/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
+/* lib/krb5/krb/fast.c */
/*
- * lib/krb5/krb/fast.c
- *
* Copyright (C) 2009 by the Massachusetts Institute of Technology.
* All rights reserved.
*
* 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 <k5-int.h>
/*
- * It is possible to support sending a request that includes both a
- * FAST and normal version. This would complicate the
- * pre-authentication logic significantly. You would need to maintain
- * two contexts, one for FAST and one for normal use. In adition, you
- * would need to manage the security issues surrounding downgrades.
- * However trying FAST at all requires an armor key. Generally in
- * obtaining the armor key, the client learns enough to know that FAST
- * is supported. If not, the client can see FAST in the
+ * It is possible to support sending a request that includes both a FAST and
+ * normal version. This would complicate the pre-authentication logic
+ * significantly. You would need to maintain two contexts, one for FAST and
+ * one for normal use. In adition, you would need to manage the security
+ * issues surrounding downgrades. However trying FAST at all requires an armor
+ * key. Generally in obtaining the armor key, the client learns enough to know
+ * that FAST is supported. If not, the client can see FAST in the
* preauth_required error's padata and retry with FAST. So, this
* implementation does not support FAST+normal.
*
- * We store the outer version of the request to use . The caller
- * stores the inner version. We handle the encoding of the request
- * body (and request) and provide encoded request bodies for the
- * caller to use as these may be used for checksums. In the AS case
- * we also evaluate whether to continue a conversation as one of the
- * important questions there is the presence of a cookie.
+ * We store the outer version of the request to use. The caller stores the
+ * inner version. We handle the encoding of the request body (and request) and
+ * provide encoded request bodies for the caller to use as these may be used
+ * for checksums. In the AS case we also evaluate whether to continue a
+ * conversation as one of the important questions there is the presence of a
+ * cookie.
*/
#include "fast.h"
#include "int-proto.h"
-
static krb5_error_code
fast_armor_ap_request(krb5_context context,
struct krb5int_fast_request_state *state,
krb5_data encoded_authenticator;
krb5_fast_armor *armor = NULL;
krb5_keyblock *subkey = NULL, *armor_key = NULL;
+
encoded_authenticator.data = NULL;
memset(&creds, 0, sizeof(creds));
creds.server = target_principal;
retval = krb5_cc_get_principal(context, ccache, &creds.client);
if (retval == 0)
retval = krb5_get_credentials(context, 0, ccache, &creds, &out_creds);
- if (retval == 0)
- retval = krb5_mk_req_extended(context, &authcontext, AP_OPTS_USE_SUBKEY, NULL /*data*/,
+ if (retval == 0) {
+ TRACE_FAST_ARMOR_CCACHE_KEY(context, &out_creds->keyblock);
+ retval = krb5_mk_req_extended(context, &authcontext,
+ AP_OPTS_USE_SUBKEY, NULL /*data*/,
out_creds, &encoded_authenticator);
+ }
if (retval == 0)
retval = krb5_auth_con_getsendsubkey(context, authcontext, &subkey);
if (retval == 0)
retval = krb5_c_fx_cf2_simple(context, subkey, "subkeyarmor",
- &out_creds->keyblock, "ticketarmor", &armor_key);
+ &out_creds->keyblock, "ticketarmor",
+ &armor_key);
if (retval == 0) {
+ TRACE_FAST_ARMOR_KEY(context, armor_key);
armor = calloc(1, sizeof(krb5_fast_armor));
if (armor == NULL)
retval = ENOMEM;
}
krb5_error_code
-krb5int_fast_prep_req_body(krb5_context context, struct krb5int_fast_request_state *state,
- krb5_kdc_req *request, krb5_data **encoded_request_body)
+krb5int_fast_prep_req_body(krb5_context context,
+ struct krb5int_fast_request_state *state,
+ krb5_kdc_req *request,
+ krb5_data **encoded_request_body)
{
krb5_error_code retval = 0;
krb5_data *local_encoded_request_body = NULL;
+
assert(state != NULL);
*encoded_request_body = NULL;
- if (state->armor_key == NULL) {
- return encode_krb5_kdc_req_body(request, encoded_request_body);
- }
+ if (state->armor_key == NULL)
+ return encode_krb5_kdc_req_body(request, encoded_request_body);
state->fast_outer_request = *request;
state->fast_outer_request.padata = NULL;
if (retval == 0)
krb5_ccache ccache = NULL;
krb5_principal target_principal = NULL;
krb5_data *target_realm;
+
krb5_clear_error_message(context);
target_realm = krb5_princ_realm(context, request->server);
if (opte->opt_private->fast_ccache_name) {
+ TRACE_FAST_ARMOR_CCACHE(context, opte->opt_private->fast_ccache_name);
state->fast_state_flags |= KRB5INT_FAST_ARMOR_AVAIL;
retval = krb5_cc_resolve(context, opte->opt_private->fast_ccache_name,
