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#include <u.h>
#include <libc.h>
#include <bio.h>
#include <libsec.h>
#include <authsrv.h>
#include "authcmdlib.h"
Authkey okey, nkey;
int verb;
int usepass;
int convaes;
uchar zeros[16];
int convert(char**, int);
void usage(void);
void
main(int argc, char *argv[])
{
Dir *d;
char *p, *file;
int fd, len;
ARGBEGIN{
case 'p':
usepass = 1;
break;
case 'v':
verb = 1;
break;
case 'a':
convaes = 1;
break;
default:
usage();
}ARGEND
if(argc != 1)
usage();
file = argv[0];
private();
/* get original key */
if(usepass){
print("enter password file is encoded with\n");
getpass(&okey, nil, 0, 1);
} else {
getauthkey(&okey);
}
if(!verb){
print("enter password to reencode with\n");
getpass(&nkey, nil, 0, 1);
}
fd = open(file, ORDWR);
if(fd < 0)
error("can't open %s: %r\n", file);
d = dirfstat(fd);
if(d == nil)
error("can't stat %s: %r\n", file);
len = d->length;
p = malloc(len);
if(p == nil)
error("out of memory");
if(read(fd, p, len) != len)
error("can't read key file: %r\n");
len = convert(&p, len);
if(pwrite(fd, p, len, 0) != len)
error("can't write key file: %r\n");
close(fd);
exits(nil);
}
int
badname(char *s)
{
int n;
Rune r;
for (; *s != '\0'; s += n) {
n = chartorune(&r, s);
if (r == Runeerror)
return 1;
}
return 0;
}
int
convert(char **db, int len)
{
int i, nu, keydblen, keydboff, keydbaes;
char *p = *db;
keydblen = KEYDBLEN;
keydboff = KEYDBOFF;
keydbaes = len > 24 && memcmp(p, "AES KEYS", 8) == 0;
if(keydbaes){
keydblen += AESKEYLEN;
keydboff = 8+16; /* signature[8] + iv[16] */
}
len -= keydboff;
if(len % keydblen){
fprint(2, "%s: file odd length; not converting %d bytes\n", argv0, len % keydblen);
len -= len % keydblen;
}
len += keydboff;
if(keydbaes){
AESstate s;
/* make sure we have aes key for decryption */
if(memcmp(okey.aes, zeros, AESKEYLEN) == 0){
fprint(2, "%s: no aes key in NVRAM\n", argv0);
exits("no aes key");
}
setupAESstate(&s, okey.aes, AESKEYLEN, zeros);
aesCBCdecrypt((uchar*)p+8, len-8, &s);
} else {
DESstate s;
uchar k[8];
des56to64((uchar*)okey.des, k);
setupDESstate(&s, k, zeros);
desCBCdecrypt((uchar*)p, len, &s);
}
nu = 0;
for(i = keydboff; i < len; i += keydblen) {
if (badname(&p[i])) {
fprint(2, "%s: bad name %.30s... - aborting\n", argv0, &p[i]);
exits("bad name");
}
nu++;
}
if(verb){
for(i = keydboff; i < len; i += keydblen)
print("%s\n", &p[i]);
exits(nil);
}
if(convaes && !keydbaes){
char *s, *d;
keydboff = 8+16;
keydblen += AESKEYLEN;
len = keydboff + keydblen*nu;
p = realloc(p, len);
if(p == nil)
error("out of memory");
*db = p;
s = p + KEYDBOFF + nu*KEYDBLEN;
d = p + keydboff + nu*keydblen;
for(i=0; i<nu; i++){
s -= KEYDBLEN;
d -= keydblen;
memmove(d, s, KEYDBLEN);
memset(d + KEYDBLEN, 0, keydblen-KEYDBLEN);
}
keydbaes = 1;
}
genrandom((uchar*)p, keydboff);
if(keydbaes){
AESstate s;
memmove(p, "AES KEYS", 8);
setupAESstate(&s, nkey.aes, AESKEYLEN, zeros);
aesCBCencrypt((uchar*)p+8, len-8, &s);
} else {
DESstate s;
uchar k[8];
des56to64((uchar*)nkey.des, k);
setupDESstate(&s, k, zeros);
desCBCencrypt((uchar*)p, len, &s);
}
return len;
}
void
usage(void)
{
fprint(2, "usage: %s [-pva] keyfile\n", argv0);
exits("usage");
}
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