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-rw-r--r--lib/gssapi/krb5/verify_mic.c344
1 files changed, 344 insertions, 0 deletions
diff --git a/lib/gssapi/krb5/verify_mic.c b/lib/gssapi/krb5/verify_mic.c
new file mode 100644
index 000000000000..52381afcc28a
--- /dev/null
+++ b/lib/gssapi/krb5/verify_mic.c
@@ -0,0 +1,344 @@
+/*
+ * Copyright (c) 1997 - 2003 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden).
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the Institute nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include "krb5/gsskrb5_locl.h"
+
+RCSID("$Id: verify_mic.c 19031 2006-11-13 18:02:57Z lha $");
+
+static OM_uint32
+verify_mic_des
+ (OM_uint32 * minor_status,
+ const gsskrb5_ctx context_handle,
+ krb5_context context,
+ const gss_buffer_t message_buffer,
+ const gss_buffer_t token_buffer,
+ gss_qop_t * qop_state,
+ krb5_keyblock *key,
+ char *type
+ )
+{
+ u_char *p;
+ MD5_CTX md5;
+ u_char hash[16], *seq;
+ DES_key_schedule schedule;
+ DES_cblock zero;
+ DES_cblock deskey;
+ uint32_t seq_number;
+ OM_uint32 ret;
+ int cmp;
+
+ p = token_buffer->value;
+ ret = _gsskrb5_verify_header (&p,
+ token_buffer->length,
+ type,
+ GSS_KRB5_MECHANISM);
+ if (ret)
+ return ret;
+
+ if (memcmp(p, "\x00\x00", 2) != 0)
+ return GSS_S_BAD_SIG;
+ p += 2;
+ if (memcmp (p, "\xff\xff\xff\xff", 4) != 0)
+ return GSS_S_BAD_MIC;
+ p += 4;
+ p += 16;
+
+ /* verify checksum */
+ MD5_Init (&md5);
+ MD5_Update (&md5, p - 24, 8);
+ MD5_Update (&md5, message_buffer->value,
+ message_buffer->length);
+ MD5_Final (hash, &md5);
+
+ memset (&zero, 0, sizeof(zero));
+ memcpy (&deskey, key->keyvalue.data, sizeof(deskey));
+
+ DES_set_key (&deskey, &schedule);
+ DES_cbc_cksum ((void *)hash, (void *)hash, sizeof(hash),
+ &schedule, &zero);
+ if (memcmp (p - 8, hash, 8) != 0) {
+ memset (deskey, 0, sizeof(deskey));
+ memset (&schedule, 0, sizeof(schedule));
+ return GSS_S_BAD_MIC;
+ }
+
+ /* verify sequence number */
+
+ HEIMDAL_MUTEX_lock(&context_handle->ctx_id_mutex);
+
+ p -= 16;
+ DES_set_key (&deskey, &schedule);
+ DES_cbc_encrypt ((void *)p, (void *)p, 8,
+ &schedule, (DES_cblock *)hash, DES_DECRYPT);
+
+ memset (deskey, 0, sizeof(deskey));
+ memset (&schedule, 0, sizeof(schedule));
+
+ seq = p;
+ _gsskrb5_decode_om_uint32(seq, &seq_number);
+
+ if (context_handle->more_flags & LOCAL)
+ cmp = memcmp(&seq[4], "\xff\xff\xff\xff", 4);
+ else
+ cmp = memcmp(&seq[4], "\x00\x00\x00\x00", 4);
+
+ if (cmp != 0) {
+ HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
+ return GSS_S_BAD_MIC;
+ }
+
+ ret = _gssapi_msg_order_check(context_handle->order, seq_number);
+ if (ret) {
+ HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
+ return ret;
+ }
+
+ HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
+
+ return GSS_S_COMPLETE;
+}
+
+static OM_uint32
+verify_mic_des3
+ (OM_uint32 * minor_status,
+ const gsskrb5_ctx context_handle,
+ krb5_context context,
+ const gss_buffer_t message_buffer,
+ const gss_buffer_t token_buffer,
+ gss_qop_t * qop_state,
+ krb5_keyblock *key,
+ char *type
+ )
+{
+ u_char *p;
+ u_char *seq;
+ uint32_t seq_number;
+ OM_uint32 ret;
+ krb5_crypto crypto;
+ krb5_data seq_data;
+ int cmp, docompat;
+ Checksum csum;
+ char *tmp;
+ char ivec[8];
+
+ p = token_buffer->value;
+ ret = _gsskrb5_verify_header (&p,
+ token_buffer->length,
+ type,
+ GSS_KRB5_MECHANISM);
+ if (ret)
+ return ret;
+
+ if (memcmp(p, "\x04\x00", 2) != 0) /* SGN_ALG = HMAC SHA1 DES3-KD */
+ return GSS_S_BAD_SIG;
+ p += 2;
+ if (memcmp (p, "\xff\xff\xff\xff", 4) != 0)
+ return GSS_S_BAD_MIC;
+ p += 4;
+
+ ret = krb5_crypto_init(context, key,
+ ETYPE_DES3_CBC_NONE, &crypto);
+ if (ret){
+ *minor_status = ret;
+ return GSS_S_FAILURE;
+ }
+
+ /* verify sequence number */
+ docompat = 0;
+retry:
+ if (docompat)
+ memset(ivec, 0, 8);
+ else
+ memcpy(ivec, p + 8, 8);
+
+ ret = krb5_decrypt_ivec (context,