&ccache);
if (retval == 0) {
retval = krb5int_tgtname(context, target_realm, target_realm,
- &target_principal);
+ &target_principal);
}
if (retval == 0) {
krb5_data config_data;
config_data.data = NULL;
retval = krb5_cc_get_config(context, ccache, target_principal,
KRB5_CONF_FAST_AVAIL, &config_data);
- if ((retval == 0) && config_data.data )
+ if ((retval == 0) && config_data.data) {
+ TRACE_FAST_CCACHE_CONFIG(context);
state->fast_state_flags |= KRB5INT_FAST_DO_FAST;
+ }
krb5_free_data_contents(context, &config_data);
retval = 0;
}
- if (opte->opt_private->fast_flags& KRB5_FAST_REQUIRED)
+ if (opte->opt_private->fast_flags & KRB5_FAST_REQUIRED) {
+ TRACE_FAST_REQUIRED(context);
state->fast_state_flags |= KRB5INT_FAST_DO_FAST;
+ }
if (retval == 0 && (state->fast_state_flags & KRB5INT_FAST_DO_FAST)) {
retval = fast_armor_ap_request(context, state, ccache,
target_principal);
if (retval != 0) {
const char * errmsg;
errmsg = krb5_get_error_message(context, retval);
- if (errmsg) {
- krb5_set_error_message(context, retval, "%s constructing AP-REQ armor", errmsg);
- krb5_free_error_message(context, errmsg);
- }
+ krb5_set_error_message(context, retval,
+ _("%s constructing AP-REQ armor"), errmsg);
+ krb5_free_error_message(context, errmsg);
}
}
if (ccache)
krb5_data *encoded_fast_req = NULL;
krb5_data *encoded_armored_req = NULL;
krb5_data *local_encoded_result = NULL;
- krb5_cksumtype cksumtype;
krb5_data random_data;
char random_buf[4];
-
assert(state != NULL);
assert(state->fast_outer_request.padata == NULL);
memset(pa_array, 0, sizeof pa_array);
if (state->armor_key == NULL) {
return encoder(request, encoded_request);
}
-/* Fill in a fresh random nonce for each inner request*/
+
+ TRACE_FAST_ENCODE(context);
+ /* Fill in a fresh random nonce for each inner request*/
random_data.length = 4;
random_data.data = (char *)random_buf;
retval = krb5_c_random_make_octets(context, &random_data);
}
if (retval == 0)
armored_req->armor = state->armor;
- if (retval == 0)
- retval = krb5int_c_mandatory_cksumtype(context, state->armor_key->enctype,
- &cksumtype);
- /* DES enctypes have unkeyed mandatory checksums; need a keyed one. */
- if (retval == 0 && !krb5_c_is_keyed_cksum(cksumtype))
- cksumtype = CKSUMTYPE_RSA_MD5_DES;
if (retval ==0)
- retval = krb5_c_make_checksum(context, cksumtype, state->armor_key,
- KRB5_KEYUSAGE_FAST_REQ_CHKSUM, to_be_checksummed,
+ retval = krb5_c_make_checksum(context, 0, state->armor_key,
+ KRB5_KEYUSAGE_FAST_REQ_CHKSUM,
+ to_be_checksummed,
&armored_req->req_checksum);
if (retval == 0)
retval = krb5_encrypt_helper(context, state->armor_key,
KRB5_KEYUSAGE_FAST_ENC, encoded_fast_req,
&armored_req->enc_part);
if (retval == 0)
- retval = encode_krb5_pa_fx_fast_request(armored_req, &encoded_armored_req);
+ retval = encode_krb5_pa_fx_fast_request(armored_req,
+ &encoded_armored_req);
if (retval==0) {
pa[0].pa_type = KRB5_PADATA_FX_FAST;
pa[0].contents = (unsigned char *) encoded_armored_req->data;
krb5_enc_data *encrypted_response = NULL;
krb5_pa_data *fx_reply = NULL;
krb5_fast_response *local_resp = NULL;
+
assert(state != NULL);
assert(state->armor_key);
fx_reply = krb5int_find_pa_data(context, in_padata, KRB5_PADATA_FX_FAST);
if (fx_reply == NULL)
retval = KRB5_ERR_FAST_REQUIRED;
+ TRACE_FAST_DECODE(context);
if (retval == 0) {
scratch.data = (char *) fx_reply->contents;
scratch.length = fx_reply->length;
if (retval != 0) {
const char * errmsg;
errmsg = krb5_get_error_message(context, retval);
- krb5_set_error_message(context, retval, "%s while decrypting FAST reply", errmsg);
+ krb5_set_error_message(context, retval,
+ _("%s while decrypting FAST reply"), errmsg);
krb5_free_error_message(context, errmsg);
}
if (retval == 0)
if (retval == 0) {
if (local_resp->nonce != state->nonce) {
retval = KRB5_KDCREP_MODIFIED;
- krb5_set_error_message(context, retval, "nonce modified in FAST response: KDC response modified");
+ krb5_set_error_message(context, retval,
+ _("nonce modified in FAST response: "
+ "KDC response modified"));
}
}
if (retval == 0) {
}
/*
- * FAST separates two concepts: the set of padata we're using to
- * decide what pre-auth mechanisms to use and the set of padata we're
- * making available to mechanisms in order for them to respond to an
- * error. The plugin interface in March 2009 does not permit
- * separating these concepts for the plugins. This function makes
- * both available for future revisions to the plugin interface. It
- * also re-encodes the padata from the current error as a encoded
- * typed-data and puts that in the e_data field. That will allow
- * existing plugins with the old interface to find the error data.
