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krb5/krb5-1.5.1-1.6-pal.patch

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- backport of preauth plugin support from 1.6
2007-01-22 21:24:18 +00:00
diff -upNr krb5-1.5.1 krb5-1.6
--- krb5/src/kdc/dispatch.c
+++ krb5/src/kdc/dispatch.c
@@ -94,7 +94,7 @@ dispatch(krb5_data *pkt, const krb5_full
* pointer.
*/
if (!(retval = setup_server_realm(as_req->server))) {
- retval = process_as_req(as_req, from, response);
+ retval = process_as_req(as_req, pkt, from, response);
}
krb5_free_kdc_req(kdc_context, as_req);
}
--- krb5/src/kdc/Makefile.in
+++ krb5/src/kdc/Makefile.in
@@ -13,7 +13,7 @@ PROG_LIBPATH=-L$(TOPLIBD) $(KRB4_LIBPATH
KDB5_LIB_DEPS=$(DL_LIB) $(THREAD_LINKOPTS)
PROG_RPATH=$(KRB5_LIBDIR)
FAKEKA=@FAKEKA@
-DEFS=
+DEFS=-DLIBDIR=\"$(KRB5_LIBDIR)\"
all:: krb5kdc rtest $(FAKEKA)
--- krb5/src/kdc/do_as_req.c
+++ krb5/src/kdc/do_as_req.c
@@ -50,8 +50,8 @@ static krb5_error_code prepare_error_as
/*ARGSUSED*/
krb5_error_code
-process_as_req(krb5_kdc_req *request, const krb5_fulladdr *from,
- krb5_data **response)
+process_as_req(krb5_kdc_req *request, krb5_data *req_pkt,
+ const krb5_fulladdr *from, krb5_data **response)
{
krb5_db_entry client, server;
krb5_kdc_rep reply;
@@ -78,6 +78,7 @@ process_as_req(krb5_kdc_req *request, co
char ktypestr[128];
char rep_etypestr[128];
char fromstringbuf[70];
+ void *pa_context = NULL;
ticket_reply.enc_part.ciphertext.data = 0;
e_data.data = 0;
@@ -260,7 +261,8 @@ process_as_req(krb5_kdc_req *request, co
* Check the preauthentication if it is there.
*/
if (request->padata) {
- errcode = check_padata(kdc_context, &client, request, &enc_tkt_reply);
+ errcode = check_padata(kdc_context, &client, req_pkt, request,
+ &enc_tkt_reply, &pa_context, &e_data);
if (errcode) {
#ifdef KRBCONF_KDC_MODIFIES_KDB
/*
@@ -381,8 +383,8 @@ process_as_req(krb5_kdc_req *request, co
reply_encpart.caddrs = enc_tkt_reply.caddrs;
/* Fetch the padata info to be returned */
- errcode = return_padata(kdc_context, &client, request, &reply, client_key,
- &encrypting_key);
+ errcode = return_padata(kdc_context, &client, req_pkt, request,
+ &reply, client_key, &encrypting_key, &pa_context);
if (errcode) {
status = "KDC_RETURN_PADATA";
goto errout;
@@ -427,8 +429,11 @@ process_as_req(krb5_kdc_req *request, co
#endif /* KRBCONF_KDC_MODIFIES_KDB */
errout:
+ if (pa_context)
+ free_padata_context(kdc_context, &pa_context);
+
if (status) {
- char * emsg = 0;
+ const char * emsg = 0;
if (errcode)
emsg = krb5_get_error_message (kdc_context, errcode);
--- krb5/src/kdc/kdc_preauth.c
+++ krb5/src/kdc/kdc_preauth.c
@@ -60,6 +60,13 @@
#include <syslog.h>
#include <assert.h>
+#include "../include/krb5/preauth_plugin.h"
+
+#if TARGET_OS_MAC
+static const char *objdirs[] = { KRB5_PLUGIN_BUNDLE_DIR, LIBDIR "/krb5/plugins/preauth", NULL }; /* should be a list */
+#else
+static const char *objdirs[] = { LIBDIR "/krb5/plugins/preauth", NULL };
+#endif
/* XXX This is ugly and should be in a header file somewhere */
#ifndef KRB5INT_DES_TYPES_DEFINED
@@ -72,44 +79,76 @@ extern int mit_des_is_weak_key (mit_des_
typedef krb5_error_code (*verify_proc)
(krb5_context, krb5_db_entry *client,
+ krb5_data *req_pkt,
krb5_kdc_req *request,
- krb5_enc_tkt_part * enc_tkt_reply, krb5_pa_data *data);
+ krb5_enc_tkt_part * enc_tkt_reply, krb5_pa_data *data,
+ preauth_get_entry_data_proc get_entry_data,
+ void *pa_module_context,
+ void **pa_request_context,
+ krb5_data **e_data);
typedef krb5_error_code (*edata_proc)
(krb5_context, krb5_kdc_req *request,
krb5_db_entry *client, krb5_db_entry *server,
+ preauth_get_entry_data_proc get_entry_data,
+ void *pa_module_context,
krb5_pa_data *data);
typedef krb5_error_code (*return_proc)
(krb5_context, krb5_pa_data * padata,
krb5_db_entry *client,
+ krb5_data *req_pkt,
krb5_kdc_req *request, krb5_kdc_rep *reply,
krb5_key_data *client_key,
krb5_keyblock *encrypting_key,
- krb5_pa_data **send_pa);
+ krb5_pa_data **send_pa,
+ preauth_get_entry_data_proc get_entry_data,
+ void *pa_module_context,
+ void **pa_request_context);
+
+typedef krb5_error_code (*freepa_proc)
+ (krb5_context, void *pa_module_context, void **pa_request_context);
+
+typedef krb5_error_code (*init_proc)
+ (krb5_context, void **);
+typedef void (*fini_proc)
+ (krb5_context, void *);
typedef struct _krb5_preauth_systems {
- char * name;
+ const char *name;
int type;
int flags;
+ void *plugin_context;
+ init_proc init;
+ fini_proc fini;
edata_proc get_edata;
verify_proc verify_padata;
return_proc return_padata;
+ freepa_proc free_pa_request_context;
} krb5_preauth_systems;
static krb5_error_code verify_enc_timestamp
(krb5_context, krb5_db_entry *client,
+ krb5_data *req_pkt,
krb5_kdc_req *request,
- krb5_enc_tkt_part * enc_tkt_reply, krb5_pa_data *data);
+ krb5_enc_tkt_part * enc_tkt_reply, krb5_pa_data *data,
+ preauth_get_entry_data_proc get_entry_data,
+ void *pa_system_context,
+ void **pa_request_context,
+ krb5_data **e_data);
static krb5_error_code get_etype_info
(krb5_context, krb5_kdc_req *request,
krb5_db_entry *client, krb5_db_entry *server,
+ preauth_get_entry_data_proc get_entry_data,
+ void *pa_system_context,
krb5_pa_data *data);
static krb5_error_code
get_etype_info2(krb5_context context, krb5_kdc_req *request,
- krb5_db_entry *client, krb5_db_entry *server,
- krb5_pa_data *pa_data);
+ krb5_db_entry *client, krb5_db_entry *server,
+ preauth_get_entry_data_proc get_entry_data,
+ void *pa_system_context,
+ krb5_pa_data *pa_data);
static krb5_error_code
etype_info_as_rep_helper(krb5_context context, krb5_pa_data * padata,
krb5_db_entry *client,
@@ -122,58 +161,76 @@ etype_info_as_rep_helper(krb5_context co
static krb5_error_code
return_etype_info(krb5_context, krb5_pa_data * padata,
krb5_db_entry *client,
+ krb5_data *req_pkt,
krb5_kdc_req *request, krb5_kdc_rep *reply,
krb5_key_data *client_key,
krb5_keyblock *encrypting_key,
- krb5_pa_data **send_pa);
+ krb5_pa_data **send_pa,
+ preauth_get_entry_data_proc get_entry_data,
+ void *pa_system_context,
+ void **pa_request_context);
static krb5_error_code
return_etype_info2(krb5_context, krb5_pa_data * padata,
krb5_db_entry *client,
+ krb5_data *req_pkt,
krb5_kdc_req *request, krb5_kdc_rep *reply,
krb5_key_data *client_key,
krb5_keyblock *encrypting_key,
- krb5_pa_data **send_pa);
+ krb5_pa_data **send_pa,
+ preauth_get_entry_data_proc get_entry_data,
+ void *pa_system_context,
+ void **pa_request_context);
static krb5_error_code return_pw_salt
(krb5_context, krb5_pa_data * padata,
krb5_db_entry *client,
+ krb5_data *req_pkt,
krb5_kdc_req *request, krb5_kdc_rep *reply,
krb5_key_data *client_key,
krb5_keyblock *encrypting_key,
- krb5_pa_data **send_pa);
+ krb5_pa_data **send_pa,
+ preauth_get_entry_data_proc get_entry_data,
+ void *pa_system_context,
+ void **pa_request_context);
/* SAM preauth support */
static krb5_error_code verify_sam_response
(krb5_context, krb5_db_entry *client,
+ krb5_data *req_pkt,
krb5_kdc_req *request,
- krb5_enc_tkt_part * enc_tkt_reply, krb5_pa_data *data);
+ krb5_enc_tkt_part * enc_tkt_reply, krb5_pa_data *data,
+ preauth_get_entry_data_proc get_entry_data,
+ void *pa_module_context,
+ void **pa_request_context,
+ krb5_data **e_data);
static krb5_error_code get_sam_edata
(krb5_context, krb5_kdc_req *request,
krb5_db_entry *client, krb5_db_entry *server,
+ preauth_get_entry_data_proc get_entry_data,
+ void *pa_module_context,
krb5_pa_data *data);
static krb5_error_code return_sam_data
(krb5_context, krb5_pa_data * padata,
krb5_db_entry *client,
+ krb5_data *req_pkt,
krb5_kdc_req *request, krb5_kdc_rep *reply,
krb5_key_data *client_key,
krb5_keyblock *encrypting_key,
- krb5_pa_data **send_pa);
-/*
- * Preauth property flags
- */
-#define PA_HARDWARE 0x00000001
-#define PA_REQUIRED 0x00000002
-#define PA_SUFFICIENT 0x00000004
- /* Not really a padata, so don't include it in the etype list*/
-#define PA_PSEUDO 0x00000008
+ krb5_pa_data **send_pa,
+ preauth_get_entry_data_proc get_entry_data,
+ void *pa_module_context,
+ void **pa_request_context);
-static krb5_preauth_systems preauth_systems[] = {
+static krb5_preauth_systems static_preauth_systems[] = {
{
"timestamp",
KRB5_PADATA_ENC_TIMESTAMP,
0,
+ NULL,
+ NULL,
+ NULL,
0,
verify_enc_timestamp,
0
@@ -182,6 +239,9 @@ static krb5_preauth_systems preauth_syst
"etype-info",
KRB5_PADATA_ETYPE_INFO,
0,
+ NULL,
+ NULL,
+ NULL,
get_etype_info,
0,
return_etype_info
@@ -190,6 +250,9 @@ static krb5_preauth_systems preauth_syst
"etype-info2",
KRB5_PADATA_ETYPE_INFO2,
0,
+ NULL,
+ NULL,
+ NULL,
get_etype_info2,
0,
return_etype_info2
@@ -198,6 +261,9 @@ static krb5_preauth_systems preauth_syst
"pw-salt",
KRB5_PADATA_PW_SALT,
PA_PSEUDO, /* Don't include this in the error list */
+ NULL,
+ NULL,
+ NULL,
0,
0,
return_pw_salt
@@ -206,6 +272,9 @@ static krb5_preauth_systems preauth_syst
"sam-response",
KRB5_PADATA_SAM_RESPONSE,
0,
+ NULL,
+ NULL,
+ NULL,
0,
verify_sam_response,
return_sam_data
@@ -214,6 +283,9 @@ static krb5_preauth_systems preauth_syst
"sam-challenge",
KRB5_PADATA_SAM_CHALLENGE,
PA_HARDWARE, /* causes get_preauth_hint_list to use this */
+ NULL,
+ NULL,
+ NULL,
get_sam_edata,
0,
0
@@ -221,13 +293,378 @@ static krb5_preauth_systems preauth_syst
{ "[end]", -1,}
};
-#define MAX_PREAUTH_SYSTEMS (sizeof(preauth_systems)/sizeof(preauth_systems[0]))
+static krb5_preauth_systems *preauth_systems;
+static int n_preauth_systems;
+static struct plugin_dir_handle preauth_plugins;
+
+krb5_error_code
+load_preauth_plugins(krb5_context context)
+{
+ struct errinfo err;
+ void **preauth_plugins_ftables;
+ struct krb5plugin_preauth_server_ftable_v0 *ftable;
+ int module_count, i, j, k;
+ void *plugin_context;
+ init_proc server_init_proc = NULL;
+
+ memset(&err, 0, sizeof(err));
+
+ /* Attempt to load all of the preauth plugins we can find. */
+ PLUGIN_DIR_INIT(&preauth_plugins);
+ if (PLUGIN_DIR_OPEN(&preauth_plugins) == 0) {
+ if (krb5int_open_plugin_dirs(objdirs, NULL,
+ &preauth_plugins, &err) != 0) {
+ return KRB5_PLUGIN_NO_HANDLE;
+ }
+ }
+
+ /* Get the method tables provided by the loaded plugins. */
+ preauth_plugins_ftables = NULL;
+ if (krb5int_get_plugin_dir_data(&preauth_plugins,
+ "preauthentication_server_0_backport_1_6",
+ &preauth_plugins_ftables, &err) != 0) {
+ return KRB5_PLUGIN_NO_HANDLE;
+ }
+
+ /* Count the valid modules. */
+ module_count = sizeof(static_preauth_systems)
+ / sizeof(static_preauth_systems[0]);
+ if (preauth_plugins_ftables != NULL) {
+ for (i = 0; preauth_plugins_ftables[i] != NULL; i++) {
+ ftable = preauth_plugins_ftables[i];
+ if ((ftable->flags_proc == NULL) &&
+ (ftable->edata_proc == NULL) &&
+ (ftable->verify_proc == NULL) &&
+ (ftable->return_proc == NULL)) {
+ continue;
+ }
+ for (j = 0;
+ ftable->pa_type_list != NULL &&
+ ftable->pa_type_list[j] > 0;
+ j++) {
+ module_count++;
+ }
+ }
+ }
+
+ /* Build the complete list of supported preauthentication options, and
+ * leave room for a terminator entry. */
+ preauth_systems = malloc(sizeof(krb5_preauth_systems) * (module_count + 1));
+ if (preauth_systems == NULL) {
+ krb5int_free_plugin_dir_data(preauth_plugins_ftables);
+ return ENOMEM;
+ }
+
+ /* Add the locally-supplied mechanisms to the dynamic list first. */
+ for (i = 0, k = 0;
+ i < sizeof(static_preauth_systems) / sizeof(static_preauth_systems[0]);
+ i++) {
+ if (static_preauth_systems[i].type == -1)
+ break;
+ preauth_systems[k] = static_preauth_systems[i];
+ /* Try to initialize the preauth system. If it fails, we'll remove it
+ * from the list of systems we'll be using. */
+ plugin_context = NULL;
+ server_init_proc = static_preauth_systems[i].init;
+ if ((server_init_proc != NULL) &&
+ ((*server_init_proc)(context, &plugin_context) != 0)) {
+ memset(&preauth_systems[k], 0, sizeof(preauth_systems[k]));
+ continue;
+ }
+ preauth_systems[k].plugin_context = plugin_context;
+ k++;
+ }
+
+ /* Now add the dynamically-loaded mechanisms to the list. */
+ if (preauth_plugins_ftables != NULL) {
+ for (i = 0; preauth_plugins_ftables[i] != NULL; i++) {
+ ftable = preauth_plugins_ftables[i];
+ if ((ftable->flags_proc == NULL) &&
+ (ftable->edata_proc == NULL) &&
+ (ftable->verify_proc == NULL) &&
+ (ftable->return_proc == NULL)) {
+ continue;
+ }
+ plugin_context = NULL;
+ for (j = 0;
+ ftable->pa_type_list != NULL &&
+ ftable->pa_type_list[j] > 0;
+ j++) {
+ /* Try to initialize the plugin. If it fails, we'll remove it
+ * from the list of modules we'll be using. */
+ if (j == 0) {
+ server_init_proc = ftable->init_proc;
+ if (server_init_proc != NULL) {
+ krb5_error_code initerr;
+ initerr = (*server_init_proc)(context, &plugin_context);
+ if (initerr) {
+ const char *emsg;
+ emsg = krb5_get_error_message(context, initerr);
+ if (emsg) {
+ krb5_klog_syslog(LOG_ERR,
+ "preauth %s failed to initialize: %s",
+ ftable->name, emsg);
+ krb5_free_error_message(context, emsg);
+ }
+ memset(&preauth_systems[k], 0, sizeof(preauth_systems[k]));
+
+ break; /* skip all modules in this plugin */
+ }
+ }
+ }
+ preauth_systems[k].name = ftable->name;
+ preauth_systems[k].type = ftable->pa_type_list[j];
+ if (ftable->flags_proc != NULL)
+ preauth_systems[k].flags = ftable->flags_proc(context, preauth_systems[k].type);
+ else
+ preauth_systems[k].flags = 0;
+ preauth_systems[k].plugin_context = plugin_context;
+ preauth_systems[k].init = server_init_proc;
+ /* Only call fini once for each plugin */
+ if (j == 0)
+ preauth_systems[k].fini = ftable->fini_proc;
+ else
+ preauth_systems[k].fini = NULL;
+ preauth_systems[k].get_edata = ftable->edata_proc;
+ preauth_systems[k].verify_padata = ftable->verify_proc;
+ preauth_systems[k].return_padata = ftable->return_proc;
+ preauth_systems[k].free_pa_request_context =
+ ftable->freepa_reqcontext_proc;
+ k++;
+ }
+ }
+ krb5int_free_plugin_dir_data(preauth_plugins_ftables);
+ }
+ n_preauth_systems = k;
+ /* Add the end-of-list marker. */
+ preauth_systems[k].name = "[end]";
+ preauth_systems[k].type = -1;
+ return 0;
+}
+
+krb5_error_code
+unload_preauth_plugins(krb5_context context)
+{
+ int i;
+ if (preauth_systems != NULL) {
+ for (i = 0; i < n_preauth_systems; i++) {
+ if (preauth_systems[i].fini != NULL) {
+ (*preauth_systems[i].fini)(context,
+ preauth_systems[i].plugin_context);
+ }
+ memset(&preauth_systems[i], 0, sizeof(preauth_systems[i]));
+ }
+ free(preauth_systems);
+ preauth_systems = NULL;
+ n_preauth_systems = 0;
+ krb5int_close_plugin_dirs(&preauth_plugins);
+ }
+ return 0;
+}
+
+/*
+ * The make_padata_context() function creates a space for storing any context
+ * information which will be needed by return_padata() later. Each preauth
+ * type gets a context storage location of its own.
+ */
+struct request_pa_context {
+ int n_contexts;
+ struct {
+ krb5_preauth_systems *pa_system;
+ void *pa_context;
+ } *contexts;
+};
+
+static krb5_error_code
+make_padata_context(krb5_context context, void **padata_context)
+{
+ int i;
+ struct request_pa_context *ret;
+
+ ret = malloc(sizeof(*ret));
+ if (ret == NULL) {
+ return ENOMEM;
+ }
+
+ ret->n_contexts = n_preauth_systems;
+ ret->contexts = malloc(sizeof(ret->contexts[0]) * ret->n_contexts);
+ if (ret->contexts == NULL) {
+ free(ret);
+ return ENOMEM;
+ }
+
+ memset(ret->contexts, 0, sizeof(ret->contexts[0]) * ret->n_contexts);
+
+ for (i = 0; i < ret->n_contexts; i++) {
+ ret->contexts[i].pa_system = &preauth_systems[i];
+ ret->contexts[i].pa_context = NULL;
+ }
+
+ *padata_context = ret;
+
+ return 0;
+}
+
+/*
+ * The free_padata_context function frees any context information pointers
+ * which the check_padata() function created but which weren't already cleaned
+ * up by return_padata().
