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libcli:drsuapi: Use GnuTLS MD5 in drsuapi_decrypt_attribute_value()

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Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
This commit is contained in:
Andreas Schneider 2019-05-15 08:07:32 +02:00 committed by Andrew Bartlett
parent 75ee0c83c1
commit 54440f1b30
1 changed files with 35 additions and 8 deletions
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43
libcli/drsuapi/repl_decrypt.c
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@ -32,6 +32,9 @@
#include "libcli/auth/libcli_auth.h"
#include "dsdb/samdb/samdb.h"
#include <gnutls/gnutls.h>
#include <gnutls/crypto.h>
WERROR drsuapi_decrypt_attribute_value(TALLOC_CTX *mem_ctx,
const DATA_BLOB *gensec_skey,
bool rid_crypt,
@ -42,7 +45,7 @@ WERROR drsuapi_decrypt_attribute_value(TALLOC_CTX *mem_ctx,
DATA_BLOB confounder;
DATA_BLOB enc_buffer;
MD5_CTX md5;
gnutls_hash_hd_t hash_hnd = NULL;
uint8_t _enc_key[16];
DATA_BLOB enc_key;
@ -53,6 +56,8 @@ WERROR drsuapi_decrypt_attribute_value(TALLOC_CTX *mem_ctx,
DATA_BLOB checked_buffer;
DATA_BLOB plain_buffer;
WERROR result;
int rc;
/*
* users with rid == 0 should not exist
@ -79,10 +84,26 @@ WERROR drsuapi_decrypt_attribute_value(TALLOC_CTX *mem_ctx,
* not the dcerpc ncacn_ip_tcp "SystemLibraryDTC" key!
*/
enc_key = data_blob_const(_enc_key, sizeof(_enc_key));
MD5Init(&md5);
MD5Update(&md5, gensec_skey->data, gensec_skey->length);
MD5Update(&md5, confounder.data, confounder.length);
MD5Final(enc_key.data, &md5);
rc = gnutls_hash_init(&hash_hnd, GNUTLS_DIG_MD5);
if (rc < 0) {
result = WERR_NOT_ENOUGH_MEMORY;
goto out;
}
rc = gnutls_hash(hash_hnd, gensec_skey->data, gensec_skey->length);
if (rc < 0) {
gnutls_hash_deinit(hash_hnd, NULL);
result = WERR_INTERNAL_ERROR;
goto out;
}
rc = gnutls_hash(hash_hnd, confounder.data, confounder.length);
if (rc < 0) {
gnutls_hash_deinit(hash_hnd, NULL);
result = WERR_INTERNAL_ERROR;
goto out;
}
gnutls_hash_deinit(hash_hnd, enc_key.data);
/*
* copy the encrypted buffer part and
@ -91,6 +112,8 @@ WERROR drsuapi_decrypt_attribute_value(TALLOC_CTX *mem_ctx,
dec_buffer = data_blob_const(enc_buffer.data, enc_buffer.length);
arcfour_crypt_blob(dec_buffer.data, dec_buffer.length, &enc_key);
ZERO_ARRAY_LEN(enc_key.data, enc_key.length);
/*
* the first 4 byte are the crc32 checksum
* of the remaining bytes
@ -106,7 +129,8 @@ WERROR drsuapi_decrypt_attribute_value(TALLOC_CTX *mem_ctx,
W_ERROR_HAVE_NO_MEMORY(plain_buffer.data);
if (crc32_given != crc32_calc) {
return W_ERROR(HRES_ERROR_V(HRES_SEC_E_DECRYPT_FAILURE));
result = W_ERROR(HRES_ERROR_V(HRES_SEC_E_DECRYPT_FAILURE));
goto out;
}
/*
* The following rid_crypt obfuscation isn't session specific
@ -123,7 +147,8 @@ WERROR drsuapi_decrypt_attribute_value(TALLOC_CTX *mem_ctx,
uint32_t i, num_hashes;
if ((checked_buffer.length % 16) != 0) {
return WERR_DS_DRA_INVALID_PARAMETER;
result = WERR_DS_DRA_INVALID_PARAMETER;
goto out;
}
num_hashes = plain_buffer.length / 16;
@ -134,7 +159,9 @@ WERROR drsuapi_decrypt_attribute_value(TALLOC_CTX *mem_ctx,
}
*out = plain_buffer;
return WERR_OK;
result = WERR_OK;
out:
return result;
}
WERROR drsuapi_decrypt_attribute(TALLOC_CTX *mem_ctx,