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|
/*
* 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: cksum_body_main.c,v 1.4 2007/01/02 22:33:50 kwc Exp $"
#include "autoconf.h"
#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;
};
typedef struct _test_svr_req_ctx {
int value1;
int value2;
} test_svr_req_ctx;
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,
krb5_get_init_creds_opt *opt,
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;
int num_gic_info = 0;
krb5_gic_opt_pa_data *gic_info;
status = krb5_get_init_creds_opt_get_pa(kcontext, opt,
&num_gic_info, &gic_info);
if (status && status != ENOENT) {
#ifdef DEBUG
fprintf(stderr, "Error from krb5_get_init_creds_opt_get_pa: %s\n",
error_message(status));
#endif
return status;
}
#ifdef DEBUG
fprintf(stderr, "(cksum_body) Got the following gic options:\n");
#endif
for (i = 0; i < num_gic_info; i++) {
#ifdef DEBUG
fprintf(stderr, " '%s' = '%s'\n", gic_info[i].attr, gic_info[i].value);
#endif
}
krb5_get_init_creds_opt_free_pa(kcontext, num_gic_info, gic_info);
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(2 * sizeof(krb5_pa_data *));
if (send_pa == NULL) {
krb5_free_checksum_contents(kcontext, &checksum);
return ENOMEM;
}
send_pa[1] = NULL; /* Terminate list */
send_pa[0] = malloc(sizeof(krb5_pa_data));
if (send_pa[0] == NULL) {
krb5_free_checksum_contents(kcontext, &checksum);
free(send_pa);
return ENOMEM;
}
send_pa[0]->pa_type = KRB5_PADATA_CKSUM_BODY_REQ;
send_pa[0]->length = 4 + checksum.length;
send_pa[0]->contents = malloc(4 + checksum.length);
if (send_pa[0]->contents == NULL) {
krb5_free_checksum_contents(kcontext, &checksum);
free(send_pa[0]);
free(send_pa);
return ENOMEM;
}
/* Store the checksum. */
memcpy(send_pa[0]->contents, &cksumtype, 4);
memcpy(send_pa[0]->contents + 4, checksum.contents, checksum.length);
*out_pa_data = send_pa;
/* Clean up. */
krb5_free_checksum_contents(kcontext, &checksum);
return 0;
}
static krb5_error_code
client_gic_opt(krb5_context kcontext,
void *plugin_context,
krb5_get_init_creds_opt *opt,
const char *attr,
const char *value)
{
#ifdef DEBUG
fprintf(stderr, "(cksum_body) client_gic_opt: received '%s' = '%s'\n",
attr, value);
#endif
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, const char **realmnames)
{
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_authdata ***authz_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;
test_svr_req_ctx *svr_req_ctx;
krb5_authdata **my_authz_data = NULL;
stats = pa_module_context;
#ifdef DEBUG
fprintf(stderr, "cksum_body: server_verify\n");
#endif
/* 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 some junk authorization data just to exercise the
* code path handling the returned authorization data.
*
* NOTE that this is NOT VALID authorization data!
*/
#ifdef DEBUG
fprintf(stderr, "cksum_body: doing authorization data!\n");
#endif
#if 1 /* USE_5000_AD */
#define AD_ALLOC_SIZE 5000
/* ad_header consists of a sequence tag (0x30) and length (0x82 0x1384)
* followed by octet string tag (0x04) and length (0x82 0x1380) */
krb5_octet ad_header[] = {0x30, 0x82, 0x13, 0x84, 0x04, 0x82, 0x13, 0x80};
#else
#define AD_ALLOC_SIZE 100
/* ad_header consists of a sequence tag (0x30) and length (0x62)
* followed by octet string tag (0x04) and length (0x60) */
krb5_octet ad_header[] = {0x30, 0x62, 0x04, 0x60};
#endif
my_authz_data = malloc(2 * sizeof(*my_authz_data));
if (my_authz_data != NULL) {
my_authz_data[1] = NULL;
my_authz_data[0] = malloc(sizeof(krb5_authdata));
if (my_authz_data[0] == NULL) {
free(my_authz_data);
return ENOMEM;
}
my_authz_data[0]->contents = malloc(AD_ALLOC_SIZE);
if (my_authz_data[0]->contents == NULL) {
free(my_authz_data[0]);
free(my_authz_data);
return ENOMEM;
}
memset(my_authz_data[0]->contents, '\0', AD_ALLOC_SIZE);
my_authz_data[0]->magic = KV5M_AUTHDATA;
my_authz_data[0]->ad_type = 1;
my_authz_data[0]->length = AD_ALLOC_SIZE;
memcpy(my_authz_data[0]->contents, ad_header, sizeof(ad_header));
sprintf(my_authz_data[0]->contents + sizeof(ad_header),
"cksum authorization data: %d bytes worth!\n", AD_ALLOC_SIZE);
*authz_data = my_authz_data;
#ifdef DEBUG
fprintf(stderr, "Returning %d bytes of authorization data\n",
AD_ALLOC_SIZE);
#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, 'S', 20); /* fill it with junk */
*e_data = test_edata;
}
}
/* Return a request context to exercise code that handles it */
svr_req_ctx = malloc(sizeof(*svr_req_ctx));
if (svr_req_ctx != NULL) {
svr_req_ctx->value1 = 111111;
svr_req_ctx->value2 = 222222;
#ifdef DEBUG
fprintf(stderr, "server_verify: returning context at %p\n",
svr_req_ctx);
#endif
}
*pa_request_context = svr_req_ctx;
/* 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;
}
/* Test server request context freeing */
static krb5_error_code
server_free_reqctx(krb5_context kcontext,
void *pa_module_context,
void **pa_request_context)
{
test_svr_req_ctx *svr_req_ctx;
#ifdef DEBUG
fprintf(stderr, "server_free_reqctx: entered!\n");
#endif
if (pa_request_context == NULL)
return 0;
svr_req_ctx = *pa_request_context;
if (svr_req_ctx == NULL)
return 0;
if (svr_req_ctx->value1 != 111111 || svr_req_ctx->value2 != 222222) {
fprintf(stderr, "server_free_reqctx: got invalid req context "
"at %p with values %d and %d\n",
svr_req_ctx, svr_req_ctx->value1, svr_req_ctx->value2);
return EINVAL;
}
#ifdef DEBUG
fprintf(stderr, "server_free_reqctx: freeing context at %p\n", svr_req_ctx);
#endif
free(svr_req_ctx);
*pa_request_context = 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_v1 preauthentication_client_1 = {
"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 */
client_gic_opt /* get init creds opt function */
};
struct krb5plugin_preauth_server_ftable_v1 preauthentication_server_1 = {
"cksum_body",
&supported_server_pa_types[0],
server_init,
server_fini,
server_get_flags,
server_get_edata,
server_verify,
server_return,
server_free_reqctx
};
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