r9728: A *major* update to the credentials system, to incorporate the

Kerberos CCACHE into the system.

This again allows the use of the system ccache when no username is
specified, and brings more code in common between gensec_krb5 and
gensec_gssapi.

It also has a side-effect that may (or may not) be expected: If there
is a ccache, even if it is not used (perhaps the remote server didn't
want kerberos), it will change the default username.

Andrew Bartlett
(This used to be commit 6202267f6ec1446d6bd11d1d37d05a977bc8d315)

1 files changed, 68 insertions, 80 deletions

diff --git a/source4/auth/gensec/gensec_krb5.c b/source4/auth/gensec/gensec_krb5.c
index a89f46a411..09722af10b 100644
--- a/source4/auth/gensec/gensec_krb5.c
+++ b/source4/auth/gensec/gensec_krb5.c
@@ -45,7 +45,6 @@ struct gensec_krb5_state {
 	enum GENSEC_KRB5_STATE state_position;
 	struct smb_krb5_context *smb_krb5_context;
 	krb5_auth_context auth_context;
-	krb5_ccache ccache;
 	krb5_data ticket;
 	krb5_keyblock *keyblock;
 	char *peer_principal;
@@ -75,7 +74,6 @@ static int gensec_krb5_destory(void *ptr)
 static NTSTATUS gensec_krb5_start(struct gensec_security *gensec_security)
 {
 	struct gensec_krb5_state *gensec_krb5_state;
-	krb5_error_code ret = 0;
 
 	gensec_krb5_state = talloc(gensec_security, struct gensec_krb5_state);
 	if (!gensec_krb5_state) {
@@ -85,7 +83,6 @@ static NTSTATUS gensec_krb5_start(struct gensec_security *gensec_security)
 	gensec_security->private_data = gensec_krb5_state;
 
 	gensec_krb5_state->auth_context = NULL;
-	gensec_krb5_state->ccache = NULL;
 	ZERO_STRUCT(gensec_krb5_state->ticket);
 	ZERO_STRUCT(gensec_krb5_state->keyblock);
 	gensec_krb5_state->session_key = data_blob(NULL, 0);
@@ -93,34 +90,29 @@ static NTSTATUS gensec_krb5_start(struct gensec_security *gensec_security)
 
 	talloc_set_destructor(gensec_krb5_state, gensec_krb5_destory); 
 
-	ret = smb_krb5_init_context(gensec_krb5_state,
-				    &gensec_krb5_state->smb_krb5_context);
-	if (ret) {
-		DEBUG(1,("gensec_krb5_start: krb5_init_context failed (%s)\n", 
-			 error_message(ret)));
-		return NT_STATUS_INTERNAL_ERROR;
-	}
-
-	ret = krb5_auth_con_init(gensec_krb5_state->smb_krb5_context->krb5_context, &gensec_krb5_state->auth_context);
-	if (ret) {
-		DEBUG(1,("gensec_krb5_start: krb5_auth_con_init failed (%s)\n", 
-			 smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, 
-						    ret, gensec_krb5_state)));
-		return NT_STATUS_INTERNAL_ERROR;
-	}
-
 	return NT_STATUS_OK;
 }
 
 static NTSTATUS gensec_krb5_server_start(struct gensec_security *gensec_security)
 {
 	NTSTATUS nt_status;
+	krb5_error_code ret = 0;
 	struct gensec_krb5_state *gensec_krb5_state;
 
 	nt_status = gensec_krb5_start(gensec_security);
 	if (!NT_STATUS_IS_OK(nt_status)) {
 		return nt_status;
 	}
+	
+	gensec_krb5_state = gensec_security->private_data;
+
+	ret = smb_krb5_init_context(gensec_krb5_state,
+				    &gensec_krb5_state->smb_krb5_context);
+	if (ret) {
+		DEBUG(1,("gensec_krb5_start: krb5_init_context failed (%s)\n", 
+			 error_message(ret)));
+		return NT_STATUS_INTERNAL_ERROR;
+	}
 
 	gensec_krb5_state = gensec_security->private_data;
 	gensec_krb5_state->state_position = GENSEC_KRB5_SERVER_START;
@@ -133,7 +125,7 @@ static NTSTATUS gensec_krb5_client_start(struct gensec_security *gensec_security
 	struct gensec_krb5_state *gensec_krb5_state;
 	krb5_error_code ret;
 	NTSTATUS nt_status;
-	const char *ccache_name;
+	struct ccache_container *ccache_container;
 
 	const char *hostname = gensec_get_target_hostname(gensec_security);
 	if (!hostname) {
@@ -154,72 +146,68 @@ static NTSTATUS gensec_krb5_client_start(struct gensec_security *gensec_security
 	gensec_krb5_state = gensec_security->private_data;
 	gensec_krb5_state->state_position = GENSEC_KRB5_CLIENT_START;
 
