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-rw-r--r--source3/libsmb/smbencrypt.c66
1 files changed, 66 insertions, 0 deletions
diff --git a/source3/libsmb/smbencrypt.c b/source3/libsmb/smbencrypt.c
index ab61f6b419..8361c35a8e 100644
--- a/source3/libsmb/smbencrypt.c
+++ b/source3/libsmb/smbencrypt.c
@@ -583,3 +583,69 @@ void sess_crypt_blob(DATA_BLOB *out, const DATA_BLOB *in, const DATA_BLOB *sessi
memcpy(&out->data[i], bout, MIN(8, in->length-i));
}
}
+
+/* Decrypts password-blob with session-key
+ * @param pass password for session-key
+ * @param data_in DATA_BLOB encrypted password
+ *
+ * Returns cleartext password in CH_UNIX
+ * Caller must free the returned string
+ */
+
+char *decrypt_trustdom_secret(const char *pass, DATA_BLOB *data_in)
+{
+ DATA_BLOB data_out, sess_key;
+ uchar nt_hash[16];
+ uint32_t length;
+ uint32_t version;
+ fstring cleartextpwd;
+
+ if (!data_in || !pass)
+ return NULL;
+
+ /* generate md4 password-hash derived from the NT UNICODE password */
+ E_md4hash(pass, nt_hash);
+
+ /* hashed twice with md4 */
+ mdfour(nt_hash, nt_hash, 16);
+
+ /* 16-Byte session-key */
+ sess_key = data_blob(nt_hash, 16);
+ if (sess_key.data == NULL)
+ return NULL;
+
+ data_out = data_blob(NULL, data_in->length);
+ if (data_out.data == NULL)
+ return NULL;
+
+ /* decrypt with des3 */
+ sess_crypt_blob(&data_out, data_in, &sess_key, 0);
+
+ /* 4 Byte length, 4 Byte version */
+ length = IVAL(data_out.data, 0);
+ version = IVAL(data_out.data, 4);
+
+ if (length > data_in->length - 8) {
+ DEBUG(0,("decrypt_trustdom_secret: invalid length (%d)\n", length));
+ return NULL;
+ }
+
+ if (version != 1) {
+ DEBUG(0,("decrypt_trustdom_secret: unknown version number (%d)\n", version));
+ return NULL;
+ }
+
+ rpcstr_pull(cleartextpwd, data_out.data + 8, sizeof(fstring), length, 0 );
+
+#ifdef DEBUG_PASSWORD
+ DEBUG(100,("decrypt_trustdom_secret: length is: %d, version is: %d, password is: %s\n",
+ length, version, cleartextpwd));
+#endif
+
+ data_blob_free(&data_out);
+ data_blob_free(&sess_key);
+
+ return SMB_STRDUP(cleartextpwd);
+
+}
+