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-rw-r--r--third_party/heimdal/lib/gssapi/krb5/wrap.c592
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diff --git a/third_party/heimdal/lib/gssapi/krb5/wrap.c b/third_party/heimdal/lib/gssapi/krb5/wrap.c
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+/*
+ * 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"
+
+/*
+ * Return initiator subkey, or if that doesn't exists, the subkey.
+ */
+
+krb5_error_code
+_gsskrb5i_get_initiator_subkey(const gsskrb5_ctx ctx,
+ krb5_context context,
+ krb5_keyblock **key)
+{
+ krb5_error_code ret;
+ *key = NULL;
+
+ if (ctx->more_flags & LOCAL) {
+ ret = krb5_auth_con_getlocalsubkey(context,
+ ctx->auth_context,
+ key);
+ } else {
+ ret = krb5_auth_con_getremotesubkey(context,
+ ctx->auth_context,
+ key);
+ }
+ if (ret == 0 && *key == NULL)
+ ret = krb5_auth_con_getkey(context,
+ ctx->auth_context,
+ key);
+ if (ret == 0 && *key == NULL) {
+ krb5_set_error_message(context, 0, "No initiator subkey available");
+ return GSS_KRB5_S_KG_NO_SUBKEY;
+ }
+ return ret;
+}
+
+krb5_error_code
+_gsskrb5i_get_acceptor_subkey(const gsskrb5_ctx ctx,
+ krb5_context context,
+ krb5_keyblock **key)
+{
+ krb5_error_code ret;
+ *key = NULL;
+
+ if (ctx->more_flags & LOCAL) {
+ ret = krb5_auth_con_getremotesubkey(context,
+ ctx->auth_context,
+ key);
+ } else {
+ ret = krb5_auth_con_getlocalsubkey(context,
+ ctx->auth_context,
+ key);
+ }
+ if (ret == 0 && *key == NULL) {
+ krb5_set_error_message(context, 0, "No acceptor subkey available");
+ return GSS_KRB5_S_KG_NO_SUBKEY;
+ }
+ return ret;
+}
+
+OM_uint32
+_gsskrb5i_get_token_key(const gsskrb5_ctx ctx,
+ krb5_context context,
+ krb5_keyblock **key)
+{
+ _gsskrb5i_get_acceptor_subkey(ctx, context, key);
+ if(*key == NULL) {
+ /*
+ * Only use the initiator subkey or ticket session key if an
+ * acceptor subkey was not required.
+ */
+ if ((ctx->more_flags & ACCEPTOR_SUBKEY) == 0)
+ _gsskrb5i_get_initiator_subkey(ctx, context, key);
+ }
+ if (*key == NULL) {
+ krb5_set_error_message(context, 0, "No token key available");
+ return GSS_KRB5_S_KG_NO_SUBKEY;
+ }
+ return 0;
+}
+
+static OM_uint32
+sub_wrap_size (
+ OM_uint32 req_output_size,
+ OM_uint32 * max_input_size,
+ int blocksize,
+ int extrasize
+ )
+{
+ size_t len, total_len;
+
+ len = 8 + req_output_size + blocksize + extrasize;
+
+ _gsskrb5_encap_length(len, &len, &total_len, GSS_KRB5_MECHANISM);
+
+ total_len -= req_output_size; /* token length */
+ if (total_len < req_output_size) {
+ *max_input_size = (req_output_size - total_len);
+ (*max_input_size) &= (~(OM_uint32)(blocksize - 1));
+ } else {
+ *max_input_size = 0;
+ }
+ return GSS_S_COMPLETE;
+}
+
+OM_uint32 GSSAPI_CALLCONV
+_gsskrb5_wrap_size_limit (
+ OM_uint32 * minor_status,
+ gss_const_ctx_id_t context_handle,
+ int conf_req_flag,
+ gss_qop_t qop_req,
+ OM_uint32 req_output_size,
+ OM_uint32 * max_input_size
+ )
+{
+ krb5_context context;
+ krb5_keyblock *key;
+ OM_uint32 ret;
+ const gsskrb5_ctx ctx = (const gsskrb5_ctx) context_handle;
+
