r7270: A big revamp to the way we handle kerberos errors in Samba4. We now

fill in the function pointers to handle the logging, and catch all the
kerberos warnings. (Currently at level 3).

To avoid a memory leak, this requries a new function: krb5_freelog(),
which I've added to lorikeet/heimdal.

This also required a revamp to how we handle the krb5_context, so as
to make it easier to handle with talloc destructors.

Andrew Bartlett
(This used to be commit 63272794c41231b335b73e7ccf349282f295c4d2)

1 files changed, 26 insertions, 44 deletions

diff --git a/source4/auth/gensec/gensec_krb5.c b/source4/auth/gensec/gensec_krb5.c
index 1ac46f3ac9..d633794e1c 100644
--- a/source4/auth/gensec/gensec_krb5.c
+++ b/source4/auth/gensec/gensec_krb5.c
@@ -43,7 +43,7 @@ struct gensec_krb5_state {
 	DATA_BLOB session_key;
 	DATA_BLOB pac;
 	enum GENSEC_KRB5_STATE state_position;
-	krb5_context context;
+	struct smb_krb5_context *smb_krb5_context;
 	krb5_auth_context auth_context;
 	krb5_ccache ccache;
 	krb5_data ticket;
@@ -67,7 +67,7 @@ static NTSTATUS gensec_krb5_pac_checksum(DATA_BLOB pac_data,
 	cksum.checksum.data	= sig->signature;
 
 
-	ret = krb5_crypto_init(gensec_krb5_state->context,
+	ret = krb5_crypto_init(gensec_krb5_state->smb_krb5_context->krb5_context,
 				&gensec_krb5_state->keyblock,
 				0,
 				&crypto);
@@ -77,7 +77,7 @@ static NTSTATUS gensec_krb5_pac_checksum(DATA_BLOB pac_data,
 	}
 	for (i=0; i < 40; i++) {
 		keyusage = i;
-		ret = krb5_verify_checksum(gensec_krb5_state->context,
+		ret = krb5_verify_checksum(gensec_krb5_state->smb_krb5_context->krb5_context,
 					   crypto,
 					   keyusage,
 					   pac_data.data,
@@ -88,7 +88,7 @@ static NTSTATUS gensec_krb5_pac_checksum(DATA_BLOB pac_data,
 			break;
 		}
 	}
-	krb5_crypto_destroy(gensec_krb5_state->context, crypto);
+	krb5_crypto_destroy(gensec_krb5_state->smb_krb5_context->krb5_context, crypto);
 
 	if (ret) {
 		DEBUG(0,("NOT verifying PAC checksums yet!\n"));
@@ -235,22 +235,19 @@ static int gensec_krb5_destory(void *ptr)
 	struct gensec_krb5_state *gensec_krb5_state = ptr;
 
 	if (gensec_krb5_state->ticket.length) { 
-		kerberos_free_data_contents(gensec_krb5_state->context, 
+		kerberos_free_data_contents(gensec_krb5_state->smb_krb5_context->krb5_context, 
 					    &gensec_krb5_state->ticket); 
 	}
 	/* ccache freed in a child destructor */
 
-	krb5_free_keyblock_contents(gensec_krb5_state->context, 
+	krb5_free_keyblock_contents(gensec_krb5_state->smb_krb5_context->krb5_context, 
 				    &gensec_krb5_state->keyblock);
 		
 	if (gensec_krb5_state->auth_context) {
-		krb5_auth_con_free(gensec_krb5_state->context, 
+		krb5_auth_con_free(gensec_krb5_state->smb_krb5_context->krb5_context, 
 				   gensec_krb5_state->auth_context);
 	}
 
-	if (gensec_krb5_state->context) {
-		krb5_free_context(gensec_krb5_state->context);
-	}
 	return 0;
 }
 
