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From f2cf3afc6fa1e13e960f732c0bc658ad408ee219 Mon Sep 17 00:00:00 2001
From: Kazuki Yamaguchi <[email protected]>
Date: Fri, 12 Jun 2020 14:12:59 +0900
Subject: [PATCH 1/3] pkey: fix potential memory leak in PKey#sign
Fix potential leak of EVP_MD_CTX object in an error path. This path is
normally unreachable, since the size of a signature generated by any
supported algorithms would not be larger than LONG_MAX.
---
ext/openssl/ossl_pkey.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/ext/openssl/ossl_pkey.c b/ext/openssl/ossl_pkey.c
index df8b425a0f..7488190e0e 100644
--- a/ext/openssl/ossl_pkey.c
+++ b/ext/openssl/ossl_pkey.c
@@ -777,8 +777,10 @@ ossl_pkey_sign(VALUE self, VALUE digest, VALUE data)
EVP_MD_CTX_free(ctx);
ossl_raise(ePKeyError, "EVP_DigestSign");
}
- if (siglen > LONG_MAX)
+ if (siglen > LONG_MAX) {
+ EVP_MD_CTX_free(ctx);
rb_raise(ePKeyError, "signature would be too large");
+ }
sig = ossl_str_new(NULL, (long)siglen, &state);
if (state) {
EVP_MD_CTX_free(ctx);
@@ -799,8 +801,10 @@ ossl_pkey_sign(VALUE self, VALUE digest, VALUE data)
EVP_MD_CTX_free(ctx);
ossl_raise(ePKeyError, "EVP_DigestSignFinal");
}
- if (siglen > LONG_MAX)
+ if (siglen > LONG_MAX) {
+ EVP_MD_CTX_free(ctx);
rb_raise(ePKeyError, "signature would be too large");
+ }
sig = ossl_str_new(NULL, (long)siglen, &state);
if (state) {
EVP_MD_CTX_free(ctx);
--
2.32.0
From 8b30ce20eb9e03180c28288e29a96308e594f860 Mon Sep 17 00:00:00 2001
From: Kazuki Yamaguchi <[email protected]>
Date: Fri, 2 Apr 2021 23:58:48 +0900
Subject: [PATCH 2/3] pkey: prepare pkey_ctx_apply_options() for usage by other
operations
The routine to apply Hash to EVP_PKEY_CTX_ctrl_str() is currently used
by key generation, but it is useful for other operations too. Let's
change it to a slightly more generic name.
---
ext/openssl/ossl_pkey.c | 22 ++++++++++++++--------
1 file changed, 14 insertions(+), 8 deletions(-)
diff --git a/ext/openssl/ossl_pkey.c b/ext/openssl/ossl_pkey.c
index 7488190e0e..fed4a2b81f 100644
--- a/ext/openssl/ossl_pkey.c
+++ b/ext/openssl/ossl_pkey.c
@@ -198,7 +198,7 @@ ossl_pkey_new_from_data(int argc, VALUE *argv, VALUE self)
}
static VALUE
-pkey_gen_apply_options_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, ctx_v))
+pkey_ctx_apply_options_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, ctx_v))
{
VALUE key = rb_ary_entry(i, 0), value = rb_ary_entry(i, 1);
EVP_PKEY_CTX *ctx = (EVP_PKEY_CTX *)ctx_v;
@@ -214,15 +214,25 @@ pkey_gen_apply_options_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, ctx_v))
}
static VALUE
-pkey_gen_apply_options0(VALUE args_v)
+pkey_ctx_apply_options0(VALUE args_v)
{
VALUE *args = (VALUE *)args_v;
rb_block_call(args[1], rb_intern("each"), 0, NULL,
- pkey_gen_apply_options_i, args[0]);
+ pkey_ctx_apply_options_i, args[0]);
return Qnil;
}
+static void