+ GSSAPI_KRB5_INIT (&context);
+
+ if (ctx->more_flags & IS_CFX)
+ return _gssapi_wrap_size_cfx(minor_status, ctx, context,
+ conf_req_flag, qop_req,
+ req_output_size, max_input_size);
+
+ 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 = sub_wrap_size(req_output_size, max_input_size, 8, 22);
+#else
+ ret = GSS_S_FAILURE;
+#endif
+ break;
+ case KRB5_ENCTYPE_ARCFOUR_HMAC_MD5:
+ case KRB5_ENCTYPE_ARCFOUR_HMAC_MD5_56:
+ ret = _gssapi_wrap_size_arcfour(minor_status, ctx, context,
+ conf_req_flag, qop_req,
+ req_output_size, max_input_size, key);
+ break;
+ case KRB5_ENCTYPE_DES3_CBC_MD5 :
+ case KRB5_ENCTYPE_DES3_CBC_SHA1 :
+ ret = sub_wrap_size(req_output_size, max_input_size, 8, 34);
+ break;
+ default :
+ abort();
+ break;
+ }
+ krb5_free_keyblock (context, key);
+ *minor_status = 0;
+ return ret;
+}
+
+#ifdef HEIM_WEAK_CRYPTO
+
+static OM_uint32
+wrap_des
+ (OM_uint32 * minor_status,
+ const gsskrb5_ctx ctx,
+ krb5_context context,
+ int conf_req_flag,
+ gss_qop_t qop_req,
+ const gss_buffer_t input_message_buffer,
+ int * conf_state,
+ gss_buffer_t output_message_buffer,
+ 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;
+ size_t i;
+ int32_t seq_number;
+ size_t len, total_len, padlength, datalen;
+
+ if (IS_DCE_STYLE(ctx)) {
+ padlength = 0;
+ datalen = input_message_buffer->length;
+ len = 22 + 8;
+ _gsskrb5_encap_length (len, &len, &total_len, GSS_KRB5_MECHANISM);
+ total_len += datalen;
+ datalen += 8;
+ } else {
+ padlength = 8 - (input_message_buffer->length % 8);
+ datalen = input_message_buffer->length + padlength + 8;
+ len = datalen + 22;
+ _gsskrb5_encap_length (len, &len, &total_len, GSS_KRB5_MECHANISM);
+ }
+
+ output_message_buffer->length = total_len;
+ output_message_buffer->value = malloc (total_len);
+ if (output_message_buffer->value == NULL) {
+ output_message_buffer->length = 0;
+ *minor_status = ENOMEM;
+ return GSS_S_FAILURE;
+ }
+
+ p = _gsskrb5_make_header(output_message_buffer->value,
+ len,
+ "\x02\x01", /* TOK_ID */
+ GSS_KRB5_MECHANISM);
+
+ /* SGN_ALG */
+ memcpy (p, "\x00\x00", 2);
+ p += 2;
+ /* SEAL_ALG */
+ if(conf_req_flag)
+ memcpy (p, "\x00\x00", 2);
+ else
+ memcpy (p, "\xff\xff", 2);
+ p += 2;
+ /* Filler */
+ memcpy (p, "\xff\xff", 2);
+ p += 2;
+
+ /* fill in later */
+ memset (p, 0, 16);
+ p += 16;
+
+ /* confounder + data + pad */
+ krb5_generate_random_block(p, 8);
+ memcpy (p + 8, input_message_buffer->value,
+ input_message_buffer->length);
+ memset (p + 8 + input_message_buffer->length, padlength, padlength);
+
+ /* checksum */
+ md5 = EVP_MD_CTX_create();
+ EVP_DigestInit_ex(md5, EVP_md5(), NULL);
+ EVP_DigestUpdate(md5, p - 24, 8);
+ EVP_DigestUpdate(md5, p, datalen);
+ 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);
+
+ /* sequence number */
+ HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex);
+ krb5_auth_con_getlocalseqnumber (context,
+ ctx->auth_context,
+ &seq_number);
+
+ p -= 16;
+ 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);
+
+ /* encrypt the data */
+ p += 16;
+
+ if(conf_req_flag) {
