- (djm) OpenBSD CVS Sync

   - djm@cvs.openbsd.org 2003/11/03 09:03:37
     [auth-chall.c]
     make this a little more idiot-proof; ok markus@
     (includes portable-specific changes)

1 files changed, 23 insertions, 21 deletions

diff --git a/auth-chall.c b/auth-chall.c
index 00d6e0ec5..dd55d6eb0 100644
--- a/auth-chall.c
+++ b/auth-chall.c
@@ -23,7 +23,7 @@
  */
 
 #include "includes.h"
-RCSID("$OpenBSD: auth-chall.c,v 1.8 2001/05/18 14:13:28 markus Exp $");
+RCSID("$OpenBSD: auth-chall.c,v 1.9 2003/11/03 09:03:37 djm Exp $");
 
 #include "auth.h"
 #include "log.h"
@@ -67,36 +67,38 @@ get_challenge(Authctxt *authctxt)
 int
 verify_response(Authctxt *authctxt, const char *response)
 {
-        char *resp[1];
-        int res;
+        char *resp[1], *name, *info, **prompts;
+        u_int i, numprompts, *echo_on;
+        int authenticated = 0;
 
         if (device == NULL)
                 return 0;
         if (authctxt->kbdintctxt == NULL)
                 return 0;
         resp[0] = (char *)response;
-        res = device->respond(authctxt->kbdintctxt, 1, resp);
-        if (res == 1) {
-                /* postponed - send a null query just in case */
-                char *name, *info, **prompts;
-                u_int i, numprompts, *echo_on;
+        switch (device->respond(authctxt->kbdintctxt, 1, resp)) {
+        case 0: /* Success */
+                authenticated = 1;
+                break;
+        case 1: /* Postponed - retry with empty query for PAM */
+                if ((device->query(authctxt->kbdintctxt, &name, &info,
+                    &numprompts, &prompts, &echo_on)) != 0)
+                        break;
+                if (numprompts == 0 && 
+                    device->respond(authctxt->kbdintctxt, 0, resp) == 0)
+                        authenticated = 1;
 
-                res = device->query(authctxt->kbdintctxt, &name, &info,
-                    &numprompts, &prompts, &echo_on);
-                if (res == 0) {
-                        for (i = 0; i < numprompts; i++)
-                                xfree(prompts[i]);
-                        xfree(prompts);
-                        xfree(name);
-                        xfree(echo_on);
-                        xfree(info);
-                }
-                /* if we received more prompts, we're screwed */
-                res = (res == 0 && numprompts == 0) ? 0 : -1;
+                for (i = 0; i < numprompts; i++)
+                        xfree(prompts[i]);
+                xfree(prompts);
+                xfree(name);
+                xfree(echo_on);
+                xfree(info);
+                break;
         }
         device->free_ctx(authctxt->kbdintctxt);
         authctxt->kbdintctxt = NULL;
-        return res ? 0 : 1;
+        return authenticated;
 }
 void
 abandon_challenge_response(Authctxt *authctxt)