+ */
+krb5_error_code
+free_padata_context(krb5_context kcontext, void **padata_context)
+{
+ struct request_pa_context *context;
+ krb5_preauth_systems *preauth_system;
+ void **pctx, *mctx;
+ int i;
+
+ if (padata_context == NULL)
+ return 0;
+
+ context = *padata_context;
+
+ for (i = 0; i < context->n_contexts; i++) {
+ if (context->contexts[i].pa_context != NULL) {
+ preauth_system = context->contexts[i].pa_system;
+ mctx = preauth_system->plugin_context;
+ if (preauth_system->free_pa_request_context != NULL) {
+ pctx = &context->contexts[i].pa_context;
+ (*preauth_system->free_pa_request_context)(kcontext, mctx,
+ pctx);
+ }
+ context->contexts[i].pa_context = NULL;
+ }
+ }
+
+ free(context->contexts);
+ free(context);
+
+ return 0;
+}
+
+/* Retrieve a specified tl_data item from the given entry, and return its
+ * contents in a new krb5_data, which must be freed by the caller. */
+static krb5_error_code
+get_entry_tl_data(krb5_context context, krb5_db_entry *entry,
+ krb5_int16 tl_data_type, krb5_data **result)
+{
+ krb5_tl_data *tl;
+ for (tl = entry->tl_data; tl != NULL; tl = tl->tl_data_next) {
+ if (tl->tl_data_type == tl_data_type) {
+ *result = malloc(sizeof(krb5_data));
+ if (*result == NULL) {
+ return ENOMEM;
+ }
+ (*result)->magic = KV5M_DATA;
+ (*result)->data = malloc(tl->tl_data_length);
+ if ((*result)->data == NULL) {
+ free(*result);
+ *result = NULL;
+ return ENOMEM;
+ }
+ memcpy((*result)->data, tl->tl_data_contents, tl->tl_data_length);
+ return 0;
+ }
+ }
+ return ENOENT;
+}
+
+/*
+ * Retrieve a specific piece of information pertaining to the entry or the
+ * request and return it in a new krb5_data item which the caller must free.
+ *
+ * This may require massaging data into a contrived format, but it will
+ * hopefully keep us from having to reveal library-internal functions to
+ * modules.
+ */
+static krb5_error_code
+get_entry_data(krb5_context context,
+ krb5_kdc_req *request, krb5_db_entry *entry,
+ krb5_int32 type,
+ krb5_data **result)
+{
+ int i, k;
+ krb5_data *ret;
+ krb5_deltat *delta;
+ krb5_keyblock *keys;
+ krb5_key_data *entry_key;
+
+ switch (type) {
+ case krb5plugin_preauth_entry_request_certificate:
+ return get_entry_tl_data(context, entry,
+ KRB5_TL_USER_CERTIFICATE, result);
+ break;
+ case krb5plugin_preauth_entry_max_time_skew:
+ ret = malloc(sizeof(krb5_data));
+ if (ret == NULL)
+ return ENOMEM;
+ delta = malloc(sizeof(krb5_deltat));
+ if (delta == NULL) {
+ free(ret);
+ return ENOMEM;
+ }
+ *delta = context->clockskew;
+ ret->data = (char *) delta;
+ ret->length = sizeof(*delta);
+ *result = ret;
+ return 0;
+ break;
+ case krb5plugin_preauth_keys:
+ ret = malloc(sizeof(krb5_data));
+ if (ret == NULL)
+ return ENOMEM;
+ keys = malloc(sizeof(krb5_keyblock) * (request->nktypes + 1));
+ if (keys == NULL) {
+ free(ret);
+ return ENOMEM;
+ }
+ ret->data = (char *) keys;
+ ret->length = sizeof(krb5_keyblock) * (request->nktypes + 1);
+ memset(ret->data, 0, ret->length);
+ k = 0;
+ for (i = 0; i < request->nktypes; i++) {
+ entry_key = NULL;
+ if (krb5_dbe_find_enctype(context, entry, request->ktype[i],
+ -1, 0, &entry_key) != 0)
+ continue;
+ if (krb5_dbekd_decrypt_key_data(context, &master_keyblock,
+ entry_key, &keys[k], NULL) != 0) {
+ if (keys[k].contents != NULL)
+ krb5_free_keyblock_contents(context, &keys[k]);
+ memset(&keys[k], 0, sizeof(keys[k]));
+ continue;
+ }
+ k++;
+ }
+ if (k > 0) {
+ *result = ret;
+ return 0;
+ } else {
+ free(keys);
+ free(ret);
+ }
+ break;
+ case krb5plugin_preauth_request_body:
+ ret = NULL;
+ encode_krb5_kdc_req_body(request, &ret);
+ if (ret != NULL) {
+ *result = ret;
+ return 0;
+ }
+ return ASN1_PARSE_ERROR;
+ break;
+ default:
+ break;
+ }
+ return ENOENT;
+}
static krb5_error_code
find_pa_system(int type, krb5_preauth_systems **preauth)
{
- krb5_preauth_systems *ap = preauth_systems;
-
+ krb5_preauth_systems *ap;
+
+ ap = preauth_systems ? preauth_systems : static_preauth_systems;
while ((ap->type != -1) && (ap->type != type))
ap++;
if (ap->type == -1)
@@ -236,6 +673,113 @@ find_pa_system(int type, krb5_preauth_sy
return 0;
}
+static krb5_error_code
+find_pa_context(krb5_preauth_systems *pa_sys,
+ struct request_pa_context *context,
+ void ***pa_context)
+{
+ int i;
+
+ *pa_context = 0;
+
+ if (context == NULL)
+ return KRB5KRB_ERR_GENERIC;
+
+ for (i = 0; i < context->n_contexts; i++) {
+ if (context->contexts[i].pa_system == pa_sys) {
+ *pa_context = &context->contexts[i].pa_context;
+ return 0;
+ }
+ }
+
+ return KRB5KRB_ERR_GENERIC;
+}
+
+/*
+ * Create a list of indices into the preauth_systems array, sorted by order of
+ * preference.
+ */
+static krb5_boolean
+pa_list_includes(krb5_pa_data **pa_data, krb5_preauthtype pa_type)
+{
+ while (*pa_data != NULL) {
+ if ((*pa_data)->pa_type == pa_type)
+ return TRUE;
+ pa_data++;
+ }
+ return FALSE;
+}
+static void
+sort_pa_order(krb5_context context, krb5_kdc_req *request, int *pa_order)
+{
+ int i, j, k, n_repliers, n_key_replacers;
+
+ /* First, set up the default order. */
+ i = 0;
+ for (j = 0; j < n_preauth_systems; j++) {
+ if (preauth_systems[j].return_padata != NULL)
+ pa_order[i++] = j;
+ }
+ n_repliers = i;
+ pa_order[n_repliers] = -1;
+
+ /* Reorder so that PA_REPLACES_KEY modules are listed first. */
+ for (i = 0; i < n_repliers; i++) {
+ /* If this module replaces the key, then it's okay to leave it where it
+ * is in the order. */
+ if (preauth_systems[pa_order[i]].flags & PA_REPLACES_KEY)
+ continue;
+ /* If not, search for a module which does, and swap in the first one we
+ * find. */
+ for (j = i + 1; j < n_repliers; j++) {
+ if (preauth_systems[pa_order[j]].flags & PA_REPLACES_KEY) {
+ k = pa_order[j];
+ pa_order[j] = pa_order[i];
+ pa_order[i] = k;
+ break;
+ }
+ }
+ }
+
+ if (request->padata != NULL) {
+ /* Now reorder the subset of modules which replace the key,
+ * bubbling those which handle pa_data types provided by the
+ * client ahead of the others. */
+ for (i = 0; preauth_systems[pa_order[i]].flags & PA_REPLACES_KEY; i++) {
+ continue;
+ }
+ n_key_replacers = i;
+ for (i = 0; i < n_key_replacers; i++) {
+ if (pa_list_includes(request->padata,
+ preauth_systems[pa_order[i]].type))
+ continue;
+ for (j = i + 1; j < n_key_replacers; j++) {
+ if (pa_list_includes(request->padata,
+ preauth_systems[pa_order[j]].type)) {
+ k = pa_order[j];
+ pa_order[j] = pa_order[i];
+ pa_order[i] = k;
+ break;
+ }
+ }
+ }
+ }
+#ifdef DEBUG
+ krb5_klog_syslog(LOG_DEBUG, "original preauth mechanism list:");
+ for (i = 0; i < n_preauth_systems; i++) {
+ if (preauth_systems[i].return_padata != NULL)
+ krb5_klog_syslog(LOG_DEBUG, "... %s(%d)", preauth_systems[i].name,
+ preauth_systems[i].type);
+ }
+ krb5_klog_syslog(LOG_DEBUG, "sorted preauth mechanism list:");
+ for (i = 0; pa_order[i] != -1; i++) {
+ krb5_klog_syslog(LOG_DEBUG, "... %s(%d)",
+ preauth_systems[pa_order[i]].name,
+ preauth_systems[pa_order[i]].type);
+ }
+#endif
+}
+
const char *missing_required_preauth(krb5_db_entry *client,
krb5_db_entry *server,
krb5_enc_tkt_part *enc_tkt_reply)
@@ -287,10 +831,10 @@ void get_preauth_hint_list(krb5_kdc_req
e_data->data = 0;
hw_only = isflagset(client->attributes, KRB5_KDB_REQUIRES_HW_AUTH);
- pa_data = malloc(sizeof(krb5_pa_data *) * (MAX_PREAUTH_SYSTEMS+1));
+ pa_data = malloc(sizeof(krb5_pa_data *) * (n_preauth_systems+1));
if (pa_data == 0)
return;
- memset(pa_data, 0, sizeof(krb5_pa_data *) * (MAX_PREAUTH_SYSTEMS+1));
+ memset(pa_data, 0, sizeof(krb5_pa_data *) * (n_preauth_systems+1));
pa = pa_data;
for (ap = preauth_systems; ap->type != -1; ap++) {
@@ -305,7 +849,8 @@ void get_preauth_hint_list(krb5_kdc_req
(*pa)->magic = KV5M_PA_DATA;
(*pa)->pa_type = ap->type;
if (ap->get_edata) {
- retval = (ap->get_edata)(kdc_context, request, client, server, *pa);
+ retval = (ap->get_edata)(kdc_context, request, client, server,
+ get_entry_data, ap->plugin_context, *pa);
if (retval) {
/* just failed on this type, continue */
free(*pa);
@@ -335,23 +880,33 @@ errout:
/*
* This routine is called to verify the preauthentication information
* for a V5 request.
- *
+ *
* Returns 0 if the pre-authentication is valid, non-zero to indicate
* an error code of some sort.
*/
krb5_error_code
-check_padata (krb5_context context, krb5_db_entry *client,
- krb5_kdc_req *request, krb5_enc_tkt_part *enc_tkt_reply)
+check_padata (krb5_context context, krb5_db_entry *client, krb5_data *req_pkt,
+ krb5_kdc_req *request, krb5_enc_tkt_part *enc_tkt_reply,
+ void **padata_context, krb5_data *e_data)
{
krb5_error_code retval = 0;
krb5_pa_data **padata;
krb5_preauth_systems *pa_sys;
- int pa_ok = 0, pa_found = 0;
+ void **pa_context;
+ krb5_data *pa_e_data = NULL, *tmp_e_data = NULL;
+ int pa_ok = 0, pa_found = 0;
+ krb5_error_code saved_retval = 0;
+ int use_saved_retval = 0;
+ const char *emsg;
if (request->padata == 0)
return 0;
+ if (make_padata_context(context, padata_context) != 0) {
+ return KRB5KRB_ERR_GENERIC;
+ }
+
#ifdef DEBUG
krb5_klog_syslog (LOG_DEBUG, "checking padata");
#endif
@@ -361,52 +916,128 @@ check_padata (krb5_context context, krb5
#endif
if (find_pa_system((*padata)->pa_type, &pa_sys))
continue;
+ if (find_pa_context(pa_sys, *padata_context, &pa_context))
+ continue;
#ifdef DEBUG
krb5_klog_syslog (LOG_DEBUG, ".. pa_type %s", pa_sys->name);
#endif
if (pa_sys->verify_padata == 0)
continue;
pa_found++;
- retval = pa_sys->verify_padata(context, client, request,
- enc_tkt_reply, *padata);
+ retval = pa_sys->verify_padata(context, client, req_pkt, request,
+ enc_tkt_reply, *padata,
+ get_entry_data, pa_sys->plugin_context,
+ pa_context, &tmp_e_data);
if (retval) {
- char * emsg = krb5_get_error_message (context, retval);
+ emsg = krb5_get_error_message (context, retval);
krb5_klog_syslog (LOG_INFO, "preauth (%s) verify failure: %s",
pa_sys->name, emsg);
krb5_free_error_message (context, emsg);
if (pa_sys->flags & PA_REQUIRED) {
+ /* free up any previous edata we might have been saving */
+ if (pa_e_data != NULL)
+ krb5_free_data(context, pa_e_data);
+ pa_e_data = tmp_e_data;
+ tmp_e_data = NULL;
+ use_saved_retval = 0; /* Make sure we use the current retval */
pa_ok = 0;
break;
}
+ /*
+ * We'll return edata from either the first PA_REQUIRED module
+ * that fails, or the first non-PA_REQUIRED module that fails.
+ * Hang on to edata from the first non-PA_REQUIRED module.
+ * If we've already got one saved, simply discard this one.
+ */
+ if (tmp_e_data != NULL) {
+ if (pa_e_data == NULL) {
+ /* save the first error code and e-data */
+ pa_e_data = tmp_e_data;
+ tmp_e_data = NULL;
+ saved_retval = retval;
+ use_saved_retval = 1;
+ } else {
+ /* discard this extra e-data from non-PA_REQUIRED module */
+ krb5_free_data(context, tmp_e_data);
+ tmp_e_data = NULL;
+ }
+ }
} else {
#ifdef DEBUG
krb5_klog_syslog (LOG_DEBUG, ".. .. ok");
#endif
+ /* Ignore any edata returned on success */
+ if (tmp_e_data != NULL) {
+ krb5_free_data(context, tmp_e_data);
+ tmp_e_data = NULL;
+ }
pa_ok = 1;
- if (pa_sys->flags & PA_SUFFICIENT)
+ if (pa_sys->flags & PA_SUFFICIENT)
break;
}
}
+
+ /* Don't bother copying and returning e-data on success */
+ if (pa_ok && pa_e_data != NULL) {
+ krb5_free_data(context, pa_e_data);
+ pa_e_data = NULL;
+ }
+ /* Return any e-data from the preauth that caused us to exit the loop */
+ if (pa_e_data != NULL) {
+ e_data->data = malloc(pa_e_data->length);
+ if (e_data->data == NULL) {
+ krb5_free_data(context, pa_e_data);
+ return KRB5KRB_ERR_GENERIC;
+ }
+ memcpy(e_data->data, pa_e_data->data, pa_e_data->length);
+ e_data->length = pa_e_data->length;
+ krb5_free_data(context, pa_e_data);
+ pa_e_data = NULL;
+ if (use_saved_retval != 0)
+ retval = saved_retval;
+ }
+
if (pa_ok)
return 0;
/* pa system was not found, but principal doesn't require preauth */
if (!pa_found &&
- !isflagset(client->attributes, KRB5_KDB_REQUIRES_PRE_AUTH) &&
- !isflagset(client->attributes, KRB5_KDB_REQUIRES_HW_AUTH))
+ !isflagset(client->attributes, KRB5_KDB_REQUIRES_PRE_AUTH) &&
+ !isflagset(client->attributes, KRB5_KDB_REQUIRES_HW_AUTH))
return 0;
if (!pa_found) {
- char *emsg = krb5_get_error_message(context, retval);
+ emsg = krb5_get_error_message(context, retval);
krb5_klog_syslog (LOG_INFO, "no valid preauth type found: %s", emsg);
krb5_free_error_message(context, emsg);
}
-/* The following switch statement allows us
- * to return some preauth system errors back to the client.
- */
- switch(retval) {
- case KRB5KRB_AP_ERR_BAD_INTEGRITY:
+ /* The following switch statement allows us
+ * to return some preauth system errors back to the client.
