diff options
Diffstat (limited to 'source4/heimdal/lib/gssapi/krb5/acquire_cred.c')
| -rw-r--r-- | source4/heimdal/lib/gssapi/krb5/acquire_cred.c | 403 |
1 files changed, 403 insertions, 0 deletions
diff --git a/source4/heimdal/lib/gssapi/krb5/acquire_cred.c b/source4/heimdal/lib/gssapi/krb5/acquire_cred.c new file mode 100644 index 0000000000..a7caf1a32e --- /dev/null +++ b/source4/heimdal/lib/gssapi/krb5/acquire_cred.c @@ -0,0 +1,403 @@ +/* + * Copyright (c) 1997 - 2005 Kungliga Tekniska Högskolan + * (Royal Institute of Technology, Stockholm, Sweden). + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * 3. Neither the name of the Institute nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include "krb5/gsskrb5_locl.h" + +RCSID("$Id$"); + +OM_uint32 +__gsskrb5_ccache_lifetime(OM_uint32 *minor_status, + krb5_context context, + krb5_ccache id, + krb5_principal principal, + OM_uint32 *lifetime) +{ + krb5_creds in_cred, *out_cred; + krb5_const_realm realm; + krb5_error_code kret; + + memset(&in_cred, 0, sizeof(in_cred)); + in_cred.client = principal; + + realm = krb5_principal_get_realm(context, principal); + if (realm == NULL) { + _gsskrb5_clear_status (); + *minor_status = KRB5_PRINC_NOMATCH; /* XXX */ + return GSS_S_FAILURE; + } + + kret = krb5_make_principal(context, &in_cred.server, + realm, KRB5_TGS_NAME, realm, NULL); + if (kret) { + *minor_status = kret; + return GSS_S_FAILURE; + } + + kret = krb5_get_credentials(context, 0, + id, &in_cred, &out_cred); + krb5_free_principal(context, in_cred.server); + if (kret) { + *minor_status = kret; + return GSS_S_FAILURE; + } + + *lifetime = out_cred->times.endtime; + krb5_free_creds(context, out_cred); + + return GSS_S_COMPLETE; +} + + + + +static krb5_error_code +get_keytab(krb5_context context, krb5_keytab *keytab) +{ + char kt_name[256]; + krb5_error_code kret; + + HEIMDAL_MUTEX_lock(&gssapi_keytab_mutex); + + if (_gsskrb5_keytab != NULL) { + kret = krb5_kt_get_name(context, + _gsskrb5_keytab, + kt_name, sizeof(kt_name)); + if (kret == 0) + kret = krb5_kt_resolve(context, kt_name, keytab); + } else + kret = krb5_kt_default(context, keytab); + + HEIMDAL_MUTEX_unlock(&gssapi_keytab_mutex); + + return (kret); +} + +static OM_uint32 acquire_initiator_cred + (OM_uint32 * minor_status, + krb5_context context, + const gss_name_t desired_name, + OM_uint32 time_req, + const gss_OID_set desired_mechs, + gss_cred_usage_t cred_usage, + gsskrb5_cred handle, + gss_OID_set * actual_mechs, + OM_uint32 * time_rec + ) +{ + OM_uint32 ret; + krb5_creds cred; + krb5_principal def_princ; + krb5_get_init_creds_opt *opt; + krb5_ccache ccache; + krb5_keytab keytab; + krb5_error_code kret; + + keytab = NULL; + ccache = NULL; + def_princ = NULL; + ret = GSS_S_FAILURE; + memset(&cred, 0, sizeof(cred)); + + /* + * If we have a preferred principal, lets try to find it in all + * caches, otherwise, fall back to default cache, ignore all + * errors while searching. + */ + + if (handle->principal) { + kret = krb5_cc_cache_match (context, + handle->principal, + NULL, + &ccache); + if (kret == 0) { + ret = GSS_S_COMPLETE; + goto found; + } + } + + if (ccache == NULL) { + kret = krb5_cc_default(context, &ccache); + if (kret) + goto