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-rw-r--r--doc/client_lua_api.txt4
-rw-r--r--doc/lua_api.txt4
-rw-r--r--src/unittest/test_utilities.cpp93
-rw-r--r--src/util/base64.cpp29
4 files changed, 124 insertions, 6 deletions
diff --git a/doc/client_lua_api.txt b/doc/client_lua_api.txt
index 1e8015f7b..d239594f7 100644
--- a/doc/client_lua_api.txt
+++ b/doc/client_lua_api.txt
@@ -910,7 +910,9 @@ Call these functions only at load time!
* Example: `minetest.rgba(10, 20, 30, 40)`, returns `"#0A141E28"`
* `minetest.encode_base64(string)`: returns string encoded in base64
* Encodes a string in base64.
-* `minetest.decode_base64(string)`: returns string
+* `minetest.decode_base64(string)`: returns string or nil on failure
+ * Padding characters are only supported starting at version 5.4.0, where
+ 5.5.0 and newer perform proper checks.
* Decodes a string encoded in base64.
* `minetest.gettext(string)` : returns string
* look up the translation of a string in the gettext message catalog
diff --git a/doc/lua_api.txt b/doc/lua_api.txt
index 6c7ae0fb5..956919c89 100644
--- a/doc/lua_api.txt
+++ b/doc/lua_api.txt
@@ -5773,7 +5773,9 @@ Misc.
* Example: `minetest.rgba(10, 20, 30, 40)`, returns `"#0A141E28"`
* `minetest.encode_base64(string)`: returns string encoded in base64
* Encodes a string in base64.
-* `minetest.decode_base64(string)`: returns string or nil for invalid base64
+* `minetest.decode_base64(string)`: returns string or nil on failure
+ * Padding characters are only supported starting at version 5.4.0, where
+ 5.5.0 and newer perform proper checks.
* Decodes a string encoded in base64.
* `minetest.is_protected(pos, name)`: returns boolean
* Returning `true` restricts the player `name` from modifying (i.e. digging,
diff --git a/src/unittest/test_utilities.cpp b/src/unittest/test_utilities.cpp
index 93ba3f844..039110d54 100644
--- a/src/unittest/test_utilities.cpp
+++ b/src/unittest/test_utilities.cpp
@@ -23,6 +23,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
#include "util/enriched_string.h"
#include "util/numeric.h"
#include "util/string.h"
+#include "util/base64.h"
class TestUtilities : public TestBase {
public:
@@ -56,6 +57,7 @@ public:
void testMyround();
void testStringJoin();
void testEulerConversion();
+ void testBase64();
};
static TestUtilities g_test_instance;
@@ -87,6 +89,7 @@ void TestUtilities::runTests(IGameDef *gamedef)
TEST(testMyround);
TEST(testStringJoin);
TEST(testEulerConversion);
+ TEST(testBase64);
}
////////////////////////////////////////////////////////////////////////////////
@@ -537,3 +540,93 @@ void TestUtilities::testEulerConversion()
setPitchYawRoll(m2, v2);
UASSERT(within(m1, m2, tolL));
}
+
+void TestUtilities::testBase64()
+{
+ // Test character set
+ UASSERT(base64_is_valid("ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+ "abcdefghijklmnopqrstuvwxyz"
+ "0123456789+/") == true);
+ UASSERT(base64_is_valid("/+9876543210"
+ "zyxwvutsrqponmlkjihgfedcba"
+ "ZYXWVUTSRQPONMLKJIHGFEDCBA") == true);
+ UASSERT(base64_is_valid("ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+ "abcdefghijklmnopqrstuvwxyz"
+ "0123456789+.") == false);
+ UASSERT(base64_is_valid("ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+ "abcdefghijklmnopqrstuvwxyz"
+ "0123456789 /") == false);
+
+ // Test empty string
+ UASSERT(base64_is_valid("") == true);
+
+ // Test different lengths, with and without padding,
+ // with correct and incorrect padding
+ UASSERT(base64_is_valid("A") == false);
+ UASSERT(base64_is_valid("AA") == true);
+ UASSERT(base64_is_valid("AAA") == true);
+ UASSERT(base64_is_valid("AAAA") == true);
+ UASSERT(base64_is_valid("AAAAA") == false);
+ UASSERT(base64_is_valid("AAAAAA") == true);
+ UASSERT(base64_is_valid("AAAAAAA") == true);
+ UASSERT(base64_is_valid("AAAAAAAA") == true);
+ UASSERT(base64_is_valid("A===") == false);
+ UASSERT(base64_is_valid("AA==") == true);
+ UASSERT(base64_is_valid("AAA=") == true);