+ */
+ switch(retval) {
+ case KRB5KRB_AP_ERR_BAD_INTEGRITY:
case KRB5KRB_AP_ERR_SKEW:
+ case KRB5KDC_ERR_ETYPE_NOSUPP:
+ /* rfc 4556 */
+ case KRB5KDC_ERR_CLIENT_NOT_TRUSTED:
+ case KRB5KDC_ERR_INVALID_SIG:
+ case KRB5KDC_ERR_DH_KEY_PARAMETERS_NOT_ACCEPTED:
+ case KRB5KDC_ERR_CANT_VERIFY_CERTIFICATE:
+ case KRB5KDC_ERR_INVALID_CERTIFICATE:
+ case KRB5KDC_ERR_REVOKED_CERTIFICATE:
+ case KRB5KDC_ERR_REVOCATION_STATUS_UNKNOWN:
+ case KRB5KDC_ERR_CLIENT_NAME_MISMATCH:
+ case KRB5KDC_ERR_INCONSISTENT_KEY_PURPOSE:
+ case KRB5KDC_ERR_DIGEST_IN_CERT_NOT_ACCEPTED:
+ case KRB5KDC_ERR_PA_CHECKSUM_MUST_BE_INCLUDED:
+ case KRB5KDC_ERR_DIGEST_IN_SIGNED_DATA_NOT_ACCEPTED:
+ case KRB5KDC_ERR_PUBLIC_KEY_ENCRYPTION_NOT_SUPPORTED:
+ /* earlier drafts of what became rfc 4556 */
+ case KRB5KDC_ERR_CERTIFICATE_MISMATCH:
+ case KRB5KDC_ERR_KDC_NOT_TRUSTED:
+ case KRB5KDC_ERR_REVOCATION_STATUS_UNAVAILABLE:
+ /* This value is shared with KRB5KDC_ERR_DH_KEY_PARAMETERS_NOT_ACCEPTED. */
+ /* case KRB5KDC_ERR_KEY_TOO_WEAK: */
return retval;
default:
return KRB5KDC_ERR_PREAUTH_FAILED;
@@ -418,9 +1049,10 @@ check_padata (krb5_context context, krb5
* structures which should be returned by the KDC to the client
*/
krb5_error_code
-return_padata(krb5_context context, krb5_db_entry *client,
+return_padata(krb5_context context, krb5_db_entry *client, krb5_data *req_pkt,
krb5_kdc_req *request, krb5_kdc_rep *reply,
- krb5_key_data *client_key, krb5_keyblock *encrypting_key)
+ krb5_key_data *client_key, krb5_keyblock *encrypting_key,
+ void **padata_context)
{
krb5_error_code retval;
krb5_pa_data ** padata;
@@ -428,7 +1060,15 @@ return_padata(krb5_context context, krb5
krb5_pa_data ** send_pa;
krb5_pa_data * pa = 0;
krb5_preauth_systems * ap;
+ int * pa_order;
+ int * pa_type;
int size = 0;
+ void ** pa_context;
+ krb5_boolean key_modified;
+ krb5_keyblock original_key;
+ if ((!*padata_context)&& (make_padata_context(context, padata_context) != 0)) {
+ return KRB5KRB_ERR_GENERIC;
+ }
for (ap = preauth_systems; ap->type != -1; ap++) {
if (ap->return_padata)
@@ -437,13 +1077,42 @@ return_padata(krb5_context context, krb5
if ((send_pa_list = malloc((size+1) * sizeof(krb5_pa_data *))) == NULL)
return ENOMEM;
+ if ((pa_order = malloc((size+1) * sizeof(int))) == NULL) {
+ free(send_pa_list);
+ return ENOMEM;
+ }
+ sort_pa_order(context, request, pa_order);
+
+ retval = krb5_copy_keyblock_contents(context, encrypting_key,
+ &original_key);
+ if (retval) {
+ free(send_pa_list);
+ free(pa_order);
+ return retval;
+ }
+ key_modified = FALSE;
send_pa = send_pa_list;
*send_pa = 0;
-
- for (ap = preauth_systems; ap->type != -1; ap++) {
+
+ for (pa_type = pa_order; *pa_type != -1; pa_type++) {
+ ap = &preauth_systems[*pa_type];
+ if (!key_modified)
+ if (original_key.enctype != encrypting_key->enctype)
+ key_modified = TRUE;
+ if (!key_modified)
+ if (original_key.length != encrypting_key->length)
+ key_modified = TRUE;
+ if (!key_modified)
+ if (memcmp(original_key.contents, encrypting_key->contents,
+ original_key.length) != 0)
+ key_modified = TRUE;
+ if (key_modified && (ap->flags & PA_REPLACES_KEY))
+ continue;
if (ap->return_padata == 0)
continue;
+ if (find_pa_context(ap, *padata_context, &pa_context))
+ continue;
pa = 0;
if (request->padata) {
for (padata = request->padata; *padata; padata++) {
@@ -453,9 +1122,12 @@ return_padata(krb5_context context, krb5
}
}
}
- if ((retval = ap->return_padata(context, pa, client, request, reply,
- client_key, encrypting_key, send_pa)))
+ if ((retval = ap->return_padata(context, pa, client, req_pkt, request, reply,
+ client_key, encrypting_key, send_pa,
+ get_entry_data, ap->plugin_context,
+ pa_context))) {
goto cleanup;
+ }
if (*send_pa)
send_pa++;
@@ -470,6 +1142,8 @@ return_padata(krb5_context context, krb5
}
cleanup:
+ krb5_free_keyblock_contents(context, &original_key);
+ free(pa_order);
if (send_pa_list)
krb5_free_pa_data(context, send_pa_list);
return (retval);
@@ -508,8 +1182,13 @@ request_contains_enctype (krb5_context c
static krb5_error_code
verify_enc_timestamp(krb5_context context, krb5_db_entry *client,
+ krb5_data *req_pkt,
krb5_kdc_req *request, krb5_enc_tkt_part *enc_tkt_reply,
- krb5_pa_data *pa)
+ krb5_pa_data *pa,
+ preauth_get_entry_data_proc ets_get_entry_data,
+ void *pa_system_context,
+ void **pa_request_context,
+ krb5_data **e_data)
{
krb5_pa_enc_ts * pa_enc = 0;
krb5_error_code retval;
@@ -749,6 +1428,8 @@ cleanup:
static krb5_error_code
get_etype_info(krb5_context context, krb5_kdc_req *request,
krb5_db_entry *client, krb5_db_entry *server,
+ preauth_get_entry_data_proc etype_get_entry_data,
+ void *pa_system_context,
krb5_pa_data *pa_data)
{
int i;
@@ -764,6 +1445,8 @@ get_etype_info(krb5_context context, krb
static krb5_error_code
get_etype_info2(krb5_context context, krb5_kdc_req *request,
krb5_db_entry *client, krb5_db_entry *server,
+ preauth_get_entry_data_proc etype_get_entry_data,
+ void *pa_system_context,
krb5_pa_data *pa_data)
{
return etype_info_helper( context, request, client, server, pa_data, 1);
@@ -849,10 +1532,14 @@ etype_info_as_rep_helper(krb5_context co
static krb5_error_code
return_etype_info2(krb5_context context, krb5_pa_data * padata,
krb5_db_entry *client,
+ krb5_data *req_pkt,
krb5_kdc_req *request, krb5_kdc_rep *reply,
krb5_key_data *client_key,
krb5_keyblock *encrypting_key,
- krb5_pa_data **send_pa)
+ krb5_pa_data **send_pa,
+ preauth_get_entry_data_proc etype_get_entry_data,
+ void *pa_system_context,
+ void **pa_request_context)
{
return etype_info_as_rep_helper(context, padata, client, request, reply,
client_key, encrypting_key, send_pa, 1);
@@ -862,10 +1549,14 @@ return_etype_info2(krb5_context context,
static krb5_error_code
return_etype_info(krb5_context context, krb5_pa_data * padata,
krb5_db_entry *client,
+ krb5_data *req_pkt,
krb5_kdc_req *request, krb5_kdc_rep *reply,
krb5_key_data *client_key,
krb5_keyblock *encrypting_key,
- krb5_pa_data **send_pa)
+ krb5_pa_data **send_pa,
+ preauth_get_entry_data_proc etypeget_entry_data,
+ void *pa_system_context,
+ void **pa_request_context)
{
return etype_info_as_rep_helper(context, padata, client, request, reply,
client_key, encrypting_key, send_pa, 0);
@@ -873,9 +1564,12 @@ return_etype_info(krb5_context context,
static krb5_error_code
return_pw_salt(krb5_context context, krb5_pa_data *in_padata,
- krb5_db_entry *client, krb5_kdc_req *request,
+ krb5_db_entry *client, krb5_data *req_pkt, krb5_kdc_req *request,
krb5_kdc_rep *reply, krb5_key_data *client_key,
- krb5_keyblock *encrypting_key, krb5_pa_data **send_pa)
+ krb5_keyblock *encrypting_key, krb5_pa_data **send_pa,
+ preauth_get_entry_data_proc etype_get_entry_data,
+ void *pa_system_context,
+ void **pa_request_context)
{
krb5_error_code retval;
krb5_pa_data * padata;
@@ -960,9 +1654,12 @@ cleanup:
static krb5_error_code
return_sam_data(krb5_context context, krb5_pa_data *in_padata,
- krb5_db_entry *client, krb5_kdc_req *request,
+ krb5_db_entry *client, krb5_data *req_pkt, krb5_kdc_req *request,
krb5_kdc_rep *reply, krb5_key_data *client_key,
- krb5_keyblock *encrypting_key, krb5_pa_data **send_pa)
+ krb5_keyblock *encrypting_key, krb5_pa_data **send_pa,
+ preauth_get_entry_data_proc sam_get_entry_data,
+ void *pa_system_context,
+ void **pa_request_context)
{
krb5_error_code retval;
krb5_data scratch;
@@ -1101,7 +1798,8 @@ static struct {
static krb5_error_code
get_sam_edata(krb5_context context, krb5_kdc_req *request,
krb5_db_entry *client, krb5_db_entry *server,
- krb5_pa_data *pa_data)
+ preauth_get_entry_data_proc sam_get_entry_data,
+ void *pa_system_context, krb5_pa_data *pa_data)
{
krb5_error_code retval;
krb5_sam_challenge sc;
@@ -1472,8 +2170,13 @@ cleanup:
static krb5_error_code
verify_sam_response(krb5_context context, krb5_db_entry *client,
+ krb5_data *req_pkt,
krb5_kdc_req *request, krb5_enc_tkt_part *enc_tkt_reply,
- krb5_pa_data *pa)
+ krb5_pa_data *pa,
+ preauth_get_entry_data_proc sam_get_entry_data,
+ void *pa_system_context,
+ void **pa_request_context,
+ krb5_data **e_data)
{
krb5_error_code retval;
krb5_data scratch;
--- krb5/src/kdc/main.c
+++ krb5/src/kdc/main.c
@@ -382,10 +382,13 @@ setup_signal_handlers(void)
(void) sigaction(SIGTERM, &s_action, (struct sigaction *) NULL);
s_action.sa_handler = request_hup;
(void) sigaction(SIGHUP, &s_action, (struct sigaction *) NULL);
+ s_action.sa_handler = SIG_IGN;
+ (void) sigaction(SIGPIPE, &s_action, (struct sigaction *) NULL);
#else /* POSIX_SIGNALS */
signal(SIGINT, request_exit);
signal(SIGTERM, request_exit);
signal(SIGHUP, request_hup);
+ signal(SIGPIPE, SIG_IGN);
#endif /* POSIX_SIGNALS */
return;
@@ -711,6 +714,8 @@ int main(int argc, char **argv)
setup_signal_handlers();
+ load_preauth_plugins(kcontext);
+
retval = setup_sam();
if (retval) {
com_err(argv[0], retval, "while initializing SAM");
@@ -738,6 +743,7 @@ int main(int argc, char **argv)
errout++;
}
krb5_klog_syslog(LOG_INFO, "shutting down");
+ unload_preauth_plugins(kcontext);
krb5_klog_close(kdc_context);
finish_realms(argv[0]);
if (kdc_realmlist)
--- krb5/src/kdc/kdc_util.h
+++ krb5/src/kdc/kdc_util.h
@@ -107,7 +107,7 @@ void
rep_etypes2str(char *s, size_t len, krb5_kdc_rep *rep);
/* do_as_req.c */
-krb5_error_code process_as_req (krb5_kdc_req *,
+krb5_error_code process_as_req (krb5_kdc_req *, krb5_data *,
const krb5_fulladdr *,
krb5_data ** );
@@ -146,15 +146,23 @@ void get_preauth_hint_list (krb5_kdc_req
krb5_db_entry *client,
krb5_db_entry *server,
krb5_data *e_data);
+krb5_error_code load_preauth_plugins(krb5_context context);
+krb5_error_code unload_preauth_plugins(krb5_context context);
+
krb5_error_code check_padata
- (krb5_context context, krb5_db_entry *client,
- krb5_kdc_req *request, krb5_enc_tkt_part *enc_tkt_reply);
+ (krb5_context context, krb5_db_entry *client, krb5_data *req_pkt,
+ krb5_kdc_req *request, krb5_enc_tkt_part *enc_tkt_reply,
+ void **padata_context, krb5_data *e_data);
krb5_error_code return_padata
(krb5_context context, krb5_db_entry *client,
- krb5_kdc_req *request, krb5_kdc_rep *reply,
- krb5_key_data *client_key, krb5_keyblock *encrypting_key);
+ krb5_data *req_pkt, krb5_kdc_req *request, krb5_kdc_rep *reply,
+ krb5_key_data *client_key, krb5_keyblock *encrypting_key,
+ void **padata_context);
+krb5_error_code free_padata_context
+ (krb5_context context, void **padata_context);
+
/* replay.c */
krb5_boolean kdc_check_lookaside (krb5_data *, krb5_data **);
void kdc_insert_lookaside (krb5_data *, krb5_data *);
@@ -191,4 +199,8 @@ void enable_v4_crossrealm(char *);
((X) == ADDRTYPE_INET ? AF_INET : -1)
#endif
+/* RFC 4120: KRB5KDC_ERR_KEY_TOO_WEAK
+ * RFC 4556: KRB5KDC_ERR_DH_KEY_PARAMETERS_NOT_ACCEPTED */
+#define KRB5KDC_ERR_KEY_TOO_WEAK KRB5KDC_ERR_DH_KEY_PARAMETERS_NOT_ACCEPTED
+
#endif /* __KRB5_KDC_UTIL__ */
--- krb5/src/lib/krb5/os/init_os_ctx.c
+++ krb5/src/lib/krb5/os/init_os_ctx.c
@@ -391,6 +391,8 @@ krb5_os_init_context(krb5_context ctx, k
ctx->vtbl = 0;
PLUGIN_DIR_INIT(&ctx->libkrb5_plugins);
+ PLUGIN_DIR_INIT(&ctx->preauth_plugins);
+ ctx->preauth_context = NULL;
retval = os_init_paths(ctx, kdc);
/*
@@ -492,6 +494,11 @@ krb5_os_free_context(krb5_context ctx)
ctx->profile = 0;
}
+ if (ctx->preauth_context) {
+ krb5_free_preauth_context(ctx);
+ ctx->preauth_context = NULL;
+ }
+ krb5int_close_plugin_dirs (&ctx->preauth_plugins);
krb5int_close_plugin_dirs (&ctx->libkrb5_plugins);
#ifdef _WIN32
--- krb5/src/lib/krb5/krb/init_ctx.c
+++ krb5/src/lib/krb5/krb/init_ctx.c
@@ -97,7 +97,7 @@ krb5_init_secure_context(krb5_context *c
return init_common (context, TRUE, FALSE);
}
-krb5_error_code KRB5_CALLCONV
+krb5_error_code
krb5int_init_context_kdc(krb5_context *context)
{
return init_common (context, FALSE, TRUE);
@@ -272,6 +272,8 @@ krb5_free_context(krb5_context ctx)
ctx->ser_ctx = 0;
}
+ krb5_clear_error_message(ctx);
+
ctx->magic = 0;
free(ctx);
}
@@ -534,6 +536,9 @@ krb5_copy_context(krb5_context ctx, krb5
nctx->prompt_types = NULL;
nctx->os_context->default_ccname = NULL;
+ memset(&nctx->preauth_plugins, 0, sizeof(nctx->preauth_plugins));
+ nctx->preauth_context = NULL;
+
memset(&nctx->libkrb5_plugins, 0, sizeof(nctx->libkrb5_plugins));
nctx->vtbl = NULL;
nctx->locate_fptrs = NULL;
--- krb5/src/lib/krb5/krb/preauth2.c 2005-01-17 12:32:26.000000000 -0500
+++ krb5/src/lib/krb5/krb/preauth2.c
@@ -30,6 +30,18 @@
*/
#include "k5-int.h"
+#include "osconf.h"
+#include <krb5/preauth_plugin.h>
+
+#if !defined(_WIN32)
+#include <unistd.h>
+#endif
+
+#if TARGET_OS_MAC
+static const char *objdirs[] = { KRB5_PLUGIN_BUNDLE_DIR, LIBDIR "/krb5/plugins/preauth", NULL }; /* should be a list */
+#else
+static const char *objdirs[] = { LIBDIR "/krb5/plugins/preauth", NULL };
+#endif
typedef krb5_error_code (*pa_function)(krb5_context,
krb5_kdc_req *request,
@@ -49,8 +61,458 @@ typedef struct _pa_types_t {
int flags;
} pa_types_t;
-#define PA_REAL 0x0001
-#define PA_INFO 0x0002
+/* Create the per-krb5_context context. This means loading the modules
+ * if we haven't done that yet (applications which never obtain initial
+ * credentials should never hit this routine), breaking up the module's
+ * list of support pa_types so that we can iterate over the modules more
+ * easily, and copying over the relevant parts of the module's table. */
+void KRB5_CALLCONV
+krb5_init_preauth_context(krb5_context kcontext)
+{
+ int n_modules, n_tables, i, j, k;
+ void **tables;
+ struct krb5plugin_preauth_client_ftable_v0 *table;
+ krb5_preauth_context *context = NULL;
+ void *plugin_context;
+ krb5_preauthtype pa_type;
+ void **rcpp;
+
+ /* Only do this once for each krb5_context */
+ if (kcontext->preauth_context != NULL)
+ return;
+
+ /* load the plugins for the current context */
+ if (PLUGIN_DIR_OPEN(&kcontext->preauth_plugins) == 0) {
+ if (krb5int_open_plugin_dirs(objdirs, NULL,
+ &kcontext->preauth_plugins,
+ &kcontext->err) != 0) {
+ return;
+ }
+ }
+
+ /* pull out the module function tables for all of the modules */
+ tables = NULL;
+ if (krb5int_get_plugin_dir_data(&kcontext->preauth_plugins,
+ "preauthentication_client_0_backport_1_6",
+ &tables,
+ &kcontext->err) != 0) {
+ return;
+ }
+ if (tables == NULL) {
+ return;
+ }
+
+ /* count how many modules we ended up loading, and how many preauth
+ * types we may claim to support as a result */
+ n_modules = 0;
+ for (n_tables = 0;
+ (tables != NULL) && (tables[n_tables] != NULL);
+ n_tables++) {
+ table = tables[n_tables];
+ if ((table->pa_type_list != NULL) && (table->process != NULL)) {
+ for (j = 0; table->pa_type_list[j] > 0; j++) {
+ n_modules++;
+ }
+ }
+ }
+
+ /* allocate the space we need */
+ context = malloc(sizeof(*context));
+ if (context == NULL) {
+ krb5int_free_plugin_dir_data(tables);
+ return;
+ }
+ context->modules = malloc(sizeof(context->modules[0]) * n_modules);
+ if (context->modules == NULL) {
+ krb5int_free_plugin_dir_data(tables);
+ free(context);
+ return;
+ }
+ memset(context->modules, 0, sizeof(context->modules[0]) * n_modules);
+ context->n_modules = n_modules;
+
+ /* fill in the structure */
+ k = 0;
+ for (i = 0; i < n_tables; i++) {
+ table = tables[i];
+ if ((table->pa_type_list != NULL) && (table->process != NULL)) {
+ plugin_context = NULL;
+ if ((table->init != NULL) &&
+ ((*table->init)(kcontext, &plugin_context) != 0)) {
+#ifdef DEBUG
+ fprintf (stderr, "init err, skipping module \"%s\"\n",
+ table->name);
+#endif
+ continue;
+ }
+
+ rcpp = NULL;
+ for (j = 0; table->pa_type_list[j] > 0; j++) {
+ pa_type = table->pa_type_list[j];
+ context->modules[k].pa_type = pa_type;
+ context->modules[k].enctypes = table->enctype_list;
+ context->modules[k].plugin_context = plugin_context;
+ /* Only call client_fini once per plugin */
+ if (j == 0)
+ context->modules[k].client_fini = table->fini;
+ else
+ context->modules[k].client_fini = NULL;
+ context->modules[k].ftable = table;
+ context->modules[k].name = table->name;
+ context->modules[k].flags = (*table->flags)(kcontext, pa_type);
+ context->modules[k].use_count = 0;
+ context->modules[k].client_process = table->process;
+ context->modules[k].client_tryagain = table->tryagain;
+ context->modules[k].request_context = NULL;
+ /*
+ * Only call request_init and request_fini once per plugin.