+ memcpy (&deskey, key->keyvalue.data, sizeof(deskey));
+
+ for (i = 0; i < sizeof(deskey); ++i)
+ deskey[i] ^= 0xf0;
+
+ EVP_CIPHER_CTX_init(&des_ctx);
+ EVP_CipherInit_ex(&des_ctx, EVP_des_cbc(), NULL, deskey, zero, 1);
+ EVP_Cipher(&des_ctx, p, p, datalen);
+ EVP_CIPHER_CTX_cleanup(&des_ctx);
+ }
+ memset (deskey, 0, sizeof(deskey));
+ memset (&schedule, 0, sizeof(schedule));
+
+ if(conf_state != NULL)
+ *conf_state = conf_req_flag;
+ *minor_status = 0;
+ return GSS_S_COMPLETE;
+}
+
+#endif
+
+static OM_uint32
+wrap_des3
+ (OM_uint32 * minor_status,
+ const gsskrb5_ctx ctx,
+ krb5_context context,
+ int conf_req_flag,
+ gss_qop_t qop_req,
+ const gss_buffer_t input_message_buffer,
+ int * conf_state,
+ gss_buffer_t output_message_buffer,
+ krb5_keyblock *key
+ )
+{
+ u_char *p;
+ u_char seq[8];
+ int32_t seq_number;
+ size_t len, total_len, padlength, datalen;
+ uint32_t ret;
+ krb5_crypto crypto;
+ Checksum cksum;
+ krb5_data encdata;
+
+ if (IS_DCE_STYLE(ctx)) {
+ padlength = 0;
+ datalen = input_message_buffer->length;
+ len = 34 + 8;
+ _gsskrb5_encap_length (len, &len, &total_len, GSS_KRB5_MECHANISM);
+ total_len += datalen;
+ datalen += 8;
+ } else {
+ padlength = 8 - (input_message_buffer->length % 8);
+ datalen = input_message_buffer->length + padlength + 8;
+ len = datalen + 34;
+ _gsskrb5_encap_length (len, &len, &total_len, GSS_KRB5_MECHANISM);
+ }
+
+ output_message_buffer->length = total_len;
+ output_message_buffer->value = malloc (total_len);
+ if (output_message_buffer->value == NULL) {
+ output_message_buffer->length = 0;
+ *minor_status = ENOMEM;
+ return GSS_S_FAILURE;
+ }
+
+ p = _gsskrb5_make_header(output_message_buffer->value,
+ len,
+ "\x02\x01", /* TOK_ID */
+ GSS_KRB5_MECHANISM);
+
+ /* SGN_ALG */
+ memcpy (p, "\x04\x00", 2); /* HMAC SHA1 DES3-KD */
+ p += 2;
+ /* SEAL_ALG */
+ if(conf_req_flag)
+ memcpy (p, "\x02\x00", 2); /* DES3-KD */
+ else
+ memcpy (p, "\xff\xff", 2);
+ p += 2;
+ /* Filler */
+ memcpy (p, "\xff\xff", 2);
+ p += 2;
+
+ /* calculate checksum (the above + confounder + data + pad) */
+
+ memcpy (p + 20, p - 8, 8);
+ krb5_generate_random_block(p + 28, 8);
+ memcpy (p + 28 + 8, input_message_buffer->value,
+ input_message_buffer->length);
+ memset (p + 28 + 8 + input_message_buffer->length, padlength, padlength);
+
+ ret = krb5_crypto_init(context, key, 0, &crypto);
+ if (ret) {
+ free (output_message_buffer->value);
+ output_message_buffer->length = 0;
+ output_message_buffer->value = NULL;
+ *minor_status = ret;
+ return GSS_S_FAILURE;
+ }
+
+ ret = krb5_create_checksum (context,
+ crypto,
+ KRB5_KU_USAGE_SIGN,
+ 0,
+ p + 20,
+ datalen + 8,
+ &cksum);
+ krb5_crypto_destroy (context, crypto);
+ if (ret) {
+ free (output_message_buffer->value);
+ output_message_buffer->length = 0;
+ output_message_buffer->value = NULL;
+ *minor_status = ret;
+ return GSS_S_FAILURE;
+ }
+
+ /* zero out SND_SEQ + SGN_CKSUM in case */
+ memset (p, 0, 28);
+
+ memcpy (p + 8, cksum.checksum.data, cksum.checksum.length);
+ free_Checksum (&cksum);
+
