sys/src/libauth/auth_challenge.c

   1 #include <u.h>
   2 #include <libc.h>
   3 #include <auth.h>
   4 #include "authlocal.h"
   5
   6 Chalstate*
   7 auth_challenge(char *fmt, ...)
   8 {
   9         char *p;
  10         va_list arg;
  11         Chalstate *c;
  12
  13         quotefmtinstall();      /* just in case */
  14         va_start(arg, fmt);
  15         p = vsmprint(fmt, arg);
  16         va_end(arg);
  17         if(p == nil)
  18                 return nil;
  19
  20         c = mallocz(sizeof(*c), 1);
  21         if(c == nil){
  22                 free(p);
  23                 return nil;
  24         }
  25
  26         if((c->afd = open("/mnt/factotum/rpc", ORDWR)) < 0){
  27         Error:
  28                 auth_freechal(c);
  29                 free(p);
  30                 return nil;
  31         }
  32
  33         if((c->rpc=auth_allocrpc(c->afd)) == nil
  34         || auth_rpc(c->rpc, "start", p, strlen(p)) != ARok
  35         || auth_rpc(c->rpc, "read", nil, 0) != ARok)
  36                 goto Error;
  37
  38         if(c->rpc->narg > sizeof(c->chal)-1){
  39                 werrstr("buffer too small for challenge");
  40                 goto Error;
  41         }
  42         memmove(c->chal, c->rpc->arg, c->rpc->narg);
  43         c->nchal = c->rpc->narg;
  44         free(p);
  45         return c;
  46 }
  47
  48 AuthInfo*
  49 auth_response(Chalstate *c)
  50 {
  51         int ret;
  52         AuthInfo *ai;
  53
  54         ai = nil;
  55         if(c->afd < 0){
  56                 werrstr("auth_response: connection not open");
  57                 return nil;
  58         }
  59         if(c->resp == nil){
  60                 werrstr("auth_response: nil response");
  61                 return nil;
  62         }
  63         if(c->nresp == 0){
  64                 werrstr("auth_response: unspecified response length");
  65                 return nil;
  66         }
  67
  68         if(c->user){
  69                 if(auth_rpc(c->rpc, "write", c->user, strlen(c->user)) != ARok){
  70                         /*
  71                          * if this fails we're out of phase with factotum.
  72                          * give up.
  73                          */
  74                         goto Out;
  75                 }
  76         }
  77
  78         if(auth_rpc(c->rpc, "write", c->resp, c->nresp) != ARok){
  79                 /*
  80                  * don't close the connection -- maybe we'll try again.
  81                  */
  82                 return nil;
  83         }
  84
  85         switch(ret = auth_rpc(c->rpc, "read", nil, 0)){
  86         case ARok:
  87         default:
  88                 werrstr("factotum protocol botch %d %s", ret, c->rpc->ibuf);
  89                 break;
  90         case ARdone:
  91                 ai = auth_getinfo(c->rpc);
  92                 break;
  93         }
  94
  95 Out:
  96         close(c->afd);
  97         auth_freerpc(c->rpc);
  98         c->afd = -1;
  99         c->rpc = nil;
 100         return ai;
 101 }
 102
 103 void
 104 auth_freechal(Chalstate *c)
 105 {
 106         if(c == nil)
 107                 return;
 108
 109         if(c->afd >= 0)
 110                 close(c->afd);
 111         if(c->rpc != nil)
 112                 auth_freerpc(c->rpc);
 113
 114         memset(c, 0xBB, sizeof(*c));
 115         free(c);
 116 }