+ * Only the first module within each plugin will ever
+ * have request_context filled in. Every module within
+ * the plugin will have its request_context_pp pointing
+ * to that entry's request_context. That way all the
+ * modules within the plugin share the same request_context
+ */
+ if (j == 0) {
+ context->modules[k].client_req_init = table->request_init;
+ context->modules[k].client_req_fini = table->request_fini;
+ rcpp = &context->modules[k].request_context;
+ } else {
+ context->modules[k].client_req_init = NULL;
+ context->modules[k].client_req_fini = NULL;
+ }
+ context->modules[k].request_context_pp = rcpp;
+#ifdef DEBUG
+ fprintf (stderr, "init module \"%s\", pa_type %d, flag %d\n",
+ context->modules[k].name,
+ context->modules[k].pa_type,
+ context->modules[k].flags);
+#endif
+ k++;
+ }
+ }
+ }
+ krb5int_free_plugin_dir_data(tables);
+
+ /* return the result */
+ kcontext->preauth_context = context;
+}
+
+/* Zero the use counts for the modules herein. Usually used before we
+ * start processing any data from the server, at which point every module
+ * will again be able to take a crack at whatever the server sent. */
+void KRB5_CALLCONV
+krb5_clear_preauth_context_use_counts(krb5_context context)
+{
+ int i;
+ if (context->preauth_context != NULL) {
+ for (i = 0; i < context->preauth_context->n_modules; i++) {
+ context->preauth_context->modules[i].use_count = 0;
+ }
+ }
+}
+
+/* Free the per-krb5_context preauth_context. This means clearing any
+ * plugin-specific context which may have been created, and then
+ * freeing the context itself. */
+void KRB5_CALLCONV
+krb5_free_preauth_context(krb5_context context)
+{
+ int i;
+ void *pctx;
+ if (context->preauth_context != NULL) {
+ for (i = 0; i < context->preauth_context->n_modules; i++) {
+ pctx = context->preauth_context->modules[i].plugin_context;
+ if (context->preauth_context->modules[i].client_fini != NULL) {
+ (*context->preauth_context->modules[i].client_fini)(context, pctx);
+ }
+ memset(&context->preauth_context->modules[i], 0,
+ sizeof(context->preauth_context->modules[i]));
+ }
+ if (context->preauth_context->modules != NULL) {
+ free(context->preauth_context->modules);
+ context->preauth_context->modules = NULL;
+ }
+ free(context->preauth_context);
+ context->preauth_context = NULL;
+ }
+}
+
+/* Initialize the per-AS-REQ context. This means calling the client_req_init
+ * function to give the plugin a chance to allocate a per-request context. */
+void KRB5_CALLCONV
+krb5_preauth_request_context_init(krb5_context context)
+{
+ int i;
+ void *rctx, *pctx;
+
+ /* Limit this to only one attempt per context? */
+ if (context->preauth_context == NULL)
+ krb5_init_preauth_context(context);
+ if (context->preauth_context != NULL) {
+ for (i = 0; i < context->preauth_context->n_modules; i++) {
+ pctx = context->preauth_context->modules[i].plugin_context;
+ if (context->preauth_context->modules[i].client_req_init != NULL) {
+ rctx = context->preauth_context->modules[i].request_context_pp;
+ (*context->preauth_context->modules[i].client_req_init) (context, pctx, rctx);
+ }
+ }
+ }
+}
+
+/* Free the per-AS-REQ context. This means clearing any request-specific
+ * context which the plugin may have created. */
+void KRB5_CALLCONV
+krb5_preauth_request_context_fini(krb5_context context)
+{
+ int i;
+ void *rctx, *pctx;
+ if (context->preauth_context != NULL) {
+ for (i = 0; i < context->preauth_context->n_modules; i++) {
+ pctx = context->preauth_context->modules[i].plugin_context;
+ rctx = context->preauth_context->modules[i].request_context;
+ if (rctx != NULL) {
+ if (context->preauth_context->modules[i].client_req_fini != NULL) {
+ (*context->preauth_context->modules[i].client_req_fini)(context, pctx, rctx);
+ }
+ context->preauth_context->modules[i].request_context = NULL;
+ }
+ }
+ }
+}
+
+/* Add the named encryption type to the existing list of ktypes. */
+static void
+grow_ktypes(krb5_enctype **out_ktypes, int *out_nktypes, krb5_enctype ktype)
+{
+ int i;
+ krb5_enctype *ktypes;
+ for (i = 0; i < *out_nktypes; i++) {
+ if ((*out_ktypes)[i] == ktype)
+ return;
+ }
+ ktypes = malloc((*out_nktypes + 2) * sizeof(ktype));
+ if (ktypes) {
+ for (i = 0; i < *out_nktypes; i++)
+ ktypes[i] = (*out_ktypes)[i];
+ ktypes[i++] = ktype;
+ ktypes[i] = 0;
+ free(*out_ktypes);
+ *out_ktypes = ktypes;
+ *out_nktypes = i;
+ }
+}
+
+/* Add the given pa_data item to the list of items. Factored out here to make
+ * reading the do_preauth logic easier to read. */
+static int
+grow_pa_list(krb5_pa_data ***out_pa_list, int *out_pa_list_size,
+ krb5_pa_data *addition)
+{
+ krb5_pa_data **pa_list;
+ int i;
+
+ if (out_pa_list == NULL) {
+ return EINVAL;
+ }
+
+ if (*out_pa_list == NULL) {
+ /* Allocate room for one entry and a NULL terminator. */
+ pa_list = malloc(2 * sizeof(krb5_pa_data *));
+ if (pa_list == NULL)
+ return ENOMEM;
+ pa_list[0] = addition;
+ pa_list[1] = NULL;
+ *out_pa_list = pa_list;
+ *out_pa_list_size = 1;
+ } else {
+ /* Allocate room for one more entry and a NULL terminator. */
+ pa_list = malloc((*out_pa_list_size + 2) * sizeof(krb5_pa_data *));
+ if (pa_list == NULL)
+ return ENOMEM;
+ for (i = 0; i < *out_pa_list_size; i++)
+ pa_list[i] = (*out_pa_list)[i];
+ pa_list[i++] = addition;
+ pa_list[i++] = NULL;
+ free(*out_pa_list);
+ *out_pa_list = pa_list;
+ *out_pa_list_size = i;
+ }
+ return 0;
+}
+
+/*
+ * Retrieve a specific piece of information required by the plugin and
+ * return it in a new krb5_data item. There are separate request_types
+ * to obtain the data and free it.
+ *
+ * This may require massaging data into a contrived format, but it will
+ * hopefully keep us from having to reveal library-internal functions
+ * or data to the plugin modules.
+ */
+
+static krb5_error_code
+client_data_proc(krb5_context kcontext,
+ krb5_preauth_client_rock *rock,
+ krb5_int32 request_type,
+ krb5_data **retdata)
+{
+ krb5_data *ret;
+ char *data;
+
+ if (rock->magic != CLIENT_ROCK_MAGIC)
+ return EINVAL;
+ if (retdata == NULL)
+ return EINVAL;
+
+ switch (request_type) {
+ case krb5plugin_preauth_client_get_etype:
+ {
+ krb5_enctype *eptr;
+ if (rock->as_reply == NULL)
+ return ENOENT;
+ ret = malloc(sizeof(krb5_data));
+ if (ret == NULL)
+ return ENOMEM;
+ data = malloc(sizeof(krb5_enctype));
+ if (data == NULL) {
+ free(ret);
+ return ENOMEM;
+ }
+ ret->data = data;
+ ret->length = sizeof(krb5_enctype);
+ eptr = (krb5_enctype *)data;
+ *eptr = rock->as_reply->enc_part.enctype;
+ *retdata = ret;
+ return 0;
+ }
+ break;
+ case krb5plugin_preauth_client_free_etype:
+ ret = *retdata;
+ if (ret == NULL)
+ return 0;
+ if (ret->data)
+ free(ret->data);
+ free(ret);
+ return 0;
+ break;
+ default:
+ return EINVAL;
+ }
+}
+
+/* Tweak the request body, for now adding any enctypes which the module claims
+ * to add support for to the list, but in the future perhaps doing more
+ * involved things. */
+void KRB5_CALLCONV
+krb5_preauth_prepare_request(krb5_context kcontext,
+ krb5_get_init_creds_opt *options,
+ krb5_kdc_req *request)
+{
+ int i, j;
+
+ if (kcontext->preauth_context == NULL) {
+ return;
+ }
+ /* Add the module-specific enctype list to the request, but only if
+ * it's something we can safely modify. */
+ if (!(options && (options->flags & KRB5_GET_INIT_CREDS_OPT_ETYPE_LIST))) {
+ for (i = 0; i < kcontext->preauth_context->n_modules; i++) {
+ if (kcontext->preauth_context->modules[i].enctypes == NULL)
+ continue;
+ for (j = 0; kcontext->preauth_context->modules[i].enctypes[j] != 0; j++) {
+ grow_ktypes(&request->ktype, &request->nktypes,
+ kcontext->preauth_context->modules[i].enctypes[j]);
+ }
+ }
+ }
+}
+
+/* Find the first module which provides for the named preauth type which also
+ * hasn't had a chance to run yet (INFO modules don't count, because as a rule
+ * they don't generate preauth data), and run it. */
+static krb5_error_code
+krb5_run_preauth_plugins(krb5_context kcontext,
+ int module_required_flags,
+ krb5_kdc_req *request,
+ krb5_data *encoded_request_body,
+ krb5_data *encoded_previous_request,
+ krb5_pa_data *in_padata,
+ krb5_prompter_fct prompter,
+ void *prompter_data,
+ preauth_get_as_key_proc gak_fct,
+ krb5_data *salt,
+ krb5_data *s2kparams,
+ void *gak_data,
+ krb5_preauth_client_rock *get_data_rock,
+ krb5_keyblock *as_key,
+ krb5_pa_data ***out_pa_list,
+ int *out_pa_list_size,
+ int *module_ret,
+ int *module_flags)
+{
+ int i;
+ krb5_pa_data *out_pa_data;
+ krb5_error_code ret;
+ struct _krb5_preauth_context_module *module;
+
+ if (kcontext->preauth_context == NULL) {
+ return ENOENT;
+ }
+ /* iterate over all loaded modules */
+ for (i = 0; i < kcontext->preauth_context->n_modules; i++) {
+ module = &kcontext->preauth_context->modules[i];
+ /* skip over those which don't match the preauth type */
+ if (module->pa_type != in_padata->pa_type)
+ continue;
+ /* skip over those which don't match the flags (INFO vs REAL, mainly) */
+ if ((module->flags & module_required_flags) == 0)
+ continue;
+ /* if it's a REAL module, try to call it only once per library call */
+ if (module_required_flags & PA_REAL) {
+ if (module->use_count > 0) {
+#ifdef DEBUG
+ fprintf(stderr, "skipping already-used module \"%s\"(%d)\n",
+ module->name, module->pa_type);
+#endif
+ continue;
+ }
+ module->use_count++;
+ }
+ /* run the module's callback function */
+ out_pa_data = NULL;
+#ifdef DEBUG
+ fprintf(stderr, "using module \"%s\" (%d), flags = %d\n",
+ module->name, module->pa_type, module->flags);
+#endif
+ ret = module->client_process(kcontext,
+ module->plugin_context,
+ *module->request_context_pp,
+ client_data_proc,
+ get_data_rock,
+ request,
+ encoded_request_body,
+ encoded_previous_request,
+ in_padata,
+ prompter, prompter_data,
+ gak_fct, gak_data, salt, s2kparams,
+ as_key,
+ &out_pa_data);
+ /* Make note of the module's flags and status. */
+ *module_flags = module->flags;
+ *module_ret = ret;
+ /* Save the new preauth data item. */
+ if (out_pa_data != NULL) {
+ ret = grow_pa_list(out_pa_list, out_pa_list_size, out_pa_data);
+ if (ret != 0)
+ return ret;
+ }
+ break;
+ }
+ if (i >= kcontext->preauth_context->n_modules) {
+ return ENOENT;
+ }
+ return 0;
+}
static
krb5_error_code pa_salt(krb5_context context,
@@ -101,8 +563,8 @@ krb5_error_code pa_enc_timestamp(krb5_co
#ifdef DEBUG
fprintf (stderr, "%s:%d: salt len=%d", __FILE__, __LINE__,
salt->length);
- if (salt->length > 0)
- fprintf (stderr, " '%*s'", salt->length, salt->data);
+ if ((int) salt->length > 0)
+ fprintf (stderr, " '%.*s'", salt->length, salt->data);
fprintf (stderr, "; *etype=%d request->ktype[0]=%d\n",
*etype, request->ktype[0]);
#endif
@@ -819,15 +1281,88 @@ static const pa_types_t pa_types[] = {
},
};
-krb5_error_code
+/*
+ * If one of the modules can adjust its AS_REQ data using the contents of the
+ * err_reply, return 0. If it's the sort of correction which requires that we
+ * ask the user another question, we let the calling application deal with it.
+ */
+krb5_error_code KRB5_CALLCONV
+krb5_do_preauth_tryagain(krb5_context kcontext,
+ krb5_kdc_req *request,
+ krb5_data *encoded_request_body,
+ krb5_data *encoded_previous_request,
+ krb5_pa_data **padata,
+ krb5_pa_data ***return_padata,
+ krb5_error *err_reply,
+ krb5_data *salt, krb5_data *s2kparams,
+ krb5_enctype *etype,
+ krb5_keyblock *as_key,
+ krb5_prompter_fct prompter, void *prompter_data,
+ krb5_gic_get_as_key_fct gak_fct, void *gak_data,
+ krb5_preauth_client_rock *get_data_rock)
+{
+ krb5_error_code ret;
+ krb5_pa_data *out_padata;
+ krb5_preauth_context *context;
+ struct _krb5_preauth_context_module *module;
+ int i, j;
+ int out_pa_list_size = 0;
+
+ ret = KRB5KRB_ERR_GENERIC;
+ if (kcontext->preauth_context == NULL) {
+ return KRB5KRB_ERR_GENERIC;
+ }
+ context = kcontext->preauth_context;
+ if (context == NULL) {
+ return KRB5KRB_ERR_GENERIC;
+ }
+
+ for (i = 0; padata[i] != NULL && padata[i]->pa_type != 0; i++) {
+ out_padata = NULL;
+ for (j = 0; j < context->n_modules; j++) {
+ module = &context->modules[j];
+ if (module->pa_type != padata[i]->pa_type) {
+ continue;
+ }
+ if (module->client_tryagain == NULL) {
+ continue;
+ }
+ if ((*module->client_tryagain)(kcontext,
+ module->plugin_context,
+ *module->request_context_pp,
+ client_data_proc,
+ get_data_rock,
+ request,
+ encoded_request_body,
+ encoded_previous_request,
+ padata[i],
+ err_reply,
+ prompter, prompter_data,
+ gak_fct, gak_data, salt, s2kparams,
+ as_key,
+ &out_padata) == 0) {
+ if (out_padata != NULL) {
+ grow_pa_list(return_padata, &out_pa_list_size, out_padata);
+ return 0;
+ }
+ }
+ }
+ }
+ return ret;
+}
+
+krb5_error_code KRB5_CALLCONV
krb5_do_preauth(krb5_context context,
krb5_kdc_req *request,
+ krb5_data *encoded_request_body,
+ krb5_data *encoded_previous_request,
krb5_pa_data **in_padata, krb5_pa_data ***out_padata,
krb5_data *salt, krb5_data *s2kparams,
krb5_enctype *etype,
krb5_keyblock *as_key,
krb5_prompter_fct prompter, void *prompter_data,
- krb5_gic_get_as_key_fct gak_fct, void *gak_data)
+ krb5_gic_get_as_key_fct gak_fct, void *gak_data,
+ krb5_preauth_client_rock *get_data_rock)
{
int h, i, j, out_pa_list_size;
int seen_etype_info2 = 0;
@@ -844,9 +1379,9 @@ krb5_do_preauth(krb5_context context,
}
#ifdef DEBUG
- fprintf (stderr, "salt len=%d", salt->length);
- if (salt->length > 0)
- fprintf (stderr, " '%*s'", salt->length, salt->data);
+ fprintf (stderr, "salt len=%d", (int) salt->length);
+ if ((int) salt->length > 0)
+ fprintf (stderr, " '%.*s'", salt->length, salt->data);
fprintf (stderr, "; preauth data types:");
for (i = 0; in_padata[i]; i++) {
fprintf (stderr, " %d", in_padata[i]->pa_type);
@@ -953,7 +1488,7 @@ krb5_do_preauth(krb5_context context,
fprintf (stderr, "etype info %d: etype %d salt len=%d",
j, e->etype, e->length);
if (e->length > 0 && e->length != KRB5_ETYPE_NO_SALT)
- fprintf (stderr, " '%*s'", e->length, e->salt);
+ fprintf (stderr, " '%.*s'", e->length, e->salt);
fprintf (stderr, "\n");
}
#endif
@@ -967,9 +1502,14 @@ krb5_do_preauth(krb5_context context,
default:
;
}
- for (j=0; pa_types[j].type >= 0; j++) {
+ /* Try the internally-provided preauth type list. */
+ if (!realdone) for (j=0; pa_types[j].type >= 0; j++) {
if ((in_padata[i]->pa_type == pa_types[j].type) &&
(pa_types[j].flags & paorder[h])) {
+#ifdef DEBUG
+ fprintf (stderr, "calling internal function for pa_type "
+ "%d, flag %d\n", pa_types[j].type, paorder[h]);
+#endif
out_pa = NULL;
if ((ret = ((*pa_types[j].fct)(context, request,
@@ -980,41 +1520,54 @@ krb5_do_preauth(krb5_context context,
goto cleanup;
}
- if (out_pa) {
- if (out_pa_list == NULL) {
- if ((out_pa_list =
- (krb5_pa_data **)
- malloc(2*sizeof(krb5_pa_data *)))
- == NULL) {
- ret = ENOMEM;
- goto cleanup;
- }
- } else {
- if ((out_pa_list =
- (krb5_pa_data **)
- realloc(out_pa_list,
- (out_pa_list_size+2)*
- sizeof(krb5_pa_data *)))
- == NULL) {
- /* XXX this will leak the pointers which
- have already been allocated. oh well. */
- ret = ENOMEM;
- goto cleanup;
- }
- }
-
- out_pa_list[out_pa_list_size++] = out_pa;
+ ret = grow_pa_list(&out_pa_list, &out_pa_list_size,
+ out_pa);
+ if (ret != 0) {
+ goto cleanup;
}
if (paorder[h] == PA_REAL)
realdone = 1;
}
}
+
+ /* Try to use plugins now. */
+ if (!realdone) {
+ krb5_init_preauth_context(context);
+ if (context->preauth_context != NULL) {
+ int module_ret, module_flags;
+#ifdef DEBUG
+ fprintf (stderr, "trying modules for pa_type %d, flag %d\n",
+ in_padata[i]->pa_type, paorder[h]);
+#endif
+ ret = krb5_run_preauth_plugins(context,
+ paorder[h],
+ request,
+ encoded_request_body,
+ encoded_previous_request,
+ in_padata[i],
+ prompter,
+ prompter_data,
+ gak_fct,
+ salt, s2kparams,
+ gak_data,
+ get_data_rock,
+ as_key,
+ &out_pa_list,
+ &out_pa_list_size,
+ &module_ret,
+ &module_flags);
+ if (ret == 0) {
+ if (module_ret == 0) {
+ if (paorder[h] == PA_REAL) {
+ realdone = 1;
+ }
+ }
+ }
+ }
+ }
}
}
- if (out_pa_list)
- out_pa_list[out_pa_list_size++] = NULL;
-
*out_padata = out_pa_list;
if (etype_info)
krb5_free_etype_info(context, etype_info);
--- krb5/src/lib/krb5/krb/Makefile.in
+++ krb5/src/lib/krb5/krb/Makefile.in
@@ -6,7 +6,7 @@ RUN_SETUP = @KRB5_RUN_ENV@
PROG_LIBPATH=-L$(TOPLIBD)
PROG_RPATH=$(KRB5_LIBDIR)
LOCALINCLUDES = -I$(srcdir)/../os -I$(SRCTOP)
-DEFS=
+DEFS=-DLIBDIR=\"$(KRB5_LIBDIR)\"
##DOS##BUILDTOP = ..\..\..
