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#include <u.h>
#include <libc.h>
#include <fcall.h>
#include <auth.h>
#include "authlocal.h"
enum {
ARgiveup = 100,
};
static uchar*
gstring(uchar *p, uchar *ep, char **s)
{
uint n;
if(p == nil)
return nil;
if(p+BIT16SZ > ep)
return nil;
n = GBIT16(p);
p += BIT16SZ;
if(p+n > ep)
return nil;
*s = malloc(n+1);
memmove((*s), p, n);
(*s)[n] = '\0';
p += n;
return p;
}
static uchar*
gcarray(uchar *p, uchar *ep, uchar **s, int *np)
{
uint n;
if(p == nil)
return nil;
if(p+BIT16SZ > ep)
return nil;
n = GBIT16(p);
p += BIT16SZ;
if(p+n > ep)
return nil;
*s = malloc(n);
if(*s == nil)
return nil;
memmove((*s), p, n);
*np = n;
p += n;
return p;
}
void
auth_freeAI(AuthInfo *ai)
{
if(ai == nil)
return;
free(ai->cuid);
free(ai->suid);
free(ai->cap);
free(ai->secret);
free(ai);
}
static uchar*
convM2AI(uchar *p, int n, AuthInfo **aip)
{
uchar *e = p+n;
AuthInfo *ai;
ai = mallocz(sizeof(*ai), 1);
if(ai == nil)
return nil;
p = gstring(p, e, &ai->cuid);
p = gstring(p, e, &ai->suid);
p = gstring(p, e, &ai->cap);
p = gcarray(p, e, &ai->secret, &ai->nsecret);
if(p == nil)
auth_freeAI(ai);
else
*aip = ai;
return p;
}
AuthInfo*
auth_getinfo(AuthRpc *rpc)
{
AuthInfo *a;
if(auth_rpc(rpc, "authinfo", nil, 0) != ARok)
return nil;
if(convM2AI((uchar*)rpc->arg, rpc->narg, &a) == nil){
werrstr("bad auth info from factotum");
return nil;
}
return a;
}
static int
dorpc(AuthRpc *rpc, char *verb, char *val, int len, AuthGetkey *getkey)
{
int ret;
for(;;){
if((ret = auth_rpc(rpc, verb, val, len)) != ARneedkey && ret != ARbadkey)
return ret;
if(getkey == nil)
return ARgiveup; /* don't know how */
if((*getkey)(rpc->arg) < 0)
return ARgiveup; /* user punted */
}
}
/*
* this just proxies what the factotum tells it to.
*/
AuthInfo*
fauth_proxy(int fd, AuthRpc *rpc, AuthGetkey *getkey, char *params)
{
char *buf;
int m, n, ret;
AuthInfo *a;
char oerr[ERRMAX];
rerrstr(oerr, sizeof oerr);
werrstr("UNKNOWN AUTH ERROR");
if(dorpc(rpc, "start", params, strlen(params), getkey) != ARok){
werrstr("fauth_proxy start: %r");
return nil;
}
buf = malloc(AuthRpcMax);
if(buf == nil)
return nil;
for(;;){
switch(dorpc(rpc, "read", nil, 0, getkey)){
case ARdone:
free(buf);
a = auth_getinfo(rpc);
errstr(oerr, sizeof oerr); /* no error, restore whatever was there */
return a;
case ARok:
if(write(fd, rpc->arg, rpc->narg) != rpc->narg){
werrstr("auth_proxy write fd: %r");
goto Error;
}
break;
case ARphase:
n = 0;
memset(buf, 0, AuthRpcMax);
while((ret = dorpc(rpc, "write", buf, n, getkey)) == ARtoosmall){
if(atoi(rpc->arg) > AuthRpcMax)
break;
m = read(fd, buf+n, atoi(rpc->arg)-n);
if(m <= 0){
if(m == 0)
werrstr("auth_proxy short read: %s", buf);
goto Error;
}
n += m;
}
if(ret != ARok){
werrstr("auth_proxy rpc write: %s: %r", buf);
goto Error;
}
break;
default:
werrstr("auth_proxy rpc: %r");
goto Error;
}
}
Error:
free(buf);
return nil;
}
AuthInfo*
auth_proxy(int fd, AuthGetkey *getkey, char *fmt, ...)
{
int afd;
char *p;
va_list arg;
AuthInfo *ai;
AuthRpc *rpc;
quotefmtinstall(); /* just in case */
va_start(arg, fmt);
p = vsmprint(fmt, arg);
va_end(arg);
afd = open("/mnt/factotum/rpc", ORDWR);
if(afd < 0){
werrstr("opening /mnt/factotum/rpc: %r");
free(p);
return nil;
}
rpc = auth_allocrpc(afd);
if(rpc == nil){
free(p);
return nil;
}
ai = fauth_proxy(fd, rpc, getkey, p);
free(p);
auth_freerpc(rpc);
close(afd);
return ai;
}
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