Add a test of TLS CBC padding verification

See also GH #1227

4 files changed, 88 insertions, 9 deletions

diff --git a/src/lib/tls/tls_cbc/tls_cbc.cpp b/src/lib/tls/tls_cbc/tls_cbc.cpp
index 69aa9725d..e0e631cc7 100644
--- a/src/lib/tls/tls_cbc/tls_cbc.cpp
+++ b/src/lib/tls/tls_cbc/tls_cbc.cpp
@@ -211,9 +211,6 @@ void TLS_CBC_HMAC_AEAD_Encryption::finish(secure_vector<uint8_t>& buffer, size_t
       }
    }
 
-namespace {
-
-
 /*
 * Checks the TLS padding. Returns 0 if the padding is invalid (we
 * count the padding_length field as part of the padding size so a
@@ -225,7 +222,7 @@ namespace {
 * Returning 0 in the error case should ensure the MAC check will fail.
 * This approach is suggested in section 6.2.3.2 of RFC 5246.
 */
-uint16_t check_tls_padding(const uint8_t record[], size_t record_len)
+uint16_t check_tls_cbc_padding(const uint8_t record[], size_t record_len)
    {
    /*
    * TLS v1.0 and up require all the padding bytes be the same value
@@ -246,8 +243,6 @@ uint16_t check_tls_padding(const uint8_t record[], size_t record_len)
    return CT::select<uint16_t>(pad_invalid_mask, 0, pad_byte + 1);
    }
 
-}
-
 void TLS_CBC_HMAC_AEAD_Decryption::cbc_decrypt_record(uint8_t record_contents[], size_t record_len)
    {
    BOTAN_ASSERT(record_len % block_size() == 0,
@@ -315,7 +310,7 @@ size_t TLS_CBC_HMAC_AEAD_Decryption::output_length(size_t) const
 *    no compressions are performed.
 * 
 * Note that the padding validation in Botan is always performed over
-* min(plen,256) bytes, see the function check_tls_padding. This differs
+* min(plen,256) bytes, see the function check_tls_cbc_padding. This differs
 * from the countermeasure described in the paper.
 * 
 * Note that the padding length padlen does also count the last byte
@@ -406,7 +401,7 @@ void TLS_CBC_HMAC_AEAD_Decryption::finish(secure_vector<uint8_t>& buffer, size_t
       cbc_decrypt_record(record_contents, enc_size);
 
       // 0 if padding was invalid, otherwise 1 + padding_bytes
-      uint16_t pad_size = check_tls_padding(record_contents, enc_size);
+      uint16_t pad_size = check_tls_cbc_padding(record_contents, enc_size);
 
       // No oracle here, whoever sent us this had the key since MAC check passed
       if(pad_size == 0)
@@ -426,7 +421,7 @@ void TLS_CBC_HMAC_AEAD_Decryption::finish(secure_vector<uint8_t>& buffer, size_t
       CT::poison(record_contents, record_len);
 
       // 0 if padding was invalid, otherwise 1 + padding_bytes
-      uint16_t pad_size = check_tls_padding(record_contents, record_len);
+      uint16_t pad_size = check_tls_cbc_padding(record_contents, record_len);
 
       /*
       This mask is zero if there is not enough room in the packet to get a valid MAC.
diff --git a/src/lib/tls/tls_cbc/tls_cbc.h b/src/lib/tls/tls_cbc/tls_cbc.h
index d0fc1fb61..f09e0ad39 100644
--- a/src/lib/tls/tls_cbc/tls_cbc.h
+++ b/src/lib/tls/tls_cbc/tls_cbc.h
@@ -166,6 +166,14 @@ class BOTAN_TEST_API TLS_CBC_HMAC_AEAD_Decryption final : public TLS_CBC_HMAC_AE
       void perform_additional_compressions(size_t plen, size_t padlen);
    };
 
+/**
+* Check the TLS padding of a record
+* @param record the record bits
+* @param record_len length of record
+* @return 0 if padding is invalid, otherwise padding_bytes + 1
+*/
+BOTAN_TEST_API uint16_t check_tls_cbc_padding(const uint8_t record[], size_t record_len);
+
 }
 
 }
diff --git a/src/tests/data/tls_cbc.vec b/src/tests/data/tls_cbc.vec
new file mode 100644
index 000000000..51153bb10
--- /dev/null
+++ b/src/tests/data/tls_cbc.vec
@@ -0,0 +1,36 @@
+
+Record = 00
+Output = 1
+
+Record = 0101
+Output = 2
+
+Record = 0201
+Output = 0
+
+Record = 09030303
+Output = 0
+
+Record = 0903030303
+Output = 4
+
+Record = FFFFFFFFFFFFFFFFFF03030303
+Output = 4
+
+Record = FFFFFF00
+Output = 1
+
+Record = FFFFFF01010101
+Output = 2
+
+Record = FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00
+Output = 1
+
+Record = FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF090909090909090909090909
+Output = 10
+
+Record =  @                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            QEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQE
+Output = 256
+
+Record =  @                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            QEMQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQEQE
+Output = 0
diff --git a/src/tests/test_tls_cbc.cpp b/src/tests/test_tls_cbc.cpp
new file mode 100644
index 000000000..5ff242806
--- /dev/null
+++ b/src/tests/test_tls_cbc.cpp
@@ -0,0 +1,40 @@
+/*
+* (C) 2017 Jack Lloyd
+*
+* Botan is released under the Simplified BSD License (see license.txt)
+*/
+
+#include "tests.h"
+
+#if defined(BOTAN_HAS_TLS_CBC)
+   #include <botan/internal/tls_cbc.h>
+#endif
+
+namespace Botan_Tests {
+
+#if defined(BOTAN_HAS_TLS_CBC)
+
+class TLS_CBC_Padding_Tests : public Text_Based_Test
+   {
+   public:
+      TLS_CBC_Padding_Tests() : Text_Based_Test("tls_cbc.vec", "Record,Output") {}
+
+      Test::Result run_one_test(const std::string& algo, const VarMap& vars) override
+         {
+         const std::vector<uint8_t> record    = get_req_bin(vars, "Record");
+         const size_t output = get_req_sz(vars, "Output");
+
+         uint16_t res = Botan::TLS::check_tls_cbc_padding(record.data(), record.size());
+
+         Test::Result result("TLS CBC padding check");
+         result.test_eq("Expected", res, output);
+         return result;
+         }
+   };
+
+BOTAN_REGISTER_TEST("tls_cbc_padding", TLS_CBC_Padding_Tests);
+
+#endif
+
+}
+