##DOS##PREFIXDIR=krb
--- krb5/src/lib/krb5/krb/get_in_tkt.c 2005-08-15 20:38:17.000000000 -0400
+++ krb5/src/lib/krb5/krb/get_in_tkt.c
@@ -78,6 +78,9 @@ typedef krb5_error_code (*git_decrypt_pr
static krb5_error_code make_preauth_list (krb5_context,
krb5_preauthtype *,
int, krb5_pa_data ***);
+static krb5_error_code sort_krb5_padata_sequence(krb5_context context,
+ krb5_data *realm,
+ krb5_pa_data **padata);
/*
* This function performs 32 bit bounded addition so we can generate
@@ -105,7 +108,6 @@ static krb5_int32 krb5int_addint32 (krb5
static krb5_error_code
send_as_request(krb5_context context,
krb5_kdc_req *request,
- krb5_timestamp *time_now,
krb5_error ** ret_err_reply,
krb5_kdc_rep ** ret_as_reply,
int *use_master)
@@ -116,17 +118,16 @@ send_as_request(krb5_context context,
krb5_data reply;
char k4_version; /* same type as *(krb5_data::data) */
int tcp_only = 0;
+ krb5_timestamp time_now;
reply.data = 0;
-
- if ((retval = krb5_timeofday(context, time_now)))
- goto cleanup;
- /*
- * XXX we know they are the same size... and we should do
- * something better than just the current time
- */
- request->nonce = (krb5_int32) *time_now;
+ /* set the nonce if the caller expects us to do it */
+ if (request->nonce == 0) {
+ if ((retval = krb5_timeofday(context, &time_now)))
+ goto cleanup;
+ request->nonce = (krb5_int32) time_now;
+ }
/* encode & send to KDC */
if ((retval = encode_krb5_as_req(request, &packet)) != 0)
@@ -437,7 +438,6 @@ static const krb5_enctype get_in_tkt_enc
0
};
-
krb5_error_code KRB5_CALLCONV
krb5_get_in_tkt(krb5_context context,
const krb5_flags options,
@@ -486,6 +486,7 @@ krb5_get_in_tkt(krb5_context context,
request.kdc_options = options;
request.client = creds->client;
request.server = creds->server;
+ request.nonce = 0;
request.from = creds->times.starttime;
request.till = creds->times.endtime;
request.rtime = creds->times.renew_till;
@@ -553,7 +554,17 @@ krb5_get_in_tkt(krb5_context context,
err_reply = 0;
as_reply = 0;
- if ((retval = send_as_request(context, &request, &time_now, &err_reply,
+
+ if ((retval = krb5_timeofday(context, &time_now)))
+ goto cleanup;
+
+ /*
+ * XXX we know they are the same size... and we should do
+ * something better than just the current time
+ */
+ request.nonce = (krb5_int32) time_now;
+
+ if ((retval = send_as_request(context, &request, &err_reply,
&as_reply, &use_master)))
goto cleanup;
@@ -565,6 +576,11 @@ krb5_get_in_tkt(krb5_context context,
krb5_free_error(context, err_reply);
if (retval)
goto cleanup;
+ retval = sort_krb5_padata_sequence(context,
+ &request.server->realm,
+ padata);
+ if (retval)
+ goto cleanup;
continue;
} else {
retval = (krb5_error_code) err_reply->error
@@ -746,6 +762,79 @@ krb5_libdefault_boolean(krb5_context con
return(0);
}
+/* Sort a pa_data sequence so that types named in the "preferred_preauth_types"
+ * libdefaults entry are listed before any others. */
+static krb5_error_code
+sort_krb5_padata_sequence(krb5_context context, krb5_data *realm,
+ krb5_pa_data **padata)
+{
+ int i, j, base;
+ krb5_error_code ret;
+ const char *p;
+ long l;
+ char *q, *preauth_types = NULL;
+ krb5_pa_data *tmp;
+ int need_free_string = 1;
+
+ if ((padata == NULL) || (padata[0] == NULL)) {
+ return 0;
+ }
+
+ ret = krb5_libdefault_string(context, realm, "preferred_preauth_types",
+ &preauth_types);
+ if ((ret != 0) || (preauth_types == NULL)) {
+ /* Try to use PKINIT first. */
+ preauth_types = "17, 16, 15, 14";
+ need_free_string = 0;
+ }
+
+#ifdef DEBUG
+ fprintf (stderr, "preauth data types before sorting:");
+ for (i = 0; padata[i]; i++) {
+ fprintf (stderr, " %d", padata[i]->pa_type);
+ }
+ fprintf (stderr, "\n");
+#endif
+
+ base = 0;
+ for (p = preauth_types; *p != '\0';) {
+ /* skip whitespace to find an entry */
+ p += strspn(p, ", ");
+ if (*p != '\0') {
+ /* see if we can extract a number */
+ l = strtol(p, &q, 10);
+ if ((q != NULL) && (q > p)) {
+ /* got a valid number; search for a matchin entry */
+ for (i = base; padata[i] != NULL; i++) {
+ /* bubble the matching entry to the front of the list */
+ if (padata[i]->pa_type == l) {
+ tmp = padata[i];
+ for (j = i; j > base; j--)
+ padata[j] = padata[j - 1];
+ padata[base] = tmp;
+ base++;
+ break;
+ }
+ }
+ p = q;
+ } else {
+ break;
+ }
+ }
+ }
+ if (need_free_string)
+ free(preauth_types);
+
+#ifdef DEBUG
+ fprintf (stderr, "preauth data types after sorting:");
+ for (i = 0; padata[i]; i++)
+ fprintf (stderr, " %d", padata[i]->pa_type);
+ fprintf (stderr, "\n");
+#endif
+
+ return 0;
+}
+
krb5_error_code KRB5_CALLCONV
krb5_get_init_creds(krb5_context context,
krb5_creds *creds,
@@ -762,7 +851,8 @@ krb5_get_init_creds(krb5_context context
{
krb5_error_code ret;
krb5_kdc_req request;
- krb5_pa_data **padata;
+ krb5_data *encoded_request_body, *encoded_previous_request;
+ krb5_pa_data **preauth_to_use, **kdc_padata;
int tempint;
char *tempstr;
krb5_deltat tkt_life;
@@ -775,6 +865,7 @@ krb5_get_init_creds(krb5_context context
krb5_kdc_rep *local_as_reply;
krb5_timestamp time_now;
krb5_enctype etype = 0;
+ krb5_preauth_client_rock get_data_rock;
/* initialize everything which will be freed at cleanup */
@@ -784,19 +875,27 @@ krb5_get_init_creds(krb5_context context
request.ktype = NULL;
request.addresses = NULL;
request.padata = NULL;
- padata = NULL;
+ encoded_request_body = NULL;
+ encoded_previous_request = NULL;
+ preauth_to_use = NULL;
+ kdc_padata = NULL;
as_key.length = 0;
salt.length = 0;
salt.data = NULL;
local_as_reply = 0;
+ err_reply = NULL;
+
/*
* Set up the basic request structure
*/
request.magic = KV5M_KDC_REQ;
request.msg_type = KRB5_AS_REQ;
+ /* request.nonce is filled in when we send a request to the kdc */
+ request.nonce = 0;
+
/* request.padata is filled in later */
request.kdc_options = context->kdc_default_options;
@@ -921,7 +1020,9 @@ krb5_get_init_creds(krb5_context context
goto cleanup;
}
- /* nonce is filled in by send_as_request */
+ krb5_preauth_request_context_init(context);
+
+ /* nonce is filled in by send_as_request if we don't take care of it */
if (options && (options->flags & KRB5_GET_INIT_CREDS_OPT_ETYPE_LIST)) {
request.ktype = options->etype_list;
@@ -960,8 +1061,8 @@ krb5_get_init_creds(krb5_context context
if (options && (options->flags & KRB5_GET_INIT_CREDS_OPT_PREAUTH_LIST)) {
if ((ret = make_preauth_list(context, options->preauth_list,
- options->preauth_list_length,
- &padata)))
+ options->preauth_list_length,
+ &preauth_to_use)))
goto cleanup;
}
@@ -975,44 +1076,118 @@ krb5_get_init_creds(krb5_context context
salt.data = NULL;
}
- /* now, loop processing preauth data and talking to the kdc */
+ /* set the request nonce */
+ if ((ret = krb5_timeofday(context, &time_now)))
+ goto cleanup;
+ /*
+ * XXX we know they are the same size... and we should do
+ * something better than just the current time
+ */
+ request.nonce = (krb5_int32) time_now;
+
+ /* give the preauth plugins a chance to prep the request body */
+ krb5_preauth_prepare_request(context, options, &request);
+ ret = encode_krb5_kdc_req_body(&request, &encoded_request_body);
+ if (ret)
+ goto cleanup;
+
+ get_data_rock.magic = CLIENT_ROCK_MAGIC;
+ get_data_rock.as_reply = NULL;
+
+ /* now, loop processing preauth data and talking to the kdc */
for (loopcount = 0; loopcount < MAX_IN_TKT_LOOPS; loopcount++) {
if (request.padata) {
krb5_free_pa_data(context, request.padata);
request.padata = NULL;
}
+ if (!err_reply) {
+ /* either our first attempt, or retrying after PREAUTH_NEEDED */
+ if ((ret = krb5_do_preauth(context,
+ &request,
+ encoded_request_body,
+ encoded_previous_request,
+ preauth_to_use, &request.padata,
+ &salt, &s2kparams, &etype, &as_key,
+ prompter, prompter_data,
+ gak_fct, gak_data,
+ &get_data_rock)))
+ goto cleanup;
+ } else {
+ if (preauth_to_use != NULL) {
+ /*
+ * Retry after an error other than PREAUTH_NEEDED,
+ * using e-data to figure out what to change.
+ */
+ ret = krb5_do_preauth_tryagain(context,
+ &request,
+ encoded_request_body,
+ encoded_previous_request,
+ preauth_to_use, &request.padata,
+ err_reply,
+ &salt, &s2kparams, &etype,
+ &as_key,
+ prompter, prompter_data,
+ gak_fct, gak_data,
+ &get_data_rock);
+ } else {
+ /* No preauth supplied, so can't query the plug-ins. */
+ ret = KRB5KRB_ERR_GENERIC;
+ }
+ if (ret) {
+ /* couldn't come up with anything better */
+ ret = err_reply->error + ERROR_TABLE_BASE_krb5;
+ }
+ krb5_free_error(context, err_reply);
+ err_reply = NULL;
+ if (ret)
+ goto cleanup;
+ }
- if ((ret = krb5_do_preauth(context, &request,
- padata, &request.padata,
- &salt, &s2kparams, &etype, &as_key, prompter,
- prompter_data, gak_fct, gak_data)))
+ if (encoded_previous_request != NULL) {
+ krb5_free_data(context, encoded_previous_request);
+ encoded_previous_request = NULL;
+ }
+ ret = encode_krb5_as_req(&request, &encoded_previous_request);
+ if (ret)
goto cleanup;
- if (padata) {
- krb5_free_pa_data(context, padata);
- padata = 0;
- }
-
err_reply = 0;
local_as_reply = 0;
- if ((ret = send_as_request(context, &request, &time_now, &err_reply,
+ if ((ret = send_as_request(context, &request, &err_reply,
&local_as_reply, use_master)))
goto cleanup;
if (err_reply) {
if (err_reply->error == KDC_ERR_PREAUTH_REQUIRED &&
err_reply->e_data.length > 0) {
+ /* reset the list of preauth types to try */
+ if (preauth_to_use) {
+ krb5_free_pa_data(context, preauth_to_use);
+ preauth_to_use = NULL;
+ }
ret = decode_krb5_padata_sequence(&err_reply->e_data,
- &padata);
+ &preauth_to_use);
krb5_free_error(context, err_reply);
+ err_reply = NULL;
+ if (ret)
+ goto cleanup;
+ ret = sort_krb5_padata_sequence(context,
+ &request.server->realm,
+ preauth_to_use);
if (ret)
goto cleanup;
+ /* continue to next iteration */
} else {
- ret = (krb5_error_code) err_reply->error
- + ERROR_TABLE_BASE_krb5;
- krb5_free_error(context, err_reply);
- goto cleanup;
+ if (err_reply->e_data.length > 0) {
+ /* continue to next iteration */
+ } else {
+ /* error + no hints = give up */
+ ret = (krb5_error_code) err_reply->error
+ + ERROR_TABLE_BASE_krb5;
+ krb5_free_error(context, err_reply);
+ goto cleanup;
+ }
}
} else if (local_as_reply) {
break;
@@ -1028,16 +1203,20 @@ krb5_get_init_creds(krb5_context context
}
/* process any preauth data in the as_reply */
-
- if ((ret = krb5_do_preauth(context, &request,
- local_as_reply->padata, &padata,
+ krb5_clear_preauth_context_use_counts(context);
+ if ((ret = sort_krb5_padata_sequence(context, &request.server->realm,
+ local_as_reply->padata)))
+ goto cleanup;
+ get_data_rock.as_reply = local_as_reply;
+ if ((ret = krb5_do_preauth(context,
+ &request,
+ encoded_request_body, encoded_previous_request,
+ local_as_reply->padata, &kdc_padata,
&salt, &s2kparams, &etype, &as_key, prompter,
- prompter_data, gak_fct, gak_data)))
+ prompter_data, gak_fct, gak_data,
+ &get_data_rock)))
goto cleanup;
- /* XXX if there's padata on output, something is wrong, but it's
- not obviously an error */
-
/* XXX For 1.1.1 and prior KDC's, when SAM is used w/ USE_SAD_AS_KEY,
the AS_REP comes back encrypted in the user's longterm key
instead of in the SAD. If there was a SAM preauth, there
@@ -1090,6 +1269,15 @@ krb5_get_init_creds(krb5_context context
ret = 0;
cleanup:
+ krb5_preauth_request_context_fini(context);
+ if (encoded_previous_request != NULL) {
+ krb5_free_data(context, encoded_previous_request);
+ encoded_previous_request = NULL;
+ }
+ if (encoded_request_body != NULL) {
+ krb5_free_data(context, encoded_request_body);
+ encoded_request_body = NULL;
+ }
if (request.server)
krb5_free_principal(context, request.server);
if (request.ktype &&
@@ -1099,8 +1287,10 @@ cleanup:
(!(options &&
(options->flags & KRB5_GET_INIT_CREDS_OPT_ADDRESS_LIST))))
krb5_free_addresses(context, request.addresses);
- if (padata)
- krb5_free_pa_data(context, padata);
+ if (preauth_to_use)
+ krb5_free_pa_data(context, preauth_to_use);
+ if (kdc_padata)
+ krb5_free_pa_data(context, kdc_padata);
if (request.padata)
krb5_free_pa_data(context, request.padata);
if (as_key.length)
--- krb5/src/lib/krb5/error_tables/krb5_err.et
+++ krb5/src/lib/krb5/error_tables/krb5_err.et
@@ -103,26 +103,26 @@ error_code KRB5PLACEHOLD_58, "KRB5 error
error_code KRB5PLACEHOLD_59, "KRB5 error code 59"
error_code KRB5KRB_ERR_GENERIC, "Generic error (see e-text)"
error_code KRB5KRB_ERR_FIELD_TOOLONG, "Field is too long for this implementation"
-error_code KRB5PLACEHOLD_62, "KRB5 error code 62"
-error_code KRB5PLACEHOLD_63, "KRB5 error code 63"
-error_code KRB5PLACEHOLD_64, "KRB5 error code 64"
-error_code KRB5PLACEHOLD_65, "KRB5 error code 65"
-error_code KRB5PLACEHOLD_66, "KRB5 error code 66"
+error_code KRB5KDC_ERR_CLIENT_NOT_TRUSTED, "Client not trusted"
+error_code KRB5KDC_ERR_KDC_NOT_TRUSTED, "KDC not trusted"
+error_code KRB5KDC_ERR_INVALID_SIG, "Invalid signature"
+error_code KRB5KDC_ERR_DH_KEY_PARAMETERS_NOT_ACCEPTED, "Key parameters not accepted"
+error_code KRB5KDC_ERR_CERTIFICATE_MISMATCH, "Certificate mismatch"
error_code KRB5PLACEHOLD_67, "KRB5 error code 67"
error_code KRB5PLACEHOLD_68, "KRB5 error code 68"
error_code KRB5PLACEHOLD_69, "KRB5 error code 69"
-error_code KRB5PLACEHOLD_70, "KRB5 error code 70"
-error_code KRB5PLACEHOLD_71, "KRB5 error code 71"
-error_code KRB5PLACEHOLD_72, "KRB5 error code 72"
-error_code KRB5PLACEHOLD_73, "KRB5 error code 73"
-error_code KRB5PLACEHOLD_74, "KRB5 error code 74"
-error_code KRB5PLACEHOLD_75, "KRB5 error code 75"
-error_code KRB5PLACEHOLD_76, "KRB5 error code 76"
-error_code KRB5PLACEHOLD_77, "KRB5 error code 77"
-error_code KRB5PLACEHOLD_78, "KRB5 error code 78"
-error_code KRB5PLACEHOLD_79, "KRB5 error code 79"
-error_code KRB5PLACEHOLD_80, "KRB5 error code 80"
-error_code KRB5PLACEHOLD_81, "KRB5 error code 81"
+error_code KRB5KDC_ERR_CANT_VERIFY_CERTIFICATE, "Can't verify certificate"
+error_code KRB5KDC_ERR_INVALID_CERTIFICATE, "Invalid certificate"
+error_code KRB5KDC_ERR_REVOKED_CERTIFICATE, "Revoked certificate"
+error_code KRB5KDC_ERR_REVOCATION_STATUS_UNKNOWN, "Revocation status unknown"
+error_code KRB5KDC_ERR_REVOCATION_STATUS_UNAVAILABLE, "Revocation status unavailable"
+error_code KRB5KDC_ERR_CLIENT_NAME_MISMATCH, "Client name mismatch"
+error_code KRB5KDC_ERR_KDC_NAME_MISMATCH, "KDC name mismatch"
+error_code KRB5KDC_ERR_INCONSISTENT_KEY_PURPOSE, "Inconsistent key purpose"
+error_code KRB5KDC_ERR_DIGEST_IN_CERT_NOT_ACCEPTED, "Digest in certificate not accepted"
+error_code KRB5KDC_ERR_PA_CHECKSUM_MUST_BE_INCLUDED, "Checksum must be included"
+error_code KRB5KDC_ERR_DIGEST_IN_SIGNED_DATA_NOT_ACCEPTED, "Digest in signed-data not accepted"
+error_code KRB5KDC_ERR_PUBLIC_KEY_ENCRYPTION_NOT_SUPPORTED, "Public key encryption not supported"
error_code KRB5PLACEHOLD_82, "KRB5 error code 82"
error_code KRB5PLACEHOLD_83, "KRB5 error code 83"
error_code KRB5PLACEHOLD_84, "KRB5 error code 84"
--- krb5/src/include/k5-int.h
+++ krb5/src/include/k5-int.h
@@ -835,6 +835,90 @@ error(MIT_DES_KEYSIZE does not equal KRB
#ifndef KRB5_PREAUTH__
#define KRB5_PREAUTH__
+#include <krb5/preauth_plugin.h>
+
+#define CLIENT_ROCK_MAGIC 0x4352434b
+/* This structure is passed into the client preauth functions and passed
+ * back to the "get_data_proc" function so that it can locate the
+ * requested information. It is opaque to the plugin code and can be
+ * expanded in the future as new types of requests are defined which
+ * may require other things to be passed through. */
+typedef struct _krb5_preauth_client_rock {
+ krb5_magic magic;
+ krb5_kdc_rep *as_reply;
+} krb5_preauth_client_rock;
+
+/* This structure lets us keep track of all of the modules which are loaded,
+ * turning the list of modules and their lists of implemented preauth types
+ * into a single list which we can walk easily. */
+typedef struct _krb5_preauth_context {
+ int n_modules;
+ struct _krb5_preauth_context_module {
+ /* Which of the possibly more than one preauth types which the
+ * module supports we're using at this point in the list. */
+ krb5_preauthtype pa_type;
+ /* Encryption types which the client claims to support -- we
+ * copy them directly into the krb5_kdc_req structure during
+ * krb5_preauth_prepare_request(). */
+ krb5_enctype *enctypes;
+ /* The plugin's per-plugin context and a function to clear it. */
+ void *plugin_context;
+ void (*client_fini)(krb5_context context, void *plugin_context);
+ /* The module's table, and some of its members, copied here for
+ * convenience when we populated the list. */
+ struct krb5plugin_preauth_client_ftable_v0 *ftable;
+ const char *name;
+ int flags, use_count;
+ krb5_error_code (*client_process)(krb5_context context,
+ void *plugin_context,
+ void *request_context,
+ preauth_get_client_data_proc get_data_proc,
+ krb5_preauth_client_rock *rock,
+ krb5_kdc_req *request,
+ krb5_data *encoded_request_body,
+ krb5_data *encoded_previous_request,
+ krb5_pa_data *pa_data,
+ krb5_prompter_fct prompter,
+ void *prompter_data,
+ preauth_get_as_key_proc gak_fct,
+ void *gak_data,
+ krb5_data *salt,
+ krb5_data *s2kparams,
+ krb5_keyblock *as_key,
+ krb5_pa_data **out_pa_data);
+ krb5_error_code (*client_tryagain)(krb5_context context,
+ void *plugin_context,
+ void *request_context,
+ preauth_get_client_data_proc get_data_proc,
+ krb5_preauth_client_rock *rock,
+ krb5_kdc_req *request,
+ krb5_data *encoded_request_body,
+ krb5_data *encoded_previous_request,
+ krb5_pa_data *old_pa_data,
+ krb5_error *err_reply,
+ krb5_prompter_fct prompter,
+ void *prompter_data,
+ preauth_get_as_key_proc gak_fct,
+ void *gak_data,
+ krb5_data *salt,
+ krb5_data *s2kparams,
+ krb5_keyblock *as_key,
+ krb5_pa_data **new_pa_data);