end; + } + kret = krb5_cc_get_principal(context, ccache, &def_princ); + if (kret != 0) { + /* we'll try to use a keytab below */ + krb5_cc_close(context, ccache); + def_princ = NULL; + kret = 0; + } else if (handle->principal == NULL) { + kret = krb5_copy_principal(context, def_princ, &handle->principal); + if (kret) + goto end; + } else if (handle->principal != NULL && + krb5_principal_compare(context, handle->principal, + def_princ) == FALSE) { + krb5_free_principal(context, def_princ); + def_princ = NULL; + krb5_cc_close(context, ccache); + ccache = NULL; + } + if (def_princ == NULL) { + /* We have no existing credentials cache, + * so attempt to get a TGT using a keytab. + */ + if (handle->principal == NULL) { + kret = krb5_get_default_principal(context, &handle->principal); + if (kret) + goto end; + } + kret = get_keytab(context, &keytab); + if (kret) + goto end; + kret = krb5_get_init_creds_opt_alloc(context, &opt); + if (kret) + goto end; + kret = krb5_get_init_creds_keytab(context, &cred, + handle->principal, keytab, 0, NULL, opt); + krb5_get_init_creds_opt_free(context, opt); + if (kret) + goto end; + kret = krb5_cc_gen_new(context, &krb5_mcc_ops, &ccache); + if (kret) + goto end; + kret = krb5_cc_initialize(context, ccache, cred.client); + if (kret) { + krb5_cc_destroy(context, ccache); + goto end; + } + kret = krb5_cc_store_cred(context, ccache, &cred); + if (kret) { + krb5_cc_destroy(context, ccache); + goto end; + } + handle->lifetime = cred.times.endtime; + handle->cred_flags |= GSS_CF_DESTROY_CRED_ON_RELEASE; + } else { + + ret = __gsskrb5_ccache_lifetime(minor_status, + context, + ccache, + handle->principal, + &handle->lifetime); + if (ret != GSS_S_COMPLETE) { + krb5_cc_close(context, ccache); + goto end; + } + kret = 0; + } + found: + handle->ccache = ccache; + ret = GSS_S_COMPLETE; + +end: + if (cred.client != NULL) + krb5_free_cred_contents(context, &cred); + if (def_princ != NULL) + krb5_free_principal(context, def_princ); + if (keytab != NULL) + krb5_kt_close(context, keytab); + if (ret != GSS_S_COMPLETE && kret != 0) + *minor_status = kret; + return (ret); +} + +static OM_uint32 acquire_acceptor_cred + (OM_uint32 * minor_status, + krb5_context context, + const gss_name_t desired_name, + OM_uint32 time_req, + const gss_OID_set desired_mechs, + gss_cred_usage_t cred_usage, + gsskrb5_cred handle, + gss_OID_set * actual_mechs, + OM_uint32 * time_rec + ) +{ + OM_uint32 ret; + krb5_error_code kret; + + ret = GSS_S_FAILURE; + kret = get_keytab(context, &handle->keytab); + if (kret) + goto end; + + /* check that the requested principal exists in the keytab */ + if (handle->principal) { + krb5_keytab_entry entry; + + kret = krb5_kt_get_entry(context, handle->keytab, + handle->principal, 0, 0, &entry); + if (kret) + goto end; + krb5_kt_free_entry(context, &entry); + ret = GSS_S_COMPLETE; + } else { + /* + * Check if there is at least one entry in the keytab before + * declaring it as an useful keytab. + */ + krb5_keytab_entry tmp; + krb5_kt_cursor c; + + kret = krb5_kt_start_seq_get (context, handle->keytab, &c); + if (kret) + goto end; + if (krb5_kt_next_entry(context, handle->keytab, &tmp, &c) == 0) { + krb5_kt_free_entry(context, &tmp); + ret = GSS_S_COMPLETE; /* ok found one entry */ + } + krb5_kt_end_seq_get (context, handle->keytab, &c); + } +end: + if (ret != GSS_S_COMPLETE) { + if (handle->keytab != NULL) + krb5_kt_close(context, handle->keytab); + if (kret != 0) { + *minor_status = kret; + } + } + return (ret); +} + +OM_uint32 _gsskrb5_acquire_cred +(OM_uint32 * minor_status, + const gss_name_t desired_name, + OM_uint32 time_req, + const gss_OID_set desired_mechs, + gss_cred_usage_t cred_usage, + gss_cred_id_t * output_cred_handle, + gss_OID_set * actual_mechs, + OM_uint32 * time_rec + ) +{ + krb5_context context; + gsskrb5_cred handle; + OM_uint32 ret; + + if (cred_usage != GSS_C_ACCEPT && cred_usage != GSS_C_INITIATE && cred_usage != GSS_C_BOTH) { + *minor_status = GSS_KRB5_S_G_BAD_USAGE; + return GSS_S_FAILURE; + } + + GSSAPI_KRB5_INIT(&context); + + *output_cred_handle = NULL; + if (time_rec) + *time_rec = 0; + if (actual_mechs) + *actual_mechs = GSS_C_NO_OID_SET; + + if (desired_mechs) { + int present = 0; + + ret = gss_test_oid_set_member(minor_status, GSS_KRB5_MECHANISM, + desired_mechs, &present); + if (ret) + return ret; + if (!present) { + *minor_status = 0; + return GSS_S_BAD_MECH; + } + } + + handle = calloc(1, sizeof(*handle)); + if (handle == NULL) { + *minor_status = ENOMEM; + return (GSS_S_FAILURE); + } + + HEIMDAL_MUTEX_init(&handle->cred_id_mutex); + + if (desired_name != GSS_C_NO_NAME) { + + ret = _gsskrb5_canon_name(minor_status, context, 0, desired_name, + &handle->principal); + if (ret) { + HEIMDAL_MUTEX_destroy(&handle->cred_id_mutex); + free(handle); + return ret; + } + } + if (cred_usage == GSS_C_INITIATE || cred_usage == GSS_C_BOTH) { + ret = acquire_initiator_cred(minor_status, context, + desired_name, time_req, + desired_mechs, cred_usage, handle, + actual_mechs, time_rec); + if (ret != GSS_S_COMPLETE) { + HEIMDAL_MUTEX_destroy(&handle->cred_id_mutex); + krb5_free_principal(context, handle->principal); + free(handle); + return (ret); + } + } + if (cred_usage == GSS_C_ACCEPT || cred_usage == GSS_C_BOTH) { + ret = acquire_acceptor_cred(minor_status, context, + desired_name, time_req, + desired_mechs, cred_usage, handle, actual_mechs, time_rec); + if (ret != GSS_S_COMPLETE) { + HEIMDAL_MUTEX_destroy(&handle->cred_id_mutex); + krb5_free_principal(context, handle->principal); + free(handle); + return (ret); + } + } + ret = gss_create_empty_oid_set(minor_status, &handle->mechanisms); + if (ret == GSS_S_COMPLETE) + ret = gss_add_oid_set_member(minor_status, GSS_KRB5_MECHANISM, + &handle->mechanisms); + if (ret == GSS_S_COMPLETE) + ret = _gsskrb5_inquire_cred(minor_status, (gss_cred_id_t)handle, + NULL, time_rec, NULL, actual_mechs); + if (ret != GSS_S_COMPLETE) { + if (handle->mechanisms != NULL) + gss_release_oid_set(NULL, &handle->mechanisms); + HEIMDAL_MUTEX_destroy(&handle->cred_id_mutex); + krb5_free_principal(context, handle->principal); + free(handle); + return (ret); + } + *minor_status = 0; + if (time_rec) { + ret = _gsskrb5_lifetime_left(minor_status, + context, + handle->lifetime, + time_rec); + + if (ret) + return ret; + } + handle->usage = cred_usage; + *output_cred_handle = (gss_cred_id_t)handle; + return (GSS_S_COMPLETE); +} |