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Diffstat (limited to 'third_party/heimdal/lib/gssapi/krb5/get_mic.c')
-rw-r--r--third_party/heimdal/lib/gssapi/krb5/get_mic.c330
1 files changed, 330 insertions, 0 deletions
diff --git a/third_party/heimdal/lib/gssapi/krb5/get_mic.c b/third_party/heimdal/lib/gssapi/krb5/get_mic.c
new file mode 100644
index 0000000..d9cf9d7
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+++ b/third_party/heimdal/lib/gssapi/krb5/get_mic.c
@@ -0,0 +1,330 @@
+/*
+ * 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 "gsskrb5_locl.h"
+
+#ifdef HEIM_WEAK_CRYPTO
+
+static OM_uint32
+mic_des
+ (OM_uint32 * minor_status,
+ const gsskrb5_ctx ctx,
+ krb5_context context,
+ gss_qop_t qop_req,
+ const gss_buffer_t message_buffer,
+ gss_buffer_t message_token,
+ krb5_keyblock *key
+ )
+{
+ u_char *p;
+ EVP_MD_CTX *md5;
+ u_char hash[16];
+ DES_key_schedule schedule;
+ EVP_CIPHER_CTX des_ctx;
+ DES_cblock deskey;
+ DES_cblock zero;
+ int32_t seq_number;
+ size_t len, total_len;
+
+ _gsskrb5_encap_length (22, &len, &total_len, GSS_KRB5_MECHANISM);
+
+ message_token->length = total_len;
+ message_token->value = malloc (total_len);
+ if (message_token->value == NULL) {
+ message_token->length = 0;
+ *minor_status = ENOMEM;
+ return GSS_S_FAILURE;
+ }
+
+ p = _gsskrb5_make_header(message_token->value,
+ len,
+ "\x01\x01", /* TOK_ID */
+ GSS_KRB5_MECHANISM);
+
+ memcpy (p, "\x00\x00", 2); /* SGN_ALG = DES MAC MD5 */
+ p += 2;
+
+ memcpy (p, "\xff\xff\xff\xff", 4); /* Filler */
+ p += 4;
+
+ /* Fill in later (SND-SEQ) */
+ memset (p, 0, 16);
+ p += 16;
+
+ /* checksum */
+ md5 = EVP_MD_CTX_create();
+ EVP_DigestInit_ex(md5, EVP_md5(), NULL);
+ EVP_DigestUpdate(md5, p - 24, 8);
+ EVP_DigestUpdate(md5, message_buffer->value, message_buffer->length);
+ EVP_DigestFinal_ex(md5, hash, NULL);
+ EVP_MD_CTX_destroy(md5);
+
+ memset (&zero, 0, sizeof(zero));
+ memcpy (&deskey, key->keyvalue.data, sizeof(deskey));
+ DES_set_key_unchecked (&deskey, &schedule);
+ DES_cbc_cksum ((void *)hash, (void *)hash, sizeof(hash),
+ &schedule, &zero);
+ memcpy (p - 8, hash, 8); /* SGN_CKSUM */
+
+ HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex);
+ /* sequence number */
+ krb5_auth_con_getlocalseqnumber (context,
+ ctx->auth_context,
+ &seq_number);
+
+ p -= 16; /* SND_SEQ */
+ p[0] = (seq_number >> 0) & 0xFF;
+ p[1] = (seq_number >> 8) & 0xFF;
+ p[2] = (seq_number >> 16) & 0xFF;
+ p[3] = (seq_number >> 24) & 0xFF;
+ memset (p + 4,
+ (ctx->more_flags & LOCAL) ? 0 : 0xFF,
+ 4);
+
+ EVP_CIPHER_CTX_init(&des_ctx);
+ EVP_CipherInit_ex(&des_ctx, EVP_des_cbc(), NULL, key->keyvalue.data, p + 8, 1);
+ EVP_Cipher(&des_ctx, p, p, 8);
+ EVP_CIPHER_CTX_cleanup(&des_ctx);
+
+ krb5_auth_con_setlocalseqnumber (context,
+ ctx->auth_context,
+ ++seq_number);
+ HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
+
+ memset_s(deskey, sizeof(deskey), 0, sizeof(deskey));
+ memset_s(&schedule, sizeof(schedule), 0, sizeof(schedule));
+
+ *minor_status = 0;
+ return GSS_S_COMPLETE;
+}
+#endif
+
+static OM_uint32
+mic_des3
+ (OM_uint32 * minor_status,
+ const gsskrb5_ctx ctx,
+ krb5_context context,
+ gss_qop_t qop_req,
+ const gss_buffer_t message_buffer,
+ gss_buffer_t message_token,
+ krb5_keyblock *key
+ )
+{
+ u_char *p;
+ Checksum cksum;
+ u_char seq[8];
+
+ int32_t seq_number;
+ size_t len, total_len;
+
+ krb5_crypto crypto;
+ krb5_error_code kret;
+ krb5_data encdata;
+ char *tmp;
+ char ivec[8];
+
+ _gsskrb5_encap_length (36, &len, &total_len, GSS_KRB5_MECHANISM);
+
+ message_token->length = total_len;
+ message_token->value = malloc (total_len);
+ if (message_token->value == NULL) {
+ message_token->length = 0;
+ *minor_status = ENOMEM;
+ return GSS_S_FAILURE;
+ }
+
+ p = _gsskrb5_make_header(message_token->value,
+ len,
+ "\x01\x01", /* TOK-ID */
+ GSS_KRB5_MECHANISM);
+
+ memcpy (p, "\x04\x00", 2); /* SGN_ALG = HMAC SHA1 DES3-KD */
+ p += 2;