+ void (*client_req_init)(krb5_context context, void *plugin_context,
+ void **request_context);
+ void (*client_req_fini)(krb5_context context, void *plugin_context,
+ void *request_context);
+ /* The per-request context which the client_req_init() function
+ * might allocate, which we'll need to clean up later by
+ * calling the client_req_fini() function. */
+ void *request_context;
+ /* A pointer to the request_context pointer. All modules within
+ * a plugin will point at the request_context of the first
+ * module within the plugin. */
+ void **request_context_pp;
+ } *modules;
+} krb5_preauth_context;
+
typedef struct _krb5_pa_enc_ts {
krb5_timestamp patimestamp;
krb5_int32 pausec;
@@ -961,14 +1045,41 @@ void krb5int_populate_gic_opt (
krb5_preauthtype *pre_auth_types, krb5_creds *creds);
-krb5_error_code krb5_do_preauth
-(krb5_context, krb5_kdc_req *,
- krb5_pa_data **, krb5_pa_data ***,
- krb5_data *salt, krb5_data *s2kparams,
- krb5_enctype *,
- krb5_keyblock *,
- krb5_prompter_fct, void *,
- krb5_gic_get_as_key_fct, void *);
+krb5_error_code KRB5_CALLCONV krb5_do_preauth
+ (krb5_context context,
+ krb5_kdc_req *request,
+ krb5_data *encoded_request_body,
+ krb5_data *encoded_previous_request,
+ krb5_pa_data **in_padata, krb5_pa_data ***out_padata,
+ krb5_data *salt, krb5_data *s2kparams,
+ krb5_enctype *etype, krb5_keyblock *as_key,
+ krb5_prompter_fct prompter, void *prompter_data,
+ krb5_gic_get_as_key_fct gak_fct, void *gak_data,
+ krb5_preauth_client_rock *get_data_rock);
+krb5_error_code KRB5_CALLCONV krb5_do_preauth_tryagain
+ (krb5_context context,
+ krb5_kdc_req *request,
+ krb5_data *encoded_request_body,
+ krb5_data *encoded_previous_request,
+ krb5_pa_data **in_padata, krb5_pa_data ***out_padata,
+ krb5_error *err_reply,
+ krb5_data *salt, krb5_data *s2kparams,
+ krb5_enctype *etype, krb5_keyblock *as_key,
+ krb5_prompter_fct prompter, void *prompter_data,
+ krb5_gic_get_as_key_fct gak_fct, void *gak_data,
+ krb5_preauth_client_rock *get_data_rock);
+void KRB5_CALLCONV krb5_init_preauth_context
+ (krb5_context);
+void KRB5_CALLCONV krb5_free_preauth_context
+ (krb5_context);
+void KRB5_CALLCONV krb5_clear_preauth_context_use_counts
+ (krb5_context);
+void KRB5_CALLCONV krb5_preauth_prepare_request
+ (krb5_context, krb5_get_init_creds_opt *, krb5_kdc_req *);
+void KRB5_CALLCONV krb5_preauth_request_context_init
+ (krb5_context);
+void KRB5_CALLCONV krb5_preauth_request_context_fini
+ (krb5_context);
void KRB5_CALLCONV krb5_free_sam_challenge
(krb5_context, krb5_sam_challenge * );
@@ -1059,6 +1174,10 @@ struct _krb5_context {
struct krb5plugin_service_locate_ftable *vtbl;
void (**locate_fptrs)(void);
+ /* preauth module stuff */
+ struct plugin_dir_handle preauth_plugins;
+ krb5_preauth_context *preauth_context;
+
/* error detail info */
struct errinfo err;
};
--- krb5/src/include/kdb.h
+++ krb5/src/include/kdb.h
@@ -171,6 +171,7 @@ typedef struct __krb5_key_salt_tuple {
#define KRB5_TL_SECURID_STATE 0x0006
#define KRB5_TL_DB_ARGS 0x7fff
#endif /* SECURID */
+#define KRB5_TL_USER_CERTIFICATE 0x0007
/*
* Determines the number of failed KDC requests before DISALLOW_ALL_TIX is set
--- /dev/null 2007-01-10 09:59:42.964619257 -0500
+++ krb5/src/include/krb5/preauth_plugin.h
@@ -0,0 +1,326 @@
+/*
+ * <krb5/preauth_plugin.h>
+ *
+ * Copyright (c) 2006 Red Hat, Inc.
+ * Portions copyright (c) 2006 Massachusetts Institute of Technology
+ * All Rights Reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * 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.
+ * * Neither the name of Red Hat, Inc., 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 COPYRIGHT HOLDERS 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 COPYRIGHT OWNER
+ * 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.
+ *
+ * Preauthentication plugin definitions for Kerberos 5.
+ */
+
+#ifndef KRB5_PREAUTH_PLUGIN_H_INCLUDED
+#define KRB5_PREAUTH_PLUGIN_H_INCLUDED
+#include <krb5/krb5.h>
+
+/*
+ * While arguments of these types are passed-in, for the most part a preauth
+ * module can treat them as opaque. If we need keying data, we can ask for
+ * it directly.
+ */
+struct _krb5_db_entry_new;
+struct _krb5_key_data;
+struct _krb5_preauth_client_rock;
+
+/*
+ * Preauth mechanism property flags, unified from previous definitions in the
+ * KDC and libkrb5 sources.
+ */
+
+/* Provides a real answer which we can send back to the KDC (client-only). The
+ * client assumes that one real answer will be enough. */
+#define PA_REAL 0x00000001
+
+/* Doesn't provide a real answer, but must be given a chance to run before any
+ * REAL mechanism callbacks (client-only). */
+#define PA_INFO 0x00000002
+
+/* Causes the KDC to include this mechanism in a list of supported preauth
+ * types if the user's DB entry flags the user as requiring hardware-based
+ * preauthentication (server-only). */
+#define PA_HARDWARE 0x00000004
+
+/* Causes the KDC to include this mechanism in a list of supported preauth
+ * types if the user's DB entry flags the user as requiring preauthentication,
+ * and to fail preauthentication if we can't verify the client data. The
+ * flipside of PA_SUFFICIENT (server-only). */
+#define PA_REQUIRED 0x00000008
+
+/* Causes the KDC to include this mechanism in a list of supported preauth
+ * types if the user's DB entry flags the user as requiring preauthentication,
+ * and to mark preauthentication as successful if we can verify the client
+ * data. The flipside of PA_REQUIRED (server-only). */
+#define PA_SUFFICIENT 0x00000010
+
+/* Marks this preauthentication mechanism as one which changes the key which is
+ * used for encrypting the response to the client. Modules which have this
+ * flag have their server_return_proc called before modules which do not, and
+ * are passed over if a previously-called module has modified the encrypting
+ * key (server-only). */
+#define PA_REPLACES_KEY 0x00000020
+
+/* Causes the KDC to check with this preauthentication module even if the
+ * client has no entry in the realm database. If the module returns a success
+ * code, continue processing and assume that its return_padata callback will
+ * supply us with a key for encrypting the AS reply (server-only). */
+/* #define PA_VIRTUAL (0x00000040 | PA_REPLACES_KEY) */
+
+/* Not really a padata type, so don't include it in any list of preauth types
+ * which gets sent over the wire. */
+#define PA_PSEUDO 0x00000080
+
+/*
+ * A server module's callback functions are allowed to request specific types
+ * of information about the given client or server record or request, even
+ * though the database records themselves are opaque to the module.
+ */
+enum krb5plugin_preauth_entry_request_type {
+ /* The returned krb5_data item holds a DER-encoded X.509 certificate. */
+ krb5plugin_preauth_entry_request_certificate = 1,
+ /* The returned krb5_data_item holds a krb5_deltat. */
+ krb5plugin_preauth_entry_max_time_skew = 2,
+ /* The returned krb5_data_item holds an array of krb5_keyblock structures,
+ * terminated by an entry with key type = 0.
+ * Each keyblock should have its contents freed in turn, and then the data
+ * item itself should be freed. */
+ krb5plugin_preauth_keys = 3,
+ /* The returned krb5_data_item holds the request structure, re-encoded
+ * using DER. Unless the client implementation is the same as the server
+ * implementation, there's a good chance that the result will not match
+ * what the client sent, so don't go creating any fatal errors if it
+ * doesn't match up. */
+ krb5plugin_preauth_request_body = 4
+};
+typedef krb5_error_code
+(*preauth_get_entry_data_proc)(krb5_context,
+ krb5_kdc_req *,
+ struct _krb5_db_entry_new *,
+ krb5_int32 request_type,
+ krb5_data **);
+
+/*
+ * A client module's callback functions are allowed to request various
+ * information to enable it to process a request.
+ */
+enum krb5plugin_preauth_client_request_type {
+ /* The returned krb5_data item holds the enctype used to encrypt the
+ * encrypted portion of the AS_REP packet. */
+ krb5plugin_preauth_client_get_etype = 1,
+ /* Free the data returned from krb5plugin_preauth_client_req_get_etype */
+ krb5plugin_preauth_client_free_etype = 2
+};
+typedef krb5_error_code
+(*preauth_get_client_data_proc)(krb5_context,
+ struct _krb5_preauth_client_rock *,
+ krb5_int32 request_type,
+ krb5_data **);
+
+/*
+ * A callback which will obtain the user's long-term AS key by prompting the
+ * user for the password, then salting it properly, and so on. For the moment,
+ * it's identical to the get_as_key callback used inside of libkrb5, but we
+ * define a new typedef here instead of making the existing one public to
+ * isolate ourselves from potential future changes.
+ */
+typedef krb5_error_code
+(*preauth_get_as_key_proc)(krb5_context,
+ krb5_principal,
+ krb5_enctype,
+ krb5_prompter_fct,
+ void *prompter_data,
+ krb5_data *salt,
+ krb5_data *s2kparams,
+ krb5_keyblock *as_key,
+ void *gak_data);
+
+/*
+ * The function table / structure which a preauth client module must export as
+ * "preauthentication_client_0_backport_1_6". If the interfaces work correctly, future
+ * versions of the table will add either more callbacks or more arguments to
+ * callbacks, and in both cases we'll be able to wrap the v0 functions.
+ */
+typedef struct krb5plugin_preauth_client_ftable_v0 {
+ /* Not-usually-visible name. */
+ char *name;
+
+ /* Pointer to zero-terminated list of pa_types which this module can
+ * provide services for. */
+ krb5_preauthtype *pa_type_list;
+
+ /* Pointer to zero-terminated list of enc_types which this module claims
+ * to add support for. */
+ krb5_enctype *enctype_list;
+
+ /* Per-plugin initialization/cleanup. The init function is called
+ * by libkrb5 when the plugin is loaded, and the fini function is
+ * called before the plugin is unloaded. Both are optional and
+ * may be called multiple times in case the plugin is used in
+ * multiple contexts. The returned context lives the lifetime of
+ * the krb5_context */
+ krb5_error_code (*init)(krb5_context context, void **plugin_context);
+ void (*fini)(krb5_context context, void *plugin_context);
+ /* A callback which returns flags indicating if the module is a "real" or
+ * an "info" mechanism, and so on. This function is called for each entry
+ * in the client_pa_type_list. */
+ int (*flags)(krb5_context context, krb5_preauthtype pa_type);
+ /* Per-request initialization/cleanup. The request_init function is
+ * called when beginning to process a get_init_creds request and the
+ * request_fini function is called when processing of the request is
+ * complete. This is optional. It may be called multiple times in
+ * the lifetime of a krb5_context. */
+ void (*request_init)(krb5_context context, void *plugin_context,
+ void **request_context);
+ void (*request_fini)(krb5_context context, void *plugin_context,
+ void *request_context);
+ /* Client function which processes server-supplied data in pa_data,
+ * returns created data in out_pa_data, storing any of its own state in
+ * client_context if data for the associated preauthentication type is
+ * needed. It is also called after the AS-REP is received if the AS-REP
+ * includes preauthentication data of the associated type.
+ * NOTE! the encoded_previous_request will be NULL the first time this
+ * function is called, because it is expected to only ever contain the data
+ * obtained from a previous call to this function. */
+ krb5_error_code (*process)(krb5_context context,
+ void *plugin_context,
+ void *request_context,
+ preauth_get_client_data_proc get_data_proc,
+ struct _krb5_preauth_client_rock *rock,
+ krb5_kdc_req *request,
+ krb5_data *encoded_request_body,
+ krb5_data *encoded_previous_request,
+ krb5_pa_data *pa_data,
+ krb5_prompter_fct prompter,
+ void *prompter_data,
+ preauth_get_as_key_proc gak_fct,
+ void *gak_data,
+ krb5_data *salt, krb5_data *s2kparams,
+ krb5_keyblock *as_key,
+ krb5_pa_data **out_pa_data);
+ /* Client function which can attempt to use e-data in the error response to
+ * try to recover from the given error. If this function is not NULL, and
+ * it stores data in out_pa_data which is different data from the contents
+ * of in_pa_data, then the client library will retransmit the request. */
+ krb5_error_code (*tryagain)(krb5_context context,
+ void *plugin_context,
+ void *request_context,
+ preauth_get_client_data_proc get_data_proc,
+ struct _krb5_preauth_client_rock *rock,
+ krb5_kdc_req *request,
+ krb5_data *encoded_request_body,
+ krb5_data *encoded_previous_request,
+ krb5_pa_data *in_pa_data,
+ krb5_error *error,
+ krb5_prompter_fct prompter,
+ void *prompter_data,
+ preauth_get_as_key_proc gak_fct,
+ void *gak_data,
+ krb5_data *salt, krb5_data *s2kparams,
+ krb5_keyblock *as_key,
+ krb5_pa_data **out_pa_data);
+} krb5plugin_preauth_client_ftable_v0;
+
+/*
+ * The function table / structure which a preauth server module must export as
+ * "preauthentication_server_0_backport_1_6". NOTE: replace "0" with "1" for the type and
+ * variable names if this gets picked up by upstream. If the interfaces work
+ * correctly, future versions of the table will add either more callbacks or
+ * more arguments to callbacks, and in both cases we'll be able to wrap the v0
+ * functions.
+ */
+typedef struct krb5plugin_preauth_server_ftable_v0 {
+ /* Not-usually-visible name. */
+ char *name;
+
+ /* Pointer to zero-terminated list of pa_types which this module can
+ * provide services for. */
+ krb5_preauthtype *pa_type_list;
+
+ /* Per-plugin initialization/cleanup. The init function is called by the
+ * KDC when the plugin is loaded, and the fini function is called before
+ * the plugin is unloaded. Both are optional. */
+ krb5_error_code (*init_proc)(krb5_context, void **);
+ void (*fini_proc)(krb5_context, void *);
+ /* Return the flags which the KDC should use for this module. This is a
+ * callback instead of a static value because the module may or may not
+ * wish to count itself as a hardware preauthentication module (in other
+ * words, the flags may be affected by the configuration, for example if a
+ * site administrator can force a particular preauthentication type to be
+ * supported using only hardware). This function is called for each entry
+ * entry in the server_pa_type_list. */
+ int (*flags_proc)(krb5_context, krb5_preauthtype);
+ /* Get preauthentication data to send to the client as part of the "you
+ * need to use preauthentication" error. The module doesn't need to
+ * actually provide data if the protocol doesn't require it, but it should
+ * return either zero or non-zero to control whether its padata type is
+ * included in the list which is sent back to the client. Is not allowed
+ * to create a context because we have no guarantee that the client will
+ * ever call again (or that it will hit this server if it does), in which
+ * case a context might otherwise hang around forever. */
+ krb5_error_code (*edata_proc)(krb5_context, krb5_kdc_req *request,
+ struct _krb5_db_entry_new *client,
+ struct _krb5_db_entry_new *server,
+ preauth_get_entry_data_proc,
+ void *pa_module_context,
+ krb5_pa_data *data);
+ /* Verify preauthentication data sent by the client, setting the
+ * TKT_FLG_PRE_AUTH or TKT_FLG_HW_AUTH flag in the enc_tkt_reply's "flags"
+ * field as appropriate, and returning nonzero on failure. Can create
+ * context data for consumption by the return_proc or freepa_proc below. */
+ krb5_error_code (*verify_proc)(krb5_context,
+ struct _krb5_db_entry_new *client,
+ krb5_data *req_pkt,
+ krb5_kdc_req *request,
+ krb5_enc_tkt_part *enc_tkt_reply,
+ krb5_pa_data *data,
+ preauth_get_entry_data_proc,
+ void *pa_module_context,
+ void **pa_request_context,
+ krb5_data **e_data);
+ /* Generate preauthentication response data to send to the client as part
+ * of the AS-REP. If it needs to override the key which is used to encrypt
+ * the response, it can do so. The module is expected (but not required,
+ * if a freepa_proc is also provided) to free any context data it saved in
+ * "request_pa_context". */
+ krb5_error_code (*return_proc)(krb5_context, krb5_pa_data * padata,
+ struct _krb5_db_entry_new *client,
+ krb5_data *req_pkt,
+ krb5_kdc_req *request,
+ krb5_kdc_rep *reply,
+ struct _krb5_key_data *client_keys,
+ krb5_keyblock *encrypting_key,
+ krb5_pa_data **send_pa,
+ preauth_get_entry_data_proc,
+ void *pa_module_context,
+ void **pa_request_context);
+ /* Free up the server-side per-request context, in cases where
+ * server_return_proc() didn't or for whatever reason was not called. Can
+ * be NULL. */
+ krb5_error_code (*freepa_reqcontext_proc)(krb5_context,
+ void *pa_module_context,
+ void **request_pa_context);
+} krb5plugin_preauth_server_ftable_v0;
+#endif /* KRB5_PREAUTH_PLUGIN_H_INCLUDED */
--- krb5/src/config/pre.in
+++ krb5/src/config/pre.in
@@ -194,6 +194,7 @@ prefix=@prefix@
INSTALL_PREFIX=$(prefix)
INSTALL_EXEC_PREFIX=@exec_prefix@
exec_prefix=@exec_prefix@
+datarootdir=@datarootdir@
SHLIB_TAIL_COMP=@SHLIB_TAIL_COMP@
datadir = @datadir@
@@ -212,6 +213,7 @@ KRB5_SHLIBDIR = @libdir@$(SHLIB_TAIL_COM
KRB5_INCDIR = @includedir@
MODULE_DIR = @libdir@/krb5/plugins
KRB5_DB_MODULE_DIR = $(MODULE_DIR)/kdb
+KRB5_PA_MODULE_DIR = $(MODULE_DIR)/preauth
KRB5_LIBKRB5_MODULE_DIR = $(MODULE_DIR)/libkrb5
KRB5_INCSUBDIRS = \
$(KRB5_INCDIR)/krb5 \
--- /dev/null 2007-01-10 09:59:42.964619257 -0500
+++ krb5/src/plugins/preauth/wpse/configure.in
@@ -0,0 +1,14 @@
+K5_AC_INIT(configure.in)
+enable_shared=yes
+build_dynobj=yes
+CONFIG_RULES
+
+AC_CHECK_HEADERS(errno.h string.h)
+
+KRB5_RUN_FLAGS
+dnl The following is for check...