+pkey_ctx_apply_options(EVP_PKEY_CTX *ctx, VALUE options, int *state)
+{
+ VALUE args[2];
+ args[0] = (VALUE)ctx;
+ args[1] = options;
+
+ rb_protect(pkey_ctx_apply_options0, (VALUE)args, state);
+}
+
struct pkey_blocking_generate_arg {
EVP_PKEY_CTX *ctx;
EVP_PKEY *pkey;
@@ -330,11 +340,7 @@ pkey_generate(int argc, VALUE *argv, VALUE self, int genparam)
}
if (!NIL_P(options)) {
- VALUE args[2];
-
- args[0] = (VALUE)ctx;
- args[1] = options;
- rb_protect(pkey_gen_apply_options0, (VALUE)args, &state);
+ pkey_ctx_apply_options(ctx, options, &state);
if (state) {
EVP_PKEY_CTX_free(ctx);
rb_jump_tag(state);
--
2.32.0
From 4c7b0f91da666961d11908b94520db4e09ce4e67 Mon Sep 17 00:00:00 2001
From: Kazuki Yamaguchi <[email protected]>
Date: Sat, 18 Jul 2020 20:40:39 +0900
Subject: [PATCH 3/3] pkey: allow setting algorithm-specific options in #sign
and #verify
Similarly to OpenSSL::PKey.generate_key and .generate_parameters, let
OpenSSL::PKey::PKey#sign and #verify take an optional parameter for
specifying control strings for EVP_PKEY_CTX_ctrl_str().
---
ext/openssl/ossl_pkey.c | 113 ++++++++++++++++++++++------------
test/openssl/test_pkey_rsa.rb | 34 +++++-----
2 files changed, 89 insertions(+), 58 deletions(-)
diff --git a/ext/openssl/ossl_pkey.c b/ext/openssl/ossl_pkey.c
index fed4a2b81f..22e9f19982 100644
--- a/ext/openssl/ossl_pkey.c
+++ b/ext/openssl/ossl_pkey.c
@@ -739,33 +739,51 @@ ossl_pkey_public_to_pem(VALUE self)
}
/*
- * call-seq:
- * pkey.sign(digest, data) -> String
+ * call-seq:
+ * pkey.sign(digest, data [, options]) -> string
*
- * To sign the String _data_, _digest_, an instance of OpenSSL::Digest, must
- * be provided. The return value is again a String containing the signature.
- * A PKeyError is raised should errors occur.
- * Any previous state of the Digest instance is irrelevant to the signature
- * outcome, the digest instance is reset to its initial state during the
- * operation.
+ * Hashes and signs the +data+ using a message digest algorithm +digest+ and
+ * a private key +pkey+.
*
- * == Example
- * data = 'Sign me!'
- * digest = OpenSSL::Digest.new('SHA256')
- * pkey = OpenSSL::PKey::RSA.new(2048)
- * signature = pkey.sign(digest, data)
+ * See #verify for the verification operation.
+ *
+ * See also the man page EVP_DigestSign(3).
+ *
+ * +digest+::
+ * A String that represents the message digest algorithm name, or +nil+
+ * if the PKey type requires no digest algorithm.
+ * For backwards compatibility, this can be an instance of OpenSSL::Digest.
+ * Its state will not affect the signature.
+ * +data+::
+ * A String. The data to be hashed and signed.
+ * +options+::
+ * A Hash that contains algorithm specific control operations to \OpenSSL.
+ * See OpenSSL's man page EVP_PKEY_CTX_ctrl_str(3) for details.
+ * +options+ parameter was added in version 2.3.
+ *
+ * Example:
+ * data = "Sign me!"