+
+ memcpy (p, "\xff\xff\xff\xff", 4); /* filler */
+ p += 4;
+
+ /* this should be done in parts */
+
+ tmp = malloc (message_buffer->length + 8);
+ if (tmp == NULL) {
+ free (message_token->value);
+ message_token->value = NULL;
+ message_token->length = 0;
+ *minor_status = ENOMEM;
+ return GSS_S_FAILURE;
+ }
+ memcpy (tmp, p - 8, 8);
+ memcpy (tmp + 8, message_buffer->value, message_buffer->length);
+
+ kret = krb5_crypto_init(context, key, 0, &crypto);
+ if (kret) {
+ free (message_token->value);
+ message_token->value = NULL;
+ message_token->length = 0;
+ free (tmp);
+ *minor_status = kret;
+ return GSS_S_FAILURE;
+ }
+
+ kret = krb5_create_checksum (context,
+ crypto,
+ KRB5_KU_USAGE_SIGN,
+ 0,
+ tmp,
+ message_buffer->length + 8,
+ &cksum);
+ free (tmp);
+ krb5_crypto_destroy (context, crypto);
+ if (kret) {
+ free (message_token->value);
+ message_token->value = NULL;
+ message_token->length = 0;
+ *minor_status = kret;
+ return GSS_S_FAILURE;
+ }
+
+ memcpy (p + 8, cksum.checksum.data, cksum.checksum.length);
+
+ HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex);
+ /* sequence number */
+ krb5_auth_con_getlocalseqnumber (context,
+ ctx->auth_context,
+ &seq_number);
+
+ seq[0] = (seq_number >> 0) & 0xFF;
+ seq[1] = (seq_number >> 8) & 0xFF;
+ seq[2] = (seq_number >> 16) & 0xFF;
+ seq[3] = (seq_number >> 24) & 0xFF;
+ memset (seq + 4,
+ (ctx->more_flags & LOCAL) ? 0 : 0xFF,
+ 4);
+
+ kret = krb5_crypto_init(context, key,
+ ETYPE_DES3_CBC_NONE, &crypto);
+ if (kret) {
+ free (message_token->value);
+ message_token->value = NULL;
+ message_token->length = 0;
+ *minor_status = kret;
+ return GSS_S_FAILURE;
+ }
+
+ if (ctx->more_flags & COMPAT_OLD_DES3)
+ memset(ivec, 0, 8);
+ else
+ memcpy(ivec, p + 8, 8);
+
+ kret = krb5_encrypt_ivec (context,
+ crypto,
+ KRB5_KU_USAGE_SEQ,
+ seq, 8, &encdata, ivec);
+ krb5_crypto_destroy (context, crypto);
+ if (kret) {
+ free (message_token->value);
+ message_token->value = NULL;
+ message_token->length = 0;
+ *minor_status = kret;
+ return GSS_S_FAILURE;
+ }
+
+ assert (encdata.length == 8);
+
+ memcpy (p, encdata.data, encdata.length);
+ krb5_data_free (&encdata);
+
+ krb5_auth_con_setlocalseqnumber (context,
+ ctx->auth_context,
+ ++seq_number);
+ HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
+
+ free_Checksum (&cksum);
+ *minor_status = 0;
+ return GSS_S_COMPLETE;
+}
+
+OM_uint32 GSSAPI_CALLCONV _gsskrb5_get_mic
+ (OM_uint32 * minor_status,
+ gss_const_ctx_id_t context_handle,
+ gss_qop_t qop_req,
+ const gss_buffer_t message_buffer,
+ gss_buffer_t message_token
+ )
+{
+ krb5_context context;
+ const gsskrb5_ctx ctx = (const gsskrb5_ctx) context_handle;
+ krb5_keyblock *key;
+ OM_uint32 ret;
+
+ GSSAPI_KRB5_INIT (&context);
+
+ if (ctx->more_flags & IS_CFX)
+ return _gssapi_mic_cfx (minor_status, ctx, context, qop_req,
+ message_buffer, message_token);
+
+ HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex);
+ ret = _gsskrb5i_get_token_key(ctx, context, &key);
+ HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
+ if (ret) {
+ *minor_status = ret;
+ return GSS_S_FAILURE;
+ }
+
+ switch (key->keytype) {
+ case KRB5_ENCTYPE_DES_CBC_CRC :
+ case KRB5_ENCTYPE_DES_CBC_MD4 :
+ case KRB5_ENCTYPE_DES_CBC_MD5 :
+#ifdef HEIM_WEAK_CRYPTO
+ ret = mic_des (minor_status, ctx, context, qop_req,
+ message_buffer, message_token, key);
+#else
+ ret = GSS_S_FAILURE;
+#endif
+ break;
+ case KRB5_ENCTYPE_DES3_CBC_MD5 :
+ case KRB5_ENCTYPE_DES3_CBC_SHA1 :
+ ret = mic_des3 (minor_status, ctx, context, qop_req,
+ message_buffer, message_token, key);
+ break;
+ case KRB5_ENCTYPE_ARCFOUR_HMAC_MD5:
+ case KRB5_ENCTYPE_ARCFOUR_HMAC_MD5_56:
+ ret = _gssapi_get_mic_arcfour (minor_status, ctx, context, qop_req,
+ message_buffer, message_token, key);
+ break;
+ default :
+ abort();
+ break;
+ }
+ krb5_free_keyblock (context, key);
+ return ret;
+}
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