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#include <u.h>
#include <libc.h>
#include <auth.h>
#include <authsrv.h>
#include "authlocal.h"
Chalstate*
auth_challenge(char *fmt, ...)
{
char *p;
va_list arg;
Chalstate *c;
quotefmtinstall(); /* just in case */
va_start(arg, fmt);
p = vsmprint(fmt, arg);
va_end(arg);
if(p == nil)
return nil;
c = mallocz(sizeof(*c), 1);
if(c == nil){
free(p);
return nil;
}
if((c->rpc=auth_allocrpc()) == nil
|| auth_rpc(c->rpc, "start", p, strlen(p)) != ARok
|| auth_rpc(c->rpc, "read", nil, 0) != ARok){
Error:
auth_freechal(c);
free(p);
return nil;
}
if(c->rpc->narg > sizeof(c->chal)-1){
werrstr("buffer too small for challenge");
goto Error;
}
memmove(c->chal, c->rpc->arg, c->rpc->narg);
c->nchal = c->rpc->narg;
free(p);
return c;
}
AuthInfo*
auth_response(Chalstate *c)
{
int ret;
AuthInfo *ai;
ai = nil;
if(c->rpc == nil){
werrstr("auth_response: connection not open");
return nil;
}
if(c->resp == nil){
werrstr("auth_response: nil response");
return nil;
}
if(c->nresp == 0){
werrstr("auth_response: unspecified response length");
return nil;
}
if(c->user){
if(auth_rpc(c->rpc, "write", c->user, strlen(c->user)) != ARok){
/*
* if this fails we're out of phase with factotum.
* give up.
*/
goto Out;
}
}
if(auth_rpc(c->rpc, "write", c->resp, c->nresp) != ARok){
/*
* don't close the connection -- maybe we'll try again.
*/
return nil;
}
switch(ret = auth_rpc(c->rpc, "read", nil, 0)){
case ARok:
default:
werrstr("factotum protocol botch %d %s", ret, c->rpc->ibuf);
break;
case ARdone:
ai = auth_getinfo(c->rpc);
break;
}
Out:
auth_freerpc(c->rpc);
c->rpc = nil;
return ai;
}
void
auth_freechal(Chalstate *c)
{
if(c == nil)
return;
if(c->rpc != nil)
auth_freerpc(c->rpc);
memset(c, 0xBB, sizeof(*c));
free(c);
}
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