- * The output parameter out_padata contains the padata from the error
- * whenever padata is available (all the time with fast).
+ * If state contains an armor key and *err_replyptr contains a FAST error,
+ * decode it and set *err_replyptr to the inner error and *out_padata to the
+ * padata in the FAST response. Otherwise, leave *err_replyptr alone and set
+ * *out_padata to the error e_data decoded as pa-data or typed-data, or to NULL
+ * if it doesn't decode as either. In either case, set *retry to indicate
+ * whether the client should try to make a follow-up request.
*/
krb5_error_code
krb5int_fast_process_error(krb5_context context,
{
krb5_error_code retval = 0;
krb5_error *err_reply = *err_replyptr;
+
*out_padata = NULL;
*retry = 0;
if (state->armor_key) {
krb5_pa_data *fx_error_pa;
krb5_pa_data **result = NULL;
- krb5_data scratch, *encoded_td = NULL;
+ krb5_data scratch;
krb5_error *fx_error = NULL;
krb5_fast_response *fast_response = NULL;
+
retval = decode_krb5_padata_sequence(&err_reply->e_data, &result);
if (retval == 0)
- retval = decrypt_fast_reply(context, state, result, &fast_response);
+ retval = decrypt_fast_reply(context, state, result,
+ &fast_response);
if (retval) {
- /*This can happen if the KDC does not understand FAST. We
- * don't expect that, but treating it as the fatal error
- * indicated by the KDC seems reasonable.
+ /*
+ * This can happen if the KDC does not understand FAST. We don't
+ * expect that, but treating it as the fatal error indicated by the
+ * KDC seems reasonable.
*/
*retry = 0;
krb5_free_pa_data(context, result);
krb5_free_pa_data(context, result);
result = NULL;
if (retval == 0) {
- fx_error_pa = krb5int_find_pa_data(context, fast_response->padata, KRB5_PADATA_FX_ERROR);
+ fx_error_pa = krb5int_find_pa_data(context, fast_response->padata,
+ KRB5_PADATA_FX_ERROR);
if (fx_error_pa == NULL) {
- krb5_set_error_message(context, KRB5KDC_ERR_PREAUTH_FAILED, "Expecting FX_ERROR pa-data inside FAST container");
+ krb5_set_error_message(context, KRB5KDC_ERR_PREAUTH_FAILED,
+ _("Expecting FX_ERROR pa-data inside "
+ "FAST container"));
retval = KRB5KDC_ERR_PREAUTH_FAILED;
}
}
scratch.length = fx_error_pa->length;
retval = decode_krb5_error(&scratch, &fx_error);
}
- /*
- * krb5_pa_data and krb5_typed_data are safe to cast between:
- * they have the same type fields in the same order.
- * (krb5_preauthtype is a krb5_int32). If krb5_typed_data is
- * ever changed then this will need to be a copy not a cast.