+ * pkey = OpenSSL::PKey.generate_key("RSA", rsa_keygen_bits: 2048)
+ * signopts = { rsa_padding_mode: "pss" }
+ * signature = pkey.sign("SHA256", data, signopts)
+ *
+ * # Creates a copy of the RSA key pkey, but without the private components
+ * pub_key = pkey.public_key
+ * puts pub_key.verify("SHA256", signature, data, signopts) # => true
*/
static VALUE
-ossl_pkey_sign(VALUE self, VALUE digest, VALUE data)
+ossl_pkey_sign(int argc, VALUE *argv, VALUE self)
{
EVP_PKEY *pkey;
+ VALUE digest, data, options, sig;
const EVP_MD *md = NULL;
EVP_MD_CTX *ctx;
+ EVP_PKEY_CTX *pctx;
size_t siglen;
int state;
- VALUE sig;
pkey = GetPrivPKeyPtr(self);
+ rb_scan_args(argc, argv, "21", &digest, &data, &options);
if (!NIL_P(digest))
md = ossl_evp_get_digestbyname(digest);
StringValue(data);
@@ -773,10 +791,17 @@ ossl_pkey_sign(VALUE self, VALUE digest, VALUE data)
ctx = EVP_MD_CTX_new();
if (!ctx)
ossl_raise(ePKeyError, "EVP_MD_CTX_new");
- if (EVP_DigestSignInit(ctx, NULL, md, /* engine */NULL, pkey) < 1) {
+ if (EVP_DigestSignInit(ctx, &pctx, md, /* engine */NULL, pkey) < 1) {
EVP_MD_CTX_free(ctx);
ossl_raise(ePKeyError, "EVP_DigestSignInit");
}
+ if (!NIL_P(options)) {
+ pkey_ctx_apply_options(pctx, options, &state);
+ if (state) {
+ EVP_MD_CTX_free(ctx);
+ rb_jump_tag(state);
+ }
+ }
#if OPENSSL_VERSION_NUMBER >= 0x10101000 && !defined(LIBRESSL_VERSION_NUMBER)
if (EVP_DigestSign(ctx, NULL, &siglen, (unsigned char *)RSTRING_PTR(data),
RSTRING_LEN(data)) < 1) {
@@ -828,35 +853,40 @@ ossl_pkey_sign(VALUE self, VALUE digest, VALUE data)
}
/*
- * call-seq:
- * pkey.verify(digest, signature, data) -> String
+ * call-seq:
+ * pkey.verify(digest, signature, data [, options]) -> true or false
*
- * To verify the String _signature_, _digest_, an instance of
- * OpenSSL::Digest, must be provided to re-compute the message digest of the
- * original _data_, also a String. The return value is +true+ if the
- * signature is valid, +false+ otherwise. A PKeyError is raised should errors
- * occur.
- * Any previous state of the Digest instance is irrelevant to the validation
- * outcome, the digest instance is reset to its initial state during the
- * operation.
+ * Verifies the +signature+ for the +data+ using a message digest algorithm
+ * +digest+ and a public key +pkey+.
*
- * == Example
- * data = 'Sign me!'
- * digest = OpenSSL::Digest.new('SHA256')
- * pkey = OpenSSL::PKey::RSA.new(2048)
- * signature = pkey.sign(digest, data)
- * pub_key = pkey.public_key
- * puts pub_key.verify(digest, signature, data) # => true
+ * Returns +true+ if the signature is successfully verified, +false+ otherwise.
+ * The caller must check the return value.
+ *
+ * See #sign for the signing operation and an example.
+ *
+ * See also the man page EVP_DigestVerify(3).
+ *
+ * +digest+::
+ * See #sign.
+ * +signature+::
+ * A String containing the signature to be verified.
+ * +data+::
+ * See #sign.
+ * +options+::
+ * See #sign. +options+ parameter was added in version 2.3.