+ 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);
+
+
+ ret = krb5_crypto_init(context, key, ETYPE_DES3_CBC_NONE,
+ &crypto);
+ if (ret) {
+ free (output_message_buffer->value);
+ output_message_buffer->length = 0;
+ output_message_buffer->value = NULL;
+ *minor_status = ret;
+ return GSS_S_FAILURE;
+ }
+
+ {
+ DES_cblock ivec;
+
+ memcpy (&ivec, p + 8, 8);
+ ret = krb5_encrypt_ivec (context,
+ crypto,
+ KRB5_KU_USAGE_SEQ,
+ seq, 8, &encdata,
+ &ivec);
+ }
+ krb5_crypto_destroy (context, crypto);
+ if (ret) {
+ free (output_message_buffer->value);
+ output_message_buffer->length = 0;
+ output_message_buffer->value = NULL;
+ *minor_status = ret;
+ 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);
+
+ /* encrypt the data */
+ p += 28;
+
+ if(conf_req_flag) {
+ krb5_data tmp;
+
+ ret = krb5_crypto_init(context, key,
+ ETYPE_DES3_CBC_NONE, &crypto);
+ if (ret) {
+ free (output_message_buffer->value);
+ output_message_buffer->length = 0;
+ output_message_buffer->value = NULL;
+ *minor_status = ret;
+ return GSS_S_FAILURE;
+ }
+ ret = krb5_encrypt(context, crypto, KRB5_KU_USAGE_SEAL,
+ p, datalen, &tmp);
+ krb5_crypto_destroy(context, crypto);
+ if (ret) {
+ free (output_message_buffer->value);
+ output_message_buffer->length = 0;
+ output_message_buffer->value = NULL;
+ *minor_status = ret;
+ return GSS_S_FAILURE;
+ }
+ assert (tmp.length == datalen);
+
+ memcpy (p, tmp.data, datalen);
+ krb5_data_free(&tmp);
+ }
+ if(conf_state != NULL)
+ *conf_state = conf_req_flag;
+ *minor_status = 0;
+ return GSS_S_COMPLETE;
+}
+
+OM_uint32 GSSAPI_CALLCONV
+_gsskrb5_wrap
+ (OM_uint32 * minor_status,
+ gss_const_ctx_id_t context_handle,
+ int conf_req_flag,
+ gss_qop_t qop_req,
+ const gss_buffer_t input_message_buffer,
+ int * conf_state,
+ gss_buffer_t output_message_buffer
+ )
+{
+ krb5_context context;
+ krb5_keyblock *key;
+ OM_uint32 ret;
+ const gsskrb5_ctx ctx = (const gsskrb5_ctx) context_handle;
+
+ output_message_buffer->value = NULL;
+ output_message_buffer->length = 0;
+
+ GSSAPI_KRB5_INIT (&context);
+
+ if (ctx->more_flags & IS_CFX)
+ return _gssapi_wrap_cfx (minor_status, ctx, context, conf_req_flag,
+ input_message_buffer, conf_state,
+ output_message_buffer);
+
+ 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 = wrap_des (minor_status, ctx, context, conf_req_flag,
+ qop_req, input_message_buffer, conf_state,
+ output_message_buffer, key);
+#else
+ ret = GSS_S_FAILURE;
+#endif
+ break;
+ case KRB5_ENCTYPE_DES3_CBC_MD5 :
+ case KRB5_ENCTYPE_DES3_CBC_SHA1 :
+ ret = wrap_des3 (minor_status, ctx, context, conf_req_flag,
+ qop_req, input_message_buffer, conf_state,
+ output_message_buffer, key);
+ break;
+ case KRB5_ENCTYPE_ARCFOUR_HMAC_MD5:
+ case KRB5_ENCTYPE_ARCFOUR_HMAC_MD5_56:
+ ret = _gssapi_wrap_arcfour (minor_status, ctx, context, conf_req_flag,
+ qop_req, input_message_buffer, conf_state,
+ output_message_buffer, key);
+ break;
+ default :
+ abort();
+ break;
+ }
+ krb5_free_keyblock (context, key);
+ return ret;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-23 02:44:33 +0000