- */
- if (retval == 0)
- retval = encode_krb5_typed_data( (const krb5_typed_data **)fast_response->padata,
- &encoded_td);
if (retval == 0) {
- fx_error->e_data = *encoded_td;
- free(encoded_td); /*contents owned by fx_error*/
- encoded_td = NULL;
krb5_free_error(context, err_reply);
*err_replyptr = fx_error;
fx_error = NULL;
* to retry the error if a cookie is present
*/
*retry = (*out_padata)[1] != NULL;
- if (krb5int_find_pa_data(context, *out_padata, KRB5_PADATA_FX_COOKIE) == NULL)
+ if (krb5int_find_pa_data(context, *out_padata,
+ KRB5_PADATA_FX_COOKIE) == NULL)
*retry = 0;
}
if (fx_error)
krb5_free_error(context, fx_error);
krb5_free_fast_response(context, fast_response);
} else { /*not FAST*/
+ /* Possibly retry if there's any e_data to process. */
*retry = (err_reply->e_data.length > 0);
- if ((err_reply->error == KDC_ERR_PREAUTH_REQUIRED
- ||err_reply->error == KDC_ERR_PREAUTH_FAILED) && err_reply->e_data.length) {
- krb5_pa_data **result = NULL;
- retval = decode_krb5_padata_sequence(&err_reply->e_data, &result);
- if (retval == 0)
- if (retval == 0) {
- *out_padata = result;
-
- return 0;
- }
- krb5_free_pa_data(context, result);
- krb5_set_error_message(context, retval,
- "Error decoding padata in error reply");
- return retval;
+ /* Try to decode e_data as pa-data or typed-data for out_padata. */
+ retval = decode_krb5_padata_sequence(&err_reply->e_data, out_padata);
+ if (retval != 0) {
+ krb5_typed_data **tdata;
+ /* krb5_typed data and krb5_pa_data are compatible structures. */
+ if (decode_krb5_typed_data(&err_reply->e_data, &tdata) == 0)
+ *out_padata = (krb5_pa_data **)tdata;
+ retval = 0;
}
}
return retval;
krb5_fast_response *fast_response = NULL;
krb5_data *encoded_ticket = NULL;
krb5_boolean cksum_valid;
+
krb5_clear_error_message(context);
*strengthen_key = NULL;
if (state->armor_key == 0)
if (retval == 0) {
if (fast_response->finished == 0) {
retval = KRB5_KDCREP_MODIFIED;
- krb5_set_error_message(context, retval, "FAST response missing finish message in KDC reply");
+ krb5_set_error_message(context, retval,
+ _("FAST response missing finish message "
+ "in KDC reply"));
}
}
if (retval == 0)
&cksum_valid);
if (retval == 0 && cksum_valid == 0) {
retval = KRB5_KDCREP_MODIFIED;
- krb5_set_error_message(context, retval, "ticket modified in KDC reply");
+ krb5_set_error_message(context, retval,
+ _("Ticket modified in KDC reply"));
}
if (retval == 0) {
krb5_free_principal(context, resp->client);
krb5_free_keyblock_contents(context, out_key);
if (strengthen_key) {
retval = krb5_c_fx_cf2_simple(context, strengthen_key,
- "strengthenkey", existing_key, "replykey", &key);
+ "strengthenkey", existing_key,
+ "replykey", &key);
if (retval == 0) {
+ TRACE_FAST_REPLY_KEY(context, key);
*out_key = *key;
free(key);
}
krb5_error_code
-krb5int_fast_make_state( krb5_context context, struct krb5int_fast_request_state **state)
+krb5int_fast_make_state(krb5_context context,
+ struct krb5int_fast_request_state **state)
{
struct krb5int_fast_request_state *local_state ;
+
local_state = malloc(sizeof *local_state);
if (local_state == NULL)
return ENOMEM;
}
void
-krb5int_fast_free_state( krb5_context context, struct krb5int_fast_request_state *state)
+krb5int_fast_free_state(krb5_context context,
+ struct krb5int_fast_request_state *state)
{
if (state == NULL)
return;
krb5_data scratch;
krb5_boolean valid;
+ *fast_avail = FALSE;
if (rep->enc_part2->flags& TKT_FLG_ENC_PA_REP) {
pa = krb5int_find_pa_data(context, rep->enc_part2->enc_padata,
KRB5_ENCPADATA_REQ_ENC_PA_REP);
*fast_avail = (pa != NULL);
}
}
+ TRACE_FAST_NEGO(context, *fast_avail);
if (checksum)
krb5_free_checksum(context, checksum);
return retval;
krb5_pa_data **padata)
{
if (state->armor_key != NULL)
- return 0; /*already using FAST*/
+ return FALSE; /* Already using FAST. */
if (!(state->fast_state_flags & KRB5INT_FAST_ARMOR_AVAIL))
- return 0;
+ return FALSE;
if (krb5int_find_pa_data(context, padata, KRB5_PADATA_FX_FAST) != NULL) {
+ TRACE_FAST_PADATA_UPGRADE(context);
state->fast_state_flags |= KRB5INT_FAST_DO_FAST;
- return 1;
+ return TRUE;
}
- return 0;
+ return FALSE;
}
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