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Add key usage to generated CA certificate

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Kovid Goyal 2024-08-16 15:43:33 +05:30
parent ee92957837
commit c278d6de5c
No known key found for this signature in database
GPG Key ID: 06BC317B515ACE7C
2 changed files with 26 additions and 7 deletions
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9
src/calibre/utils/certgen.c
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@ -110,14 +110,14 @@ add_ext(STACK_OF(X509_EXTENSION) *sk, int nid, const char *value, char *item_typ
static PyObject* create_rsa_cert_req(PyObject *self, PyObject *args) {
PyObject *capsule = NULL, *ans = NULL, *t = NULL;
X509_NAME *Name = NULL;
char *common_name = NULL, *country = NULL, *state = NULL, *locality = NULL, *org = NULL, *org_unit = NULL, *email = NULL, *basic_constraints = NULL;
char *common_name = NULL, *country = NULL, *state = NULL, *locality = NULL, *org = NULL, *org_unit = NULL, *email = NULL, *basic_constraints = NULL, *digital_key_usage = NULL;
X509_REQ *Cert = NULL;
PyObject *alt_names = NULL;
int ok = 0, signature_length = 0;
Py_ssize_t i = 0;
STACK_OF(X509_EXTENSION) *exts = NULL;
if(!PyArg_ParseTuple(args, "OO!szzzzzzz", &capsule, &PyTuple_Type, &alt_names, &common_name, &country, &state, &locality, &org, &org_unit, &email, &basic_constraints)) return NULL;
if(!PyArg_ParseTuple(args, "OO!szzzzzzzz", &capsule, &PyTuple_Type, &alt_names, &common_name, &country, &state, &locality, &org, &org_unit, &email, &basic_constraints, &digital_key_usage)) return NULL;
if(!PyCapsule_CheckExact(capsule)) return PyErr_Format(PyExc_TypeError, "The key is not a capsule object");
EVP_PKEY *KeyPair = PyCapsule_GetPointer(capsule, NULL);
if (!KeyPair) return PyErr_Format(PyExc_TypeError, "The key capsule is NULL");
@ -134,7 +134,7 @@ static PyObject* create_rsa_cert_req(PyObject *self, PyObject *args) {
if (!add_entry(Name, "emailAddress", email)) goto error;
if (!add_entry(Name, "CN", common_name)) goto error;
if (PyTuple_GET_SIZE(alt_names) > 0 || basic_constraints) {
if (PyTuple_GET_SIZE(alt_names) > 0 || basic_constraints || digital_key_usage) {
exts = sk_X509_EXTENSION_new_null();
if (!exts) { set_error("sk_X509_EXTENSION_new_null"); goto error; }
for (i = 0; i < PyTuple_GET_SIZE(alt_names); i++) {
@ -147,6 +147,9 @@ static PyObject* create_rsa_cert_req(PyObject *self, PyObject *args) {
if (basic_constraints) {
if(!add_ext(exts, NID_basic_constraints, basic_constraints, "basic_constraints")) goto error;
}
if (digital_key_usage) {
if(!add_ext(exts, NID_key_usage, digital_key_usage, "key_usage")) goto error;
}
X509_REQ_add_extensions(Cert, exts);
sk_X509_EXTENSION_pop_free(exts, X509_EXTENSION_free);
}

24
src/calibre/utils/certgen.py
View File

@ -16,11 +16,11 @@ def create_key_pair(size=2048):
def create_cert_request(
key_pair, common_name,
country='IN', state='Maharashtra', locality='Mumbai', organization=None,
organizational_unit=None, email_address=None, alt_names=(), basic_constraints=None
organizational_unit=None, email_address=None, alt_names=(), basic_constraints=None, digital_key_usage=None
):
return certgen.create_rsa_cert_req(
key_pair, tuple(alt_names), common_name,
country, state, locality, organization, organizational_unit, email_address, basic_constraints
country, state, locality, organization, organizational_unit, email_address, basic_constraints, digital_key_usage
)
@ -66,7 +66,7 @@ def create_server_cert(
# Create the Certificate Authority
cakey = create_key_pair(key_size)
careq = create_cert_request(cakey, ca_name, basic_constraints='CA:TRUE')
careq = create_cert_request(cakey, ca_name, basic_constraints='critical,CA:TRUE', digital_key_usage='critical,keyCertSign,cRLSign')
cacert = create_ca_cert(careq, cakey)
# Create the server certificate issued by the newly created CA
@ -91,10 +91,26 @@ def create_server_cert(
return cacert, cakey, cert, pkey
if __name__ == '__main__':
def develop():
import subprocess
import tempfile
cacert, cakey, cert, pkey = create_server_cert('test.me', alt_names=['DNS:moose.cat', 'DNS:huge.bat'])
print("CA Certificate")
print(cert_info(cacert))
print(), print(), print()
print('Server Certificate')
print(cert_info(cert))
with tempfile.NamedTemporaryFile(prefix='CA-', suffix='.pem') as cafile, tempfile.NamedTemporaryFile(prefix='Server-', suffix='.crt') as certfile:
cafile.write(serialize_cert(cacert).encode())
certfile.write(serialize_cert(cert).encode())
cafile.flush()
certfile.flush()
# Verify the self signed certificate
subprocess.check_call(['openssl', 'verify', '-verbose', '-x509_strict', '-CAfile', cafile.name, cafile.name])
# Verify the server certificate signed with the self signed certificate
raise SystemExit(subprocess.run([
'openssl', 'verify', '-show_chain', '-no_check_time', '-verbose', '-x509_strict', '-CAfile', cafile.name, certfile.name]).returncode)
if __name__ == '__main__':
develop()