@@ -267,7 +264,6 @@ static NTSTATUS gensec_krb5_start(struct gensec_security *gensec_security)
 	gensec_security->private_data = gensec_krb5_state;
 
 	initialize_krb5_error_table();
-	gensec_krb5_state->context = NULL;
 	gensec_krb5_state->auth_context = NULL;
 	gensec_krb5_state->ccache = NULL;
 	ZERO_STRUCT(gensec_krb5_state->ticket);
@@ -277,32 +273,18 @@ static NTSTATUS gensec_krb5_start(struct gensec_security *gensec_security)
 
 	talloc_set_destructor(gensec_krb5_state, gensec_krb5_destory); 
 
-	ret = krb5_init_context(&gensec_krb5_state->context);
+	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;
 	}
 
-	if (lp_realm() && *lp_realm()) {
-		char *upper_realm = strupper_talloc(gensec_krb5_state, lp_realm());
-		if (!upper_realm) {
-			DEBUG(1,("gensec_krb5_start: could not uppercase realm: %s\n", lp_realm()));
-			return NT_STATUS_NO_MEMORY;
-		}
-		ret = krb5_set_default_realm(gensec_krb5_state->context, upper_realm);
-		if (ret) {
-			DEBUG(1,("gensec_krb5_start: krb5_set_default_realm failed (%s)\n", 
-				 smb_get_krb5_error_message(gensec_krb5_state->context, 
-							    ret, gensec_krb5_state)));
-			return NT_STATUS_INTERNAL_ERROR;
-		}
-	}
-
-	ret = krb5_auth_con_init(gensec_krb5_state->context, &gensec_krb5_state->auth_context);
+	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->context, 
+			 smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, 
 						    ret, gensec_krb5_state)));
 		return NT_STATUS_INTERNAL_ERROR;
 	}
@@ -351,10 +333,10 @@ static NTSTATUS gensec_krb5_client_start(struct gensec_security *gensec_security
 	 
 	   TODO: If the user set a username, we should use an in-memory CCACHE (see below)
 	*/ 
-	ret = krb5_cc_default(gensec_krb5_state->context, &gensec_krb5_state->ccache);
+	ret = krb5_cc_default(gensec_krb5_state->smb_krb5_context->krb5_context, &gensec_krb5_state->ccache);
 	if (ret) {
 		DEBUG(1,("krb5_cc_default failed (%s)\n",
-			 smb_get_krb5_error_message(gensec_krb5_state->context, ret, gensec_krb5_state)));
+			 smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
 		return NT_STATUS_INTERNAL_ERROR;
 	}
 	
@@ -363,7 +345,7 @@ static NTSTATUS gensec_krb5_client_start(struct gensec_security *gensec_security
 			krb5_data in_data;
 			in_data.length = 0;
 
-			ret = krb5_mk_req(gensec_krb5_state->context, 
+			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),
@@ -377,7 +359,7 @@ static NTSTATUS gensec_krb5_client_start(struct gensec_security *gensec_security
 			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->context, ret, gensec_krb5_state)));
+				  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:
@@ -387,7 +369,7 @@ static NTSTATUS gensec_krb5_client_start(struct gensec_security *gensec_security
 		case KRB5_KDCREP_SKEW:
 		{
 			DEBUG(3, ("kerberos (mk_req) failed: %s\n", 
-				  smb_get_krb5_error_message(gensec_krb5_state->context, ret, gensec_krb5_state)));
+				  smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
 			/* fall down to remaining code */
 		}
 
@@ -399,7 +381,7 @@ static NTSTATUS gensec_krb5_client_start(struct gensec_security *gensec_security
 			
 		nt_status = kinit_to_ccache(gensec_krb5_state,  
 					    gensec_security->credentials,
-					    gensec_krb5_state->context, 
+					    gensec_krb5_state->smb_krb5_context, 
 					    &gensec_krb5_state->ccache, 
 					    &ccache_name);
 		