+KRB5_BUILD_PROGRAM
+KRB5_BUILD_LIBOBJS
+KRB5_BUILD_LIBRARY_WITH_DEPS
+AC_CONFIG_HEADERS(config.h)
+V5_AC_OUTPUT_MAKEFILE
--- /dev/null 2007-01-10 09:59:42.964619257 -0500
+++ krb5/src/plugins/preauth/wpse/Makefile.in
@@ -0,0 +1,42 @@
+thisconfigdir=.
+myfulldir=plugins/preauth/wpse
+mydir=.
+BUILDTOP=$(REL)..$(S)..$(S)..
+KRB5_RUN_ENV = @KRB5_RUN_ENV@
+KRB5_CONFIG_SETUP = KRB5_CONFIG=$(SRCTOP)/config-files/krb5.conf ; export KRB5_CONFIG ;
+PROG_LIBPATH=-L$(TOPLIBD)
+PROG_RPATH=$(KRB5_LIBDIR)
+MODULE_INSTALL_DIR = $(KRB5_PA_MODULE_DIR)
+DEFS=@DEFS@
+
+LOCALINCLUDES = -I../../../include/krb5 -I.
+
+LIBBASE=wpse
+LIBMAJOR=0
+LIBMINOR=0
+SO_EXT=.so
+RELDIR=../plugins/preauth/wpse
+# Depends on libk5crypto and libkrb5
+SHLIB_EXPDEPS = \
+ $(TOPLIBD)/libk5crypto$(SHLIBEXT) \
+ $(TOPLIBD)/libkrb5$(SHLIBEXT)
+SHLIB_EXPLIBS= -lkrb5 -lcom_err -lk5crypto $(SUPPORT_LIB) $(LIBS)
+
+SHLIB_DIRS=-L$(TOPLIBD)
+SHLIB_RDIRS=$(KRB5_LIBDIR)
+STOBJLISTS=OBJS.ST
+STLIBOBJS=wpse_main.o
+
+SRCS=wpse_main.c
+
+all-unix:: $(LIBBASE)$(SO_EXT)
+install-unix:: install-libs
+clean-unix:: clean-libs clean-libobjs
+
+clean::
+ $(RM) lib$(LIBBASE)$(SO_EXT)
+
+@libnover_frag@
+@libobj_frag@
+
+# +++ Dependency line eater +++
--- /dev/null 2007-01-10 09:59:42.964619257 -0500
+++ krb5/src/plugins/preauth/wpse/wpse_main.c
@@ -0,0 +1,393 @@
+/*
+ * Copyright (C) 2006 Red Hat, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Red Hat, Inc., nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
+ * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/* Worst. Preauthentication. Scheme. Ever. */
+
+#ident "$Id$"
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#ifdef HAVE_ERRNO_H
+#include <errno.h>
+#endif
+#ifdef HAVE_STRING_H
+#include <string.h>
+#endif
+
+#include <arpa/inet.h>
+#include <stdio.h>
+
+#include <krb5/krb5.h>
+#include <krb5/preauth_plugin.h>
+
+/* This is not a standardized value. It's defined here only to make it easier
+ * to change in this module. */
+#define KRB5_PADATA_WPSE_REQ 131
+
+static int
+client_get_flags(krb5_context kcontext, krb5_preauthtype pa_type)
+{
+ return PA_REAL;
+}
+
+static krb5_error_code
+client_init(krb5_context kcontext, void **ctx)
+{
+ int *pctx;
+
+ pctx = malloc(sizeof(int));
+ if (pctx == NULL)
+ return ENOMEM;
+ *pctx = 0;
+ *ctx = pctx;
+ return 0;
+}
+
+static void
+client_fini(krb5_context kcontext, void *ctx)
+{
+ int *pctx;
+
+ pctx = ctx;
+ if (pctx) {
+#ifdef DEBUG
+ fprintf(stderr, "wpse module called total of %d times\n", *pctx);
+#endif
+ free(pctx);
+ }
+}
+
+static krb5_error_code
+client_process(krb5_context kcontext,
+ void *plugin_context,
+ void *request_context,
+ preauth_get_client_data_proc client_get_data_proc,
+ struct _krb5_preauth_client_rock *rock,
+ krb5_kdc_req *request,
+ krb5_data *encoded_request_body,
+ krb5_data *encoded_previous_request,
+ krb5_pa_data *pa_data,
+ krb5_prompter_fct prompter,
+ void *prompter_data,
+ preauth_get_as_key_proc gak_fct,
+ void *gak_data,
+ krb5_data *salt, krb5_data *s2kparams,
+ krb5_keyblock *as_key,
+ krb5_pa_data **out_pa_data)
+{
+ krb5_pa_data *send_pa;
+ krb5_int32 nnonce, enctype;
+ krb5_keyblock *kb;
+ krb5_error_code status;
+ int *pctx;
+
+#ifdef DEBUG
+ fprintf(stderr, "%d bytes of preauthentication data (type %d)\n",
+ pa_data->length, pa_data->pa_type);
+#endif
+
+ pctx = plugin_context;
+ if (pctx) {
+ (*pctx)++;
+ }
+
+ if (pa_data->length == 0) {
+ /* Create preauth data. */
+ send_pa = malloc(sizeof(krb5_pa_data));
+ if (send_pa == NULL)
+ return ENOMEM;
+ send_pa->pa_type = KRB5_PADATA_WPSE_REQ;
+ send_pa->length = 4;
+ send_pa->contents = malloc(4);
+ if (send_pa->contents == NULL) {
+ free(send_pa);
+ return ENOMEM;
+ }
+ /* Store the preauth data. */
+ nnonce = htonl(request->nonce);
+ memcpy(send_pa->contents, &nnonce, 4);
+ *out_pa_data = send_pa;
+ } else {
+ /* A reply from the KDC. Conventionally this would be
+ * indicated by a different preauthentication type, but this
+ * mechanism/implementation doesn't do that. */
+ if (pa_data->length > 4) {
+ memcpy(&enctype, pa_data->contents, 4);
+ kb = NULL;
+ status = krb5_init_keyblock(kcontext, ntohl(enctype),
+ pa_data->length - 4, &kb);
+ if (status != 0)
+ return status;
+ memcpy(kb->contents, pa_data->contents + 4, pa_data->length - 4);
+#ifdef DEBUG
+ fprintf(stderr, "Recovered key type=%d, length=%d.\n",
+ kb->enctype, kb->length);
+#endif
+ status = krb5_copy_keyblock_contents(kcontext, kb, as_key);
+ krb5_free_keyblock(kcontext, kb);
+ return status;
+ }
+ return KRB5KRB_ERR_GENERIC;
+ }
+ return 0;
+}
+
+#define WPSE_MAGIC 0x77707365
+typedef struct _wpse_req_ctx
+{
+ int magic;
+ int value;
+} wpse_req_ctx;
+
+static void
+client_req_init(krb5_context kcontext, void *plugin_context, void **req_context_p)
+{
+ wpse_req_ctx *ctx;
+
+ *req_context_p = NULL;
+
+ /* Allocate a request context. Useful for verifying that we do in fact
+ * do per-request cleanup. */
+ ctx = (wpse_req_ctx *) malloc(sizeof(*ctx));
+ if (ctx == NULL)
+ return;
+ ctx->magic = WPSE_MAGIC;
+ ctx->value = 0xc0dec0de;
+
+ *req_context_p = ctx;
+}
+
+static void
+client_req_cleanup(krb5_context kcontext, void *plugin_context, void *req_context)
+{
+ wpse_req_ctx *ctx = (wpse_req_ctx *)req_context;
+
+ if (ctx) {
+#ifdef DEBUG
+ fprintf(stderr, "client_req_cleanup: req_ctx at %p has magic %x and value %x\n",
+ ctx, ctx->magic, ctx->value);
+#endif
+ if (ctx->magic != WPSE_MAGIC) {
+#ifdef DEBUG
+ fprintf(stderr, "client_req_cleanup: req_context at %p has bad magic value %x\n",
+ ctx, ctx->magic);
+#endif
+ return;
+ }
+ free(ctx);
+ }
+ return;
+}
+
+/* Free state. */
+static krb5_error_code
+server_free_pa_request_context(krb5_context kcontext, void *plugin_context,
+ void **request_context)
+{
+ if (*request_context != NULL) {
+ free(*request_context);
+ *request_context = NULL;
+ }
+ return 0;
+}
+
+/* Obtain and return any preauthentication data (which is destined for the
+ * client) which matches type data->pa_type. */
+static krb5_error_code
+server_get_edata(krb5_context kcontext,
+ krb5_kdc_req *request,
+ struct _krb5_db_entry_new *client,
+ struct _krb5_db_entry_new *server,
+ preauth_get_entry_data_proc server_get_entry_data,
+ void *pa_module_context,
+ krb5_pa_data *data)
+{
+ /* Return zero bytes of data. */
+ data->length = 0;
+ data->contents = NULL;
+ return 0;
+}
+
+/* Verify a request from a client. */
+static krb5_error_code
+server_verify(krb5_context kcontext,
+ struct _krb5_db_entry_new *client,
+ krb5_data *req_pkt,
+ krb5_kdc_req *request,
+ krb5_enc_tkt_part *enc_tkt_reply,
+ krb5_pa_data *data,
+ preauth_get_entry_data_proc server_get_entry_data,
+ void *pa_module_context,
+ void **pa_request_context,
+ krb5_data **e_data)
+{
+ krb5_int32 nnonce;
+ krb5_data *test_edata;
+
+ /* Verify the preauth data. */
+ if (data->length != 4)
+ return KRB5KDC_ERR_PREAUTH_FAILED;
+ memcpy(&nnonce, data->contents, 4);
+ nnonce = ntohl(nnonce);
+ if (memcmp(&nnonce, &request->nonce, 4) != 0)
+ return KRB5KDC_ERR_PREAUTH_FAILED;
+ /* Note that preauthentication succeeded. */
+ enc_tkt_reply->flags |= TKT_FLG_PRE_AUTH;
+ enc_tkt_reply->flags |= TKT_FLG_HW_AUTH;
+ /* Allocate a context. Useful for verifying that we do in fact do
+ * per-request cleanup. */
+ if (*pa_request_context == NULL)
+ *pa_request_context = malloc(4);
+
+ /* Return edata to exercise code that handles edata... */
+ test_edata = malloc(sizeof(*test_edata));
+ if (test_edata != NULL) {
+ test_edata->data = malloc(20);
+ if (test_edata->data == NULL) {
+ free(test_edata);
+ } else {
+ test_edata->length = 20;
+ memset(test_edata->data, '#', 20); /* fill it with junk */
+ *e_data = test_edata;
+ }
+ }
+ return 0;
+}
+
+/* Create the response for a client. */
+static krb5_error_code
+server_return(krb5_context kcontext,
+ krb5_pa_data *padata,
+ struct _krb5_db_entry_new *client,
+ krb5_data *req_pkt,
+ krb5_kdc_req *request,
+ krb5_kdc_rep *reply,
+ struct _krb5_key_data *client_key,
+ krb5_keyblock *encrypting_key,
+ krb5_pa_data **send_pa,
+ preauth_get_entry_data_proc server_get_entry_data,
+ void *pa_module_context,
+ void **pa_request_context)
+{
+ /* This module does a couple of dumb things. It tags its reply with
+ * the same type as the initial challenge (expecting the client to sort
+ * out whether there's anything useful in there). Oh, and it replaces
+ * the AS reply key with one which is sent in the clear. */
+ krb5_keyblock *kb;
+ krb5_int32 enctype;
+ int i;
+
+ *send_pa = NULL;
+
+ /* We'll want a key with the first supported enctype. */
+ for (i = 0; i < request->nktypes; i++) {
+ kb = NULL;
+ if (krb5_init_keyblock(kcontext, request->ktype[i], 0, &kb) == 0) {
+ break;
+ }
+ }
+ if (i >= request->nktypes) {
+ /* No matching cipher type found. */
+ return 0;
+ }
+
+ /* Randomize a key and save it for the client. */
+ if (krb5_c_make_random_key(kcontext, request->ktype[i], kb) != 0) {
+ krb5_free_keyblock(kcontext, kb);
+ return 0;
+ }
+#ifdef DEBUG
+ fprintf(stderr, "Generated random key, type=%d, length=%d.\n",
+ kb->enctype, kb->length);
+#endif
+
+ *send_pa = malloc(sizeof(krb5_pa_data));
+ if (*send_pa == NULL) {
+ krb5_free_keyblock(kcontext, kb);
+ return ENOMEM;
+ }
+ (*send_pa)->pa_type = KRB5_PADATA_WPSE_REQ;
+ (*send_pa)->length = 4 + kb->length;
+ (*send_pa)->contents = malloc(4 + kb->length);
+ if ((*send_pa)->contents == NULL) {
+ free(*send_pa);
+ *send_pa = NULL;
+ krb5_free_keyblock(kcontext, kb);
+ return ENOMEM;
+ }
+
+ /* Store the preauth data. */
+ enctype = htonl(kb->enctype);
+ memcpy((*send_pa)->contents, &enctype, 4);
+ memcpy((*send_pa)->contents + 4, kb->contents, kb->length);
+ krb5_free_keyblock_contents(kcontext, encrypting_key);
+ krb5_copy_keyblock_contents(kcontext, kb, encrypting_key);
+
+ /* Clean up. */
+ krb5_free_keyblock(kcontext, kb);
+
+ return 0;
+}
+
+static int
+server_get_flags(krb5_context kcontext, krb5_preauthtype pa_type)
+{
+ return PA_HARDWARE | PA_REPLACES_KEY;
+}
+
+static krb5_preauthtype supported_client_pa_types[] = {KRB5_PADATA_WPSE_REQ, 0};
+static krb5_preauthtype supported_server_pa_types[] = {KRB5_PADATA_WPSE_REQ, 0};
+
+struct krb5plugin_preauth_client_ftable_v0 preauthentication_client_0_backport_1_6 = {
+ "wpse", /* name */
+ &supported_client_pa_types[0], /* pa_type_list */
+ NULL, /* enctype_list */
+ client_init, /* plugin init function */
+ client_fini, /* plugin fini function */
+ client_get_flags, /* get flags function */
+ client_req_init, /* request init function */
+ client_req_cleanup, /* request fini function */
+ client_process, /* process function */
+ NULL, /* try_again function */
+};
+
+struct krb5plugin_preauth_server_ftable_v0 preauthentication_server_0_backport_1_6 = {
+ "wpse",
+ &supported_server_pa_types[0],
+ NULL,
+ NULL,
+ server_get_flags,
+ server_get_edata,
+ server_verify,
+ server_return,
+ server_free_pa_request_context,
+};
--- /dev/null 2007-01-10 09:59:42.964619257 -0500
+++ krb5/src/plugins/preauth/wpse/wpse.exports
@@ -0,0 +1,2 @@
+preauthentication_client_0_backport_1_6
+preauthentication_server_0_backport_1_6
--- /dev/null 2007-01-10 09:59:42.964619257 -0500
+++ krb5/src/plugins/preauth/cksum_body/cksum_body.exports
@@ -0,0 +1,2 @@
+preauthentication_client_0_backport_1_6
+preauthentication_server_0_backport_1_6
--- /dev/null 2007-01-10 09:59:42.964619257 -0500
+++ krb5/src/plugins/preauth/cksum_body/configure.in
@@ -0,0 +1,14 @@
+K5_AC_INIT(configure.in)
+enable_shared=yes
+build_dynobj=yes
+CONFIG_RULES
+
+AC_CHECK_HEADERS(errno.h string.h)
+
+KRB5_RUN_FLAGS
+dnl The following is for check...
+KRB5_BUILD_PROGRAM
+KRB5_BUILD_LIBOBJS
+KRB5_BUILD_LIBRARY_WITH_DEPS
+AC_CONFIG_HEADERS(config.h)
+V5_AC_OUTPUT_MAKEFILE
--- /dev/null 2007-01-10 09:59:42.964619257 -0500
+++ krb5/src/plugins/preauth/cksum_body/Makefile.in
@@ -0,0 +1,42 @@
+thisconfigdir=.
+myfulldir=plugins/preauth/cksum_body
+mydir=.
+BUILDTOP=$(REL)..$(S)..$(S)..
+KRB5_RUN_ENV = @KRB5_RUN_ENV@
+KRB5_CONFIG_SETUP = KRB5_CONFIG=$(SRCTOP)/config-files/krb5.conf ; export KRB5_CONFIG ;
+PROG_LIBPATH=-L$(TOPLIBD)
+PROG_RPATH=$(KRB5_LIBDIR)
+MODULE_INSTALL_DIR = $(KRB5_PA_MODULE_DIR)
+DEFS=@DEFS@
+
+LOCALINCLUDES = -I../../../include/krb5 -I.
+
+LIBBASE=cksum_body
+LIBMAJOR=0
+LIBMINOR=0
+SO_EXT=.so
+RELDIR=../plugins/preauth/cksum_body
+# Depends on libk5crypto and libkrb5
+SHLIB_EXPDEPS = \
+ $(TOPLIBD)/libk5crypto$(SHLIBEXT) \
+ $(TOPLIBD)/libkrb5$(SHLIBEXT)
+SHLIB_EXPLIBS= -lkrb5 -lcom_err -lk5crypto $(SUPPORT_LIB) $(LIBS)
+
+SHLIB_DIRS=-L$(TOPLIBD)
+SHLIB_RDIRS=$(KRB5_LIBDIR)
+STOBJLISTS=OBJS.ST
+STLIBOBJS=cksum_body_main.o
+
+SRCS= $(srcdir)/cksum_body_main.c
+
+all-unix:: $(LIBBASE)$(SO_EXT)
+install-unix:: install-libs
+clean-unix:: clean-libs clean-libobjs
+
+clean::
+ $(RM) lib$(LIBBASE)$(SO_EXT)
+
+@libnover_frag@
+@libobj_frag@
+
+# +++ Dependency line eater +++
--- /dev/null 2007-01-10 09:59:42.964619257 -0500
+++ krb5/src/plugins/preauth/cksum_body/cksum_body_main.c
@@ -0,0 +1,521 @@
+/*
+ * Copyright (C) 2006 Red Hat, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * 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.
