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Fix memory leak with X509V3_ADD_DELETE.

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It seems no one has ever exercised this mode to notice it doesn't work.
Add a test for this, which catches the memory leak. See also
https://github.com/openssl/openssl/issues/18677

Change-Id: I8890febc71decd553a040bdda8739f68ed616c39
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/53285
Commit-Queue: David Benjamin <davidben@google.com>
Reviewed-by: Bob Beck <bbe@google.com>
Commit-Queue: Bob Beck <bbe@google.com>
chromium-5359
David Benjamin 3 years ago committed by Boringssl LUCI CQ
parent f2029899b2
commit 7528f03c8a
2 changed files with 163 additions and 1 deletions
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  1. 160
      crypto/x509/x509_test.cc
  2. 4
      crypto/x509v3/v3_lib.c

160
crypto/x509/x509_test.cc
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@ -4388,3 +4388,163 @@ TEST(X509Test, Print) {
40:86
)");
}
TEST(X509Test, AddExt) {
bssl::UniquePtr<X509> x509(X509_new());
ASSERT_TRUE(x509);
struct Extension {
int nid;
bool critical;
std::vector<uint8_t> data;
};
auto expect_extensions = [&](const std::vector<Extension> &exts) {
ASSERT_EQ(static_cast<size_t>(X509_get_ext_count(x509.get())), exts.size());
for (size_t i = 0; i < exts.size(); i++) {
SCOPED_TRACE(i);
X509_EXTENSION *ext = X509_get_ext(x509.get(), static_cast<int>(i));
EXPECT_EQ(OBJ_obj2nid(X509_EXTENSION_get_object(ext)), exts[i].nid);
EXPECT_EQ(X509_EXTENSION_get_critical(ext), exts[i].critical ? 1 : 0);
ASN1_OCTET_STRING *data = X509_EXTENSION_get_data(ext);
EXPECT_EQ(Bytes(ASN1_STRING_get0_data(data), ASN1_STRING_length(data)),
Bytes(exts[i].data));
}
};
// Make a few sample extensions.
// SEQUENCE {}
std::vector<uint8_t> basic1_der = {0x30, 0x00};
const uint8_t *inp = basic1_der.data();
bssl::UniquePtr<BASIC_CONSTRAINTS> basic1_obj(
d2i_BASIC_CONSTRAINTS(nullptr, &inp, basic1_der.size()));
EXPECT_EQ(inp, basic1_der.data() + basic1_der.size());
// SEQUENCE { BOOLEAN { TRUE } }
std::vector<uint8_t> basic2_der = {0x30, 0x03, 0x01, 0x01, 0xff};
inp = basic2_der.data();
bssl::UniquePtr<BASIC_CONSTRAINTS> basic2_obj(
d2i_BASIC_CONSTRAINTS(nullptr, &inp, basic2_der.size()));
EXPECT_EQ(inp, basic2_der.data() + basic2_der.size());
// OCTET_STRING {}
std::vector<uint8_t> skid1_der = {0x04, 0x00};
inp = skid1_der.data();
bssl::UniquePtr<ASN1_OCTET_STRING> skid1_obj(
d2i_ASN1_OCTET_STRING(nullptr, &inp, skid1_der.size()));
EXPECT_EQ(inp, skid1_der.data() + skid1_der.size());
// OCTET_STRING { "a" }
std::vector<uint8_t> skid2_der = {0x04, 0x01, 0x61};
inp = skid2_der.data();
bssl::UniquePtr<ASN1_OCTET_STRING> skid2_obj(
d2i_ASN1_OCTET_STRING(nullptr, &inp, skid2_der.size()));
EXPECT_EQ(inp, skid2_der.data() + skid2_der.size());
// Initially, the extension list is empty.
expect_extensions({});
// Adding extensions works with the default settings.
EXPECT_EQ(
1, X509_add1_ext_i2d(x509.get(), NID_basic_constraints, basic1_obj.get(),
/*crit=*/1, X509V3_ADD_DEFAULT));
expect_extensions({{NID_basic_constraints, true, basic1_der}});
EXPECT_EQ(1, X509_add1_ext_i2d(x509.get(), NID_subject_key_identifier,
skid1_obj.get(),
/*crit=*/0, X509V3_ADD_DEFAULT));
expect_extensions({{NID_basic_constraints, true, basic1_der},
{NID_subject_key_identifier, false, skid1_der}});
// By default, we cannot add duplicates.
EXPECT_EQ(
0, X509_add1_ext_i2d(x509.get(), NID_basic_constraints, basic2_obj.get(),
/*crit=*/0, X509V3_ADD_DEFAULT));
expect_extensions({{NID_basic_constraints, true, basic1_der},
{NID_subject_key_identifier, false, skid1_der}});
// |X509V3_ADD_KEEP_EXISTING| silently keeps the existing extension if already
// present.
EXPECT_EQ(
1, X509_add1_ext_i2d(x509.get(), NID_basic_constraints, basic2_obj.get(),
/*crit=*/0, X509V3_ADD_KEEP_EXISTING));
expect_extensions({{NID_basic_constraints, true, basic1_der},