@@ -410,7 +392,7 @@ static NTSTATUS gensec_krb5_client_start(struct gensec_security *gensec_security
 
 		default:
 			DEBUG(0, ("kerberos: %s\n", 
-				  smb_get_krb5_error_message(gensec_krb5_state->context, ret, gensec_krb5_state)));
+				  smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
 			return NT_STATUS_UNSUCCESSFUL;
 		}
 	}
@@ -442,7 +424,7 @@ static NTSTATUS gensec_krb5_update(struct gensec_security *gensec_security,
 	{
 		if (ret) {
 			DEBUG(1,("ads_krb5_mk_req (request ticket) failed (%s)\n",
-				 smb_get_krb5_error_message(gensec_krb5_state->context, ret, out_mem_ctx)));
+				 smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, out_mem_ctx)));
 			nt_status = NT_STATUS_LOGON_FAILURE;
 		} else {
 			DATA_BLOB unwrapped_out;
@@ -478,12 +460,12 @@ static NTSTATUS gensec_krb5_update(struct gensec_security *gensec_security,
 
 		inbuf.data = unwrapped_in.data;
 		inbuf.length = unwrapped_in.length;
-		ret = krb5_rd_rep(gensec_krb5_state->context, 
+		ret = krb5_rd_rep(gensec_krb5_state->smb_krb5_context->krb5_context, 
 				  gensec_krb5_state->auth_context,
 				  &inbuf, &repl);
 		if (ret) {
 			DEBUG(1,("krb5_rd_rep (mutual authentication) failed (%s)\n",
-				 smb_get_krb5_error_message(gensec_krb5_state->context, ret, out_mem_ctx)));
+				 smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, out_mem_ctx)));
 			dump_data_pw("Mutual authentication message:\n", inbuf.data, inbuf.length);
 			nt_status = NT_STATUS_ACCESS_DENIED;
 		} else {
@@ -492,7 +474,7 @@ static NTSTATUS gensec_krb5_update(struct gensec_security *gensec_security,
 			gensec_krb5_state->state_position = GENSEC_KRB5_DONE;
 		}
 		if (repl) {
-			krb5_free_ap_rep_enc_part(gensec_krb5_state->context, repl);
+			krb5_free_ap_rep_enc_part(gensec_krb5_state->smb_krb5_context->krb5_context, repl);
 		}
 		return nt_status;
 	}
@@ -512,7 +494,7 @@ static NTSTATUS gensec_krb5_update(struct gensec_security *gensec_security,
 		/* Parse the GSSAPI wrapping, if it's there... (win2k3 allows it to be omited) */
 		if (!gensec_gssapi_parse_krb5_wrap(out_mem_ctx, &in, &unwrapped_in, tok_id)) {
 			nt_status = ads_verify_ticket(out_mem_ctx, 
-						      gensec_krb5_state->context, 
+						      gensec_krb5_state->smb_krb5_context->krb5_context, 
 						      gensec_krb5_state->auth_context, 
 						      lp_realm(), 
 						      gensec_get_target_service(gensec_security), &in, 
@@ -521,7 +503,7 @@ static NTSTATUS gensec_krb5_update(struct gensec_security *gensec_security,
 		} else {
 			/* TODO: check the tok_id */
 			nt_status = ads_verify_ticket(out_mem_ctx, 
-						      gensec_krb5_state->context, 
+						      gensec_krb5_state->smb_krb5_context->krb5_context, 
 						      gensec_krb5_state->auth_context, 
 						      lp_realm(), 
 						      gensec_get_target_service(gensec_security), 
@@ -558,10 +540,10 @@ static NTSTATUS gensec_krb5_update(struct gensec_security *gensec_security,
 }
 
 static NTSTATUS gensec_krb5_session_key(struct gensec_security *gensec_security, 
-					   DATA_BLOB *session_key) 
+					DATA_BLOB *session_key) 
 {
 	struct gensec_krb5_state *gensec_krb5_state = gensec_security->private_data;
-	krb5_context context = gensec_krb5_state->context;
+	krb5_context context = gensec_krb5_state->smb_krb5_context->krb5_context;
 	krb5_auth_context auth_context = gensec_krb5_state->auth_context;
 	krb5_keyblock *skey;
 	krb5_error_code err;