diff options
Diffstat (limited to 'src/tests/gssapi/t_s4u.c')
| -rw-r--r-- | src/tests/gssapi/t_s4u.c | 418 |
1 files changed, 418 insertions, 0 deletions
diff --git a/src/tests/gssapi/t_s4u.c b/src/tests/gssapi/t_s4u.c new file mode 100644 index 0000000..264e60a --- /dev/null +++ b/src/tests/gssapi/t_s4u.c @@ -0,0 +1,418 @@ +/* -*- mode: c; indent-tabs-mode: nil -*- */ +/* + * Copyright 2009 by the Massachusetts Institute of Technology. + * All Rights Reserved. + * + * Export of this software from the United States of America may + * require a specific license from the United States Government. + * It is the responsibility of any person or organization contemplating + * export to obtain such a license before exporting. + * + * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and + * distribute this software and its documentation for any purpose and + * without fee is hereby granted, provided that the above copyright + * notice appear in all copies and that both that copyright notice and + * this permission notice appear in supporting documentation, and that + * the name of M.I.T. not be used in advertising or publicity pertaining + * to distribution of the software without specific, written prior + * permission. Furthermore if you modify this software you must label + * your software as modified software and not distribute it in such a + * fashion that it might be confused with the original M.I.T. software. + * M.I.T. makes no representations about the suitability of + * this software for any purpose. It is provided "as is" without express + * or implied warranty. + * + */ + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#include <gssapi/gssapi_krb5.h> + +/* + * Test program for protocol transition (S4U2Self) and constrained delegation + * (S4U2Proxy) + * + * Note: because of name canonicalization, the following tips may help + * when configuring with Active Directory: + * + * - Create a computer account FOO$ + * - Set the UPN to host/foo.domain (no suffix); this is necessary to + * be able to send an AS-REQ as this principal, otherwise you would + * need to use the canonical name (FOO$), which will cause principal + * comparison errors in gss_accept_sec_context(). + * - Add a SPN of host/foo.domain + * - Configure the computer account to support constrained delegation with + * protocol transition (Trust this computer for delegation to specified + * services only / Use any authentication protocol) + * - Add host/foo.domain to the keytab (possibly easiest to do this + * with ktadd) + * + * For S4U2Proxy to work the TGT must be forwardable too. + * + * Usage eg: + * + * kinit -k -t test.keytab -f 'host/test.win.mit.edu@WIN.MIT.EDU' + * ./t_s4u delegtest@WIN.MIT.EDU HOST/WIN-EQ7E4AA2WR8.win.mit.edu@WIN.MIT.EDU test.keytab + */ + +static gss_OID_desc spnego_mech = { 6, "\053\006\001\005\005\002" }; + +int use_spnego = 0; + +static void displayStatus_1(m, code, type) + char *m; + OM_uint32 code; + int type; +{ + OM_uint32 maj_stat, min_stat; + gss_buffer_desc msg; + OM_uint32 msg_ctx; + + msg_ctx = 0; + while (1) { + maj_stat = gss_display_status(&min_stat, code, + type, GSS_C_NULL_OID, + &msg_ctx, &msg); + fprintf(stderr, "%s: %s\n", m, (char *)msg.value); + (void) gss_release_buffer(&min_stat, &msg); + + if (!msg_ctx) + break; + } +} + +static void displayStatus(msg, maj_stat, min_stat) + char *msg; + OM_uint32 maj_stat; + OM_uint32 min_stat; +{ + displayStatus_1(msg, maj_stat, GSS_C_GSS_CODE); + displayStatus_1(msg, min_stat, GSS_C_MECH_CODE); +} + +static OM_uint32 +displayCanonName(OM_uint32 *minor, gss_name_t name, char *tag) +{ + gss_name_t canon; + OM_uint32 major, tmp_minor; + gss_buffer_desc buf; + + major = gss_canonicalize_name(minor, name, + (gss_OID)gss_mech_krb5, &canon); + if (GSS_ERROR(major)) { + displayStatus("gss_canonicalize_name", major, *minor); + return major; + } + + major = gss_display_name(minor, canon, &buf, NULL); + if (GSS_ERROR(major)) { + displayStatus("gss_display_name", major, *minor); + gss_release_name(&tmp_minor, &canon); + return major; + } + + printf("%s:\t%s\n", tag, (char *)buf.value); + + gss_release_buffer(&tmp_minor, &buf); + gss_release_name(&tmp_minor, &canon); + + return GSS_S_COMPLETE; +} + +static OM_uint32 +displayOID(OM_uint32 *minor, gss_OID oid, char *tag) +{ + OM_uint32 major, tmp_minor; + gss_buffer_desc buf; + + major = gss_oid_to_str(minor, oid, &buf); + if (GSS_ERROR(major)) { + displayStatus("gss_oid_to_str", major, *minor); + return major; + } + + printf("%s:\t%s\n", tag, (char *)buf.value); + + gss_release_buffer(&tmp_minor, &buf); + + return GSS_S_COMPLETE; +} + +static OM_uint32 +initAcceptSecContext(OM_uint32 *minor, + gss_cred_id_t claimant_cred_handle, + gss_cred_id_t verifier_cred_handle, + gss_cred_id_t *deleg_cred_handle) +{ + OM_uint32 major, tmp_minor; + gss_buffer_desc token, tmp; + gss_ctx_id_t initiator_context = GSS_C_NO_CONTEXT; + gss_ctx_id_t acceptor_context = GSS_C_NO_CONTEXT; + gss_name_t source_name = GSS_C_NO_NAME; + gss_name_t target_name = GSS_C_NO_NAME; + OM_uint32 time_rec; + gss_OID mech = GSS_C_NO_OID; + + token.value = NULL; + token.length = 0; + + tmp.value = NULL; + tmp.length = 0; + + *deleg_cred_handle = GSS_C_NO_CREDENTIAL; + + major = gss_inquire_cred(minor, verifier_cred_handle, + &target_name, NULL, NULL, NULL); + if (GSS_ERROR(major)) { + displayStatus("gss_inquire_cred", major, *minor); + return major; + } + + displayCanonName(minor, target_name, "Target name"); + + mech = use_spnego ? (gss_OID)&spnego_mech : (gss_OID)gss_mech_krb5; + displayOID(minor, mech, "Target mech"); + + major = gss_init_sec_context(minor, + claimant_cred_handle, + &initiator_context, + target_name, + mech, + GSS_C_REPLAY_FLAG | GSS_C_SEQUENCE_FLAG, + GSS_C_INDEFINITE, + GSS_C_NO_CHANNEL_BINDINGS, + GSS_C_NO_BUFFER, + NULL, + &token, + NULL, + &time_rec); + + if (target_name != GSS_C_NO_NAME) + (void) gss_release_name(&tmp_minor, &target_name); + + if (GSS_ERROR(major)) { + displayStatus("gss_init_sec_context", major, *minor); + return major; + } + + (void) gss_delete_sec_context(minor, &initiator_context, NULL); + mech = GSS_C_NO_OID; + + major = gss_accept_sec_context(minor, + &acceptor_context, + verifier_cred_handle, + &token, + GSS_C_NO_CHANNEL_BINDINGS, + &source_name, + &mech, + &tmp, + NULL, + &time_rec, + deleg_cred_handle); + + if (GSS_ERROR(major)) + displayStatus("gss_accept_sec_context", major, *minor); + else { + displayCanonName(minor, source_name, "Source name"); + displayOID(minor, mech, "Source mech"); + } + + (void) gss_release_name(&tmp_minor, &source_name); + (void) gss_delete_sec_context(&tmp_minor, &acceptor_context, NULL); + (void) gss_release_buffer(&tmp_minor, &token); + (void) gss_release_buffer(&tmp_minor, &tmp); + (void) gss_release_oid(&tmp_minor, &mech); + + return major; +} + +static OM_uint32 +constrainedDelegate(OM_uint32 *minor, + gss_OID_set desired_mechs, + gss_name_t target, + gss_cred_id_t delegated_cred_handle, + gss_cred_id_t verifier_cred_handle) +{ + OM_uint32 major, tmp_minor; + gss_ctx_id_t initiator_context = GSS_C_NO_CONTEXT; + gss_name_t cred_name = GSS_C_NO_NAME; + OM_uint32 time_rec, lifetime; + gss_cred_usage_t usage; + gss_buffer_desc token; + gss_OID_set mechs; + + printf("Constrained delegation tests follow\n"); + printf("-----------------------------------\n\n"); + + if (gss_inquire_cred(minor, verifier_cred_handle, &cred_name, + &lifetime, &usage, NULL) == GSS_S_COMPLETE) { + displayCanonName(minor, cred_name, "Proxy name"); + gss_release_name(&tmp_minor, &cred_name); + } + displayCanonName(minor, target, "Target name"); + if (gss_inquire_cred(minor, delegated_cred_handle, &cred_name, + &lifetime, &usage, &mechs) == GSS_S_COMPLETE) { + displayCanonName(minor, cred_name, "Delegated name"); + displayOID(minor, &mechs->elements[0], "Delegated mech"); + gss_release_name(&tmp_minor, &cred_name); + } + + printf("\n"); + + major = gss_init_sec_context(minor, + delegated_cred_handle, + &initiator_context, + target, + mechs ? &mechs->elements[0] : + (gss_OID)gss_mech_krb5, + GSS_C_REPLAY_FLAG | GSS_C_SEQUENCE_FLAG, + GSS_C_INDEFINITE, + GSS_C_NO_CHANNEL_BINDINGS, + GSS_C_NO_BUFFER, + NULL, + &token, + NULL, + &time_rec); + if (GSS_ERROR(major)) + displayStatus("gss_init_sec_context", major, *minor); + + (void) gss_release_buffer(&tmp_minor, &token); + (void) gss_delete_sec_context(&tmp_minor, &initiator_context, NULL); + (void) gss_release_oid_set(&tmp_minor, &mechs); + + return major; +} + +int main(int argc, char *argv[]) +{ + OM_uint32 minor, major; + gss_cred_id_t impersonator_cred_handle = GSS_C_NO_CREDENTIAL; + gss_cred_id_t user_cred_handle = GSS_C_NO_CREDENTIAL; + gss_cred_id_t delegated_cred_handle = GSS_C_NO_CREDENTIAL; + gss_name_t user = GSS_C_NO_NAME, target = GSS_C_NO_NAME; + gss_OID_set_desc mechs; + gss_OID_set actual_mechs = GSS_C_NO_OID_SET; + gss_buffer_desc buf; + + if (argc < 2 || argc > 5) { + fprintf(stderr, "Usage: %s [--spnego] [user] " + "[proxy-target] [keytab]\n", argv[0]); + fprintf(stderr, " proxy-target and keytab are optional\n"); + exit(1); + } + + if (strcmp(argv[1], "--spnego") == 0) { + use_spnego++; + argc--; + argv++; + } + + buf.value = argv[1]; + buf.length = strlen((char *)buf.value); + + major = gss_import_name(&minor, &buf, + (gss_OID)GSS_KRB5_NT_PRINCIPAL_NAME, + &user); + if (GSS_ERROR(major)) { + displayStatus("gss_import_name(user)", major, minor); + goto out; + } + + if (argc > 2 && strcmp(argv[2], "-")) { + buf.value = argv[2]; + buf.length = strlen((char *)buf.value); + + major = gss_import_name(&minor, &buf, + (gss_OID)GSS_KRB5_NT_PRINCIPAL_NAME, + &target); + if (GSS_ERROR(major)) { + displayStatus("gss_import_name(target)", major, minor); + goto out; + } + } else { + target = GSS_C_NO_NAME; + } + + if (argc > 3) { + major = krb5_gss_register_acceptor_identity(argv[3]); + if (GSS_ERROR(major)) { + displayStatus("krb5_gss_register_acceptor_identity", + major, minor); + goto out; + } + } + + mechs.elements = use_spnego ? (gss_OID)&spnego_mech : + (gss_OID)gss_mech_krb5; + mechs.count = 1; + + /* get default cred */ + major = gss_acquire_cred(&minor, + GSS_C_NO_NAME, + GSS_C_INDEFINITE, + &mechs, + GSS_C_BOTH, + &impersonator_cred_handle, + &actual_mechs, + NULL); + if (GSS_ERROR(major)) { + displayStatus("gss_acquire_cred", major, minor); + goto out; + } + + (void) gss_release_oid_set(&minor, &actual_mechs); + + printf("Protocol transition tests follow\n"); + printf("-----------------------------------\n\n"); + + /* get S4U2Self cred */ + major = gss_acquire_cred_impersonate_name(&minor, + impersonator_cred_handle, + user, + GSS_C_INDEFINITE, + &mechs, + GSS_C_INITIATE, + &user_cred_handle, + &actual_mechs, + NULL); + if (GSS_ERROR(major)) { + displayStatus("gss_acquire_cred_impersonate_name", major, minor); + goto out; + } + + major = initAcceptSecContext(&minor, + user_cred_handle, + impersonator_cred_handle, + &delegated_cred_handle); + if (GSS_ERROR(major)) + goto out; + + printf("\n"); + + if (target != GSS_C_NO_NAME && + delegated_cred_handle != GSS_C_NO_CREDENTIAL) { + major = constrainedDelegate(&minor, &mechs, target, + delegated_cred_handle, + impersonator_cred_handle); + } else if (target != GSS_C_NO_NAME) { + fprintf(stderr, "Warning: no delegated credentials handle returned\n\n"); + fprintf(stderr, "Verify:\n\n"); + fprintf(stderr, " - The TGT for the impersonating service is forwardable\n"); + fprintf(stderr, " - The T2A4D flag set on the impersonating service's UAC\n"); + fprintf(stderr, " - The user is not marked sensitive and cannot be delegated\n"); + fprintf(stderr, "\n"); + } + +out: + (void) gss_release_name(&minor, &user); + (void) gss_release_name(&minor, &target); + (void) gss_release_cred(&minor, &delegated_cred_handle); + (void) gss_release_cred(&minor, &impersonator_cred_handle); + (void) gss_release_cred(&minor, &user_cred_handle); + (void) gss_release_oid_set(&minor, &actual_mechs); + + return GSS_ERROR(major) ? 1 : 0; +} + |