-	/* TODO: This is effecivly a static/global variable... 
-	 
-	   TODO: If the user set a username, we should use an in-memory CCACHE (see below)
-	*/ 
-	ret = krb5_cc_default(gensec_krb5_state->smb_krb5_context->krb5_context, &gensec_krb5_state->ccache);
+	ret = cli_credentials_get_ccache(gensec_security->credentials, &ccache_container);
 	if (ret) {
-		DEBUG(1,("krb5_cc_default failed (%s)\n",
-			 smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
-		return NT_STATUS_INTERNAL_ERROR;
+		DEBUG(1,("gensec_krb5_start: cli_credentials_get_ccache failed: %s\n", 
+			 error_message(ret)));
+		return NT_STATUS_UNSUCCESSFUL;
 	}
-	
-	while (1) {
-		{
-			krb5_data in_data;
-			in_data.length = 0;
-
-			ret = krb5_mk_req(gensec_krb5_state->smb_krb5_context->krb5_context, 
-					  &gensec_krb5_state->auth_context,
-					  AP_OPTS_USE_SUBKEY | AP_OPTS_MUTUAL_REQUIRED,
-					  gensec_get_target_service(gensec_security),
-					  hostname,
-					  &in_data, gensec_krb5_state->ccache, 
-					  &gensec_krb5_state->ticket);
-			
-		}
-		switch (ret) {
-		case 0:
-			return NT_STATUS_OK;
-		case KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN:
-			DEBUG(3, ("Server [%s] is not registered with our KDC: %s\n", 
-				  hostname, smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
-			return NT_STATUS_ACCESS_DENIED;
-		case KRB5KDC_ERR_PREAUTH_FAILED:
-		case KRB5KRB_AP_ERR_TKT_EXPIRED:
-		case KRB5_CC_END:
-			/* Too much clock skew - we will need to kinit to re-skew the clock */
-		case KRB5KRB_AP_ERR_SKEW:
-		case KRB5_KDCREP_SKEW:
-		{
-			DEBUG(3, ("kerberos (mk_req) failed: %s\n", 
-				  smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
-			/* fall down to remaining code */
-		}
 
+	gensec_krb5_state->smb_krb5_context = talloc_reference(gensec_krb5_state, ccache_container->smb_krb5_context);
 
-		/* just don't print a message for these really ordinary messages */
-		case KRB5_FCC_NOFILE:
-		case KRB5_CC_NOTFOUND:
-		case ENOENT:
-			
-		nt_status = kinit_to_ccache(gensec_krb5_state,  
-					    gensec_security->credentials,
-					    gensec_krb5_state->smb_krb5_context, 
-					    &gensec_krb5_state->ccache, 
-					    &ccache_name);
+	ret = krb5_auth_con_init(gensec_krb5_state->smb_krb5_context->krb5_context, &gensec_krb5_state->auth_context);
+	if (ret) {
+		DEBUG(1,("gensec_krb5_start: krb5_auth_con_init failed (%s)\n", 
+			 smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, 
+						    ret, gensec_krb5_state)));
+		return NT_STATUS_INTERNAL_ERROR;
+	}
+
+	if (!ret) {
+		krb5_data in_data;
+		in_data.length = 0;
 		
-		if (!NT_STATUS_IS_OK(nt_status)) {
-			return nt_status;
-		}
+		ret = krb5_mk_req(gensec_krb5_state->smb_krb5_context->krb5_context, 
+				  &gensec_krb5_state->auth_context,
+				  AP_OPTS_USE_SUBKEY | AP_OPTS_MUTUAL_REQUIRED,
+				  gensec_get_target_service(gensec_security),
+				  hostname,
+				  &in_data, ccache_container->ccache, 
+				  &gensec_krb5_state->ticket);
+		
+	}
+	switch (ret) {
+	case 0:
+		return NT_STATUS_OK;
+	case KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN:
+		DEBUG(3, ("Server [%s] is not registered with our KDC: %s\n", 
+			  hostname, smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
+		return NT_STATUS_ACCESS_DENIED;
+	case KRB5KDC_ERR_PREAUTH_FAILED:
+	case KRB5KRB_AP_ERR_TKT_EXPIRED:
+	case KRB5_CC_END:
+		/* Too much clock skew - we will need to kinit to re-skew the clock */
+	case KRB5KRB_AP_ERR_SKEW:
+	case KRB5_KDCREP_SKEW:
+	{
+		DEBUG(3, ("kerberos (mk_req) failed: %s\n", 
+			  smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
+		/* fall down to remaining code */
+	}
+	
+	
+	/* just don't print a message for these really ordinary messages */
+	case KRB5_FCC_NOFILE:
+	case KRB5_CC_NOTFOUND:
+	case ENOENT:
+		
+		return NT_STATUS_UNSUCCESSFUL;
 		break;
-
-		default:
-			DEBUG(0, ("kerberos: %s\n", 
-				  smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
-			return NT_STATUS_UNSUCCESSFUL;
-		}
+		
+	default:
+		DEBUG(0, ("kerberos: %s\n", 
+			  smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
+		return NT_STATUS_UNSUCCESSFUL;
 	}
 }