+ UASSERT(base64_is_valid("AAAA") == true);
+ UASSERT(base64_is_valid("AAAA====") == false);
+ UASSERT(base64_is_valid("AAAAA===") == false);
+ UASSERT(base64_is_valid("AAAAAA==") == true);
+ UASSERT(base64_is_valid("AAAAAAA=") == true);
+ UASSERT(base64_is_valid("AAAAAAA==") == false);
+ UASSERT(base64_is_valid("AAAAAAA===") == false);
+ UASSERT(base64_is_valid("AAAAAAA====") == false);
+ UASSERT(base64_is_valid("AAAAAAAA") == true);
+ UASSERT(base64_is_valid("AAAAAAAA=") == false);
+ UASSERT(base64_is_valid("AAAAAAAA==") == false);
+ UASSERT(base64_is_valid("AAAAAAAA===") == false);
+ UASSERT(base64_is_valid("AAAAAAAA====") == false);
+
+ // Test if canonical encoding
+ // Last character limitations, length % 4 == 3
+ UASSERT(base64_is_valid("AAB") == false);
+ UASSERT(base64_is_valid("AAE") == true);
+ UASSERT(base64_is_valid("AAQ") == true);
+ UASSERT(base64_is_valid("AAB=") == false);
+ UASSERT(base64_is_valid("AAE=") == true);
+ UASSERT(base64_is_valid("AAQ=") == true);
+ UASSERT(base64_is_valid("AAAAAAB=") == false);
+ UASSERT(base64_is_valid("AAAAAAE=") == true);
+ UASSERT(base64_is_valid("AAAAAAQ=") == true);
+ // Last character limitations, length % 4 == 2
+ UASSERT(base64_is_valid("AB") == false);
+ UASSERT(base64_is_valid("AE") == false);
+ UASSERT(base64_is_valid("AQ") == true);
+ UASSERT(base64_is_valid("AB==") == false);
+ UASSERT(base64_is_valid("AE==") == false);
+ UASSERT(base64_is_valid("AQ==") == true);
+ UASSERT(base64_is_valid("AAAAAB==") == false);
+ UASSERT(base64_is_valid("AAAAAE==") == false);
+ UASSERT(base64_is_valid("AAAAAQ==") == true);
+
+ // Extraneous character present
+ UASSERT(base64_is_valid(".") == false);
+ UASSERT(base64_is_valid("A.") == false);
+ UASSERT(base64_is_valid("AA.") == false);
+ UASSERT(base64_is_valid("AAA.") == false);
+ UASSERT(base64_is_valid("AAAA.") == false);
+ UASSERT(base64_is_valid("AAAAA.") == false);
+ UASSERT(base64_is_valid("A.A") == false);
+ UASSERT(base64_is_valid("AA.A") == false);
+ UASSERT(base64_is_valid("AAA.A") == false);
+ UASSERT(base64_is_valid("AAAA.A") == false);
+ UASSERT(base64_is_valid("AAAAA.A") == false);
+ UASSERT(base64_is_valid("\xE1""AAA") == false);
+
+ // Padding in wrong position
+ UASSERT(base64_is_valid("A=A") == false);
+ UASSERT(base64_is_valid("AA=A") == false);
+ UASSERT(base64_is_valid("AAA=A") == false);
+ UASSERT(base64_is_valid("AAAA=A") == false);
+ UASSERT(base64_is_valid("AAAAA=A") == false);
+} \ No newline at end of file
diff --git a/src/util/base64.cpp b/src/util/base64.cpp
index 6e1584410..0c2455222 100644
--- a/src/util/base64.cpp
+++ b/src/util/base64.cpp
@@ -33,18 +33,39 @@ static const std::string base64_chars =
"abcdefghijklmnopqrstuvwxyz"
"0123456789+/";
+static const std::string base64_chars_padding_1 = "AEIMQUYcgkosw048";
+static const std::string base64_chars_padding_2 = "AQgw";
static inline bool is_base64(unsigned char c)
{
- return isalnum(c) || c == '+' || c == '/' || c == '=';
+ return (c >= '0' && c <= '9')
+ || (c >= 'A' && c <= 'Z')
+ || (c >= 'a' && c <= 'z')
+ || c == '+' || c == '/';
}
bool base64_is_valid(std::string const& s)
{
- for (char i : s)
- if (!is_base64(i))
+ size_t i = 0;
+ for (; i < s.size(); ++i)
+ if (!is_base64(s[i]))
+ break;
+ unsigned char padding = 3 - ((i + 3) % 4);
+ if ((padding == 1 && base64_chars_padding_1.find(s[i - 1]) == std::string::npos)
+ || (padding == 2 && base64_chars_padding_2.find(s[i - 1]) == std::string::npos)
+ || padding == 3)
+ return false;
+ int actual_padding = s.size() - i;
+ // omission of padding characters is allowed
+ if (actual_padding == 0)
+ return true;
+
+ // remaining characters (max. 2) may only be padding
+ for (; i < s.size(); ++i)
+ if (s[i] != '=')
return false;
- return true;
+ // number of padding characters needs to match
+ return padding == actual_padding;
}
std::string base64_encode(unsigned char const* bytes_to_encode, unsigned int in_len) {
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-26 19:06:28 +0000