*/
static VALUE
-ossl_pkey_verify(VALUE self, VALUE digest, VALUE sig, VALUE data)
+ossl_pkey_verify(int argc, VALUE *argv, VALUE self)
{
EVP_PKEY *pkey;
+ VALUE digest, sig, data, options;
const EVP_MD *md = NULL;
EVP_MD_CTX *ctx;
- int ret;
+ EVP_PKEY_CTX *pctx;
+ int state, ret;
GetPKey(self, pkey);
+ rb_scan_args(argc, argv, "31", &digest, &sig, &data, &options);
ossl_pkey_check_public_key(pkey);
if (!NIL_P(digest))
md = ossl_evp_get_digestbyname(digest);
@@ -866,10 +896,17 @@ ossl_pkey_verify(VALUE self, VALUE digest, VALUE sig, VALUE data)
ctx = EVP_MD_CTX_new();
if (!ctx)
ossl_raise(ePKeyError, "EVP_MD_CTX_new");
- if (EVP_DigestVerifyInit(ctx, NULL, md, /* engine */NULL, pkey) < 1) {
+ if (EVP_DigestVerifyInit(ctx, &pctx, md, /* engine */NULL, pkey) < 1) {
EVP_MD_CTX_free(ctx);
ossl_raise(ePKeyError, "EVP_DigestVerifyInit");
}
+ if (!NIL_P(options)) {
+ pkey_ctx_apply_options(pctx, options, &state);
+ if (state) {
+ EVP_MD_CTX_free(ctx);
+ rb_jump_tag(state);
+ }
+ }
#if OPENSSL_VERSION_NUMBER >= 0x10101000 && !defined(LIBRESSL_VERSION_NUMBER)
ret = EVP_DigestVerify(ctx, (unsigned char *)RSTRING_PTR(sig),
RSTRING_LEN(sig), (unsigned char *)RSTRING_PTR(data),
@@ -1042,8 +1079,8 @@ Init_ossl_pkey(void)
rb_define_method(cPKey, "public_to_der", ossl_pkey_public_to_der, 0);
rb_define_method(cPKey, "public_to_pem", ossl_pkey_public_to_pem, 0);
- rb_define_method(cPKey, "sign", ossl_pkey_sign, 2);
- rb_define_method(cPKey, "verify", ossl_pkey_verify, 3);
+ rb_define_method(cPKey, "sign", ossl_pkey_sign, -1);
+ rb_define_method(cPKey, "verify", ossl_pkey_verify, -1);
rb_define_method(cPKey, "derive", ossl_pkey_derive, -1);
id_private_q = rb_intern("private?");
diff --git a/test/openssl/test_pkey_rsa.rb b/test/openssl/test_pkey_rsa.rb
index 88164c3b52..d1e68dbc9f 100644
--- a/test/openssl/test_pkey_rsa.rb
+++ b/test/openssl/test_pkey_rsa.rb
@@ -117,27 +117,21 @@ def test_sign_verify
assert_equal false, rsa1024.verify("SHA256", signature1, data)
end
- def test_digest_state_irrelevant_sign
+ def test_sign_verify_options
key = Fixtures.pkey("rsa1024")
- digest1 = OpenSSL::Digest.new('SHA1')
- digest2 = OpenSSL::Digest.new('SHA1')
- data = 'Sign me!'
- digest1 << 'Change state of digest1'
- sig1 = key.sign(digest1, data)
- sig2 = key.sign(digest2, data)
- assert_equal(sig1, sig2)
- end
-
- def test_digest_state_irrelevant_verify
- key = Fixtures.pkey("rsa1024")
- digest1 = OpenSSL::Digest.new('SHA1')
- digest2 = OpenSSL::Digest.new('SHA1')
- data = 'Sign me!'
- sig = key.sign(digest1, data)
- digest1.reset
- digest1 << 'Change state of digest1'
- assert(key.verify(digest1, sig, data))
- assert(key.verify(digest2, sig, data))
+ data = "Sign me!"
+ pssopts = {
+ "rsa_padding_mode" => "pss",
+ "rsa_pss_saltlen" => 20,
+ "rsa_mgf1_md" => "SHA1"
+ }
+ sig_pss = key.sign("SHA256", data, pssopts)
+ assert_equal 128, sig_pss.bytesize
+ assert_equal true, key.verify("SHA256", sig_pss, data, pssopts)
+ assert_equal true, key.verify_pss("SHA256", sig_pss, data,
+ salt_length: 20, mgf1_hash: "SHA1")
+ # Defaults to PKCS #1 v1.5 padding => verification failure
+ assert_equal false, key.verify("SHA256", sig_pss, data)
end
def test_verify_empty_rsa
--
2.32.0
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