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authsrv: salt the keyseed from /adm/keyseed file

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change the keyseed key derivation to hkdf sha256
using the hostowners des key plus 256 bit random
salt from /adm/keyseed.
This commit is contained in:
cinap_lenrek 2017-02-26 03:47:46 +01:00
parent 27498dd63a
commit 009bec0752
1 changed files with 23 additions and 3 deletions
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26
sys/src/cmd/auth/authsrv.c
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@ -1007,13 +1007,33 @@ initkeyseed(void)
{
static char info[] = "PRF key for generation of dummy user keys";
char k[DESKEYLEN], *u;
int fd;
genrandom(keyseed, sizeof(keyseed));
u = getuser();
if(!finddeskey(KEYDB, u, k)){
syslog(0, AUTHLOG, "can't generate keyseed: user %s not in keydb", u);
exits(0);
syslog(0, AUTHLOG, "initkeyseed: user %s not in keydb", u);
return;
}
hmac_sha2_256((uchar*)info, sizeof(info)-1, (uchar*)k, sizeof(k), keyseed, nil);
if((fd = create("/adm/keyseed", OWRITE|OEXCL, 0600)) >= 0){
write(fd, keyseed, sizeof(keyseed));
} else if((fd = open("/adm/keyseed", OREAD)) >= 0){
read(fd, keyseed, sizeof(keyseed));
} else{
syslog(0, AUTHLOG, "initkeyseed: no seed file: %r");
memset(k, 0, sizeof(k));
return;
}
close(fd);
hkdf_x( keyseed, sizeof(keyseed),
(uchar*)info, sizeof(info)-1,
(uchar*)k, sizeof(k),
keyseed, sizeof(keyseed),
hmac_sha2_256, SHA2_256dlen);
memset(k, 0, sizeof(k));
}