From d160bc733a3dbeb6d84f4e175234ff18738d9f66 Mon Sep 17 00:00:00 2001 From: Simo Sorce Date: Tue, 17 Dec 2013 16:15:14 -0500 Subject: Let SPNEGO display mechanism errors To avoid potential recursion we use a thread local variable that tells us whether the ancestor was called via spnego_gss_display_name(). If we detect recursion, we assume that we returned a com_err code like ENOMEM and call error_message(); in the worst case that will result in an "Unknown error" message. [ghudson@mit.edu: Edited comments and commit message; removed an unneeded line of code.] ticket: 7045 target_version: 1.12.1 tags: pullup --- src/include/k5-thread.h | 1 + src/lib/gssapi/spnego/spnego_mech.c | 42 ++++++++++++++++++++++++++++++------- 2 files changed, 35 insertions(+), 8 deletions(-) diff --git a/src/include/k5-thread.h b/src/include/k5-thread.h index 1b7fa6981d..ab46ec328d 100644 --- a/src/include/k5-thread.h +++ b/src/include/k5-thread.h @@ -406,6 +406,7 @@ typedef enum { K5_KEY_GSS_KRB5_SET_CCACHE_OLD_NAME, K5_KEY_GSS_KRB5_CCACHE_NAME, K5_KEY_GSS_KRB5_ERROR_MESSAGE, + K5_KEY_GSS_SPNEGO_STATUS, #if defined(__MACH__) && defined(__APPLE__) K5_KEY_IPC_CONNECTION_INFO, #endif diff --git a/src/lib/gssapi/spnego/spnego_mech.c b/src/lib/gssapi/spnego/spnego_mech.c index 06cfab00f8..7e4bf901b4 100644 --- a/src/lib/gssapi/spnego/spnego_mech.c +++ b/src/lib/gssapi/spnego/spnego_mech.c @@ -85,8 +85,8 @@ extern int gssint_put_der_length(unsigned int, unsigned char **, unsigned int); /* private routines for spnego_mechanism */ -static spnego_token_t make_spnego_token(char *); -static gss_buffer_desc make_err_msg(char *); +static spnego_token_t make_spnego_token(const char *); +static gss_buffer_desc make_err_msg(const char *); static int g_token_size(gss_OID_const, unsigned int); static int g_make_token_header(gss_OID_const, unsigned int, unsigned char **, unsigned int); @@ -316,6 +316,12 @@ int gss_krb5int_lib_init(void); int gss_spnegoint_lib_init(void) { + int err; + + err = k5_key_register(K5_KEY_GSS_SPNEGO_STATUS, NULL); + if (err) + return err; + #ifdef _GSS_STATIC_LINK return gss_spnegomechglue_init(); #else @@ -1791,7 +1797,6 @@ cleanup: } #endif /* LEAN_CLIENT */ - /*ARGSUSED*/ OM_uint32 KRB5_CALLCONV spnego_gss_display_status( @@ -1802,6 +1807,9 @@ spnego_gss_display_status( OM_uint32 *message_context, gss_buffer_t status_string) { + OM_uint32 maj = GSS_S_COMPLETE; + int ret; + dsyslog("Entering display_status\n"); *message_context = 0; @@ -1832,13 +1840,31 @@ spnego_gss_display_status( "return a valid token")); break; default: - status_string->length = 0; - status_string->value = ""; + /* Not one of our minor codes; might be from a mech. Call back + * to gss_display_status, but first check for recursion. */ + if (k5_getspecific(K5_KEY_GSS_SPNEGO_STATUS) != NULL) { + /* Perhaps we returned a com_err code like ENOMEM. */ + const char *err = error_message(status_value); + *status_string = make_err_msg(err); + break; + } + /* Set a non-null pointer value; doesn't matter which one. */ + ret = k5_setspecific(K5_KEY_GSS_SPNEGO_STATUS, &ret); + if (ret != 0) { + *minor_status = ret; + maj = GSS_S_FAILURE; + break; + } + maj = gss_display_status(minor_status, status_value, + status_type, mech_type, + message_context, status_string); + /* This is unlikely to fail; not much we can do if it does. */ + (void)k5_setspecific(K5_KEY_GSS_SPNEGO_STATUS, NULL); break; } dsyslog("Leaving display_status\n"); - return (GSS_S_COMPLETE); + return maj; } @@ -3550,13 +3576,13 @@ negotiate_mech(gss_OID_set supported, gss_OID_set received, * these routines will be changes to return the error string. */ static spnego_token_t -make_spnego_token(char *name) +make_spnego_token(const char *name) { return (spnego_token_t)strdup(name); } static gss_buffer_desc -make_err_msg(char *name) +make_err_msg(const char *name) { gss_buffer_desc buffer; -- cgit