int
findkey(char *keyfile, char *host, RSApub *key)
{
char *h;
Biobuf *b;
RSApub *k;
if((b = Bopen(keyfile, OREAD)) == nil)
return NoKeyFile;
for(;;){
if((k = readpublickey(b, &h)) == nil){
Bterm(b);
return NoKey;
}
if(match(h, host) != 0){
free(h);
rsapubfree(k);
continue;
}
if(mpcmp(k->n, key->n) != 0 || mpcmp(k->ek, key->ek) != 0){
free(h);
rsapubfree(k);
Bterm(b);
return KeyWrong;
}
free(h);
rsapubfree(k);
Bterm(b);
return KeyOk;
}
}
RSApub*
readpublickey(Biobuf *b, char **sp)
{
char *s;
RSApub *key;
key = rsapuballoc();
if(key == nil)
return nil;
for(;;){
if((s = Brdstr(b, '\n', 1)) == nil){
rsapubfree(key);
return nil;
}
if(s[0]=='#'){
free(s);
continue;
}
if(parsepubkey(s, key, sp, 10)==0
|| parsepubkey(s, key, sp, 16)==0)
return key;
fprint(2, "warning: skipping line '%s'; cannot parse\n", s);
free(s);
}
}
static void
rsa_freepub(void *a)
{
rsapubfree((RSApub*)a);
}
int
replacekey(char *keyfile, char *host, RSApub *hostkey)
{
int ret;
char *h, *nkey, *p;
Biobuf *br, *bw;
Dir *d, nd;
RSApub *k;
ret = -1;
d = nil;
nkey = smprint("%s.new", keyfile);
if(nkey == nil)
return -1;
if((br = Bopen(keyfile, OREAD)) == nil)
goto out;
if((bw = Bopen(nkey, OWRITE)) == nil){
Bterm(br);
goto out;
}
while((k = readpublickey(br, &h)) != nil){
if(match(h, host) != 0)
Bprint(bw, "%s %d %.10M %.10M\n",
h, mpsignif(k->n), k->ek, k->n);
free(h);
rsapubfree(k);
}
Bprint(bw, "%s %d %.10M %.10M\n", host, mpsignif(hostkey->n),
hostkey->ek, hostkey->n);
Bterm(bw);
Bterm(br);
d = dirstat(nkey);
if(d == nil){
fprint(2, "new key file disappeared?\n");
goto out;
}
p = strrchr(d->name, '.');
if(p == nil || strcmp(p, ".new") != 0){
fprint(2, "%s: new key file changed names? %s to %s\n",
argv0, nkey, d->name);
goto out;
}
*p = '\0';
nulldir(&nd);
nd.name = d->name;
if(remove(keyfile) < 0){
fprint(2, "%s: error removing %s: %r\n", argv0, keyfile);
goto out;
}
if(dirwstat(nkey, &nd) < 0){
fprint(2, "%s: error renaming %s to %s: %r\n",
argv0, nkey, d->name);
goto out;
}
ret = 0;
out:
free(d);
free(nkey);
return ret;
}
