Add function for writing list of certificates to a PEM file to ipalib.x509.

Also rename load_certificate_chain_from_file to
load_certificate_list_from_file.

Part of https://fedorahosted.org/freeipa/ticket/3259
Part of https://fedorahosted.org/freeipa/ticket/3520

Reviewed-By: Rob Crittenden <rcritten@redhat.com>

ipalib/x509.py

@@ -118,21 +118,6 @@ def load_certificate(data, datatype=PEM, dbdir=None):
 
     return nss.Certificate(buffer(data))
 
-def load_certificate_chain_from_file(filename, dbdir=None):
-    """
-    Load a certificate chain from a PEM file.
-
-    Returns a list of nss.Certificate objects.
-    """
-    fd = open(filename, 'r')
-    data = fd.read()
-    fd.close()
-
-    chain = PEM_REGEX.findall(data)
-    chain = [load_certificate(cert, PEM, dbdir) for cert in chain]
-
-    return chain
-
 def load_certificate_from_file(filename, dbdir=None):
     """
     Load a certificate from a PEM file.
@@ -145,6 +130,23 @@ def load_certificate_from_file(filename, dbdir=None):
 
     return load_certificate(data, PEM, dbdir)
 
+def load_certificate_list(data, dbdir=None):
+    certs = PEM_REGEX.findall(data)
+    certs = [load_certificate(cert, PEM, dbdir) for cert in certs]
+    return certs
+
+def load_certificate_list_from_file(filename, dbdir=None):
+    """
+    Load a certificate list from a PEM file.
+
+    Returns a list of nss.Certificate objects.
+    """
+    fd = open(filename, 'r')
+    data = fd.read()
+    fd.close()
+
+    return load_certificate_list(data, dbdir)
+
 def get_subject(certificate, datatype=PEM, dbdir=None):
     """
     Load an X509.3 certificate and get the subject.
@@ -310,6 +312,24 @@ def write_certificate(rawcert, filename):
     except (IOError, OSError), e:
         raise errors.FileError(reason=str(e))
 
+def write_certificate_list(rawcerts, filename):
+    """
+    Write a list of certificates to a file in PEM format.
+
+    The cert values can be either DER or PEM-encoded, they will be normalized
+    to DER regardless, then back out to PEM.
+    """
+    dercerts = [normalize_certificate(rawcert) for rawcert in rawcerts]
+
+    try:
+        with open(filename, 'w') as f:
+            for cert in dercerts:
+                cert = base64.b64encode(cert)
+                cert = make_pem(cert)
+                f.write(cert + '\n')
+    except (IOError, OSError), e:
+        raise errors.FileError(reason=str(e))
+
 def verify_cert_subject(ldap, hostname, dercert):
     """
     Verify that the certificate issuer we're adding matches the issuer

ipaserver/install/installutils.py

@@ -889,7 +889,7 @@ def validate_external_cert(cert_file, ca_file, subject_base):
 
     extchain = None
     try:
-        extchain = x509.load_certificate_chain_from_file(ca_file)
+        extchain = x509.load_certificate_list_from_file(ca_file)
         certdict = dict((DN(str(cert.subject)), DN(str(cert.issuer)))
                         for cert in extchain)
     except IOError, e:

ipaserver/install/ipa_cacert_manage.py

@@ -224,7 +224,7 @@ class CACertManage(admintool.AdminTool):
                 raise admintool.ScriptError(
                     "Not compatible with the current CA certificate: %s", e)
 
-            ca_certs = x509.load_certificate_chain_from_file(ca_filename)
+            ca_certs = x509.load_certificate_list_from_file(ca_filename)
             for ca_cert in ca_certs:
                 tmpdb.add_cert(ca_cert.der_data, str(ca_cert.subject), 'C,,')
             del ca_certs