diff options
Diffstat (limited to 'php-bug81744.patch')
| -rw-r--r-- | php-bug81744.patch | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/php-bug81744.patch b/php-bug81744.patch new file mode 100644 index 0000000..62296ce --- /dev/null +++ b/php-bug81744.patch @@ -0,0 +1,188 @@ +From 7437aaae38cf4b3357e7580f9e22fd4a403b6c23 Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Tim=20D=C3=BCsterhus?= <tim@bastelstu.be> +Date: Mon, 23 Jan 2023 21:15:24 +0100 +Subject: [PATCH 1/7] crypt: Fix validation of malformed BCrypt hashes +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +PHP’s implementation of crypt_blowfish differs from the upstream Openwall +version by adding a “PHP Hack”, which allows one to cut short the BCrypt salt +by including a `$` character within the characters that represent the salt. + +Hashes that are affected by the “PHP Hack” may erroneously validate any +password as valid when used with `password_verify` and when comparing the +return value of `crypt()` against the input. + +The PHP Hack exists since the first version of PHP’s own crypt_blowfish +implementation that was added in 1e820eca02dcf322b41fd2fe4ed2a6b8309f8ab5. + +No clear reason is given for the PHP Hack’s existence. This commit removes it, +because BCrypt hashes containing a `$` character in their salt are not valid +BCrypt hashes. + +(cherry picked from commit c840f71524067aa474c00c3eacfb83bd860bfc8a) +--- + ext/standard/crypt_blowfish.c | 8 -- + .../tests/crypt/bcrypt_salt_dollar.phpt | 82 +++++++++++++++++++ + 2 files changed, 82 insertions(+), 8 deletions(-) + create mode 100644 ext/standard/tests/crypt/bcrypt_salt_dollar.phpt + +diff --git a/ext/standard/crypt_blowfish.c b/ext/standard/crypt_blowfish.c +index c1f945f29ed..aa7e1bc2e68 100644 +--- a/ext/standard/crypt_blowfish.c ++++ b/ext/standard/crypt_blowfish.c +@@ -376,7 +376,6 @@ static unsigned char BF_atoi64[0x60] = { + #define BF_safe_atoi64(dst, src) \ + { \ + tmp = (unsigned char)(src); \ +- if (tmp == '$') break; /* PHP hack */ \ + if ((unsigned int)(tmp -= 0x20) >= 0x60) return -1; \ + tmp = BF_atoi64[tmp]; \ + if (tmp > 63) return -1; \ +@@ -404,13 +403,6 @@ static int BF_decode(BF_word *dst, const char *src, int size) + *dptr++ = ((c3 & 0x03) << 6) | c4; + } while (dptr < end); + +- if (end - dptr == size) { +- return -1; +- } +- +- while (dptr < end) /* PHP hack */ +- *dptr++ = 0; +- + return 0; + } + +diff --git a/ext/standard/tests/crypt/bcrypt_salt_dollar.phpt b/ext/standard/tests/crypt/bcrypt_salt_dollar.phpt +new file mode 100644 +index 00000000000..32e335f4b08 +--- /dev/null ++++ b/ext/standard/tests/crypt/bcrypt_salt_dollar.phpt +@@ -0,0 +1,82 @@ ++--TEST-- ++bcrypt correctly rejects salts containing $ ++--FILE-- ++<?php ++for ($i = 0; $i < 23; $i++) { ++ $salt = '$2y$04$' . str_repeat('0', $i) . '$'; ++ $result = crypt("foo", $salt); ++ var_dump($salt); ++ var_dump($result); ++ var_dump($result === $salt); ++} ++?> ++--EXPECT-- ++string(8) "$2y$04$$" ++string(2) "*0" ++bool(false) ++string(9) "$2y$04$0$" ++string(2) "*0" ++bool(false) ++string(10) "$2y$04$00$" ++string(2) "*0" ++bool(false) ++string(11) "$2y$04$000$" ++string(2) "*0" ++bool(false) ++string(12) "$2y$04$0000$" ++string(2) "*0" ++bool(false) ++string(13) "$2y$04$00000$" ++string(2) "*0" ++bool(false) ++string(14) "$2y$04$000000$" ++string(2) "*0" ++bool(false) ++string(15) "$2y$04$0000000$" ++string(2) "*0" ++bool(false) ++string(16) "$2y$04$00000000$" ++string(2) "*0" ++bool(false) ++string(17) "$2y$04$000000000$" ++string(2) "*0" ++bool(false) ++string(18) "$2y$04$0000000000$" ++string(2) "*0" ++bool(false) ++string(19) "$2y$04$00000000000$" ++string(2) "*0" ++bool(false) ++string(20) "$2y$04$000000000000$" ++string(2) "*0" ++bool(false) ++string(21) "$2y$04$0000000000000$" ++string(2) "*0" ++bool(false) ++string(22) "$2y$04$00000000000000$" ++string(2) "*0" ++bool(false) ++string(23) "$2y$04$000000000000000$" ++string(2) "*0" ++bool(false) ++string(24) "$2y$04$0000000000000000$" ++string(2) "*0" ++bool(false) ++string(25) "$2y$04$00000000000000000$" ++string(2) "*0" ++bool(false) ++string(26) "$2y$04$000000000000000000$" ++string(2) "*0" ++bool(false) ++string(27) "$2y$04$0000000000000000000$" ++string(2) "*0" ++bool(false) ++string(28) "$2y$04$00000000000000000000$" ++string(2) "*0" ++bool(false) ++string(29) "$2y$04$000000000000000000000$" ++string(2) "*0" ++bool(false) ++string(30) "$2y$04$0000000000000000000000$" ++string(60) "$2y$04$000000000000000000000u2a2UpVexIt9k3FMJeAVr3c04F5tcI8K" ++bool(false) +-- +2.39.1 + +From ed0281b588a6840cb95f3134a4e68847a3be5bb7 Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Tim=20D=C3=BCsterhus?= <tim@bastelstu.be> +Date: Mon, 23 Jan 2023 22:13:57 +0100 +Subject: [PATCH 2/7] crypt: Fix possible buffer overread in php_crypt() + +(cherry picked from commit a92acbad873a05470af1a47cb785a18eadd827b5) +--- + ext/standard/crypt.c | 1 + + ext/standard/tests/password/password_bcrypt_short.phpt | 8 ++++++++ + 2 files changed, 9 insertions(+) + create mode 100644 ext/standard/tests/password/password_bcrypt_short.phpt + +diff --git a/ext/standard/crypt.c b/ext/standard/crypt.c +index 92430b69f77..04487f3fe5a 100644 +--- a/ext/standard/crypt.c ++++ b/ext/standard/crypt.c +@@ -151,6 +151,7 @@ PHPAPI zend_string *php_crypt(const char *password, const int pass_len, const ch + } else if ( + salt[0] == '$' && + salt[1] == '2' && ++ salt[2] != 0 && + salt[3] == '$') { + char output[PHP_MAX_SALT_LEN + 1]; + +diff --git a/ext/standard/tests/password/password_bcrypt_short.phpt b/ext/standard/tests/password/password_bcrypt_short.phpt +new file mode 100644 +index 00000000000..085bc8a2390 +--- /dev/null ++++ b/ext/standard/tests/password/password_bcrypt_short.phpt +@@ -0,0 +1,8 @@ ++--TEST-- ++Test that password_hash() does not overread buffers when a short hash is passed ++--FILE-- ++<?php ++var_dump(password_verify("foo", '$2')); ++?> ++--EXPECT-- ++bool(false) +-- +2.39.1 + |