{NID_subject_key_identifier, false, skid1_der}});
// |X509V3_ADD_REPLACE| replaces it.
EXPECT_EQ(
1, X509_add1_ext_i2d(x509.get(), NID_basic_constraints, basic2_obj.get(),
/*crit=*/0, X509V3_ADD_REPLACE));
expect_extensions({{NID_basic_constraints, false, basic2_der},
{NID_subject_key_identifier, false, skid1_der}});
// |X509V3_ADD_REPLACE_EXISTING| also replaces matches.
EXPECT_EQ(1, X509_add1_ext_i2d(x509.get(), NID_subject_key_identifier,
skid2_obj.get(),
/*crit=*/1, X509V3_ADD_REPLACE_EXISTING));
expect_extensions({{NID_basic_constraints, false, basic2_der},
{NID_subject_key_identifier, true, skid2_der}});
// |X509V3_ADD_DELETE| ignores the value and deletes the extension.
EXPECT_EQ(1, X509_add1_ext_i2d(x509.get(), NID_basic_constraints, nullptr, 0,
X509V3_ADD_DELETE));
expect_extensions({{NID_subject_key_identifier, true, skid2_der}});
// Not finding an extension to delete is an error.
EXPECT_EQ(0, X509_add1_ext_i2d(x509.get(), NID_basic_constraints, nullptr, 0,
X509V3_ADD_DELETE));
expect_extensions({{NID_subject_key_identifier, true, skid2_der}});
// |X509V3_ADD_REPLACE_EXISTING| fails if it cannot find a match.
EXPECT_EQ(
0, X509_add1_ext_i2d(x509.get(), NID_basic_constraints, basic1_obj.get(),
/*crit=*/1, X509V3_ADD_REPLACE_EXISTING));
expect_extensions({{NID_subject_key_identifier, true, skid2_der}});
// |X509V3_ADD_REPLACE| adds a new extension if not preseent.
EXPECT_EQ(
1, X509_add1_ext_i2d(x509.get(), NID_basic_constraints, basic1_obj.get(),
/*crit=*/1, X509V3_ADD_REPLACE));
expect_extensions({{NID_subject_key_identifier, true, skid2_der},
{NID_basic_constraints, true, basic1_der}});
// Delete the extension again.
EXPECT_EQ(1, X509_add1_ext_i2d(x509.get(), NID_basic_constraints, nullptr, 0,
X509V3_ADD_DELETE));
expect_extensions({{NID_subject_key_identifier, true, skid2_der}});
// |X509V3_ADD_KEEP_EXISTING| adds a new extension if not preseent.
EXPECT_EQ(
1, X509_add1_ext_i2d(x509.get(), NID_basic_constraints, basic1_obj.get(),
/*crit=*/1, X509V3_ADD_KEEP_EXISTING));
expect_extensions({{NID_subject_key_identifier, true, skid2_der},
{NID_basic_constraints, true, basic1_der}});
// Delete the extension again.
EXPECT_EQ(1, X509_add1_ext_i2d(x509.get(), NID_basic_constraints, nullptr, 0,
X509V3_ADD_DELETE));
expect_extensions({{NID_subject_key_identifier, true, skid2_der}});
// |X509V3_ADD_APPEND| adds a new extension if not present.
EXPECT_EQ(
1, X509_add1_ext_i2d(x509.get(), NID_basic_constraints, basic1_obj.get(),
/*crit=*/1, X509V3_ADD_APPEND));
expect_extensions({{NID_subject_key_identifier, true, skid2_der},
{NID_basic_constraints, true, basic1_der}});
// |X509V3_ADD_APPEND| keeps adding duplicates (invalid) even if present.
EXPECT_EQ(
1, X509_add1_ext_i2d(x509.get(), NID_basic_constraints, basic2_obj.get(),
/*crit=*/0, X509V3_ADD_APPEND));
expect_extensions({{NID_subject_key_identifier, true, skid2_der},
{NID_basic_constraints, true, basic1_der},
{NID_basic_constraints, false, basic2_der}});
// |X509V3_ADD_DELETE| only deletes one extension at a time.
EXPECT_EQ(1, X509_add1_ext_i2d(x509.get(), NID_basic_constraints, nullptr, 0,
X509V3_ADD_DELETE));
expect_extensions({{NID_subject_key_identifier, true, skid2_der},
{NID_basic_constraints, false, basic2_der}});
EXPECT_EQ(1, X509_add1_ext_i2d(x509.get(), NID_basic_constraints, nullptr, 0,
X509V3_ADD_DELETE));
expect_extensions({{NID_subject_key_identifier, true, skid2_der}});
}

4
crypto/x509v3/v3_lib.c
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@ -316,9 +316,11 @@ int X509V3_add1_i2d(STACK_OF(X509_EXTENSION) **x, int nid, void *value,
}
// If delete, just delete it
if (ext_op == X509V3_ADD_DELETE) {
if (!sk_X509_EXTENSION_delete(*x, extidx)) {
X509_EXTENSION *prev_ext = sk_X509_EXTENSION_delete(*x, extidx);
if (prev_ext == NULL) {
return -1;
}
X509_EXTENSION_free(prev_ext);
return 1;
}
} else {

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