+ crypto,
+ KRB5_KU_USAGE_SEQ,
+ p, 8, &seq_data, ivec);
+ if (ret) {
+ if (docompat++) {
+ krb5_crypto_destroy (context, crypto);
+ *minor_status = ret;
+ return GSS_S_FAILURE;
+ } else
+ goto retry;
+ }
+
+ if (seq_data.length != 8) {
+ krb5_data_free (&seq_data);
+ if (docompat++) {
+ krb5_crypto_destroy (context, crypto);
+ return GSS_S_BAD_MIC;
+ } else
+ goto retry;
+ }
+
+ HEIMDAL_MUTEX_lock(&context_handle->ctx_id_mutex);
+
+ seq = seq_data.data;
+ _gsskrb5_decode_om_uint32(seq, &seq_number);
+
+ if (context_handle->more_flags & LOCAL)
+ cmp = memcmp(&seq[4], "\xff\xff\xff\xff", 4);
+ else
+ cmp = memcmp(&seq[4], "\x00\x00\x00\x00", 4);
+
+ krb5_data_free (&seq_data);
+ if (cmp != 0) {
+ krb5_crypto_destroy (context, crypto);
+ *minor_status = 0;
+ HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
+ return GSS_S_BAD_MIC;
+ }
+
+ ret = _gssapi_msg_order_check(context_handle->order, seq_number);
+ if (ret) {
+ krb5_crypto_destroy (context, crypto);
+ *minor_status = 0;
+ HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
+ return ret;
+ }
+
+ /* verify checksum */
+
+ tmp = malloc (message_buffer->length + 8);
+ if (tmp == NULL) {
+ krb5_crypto_destroy (context, crypto);
+ HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
+ *minor_status = ENOMEM;
+ return GSS_S_FAILURE;
+ }
+
+ memcpy (tmp, p - 8, 8);
+ memcpy (tmp + 8, message_buffer->value, message_buffer->length);
+
+ csum.cksumtype = CKSUMTYPE_HMAC_SHA1_DES3;
+ csum.checksum.length = 20;
+ csum.checksum.data = p + 8;
+
+ ret = krb5_verify_checksum (context, crypto,
+ KRB5_KU_USAGE_SIGN,
+ tmp, message_buffer->length + 8,
+ &csum);
+ free (tmp);
+ if (ret) {
+ krb5_crypto_destroy (context, crypto);
+ *minor_status = ret;
+ HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
+ return GSS_S_BAD_MIC;
+ }
+ HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
+
+ krb5_crypto_destroy (context, crypto);
+ return GSS_S_COMPLETE;
+}
+
+OM_uint32
+_gsskrb5_verify_mic_internal
+ (OM_uint32 * minor_status,
+ const gsskrb5_ctx context_handle,
+ krb5_context context,
+ const gss_buffer_t message_buffer,
+ const gss_buffer_t token_buffer,
+ gss_qop_t * qop_state,
+ char * type
+ )
+{
+ krb5_keyblock *key;
+ OM_uint32 ret;
+ krb5_keytype keytype;
+
+ HEIMDAL_MUTEX_lock(&context_handle->ctx_id_mutex);
+ ret = _gsskrb5i_get_token_key(context_handle, context, &key);
+ HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
+ if (ret) {
+ *minor_status = ret;
+ return GSS_S_FAILURE;
+ }
+ *minor_status = 0;
+ krb5_enctype_to_keytype (context, key->keytype, &keytype);
+ switch (keytype) {
+ case KEYTYPE_DES :
+ ret = verify_mic_des (minor_status, context_handle, context,
+ message_buffer, token_buffer, qop_state, key,
+ type);
+ break;
+ case KEYTYPE_DES3 :
+ ret = verify_mic_des3 (minor_status, context_handle, context,
+ message_buffer, token_buffer, qop_state, key,
+ type);
+ break;
+ case KEYTYPE_ARCFOUR :
+ case KEYTYPE_ARCFOUR_56 :
+ ret = _gssapi_verify_mic_arcfour (minor_status, context_handle,
+ context,
+ message_buffer, token_buffer,
+ qop_state, key, type);
+ break;
+ default :
+ ret = _gssapi_verify_mic_cfx (minor_status, context_handle,
+ context,
+ message_buffer, token_buffer, qop_state,
+ key);
+ break;
+ }
+ krb5_free_keyblock (context, key);
+
+ return ret;
+}
+
+OM_uint32
+_gsskrb5_verify_mic
+ (OM_uint32 * minor_status,
+ const gss_ctx_id_t context_handle,
+ const gss_buffer_t message_buffer,
+ const gss_buffer_t token_buffer,
+ gss_qop_t * qop_state
+ )
+{
+ krb5_context context;
+ OM_uint32 ret;
+
+ GSSAPI_KRB5_INIT (&context);
+
+ if (qop_state != NULL)
+ *qop_state = GSS_C_QOP_DEFAULT;
+
+ ret = _gsskrb5_verify_mic_internal(minor_status,
+ (gsskrb5_ctx)context_handle,
+ context,
+ message_buffer, token_buffer,
+ qop_state, "\x01\x01");
+
+ return ret;
+}
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