
2991
TEMP_FAILURE_RETRY(close(tempdir_fd));