+ * * Neither the name of Red Hat, Inc., 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 COPYRIGHT HOLDERS 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 COPYRIGHT OWNER
+ * 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.
+ */
+
+/*
+ * Checksum the request body with the user's long-term key.
+ *
+ * The e-data from the KDC is a list of network-byte-order 32-bit integers
+ * listing key types which the KDC has for the user.
+ *
+ * The client uses one of these key types to generate a checksum over the body
+ * of the request, and includes the checksum in the AS-REQ as preauthentication
+ * data.
+ *
+ * The AS-REP carries no preauthentication data for this scheme.
+ */
+
+#ident "$Id$"
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#ifdef HAVE_ERRNO_H
+#include <errno.h>
+#endif
+#ifdef HAVE_STRING_H
+#include <string.h>
+#endif
+
+#include <arpa/inet.h>
+#include <stdio.h>
+
+#include <krb5/krb5.h>
+#include <krb5/preauth_plugin.h>
+
+/* This is not a standardized value. It's defined here only to make it easier
+ * to change in this module. */
+#define KRB5_PADATA_CKSUM_BODY_REQ 130
+
+struct server_stats{
+ int successes, failures;
+};
+
+static int
+client_get_flags(krb5_context kcontext, krb5_preauthtype pa_type)
+{
+ return PA_REAL;
+}
+
+static krb5_error_code
+client_process(krb5_context kcontext,
+ void *client_plugin_context,
+ void *client_request_context,
+ preauth_get_client_data_proc client_get_data_proc,
+ struct _krb5_preauth_client_rock *rock,
+ krb5_kdc_req *request,
+ krb5_data *encoded_request_body,
+ krb5_data *encoded_previous_request,
+ krb5_pa_data *pa_data,
+ krb5_prompter_fct prompter,
+ void *prompter_data,
+ preauth_get_as_key_proc gak_fct,
+ void *gak_data,
+ krb5_data *salt, krb5_data *s2kparams,
+ krb5_keyblock *as_key,
+ krb5_pa_data **out_pa_data)
+{
+ krb5_pa_data *send_pa;
+ krb5_checksum checksum;
+ krb5_enctype enctype;
+ krb5_cksumtype *cksumtypes;
+ krb5_error_code status = 0;
+ krb5_int32 cksumtype, *enctypes;
+ unsigned int i, n_enctypes, cksumtype_count;
+
+ memset(&checksum, 0, sizeof(checksum));
+
+ /* Get the user's long-term key if we haven't asked for it yet. Try
+ * all of the encryption types which the server supports. */
+ if (as_key->length == 0) {
+ if ((pa_data != NULL) && (pa_data->length >= 4)) {
+#ifdef DEBUG
+ fprintf(stderr, "%d bytes of preauth data.\n", pa_data->length);
+#endif
+ n_enctypes = pa_data->length / 4;
+ enctypes = (krb5_int32*) pa_data->contents;
+ } else {
+ n_enctypes = request->nktypes;
+ }
+ for (i = 0; i < n_enctypes; i++) {
+ if ((pa_data != NULL) && (pa_data->length >= 4)) {
+ memcpy(&enctype, pa_data->contents + 4 * i, 4);
+ enctype = ntohl(enctype);
+ } else {
+ enctype = request->ktype[i];
+ }
+#ifdef DEBUG
+ fprintf(stderr, "Asking for AS key (type = %d).\n", enctype);
+#endif
+ status = (*gak_fct)(kcontext, request->client, enctype,
+ prompter, prompter_data,
+ salt, s2kparams, as_key, gak_data);
+ if (status == 0)
+ break;
+ }
+ if (status != 0)
+ return status;
+ }
+#ifdef DEBUG
+ fprintf(stderr, "Got AS key (type = %d).\n", as_key->enctype);
+#endif
+
+ /* Determine an appropriate checksum type for this key. */
+ cksumtype_count = 0;
+ cksumtypes = NULL;
+ status = krb5_c_keyed_checksum_types(kcontext, as_key->enctype,
+ &cksumtype_count, &cksumtypes);
+ if (status != 0)
+ return status;
+
+ /* Generate the checksum. */
+ for (i = 0; i < cksumtype_count; i++) {
+ status = krb5_c_make_checksum(kcontext, cksumtypes[i], as_key,
+ KRB5_KEYUSAGE_TGS_REQ_AUTH_CKSUM,
+ encoded_request_body,
+ &checksum);
+ if (status == 0) {
+#ifdef DEBUG
+ fprintf(stderr, "Made checksum (type = %d, %d bytes).\n",
+ checksum.checksum_type, encoded_request_body->length);
+#endif
+ break;
+ }
+ }
+ cksumtype = htonl(cksumtypes[i]);
+ krb5_free_cksumtypes(kcontext, cksumtypes);
+ if (status != 0) {
+ if (checksum.length > 0)
+ krb5_free_checksum_contents(kcontext, &checksum);
+ return status;
+ }
+
+ /* Allocate the preauth data structure. */
+ send_pa = malloc(sizeof(krb5_pa_data));
+ if (send_pa == NULL) {
+ krb5_free_checksum_contents(kcontext, &checksum);
+ return ENOMEM;
+ }
+ send_pa->pa_type = KRB5_PADATA_CKSUM_BODY_REQ;
+ send_pa->length = 4 + checksum.length;
+ send_pa->contents = malloc(4 + checksum.length);
+ if (send_pa->contents == NULL) {
+ krb5_free_checksum_contents(kcontext, &checksum);
+ free(send_pa);
+ return ENOMEM;
+ }
+
+ /* Store the checksum. */
+ memcpy(send_pa->contents, &cksumtype, 4);
+ memcpy(send_pa->contents + 4, checksum.contents, checksum.length);
+ *out_pa_data = send_pa;
+
+ /* Clean up. */
+ krb5_free_checksum_contents(kcontext, &checksum);
+
+ return 0;
+}
+
+/* Initialize and tear down the server-side module, and do stat tracking. */
+static krb5_error_code
+server_init(krb5_context kcontext, void **module_context)
+{
+ struct server_stats *stats;
+ stats = malloc(sizeof(struct server_stats));
+ if (stats == NULL)
+ return ENOMEM;
+ stats->successes = 0;
+ stats->failures = 0;
+ *module_context = stats;
+ return 0;
+}
+static void
+server_fini(krb5_context kcontext, void *module_context)
+{
+ struct server_stats *stats;
+ stats = module_context;
+ if (stats != NULL) {
+#ifdef DEBUG
+ fprintf(stderr, "Total: %d clients failed, %d succeeded.\n",
+ stats->failures, stats->successes);
+#endif
+ free(stats);
+ }
+}
+
+/* Obtain and return any preauthentication data (which is destined for the
+ * client) which matches type data->pa_type. */
+static krb5_error_code
+server_get_edata(krb5_context kcontext,
+ krb5_kdc_req *request,
+ struct _krb5_db_entry_new *client,
+ struct _krb5_db_entry_new *server,
+ preauth_get_entry_data_proc server_get_entry_data,
+ void *pa_module_context,
+ krb5_pa_data *data)
+{
+ krb5_data *key_data;
+ krb5_keyblock *keys, *key;
+ krb5_int32 *enctypes, enctype;
+ int i;
+
+ /* Retrieve the client's keys. */
+ key_data = NULL;
+ if ((*server_get_entry_data)(kcontext, request, client,
+ krb5plugin_preauth_keys, &key_data) != 0) {
+#ifdef DEBUG
+ fprintf(stderr, "Error retrieving client keys.\n");
+#endif
+ return KRB5KDC_ERR_PADATA_TYPE_NOSUPP;
+ }
+
+ /* Count which types of keys we've got, freeing the contents, which we
+ * don't need at this point. */
+ keys = (krb5_keyblock *) key_data->data;
+ key = NULL;
+ for (i = 0; keys[i].enctype != 0; i++)
+ krb5_free_keyblock_contents(kcontext, &keys[i]);
+
+ /* Return the list of encryption types. */
+ enctypes = malloc((unsigned)i * 4);
+ if (enctypes == NULL) {
+ krb5_free_data(kcontext, key_data);
+ return ENOMEM;
+ }
+#ifdef DEBUG
+ fprintf(stderr, "Supported enctypes = {");
+#endif
+ for (i = 0; keys[i].enctype != 0; i++) {
+#ifdef DEBUG
+ fprintf(stderr, "%s%d", (i > 0) ? ", " : "", keys[i].enctype);
+#endif
+ enctype = htonl(keys[i].enctype);
+ memcpy(&enctypes[i], &enctype, 4);
+ }
+#ifdef DEBUG
+ fprintf(stderr, "}.\n");
+#endif
+ data->pa_type = KRB5_PADATA_CKSUM_BODY_REQ;
+ data->length = (i * 4);
+ data->contents = (unsigned char *) enctypes;
+ krb5_free_data(kcontext, key_data);
+ return 0;
+}
+
+/* Verify a request from a client. */
+static krb5_error_code
+server_verify(krb5_context kcontext,
+ struct _krb5_db_entry_new *client,
+ krb5_data *req_pkt,
+ krb5_kdc_req *request,
+ krb5_enc_tkt_part *enc_tkt_reply,
+ krb5_pa_data *data,
+ preauth_get_entry_data_proc server_get_entry_data,
+ void *pa_module_context,
+ void **pa_request_context,
+ krb5_data **e_data)
+{
+ krb5_int32 cksumtype;
+ krb5_checksum checksum;
+ krb5_boolean valid;
+ krb5_data *key_data, *req_body;
+ krb5_keyblock *keys, *key;
+ size_t length;
+ int i;
+ unsigned int j, cksumtypes_count;
+ krb5_cksumtype *cksumtypes;
+ krb5_error_code status;
+ struct server_stats *stats;
+ krb5_data *test_edata;
+
+ stats = pa_module_context;
+
+ /* Verify the preauth data. Start with the checksum type. */
+ if (data->length < 4) {
+ stats->failures++;
+ return KRB5KDC_ERR_PREAUTH_FAILED;
+ }
+ memcpy(&cksumtype, data->contents, 4);
+ memset(&checksum, 0, sizeof(checksum));
+ checksum.checksum_type = ntohl(cksumtype);
+
+ /* Verify that the amount of data we have left is what we expect. */
+ if (krb5_c_checksum_length(kcontext, checksum.checksum_type,
+ &length) != 0) {
+#ifdef DEBUG
+ fprintf(stderr, "Error determining checksum size (type = %d). "
+ "Is it supported?\n", checksum.checksum_type);
+#endif
+ stats->failures++;
+ return KRB5KDC_ERR_SUMTYPE_NOSUPP;
+ }
+ if (data->length - 4 != length) {
+#ifdef DEBUG
+ fprintf(stderr, "Checksum size doesn't match client packet size.\n");
+#endif
+ stats->failures++;
+ return KRB5KDC_ERR_PREAUTH_FAILED;
+ }
+ checksum.length = length;
+
+ /* Pull up the client's keys. */
+ key_data = NULL;
+ if ((*server_get_entry_data)(kcontext, request, client,
+ krb5plugin_preauth_keys, &key_data) != 0) {
+#ifdef DEBUG
+ fprintf(stderr, "Error retrieving client keys.\n");
+#endif
+ stats->failures++;
+ return KRB5KDC_ERR_PREAUTH_FAILED;
+ }
+
+ /* Find the key which would have been used to generate the checksum. */
+ keys = (krb5_keyblock *) key_data->data;
+ key = NULL;
+ for (i = 0; keys[i].enctype != 0; i++) {
+ key = &keys[i];
+ cksumtypes_count = 0;
+ cksumtypes = NULL;
+ if (krb5_c_keyed_checksum_types(kcontext, key->enctype,
+ &cksumtypes_count, &cksumtypes) != 0)
+ continue;
+ for (j = 0; j < cksumtypes_count; j++) {
+ if (cksumtypes[j] == checksum.checksum_type)
+ break;
+ }
+ if (cksumtypes != NULL)
+ krb5_free_cksumtypes(kcontext, cksumtypes);
+ if (j < cksumtypes_count) {
+#ifdef DEBUG
+ fprintf(stderr, "Found checksum key.\n");
+#endif
+ break;
+ }
+ }
+ if ((key == NULL) || (key->enctype == 0)) {
+ for (i = 0; keys[i].enctype != 0; i++)
+ krb5_free_keyblock_contents(kcontext, &keys[i]);
+ krb5_free_data(kcontext, key_data);
+ stats->failures++;
+ return KRB5KDC_ERR_SUMTYPE_NOSUPP;
+ }
+
+ /* Save a copy of the key. */
+ if (krb5_copy_keyblock(kcontext, &keys[i], &key) != 0) {
+ for (i = 0; keys[i].enctype != 0; i++)
+ krb5_free_keyblock_contents(kcontext, &keys[i]);
+ krb5_free_data(kcontext, key_data);
+ stats->failures++;
+ return KRB5KDC_ERR_SUMTYPE_NOSUPP;
+ }
+ for (i = 0; keys[i].enctype != 0; i++)
+ krb5_free_keyblock_contents(kcontext, &keys[i]);
+ krb5_free_data(kcontext, key_data);
+
+ /* Rebuild a copy of the client's request-body. If we were serious
+ * about doing this with any chance of working interoperability, we'd
+ * extract the structure directly from the req_pkt structure. This
+ * will probably work if it's us on both ends, though. */
+ req_body = NULL;
+ if ((*server_get_entry_data)(kcontext, request, client,
+ krb5plugin_preauth_request_body,
+ &req_body) != 0) {
+ krb5_free_keyblock(kcontext, key);
+ stats->failures++;
+ return KRB5KDC_ERR_PREAUTH_FAILED;
+ }
+
+#ifdef DEBUG
+ fprintf(stderr, "AS key type %d, checksum type %d, %d bytes.\n",
+ key->enctype, checksum.checksum_type, req_body->length);
+#endif
+
+ /* Verify the checksum itself. */
+ checksum.contents = data->contents + 4;
+ valid = FALSE;
+ status = krb5_c_verify_checksum(kcontext, key,
+ KRB5_KEYUSAGE_TGS_REQ_AUTH_CKSUM,
+ req_body, &checksum, &valid);
+
+ /* Clean up. */
+ krb5_free_data(kcontext, req_body);
+ krb5_free_keyblock(kcontext, key);
+
+ /* Evaluate our results. */
+ if ((status != 0) || (!valid)) {
+#ifdef DEBUG
+ if (status != 0) {
+ fprintf(stderr, "Error in checksum verification.\n");
+ } else {
+ fprintf(stderr, "Checksum mismatch.\n");
+ }
+#endif
+ /* Return edata to exercise code that handles edata... */
+ test_edata = malloc(sizeof(*test_edata));
+ if (test_edata != NULL) {
+ test_edata->data = malloc(20);
+ if (test_edata->data == NULL) {
+ free(test_edata);
+ } else {
+ test_edata->length = 20;
+ memset(test_edata->data, 'F', 20); /* fill it with junk */
+ *e_data = test_edata;
+ }
+ }
+ stats->failures++;
+ return KRB5KDC_ERR_PREAUTH_FAILED;
+ }
+
+ /* Return edata to exercise code that handles edata... */
+ test_edata = malloc(sizeof(*test_edata));
+ if (test_edata != NULL) {
+ test_edata->data = malloc(20);
+ if (test_edata->data == NULL) {
+ free(test_edata);
+ } else {
+ test_edata->length = 20;
+ memset(test_edata->data, 'S', 20); /* fill it with junk */
+ *e_data = test_edata;
+ }
+ }
+
+ /* Note that preauthentication succeeded. */
+ enc_tkt_reply->flags |= TKT_FLG_PRE_AUTH;
+ stats->successes++;
+ return 0;
+}
+
+/* Create the response for a client. */
+static krb5_error_code
+server_return(krb5_context kcontext,
+ krb5_pa_data *padata,
+ struct _krb5_db_entry_new *client,
+ krb5_data *req_pkt,
+ krb5_kdc_req *request,
+ krb5_kdc_rep *reply,
+ struct _krb5_key_data *client_key,
+ krb5_keyblock *encrypting_key,
+ krb5_pa_data **send_pa,
+ preauth_get_entry_data_proc server_get_entry_data,
+ void *pa_module_context,
+ void **pa_request_context)
+{
+ /* We don't need to send data back on the return trip. */
+ *send_pa = NULL;
+ return 0;
+}
+
+static int
+server_get_flags(krb5_context kcontext, krb5_preauthtype pa_type)
+{
+ return PA_SUFFICIENT;
+}
+
+static krb5_preauthtype supported_client_pa_types[] = {
+ KRB5_PADATA_CKSUM_BODY_REQ, 0,
+};
+static krb5_preauthtype supported_server_pa_types[] = {
+ KRB5_PADATA_CKSUM_BODY_REQ, 0,
+};
+
+struct krb5plugin_preauth_client_ftable_v0 preauthentication_client_0_backport_1_6 = {
+ "cksum_body", /* name */
+ &supported_client_pa_types[0], /* pa_type_list */
+ NULL, /* enctype_list */
+ NULL, /* plugin init function */
+ NULL, /* plugin fini function */
+ client_get_flags, /* get flags function */
+ NULL, /* request init function */
+ NULL, /* request fini function */
+ client_process, /* process function */
+ NULL, /* try_again function */
+};
+
+struct krb5plugin_preauth_server_ftable_v0 preauthentication_server_0_backport_1_6 = {
+ "cksum_body",
+ &supported_server_pa_types[0],
+ server_init,
+ server_fini,
+ server_get_flags,
+ server_get_edata,
+ server_verify,
+ server_return,
+ NULL
+};
--- krb5/src/configure.in
+++ krb5/src/configure.in
@@ -900,7 +900,7 @@ fi
if test -n "$KRB4_LIB"; then
K5_GEN_MAKEFILE(lib/krb4)
fi
-AC_CONFIG_SUBDIRS(lib/apputils plugins/kdb/db2 appl tests)
+AC_CONFIG_SUBDIRS(lib/apputils plugins/kdb/db2 plugins/preauth/wpse plugins/preauth/cksum_body appl tests)
dnl
if false; then
AC_CHECK_HEADERS(Python.h python2.3/Python.h)
--- krb5/src/Makefile.in
+++ krb5/src/Makefile.in
@@ -3,8 +3,8 @@ datadir=@datadir@
thisconfigdir=.
myfulldir=.
mydir=.
-# Don't build sample by default: plugins/locate/python
-SUBDIRS=util include lib @krb524@ kdc kadmin slave clients \
+# Don't build sample by default: plugins/locate/python plugins/preauth/wpse plugins/preauth/cksum_body
+SUBDIRS=util include lib @krb524@ kdc kadmin slave clients \
plugins/kdb/db2 \
appl tests \
config-files gen-manpages
--- krb5/src/config-files/krb5.conf.M
+++ krb5/src/config-files/krb5.conf.M
@@ -156,6 +156,12 @@ libraries, use a value of 3 to use the C
instead. This field is ignored when its value is incompatible with
the session key type.
+.IP preferred_preauth_types
+This allows you to set the preferred preauthentication types which the
+client will attempt before others which may be advertised by a KDC. The
+default value for this setting is "17, 16, 15, 14", which forces libkrb5
+to attempt to use PKINIT if it is supported.
+
.IP ccache_type
User this parameter on systems which are DCE clients, to specify the
type of cache to be created by kinit, or when forwarded tickets are
@@ -169,7 +175,7 @@ Specifies the location of the Kerberos V
"/etc/srvtab".
.IP krb4_config
-Specifies the location of hte Kerberos V4 configuration file. Default
+Specifies the location of the Kerberos V4 configuration file. Default
is "/etc/krb.conf".
.IP krb4_realms
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